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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/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 gfs2_freeze_unlock(&freeze_gh);
168 }
169
170 if (sdp->sd_lockstruct.ls_ops->lm_lock == NULL) { /* lock_nolock */
171 if (!ret)
172 ret = -EIO;
173 clear_bit(SDF_WITHDRAW_RECOVERY, &sdp->sd_flags);
174 goto skip_recovery;
175 }
176 /*
177 * Drop the glock for our journal so another node can recover it.
178 */
179 if (gfs2_holder_initialized(&sdp->sd_journal_gh)) {
180 gfs2_glock_dq_wait(&sdp->sd_journal_gh);
181 gfs2_holder_uninit(&sdp->sd_journal_gh);
182 }
183 sdp->sd_jinode_gh.gh_flags |= GL_NOCACHE;
184 gfs2_glock_dq(&sdp->sd_jinode_gh);
185 if (test_bit(SDF_FS_FROZEN, &sdp->sd_flags)) {
186 /* Make sure gfs2_unfreeze works if partially-frozen */
187 flush_work(&sdp->sd_freeze_work);
188 atomic_set(&sdp->sd_freeze_state, SFS_FROZEN);
189 thaw_super(sdp->sd_vfs);
190 } else {
191 wait_on_bit(&i_gl->gl_flags, GLF_DEMOTE,
192 TASK_UNINTERRUPTIBLE);
193 }
194
195 /*
196 * holder_uninit to force glock_put, to force dlm to let go
197 */
198 gfs2_holder_uninit(&sdp->sd_jinode_gh);
199
200 /*
201 * Note: We need to be careful here:
202 * Our iput of jd_inode will evict it. The evict will dequeue its
203 * glock, but the glock dq will wait for the withdraw unless we have
204 * exception code in glock_dq.
205 */
206 iput(inode);
207 /*
208 * Wait until the journal inode's glock is freed. This allows try locks
209 * on other nodes to be successful, otherwise we remain the owner of
210 * the glock as far as dlm is concerned.
211 */
212 if (i_gl->gl_ops->go_free) {
213 set_bit(GLF_FREEING, &i_gl->gl_flags);
214 wait_on_bit(&i_gl->gl_flags, GLF_FREEING, TASK_UNINTERRUPTIBLE);
215 }
216
217 /*
218 * Dequeue the "live" glock, but keep a reference so it's never freed.
219 */
220 gfs2_glock_hold(live_gl);
221 gfs2_glock_dq_wait(&sdp->sd_live_gh);
222 /*
223 * We enqueue the "live" glock in EX so that all other nodes
224 * get a demote request and act on it. We don't really want the
225 * lock in EX, so we send a "try" lock with 1CB to produce a callback.
226 */
227 fs_warn(sdp, "Requesting recovery of jid %d.\n",
228 sdp->sd_lockstruct.ls_jid);
229 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | LM_FLAG_NOEXP,
230 &sdp->sd_live_gh);
231 msleep(GL_GLOCK_MAX_HOLD);
232 /*
233 * This will likely fail in a cluster, but succeed standalone:
234 */
235 ret = gfs2_glock_nq(&sdp->sd_live_gh);
236
237 /*
238 * If we actually got the "live" lock in EX mode, there are no other
239 * nodes available to replay our journal. So we try to replay it
240 * ourselves. We hold the "live" glock to prevent other mounters
241 * during recovery, then just dequeue it and reacquire it in our
242 * normal SH mode. Just in case the problem that caused us to
243 * withdraw prevents us from recovering our journal (e.g. io errors
244 * and such) we still check if the journal is clean before proceeding
245 * but we may wait forever until another mounter does the recovery.
246 */
247 if (ret == 0) {
248 fs_warn(sdp, "No other mounters found. Trying to recover our "
249 "own journal jid %d.\n", sdp->sd_lockstruct.ls_jid);
250 if (gfs2_recover_journal(sdp->sd_jdesc, 1))
251 fs_warn(sdp, "Unable to recover our journal jid %d.\n",
252 sdp->sd_lockstruct.ls_jid);
253 gfs2_glock_dq_wait(&sdp->sd_live_gh);
254 gfs2_holder_reinit(LM_ST_SHARED, LM_FLAG_NOEXP | GL_EXACT,
255 &sdp->sd_live_gh);
256 gfs2_glock_nq(&sdp->sd_live_gh);
257 }
258
259 gfs2_glock_queue_put(live_gl); /* drop extra reference we acquired */
260 clear_bit(SDF_WITHDRAW_RECOVERY, &sdp->sd_flags);
261
262 /*
263 * At this point our journal is evicted, so we need to get a new inode
264 * for it. Once done, we need to call gfs2_find_jhead which
265 * calls gfs2_map_journal_extents to map it for us again.
266 *
267 * Note that we don't really want it to look up a FREE block. The
268 * GFS2_BLKST_FREE simply overrides a block check in gfs2_inode_lookup
269 * which would otherwise fail because it requires grabbing an rgrp
270 * glock, which would fail with -EIO because we're withdrawing.
271 */
272 inode = gfs2_inode_lookup(sdp->sd_vfs, DT_UNKNOWN,
273 sdp->sd_jdesc->jd_no_addr, no_formal_ino,
274 GFS2_BLKST_FREE);
275 if (IS_ERR(inode)) {
276 fs_warn(sdp, "Reprocessing of jid %d failed with %ld.\n",
277 sdp->sd_lockstruct.ls_jid, PTR_ERR(inode));
278 goto skip_recovery;
279 }
280 sdp->sd_jdesc->jd_inode = 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 %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 test_and_set_bit(SDF_WITHDRAWN, &sdp->sd_flags)) {
328 if (!test_bit(SDF_WITHDRAW_IN_PROG, &sdp->sd_flags))
329 return -1;
330
331 wait_on_bit(&sdp->sd_flags, SDF_WITHDRAW_IN_PROG,
332 TASK_UNINTERRUPTIBLE);
333 return -1;
334 }
335
336 set_bit(SDF_WITHDRAW_IN_PROG, &sdp->sd_flags);
337
338 if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW) {
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 set_bit(SDF_SKIP_DLM_UNLOCK, &sdp->sd_flags);
354 fs_err(sdp, "File system withdrawn\n");
355 dump_stack();
356 clear_bit(SDF_WITHDRAW_IN_PROG, &sdp->sd_flags);
357 smp_mb__after_atomic();
358 wake_up_bit(&sdp->sd_flags, SDF_WITHDRAW_IN_PROG);
359 }
360
361 if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
362 panic("GFS2: fsid=%s: panic requested\n", sdp->sd_fsname);
363
364 return -1;
365}
366
367/*
368 * gfs2_assert_withdraw_i - Cause the machine to withdraw if @assertion is false
369 */
370
371void gfs2_assert_withdraw_i(struct gfs2_sbd *sdp, char *assertion,
372 const char *function, char *file, unsigned int line,
373 bool delayed)
374{
375 if (gfs2_withdrawn(sdp))
376 return;
377
378 fs_err(sdp,
379 "fatal: assertion \"%s\" failed\n"
380 " function = %s, file = %s, line = %u\n",
381 assertion, function, file, line);
382
383 /*
384 * If errors=panic was specified on mount, it won't help to delay the
385 * withdraw.
386 */
387 if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
388 delayed = false;
389
390 if (delayed)
391 gfs2_withdraw_delayed(sdp);
392 else
393 gfs2_withdraw(sdp);
394 dump_stack();
395}
396
397/*
398 * gfs2_assert_warn_i - Print a message to the console if @assertion is false
399 */
400
401void gfs2_assert_warn_i(struct gfs2_sbd *sdp, char *assertion,
402 const char *function, char *file, unsigned int line)
403{
404 if (time_before(jiffies,
405 sdp->sd_last_warning +
406 gfs2_tune_get(sdp, gt_complain_secs) * HZ))
407 return;
408
409 if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW)
410 fs_warn(sdp, "warning: assertion \"%s\" failed at function = %s, file = %s, line = %u\n",
411 assertion, function, file, line);
412
413 if (sdp->sd_args.ar_debug)
414 BUG();
415 else
416 dump_stack();
417
418 if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
419 panic("GFS2: fsid=%s: warning: assertion \"%s\" failed\n"
420 "GFS2: fsid=%s: function = %s, file = %s, line = %u\n",
421 sdp->sd_fsname, assertion,
422 sdp->sd_fsname, function, file, line);
423
424 sdp->sd_last_warning = jiffies;
425}
426
427/*
428 * gfs2_consist_i - Flag a filesystem consistency error and withdraw
429 */
430
431void gfs2_consist_i(struct gfs2_sbd *sdp, const char *function,
432 char *file, unsigned int line)
433{
434 gfs2_lm(sdp,
435 "fatal: filesystem consistency error - function = %s, file = %s, line = %u\n",
436 function, file, line);
437 gfs2_withdraw(sdp);
438}
439
440/*
441 * gfs2_consist_inode_i - Flag an inode consistency error and withdraw
442 */
443
444void gfs2_consist_inode_i(struct gfs2_inode *ip,
445 const char *function, char *file, unsigned int line)
446{
447 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
448
449 gfs2_lm(sdp,
450 "fatal: filesystem consistency error\n"
451 " inode = %llu %llu\n"
452 " function = %s, file = %s, line = %u\n",
453 (unsigned long long)ip->i_no_formal_ino,
454 (unsigned long long)ip->i_no_addr,
455 function, file, line);
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_withdraw(sdp);
478}
479
480/*
481 * gfs2_meta_check_ii - Flag a magic number consistency error and withdraw
482 * Returns: -1 if this call withdrew the machine,
483 * -2 if it was already withdrawn
484 */
485
486int gfs2_meta_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
487 const char *type, const char *function, char *file,
488 unsigned int line)
489{
490 int me;
491
492 gfs2_lm(sdp,
493 "fatal: invalid metadata block\n"
494 " bh = %llu (%s)\n"
495 " function = %s, file = %s, line = %u\n",
496 (unsigned long long)bh->b_blocknr, type,
497 function, file, line);
498 me = gfs2_withdraw(sdp);
499 return (me) ? -1 : -2;
500}
501
502/*
503 * gfs2_metatype_check_ii - Flag a metadata type consistency error and withdraw
504 * Returns: -1 if this call withdrew the machine,
505 * -2 if it was already withdrawn
506 */
507
508int gfs2_metatype_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
509 u16 type, u16 t, const char *function,
510 char *file, unsigned int line)
511{
512 int me;
513
514 gfs2_lm(sdp,
515 "fatal: invalid metadata block\n"
516 " bh = %llu (type: exp=%u, found=%u)\n"
517 " function = %s, file = %s, line = %u\n",
518 (unsigned long long)bh->b_blocknr, type, t,
519 function, file, line);
520 me = gfs2_withdraw(sdp);
521 return (me) ? -1 : -2;
522}
523
524/*
525 * gfs2_io_error_i - Flag an I/O error and withdraw
526 * Returns: -1 if this call withdrew the machine,
527 * 0 if it was already withdrawn
528 */
529
530int gfs2_io_error_i(struct gfs2_sbd *sdp, const char *function, char *file,
531 unsigned int line)
532{
533 gfs2_lm(sdp,
534 "fatal: I/O error\n"
535 " function = %s, file = %s, line = %u\n",
536 function, file, line);
537 return gfs2_withdraw(sdp);
538}
539
540/*
541 * gfs2_io_error_bh_i - Flag a buffer I/O error
542 * @withdraw: withdraw the filesystem
543 */
544
545void gfs2_io_error_bh_i(struct gfs2_sbd *sdp, struct buffer_head *bh,
546 const char *function, char *file, unsigned int line,
547 bool withdraw)
548{
549 if (gfs2_withdrawn(sdp))
550 return;
551
552 fs_err(sdp, "fatal: I/O error\n"
553 " block = %llu\n"
554 " function = %s, file = %s, line = %u\n",
555 (unsigned long long)bh->b_blocknr, function, file, line);
556 if (withdraw)
557 gfs2_withdraw(sdp);
558}
559