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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 
0003 #include <linux/ceph/ceph_debug.h>
0004 #include <linux/backing-dev.h>
0005 #include <linux/ctype.h>
0006 #include <linux/fs.h>
0007 #include <linux/inet.h>
0008 #include <linux/in6.h>
0009 #include <linux/key.h>
0010 #include <keys/ceph-type.h>
0011 #include <linux/module.h>
0012 #include <linux/mount.h>
0013 #include <linux/nsproxy.h>
0014 #include <linux/fs_parser.h>
0015 #include <linux/sched.h>
0016 #include <linux/sched/mm.h>
0017 #include <linux/seq_file.h>
0018 #include <linux/slab.h>
0019 #include <linux/statfs.h>
0020 #include <linux/string.h>
0021 #include <linux/vmalloc.h>
0022 
0023 
0024 #include <linux/ceph/ceph_features.h>
0025 #include <linux/ceph/libceph.h>
0026 #include <linux/ceph/debugfs.h>
0027 #include <linux/ceph/decode.h>
0028 #include <linux/ceph/mon_client.h>
0029 #include <linux/ceph/auth.h>
0030 #include "crypto.h"
0031 
0032 
0033 /*
0034  * Module compatibility interface.  For now it doesn't do anything,
0035  * but its existence signals a certain level of functionality.
0036  *
0037  * The data buffer is used to pass information both to and from
0038  * libceph.  The return value indicates whether libceph determines
0039  * it is compatible with the caller (from another kernel module),
0040  * given the provided data.
0041  *
0042  * The data pointer can be null.
0043  */
0044 bool libceph_compatible(void *data)
0045 {
0046     return true;
0047 }
0048 EXPORT_SYMBOL(libceph_compatible);
0049 
0050 static int param_get_supported_features(char *buffer,
0051                     const struct kernel_param *kp)
0052 {
0053     return sprintf(buffer, "0x%llx", CEPH_FEATURES_SUPPORTED_DEFAULT);
0054 }
0055 static const struct kernel_param_ops param_ops_supported_features = {
0056     .get = param_get_supported_features,
0057 };
0058 module_param_cb(supported_features, &param_ops_supported_features, NULL,
0059         0444);
0060 
0061 const char *ceph_msg_type_name(int type)
0062 {
0063     switch (type) {
0064     case CEPH_MSG_SHUTDOWN: return "shutdown";
0065     case CEPH_MSG_PING: return "ping";
0066     case CEPH_MSG_AUTH: return "auth";
0067     case CEPH_MSG_AUTH_REPLY: return "auth_reply";
0068     case CEPH_MSG_MON_MAP: return "mon_map";
0069     case CEPH_MSG_MON_GET_MAP: return "mon_get_map";
0070     case CEPH_MSG_MON_SUBSCRIBE: return "mon_subscribe";
0071     case CEPH_MSG_MON_SUBSCRIBE_ACK: return "mon_subscribe_ack";
0072     case CEPH_MSG_STATFS: return "statfs";
0073     case CEPH_MSG_STATFS_REPLY: return "statfs_reply";
0074     case CEPH_MSG_MON_GET_VERSION: return "mon_get_version";
0075     case CEPH_MSG_MON_GET_VERSION_REPLY: return "mon_get_version_reply";
0076     case CEPH_MSG_MDS_MAP: return "mds_map";
0077     case CEPH_MSG_FS_MAP_USER: return "fs_map_user";
0078     case CEPH_MSG_CLIENT_SESSION: return "client_session";
0079     case CEPH_MSG_CLIENT_RECONNECT: return "client_reconnect";
0080     case CEPH_MSG_CLIENT_REQUEST: return "client_request";
0081     case CEPH_MSG_CLIENT_REQUEST_FORWARD: return "client_request_forward";
0082     case CEPH_MSG_CLIENT_REPLY: return "client_reply";
0083     case CEPH_MSG_CLIENT_CAPS: return "client_caps";
0084     case CEPH_MSG_CLIENT_CAPRELEASE: return "client_cap_release";
0085     case CEPH_MSG_CLIENT_QUOTA: return "client_quota";
0086     case CEPH_MSG_CLIENT_SNAP: return "client_snap";
0087     case CEPH_MSG_CLIENT_LEASE: return "client_lease";
0088     case CEPH_MSG_POOLOP_REPLY: return "poolop_reply";
0089     case CEPH_MSG_POOLOP: return "poolop";
0090     case CEPH_MSG_MON_COMMAND: return "mon_command";
0091     case CEPH_MSG_MON_COMMAND_ACK: return "mon_command_ack";
0092     case CEPH_MSG_OSD_MAP: return "osd_map";
0093     case CEPH_MSG_OSD_OP: return "osd_op";
0094     case CEPH_MSG_OSD_OPREPLY: return "osd_opreply";
0095     case CEPH_MSG_WATCH_NOTIFY: return "watch_notify";
0096     case CEPH_MSG_OSD_BACKOFF: return "osd_backoff";
0097     default: return "unknown";
0098     }
0099 }
0100 EXPORT_SYMBOL(ceph_msg_type_name);
0101 
0102 /*
0103  * Initially learn our fsid, or verify an fsid matches.
0104  */
0105 int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid)
0106 {
0107     if (client->have_fsid) {
0108         if (ceph_fsid_compare(&client->fsid, fsid)) {
0109             pr_err("bad fsid, had %pU got %pU",
0110                    &client->fsid, fsid);
0111             return -1;
0112         }
0113     } else {
0114         memcpy(&client->fsid, fsid, sizeof(*fsid));
0115     }
0116     return 0;
0117 }
0118 EXPORT_SYMBOL(ceph_check_fsid);
0119 
0120 static int strcmp_null(const char *s1, const char *s2)
0121 {
0122     if (!s1 && !s2)
0123         return 0;
0124     if (s1 && !s2)
0125         return -1;
0126     if (!s1 && s2)
0127         return 1;
0128     return strcmp(s1, s2);
0129 }
0130 
0131 int ceph_compare_options(struct ceph_options *new_opt,
0132              struct ceph_client *client)
0133 {
0134     struct ceph_options *opt1 = new_opt;
0135     struct ceph_options *opt2 = client->options;
0136     int ofs = offsetof(struct ceph_options, mon_addr);
0137     int i;
0138     int ret;
0139 
0140     /*
0141      * Don't bother comparing options if network namespaces don't
0142      * match.
0143      */
0144     if (!net_eq(current->nsproxy->net_ns, read_pnet(&client->msgr.net)))
0145         return -1;
0146 
0147     ret = memcmp(opt1, opt2, ofs);
0148     if (ret)
0149         return ret;
0150 
0151     ret = strcmp_null(opt1->name, opt2->name);
0152     if (ret)
0153         return ret;
0154 
0155     if (opt1->key && !opt2->key)
0156         return -1;
0157     if (!opt1->key && opt2->key)
0158         return 1;
0159     if (opt1->key && opt2->key) {
0160         if (opt1->key->type != opt2->key->type)
0161             return -1;
0162         if (opt1->key->created.tv_sec != opt2->key->created.tv_sec)
0163             return -1;
0164         if (opt1->key->created.tv_nsec != opt2->key->created.tv_nsec)
0165             return -1;
0166         if (opt1->key->len != opt2->key->len)
0167             return -1;
0168         if (opt1->key->key && !opt2->key->key)
0169             return -1;
0170         if (!opt1->key->key && opt2->key->key)
0171             return 1;
0172         if (opt1->key->key && opt2->key->key) {
0173             ret = memcmp(opt1->key->key, opt2->key->key, opt1->key->len);
0174             if (ret)
0175                 return ret;
0176         }
0177     }
0178 
0179     ret = ceph_compare_crush_locs(&opt1->crush_locs, &opt2->crush_locs);
0180     if (ret)
0181         return ret;
0182 
0183     /* any matching mon ip implies a match */
0184     for (i = 0; i < opt1->num_mon; i++) {
0185         if (ceph_monmap_contains(client->monc.monmap,
0186                  &opt1->mon_addr[i]))
0187             return 0;
0188     }
0189     return -1;
0190 }
0191 EXPORT_SYMBOL(ceph_compare_options);
0192 
0193 int ceph_parse_fsid(const char *str, struct ceph_fsid *fsid)
0194 {
0195     int i = 0;
0196     char tmp[3];
0197     int err = -EINVAL;
0198     int d;
0199 
0200     dout("%s '%s'\n", __func__, str);
0201     tmp[2] = 0;
0202     while (*str && i < 16) {
0203         if (ispunct(*str)) {
0204             str++;
0205             continue;
0206         }
0207         if (!isxdigit(str[0]) || !isxdigit(str[1]))
0208             break;
0209         tmp[0] = str[0];
0210         tmp[1] = str[1];
0211         if (sscanf(tmp, "%x", &d) < 1)
0212             break;
0213         fsid->fsid[i] = d & 0xff;
0214         i++;
0215         str += 2;
0216     }
0217 
0218     if (i == 16)
0219         err = 0;
0220     dout("%s ret %d got fsid %pU\n", __func__, err, fsid);
0221     return err;
0222 }
0223 EXPORT_SYMBOL(ceph_parse_fsid);
0224 
0225 /*
0226  * ceph options
0227  */
0228 enum {
0229     Opt_osdkeepalivetimeout,
0230     Opt_mount_timeout,
0231     Opt_osd_idle_ttl,
0232     Opt_osd_request_timeout,
0233     /* int args above */
0234     Opt_fsid,
0235     Opt_name,
0236     Opt_secret,
0237     Opt_key,
0238     Opt_ip,
0239     Opt_crush_location,
0240     Opt_read_from_replica,
0241     Opt_ms_mode,
0242     /* string args above */
0243     Opt_share,
0244     Opt_crc,
0245     Opt_cephx_require_signatures,
0246     Opt_cephx_sign_messages,
0247     Opt_tcp_nodelay,
0248     Opt_abort_on_full,
0249     Opt_rxbounce,
0250 };
0251 
0252 enum {
0253     Opt_read_from_replica_no,
0254     Opt_read_from_replica_balance,
0255     Opt_read_from_replica_localize,
0256 };
0257 
0258 static const struct constant_table ceph_param_read_from_replica[] = {
0259     {"no",      Opt_read_from_replica_no},
0260     {"balance", Opt_read_from_replica_balance},
0261     {"localize",    Opt_read_from_replica_localize},
0262     {}
0263 };
0264 
0265 enum ceph_ms_mode {
0266     Opt_ms_mode_legacy,
0267     Opt_ms_mode_crc,
0268     Opt_ms_mode_secure,
0269     Opt_ms_mode_prefer_crc,
0270     Opt_ms_mode_prefer_secure
0271 };
0272 
0273 static const struct constant_table ceph_param_ms_mode[] = {
0274     {"legacy",      Opt_ms_mode_legacy},
0275     {"crc",         Opt_ms_mode_crc},
0276     {"secure",      Opt_ms_mode_secure},
0277     {"prefer-crc",      Opt_ms_mode_prefer_crc},
0278     {"prefer-secure",   Opt_ms_mode_prefer_secure},
0279     {}
0280 };
0281 
0282 static const struct fs_parameter_spec ceph_parameters[] = {
0283     fsparam_flag    ("abort_on_full",       Opt_abort_on_full),
0284     __fsparam   (NULL, "cephx_require_signatures", Opt_cephx_require_signatures,
0285              fs_param_neg_with_no|fs_param_deprecated, NULL),
0286     fsparam_flag_no ("cephx_sign_messages",     Opt_cephx_sign_messages),
0287     fsparam_flag_no ("crc",             Opt_crc),
0288     fsparam_string  ("crush_location",      Opt_crush_location),
0289     fsparam_string  ("fsid",            Opt_fsid),
0290     fsparam_string  ("ip",              Opt_ip),
0291     fsparam_string  ("key",             Opt_key),
0292     fsparam_u32 ("mount_timeout",       Opt_mount_timeout),
0293     fsparam_string  ("name",            Opt_name),
0294     fsparam_u32 ("osd_idle_ttl",        Opt_osd_idle_ttl),
0295     fsparam_u32 ("osd_request_timeout",     Opt_osd_request_timeout),
0296     fsparam_u32 ("osdkeepalive",        Opt_osdkeepalivetimeout),
0297     fsparam_enum    ("read_from_replica",       Opt_read_from_replica,
0298              ceph_param_read_from_replica),
0299     fsparam_flag    ("rxbounce",            Opt_rxbounce),
0300     fsparam_enum    ("ms_mode",         Opt_ms_mode,
0301              ceph_param_ms_mode),
0302     fsparam_string  ("secret",          Opt_secret),
0303     fsparam_flag_no ("share",           Opt_share),
0304     fsparam_flag_no ("tcp_nodelay",         Opt_tcp_nodelay),
0305     {}
0306 };
0307 
0308 struct ceph_options *ceph_alloc_options(void)
0309 {
0310     struct ceph_options *opt;
0311 
0312     opt = kzalloc(sizeof(*opt), GFP_KERNEL);
0313     if (!opt)
0314         return NULL;
0315 
0316     opt->crush_locs = RB_ROOT;
0317     opt->mon_addr = kcalloc(CEPH_MAX_MON, sizeof(*opt->mon_addr),
0318                 GFP_KERNEL);
0319     if (!opt->mon_addr) {
0320         kfree(opt);
0321         return NULL;
0322     }
0323 
0324     opt->flags = CEPH_OPT_DEFAULT;
0325     opt->osd_keepalive_timeout = CEPH_OSD_KEEPALIVE_DEFAULT;
0326     opt->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT;
0327     opt->osd_idle_ttl = CEPH_OSD_IDLE_TTL_DEFAULT;
0328     opt->osd_request_timeout = CEPH_OSD_REQUEST_TIMEOUT_DEFAULT;
0329     opt->read_from_replica = CEPH_READ_FROM_REPLICA_DEFAULT;
0330     opt->con_modes[0] = CEPH_CON_MODE_UNKNOWN;
0331     opt->con_modes[1] = CEPH_CON_MODE_UNKNOWN;
0332     return opt;
0333 }
0334 EXPORT_SYMBOL(ceph_alloc_options);
0335 
0336 void ceph_destroy_options(struct ceph_options *opt)
0337 {
0338     dout("destroy_options %p\n", opt);
0339     if (!opt)
0340         return;
0341 
0342     ceph_clear_crush_locs(&opt->crush_locs);
0343     kfree(opt->name);
0344     if (opt->key) {
0345         ceph_crypto_key_destroy(opt->key);
0346         kfree(opt->key);
0347     }
0348     kfree(opt->mon_addr);
0349     kfree(opt);
0350 }
0351 EXPORT_SYMBOL(ceph_destroy_options);
0352 
0353 /* get secret from key store */
0354 static int get_secret(struct ceph_crypto_key *dst, const char *name,
0355               struct p_log *log)
0356 {
0357     struct key *ukey;
0358     int key_err;
0359     int err = 0;
0360     struct ceph_crypto_key *ckey;
0361 
0362     ukey = request_key(&key_type_ceph, name, NULL);
0363     if (IS_ERR(ukey)) {
0364         /* request_key errors don't map nicely to mount(2)
0365            errors; don't even try, but still printk */
0366         key_err = PTR_ERR(ukey);
0367         switch (key_err) {
0368         case -ENOKEY:
0369             error_plog(log, "Failed due to key not found: %s",
0370                    name);
0371             break;
0372         case -EKEYEXPIRED:
0373             error_plog(log, "Failed due to expired key: %s",
0374                    name);
0375             break;
0376         case -EKEYREVOKED:
0377             error_plog(log, "Failed due to revoked key: %s",
0378                    name);
0379             break;
0380         default:
0381             error_plog(log, "Failed due to key error %d: %s",
0382                    key_err, name);
0383         }
0384         err = -EPERM;
0385         goto out;
0386     }
0387 
0388     ckey = ukey->payload.data[0];
0389     err = ceph_crypto_key_clone(dst, ckey);
0390     if (err)
0391         goto out_key;
0392     /* pass through, err is 0 */
0393 
0394 out_key:
0395     key_put(ukey);
0396 out:
0397     return err;
0398 }
0399 
0400 int ceph_parse_mon_ips(const char *buf, size_t len, struct ceph_options *opt,
0401                struct fc_log *l, char delim)
0402 {
0403     struct p_log log = {.prefix = "libceph", .log = l};
0404     int ret;
0405 
0406     /* ip1[:port1][<delim>ip2[:port2]...] */
0407     ret = ceph_parse_ips(buf, buf + len, opt->mon_addr, CEPH_MAX_MON,
0408                  &opt->num_mon, delim);
0409     if (ret) {
0410         error_plog(&log, "Failed to parse monitor IPs: %d", ret);
0411         return ret;
0412     }
0413 
0414     return 0;
0415 }
0416 EXPORT_SYMBOL(ceph_parse_mon_ips);
0417 
0418 int ceph_parse_param(struct fs_parameter *param, struct ceph_options *opt,
0419              struct fc_log *l)
0420 {
0421     struct fs_parse_result result;
0422     int token, err;
0423     struct p_log log = {.prefix = "libceph", .log = l};
0424 
0425     token = __fs_parse(&log, ceph_parameters, param, &result);
0426     dout("%s fs_parse '%s' token %d\n", __func__, param->key, token);
0427     if (token < 0)
0428         return token;
0429 
0430     switch (token) {
0431     case Opt_ip:
0432         err = ceph_parse_ips(param->string,
0433                      param->string + param->size,
0434                      &opt->my_addr, 1, NULL, ',');
0435         if (err) {
0436             error_plog(&log, "Failed to parse ip: %d", err);
0437             return err;
0438         }
0439         opt->flags |= CEPH_OPT_MYIP;
0440         break;
0441 
0442     case Opt_fsid:
0443         err = ceph_parse_fsid(param->string, &opt->fsid);
0444         if (err) {
0445             error_plog(&log, "Failed to parse fsid: %d", err);
0446             return err;
0447         }
0448         opt->flags |= CEPH_OPT_FSID;
0449         break;
0450     case Opt_name:
0451         kfree(opt->name);
0452         opt->name = param->string;
0453         param->string = NULL;
0454         break;
0455     case Opt_secret:
0456         ceph_crypto_key_destroy(opt->key);
0457         kfree(opt->key);
0458 
0459         opt->key = kzalloc(sizeof(*opt->key), GFP_KERNEL);
0460         if (!opt->key)
0461             return -ENOMEM;
0462         err = ceph_crypto_key_unarmor(opt->key, param->string);
0463         if (err) {
0464             error_plog(&log, "Failed to parse secret: %d", err);
0465             return err;
0466         }
0467         break;
0468     case Opt_key:
0469         ceph_crypto_key_destroy(opt->key);
0470         kfree(opt->key);
0471 
0472         opt->key = kzalloc(sizeof(*opt->key), GFP_KERNEL);
0473         if (!opt->key)
0474             return -ENOMEM;
0475         return get_secret(opt->key, param->string, &log);
0476     case Opt_crush_location:
0477         ceph_clear_crush_locs(&opt->crush_locs);
0478         err = ceph_parse_crush_location(param->string,
0479                         &opt->crush_locs);
0480         if (err) {
0481             error_plog(&log, "Failed to parse CRUSH location: %d",
0482                    err);
0483             return err;
0484         }
0485         break;
0486     case Opt_read_from_replica:
0487         switch (result.uint_32) {
0488         case Opt_read_from_replica_no:
0489             opt->read_from_replica = 0;
0490             break;
0491         case Opt_read_from_replica_balance:
0492             opt->read_from_replica = CEPH_OSD_FLAG_BALANCE_READS;
0493             break;
0494         case Opt_read_from_replica_localize:
0495             opt->read_from_replica = CEPH_OSD_FLAG_LOCALIZE_READS;
0496             break;
0497         default:
0498             BUG();
0499         }
0500         break;
0501     case Opt_ms_mode:
0502         switch (result.uint_32) {
0503         case Opt_ms_mode_legacy:
0504             opt->con_modes[0] = CEPH_CON_MODE_UNKNOWN;
0505             opt->con_modes[1] = CEPH_CON_MODE_UNKNOWN;
0506             break;
0507         case Opt_ms_mode_crc:
0508             opt->con_modes[0] = CEPH_CON_MODE_CRC;
0509             opt->con_modes[1] = CEPH_CON_MODE_UNKNOWN;
0510             break;
0511         case Opt_ms_mode_secure:
0512             opt->con_modes[0] = CEPH_CON_MODE_SECURE;
0513             opt->con_modes[1] = CEPH_CON_MODE_UNKNOWN;
0514             break;
0515         case Opt_ms_mode_prefer_crc:
0516             opt->con_modes[0] = CEPH_CON_MODE_CRC;
0517             opt->con_modes[1] = CEPH_CON_MODE_SECURE;
0518             break;
0519         case Opt_ms_mode_prefer_secure:
0520             opt->con_modes[0] = CEPH_CON_MODE_SECURE;
0521             opt->con_modes[1] = CEPH_CON_MODE_CRC;
0522             break;
0523         default:
0524             BUG();
0525         }
0526         break;
0527 
0528     case Opt_osdkeepalivetimeout:
0529         /* 0 isn't well defined right now, reject it */
0530         if (result.uint_32 < 1 || result.uint_32 > INT_MAX / 1000)
0531             goto out_of_range;
0532         opt->osd_keepalive_timeout =
0533             msecs_to_jiffies(result.uint_32 * 1000);
0534         break;
0535     case Opt_osd_idle_ttl:
0536         /* 0 isn't well defined right now, reject it */
0537         if (result.uint_32 < 1 || result.uint_32 > INT_MAX / 1000)
0538             goto out_of_range;
0539         opt->osd_idle_ttl = msecs_to_jiffies(result.uint_32 * 1000);
0540         break;
0541     case Opt_mount_timeout:
0542         /* 0 is "wait forever" (i.e. infinite timeout) */
0543         if (result.uint_32 > INT_MAX / 1000)
0544             goto out_of_range;
0545         opt->mount_timeout = msecs_to_jiffies(result.uint_32 * 1000);
0546         break;
0547     case Opt_osd_request_timeout:
0548         /* 0 is "wait forever" (i.e. infinite timeout) */
0549         if (result.uint_32 > INT_MAX / 1000)
0550             goto out_of_range;
0551         opt->osd_request_timeout =
0552             msecs_to_jiffies(result.uint_32 * 1000);
0553         break;
0554 
0555     case Opt_share:
0556         if (!result.negated)
0557             opt->flags &= ~CEPH_OPT_NOSHARE;
0558         else
0559             opt->flags |= CEPH_OPT_NOSHARE;
0560         break;
0561     case Opt_crc:
0562         if (!result.negated)
0563             opt->flags &= ~CEPH_OPT_NOCRC;
0564         else
0565             opt->flags |= CEPH_OPT_NOCRC;
0566         break;
0567     case Opt_cephx_require_signatures:
0568         if (!result.negated)
0569             warn_plog(&log, "Ignoring cephx_require_signatures");
0570         else
0571             warn_plog(&log, "Ignoring nocephx_require_signatures, use nocephx_sign_messages");
0572         break;
0573     case Opt_cephx_sign_messages:
0574         if (!result.negated)
0575             opt->flags &= ~CEPH_OPT_NOMSGSIGN;
0576         else
0577             opt->flags |= CEPH_OPT_NOMSGSIGN;
0578         break;
0579     case Opt_tcp_nodelay:
0580         if (!result.negated)
0581             opt->flags |= CEPH_OPT_TCP_NODELAY;
0582         else
0583             opt->flags &= ~CEPH_OPT_TCP_NODELAY;
0584         break;
0585 
0586     case Opt_abort_on_full:
0587         opt->flags |= CEPH_OPT_ABORT_ON_FULL;
0588         break;
0589     case Opt_rxbounce:
0590         opt->flags |= CEPH_OPT_RXBOUNCE;
0591         break;
0592 
0593     default:
0594         BUG();
0595     }
0596 
0597     return 0;
0598 
0599 out_of_range:
0600     return inval_plog(&log, "%s out of range", param->key);
0601 }
0602 EXPORT_SYMBOL(ceph_parse_param);
0603 
0604 int ceph_print_client_options(struct seq_file *m, struct ceph_client *client,
0605                   bool show_all)
0606 {
0607     struct ceph_options *opt = client->options;
0608     size_t pos = m->count;
0609     struct rb_node *n;
0610 
0611     if (opt->name) {
0612         seq_puts(m, "name=");
0613         seq_escape(m, opt->name, ", \t\n\\");
0614         seq_putc(m, ',');
0615     }
0616     if (opt->key)
0617         seq_puts(m, "secret=<hidden>,");
0618 
0619     if (!RB_EMPTY_ROOT(&opt->crush_locs)) {
0620         seq_puts(m, "crush_location=");
0621         for (n = rb_first(&opt->crush_locs); ; ) {
0622             struct crush_loc_node *loc =
0623                 rb_entry(n, struct crush_loc_node, cl_node);
0624 
0625             seq_printf(m, "%s:%s", loc->cl_loc.cl_type_name,
0626                    loc->cl_loc.cl_name);
0627             n = rb_next(n);
0628             if (!n)
0629                 break;
0630 
0631             seq_putc(m, '|');
0632         }
0633         seq_putc(m, ',');
0634     }
0635     if (opt->read_from_replica == CEPH_OSD_FLAG_BALANCE_READS) {
0636         seq_puts(m, "read_from_replica=balance,");
0637     } else if (opt->read_from_replica == CEPH_OSD_FLAG_LOCALIZE_READS) {
0638         seq_puts(m, "read_from_replica=localize,");
0639     }
0640     if (opt->con_modes[0] != CEPH_CON_MODE_UNKNOWN) {
0641         if (opt->con_modes[0] == CEPH_CON_MODE_CRC &&
0642             opt->con_modes[1] == CEPH_CON_MODE_UNKNOWN) {
0643             seq_puts(m, "ms_mode=crc,");
0644         } else if (opt->con_modes[0] == CEPH_CON_MODE_SECURE &&
0645                opt->con_modes[1] == CEPH_CON_MODE_UNKNOWN) {
0646             seq_puts(m, "ms_mode=secure,");
0647         } else if (opt->con_modes[0] == CEPH_CON_MODE_CRC &&
0648                opt->con_modes[1] == CEPH_CON_MODE_SECURE) {
0649             seq_puts(m, "ms_mode=prefer-crc,");
0650         } else if (opt->con_modes[0] == CEPH_CON_MODE_SECURE &&
0651                opt->con_modes[1] == CEPH_CON_MODE_CRC) {
0652             seq_puts(m, "ms_mode=prefer-secure,");
0653         }
0654     }
0655 
0656     if (opt->flags & CEPH_OPT_FSID)
0657         seq_printf(m, "fsid=%pU,", &opt->fsid);
0658     if (opt->flags & CEPH_OPT_NOSHARE)
0659         seq_puts(m, "noshare,");
0660     if (opt->flags & CEPH_OPT_NOCRC)
0661         seq_puts(m, "nocrc,");
0662     if (opt->flags & CEPH_OPT_NOMSGSIGN)
0663         seq_puts(m, "nocephx_sign_messages,");
0664     if ((opt->flags & CEPH_OPT_TCP_NODELAY) == 0)
0665         seq_puts(m, "notcp_nodelay,");
0666     if (show_all && (opt->flags & CEPH_OPT_ABORT_ON_FULL))
0667         seq_puts(m, "abort_on_full,");
0668     if (opt->flags & CEPH_OPT_RXBOUNCE)
0669         seq_puts(m, "rxbounce,");
0670 
0671     if (opt->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT)
0672         seq_printf(m, "mount_timeout=%d,",
0673                jiffies_to_msecs(opt->mount_timeout) / 1000);
0674     if (opt->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT)
0675         seq_printf(m, "osd_idle_ttl=%d,",
0676                jiffies_to_msecs(opt->osd_idle_ttl) / 1000);
0677     if (opt->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT)
0678         seq_printf(m, "osdkeepalivetimeout=%d,",
0679             jiffies_to_msecs(opt->osd_keepalive_timeout) / 1000);
0680     if (opt->osd_request_timeout != CEPH_OSD_REQUEST_TIMEOUT_DEFAULT)
0681         seq_printf(m, "osd_request_timeout=%d,",
0682                jiffies_to_msecs(opt->osd_request_timeout) / 1000);
0683 
0684     /* drop redundant comma */
0685     if (m->count != pos)
0686         m->count--;
0687 
0688     return 0;
0689 }
0690 EXPORT_SYMBOL(ceph_print_client_options);
0691 
0692 struct ceph_entity_addr *ceph_client_addr(struct ceph_client *client)
0693 {
0694     return &client->msgr.inst.addr;
0695 }
0696 EXPORT_SYMBOL(ceph_client_addr);
0697 
0698 u64 ceph_client_gid(struct ceph_client *client)
0699 {
0700     return client->monc.auth->global_id;
0701 }
0702 EXPORT_SYMBOL(ceph_client_gid);
0703 
0704 /*
0705  * create a fresh client instance
0706  */
0707 struct ceph_client *ceph_create_client(struct ceph_options *opt, void *private)
0708 {
0709     struct ceph_client *client;
0710     struct ceph_entity_addr *myaddr = NULL;
0711     int err;
0712 
0713     err = wait_for_random_bytes();
0714     if (err < 0)
0715         return ERR_PTR(err);
0716 
0717     client = kzalloc(sizeof(*client), GFP_KERNEL);
0718     if (client == NULL)
0719         return ERR_PTR(-ENOMEM);
0720 
0721     client->private = private;
0722     client->options = opt;
0723 
0724     mutex_init(&client->mount_mutex);
0725     init_waitqueue_head(&client->auth_wq);
0726     client->auth_err = 0;
0727 
0728     client->extra_mon_dispatch = NULL;
0729     client->supported_features = CEPH_FEATURES_SUPPORTED_DEFAULT;
0730     client->required_features = CEPH_FEATURES_REQUIRED_DEFAULT;
0731 
0732     if (!ceph_test_opt(client, NOMSGSIGN))
0733         client->required_features |= CEPH_FEATURE_MSG_AUTH;
0734 
0735     /* msgr */
0736     if (ceph_test_opt(client, MYIP))
0737         myaddr = &client->options->my_addr;
0738 
0739     ceph_messenger_init(&client->msgr, myaddr);
0740 
0741     /* subsystems */
0742     err = ceph_monc_init(&client->monc, client);
0743     if (err < 0)
0744         goto fail;
0745     err = ceph_osdc_init(&client->osdc, client);
0746     if (err < 0)
0747         goto fail_monc;
0748 
0749     return client;
0750 
0751 fail_monc:
0752     ceph_monc_stop(&client->monc);
0753 fail:
0754     ceph_messenger_fini(&client->msgr);
0755     kfree(client);
0756     return ERR_PTR(err);
0757 }
0758 EXPORT_SYMBOL(ceph_create_client);
0759 
0760 void ceph_destroy_client(struct ceph_client *client)
0761 {
0762     dout("destroy_client %p\n", client);
0763 
0764     atomic_set(&client->msgr.stopping, 1);
0765 
0766     /* unmount */
0767     ceph_osdc_stop(&client->osdc);
0768     ceph_monc_stop(&client->monc);
0769     ceph_messenger_fini(&client->msgr);
0770 
0771     ceph_debugfs_client_cleanup(client);
0772 
0773     ceph_destroy_options(client->options);
0774 
0775     kfree(client);
0776     dout("destroy_client %p done\n", client);
0777 }
0778 EXPORT_SYMBOL(ceph_destroy_client);
0779 
0780 void ceph_reset_client_addr(struct ceph_client *client)
0781 {
0782     ceph_messenger_reset_nonce(&client->msgr);
0783     ceph_monc_reopen_session(&client->monc);
0784     ceph_osdc_reopen_osds(&client->osdc);
0785 }
0786 EXPORT_SYMBOL(ceph_reset_client_addr);
0787 
0788 /*
0789  * true if we have the mon map (and have thus joined the cluster)
0790  */
0791 static bool have_mon_and_osd_map(struct ceph_client *client)
0792 {
0793     return client->monc.monmap && client->monc.monmap->epoch &&
0794            client->osdc.osdmap && client->osdc.osdmap->epoch;
0795 }
0796 
0797 /*
0798  * mount: join the ceph cluster, and open root directory.
0799  */
0800 int __ceph_open_session(struct ceph_client *client, unsigned long started)
0801 {
0802     unsigned long timeout = client->options->mount_timeout;
0803     long err;
0804 
0805     /* open session, and wait for mon and osd maps */
0806     err = ceph_monc_open_session(&client->monc);
0807     if (err < 0)
0808         return err;
0809 
0810     while (!have_mon_and_osd_map(client)) {
0811         if (timeout && time_after_eq(jiffies, started + timeout))
0812             return -ETIMEDOUT;
0813 
0814         /* wait */
0815         dout("mount waiting for mon_map\n");
0816         err = wait_event_interruptible_timeout(client->auth_wq,
0817             have_mon_and_osd_map(client) || (client->auth_err < 0),
0818             ceph_timeout_jiffies(timeout));
0819         if (err < 0)
0820             return err;
0821         if (client->auth_err < 0)
0822             return client->auth_err;
0823     }
0824 
0825     pr_info("client%llu fsid %pU\n", ceph_client_gid(client),
0826         &client->fsid);
0827     ceph_debugfs_client_init(client);
0828 
0829     return 0;
0830 }
0831 EXPORT_SYMBOL(__ceph_open_session);
0832 
0833 int ceph_open_session(struct ceph_client *client)
0834 {
0835     int ret;
0836     unsigned long started = jiffies;  /* note the start time */
0837 
0838     dout("open_session start\n");
0839     mutex_lock(&client->mount_mutex);
0840 
0841     ret = __ceph_open_session(client, started);
0842 
0843     mutex_unlock(&client->mount_mutex);
0844     return ret;
0845 }
0846 EXPORT_SYMBOL(ceph_open_session);
0847 
0848 int ceph_wait_for_latest_osdmap(struct ceph_client *client,
0849                 unsigned long timeout)
0850 {
0851     u64 newest_epoch;
0852     int ret;
0853 
0854     ret = ceph_monc_get_version(&client->monc, "osdmap", &newest_epoch);
0855     if (ret)
0856         return ret;
0857 
0858     if (client->osdc.osdmap->epoch >= newest_epoch)
0859         return 0;
0860 
0861     ceph_osdc_maybe_request_map(&client->osdc);
0862     return ceph_monc_wait_osdmap(&client->monc, newest_epoch, timeout);
0863 }
0864 EXPORT_SYMBOL(ceph_wait_for_latest_osdmap);
0865 
0866 static int __init init_ceph_lib(void)
0867 {
0868     int ret = 0;
0869 
0870     ceph_debugfs_init();
0871 
0872     ret = ceph_crypto_init();
0873     if (ret < 0)
0874         goto out_debugfs;
0875 
0876     ret = ceph_msgr_init();
0877     if (ret < 0)
0878         goto out_crypto;
0879 
0880     ret = ceph_osdc_setup();
0881     if (ret < 0)
0882         goto out_msgr;
0883 
0884     pr_info("loaded (mon/osd proto %d/%d)\n",
0885         CEPH_MONC_PROTOCOL, CEPH_OSDC_PROTOCOL);
0886 
0887     return 0;
0888 
0889 out_msgr:
0890     ceph_msgr_exit();
0891 out_crypto:
0892     ceph_crypto_shutdown();
0893 out_debugfs:
0894     ceph_debugfs_cleanup();
0895     return ret;
0896 }
0897 
0898 static void __exit exit_ceph_lib(void)
0899 {
0900     dout("exit_ceph_lib\n");
0901     WARN_ON(!ceph_strings_empty());
0902 
0903     ceph_osdc_cleanup();
0904     ceph_msgr_exit();
0905     ceph_crypto_shutdown();
0906     ceph_debugfs_cleanup();
0907 }
0908 
0909 module_init(init_ceph_lib);
0910 module_exit(exit_ceph_lib);
0911 
0912 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
0913 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
0914 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
0915 MODULE_DESCRIPTION("Ceph core library");
0916 MODULE_LICENSE("GPL");
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