This source file includes following definitions.
- gfs2_replay_read_block
- gfs2_revoke_add
- gfs2_revoke_check
- gfs2_revoke_clean
- __get_log_header
- get_log_header
- foreach_descriptor
- clean_journal
- gfs2_recovery_done
- gfs2_recover_func
- gfs2_recover_journal
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7 #include <linux/module.h>
8 #include <linux/slab.h>
9 #include <linux/spinlock.h>
10 #include <linux/completion.h>
11 #include <linux/buffer_head.h>
12 #include <linux/gfs2_ondisk.h>
13 #include <linux/crc32.h>
14 #include <linux/crc32c.h>
15 #include <linux/ktime.h>
16
17 #include "gfs2.h"
18 #include "incore.h"
19 #include "bmap.h"
20 #include "glock.h"
21 #include "glops.h"
22 #include "log.h"
23 #include "lops.h"
24 #include "meta_io.h"
25 #include "recovery.h"
26 #include "super.h"
27 #include "util.h"
28 #include "dir.h"
29
30 struct workqueue_struct *gfs_recovery_wq;
31
32 int gfs2_replay_read_block(struct gfs2_jdesc *jd, unsigned int blk,
33 struct buffer_head **bh)
34 {
35 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
36 struct gfs2_glock *gl = ip->i_gl;
37 int new = 0;
38 u64 dblock;
39 u32 extlen;
40 int error;
41
42 error = gfs2_extent_map(&ip->i_inode, blk, &new, &dblock, &extlen);
43 if (error)
44 return error;
45 if (!dblock) {
46 gfs2_consist_inode(ip);
47 return -EIO;
48 }
49
50 *bh = gfs2_meta_ra(gl, dblock, extlen);
51
52 return error;
53 }
54
55 int gfs2_revoke_add(struct gfs2_jdesc *jd, u64 blkno, unsigned int where)
56 {
57 struct list_head *head = &jd->jd_revoke_list;
58 struct gfs2_revoke_replay *rr;
59 int found = 0;
60
61 list_for_each_entry(rr, head, rr_list) {
62 if (rr->rr_blkno == blkno) {
63 found = 1;
64 break;
65 }
66 }
67
68 if (found) {
69 rr->rr_where = where;
70 return 0;
71 }
72
73 rr = kmalloc(sizeof(struct gfs2_revoke_replay), GFP_NOFS);
74 if (!rr)
75 return -ENOMEM;
76
77 rr->rr_blkno = blkno;
78 rr->rr_where = where;
79 list_add(&rr->rr_list, head);
80
81 return 1;
82 }
83
84 int gfs2_revoke_check(struct gfs2_jdesc *jd, u64 blkno, unsigned int where)
85 {
86 struct gfs2_revoke_replay *rr;
87 int wrap, a, b, revoke;
88 int found = 0;
89
90 list_for_each_entry(rr, &jd->jd_revoke_list, rr_list) {
91 if (rr->rr_blkno == blkno) {
92 found = 1;
93 break;
94 }
95 }
96
97 if (!found)
98 return 0;
99
100 wrap = (rr->rr_where < jd->jd_replay_tail);
101 a = (jd->jd_replay_tail < where);
102 b = (where < rr->rr_where);
103 revoke = (wrap) ? (a || b) : (a && b);
104
105 return revoke;
106 }
107
108 void gfs2_revoke_clean(struct gfs2_jdesc *jd)
109 {
110 struct list_head *head = &jd->jd_revoke_list;
111 struct gfs2_revoke_replay *rr;
112
113 while (!list_empty(head)) {
114 rr = list_entry(head->next, struct gfs2_revoke_replay, rr_list);
115 list_del(&rr->rr_list);
116 kfree(rr);
117 }
118 }
119
120 int __get_log_header(struct gfs2_sbd *sdp, const struct gfs2_log_header *lh,
121 unsigned int blkno, struct gfs2_log_header_host *head)
122 {
123 u32 hash, crc;
124
125 if (lh->lh_header.mh_magic != cpu_to_be32(GFS2_MAGIC) ||
126 lh->lh_header.mh_type != cpu_to_be32(GFS2_METATYPE_LH) ||
127 (blkno && be32_to_cpu(lh->lh_blkno) != blkno))
128 return 1;
129
130 hash = crc32(~0, lh, LH_V1_SIZE - 4);
131 hash = ~crc32_le_shift(hash, 4);
132
133 if (be32_to_cpu(lh->lh_hash) != hash)
134 return 1;
135
136 crc = crc32c(~0, (void *)lh + LH_V1_SIZE + 4,
137 sdp->sd_sb.sb_bsize - LH_V1_SIZE - 4);
138
139 if ((lh->lh_crc != 0 && be32_to_cpu(lh->lh_crc) != crc))
140 return 1;
141
142 head->lh_sequence = be64_to_cpu(lh->lh_sequence);
143 head->lh_flags = be32_to_cpu(lh->lh_flags);
144 head->lh_tail = be32_to_cpu(lh->lh_tail);
145 head->lh_blkno = be32_to_cpu(lh->lh_blkno);
146
147 return 0;
148 }
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162
163 static int get_log_header(struct gfs2_jdesc *jd, unsigned int blk,
164 struct gfs2_log_header_host *head)
165 {
166 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
167 struct buffer_head *bh;
168 int error;
169
170 error = gfs2_replay_read_block(jd, blk, &bh);
171 if (error)
172 return error;
173
174 error = __get_log_header(sdp, (const struct gfs2_log_header *)bh->b_data,
175 blk, head);
176 brelse(bh);
177
178 return error;
179 }
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192
193 static int foreach_descriptor(struct gfs2_jdesc *jd, u32 start,
194 unsigned int end, int pass)
195 {
196 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
197 struct buffer_head *bh;
198 struct gfs2_log_descriptor *ld;
199 int error = 0;
200 u32 length;
201 __be64 *ptr;
202 unsigned int offset = sizeof(struct gfs2_log_descriptor);
203 offset += sizeof(__be64) - 1;
204 offset &= ~(sizeof(__be64) - 1);
205
206 while (start != end) {
207 error = gfs2_replay_read_block(jd, start, &bh);
208 if (error)
209 return error;
210 if (gfs2_meta_check(sdp, bh)) {
211 brelse(bh);
212 return -EIO;
213 }
214 ld = (struct gfs2_log_descriptor *)bh->b_data;
215 length = be32_to_cpu(ld->ld_length);
216
217 if (be32_to_cpu(ld->ld_header.mh_type) == GFS2_METATYPE_LH) {
218 struct gfs2_log_header_host lh;
219 error = get_log_header(jd, start, &lh);
220 if (!error) {
221 gfs2_replay_incr_blk(jd, &start);
222 brelse(bh);
223 continue;
224 }
225 if (error == 1) {
226 gfs2_consist_inode(GFS2_I(jd->jd_inode));
227 error = -EIO;
228 }
229 brelse(bh);
230 return error;
231 } else if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_LD)) {
232 brelse(bh);
233 return -EIO;
234 }
235 ptr = (__be64 *)(bh->b_data + offset);
236 error = lops_scan_elements(jd, start, ld, ptr, pass);
237 if (error) {
238 brelse(bh);
239 return error;
240 }
241
242 while (length--)
243 gfs2_replay_incr_blk(jd, &start);
244
245 brelse(bh);
246 }
247
248 return 0;
249 }
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258
259 static void clean_journal(struct gfs2_jdesc *jd,
260 struct gfs2_log_header_host *head)
261 {
262 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
263 u32 lblock = head->lh_blkno;
264
265 gfs2_replay_incr_blk(jd, &lblock);
266 if (jd->jd_jid == sdp->sd_lockstruct.ls_jid)
267 sdp->sd_log_flush_head = lblock;
268 gfs2_write_log_header(sdp, jd, head->lh_sequence + 1, 0, lblock,
269 GFS2_LOG_HEAD_UNMOUNT | GFS2_LOG_HEAD_RECOVERY,
270 REQ_PREFLUSH | REQ_FUA | REQ_META | REQ_SYNC);
271 }
272
273
274 static void gfs2_recovery_done(struct gfs2_sbd *sdp, unsigned int jid,
275 unsigned int message)
276 {
277 char env_jid[20];
278 char env_status[20];
279 char *envp[] = { env_jid, env_status, NULL };
280 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
281
282 ls->ls_recover_jid_done = jid;
283 ls->ls_recover_jid_status = message;
284 sprintf(env_jid, "JID=%u", jid);
285 sprintf(env_status, "RECOVERY=%s",
286 message == LM_RD_SUCCESS ? "Done" : "Failed");
287 kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
288
289 if (sdp->sd_lockstruct.ls_ops->lm_recovery_result)
290 sdp->sd_lockstruct.ls_ops->lm_recovery_result(sdp, jid, message);
291 }
292
293 void gfs2_recover_func(struct work_struct *work)
294 {
295 struct gfs2_jdesc *jd = container_of(work, struct gfs2_jdesc, jd_work);
296 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
297 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
298 struct gfs2_log_header_host head;
299 struct gfs2_holder j_gh, ji_gh, thaw_gh;
300 ktime_t t_start, t_jlck, t_jhd, t_tlck, t_rep;
301 int ro = 0;
302 unsigned int pass;
303 int error = 0;
304 int jlocked = 0;
305
306 t_start = ktime_get();
307 if (sdp->sd_args.ar_spectator)
308 goto fail;
309 if (jd->jd_jid != sdp->sd_lockstruct.ls_jid) {
310 fs_info(sdp, "jid=%u: Trying to acquire journal lock...\n",
311 jd->jd_jid);
312 jlocked = 1;
313
314
315 error = gfs2_glock_nq_num(sdp, jd->jd_jid, &gfs2_journal_glops,
316 LM_ST_EXCLUSIVE,
317 LM_FLAG_NOEXP | LM_FLAG_TRY | GL_NOCACHE,
318 &j_gh);
319 switch (error) {
320 case 0:
321 break;
322
323 case GLR_TRYFAILED:
324 fs_info(sdp, "jid=%u: Busy\n", jd->jd_jid);
325 error = 0;
326
327 default:
328 goto fail;
329 };
330
331 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
332 LM_FLAG_NOEXP | GL_NOCACHE, &ji_gh);
333 if (error)
334 goto fail_gunlock_j;
335 } else {
336 fs_info(sdp, "jid=%u, already locked for use\n", jd->jd_jid);
337 }
338
339 t_jlck = ktime_get();
340 fs_info(sdp, "jid=%u: Looking at journal...\n", jd->jd_jid);
341
342 error = gfs2_jdesc_check(jd);
343 if (error)
344 goto fail_gunlock_ji;
345
346 error = gfs2_find_jhead(jd, &head, true);
347 if (error)
348 goto fail_gunlock_ji;
349 t_jhd = ktime_get();
350 fs_info(sdp, "jid=%u: Journal head lookup took %lldms\n", jd->jd_jid,
351 ktime_ms_delta(t_jhd, t_jlck));
352
353 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
354 fs_info(sdp, "jid=%u: Acquiring the transaction lock...\n",
355 jd->jd_jid);
356
357
358
359 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED,
360 LM_FLAG_NOEXP | LM_FLAG_PRIORITY,
361 &thaw_gh);
362 if (error)
363 goto fail_gunlock_ji;
364
365 if (test_bit(SDF_RORECOVERY, &sdp->sd_flags)) {
366 ro = 1;
367 } else if (test_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags)) {
368 if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
369 ro = 1;
370 } else {
371 if (sb_rdonly(sdp->sd_vfs)) {
372
373 ro = bdev_read_only(sdp->sd_vfs->s_bdev);
374 if (!ro) {
375 fs_info(sdp, "recovery required on "
376 "read-only filesystem.\n");
377 fs_info(sdp, "write access will be "
378 "enabled during recovery.\n");
379 }
380 }
381 }
382
383 if (ro) {
384 fs_warn(sdp, "jid=%u: Can't replay: read-only block "
385 "device\n", jd->jd_jid);
386 error = -EROFS;
387 goto fail_gunlock_thaw;
388 }
389
390 t_tlck = ktime_get();
391 fs_info(sdp, "jid=%u: Replaying journal...0x%x to 0x%x\n",
392 jd->jd_jid, head.lh_tail, head.lh_blkno);
393
394 for (pass = 0; pass < 2; pass++) {
395 lops_before_scan(jd, &head, pass);
396 error = foreach_descriptor(jd, head.lh_tail,
397 head.lh_blkno, pass);
398 lops_after_scan(jd, error, pass);
399 if (error)
400 goto fail_gunlock_thaw;
401 }
402
403 clean_journal(jd, &head);
404
405 gfs2_glock_dq_uninit(&thaw_gh);
406 t_rep = ktime_get();
407 fs_info(sdp, "jid=%u: Journal replayed in %lldms [jlck:%lldms, "
408 "jhead:%lldms, tlck:%lldms, replay:%lldms]\n",
409 jd->jd_jid, ktime_ms_delta(t_rep, t_start),
410 ktime_ms_delta(t_jlck, t_start),
411 ktime_ms_delta(t_jhd, t_jlck),
412 ktime_ms_delta(t_tlck, t_jhd),
413 ktime_ms_delta(t_rep, t_tlck));
414 }
415
416 gfs2_recovery_done(sdp, jd->jd_jid, LM_RD_SUCCESS);
417
418 if (jlocked) {
419 gfs2_glock_dq_uninit(&ji_gh);
420 gfs2_glock_dq_uninit(&j_gh);
421 }
422
423 fs_info(sdp, "jid=%u: Done\n", jd->jd_jid);
424 goto done;
425
426 fail_gunlock_thaw:
427 gfs2_glock_dq_uninit(&thaw_gh);
428 fail_gunlock_ji:
429 if (jlocked) {
430 gfs2_glock_dq_uninit(&ji_gh);
431 fail_gunlock_j:
432 gfs2_glock_dq_uninit(&j_gh);
433 }
434
435 fs_info(sdp, "jid=%u: %s\n", jd->jd_jid, (error) ? "Failed" : "Done");
436 fail:
437 jd->jd_recover_error = error;
438 gfs2_recovery_done(sdp, jd->jd_jid, LM_RD_GAVEUP);
439 done:
440 clear_bit(JDF_RECOVERY, &jd->jd_flags);
441 smp_mb__after_atomic();
442 wake_up_bit(&jd->jd_flags, JDF_RECOVERY);
443 }
444
445 int gfs2_recover_journal(struct gfs2_jdesc *jd, bool wait)
446 {
447 int rv;
448
449 if (test_and_set_bit(JDF_RECOVERY, &jd->jd_flags))
450 return -EBUSY;
451
452
453 rv = queue_work(gfs_recovery_wq, &jd->jd_work);
454 BUG_ON(!rv);
455
456 if (wait)
457 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
458 TASK_UNINTERRUPTIBLE);
459
460 return wait ? jd->jd_recover_error : 0;
461 }
462