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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
5 */
6
7#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8
9#include <linux/spinlock.h>
10#include <linux/completion.h>
11#include <linux/buffer_head.h>
12#include <linux/crc32.h>
13#include <linux/gfs2_ondisk.h>
14#include <linux/delay.h>
15#include <linux/uaccess.h>
16
17#include "gfs2.h"
18#include "incore.h"
19#include "glock.h"
20#include "glops.h"
21#include "log.h"
22#include "lops.h"
23#include "recovery.h"
24#include "rgrp.h"
25#include "super.h"
26#include "util.h"
27
28struct kmem_cache *gfs2_glock_cachep __read_mostly;
29struct kmem_cache *gfs2_glock_aspace_cachep __read_mostly;
30struct kmem_cache *gfs2_inode_cachep __read_mostly;
31struct kmem_cache *gfs2_bufdata_cachep __read_mostly;
32struct kmem_cache *gfs2_rgrpd_cachep __read_mostly;
33struct kmem_cache *gfs2_quotad_cachep __read_mostly;
34struct kmem_cache *gfs2_qadata_cachep __read_mostly;
35struct kmem_cache *gfs2_trans_cachep __read_mostly;
36mempool_t *gfs2_page_pool __read_mostly;
37
38void gfs2_assert_i(struct gfs2_sbd *sdp)
39{
40 fs_emerg(sdp, "fatal assertion failed\n");
41}
42
43/**
44 * check_journal_clean - Make sure a journal is clean for a spectator mount
45 * @sdp: The GFS2 superblock
46 * @jd: The journal descriptor
47 * @verbose: Show more prints in the log
48 *
49 * Returns: 0 if the journal is clean or locked, else an error
50 */
51int check_journal_clean(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd,
52 bool verbose)
53{
54 int error;
55 struct gfs2_holder j_gh;
56 struct gfs2_log_header_host head;
57 struct gfs2_inode *ip;
58
59 ip = GFS2_I(jd->jd_inode);
60 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_NOEXP |
61 GL_EXACT | GL_NOCACHE, &j_gh);
62 if (error) {
63 if (verbose)
64 fs_err(sdp, "Error %d locking journal for spectator "
65 "mount.\n", error);
66 return -EPERM;
67 }
68 error = gfs2_jdesc_check(jd);
69 if (error) {
70 if (verbose)
71 fs_err(sdp, "Error checking journal for spectator "
72 "mount.\n");
73 goto out_unlock;
74 }
75 error = gfs2_find_jhead(jd, &head, false);
76 if (error) {
77 if (verbose)
78 fs_err(sdp, "Error parsing journal for spectator "
79 "mount.\n");
80 goto out_unlock;
81 }
82 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
83 error = -EPERM;
84 if (verbose)
85 fs_err(sdp, "jid=%u: Journal is dirty, so the first "
86 "mounter must not be a spectator.\n",
87 jd->jd_jid);
88 }
89
90out_unlock:
91 gfs2_glock_dq_uninit(&j_gh);
92 return error;
93}
94
95/**
96 * gfs2_freeze_lock - hold the freeze glock
97 * @sdp: the superblock
98 * @freeze_gh: pointer to the requested holder
99 * @caller_flags: any additional flags needed by the caller
100 */
101int gfs2_freeze_lock(struct gfs2_sbd *sdp, struct gfs2_holder *freeze_gh,
102 int caller_flags)
103{
104 int flags = LM_FLAG_NOEXP | GL_EXACT | caller_flags;
105 int error;
106
107 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, flags,
108 freeze_gh);
109 if (error && error != GLR_TRYFAILED)
110 fs_err(sdp, "can't lock the freeze lock: %d\n", error);
111 return error;
112}
113
114void gfs2_freeze_unlock(struct gfs2_holder *freeze_gh)
115{
116 if (gfs2_holder_initialized(freeze_gh))
117 gfs2_glock_dq_uninit(freeze_gh);
118}
119
120static void signal_our_withdraw(struct gfs2_sbd *sdp)
121{
122 struct gfs2_glock *live_gl = sdp->sd_live_gh.gh_gl;
123 struct inode *inode;
124 struct gfs2_inode *ip;
125 struct gfs2_glock *i_gl;
126 u64 no_formal_ino;
127 int log_write_allowed = test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
128 int ret = 0;
129 int tries;
130
131 if (test_bit(SDF_NORECOVERY, &sdp->sd_flags) || !sdp->sd_jdesc)
132 return;
133
134 gfs2_ail_drain(sdp); /* frees all transactions */
135 inode = sdp->sd_jdesc->jd_inode;
136 ip = GFS2_I(inode);
137 i_gl = ip->i_gl;
138 no_formal_ino = ip->i_no_formal_ino;
139
140 /* Prevent any glock dq until withdraw recovery is complete */
141 set_bit(SDF_WITHDRAW_RECOVERY, &sdp->sd_flags);
142 /*
143 * Don't tell dlm we're bailing until we have no more buffers in the
144 * wind. If journal had an IO error, the log code should just purge
145 * the outstanding buffers rather than submitting new IO. Making the
146 * file system read-only will flush the journal, etc.
147 *
148 * During a normal unmount, gfs2_make_fs_ro calls gfs2_log_shutdown
149 * which clears SDF_JOURNAL_LIVE. In a withdraw, we must not write
150 * any UNMOUNT log header, so we can't call gfs2_log_shutdown, and
151 * therefore we need to clear SDF_JOURNAL_LIVE manually.
152 */
153 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
154 if (!sb_rdonly(sdp->sd_vfs)) {
155 struct gfs2_holder freeze_gh;
156
157 gfs2_holder_mark_uninitialized(&freeze_gh);
158 if (sdp->sd_freeze_gl &&
159 !gfs2_glock_is_locked_by_me(sdp->sd_freeze_gl)) {
160 ret = gfs2_freeze_lock(sdp, &freeze_gh,
161 log_write_allowed ? 0 : LM_FLAG_TRY);
162 if (ret == GLR_TRYFAILED)
163 ret = 0;
164 }
165 if (!ret)
166 gfs2_make_fs_ro(sdp);
167 /*
168 * Dequeue any pending non-system glock holders that can no
169 * longer be granted because the file system is withdrawn.
170 */
171 gfs2_gl_dq_holders(sdp);
172 gfs2_freeze_unlock(&freeze_gh);
173 }
174
175 if (sdp->sd_lockstruct.ls_ops->lm_lock == NULL) { /* lock_nolock */
176 if (!ret)
177 ret = -EIO;
178 clear_bit(SDF_WITHDRAW_RECOVERY, &sdp->sd_flags);
179 goto skip_recovery;
180 }
181 /*
182 * Drop the glock for our journal so another node can recover it.
183 */
184 if (gfs2_holder_initialized(&sdp->sd_journal_gh)) {
185 gfs2_glock_dq_wait(&sdp->sd_journal_gh);
186 gfs2_holder_uninit(&sdp->sd_journal_gh);
187 }
188 sdp->sd_jinode_gh.gh_flags |= GL_NOCACHE;
189 gfs2_glock_dq(&sdp->sd_jinode_gh);
190 if (test_bit(SDF_FS_FROZEN, &sdp->sd_flags)) {
191 /* Make sure gfs2_unfreeze works if partially-frozen */
192 flush_work(&sdp->sd_freeze_work);
193 atomic_set(&sdp->sd_freeze_state, SFS_FROZEN);
194 thaw_super(sdp->sd_vfs);
195 } else {
196 wait_on_bit(&i_gl->gl_flags, GLF_DEMOTE,
197 TASK_UNINTERRUPTIBLE);
198 }
199
200 /*
201 * holder_uninit to force glock_put, to force dlm to let go
202 */
203 gfs2_holder_uninit(&sdp->sd_jinode_gh);
204
205 /*
206 * Note: We need to be careful here:
207 * Our iput of jd_inode will evict it. The evict will dequeue its
208 * glock, but the glock dq will wait for the withdraw unless we have
209 * exception code in glock_dq.
210 */
211 iput(inode);
212 sdp->sd_jdesc->jd_inode = NULL;
213 /*
214 * Wait until the journal inode's glock is freed. This allows try locks
215 * on other nodes to be successful, otherwise we remain the owner of
216 * the glock as far as dlm is concerned.
217 */
218 if (i_gl->gl_ops->go_free) {
219 set_bit(GLF_FREEING, &i_gl->gl_flags);
220 wait_on_bit(&i_gl->gl_flags, GLF_FREEING, TASK_UNINTERRUPTIBLE);
221 }
222
223 /*
224 * Dequeue the "live" glock, but keep a reference so it's never freed.
225 */
226 gfs2_glock_hold(live_gl);
227 gfs2_glock_dq_wait(&sdp->sd_live_gh);
228 /*
229 * We enqueue the "live" glock in EX so that all other nodes
230 * get a demote request and act on it. We don't really want the
231 * lock in EX, so we send a "try" lock with 1CB to produce a callback.
232 */
233 fs_warn(sdp, "Requesting recovery of jid %d.\n",
234 sdp->sd_lockstruct.ls_jid);
235 gfs2_holder_reinit(LM_ST_EXCLUSIVE,
236 LM_FLAG_TRY_1CB | LM_FLAG_NOEXP | GL_NOPID,
237 &sdp->sd_live_gh);
238 msleep(GL_GLOCK_MAX_HOLD);
239 /*
240 * This will likely fail in a cluster, but succeed standalone:
241 */
242 ret = gfs2_glock_nq(&sdp->sd_live_gh);
243
244 /*
245 * If we actually got the "live" lock in EX mode, there are no other
246 * nodes available to replay our journal. So we try to replay it
247 * ourselves. We hold the "live" glock to prevent other mounters
248 * during recovery, then just dequeue it and reacquire it in our
249 * normal SH mode. Just in case the problem that caused us to
250 * withdraw prevents us from recovering our journal (e.g. io errors
251 * and such) we still check if the journal is clean before proceeding
252 * but we may wait forever until another mounter does the recovery.
253 */
254 if (ret == 0) {
255 fs_warn(sdp, "No other mounters found. Trying to recover our "
256 "own journal jid %d.\n", sdp->sd_lockstruct.ls_jid);
257 if (gfs2_recover_journal(sdp->sd_jdesc, 1))
258 fs_warn(sdp, "Unable to recover our journal jid %d.\n",
259 sdp->sd_lockstruct.ls_jid);
260 gfs2_glock_dq_wait(&sdp->sd_live_gh);
261 gfs2_holder_reinit(LM_ST_SHARED,
262 LM_FLAG_NOEXP | GL_EXACT | GL_NOPID,
263 &sdp->sd_live_gh);
264 gfs2_glock_nq(&sdp->sd_live_gh);
265 }
266
267 gfs2_glock_queue_put(live_gl); /* drop extra reference we acquired */
268 clear_bit(SDF_WITHDRAW_RECOVERY, &sdp->sd_flags);
269
270 /*
271 * At this point our journal is evicted, so we need to get a new inode
272 * for it. Once done, we need to call gfs2_find_jhead which
273 * calls gfs2_map_journal_extents to map it for us again.
274 *
275 * Note that we don't really want it to look up a FREE block. The
276 * GFS2_BLKST_FREE simply overrides a block check in gfs2_inode_lookup
277 * which would otherwise fail because it requires grabbing an rgrp
278 * glock, which would fail with -EIO because we're withdrawing.
279 */
280 inode = gfs2_inode_lookup(sdp->sd_vfs, DT_UNKNOWN,
281 sdp->sd_jdesc->jd_no_addr, no_formal_ino,
282 GFS2_BLKST_FREE);
283 if (IS_ERR(inode)) {
284 fs_warn(sdp, "Reprocessing of jid %d failed with %ld.\n",
285 sdp->sd_lockstruct.ls_jid, PTR_ERR(inode));
286 goto skip_recovery;
287 }
288 sdp->sd_jdesc->jd_inode = inode;
289 d_mark_dontcache(inode);
290
291 /*
292 * Now wait until recovery is complete.
293 */
294 for (tries = 0; tries < 10; tries++) {
295 ret = check_journal_clean(sdp, sdp->sd_jdesc, false);
296 if (!ret)
297 break;
298 msleep(HZ);
299 fs_warn(sdp, "Waiting for journal recovery jid %d.\n",
300 sdp->sd_lockstruct.ls_jid);
301 }
302skip_recovery:
303 if (!ret)
304 fs_warn(sdp, "Journal recovery complete for jid %d.\n",
305 sdp->sd_lockstruct.ls_jid);
306 else
307 fs_warn(sdp, "Journal recovery skipped for jid %d until next "
308 "mount.\n", sdp->sd_lockstruct.ls_jid);
309 fs_warn(sdp, "Glock dequeues delayed: %lu\n", sdp->sd_glock_dqs_held);
310 sdp->sd_glock_dqs_held = 0;
311 wake_up_bit(&sdp->sd_flags, SDF_WITHDRAW_RECOVERY);
312}
313
314void gfs2_lm(struct gfs2_sbd *sdp, const char *fmt, ...)
315{
316 struct va_format vaf;
317 va_list args;
318
319 if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW &&
320 test_bit(SDF_WITHDRAWN, &sdp->sd_flags))
321 return;
322
323 va_start(args, fmt);
324 vaf.fmt = fmt;
325 vaf.va = &args;
326 fs_err(sdp, "%pV", &vaf);
327 va_end(args);
328}
329
330int gfs2_withdraw(struct gfs2_sbd *sdp)
331{
332 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
333 const struct lm_lockops *lm = ls->ls_ops;
334
335 if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW &&
336 test_and_set_bit(SDF_WITHDRAWN, &sdp->sd_flags)) {
337 if (!test_bit(SDF_WITHDRAW_IN_PROG, &sdp->sd_flags))
338 return -1;
339
340 wait_on_bit(&sdp->sd_flags, SDF_WITHDRAW_IN_PROG,
341 TASK_UNINTERRUPTIBLE);
342 return -1;
343 }
344
345 set_bit(SDF_WITHDRAW_IN_PROG, &sdp->sd_flags);
346
347 if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW) {
348 fs_err(sdp, "about to withdraw this file system\n");
349 BUG_ON(sdp->sd_args.ar_debug);
350
351 signal_our_withdraw(sdp);
352
353 kobject_uevent(&sdp->sd_kobj, KOBJ_OFFLINE);
354
355 if (!strcmp(sdp->sd_lockstruct.ls_ops->lm_proto_name, "lock_dlm"))
356 wait_for_completion(&sdp->sd_wdack);
357
358 if (lm->lm_unmount) {
359 fs_err(sdp, "telling LM to unmount\n");
360 lm->lm_unmount(sdp);
361 }
362 set_bit(SDF_SKIP_DLM_UNLOCK, &sdp->sd_flags);
363 fs_err(sdp, "File system withdrawn\n");
364 dump_stack();
365 clear_bit(SDF_WITHDRAW_IN_PROG, &sdp->sd_flags);
366 smp_mb__after_atomic();
367 wake_up_bit(&sdp->sd_flags, SDF_WITHDRAW_IN_PROG);
368 }
369
370 if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
371 panic("GFS2: fsid=%s: panic requested\n", sdp->sd_fsname);
372
373 return -1;
374}
375
376/*
377 * gfs2_assert_withdraw_i - Cause the machine to withdraw if @assertion is false
378 */
379
380void gfs2_assert_withdraw_i(struct gfs2_sbd *sdp, char *assertion,
381 const char *function, char *file, unsigned int line,
382 bool delayed)
383{
384 if (gfs2_withdrawn(sdp))
385 return;
386
387 fs_err(sdp,
388 "fatal: assertion \"%s\" failed\n"
389 " function = %s, file = %s, line = %u\n",
390 assertion, function, file, line);
391
392 /*
393 * If errors=panic was specified on mount, it won't help to delay the
394 * withdraw.
395 */
396 if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
397 delayed = false;
398
399 if (delayed)
400 gfs2_withdraw_delayed(sdp);
401 else
402 gfs2_withdraw(sdp);
403 dump_stack();
404}
405
406/*
407 * gfs2_assert_warn_i - Print a message to the console if @assertion is false
408 */
409
410void gfs2_assert_warn_i(struct gfs2_sbd *sdp, char *assertion,
411 const char *function, char *file, unsigned int line)
412{
413 if (time_before(jiffies,
414 sdp->sd_last_warning +
415 gfs2_tune_get(sdp, gt_complain_secs) * HZ))
416 return;
417
418 if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW)
419 fs_warn(sdp, "warning: assertion \"%s\" failed at function = %s, file = %s, line = %u\n",
420 assertion, function, file, line);
421
422 if (sdp->sd_args.ar_debug)
423 BUG();
424 else
425 dump_stack();
426
427 if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
428 panic("GFS2: fsid=%s: warning: assertion \"%s\" failed\n"
429 "GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
430 sdp->sd_fsname, assertion,
431 sdp->sd_fsname, function, file, line);
432
433 sdp->sd_last_warning = jiffies;
434}
435
436/*
437 * gfs2_consist_i - Flag a filesystem consistency error and withdraw
438 */
439
440void gfs2_consist_i(struct gfs2_sbd *sdp, const char *function,
441 char *file, unsigned int line)
442{
443 gfs2_lm(sdp,
444 "fatal: filesystem consistency error - function = %s, file = %s, line = %u\n",
445 function, file, line);
446 gfs2_withdraw(sdp);
447}
448
449/*
450 * gfs2_consist_inode_i - Flag an inode consistency error and withdraw
451 */
452
453void gfs2_consist_inode_i(struct gfs2_inode *ip,
454 const char *function, char *file, unsigned int line)
455{
456 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
457
458 gfs2_lm(sdp,
459 "fatal: filesystem consistency error\n"
460 " inode = %llu %llu\n"
461 " function = %s, file = %s, line = %u\n",
462 (unsigned long long)ip->i_no_formal_ino,
463 (unsigned long long)ip->i_no_addr,
464 function, file, line);
465 gfs2_dump_glock(NULL, ip->i_gl, 1);
466 gfs2_withdraw(sdp);
467}
468
469/*
470 * gfs2_consist_rgrpd_i - Flag a RG consistency error and withdraw
471 */
472
473void gfs2_consist_rgrpd_i(struct gfs2_rgrpd *rgd,
474 const char *function, char *file, unsigned int line)
475{
476 struct gfs2_sbd *sdp = rgd->rd_sbd;
477 char fs_id_buf[sizeof(sdp->sd_fsname) + 7];
478
479 sprintf(fs_id_buf, "fsid=%s: ", sdp->sd_fsname);
480 gfs2_rgrp_dump(NULL, rgd, fs_id_buf);
481 gfs2_lm(sdp,
482 "fatal: filesystem consistency error\n"
483 " RG = %llu\n"
484 " function = %s, file = %s, line = %u\n",
485 (unsigned long long)rgd->rd_addr,
486 function, file, line);
487 gfs2_dump_glock(NULL, rgd->rd_gl, 1);
488 gfs2_withdraw(sdp);
489}
490
491/*
492 * gfs2_meta_check_ii - Flag a magic number consistency error and withdraw
493 * Returns: -1 if this call withdrew the machine,
494 * -2 if it was already withdrawn
495 */
496
497int gfs2_meta_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
498 const char *type, const char *function, char *file,
499 unsigned int line)
500{
501 int me;
502
503 gfs2_lm(sdp,
504 "fatal: invalid metadata block\n"
505 " bh = %llu (%s)\n"
506 " function = %s, file = %s, line = %u\n",
507 (unsigned long long)bh->b_blocknr, type,
508 function, file, line);
509 me = gfs2_withdraw(sdp);
510 return (me) ? -1 : -2;
511}
512
513/*
514 * gfs2_metatype_check_ii - Flag a metadata type consistency error and withdraw
515 * Returns: -1 if this call withdrew the machine,
516 * -2 if it was already withdrawn
517 */
518
519int gfs2_metatype_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
520 u16 type, u16 t, const char *function,
521 char *file, unsigned int line)
522{
523 int me;
524
525 gfs2_lm(sdp,
526 "fatal: invalid metadata block\n"
527 " bh = %llu (type: exp=%u, found=%u)\n"
528 " function = %s, file = %s, line = %u\n",
529 (unsigned long long)bh->b_blocknr, type, t,
530 function, file, line);
531 me = gfs2_withdraw(sdp);
532 return (me) ? -1 : -2;
533}
534
535/*
536 * gfs2_io_error_i - Flag an I/O error and withdraw
537 * Returns: -1 if this call withdrew the machine,
538 * 0 if it was already withdrawn
539 */
540
541int gfs2_io_error_i(struct gfs2_sbd *sdp, const char *function, char *file,
542 unsigned int line)
543{
544 gfs2_lm(sdp,
545 "fatal: I/O error\n"
546 " function = %s, file = %s, line = %u\n",
547 function, file, line);
548 return gfs2_withdraw(sdp);
549}
550
551/*
552 * gfs2_io_error_bh_i - Flag a buffer I/O error
553 * @withdraw: withdraw the filesystem
554 */
555
556void gfs2_io_error_bh_i(struct gfs2_sbd *sdp, struct buffer_head *bh,
557 const char *function, char *file, unsigned int line,
558 bool withdraw)
559{
560 if (gfs2_withdrawn(sdp))
561 return;
562
563 fs_err(sdp, "fatal: I/O error\n"
564 " block = %llu\n"
565 " function = %s, file = %s, line = %u\n",
566 (unsigned long long)bh->b_blocknr, function, file, line);
567 if (withdraw)
568 gfs2_withdraw(sdp);
569}
570
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
5 */
6
7#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8
9#include <linux/spinlock.h>
10#include <linux/completion.h>
11#include <linux/buffer_head.h>
12#include <linux/kthread.h>
13#include <linux/crc32.h>
14#include <linux/gfs2_ondisk.h>
15#include <linux/delay.h>
16#include <linux/uaccess.h>
17
18#include "gfs2.h"
19#include "incore.h"
20#include "glock.h"
21#include "glops.h"
22#include "log.h"
23#include "lops.h"
24#include "recovery.h"
25#include "rgrp.h"
26#include "super.h"
27#include "util.h"
28
29struct kmem_cache *gfs2_glock_cachep __read_mostly;
30struct kmem_cache *gfs2_glock_aspace_cachep __read_mostly;
31struct kmem_cache *gfs2_inode_cachep __read_mostly;
32struct kmem_cache *gfs2_bufdata_cachep __read_mostly;
33struct kmem_cache *gfs2_rgrpd_cachep __read_mostly;
34struct kmem_cache *gfs2_quotad_cachep __read_mostly;
35struct kmem_cache *gfs2_qadata_cachep __read_mostly;
36struct kmem_cache *gfs2_trans_cachep __read_mostly;
37mempool_t *gfs2_page_pool __read_mostly;
38
39void gfs2_assert_i(struct gfs2_sbd *sdp)
40{
41 fs_emerg(sdp, "fatal assertion failed\n");
42}
43
44/**
45 * check_journal_clean - Make sure a journal is clean for a spectator mount
46 * @sdp: The GFS2 superblock
47 * @jd: The journal descriptor
48 * @verbose: Show more prints in the log
49 *
50 * Returns: 0 if the journal is clean or locked, else an error
51 */
52int check_journal_clean(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd,
53 bool verbose)
54{
55 int error;
56 struct gfs2_holder j_gh;
57 struct gfs2_log_header_host head;
58 struct gfs2_inode *ip;
59
60 ip = GFS2_I(jd->jd_inode);
61 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_NOEXP |
62 GL_EXACT | GL_NOCACHE, &j_gh);
63 if (error) {
64 if (verbose)
65 fs_err(sdp, "Error %d locking journal for spectator "
66 "mount.\n", error);
67 return -EPERM;
68 }
69 error = gfs2_jdesc_check(jd);
70 if (error) {
71 if (verbose)
72 fs_err(sdp, "Error checking journal for spectator "
73 "mount.\n");
74 goto out_unlock;
75 }
76 error = gfs2_find_jhead(jd, &head, false);
77 if (error) {
78 if (verbose)
79 fs_err(sdp, "Error parsing journal for spectator "
80 "mount.\n");
81 goto out_unlock;
82 }
83 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
84 error = -EPERM;
85 if (verbose)
86 fs_err(sdp, "jid=%u: Journal is dirty, so the first "
87 "mounter must not be a spectator.\n",
88 jd->jd_jid);
89 }
90
91out_unlock:
92 gfs2_glock_dq_uninit(&j_gh);
93 return error;
94}
95
96/**
97 * gfs2_freeze_lock_shared - hold the freeze glock
98 * @sdp: the superblock
99 */
100int gfs2_freeze_lock_shared(struct gfs2_sbd *sdp)
101{
102 int error;
103
104 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED,
105 LM_FLAG_NOEXP | GL_EXACT,
106 &sdp->sd_freeze_gh);
107 if (error)
108 fs_err(sdp, "can't lock the freeze glock: %d\n", error);
109 return error;
110}
111
112void gfs2_freeze_unlock(struct gfs2_holder *freeze_gh)
113{
114 if (gfs2_holder_initialized(freeze_gh))
115 gfs2_glock_dq_uninit(freeze_gh);
116}
117
118static void signal_our_withdraw(struct gfs2_sbd *sdp)
119{
120 struct gfs2_glock *live_gl = sdp->sd_live_gh.gh_gl;
121 struct inode *inode;
122 struct gfs2_inode *ip;
123 struct gfs2_glock *i_gl;
124 u64 no_formal_ino;
125 int ret = 0;
126 int tries;
127
128 if (test_bit(SDF_NORECOVERY, &sdp->sd_flags) || !sdp->sd_jdesc)
129 return;
130
131 gfs2_ail_drain(sdp); /* frees all transactions */
132 inode = sdp->sd_jdesc->jd_inode;
133 ip = GFS2_I(inode);
134 i_gl = ip->i_gl;
135 no_formal_ino = ip->i_no_formal_ino;
136
137 /* Prevent any glock dq until withdraw recovery is complete */
138 set_bit(SDF_WITHDRAW_RECOVERY, &sdp->sd_flags);
139 /*
140 * Don't tell dlm we're bailing until we have no more buffers in the
141 * wind. If journal had an IO error, the log code should just purge
142 * the outstanding buffers rather than submitting new IO. Making the
143 * file system read-only will flush the journal, etc.
144 *
145 * During a normal unmount, gfs2_make_fs_ro calls gfs2_log_shutdown
146 * which clears SDF_JOURNAL_LIVE. In a withdraw, we must not write
147 * any UNMOUNT log header, so we can't call gfs2_log_shutdown, and
148 * therefore we need to clear SDF_JOURNAL_LIVE manually.
149 */
150 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
151 if (!sb_rdonly(sdp->sd_vfs)) {
152 bool locked = mutex_trylock(&sdp->sd_freeze_mutex);
153
154 wake_up(&sdp->sd_logd_waitq);
155 wake_up(&sdp->sd_quota_wait);
156
157 wait_event_timeout(sdp->sd_log_waitq,
158 gfs2_log_is_empty(sdp),
159 HZ * 5);
160
161 sdp->sd_vfs->s_flags |= SB_RDONLY;
162
163 if (locked)
164 mutex_unlock(&sdp->sd_freeze_mutex);
165
166 /*
167 * Dequeue any pending non-system glock holders that can no
168 * longer be granted because the file system is withdrawn.
169 */
170 gfs2_gl_dq_holders(sdp);
171 }
172
173 if (sdp->sd_lockstruct.ls_ops->lm_lock == NULL) { /* lock_nolock */
174 if (!ret)
175 ret = -EIO;
176 clear_bit(SDF_WITHDRAW_RECOVERY, &sdp->sd_flags);
177 goto skip_recovery;
178 }
179 /*
180 * Drop the glock for our journal so another node can recover it.
181 */
182 if (gfs2_holder_initialized(&sdp->sd_journal_gh)) {
183 gfs2_glock_dq_wait(&sdp->sd_journal_gh);
184 gfs2_holder_uninit(&sdp->sd_journal_gh);
185 }
186 sdp->sd_jinode_gh.gh_flags |= GL_NOCACHE;
187 gfs2_glock_dq(&sdp->sd_jinode_gh);
188 gfs2_thaw_freeze_initiator(sdp->sd_vfs);
189 wait_on_bit(&i_gl->gl_flags, GLF_DEMOTE, TASK_UNINTERRUPTIBLE);
190
191 /*
192 * holder_uninit to force glock_put, to force dlm to let go
193 */
194 gfs2_holder_uninit(&sdp->sd_jinode_gh);
195
196 /*
197 * Note: We need to be careful here:
198 * Our iput of jd_inode will evict it. The evict will dequeue its
199 * glock, but the glock dq will wait for the withdraw unless we have
200 * exception code in glock_dq.
201 */
202 iput(inode);
203 sdp->sd_jdesc->jd_inode = NULL;
204 /*
205 * Wait until the journal inode's glock is freed. This allows try locks
206 * on other nodes to be successful, otherwise we remain the owner of
207 * the glock as far as dlm is concerned.
208 */
209 if (i_gl->gl_ops->go_free) {
210 set_bit(GLF_FREEING, &i_gl->gl_flags);
211 wait_on_bit(&i_gl->gl_flags, GLF_FREEING, TASK_UNINTERRUPTIBLE);
212 }
213
214 /*
215 * Dequeue the "live" glock, but keep a reference so it's never freed.
216 */
217 gfs2_glock_hold(live_gl);
218 gfs2_glock_dq_wait(&sdp->sd_live_gh);
219 /*
220 * We enqueue the "live" glock in EX so that all other nodes
221 * get a demote request and act on it. We don't really want the
222 * lock in EX, so we send a "try" lock with 1CB to produce a callback.
223 */
224 fs_warn(sdp, "Requesting recovery of jid %d.\n",
225 sdp->sd_lockstruct.ls_jid);
226 gfs2_holder_reinit(LM_ST_EXCLUSIVE,
227 LM_FLAG_TRY_1CB | LM_FLAG_NOEXP | GL_NOPID,
228 &sdp->sd_live_gh);
229 msleep(GL_GLOCK_MAX_HOLD);
230 /*
231 * This will likely fail in a cluster, but succeed standalone:
232 */
233 ret = gfs2_glock_nq(&sdp->sd_live_gh);
234
235 /*
236 * If we actually got the "live" lock in EX mode, there are no other
237 * nodes available to replay our journal. So we try to replay it
238 * ourselves. We hold the "live" glock to prevent other mounters
239 * during recovery, then just dequeue it and reacquire it in our
240 * normal SH mode. Just in case the problem that caused us to
241 * withdraw prevents us from recovering our journal (e.g. io errors
242 * and such) we still check if the journal is clean before proceeding
243 * but we may wait forever until another mounter does the recovery.
244 */
245 if (ret == 0) {
246 fs_warn(sdp, "No other mounters found. Trying to recover our "
247 "own journal jid %d.\n", sdp->sd_lockstruct.ls_jid);
248 if (gfs2_recover_journal(sdp->sd_jdesc, 1))
249 fs_warn(sdp, "Unable to recover our journal jid %d.\n",
250 sdp->sd_lockstruct.ls_jid);
251 gfs2_glock_dq_wait(&sdp->sd_live_gh);
252 gfs2_holder_reinit(LM_ST_SHARED,
253 LM_FLAG_NOEXP | GL_EXACT | GL_NOPID,
254 &sdp->sd_live_gh);
255 gfs2_glock_nq(&sdp->sd_live_gh);
256 }
257
258 gfs2_glock_queue_put(live_gl); /* drop extra reference we acquired */
259 clear_bit(SDF_WITHDRAW_RECOVERY, &sdp->sd_flags);
260
261 /*
262 * At this point our journal is evicted, so we need to get a new inode
263 * for it. Once done, we need to call gfs2_find_jhead which
264 * calls gfs2_map_journal_extents to map it for us again.
265 *
266 * Note that we don't really want it to look up a FREE block. The
267 * GFS2_BLKST_FREE simply overrides a block check in gfs2_inode_lookup
268 * which would otherwise fail because it requires grabbing an rgrp
269 * glock, which would fail with -EIO because we're withdrawing.
270 */
271 inode = gfs2_inode_lookup(sdp->sd_vfs, DT_UNKNOWN,
272 sdp->sd_jdesc->jd_no_addr, no_formal_ino,
273 GFS2_BLKST_FREE);
274 if (IS_ERR(inode)) {
275 fs_warn(sdp, "Reprocessing of jid %d failed with %ld.\n",
276 sdp->sd_lockstruct.ls_jid, PTR_ERR(inode));
277 goto skip_recovery;
278 }
279 sdp->sd_jdesc->jd_inode = inode;
280 d_mark_dontcache(inode);
281
282 /*
283 * Now wait until recovery is complete.
284 */
285 for (tries = 0; tries < 10; tries++) {
286 ret = check_journal_clean(sdp, sdp->sd_jdesc, false);
287 if (!ret)
288 break;
289 msleep(HZ);
290 fs_warn(sdp, "Waiting for journal recovery jid %d.\n",
291 sdp->sd_lockstruct.ls_jid);
292 }
293skip_recovery:
294 if (!ret)
295 fs_warn(sdp, "Journal recovery complete for jid %d.\n",
296 sdp->sd_lockstruct.ls_jid);
297 else
298 fs_warn(sdp, "Journal recovery skipped for jid %d until next "
299 "mount.\n", sdp->sd_lockstruct.ls_jid);
300 fs_warn(sdp, "Glock dequeues delayed: %lu\n", sdp->sd_glock_dqs_held);
301 sdp->sd_glock_dqs_held = 0;
302 wake_up_bit(&sdp->sd_flags, SDF_WITHDRAW_RECOVERY);
303}
304
305void gfs2_lm(struct gfs2_sbd *sdp, const char *fmt, ...)
306{
307 struct va_format vaf;
308 va_list args;
309
310 if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW &&
311 test_bit(SDF_WITHDRAWN, &sdp->sd_flags))
312 return;
313
314 va_start(args, fmt);
315 vaf.fmt = fmt;
316 vaf.va = &args;
317 fs_err(sdp, "%pV", &vaf);
318 va_end(args);
319}
320
321int gfs2_withdraw(struct gfs2_sbd *sdp)
322{
323 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
324 const struct lm_lockops *lm = ls->ls_ops;
325
326 if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW) {
327 unsigned long old = READ_ONCE(sdp->sd_flags), new;
328
329 do {
330 if (old & BIT(SDF_WITHDRAWN)) {
331 wait_on_bit(&sdp->sd_flags,
332 SDF_WITHDRAW_IN_PROG,
333 TASK_UNINTERRUPTIBLE);
334 return -1;
335 }
336 new = old | BIT(SDF_WITHDRAWN) | BIT(SDF_WITHDRAW_IN_PROG);
337 } while (unlikely(!try_cmpxchg(&sdp->sd_flags, &old, new)));
338
339 fs_err(sdp, "about to withdraw this file system\n");
340 BUG_ON(sdp->sd_args.ar_debug);
341
342 signal_our_withdraw(sdp);
343
344 kobject_uevent(&sdp->sd_kobj, KOBJ_OFFLINE);
345
346 if (!strcmp(sdp->sd_lockstruct.ls_ops->lm_proto_name, "lock_dlm"))
347 wait_for_completion(&sdp->sd_wdack);
348
349 if (lm->lm_unmount) {
350 fs_err(sdp, "telling LM to unmount\n");
351 lm->lm_unmount(sdp);
352 }
353 fs_err(sdp, "File system withdrawn\n");
354 dump_stack();
355 clear_bit(SDF_WITHDRAW_IN_PROG, &sdp->sd_flags);
356 smp_mb__after_atomic();
357 wake_up_bit(&sdp->sd_flags, SDF_WITHDRAW_IN_PROG);
358 }
359
360 if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
361 panic("GFS2: fsid=%s: panic requested\n", sdp->sd_fsname);
362
363 return -1;
364}
365
366/*
367 * gfs2_assert_withdraw_i - Cause the machine to withdraw if @assertion is false
368 */
369
370void gfs2_assert_withdraw_i(struct gfs2_sbd *sdp, char *assertion,
371 const char *function, char *file, unsigned int line,
372 bool delayed)
373{
374 if (gfs2_withdrawing_or_withdrawn(sdp))
375 return;
376
377 fs_err(sdp,
378 "fatal: assertion \"%s\" failed\n"
379 " function = %s, file = %s, line = %u\n",
380 assertion, function, file, line);
381
382 /*
383 * If errors=panic was specified on mount, it won't help to delay the
384 * withdraw.
385 */
386 if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
387 delayed = false;
388
389 if (delayed)
390 gfs2_withdraw_delayed(sdp);
391 else
392 gfs2_withdraw(sdp);
393 dump_stack();
394}
395
396/*
397 * gfs2_assert_warn_i - Print a message to the console if @assertion is false
398 */
399
400void gfs2_assert_warn_i(struct gfs2_sbd *sdp, char *assertion,
401 const char *function, char *file, unsigned int line)
402{
403 if (time_before(jiffies,
404 sdp->sd_last_warning +
405 gfs2_tune_get(sdp, gt_complain_secs) * HZ))
406 return;
407
408 if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW)
409 fs_warn(sdp, "warning: assertion \"%s\" failed at function = %s, file = %s, line = %u\n",
410 assertion, function, file, line);
411
412 if (sdp->sd_args.ar_debug)
413 BUG();
414 else
415 dump_stack();
416
417 if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
418 panic("GFS2: fsid=%s: warning: assertion \"%s\" failed\n"
419 "GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
420 sdp->sd_fsname, assertion,
421 sdp->sd_fsname, function, file, line);
422
423 sdp->sd_last_warning = jiffies;
424}
425
426/*
427 * gfs2_consist_i - Flag a filesystem consistency error and withdraw
428 */
429
430void gfs2_consist_i(struct gfs2_sbd *sdp, const char *function,
431 char *file, unsigned int line)
432{
433 gfs2_lm(sdp,
434 "fatal: filesystem consistency error - function = %s, file = %s, line = %u\n",
435 function, file, line);
436 gfs2_withdraw(sdp);
437}
438
439/*
440 * gfs2_consist_inode_i - Flag an inode consistency error and withdraw
441 */
442
443void gfs2_consist_inode_i(struct gfs2_inode *ip,
444 const char *function, char *file, unsigned int line)
445{
446 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
447
448 gfs2_lm(sdp,
449 "fatal: filesystem consistency error\n"
450 " inode = %llu %llu\n"
451 " function = %s, file = %s, line = %u\n",
452 (unsigned long long)ip->i_no_formal_ino,
453 (unsigned long long)ip->i_no_addr,
454 function, file, line);
455 gfs2_dump_glock(NULL, ip->i_gl, 1);
456 gfs2_withdraw(sdp);
457}
458
459/*
460 * gfs2_consist_rgrpd_i - Flag a RG consistency error and withdraw
461 */
462
463void gfs2_consist_rgrpd_i(struct gfs2_rgrpd *rgd,
464 const char *function, char *file, unsigned int line)
465{
466 struct gfs2_sbd *sdp = rgd->rd_sbd;
467 char fs_id_buf[sizeof(sdp->sd_fsname) + 7];
468
469 sprintf(fs_id_buf, "fsid=%s: ", sdp->sd_fsname);
470 gfs2_rgrp_dump(NULL, rgd, fs_id_buf);
471 gfs2_lm(sdp,
472 "fatal: filesystem consistency error\n"
473 " RG = %llu\n"
474 " function = %s, file = %s, line = %u\n",
475 (unsigned long long)rgd->rd_addr,
476 function, file, line);
477 gfs2_dump_glock(NULL, rgd->rd_gl, 1);
478 gfs2_withdraw(sdp);
479}
480
481/*
482 * gfs2_meta_check_ii - Flag a magic number consistency error and withdraw
483 * Returns: -1 if this call withdrew the machine,
484 * -2 if it was already withdrawn
485 */
486
487int gfs2_meta_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
488 const char *type, const char *function, char *file,
489 unsigned int line)
490{
491 int me;
492
493 gfs2_lm(sdp,
494 "fatal: invalid metadata block\n"
495 " bh = %llu (%s)\n"
496 " function = %s, file = %s, line = %u\n",
497 (unsigned long long)bh->b_blocknr, type,
498 function, file, line);
499 me = gfs2_withdraw(sdp);
500 return (me) ? -1 : -2;
501}
502
503/*
504 * gfs2_metatype_check_ii - Flag a metadata type consistency error and withdraw
505 * Returns: -1 if this call withdrew the machine,
506 * -2 if it was already withdrawn
507 */
508
509int gfs2_metatype_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
510 u16 type, u16 t, const char *function,
511 char *file, unsigned int line)
512{
513 int me;
514
515 gfs2_lm(sdp,
516 "fatal: invalid metadata block\n"
517 " bh = %llu (type: exp=%u, found=%u)\n"
518 " function = %s, file = %s, line = %u\n",
519 (unsigned long long)bh->b_blocknr, type, t,
520 function, file, line);
521 me = gfs2_withdraw(sdp);
522 return (me) ? -1 : -2;
523}
524
525/*
526 * gfs2_io_error_i - Flag an I/O error and withdraw
527 * Returns: -1 if this call withdrew the machine,
528 * 0 if it was already withdrawn
529 */
530
531int gfs2_io_error_i(struct gfs2_sbd *sdp, const char *function, char *file,
532 unsigned int line)
533{
534 gfs2_lm(sdp,
535 "fatal: I/O error\n"
536 " function = %s, file = %s, line = %u\n",
537 function, file, line);
538 return gfs2_withdraw(sdp);
539}
540
541/*
542 * gfs2_io_error_bh_i - Flag a buffer I/O error
543 * @withdraw: withdraw the filesystem
544 */
545
546void gfs2_io_error_bh_i(struct gfs2_sbd *sdp, struct buffer_head *bh,
547 const char *function, char *file, unsigned int line,
548 bool withdraw)
549{
550 if (gfs2_withdrawing_or_withdrawn(sdp))
551 return;
552
553 fs_err(sdp, "fatal: I/O error\n"
554 " block = %llu\n"
555 " function = %s, file = %s, line = %u\n",
556 (unsigned long long)bh->b_blocknr, function, file, line);
557 if (withdraw)
558 gfs2_withdraw(sdp);
559}
560