fs/cifs/smb2ops.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  *  SMB2 version specific operations
0004  *
0005  *  Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>
0006  */
0007
0008 #include <linux/pagemap.h>
0009 #include <linux/vfs.h>
0010 #include <linux/falloc.h>
0011 #include <linux/scatterlist.h>
0012 #include <linux/uuid.h>
0013 #include <linux/sort.h>
0014 #include <crypto/aead.h>
0015 #include <linux/fiemap.h>
0016 #include <uapi/linux/magic.h>
0017 #include "cifsfs.h"
0018 #include "cifsglob.h"
0019 #include "smb2pdu.h"
0020 #include "smb2proto.h"
0021 #include "cifsproto.h"
0022 #include "cifs_debug.h"
0023 #include "cifs_unicode.h"
0024 #include "smb2status.h"
0025 #include "smb2glob.h"
0026 #include "cifs_ioctl.h"
0027 #include "smbdirect.h"
0028 #include "fscache.h"
0029 #include "fs_context.h"
0030 #include "cached_dir.h"
0031
0032 /* Change credits for different ops and return the total number of credits */
0033 static int
0034 change_conf(struct TCP_Server_Info *server)
0035 {
0036     server->credits += server->echo_credits + server->oplock_credits;
0037     server->oplock_credits = server->echo_credits = 0;
0038     switch (server->credits) {
0039     case 0:
0040         return 0;
0041     case 1:
0042         server->echoes = false;
0043         server->oplocks = false;
0044         break;
0045     case 2:
0046         server->echoes = true;
0047         server->oplocks = false;
0048         server->echo_credits = 1;
0049         break;
0050     default:
0051         server->echoes = true;
0052         if (enable_oplocks) {
0053             server->oplocks = true;
0054             server->oplock_credits = 1;
0055         } else
0056             server->oplocks = false;
0057
0058         server->echo_credits = 1;
0059     }
0060     server->credits -= server->echo_credits + server->oplock_credits;
0061     return server->credits + server->echo_credits + server->oplock_credits;
0062 }
0063
0064 static void
0065 smb2_add_credits(struct TCP_Server_Info *server,
0066          const struct cifs_credits *credits, const int optype)
0067 {
0068     int *val, rc = -1;
0069     int scredits, in_flight;
0070     unsigned int add = credits->value;
0071     unsigned int instance = credits->instance;
0072     bool reconnect_detected = false;
0073     bool reconnect_with_invalid_credits = false;
0074
0075     spin_lock(&server->req_lock);
0076     val = server->ops->get_credits_field(server, optype);
0077
0078     /* eg found case where write overlapping reconnect messed up credits */
0079     if (((optype & CIFS_OP_MASK) == CIFS_NEG_OP) && (*val != 0))
0080         reconnect_with_invalid_credits = true;
0081
0082     if ((instance == 0) || (instance == server->reconnect_instance))
0083         *val += add;
0084     else
0085         reconnect_detected = true;
0086
0087     if (*val > 65000) {
0088         *val = 65000; /* Don't get near 64K credits, avoid srv bugs */
0089         pr_warn_once("server overflowed SMB3 credits\n");
0090         trace_smb3_overflow_credits(server->CurrentMid,
0091                         server->conn_id, server->hostname, *val,
0092                         add, server->in_flight);
0093     }
0094     server->in_flight--;
0095     if (server->in_flight == 0 &&
0096        ((optype & CIFS_OP_MASK) != CIFS_NEG_OP) &&
0097        ((optype & CIFS_OP_MASK) != CIFS_SESS_OP))
0098         rc = change_conf(server);
0099     /*
0100      * Sometimes server returns 0 credits on oplock break ack - we need to
0101      * rebalance credits in this case.
0102      */
0103     else if (server->in_flight > 0 && server->oplock_credits == 0 &&
0104          server->oplocks) {
0105         if (server->credits > 1) {
0106             server->credits--;
0107             server->oplock_credits++;
0108         }
0109     }
0110     scredits = *val;
0111     in_flight = server->in_flight;
0112     spin_unlock(&server->req_lock);
0113     wake_up(&server->request_q);
0114
0115     if (reconnect_detected) {
0116         trace_smb3_reconnect_detected(server->CurrentMid,
0117             server->conn_id, server->hostname, scredits, add, in_flight);
0118
0119         cifs_dbg(FYI, "trying to put %d credits from the old server instance %d\n",
0120              add, instance);
0121     }
0122
0123     if (reconnect_with_invalid_credits) {
0124         trace_smb3_reconnect_with_invalid_credits(server->CurrentMid,
0125             server->conn_id, server->hostname, scredits, add, in_flight);
0126         cifs_dbg(FYI, "Negotiate operation when server credits is non-zero. Optype: %d, server credits: %d, credits added: %d\n",
0127              optype, scredits, add);
0128     }
0129
0130     spin_lock(&server->srv_lock);
0131     if (server->tcpStatus == CifsNeedReconnect
0132         || server->tcpStatus == CifsExiting) {
0133         spin_unlock(&server->srv_lock);
0134         return;
0135     }
0136     spin_unlock(&server->srv_lock);
0137
0138     switch (rc) {
0139     case -1:
0140         /* change_conf hasn't been executed */
0141         break;
0142     case 0:
0143         cifs_server_dbg(VFS, "Possible client or server bug - zero credits\n");
0144         break;
0145     case 1:
0146         cifs_server_dbg(VFS, "disabling echoes and oplocks\n");
0147         break;
0148     case 2:
0149         cifs_dbg(FYI, "disabling oplocks\n");
0150         break;
0151     default:
0152         /* change_conf rebalanced credits for different types */
0153         break;
0154     }
0155
0156     trace_smb3_add_credits(server->CurrentMid,
0157             server->conn_id, server->hostname, scredits, add, in_flight);
0158     cifs_dbg(FYI, "%s: added %u credits total=%d\n", __func__, add, scredits);
0159 }
0160
0161 static void
0162 smb2_set_credits(struct TCP_Server_Info *server, const int val)
0163 {
0164     int scredits, in_flight;
0165
0166     spin_lock(&server->req_lock);
0167     server->credits = val;
0168     if (val == 1)
0169         server->reconnect_instance++;
0170     scredits = server->credits;
0171     in_flight = server->in_flight;
0172     spin_unlock(&server->req_lock);
0173
0174     trace_smb3_set_credits(server->CurrentMid,
0175             server->conn_id, server->hostname, scredits, val, in_flight);
0176     cifs_dbg(FYI, "%s: set %u credits\n", __func__, val);
0177
0178     /* don't log while holding the lock */
0179     if (val == 1)
0180         cifs_dbg(FYI, "set credits to 1 due to smb2 reconnect\n");
0181 }
0182
0183 static int *
0184 smb2_get_credits_field(struct TCP_Server_Info *server, const int optype)
0185 {
0186     switch (optype) {
0187     case CIFS_ECHO_OP:
0188         return &server->echo_credits;
0189     case CIFS_OBREAK_OP:
0190         return &server->oplock_credits;
0191     default:
0192         return &server->credits;
0193     }
0194 }
0195
0196 static unsigned int
0197 smb2_get_credits(struct mid_q_entry *mid)
0198 {
0199     return mid->credits_received;
0200 }
0201
0202 static int
0203 smb2_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
0204               unsigned int *num, struct cifs_credits *credits)
0205 {
0206     int rc = 0;
0207     unsigned int scredits, in_flight;
0208
0209     spin_lock(&server->req_lock);
0210     while (1) {
0211         if (server->credits <= 0) {
0212             spin_unlock(&server->req_lock);
0213             cifs_num_waiters_inc(server);
0214             rc = wait_event_killable(server->request_q,
0215                 has_credits(server, &server->credits, 1));
0216             cifs_num_waiters_dec(server);
0217             if (rc)
0218                 return rc;
0219             spin_lock(&server->req_lock);
0220         } else {
0221             spin_unlock(&server->req_lock);
0222             spin_lock(&server->srv_lock);
0223             if (server->tcpStatus == CifsExiting) {
0224                 spin_unlock(&server->srv_lock);
0225                 return -ENOENT;
0226             }
0227             spin_unlock(&server->srv_lock);
0228
0229             spin_lock(&server->req_lock);
0230             scredits = server->credits;
0231             /* can deadlock with reopen */
0232             if (scredits <= 8) {
0233                 *num = SMB2_MAX_BUFFER_SIZE;
0234                 credits->value = 0;
0235                 credits->instance = 0;
0236                 break;
0237             }
0238
0239             /* leave some credits for reopen and other ops */
0240             scredits -= 8;
0241             *num = min_t(unsigned int, size,
0242                      scredits * SMB2_MAX_BUFFER_SIZE);
0243
0244             credits->value =
0245                 DIV_ROUND_UP(*num, SMB2_MAX_BUFFER_SIZE);
0246             credits->instance = server->reconnect_instance;
0247             server->credits -= credits->value;
0248             server->in_flight++;
0249             if (server->in_flight > server->max_in_flight)
0250                 server->max_in_flight = server->in_flight;
0251             break;
0252         }
0253     }
0254     scredits = server->credits;
0255     in_flight = server->in_flight;
0256     spin_unlock(&server->req_lock);
0257
0258     trace_smb3_wait_credits(server->CurrentMid,
0259             server->conn_id, server->hostname, scredits, -(credits->value), in_flight);
0260     cifs_dbg(FYI, "%s: removed %u credits total=%d\n",
0261             __func__, credits->value, scredits);
0262
0263     return rc;
0264 }
0265
0266 static int
0267 smb2_adjust_credits(struct TCP_Server_Info *server,
0268             struct cifs_credits *credits,
0269             const unsigned int payload_size)
0270 {
0271     int new_val = DIV_ROUND_UP(payload_size, SMB2_MAX_BUFFER_SIZE);
0272     int scredits, in_flight;
0273
0274     if (!credits->value || credits->value == new_val)
0275         return 0;
0276
0277     if (credits->value < new_val) {
0278         trace_smb3_too_many_credits(server->CurrentMid,
0279                 server->conn_id, server->hostname, 0, credits->value - new_val, 0);
0280         cifs_server_dbg(VFS, "request has less credits (%d) than required (%d)",
0281                 credits->value, new_val);
0282
0283         return -ENOTSUPP;
0284     }
0285
0286     spin_lock(&server->req_lock);
0287
0288     if (server->reconnect_instance != credits->instance) {
0289         scredits = server->credits;
0290         in_flight = server->in_flight;
0291         spin_unlock(&server->req_lock);
0292
0293         trace_smb3_reconnect_detected(server->CurrentMid,
0294             server->conn_id, server->hostname, scredits,
0295             credits->value - new_val, in_flight);
0296         cifs_server_dbg(VFS, "trying to return %d credits to old session\n",
0297              credits->value - new_val);
0298         return -EAGAIN;
0299     }
0300
0301     server->credits += credits->value - new_val;
0302     scredits = server->credits;
0303     in_flight = server->in_flight;
0304     spin_unlock(&server->req_lock);
0305     wake_up(&server->request_q);
0306
0307     trace_smb3_adj_credits(server->CurrentMid,
0308             server->conn_id, server->hostname, scredits,
0309             credits->value - new_val, in_flight);
0310     cifs_dbg(FYI, "%s: adjust added %u credits total=%d\n",
0311             __func__, credits->value - new_val, scredits);
0312
0313     credits->value = new_val;
0314
0315     return 0;
0316 }
0317
0318 static __u64
0319 smb2_get_next_mid(struct TCP_Server_Info *server)
0320 {
0321     __u64 mid;
0322     /* for SMB2 we need the current value */
0323     spin_lock(&server->mid_lock);
0324     mid = server->CurrentMid++;
0325     spin_unlock(&server->mid_lock);
0326     return mid;
0327 }
0328
0329 static void
0330 smb2_revert_current_mid(struct TCP_Server_Info *server, const unsigned int val)
0331 {
0332     spin_lock(&server->mid_lock);
0333     if (server->CurrentMid >= val)
0334         server->CurrentMid -= val;
0335     spin_unlock(&server->mid_lock);
0336 }
0337
0338 static struct mid_q_entry *
0339 __smb2_find_mid(struct TCP_Server_Info *server, char *buf, bool dequeue)
0340 {
0341     struct mid_q_entry *mid;
0342     struct smb2_hdr *shdr = (struct smb2_hdr *)buf;
0343     __u64 wire_mid = le64_to_cpu(shdr->MessageId);
0344
0345     if (shdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM) {
0346         cifs_server_dbg(VFS, "Encrypted frame parsing not supported yet\n");
0347         return NULL;
0348     }
0349
0350     spin_lock(&server->mid_lock);
0351     list_for_each_entry(mid, &server->pending_mid_q, qhead) {
0352         if ((mid->mid == wire_mid) &&
0353             (mid->mid_state == MID_REQUEST_SUBMITTED) &&
0354             (mid->command == shdr->Command)) {
0355             kref_get(&mid->refcount);
0356             if (dequeue) {
0357                 list_del_init(&mid->qhead);
0358                 mid->mid_flags |= MID_DELETED;
0359             }
0360             spin_unlock(&server->mid_lock);
0361             return mid;
0362         }
0363     }
0364     spin_unlock(&server->mid_lock);
0365     return NULL;
0366 }
0367
0368 static struct mid_q_entry *
0369 smb2_find_mid(struct TCP_Server_Info *server, char *buf)
0370 {
0371     return __smb2_find_mid(server, buf, false);
0372 }
0373
0374 static struct mid_q_entry *
0375 smb2_find_dequeue_mid(struct TCP_Server_Info *server, char *buf)
0376 {
0377     return __smb2_find_mid(server, buf, true);
0378 }
0379
0380 static void
0381 smb2_dump_detail(void *buf, struct TCP_Server_Info *server)
0382 {
0383 #ifdef CONFIG_CIFS_DEBUG2
0384     struct smb2_hdr *shdr = (struct smb2_hdr *)buf;
0385
0386     cifs_server_dbg(VFS, "Cmd: %d Err: 0x%x Flags: 0x%x Mid: %llu Pid: %d\n",
0387          shdr->Command, shdr->Status, shdr->Flags, shdr->MessageId,
0388          shdr->Id.SyncId.ProcessId);
0389     cifs_server_dbg(VFS, "smb buf %p len %u\n", buf,
0390          server->ops->calc_smb_size(buf));
0391 #endif
0392 }
0393
0394 static bool
0395 smb2_need_neg(struct TCP_Server_Info *server)
0396 {
0397     return server->max_read == 0;
0398 }
0399
0400 static int
0401 smb2_negotiate(const unsigned int xid,
0402            struct cifs_ses *ses,
0403            struct TCP_Server_Info *server)
0404 {
0405     int rc;
0406
0407     spin_lock(&server->mid_lock);
0408     server->CurrentMid = 0;
0409     spin_unlock(&server->mid_lock);
0410     rc = SMB2_negotiate(xid, ses, server);
0411     /* BB we probably don't need to retry with modern servers */
0412     if (rc == -EAGAIN)
0413         rc = -EHOSTDOWN;
0414     return rc;
0415 }
0416
0417 static unsigned int
0418 smb2_negotiate_wsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
0419 {
0420     struct TCP_Server_Info *server = tcon->ses->server;
0421     unsigned int wsize;
0422
0423     /* start with specified wsize, or default */
0424     wsize = ctx->wsize ? ctx->wsize : CIFS_DEFAULT_IOSIZE;
0425     wsize = min_t(unsigned int, wsize, server->max_write);
0426     if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
0427         wsize = min_t(unsigned int, wsize, SMB2_MAX_BUFFER_SIZE);
0428
0429     return wsize;
0430 }
0431
0432 static unsigned int
0433 smb3_negotiate_wsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
0434 {
0435     struct TCP_Server_Info *server = tcon->ses->server;
0436     unsigned int wsize;
0437
0438     /* start with specified wsize, or default */
0439     wsize = ctx->wsize ? ctx->wsize : SMB3_DEFAULT_IOSIZE;
0440     wsize = min_t(unsigned int, wsize, server->max_write);
0441 #ifdef CONFIG_CIFS_SMB_DIRECT
0442     if (server->rdma) {
0443         if (server->sign)
0444             /*
0445              * Account for SMB2 data transfer packet header and
0446              * possible encryption header
0447              */
0448             wsize = min_t(unsigned int,
0449                 wsize,
0450                 server->smbd_conn->max_fragmented_send_size -
0451                     SMB2_READWRITE_PDU_HEADER_SIZE -
0452                     sizeof(struct smb2_transform_hdr));
0453         else
0454             wsize = min_t(unsigned int,
0455                 wsize, server->smbd_conn->max_readwrite_size);
0456     }
0457 #endif
0458     if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
0459         wsize = min_t(unsigned int, wsize, SMB2_MAX_BUFFER_SIZE);
0460
0461     return wsize;
0462 }
0463
0464 static unsigned int
0465 smb2_negotiate_rsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
0466 {
0467     struct TCP_Server_Info *server = tcon->ses->server;
0468     unsigned int rsize;
0469
0470     /* start with specified rsize, or default */
0471     rsize = ctx->rsize ? ctx->rsize : CIFS_DEFAULT_IOSIZE;
0472     rsize = min_t(unsigned int, rsize, server->max_read);
0473
0474     if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
0475         rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE);
0476
0477     return rsize;
0478 }
0479
0480 static unsigned int
0481 smb3_negotiate_rsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
0482 {
0483     struct TCP_Server_Info *server = tcon->ses->server;
0484     unsigned int rsize;
0485
0486     /* start with specified rsize, or default */
0487     rsize = ctx->rsize ? ctx->rsize : SMB3_DEFAULT_IOSIZE;
0488     rsize = min_t(unsigned int, rsize, server->max_read);
0489 #ifdef CONFIG_CIFS_SMB_DIRECT
0490     if (server->rdma) {
0491         if (server->sign)
0492             /*
0493              * Account for SMB2 data transfer packet header and
0494              * possible encryption header
0495              */
0496             rsize = min_t(unsigned int,
0497                 rsize,
0498                 server->smbd_conn->max_fragmented_recv_size -
0499                     SMB2_READWRITE_PDU_HEADER_SIZE -
0500                     sizeof(struct smb2_transform_hdr));
0501         else
0502             rsize = min_t(unsigned int,
0503                 rsize, server->smbd_conn->max_readwrite_size);
0504     }
0505 #endif
0506
0507     if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
0508         rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE);
0509
0510     return rsize;
0511 }
0512
0513 static int
0514 parse_server_interfaces(struct network_interface_info_ioctl_rsp *buf,
0515             size_t buf_len,
0516             struct cifs_ses *ses)
0517 {
0518     struct network_interface_info_ioctl_rsp *p;
0519     struct sockaddr_in *addr4;
0520     struct sockaddr_in6 *addr6;
0521     struct iface_info_ipv4 *p4;
0522     struct iface_info_ipv6 *p6;
0523     struct cifs_server_iface *info = NULL, *iface = NULL, *niface = NULL;
0524     struct cifs_server_iface tmp_iface;
0525     ssize_t bytes_left;
0526     size_t next = 0;
0527     int nb_iface = 0;
0528     int rc = 0, ret = 0;
0529
0530     bytes_left = buf_len;
0531     p = buf;
0532
0533     spin_lock(&ses->iface_lock);
0534     /*
0535      * Go through iface_list and do kref_put to remove
0536      * any unused ifaces. ifaces in use will be removed
0537      * when the last user calls a kref_put on it
0538      */
0539     list_for_each_entry_safe(iface, niface, &ses->iface_list,
0540                  iface_head) {
0541         iface->is_active = 0;
0542         kref_put(&iface->refcount, release_iface);
0543     }
0544     spin_unlock(&ses->iface_lock);
0545
0546     while (bytes_left >= sizeof(*p)) {
0547         memset(&tmp_iface, 0, sizeof(tmp_iface));
0548         tmp_iface.speed = le64_to_cpu(p->LinkSpeed);
0549         tmp_iface.rdma_capable = le32_to_cpu(p->Capability & RDMA_CAPABLE) ? 1 : 0;
0550         tmp_iface.rss_capable = le32_to_cpu(p->Capability & RSS_CAPABLE) ? 1 : 0;
0551
0552         switch (p->Family) {
0553         /*
0554          * The kernel and wire socket structures have the same
0555          * layout and use network byte order but make the
0556          * conversion explicit in case either one changes.
0557          */
0558         case INTERNETWORK:
0559             addr4 = (struct sockaddr_in *)&tmp_iface.sockaddr;
0560             p4 = (struct iface_info_ipv4 *)p->Buffer;
0561             addr4->sin_family = AF_INET;
0562             memcpy(&addr4->sin_addr, &p4->IPv4Address, 4);
0563
0564             /* [MS-SMB2] 2.2.32.5.1.1 Clients MUST ignore these */
0565             addr4->sin_port = cpu_to_be16(CIFS_PORT);
0566
0567             cifs_dbg(FYI, "%s: ipv4 %pI4\n", __func__,
0568                  &addr4->sin_addr);
0569             break;
0570         case INTERNETWORKV6:
0571             addr6 = (struct sockaddr_in6 *)&tmp_iface.sockaddr;
0572             p6 = (struct iface_info_ipv6 *)p->Buffer;
0573             addr6->sin6_family = AF_INET6;
0574             memcpy(&addr6->sin6_addr, &p6->IPv6Address, 16);
0575
0576             /* [MS-SMB2] 2.2.32.5.1.2 Clients MUST ignore these */
0577             addr6->sin6_flowinfo = 0;
0578             addr6->sin6_scope_id = 0;
0579             addr6->sin6_port = cpu_to_be16(CIFS_PORT);
0580
0581             cifs_dbg(FYI, "%s: ipv6 %pI6\n", __func__,
0582                  &addr6->sin6_addr);
0583             break;
0584         default:
0585             cifs_dbg(VFS,
0586                  "%s: skipping unsupported socket family\n",
0587                  __func__);
0588             goto next_iface;
0589         }
0590
0591         /*
0592          * The iface_list is assumed to be sorted by speed.
0593          * Check if the new interface exists in that list.
0594          * NEVER change iface. it could be in use.
0595          * Add a new one instead
0596          */
0597         spin_lock(&ses->iface_lock);
0598         iface = niface = NULL;
0599         list_for_each_entry_safe(iface, niface, &ses->iface_list,
0600                      iface_head) {
0601             ret = iface_cmp(iface, &tmp_iface);
0602             if (!ret) {
0603                 /* just get a ref so that it doesn't get picked/freed */
0604                 iface->is_active = 1;
0605                 kref_get(&iface->refcount);
0606                 spin_unlock(&ses->iface_lock);
0607                 goto next_iface;
0608             } else if (ret < 0) {
0609                 /* all remaining ifaces are slower */
0610                 kref_get(&iface->refcount);
0611                 break;
0612             }
0613         }
0614         spin_unlock(&ses->iface_lock);
0615
0616         /* no match. insert the entry in the list */
0617         info = kmalloc(sizeof(struct cifs_server_iface),
0618                    GFP_KERNEL);
0619         if (!info) {
0620             rc = -ENOMEM;
0621             goto out;
0622         }
0623         memcpy(info, &tmp_iface, sizeof(tmp_iface));
0624
0625         /* add this new entry to the list */
0626         kref_init(&info->refcount);
0627         info->is_active = 1;
0628
0629         cifs_dbg(FYI, "%s: adding iface %zu\n", __func__, ses->iface_count);
0630         cifs_dbg(FYI, "%s: speed %zu bps\n", __func__, info->speed);
0631         cifs_dbg(FYI, "%s: capabilities 0x%08x\n", __func__,
0632              le32_to_cpu(p->Capability));
0633
0634         spin_lock(&ses->iface_lock);
0635         if (!list_entry_is_head(iface, &ses->iface_list, iface_head)) {
0636             list_add_tail(&info->iface_head, &iface->iface_head);
0637             kref_put(&iface->refcount, release_iface);
0638         } else
0639             list_add_tail(&info->iface_head, &ses->iface_list);
0640         spin_unlock(&ses->iface_lock);
0641
0642         ses->iface_count++;
0643         ses->iface_last_update = jiffies;
0644 next_iface:
0645         nb_iface++;
0646         next = le32_to_cpu(p->Next);
0647         if (!next) {
0648             bytes_left -= sizeof(*p);
0649             break;
0650         }
0651         p = (struct network_interface_info_ioctl_rsp *)((u8 *)p+next);
0652         bytes_left -= next;
0653     }
0654
0655     if (!nb_iface) {
0656         cifs_dbg(VFS, "%s: malformed interface info\n", __func__);
0657         rc = -EINVAL;
0658         goto out;
0659     }
0660
0661     /* Azure rounds the buffer size up 8, to a 16 byte boundary */
0662     if ((bytes_left > 8) || p->Next)
0663         cifs_dbg(VFS, "%s: incomplete interface info\n", __func__);
0664
0665
0666     if (!ses->iface_count) {
0667         rc = -EINVAL;
0668         goto out;
0669     }
0670
0671 out:
0672     return rc;
0673 }
0674
0675 int
0676 SMB3_request_interfaces(const unsigned int xid, struct cifs_tcon *tcon)
0677 {
0678     int rc;
0679     unsigned int ret_data_len = 0;
0680     struct network_interface_info_ioctl_rsp *out_buf = NULL;
0681     struct cifs_ses *ses = tcon->ses;
0682
0683     rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
0684             FSCTL_QUERY_NETWORK_INTERFACE_INFO,
0685             NULL /* no data input */, 0 /* no data input */,
0686             CIFSMaxBufSize, (char **)&out_buf, &ret_data_len);
0687     if (rc == -EOPNOTSUPP) {
0688         cifs_dbg(FYI,
0689              "server does not support query network interfaces\n");
0690         goto out;
0691     } else if (rc != 0) {
0692         cifs_tcon_dbg(VFS, "error %d on ioctl to get interface list\n", rc);
0693         goto out;
0694     }
0695
0696     rc = parse_server_interfaces(out_buf, ret_data_len, ses);
0697     if (rc)
0698         goto out;
0699
0700 out:
0701     kfree(out_buf);
0702     return rc;
0703 }
0704
0705 static void
0706 smb3_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon,
0707           struct cifs_sb_info *cifs_sb)
0708 {
0709     int rc;
0710     __le16 srch_path = 0; /* Null - open root of share */
0711     u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
0712     struct cifs_open_parms oparms;
0713     struct cifs_fid fid;
0714     struct cached_fid *cfid = NULL;
0715
0716     oparms.tcon = tcon;
0717     oparms.desired_access = FILE_READ_ATTRIBUTES;
0718     oparms.disposition = FILE_OPEN;
0719     oparms.create_options = cifs_create_options(cifs_sb, 0);
0720     oparms.fid = &fid;
0721     oparms.reconnect = false;
0722
0723     rc = open_cached_dir(xid, tcon, "", cifs_sb, false, &cfid);
0724     if (rc == 0)
0725         memcpy(&fid, &cfid->fid, sizeof(struct cifs_fid));
0726     else
0727         rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL,
0728                    NULL, NULL);
0729     if (rc)
0730         return;
0731
0732     SMB3_request_interfaces(xid, tcon);
0733
0734     SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
0735             FS_ATTRIBUTE_INFORMATION);
0736     SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
0737             FS_DEVICE_INFORMATION);
0738     SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
0739             FS_VOLUME_INFORMATION);
0740     SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
0741             FS_SECTOR_SIZE_INFORMATION); /* SMB3 specific */
0742     if (cfid == NULL)
0743         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
0744     else
0745         close_cached_dir(cfid);
0746 }
0747
0748 static void
0749 smb2_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon,
0750           struct cifs_sb_info *cifs_sb)
0751 {
0752     int rc;
0753     __le16 srch_path = 0; /* Null - open root of share */
0754     u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
0755     struct cifs_open_parms oparms;
0756     struct cifs_fid fid;
0757
0758     oparms.tcon = tcon;
0759     oparms.desired_access = FILE_READ_ATTRIBUTES;
0760     oparms.disposition = FILE_OPEN;
0761     oparms.create_options = cifs_create_options(cifs_sb, 0);
0762     oparms.fid = &fid;
0763     oparms.reconnect = false;
0764
0765     rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL,
0766                NULL, NULL);
0767     if (rc)
0768         return;
0769
0770     SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
0771             FS_ATTRIBUTE_INFORMATION);
0772     SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
0773             FS_DEVICE_INFORMATION);
0774     SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
0775 }
0776
0777 static int
0778 smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
0779             struct cifs_sb_info *cifs_sb, const char *full_path)
0780 {
0781     int rc;
0782     __le16 *utf16_path;
0783     __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
0784     struct cifs_open_parms oparms;
0785     struct cifs_fid fid;
0786     struct cached_fid *cfid;
0787
0788     rc = open_cached_dir(xid, tcon, full_path, cifs_sb, true, &cfid);
0789     if (!rc) {
0790         if (cfid->is_valid) {
0791             close_cached_dir(cfid);
0792             return 0;
0793         }
0794         close_cached_dir(cfid);
0795     }
0796
0797     utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
0798     if (!utf16_path)
0799         return -ENOMEM;
0800
0801     oparms.tcon = tcon;
0802     oparms.desired_access = FILE_READ_ATTRIBUTES;
0803     oparms.disposition = FILE_OPEN;
0804     oparms.create_options = cifs_create_options(cifs_sb, 0);
0805     oparms.fid = &fid;
0806     oparms.reconnect = false;
0807
0808     rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL,
0809                NULL);
0810     if (rc) {
0811         kfree(utf16_path);
0812         return rc;
0813     }
0814
0815     rc = SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
0816     kfree(utf16_path);
0817     return rc;
0818 }
0819
0820 static int
0821 smb2_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
0822           struct cifs_sb_info *cifs_sb, const char *full_path,
0823           u64 *uniqueid, FILE_ALL_INFO *data)
0824 {
0825     *uniqueid = le64_to_cpu(data->IndexNumber);
0826     return 0;
0827 }
0828
0829 static int
0830 smb2_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
0831              struct cifs_fid *fid, FILE_ALL_INFO *data)
0832 {
0833     int rc;
0834     struct smb2_file_all_info *smb2_data;
0835
0836     smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
0837                 GFP_KERNEL);
0838     if (smb2_data == NULL)
0839         return -ENOMEM;
0840
0841     rc = SMB2_query_info(xid, tcon, fid->persistent_fid, fid->volatile_fid,
0842                  smb2_data);
0843     if (!rc)
0844         move_smb2_info_to_cifs(data, smb2_data);
0845     kfree(smb2_data);
0846     return rc;
0847 }
0848
0849 #ifdef CONFIG_CIFS_XATTR
0850 static ssize_t
0851 move_smb2_ea_to_cifs(char *dst, size_t dst_size,
0852              struct smb2_file_full_ea_info *src, size_t src_size,
0853              const unsigned char *ea_name)
0854 {
0855     int rc = 0;
0856     unsigned int ea_name_len = ea_name ? strlen(ea_name) : 0;
0857     char *name, *value;
0858     size_t buf_size = dst_size;
0859     size_t name_len, value_len, user_name_len;
0860
0861     while (src_size > 0) {
0862         name_len = (size_t)src->ea_name_length;
0863         value_len = (size_t)le16_to_cpu(src->ea_value_length);
0864
0865         if (name_len == 0)
0866             break;
0867
0868         if (src_size < 8 + name_len + 1 + value_len) {
0869             cifs_dbg(FYI, "EA entry goes beyond length of list\n");
0870             rc = -EIO;
0871             goto out;
0872         }
0873
0874         name = &src->ea_data[0];
0875         value = &src->ea_data[src->ea_name_length + 1];
0876
0877         if (ea_name) {
0878             if (ea_name_len == name_len &&
0879                 memcmp(ea_name, name, name_len) == 0) {
0880                 rc = value_len;
0881                 if (dst_size == 0)
0882                     goto out;
0883                 if (dst_size < value_len) {
0884                     rc = -ERANGE;
0885                     goto out;
0886                 }
0887                 memcpy(dst, value, value_len);
0888                 goto out;
0889             }
0890         } else {
0891             /* 'user.' plus a terminating null */
0892             user_name_len = 5 + 1 + name_len;
0893
0894             if (buf_size == 0) {
0895                 /* skip copy - calc size only */
0896                 rc += user_name_len;
0897             } else if (dst_size >= user_name_len) {
0898                 dst_size -= user_name_len;
0899                 memcpy(dst, "user.", 5);
0900                 dst += 5;
0901                 memcpy(dst, src->ea_data, name_len);
0902                 dst += name_len;
0903                 *dst = 0;
0904                 ++dst;
0905                 rc += user_name_len;
0906             } else {
0907                 /* stop before overrun buffer */
0908                 rc = -ERANGE;
0909                 break;
0910             }
0911         }
0912
0913         if (!src->next_entry_offset)
0914             break;
0915
0916         if (src_size < le32_to_cpu(src->next_entry_offset)) {
0917             /* stop before overrun buffer */
0918             rc = -ERANGE;
0919             break;
0920         }
0921         src_size -= le32_to_cpu(src->next_entry_offset);
0922         src = (void *)((char *)src +
0923                    le32_to_cpu(src->next_entry_offset));
0924     }
0925
0926     /* didn't find the named attribute */
0927     if (ea_name)
0928         rc = -ENODATA;
0929
0930 out:
0931     return (ssize_t)rc;
0932 }
0933
0934 static ssize_t
0935 smb2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
0936            const unsigned char *path, const unsigned char *ea_name,
0937            char *ea_data, size_t buf_size,
0938            struct cifs_sb_info *cifs_sb)
0939 {
0940     int rc;
0941     struct kvec rsp_iov = {NULL, 0};
0942     int buftype = CIFS_NO_BUFFER;
0943     struct smb2_query_info_rsp *rsp;
0944     struct smb2_file_full_ea_info *info = NULL;
0945
0946     rc = smb2_query_info_compound(xid, tcon, path,
0947                       FILE_READ_EA,
0948                       FILE_FULL_EA_INFORMATION,
0949                       SMB2_O_INFO_FILE,
0950                       CIFSMaxBufSize -
0951                       MAX_SMB2_CREATE_RESPONSE_SIZE -
0952                       MAX_SMB2_CLOSE_RESPONSE_SIZE,
0953                       &rsp_iov, &buftype, cifs_sb);
0954     if (rc) {
0955         /*
0956          * If ea_name is NULL (listxattr) and there are no EAs,
0957          * return 0 as it's not an error. Otherwise, the specified
0958          * ea_name was not found.
0959          */
0960         if (!ea_name && rc == -ENODATA)
0961             rc = 0;
0962         goto qeas_exit;
0963     }
0964
0965     rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
0966     rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
0967                    le32_to_cpu(rsp->OutputBufferLength),
0968                    &rsp_iov,
0969                    sizeof(struct smb2_file_full_ea_info));
0970     if (rc)
0971         goto qeas_exit;
0972
0973     info = (struct smb2_file_full_ea_info *)(
0974             le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
0975     rc = move_smb2_ea_to_cifs(ea_data, buf_size, info,
0976             le32_to_cpu(rsp->OutputBufferLength), ea_name);
0977
0978  qeas_exit:
0979     free_rsp_buf(buftype, rsp_iov.iov_base);
0980     return rc;
0981 }
0982
0983
0984 static int
0985 smb2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
0986         const char *path, const char *ea_name, const void *ea_value,
0987         const __u16 ea_value_len, const struct nls_table *nls_codepage,
0988         struct cifs_sb_info *cifs_sb)
0989 {
0990     struct cifs_ses *ses = tcon->ses;
0991     struct TCP_Server_Info *server = cifs_pick_channel(ses);
0992     __le16 *utf16_path = NULL;
0993     int ea_name_len = strlen(ea_name);
0994     int flags = CIFS_CP_CREATE_CLOSE_OP;
0995     int len;
0996     struct smb_rqst rqst[3];
0997     int resp_buftype[3];
0998     struct kvec rsp_iov[3];
0999     struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
1000     struct cifs_open_parms oparms;
1001     __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1002     struct cifs_fid fid;
1003     struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE];
1004     unsigned int size[1];
1005     void *data[1];
1006     struct smb2_file_full_ea_info *ea = NULL;
1007     struct kvec close_iov[1];
1008     struct smb2_query_info_rsp *rsp;
1009     int rc, used_len = 0;
1010
1011     if (smb3_encryption_required(tcon))
1012         flags |= CIFS_TRANSFORM_REQ;
1013
1014     if (ea_name_len > 255)
1015         return -EINVAL;
1016
1017     utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
1018     if (!utf16_path)
1019         return -ENOMEM;
1020
1021     memset(rqst, 0, sizeof(rqst));
1022     resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
1023     memset(rsp_iov, 0, sizeof(rsp_iov));
1024
1025     if (ses->server->ops->query_all_EAs) {
1026         if (!ea_value) {
1027             rc = ses->server->ops->query_all_EAs(xid, tcon, path,
1028                                  ea_name, NULL, 0,
1029                                  cifs_sb);
1030             if (rc == -ENODATA)
1031                 goto sea_exit;
1032         } else {
1033             /* If we are adding a attribute we should first check
1034              * if there will be enough space available to store
1035              * the new EA. If not we should not add it since we
1036              * would not be able to even read the EAs back.
1037              */
1038             rc = smb2_query_info_compound(xid, tcon, path,
1039                       FILE_READ_EA,
1040                       FILE_FULL_EA_INFORMATION,
1041                       SMB2_O_INFO_FILE,
1042                       CIFSMaxBufSize -
1043                       MAX_SMB2_CREATE_RESPONSE_SIZE -
1044                       MAX_SMB2_CLOSE_RESPONSE_SIZE,
1045                       &rsp_iov[1], &resp_buftype[1], cifs_sb);
1046             if (rc == 0) {
1047                 rsp = (struct smb2_query_info_rsp *)rsp_iov[1].iov_base;
1048                 used_len = le32_to_cpu(rsp->OutputBufferLength);
1049             }
1050             free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
1051             resp_buftype[1] = CIFS_NO_BUFFER;
1052             memset(&rsp_iov[1], 0, sizeof(rsp_iov[1]));
1053             rc = 0;
1054
1055             /* Use a fudge factor of 256 bytes in case we collide
1056              * with a different set_EAs command.
1057              */
1058             if(CIFSMaxBufSize - MAX_SMB2_CREATE_RESPONSE_SIZE -
1059                MAX_SMB2_CLOSE_RESPONSE_SIZE - 256 <
1060                used_len + ea_name_len + ea_value_len + 1) {
1061                 rc = -ENOSPC;
1062                 goto sea_exit;
1063             }
1064         }
1065     }
1066
1067     /* Open */
1068     memset(&open_iov, 0, sizeof(open_iov));
1069     rqst[0].rq_iov = open_iov;
1070     rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
1071
1072     memset(&oparms, 0, sizeof(oparms));
1073     oparms.tcon = tcon;
1074     oparms.desired_access = FILE_WRITE_EA;
1075     oparms.disposition = FILE_OPEN;
1076     oparms.create_options = cifs_create_options(cifs_sb, 0);
1077     oparms.fid = &fid;
1078     oparms.reconnect = false;
1079
1080     rc = SMB2_open_init(tcon, server,
1081                 &rqst[0], &oplock, &oparms, utf16_path);
1082     if (rc)
1083         goto sea_exit;
1084     smb2_set_next_command(tcon, &rqst[0]);
1085
1086
1087     /* Set Info */
1088     memset(&si_iov, 0, sizeof(si_iov));
1089     rqst[1].rq_iov = si_iov;
1090     rqst[1].rq_nvec = 1;
1091
1092     len = sizeof(*ea) + ea_name_len + ea_value_len + 1;
1093     ea = kzalloc(len, GFP_KERNEL);
1094     if (ea == NULL) {
1095         rc = -ENOMEM;
1096         goto sea_exit;
1097     }
1098
1099     ea->ea_name_length = ea_name_len;
1100     ea->ea_value_length = cpu_to_le16(ea_value_len);
1101     memcpy(ea->ea_data, ea_name, ea_name_len + 1);
1102     memcpy(ea->ea_data + ea_name_len + 1, ea_value, ea_value_len);
1103
1104     size[0] = len;
1105     data[0] = ea;
1106
1107     rc = SMB2_set_info_init(tcon, server,
1108                 &rqst[1], COMPOUND_FID,
1109                 COMPOUND_FID, current->tgid,
1110                 FILE_FULL_EA_INFORMATION,
1111                 SMB2_O_INFO_FILE, 0, data, size);
1112     smb2_set_next_command(tcon, &rqst[1]);
1113     smb2_set_related(&rqst[1]);
1114
1115
1116     /* Close */
1117     memset(&close_iov, 0, sizeof(close_iov));
1118     rqst[2].rq_iov = close_iov;
1119     rqst[2].rq_nvec = 1;
1120     rc = SMB2_close_init(tcon, server,
1121                  &rqst[2], COMPOUND_FID, COMPOUND_FID, false);
1122     smb2_set_related(&rqst[2]);
1123
1124     rc = compound_send_recv(xid, ses, server,
1125                 flags, 3, rqst,
1126                 resp_buftype, rsp_iov);
1127     /* no need to bump num_remote_opens because handle immediately closed */
1128
1129  sea_exit:
1130     kfree(ea);
1131     kfree(utf16_path);
1132     SMB2_open_free(&rqst[0]);
1133     SMB2_set_info_free(&rqst[1]);
1134     SMB2_close_free(&rqst[2]);
1135     free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
1136     free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
1137     free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
1138     return rc;
1139 }
1140 #endif
1141
1142 static bool
1143 smb2_can_echo(struct TCP_Server_Info *server)
1144 {
1145     return server->echoes;
1146 }
1147
1148 static void
1149 smb2_clear_stats(struct cifs_tcon *tcon)
1150 {
1151     int i;
1152
1153     for (i = 0; i < NUMBER_OF_SMB2_COMMANDS; i++) {
1154         atomic_set(&tcon->stats.smb2_stats.smb2_com_sent[i], 0);
1155         atomic_set(&tcon->stats.smb2_stats.smb2_com_failed[i], 0);
1156     }
1157 }
1158
1159 static void
1160 smb2_dump_share_caps(struct seq_file *m, struct cifs_tcon *tcon)
1161 {
1162     seq_puts(m, "\n\tShare Capabilities:");
1163     if (tcon->capabilities & SMB2_SHARE_CAP_DFS)
1164         seq_puts(m, " DFS,");
1165     if (tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
1166         seq_puts(m, " CONTINUOUS AVAILABILITY,");
1167     if (tcon->capabilities & SMB2_SHARE_CAP_SCALEOUT)
1168         seq_puts(m, " SCALEOUT,");
1169     if (tcon->capabilities & SMB2_SHARE_CAP_CLUSTER)
1170         seq_puts(m, " CLUSTER,");
1171     if (tcon->capabilities & SMB2_SHARE_CAP_ASYMMETRIC)
1172         seq_puts(m, " ASYMMETRIC,");
1173     if (tcon->capabilities == 0)
1174         seq_puts(m, " None");
1175     if (tcon->ss_flags & SSINFO_FLAGS_ALIGNED_DEVICE)
1176         seq_puts(m, " Aligned,");
1177     if (tcon->ss_flags & SSINFO_FLAGS_PARTITION_ALIGNED_ON_DEVICE)
1178         seq_puts(m, " Partition Aligned,");
1179     if (tcon->ss_flags & SSINFO_FLAGS_NO_SEEK_PENALTY)
1180         seq_puts(m, " SSD,");
1181     if (tcon->ss_flags & SSINFO_FLAGS_TRIM_ENABLED)
1182         seq_puts(m, " TRIM-support,");
1183
1184     seq_printf(m, "\tShare Flags: 0x%x", tcon->share_flags);
1185     seq_printf(m, "\n\ttid: 0x%x", tcon->tid);
1186     if (tcon->perf_sector_size)
1187         seq_printf(m, "\tOptimal sector size: 0x%x",
1188                tcon->perf_sector_size);
1189     seq_printf(m, "\tMaximal Access: 0x%x", tcon->maximal_access);
1190 }
1191
1192 static void
1193 smb2_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
1194 {
1195     atomic_t *sent = tcon->stats.smb2_stats.smb2_com_sent;
1196     atomic_t *failed = tcon->stats.smb2_stats.smb2_com_failed;
1197
1198     /*
1199      *  Can't display SMB2_NEGOTIATE, SESSION_SETUP, LOGOFF, CANCEL and ECHO
1200      *  totals (requests sent) since those SMBs are per-session not per tcon
1201      */
1202     seq_printf(m, "\nBytes read: %llu  Bytes written: %llu",
1203            (long long)(tcon->bytes_read),
1204            (long long)(tcon->bytes_written));
1205     seq_printf(m, "\nOpen files: %d total (local), %d open on server",
1206            atomic_read(&tcon->num_local_opens),
1207            atomic_read(&tcon->num_remote_opens));
1208     seq_printf(m, "\nTreeConnects: %d total %d failed",
1209            atomic_read(&sent[SMB2_TREE_CONNECT_HE]),
1210            atomic_read(&failed[SMB2_TREE_CONNECT_HE]));
1211     seq_printf(m, "\nTreeDisconnects: %d total %d failed",
1212            atomic_read(&sent[SMB2_TREE_DISCONNECT_HE]),
1213            atomic_read(&failed[SMB2_TREE_DISCONNECT_HE]));
1214     seq_printf(m, "\nCreates: %d total %d failed",
1215            atomic_read(&sent[SMB2_CREATE_HE]),
1216            atomic_read(&failed[SMB2_CREATE_HE]));
1217     seq_printf(m, "\nCloses: %d total %d failed",
1218            atomic_read(&sent[SMB2_CLOSE_HE]),
1219            atomic_read(&failed[SMB2_CLOSE_HE]));
1220     seq_printf(m, "\nFlushes: %d total %d failed",
1221            atomic_read(&sent[SMB2_FLUSH_HE]),
1222            atomic_read(&failed[SMB2_FLUSH_HE]));
1223     seq_printf(m, "\nReads: %d total %d failed",
1224            atomic_read(&sent[SMB2_READ_HE]),
1225            atomic_read(&failed[SMB2_READ_HE]));
1226     seq_printf(m, "\nWrites: %d total %d failed",
1227            atomic_read(&sent[SMB2_WRITE_HE]),
1228            atomic_read(&failed[SMB2_WRITE_HE]));
1229     seq_printf(m, "\nLocks: %d total %d failed",
1230            atomic_read(&sent[SMB2_LOCK_HE]),
1231            atomic_read(&failed[SMB2_LOCK_HE]));
1232     seq_printf(m, "\nIOCTLs: %d total %d failed",
1233            atomic_read(&sent[SMB2_IOCTL_HE]),
1234            atomic_read(&failed[SMB2_IOCTL_HE]));
1235     seq_printf(m, "\nQueryDirectories: %d total %d failed",
1236            atomic_read(&sent[SMB2_QUERY_DIRECTORY_HE]),
1237            atomic_read(&failed[SMB2_QUERY_DIRECTORY_HE]));
1238     seq_printf(m, "\nChangeNotifies: %d total %d failed",
1239            atomic_read(&sent[SMB2_CHANGE_NOTIFY_HE]),
1240            atomic_read(&failed[SMB2_CHANGE_NOTIFY_HE]));
1241     seq_printf(m, "\nQueryInfos: %d total %d failed",
1242            atomic_read(&sent[SMB2_QUERY_INFO_HE]),
1243            atomic_read(&failed[SMB2_QUERY_INFO_HE]));
1244     seq_printf(m, "\nSetInfos: %d total %d failed",
1245            atomic_read(&sent[SMB2_SET_INFO_HE]),
1246            atomic_read(&failed[SMB2_SET_INFO_HE]));
1247     seq_printf(m, "\nOplockBreaks: %d sent %d failed",
1248            atomic_read(&sent[SMB2_OPLOCK_BREAK_HE]),
1249            atomic_read(&failed[SMB2_OPLOCK_BREAK_HE]));
1250 }
1251
1252 static void
1253 smb2_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
1254 {
1255     struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
1256     struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
1257
1258     cfile->fid.persistent_fid = fid->persistent_fid;
1259     cfile->fid.volatile_fid = fid->volatile_fid;
1260     cfile->fid.access = fid->access;
1261 #ifdef CONFIG_CIFS_DEBUG2
1262     cfile->fid.mid = fid->mid;
1263 #endif /* CIFS_DEBUG2 */
1264     server->ops->set_oplock_level(cinode, oplock, fid->epoch,
1265                       &fid->purge_cache);
1266     cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode);
1267     memcpy(cfile->fid.create_guid, fid->create_guid, 16);
1268 }
1269
1270 static void
1271 smb2_close_file(const unsigned int xid, struct cifs_tcon *tcon,
1272         struct cifs_fid *fid)
1273 {
1274     SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
1275 }
1276
1277 static void
1278 smb2_close_getattr(const unsigned int xid, struct cifs_tcon *tcon,
1279            struct cifsFileInfo *cfile)
1280 {
1281     struct smb2_file_network_open_info file_inf;
1282     struct inode *inode;
1283     int rc;
1284
1285     rc = __SMB2_close(xid, tcon, cfile->fid.persistent_fid,
1286            cfile->fid.volatile_fid, &file_inf);
1287     if (rc)
1288         return;
1289
1290     inode = d_inode(cfile->dentry);
1291
1292     spin_lock(&inode->i_lock);
1293     CIFS_I(inode)->time = jiffies;
1294
1295     /* Creation time should not need to be updated on close */
1296     if (file_inf.LastWriteTime)
1297         inode->i_mtime = cifs_NTtimeToUnix(file_inf.LastWriteTime);
1298     if (file_inf.ChangeTime)
1299         inode->i_ctime = cifs_NTtimeToUnix(file_inf.ChangeTime);
1300     if (file_inf.LastAccessTime)
1301         inode->i_atime = cifs_NTtimeToUnix(file_inf.LastAccessTime);
1302
1303     /*
1304      * i_blocks is not related to (i_size / i_blksize),
1305      * but instead 512 byte (2**9) size is required for
1306      * calculating num blocks.
1307      */
1308     if (le64_to_cpu(file_inf.AllocationSize) > 4096)
1309         inode->i_blocks =
1310             (512 - 1 + le64_to_cpu(file_inf.AllocationSize)) >> 9;
1311
1312     /* End of file and Attributes should not have to be updated on close */
1313     spin_unlock(&inode->i_lock);
1314 }
1315
1316 static int
1317 SMB2_request_res_key(const unsigned int xid, struct cifs_tcon *tcon,
1318              u64 persistent_fid, u64 volatile_fid,
1319              struct copychunk_ioctl *pcchunk)
1320 {
1321     int rc;
1322     unsigned int ret_data_len;
1323     struct resume_key_req *res_key;
1324
1325     rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
1326             FSCTL_SRV_REQUEST_RESUME_KEY, NULL, 0 /* no input */,
1327             CIFSMaxBufSize, (char **)&res_key, &ret_data_len);
1328
1329     if (rc == -EOPNOTSUPP) {
1330         pr_warn_once("Server share %s does not support copy range\n", tcon->treeName);
1331         goto req_res_key_exit;
1332     } else if (rc) {
1333         cifs_tcon_dbg(VFS, "refcpy ioctl error %d getting resume key\n", rc);
1334         goto req_res_key_exit;
1335     }
1336     if (ret_data_len < sizeof(struct resume_key_req)) {
1337         cifs_tcon_dbg(VFS, "Invalid refcopy resume key length\n");
1338         rc = -EINVAL;
1339         goto req_res_key_exit;
1340     }
1341     memcpy(pcchunk->SourceKey, res_key->ResumeKey, COPY_CHUNK_RES_KEY_SIZE);
1342
1343 req_res_key_exit:
1344     kfree(res_key);
1345     return rc;
1346 }
1347
1348 struct iqi_vars {
1349     struct smb_rqst rqst[3];
1350     struct kvec rsp_iov[3];
1351     struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
1352     struct kvec qi_iov[1];
1353     struct kvec io_iov[SMB2_IOCTL_IOV_SIZE];
1354     struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE];
1355     struct kvec close_iov[1];
1356 };
1357
1358 static int
1359 smb2_ioctl_query_info(const unsigned int xid,
1360               struct cifs_tcon *tcon,
1361               struct cifs_sb_info *cifs_sb,
1362               __le16 *path, int is_dir,
1363               unsigned long p)
1364 {
1365     struct iqi_vars *vars;
1366     struct smb_rqst *rqst;
1367     struct kvec *rsp_iov;
1368     struct cifs_ses *ses = tcon->ses;
1369     struct TCP_Server_Info *server = cifs_pick_channel(ses);
1370     char __user *arg = (char __user *)p;
1371     struct smb_query_info qi;
1372     struct smb_query_info __user *pqi;
1373     int rc = 0;
1374     int flags = CIFS_CP_CREATE_CLOSE_OP;
1375     struct smb2_query_info_rsp *qi_rsp = NULL;
1376     struct smb2_ioctl_rsp *io_rsp = NULL;
1377     void *buffer = NULL;
1378     int resp_buftype[3];
1379     struct cifs_open_parms oparms;
1380     u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1381     struct cifs_fid fid;
1382     unsigned int size[2];
1383     void *data[2];
1384     int create_options = is_dir ? CREATE_NOT_FILE : CREATE_NOT_DIR;
1385     void (*free_req1_func)(struct smb_rqst *r);
1386
1387     vars = kzalloc(sizeof(*vars), GFP_ATOMIC);
1388     if (vars == NULL)
1389         return -ENOMEM;
1390     rqst = &vars->rqst[0];
1391     rsp_iov = &vars->rsp_iov[0];
1392
1393     resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
1394
1395     if (copy_from_user(&qi, arg, sizeof(struct smb_query_info))) {
1396         rc = -EFAULT;
1397         goto free_vars;
1398     }
1399     if (qi.output_buffer_length > 1024) {
1400         rc = -EINVAL;
1401         goto free_vars;
1402     }
1403
1404     if (!ses || !server) {
1405         rc = -EIO;
1406         goto free_vars;
1407     }
1408
1409     if (smb3_encryption_required(tcon))
1410         flags |= CIFS_TRANSFORM_REQ;
1411
1412     if (qi.output_buffer_length) {
1413         buffer = memdup_user(arg + sizeof(struct smb_query_info), qi.output_buffer_length);
1414         if (IS_ERR(buffer)) {
1415             rc = PTR_ERR(buffer);
1416             goto free_vars;
1417         }
1418     }
1419
1420     /* Open */
1421     rqst[0].rq_iov = &vars->open_iov[0];
1422     rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
1423
1424     memset(&oparms, 0, sizeof(oparms));
1425     oparms.tcon = tcon;
1426     oparms.disposition = FILE_OPEN;
1427     oparms.create_options = cifs_create_options(cifs_sb, create_options);
1428     oparms.fid = &fid;
1429     oparms.reconnect = false;
1430
1431     if (qi.flags & PASSTHRU_FSCTL) {
1432         switch (qi.info_type & FSCTL_DEVICE_ACCESS_MASK) {
1433         case FSCTL_DEVICE_ACCESS_FILE_READ_WRITE_ACCESS:
1434             oparms.desired_access = FILE_READ_DATA | FILE_WRITE_DATA | FILE_READ_ATTRIBUTES | SYNCHRONIZE;
1435             break;
1436         case FSCTL_DEVICE_ACCESS_FILE_ANY_ACCESS:
1437             oparms.desired_access = GENERIC_ALL;
1438             break;
1439         case FSCTL_DEVICE_ACCESS_FILE_READ_ACCESS:
1440             oparms.desired_access = GENERIC_READ;
1441             break;
1442         case FSCTL_DEVICE_ACCESS_FILE_WRITE_ACCESS:
1443             oparms.desired_access = GENERIC_WRITE;
1444             break;
1445         }
1446     } else if (qi.flags & PASSTHRU_SET_INFO) {
1447         oparms.desired_access = GENERIC_WRITE;
1448     } else {
1449         oparms.desired_access = FILE_READ_ATTRIBUTES | READ_CONTROL;
1450     }
1451
1452     rc = SMB2_open_init(tcon, server,
1453                 &rqst[0], &oplock, &oparms, path);
1454     if (rc)
1455         goto free_output_buffer;
1456     smb2_set_next_command(tcon, &rqst[0]);
1457
1458     /* Query */
1459     if (qi.flags & PASSTHRU_FSCTL) {
1460         /* Can eventually relax perm check since server enforces too */
1461         if (!capable(CAP_SYS_ADMIN)) {
1462             rc = -EPERM;
1463             goto free_open_req;
1464         }
1465         rqst[1].rq_iov = &vars->io_iov[0];
1466         rqst[1].rq_nvec = SMB2_IOCTL_IOV_SIZE;
1467
1468         rc = SMB2_ioctl_init(tcon, server, &rqst[1], COMPOUND_FID, COMPOUND_FID,
1469                      qi.info_type, buffer, qi.output_buffer_length,
1470                      CIFSMaxBufSize - MAX_SMB2_CREATE_RESPONSE_SIZE -
1471                      MAX_SMB2_CLOSE_RESPONSE_SIZE);
1472         free_req1_func = SMB2_ioctl_free;
1473     } else if (qi.flags == PASSTHRU_SET_INFO) {
1474         /* Can eventually relax perm check since server enforces too */
1475         if (!capable(CAP_SYS_ADMIN)) {
1476             rc = -EPERM;
1477             goto free_open_req;
1478         }
1479         if (qi.output_buffer_length < 8) {
1480             rc = -EINVAL;
1481             goto free_open_req;
1482         }
1483         rqst[1].rq_iov = &vars->si_iov[0];
1484         rqst[1].rq_nvec = 1;
1485
1486         /* MS-FSCC 2.4.13 FileEndOfFileInformation */
1487         size[0] = 8;
1488         data[0] = buffer;
1489
1490         rc = SMB2_set_info_init(tcon, server, &rqst[1], COMPOUND_FID, COMPOUND_FID,
1491                     current->tgid, FILE_END_OF_FILE_INFORMATION,
1492                     SMB2_O_INFO_FILE, 0, data, size);
1493         free_req1_func = SMB2_set_info_free;
1494     } else if (qi.flags == PASSTHRU_QUERY_INFO) {
1495         rqst[1].rq_iov = &vars->qi_iov[0];
1496         rqst[1].rq_nvec = 1;
1497
1498         rc = SMB2_query_info_init(tcon, server,
1499                   &rqst[1], COMPOUND_FID,
1500                   COMPOUND_FID, qi.file_info_class,
1501                   qi.info_type, qi.additional_information,
1502                   qi.input_buffer_length,
1503                   qi.output_buffer_length, buffer);
1504         free_req1_func = SMB2_query_info_free;
1505     } else { /* unknown flags */
1506         cifs_tcon_dbg(VFS, "Invalid passthru query flags: 0x%x\n",
1507                   qi.flags);
1508         rc = -EINVAL;
1509     }
1510
1511     if (rc)
1512         goto free_open_req;
1513     smb2_set_next_command(tcon, &rqst[1]);
1514     smb2_set_related(&rqst[1]);
1515
1516     /* Close */
1517     rqst[2].rq_iov = &vars->close_iov[0];
1518     rqst[2].rq_nvec = 1;
1519
1520     rc = SMB2_close_init(tcon, server,
1521                  &rqst[2], COMPOUND_FID, COMPOUND_FID, false);
1522     if (rc)
1523         goto free_req_1;
1524     smb2_set_related(&rqst[2]);
1525
1526     rc = compound_send_recv(xid, ses, server,
1527                 flags, 3, rqst,
1528                 resp_buftype, rsp_iov);
1529     if (rc)
1530         goto out;
1531
1532     /* No need to bump num_remote_opens since handle immediately closed */
1533     if (qi.flags & PASSTHRU_FSCTL) {
1534         pqi = (struct smb_query_info __user *)arg;
1535         io_rsp = (struct smb2_ioctl_rsp *)rsp_iov[1].iov_base;
1536         if (le32_to_cpu(io_rsp->OutputCount) < qi.input_buffer_length)
1537             qi.input_buffer_length = le32_to_cpu(io_rsp->OutputCount);
1538         if (qi.input_buffer_length > 0 &&
1539             le32_to_cpu(io_rsp->OutputOffset) + qi.input_buffer_length
1540             > rsp_iov[1].iov_len) {
1541             rc = -EFAULT;
1542             goto out;
1543         }
1544
1545         if (copy_to_user(&pqi->input_buffer_length,
1546                  &qi.input_buffer_length,
1547                  sizeof(qi.input_buffer_length))) {
1548             rc = -EFAULT;
1549             goto out;
1550         }
1551
1552         if (copy_to_user((void __user *)pqi + sizeof(struct smb_query_info),
1553                  (const void *)io_rsp + le32_to_cpu(io_rsp->OutputOffset),
1554                  qi.input_buffer_length))
1555             rc = -EFAULT;
1556     } else {
1557         pqi = (struct smb_query_info __user *)arg;
1558         qi_rsp = (struct smb2_query_info_rsp *)rsp_iov[1].iov_base;
1559         if (le32_to_cpu(qi_rsp->OutputBufferLength) < qi.input_buffer_length)
1560             qi.input_buffer_length = le32_to_cpu(qi_rsp->OutputBufferLength);
1561         if (copy_to_user(&pqi->input_buffer_length,
1562                  &qi.input_buffer_length,
1563                  sizeof(qi.input_buffer_length))) {
1564             rc = -EFAULT;
1565             goto out;
1566         }
1567
1568         if (copy_to_user(pqi + 1, qi_rsp->Buffer,
1569                  qi.input_buffer_length))
1570             rc = -EFAULT;
1571     }
1572
1573 out:
1574     free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
1575     free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
1576     free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
1577     SMB2_close_free(&rqst[2]);
1578 free_req_1:
1579     free_req1_func(&rqst[1]);
1580 free_open_req:
1581     SMB2_open_free(&rqst[0]);
1582 free_output_buffer:
1583     kfree(buffer);
1584 free_vars:
1585     kfree(vars);
1586     return rc;
1587 }
1588
1589 static ssize_t
1590 smb2_copychunk_range(const unsigned int xid,
1591             struct cifsFileInfo *srcfile,
1592             struct cifsFileInfo *trgtfile, u64 src_off,
1593             u64 len, u64 dest_off)
1594 {
1595     int rc;
1596     unsigned int ret_data_len;
1597     struct copychunk_ioctl *pcchunk;
1598     struct copychunk_ioctl_rsp *retbuf = NULL;
1599     struct cifs_tcon *tcon;
1600     int chunks_copied = 0;
1601     bool chunk_sizes_updated = false;
1602     ssize_t bytes_written, total_bytes_written = 0;
1603
1604     pcchunk = kmalloc(sizeof(struct copychunk_ioctl), GFP_KERNEL);
1605     if (pcchunk == NULL)
1606         return -ENOMEM;
1607
1608     cifs_dbg(FYI, "%s: about to call request res key\n", __func__);
1609     /* Request a key from the server to identify the source of the copy */
1610     rc = SMB2_request_res_key(xid, tlink_tcon(srcfile->tlink),
1611                 srcfile->fid.persistent_fid,
1612                 srcfile->fid.volatile_fid, pcchunk);
1613
1614     /* Note: request_res_key sets res_key null only if rc !=0 */
1615     if (rc)
1616         goto cchunk_out;
1617
1618     /* For now array only one chunk long, will make more flexible later */
1619     pcchunk->ChunkCount = cpu_to_le32(1);
1620     pcchunk->Reserved = 0;
1621     pcchunk->Reserved2 = 0;
1622
1623     tcon = tlink_tcon(trgtfile->tlink);
1624
1625     while (len > 0) {
1626         pcchunk->SourceOffset = cpu_to_le64(src_off);
1627         pcchunk->TargetOffset = cpu_to_le64(dest_off);
1628         pcchunk->Length =
1629             cpu_to_le32(min_t(u32, len, tcon->max_bytes_chunk));
1630
1631         /* Request server copy to target from src identified by key */
1632         kfree(retbuf);
1633         retbuf = NULL;
1634         rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
1635             trgtfile->fid.volatile_fid, FSCTL_SRV_COPYCHUNK_WRITE,
1636             (char *)pcchunk, sizeof(struct copychunk_ioctl),
1637             CIFSMaxBufSize, (char **)&retbuf, &ret_data_len);
1638         if (rc == 0) {
1639             if (ret_data_len !=
1640                     sizeof(struct copychunk_ioctl_rsp)) {
1641                 cifs_tcon_dbg(VFS, "Invalid cchunk response size\n");
1642                 rc = -EIO;
1643                 goto cchunk_out;
1644             }
1645             if (retbuf->TotalBytesWritten == 0) {
1646                 cifs_dbg(FYI, "no bytes copied\n");
1647                 rc = -EIO;
1648                 goto cchunk_out;
1649             }
1650             /*
1651              * Check if server claimed to write more than we asked
1652              */
1653             if (le32_to_cpu(retbuf->TotalBytesWritten) >
1654                 le32_to_cpu(pcchunk->Length)) {
1655                 cifs_tcon_dbg(VFS, "Invalid copy chunk response\n");
1656                 rc = -EIO;
1657                 goto cchunk_out;
1658             }
1659             if (le32_to_cpu(retbuf->ChunksWritten) != 1) {
1660                 cifs_tcon_dbg(VFS, "Invalid num chunks written\n");
1661                 rc = -EIO;
1662                 goto cchunk_out;
1663             }
1664             chunks_copied++;
1665
1666             bytes_written = le32_to_cpu(retbuf->TotalBytesWritten);
1667             src_off += bytes_written;
1668             dest_off += bytes_written;
1669             len -= bytes_written;
1670             total_bytes_written += bytes_written;
1671
1672             cifs_dbg(FYI, "Chunks %d PartialChunk %d Total %zu\n",
1673                 le32_to_cpu(retbuf->ChunksWritten),
1674                 le32_to_cpu(retbuf->ChunkBytesWritten),
1675                 bytes_written);
1676         } else if (rc == -EINVAL) {
1677             if (ret_data_len != sizeof(struct copychunk_ioctl_rsp))
1678                 goto cchunk_out;
1679
1680             cifs_dbg(FYI, "MaxChunks %d BytesChunk %d MaxCopy %d\n",
1681                 le32_to_cpu(retbuf->ChunksWritten),
1682                 le32_to_cpu(retbuf->ChunkBytesWritten),
1683                 le32_to_cpu(retbuf->TotalBytesWritten));
1684
1685             /*
1686              * Check if this is the first request using these sizes,
1687              * (ie check if copy succeed once with original sizes
1688              * and check if the server gave us different sizes after
1689              * we already updated max sizes on previous request).
1690              * if not then why is the server returning an error now
1691              */
1692             if ((chunks_copied != 0) || chunk_sizes_updated)
1693                 goto cchunk_out;
1694
1695             /* Check that server is not asking us to grow size */
1696             if (le32_to_cpu(retbuf->ChunkBytesWritten) <
1697                     tcon->max_bytes_chunk)
1698                 tcon->max_bytes_chunk =
1699                     le32_to_cpu(retbuf->ChunkBytesWritten);
1700             else
1701                 goto cchunk_out; /* server gave us bogus size */
1702
1703             /* No need to change MaxChunks since already set to 1 */
1704             chunk_sizes_updated = true;
1705         } else
1706             goto cchunk_out;
1707     }
1708
1709 cchunk_out:
1710     kfree(pcchunk);
1711     kfree(retbuf);
1712     if (rc)
1713         return rc;
1714     else
1715         return total_bytes_written;
1716 }
1717
1718 static int
1719 smb2_flush_file(const unsigned int xid, struct cifs_tcon *tcon,
1720         struct cifs_fid *fid)
1721 {
1722     return SMB2_flush(xid, tcon, fid->persistent_fid, fid->volatile_fid);
1723 }
1724
1725 static unsigned int
1726 smb2_read_data_offset(char *buf)
1727 {
1728     struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
1729
1730     return rsp->DataOffset;
1731 }
1732
1733 static unsigned int
1734 smb2_read_data_length(char *buf, bool in_remaining)
1735 {
1736     struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
1737
1738     if (in_remaining)
1739         return le32_to_cpu(rsp->DataRemaining);
1740
1741     return le32_to_cpu(rsp->DataLength);
1742 }
1743
1744
1745 static int
1746 smb2_sync_read(const unsigned int xid, struct cifs_fid *pfid,
1747            struct cifs_io_parms *parms, unsigned int *bytes_read,
1748            char **buf, int *buf_type)
1749 {
1750     parms->persistent_fid = pfid->persistent_fid;
1751     parms->volatile_fid = pfid->volatile_fid;
1752     return SMB2_read(xid, parms, bytes_read, buf, buf_type);
1753 }
1754
1755 static int
1756 smb2_sync_write(const unsigned int xid, struct cifs_fid *pfid,
1757         struct cifs_io_parms *parms, unsigned int *written,
1758         struct kvec *iov, unsigned long nr_segs)
1759 {
1760
1761     parms->persistent_fid = pfid->persistent_fid;
1762     parms->volatile_fid = pfid->volatile_fid;
1763     return SMB2_write(xid, parms, written, iov, nr_segs);
1764 }
1765
1766 /* Set or clear the SPARSE_FILE attribute based on value passed in setsparse */
1767 static bool smb2_set_sparse(const unsigned int xid, struct cifs_tcon *tcon,
1768         struct cifsFileInfo *cfile, struct inode *inode, __u8 setsparse)
1769 {
1770     struct cifsInodeInfo *cifsi;
1771     int rc;
1772
1773     cifsi = CIFS_I(inode);
1774
1775     /* if file already sparse don't bother setting sparse again */
1776     if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) && setsparse)
1777         return true; /* already sparse */
1778
1779     if (!(cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) && !setsparse)
1780         return true; /* already not sparse */
1781
1782     /*
1783      * Can't check for sparse support on share the usual way via the
1784      * FS attribute info (FILE_SUPPORTS_SPARSE_FILES) on the share
1785      * since Samba server doesn't set the flag on the share, yet
1786      * supports the set sparse FSCTL and returns sparse correctly
1787      * in the file attributes. If we fail setting sparse though we
1788      * mark that server does not support sparse files for this share
1789      * to avoid repeatedly sending the unsupported fsctl to server
1790      * if the file is repeatedly extended.
1791      */
1792     if (tcon->broken_sparse_sup)
1793         return false;
1794
1795     rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
1796             cfile->fid.volatile_fid, FSCTL_SET_SPARSE,
1797             &setsparse, 1, CIFSMaxBufSize, NULL, NULL);
1798     if (rc) {
1799         tcon->broken_sparse_sup = true;
1800         cifs_dbg(FYI, "set sparse rc = %d\n", rc);
1801         return false;
1802     }
1803
1804     if (setsparse)
1805         cifsi->cifsAttrs |= FILE_ATTRIBUTE_SPARSE_FILE;
1806     else
1807         cifsi->cifsAttrs &= (~FILE_ATTRIBUTE_SPARSE_FILE);
1808
1809     return true;
1810 }
1811
1812 static int
1813 smb2_set_file_size(const unsigned int xid, struct cifs_tcon *tcon,
1814            struct cifsFileInfo *cfile, __u64 size, bool set_alloc)
1815 {
1816     __le64 eof = cpu_to_le64(size);
1817     struct inode *inode;
1818
1819     /*
1820      * If extending file more than one page make sparse. Many Linux fs
1821      * make files sparse by default when extending via ftruncate
1822      */
1823     inode = d_inode(cfile->dentry);
1824
1825     if (!set_alloc && (size > inode->i_size + 8192)) {
1826         __u8 set_sparse = 1;
1827
1828         /* whether set sparse succeeds or not, extend the file */
1829         smb2_set_sparse(xid, tcon, cfile, inode, set_sparse);
1830     }
1831
1832     return SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
1833                 cfile->fid.volatile_fid, cfile->pid, &eof);
1834 }
1835
1836 static int
1837 smb2_duplicate_extents(const unsigned int xid,
1838             struct cifsFileInfo *srcfile,
1839             struct cifsFileInfo *trgtfile, u64 src_off,
1840             u64 len, u64 dest_off)
1841 {
1842     int rc;
1843     unsigned int ret_data_len;
1844     struct inode *inode;
1845     struct duplicate_extents_to_file dup_ext_buf;
1846     struct cifs_tcon *tcon = tlink_tcon(trgtfile->tlink);
1847
1848     /* server fileays advertise duplicate extent support with this flag */
1849     if ((le32_to_cpu(tcon->fsAttrInfo.Attributes) &
1850          FILE_SUPPORTS_BLOCK_REFCOUNTING) == 0)
1851         return -EOPNOTSUPP;
1852
1853     dup_ext_buf.VolatileFileHandle = srcfile->fid.volatile_fid;
1854     dup_ext_buf.PersistentFileHandle = srcfile->fid.persistent_fid;
1855     dup_ext_buf.SourceFileOffset = cpu_to_le64(src_off);
1856     dup_ext_buf.TargetFileOffset = cpu_to_le64(dest_off);
1857     dup_ext_buf.ByteCount = cpu_to_le64(len);
1858     cifs_dbg(FYI, "Duplicate extents: src off %lld dst off %lld len %lld\n",
1859         src_off, dest_off, len);
1860
1861     inode = d_inode(trgtfile->dentry);
1862     if (inode->i_size < dest_off + len) {
1863         rc = smb2_set_file_size(xid, tcon, trgtfile, dest_off + len, false);
1864         if (rc)
1865             goto duplicate_extents_out;
1866
1867         /*
1868          * Although also could set plausible allocation size (i_blocks)
1869          * here in addition to setting the file size, in reflink
1870          * it is likely that the target file is sparse. Its allocation
1871          * size will be queried on next revalidate, but it is important
1872          * to make sure that file's cached size is updated immediately
1873          */
1874         cifs_setsize(inode, dest_off + len);
1875     }
1876     rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
1877             trgtfile->fid.volatile_fid,
1878             FSCTL_DUPLICATE_EXTENTS_TO_FILE,
1879             (char *)&dup_ext_buf,
1880             sizeof(struct duplicate_extents_to_file),
1881             CIFSMaxBufSize, NULL,
1882             &ret_data_len);
1883
1884     if (ret_data_len > 0)
1885         cifs_dbg(FYI, "Non-zero response length in duplicate extents\n");
1886
1887 duplicate_extents_out:
1888     return rc;
1889 }
1890
1891 static int
1892 smb2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
1893            struct cifsFileInfo *cfile)
1894 {
1895     return SMB2_set_compression(xid, tcon, cfile->fid.persistent_fid,
1896                 cfile->fid.volatile_fid);
1897 }
1898
1899 static int
1900 smb3_set_integrity(const unsigned int xid, struct cifs_tcon *tcon,
1901            struct cifsFileInfo *cfile)
1902 {
1903     struct fsctl_set_integrity_information_req integr_info;
1904     unsigned int ret_data_len;
1905
1906     integr_info.ChecksumAlgorithm = cpu_to_le16(CHECKSUM_TYPE_UNCHANGED);
1907     integr_info.Flags = 0;
1908     integr_info.Reserved = 0;
1909
1910     return SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
1911             cfile->fid.volatile_fid,
1912             FSCTL_SET_INTEGRITY_INFORMATION,
1913             (char *)&integr_info,
1914             sizeof(struct fsctl_set_integrity_information_req),
1915             CIFSMaxBufSize, NULL,
1916             &ret_data_len);
1917
1918 }
1919
1920 /* GMT Token is @GMT-YYYY.MM.DD-HH.MM.SS Unicode which is 48 bytes + null */
1921 #define GMT_TOKEN_SIZE 50
1922
1923 #define MIN_SNAPSHOT_ARRAY_SIZE 16 /* See MS-SMB2 section 3.3.5.15.1 */
1924
1925 /*
1926  * Input buffer contains (empty) struct smb_snapshot array with size filled in
1927  * For output see struct SRV_SNAPSHOT_ARRAY in MS-SMB2 section 2.2.32.2
1928  */
1929 static int
1930 smb3_enum_snapshots(const unsigned int xid, struct cifs_tcon *tcon,
1931            struct cifsFileInfo *cfile, void __user *ioc_buf)
1932 {
1933     char *retbuf = NULL;
1934     unsigned int ret_data_len = 0;
1935     int rc;
1936     u32 max_response_size;
1937     struct smb_snapshot_array snapshot_in;
1938
1939     /*
1940      * On the first query to enumerate the list of snapshots available
1941      * for this volume the buffer begins with 0 (number of snapshots
1942      * which can be returned is zero since at that point we do not know
1943      * how big the buffer needs to be). On the second query,
1944      * it (ret_data_len) is set to number of snapshots so we can
1945      * know to set the maximum response size larger (see below).
1946      */
1947     if (get_user(ret_data_len, (unsigned int __user *)ioc_buf))
1948         return -EFAULT;
1949
1950     /*
1951      * Note that for snapshot queries that servers like Azure expect that
1952      * the first query be minimal size (and just used to get the number/size
1953      * of previous versions) so response size must be specified as EXACTLY
1954      * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
1955      * of eight bytes.
1956      */
1957     if (ret_data_len == 0)
1958         max_response_size = MIN_SNAPSHOT_ARRAY_SIZE;
1959     else
1960         max_response_size = CIFSMaxBufSize;
1961
1962     rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
1963             cfile->fid.volatile_fid,
1964             FSCTL_SRV_ENUMERATE_SNAPSHOTS,
1965             NULL, 0 /* no input data */, max_response_size,
1966             (char **)&retbuf,
1967             &ret_data_len);
1968     cifs_dbg(FYI, "enum snaphots ioctl returned %d and ret buflen is %d\n",
1969             rc, ret_data_len);
1970     if (rc)
1971         return rc;
1972
1973     if (ret_data_len && (ioc_buf != NULL) && (retbuf != NULL)) {
1974         /* Fixup buffer */
1975         if (copy_from_user(&snapshot_in, ioc_buf,
1976             sizeof(struct smb_snapshot_array))) {
1977             rc = -EFAULT;
1978             kfree(retbuf);
1979             return rc;
1980         }
1981
1982         /*
1983          * Check for min size, ie not large enough to fit even one GMT
1984          * token (snapshot).  On the first ioctl some users may pass in
1985          * smaller size (or zero) to simply get the size of the array
1986          * so the user space caller can allocate sufficient memory
1987          * and retry the ioctl again with larger array size sufficient
1988          * to hold all of the snapshot GMT tokens on the second try.
1989          */
1990         if (snapshot_in.snapshot_array_size < GMT_TOKEN_SIZE)
1991             ret_data_len = sizeof(struct smb_snapshot_array);
1992
1993         /*
1994          * We return struct SRV_SNAPSHOT_ARRAY, followed by
1995          * the snapshot array (of 50 byte GMT tokens) each
1996          * representing an available previous version of the data
1997          */
1998         if (ret_data_len > (snapshot_in.snapshot_array_size +
1999                     sizeof(struct smb_snapshot_array)))
2000             ret_data_len = snapshot_in.snapshot_array_size +
2001                     sizeof(struct smb_snapshot_array);
2002
2003         if (copy_to_user(ioc_buf, retbuf, ret_data_len))
2004             rc = -EFAULT;
2005     }
2006
2007     kfree(retbuf);
2008     return rc;
2009 }
2010
2011
2012
2013 static int
2014 smb3_notify(const unsigned int xid, struct file *pfile,
2015         void __user *ioc_buf)
2016 {
2017     struct smb3_notify notify;
2018     struct dentry *dentry = pfile->f_path.dentry;
2019     struct inode *inode = file_inode(pfile);
2020     struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2021     struct cifs_open_parms oparms;
2022     struct cifs_fid fid;
2023     struct cifs_tcon *tcon;
2024     const unsigned char *path;
2025     void *page = alloc_dentry_path();
2026     __le16 *utf16_path = NULL;
2027     u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2028     int rc = 0;
2029
2030     path = build_path_from_dentry(dentry, page);
2031     if (IS_ERR(path)) {
2032         rc = PTR_ERR(path);
2033         goto notify_exit;
2034     }
2035
2036     utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
2037     if (utf16_path == NULL) {
2038         rc = -ENOMEM;
2039         goto notify_exit;
2040     }
2041
2042     if (copy_from_user(&notify, ioc_buf, sizeof(struct smb3_notify))) {
2043         rc = -EFAULT;
2044         goto notify_exit;
2045     }
2046
2047     tcon = cifs_sb_master_tcon(cifs_sb);
2048     oparms.tcon = tcon;
2049     oparms.desired_access = FILE_READ_ATTRIBUTES | FILE_READ_DATA;
2050     oparms.disposition = FILE_OPEN;
2051     oparms.create_options = cifs_create_options(cifs_sb, 0);
2052     oparms.fid = &fid;
2053     oparms.reconnect = false;
2054
2055     rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL,
2056                NULL);
2057     if (rc)
2058         goto notify_exit;
2059
2060     rc = SMB2_change_notify(xid, tcon, fid.persistent_fid, fid.volatile_fid,
2061                 notify.watch_tree, notify.completion_filter);
2062
2063     SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
2064
2065     cifs_dbg(FYI, "change notify for path %s rc %d\n", path, rc);
2066
2067 notify_exit:
2068     free_dentry_path(page);
2069     kfree(utf16_path);
2070     return rc;
2071 }
2072
2073 static int
2074 smb2_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
2075              const char *path, struct cifs_sb_info *cifs_sb,
2076              struct cifs_fid *fid, __u16 search_flags,
2077              struct cifs_search_info *srch_inf)
2078 {
2079     __le16 *utf16_path;
2080     struct smb_rqst rqst[2];
2081     struct kvec rsp_iov[2];
2082     int resp_buftype[2];
2083     struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
2084     struct kvec qd_iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
2085     int rc, flags = 0;
2086     u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2087     struct cifs_open_parms oparms;
2088     struct smb2_query_directory_rsp *qd_rsp = NULL;
2089     struct smb2_create_rsp *op_rsp = NULL;
2090     struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
2091     int retry_count = 0;
2092
2093     utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
2094     if (!utf16_path)
2095         return -ENOMEM;
2096
2097     if (smb3_encryption_required(tcon))
2098         flags |= CIFS_TRANSFORM_REQ;
2099
2100     memset(rqst, 0, sizeof(rqst));
2101     resp_buftype[0] = resp_buftype[1] = CIFS_NO_BUFFER;
2102     memset(rsp_iov, 0, sizeof(rsp_iov));
2103
2104     /* Open */
2105     memset(&open_iov, 0, sizeof(open_iov));
2106     rqst[0].rq_iov = open_iov;
2107     rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
2108
2109     oparms.tcon = tcon;
2110     oparms.desired_access = FILE_READ_ATTRIBUTES | FILE_READ_DATA;
2111     oparms.disposition = FILE_OPEN;
2112     oparms.create_options = cifs_create_options(cifs_sb, 0);
2113     oparms.fid = fid;
2114     oparms.reconnect = false;
2115
2116     rc = SMB2_open_init(tcon, server,
2117                 &rqst[0], &oplock, &oparms, utf16_path);
2118     if (rc)
2119         goto qdf_free;
2120     smb2_set_next_command(tcon, &rqst[0]);
2121
2122     /* Query directory */
2123     srch_inf->entries_in_buffer = 0;
2124     srch_inf->index_of_last_entry = 2;
2125
2126     memset(&qd_iov, 0, sizeof(qd_iov));
2127     rqst[1].rq_iov = qd_iov;
2128     rqst[1].rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
2129
2130     rc = SMB2_query_directory_init(xid, tcon, server,
2131                        &rqst[1],
2132                        COMPOUND_FID, COMPOUND_FID,
2133                        0, srch_inf->info_level);
2134     if (rc)
2135         goto qdf_free;
2136
2137     smb2_set_related(&rqst[1]);
2138
2139 again:
2140     rc = compound_send_recv(xid, tcon->ses, server,
2141                 flags, 2, rqst,
2142                 resp_buftype, rsp_iov);
2143
2144     if (rc == -EAGAIN && retry_count++ < 10)
2145         goto again;
2146
2147     /* If the open failed there is nothing to do */
2148     op_rsp = (struct smb2_create_rsp *)rsp_iov[0].iov_base;
2149     if (op_rsp == NULL || op_rsp->hdr.Status != STATUS_SUCCESS) {
2150         cifs_dbg(FYI, "query_dir_first: open failed rc=%d\n", rc);
2151         goto qdf_free;
2152     }
2153     fid->persistent_fid = op_rsp->PersistentFileId;
2154     fid->volatile_fid = op_rsp->VolatileFileId;
2155
2156     /* Anything else than ENODATA means a genuine error */
2157     if (rc && rc != -ENODATA) {
2158         SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
2159         cifs_dbg(FYI, "query_dir_first: query directory failed rc=%d\n", rc);
2160         trace_smb3_query_dir_err(xid, fid->persistent_fid,
2161                      tcon->tid, tcon->ses->Suid, 0, 0, rc);
2162         goto qdf_free;
2163     }
2164
2165     atomic_inc(&tcon->num_remote_opens);
2166
2167     qd_rsp = (struct smb2_query_directory_rsp *)rsp_iov[1].iov_base;
2168     if (qd_rsp->hdr.Status == STATUS_NO_MORE_FILES) {
2169         trace_smb3_query_dir_done(xid, fid->persistent_fid,
2170                       tcon->tid, tcon->ses->Suid, 0, 0);
2171         srch_inf->endOfSearch = true;
2172         rc = 0;
2173         goto qdf_free;
2174     }
2175
2176     rc = smb2_parse_query_directory(tcon, &rsp_iov[1], resp_buftype[1],
2177                     srch_inf);
2178     if (rc) {
2179         trace_smb3_query_dir_err(xid, fid->persistent_fid, tcon->tid,
2180             tcon->ses->Suid, 0, 0, rc);
2181         goto qdf_free;
2182     }
2183     resp_buftype[1] = CIFS_NO_BUFFER;
2184
2185     trace_smb3_query_dir_done(xid, fid->persistent_fid, tcon->tid,
2186             tcon->ses->Suid, 0, srch_inf->entries_in_buffer);
2187
2188  qdf_free:
2189     kfree(utf16_path);
2190     SMB2_open_free(&rqst[0]);
2191     SMB2_query_directory_free(&rqst[1]);
2192     free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
2193     free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
2194     return rc;
2195 }
2196
2197 static int
2198 smb2_query_dir_next(const unsigned int xid, struct cifs_tcon *tcon,
2199             struct cifs_fid *fid, __u16 search_flags,
2200             struct cifs_search_info *srch_inf)
2201 {
2202     return SMB2_query_directory(xid, tcon, fid->persistent_fid,
2203                     fid->volatile_fid, 0, srch_inf);
2204 }
2205
2206 static int
2207 smb2_close_dir(const unsigned int xid, struct cifs_tcon *tcon,
2208            struct cifs_fid *fid)
2209 {
2210     return SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
2211 }
2212
2213 /*
2214  * If we negotiate SMB2 protocol and get STATUS_PENDING - update
2215  * the number of credits and return true. Otherwise - return false.
2216  */
2217 static bool
2218 smb2_is_status_pending(char *buf, struct TCP_Server_Info *server)
2219 {
2220     struct smb2_hdr *shdr = (struct smb2_hdr *)buf;
2221     int scredits, in_flight;
2222
2223     if (shdr->Status != STATUS_PENDING)
2224         return false;
2225
2226     if (shdr->CreditRequest) {
2227         spin_lock(&server->req_lock);
2228         server->credits += le16_to_cpu(shdr->CreditRequest);
2229         scredits = server->credits;
2230         in_flight = server->in_flight;
2231         spin_unlock(&server->req_lock);
2232         wake_up(&server->request_q);
2233
2234         trace_smb3_pend_credits(server->CurrentMid,
2235                 server->conn_id, server->hostname, scredits,
2236                 le16_to_cpu(shdr->CreditRequest), in_flight);
2237         cifs_dbg(FYI, "%s: status pending add %u credits total=%d\n",
2238                 __func__, le16_to_cpu(shdr->CreditRequest), scredits);
2239     }
2240
2241     return true;
2242 }
2243
2244 static bool
2245 smb2_is_session_expired(char *buf)
2246 {
2247     struct smb2_hdr *shdr = (struct smb2_hdr *)buf;
2248
2249     if (shdr->Status != STATUS_NETWORK_SESSION_EXPIRED &&
2250         shdr->Status != STATUS_USER_SESSION_DELETED)
2251         return false;
2252
2253     trace_smb3_ses_expired(le32_to_cpu(shdr->Id.SyncId.TreeId),
2254                    le64_to_cpu(shdr->SessionId),
2255                    le16_to_cpu(shdr->Command),
2256                    le64_to_cpu(shdr->MessageId));
2257     cifs_dbg(FYI, "Session expired or deleted\n");
2258
2259     return true;
2260 }
2261
2262 static bool
2263 smb2_is_status_io_timeout(char *buf)
2264 {
2265     struct smb2_hdr *shdr = (struct smb2_hdr *)buf;
2266
2267     if (shdr->Status == STATUS_IO_TIMEOUT)
2268         return true;
2269     else
2270         return false;
2271 }
2272
2273 static void
2274 smb2_is_network_name_deleted(char *buf, struct TCP_Server_Info *server)
2275 {
2276     struct smb2_hdr *shdr = (struct smb2_hdr *)buf;
2277     struct cifs_ses *ses;
2278     struct cifs_tcon *tcon;
2279
2280     if (shdr->Status != STATUS_NETWORK_NAME_DELETED)
2281         return;
2282
2283     spin_lock(&cifs_tcp_ses_lock);
2284     list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2285         list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
2286             if (tcon->tid == le32_to_cpu(shdr->Id.SyncId.TreeId)) {
2287                 spin_lock(&tcon->tc_lock);
2288                 tcon->need_reconnect = true;
2289                 spin_unlock(&tcon->tc_lock);
2290                 spin_unlock(&cifs_tcp_ses_lock);
2291                 pr_warn_once("Server share %s deleted.\n",
2292                          tcon->treeName);
2293                 return;
2294             }
2295         }
2296     }
2297     spin_unlock(&cifs_tcp_ses_lock);
2298 }
2299
2300 static int
2301 smb2_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *fid,
2302              struct cifsInodeInfo *cinode)
2303 {
2304     if (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING)
2305         return SMB2_lease_break(0, tcon, cinode->lease_key,
2306                     smb2_get_lease_state(cinode));
2307
2308     return SMB2_oplock_break(0, tcon, fid->persistent_fid,
2309                  fid->volatile_fid,
2310                  CIFS_CACHE_READ(cinode) ? 1 : 0);
2311 }
2312
2313 void
2314 smb2_set_related(struct smb_rqst *rqst)
2315 {
2316     struct smb2_hdr *shdr;
2317
2318     shdr = (struct smb2_hdr *)(rqst->rq_iov[0].iov_base);
2319     if (shdr == NULL) {
2320         cifs_dbg(FYI, "shdr NULL in smb2_set_related\n");
2321         return;
2322     }
2323     shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
2324 }
2325
2326 char smb2_padding[7] = {0, 0, 0, 0, 0, 0, 0};
2327
2328 void
2329 smb2_set_next_command(struct cifs_tcon *tcon, struct smb_rqst *rqst)
2330 {
2331     struct smb2_hdr *shdr;
2332     struct cifs_ses *ses = tcon->ses;
2333     struct TCP_Server_Info *server = ses->server;
2334     unsigned long len = smb_rqst_len(server, rqst);
2335     int i, num_padding;
2336
2337     shdr = (struct smb2_hdr *)(rqst->rq_iov[0].iov_base);
2338     if (shdr == NULL) {
2339         cifs_dbg(FYI, "shdr NULL in smb2_set_next_command\n");
2340         return;
2341     }
2342
2343     /* SMB headers in a compound are 8 byte aligned. */
2344
2345     /* No padding needed */
2346     if (!(len & 7))
2347         goto finished;
2348
2349     num_padding = 8 - (len & 7);
2350     if (!smb3_encryption_required(tcon)) {
2351         /*
2352          * If we do not have encryption then we can just add an extra
2353          * iov for the padding.
2354          */
2355         rqst->rq_iov[rqst->rq_nvec].iov_base = smb2_padding;
2356         rqst->rq_iov[rqst->rq_nvec].iov_len = num_padding;
2357         rqst->rq_nvec++;
2358         len += num_padding;
2359     } else {
2360         /*
2361          * We can not add a small padding iov for the encryption case
2362          * because the encryption framework can not handle the padding
2363          * iovs.
2364          * We have to flatten this into a single buffer and add
2365          * the padding to it.
2366          */
2367         for (i = 1; i < rqst->rq_nvec; i++) {
2368             memcpy(rqst->rq_iov[0].iov_base +
2369                    rqst->rq_iov[0].iov_len,
2370                    rqst->rq_iov[i].iov_base,
2371                    rqst->rq_iov[i].iov_len);
2372             rqst->rq_iov[0].iov_len += rqst->rq_iov[i].iov_len;
2373         }
2374         memset(rqst->rq_iov[0].iov_base + rqst->rq_iov[0].iov_len,
2375                0, num_padding);
2376         rqst->rq_iov[0].iov_len += num_padding;
2377         len += num_padding;
2378         rqst->rq_nvec = 1;
2379     }
2380
2381  finished:
2382     shdr->NextCommand = cpu_to_le32(len);
2383 }
2384
2385 /*
2386  * Passes the query info response back to the caller on success.
2387  * Caller need to free this with free_rsp_buf().
2388  */
2389 int
2390 smb2_query_info_compound(const unsigned int xid, struct cifs_tcon *tcon,
2391              const char *path, u32 desired_access,
2392              u32 class, u32 type, u32 output_len,
2393              struct kvec *rsp, int *buftype,
2394              struct cifs_sb_info *cifs_sb)
2395 {
2396     struct cifs_ses *ses = tcon->ses;
2397     struct TCP_Server_Info *server = cifs_pick_channel(ses);
2398     int flags = CIFS_CP_CREATE_CLOSE_OP;
2399     struct smb_rqst rqst[3];
2400     int resp_buftype[3];
2401     struct kvec rsp_iov[3];
2402     struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
2403     struct kvec qi_iov[1];
2404     struct kvec close_iov[1];
2405     u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2406     struct cifs_open_parms oparms;
2407     struct cifs_fid fid;
2408     int rc;
2409     __le16 *utf16_path;
2410     struct cached_fid *cfid = NULL;
2411
2412     if (!path)
2413         path = "";
2414     utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
2415     if (!utf16_path)
2416         return -ENOMEM;
2417
2418     if (smb3_encryption_required(tcon))
2419         flags |= CIFS_TRANSFORM_REQ;
2420
2421     memset(rqst, 0, sizeof(rqst));
2422     resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
2423     memset(rsp_iov, 0, sizeof(rsp_iov));
2424
2425     /*
2426      * We can only call this for things we know are directories.
2427      */
2428     if (!strcmp(path, ""))
2429         open_cached_dir(xid, tcon, path, cifs_sb, false,
2430                 &cfid); /* cfid null if open dir failed */
2431
2432     memset(&open_iov, 0, sizeof(open_iov));
2433     rqst[0].rq_iov = open_iov;
2434     rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
2435
2436     oparms.tcon = tcon;
2437     oparms.desired_access = desired_access;
2438     oparms.disposition = FILE_OPEN;
2439     oparms.create_options = cifs_create_options(cifs_sb, 0);
2440     oparms.fid = &fid;
2441     oparms.reconnect = false;
2442
2443     rc = SMB2_open_init(tcon, server,
2444                 &rqst[0], &oplock, &oparms, utf16_path);
2445     if (rc)
2446         goto qic_exit;
2447     smb2_set_next_command(tcon, &rqst[0]);
2448
2449     memset(&qi_iov, 0, sizeof(qi_iov));
2450     rqst[1].rq_iov = qi_iov;
2451     rqst[1].rq_nvec = 1;
2452
2453     if (cfid) {
2454         rc = SMB2_query_info_init(tcon, server,
2455                       &rqst[1],
2456                       cfid->fid.persistent_fid,
2457                       cfid->fid.volatile_fid,
2458                       class, type, 0,
2459                       output_len, 0,
2460                       NULL);
2461     } else {
2462         rc = SMB2_query_info_init(tcon, server,
2463                       &rqst[1],
2464                       COMPOUND_FID,
2465                       COMPOUND_FID,
2466                       class, type, 0,
2467                       output_len, 0,
2468                       NULL);
2469     }
2470     if (rc)
2471         goto qic_exit;
2472     if (!cfid) {
2473         smb2_set_next_command(tcon, &rqst[1]);
2474         smb2_set_related(&rqst[1]);
2475     }
2476
2477     memset(&close_iov, 0, sizeof(close_iov));
2478     rqst[2].rq_iov = close_iov;
2479     rqst[2].rq_nvec = 1;
2480
2481     rc = SMB2_close_init(tcon, server,
2482                  &rqst[2], COMPOUND_FID, COMPOUND_FID, false);
2483     if (rc)
2484         goto qic_exit;
2485     smb2_set_related(&rqst[2]);
2486
2487     if (cfid) {
2488         rc = compound_send_recv(xid, ses, server,
2489                     flags, 1, &rqst[1],
2490                     &resp_buftype[1], &rsp_iov[1]);
2491     } else {
2492         rc = compound_send_recv(xid, ses, server,
2493                     flags, 3, rqst,
2494                     resp_buftype, rsp_iov);
2495     }
2496     if (rc) {
2497         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
2498         if (rc == -EREMCHG) {
2499             tcon->need_reconnect = true;
2500             pr_warn_once("server share %s deleted\n",
2501                      tcon->treeName);
2502         }
2503         goto qic_exit;
2504     }
2505     *rsp = rsp_iov[1];
2506     *buftype = resp_buftype[1];
2507
2508  qic_exit:
2509     kfree(utf16_path);
2510     SMB2_open_free(&rqst[0]);
2511     SMB2_query_info_free(&rqst[1]);
2512     SMB2_close_free(&rqst[2]);
2513     free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
2514     free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
2515     if (cfid)
2516         close_cached_dir(cfid);
2517     return rc;
2518 }
2519
2520 static int
2521 smb2_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
2522          struct cifs_sb_info *cifs_sb, struct kstatfs *buf)
2523 {
2524     struct smb2_query_info_rsp *rsp;
2525     struct smb2_fs_full_size_info *info = NULL;
2526     struct kvec rsp_iov = {NULL, 0};
2527     int buftype = CIFS_NO_BUFFER;
2528     int rc;
2529
2530
2531     rc = smb2_query_info_compound(xid, tcon, "",
2532                       FILE_READ_ATTRIBUTES,
2533                       FS_FULL_SIZE_INFORMATION,
2534                       SMB2_O_INFO_FILESYSTEM,
2535                       sizeof(struct smb2_fs_full_size_info),
2536                       &rsp_iov, &buftype, cifs_sb);
2537     if (rc)
2538         goto qfs_exit;
2539
2540     rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2541     buf->f_type = SMB2_SUPER_MAGIC;
2542     info = (struct smb2_fs_full_size_info *)(
2543         le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
2544     rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
2545                    le32_to_cpu(rsp->OutputBufferLength),
2546                    &rsp_iov,
2547                    sizeof(struct smb2_fs_full_size_info));
2548     if (!rc)
2549         smb2_copy_fs_info_to_kstatfs(info, buf);
2550
2551 qfs_exit:
2552     free_rsp_buf(buftype, rsp_iov.iov_base);
2553     return rc;
2554 }
2555
2556 static int
2557 smb311_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
2558            struct cifs_sb_info *cifs_sb, struct kstatfs *buf)
2559 {
2560     int rc;
2561     __le16 srch_path = 0; /* Null - open root of share */
2562     u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2563     struct cifs_open_parms oparms;
2564     struct cifs_fid fid;
2565
2566     if (!tcon->posix_extensions)
2567         return smb2_queryfs(xid, tcon, cifs_sb, buf);
2568
2569     oparms.tcon = tcon;
2570     oparms.desired_access = FILE_READ_ATTRIBUTES;
2571     oparms.disposition = FILE_OPEN;
2572     oparms.create_options = cifs_create_options(cifs_sb, 0);
2573     oparms.fid = &fid;
2574     oparms.reconnect = false;
2575
2576     rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL,
2577                NULL, NULL);
2578     if (rc)
2579         return rc;
2580
2581     rc = SMB311_posix_qfs_info(xid, tcon, fid.persistent_fid,
2582                    fid.volatile_fid, buf);
2583     buf->f_type = SMB2_SUPER_MAGIC;
2584     SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
2585     return rc;
2586 }
2587
2588 static bool
2589 smb2_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)
2590 {
2591     return ob1->fid.persistent_fid == ob2->fid.persistent_fid &&
2592            ob1->fid.volatile_fid == ob2->fid.volatile_fid;
2593 }
2594
2595 static int
2596 smb2_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
2597            __u64 length, __u32 type, int lock, int unlock, bool wait)
2598 {
2599     if (unlock && !lock)
2600         type = SMB2_LOCKFLAG_UNLOCK;
2601     return SMB2_lock(xid, tlink_tcon(cfile->tlink),
2602              cfile->fid.persistent_fid, cfile->fid.volatile_fid,
2603              current->tgid, length, offset, type, wait);
2604 }
2605
2606 static void
2607 smb2_get_lease_key(struct inode *inode, struct cifs_fid *fid)
2608 {
2609     memcpy(fid->lease_key, CIFS_I(inode)->lease_key, SMB2_LEASE_KEY_SIZE);
2610 }
2611
2612 static void
2613 smb2_set_lease_key(struct inode *inode, struct cifs_fid *fid)
2614 {
2615     memcpy(CIFS_I(inode)->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE);
2616 }
2617
2618 static void
2619 smb2_new_lease_key(struct cifs_fid *fid)
2620 {
2621     generate_random_uuid(fid->lease_key);
2622 }
2623
2624 static int
2625 smb2_get_dfs_refer(const unsigned int xid, struct cifs_ses *ses,
2626            const char *search_name,
2627            struct dfs_info3_param **target_nodes,
2628            unsigned int *num_of_nodes,
2629            const struct nls_table *nls_codepage, int remap)
2630 {
2631     int rc;
2632     __le16 *utf16_path = NULL;
2633     int utf16_path_len = 0;
2634     struct cifs_tcon *tcon;
2635     struct fsctl_get_dfs_referral_req *dfs_req = NULL;
2636     struct get_dfs_referral_rsp *dfs_rsp = NULL;
2637     u32 dfs_req_size = 0, dfs_rsp_size = 0;
2638     int retry_count = 0;
2639
2640     cifs_dbg(FYI, "%s: path: %s\n", __func__, search_name);
2641
2642     /*
2643      * Try to use the IPC tcon, otherwise just use any
2644      */
2645     tcon = ses->tcon_ipc;
2646     if (tcon == NULL) {
2647         spin_lock(&cifs_tcp_ses_lock);
2648         tcon = list_first_entry_or_null(&ses->tcon_list,
2649                         struct cifs_tcon,
2650                         tcon_list);
2651         if (tcon)
2652             tcon->tc_count++;
2653         spin_unlock(&cifs_tcp_ses_lock);
2654     }
2655
2656     if (tcon == NULL) {
2657         cifs_dbg(VFS, "session %p has no tcon available for a dfs referral request\n",
2658              ses);
2659         rc = -ENOTCONN;
2660         goto out;
2661     }
2662
2663     utf16_path = cifs_strndup_to_utf16(search_name, PATH_MAX,
2664                        &utf16_path_len,
2665                        nls_codepage, remap);
2666     if (!utf16_path) {
2667         rc = -ENOMEM;
2668         goto out;
2669     }
2670
2671     dfs_req_size = sizeof(*dfs_req) + utf16_path_len;
2672     dfs_req = kzalloc(dfs_req_size, GFP_KERNEL);
2673     if (!dfs_req) {
2674         rc = -ENOMEM;
2675         goto out;
2676     }
2677
2678     /* Highest DFS referral version understood */
2679     dfs_req->MaxReferralLevel = DFS_VERSION;
2680
2681     /* Path to resolve in an UTF-16 null-terminated string */
2682     memcpy(dfs_req->RequestFileName, utf16_path, utf16_path_len);
2683
2684     do {
2685         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
2686                 FSCTL_DFS_GET_REFERRALS,
2687                 (char *)dfs_req, dfs_req_size, CIFSMaxBufSize,
2688                 (char **)&dfs_rsp, &dfs_rsp_size);
2689         if (!is_retryable_error(rc))
2690             break;
2691         usleep_range(512, 2048);
2692     } while (++retry_count < 5);
2693
2694     if (rc) {
2695         if (!is_retryable_error(rc) && rc != -ENOENT && rc != -EOPNOTSUPP)
2696             cifs_tcon_dbg(VFS, "%s: ioctl error: rc=%d\n", __func__, rc);
2697         goto out;
2698     }
2699
2700     rc = parse_dfs_referrals(dfs_rsp, dfs_rsp_size,
2701                  num_of_nodes, target_nodes,
2702                  nls_codepage, remap, search_name,
2703                  true /* is_unicode */);
2704     if (rc) {
2705         cifs_tcon_dbg(VFS, "parse error in %s rc=%d\n", __func__, rc);
2706         goto out;
2707     }
2708
2709  out:
2710     if (tcon && !tcon->ipc) {
2711         /* ipc tcons are not refcounted */
2712         spin_lock(&cifs_tcp_ses_lock);
2713         tcon->tc_count--;
2714         /* tc_count can never go negative */
2715         WARN_ON(tcon->tc_count < 0);
2716         spin_unlock(&cifs_tcp_ses_lock);
2717     }
2718     kfree(utf16_path);
2719     kfree(dfs_req);
2720     kfree(dfs_rsp);
2721     return rc;
2722 }
2723
2724 static int
2725 parse_reparse_posix(struct reparse_posix_data *symlink_buf,
2726               u32 plen, char **target_path,
2727               struct cifs_sb_info *cifs_sb)
2728 {
2729     unsigned int len;
2730
2731     /* See MS-FSCC 2.1.2.6 for the 'NFS' style reparse tags */
2732     len = le16_to_cpu(symlink_buf->ReparseDataLength);
2733
2734     if (le64_to_cpu(symlink_buf->InodeType) != NFS_SPECFILE_LNK) {
2735         cifs_dbg(VFS, "%lld not a supported symlink type\n",
2736             le64_to_cpu(symlink_buf->InodeType));
2737         return -EOPNOTSUPP;
2738     }
2739
2740     *target_path = cifs_strndup_from_utf16(
2741                 symlink_buf->PathBuffer,
2742                 len, true, cifs_sb->local_nls);
2743     if (!(*target_path))
2744         return -ENOMEM;
2745
2746     convert_delimiter(*target_path, '/');
2747     cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
2748
2749     return 0;
2750 }
2751
2752 static int
2753 parse_reparse_symlink(struct reparse_symlink_data_buffer *symlink_buf,
2754               u32 plen, char **target_path,
2755               struct cifs_sb_info *cifs_sb)
2756 {
2757     unsigned int sub_len;
2758     unsigned int sub_offset;
2759
2760     /* We handle Symbolic Link reparse tag here. See: MS-FSCC 2.1.2.4 */
2761
2762     sub_offset = le16_to_cpu(symlink_buf->SubstituteNameOffset);
2763     sub_len = le16_to_cpu(symlink_buf->SubstituteNameLength);
2764     if (sub_offset + 20 > plen ||
2765         sub_offset + sub_len + 20 > plen) {
2766         cifs_dbg(VFS, "srv returned malformed symlink buffer\n");
2767         return -EIO;
2768     }
2769
2770     *target_path = cifs_strndup_from_utf16(
2771                 symlink_buf->PathBuffer + sub_offset,
2772                 sub_len, true, cifs_sb->local_nls);
2773     if (!(*target_path))
2774         return -ENOMEM;
2775
2776     convert_delimiter(*target_path, '/');
2777     cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
2778
2779     return 0;
2780 }
2781
2782 static int
2783 parse_reparse_point(struct reparse_data_buffer *buf,
2784             u32 plen, char **target_path,
2785             struct cifs_sb_info *cifs_sb)
2786 {
2787     if (plen < sizeof(struct reparse_data_buffer)) {
2788         cifs_dbg(VFS, "reparse buffer is too small. Must be at least 8 bytes but was %d\n",
2789              plen);
2790         return -EIO;
2791     }
2792
2793     if (plen < le16_to_cpu(buf->ReparseDataLength) +
2794         sizeof(struct reparse_data_buffer)) {
2795         cifs_dbg(VFS, "srv returned invalid reparse buf length: %d\n",
2796              plen);
2797         return -EIO;
2798     }
2799
2800     /* See MS-FSCC 2.1.2 */
2801     switch (le32_to_cpu(buf->ReparseTag)) {
2802     case IO_REPARSE_TAG_NFS:
2803         return parse_reparse_posix(
2804             (struct reparse_posix_data *)buf,
2805             plen, target_path, cifs_sb);
2806     case IO_REPARSE_TAG_SYMLINK:
2807         return parse_reparse_symlink(
2808             (struct reparse_symlink_data_buffer *)buf,
2809             plen, target_path, cifs_sb);
2810     default:
2811         cifs_dbg(VFS, "srv returned unknown symlink buffer tag:0x%08x\n",
2812              le32_to_cpu(buf->ReparseTag));
2813         return -EOPNOTSUPP;
2814     }
2815 }
2816
2817 #define SMB2_SYMLINK_STRUCT_SIZE \
2818     (sizeof(struct smb2_err_rsp) - 1 + sizeof(struct smb2_symlink_err_rsp))
2819
2820 static int
2821 smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
2822            struct cifs_sb_info *cifs_sb, const char *full_path,
2823            char **target_path, bool is_reparse_point)
2824 {
2825     int rc;
2826     __le16 *utf16_path = NULL;
2827     __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2828     struct cifs_open_parms oparms;
2829     struct cifs_fid fid;
2830     struct kvec err_iov = {NULL, 0};
2831     struct smb2_err_rsp *err_buf = NULL;
2832     struct smb2_symlink_err_rsp *symlink;
2833     struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
2834     unsigned int sub_len;
2835     unsigned int sub_offset;
2836     unsigned int print_len;
2837     unsigned int print_offset;
2838     int flags = CIFS_CP_CREATE_CLOSE_OP;
2839     struct smb_rqst rqst[3];
2840     int resp_buftype[3];
2841     struct kvec rsp_iov[3];
2842     struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
2843     struct kvec io_iov[SMB2_IOCTL_IOV_SIZE];
2844     struct kvec close_iov[1];
2845     struct smb2_create_rsp *create_rsp;
2846     struct smb2_ioctl_rsp *ioctl_rsp;
2847     struct reparse_data_buffer *reparse_buf;
2848     int create_options = is_reparse_point ? OPEN_REPARSE_POINT : 0;
2849     u32 plen;
2850
2851     cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
2852
2853     *target_path = NULL;
2854
2855     if (smb3_encryption_required(tcon))
2856         flags |= CIFS_TRANSFORM_REQ;
2857
2858     memset(rqst, 0, sizeof(rqst));
2859     resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
2860     memset(rsp_iov, 0, sizeof(rsp_iov));
2861
2862     utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2863     if (!utf16_path)
2864         return -ENOMEM;
2865
2866     /* Open */
2867     memset(&open_iov, 0, sizeof(open_iov));
2868     rqst[0].rq_iov = open_iov;
2869     rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
2870
2871     memset(&oparms, 0, sizeof(oparms));
2872     oparms.tcon = tcon;
2873     oparms.desired_access = FILE_READ_ATTRIBUTES;
2874     oparms.disposition = FILE_OPEN;
2875     oparms.create_options = cifs_create_options(cifs_sb, create_options);
2876     oparms.fid = &fid;
2877     oparms.reconnect = false;
2878
2879     rc = SMB2_open_init(tcon, server,
2880                 &rqst[0], &oplock, &oparms, utf16_path);
2881     if (rc)
2882         goto querty_exit;
2883     smb2_set_next_command(tcon, &rqst[0]);
2884
2885
2886     /* IOCTL */
2887     memset(&io_iov, 0, sizeof(io_iov));
2888     rqst[1].rq_iov = io_iov;
2889     rqst[1].rq_nvec = SMB2_IOCTL_IOV_SIZE;
2890
2891     rc = SMB2_ioctl_init(tcon, server,
2892                  &rqst[1], fid.persistent_fid,
2893                  fid.volatile_fid, FSCTL_GET_REPARSE_POINT, NULL, 0,
2894                  CIFSMaxBufSize -
2895                  MAX_SMB2_CREATE_RESPONSE_SIZE -
2896                  MAX_SMB2_CLOSE_RESPONSE_SIZE);
2897     if (rc)
2898         goto querty_exit;
2899
2900     smb2_set_next_command(tcon, &rqst[1]);
2901     smb2_set_related(&rqst[1]);
2902
2903
2904     /* Close */
2905     memset(&close_iov, 0, sizeof(close_iov));
2906     rqst[2].rq_iov = close_iov;
2907     rqst[2].rq_nvec = 1;
2908
2909     rc = SMB2_close_init(tcon, server,
2910                  &rqst[2], COMPOUND_FID, COMPOUND_FID, false);
2911     if (rc)
2912         goto querty_exit;
2913
2914     smb2_set_related(&rqst[2]);
2915
2916     rc = compound_send_recv(xid, tcon->ses, server,
2917                 flags, 3, rqst,
2918                 resp_buftype, rsp_iov);
2919
2920     create_rsp = rsp_iov[0].iov_base;
2921     if (create_rsp && create_rsp->hdr.Status)
2922         err_iov = rsp_iov[0];
2923     ioctl_rsp = rsp_iov[1].iov_base;
2924
2925     /*
2926      * Open was successful and we got an ioctl response.
2927      */
2928     if ((rc == 0) && (is_reparse_point)) {
2929         /* See MS-FSCC 2.3.23 */
2930
2931         reparse_buf = (struct reparse_data_buffer *)
2932             ((char *)ioctl_rsp +
2933              le32_to_cpu(ioctl_rsp->OutputOffset));
2934         plen = le32_to_cpu(ioctl_rsp->OutputCount);
2935
2936         if (plen + le32_to_cpu(ioctl_rsp->OutputOffset) >
2937             rsp_iov[1].iov_len) {
2938             cifs_tcon_dbg(VFS, "srv returned invalid ioctl len: %d\n",
2939                  plen);
2940             rc = -EIO;
2941             goto querty_exit;
2942         }
2943
2944         rc = parse_reparse_point(reparse_buf, plen, target_path,
2945                      cifs_sb);
2946         goto querty_exit;
2947     }
2948
2949     if (!rc || !err_iov.iov_base) {
2950         rc = -ENOENT;
2951         goto querty_exit;
2952     }
2953
2954     err_buf = err_iov.iov_base;
2955     if (le32_to_cpu(err_buf->ByteCount) < sizeof(struct smb2_symlink_err_rsp) ||
2956         err_iov.iov_len < SMB2_SYMLINK_STRUCT_SIZE) {
2957         rc = -EINVAL;
2958         goto querty_exit;
2959     }
2960
2961     symlink = (struct smb2_symlink_err_rsp *)err_buf->ErrorData;
2962     if (le32_to_cpu(symlink->SymLinkErrorTag) != SYMLINK_ERROR_TAG ||
2963         le32_to_cpu(symlink->ReparseTag) != IO_REPARSE_TAG_SYMLINK) {
2964         rc = -EINVAL;
2965         goto querty_exit;
2966     }
2967
2968     /* open must fail on symlink - reset rc */
2969     rc = 0;
2970     sub_len = le16_to_cpu(symlink->SubstituteNameLength);
2971     sub_offset = le16_to_cpu(symlink->SubstituteNameOffset);
2972     print_len = le16_to_cpu(symlink->PrintNameLength);
2973     print_offset = le16_to_cpu(symlink->PrintNameOffset);
2974
2975     if (err_iov.iov_len < SMB2_SYMLINK_STRUCT_SIZE + sub_offset + sub_len) {
2976         rc = -EINVAL;
2977         goto querty_exit;
2978     }
2979
2980     if (err_iov.iov_len <
2981         SMB2_SYMLINK_STRUCT_SIZE + print_offset + print_len) {
2982         rc = -EINVAL;
2983         goto querty_exit;
2984     }
2985
2986     *target_path = cifs_strndup_from_utf16(
2987                 (char *)symlink->PathBuffer + sub_offset,
2988                 sub_len, true, cifs_sb->local_nls);
2989     if (!(*target_path)) {
2990         rc = -ENOMEM;
2991         goto querty_exit;
2992     }
2993     convert_delimiter(*target_path, '/');
2994     cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
2995
2996  querty_exit:
2997     cifs_dbg(FYI, "query symlink rc %d\n", rc);
2998     kfree(utf16_path);
2999     SMB2_open_free(&rqst[0]);
3000     SMB2_ioctl_free(&rqst[1]);
3001     SMB2_close_free(&rqst[2]);
3002     free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
3003     free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
3004     free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
3005     return rc;
3006 }
3007
3008 int
3009 smb2_query_reparse_tag(const unsigned int xid, struct cifs_tcon *tcon,
3010            struct cifs_sb_info *cifs_sb, const char *full_path,
3011            __u32 *tag)
3012 {
3013     int rc;
3014     __le16 *utf16_path = NULL;
3015     __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
3016     struct cifs_open_parms oparms;
3017     struct cifs_fid fid;
3018     struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
3019     int flags = CIFS_CP_CREATE_CLOSE_OP;
3020     struct smb_rqst rqst[3];
3021     int resp_buftype[3];
3022     struct kvec rsp_iov[3];
3023     struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
3024     struct kvec io_iov[SMB2_IOCTL_IOV_SIZE];
3025     struct kvec close_iov[1];
3026     struct smb2_ioctl_rsp *ioctl_rsp;
3027     struct reparse_data_buffer *reparse_buf;
3028     u32 plen;
3029
3030     cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
3031
3032     if (smb3_encryption_required(tcon))
3033         flags |= CIFS_TRANSFORM_REQ;
3034
3035     memset(rqst, 0, sizeof(rqst));
3036     resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
3037     memset(rsp_iov, 0, sizeof(rsp_iov));
3038
3039     utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
3040     if (!utf16_path)
3041         return -ENOMEM;
3042
3043     /*
3044      * setup smb2open - TODO add optimization to call cifs_get_readable_path
3045      * to see if there is a handle already open that we can use
3046      */
3047     memset(&open_iov, 0, sizeof(open_iov));
3048     rqst[0].rq_iov = open_iov;
3049     rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
3050
3051     memset(&oparms, 0, sizeof(oparms));
3052     oparms.tcon = tcon;
3053     oparms.desired_access = FILE_READ_ATTRIBUTES;
3054     oparms.disposition = FILE_OPEN;
3055     oparms.create_options = cifs_create_options(cifs_sb, OPEN_REPARSE_POINT);
3056     oparms.fid = &fid;
3057     oparms.reconnect = false;
3058
3059     rc = SMB2_open_init(tcon, server,
3060                 &rqst[0], &oplock, &oparms, utf16_path);
3061     if (rc)
3062         goto query_rp_exit;
3063     smb2_set_next_command(tcon, &rqst[0]);
3064
3065
3066     /* IOCTL */
3067     memset(&io_iov, 0, sizeof(io_iov));
3068     rqst[1].rq_iov = io_iov;
3069     rqst[1].rq_nvec = SMB2_IOCTL_IOV_SIZE;
3070
3071     rc = SMB2_ioctl_init(tcon, server,
3072                  &rqst[1], COMPOUND_FID,
3073                  COMPOUND_FID, FSCTL_GET_REPARSE_POINT, NULL, 0,
3074                  CIFSMaxBufSize -
3075                  MAX_SMB2_CREATE_RESPONSE_SIZE -
3076                  MAX_SMB2_CLOSE_RESPONSE_SIZE);
3077     if (rc)
3078         goto query_rp_exit;
3079
3080     smb2_set_next_command(tcon, &rqst[1]);
3081     smb2_set_related(&rqst[1]);
3082
3083
3084     /* Close */
3085     memset(&close_iov, 0, sizeof(close_iov));
3086     rqst[2].rq_iov = close_iov;
3087     rqst[2].rq_nvec = 1;
3088
3089     rc = SMB2_close_init(tcon, server,
3090                  &rqst[2], COMPOUND_FID, COMPOUND_FID, false);
3091     if (rc)
3092         goto query_rp_exit;
3093
3094     smb2_set_related(&rqst[2]);
3095
3096     rc = compound_send_recv(xid, tcon->ses, server,
3097                 flags, 3, rqst,
3098                 resp_buftype, rsp_iov);
3099
3100     ioctl_rsp = rsp_iov[1].iov_base;
3101
3102     /*
3103      * Open was successful and we got an ioctl response.
3104      */
3105     if (rc == 0) {
3106         /* See MS-FSCC 2.3.23 */
3107
3108         reparse_buf = (struct reparse_data_buffer *)
3109             ((char *)ioctl_rsp +
3110              le32_to_cpu(ioctl_rsp->OutputOffset));
3111         plen = le32_to_cpu(ioctl_rsp->OutputCount);
3112
3113         if (plen + le32_to_cpu(ioctl_rsp->OutputOffset) >
3114             rsp_iov[1].iov_len) {
3115             cifs_tcon_dbg(FYI, "srv returned invalid ioctl len: %d\n",
3116                  plen);
3117             rc = -EIO;
3118             goto query_rp_exit;
3119         }
3120         *tag = le32_to_cpu(reparse_buf->ReparseTag);
3121     }
3122
3123  query_rp_exit:
3124     kfree(utf16_path);
3125     SMB2_open_free(&rqst[0]);
3126     SMB2_ioctl_free(&rqst[1]);
3127     SMB2_close_free(&rqst[2]);
3128     free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
3129     free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
3130     free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
3131     return rc;
3132 }
3133
3134 static struct cifs_ntsd *
3135 get_smb2_acl_by_fid(struct cifs_sb_info *cifs_sb,
3136             const struct cifs_fid *cifsfid, u32 *pacllen, u32 info)
3137 {
3138     struct cifs_ntsd *pntsd = NULL;
3139     unsigned int xid;
3140     int rc = -EOPNOTSUPP;
3141     struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
3142
3143     if (IS_ERR(tlink))
3144         return ERR_CAST(tlink);
3145
3146     xid = get_xid();
3147     cifs_dbg(FYI, "trying to get acl\n");
3148
3149     rc = SMB2_query_acl(xid, tlink_tcon(tlink), cifsfid->persistent_fid,
3150                 cifsfid->volatile_fid, (void **)&pntsd, pacllen,
3151                 info);
3152     free_xid(xid);
3153
3154     cifs_put_tlink(tlink);
3155
3156     cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen);
3157     if (rc)
3158         return ERR_PTR(rc);
3159     return pntsd;
3160
3161 }
3162
3163 static struct cifs_ntsd *
3164 get_smb2_acl_by_path(struct cifs_sb_info *cifs_sb,
3165              const char *path, u32 *pacllen, u32 info)
3166 {
3167     struct cifs_ntsd *pntsd = NULL;
3168     u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
3169     unsigned int xid;
3170     int rc;
3171     struct cifs_tcon *tcon;
3172     struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
3173     struct cifs_fid fid;
3174     struct cifs_open_parms oparms;
3175     __le16 *utf16_path;
3176
3177     cifs_dbg(FYI, "get smb3 acl for path %s\n", path);
3178     if (IS_ERR(tlink))
3179         return ERR_CAST(tlink);
3180
3181     tcon = tlink_tcon(tlink);
3182     xid = get_xid();
3183
3184     utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
3185     if (!utf16_path) {
3186         rc = -ENOMEM;
3187         free_xid(xid);
3188         return ERR_PTR(rc);
3189     }
3190
3191     oparms.tcon = tcon;
3192     oparms.desired_access = READ_CONTROL;
3193     oparms.disposition = FILE_OPEN;
3194     /*
3195      * When querying an ACL, even if the file is a symlink we want to open
3196      * the source not the target, and so the protocol requires that the
3197      * client specify this flag when opening a reparse point
3198      */
3199     oparms.create_options = cifs_create_options(cifs_sb, 0) | OPEN_REPARSE_POINT;
3200     oparms.fid = &fid;
3201     oparms.reconnect = false;
3202
3203     if (info & SACL_SECINFO)
3204         oparms.desired_access |= SYSTEM_SECURITY;
3205
3206     rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL,
3207                NULL);
3208     kfree(utf16_path);
3209     if (!rc) {
3210         rc = SMB2_query_acl(xid, tlink_tcon(tlink), fid.persistent_fid,
3211                     fid.volatile_fid, (void **)&pntsd, pacllen,
3212                     info);
3213         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
3214     }
3215
3216     cifs_put_tlink(tlink);
3217     free_xid(xid);
3218
3219     cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen);
3220     if (rc)
3221         return ERR_PTR(rc);
3222     return pntsd;
3223 }
3224
3225 static int
3226 set_smb2_acl(struct cifs_ntsd *pnntsd, __u32 acllen,
3227         struct inode *inode, const char *path, int aclflag)
3228 {
3229     u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
3230     unsigned int xid;
3231     int rc, access_flags = 0;
3232     struct cifs_tcon *tcon;
3233     struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
3234     struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
3235     struct cifs_fid fid;
3236     struct cifs_open_parms oparms;
3237     __le16 *utf16_path;
3238
3239     cifs_dbg(FYI, "set smb3 acl for path %s\n", path);
3240     if (IS_ERR(tlink))
3241         return PTR_ERR(tlink);
3242
3243     tcon = tlink_tcon(tlink);
3244     xid = get_xid();
3245
3246     if (aclflag & CIFS_ACL_OWNER || aclflag & CIFS_ACL_GROUP)
3247         access_flags |= WRITE_OWNER;
3248     if (aclflag & CIFS_ACL_SACL)
3249         access_flags |= SYSTEM_SECURITY;
3250     if (aclflag & CIFS_ACL_DACL)
3251         access_flags |= WRITE_DAC;
3252
3253     utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
3254     if (!utf16_path) {
3255         rc = -ENOMEM;
3256         free_xid(xid);
3257         return rc;
3258     }
3259
3260     oparms.tcon = tcon;
3261     oparms.desired_access = access_flags;
3262     oparms.create_options = cifs_create_options(cifs_sb, 0);
3263     oparms.disposition = FILE_OPEN;
3264     oparms.path = path;
3265     oparms.fid = &fid;
3266     oparms.reconnect = false;
3267
3268     rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL,
3269                NULL, NULL);
3270     kfree(utf16_path);
3271     if (!rc) {
3272         rc = SMB2_set_acl(xid, tlink_tcon(tlink), fid.persistent_fid,
3273                 fid.volatile_fid, pnntsd, acllen, aclflag);
3274         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
3275     }
3276
3277     cifs_put_tlink(tlink);
3278     free_xid(xid);
3279     return rc;
3280 }
3281
3282 /* Retrieve an ACL from the server */
3283 static struct cifs_ntsd *
3284 get_smb2_acl(struct cifs_sb_info *cifs_sb,
3285          struct inode *inode, const char *path,
3286          u32 *pacllen, u32 info)
3287 {
3288     struct cifs_ntsd *pntsd = NULL;
3289     struct cifsFileInfo *open_file = NULL;
3290
3291     if (inode && !(info & SACL_SECINFO))
3292         open_file = find_readable_file(CIFS_I(inode), true);
3293     if (!open_file || (info & SACL_SECINFO))
3294         return get_smb2_acl_by_path(cifs_sb, path, pacllen, info);
3295
3296     pntsd = get_smb2_acl_by_fid(cifs_sb, &open_file->fid, pacllen, info);
3297     cifsFileInfo_put(open_file);
3298     return pntsd;
3299 }
3300
3301 static long smb3_zero_data(struct file *file, struct cifs_tcon *tcon,
3302                  loff_t offset, loff_t len, unsigned int xid)
3303 {
3304     struct cifsFileInfo *cfile = file->private_data;
3305     struct file_zero_data_information fsctl_buf;
3306
3307     cifs_dbg(FYI, "Offset %lld len %lld\n", offset, len);
3308
3309     fsctl_buf.FileOffset = cpu_to_le64(offset);
3310     fsctl_buf.BeyondFinalZero = cpu_to_le64(offset + len);
3311
3312     return SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
3313               cfile->fid.volatile_fid, FSCTL_SET_ZERO_DATA,
3314               (char *)&fsctl_buf,
3315               sizeof(struct file_zero_data_information),
3316               0, NULL, NULL);
3317 }
3318
3319 static long smb3_zero_range(struct file *file, struct cifs_tcon *tcon,
3320                 loff_t offset, loff_t len, bool keep_size)
3321 {
3322     struct cifs_ses *ses = tcon->ses;
3323     struct inode *inode = file_inode(file);
3324     struct cifsInodeInfo *cifsi = CIFS_I(inode);
3325     struct cifsFileInfo *cfile = file->private_data;
3326     long rc;
3327     unsigned int xid;
3328     __le64 eof;
3329
3330     xid = get_xid();
3331
3332     trace_smb3_zero_enter(xid, cfile->fid.persistent_fid, tcon->tid,
3333                   ses->Suid, offset, len);
3334
3335     inode_lock(inode);
3336     filemap_invalidate_lock(inode->i_mapping);
3337
3338     /*
3339      * We zero the range through ioctl, so we need remove the page caches
3340      * first, otherwise the data may be inconsistent with the server.
3341      */
3342     truncate_pagecache_range(inode, offset, offset + len - 1);
3343
3344     /* if file not oplocked can't be sure whether asking to extend size */
3345     rc = -EOPNOTSUPP;
3346     if (keep_size == false && !CIFS_CACHE_READ(cifsi))
3347         goto zero_range_exit;
3348
3349     rc = smb3_zero_data(file, tcon, offset, len, xid);
3350     if (rc < 0)
3351         goto zero_range_exit;
3352
3353     /*
3354      * do we also need to change the size of the file?
3355      */
3356     if (keep_size == false && i_size_read(inode) < offset + len) {
3357         eof = cpu_to_le64(offset + len);
3358         rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
3359                   cfile->fid.volatile_fid, cfile->pid, &eof);
3360     }
3361
3362  zero_range_exit:
3363     filemap_invalidate_unlock(inode->i_mapping);
3364     inode_unlock(inode);
3365     free_xid(xid);
3366     if (rc)
3367         trace_smb3_zero_err(xid, cfile->fid.persistent_fid, tcon->tid,
3368                   ses->Suid, offset, len, rc);
3369     else
3370         trace_smb3_zero_done(xid, cfile->fid.persistent_fid, tcon->tid,
3371                   ses->Suid, offset, len);
3372     return rc;
3373 }
3374
3375 static long smb3_punch_hole(struct file *file, struct cifs_tcon *tcon,
3376                 loff_t offset, loff_t len)
3377 {
3378     struct inode *inode = file_inode(file);
3379     struct cifsFileInfo *cfile = file->private_data;
3380     struct file_zero_data_information fsctl_buf;
3381     long rc;
3382     unsigned int xid;
3383     __u8 set_sparse = 1;
3384
3385     xid = get_xid();
3386
3387     inode_lock(inode);
3388     /* Need to make file sparse, if not already, before freeing range. */
3389     /* Consider adding equivalent for compressed since it could also work */
3390     if (!smb2_set_sparse(xid, tcon, cfile, inode, set_sparse)) {
3391         rc = -EOPNOTSUPP;
3392         goto out;
3393     }
3394
3395     filemap_invalidate_lock(inode->i_mapping);
3396     /*
3397      * We implement the punch hole through ioctl, so we need remove the page
3398      * caches first, otherwise the data may be inconsistent with the server.
3399      */
3400     truncate_pagecache_range(inode, offset, offset + len - 1);
3401
3402     cifs_dbg(FYI, "Offset %lld len %lld\n", offset, len);
3403
3404     fsctl_buf.FileOffset = cpu_to_le64(offset);
3405     fsctl_buf.BeyondFinalZero = cpu_to_le64(offset + len);
3406
3407     rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
3408             cfile->fid.volatile_fid, FSCTL_SET_ZERO_DATA,
3409             (char *)&fsctl_buf,
3410             sizeof(struct file_zero_data_information),
3411             CIFSMaxBufSize, NULL, NULL);
3412     filemap_invalidate_unlock(inode->i_mapping);
3413 out:
3414     inode_unlock(inode);
3415     free_xid(xid);
3416     return rc;
3417 }
3418
3419 static int smb3_simple_fallocate_write_range(unsigned int xid,
3420                          struct cifs_tcon *tcon,
3421                          struct cifsFileInfo *cfile,
3422                          loff_t off, loff_t len,
3423                          char *buf)
3424 {
3425     struct cifs_io_parms io_parms = {0};
3426     int nbytes;
3427     int rc = 0;
3428     struct kvec iov[2];
3429
3430     io_parms.netfid = cfile->fid.netfid;
3431     io_parms.pid = current->tgid;
3432     io_parms.tcon = tcon;
3433     io_parms.persistent_fid = cfile->fid.persistent_fid;
3434     io_parms.volatile_fid = cfile->fid.volatile_fid;
3435
3436     while (len) {
3437         io_parms.offset = off;
3438         io_parms.length = len;
3439         if (io_parms.length > SMB2_MAX_BUFFER_SIZE)
3440             io_parms.length = SMB2_MAX_BUFFER_SIZE;
3441         /* iov[0] is reserved for smb header */
3442         iov[1].iov_base = buf;
3443         iov[1].iov_len = io_parms.length;
3444         rc = SMB2_write(xid, &io_parms, &nbytes, iov, 1);
3445         if (rc)
3446             break;
3447         if (nbytes > len)
3448             return -EINVAL;
3449         buf += nbytes;
3450         off += nbytes;
3451         len -= nbytes;
3452     }
3453     return rc;
3454 }
3455
3456 static int smb3_simple_fallocate_range(unsigned int xid,
3457                        struct cifs_tcon *tcon,
3458                        struct cifsFileInfo *cfile,
3459                        loff_t off, loff_t len)
3460 {
3461     struct file_allocated_range_buffer in_data, *out_data = NULL, *tmp_data;
3462     u32 out_data_len;
3463     char *buf = NULL;
3464     loff_t l;
3465     int rc;
3466
3467     in_data.file_offset = cpu_to_le64(off);
3468     in_data.length = cpu_to_le64(len);
3469     rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
3470             cfile->fid.volatile_fid,
3471             FSCTL_QUERY_ALLOCATED_RANGES,
3472             (char *)&in_data, sizeof(in_data),
3473             1024 * sizeof(struct file_allocated_range_buffer),
3474             (char **)&out_data, &out_data_len);
3475     if (rc)
3476         goto out;
3477
3478     buf = kzalloc(1024 * 1024, GFP_KERNEL);
3479     if (buf == NULL) {
3480         rc = -ENOMEM;
3481         goto out;
3482     }
3483
3484     tmp_data = out_data;
3485     while (len) {
3486         /*
3487          * The rest of the region is unmapped so write it all.
3488          */
3489         if (out_data_len == 0) {
3490             rc = smb3_simple_fallocate_write_range(xid, tcon,
3491                            cfile, off, len, buf);
3492             goto out;
3493         }
3494
3495         if (out_data_len < sizeof(struct file_allocated_range_buffer)) {
3496             rc = -EINVAL;
3497             goto out;
3498         }
3499
3500         if (off < le64_to_cpu(tmp_data->file_offset)) {
3501             /*
3502              * We are at a hole. Write until the end of the region
3503              * or until the next allocated data,
3504              * whichever comes next.
3505              */
3506             l = le64_to_cpu(tmp_data->file_offset) - off;
3507             if (len < l)
3508                 l = len;
3509             rc = smb3_simple_fallocate_write_range(xid, tcon,
3510                            cfile, off, l, buf);
3511             if (rc)
3512                 goto out;
3513             off = off + l;
3514             len = len - l;
3515             if (len == 0)
3516                 goto out;
3517         }
3518         /*
3519          * We are at a section of allocated data, just skip forward
3520          * until the end of the data or the end of the region
3521          * we are supposed to fallocate, whichever comes first.
3522          */
3523         l = le64_to_cpu(tmp_data->length);
3524         if (len < l)
3525             l = len;
3526         off += l;
3527         len -= l;
3528
3529         tmp_data = &tmp_data[1];
3530         out_data_len -= sizeof(struct file_allocated_range_buffer);
3531     }
3532
3533  out:
3534     kfree(out_data);
3535     kfree(buf);
3536     return rc;
3537 }
3538
3539
3540 static long smb3_simple_falloc(struct file *file, struct cifs_tcon *tcon,
3541                 loff_t off, loff_t len, bool keep_size)
3542 {
3543     struct inode *inode;
3544     struct cifsInodeInfo *cifsi;
3545     struct cifsFileInfo *cfile = file->private_data;
3546     long rc = -EOPNOTSUPP;
3547     unsigned int xid;
3548     __le64 eof;
3549
3550     xid = get_xid();
3551
3552     inode = d_inode(cfile->dentry);
3553     cifsi = CIFS_I(inode);
3554
3555     trace_smb3_falloc_enter(xid, cfile->fid.persistent_fid, tcon->tid,
3556                 tcon->ses->Suid, off, len);
3557     /* if file not oplocked can't be sure whether asking to extend size */
3558     if (!CIFS_CACHE_READ(cifsi))
3559         if (keep_size == false) {
3560             trace_smb3_falloc_err(xid, cfile->fid.persistent_fid,
3561                 tcon->tid, tcon->ses->Suid, off, len, rc);
3562             free_xid(xid);
3563             return rc;
3564         }
3565
3566     /*
3567      * Extending the file
3568      */
3569     if ((keep_size == false) && i_size_read(inode) < off + len) {
3570         rc = inode_newsize_ok(inode, off + len);
3571         if (rc)
3572             goto out;
3573
3574         if (cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE)
3575             smb2_set_sparse(xid, tcon, cfile, inode, false);
3576
3577         eof = cpu_to_le64(off + len);
3578         rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
3579                   cfile->fid.volatile_fid, cfile->pid, &eof);
3580         if (rc == 0) {
3581             cifsi->server_eof = off + len;
3582             cifs_setsize(inode, off + len);
3583             cifs_truncate_page(inode->i_mapping, inode->i_size);
3584             truncate_setsize(inode, off + len);
3585         }
3586         goto out;
3587     }
3588
3589     /*
3590      * Files are non-sparse by default so falloc may be a no-op
3591      * Must check if file sparse. If not sparse, and since we are not
3592      * extending then no need to do anything since file already allocated
3593      */
3594     if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) == 0) {
3595         rc = 0;
3596         goto out;
3597     }
3598
3599     if (keep_size == true) {
3600         /*
3601          * We can not preallocate pages beyond the end of the file
3602          * in SMB2
3603          */
3604         if (off >= i_size_read(inode)) {
3605             rc = 0;
3606             goto out;
3607         }
3608         /*
3609          * For fallocates that are partially beyond the end of file,
3610          * clamp len so we only fallocate up to the end of file.
3611          */
3612         if (off + len > i_size_read(inode)) {
3613             len = i_size_read(inode) - off;
3614         }
3615     }
3616
3617     if ((keep_size == true) || (i_size_read(inode) >= off + len)) {
3618         /*
3619          * At this point, we are trying to fallocate an internal
3620          * regions of a sparse file. Since smb2 does not have a
3621          * fallocate command we have two otions on how to emulate this.
3622          * We can either turn the entire file to become non-sparse
3623          * which we only do if the fallocate is for virtually
3624          * the whole file,  or we can overwrite the region with zeroes
3625          * using SMB2_write, which could be prohibitevly expensive
3626          * if len is large.
3627          */
3628         /*
3629          * We are only trying to fallocate a small region so
3630          * just write it with zero.
3631          */
3632         if (len <= 1024 * 1024) {
3633             rc = smb3_simple_fallocate_range(xid, tcon, cfile,
3634                              off, len);
3635             goto out;
3636         }
3637
3638         /*
3639          * Check if falloc starts within first few pages of file
3640          * and ends within a few pages of the end of file to
3641          * ensure that most of file is being forced to be
3642          * fallocated now. If so then setting whole file sparse
3643          * ie potentially making a few extra pages at the beginning
3644          * or end of the file non-sparse via set_sparse is harmless.
3645          */
3646         if ((off > 8192) || (off + len + 8192 < i_size_read(inode))) {
3647             rc = -EOPNOTSUPP;
3648             goto out;
3649         }
3650     }
3651
3652     smb2_set_sparse(xid, tcon, cfile, inode, false);
3653     rc = 0;
3654
3655 out:
3656     if (rc)
3657         trace_smb3_falloc_err(xid, cfile->fid.persistent_fid, tcon->tid,
3658                 tcon->ses->Suid, off, len, rc);
3659     else
3660         trace_smb3_falloc_done(xid, cfile->fid.persistent_fid, tcon->tid,
3661                 tcon->ses->Suid, off, len);
3662
3663     free_xid(xid);
3664     return rc;
3665 }
3666
3667 static long smb3_collapse_range(struct file *file, struct cifs_tcon *tcon,
3668                 loff_t off, loff_t len)
3669 {
3670     int rc;
3671     unsigned int xid;
3672     struct inode *inode = file_inode(file);
3673     struct cifsFileInfo *cfile = file->private_data;
3674     struct cifsInodeInfo *cifsi = CIFS_I(inode);
3675     __le64 eof;
3676     loff_t old_eof;
3677
3678     xid = get_xid();
3679
3680     inode_lock(inode);
3681
3682     old_eof = i_size_read(inode);
3683     if ((off >= old_eof) ||
3684         off + len >= old_eof) {
3685         rc = -EINVAL;
3686         goto out;
3687     }
3688
3689     filemap_invalidate_lock(inode->i_mapping);
3690     rc = filemap_write_and_wait_range(inode->i_mapping, off, old_eof - 1);
3691     if (rc < 0)
3692         goto out_2;
3693
3694     truncate_pagecache_range(inode, off, old_eof);
3695
3696     rc = smb2_copychunk_range(xid, cfile, cfile, off + len,
3697                   old_eof - off - len, off);
3698     if (rc < 0)
3699         goto out_2;
3700
3701     eof = cpu_to_le64(old_eof - len);
3702     rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
3703               cfile->fid.volatile_fid, cfile->pid, &eof);
3704     if (rc < 0)
3705         goto out_2;
3706
3707     rc = 0;
3708
3709     cifsi->server_eof = i_size_read(inode) - len;
3710     truncate_setsize(inode, cifsi->server_eof);
3711     fscache_resize_cookie(cifs_inode_cookie(inode), cifsi->server_eof);
3712 out_2:
3713     filemap_invalidate_unlock(inode->i_mapping);
3714  out:
3715     inode_unlock(inode);
3716     free_xid(xid);
3717     return rc;
3718 }
3719
3720 static long smb3_insert_range(struct file *file, struct cifs_tcon *tcon,
3721                   loff_t off, loff_t len)
3722 {
3723     int rc;
3724     unsigned int xid;
3725     struct cifsFileInfo *cfile = file->private_data;
3726     struct inode *inode = file_inode(file);
3727     __le64 eof;
3728     __u64  count, old_eof;
3729
3730     xid = get_xid();
3731
3732     inode_lock(inode);
3733
3734     old_eof = i_size_read(inode);
3735     if (off >= old_eof) {
3736         rc = -EINVAL;
3737         goto out;
3738     }
3739
3740     count = old_eof - off;
3741     eof = cpu_to_le64(old_eof + len);
3742
3743     filemap_invalidate_lock(inode->i_mapping);
3744     rc = filemap_write_and_wait_range(inode->i_mapping, off, old_eof + len - 1);
3745     if (rc < 0)
3746         goto out_2;
3747     truncate_pagecache_range(inode, off, old_eof);
3748
3749     rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
3750               cfile->fid.volatile_fid, cfile->pid, &eof);
3751     if (rc < 0)
3752         goto out_2;
3753
3754     rc = smb2_copychunk_range(xid, cfile, cfile, off, count, off + len);
3755     if (rc < 0)
3756         goto out_2;
3757
3758     rc = smb3_zero_data(file, tcon, off, len, xid);
3759     if (rc < 0)
3760         goto out_2;
3761
3762     rc = 0;
3763 out_2:
3764     filemap_invalidate_unlock(inode->i_mapping);
3765  out:
3766     inode_unlock(inode);
3767     free_xid(xid);
3768     return rc;
3769 }
3770
3771 static loff_t smb3_llseek(struct file *file, struct cifs_tcon *tcon, loff_t offset, int whence)
3772 {
3773     struct cifsFileInfo *wrcfile, *cfile = file->private_data;
3774     struct cifsInodeInfo *cifsi;
3775     struct inode *inode;
3776     int rc = 0;
3777     struct file_allocated_range_buffer in_data, *out_data = NULL;
3778     u32 out_data_len;
3779     unsigned int xid;
3780
3781     if (whence != SEEK_HOLE && whence != SEEK_DATA)
3782         return generic_file_llseek(file, offset, whence);
3783
3784     inode = d_inode(cfile->dentry);
3785     cifsi = CIFS_I(inode);
3786
3787     if (offset < 0 || offset >= i_size_read(inode))
3788         return -ENXIO;
3789
3790     xid = get_xid();
3791     /*
3792      * We need to be sure that all dirty pages are written as they
3793      * might fill holes on the server.
3794      * Note that we also MUST flush any written pages since at least
3795      * some servers (Windows2016) will not reflect recent writes in
3796      * QUERY_ALLOCATED_RANGES until SMB2_flush is called.
3797      */
3798     wrcfile = find_writable_file(cifsi, FIND_WR_ANY);
3799     if (wrcfile) {
3800         filemap_write_and_wait(inode->i_mapping);
3801         smb2_flush_file(xid, tcon, &wrcfile->fid);
3802         cifsFileInfo_put(wrcfile);
3803     }
3804
3805     if (!(cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE)) {
3806         if (whence == SEEK_HOLE)
3807             offset = i_size_read(inode);
3808         goto lseek_exit;
3809     }
3810
3811     in_data.file_offset = cpu_to_le64(offset);
3812     in_data.length = cpu_to_le64(i_size_read(inode));
3813
3814     rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
3815             cfile->fid.volatile_fid,
3816             FSCTL_QUERY_ALLOCATED_RANGES,
3817             (char *)&in_data, sizeof(in_data),
3818             sizeof(struct file_allocated_range_buffer),
3819             (char **)&out_data, &out_data_len);
3820     if (rc == -E2BIG)
3821         rc = 0;
3822     if (rc)
3823         goto lseek_exit;
3824
3825     if (whence == SEEK_HOLE && out_data_len == 0)
3826         goto lseek_exit;
3827
3828     if (whence == SEEK_DATA && out_data_len == 0) {
3829         rc = -ENXIO;
3830         goto lseek_exit;
3831     }
3832
3833     if (out_data_len < sizeof(struct file_allocated_range_buffer)) {
3834         rc = -EINVAL;
3835         goto lseek_exit;
3836     }
3837     if (whence == SEEK_DATA) {
3838         offset = le64_to_cpu(out_data->file_offset);
3839         goto lseek_exit;
3840     }
3841     if (offset < le64_to_cpu(out_data->file_offset))
3842         goto lseek_exit;
3843
3844     offset = le64_to_cpu(out_data->file_offset) + le64_to_cpu(out_data->length);
3845
3846  lseek_exit:
3847     free_xid(xid);
3848     kfree(out_data);
3849     if (!rc)
3850         return vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
3851     else
3852         return rc;
3853 }
3854
3855 static int smb3_fiemap(struct cifs_tcon *tcon,
3856                struct cifsFileInfo *cfile,
3857                struct fiemap_extent_info *fei, u64 start, u64 len)
3858 {
3859     unsigned int xid;
3860     struct file_allocated_range_buffer in_data, *out_data;
3861     u32 out_data_len;
3862     int i, num, rc, flags, last_blob;
3863     u64 next;
3864
3865     rc = fiemap_prep(d_inode(cfile->dentry), fei, start, &len, 0);
3866     if (rc)
3867         return rc;
3868
3869     xid = get_xid();
3870  again:
3871     in_data.file_offset = cpu_to_le64(start);
3872     in_data.length = cpu_to_le64(len);
3873
3874     rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
3875             cfile->fid.volatile_fid,
3876             FSCTL_QUERY_ALLOCATED_RANGES,
3877             (char *)&in_data, sizeof(in_data),
3878             1024 * sizeof(struct file_allocated_range_buffer),
3879             (char **)&out_data, &out_data_len);
3880     if (rc == -E2BIG) {
3881         last_blob = 0;
3882         rc = 0;
3883     } else
3884         last_blob = 1;
3885     if (rc)
3886         goto out;
3887
3888     if (out_data_len && out_data_len < sizeof(struct file_allocated_range_buffer)) {
3889         rc = -EINVAL;
3890         goto out;
3891     }
3892     if (out_data_len % sizeof(struct file_allocated_range_buffer)) {
3893         rc = -EINVAL;
3894         goto out;
3895     }
3896
3897     num = out_data_len / sizeof(struct file_allocated_range_buffer);
3898     for (i = 0; i < num; i++) {
3899         flags = 0;
3900         if (i == num - 1 && last_blob)
3901             flags |= FIEMAP_EXTENT_LAST;
3902
3903         rc = fiemap_fill_next_extent(fei,
3904                 le64_to_cpu(out_data[i].file_offset),
3905                 le64_to_cpu(out_data[i].file_offset),
3906                 le64_to_cpu(out_data[i].length),
3907                 flags);
3908         if (rc < 0)
3909             goto out;
3910         if (rc == 1) {
3911             rc = 0;
3912             goto out;
3913         }
3914     }
3915
3916     if (!last_blob) {
3917         next = le64_to_cpu(out_data[num - 1].file_offset) +
3918           le64_to_cpu(out_data[num - 1].length);
3919         len = len - (next - start);
3920         start = next;
3921         goto again;
3922     }
3923
3924  out:
3925     free_xid(xid);
3926     kfree(out_data);
3927     return rc;
3928 }
3929
3930 static long smb3_fallocate(struct file *file, struct cifs_tcon *tcon, int mode,
3931                loff_t off, loff_t len)
3932 {
3933     /* KEEP_SIZE already checked for by do_fallocate */
3934     if (mode & FALLOC_FL_PUNCH_HOLE)
3935         return smb3_punch_hole(file, tcon, off, len);
3936     else if (mode & FALLOC_FL_ZERO_RANGE) {
3937         if (mode & FALLOC_FL_KEEP_SIZE)
3938             return smb3_zero_range(file, tcon, off, len, true);
3939         return smb3_zero_range(file, tcon, off, len, false);
3940     } else if (mode == FALLOC_FL_KEEP_SIZE)
3941         return smb3_simple_falloc(file, tcon, off, len, true);
3942     else if (mode == FALLOC_FL_COLLAPSE_RANGE)
3943         return smb3_collapse_range(file, tcon, off, len);
3944     else if (mode == FALLOC_FL_INSERT_RANGE)
3945         return smb3_insert_range(file, tcon, off, len);
3946     else if (mode == 0)
3947         return smb3_simple_falloc(file, tcon, off, len, false);
3948
3949     return -EOPNOTSUPP;
3950 }
3951
3952 static void
3953 smb2_downgrade_oplock(struct TCP_Server_Info *server,
3954               struct cifsInodeInfo *cinode, __u32 oplock,
3955               unsigned int epoch, bool *purge_cache)
3956 {
3957     server->ops->set_oplock_level(cinode, oplock, 0, NULL);
3958 }
3959
3960 static void
3961 smb21_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
3962                unsigned int epoch, bool *purge_cache);
3963
3964 static void
3965 smb3_downgrade_oplock(struct TCP_Server_Info *server,
3966                struct cifsInodeInfo *cinode, __u32 oplock,
3967                unsigned int epoch, bool *purge_cache)
3968 {
3969     unsigned int old_state = cinode->oplock;
3970     unsigned int old_epoch = cinode->epoch;
3971     unsigned int new_state;
3972
3973     if (epoch > old_epoch) {
3974         smb21_set_oplock_level(cinode, oplock, 0, NULL);
3975         cinode->epoch = epoch;
3976     }
3977
3978     new_state = cinode->oplock;
3979     *purge_cache = false;
3980
3981     if ((old_state & CIFS_CACHE_READ_FLG) != 0 &&
3982         (new_state & CIFS_CACHE_READ_FLG) == 0)
3983         *purge_cache = true;
3984     else if (old_state == new_state && (epoch - old_epoch > 1))
3985         *purge_cache = true;
3986 }
3987
3988 static void
3989 smb2_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
3990               unsigned int epoch, bool *purge_cache)
3991 {
3992     oplock &= 0xFF;
3993     cinode->lease_granted = false;
3994     if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
3995         return;
3996     if (oplock == SMB2_OPLOCK_LEVEL_BATCH) {
3997         cinode->oplock = CIFS_CACHE_RHW_FLG;
3998         cifs_dbg(FYI, "Batch Oplock granted on inode %p\n",
3999              &cinode->netfs.inode);
4000     } else if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
4001         cinode->oplock = CIFS_CACHE_RW_FLG;
4002         cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n",
4003              &cinode->netfs.inode);
4004     } else if (oplock == SMB2_OPLOCK_LEVEL_II) {
4005         cinode->oplock = CIFS_CACHE_READ_FLG;
4006         cifs_dbg(FYI, "Level II Oplock granted on inode %p\n",
4007              &cinode->netfs.inode);
4008     } else
4009         cinode->oplock = 0;
4010 }
4011
4012 static void
4013 smb21_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
4014                unsigned int epoch, bool *purge_cache)
4015 {
4016     char message[5] = {0};
4017     unsigned int new_oplock = 0;
4018
4019     oplock &= 0xFF;
4020     cinode->lease_granted = true;
4021     if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
4022         return;
4023
4024     /* Check if the server granted an oplock rather than a lease */
4025     if (oplock & SMB2_OPLOCK_LEVEL_EXCLUSIVE)
4026         return smb2_set_oplock_level(cinode, oplock, epoch,
4027                          purge_cache);
4028
4029     if (oplock & SMB2_LEASE_READ_CACHING_HE) {
4030         new_oplock |= CIFS_CACHE_READ_FLG;
4031         strcat(message, "R");
4032     }
4033     if (oplock & SMB2_LEASE_HANDLE_CACHING_HE) {
4034         new_oplock |= CIFS_CACHE_HANDLE_FLG;
4035         strcat(message, "H");
4036     }
4037     if (oplock & SMB2_LEASE_WRITE_CACHING_HE) {
4038         new_oplock |= CIFS_CACHE_WRITE_FLG;
4039         strcat(message, "W");
4040     }
4041     if (!new_oplock)
4042         strncpy(message, "None", sizeof(message));
4043
4044     cinode->oplock = new_oplock;
4045     cifs_dbg(FYI, "%s Lease granted on inode %p\n", message,
4046          &cinode->netfs.inode);
4047 }
4048
4049 static void
4050 smb3_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
4051               unsigned int epoch, bool *purge_cache)
4052 {
4053     unsigned int old_oplock = cinode->oplock;
4054
4055     smb21_set_oplock_level(cinode, oplock, epoch, purge_cache);
4056
4057     if (purge_cache) {
4058         *purge_cache = false;
4059         if (old_oplock == CIFS_CACHE_READ_FLG) {
4060             if (cinode->oplock == CIFS_CACHE_READ_FLG &&
4061                 (epoch - cinode->epoch > 0))
4062                 *purge_cache = true;
4063             else if (cinode->oplock == CIFS_CACHE_RH_FLG &&
4064                  (epoch - cinode->epoch > 1))
4065                 *purge_cache = true;
4066             else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
4067                  (epoch - cinode->epoch > 1))
4068                 *purge_cache = true;
4069             else if (cinode->oplock == 0 &&
4070                  (epoch - cinode->epoch > 0))
4071                 *purge_cache = true;
4072         } else if (old_oplock == CIFS_CACHE_RH_FLG) {
4073             if (cinode->oplock == CIFS_CACHE_RH_FLG &&
4074                 (epoch - cinode->epoch > 0))
4075                 *purge_cache = true;
4076             else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
4077                  (epoch - cinode->epoch > 1))
4078                 *purge_cache = true;
4079         }
4080         cinode->epoch = epoch;
4081     }
4082 }
4083
4084 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
4085 static bool
4086 smb2_is_read_op(__u32 oplock)
4087 {
4088     return oplock == SMB2_OPLOCK_LEVEL_II;
4089 }
4090 #endif /* CIFS_ALLOW_INSECURE_LEGACY */
4091
4092 static bool
4093 smb21_is_read_op(__u32 oplock)
4094 {
4095     return (oplock & SMB2_LEASE_READ_CACHING_HE) &&
4096            !(oplock & SMB2_LEASE_WRITE_CACHING_HE);
4097 }
4098
4099 static __le32
4100 map_oplock_to_lease(u8 oplock)
4101 {
4102     if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
4103         return SMB2_LEASE_WRITE_CACHING_LE | SMB2_LEASE_READ_CACHING_LE;
4104     else if (oplock == SMB2_OPLOCK_LEVEL_II)
4105         return SMB2_LEASE_READ_CACHING_LE;
4106     else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
4107         return SMB2_LEASE_HANDLE_CACHING_LE | SMB2_LEASE_READ_CACHING_LE |
4108                SMB2_LEASE_WRITE_CACHING_LE;
4109     return 0;
4110 }
4111
4112 static char *
4113 smb2_create_lease_buf(u8 *lease_key, u8 oplock)
4114 {
4115     struct create_lease *buf;
4116
4117     buf = kzalloc(sizeof(struct create_lease), GFP_KERNEL);
4118     if (!buf)
4119         return NULL;
4120
4121     memcpy(&buf->lcontext.LeaseKey, lease_key, SMB2_LEASE_KEY_SIZE);
4122     buf->lcontext.LeaseState = map_oplock_to_lease(oplock);
4123
4124     buf->ccontext.DataOffset = cpu_to_le16(offsetof
4125                     (struct create_lease, lcontext));
4126     buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
4127     buf->ccontext.NameOffset = cpu_to_le16(offsetof
4128                 (struct create_lease, Name));
4129     buf->ccontext.NameLength = cpu_to_le16(4);
4130     /* SMB2_CREATE_REQUEST_LEASE is "RqLs" */
4131     buf->Name[0] = 'R';
4132     buf->Name[1] = 'q';
4133     buf->Name[2] = 'L';
4134     buf->Name[3] = 's';
4135     return (char *)buf;
4136 }
4137
4138 static char *
4139 smb3_create_lease_buf(u8 *lease_key, u8 oplock)
4140 {
4141     struct create_lease_v2 *buf;
4142
4143     buf = kzalloc(sizeof(struct create_lease_v2), GFP_KERNEL);
4144     if (!buf)
4145         return NULL;
4146
4147     memcpy(&buf->lcontext.LeaseKey, lease_key, SMB2_LEASE_KEY_SIZE);
4148     buf->lcontext.LeaseState = map_oplock_to_lease(oplock);
4149
4150     buf->ccontext.DataOffset = cpu_to_le16(offsetof
4151                     (struct create_lease_v2, lcontext));
4152     buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context_v2));
4153     buf->ccontext.NameOffset = cpu_to_le16(offsetof
4154                 (struct create_lease_v2, Name));
4155     buf->ccontext.NameLength = cpu_to_le16(4);
4156     /* SMB2_CREATE_REQUEST_LEASE is "RqLs" */
4157     buf->Name[0] = 'R';
4158     buf->Name[1] = 'q';
4159     buf->Name[2] = 'L';
4160     buf->Name[3] = 's';
4161     return (char *)buf;
4162 }
4163
4164 static __u8
4165 smb2_parse_lease_buf(void *buf, unsigned int *epoch, char *lease_key)
4166 {
4167     struct create_lease *lc = (struct create_lease *)buf;
4168
4169     *epoch = 0; /* not used */
4170     if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS_LE)
4171         return SMB2_OPLOCK_LEVEL_NOCHANGE;
4172     return le32_to_cpu(lc->lcontext.LeaseState);
4173 }
4174
4175 static __u8
4176 smb3_parse_lease_buf(void *buf, unsigned int *epoch, char *lease_key)
4177 {
4178     struct create_lease_v2 *lc = (struct create_lease_v2 *)buf;
4179
4180     *epoch = le16_to_cpu(lc->lcontext.Epoch);
4181     if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS_LE)
4182         return SMB2_OPLOCK_LEVEL_NOCHANGE;
4183     if (lease_key)
4184         memcpy(lease_key, &lc->lcontext.LeaseKey, SMB2_LEASE_KEY_SIZE);
4185     return le32_to_cpu(lc->lcontext.LeaseState);
4186 }
4187
4188 static unsigned int
4189 smb2_wp_retry_size(struct inode *inode)
4190 {
4191     return min_t(unsigned int, CIFS_SB(inode->i_sb)->ctx->wsize,
4192              SMB2_MAX_BUFFER_SIZE);
4193 }
4194
4195 static bool
4196 smb2_dir_needs_close(struct cifsFileInfo *cfile)
4197 {
4198     return !cfile->invalidHandle;
4199 }
4200
4201 static void
4202 fill_transform_hdr(struct smb2_transform_hdr *tr_hdr, unsigned int orig_len,
4203            struct smb_rqst *old_rq, __le16 cipher_type)
4204 {
4205     struct smb2_hdr *shdr =
4206             (struct smb2_hdr *)old_rq->rq_iov[0].iov_base;
4207
4208     memset(tr_hdr, 0, sizeof(struct smb2_transform_hdr));
4209     tr_hdr->ProtocolId = SMB2_TRANSFORM_PROTO_NUM;
4210     tr_hdr->OriginalMessageSize = cpu_to_le32(orig_len);
4211     tr_hdr->Flags = cpu_to_le16(0x01);
4212     if ((cipher_type == SMB2_ENCRYPTION_AES128_GCM) ||
4213         (cipher_type == SMB2_ENCRYPTION_AES256_GCM))
4214         get_random_bytes(&tr_hdr->Nonce, SMB3_AES_GCM_NONCE);
4215     else
4216         get_random_bytes(&tr_hdr->Nonce, SMB3_AES_CCM_NONCE);
4217     memcpy(&tr_hdr->SessionId, &shdr->SessionId, 8);
4218 }
4219
4220 /* We can not use the normal sg_set_buf() as we will sometimes pass a
4221  * stack object as buf.
4222  */
4223 static inline void smb2_sg_set_buf(struct scatterlist *sg, const void *buf,
4224                    unsigned int buflen)
4225 {
4226     void *addr;
4227     /*
4228      * VMAP_STACK (at least) puts stack into the vmalloc address space
4229      */
4230     if (is_vmalloc_addr(buf))
4231         addr = vmalloc_to_page(buf);
4232     else
4233         addr = virt_to_page(buf);
4234     sg_set_page(sg, addr, buflen, offset_in_page(buf));
4235 }
4236
4237 /* Assumes the first rqst has a transform header as the first iov.
4238  * I.e.
4239  * rqst[0].rq_iov[0]  is transform header
4240  * rqst[0].rq_iov[1+] data to be encrypted/decrypted
4241  * rqst[1+].rq_iov[0+] data to be encrypted/decrypted
4242  */
4243 static struct scatterlist *
4244 init_sg(int num_rqst, struct smb_rqst *rqst, u8 *sign)
4245 {
4246     unsigned int sg_len;
4247     struct scatterlist *sg;
4248     unsigned int i;
4249     unsigned int j;
4250     unsigned int idx = 0;
4251     int skip;
4252
4253     sg_len = 1;
4254     for (i = 0; i < num_rqst; i++)
4255         sg_len += rqst[i].rq_nvec + rqst[i].rq_npages;
4256
4257     sg = kmalloc_array(sg_len, sizeof(struct scatterlist), GFP_KERNEL);
4258     if (!sg)
4259         return NULL;
4260
4261     sg_init_table(sg, sg_len);
4262     for (i = 0; i < num_rqst; i++) {
4263         for (j = 0; j < rqst[i].rq_nvec; j++) {
4264             /*
4265              * The first rqst has a transform header where the
4266              * first 20 bytes are not part of the encrypted blob
4267              */
4268             skip = (i == 0) && (j == 0) ? 20 : 0;
4269             smb2_sg_set_buf(&sg[idx++],
4270                     rqst[i].rq_iov[j].iov_base + skip,
4271                     rqst[i].rq_iov[j].iov_len - skip);
4272             }
4273
4274         for (j = 0; j < rqst[i].rq_npages; j++) {
4275             unsigned int len, offset;
4276
4277             rqst_page_get_length(&rqst[i], j, &len, &offset);
4278             sg_set_page(&sg[idx++], rqst[i].rq_pages[j], len, offset);
4279         }
4280     }
4281     smb2_sg_set_buf(&sg[idx], sign, SMB2_SIGNATURE_SIZE);
4282     return sg;
4283 }
4284
4285 static int
4286 smb2_get_enc_key(struct TCP_Server_Info *server, __u64 ses_id, int enc, u8 *key)
4287 {
4288     struct cifs_ses *ses;
4289     u8 *ses_enc_key;
4290
4291     spin_lock(&cifs_tcp_ses_lock);
4292     list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
4293         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
4294             if (ses->Suid == ses_id) {
4295                 spin_lock(&ses->ses_lock);
4296                 ses_enc_key = enc ? ses->smb3encryptionkey :
4297                     ses->smb3decryptionkey;
4298                 memcpy(key, ses_enc_key, SMB3_ENC_DEC_KEY_SIZE);
4299                 spin_unlock(&ses->ses_lock);
4300                 spin_unlock(&cifs_tcp_ses_lock);
4301                 return 0;
4302             }
4303         }
4304     }
4305     spin_unlock(&cifs_tcp_ses_lock);
4306
4307     return -EAGAIN;
4308 }
4309 /*
4310  * Encrypt or decrypt @rqst message. @rqst[0] has the following format:
4311  * iov[0]   - transform header (associate data),
4312  * iov[1-N] - SMB2 header and pages - data to encrypt.
4313  * On success return encrypted data in iov[1-N] and pages, leave iov[0]
4314  * untouched.
4315  */
4316 static int
4317 crypt_message(struct TCP_Server_Info *server, int num_rqst,
4318           struct smb_rqst *rqst, int enc)
4319 {
4320     struct smb2_transform_hdr *tr_hdr =
4321         (struct smb2_transform_hdr *)rqst[0].rq_iov[0].iov_base;
4322     unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 20;
4323     int rc = 0;
4324     struct scatterlist *sg;
4325     u8 sign[SMB2_SIGNATURE_SIZE] = {};
4326     u8 key[SMB3_ENC_DEC_KEY_SIZE];
4327     struct aead_request *req;
4328     char *iv;
4329     unsigned int iv_len;
4330     DECLARE_CRYPTO_WAIT(wait);
4331     struct crypto_aead *tfm;
4332     unsigned int crypt_len = le32_to_cpu(tr_hdr->OriginalMessageSize);
4333
4334     rc = smb2_get_enc_key(server, le64_to_cpu(tr_hdr->SessionId), enc, key);
4335     if (rc) {
4336         cifs_server_dbg(VFS, "%s: Could not get %scryption key\n", __func__,
4337              enc ? "en" : "de");
4338         return rc;
4339     }
4340
4341     rc = smb3_crypto_aead_allocate(server);
4342     if (rc) {
4343         cifs_server_dbg(VFS, "%s: crypto alloc failed\n", __func__);
4344         return rc;
4345     }
4346
4347     tfm = enc ? server->secmech.ccmaesencrypt :
4348                         server->secmech.ccmaesdecrypt;
4349
4350     if ((server->cipher_type == SMB2_ENCRYPTION_AES256_CCM) ||
4351         (server->cipher_type == SMB2_ENCRYPTION_AES256_GCM))
4352         rc = crypto_aead_setkey(tfm, key, SMB3_GCM256_CRYPTKEY_SIZE);
4353     else
4354         rc = crypto_aead_setkey(tfm, key, SMB3_GCM128_CRYPTKEY_SIZE);
4355
4356     if (rc) {
4357         cifs_server_dbg(VFS, "%s: Failed to set aead key %d\n", __func__, rc);
4358         return rc;
4359     }
4360
4361     rc = crypto_aead_setauthsize(tfm, SMB2_SIGNATURE_SIZE);
4362     if (rc) {
4363         cifs_server_dbg(VFS, "%s: Failed to set authsize %d\n", __func__, rc);
4364         return rc;
4365     }
4366
4367     req = aead_request_alloc(tfm, GFP_KERNEL);
4368     if (!req) {
4369         cifs_server_dbg(VFS, "%s: Failed to alloc aead request\n", __func__);
4370         return -ENOMEM;
4371     }
4372
4373     if (!enc) {
4374         memcpy(sign, &tr_hdr->Signature, SMB2_SIGNATURE_SIZE);
4375         crypt_len += SMB2_SIGNATURE_SIZE;
4376     }
4377
4378     sg = init_sg(num_rqst, rqst, sign);
4379     if (!sg) {
4380         cifs_server_dbg(VFS, "%s: Failed to init sg\n", __func__);
4381         rc = -ENOMEM;
4382         goto free_req;
4383     }
4384
4385     iv_len = crypto_aead_ivsize(tfm);
4386     iv = kzalloc(iv_len, GFP_KERNEL);
4387     if (!iv) {
4388         cifs_server_dbg(VFS, "%s: Failed to alloc iv\n", __func__);
4389         rc = -ENOMEM;
4390         goto free_sg;
4391     }
4392
4393     if ((server->cipher_type == SMB2_ENCRYPTION_AES128_GCM) ||
4394         (server->cipher_type == SMB2_ENCRYPTION_AES256_GCM))
4395         memcpy(iv, (char *)tr_hdr->Nonce, SMB3_AES_GCM_NONCE);
4396     else {
4397         iv[0] = 3;
4398         memcpy(iv + 1, (char *)tr_hdr->Nonce, SMB3_AES_CCM_NONCE);
4399     }
4400
4401     aead_request_set_crypt(req, sg, sg, crypt_len, iv);
4402     aead_request_set_ad(req, assoc_data_len);
4403
4404     aead_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
4405                   crypto_req_done, &wait);
4406
4407     rc = crypto_wait_req(enc ? crypto_aead_encrypt(req)
4408                 : crypto_aead_decrypt(req), &wait);
4409
4410     if (!rc && enc)
4411         memcpy(&tr_hdr->Signature, sign, SMB2_SIGNATURE_SIZE);
4412
4413     kfree(iv);
4414 free_sg:
4415     kfree(sg);
4416 free_req:
4417     kfree(req);
4418     return rc;
4419 }
4420
4421 void
4422 smb3_free_compound_rqst(int num_rqst, struct smb_rqst *rqst)
4423 {
4424     int i, j;
4425
4426     for (i = 0; i < num_rqst; i++) {
4427         if (rqst[i].rq_pages) {
4428             for (j = rqst[i].rq_npages - 1; j >= 0; j--)
4429                 put_page(rqst[i].rq_pages[j]);
4430             kfree(rqst[i].rq_pages);
4431         }
4432     }
4433 }
4434
4435 /*
4436  * This function will initialize new_rq and encrypt the content.
4437  * The first entry, new_rq[0], only contains a single iov which contains
4438  * a smb2_transform_hdr and is pre-allocated by the caller.
4439  * This function then populates new_rq[1+] with the content from olq_rq[0+].
4440  *
4441  * The end result is an array of smb_rqst structures where the first structure
4442  * only contains a single iov for the transform header which we then can pass
4443  * to crypt_message().
4444  *
4445  * new_rq[0].rq_iov[0] :  smb2_transform_hdr pre-allocated by the caller
4446  * new_rq[1+].rq_iov[*] == old_rq[0+].rq_iov[*] : SMB2/3 requests
4447  */
4448 static int
4449 smb3_init_transform_rq(struct TCP_Server_Info *server, int num_rqst,
4450                struct smb_rqst *new_rq, struct smb_rqst *old_rq)
4451 {
4452     struct page **pages;
4453     struct smb2_transform_hdr *tr_hdr = new_rq[0].rq_iov[0].iov_base;
4454     unsigned int npages;
4455     unsigned int orig_len = 0;
4456     int i, j;
4457     int rc = -ENOMEM;
4458
4459     for (i = 1; i < num_rqst; i++) {
4460         npages = old_rq[i - 1].rq_npages;
4461         pages = kmalloc_array(npages, sizeof(struct page *),
4462                       GFP_KERNEL);
4463         if (!pages)
4464             goto err_free;
4465
4466         new_rq[i].rq_pages = pages;
4467         new_rq[i].rq_npages = npages;
4468         new_rq[i].rq_offset = old_rq[i - 1].rq_offset;
4469         new_rq[i].rq_pagesz = old_rq[i - 1].rq_pagesz;
4470         new_rq[i].rq_tailsz = old_rq[i - 1].rq_tailsz;
4471         new_rq[i].rq_iov = old_rq[i - 1].rq_iov;
4472         new_rq[i].rq_nvec = old_rq[i - 1].rq_nvec;
4473
4474         orig_len += smb_rqst_len(server, &old_rq[i - 1]);
4475
4476         for (j = 0; j < npages; j++) {
4477             pages[j] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
4478             if (!pages[j])
4479                 goto err_free;
4480         }
4481
4482         /* copy pages form the old */
4483         for (j = 0; j < npages; j++) {
4484             char *dst, *src;
4485             unsigned int offset, len;
4486
4487             rqst_page_get_length(&new_rq[i], j, &len, &offset);
4488
4489             dst = (char *) kmap(new_rq[i].rq_pages[j]) + offset;
4490             src = (char *) kmap(old_rq[i - 1].rq_pages[j]) + offset;
4491
4492             memcpy(dst, src, len);
4493             kunmap(new_rq[i].rq_pages[j]);
4494             kunmap(old_rq[i - 1].rq_pages[j]);
4495         }
4496     }
4497
4498     /* fill the 1st iov with a transform header */
4499     fill_transform_hdr(tr_hdr, orig_len, old_rq, server->cipher_type);
4500
4501     rc = crypt_message(server, num_rqst, new_rq, 1);
4502     cifs_dbg(FYI, "Encrypt message returned %d\n", rc);
4503     if (rc)
4504         goto err_free;
4505
4506     return rc;
4507
4508 err_free:
4509     smb3_free_compound_rqst(num_rqst - 1, &new_rq[1]);
4510     return rc;
4511 }
4512
4513 static int
4514 smb3_is_transform_hdr(void *buf)
4515 {
4516     struct smb2_transform_hdr *trhdr = buf;
4517
4518     return trhdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM;
4519 }
4520
4521 static int
4522 decrypt_raw_data(struct TCP_Server_Info *server, char *buf,
4523          unsigned int buf_data_size, struct page **pages,
4524          unsigned int npages, unsigned int page_data_size,
4525          bool is_offloaded)
4526 {
4527     struct kvec iov[2];
4528     struct smb_rqst rqst = {NULL};
4529     int rc;
4530
4531     iov[0].iov_base = buf;
4532     iov[0].iov_len = sizeof(struct smb2_transform_hdr);
4533     iov[1].iov_base = buf + sizeof(struct smb2_transform_hdr);
4534     iov[1].iov_len = buf_data_size;
4535
4536     rqst.rq_iov = iov;
4537     rqst.rq_nvec = 2;
4538     rqst.rq_pages = pages;
4539     rqst.rq_npages = npages;
4540     rqst.rq_pagesz = PAGE_SIZE;
4541     rqst.rq_tailsz = (page_data_size % PAGE_SIZE) ? : PAGE_SIZE;
4542
4543     rc = crypt_message(server, 1, &rqst, 0);
4544     cifs_dbg(FYI, "Decrypt message returned %d\n", rc);
4545
4546     if (rc)
4547         return rc;
4548
4549     memmove(buf, iov[1].iov_base, buf_data_size);
4550
4551     if (!is_offloaded)
4552         server->total_read = buf_data_size + page_data_size;
4553
4554     return rc;
4555 }
4556
4557 static int
4558 read_data_into_pages(struct TCP_Server_Info *server, struct page **pages,
4559              unsigned int npages, unsigned int len)
4560 {
4561     int i;
4562     int length;
4563
4564     for (i = 0; i < npages; i++) {
4565         struct page *page = pages[i];
4566         size_t n;
4567
4568         n = len;
4569         if (len >= PAGE_SIZE) {
4570             /* enough data to fill the page */
4571             n = PAGE_SIZE;
4572             len -= n;
4573         } else {
4574             zero_user(page, len, PAGE_SIZE - len);
4575             len = 0;
4576         }
4577         length = cifs_read_page_from_socket(server, page, 0, n);
4578         if (length < 0)
4579             return length;
4580         server->total_read += length;
4581     }
4582
4583     return 0;
4584 }
4585
4586 static int
4587 init_read_bvec(struct page **pages, unsigned int npages, unsigned int data_size,
4588            unsigned int cur_off, struct bio_vec **page_vec)
4589 {
4590     struct bio_vec *bvec;
4591     int i;
4592
4593     bvec = kcalloc(npages, sizeof(struct bio_vec), GFP_KERNEL);
4594     if (!bvec)
4595         return -ENOMEM;
4596
4597     for (i = 0; i < npages; i++) {
4598         bvec[i].bv_page = pages[i];
4599         bvec[i].bv_offset = (i == 0) ? cur_off : 0;
4600         bvec[i].bv_len = min_t(unsigned int, PAGE_SIZE, data_size);
4601         data_size -= bvec[i].bv_len;
4602     }
4603
4604     if (data_size != 0) {
4605         cifs_dbg(VFS, "%s: something went wrong\n", __func__);
4606         kfree(bvec);
4607         return -EIO;
4608     }
4609
4610     *page_vec = bvec;
4611     return 0;
4612 }
4613
4614 static int
4615 handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid,
4616          char *buf, unsigned int buf_len, struct page **pages,
4617          unsigned int npages, unsigned int page_data_size,
4618          bool is_offloaded)
4619 {
4620     unsigned int data_offset;
4621     unsigned int data_len;
4622     unsigned int cur_off;
4623     unsigned int cur_page_idx;
4624     unsigned int pad_len;
4625     struct cifs_readdata *rdata = mid->callback_data;
4626     struct smb2_hdr *shdr = (struct smb2_hdr *)buf;
4627     struct bio_vec *bvec = NULL;
4628     struct iov_iter iter;
4629     struct kvec iov;
4630     int length;
4631     bool use_rdma_mr = false;
4632
4633     if (shdr->Command != SMB2_READ) {
4634         cifs_server_dbg(VFS, "only big read responses are supported\n");
4635         return -ENOTSUPP;
4636     }
4637
4638     if (server->ops->is_session_expired &&
4639         server->ops->is_session_expired(buf)) {
4640         if (!is_offloaded)
4641             cifs_reconnect(server, true);
4642         return -1;
4643     }
4644
4645     if (server->ops->is_status_pending &&
4646             server->ops->is_status_pending(buf, server))
4647         return -1;
4648
4649     /* set up first two iov to get credits */
4650     rdata->iov[0].iov_base = buf;
4651     rdata->iov[0].iov_len = 0;
4652     rdata->iov[1].iov_base = buf;
4653     rdata->iov[1].iov_len =
4654         min_t(unsigned int, buf_len, server->vals->read_rsp_size);
4655     cifs_dbg(FYI, "0: iov_base=%p iov_len=%zu\n",
4656          rdata->iov[0].iov_base, rdata->iov[0].iov_len);
4657     cifs_dbg(FYI, "1: iov_base=%p iov_len=%zu\n",
4658          rdata->iov[1].iov_base, rdata->iov[1].iov_len);
4659
4660     rdata->result = server->ops->map_error(buf, true);
4661     if (rdata->result != 0) {
4662         cifs_dbg(FYI, "%s: server returned error %d\n",
4663              __func__, rdata->result);
4664         /* normal error on read response */
4665         if (is_offloaded)
4666             mid->mid_state = MID_RESPONSE_RECEIVED;
4667         else
4668             dequeue_mid(mid, false);
4669         return 0;
4670     }
4671
4672     data_offset = server->ops->read_data_offset(buf);
4673 #ifdef CONFIG_CIFS_SMB_DIRECT
4674     use_rdma_mr = rdata->mr;
4675 #endif
4676     data_len = server->ops->read_data_length(buf, use_rdma_mr);
4677
4678     if (data_offset < server->vals->read_rsp_size) {
4679         /*
4680          * win2k8 sometimes sends an offset of 0 when the read
4681          * is beyond the EOF. Treat it as if the data starts just after
4682          * the header.
4683          */
4684         cifs_dbg(FYI, "%s: data offset (%u) inside read response header\n",
4685              __func__, data_offset);
4686         data_offset = server->vals->read_rsp_size;
4687     } else if (data_offset > MAX_CIFS_SMALL_BUFFER_SIZE) {
4688         /* data_offset is beyond the end of smallbuf */
4689         cifs_dbg(FYI, "%s: data offset (%u) beyond end of smallbuf\n",
4690              __func__, data_offset);
4691         rdata->result = -EIO;
4692         if (is_offloaded)
4693             mid->mid_state = MID_RESPONSE_MALFORMED;
4694         else
4695             dequeue_mid(mid, rdata->result);
4696         return 0;
4697     }
4698
4699     pad_len = data_offset - server->vals->read_rsp_size;
4700
4701     if (buf_len <= data_offset) {
4702         /* read response payload is in pages */
4703         cur_page_idx = pad_len / PAGE_SIZE;
4704         cur_off = pad_len % PAGE_SIZE;
4705
4706         if (cur_page_idx != 0) {
4707             /* data offset is beyond the 1st page of response */
4708             cifs_dbg(FYI, "%s: data offset (%u) beyond 1st page of response\n",
4709                  __func__, data_offset);
4710             rdata->result = -EIO;
4711             if (is_offloaded)
4712                 mid->mid_state = MID_RESPONSE_MALFORMED;
4713             else
4714                 dequeue_mid(mid, rdata->result);
4715             return 0;
4716         }
4717
4718         if (data_len > page_data_size - pad_len) {
4719             /* data_len is corrupt -- discard frame */
4720             rdata->result = -EIO;
4721             if (is_offloaded)
4722                 mid->mid_state = MID_RESPONSE_MALFORMED;
4723             else
4724                 dequeue_mid(mid, rdata->result);
4725             return 0;
4726         }
4727
4728         rdata->result = init_read_bvec(pages, npages, page_data_size,
4729                            cur_off, &bvec);
4730         if (rdata->result != 0) {
4731             if (is_offloaded)
4732                 mid->mid_state = MID_RESPONSE_MALFORMED;
4733             else
4734                 dequeue_mid(mid, rdata->result);
4735             return 0;
4736         }
4737
4738         iov_iter_bvec(&iter, WRITE, bvec, npages, data_len);
4739     } else if (buf_len >= data_offset + data_len) {
4740         /* read response payload is in buf */
4741         WARN_ONCE(npages > 0, "read data can be either in buf or in pages");
4742         iov.iov_base = buf + data_offset;
4743         iov.iov_len = data_len;
4744         iov_iter_kvec(&iter, WRITE, &iov, 1, data_len);
4745     } else {
4746         /* read response payload cannot be in both buf and pages */
4747         WARN_ONCE(1, "buf can not contain only a part of read data");
4748         rdata->result = -EIO;
4749         if (is_offloaded)
4750             mid->mid_state = MID_RESPONSE_MALFORMED;
4751         else
4752             dequeue_mid(mid, rdata->result);
4753         return 0;
4754     }
4755
4756     length = rdata->copy_into_pages(server, rdata, &iter);
4757
4758     kfree(bvec);
4759
4760     if (length < 0)
4761         return length;
4762
4763     if (is_offloaded)
4764         mid->mid_state = MID_RESPONSE_RECEIVED;
4765     else
4766         dequeue_mid(mid, false);
4767     return length;
4768 }
4769
4770 struct smb2_decrypt_work {
4771     struct work_struct decrypt;
4772     struct TCP_Server_Info *server;
4773     struct page **ppages;
4774     char *buf;
4775     unsigned int npages;
4776     unsigned int len;
4777 };
4778
4779
4780 static void smb2_decrypt_offload(struct work_struct *work)
4781 {
4782     struct smb2_decrypt_work *dw = container_of(work,
4783                 struct smb2_decrypt_work, decrypt);
4784     int i, rc;
4785     struct mid_q_entry *mid;
4786
4787     rc = decrypt_raw_data(dw->server, dw->buf, dw->server->vals->read_rsp_size,
4788                   dw->ppages, dw->npages, dw->len, true);
4789     if (rc) {
4790         cifs_dbg(VFS, "error decrypting rc=%d\n", rc);
4791         goto free_pages;
4792     }
4793
4794     dw->server->lstrp = jiffies;
4795     mid = smb2_find_dequeue_mid(dw->server, dw->buf);
4796     if (mid == NULL)
4797         cifs_dbg(FYI, "mid not found\n");
4798     else {
4799         mid->decrypted = true;
4800         rc = handle_read_data(dw->server, mid, dw->buf,
4801                       dw->server->vals->read_rsp_size,
4802                       dw->ppages, dw->npages, dw->len,
4803                       true);
4804         if (rc >= 0) {
4805 #ifdef CONFIG_CIFS_STATS2
4806             mid->when_received = jiffies;
4807 #endif
4808             if (dw->server->ops->is_network_name_deleted)
4809                 dw->server->ops->is_network_name_deleted(dw->buf,
4810                                      dw->server);
4811
4812             mid->callback(mid);
4813         } else {
4814             spin_lock(&dw->server->srv_lock);
4815             if (dw->server->tcpStatus == CifsNeedReconnect) {
4816                 spin_lock(&dw->server->mid_lock);
4817                 mid->mid_state = MID_RETRY_NEEDED;
4818                 spin_unlock(&dw->server->mid_lock);
4819                 spin_unlock(&dw->server->srv_lock);
4820                 mid->callback(mid);
4821             } else {
4822                 spin_lock(&dw->server->mid_lock);
4823                 mid->mid_state = MID_REQUEST_SUBMITTED;
4824                 mid->mid_flags &= ~(MID_DELETED);
4825                 list_add_tail(&mid->qhead,
4826                     &dw->server->pending_mid_q);
4827                 spin_unlock(&dw->server->mid_lock);
4828                 spin_unlock(&dw->server->srv_lock);
4829             }
4830         }
4831         release_mid(mid);
4832     }
4833
4834 free_pages:
4835     for (i = dw->npages-1; i >= 0; i--)
4836         put_page(dw->ppages[i]);
4837
4838     kfree(dw->ppages);
4839     cifs_small_buf_release(dw->buf);
4840     kfree(dw);
4841 }
4842
4843
4844 static int
4845 receive_encrypted_read(struct TCP_Server_Info *server, struct mid_q_entry **mid,
4846                int *num_mids)
4847 {
4848     char *buf = server->smallbuf;
4849     struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)buf;
4850     unsigned int npages;
4851     struct page **pages;
4852     unsigned int len;
4853     unsigned int buflen = server->pdu_size;
4854     int rc;
4855     int i = 0;
4856     struct smb2_decrypt_work *dw;
4857
4858     *num_mids = 1;
4859     len = min_t(unsigned int, buflen, server->vals->read_rsp_size +
4860         sizeof(struct smb2_transform_hdr)) - HEADER_SIZE(server) + 1;
4861
4862     rc = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1, len);
4863     if (rc < 0)
4864         return rc;
4865     server->total_read += rc;
4866
4867     len = le32_to_cpu(tr_hdr->OriginalMessageSize) -
4868         server->vals->read_rsp_size;
4869     npages = DIV_ROUND_UP(len, PAGE_SIZE);
4870
4871     pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
4872     if (!pages) {
4873         rc = -ENOMEM;
4874         goto discard_data;
4875     }
4876
4877     for (; i < npages; i++) {
4878         pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
4879         if (!pages[i]) {
4880             rc = -ENOMEM;
4881             goto discard_data;
4882         }
4883     }
4884
4885     /* read read data into pages */
4886     rc = read_data_into_pages(server, pages, npages, len);
4887     if (rc)
4888         goto free_pages;
4889
4890     rc = cifs_discard_remaining_data(server);
4891     if (rc)
4892         goto free_pages;
4893
4894     /*
4895      * For large reads, offload to different thread for better performance,
4896      * use more cores decrypting which can be expensive
4897      */
4898
4899     if ((server->min_offload) && (server->in_flight > 1) &&
4900         (server->pdu_size >= server->min_offload)) {
4901         dw = kmalloc(sizeof(struct smb2_decrypt_work), GFP_KERNEL);
4902         if (dw == NULL)
4903             goto non_offloaded_decrypt;
4904
4905         dw->buf = server->smallbuf;
4906         server->smallbuf = (char *)cifs_small_buf_get();
4907
4908         INIT_WORK(&dw->decrypt, smb2_decrypt_offload);
4909
4910         dw->npages = npages;
4911         dw->server = server;
4912         dw->ppages = pages;
4913         dw->len = len;
4914         queue_work(decrypt_wq, &dw->decrypt);
4915         *num_mids = 0; /* worker thread takes care of finding mid */
4916         return -1;
4917     }
4918
4919 non_offloaded_decrypt:
4920     rc = decrypt_raw_data(server, buf, server->vals->read_rsp_size,
4921                   pages, npages, len, false);
4922     if (rc)
4923         goto free_pages;
4924
4925     *mid = smb2_find_mid(server, buf);
4926     if (*mid == NULL)
4927         cifs_dbg(FYI, "mid not found\n");
4928     else {
4929         cifs_dbg(FYI, "mid found\n");
4930         (*mid)->decrypted = true;
4931         rc = handle_read_data(server, *mid, buf,
4932                       server->vals->read_rsp_size,
4933                       pages, npages, len, false);
4934         if (rc >= 0) {
4935             if (server->ops->is_network_name_deleted) {
4936                 server->ops->is_network_name_deleted(buf,
4937                                 server);
4938             }
4939         }
4940     }
4941
4942 free_pages:
4943     for (i = i - 1; i >= 0; i--)
4944         put_page(pages[i]);
4945     kfree(pages);
4946     return rc;
4947 discard_data:
4948     cifs_discard_remaining_data(server);
4949     goto free_pages;
4950 }
4951
4952 static int
4953 receive_encrypted_standard(struct TCP_Server_Info *server,
4954                struct mid_q_entry **mids, char **bufs,
4955                int *num_mids)
4956 {
4957     int ret, length;
4958     char *buf = server->smallbuf;
4959     struct smb2_hdr *shdr;
4960     unsigned int pdu_length = server->pdu_size;
4961     unsigned int buf_size;
4962     struct mid_q_entry *mid_entry;
4963     int next_is_large;
4964     char *next_buffer = NULL;
4965
4966     *num_mids = 0;
4967
4968     /* switch to large buffer if too big for a small one */
4969     if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE) {
4970         server->large_buf = true;
4971         memcpy(server->bigbuf, buf, server->total_read);
4972         buf = server->bigbuf;
4973     }
4974
4975     /* now read the rest */
4976     length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
4977                 pdu_length - HEADER_SIZE(server) + 1);
4978     if (length < 0)
4979         return length;
4980     server->total_read += length;
4981
4982     buf_size = pdu_length - sizeof(struct smb2_transform_hdr);
4983     length = decrypt_raw_data(server, buf, buf_size, NULL, 0, 0, false);
4984     if (length)
4985         return length;
4986
4987     next_is_large = server->large_buf;
4988 one_more:
4989     shdr = (struct smb2_hdr *)buf;
4990     if (shdr->NextCommand) {
4991         if (next_is_large)
4992             next_buffer = (char *)cifs_buf_get();
4993         else
4994             next_buffer = (char *)cifs_small_buf_get();
4995         memcpy(next_buffer,
4996                buf + le32_to_cpu(shdr->NextCommand),
4997                pdu_length - le32_to_cpu(shdr->NextCommand));
4998     }
4999
5000     mid_entry = smb2_find_mid(server, buf);
5001     if (mid_entry == NULL)
5002         cifs_dbg(FYI, "mid not found\n");
5003     else {
5004         cifs_dbg(FYI, "mid found\n");
5005         mid_entry->decrypted = true;
5006         mid_entry->resp_buf_size = server->pdu_size;
5007     }
5008
5009     if (*num_mids >= MAX_COMPOUND) {
5010         cifs_server_dbg(VFS, "too many PDUs in compound\n");
5011         return -1;
5012     }
5013     bufs[*num_mids] = buf;
5014     mids[(*num_mids)++] = mid_entry;
5015
5016     if (mid_entry && mid_entry->handle)
5017         ret = mid_entry->handle(server, mid_entry);
5018     else
5019         ret = cifs_handle_standard(server, mid_entry);
5020
5021     if (ret == 0 && shdr->NextCommand) {
5022         pdu_length -= le32_to_cpu(shdr->NextCommand);
5023         server->large_buf = next_is_large;
5024         if (next_is_large)
5025             server->bigbuf = buf = next_buffer;
5026         else
5027             server->smallbuf = buf = next_buffer;
5028         goto one_more;
5029     } else if (ret != 0) {
5030         /*
5031          * ret != 0 here means that we didn't get to handle_mid() thus
5032          * server->smallbuf and server->bigbuf are still valid. We need
5033          * to free next_buffer because it is not going to be used
5034          * anywhere.
5035          */
5036         if (next_is_large)
5037             free_rsp_buf(CIFS_LARGE_BUFFER, next_buffer);
5038         else
5039             free_rsp_buf(CIFS_SMALL_BUFFER, next_buffer);
5040     }
5041
5042     return ret;
5043 }
5044
5045 static int
5046 smb3_receive_transform(struct TCP_Server_Info *server,
5047                struct mid_q_entry **mids, char **bufs, int *num_mids)
5048 {
5049     char *buf = server->smallbuf;
5050     unsigned int pdu_length = server->pdu_size;
5051     struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)buf;
5052     unsigned int orig_len = le32_to_cpu(tr_hdr->OriginalMessageSize);
5053
5054     if (pdu_length < sizeof(struct smb2_transform_hdr) +
5055                         sizeof(struct smb2_hdr)) {
5056         cifs_server_dbg(VFS, "Transform message is too small (%u)\n",
5057              pdu_length);
5058         cifs_reconnect(server, true);
5059         return -ECONNABORTED;
5060     }
5061
5062     if (pdu_length < orig_len + sizeof(struct smb2_transform_hdr)) {
5063         cifs_server_dbg(VFS, "Transform message is broken\n");
5064         cifs_reconnect(server, true);
5065         return -ECONNABORTED;
5066     }
5067
5068     /* TODO: add support for compounds containing READ. */
5069     if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server)) {
5070         return receive_encrypted_read(server, &mids[0], num_mids);
5071     }
5072
5073     return receive_encrypted_standard(server, mids, bufs, num_mids);
5074 }
5075
5076 int
5077 smb3_handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid)
5078 {
5079     char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
5080
5081     return handle_read_data(server, mid, buf, server->pdu_size,
5082                 NULL, 0, 0, false);
5083 }
5084
5085 static int
5086 smb2_next_header(char *buf)
5087 {
5088     struct smb2_hdr *hdr = (struct smb2_hdr *)buf;
5089     struct smb2_transform_hdr *t_hdr = (struct smb2_transform_hdr *)buf;
5090
5091     if (hdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM)
5092         return sizeof(struct smb2_transform_hdr) +
5093           le32_to_cpu(t_hdr->OriginalMessageSize);
5094
5095     return le32_to_cpu(hdr->NextCommand);
5096 }
5097
5098 static int
5099 smb2_make_node(unsigned int xid, struct inode *inode,
5100            struct dentry *dentry, struct cifs_tcon *tcon,
5101            const char *full_path, umode_t mode, dev_t dev)
5102 {
5103     struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
5104     int rc = -EPERM;
5105     FILE_ALL_INFO *buf = NULL;
5106     struct cifs_io_parms io_parms = {0};
5107     __u32 oplock = 0;
5108     struct cifs_fid fid;
5109     struct cifs_open_parms oparms;
5110     unsigned int bytes_written;
5111     struct win_dev *pdev;
5112     struct kvec iov[2];
5113
5114     /*
5115      * Check if mounted with mount parm 'sfu' mount parm.
5116      * SFU emulation should work with all servers, but only
5117      * supports block and char device (no socket & fifo),
5118      * and was used by default in earlier versions of Windows
5119      */
5120     if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
5121         goto out;
5122
5123     /*
5124      * TODO: Add ability to create instead via reparse point. Windows (e.g.
5125      * their current NFS server) uses this approach to expose special files
5126      * over SMB2/SMB3 and Samba will do this with SMB3.1.1 POSIX Extensions
5127      */
5128
5129     if (!S_ISCHR(mode) && !S_ISBLK(mode))
5130         goto out;
5131
5132     cifs_dbg(FYI, "sfu compat create special file\n");
5133
5134     buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
5135     if (buf == NULL) {
5136         rc = -ENOMEM;
5137         goto out;
5138     }
5139
5140     oparms.tcon = tcon;
5141     oparms.cifs_sb = cifs_sb;
5142     oparms.desired_access = GENERIC_WRITE;
5143     oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR |
5144                             CREATE_OPTION_SPECIAL);
5145     oparms.disposition = FILE_CREATE;
5146     oparms.path = full_path;
5147     oparms.fid = &fid;
5148     oparms.reconnect = false;
5149
5150     if (tcon->ses->server->oplocks)
5151         oplock = REQ_OPLOCK;
5152     else
5153         oplock = 0;
5154     rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, buf);
5155     if (rc)
5156         goto out;
5157
5158     /*
5159      * BB Do not bother to decode buf since no local inode yet to put
5160      * timestamps in, but we can reuse it safely.
5161      */
5162
5163     pdev = (struct win_dev *)buf;
5164     io_parms.pid = current->tgid;
5165     io_parms.tcon = tcon;
5166     io_parms.offset = 0;
5167     io_parms.length = sizeof(struct win_dev);
5168     iov[1].iov_base = buf;
5169     iov[1].iov_len = sizeof(struct win_dev);
5170     if (S_ISCHR(mode)) {
5171         memcpy(pdev->type, "IntxCHR", 8);
5172         pdev->major = cpu_to_le64(MAJOR(dev));
5173         pdev->minor = cpu_to_le64(MINOR(dev));
5174         rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
5175                             &bytes_written, iov, 1);
5176     } else if (S_ISBLK(mode)) {
5177         memcpy(pdev->type, "IntxBLK", 8);
5178         pdev->major = cpu_to_le64(MAJOR(dev));
5179         pdev->minor = cpu_to_le64(MINOR(dev));
5180         rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
5181                             &bytes_written, iov, 1);
5182     }
5183     tcon->ses->server->ops->close(xid, tcon, &fid);
5184     d_drop(dentry);
5185
5186     /* FIXME: add code here to set EAs */
5187 out:
5188     kfree(buf);
5189     return rc;
5190 }
5191
5192 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
5193 struct smb_version_operations smb20_operations = {
5194     .compare_fids = smb2_compare_fids,
5195     .setup_request = smb2_setup_request,
5196     .setup_async_request = smb2_setup_async_request,
5197     .check_receive = smb2_check_receive,
5198     .add_credits = smb2_add_credits,
5199     .set_credits = smb2_set_credits,
5200     .get_credits_field = smb2_get_credits_field,
5201     .get_credits = smb2_get_credits,
5202     .wait_mtu_credits = cifs_wait_mtu_credits,
5203     .get_next_mid = smb2_get_next_mid,
5204     .revert_current_mid = smb2_revert_current_mid,
5205     .read_data_offset = smb2_read_data_offset,
5206     .read_data_length = smb2_read_data_length,
5207     .map_error = map_smb2_to_linux_error,
5208     .find_mid = smb2_find_mid,
5209     .check_message = smb2_check_message,
5210     .dump_detail = smb2_dump_detail,
5211     .clear_stats = smb2_clear_stats,
5212     .print_stats = smb2_print_stats,
5213     .is_oplock_break = smb2_is_valid_oplock_break,
5214     .handle_cancelled_mid = smb2_handle_cancelled_mid,
5215     .downgrade_oplock = smb2_downgrade_oplock,
5216     .need_neg = smb2_need_neg,
5217     .negotiate = smb2_negotiate,
5218     .negotiate_wsize = smb2_negotiate_wsize,
5219     .negotiate_rsize = smb2_negotiate_rsize,
5220     .sess_setup = SMB2_sess_setup,
5221     .logoff = SMB2_logoff,
5222     .tree_connect = SMB2_tcon,
5223     .tree_disconnect = SMB2_tdis,
5224     .qfs_tcon = smb2_qfs_tcon,
5225     .is_path_accessible = smb2_is_path_accessible,
5226     .can_echo = smb2_can_echo,
5227     .echo = SMB2_echo,
5228     .query_path_info = smb2_query_path_info,
5229     .get_srv_inum = smb2_get_srv_inum,
5230     .query_file_info = smb2_query_file_info,
5231     .set_path_size = smb2_set_path_size,
5232     .set_file_size = smb2_set_file_size,
5233     .set_file_info = smb2_set_file_info,
5234     .set_compression = smb2_set_compression,
5235     .mkdir = smb2_mkdir,
5236     .mkdir_setinfo = smb2_mkdir_setinfo,
5237     .rmdir = smb2_rmdir,
5238     .unlink = smb2_unlink,
5239     .rename = smb2_rename_path,
5240     .create_hardlink = smb2_create_hardlink,
5241     .query_symlink = smb2_query_symlink,
5242     .query_mf_symlink = smb3_query_mf_symlink,
5243     .create_mf_symlink = smb3_create_mf_symlink,
5244     .open = smb2_open_file,
5245     .set_fid = smb2_set_fid,
5246     .close = smb2_close_file,
5247     .flush = smb2_flush_file,
5248     .async_readv = smb2_async_readv,
5249     .async_writev = smb2_async_writev,
5250     .sync_read = smb2_sync_read,
5251     .sync_write = smb2_sync_write,
5252     .query_dir_first = smb2_query_dir_first,
5253     .query_dir_next = smb2_query_dir_next,
5254     .close_dir = smb2_close_dir,
5255     .calc_smb_size = smb2_calc_size,
5256     .is_status_pending = smb2_is_status_pending,
5257     .is_session_expired = smb2_is_session_expired,
5258     .oplock_response = smb2_oplock_response,
5259     .queryfs = smb2_queryfs,
5260     .mand_lock = smb2_mand_lock,
5261     .mand_unlock_range = smb2_unlock_range,
5262     .push_mand_locks = smb2_push_mandatory_locks,
5263     .get_lease_key = smb2_get_lease_key,
5264     .set_lease_key = smb2_set_lease_key,
5265     .new_lease_key = smb2_new_lease_key,
5266     .calc_signature = smb2_calc_signature,
5267     .is_read_op = smb2_is_read_op,
5268     .set_oplock_level = smb2_set_oplock_level,
5269     .create_lease_buf = smb2_create_lease_buf,
5270     .parse_lease_buf = smb2_parse_lease_buf,
5271     .copychunk_range = smb2_copychunk_range,
5272     .wp_retry_size = smb2_wp_retry_size,
5273     .dir_needs_close = smb2_dir_needs_close,
5274     .get_dfs_refer = smb2_get_dfs_refer,
5275     .select_sectype = smb2_select_sectype,
5276 #ifdef CONFIG_CIFS_XATTR
5277     .query_all_EAs = smb2_query_eas,
5278     .set_EA = smb2_set_ea,
5279 #endif /* CIFS_XATTR */
5280     .get_acl = get_smb2_acl,
5281     .get_acl_by_fid = get_smb2_acl_by_fid,
5282     .set_acl = set_smb2_acl,
5283     .next_header = smb2_next_header,
5284     .ioctl_query_info = smb2_ioctl_query_info,
5285     .make_node = smb2_make_node,
5286     .fiemap = smb3_fiemap,
5287     .llseek = smb3_llseek,
5288     .is_status_io_timeout = smb2_is_status_io_timeout,
5289     .is_network_name_deleted = smb2_is_network_name_deleted,
5290 };
5291 #endif /* CIFS_ALLOW_INSECURE_LEGACY */
5292
5293 struct smb_version_operations smb21_operations = {
5294     .compare_fids = smb2_compare_fids,
5295     .setup_request = smb2_setup_request,
5296     .setup_async_request = smb2_setup_async_request,
5297     .check_receive = smb2_check_receive,
5298     .add_credits = smb2_add_credits,
5299     .set_credits = smb2_set_credits,
5300     .get_credits_field = smb2_get_credits_field,
5301     .get_credits = smb2_get_credits,
5302     .wait_mtu_credits = smb2_wait_mtu_credits,
5303     .adjust_credits = smb2_adjust_credits,
5304     .get_next_mid = smb2_get_next_mid,
5305     .revert_current_mid = smb2_revert_current_mid,
5306     .read_data_offset = smb2_read_data_offset,
5307     .read_data_length = smb2_read_data_length,
5308     .map_error = map_smb2_to_linux_error,
5309     .find_mid = smb2_find_mid,
5310     .check_message = smb2_check_message,
5311     .dump_detail = smb2_dump_detail,
5312     .clear_stats = smb2_clear_stats,
5313     .print_stats = smb2_print_stats,
5314     .is_oplock_break = smb2_is_valid_oplock_break,
5315     .handle_cancelled_mid = smb2_handle_cancelled_mid,
5316     .downgrade_oplock = smb2_downgrade_oplock,
5317     .need_neg = smb2_need_neg,
5318     .negotiate = smb2_negotiate,
5319     .negotiate_wsize = smb2_negotiate_wsize,
5320     .negotiate_rsize = smb2_negotiate_rsize,
5321     .sess_setup = SMB2_sess_setup,
5322     .logoff = SMB2_logoff,
5323     .tree_connect = SMB2_tcon,
5324     .tree_disconnect = SMB2_tdis,
5325     .qfs_tcon = smb2_qfs_tcon,
5326     .is_path_accessible = smb2_is_path_accessible,
5327     .can_echo = smb2_can_echo,
5328     .echo = SMB2_echo,
5329     .query_path_info = smb2_query_path_info,
5330     .get_srv_inum = smb2_get_srv_inum,
5331     .query_file_info = smb2_query_file_info,
5332     .set_path_size = smb2_set_path_size,
5333     .set_file_size = smb2_set_file_size,
5334     .set_file_info = smb2_set_file_info,
5335     .set_compression = smb2_set_compression,
5336     .mkdir = smb2_mkdir,
5337     .mkdir_setinfo = smb2_mkdir_setinfo,
5338     .rmdir = smb2_rmdir,
5339     .unlink = smb2_unlink,
5340     .rename = smb2_rename_path,
5341     .create_hardlink = smb2_create_hardlink,
5342     .query_symlink = smb2_query_symlink,
5343     .query_mf_symlink = smb3_query_mf_symlink,
5344     .create_mf_symlink = smb3_create_mf_symlink,
5345     .open = smb2_open_file,
5346     .set_fid = smb2_set_fid,
5347     .close = smb2_close_file,
5348     .flush = smb2_flush_file,
5349     .async_readv = smb2_async_readv,
5350     .async_writev = smb2_async_writev,
5351     .sync_read = smb2_sync_read,
5352     .sync_write = smb2_sync_write,
5353     .query_dir_first = smb2_query_dir_first,
5354     .query_dir_next = smb2_query_dir_next,
5355     .close_dir = smb2_close_dir,
5356     .calc_smb_size = smb2_calc_size,
5357     .is_status_pending = smb2_is_status_pending,
5358     .is_session_expired = smb2_is_session_expired,
5359     .oplock_response = smb2_oplock_response,
5360     .queryfs = smb2_queryfs,
5361     .mand_lock = smb2_mand_lock,
5362     .mand_unlock_range = smb2_unlock_range,
5363     .push_mand_locks = smb2_push_mandatory_locks,
5364     .get_lease_key = smb2_get_lease_key,
5365     .set_lease_key = smb2_set_lease_key,
5366     .new_lease_key = smb2_new_lease_key,
5367     .calc_signature = smb2_calc_signature,
5368     .is_read_op = smb21_is_read_op,
5369     .set_oplock_level = smb21_set_oplock_level,
5370     .create_lease_buf = smb2_create_lease_buf,
5371     .parse_lease_buf = smb2_parse_lease_buf,
5372     .copychunk_range = smb2_copychunk_range,
5373     .wp_retry_size = smb2_wp_retry_size,
5374     .dir_needs_close = smb2_dir_needs_close,
5375     .enum_snapshots = smb3_enum_snapshots,
5376     .notify = smb3_notify,
5377     .get_dfs_refer = smb2_get_dfs_refer,
5378     .select_sectype = smb2_select_sectype,
5379 #ifdef CONFIG_CIFS_XATTR
5380     .query_all_EAs = smb2_query_eas,
5381     .set_EA = smb2_set_ea,
5382 #endif /* CIFS_XATTR */
5383     .get_acl = get_smb2_acl,
5384     .get_acl_by_fid = get_smb2_acl_by_fid,
5385     .set_acl = set_smb2_acl,
5386     .next_header = smb2_next_header,
5387     .ioctl_query_info = smb2_ioctl_query_info,
5388     .make_node = smb2_make_node,
5389     .fiemap = smb3_fiemap,
5390     .llseek = smb3_llseek,
5391     .is_status_io_timeout = smb2_is_status_io_timeout,
5392     .is_network_name_deleted = smb2_is_network_name_deleted,
5393 };
5394
5395 struct smb_version_operations smb30_operations = {
5396     .compare_fids = smb2_compare_fids,
5397     .setup_request = smb2_setup_request,
5398     .setup_async_request = smb2_setup_async_request,
5399     .check_receive = smb2_check_receive,
5400     .add_credits = smb2_add_credits,
5401     .set_credits = smb2_set_credits,
5402     .get_credits_field = smb2_get_credits_field,
5403     .get_credits = smb2_get_credits,
5404     .wait_mtu_credits = smb2_wait_mtu_credits,
5405     .adjust_credits = smb2_adjust_credits,
5406     .get_next_mid = smb2_get_next_mid,
5407     .revert_current_mid = smb2_revert_current_mid,
5408     .read_data_offset = smb2_read_data_offset,
5409     .read_data_length = smb2_read_data_length,
5410     .map_error = map_smb2_to_linux_error,
5411     .find_mid = smb2_find_mid,
5412     .check_message = smb2_check_message,
5413     .dump_detail = smb2_dump_detail,
5414     .clear_stats = smb2_clear_stats,
5415     .print_stats = smb2_print_stats,
5416     .dump_share_caps = smb2_dump_share_caps,
5417     .is_oplock_break = smb2_is_valid_oplock_break,
5418     .handle_cancelled_mid = smb2_handle_cancelled_mid,
5419     .downgrade_oplock = smb3_downgrade_oplock,
5420     .need_neg = smb2_need_neg,
5421     .negotiate = smb2_negotiate,
5422     .negotiate_wsize = smb3_negotiate_wsize,
5423     .negotiate_rsize = smb3_negotiate_rsize,
5424     .sess_setup = SMB2_sess_setup,
5425     .logoff = SMB2_logoff,
5426     .tree_connect = SMB2_tcon,
5427     .tree_disconnect = SMB2_tdis,
5428     .qfs_tcon = smb3_qfs_tcon,
5429     .is_path_accessible = smb2_is_path_accessible,
5430     .can_echo = smb2_can_echo,
5431     .echo = SMB2_echo,
5432     .query_path_info = smb2_query_path_info,
5433     /* WSL tags introduced long after smb2.1, enable for SMB3, 3.11 only */
5434     .query_reparse_tag = smb2_query_reparse_tag,
5435     .get_srv_inum = smb2_get_srv_inum,
5436     .query_file_info = smb2_query_file_info,
5437     .set_path_size = smb2_set_path_size,
5438     .set_file_size = smb2_set_file_size,
5439     .set_file_info = smb2_set_file_info,
5440     .set_compression = smb2_set_compression,
5441     .mkdir = smb2_mkdir,
5442     .mkdir_setinfo = smb2_mkdir_setinfo,
5443     .rmdir = smb2_rmdir,
5444     .unlink = smb2_unlink,
5445     .rename = smb2_rename_path,
5446     .create_hardlink = smb2_create_hardlink,
5447     .query_symlink = smb2_query_symlink,
5448     .query_mf_symlink = smb3_query_mf_symlink,
5449     .create_mf_symlink = smb3_create_mf_symlink,
5450     .open = smb2_open_file,
5451     .set_fid = smb2_set_fid,
5452     .close = smb2_close_file,
5453     .close_getattr = smb2_close_getattr,
5454     .flush = smb2_flush_file,
5455     .async_readv = smb2_async_readv,
5456     .async_writev = smb2_async_writev,
5457     .sync_read = smb2_sync_read,
5458     .sync_write = smb2_sync_write,
5459     .query_dir_first = smb2_query_dir_first,
5460     .query_dir_next = smb2_query_dir_next,
5461     .close_dir = smb2_close_dir,
5462     .calc_smb_size = smb2_calc_size,
5463     .is_status_pending = smb2_is_status_pending,
5464     .is_session_expired = smb2_is_session_expired,
5465     .oplock_response = smb2_oplock_response,
5466     .queryfs = smb2_queryfs,
5467     .mand_lock = smb2_mand_lock,
5468     .mand_unlock_range = smb2_unlock_range,
5469     .push_mand_locks = smb2_push_mandatory_locks,
5470     .get_lease_key = smb2_get_lease_key,
5471     .set_lease_key = smb2_set_lease_key,
5472     .new_lease_key = smb2_new_lease_key,
5473     .generate_signingkey = generate_smb30signingkey,
5474     .calc_signature = smb3_calc_signature,
5475     .set_integrity  = smb3_set_integrity,
5476     .is_read_op = smb21_is_read_op,
5477     .set_oplock_level = smb3_set_oplock_level,
5478     .create_lease_buf = smb3_create_lease_buf,
5479     .parse_lease_buf = smb3_parse_lease_buf,
5480     .copychunk_range = smb2_copychunk_range,
5481     .duplicate_extents = smb2_duplicate_extents,
5482     .validate_negotiate = smb3_validate_negotiate,
5483     .wp_retry_size = smb2_wp_retry_size,
5484     .dir_needs_close = smb2_dir_needs_close,
5485     .fallocate = smb3_fallocate,
5486     .enum_snapshots = smb3_enum_snapshots,
5487     .notify = smb3_notify,
5488     .init_transform_rq = smb3_init_transform_rq,
5489     .is_transform_hdr = smb3_is_transform_hdr,
5490     .receive_transform = smb3_receive_transform,
5491     .get_dfs_refer = smb2_get_dfs_refer,
5492     .select_sectype = smb2_select_sectype,
5493 #ifdef CONFIG_CIFS_XATTR
5494     .query_all_EAs = smb2_query_eas,
5495     .set_EA = smb2_set_ea,
5496 #endif /* CIFS_XATTR */
5497     .get_acl = get_smb2_acl,
5498     .get_acl_by_fid = get_smb2_acl_by_fid,
5499     .set_acl = set_smb2_acl,
5500     .next_header = smb2_next_header,
5501     .ioctl_query_info = smb2_ioctl_query_info,
5502     .make_node = smb2_make_node,
5503     .fiemap = smb3_fiemap,
5504     .llseek = smb3_llseek,
5505     .is_status_io_timeout = smb2_is_status_io_timeout,
5506     .is_network_name_deleted = smb2_is_network_name_deleted,
5507 };
5508
5509 struct smb_version_operations smb311_operations = {
5510     .compare_fids = smb2_compare_fids,
5511     .setup_request = smb2_setup_request,
5512     .setup_async_request = smb2_setup_async_request,
5513     .check_receive = smb2_check_receive,
5514     .add_credits = smb2_add_credits,
5515     .set_credits = smb2_set_credits,
5516     .get_credits_field = smb2_get_credits_field,
5517     .get_credits = smb2_get_credits,
5518     .wait_mtu_credits = smb2_wait_mtu_credits,
5519     .adjust_credits = smb2_adjust_credits,
5520     .get_next_mid = smb2_get_next_mid,
5521     .revert_current_mid = smb2_revert_current_mid,
5522     .read_data_offset = smb2_read_data_offset,
5523     .read_data_length = smb2_read_data_length,
5524     .map_error = map_smb2_to_linux_error,
5525     .find_mid = smb2_find_mid,
5526     .check_message = smb2_check_message,
5527     .dump_detail = smb2_dump_detail,
5528     .clear_stats = smb2_clear_stats,
5529     .print_stats = smb2_print_stats,
5530     .dump_share_caps = smb2_dump_share_caps,
5531     .is_oplock_break = smb2_is_valid_oplock_break,
5532     .handle_cancelled_mid = smb2_handle_cancelled_mid,
5533     .downgrade_oplock = smb3_downgrade_oplock,
5534     .need_neg = smb2_need_neg,
5535     .negotiate = smb2_negotiate,
5536     .negotiate_wsize = smb3_negotiate_wsize,
5537     .negotiate_rsize = smb3_negotiate_rsize,
5538     .sess_setup = SMB2_sess_setup,
5539     .logoff = SMB2_logoff,
5540     .tree_connect = SMB2_tcon,
5541     .tree_disconnect = SMB2_tdis,
5542     .qfs_tcon = smb3_qfs_tcon,
5543     .is_path_accessible = smb2_is_path_accessible,
5544     .can_echo = smb2_can_echo,
5545     .echo = SMB2_echo,
5546     .query_path_info = smb2_query_path_info,
5547     .query_reparse_tag = smb2_query_reparse_tag,
5548     .get_srv_inum = smb2_get_srv_inum,
5549     .query_file_info = smb2_query_file_info,
5550     .set_path_size = smb2_set_path_size,
5551     .set_file_size = smb2_set_file_size,
5552     .set_file_info = smb2_set_file_info,
5553     .set_compression = smb2_set_compression,
5554     .mkdir = smb2_mkdir,
5555     .mkdir_setinfo = smb2_mkdir_setinfo,
5556     .posix_mkdir = smb311_posix_mkdir,
5557     .rmdir = smb2_rmdir,
5558     .unlink = smb2_unlink,
5559     .rename = smb2_rename_path,
5560     .create_hardlink = smb2_create_hardlink,
5561     .query_symlink = smb2_query_symlink,
5562     .query_mf_symlink = smb3_query_mf_symlink,
5563     .create_mf_symlink = smb3_create_mf_symlink,
5564     .open = smb2_open_file,
5565     .set_fid = smb2_set_fid,
5566     .close = smb2_close_file,
5567     .close_getattr = smb2_close_getattr,
5568     .flush = smb2_flush_file,
5569     .async_readv = smb2_async_readv,
5570     .async_writev = smb2_async_writev,
5571     .sync_read = smb2_sync_read,
5572     .sync_write = smb2_sync_write,
5573     .query_dir_first = smb2_query_dir_first,
5574     .query_dir_next = smb2_query_dir_next,
5575     .close_dir = smb2_close_dir,
5576     .calc_smb_size = smb2_calc_size,
5577     .is_status_pending = smb2_is_status_pending,
5578     .is_session_expired = smb2_is_session_expired,
5579     .oplock_response = smb2_oplock_response,
5580     .queryfs = smb311_queryfs,
5581     .mand_lock = smb2_mand_lock,
5582     .mand_unlock_range = smb2_unlock_range,
5583     .push_mand_locks = smb2_push_mandatory_locks,
5584     .get_lease_key = smb2_get_lease_key,
5585     .set_lease_key = smb2_set_lease_key,
5586     .new_lease_key = smb2_new_lease_key,
5587     .generate_signingkey = generate_smb311signingkey,
5588     .calc_signature = smb3_calc_signature,
5589     .set_integrity  = smb3_set_integrity,
5590     .is_read_op = smb21_is_read_op,
5591     .set_oplock_level = smb3_set_oplock_level,
5592     .create_lease_buf = smb3_create_lease_buf,
5593     .parse_lease_buf = smb3_parse_lease_buf,
5594     .copychunk_range = smb2_copychunk_range,
5595     .duplicate_extents = smb2_duplicate_extents,
5596 /*  .validate_negotiate = smb3_validate_negotiate, */ /* not used in 3.11 */
5597     .wp_retry_size = smb2_wp_retry_size,
5598     .dir_needs_close = smb2_dir_needs_close,
5599     .fallocate = smb3_fallocate,
5600     .enum_snapshots = smb3_enum_snapshots,
5601     .notify = smb3_notify,
5602     .init_transform_rq = smb3_init_transform_rq,
5603     .is_transform_hdr = smb3_is_transform_hdr,
5604     .receive_transform = smb3_receive_transform,
5605     .get_dfs_refer = smb2_get_dfs_refer,
5606     .select_sectype = smb2_select_sectype,
5607 #ifdef CONFIG_CIFS_XATTR
5608     .query_all_EAs = smb2_query_eas,
5609     .set_EA = smb2_set_ea,
5610 #endif /* CIFS_XATTR */
5611     .get_acl = get_smb2_acl,
5612     .get_acl_by_fid = get_smb2_acl_by_fid,
5613     .set_acl = set_smb2_acl,
5614     .next_header = smb2_next_header,
5615     .ioctl_query_info = smb2_ioctl_query_info,
5616     .make_node = smb2_make_node,
5617     .fiemap = smb3_fiemap,
5618     .llseek = smb3_llseek,
5619     .is_status_io_timeout = smb2_is_status_io_timeout,
5620     .is_network_name_deleted = smb2_is_network_name_deleted,
5621 };
5622
5623 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
5624 struct smb_version_values smb20_values = {
5625     .version_string = SMB20_VERSION_STRING,
5626     .protocol_id = SMB20_PROT_ID,
5627     .req_capabilities = 0, /* MBZ */
5628     .large_lock_type = 0,
5629     .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE,
5630     .shared_lock_type = SMB2_LOCKFLAG_SHARED,
5631     .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
5632     .header_size = sizeof(struct smb2_hdr),
5633     .header_preamble_size = 0,
5634     .max_header_size = MAX_SMB2_HDR_SIZE,
5635     .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
5636     .lock_cmd = SMB2_LOCK,
5637     .cap_unix = 0,
5638     .cap_nt_find = SMB2_NT_FIND,
5639     .cap_large_files = SMB2_LARGE_FILES,
5640     .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
5641     .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
5642     .create_lease_size = sizeof(struct create_lease),
5643 };
5644 #endif /* ALLOW_INSECURE_LEGACY */
5645
5646 struct smb_version_values smb21_values = {
5647     .version_string = SMB21_VERSION_STRING,
5648     .protocol_id = SMB21_PROT_ID,
5649     .req_capabilities = 0, /* MBZ on negotiate req until SMB3 dialect */
5650     .large_lock_type = 0,
5651     .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE,
5652     .shared_lock_type = SMB2_LOCKFLAG_SHARED,
5653     .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
5654     .header_size = sizeof(struct smb2_hdr),
5655     .header_preamble_size = 0,
5656     .max_header_size = MAX_SMB2_HDR_SIZE,
5657     .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
5658     .lock_cmd = SMB2_LOCK,
5659     .cap_unix = 0,
5660     .cap_nt_find = SMB2_NT_FIND,
5661     .cap_large_files = SMB2_LARGE_FILES,
5662     .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
5663     .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
5664     .create_lease_size = sizeof(struct create_lease),
5665 };
5666
5667 struct smb_version_values smb3any_values = {
5668     .version_string = SMB3ANY_VERSION_STRING,
5669     .protocol_id = SMB302_PROT_ID, /* doesn't matter, send protocol array */
5670     .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION | SMB2_GLOBAL_CAP_DIRECTORY_LEASING,
5671     .large_lock_type = 0,
5672     .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE,
5673     .shared_lock_type = SMB2_LOCKFLAG_SHARED,
5674     .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
5675     .header_size = sizeof(struct smb2_hdr),
5676     .header_preamble_size = 0,
5677     .max_header_size = MAX_SMB2_HDR_SIZE,
5678     .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
5679     .lock_cmd = SMB2_LOCK,
5680     .cap_unix = 0,
5681     .cap_nt_find = SMB2_NT_FIND,
5682     .cap_large_files = SMB2_LARGE_FILES,
5683     .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
5684     .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
5685     .create_lease_size = sizeof(struct create_lease_v2),
5686 };
5687
5688 struct smb_version_values smbdefault_values = {
5689     .version_string = SMBDEFAULT_VERSION_STRING,
5690     .protocol_id = SMB302_PROT_ID, /* doesn't matter, send protocol array */
5691     .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION | SMB2_GLOBAL_CAP_DIRECTORY_LEASING,
5692     .large_lock_type = 0,
5693     .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE,
5694     .shared_lock_type = SMB2_LOCKFLAG_SHARED,
5695     .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
5696     .header_size = sizeof(struct smb2_hdr),
5697     .header_preamble_size = 0,
5698     .max_header_size = MAX_SMB2_HDR_SIZE,
5699     .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
5700     .lock_cmd = SMB2_LOCK,
5701     .cap_unix = 0,
5702     .cap_nt_find = SMB2_NT_FIND,
5703     .cap_large_files = SMB2_LARGE_FILES,
5704     .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
5705     .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
5706     .create_lease_size = sizeof(struct create_lease_v2),
5707 };
5708
5709 struct smb_version_values smb30_values = {
5710     .version_string = SMB30_VERSION_STRING,
5711     .protocol_id = SMB30_PROT_ID,
5712     .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION | SMB2_GLOBAL_CAP_DIRECTORY_LEASING,
5713     .large_lock_type = 0,
5714     .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE,
5715     .shared_lock_type = SMB2_LOCKFLAG_SHARED,
5716     .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
5717     .header_size = sizeof(struct smb2_hdr),
5718     .header_preamble_size = 0,
5719     .max_header_size = MAX_SMB2_HDR_SIZE,
5720     .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
5721     .lock_cmd = SMB2_LOCK,
5722     .cap_unix = 0,
5723     .cap_nt_find = SMB2_NT_FIND,
5724     .cap_large_files = SMB2_LARGE_FILES,
5725     .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
5726     .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
5727     .create_lease_size = sizeof(struct create_lease_v2),
5728 };
5729
5730 struct smb_version_values smb302_values = {
5731     .version_string = SMB302_VERSION_STRING,
5732     .protocol_id = SMB302_PROT_ID,
5733     .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION | SMB2_GLOBAL_CAP_DIRECTORY_LEASING,
5734     .large_lock_type = 0,
5735     .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE,
5736     .shared_lock_type = SMB2_LOCKFLAG_SHARED,
5737     .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
5738     .header_size = sizeof(struct smb2_hdr),
5739     .header_preamble_size = 0,
5740     .max_header_size = MAX_SMB2_HDR_SIZE,
5741     .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
5742     .lock_cmd = SMB2_LOCK,
5743     .cap_unix = 0,
5744     .cap_nt_find = SMB2_NT_FIND,
5745     .cap_large_files = SMB2_LARGE_FILES,
5746     .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
5747     .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
5748     .create_lease_size = sizeof(struct create_lease_v2),
5749 };
5750
5751 struct smb_version_values smb311_values = {
5752     .version_string = SMB311_VERSION_STRING,
5753     .protocol_id = SMB311_PROT_ID,
5754     .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION | SMB2_GLOBAL_CAP_DIRECTORY_LEASING,
5755     .large_lock_type = 0,
5756     .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE,
5757     .shared_lock_type = SMB2_LOCKFLAG_SHARED,
5758     .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
5759     .header_size = sizeof(struct smb2_hdr),
5760     .header_preamble_size = 0,
5761     .max_header_size = MAX_SMB2_HDR_SIZE,
5762     .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
5763     .lock_cmd = SMB2_LOCK,
5764     .cap_unix = 0,
5765     .cap_nt_find = SMB2_NT_FIND,
5766     .cap_large_files = SMB2_LARGE_FILES,
5767     .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
5768     .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
5769     .create_lease_size = sizeof(struct create_lease_v2),
5770 };