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1/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 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 version 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 <linux/gfs2_ondisk.h>
16#include <linux/bio.h>
17#include <linux/fs.h>
18
19#include "gfs2.h"
20#include "incore.h"
21#include "inode.h"
22#include "glock.h"
23#include "log.h"
24#include "lops.h"
25#include "meta_io.h"
26#include "recovery.h"
27#include "rgrp.h"
28#include "trans.h"
29#include "util.h"
30#include "trace_gfs2.h"
31
32/**
33 * gfs2_pin - Pin a buffer in memory
34 * @sdp: The superblock
35 * @bh: The buffer to be pinned
36 *
37 * The log lock must be held when calling this function
38 */
39static void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh)
40{
41 struct gfs2_bufdata *bd;
42
43 BUG_ON(!current->journal_info);
44
45 clear_buffer_dirty(bh);
46 if (test_set_buffer_pinned(bh))
47 gfs2_assert_withdraw(sdp, 0);
48 if (!buffer_uptodate(bh))
49 gfs2_io_error_bh(sdp, bh);
50 bd = bh->b_private;
51 /* If this buffer is in the AIL and it has already been written
52 * to in-place disk block, remove it from the AIL.
53 */
54 spin_lock(&sdp->sd_ail_lock);
55 if (bd->bd_ail)
56 list_move(&bd->bd_ail_st_list, &bd->bd_ail->ai_ail2_list);
57 spin_unlock(&sdp->sd_ail_lock);
58 get_bh(bh);
59 atomic_inc(&sdp->sd_log_pinned);
60 trace_gfs2_pin(bd, 1);
61}
62
63/**
64 * gfs2_unpin - Unpin a buffer
65 * @sdp: the filesystem the buffer belongs to
66 * @bh: The buffer to unpin
67 * @ai:
68 * @flags: The inode dirty flags
69 *
70 */
71
72static void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh,
73 struct gfs2_ail *ai)
74{
75 struct gfs2_bufdata *bd = bh->b_private;
76
77 BUG_ON(!buffer_uptodate(bh));
78 BUG_ON(!buffer_pinned(bh));
79
80 lock_buffer(bh);
81 mark_buffer_dirty(bh);
82 clear_buffer_pinned(bh);
83
84 spin_lock(&sdp->sd_ail_lock);
85 if (bd->bd_ail) {
86 list_del(&bd->bd_ail_st_list);
87 brelse(bh);
88 } else {
89 struct gfs2_glock *gl = bd->bd_gl;
90 list_add(&bd->bd_ail_gl_list, &gl->gl_ail_list);
91 atomic_inc(&gl->gl_ail_count);
92 }
93 bd->bd_ail = ai;
94 list_add(&bd->bd_ail_st_list, &ai->ai_ail1_list);
95 spin_unlock(&sdp->sd_ail_lock);
96
97 clear_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
98 trace_gfs2_pin(bd, 0);
99 unlock_buffer(bh);
100 atomic_dec(&sdp->sd_log_pinned);
101}
102
103
104static inline struct gfs2_log_descriptor *bh_log_desc(struct buffer_head *bh)
105{
106 return (struct gfs2_log_descriptor *)bh->b_data;
107}
108
109static inline __be64 *bh_log_ptr(struct buffer_head *bh)
110{
111 struct gfs2_log_descriptor *ld = bh_log_desc(bh);
112 return (__force __be64 *)(ld + 1);
113}
114
115static inline __be64 *bh_ptr_end(struct buffer_head *bh)
116{
117 return (__force __be64 *)(bh->b_data + bh->b_size);
118}
119
120
121static struct buffer_head *gfs2_get_log_desc(struct gfs2_sbd *sdp, u32 ld_type)
122{
123 struct buffer_head *bh = gfs2_log_get_buf(sdp);
124 struct gfs2_log_descriptor *ld = bh_log_desc(bh);
125 ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
126 ld->ld_header.mh_type = cpu_to_be32(GFS2_METATYPE_LD);
127 ld->ld_header.mh_format = cpu_to_be32(GFS2_FORMAT_LD);
128 ld->ld_type = cpu_to_be32(ld_type);
129 ld->ld_length = 0;
130 ld->ld_data1 = 0;
131 ld->ld_data2 = 0;
132 memset(ld->ld_reserved, 0, sizeof(ld->ld_reserved));
133 return bh;
134}
135
136static void buf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
137{
138 struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
139 struct gfs2_meta_header *mh;
140 struct gfs2_trans *tr;
141
142 lock_buffer(bd->bd_bh);
143 gfs2_log_lock(sdp);
144 if (!list_empty(&bd->bd_list_tr))
145 goto out;
146 tr = current->journal_info;
147 tr->tr_touched = 1;
148 tr->tr_num_buf++;
149 list_add(&bd->bd_list_tr, &tr->tr_list_buf);
150 if (!list_empty(&le->le_list))
151 goto out;
152 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
153 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
154 gfs2_meta_check(sdp, bd->bd_bh);
155 gfs2_pin(sdp, bd->bd_bh);
156 mh = (struct gfs2_meta_header *)bd->bd_bh->b_data;
157 mh->__pad0 = cpu_to_be64(0);
158 mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
159 sdp->sd_log_num_buf++;
160 list_add(&le->le_list, &sdp->sd_log_le_buf);
161 tr->tr_num_buf_new++;
162out:
163 gfs2_log_unlock(sdp);
164 unlock_buffer(bd->bd_bh);
165}
166
167static void buf_lo_before_commit(struct gfs2_sbd *sdp)
168{
169 struct buffer_head *bh;
170 struct gfs2_log_descriptor *ld;
171 struct gfs2_bufdata *bd1 = NULL, *bd2;
172 unsigned int total;
173 unsigned int limit;
174 unsigned int num;
175 unsigned n;
176 __be64 *ptr;
177
178 limit = buf_limit(sdp);
179 /* for 4k blocks, limit = 503 */
180
181 gfs2_log_lock(sdp);
182 total = sdp->sd_log_num_buf;
183 bd1 = bd2 = list_prepare_entry(bd1, &sdp->sd_log_le_buf, bd_le.le_list);
184 while(total) {
185 num = total;
186 if (total > limit)
187 num = limit;
188 gfs2_log_unlock(sdp);
189 bh = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_METADATA);
190 gfs2_log_lock(sdp);
191 ld = bh_log_desc(bh);
192 ptr = bh_log_ptr(bh);
193 ld->ld_length = cpu_to_be32(num + 1);
194 ld->ld_data1 = cpu_to_be32(num);
195
196 n = 0;
197 list_for_each_entry_continue(bd1, &sdp->sd_log_le_buf,
198 bd_le.le_list) {
199 *ptr++ = cpu_to_be64(bd1->bd_bh->b_blocknr);
200 if (++n >= num)
201 break;
202 }
203
204 gfs2_log_unlock(sdp);
205 submit_bh(WRITE_SYNC, bh);
206 gfs2_log_lock(sdp);
207
208 n = 0;
209 list_for_each_entry_continue(bd2, &sdp->sd_log_le_buf,
210 bd_le.le_list) {
211 get_bh(bd2->bd_bh);
212 gfs2_log_unlock(sdp);
213 lock_buffer(bd2->bd_bh);
214 bh = gfs2_log_fake_buf(sdp, bd2->bd_bh);
215 submit_bh(WRITE_SYNC, bh);
216 gfs2_log_lock(sdp);
217 if (++n >= num)
218 break;
219 }
220
221 BUG_ON(total < num);
222 total -= num;
223 }
224 gfs2_log_unlock(sdp);
225}
226
227static void buf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
228{
229 struct list_head *head = &sdp->sd_log_le_buf;
230 struct gfs2_bufdata *bd;
231
232 while (!list_empty(head)) {
233 bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
234 list_del_init(&bd->bd_le.le_list);
235 sdp->sd_log_num_buf--;
236
237 gfs2_unpin(sdp, bd->bd_bh, ai);
238 }
239 gfs2_assert_warn(sdp, !sdp->sd_log_num_buf);
240}
241
242static void buf_lo_before_scan(struct gfs2_jdesc *jd,
243 struct gfs2_log_header_host *head, int pass)
244{
245 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
246
247 if (pass != 0)
248 return;
249
250 sdp->sd_found_blocks = 0;
251 sdp->sd_replayed_blocks = 0;
252}
253
254static int buf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
255 struct gfs2_log_descriptor *ld, __be64 *ptr,
256 int pass)
257{
258 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
259 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
260 struct gfs2_glock *gl = ip->i_gl;
261 unsigned int blks = be32_to_cpu(ld->ld_data1);
262 struct buffer_head *bh_log, *bh_ip;
263 u64 blkno;
264 int error = 0;
265
266 if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_METADATA)
267 return 0;
268
269 gfs2_replay_incr_blk(sdp, &start);
270
271 for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
272 blkno = be64_to_cpu(*ptr++);
273
274 sdp->sd_found_blocks++;
275
276 if (gfs2_revoke_check(sdp, blkno, start))
277 continue;
278
279 error = gfs2_replay_read_block(jd, start, &bh_log);
280 if (error)
281 return error;
282
283 bh_ip = gfs2_meta_new(gl, blkno);
284 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
285
286 if (gfs2_meta_check(sdp, bh_ip))
287 error = -EIO;
288 else
289 mark_buffer_dirty(bh_ip);
290
291 brelse(bh_log);
292 brelse(bh_ip);
293
294 if (error)
295 break;
296
297 sdp->sd_replayed_blocks++;
298 }
299
300 return error;
301}
302
303static void buf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
304{
305 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
306 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
307
308 if (error) {
309 gfs2_meta_sync(ip->i_gl);
310 return;
311 }
312 if (pass != 1)
313 return;
314
315 gfs2_meta_sync(ip->i_gl);
316
317 fs_info(sdp, "jid=%u: Replayed %u of %u blocks\n",
318 jd->jd_jid, sdp->sd_replayed_blocks, sdp->sd_found_blocks);
319}
320
321static void revoke_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
322{
323 struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
324 struct gfs2_glock *gl = bd->bd_gl;
325 struct gfs2_trans *tr;
326
327 tr = current->journal_info;
328 tr->tr_touched = 1;
329 tr->tr_num_revoke++;
330 sdp->sd_log_num_revoke++;
331 atomic_inc(&gl->gl_revokes);
332 set_bit(GLF_LFLUSH, &gl->gl_flags);
333 list_add(&le->le_list, &sdp->sd_log_le_revoke);
334}
335
336static void revoke_lo_before_commit(struct gfs2_sbd *sdp)
337{
338 struct gfs2_log_descriptor *ld;
339 struct gfs2_meta_header *mh;
340 struct buffer_head *bh;
341 unsigned int offset;
342 struct list_head *head = &sdp->sd_log_le_revoke;
343 struct gfs2_bufdata *bd;
344
345 if (!sdp->sd_log_num_revoke)
346 return;
347
348 bh = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_REVOKE);
349 ld = bh_log_desc(bh);
350 ld->ld_length = cpu_to_be32(gfs2_struct2blk(sdp, sdp->sd_log_num_revoke,
351 sizeof(u64)));
352 ld->ld_data1 = cpu_to_be32(sdp->sd_log_num_revoke);
353 offset = sizeof(struct gfs2_log_descriptor);
354
355 list_for_each_entry(bd, head, bd_le.le_list) {
356 sdp->sd_log_num_revoke--;
357
358 if (offset + sizeof(u64) > sdp->sd_sb.sb_bsize) {
359 submit_bh(WRITE_SYNC, bh);
360
361 bh = gfs2_log_get_buf(sdp);
362 mh = (struct gfs2_meta_header *)bh->b_data;
363 mh->mh_magic = cpu_to_be32(GFS2_MAGIC);
364 mh->mh_type = cpu_to_be32(GFS2_METATYPE_LB);
365 mh->mh_format = cpu_to_be32(GFS2_FORMAT_LB);
366 offset = sizeof(struct gfs2_meta_header);
367 }
368
369 *(__be64 *)(bh->b_data + offset) = cpu_to_be64(bd->bd_blkno);
370 offset += sizeof(u64);
371 }
372 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
373
374 submit_bh(WRITE_SYNC, bh);
375}
376
377static void revoke_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
378{
379 struct list_head *head = &sdp->sd_log_le_revoke;
380 struct gfs2_bufdata *bd;
381 struct gfs2_glock *gl;
382
383 while (!list_empty(head)) {
384 bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
385 list_del_init(&bd->bd_le.le_list);
386 gl = bd->bd_gl;
387 atomic_dec(&gl->gl_revokes);
388 clear_bit(GLF_LFLUSH, &gl->gl_flags);
389 kmem_cache_free(gfs2_bufdata_cachep, bd);
390 }
391}
392
393static void revoke_lo_before_scan(struct gfs2_jdesc *jd,
394 struct gfs2_log_header_host *head, int pass)
395{
396 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
397
398 if (pass != 0)
399 return;
400
401 sdp->sd_found_revokes = 0;
402 sdp->sd_replay_tail = head->lh_tail;
403}
404
405static int revoke_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
406 struct gfs2_log_descriptor *ld, __be64 *ptr,
407 int pass)
408{
409 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
410 unsigned int blks = be32_to_cpu(ld->ld_length);
411 unsigned int revokes = be32_to_cpu(ld->ld_data1);
412 struct buffer_head *bh;
413 unsigned int offset;
414 u64 blkno;
415 int first = 1;
416 int error;
417
418 if (pass != 0 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_REVOKE)
419 return 0;
420
421 offset = sizeof(struct gfs2_log_descriptor);
422
423 for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
424 error = gfs2_replay_read_block(jd, start, &bh);
425 if (error)
426 return error;
427
428 if (!first)
429 gfs2_metatype_check(sdp, bh, GFS2_METATYPE_LB);
430
431 while (offset + sizeof(u64) <= sdp->sd_sb.sb_bsize) {
432 blkno = be64_to_cpu(*(__be64 *)(bh->b_data + offset));
433
434 error = gfs2_revoke_add(sdp, blkno, start);
435 if (error < 0) {
436 brelse(bh);
437 return error;
438 }
439 else if (error)
440 sdp->sd_found_revokes++;
441
442 if (!--revokes)
443 break;
444 offset += sizeof(u64);
445 }
446
447 brelse(bh);
448 offset = sizeof(struct gfs2_meta_header);
449 first = 0;
450 }
451
452 return 0;
453}
454
455static void revoke_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
456{
457 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
458
459 if (error) {
460 gfs2_revoke_clean(sdp);
461 return;
462 }
463 if (pass != 1)
464 return;
465
466 fs_info(sdp, "jid=%u: Found %u revoke tags\n",
467 jd->jd_jid, sdp->sd_found_revokes);
468
469 gfs2_revoke_clean(sdp);
470}
471
472static void rg_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
473{
474 struct gfs2_rgrpd *rgd;
475 struct gfs2_trans *tr = current->journal_info;
476
477 tr->tr_touched = 1;
478
479 rgd = container_of(le, struct gfs2_rgrpd, rd_le);
480
481 gfs2_log_lock(sdp);
482 if (!list_empty(&le->le_list)){
483 gfs2_log_unlock(sdp);
484 return;
485 }
486 gfs2_rgrp_bh_hold(rgd);
487 sdp->sd_log_num_rg++;
488 list_add(&le->le_list, &sdp->sd_log_le_rg);
489 gfs2_log_unlock(sdp);
490}
491
492static void rg_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
493{
494 struct list_head *head = &sdp->sd_log_le_rg;
495 struct gfs2_rgrpd *rgd;
496
497 while (!list_empty(head)) {
498 rgd = list_entry(head->next, struct gfs2_rgrpd, rd_le.le_list);
499 list_del_init(&rgd->rd_le.le_list);
500 sdp->sd_log_num_rg--;
501
502 gfs2_rgrp_repolish_clones(rgd);
503 gfs2_rgrp_bh_put(rgd);
504 }
505 gfs2_assert_warn(sdp, !sdp->sd_log_num_rg);
506}
507
508/**
509 * databuf_lo_add - Add a databuf to the transaction.
510 *
511 * This is used in two distinct cases:
512 * i) In ordered write mode
513 * We put the data buffer on a list so that we can ensure that its
514 * synced to disk at the right time
515 * ii) In journaled data mode
516 * We need to journal the data block in the same way as metadata in
517 * the functions above. The difference is that here we have a tag
518 * which is two __be64's being the block number (as per meta data)
519 * and a flag which says whether the data block needs escaping or
520 * not. This means we need a new log entry for each 251 or so data
521 * blocks, which isn't an enormous overhead but twice as much as
522 * for normal metadata blocks.
523 */
524static void databuf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
525{
526 struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
527 struct gfs2_trans *tr = current->journal_info;
528 struct address_space *mapping = bd->bd_bh->b_page->mapping;
529 struct gfs2_inode *ip = GFS2_I(mapping->host);
530
531 lock_buffer(bd->bd_bh);
532 gfs2_log_lock(sdp);
533 if (tr) {
534 if (!list_empty(&bd->bd_list_tr))
535 goto out;
536 tr->tr_touched = 1;
537 if (gfs2_is_jdata(ip)) {
538 tr->tr_num_buf++;
539 list_add(&bd->bd_list_tr, &tr->tr_list_buf);
540 }
541 }
542 if (!list_empty(&le->le_list))
543 goto out;
544
545 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
546 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
547 if (gfs2_is_jdata(ip)) {
548 gfs2_pin(sdp, bd->bd_bh);
549 tr->tr_num_databuf_new++;
550 sdp->sd_log_num_databuf++;
551 list_add_tail(&le->le_list, &sdp->sd_log_le_databuf);
552 } else {
553 list_add_tail(&le->le_list, &sdp->sd_log_le_ordered);
554 }
555out:
556 gfs2_log_unlock(sdp);
557 unlock_buffer(bd->bd_bh);
558}
559
560static void gfs2_check_magic(struct buffer_head *bh)
561{
562 void *kaddr;
563 __be32 *ptr;
564
565 clear_buffer_escaped(bh);
566 kaddr = kmap_atomic(bh->b_page, KM_USER0);
567 ptr = kaddr + bh_offset(bh);
568 if (*ptr == cpu_to_be32(GFS2_MAGIC))
569 set_buffer_escaped(bh);
570 kunmap_atomic(kaddr, KM_USER0);
571}
572
573static void gfs2_write_blocks(struct gfs2_sbd *sdp, struct buffer_head *bh,
574 struct list_head *list, struct list_head *done,
575 unsigned int n)
576{
577 struct buffer_head *bh1;
578 struct gfs2_log_descriptor *ld;
579 struct gfs2_bufdata *bd;
580 __be64 *ptr;
581
582 if (!bh)
583 return;
584
585 ld = bh_log_desc(bh);
586 ld->ld_length = cpu_to_be32(n + 1);
587 ld->ld_data1 = cpu_to_be32(n);
588
589 ptr = bh_log_ptr(bh);
590
591 get_bh(bh);
592 submit_bh(WRITE_SYNC, bh);
593 gfs2_log_lock(sdp);
594 while(!list_empty(list)) {
595 bd = list_entry(list->next, struct gfs2_bufdata, bd_le.le_list);
596 list_move_tail(&bd->bd_le.le_list, done);
597 get_bh(bd->bd_bh);
598 while (be64_to_cpu(*ptr) != bd->bd_bh->b_blocknr) {
599 gfs2_log_incr_head(sdp);
600 ptr += 2;
601 }
602 gfs2_log_unlock(sdp);
603 lock_buffer(bd->bd_bh);
604 if (buffer_escaped(bd->bd_bh)) {
605 void *kaddr;
606 bh1 = gfs2_log_get_buf(sdp);
607 kaddr = kmap_atomic(bd->bd_bh->b_page, KM_USER0);
608 memcpy(bh1->b_data, kaddr + bh_offset(bd->bd_bh),
609 bh1->b_size);
610 kunmap_atomic(kaddr, KM_USER0);
611 *(__be32 *)bh1->b_data = 0;
612 clear_buffer_escaped(bd->bd_bh);
613 unlock_buffer(bd->bd_bh);
614 brelse(bd->bd_bh);
615 } else {
616 bh1 = gfs2_log_fake_buf(sdp, bd->bd_bh);
617 }
618 submit_bh(WRITE_SYNC, bh1);
619 gfs2_log_lock(sdp);
620 ptr += 2;
621 }
622 gfs2_log_unlock(sdp);
623 brelse(bh);
624}
625
626/**
627 * databuf_lo_before_commit - Scan the data buffers, writing as we go
628 *
629 */
630
631static void databuf_lo_before_commit(struct gfs2_sbd *sdp)
632{
633 struct gfs2_bufdata *bd = NULL;
634 struct buffer_head *bh = NULL;
635 unsigned int n = 0;
636 __be64 *ptr = NULL, *end = NULL;
637 LIST_HEAD(processed);
638 LIST_HEAD(in_progress);
639
640 gfs2_log_lock(sdp);
641 while (!list_empty(&sdp->sd_log_le_databuf)) {
642 if (ptr == end) {
643 gfs2_log_unlock(sdp);
644 gfs2_write_blocks(sdp, bh, &in_progress, &processed, n);
645 n = 0;
646 bh = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_JDATA);
647 ptr = bh_log_ptr(bh);
648 end = bh_ptr_end(bh) - 1;
649 gfs2_log_lock(sdp);
650 continue;
651 }
652 bd = list_entry(sdp->sd_log_le_databuf.next, struct gfs2_bufdata, bd_le.le_list);
653 list_move_tail(&bd->bd_le.le_list, &in_progress);
654 gfs2_check_magic(bd->bd_bh);
655 *ptr++ = cpu_to_be64(bd->bd_bh->b_blocknr);
656 *ptr++ = cpu_to_be64(buffer_escaped(bh) ? 1 : 0);
657 n++;
658 }
659 gfs2_log_unlock(sdp);
660 gfs2_write_blocks(sdp, bh, &in_progress, &processed, n);
661 gfs2_log_lock(sdp);
662 list_splice(&processed, &sdp->sd_log_le_databuf);
663 gfs2_log_unlock(sdp);
664}
665
666static int databuf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
667 struct gfs2_log_descriptor *ld,
668 __be64 *ptr, int pass)
669{
670 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
671 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
672 struct gfs2_glock *gl = ip->i_gl;
673 unsigned int blks = be32_to_cpu(ld->ld_data1);
674 struct buffer_head *bh_log, *bh_ip;
675 u64 blkno;
676 u64 esc;
677 int error = 0;
678
679 if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_JDATA)
680 return 0;
681
682 gfs2_replay_incr_blk(sdp, &start);
683 for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
684 blkno = be64_to_cpu(*ptr++);
685 esc = be64_to_cpu(*ptr++);
686
687 sdp->sd_found_blocks++;
688
689 if (gfs2_revoke_check(sdp, blkno, start))
690 continue;
691
692 error = gfs2_replay_read_block(jd, start, &bh_log);
693 if (error)
694 return error;
695
696 bh_ip = gfs2_meta_new(gl, blkno);
697 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
698
699 /* Unescape */
700 if (esc) {
701 __be32 *eptr = (__be32 *)bh_ip->b_data;
702 *eptr = cpu_to_be32(GFS2_MAGIC);
703 }
704 mark_buffer_dirty(bh_ip);
705
706 brelse(bh_log);
707 brelse(bh_ip);
708 if (error)
709 break;
710
711 sdp->sd_replayed_blocks++;
712 }
713
714 return error;
715}
716
717/* FIXME: sort out accounting for log blocks etc. */
718
719static void databuf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
720{
721 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
722 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
723
724 if (error) {
725 gfs2_meta_sync(ip->i_gl);
726 return;
727 }
728 if (pass != 1)
729 return;
730
731 /* data sync? */
732 gfs2_meta_sync(ip->i_gl);
733
734 fs_info(sdp, "jid=%u: Replayed %u of %u data blocks\n",
735 jd->jd_jid, sdp->sd_replayed_blocks, sdp->sd_found_blocks);
736}
737
738static void databuf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
739{
740 struct list_head *head = &sdp->sd_log_le_databuf;
741 struct gfs2_bufdata *bd;
742
743 while (!list_empty(head)) {
744 bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
745 list_del_init(&bd->bd_le.le_list);
746 sdp->sd_log_num_databuf--;
747 gfs2_unpin(sdp, bd->bd_bh, ai);
748 }
749 gfs2_assert_warn(sdp, !sdp->sd_log_num_databuf);
750}
751
752
753const struct gfs2_log_operations gfs2_buf_lops = {
754 .lo_add = buf_lo_add,
755 .lo_before_commit = buf_lo_before_commit,
756 .lo_after_commit = buf_lo_after_commit,
757 .lo_before_scan = buf_lo_before_scan,
758 .lo_scan_elements = buf_lo_scan_elements,
759 .lo_after_scan = buf_lo_after_scan,
760 .lo_name = "buf",
761};
762
763const struct gfs2_log_operations gfs2_revoke_lops = {
764 .lo_add = revoke_lo_add,
765 .lo_before_commit = revoke_lo_before_commit,
766 .lo_after_commit = revoke_lo_after_commit,
767 .lo_before_scan = revoke_lo_before_scan,
768 .lo_scan_elements = revoke_lo_scan_elements,
769 .lo_after_scan = revoke_lo_after_scan,
770 .lo_name = "revoke",
771};
772
773const struct gfs2_log_operations gfs2_rg_lops = {
774 .lo_add = rg_lo_add,
775 .lo_after_commit = rg_lo_after_commit,
776 .lo_name = "rg",
777};
778
779const struct gfs2_log_operations gfs2_databuf_lops = {
780 .lo_add = databuf_lo_add,
781 .lo_before_commit = databuf_lo_before_commit,
782 .lo_after_commit = databuf_lo_after_commit,
783 .lo_scan_elements = databuf_lo_scan_elements,
784 .lo_after_scan = databuf_lo_after_scan,
785 .lo_name = "databuf",
786};
787
788const struct gfs2_log_operations *gfs2_log_ops[] = {
789 &gfs2_databuf_lops,
790 &gfs2_buf_lops,
791 &gfs2_rg_lops,
792 &gfs2_revoke_lops,
793 NULL,
794};
795
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#include <linux/sched.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/mempool.h>
13#include <linux/gfs2_ondisk.h>
14#include <linux/bio.h>
15#include <linux/fs.h>
16#include <linux/list_sort.h>
17#include <linux/blkdev.h>
18
19#include "bmap.h"
20#include "dir.h"
21#include "gfs2.h"
22#include "incore.h"
23#include "inode.h"
24#include "glock.h"
25#include "glops.h"
26#include "log.h"
27#include "lops.h"
28#include "meta_io.h"
29#include "recovery.h"
30#include "rgrp.h"
31#include "trans.h"
32#include "util.h"
33#include "trace_gfs2.h"
34
35/**
36 * gfs2_pin - Pin a buffer in memory
37 * @sdp: The superblock
38 * @bh: The buffer to be pinned
39 *
40 * The log lock must be held when calling this function
41 */
42void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh)
43{
44 struct gfs2_bufdata *bd;
45
46 BUG_ON(!current->journal_info);
47
48 clear_buffer_dirty(bh);
49 if (test_set_buffer_pinned(bh))
50 gfs2_assert_withdraw(sdp, 0);
51 if (!buffer_uptodate(bh))
52 gfs2_io_error_bh_wd(sdp, bh);
53 bd = bh->b_private;
54 /* If this buffer is in the AIL and it has already been written
55 * to in-place disk block, remove it from the AIL.
56 */
57 spin_lock(&sdp->sd_ail_lock);
58 if (bd->bd_tr)
59 list_move(&bd->bd_ail_st_list, &bd->bd_tr->tr_ail2_list);
60 spin_unlock(&sdp->sd_ail_lock);
61 get_bh(bh);
62 atomic_inc(&sdp->sd_log_pinned);
63 trace_gfs2_pin(bd, 1);
64}
65
66static bool buffer_is_rgrp(const struct gfs2_bufdata *bd)
67{
68 return bd->bd_gl->gl_name.ln_type == LM_TYPE_RGRP;
69}
70
71static void maybe_release_space(struct gfs2_bufdata *bd)
72{
73 struct gfs2_glock *gl = bd->bd_gl;
74 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
75 struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(gl);
76 unsigned int index = bd->bd_bh->b_blocknr - gl->gl_name.ln_number;
77 struct gfs2_bitmap *bi = rgd->rd_bits + index;
78
79 rgrp_lock_local(rgd);
80 if (bi->bi_clone == NULL)
81 goto out;
82 if (sdp->sd_args.ar_discard)
83 gfs2_rgrp_send_discards(sdp, rgd->rd_data0, bd->bd_bh, bi, 1, NULL);
84 memcpy(bi->bi_clone + bi->bi_offset,
85 bd->bd_bh->b_data + bi->bi_offset, bi->bi_bytes);
86 clear_bit(GBF_FULL, &bi->bi_flags);
87 rgd->rd_free_clone = rgd->rd_free;
88 BUG_ON(rgd->rd_free_clone < rgd->rd_reserved);
89 rgd->rd_extfail_pt = rgd->rd_free;
90
91out:
92 rgrp_unlock_local(rgd);
93}
94
95/**
96 * gfs2_unpin - Unpin a buffer
97 * @sdp: the filesystem the buffer belongs to
98 * @bh: The buffer to unpin
99 * @tr: The system transaction being flushed
100 */
101
102static void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh,
103 struct gfs2_trans *tr)
104{
105 struct gfs2_bufdata *bd = bh->b_private;
106
107 BUG_ON(!buffer_uptodate(bh));
108 BUG_ON(!buffer_pinned(bh));
109
110 lock_buffer(bh);
111 mark_buffer_dirty(bh);
112 clear_buffer_pinned(bh);
113
114 if (buffer_is_rgrp(bd))
115 maybe_release_space(bd);
116
117 spin_lock(&sdp->sd_ail_lock);
118 if (bd->bd_tr) {
119 list_del(&bd->bd_ail_st_list);
120 brelse(bh);
121 } else {
122 struct gfs2_glock *gl = bd->bd_gl;
123 list_add(&bd->bd_ail_gl_list, &gl->gl_ail_list);
124 atomic_inc(&gl->gl_ail_count);
125 }
126 bd->bd_tr = tr;
127 list_add(&bd->bd_ail_st_list, &tr->tr_ail1_list);
128 spin_unlock(&sdp->sd_ail_lock);
129
130 clear_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
131 trace_gfs2_pin(bd, 0);
132 unlock_buffer(bh);
133 atomic_dec(&sdp->sd_log_pinned);
134}
135
136void gfs2_log_incr_head(struct gfs2_sbd *sdp)
137{
138 BUG_ON((sdp->sd_log_flush_head == sdp->sd_log_tail) &&
139 (sdp->sd_log_flush_head != sdp->sd_log_head));
140
141 if (++sdp->sd_log_flush_head == sdp->sd_jdesc->jd_blocks)
142 sdp->sd_log_flush_head = 0;
143}
144
145u64 gfs2_log_bmap(struct gfs2_jdesc *jd, unsigned int lblock)
146{
147 struct gfs2_journal_extent *je;
148
149 list_for_each_entry(je, &jd->extent_list, list) {
150 if (lblock >= je->lblock && lblock < je->lblock + je->blocks)
151 return je->dblock + lblock - je->lblock;
152 }
153
154 return -1;
155}
156
157/**
158 * gfs2_end_log_write_bh - end log write of pagecache data with buffers
159 * @sdp: The superblock
160 * @bvec: The bio_vec
161 * @error: The i/o status
162 *
163 * This finds the relevant buffers and unlocks them and sets the
164 * error flag according to the status of the i/o request. This is
165 * used when the log is writing data which has an in-place version
166 * that is pinned in the pagecache.
167 */
168
169static void gfs2_end_log_write_bh(struct gfs2_sbd *sdp,
170 struct bio_vec *bvec,
171 blk_status_t error)
172{
173 struct buffer_head *bh, *next;
174 struct page *page = bvec->bv_page;
175 unsigned size;
176
177 bh = page_buffers(page);
178 size = bvec->bv_len;
179 while (bh_offset(bh) < bvec->bv_offset)
180 bh = bh->b_this_page;
181 do {
182 if (error)
183 mark_buffer_write_io_error(bh);
184 unlock_buffer(bh);
185 next = bh->b_this_page;
186 size -= bh->b_size;
187 brelse(bh);
188 bh = next;
189 } while(bh && size);
190}
191
192/**
193 * gfs2_end_log_write - end of i/o to the log
194 * @bio: The bio
195 *
196 * Each bio_vec contains either data from the pagecache or data
197 * relating to the log itself. Here we iterate over the bio_vec
198 * array, processing both kinds of data.
199 *
200 */
201
202static void gfs2_end_log_write(struct bio *bio)
203{
204 struct gfs2_sbd *sdp = bio->bi_private;
205 struct bio_vec *bvec;
206 struct page *page;
207 struct bvec_iter_all iter_all;
208
209 if (bio->bi_status) {
210 if (!cmpxchg(&sdp->sd_log_error, 0, (int)bio->bi_status))
211 fs_err(sdp, "Error %d writing to journal, jid=%u\n",
212 bio->bi_status, sdp->sd_jdesc->jd_jid);
213 gfs2_withdraw_delayed(sdp);
214 /* prevent more writes to the journal */
215 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
216 wake_up(&sdp->sd_logd_waitq);
217 }
218
219 bio_for_each_segment_all(bvec, bio, iter_all) {
220 page = bvec->bv_page;
221 if (page_has_buffers(page))
222 gfs2_end_log_write_bh(sdp, bvec, bio->bi_status);
223 else
224 mempool_free(page, gfs2_page_pool);
225 }
226
227 bio_put(bio);
228 if (atomic_dec_and_test(&sdp->sd_log_in_flight))
229 wake_up(&sdp->sd_log_flush_wait);
230}
231
232/**
233 * gfs2_log_submit_bio - Submit any pending log bio
234 * @biop: Address of the bio pointer
235 * @opf: REQ_OP | op_flags
236 *
237 * Submit any pending part-built or full bio to the block device. If
238 * there is no pending bio, then this is a no-op.
239 */
240
241void gfs2_log_submit_bio(struct bio **biop, blk_opf_t opf)
242{
243 struct bio *bio = *biop;
244 if (bio) {
245 struct gfs2_sbd *sdp = bio->bi_private;
246 atomic_inc(&sdp->sd_log_in_flight);
247 bio->bi_opf = opf;
248 submit_bio(bio);
249 *biop = NULL;
250 }
251}
252
253/**
254 * gfs2_log_alloc_bio - Allocate a bio
255 * @sdp: The super block
256 * @blkno: The device block number we want to write to
257 * @end_io: The bi_end_io callback
258 *
259 * Allocate a new bio, initialize it with the given parameters and return it.
260 *
261 * Returns: The newly allocated bio
262 */
263
264static struct bio *gfs2_log_alloc_bio(struct gfs2_sbd *sdp, u64 blkno,
265 bio_end_io_t *end_io)
266{
267 struct super_block *sb = sdp->sd_vfs;
268 struct bio *bio = bio_alloc(sb->s_bdev, BIO_MAX_VECS, 0, GFP_NOIO);
269
270 bio->bi_iter.bi_sector = blkno << sdp->sd_fsb2bb_shift;
271 bio->bi_end_io = end_io;
272 bio->bi_private = sdp;
273
274 return bio;
275}
276
277/**
278 * gfs2_log_get_bio - Get cached log bio, or allocate a new one
279 * @sdp: The super block
280 * @blkno: The device block number we want to write to
281 * @biop: The bio to get or allocate
282 * @op: REQ_OP
283 * @end_io: The bi_end_io callback
284 * @flush: Always flush the current bio and allocate a new one?
285 *
286 * If there is a cached bio, then if the next block number is sequential
287 * with the previous one, return it, otherwise flush the bio to the
288 * device. If there is no cached bio, or we just flushed it, then
289 * allocate a new one.
290 *
291 * Returns: The bio to use for log writes
292 */
293
294static struct bio *gfs2_log_get_bio(struct gfs2_sbd *sdp, u64 blkno,
295 struct bio **biop, enum req_op op,
296 bio_end_io_t *end_io, bool flush)
297{
298 struct bio *bio = *biop;
299
300 if (bio) {
301 u64 nblk;
302
303 nblk = bio_end_sector(bio);
304 nblk >>= sdp->sd_fsb2bb_shift;
305 if (blkno == nblk && !flush)
306 return bio;
307 gfs2_log_submit_bio(biop, op);
308 }
309
310 *biop = gfs2_log_alloc_bio(sdp, blkno, end_io);
311 return *biop;
312}
313
314/**
315 * gfs2_log_write - write to log
316 * @sdp: the filesystem
317 * @jd: The journal descriptor
318 * @page: the page to write
319 * @size: the size of the data to write
320 * @offset: the offset within the page
321 * @blkno: block number of the log entry
322 *
323 * Try and add the page segment to the current bio. If that fails,
324 * submit the current bio to the device and create a new one, and
325 * then add the page segment to that.
326 */
327
328void gfs2_log_write(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd,
329 struct page *page, unsigned size, unsigned offset,
330 u64 blkno)
331{
332 struct bio *bio;
333 int ret;
334
335 bio = gfs2_log_get_bio(sdp, blkno, &jd->jd_log_bio, REQ_OP_WRITE,
336 gfs2_end_log_write, false);
337 ret = bio_add_page(bio, page, size, offset);
338 if (ret == 0) {
339 bio = gfs2_log_get_bio(sdp, blkno, &jd->jd_log_bio,
340 REQ_OP_WRITE, gfs2_end_log_write, true);
341 ret = bio_add_page(bio, page, size, offset);
342 WARN_ON(ret == 0);
343 }
344}
345
346/**
347 * gfs2_log_write_bh - write a buffer's content to the log
348 * @sdp: The super block
349 * @bh: The buffer pointing to the in-place location
350 *
351 * This writes the content of the buffer to the next available location
352 * in the log. The buffer will be unlocked once the i/o to the log has
353 * completed.
354 */
355
356static void gfs2_log_write_bh(struct gfs2_sbd *sdp, struct buffer_head *bh)
357{
358 u64 dblock;
359
360 dblock = gfs2_log_bmap(sdp->sd_jdesc, sdp->sd_log_flush_head);
361 gfs2_log_incr_head(sdp);
362 gfs2_log_write(sdp, sdp->sd_jdesc, bh->b_page, bh->b_size,
363 bh_offset(bh), dblock);
364}
365
366/**
367 * gfs2_log_write_page - write one block stored in a page, into the log
368 * @sdp: The superblock
369 * @page: The struct page
370 *
371 * This writes the first block-sized part of the page into the log. Note
372 * that the page must have been allocated from the gfs2_page_pool mempool
373 * and that after this has been called, ownership has been transferred and
374 * the page may be freed at any time.
375 */
376
377static void gfs2_log_write_page(struct gfs2_sbd *sdp, struct page *page)
378{
379 struct super_block *sb = sdp->sd_vfs;
380 u64 dblock;
381
382 dblock = gfs2_log_bmap(sdp->sd_jdesc, sdp->sd_log_flush_head);
383 gfs2_log_incr_head(sdp);
384 gfs2_log_write(sdp, sdp->sd_jdesc, page, sb->s_blocksize, 0, dblock);
385}
386
387/**
388 * gfs2_end_log_read - end I/O callback for reads from the log
389 * @bio: The bio
390 *
391 * Simply unlock the pages in the bio. The main thread will wait on them and
392 * process them in order as necessary.
393 */
394
395static void gfs2_end_log_read(struct bio *bio)
396{
397 struct page *page;
398 struct bio_vec *bvec;
399 struct bvec_iter_all iter_all;
400
401 bio_for_each_segment_all(bvec, bio, iter_all) {
402 page = bvec->bv_page;
403 if (bio->bi_status) {
404 int err = blk_status_to_errno(bio->bi_status);
405
406 SetPageError(page);
407 mapping_set_error(page->mapping, err);
408 }
409 unlock_page(page);
410 }
411
412 bio_put(bio);
413}
414
415/**
416 * gfs2_jhead_pg_srch - Look for the journal head in a given page.
417 * @jd: The journal descriptor
418 * @head: The journal head to start from
419 * @page: The page to look in
420 *
421 * Returns: 1 if found, 0 otherwise.
422 */
423
424static bool gfs2_jhead_pg_srch(struct gfs2_jdesc *jd,
425 struct gfs2_log_header_host *head,
426 struct page *page)
427{
428 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
429 struct gfs2_log_header_host lh;
430 void *kaddr = kmap_atomic(page);
431 unsigned int offset;
432 bool ret = false;
433
434 for (offset = 0; offset < PAGE_SIZE; offset += sdp->sd_sb.sb_bsize) {
435 if (!__get_log_header(sdp, kaddr + offset, 0, &lh)) {
436 if (lh.lh_sequence >= head->lh_sequence)
437 *head = lh;
438 else {
439 ret = true;
440 break;
441 }
442 }
443 }
444 kunmap_atomic(kaddr);
445 return ret;
446}
447
448/**
449 * gfs2_jhead_process_page - Search/cleanup a page
450 * @jd: The journal descriptor
451 * @index: Index of the page to look into
452 * @head: The journal head to start from
453 * @done: If set, perform only cleanup, else search and set if found.
454 *
455 * Find the folio with 'index' in the journal's mapping. Search the folio for
456 * the journal head if requested (cleanup == false). Release refs on the
457 * folio so the page cache can reclaim it. We grabbed a
458 * reference on this folio twice, first when we did a find_or_create_page()
459 * to obtain the folio to add it to the bio and second when we do a
460 * filemap_get_folio() here to get the folio to wait on while I/O on it is being
461 * completed.
462 * This function is also used to free up a folio we might've grabbed but not
463 * used. Maybe we added it to a bio, but not submitted it for I/O. Or we
464 * submitted the I/O, but we already found the jhead so we only need to drop
465 * our references to the folio.
466 */
467
468static void gfs2_jhead_process_page(struct gfs2_jdesc *jd, unsigned long index,
469 struct gfs2_log_header_host *head,
470 bool *done)
471{
472 struct folio *folio;
473
474 folio = filemap_get_folio(jd->jd_inode->i_mapping, index);
475
476 folio_wait_locked(folio);
477 if (folio_test_error(folio))
478 *done = true;
479
480 if (!*done)
481 *done = gfs2_jhead_pg_srch(jd, head, &folio->page);
482
483 /* filemap_get_folio() and the earlier find_or_create_page() */
484 folio_put_refs(folio, 2);
485}
486
487static struct bio *gfs2_chain_bio(struct bio *prev, unsigned int nr_iovecs)
488{
489 struct bio *new;
490
491 new = bio_alloc(prev->bi_bdev, nr_iovecs, prev->bi_opf, GFP_NOIO);
492 bio_clone_blkg_association(new, prev);
493 new->bi_iter.bi_sector = bio_end_sector(prev);
494 bio_chain(new, prev);
495 submit_bio(prev);
496 return new;
497}
498
499/**
500 * gfs2_find_jhead - find the head of a log
501 * @jd: The journal descriptor
502 * @head: The log descriptor for the head of the log is returned here
503 * @keep_cache: If set inode pages will not be truncated
504 *
505 * Do a search of a journal by reading it in large chunks using bios and find
506 * the valid log entry with the highest sequence number. (i.e. the log head)
507 *
508 * Returns: 0 on success, errno otherwise
509 */
510int gfs2_find_jhead(struct gfs2_jdesc *jd, struct gfs2_log_header_host *head,
511 bool keep_cache)
512{
513 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
514 struct address_space *mapping = jd->jd_inode->i_mapping;
515 unsigned int block = 0, blocks_submitted = 0, blocks_read = 0;
516 unsigned int bsize = sdp->sd_sb.sb_bsize, off;
517 unsigned int bsize_shift = sdp->sd_sb.sb_bsize_shift;
518 unsigned int shift = PAGE_SHIFT - bsize_shift;
519 unsigned int max_blocks = 2 * 1024 * 1024 >> bsize_shift;
520 struct gfs2_journal_extent *je;
521 int sz, ret = 0;
522 struct bio *bio = NULL;
523 struct page *page = NULL;
524 bool done = false;
525 errseq_t since;
526
527 memset(head, 0, sizeof(*head));
528 if (list_empty(&jd->extent_list))
529 gfs2_map_journal_extents(sdp, jd);
530
531 since = filemap_sample_wb_err(mapping);
532 list_for_each_entry(je, &jd->extent_list, list) {
533 u64 dblock = je->dblock;
534
535 for (; block < je->lblock + je->blocks; block++, dblock++) {
536 if (!page) {
537 page = find_or_create_page(mapping,
538 block >> shift, GFP_NOFS);
539 if (!page) {
540 ret = -ENOMEM;
541 done = true;
542 goto out;
543 }
544 off = 0;
545 }
546
547 if (bio && (off || block < blocks_submitted + max_blocks)) {
548 sector_t sector = dblock << sdp->sd_fsb2bb_shift;
549
550 if (bio_end_sector(bio) == sector) {
551 sz = bio_add_page(bio, page, bsize, off);
552 if (sz == bsize)
553 goto block_added;
554 }
555 if (off) {
556 unsigned int blocks =
557 (PAGE_SIZE - off) >> bsize_shift;
558
559 bio = gfs2_chain_bio(bio, blocks);
560 goto add_block_to_new_bio;
561 }
562 }
563
564 if (bio) {
565 blocks_submitted = block;
566 submit_bio(bio);
567 }
568
569 bio = gfs2_log_alloc_bio(sdp, dblock, gfs2_end_log_read);
570 bio->bi_opf = REQ_OP_READ;
571add_block_to_new_bio:
572 sz = bio_add_page(bio, page, bsize, off);
573 BUG_ON(sz != bsize);
574block_added:
575 off += bsize;
576 if (off == PAGE_SIZE)
577 page = NULL;
578 if (blocks_submitted <= blocks_read + max_blocks) {
579 /* Keep at least one bio in flight */
580 continue;
581 }
582
583 gfs2_jhead_process_page(jd, blocks_read >> shift, head, &done);
584 blocks_read += PAGE_SIZE >> bsize_shift;
585 if (done)
586 goto out; /* found */
587 }
588 }
589
590out:
591 if (bio)
592 submit_bio(bio);
593 while (blocks_read < block) {
594 gfs2_jhead_process_page(jd, blocks_read >> shift, head, &done);
595 blocks_read += PAGE_SIZE >> bsize_shift;
596 }
597
598 if (!ret)
599 ret = filemap_check_wb_err(mapping, since);
600
601 if (!keep_cache)
602 truncate_inode_pages(mapping, 0);
603
604 return ret;
605}
606
607static struct page *gfs2_get_log_desc(struct gfs2_sbd *sdp, u32 ld_type,
608 u32 ld_length, u32 ld_data1)
609{
610 struct page *page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
611 struct gfs2_log_descriptor *ld = page_address(page);
612 clear_page(ld);
613 ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
614 ld->ld_header.mh_type = cpu_to_be32(GFS2_METATYPE_LD);
615 ld->ld_header.mh_format = cpu_to_be32(GFS2_FORMAT_LD);
616 ld->ld_type = cpu_to_be32(ld_type);
617 ld->ld_length = cpu_to_be32(ld_length);
618 ld->ld_data1 = cpu_to_be32(ld_data1);
619 ld->ld_data2 = 0;
620 return page;
621}
622
623static void gfs2_check_magic(struct buffer_head *bh)
624{
625 void *kaddr;
626 __be32 *ptr;
627
628 clear_buffer_escaped(bh);
629 kaddr = kmap_atomic(bh->b_page);
630 ptr = kaddr + bh_offset(bh);
631 if (*ptr == cpu_to_be32(GFS2_MAGIC))
632 set_buffer_escaped(bh);
633 kunmap_atomic(kaddr);
634}
635
636static int blocknr_cmp(void *priv, const struct list_head *a,
637 const struct list_head *b)
638{
639 struct gfs2_bufdata *bda, *bdb;
640
641 bda = list_entry(a, struct gfs2_bufdata, bd_list);
642 bdb = list_entry(b, struct gfs2_bufdata, bd_list);
643
644 if (bda->bd_bh->b_blocknr < bdb->bd_bh->b_blocknr)
645 return -1;
646 if (bda->bd_bh->b_blocknr > bdb->bd_bh->b_blocknr)
647 return 1;
648 return 0;
649}
650
651static void gfs2_before_commit(struct gfs2_sbd *sdp, unsigned int limit,
652 unsigned int total, struct list_head *blist,
653 bool is_databuf)
654{
655 struct gfs2_log_descriptor *ld;
656 struct gfs2_bufdata *bd1 = NULL, *bd2;
657 struct page *page;
658 unsigned int num;
659 unsigned n;
660 __be64 *ptr;
661
662 gfs2_log_lock(sdp);
663 list_sort(NULL, blist, blocknr_cmp);
664 bd1 = bd2 = list_prepare_entry(bd1, blist, bd_list);
665 while(total) {
666 num = total;
667 if (total > limit)
668 num = limit;
669 gfs2_log_unlock(sdp);
670 page = gfs2_get_log_desc(sdp,
671 is_databuf ? GFS2_LOG_DESC_JDATA :
672 GFS2_LOG_DESC_METADATA, num + 1, num);
673 ld = page_address(page);
674 gfs2_log_lock(sdp);
675 ptr = (__be64 *)(ld + 1);
676
677 n = 0;
678 list_for_each_entry_continue(bd1, blist, bd_list) {
679 *ptr++ = cpu_to_be64(bd1->bd_bh->b_blocknr);
680 if (is_databuf) {
681 gfs2_check_magic(bd1->bd_bh);
682 *ptr++ = cpu_to_be64(buffer_escaped(bd1->bd_bh) ? 1 : 0);
683 }
684 if (++n >= num)
685 break;
686 }
687
688 gfs2_log_unlock(sdp);
689 gfs2_log_write_page(sdp, page);
690 gfs2_log_lock(sdp);
691
692 n = 0;
693 list_for_each_entry_continue(bd2, blist, bd_list) {
694 get_bh(bd2->bd_bh);
695 gfs2_log_unlock(sdp);
696 lock_buffer(bd2->bd_bh);
697
698 if (buffer_escaped(bd2->bd_bh)) {
699 void *kaddr;
700 page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
701 ptr = page_address(page);
702 kaddr = kmap_atomic(bd2->bd_bh->b_page);
703 memcpy(ptr, kaddr + bh_offset(bd2->bd_bh),
704 bd2->bd_bh->b_size);
705 kunmap_atomic(kaddr);
706 *(__be32 *)ptr = 0;
707 clear_buffer_escaped(bd2->bd_bh);
708 unlock_buffer(bd2->bd_bh);
709 brelse(bd2->bd_bh);
710 gfs2_log_write_page(sdp, page);
711 } else {
712 gfs2_log_write_bh(sdp, bd2->bd_bh);
713 }
714 gfs2_log_lock(sdp);
715 if (++n >= num)
716 break;
717 }
718
719 BUG_ON(total < num);
720 total -= num;
721 }
722 gfs2_log_unlock(sdp);
723}
724
725static void buf_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
726{
727 unsigned int limit = buf_limit(sdp); /* 503 for 4k blocks */
728 unsigned int nbuf;
729 if (tr == NULL)
730 return;
731 nbuf = tr->tr_num_buf_new - tr->tr_num_buf_rm;
732 gfs2_before_commit(sdp, limit, nbuf, &tr->tr_buf, 0);
733}
734
735static void buf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
736{
737 struct list_head *head;
738 struct gfs2_bufdata *bd;
739
740 if (tr == NULL)
741 return;
742
743 head = &tr->tr_buf;
744 while (!list_empty(head)) {
745 bd = list_first_entry(head, struct gfs2_bufdata, bd_list);
746 list_del_init(&bd->bd_list);
747 gfs2_unpin(sdp, bd->bd_bh, tr);
748 }
749}
750
751static void buf_lo_before_scan(struct gfs2_jdesc *jd,
752 struct gfs2_log_header_host *head, int pass)
753{
754 if (pass != 0)
755 return;
756
757 jd->jd_found_blocks = 0;
758 jd->jd_replayed_blocks = 0;
759}
760
761#define obsolete_rgrp_replay \
762"Replaying 0x%llx from jid=%d/0x%llx but we already have a bh!\n"
763#define obsolete_rgrp_replay2 \
764"busy:%d, pinned:%d rg_gen:0x%llx, j_gen:0x%llx\n"
765
766static void obsolete_rgrp(struct gfs2_jdesc *jd, struct buffer_head *bh_log,
767 u64 blkno)
768{
769 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
770 struct gfs2_rgrpd *rgd;
771 struct gfs2_rgrp *jrgd = (struct gfs2_rgrp *)bh_log->b_data;
772
773 rgd = gfs2_blk2rgrpd(sdp, blkno, false);
774 if (rgd && rgd->rd_addr == blkno &&
775 rgd->rd_bits && rgd->rd_bits->bi_bh) {
776 fs_info(sdp, obsolete_rgrp_replay, (unsigned long long)blkno,
777 jd->jd_jid, bh_log->b_blocknr);
778 fs_info(sdp, obsolete_rgrp_replay2,
779 buffer_busy(rgd->rd_bits->bi_bh) ? 1 : 0,
780 buffer_pinned(rgd->rd_bits->bi_bh),
781 rgd->rd_igeneration,
782 be64_to_cpu(jrgd->rg_igeneration));
783 gfs2_dump_glock(NULL, rgd->rd_gl, true);
784 }
785}
786
787static int buf_lo_scan_elements(struct gfs2_jdesc *jd, u32 start,
788 struct gfs2_log_descriptor *ld, __be64 *ptr,
789 int pass)
790{
791 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
792 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
793 struct gfs2_glock *gl = ip->i_gl;
794 unsigned int blks = be32_to_cpu(ld->ld_data1);
795 struct buffer_head *bh_log, *bh_ip;
796 u64 blkno;
797 int error = 0;
798
799 if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_METADATA)
800 return 0;
801
802 gfs2_replay_incr_blk(jd, &start);
803
804 for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) {
805 blkno = be64_to_cpu(*ptr++);
806
807 jd->jd_found_blocks++;
808
809 if (gfs2_revoke_check(jd, blkno, start))
810 continue;
811
812 error = gfs2_replay_read_block(jd, start, &bh_log);
813 if (error)
814 return error;
815
816 bh_ip = gfs2_meta_new(gl, blkno);
817 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
818
819 if (gfs2_meta_check(sdp, bh_ip))
820 error = -EIO;
821 else {
822 struct gfs2_meta_header *mh =
823 (struct gfs2_meta_header *)bh_ip->b_data;
824
825 if (mh->mh_type == cpu_to_be32(GFS2_METATYPE_RG))
826 obsolete_rgrp(jd, bh_log, blkno);
827
828 mark_buffer_dirty(bh_ip);
829 }
830 brelse(bh_log);
831 brelse(bh_ip);
832
833 if (error)
834 break;
835
836 jd->jd_replayed_blocks++;
837 }
838
839 return error;
840}
841
842static void buf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
843{
844 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
845 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
846
847 if (error) {
848 gfs2_inode_metasync(ip->i_gl);
849 return;
850 }
851 if (pass != 1)
852 return;
853
854 gfs2_inode_metasync(ip->i_gl);
855
856 fs_info(sdp, "jid=%u: Replayed %u of %u blocks\n",
857 jd->jd_jid, jd->jd_replayed_blocks, jd->jd_found_blocks);
858}
859
860static void revoke_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
861{
862 struct gfs2_meta_header *mh;
863 unsigned int offset;
864 struct list_head *head = &sdp->sd_log_revokes;
865 struct gfs2_bufdata *bd;
866 struct page *page;
867 unsigned int length;
868
869 gfs2_flush_revokes(sdp);
870 if (!sdp->sd_log_num_revoke)
871 return;
872
873 length = gfs2_struct2blk(sdp, sdp->sd_log_num_revoke);
874 page = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_REVOKE, length, sdp->sd_log_num_revoke);
875 offset = sizeof(struct gfs2_log_descriptor);
876
877 list_for_each_entry(bd, head, bd_list) {
878 sdp->sd_log_num_revoke--;
879
880 if (offset + sizeof(u64) > sdp->sd_sb.sb_bsize) {
881 gfs2_log_write_page(sdp, page);
882 page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
883 mh = page_address(page);
884 clear_page(mh);
885 mh->mh_magic = cpu_to_be32(GFS2_MAGIC);
886 mh->mh_type = cpu_to_be32(GFS2_METATYPE_LB);
887 mh->mh_format = cpu_to_be32(GFS2_FORMAT_LB);
888 offset = sizeof(struct gfs2_meta_header);
889 }
890
891 *(__be64 *)(page_address(page) + offset) = cpu_to_be64(bd->bd_blkno);
892 offset += sizeof(u64);
893 }
894 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
895
896 gfs2_log_write_page(sdp, page);
897}
898
899void gfs2_drain_revokes(struct gfs2_sbd *sdp)
900{
901 struct list_head *head = &sdp->sd_log_revokes;
902 struct gfs2_bufdata *bd;
903 struct gfs2_glock *gl;
904
905 while (!list_empty(head)) {
906 bd = list_first_entry(head, struct gfs2_bufdata, bd_list);
907 list_del_init(&bd->bd_list);
908 gl = bd->bd_gl;
909 gfs2_glock_remove_revoke(gl);
910 kmem_cache_free(gfs2_bufdata_cachep, bd);
911 }
912}
913
914static void revoke_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
915{
916 gfs2_drain_revokes(sdp);
917}
918
919static void revoke_lo_before_scan(struct gfs2_jdesc *jd,
920 struct gfs2_log_header_host *head, int pass)
921{
922 if (pass != 0)
923 return;
924
925 jd->jd_found_revokes = 0;
926 jd->jd_replay_tail = head->lh_tail;
927}
928
929static int revoke_lo_scan_elements(struct gfs2_jdesc *jd, u32 start,
930 struct gfs2_log_descriptor *ld, __be64 *ptr,
931 int pass)
932{
933 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
934 unsigned int blks = be32_to_cpu(ld->ld_length);
935 unsigned int revokes = be32_to_cpu(ld->ld_data1);
936 struct buffer_head *bh;
937 unsigned int offset;
938 u64 blkno;
939 int first = 1;
940 int error;
941
942 if (pass != 0 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_REVOKE)
943 return 0;
944
945 offset = sizeof(struct gfs2_log_descriptor);
946
947 for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) {
948 error = gfs2_replay_read_block(jd, start, &bh);
949 if (error)
950 return error;
951
952 if (!first)
953 gfs2_metatype_check(sdp, bh, GFS2_METATYPE_LB);
954
955 while (offset + sizeof(u64) <= sdp->sd_sb.sb_bsize) {
956 blkno = be64_to_cpu(*(__be64 *)(bh->b_data + offset));
957
958 error = gfs2_revoke_add(jd, blkno, start);
959 if (error < 0) {
960 brelse(bh);
961 return error;
962 }
963 else if (error)
964 jd->jd_found_revokes++;
965
966 if (!--revokes)
967 break;
968 offset += sizeof(u64);
969 }
970
971 brelse(bh);
972 offset = sizeof(struct gfs2_meta_header);
973 first = 0;
974 }
975
976 return 0;
977}
978
979static void revoke_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
980{
981 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
982
983 if (error) {
984 gfs2_revoke_clean(jd);
985 return;
986 }
987 if (pass != 1)
988 return;
989
990 fs_info(sdp, "jid=%u: Found %u revoke tags\n",
991 jd->jd_jid, jd->jd_found_revokes);
992
993 gfs2_revoke_clean(jd);
994}
995
996/**
997 * databuf_lo_before_commit - Scan the data buffers, writing as we go
998 * @sdp: The filesystem
999 * @tr: The system transaction being flushed
1000 */
1001
1002static void databuf_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
1003{
1004 unsigned int limit = databuf_limit(sdp);
1005 unsigned int nbuf;
1006 if (tr == NULL)
1007 return;
1008 nbuf = tr->tr_num_databuf_new - tr->tr_num_databuf_rm;
1009 gfs2_before_commit(sdp, limit, nbuf, &tr->tr_databuf, 1);
1010}
1011
1012static int databuf_lo_scan_elements(struct gfs2_jdesc *jd, u32 start,
1013 struct gfs2_log_descriptor *ld,
1014 __be64 *ptr, int pass)
1015{
1016 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
1017 struct gfs2_glock *gl = ip->i_gl;
1018 unsigned int blks = be32_to_cpu(ld->ld_data1);
1019 struct buffer_head *bh_log, *bh_ip;
1020 u64 blkno;
1021 u64 esc;
1022 int error = 0;
1023
1024 if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_JDATA)
1025 return 0;
1026
1027 gfs2_replay_incr_blk(jd, &start);
1028 for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) {
1029 blkno = be64_to_cpu(*ptr++);
1030 esc = be64_to_cpu(*ptr++);
1031
1032 jd->jd_found_blocks++;
1033
1034 if (gfs2_revoke_check(jd, blkno, start))
1035 continue;
1036
1037 error = gfs2_replay_read_block(jd, start, &bh_log);
1038 if (error)
1039 return error;
1040
1041 bh_ip = gfs2_meta_new(gl, blkno);
1042 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
1043
1044 /* Unescape */
1045 if (esc) {
1046 __be32 *eptr = (__be32 *)bh_ip->b_data;
1047 *eptr = cpu_to_be32(GFS2_MAGIC);
1048 }
1049 mark_buffer_dirty(bh_ip);
1050
1051 brelse(bh_log);
1052 brelse(bh_ip);
1053
1054 jd->jd_replayed_blocks++;
1055 }
1056
1057 return error;
1058}
1059
1060/* FIXME: sort out accounting for log blocks etc. */
1061
1062static void databuf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
1063{
1064 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
1065 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
1066
1067 if (error) {
1068 gfs2_inode_metasync(ip->i_gl);
1069 return;
1070 }
1071 if (pass != 1)
1072 return;
1073
1074 /* data sync? */
1075 gfs2_inode_metasync(ip->i_gl);
1076
1077 fs_info(sdp, "jid=%u: Replayed %u of %u data blocks\n",
1078 jd->jd_jid, jd->jd_replayed_blocks, jd->jd_found_blocks);
1079}
1080
1081static void databuf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
1082{
1083 struct list_head *head;
1084 struct gfs2_bufdata *bd;
1085
1086 if (tr == NULL)
1087 return;
1088
1089 head = &tr->tr_databuf;
1090 while (!list_empty(head)) {
1091 bd = list_first_entry(head, struct gfs2_bufdata, bd_list);
1092 list_del_init(&bd->bd_list);
1093 gfs2_unpin(sdp, bd->bd_bh, tr);
1094 }
1095}
1096
1097
1098static const struct gfs2_log_operations gfs2_buf_lops = {
1099 .lo_before_commit = buf_lo_before_commit,
1100 .lo_after_commit = buf_lo_after_commit,
1101 .lo_before_scan = buf_lo_before_scan,
1102 .lo_scan_elements = buf_lo_scan_elements,
1103 .lo_after_scan = buf_lo_after_scan,
1104 .lo_name = "buf",
1105};
1106
1107static const struct gfs2_log_operations gfs2_revoke_lops = {
1108 .lo_before_commit = revoke_lo_before_commit,
1109 .lo_after_commit = revoke_lo_after_commit,
1110 .lo_before_scan = revoke_lo_before_scan,
1111 .lo_scan_elements = revoke_lo_scan_elements,
1112 .lo_after_scan = revoke_lo_after_scan,
1113 .lo_name = "revoke",
1114};
1115
1116static const struct gfs2_log_operations gfs2_databuf_lops = {
1117 .lo_before_commit = databuf_lo_before_commit,
1118 .lo_after_commit = databuf_lo_after_commit,
1119 .lo_scan_elements = databuf_lo_scan_elements,
1120 .lo_after_scan = databuf_lo_after_scan,
1121 .lo_name = "databuf",
1122};
1123
1124const struct gfs2_log_operations *gfs2_log_ops[] = {
1125 &gfs2_databuf_lops,
1126 &gfs2_buf_lops,
1127 &gfs2_revoke_lops,
1128 NULL,
1129};
1130