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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /******************************************************************************
0003 *******************************************************************************
0004 **
0005 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
0006 **  Copyright (C) 2005-2008 Red Hat, Inc.  All rights reserved.
0007 **
0008 **
0009 *******************************************************************************
0010 ******************************************************************************/
0011 
0012 #include "dlm_internal.h"
0013 #include "lockspace.h"
0014 #include "member.h"
0015 #include "lowcomms.h"
0016 #include "midcomms.h"
0017 #include "rcom.h"
0018 #include "recover.h"
0019 #include "dir.h"
0020 #include "config.h"
0021 #include "memory.h"
0022 #include "lock.h"
0023 #include "util.h"
0024 
0025 static int rcom_response(struct dlm_ls *ls)
0026 {
0027     return test_bit(LSFL_RCOM_READY, &ls->ls_flags);
0028 }
0029 
0030 static void _create_rcom(struct dlm_ls *ls, int to_nodeid, int type, int len,
0031              struct dlm_rcom **rc_ret, char *mb, int mb_len)
0032 {
0033     struct dlm_rcom *rc;
0034 
0035     rc = (struct dlm_rcom *) mb;
0036 
0037     rc->rc_header.h_version = cpu_to_le32(DLM_HEADER_MAJOR | DLM_HEADER_MINOR);
0038     rc->rc_header.u.h_lockspace = cpu_to_le32(ls->ls_global_id);
0039     rc->rc_header.h_nodeid = cpu_to_le32(dlm_our_nodeid());
0040     rc->rc_header.h_length = cpu_to_le16(mb_len);
0041     rc->rc_header.h_cmd = DLM_RCOM;
0042 
0043     rc->rc_type = cpu_to_le32(type);
0044 
0045     spin_lock(&ls->ls_recover_lock);
0046     rc->rc_seq = cpu_to_le64(ls->ls_recover_seq);
0047     spin_unlock(&ls->ls_recover_lock);
0048 
0049     *rc_ret = rc;
0050 }
0051 
0052 static int create_rcom(struct dlm_ls *ls, int to_nodeid, int type, int len,
0053                struct dlm_rcom **rc_ret, struct dlm_mhandle **mh_ret)
0054 {
0055     int mb_len = sizeof(struct dlm_rcom) + len;
0056     struct dlm_mhandle *mh;
0057     char *mb;
0058 
0059     mh = dlm_midcomms_get_mhandle(to_nodeid, mb_len, GFP_NOFS, &mb);
0060     if (!mh) {
0061         log_print("%s to %d type %d len %d ENOBUFS",
0062               __func__, to_nodeid, type, len);
0063         return -ENOBUFS;
0064     }
0065 
0066     _create_rcom(ls, to_nodeid, type, len, rc_ret, mb, mb_len);
0067     *mh_ret = mh;
0068     return 0;
0069 }
0070 
0071 static int create_rcom_stateless(struct dlm_ls *ls, int to_nodeid, int type,
0072                  int len, struct dlm_rcom **rc_ret,
0073                  struct dlm_msg **msg_ret)
0074 {
0075     int mb_len = sizeof(struct dlm_rcom) + len;
0076     struct dlm_msg *msg;
0077     char *mb;
0078 
0079     msg = dlm_lowcomms_new_msg(to_nodeid, mb_len, GFP_NOFS, &mb,
0080                    NULL, NULL);
0081     if (!msg) {
0082         log_print("create_rcom to %d type %d len %d ENOBUFS",
0083               to_nodeid, type, len);
0084         return -ENOBUFS;
0085     }
0086 
0087     _create_rcom(ls, to_nodeid, type, len, rc_ret, mb, mb_len);
0088     *msg_ret = msg;
0089     return 0;
0090 }
0091 
0092 static void send_rcom(struct dlm_mhandle *mh, struct dlm_rcom *rc)
0093 {
0094     dlm_midcomms_commit_mhandle(mh);
0095 }
0096 
0097 static void send_rcom_stateless(struct dlm_msg *msg, struct dlm_rcom *rc)
0098 {
0099     dlm_lowcomms_commit_msg(msg);
0100     dlm_lowcomms_put_msg(msg);
0101 }
0102 
0103 static void set_rcom_status(struct dlm_ls *ls, struct rcom_status *rs,
0104                 uint32_t flags)
0105 {
0106     rs->rs_flags = cpu_to_le32(flags);
0107 }
0108 
0109 /* When replying to a status request, a node also sends back its
0110    configuration values.  The requesting node then checks that the remote
0111    node is configured the same way as itself. */
0112 
0113 static void set_rcom_config(struct dlm_ls *ls, struct rcom_config *rf,
0114                 uint32_t num_slots)
0115 {
0116     rf->rf_lvblen = cpu_to_le32(ls->ls_lvblen);
0117     rf->rf_lsflags = cpu_to_le32(ls->ls_exflags);
0118 
0119     rf->rf_our_slot = cpu_to_le16(ls->ls_slot);
0120     rf->rf_num_slots = cpu_to_le16(num_slots);
0121     rf->rf_generation =  cpu_to_le32(ls->ls_generation);
0122 }
0123 
0124 static int check_rcom_config(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid)
0125 {
0126     struct rcom_config *rf = (struct rcom_config *) rc->rc_buf;
0127 
0128     if ((le32_to_cpu(rc->rc_header.h_version) & 0xFFFF0000) != DLM_HEADER_MAJOR) {
0129         log_error(ls, "version mismatch: %x nodeid %d: %x",
0130               DLM_HEADER_MAJOR | DLM_HEADER_MINOR, nodeid,
0131               le32_to_cpu(rc->rc_header.h_version));
0132         return -EPROTO;
0133     }
0134 
0135     if (le32_to_cpu(rf->rf_lvblen) != ls->ls_lvblen ||
0136         le32_to_cpu(rf->rf_lsflags) != ls->ls_exflags) {
0137         log_error(ls, "config mismatch: %d,%x nodeid %d: %d,%x",
0138               ls->ls_lvblen, ls->ls_exflags, nodeid,
0139               le32_to_cpu(rf->rf_lvblen),
0140               le32_to_cpu(rf->rf_lsflags));
0141         return -EPROTO;
0142     }
0143     return 0;
0144 }
0145 
0146 static void allow_sync_reply(struct dlm_ls *ls, __le64 *new_seq)
0147 {
0148     spin_lock(&ls->ls_rcom_spin);
0149     *new_seq = cpu_to_le64(++ls->ls_rcom_seq);
0150     set_bit(LSFL_RCOM_WAIT, &ls->ls_flags);
0151     spin_unlock(&ls->ls_rcom_spin);
0152 }
0153 
0154 static void disallow_sync_reply(struct dlm_ls *ls)
0155 {
0156     spin_lock(&ls->ls_rcom_spin);
0157     clear_bit(LSFL_RCOM_WAIT, &ls->ls_flags);
0158     clear_bit(LSFL_RCOM_READY, &ls->ls_flags);
0159     spin_unlock(&ls->ls_rcom_spin);
0160 }
0161 
0162 /*
0163  * low nodeid gathers one slot value at a time from each node.
0164  * it sets need_slots=0, and saves rf_our_slot returned from each
0165  * rcom_config.
0166  *
0167  * other nodes gather all slot values at once from the low nodeid.
0168  * they set need_slots=1, and ignore the rf_our_slot returned from each
0169  * rcom_config.  they use the rf_num_slots returned from the low
0170  * node's rcom_config.
0171  */
0172 
0173 int dlm_rcom_status(struct dlm_ls *ls, int nodeid, uint32_t status_flags)
0174 {
0175     struct dlm_rcom *rc;
0176     struct dlm_msg *msg;
0177     int error = 0;
0178 
0179     ls->ls_recover_nodeid = nodeid;
0180 
0181     if (nodeid == dlm_our_nodeid()) {
0182         rc = ls->ls_recover_buf;
0183         rc->rc_result = cpu_to_le32(dlm_recover_status(ls));
0184         goto out;
0185     }
0186 
0187 retry:
0188     error = create_rcom_stateless(ls, nodeid, DLM_RCOM_STATUS,
0189                       sizeof(struct rcom_status), &rc, &msg);
0190     if (error)
0191         goto out;
0192 
0193     set_rcom_status(ls, (struct rcom_status *)rc->rc_buf, status_flags);
0194 
0195     allow_sync_reply(ls, &rc->rc_id);
0196     memset(ls->ls_recover_buf, 0, DLM_MAX_SOCKET_BUFSIZE);
0197 
0198     send_rcom_stateless(msg, rc);
0199 
0200     error = dlm_wait_function(ls, &rcom_response);
0201     disallow_sync_reply(ls);
0202     if (error == -ETIMEDOUT)
0203         goto retry;
0204     if (error)
0205         goto out;
0206 
0207     rc = ls->ls_recover_buf;
0208 
0209     if (rc->rc_result == cpu_to_le32(-ESRCH)) {
0210         /* we pretend the remote lockspace exists with 0 status */
0211         log_debug(ls, "remote node %d not ready", nodeid);
0212         rc->rc_result = 0;
0213         error = 0;
0214     } else {
0215         error = check_rcom_config(ls, rc, nodeid);
0216     }
0217 
0218     /* the caller looks at rc_result for the remote recovery status */
0219  out:
0220     return error;
0221 }
0222 
0223 static void receive_rcom_status(struct dlm_ls *ls, struct dlm_rcom *rc_in)
0224 {
0225     struct dlm_rcom *rc;
0226     struct rcom_status *rs;
0227     uint32_t status;
0228     int nodeid = le32_to_cpu(rc_in->rc_header.h_nodeid);
0229     int len = sizeof(struct rcom_config);
0230     struct dlm_msg *msg;
0231     int num_slots = 0;
0232     int error;
0233 
0234     if (!dlm_slots_version(&rc_in->rc_header)) {
0235         status = dlm_recover_status(ls);
0236         goto do_create;
0237     }
0238 
0239     rs = (struct rcom_status *)rc_in->rc_buf;
0240 
0241     if (!(le32_to_cpu(rs->rs_flags) & DLM_RSF_NEED_SLOTS)) {
0242         status = dlm_recover_status(ls);
0243         goto do_create;
0244     }
0245 
0246     spin_lock(&ls->ls_recover_lock);
0247     status = ls->ls_recover_status;
0248     num_slots = ls->ls_num_slots;
0249     spin_unlock(&ls->ls_recover_lock);
0250     len += num_slots * sizeof(struct rcom_slot);
0251 
0252  do_create:
0253     error = create_rcom_stateless(ls, nodeid, DLM_RCOM_STATUS_REPLY,
0254                       len, &rc, &msg);
0255     if (error)
0256         return;
0257 
0258     rc->rc_id = rc_in->rc_id;
0259     rc->rc_seq_reply = rc_in->rc_seq;
0260     rc->rc_result = cpu_to_le32(status);
0261 
0262     set_rcom_config(ls, (struct rcom_config *)rc->rc_buf, num_slots);
0263 
0264     if (!num_slots)
0265         goto do_send;
0266 
0267     spin_lock(&ls->ls_recover_lock);
0268     if (ls->ls_num_slots != num_slots) {
0269         spin_unlock(&ls->ls_recover_lock);
0270         log_debug(ls, "receive_rcom_status num_slots %d to %d",
0271               num_slots, ls->ls_num_slots);
0272         rc->rc_result = 0;
0273         set_rcom_config(ls, (struct rcom_config *)rc->rc_buf, 0);
0274         goto do_send;
0275     }
0276 
0277     dlm_slots_copy_out(ls, rc);
0278     spin_unlock(&ls->ls_recover_lock);
0279 
0280  do_send:
0281     send_rcom_stateless(msg, rc);
0282 }
0283 
0284 static void receive_sync_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in)
0285 {
0286     spin_lock(&ls->ls_rcom_spin);
0287     if (!test_bit(LSFL_RCOM_WAIT, &ls->ls_flags) ||
0288         le64_to_cpu(rc_in->rc_id) != ls->ls_rcom_seq) {
0289         log_debug(ls, "reject reply %d from %d seq %llx expect %llx",
0290               le32_to_cpu(rc_in->rc_type),
0291               le32_to_cpu(rc_in->rc_header.h_nodeid),
0292               (unsigned long long)le64_to_cpu(rc_in->rc_id),
0293               (unsigned long long)ls->ls_rcom_seq);
0294         goto out;
0295     }
0296     memcpy(ls->ls_recover_buf, rc_in,
0297            le16_to_cpu(rc_in->rc_header.h_length));
0298     set_bit(LSFL_RCOM_READY, &ls->ls_flags);
0299     clear_bit(LSFL_RCOM_WAIT, &ls->ls_flags);
0300     wake_up(&ls->ls_wait_general);
0301  out:
0302     spin_unlock(&ls->ls_rcom_spin);
0303 }
0304 
0305 int dlm_rcom_names(struct dlm_ls *ls, int nodeid, char *last_name, int last_len)
0306 {
0307     struct dlm_rcom *rc;
0308     struct dlm_msg *msg;
0309     int error = 0;
0310 
0311     ls->ls_recover_nodeid = nodeid;
0312 
0313 retry:
0314     error = create_rcom_stateless(ls, nodeid, DLM_RCOM_NAMES, last_len,
0315                       &rc, &msg);
0316     if (error)
0317         goto out;
0318     memcpy(rc->rc_buf, last_name, last_len);
0319 
0320     allow_sync_reply(ls, &rc->rc_id);
0321     memset(ls->ls_recover_buf, 0, DLM_MAX_SOCKET_BUFSIZE);
0322 
0323     send_rcom_stateless(msg, rc);
0324 
0325     error = dlm_wait_function(ls, &rcom_response);
0326     disallow_sync_reply(ls);
0327     if (error == -ETIMEDOUT)
0328         goto retry;
0329  out:
0330     return error;
0331 }
0332 
0333 static void receive_rcom_names(struct dlm_ls *ls, struct dlm_rcom *rc_in)
0334 {
0335     struct dlm_rcom *rc;
0336     int error, inlen, outlen, nodeid;
0337     struct dlm_msg *msg;
0338 
0339     nodeid = le32_to_cpu(rc_in->rc_header.h_nodeid);
0340     inlen = le16_to_cpu(rc_in->rc_header.h_length) -
0341         sizeof(struct dlm_rcom);
0342     outlen = DLM_MAX_APP_BUFSIZE - sizeof(struct dlm_rcom);
0343 
0344     error = create_rcom_stateless(ls, nodeid, DLM_RCOM_NAMES_REPLY, outlen,
0345                       &rc, &msg);
0346     if (error)
0347         return;
0348     rc->rc_id = rc_in->rc_id;
0349     rc->rc_seq_reply = rc_in->rc_seq;
0350 
0351     dlm_copy_master_names(ls, rc_in->rc_buf, inlen, rc->rc_buf, outlen,
0352                   nodeid);
0353     send_rcom_stateless(msg, rc);
0354 }
0355 
0356 int dlm_send_rcom_lookup(struct dlm_rsb *r, int dir_nodeid)
0357 {
0358     struct dlm_rcom *rc;
0359     struct dlm_mhandle *mh;
0360     struct dlm_ls *ls = r->res_ls;
0361     int error;
0362 
0363     error = create_rcom(ls, dir_nodeid, DLM_RCOM_LOOKUP, r->res_length,
0364                 &rc, &mh);
0365     if (error)
0366         goto out;
0367     memcpy(rc->rc_buf, r->res_name, r->res_length);
0368     rc->rc_id = cpu_to_le64(r->res_id);
0369 
0370     send_rcom(mh, rc);
0371  out:
0372     return error;
0373 }
0374 
0375 static void receive_rcom_lookup(struct dlm_ls *ls, struct dlm_rcom *rc_in)
0376 {
0377     struct dlm_rcom *rc;
0378     struct dlm_mhandle *mh;
0379     int error, ret_nodeid, nodeid = le32_to_cpu(rc_in->rc_header.h_nodeid);
0380     int len = le16_to_cpu(rc_in->rc_header.h_length) -
0381         sizeof(struct dlm_rcom);
0382 
0383     /* Old code would send this special id to trigger a debug dump. */
0384     if (rc_in->rc_id == cpu_to_le64(0xFFFFFFFF)) {
0385         log_error(ls, "receive_rcom_lookup dump from %d", nodeid);
0386         dlm_dump_rsb_name(ls, rc_in->rc_buf, len);
0387         return;
0388     }
0389 
0390     error = create_rcom(ls, nodeid, DLM_RCOM_LOOKUP_REPLY, 0, &rc, &mh);
0391     if (error)
0392         return;
0393 
0394     error = dlm_master_lookup(ls, nodeid, rc_in->rc_buf, len,
0395                   DLM_LU_RECOVER_MASTER, &ret_nodeid, NULL);
0396     if (error)
0397         ret_nodeid = error;
0398     rc->rc_result = cpu_to_le32(ret_nodeid);
0399     rc->rc_id = rc_in->rc_id;
0400     rc->rc_seq_reply = rc_in->rc_seq;
0401 
0402     send_rcom(mh, rc);
0403 }
0404 
0405 static void receive_rcom_lookup_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in)
0406 {
0407     dlm_recover_master_reply(ls, rc_in);
0408 }
0409 
0410 static void pack_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb,
0411                struct rcom_lock *rl)
0412 {
0413     memset(rl, 0, sizeof(*rl));
0414 
0415     rl->rl_ownpid = cpu_to_le32(lkb->lkb_ownpid);
0416     rl->rl_lkid = cpu_to_le32(lkb->lkb_id);
0417     rl->rl_exflags = cpu_to_le32(lkb->lkb_exflags);
0418     rl->rl_flags = cpu_to_le32(lkb->lkb_flags);
0419     rl->rl_lvbseq = cpu_to_le32(lkb->lkb_lvbseq);
0420     rl->rl_rqmode = lkb->lkb_rqmode;
0421     rl->rl_grmode = lkb->lkb_grmode;
0422     rl->rl_status = lkb->lkb_status;
0423     rl->rl_wait_type = cpu_to_le16(lkb->lkb_wait_type);
0424 
0425     if (lkb->lkb_bastfn)
0426         rl->rl_asts |= DLM_CB_BAST;
0427     if (lkb->lkb_astfn)
0428         rl->rl_asts |= DLM_CB_CAST;
0429 
0430     rl->rl_namelen = cpu_to_le16(r->res_length);
0431     memcpy(rl->rl_name, r->res_name, r->res_length);
0432 
0433     /* FIXME: might we have an lvb without DLM_LKF_VALBLK set ?
0434        If so, receive_rcom_lock_args() won't take this copy. */
0435 
0436     if (lkb->lkb_lvbptr)
0437         memcpy(rl->rl_lvb, lkb->lkb_lvbptr, r->res_ls->ls_lvblen);
0438 }
0439 
0440 int dlm_send_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
0441 {
0442     struct dlm_ls *ls = r->res_ls;
0443     struct dlm_rcom *rc;
0444     struct dlm_mhandle *mh;
0445     struct rcom_lock *rl;
0446     int error, len = sizeof(struct rcom_lock);
0447 
0448     if (lkb->lkb_lvbptr)
0449         len += ls->ls_lvblen;
0450 
0451     error = create_rcom(ls, r->res_nodeid, DLM_RCOM_LOCK, len, &rc, &mh);
0452     if (error)
0453         goto out;
0454 
0455     rl = (struct rcom_lock *) rc->rc_buf;
0456     pack_rcom_lock(r, lkb, rl);
0457     rc->rc_id = cpu_to_le64((uintptr_t)r);
0458 
0459     send_rcom(mh, rc);
0460  out:
0461     return error;
0462 }
0463 
0464 /* needs at least dlm_rcom + rcom_lock */
0465 static void receive_rcom_lock(struct dlm_ls *ls, struct dlm_rcom *rc_in)
0466 {
0467     struct dlm_rcom *rc;
0468     struct dlm_mhandle *mh;
0469     int error, nodeid = le32_to_cpu(rc_in->rc_header.h_nodeid);
0470 
0471     dlm_recover_master_copy(ls, rc_in);
0472 
0473     error = create_rcom(ls, nodeid, DLM_RCOM_LOCK_REPLY,
0474                 sizeof(struct rcom_lock), &rc, &mh);
0475     if (error)
0476         return;
0477 
0478     /* We send back the same rcom_lock struct we received, but
0479        dlm_recover_master_copy() has filled in rl_remid and rl_result */
0480 
0481     memcpy(rc->rc_buf, rc_in->rc_buf, sizeof(struct rcom_lock));
0482     rc->rc_id = rc_in->rc_id;
0483     rc->rc_seq_reply = rc_in->rc_seq;
0484 
0485     send_rcom(mh, rc);
0486 }
0487 
0488 /* If the lockspace doesn't exist then still send a status message
0489    back; it's possible that it just doesn't have its global_id yet. */
0490 
0491 int dlm_send_ls_not_ready(int nodeid, struct dlm_rcom *rc_in)
0492 {
0493     struct dlm_rcom *rc;
0494     struct rcom_config *rf;
0495     struct dlm_mhandle *mh;
0496     char *mb;
0497     int mb_len = sizeof(struct dlm_rcom) + sizeof(struct rcom_config);
0498 
0499     mh = dlm_midcomms_get_mhandle(nodeid, mb_len, GFP_NOFS, &mb);
0500     if (!mh)
0501         return -ENOBUFS;
0502 
0503     rc = (struct dlm_rcom *) mb;
0504 
0505     rc->rc_header.h_version = cpu_to_le32(DLM_HEADER_MAJOR | DLM_HEADER_MINOR);
0506     rc->rc_header.u.h_lockspace = rc_in->rc_header.u.h_lockspace;
0507     rc->rc_header.h_nodeid = cpu_to_le32(dlm_our_nodeid());
0508     rc->rc_header.h_length = cpu_to_le16(mb_len);
0509     rc->rc_header.h_cmd = DLM_RCOM;
0510 
0511     rc->rc_type = cpu_to_le32(DLM_RCOM_STATUS_REPLY);
0512     rc->rc_id = rc_in->rc_id;
0513     rc->rc_seq_reply = rc_in->rc_seq;
0514     rc->rc_result = cpu_to_le32(-ESRCH);
0515 
0516     rf = (struct rcom_config *) rc->rc_buf;
0517     rf->rf_lvblen = cpu_to_le32(~0U);
0518 
0519     dlm_midcomms_commit_mhandle(mh);
0520 
0521     return 0;
0522 }
0523 
0524 /*
0525  * Ignore messages for stage Y before we set
0526  * recover_status bit for stage X:
0527  *
0528  * recover_status = 0
0529  *
0530  * dlm_recover_members()
0531  * - send nothing
0532  * - recv nothing
0533  * - ignore NAMES, NAMES_REPLY
0534  * - ignore LOOKUP, LOOKUP_REPLY
0535  * - ignore LOCK, LOCK_REPLY
0536  *
0537  * recover_status |= NODES
0538  *
0539  * dlm_recover_members_wait()
0540  *
0541  * dlm_recover_directory()
0542  * - send NAMES
0543  * - recv NAMES_REPLY
0544  * - ignore LOOKUP, LOOKUP_REPLY
0545  * - ignore LOCK, LOCK_REPLY
0546  *
0547  * recover_status |= DIR
0548  *
0549  * dlm_recover_directory_wait()
0550  *
0551  * dlm_recover_masters()
0552  * - send LOOKUP
0553  * - recv LOOKUP_REPLY
0554  *
0555  * dlm_recover_locks()
0556  * - send LOCKS
0557  * - recv LOCKS_REPLY
0558  *
0559  * recover_status |= LOCKS
0560  *
0561  * dlm_recover_locks_wait()
0562  *
0563  * recover_status |= DONE
0564  */
0565 
0566 /* Called by dlm_recv; corresponds to dlm_receive_message() but special
0567    recovery-only comms are sent through here. */
0568 
0569 void dlm_receive_rcom(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid)
0570 {
0571     int lock_size = sizeof(struct dlm_rcom) + sizeof(struct rcom_lock);
0572     int stop, reply = 0, names = 0, lookup = 0, lock = 0;
0573     uint32_t status;
0574     uint64_t seq;
0575 
0576     switch (rc->rc_type) {
0577     case cpu_to_le32(DLM_RCOM_STATUS_REPLY):
0578         reply = 1;
0579         break;
0580     case cpu_to_le32(DLM_RCOM_NAMES):
0581         names = 1;
0582         break;
0583     case cpu_to_le32(DLM_RCOM_NAMES_REPLY):
0584         names = 1;
0585         reply = 1;
0586         break;
0587     case cpu_to_le32(DLM_RCOM_LOOKUP):
0588         lookup = 1;
0589         break;
0590     case cpu_to_le32(DLM_RCOM_LOOKUP_REPLY):
0591         lookup = 1;
0592         reply = 1;
0593         break;
0594     case cpu_to_le32(DLM_RCOM_LOCK):
0595         lock = 1;
0596         break;
0597     case cpu_to_le32(DLM_RCOM_LOCK_REPLY):
0598         lock = 1;
0599         reply = 1;
0600         break;
0601     }
0602 
0603     spin_lock(&ls->ls_recover_lock);
0604     status = ls->ls_recover_status;
0605     stop = dlm_recovery_stopped(ls);
0606     seq = ls->ls_recover_seq;
0607     spin_unlock(&ls->ls_recover_lock);
0608 
0609     if (stop && (rc->rc_type != cpu_to_le32(DLM_RCOM_STATUS)))
0610         goto ignore;
0611 
0612     if (reply && (le64_to_cpu(rc->rc_seq_reply) != seq))
0613         goto ignore;
0614 
0615     if (!(status & DLM_RS_NODES) && (names || lookup || lock))
0616         goto ignore;
0617 
0618     if (!(status & DLM_RS_DIR) && (lookup || lock))
0619         goto ignore;
0620 
0621     switch (rc->rc_type) {
0622     case cpu_to_le32(DLM_RCOM_STATUS):
0623         receive_rcom_status(ls, rc);
0624         break;
0625 
0626     case cpu_to_le32(DLM_RCOM_NAMES):
0627         receive_rcom_names(ls, rc);
0628         break;
0629 
0630     case cpu_to_le32(DLM_RCOM_LOOKUP):
0631         receive_rcom_lookup(ls, rc);
0632         break;
0633 
0634     case cpu_to_le32(DLM_RCOM_LOCK):
0635         if (le16_to_cpu(rc->rc_header.h_length) < lock_size)
0636             goto Eshort;
0637         receive_rcom_lock(ls, rc);
0638         break;
0639 
0640     case cpu_to_le32(DLM_RCOM_STATUS_REPLY):
0641         receive_sync_reply(ls, rc);
0642         break;
0643 
0644     case cpu_to_le32(DLM_RCOM_NAMES_REPLY):
0645         receive_sync_reply(ls, rc);
0646         break;
0647 
0648     case cpu_to_le32(DLM_RCOM_LOOKUP_REPLY):
0649         receive_rcom_lookup_reply(ls, rc);
0650         break;
0651 
0652     case cpu_to_le32(DLM_RCOM_LOCK_REPLY):
0653         if (le16_to_cpu(rc->rc_header.h_length) < lock_size)
0654             goto Eshort;
0655         dlm_recover_process_copy(ls, rc);
0656         break;
0657 
0658     default:
0659         log_error(ls, "receive_rcom bad type %d",
0660               le32_to_cpu(rc->rc_type));
0661     }
0662     return;
0663 
0664 ignore:
0665     log_limit(ls, "dlm_receive_rcom ignore msg %d "
0666           "from %d %llu %llu recover seq %llu sts %x gen %u",
0667            le32_to_cpu(rc->rc_type),
0668            nodeid,
0669            (unsigned long long)le64_to_cpu(rc->rc_seq),
0670            (unsigned long long)le64_to_cpu(rc->rc_seq_reply),
0671            (unsigned long long)seq,
0672            status, ls->ls_generation);
0673     return;
0674 Eshort:
0675     log_error(ls, "recovery message %d from %d is too short",
0676           le32_to_cpu(rc->rc_type), nodeid);
0677 }
0678
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