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authorDavid Teigland <teigland@redhat.com>2006-01-16 11:50:04 -0500
committerSteven Whitehouse <swhiteho@redhat.com>2006-01-16 11:50:04 -0500
commitb3b94faa5fe5968827ba0640ee9fba4b3e7f736e (patch)
tree70bd6068b050d2c46e338484f8b03fae4365c6c3 /fs/gfs2/recovery.c
parentf7825dcf8c7301cfd3724eb40c5b443cc85ab7b8 (diff)
[GFS2] The core of GFS2
This patch contains all the core files for GFS2. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/recovery.c')
-rw-r--r--fs/gfs2/recovery.c570
1 files changed, 570 insertions, 0 deletions
diff --git a/fs/gfs2/recovery.c b/fs/gfs2/recovery.c
new file mode 100644
index 000000000000..15cd26fbcff9
--- /dev/null
+++ b/fs/gfs2/recovery.c
@@ -0,0 +1,570 @@
1/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License v.2.
8 */
9
10#include <linux/sched.h>
11#include <linux/slab.h>
12#include <linux/spinlock.h>
13#include <linux/completion.h>
14#include <linux/buffer_head.h>
15#include <asm/semaphore.h>
16
17#include "gfs2.h"
18#include "bmap.h"
19#include "glock.h"
20#include "glops.h"
21#include "lm.h"
22#include "lops.h"
23#include "meta_io.h"
24#include "recovery.h"
25#include "super.h"
26
27int gfs2_replay_read_block(struct gfs2_jdesc *jd, unsigned int blk,
28 struct buffer_head **bh)
29{
30 struct gfs2_glock *gl = jd->jd_inode->i_gl;
31 int new = 0;
32 uint64_t dblock;
33 uint32_t extlen;
34 int error;
35
36 error = gfs2_block_map(jd->jd_inode, blk, &new, &dblock, &extlen);
37 if (error)
38 return error;
39 if (!dblock) {
40 gfs2_consist_inode(jd->jd_inode);
41 return -EIO;
42 }
43
44 gfs2_meta_ra(gl, dblock, extlen);
45 error = gfs2_meta_read(gl, dblock, DIO_START | DIO_WAIT, bh);
46
47 return error;
48}
49
50int gfs2_revoke_add(struct gfs2_sbd *sdp, uint64_t blkno, unsigned int where)
51{
52 struct list_head *head = &sdp->sd_revoke_list;
53 struct gfs2_revoke_replay *rr;
54 int found = 0;
55
56 list_for_each_entry(rr, head, rr_list) {
57 if (rr->rr_blkno == blkno) {
58 found = 1;
59 break;
60 }
61 }
62
63 if (found) {
64 rr->rr_where = where;
65 return 0;
66 }
67
68 rr = kmalloc(sizeof(struct gfs2_revoke_replay), GFP_KERNEL);
69 if (!rr)
70 return -ENOMEM;
71
72 rr->rr_blkno = blkno;
73 rr->rr_where = where;
74 list_add(&rr->rr_list, head);
75
76 return 1;
77}
78
79int gfs2_revoke_check(struct gfs2_sbd *sdp, uint64_t blkno, unsigned int where)
80{
81 struct gfs2_revoke_replay *rr;
82 int wrap, a, b, revoke;
83 int found = 0;
84
85 list_for_each_entry(rr, &sdp->sd_revoke_list, rr_list) {
86 if (rr->rr_blkno == blkno) {
87 found = 1;
88 break;
89 }
90 }
91
92 if (!found)
93 return 0;
94
95 wrap = (rr->rr_where < sdp->sd_replay_tail);
96 a = (sdp->sd_replay_tail < where);
97 b = (where < rr->rr_where);
98 revoke = (wrap) ? (a || b) : (a && b);
99
100 return revoke;
101}
102
103void gfs2_revoke_clean(struct gfs2_sbd *sdp)
104{
105 struct list_head *head = &sdp->sd_revoke_list;
106 struct gfs2_revoke_replay *rr;
107
108 while (!list_empty(head)) {
109 rr = list_entry(head->next, struct gfs2_revoke_replay, rr_list);
110 list_del(&rr->rr_list);
111 kfree(rr);
112 }
113}
114
115/**
116 * get_log_header - read the log header for a given segment
117 * @jd: the journal
118 * @blk: the block to look at
119 * @lh: the log header to return
120 *
121 * Read the log header for a given segement in a given journal. Do a few
122 * sanity checks on it.
123 *
124 * Returns: 0 on success,
125 * 1 if the header was invalid or incomplete,
126 * errno on error
127 */
128
129static int get_log_header(struct gfs2_jdesc *jd, unsigned int blk,
130 struct gfs2_log_header *head)
131{
132 struct buffer_head *bh;
133 struct gfs2_log_header lh;
134 uint32_t hash;
135 int error;
136
137 error = gfs2_replay_read_block(jd, blk, &bh);
138 if (error)
139 return error;
140
141 memcpy(&lh, bh->b_data, sizeof(struct gfs2_log_header));
142 lh.lh_hash = 0;
143 hash = gfs2_disk_hash((char *)&lh, sizeof(struct gfs2_log_header));
144 gfs2_log_header_in(&lh, bh->b_data);
145
146 brelse(bh);
147
148 if (lh.lh_header.mh_magic != GFS2_MAGIC ||
149 lh.lh_header.mh_type != GFS2_METATYPE_LH ||
150 lh.lh_blkno != blk ||
151 lh.lh_hash != hash)
152 return 1;
153
154 *head = lh;
155
156 return 0;
157}
158
159/**
160 * find_good_lh - find a good log header
161 * @jd: the journal
162 * @blk: the segment to start searching from
163 * @lh: the log header to fill in
164 * @forward: if true search forward in the log, else search backward
165 *
166 * Call get_log_header() to get a log header for a segment, but if the
167 * segment is bad, either scan forward or backward until we find a good one.
168 *
169 * Returns: errno
170 */
171
172static int find_good_lh(struct gfs2_jdesc *jd, unsigned int *blk,
173 struct gfs2_log_header *head)
174{
175 unsigned int orig_blk = *blk;
176 int error;
177
178 for (;;) {
179 error = get_log_header(jd, *blk, head);
180 if (error <= 0)
181 return error;
182
183 if (++*blk == jd->jd_blocks)
184 *blk = 0;
185
186 if (*blk == orig_blk) {
187 gfs2_consist_inode(jd->jd_inode);
188 return -EIO;
189 }
190 }
191}
192
193/**
194 * jhead_scan - make sure we've found the head of the log
195 * @jd: the journal
196 * @head: this is filled in with the log descriptor of the head
197 *
198 * At this point, seg and lh should be either the head of the log or just
199 * before. Scan forward until we find the head.
200 *
201 * Returns: errno
202 */
203
204static int jhead_scan(struct gfs2_jdesc *jd, struct gfs2_log_header *head)
205{
206 unsigned int blk = head->lh_blkno;
207 struct gfs2_log_header lh;
208 int error;
209
210 for (;;) {
211 if (++blk == jd->jd_blocks)
212 blk = 0;
213
214 error = get_log_header(jd, blk, &lh);
215 if (error < 0)
216 return error;
217 if (error == 1)
218 continue;
219
220 if (lh.lh_sequence == head->lh_sequence) {
221 gfs2_consist_inode(jd->jd_inode);
222 return -EIO;
223 }
224 if (lh.lh_sequence < head->lh_sequence)
225 break;
226
227 *head = lh;
228 }
229
230 return 0;
231}
232
233/**
234 * gfs2_find_jhead - find the head of a log
235 * @jd: the journal
236 * @head: the log descriptor for the head of the log is returned here
237 *
238 * Do a binary search of a journal and find the valid log entry with the
239 * highest sequence number. (i.e. the log head)
240 *
241 * Returns: errno
242 */
243
244int gfs2_find_jhead(struct gfs2_jdesc *jd, struct gfs2_log_header *head)
245{
246 struct gfs2_log_header lh_1, lh_m;
247 uint32_t blk_1, blk_2, blk_m;
248 int error;
249
250 blk_1 = 0;
251 blk_2 = jd->jd_blocks - 1;
252
253 for (;;) {
254 blk_m = (blk_1 + blk_2) / 2;
255
256 error = find_good_lh(jd, &blk_1, &lh_1);
257 if (error)
258 return error;
259
260 error = find_good_lh(jd, &blk_m, &lh_m);
261 if (error)
262 return error;
263
264 if (blk_1 == blk_m || blk_m == blk_2)
265 break;
266
267 if (lh_1.lh_sequence <= lh_m.lh_sequence)
268 blk_1 = blk_m;
269 else
270 blk_2 = blk_m;
271 }
272
273 error = jhead_scan(jd, &lh_1);
274 if (error)
275 return error;
276
277 *head = lh_1;
278
279 return error;
280}
281
282/**
283 * foreach_descriptor - go through the active part of the log
284 * @jd: the journal
285 * @start: the first log header in the active region
286 * @end: the last log header (don't process the contents of this entry))
287 *
288 * Call a given function once for every log descriptor in the active
289 * portion of the log.
290 *
291 * Returns: errno
292 */
293
294static int foreach_descriptor(struct gfs2_jdesc *jd, unsigned int start,
295 unsigned int end, int pass)
296{
297 struct gfs2_sbd *sdp = jd->jd_inode->i_sbd;
298 struct buffer_head *bh;
299 struct gfs2_log_descriptor *ld;
300 int error = 0;
301 u32 length;
302 __be64 *ptr;
303 unsigned int offset = sizeof(struct gfs2_log_descriptor);
304 offset += (sizeof(__be64)-1);
305 offset &= ~(sizeof(__be64)-1);
306
307 while (start != end) {
308 error = gfs2_replay_read_block(jd, start, &bh);
309 if (error)
310 return error;
311 if (gfs2_meta_check(sdp, bh)) {
312 brelse(bh);
313 return -EIO;
314 }
315 ld = (struct gfs2_log_descriptor *)bh->b_data;
316 length = be32_to_cpu(ld->ld_length);
317
318 if (be16_to_cpu(ld->ld_header.mh_type) == GFS2_METATYPE_LH) {
319 struct gfs2_log_header lh;
320 error = get_log_header(jd, start, &lh);
321 if (!error) {
322 gfs2_replay_incr_blk(sdp, &start);
323 continue;
324 }
325 if (error == 1) {
326 gfs2_consist_inode(jd->jd_inode);
327 error = -EIO;
328 }
329 brelse(bh);
330 return error;
331 } else if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_LD)) {
332 brelse(bh);
333 return -EIO;
334 }
335 ptr = (__be64 *)(bh->b_data + offset);
336 error = lops_scan_elements(jd, start, ld, ptr, pass);
337 if (error) {
338 brelse(bh);
339 return error;
340 }
341
342 while (length--)
343 gfs2_replay_incr_blk(sdp, &start);
344
345 brelse(bh);
346 }
347
348 return 0;
349}
350
351/**
352 * clean_journal - mark a dirty journal as being clean
353 * @sdp: the filesystem
354 * @jd: the journal
355 * @gl: the journal's glock
356 * @head: the head journal to start from
357 *
358 * Returns: errno
359 */
360
361static int clean_journal(struct gfs2_jdesc *jd, struct gfs2_log_header *head)
362{
363 struct gfs2_inode *ip = jd->jd_inode;
364 struct gfs2_sbd *sdp = ip->i_sbd;
365 unsigned int lblock;
366 int new = 0;
367 uint64_t dblock;
368 struct gfs2_log_header *lh;
369 uint32_t hash;
370 struct buffer_head *bh;
371 int error;
372
373 lblock = head->lh_blkno;
374 gfs2_replay_incr_blk(sdp, &lblock);
375 error = gfs2_block_map(ip, lblock, &new, &dblock, NULL);
376 if (error)
377 return error;
378 if (!dblock) {
379 gfs2_consist_inode(ip);
380 return -EIO;
381 }
382
383 bh = sb_getblk(sdp->sd_vfs, dblock);
384 lock_buffer(bh);
385 memset(bh->b_data, 0, bh->b_size);
386 set_buffer_uptodate(bh);
387 clear_buffer_dirty(bh);
388 unlock_buffer(bh);
389
390 lh = (struct gfs2_log_header *)bh->b_data;
391 memset(lh, 0, sizeof(struct gfs2_log_header));
392 lh->lh_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
393 lh->lh_header.mh_type = cpu_to_be16(GFS2_METATYPE_LH);
394 lh->lh_header.mh_format = cpu_to_be16(GFS2_FORMAT_LH);
395 lh->lh_sequence = cpu_to_be64(head->lh_sequence + 1);
396 lh->lh_flags = cpu_to_be32(GFS2_LOG_HEAD_UNMOUNT);
397 lh->lh_blkno = cpu_to_be32(lblock);
398 hash = gfs2_disk_hash((const char *)lh, sizeof(struct gfs2_log_header));
399 lh->lh_hash = cpu_to_be32(hash);
400
401 set_buffer_dirty(bh);
402 if (sync_dirty_buffer(bh))
403 gfs2_io_error_bh(sdp, bh);
404 brelse(bh);
405
406 return error;
407}
408
409/**
410 * gfs2_recover_journal - recovery a given journal
411 * @jd: the struct gfs2_jdesc describing the journal
412 * @wait: Don't return until the journal is clean (or an error is encountered)
413 *
414 * Acquire the journal's lock, check to see if the journal is clean, and
415 * do recovery if necessary.
416 *
417 * Returns: errno
418 */
419
420int gfs2_recover_journal(struct gfs2_jdesc *jd, int wait)
421{
422 struct gfs2_sbd *sdp = jd->jd_inode->i_sbd;
423 struct gfs2_log_header head;
424 struct gfs2_holder j_gh, ji_gh, t_gh;
425 unsigned long t;
426 int ro = 0;
427 unsigned int pass;
428 int error;
429
430 fs_info(sdp, "jid=%u: Trying to acquire journal lock...\n", jd->jd_jid);
431
432 /* Aquire the journal lock so we can do recovery */
433
434 error = gfs2_glock_nq_num(sdp,
435 jd->jd_jid, &gfs2_journal_glops,
436 LM_ST_EXCLUSIVE,
437 LM_FLAG_NOEXP |
438 ((wait) ? 0 : LM_FLAG_TRY) |
439 GL_NOCACHE, &j_gh);
440 switch (error) {
441 case 0:
442 break;
443
444 case GLR_TRYFAILED:
445 fs_info(sdp, "jid=%u: Busy\n", jd->jd_jid);
446 error = 0;
447
448 default:
449 goto fail;
450 };
451
452 error = gfs2_glock_nq_init(jd->jd_inode->i_gl, LM_ST_SHARED,
453 LM_FLAG_NOEXP, &ji_gh);
454 if (error)
455 goto fail_gunlock_j;
456
457 fs_info(sdp, "jid=%u: Looking at journal...\n", jd->jd_jid);
458
459 error = gfs2_jdesc_check(jd);
460 if (error)
461 goto fail_gunlock_ji;
462
463 error = gfs2_find_jhead(jd, &head);
464 if (error)
465 goto fail_gunlock_ji;
466
467 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
468 fs_info(sdp, "jid=%u: Acquiring the transaction lock...\n",
469 jd->jd_jid);
470
471 t = jiffies;
472
473 /* Acquire a shared hold on the transaction lock */
474
475 error = gfs2_glock_nq_init(sdp->sd_trans_gl,
476 LM_ST_SHARED,
477 LM_FLAG_NOEXP |
478 LM_FLAG_PRIORITY |
479 GL_NEVER_RECURSE |
480 GL_NOCANCEL |
481 GL_NOCACHE,
482 &t_gh);
483 if (error)
484 goto fail_gunlock_ji;
485
486 if (test_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags)) {
487 if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
488 ro = 1;
489 } else {
490 if (sdp->sd_vfs->s_flags & MS_RDONLY)
491 ro = 1;
492 }
493
494 if (ro) {
495 fs_warn(sdp, "jid=%u: Can't replay: read-only FS\n",
496 jd->jd_jid);
497 error = -EROFS;
498 goto fail_gunlock_tr;
499 }
500
501 fs_info(sdp, "jid=%u: Replaying journal...\n", jd->jd_jid);
502
503 for (pass = 0; pass < 2; pass++) {
504 lops_before_scan(jd, &head, pass);
505 error = foreach_descriptor(jd, head.lh_tail,
506 head.lh_blkno, pass);
507 lops_after_scan(jd, error, pass);
508 if (error)
509 goto fail_gunlock_tr;
510 }
511
512 error = clean_journal(jd, &head);
513 if (error)
514 goto fail_gunlock_tr;
515
516 gfs2_glock_dq_uninit(&t_gh);
517
518 t = DIV_RU(jiffies - t, HZ);
519
520 fs_info(sdp, "jid=%u: Journal replayed in %lus\n",
521 jd->jd_jid, t);
522 }
523
524 gfs2_glock_dq_uninit(&ji_gh);
525
526 gfs2_lm_recovery_done(sdp, jd->jd_jid, LM_RD_SUCCESS);
527
528 gfs2_glock_dq_uninit(&j_gh);
529
530 fs_info(sdp, "jid=%u: Done\n", jd->jd_jid);
531
532 return 0;
533
534 fail_gunlock_tr:
535 gfs2_glock_dq_uninit(&t_gh);
536
537 fail_gunlock_ji:
538 gfs2_glock_dq_uninit(&ji_gh);
539
540 fail_gunlock_j:
541 gfs2_glock_dq_uninit(&j_gh);
542
543 fs_info(sdp, "jid=%u: %s\n", jd->jd_jid, (error) ? "Failed" : "Done");
544
545 fail:
546 gfs2_lm_recovery_done(sdp, jd->jd_jid, LM_RD_GAVEUP);
547
548 return error;
549}
550
551/**
552 * gfs2_check_journals - Recover any dirty journals
553 * @sdp: the filesystem
554 *
555 */
556
557void gfs2_check_journals(struct gfs2_sbd *sdp)
558{
559 struct gfs2_jdesc *jd;
560
561 for (;;) {
562 jd = gfs2_jdesc_find_dirty(sdp);
563 if (!jd)
564 break;
565
566 if (jd != sdp->sd_jdesc)
567 gfs2_recover_journal(jd, NO_WAIT);
568 }
569}
570