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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/mempool.h>
16#include <linux/gfs2_ondisk.h>
17#include <linux/bio.h>
18#include <linux/fs.h>
19#include <linux/list_sort.h>
20
21#include "dir.h"
22#include "gfs2.h"
23#include "incore.h"
24#include "inode.h"
25#include "glock.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(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 if (bi->bi_clone == NULL)
80 return;
81 if (sdp->sd_args.ar_discard)
82 gfs2_rgrp_send_discards(sdp, rgd->rd_data0, bd->bd_bh, bi, 1, NULL);
83 memcpy(bi->bi_clone + bi->bi_offset,
84 bd->bd_bh->b_data + bi->bi_offset, bi->bi_len);
85 clear_bit(GBF_FULL, &bi->bi_flags);
86 rgd->rd_free_clone = rgd->rd_free;
87 rgd->rd_extfail_pt = rgd->rd_free;
88}
89
90/**
91 * gfs2_unpin - Unpin a buffer
92 * @sdp: the filesystem the buffer belongs to
93 * @bh: The buffer to unpin
94 * @ai:
95 * @flags: The inode dirty flags
96 *
97 */
98
99static void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh,
100 struct gfs2_trans *tr)
101{
102 struct gfs2_bufdata *bd = bh->b_private;
103
104 BUG_ON(!buffer_uptodate(bh));
105 BUG_ON(!buffer_pinned(bh));
106
107 lock_buffer(bh);
108 mark_buffer_dirty(bh);
109 clear_buffer_pinned(bh);
110
111 if (buffer_is_rgrp(bd))
112 maybe_release_space(bd);
113
114 spin_lock(&sdp->sd_ail_lock);
115 if (bd->bd_tr) {
116 list_del(&bd->bd_ail_st_list);
117 brelse(bh);
118 } else {
119 struct gfs2_glock *gl = bd->bd_gl;
120 list_add(&bd->bd_ail_gl_list, &gl->gl_ail_list);
121 atomic_inc(&gl->gl_ail_count);
122 }
123 bd->bd_tr = tr;
124 list_add(&bd->bd_ail_st_list, &tr->tr_ail1_list);
125 spin_unlock(&sdp->sd_ail_lock);
126
127 clear_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
128 trace_gfs2_pin(bd, 0);
129 unlock_buffer(bh);
130 atomic_dec(&sdp->sd_log_pinned);
131}
132
133static void gfs2_log_incr_head(struct gfs2_sbd *sdp)
134{
135 BUG_ON((sdp->sd_log_flush_head == sdp->sd_log_tail) &&
136 (sdp->sd_log_flush_head != sdp->sd_log_head));
137
138 if (++sdp->sd_log_flush_head == sdp->sd_jdesc->jd_blocks)
139 sdp->sd_log_flush_head = 0;
140}
141
142u64 gfs2_log_bmap(struct gfs2_sbd *sdp)
143{
144 unsigned int lbn = sdp->sd_log_flush_head;
145 struct gfs2_journal_extent *je;
146 u64 block;
147
148 list_for_each_entry(je, &sdp->sd_jdesc->extent_list, list) {
149 if ((lbn >= je->lblock) && (lbn < (je->lblock + je->blocks))) {
150 block = je->dblock + lbn - je->lblock;
151 gfs2_log_incr_head(sdp);
152 return block;
153 }
154 }
155
156 return -1;
157}
158
159/**
160 * gfs2_end_log_write_bh - end log write of pagecache data with buffers
161 * @sdp: The superblock
162 * @bvec: The bio_vec
163 * @error: The i/o status
164 *
165 * This finds the relevant buffers and unlocks them and sets the
166 * error flag according to the status of the i/o request. This is
167 * used when the log is writing data which has an in-place version
168 * that is pinned in the pagecache.
169 */
170
171static void gfs2_end_log_write_bh(struct gfs2_sbd *sdp, struct bio_vec *bvec,
172 blk_status_t error)
173{
174 struct buffer_head *bh, *next;
175 struct page *page = bvec->bv_page;
176 unsigned size;
177
178 bh = page_buffers(page);
179 size = bvec->bv_len;
180 while (bh_offset(bh) < bvec->bv_offset)
181 bh = bh->b_this_page;
182 do {
183 if (error)
184 mark_buffer_write_io_error(bh);
185 unlock_buffer(bh);
186 next = bh->b_this_page;
187 size -= bh->b_size;
188 brelse(bh);
189 bh = next;
190 } while(bh && size);
191}
192
193/**
194 * gfs2_end_log_write - end of i/o to the log
195 * @bio: The bio
196 * @error: Status of i/o request
197 *
198 * Each bio_vec contains either data from the pagecache or data
199 * relating to the log itself. Here we iterate over the bio_vec
200 * array, processing both kinds of data.
201 *
202 */
203
204static void gfs2_end_log_write(struct bio *bio)
205{
206 struct gfs2_sbd *sdp = bio->bi_private;
207 struct bio_vec *bvec;
208 struct page *page;
209 int i;
210
211 if (bio->bi_status) {
212 fs_err(sdp, "Error %d writing to journal, jid=%u\n",
213 bio->bi_status, sdp->sd_jdesc->jd_jid);
214 wake_up(&sdp->sd_logd_waitq);
215 }
216
217 bio_for_each_segment_all(bvec, bio, i) {
218 page = bvec->bv_page;
219 if (page_has_buffers(page))
220 gfs2_end_log_write_bh(sdp, bvec, bio->bi_status);
221 else
222 mempool_free(page, gfs2_page_pool);
223 }
224
225 bio_put(bio);
226 if (atomic_dec_and_test(&sdp->sd_log_in_flight))
227 wake_up(&sdp->sd_log_flush_wait);
228}
229
230/**
231 * gfs2_log_flush_bio - Submit any pending log bio
232 * @sdp: The superblock
233 * @op: REQ_OP
234 * @op_flags: req_flag_bits
235 *
236 * Submit any pending part-built or full bio to the block device. If
237 * there is no pending bio, then this is a no-op.
238 */
239
240void gfs2_log_flush_bio(struct gfs2_sbd *sdp, int op, int op_flags)
241{
242 if (sdp->sd_log_bio) {
243 atomic_inc(&sdp->sd_log_in_flight);
244 bio_set_op_attrs(sdp->sd_log_bio, op, op_flags);
245 submit_bio(sdp->sd_log_bio);
246 sdp->sd_log_bio = NULL;
247 }
248}
249
250/**
251 * gfs2_log_alloc_bio - Allocate a new bio for log writing
252 * @sdp: The superblock
253 * @blkno: The next device block number we want to write to
254 *
255 * This should never be called when there is a cached bio in the
256 * super block. When it returns, there will be a cached bio in the
257 * super block which will have as many bio_vecs as the device is
258 * happy to handle.
259 *
260 * Returns: Newly allocated bio
261 */
262
263static struct bio *gfs2_log_alloc_bio(struct gfs2_sbd *sdp, u64 blkno)
264{
265 struct super_block *sb = sdp->sd_vfs;
266 struct bio *bio;
267
268 BUG_ON(sdp->sd_log_bio);
269
270 bio = bio_alloc(GFP_NOIO, BIO_MAX_PAGES);
271 bio->bi_iter.bi_sector = blkno * (sb->s_blocksize >> 9);
272 bio_set_dev(bio, sb->s_bdev);
273 bio->bi_end_io = gfs2_end_log_write;
274 bio->bi_private = sdp;
275
276 sdp->sd_log_bio = bio;
277
278 return bio;
279}
280
281/**
282 * gfs2_log_get_bio - Get cached log bio, or allocate a new one
283 * @sdp: The superblock
284 * @blkno: The device block number we want to write to
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 not a 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{
296 struct bio *bio = sdp->sd_log_bio;
297 u64 nblk;
298
299 if (bio) {
300 nblk = bio_end_sector(bio);
301 nblk >>= sdp->sd_fsb2bb_shift;
302 if (blkno == nblk)
303 return bio;
304 gfs2_log_flush_bio(sdp, REQ_OP_WRITE, 0);
305 }
306
307 return gfs2_log_alloc_bio(sdp, blkno);
308}
309
310/**
311 * gfs2_log_write - write to log
312 * @sdp: the filesystem
313 * @page: the page to write
314 * @size: the size of the data to write
315 * @offset: the offset within the page
316 * @blkno: block number of the log entry
317 *
318 * Try and add the page segment to the current bio. If that fails,
319 * submit the current bio to the device and create a new one, and
320 * then add the page segment to that.
321 */
322
323void gfs2_log_write(struct gfs2_sbd *sdp, struct page *page,
324 unsigned size, unsigned offset, u64 blkno)
325{
326 struct bio *bio;
327 int ret;
328
329 bio = gfs2_log_get_bio(sdp, blkno);
330 ret = bio_add_page(bio, page, size, offset);
331 if (ret == 0) {
332 gfs2_log_flush_bio(sdp, REQ_OP_WRITE, 0);
333 bio = gfs2_log_alloc_bio(sdp, blkno);
334 ret = bio_add_page(bio, page, size, offset);
335 WARN_ON(ret == 0);
336 }
337}
338
339/**
340 * gfs2_log_write_bh - write a buffer's content to the log
341 * @sdp: The super block
342 * @bh: The buffer pointing to the in-place location
343 *
344 * This writes the content of the buffer to the next available location
345 * in the log. The buffer will be unlocked once the i/o to the log has
346 * completed.
347 */
348
349static void gfs2_log_write_bh(struct gfs2_sbd *sdp, struct buffer_head *bh)
350{
351 gfs2_log_write(sdp, bh->b_page, bh->b_size, bh_offset(bh),
352 gfs2_log_bmap(sdp));
353}
354
355/**
356 * gfs2_log_write_page - write one block stored in a page, into the log
357 * @sdp: The superblock
358 * @page: The struct page
359 *
360 * This writes the first block-sized part of the page into the log. Note
361 * that the page must have been allocated from the gfs2_page_pool mempool
362 * and that after this has been called, ownership has been transferred and
363 * the page may be freed at any time.
364 */
365
366void gfs2_log_write_page(struct gfs2_sbd *sdp, struct page *page)
367{
368 struct super_block *sb = sdp->sd_vfs;
369 gfs2_log_write(sdp, page, sb->s_blocksize, 0,
370 gfs2_log_bmap(sdp));
371}
372
373static struct page *gfs2_get_log_desc(struct gfs2_sbd *sdp, u32 ld_type,
374 u32 ld_length, u32 ld_data1)
375{
376 struct page *page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
377 struct gfs2_log_descriptor *ld = page_address(page);
378 clear_page(ld);
379 ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
380 ld->ld_header.mh_type = cpu_to_be32(GFS2_METATYPE_LD);
381 ld->ld_header.mh_format = cpu_to_be32(GFS2_FORMAT_LD);
382 ld->ld_type = cpu_to_be32(ld_type);
383 ld->ld_length = cpu_to_be32(ld_length);
384 ld->ld_data1 = cpu_to_be32(ld_data1);
385 ld->ld_data2 = 0;
386 return page;
387}
388
389static void gfs2_check_magic(struct buffer_head *bh)
390{
391 void *kaddr;
392 __be32 *ptr;
393
394 clear_buffer_escaped(bh);
395 kaddr = kmap_atomic(bh->b_page);
396 ptr = kaddr + bh_offset(bh);
397 if (*ptr == cpu_to_be32(GFS2_MAGIC))
398 set_buffer_escaped(bh);
399 kunmap_atomic(kaddr);
400}
401
402static int blocknr_cmp(void *priv, struct list_head *a, struct list_head *b)
403{
404 struct gfs2_bufdata *bda, *bdb;
405
406 bda = list_entry(a, struct gfs2_bufdata, bd_list);
407 bdb = list_entry(b, struct gfs2_bufdata, bd_list);
408
409 if (bda->bd_bh->b_blocknr < bdb->bd_bh->b_blocknr)
410 return -1;
411 if (bda->bd_bh->b_blocknr > bdb->bd_bh->b_blocknr)
412 return 1;
413 return 0;
414}
415
416static void gfs2_before_commit(struct gfs2_sbd *sdp, unsigned int limit,
417 unsigned int total, struct list_head *blist,
418 bool is_databuf)
419{
420 struct gfs2_log_descriptor *ld;
421 struct gfs2_bufdata *bd1 = NULL, *bd2;
422 struct page *page;
423 unsigned int num;
424 unsigned n;
425 __be64 *ptr;
426
427 gfs2_log_lock(sdp);
428 list_sort(NULL, blist, blocknr_cmp);
429 bd1 = bd2 = list_prepare_entry(bd1, blist, bd_list);
430 while(total) {
431 num = total;
432 if (total > limit)
433 num = limit;
434 gfs2_log_unlock(sdp);
435 page = gfs2_get_log_desc(sdp,
436 is_databuf ? GFS2_LOG_DESC_JDATA :
437 GFS2_LOG_DESC_METADATA, num + 1, num);
438 ld = page_address(page);
439 gfs2_log_lock(sdp);
440 ptr = (__be64 *)(ld + 1);
441
442 n = 0;
443 list_for_each_entry_continue(bd1, blist, bd_list) {
444 *ptr++ = cpu_to_be64(bd1->bd_bh->b_blocknr);
445 if (is_databuf) {
446 gfs2_check_magic(bd1->bd_bh);
447 *ptr++ = cpu_to_be64(buffer_escaped(bd1->bd_bh) ? 1 : 0);
448 }
449 if (++n >= num)
450 break;
451 }
452
453 gfs2_log_unlock(sdp);
454 gfs2_log_write_page(sdp, page);
455 gfs2_log_lock(sdp);
456
457 n = 0;
458 list_for_each_entry_continue(bd2, blist, bd_list) {
459 get_bh(bd2->bd_bh);
460 gfs2_log_unlock(sdp);
461 lock_buffer(bd2->bd_bh);
462
463 if (buffer_escaped(bd2->bd_bh)) {
464 void *kaddr;
465 page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
466 ptr = page_address(page);
467 kaddr = kmap_atomic(bd2->bd_bh->b_page);
468 memcpy(ptr, kaddr + bh_offset(bd2->bd_bh),
469 bd2->bd_bh->b_size);
470 kunmap_atomic(kaddr);
471 *(__be32 *)ptr = 0;
472 clear_buffer_escaped(bd2->bd_bh);
473 unlock_buffer(bd2->bd_bh);
474 brelse(bd2->bd_bh);
475 gfs2_log_write_page(sdp, page);
476 } else {
477 gfs2_log_write_bh(sdp, bd2->bd_bh);
478 }
479 gfs2_log_lock(sdp);
480 if (++n >= num)
481 break;
482 }
483
484 BUG_ON(total < num);
485 total -= num;
486 }
487 gfs2_log_unlock(sdp);
488}
489
490static void buf_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
491{
492 unsigned int limit = buf_limit(sdp); /* 503 for 4k blocks */
493 unsigned int nbuf;
494 if (tr == NULL)
495 return;
496 nbuf = tr->tr_num_buf_new - tr->tr_num_buf_rm;
497 gfs2_before_commit(sdp, limit, nbuf, &tr->tr_buf, 0);
498}
499
500static void buf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
501{
502 struct list_head *head;
503 struct gfs2_bufdata *bd;
504
505 if (tr == NULL)
506 return;
507
508 head = &tr->tr_buf;
509 while (!list_empty(head)) {
510 bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
511 list_del_init(&bd->bd_list);
512 gfs2_unpin(sdp, bd->bd_bh, tr);
513 }
514}
515
516static void buf_lo_before_scan(struct gfs2_jdesc *jd,
517 struct gfs2_log_header_host *head, int pass)
518{
519 if (pass != 0)
520 return;
521
522 jd->jd_found_blocks = 0;
523 jd->jd_replayed_blocks = 0;
524}
525
526static int buf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
527 struct gfs2_log_descriptor *ld, __be64 *ptr,
528 int pass)
529{
530 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
531 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
532 struct gfs2_glock *gl = ip->i_gl;
533 unsigned int blks = be32_to_cpu(ld->ld_data1);
534 struct buffer_head *bh_log, *bh_ip;
535 u64 blkno;
536 int error = 0;
537
538 if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_METADATA)
539 return 0;
540
541 gfs2_replay_incr_blk(jd, &start);
542
543 for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) {
544 blkno = be64_to_cpu(*ptr++);
545
546 jd->jd_found_blocks++;
547
548 if (gfs2_revoke_check(jd, blkno, start))
549 continue;
550
551 error = gfs2_replay_read_block(jd, start, &bh_log);
552 if (error)
553 return error;
554
555 bh_ip = gfs2_meta_new(gl, blkno);
556 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
557
558 if (gfs2_meta_check(sdp, bh_ip))
559 error = -EIO;
560 else
561 mark_buffer_dirty(bh_ip);
562
563 brelse(bh_log);
564 brelse(bh_ip);
565
566 if (error)
567 break;
568
569 jd->jd_replayed_blocks++;
570 }
571
572 return error;
573}
574
575/**
576 * gfs2_meta_sync - Sync all buffers associated with a glock
577 * @gl: The glock
578 *
579 */
580
581static void gfs2_meta_sync(struct gfs2_glock *gl)
582{
583 struct address_space *mapping = gfs2_glock2aspace(gl);
584 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
585 int error;
586
587 if (mapping == NULL)
588 mapping = &sdp->sd_aspace;
589
590 filemap_fdatawrite(mapping);
591 error = filemap_fdatawait(mapping);
592
593 if (error)
594 gfs2_io_error(gl->gl_name.ln_sbd);
595}
596
597static void buf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
598{
599 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
600 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
601
602 if (error) {
603 gfs2_meta_sync(ip->i_gl);
604 return;
605 }
606 if (pass != 1)
607 return;
608
609 gfs2_meta_sync(ip->i_gl);
610
611 fs_info(sdp, "jid=%u: Replayed %u of %u blocks\n",
612 jd->jd_jid, jd->jd_replayed_blocks, jd->jd_found_blocks);
613}
614
615static void revoke_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
616{
617 struct gfs2_meta_header *mh;
618 unsigned int offset;
619 struct list_head *head = &sdp->sd_log_le_revoke;
620 struct gfs2_bufdata *bd;
621 struct page *page;
622 unsigned int length;
623
624 gfs2_write_revokes(sdp);
625 if (!sdp->sd_log_num_revoke)
626 return;
627
628 length = gfs2_struct2blk(sdp, sdp->sd_log_num_revoke, sizeof(u64));
629 page = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_REVOKE, length, sdp->sd_log_num_revoke);
630 offset = sizeof(struct gfs2_log_descriptor);
631
632 list_for_each_entry(bd, head, bd_list) {
633 sdp->sd_log_num_revoke--;
634
635 if (offset + sizeof(u64) > sdp->sd_sb.sb_bsize) {
636
637 gfs2_log_write_page(sdp, page);
638 page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
639 mh = page_address(page);
640 clear_page(mh);
641 mh->mh_magic = cpu_to_be32(GFS2_MAGIC);
642 mh->mh_type = cpu_to_be32(GFS2_METATYPE_LB);
643 mh->mh_format = cpu_to_be32(GFS2_FORMAT_LB);
644 offset = sizeof(struct gfs2_meta_header);
645 }
646
647 *(__be64 *)(page_address(page) + offset) = cpu_to_be64(bd->bd_blkno);
648 offset += sizeof(u64);
649 }
650 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
651
652 gfs2_log_write_page(sdp, page);
653}
654
655static void revoke_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
656{
657 struct list_head *head = &sdp->sd_log_le_revoke;
658 struct gfs2_bufdata *bd;
659 struct gfs2_glock *gl;
660
661 while (!list_empty(head)) {
662 bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
663 list_del_init(&bd->bd_list);
664 gl = bd->bd_gl;
665 atomic_dec(&gl->gl_revokes);
666 clear_bit(GLF_LFLUSH, &gl->gl_flags);
667 kmem_cache_free(gfs2_bufdata_cachep, bd);
668 }
669}
670
671static void revoke_lo_before_scan(struct gfs2_jdesc *jd,
672 struct gfs2_log_header_host *head, int pass)
673{
674 if (pass != 0)
675 return;
676
677 jd->jd_found_revokes = 0;
678 jd->jd_replay_tail = head->lh_tail;
679}
680
681static int revoke_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
682 struct gfs2_log_descriptor *ld, __be64 *ptr,
683 int pass)
684{
685 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
686 unsigned int blks = be32_to_cpu(ld->ld_length);
687 unsigned int revokes = be32_to_cpu(ld->ld_data1);
688 struct buffer_head *bh;
689 unsigned int offset;
690 u64 blkno;
691 int first = 1;
692 int error;
693
694 if (pass != 0 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_REVOKE)
695 return 0;
696
697 offset = sizeof(struct gfs2_log_descriptor);
698
699 for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) {
700 error = gfs2_replay_read_block(jd, start, &bh);
701 if (error)
702 return error;
703
704 if (!first)
705 gfs2_metatype_check(sdp, bh, GFS2_METATYPE_LB);
706
707 while (offset + sizeof(u64) <= sdp->sd_sb.sb_bsize) {
708 blkno = be64_to_cpu(*(__be64 *)(bh->b_data + offset));
709
710 error = gfs2_revoke_add(jd, blkno, start);
711 if (error < 0) {
712 brelse(bh);
713 return error;
714 }
715 else if (error)
716 jd->jd_found_revokes++;
717
718 if (!--revokes)
719 break;
720 offset += sizeof(u64);
721 }
722
723 brelse(bh);
724 offset = sizeof(struct gfs2_meta_header);
725 first = 0;
726 }
727
728 return 0;
729}
730
731static void revoke_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
732{
733 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
734
735 if (error) {
736 gfs2_revoke_clean(jd);
737 return;
738 }
739 if (pass != 1)
740 return;
741
742 fs_info(sdp, "jid=%u: Found %u revoke tags\n",
743 jd->jd_jid, jd->jd_found_revokes);
744
745 gfs2_revoke_clean(jd);
746}
747
748/**
749 * databuf_lo_before_commit - Scan the data buffers, writing as we go
750 *
751 */
752
753static void databuf_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
754{
755 unsigned int limit = databuf_limit(sdp);
756 unsigned int nbuf;
757 if (tr == NULL)
758 return;
759 nbuf = tr->tr_num_databuf_new - tr->tr_num_databuf_rm;
760 gfs2_before_commit(sdp, limit, nbuf, &tr->tr_databuf, 1);
761}
762
763static int databuf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
764 struct gfs2_log_descriptor *ld,
765 __be64 *ptr, int pass)
766{
767 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
768 struct gfs2_glock *gl = ip->i_gl;
769 unsigned int blks = be32_to_cpu(ld->ld_data1);
770 struct buffer_head *bh_log, *bh_ip;
771 u64 blkno;
772 u64 esc;
773 int error = 0;
774
775 if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_JDATA)
776 return 0;
777
778 gfs2_replay_incr_blk(jd, &start);
779 for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) {
780 blkno = be64_to_cpu(*ptr++);
781 esc = be64_to_cpu(*ptr++);
782
783 jd->jd_found_blocks++;
784
785 if (gfs2_revoke_check(jd, blkno, start))
786 continue;
787
788 error = gfs2_replay_read_block(jd, start, &bh_log);
789 if (error)
790 return error;
791
792 bh_ip = gfs2_meta_new(gl, blkno);
793 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
794
795 /* Unescape */
796 if (esc) {
797 __be32 *eptr = (__be32 *)bh_ip->b_data;
798 *eptr = cpu_to_be32(GFS2_MAGIC);
799 }
800 mark_buffer_dirty(bh_ip);
801
802 brelse(bh_log);
803 brelse(bh_ip);
804
805 jd->jd_replayed_blocks++;
806 }
807
808 return error;
809}
810
811/* FIXME: sort out accounting for log blocks etc. */
812
813static void databuf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
814{
815 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
816 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
817
818 if (error) {
819 gfs2_meta_sync(ip->i_gl);
820 return;
821 }
822 if (pass != 1)
823 return;
824
825 /* data sync? */
826 gfs2_meta_sync(ip->i_gl);
827
828 fs_info(sdp, "jid=%u: Replayed %u of %u data blocks\n",
829 jd->jd_jid, jd->jd_replayed_blocks, jd->jd_found_blocks);
830}
831
832static void databuf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
833{
834 struct list_head *head;
835 struct gfs2_bufdata *bd;
836
837 if (tr == NULL)
838 return;
839
840 head = &tr->tr_databuf;
841 while (!list_empty(head)) {
842 bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
843 list_del_init(&bd->bd_list);
844 gfs2_unpin(sdp, bd->bd_bh, tr);
845 }
846}
847
848
849const struct gfs2_log_operations gfs2_buf_lops = {
850 .lo_before_commit = buf_lo_before_commit,
851 .lo_after_commit = buf_lo_after_commit,
852 .lo_before_scan = buf_lo_before_scan,
853 .lo_scan_elements = buf_lo_scan_elements,
854 .lo_after_scan = buf_lo_after_scan,
855 .lo_name = "buf",
856};
857
858const struct gfs2_log_operations gfs2_revoke_lops = {
859 .lo_before_commit = revoke_lo_before_commit,
860 .lo_after_commit = revoke_lo_after_commit,
861 .lo_before_scan = revoke_lo_before_scan,
862 .lo_scan_elements = revoke_lo_scan_elements,
863 .lo_after_scan = revoke_lo_after_scan,
864 .lo_name = "revoke",
865};
866
867const struct gfs2_log_operations gfs2_databuf_lops = {
868 .lo_before_commit = databuf_lo_before_commit,
869 .lo_after_commit = databuf_lo_after_commit,
870 .lo_scan_elements = databuf_lo_scan_elements,
871 .lo_after_scan = databuf_lo_after_scan,
872 .lo_name = "databuf",
873};
874
875const struct gfs2_log_operations *gfs2_log_ops[] = {
876 &gfs2_databuf_lops,
877 &gfs2_buf_lops,
878 &gfs2_revoke_lops,
879 NULL,
880};
881
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/mempool.h>
16#include <linux/gfs2_ondisk.h>
17#include <linux/bio.h>
18#include <linux/fs.h>
19#include <linux/list_sort.h>
20
21#include "gfs2.h"
22#include "incore.h"
23#include "inode.h"
24#include "glock.h"
25#include "log.h"
26#include "lops.h"
27#include "meta_io.h"
28#include "recovery.h"
29#include "rgrp.h"
30#include "trans.h"
31#include "util.h"
32#include "trace_gfs2.h"
33
34/**
35 * gfs2_pin - Pin a buffer in memory
36 * @sdp: The superblock
37 * @bh: The buffer to be pinned
38 *
39 * The log lock must be held when calling this function
40 */
41void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh)
42{
43 struct gfs2_bufdata *bd;
44
45 BUG_ON(!current->journal_info);
46
47 clear_buffer_dirty(bh);
48 if (test_set_buffer_pinned(bh))
49 gfs2_assert_withdraw(sdp, 0);
50 if (!buffer_uptodate(bh))
51 gfs2_io_error_bh(sdp, bh);
52 bd = bh->b_private;
53 /* If this buffer is in the AIL and it has already been written
54 * to in-place disk block, remove it from the AIL.
55 */
56 spin_lock(&sdp->sd_ail_lock);
57 if (bd->bd_tr)
58 list_move(&bd->bd_ail_st_list, &bd->bd_tr->tr_ail2_list);
59 spin_unlock(&sdp->sd_ail_lock);
60 get_bh(bh);
61 atomic_inc(&sdp->sd_log_pinned);
62 trace_gfs2_pin(bd, 1);
63}
64
65static bool buffer_is_rgrp(const struct gfs2_bufdata *bd)
66{
67 return bd->bd_gl->gl_name.ln_type == LM_TYPE_RGRP;
68}
69
70static void maybe_release_space(struct gfs2_bufdata *bd)
71{
72 struct gfs2_glock *gl = bd->bd_gl;
73 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
74 struct gfs2_rgrpd *rgd = gl->gl_object;
75 unsigned int index = bd->bd_bh->b_blocknr - gl->gl_name.ln_number;
76 struct gfs2_bitmap *bi = rgd->rd_bits + index;
77
78 if (bi->bi_clone == NULL)
79 return;
80 if (sdp->sd_args.ar_discard)
81 gfs2_rgrp_send_discards(sdp, rgd->rd_data0, bd->bd_bh, bi, 1, NULL);
82 memcpy(bi->bi_clone + bi->bi_offset,
83 bd->bd_bh->b_data + bi->bi_offset, bi->bi_len);
84 clear_bit(GBF_FULL, &bi->bi_flags);
85 rgd->rd_free_clone = rgd->rd_free;
86 rgd->rd_extfail_pt = rgd->rd_free;
87}
88
89/**
90 * gfs2_unpin - Unpin a buffer
91 * @sdp: the filesystem the buffer belongs to
92 * @bh: The buffer to unpin
93 * @ai:
94 * @flags: The inode dirty flags
95 *
96 */
97
98static void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh,
99 struct gfs2_trans *tr)
100{
101 struct gfs2_bufdata *bd = bh->b_private;
102
103 BUG_ON(!buffer_uptodate(bh));
104 BUG_ON(!buffer_pinned(bh));
105
106 lock_buffer(bh);
107 mark_buffer_dirty(bh);
108 clear_buffer_pinned(bh);
109
110 if (buffer_is_rgrp(bd))
111 maybe_release_space(bd);
112
113 spin_lock(&sdp->sd_ail_lock);
114 if (bd->bd_tr) {
115 list_del(&bd->bd_ail_st_list);
116 brelse(bh);
117 } else {
118 struct gfs2_glock *gl = bd->bd_gl;
119 list_add(&bd->bd_ail_gl_list, &gl->gl_ail_list);
120 atomic_inc(&gl->gl_ail_count);
121 }
122 bd->bd_tr = tr;
123 list_add(&bd->bd_ail_st_list, &tr->tr_ail1_list);
124 spin_unlock(&sdp->sd_ail_lock);
125
126 clear_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
127 trace_gfs2_pin(bd, 0);
128 unlock_buffer(bh);
129 atomic_dec(&sdp->sd_log_pinned);
130}
131
132static void gfs2_log_incr_head(struct gfs2_sbd *sdp)
133{
134 BUG_ON((sdp->sd_log_flush_head == sdp->sd_log_tail) &&
135 (sdp->sd_log_flush_head != sdp->sd_log_head));
136
137 if (++sdp->sd_log_flush_head == sdp->sd_jdesc->jd_blocks) {
138 sdp->sd_log_flush_head = 0;
139 sdp->sd_log_flush_wrapped = 1;
140 }
141}
142
143static u64 gfs2_log_bmap(struct gfs2_sbd *sdp)
144{
145 unsigned int lbn = sdp->sd_log_flush_head;
146 struct gfs2_journal_extent *je;
147 u64 block;
148
149 list_for_each_entry(je, &sdp->sd_jdesc->extent_list, list) {
150 if ((lbn >= je->lblock) && (lbn < (je->lblock + je->blocks))) {
151 block = je->dblock + lbn - je->lblock;
152 gfs2_log_incr_head(sdp);
153 return block;
154 }
155 }
156
157 return -1;
158}
159
160/**
161 * gfs2_end_log_write_bh - end log write of pagecache data with buffers
162 * @sdp: The superblock
163 * @bvec: The bio_vec
164 * @error: The i/o status
165 *
166 * This finds the relavent buffers and unlocks then and sets the
167 * error flag according to the status of the i/o request. This is
168 * used when the log is writing data which has an in-place version
169 * that is pinned in the pagecache.
170 */
171
172static void gfs2_end_log_write_bh(struct gfs2_sbd *sdp, struct bio_vec *bvec,
173 int error)
174{
175 struct buffer_head *bh, *next;
176 struct page *page = bvec->bv_page;
177 unsigned size;
178
179 bh = page_buffers(page);
180 size = bvec->bv_len;
181 while (bh_offset(bh) < bvec->bv_offset)
182 bh = bh->b_this_page;
183 do {
184 if (error)
185 set_buffer_write_io_error(bh);
186 unlock_buffer(bh);
187 next = bh->b_this_page;
188 size -= bh->b_size;
189 brelse(bh);
190 bh = next;
191 } while(bh && size);
192}
193
194/**
195 * gfs2_end_log_write - end of i/o to the log
196 * @bio: The bio
197 * @error: Status of i/o request
198 *
199 * Each bio_vec contains either data from the pagecache or data
200 * relating to the log itself. Here we iterate over the bio_vec
201 * array, processing both kinds of data.
202 *
203 */
204
205static void gfs2_end_log_write(struct bio *bio)
206{
207 struct gfs2_sbd *sdp = bio->bi_private;
208 struct bio_vec *bvec;
209 struct page *page;
210 int i;
211
212 if (bio->bi_error) {
213 sdp->sd_log_error = bio->bi_error;
214 fs_err(sdp, "Error %d writing to log\n", bio->bi_error);
215 }
216
217 bio_for_each_segment_all(bvec, bio, i) {
218 page = bvec->bv_page;
219 if (page_has_buffers(page))
220 gfs2_end_log_write_bh(sdp, bvec, bio->bi_error);
221 else
222 mempool_free(page, gfs2_page_pool);
223 }
224
225 bio_put(bio);
226 if (atomic_dec_and_test(&sdp->sd_log_in_flight))
227 wake_up(&sdp->sd_log_flush_wait);
228}
229
230/**
231 * gfs2_log_flush_bio - Submit any pending log bio
232 * @sdp: The superblock
233 * @op: REQ_OP
234 * @op_flags: req_flag_bits
235 *
236 * Submit any pending part-built or full bio to the block device. If
237 * there is no pending bio, then this is a no-op.
238 */
239
240void gfs2_log_flush_bio(struct gfs2_sbd *sdp, int op, int op_flags)
241{
242 if (sdp->sd_log_bio) {
243 atomic_inc(&sdp->sd_log_in_flight);
244 bio_set_op_attrs(sdp->sd_log_bio, op, op_flags);
245 submit_bio(sdp->sd_log_bio);
246 sdp->sd_log_bio = NULL;
247 }
248}
249
250/**
251 * gfs2_log_alloc_bio - Allocate a new bio for log writing
252 * @sdp: The superblock
253 * @blkno: The next device block number we want to write to
254 *
255 * This should never be called when there is a cached bio in the
256 * super block. When it returns, there will be a cached bio in the
257 * super block which will have as many bio_vecs as the device is
258 * happy to handle.
259 *
260 * Returns: Newly allocated bio
261 */
262
263static struct bio *gfs2_log_alloc_bio(struct gfs2_sbd *sdp, u64 blkno)
264{
265 struct super_block *sb = sdp->sd_vfs;
266 struct bio *bio;
267
268 BUG_ON(sdp->sd_log_bio);
269
270 bio = bio_alloc(GFP_NOIO, BIO_MAX_PAGES);
271 bio->bi_iter.bi_sector = blkno * (sb->s_blocksize >> 9);
272 bio->bi_bdev = sb->s_bdev;
273 bio->bi_end_io = gfs2_end_log_write;
274 bio->bi_private = sdp;
275
276 sdp->sd_log_bio = bio;
277
278 return bio;
279}
280
281/**
282 * gfs2_log_get_bio - Get cached log bio, or allocate a new one
283 * @sdp: The superblock
284 * @blkno: The device block number we want to write to
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 not a 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{
296 struct bio *bio = sdp->sd_log_bio;
297 u64 nblk;
298
299 if (bio) {
300 nblk = bio_end_sector(bio);
301 nblk >>= sdp->sd_fsb2bb_shift;
302 if (blkno == nblk)
303 return bio;
304 gfs2_log_flush_bio(sdp, REQ_OP_WRITE, 0);
305 }
306
307 return gfs2_log_alloc_bio(sdp, blkno);
308}
309
310
311/**
312 * gfs2_log_write - write to log
313 * @sdp: the filesystem
314 * @page: the page to write
315 * @size: the size of the data to write
316 * @offset: the offset within the page
317 *
318 * Try and add the page segment to the current bio. If that fails,
319 * submit the current bio to the device and create a new one, and
320 * then add the page segment to that.
321 */
322
323static void gfs2_log_write(struct gfs2_sbd *sdp, struct page *page,
324 unsigned size, unsigned offset)
325{
326 u64 blkno = gfs2_log_bmap(sdp);
327 struct bio *bio;
328 int ret;
329
330 bio = gfs2_log_get_bio(sdp, blkno);
331 ret = bio_add_page(bio, page, size, offset);
332 if (ret == 0) {
333 gfs2_log_flush_bio(sdp, REQ_OP_WRITE, 0);
334 bio = gfs2_log_alloc_bio(sdp, blkno);
335 ret = bio_add_page(bio, page, size, offset);
336 WARN_ON(ret == 0);
337 }
338}
339
340/**
341 * gfs2_log_write_bh - write a buffer's content to the log
342 * @sdp: The super block
343 * @bh: The buffer pointing to the in-place location
344 *
345 * This writes the content of the buffer to the next available location
346 * in the log. The buffer will be unlocked once the i/o to the log has
347 * completed.
348 */
349
350static void gfs2_log_write_bh(struct gfs2_sbd *sdp, struct buffer_head *bh)
351{
352 gfs2_log_write(sdp, bh->b_page, bh->b_size, bh_offset(bh));
353}
354
355/**
356 * gfs2_log_write_page - write one block stored in a page, into the log
357 * @sdp: The superblock
358 * @page: The struct page
359 *
360 * This writes the first block-sized part of the page into the log. Note
361 * that the page must have been allocated from the gfs2_page_pool mempool
362 * and that after this has been called, ownership has been transferred and
363 * the page may be freed at any time.
364 */
365
366void gfs2_log_write_page(struct gfs2_sbd *sdp, struct page *page)
367{
368 struct super_block *sb = sdp->sd_vfs;
369 gfs2_log_write(sdp, page, sb->s_blocksize, 0);
370}
371
372static struct page *gfs2_get_log_desc(struct gfs2_sbd *sdp, u32 ld_type,
373 u32 ld_length, u32 ld_data1)
374{
375 struct page *page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
376 struct gfs2_log_descriptor *ld = page_address(page);
377 clear_page(ld);
378 ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
379 ld->ld_header.mh_type = cpu_to_be32(GFS2_METATYPE_LD);
380 ld->ld_header.mh_format = cpu_to_be32(GFS2_FORMAT_LD);
381 ld->ld_type = cpu_to_be32(ld_type);
382 ld->ld_length = cpu_to_be32(ld_length);
383 ld->ld_data1 = cpu_to_be32(ld_data1);
384 ld->ld_data2 = 0;
385 return page;
386}
387
388static void gfs2_check_magic(struct buffer_head *bh)
389{
390 void *kaddr;
391 __be32 *ptr;
392
393 clear_buffer_escaped(bh);
394 kaddr = kmap_atomic(bh->b_page);
395 ptr = kaddr + bh_offset(bh);
396 if (*ptr == cpu_to_be32(GFS2_MAGIC))
397 set_buffer_escaped(bh);
398 kunmap_atomic(kaddr);
399}
400
401static int blocknr_cmp(void *priv, struct list_head *a, struct list_head *b)
402{
403 struct gfs2_bufdata *bda, *bdb;
404
405 bda = list_entry(a, struct gfs2_bufdata, bd_list);
406 bdb = list_entry(b, struct gfs2_bufdata, bd_list);
407
408 if (bda->bd_bh->b_blocknr < bdb->bd_bh->b_blocknr)
409 return -1;
410 if (bda->bd_bh->b_blocknr > bdb->bd_bh->b_blocknr)
411 return 1;
412 return 0;
413}
414
415static void gfs2_before_commit(struct gfs2_sbd *sdp, unsigned int limit,
416 unsigned int total, struct list_head *blist,
417 bool is_databuf)
418{
419 struct gfs2_log_descriptor *ld;
420 struct gfs2_bufdata *bd1 = NULL, *bd2;
421 struct page *page;
422 unsigned int num;
423 unsigned n;
424 __be64 *ptr;
425
426 gfs2_log_lock(sdp);
427 list_sort(NULL, blist, blocknr_cmp);
428 bd1 = bd2 = list_prepare_entry(bd1, blist, bd_list);
429 while(total) {
430 num = total;
431 if (total > limit)
432 num = limit;
433 gfs2_log_unlock(sdp);
434 page = gfs2_get_log_desc(sdp,
435 is_databuf ? GFS2_LOG_DESC_JDATA :
436 GFS2_LOG_DESC_METADATA, num + 1, num);
437 ld = page_address(page);
438 gfs2_log_lock(sdp);
439 ptr = (__be64 *)(ld + 1);
440
441 n = 0;
442 list_for_each_entry_continue(bd1, blist, bd_list) {
443 *ptr++ = cpu_to_be64(bd1->bd_bh->b_blocknr);
444 if (is_databuf) {
445 gfs2_check_magic(bd1->bd_bh);
446 *ptr++ = cpu_to_be64(buffer_escaped(bd1->bd_bh) ? 1 : 0);
447 }
448 if (++n >= num)
449 break;
450 }
451
452 gfs2_log_unlock(sdp);
453 gfs2_log_write_page(sdp, page);
454 gfs2_log_lock(sdp);
455
456 n = 0;
457 list_for_each_entry_continue(bd2, blist, bd_list) {
458 get_bh(bd2->bd_bh);
459 gfs2_log_unlock(sdp);
460 lock_buffer(bd2->bd_bh);
461
462 if (buffer_escaped(bd2->bd_bh)) {
463 void *kaddr;
464 page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
465 ptr = page_address(page);
466 kaddr = kmap_atomic(bd2->bd_bh->b_page);
467 memcpy(ptr, kaddr + bh_offset(bd2->bd_bh),
468 bd2->bd_bh->b_size);
469 kunmap_atomic(kaddr);
470 *(__be32 *)ptr = 0;
471 clear_buffer_escaped(bd2->bd_bh);
472 unlock_buffer(bd2->bd_bh);
473 brelse(bd2->bd_bh);
474 gfs2_log_write_page(sdp, page);
475 } else {
476 gfs2_log_write_bh(sdp, bd2->bd_bh);
477 }
478 gfs2_log_lock(sdp);
479 if (++n >= num)
480 break;
481 }
482
483 BUG_ON(total < num);
484 total -= num;
485 }
486 gfs2_log_unlock(sdp);
487}
488
489static void buf_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
490{
491 unsigned int limit = buf_limit(sdp); /* 503 for 4k blocks */
492 unsigned int nbuf;
493 if (tr == NULL)
494 return;
495 nbuf = tr->tr_num_buf_new - tr->tr_num_buf_rm;
496 gfs2_before_commit(sdp, limit, nbuf, &tr->tr_buf, 0);
497}
498
499static void buf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
500{
501 struct list_head *head;
502 struct gfs2_bufdata *bd;
503
504 if (tr == NULL)
505 return;
506
507 head = &tr->tr_buf;
508 while (!list_empty(head)) {
509 bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
510 list_del_init(&bd->bd_list);
511 gfs2_unpin(sdp, bd->bd_bh, tr);
512 }
513}
514
515static void buf_lo_before_scan(struct gfs2_jdesc *jd,
516 struct gfs2_log_header_host *head, int pass)
517{
518 if (pass != 0)
519 return;
520
521 jd->jd_found_blocks = 0;
522 jd->jd_replayed_blocks = 0;
523}
524
525static int buf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
526 struct gfs2_log_descriptor *ld, __be64 *ptr,
527 int pass)
528{
529 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
530 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
531 struct gfs2_glock *gl = ip->i_gl;
532 unsigned int blks = be32_to_cpu(ld->ld_data1);
533 struct buffer_head *bh_log, *bh_ip;
534 u64 blkno;
535 int error = 0;
536
537 if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_METADATA)
538 return 0;
539
540 gfs2_replay_incr_blk(jd, &start);
541
542 for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) {
543 blkno = be64_to_cpu(*ptr++);
544
545 jd->jd_found_blocks++;
546
547 if (gfs2_revoke_check(jd, blkno, start))
548 continue;
549
550 error = gfs2_replay_read_block(jd, start, &bh_log);
551 if (error)
552 return error;
553
554 bh_ip = gfs2_meta_new(gl, blkno);
555 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
556
557 if (gfs2_meta_check(sdp, bh_ip))
558 error = -EIO;
559 else
560 mark_buffer_dirty(bh_ip);
561
562 brelse(bh_log);
563 brelse(bh_ip);
564
565 if (error)
566 break;
567
568 jd->jd_replayed_blocks++;
569 }
570
571 return error;
572}
573
574/**
575 * gfs2_meta_sync - Sync all buffers associated with a glock
576 * @gl: The glock
577 *
578 */
579
580static void gfs2_meta_sync(struct gfs2_glock *gl)
581{
582 struct address_space *mapping = gfs2_glock2aspace(gl);
583 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
584 int error;
585
586 if (mapping == NULL)
587 mapping = &sdp->sd_aspace;
588
589 filemap_fdatawrite(mapping);
590 error = filemap_fdatawait(mapping);
591
592 if (error)
593 gfs2_io_error(gl->gl_name.ln_sbd);
594}
595
596static void buf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
597{
598 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
599 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
600
601 if (error) {
602 gfs2_meta_sync(ip->i_gl);
603 return;
604 }
605 if (pass != 1)
606 return;
607
608 gfs2_meta_sync(ip->i_gl);
609
610 fs_info(sdp, "jid=%u: Replayed %u of %u blocks\n",
611 jd->jd_jid, jd->jd_replayed_blocks, jd->jd_found_blocks);
612}
613
614static void revoke_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
615{
616 struct gfs2_meta_header *mh;
617 unsigned int offset;
618 struct list_head *head = &sdp->sd_log_le_revoke;
619 struct gfs2_bufdata *bd;
620 struct page *page;
621 unsigned int length;
622
623 gfs2_write_revokes(sdp);
624 if (!sdp->sd_log_num_revoke)
625 return;
626
627 length = gfs2_struct2blk(sdp, sdp->sd_log_num_revoke, sizeof(u64));
628 page = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_REVOKE, length, sdp->sd_log_num_revoke);
629 offset = sizeof(struct gfs2_log_descriptor);
630
631 list_for_each_entry(bd, head, bd_list) {
632 sdp->sd_log_num_revoke--;
633
634 if (offset + sizeof(u64) > sdp->sd_sb.sb_bsize) {
635
636 gfs2_log_write_page(sdp, page);
637 page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
638 mh = page_address(page);
639 clear_page(mh);
640 mh->mh_magic = cpu_to_be32(GFS2_MAGIC);
641 mh->mh_type = cpu_to_be32(GFS2_METATYPE_LB);
642 mh->mh_format = cpu_to_be32(GFS2_FORMAT_LB);
643 offset = sizeof(struct gfs2_meta_header);
644 }
645
646 *(__be64 *)(page_address(page) + offset) = cpu_to_be64(bd->bd_blkno);
647 offset += sizeof(u64);
648 }
649 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
650
651 gfs2_log_write_page(sdp, page);
652}
653
654static void revoke_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
655{
656 struct list_head *head = &sdp->sd_log_le_revoke;
657 struct gfs2_bufdata *bd;
658 struct gfs2_glock *gl;
659
660 while (!list_empty(head)) {
661 bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
662 list_del_init(&bd->bd_list);
663 gl = bd->bd_gl;
664 atomic_dec(&gl->gl_revokes);
665 clear_bit(GLF_LFLUSH, &gl->gl_flags);
666 kmem_cache_free(gfs2_bufdata_cachep, bd);
667 }
668}
669
670static void revoke_lo_before_scan(struct gfs2_jdesc *jd,
671 struct gfs2_log_header_host *head, int pass)
672{
673 if (pass != 0)
674 return;
675
676 jd->jd_found_revokes = 0;
677 jd->jd_replay_tail = head->lh_tail;
678}
679
680static int revoke_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
681 struct gfs2_log_descriptor *ld, __be64 *ptr,
682 int pass)
683{
684 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
685 unsigned int blks = be32_to_cpu(ld->ld_length);
686 unsigned int revokes = be32_to_cpu(ld->ld_data1);
687 struct buffer_head *bh;
688 unsigned int offset;
689 u64 blkno;
690 int first = 1;
691 int error;
692
693 if (pass != 0 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_REVOKE)
694 return 0;
695
696 offset = sizeof(struct gfs2_log_descriptor);
697
698 for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) {
699 error = gfs2_replay_read_block(jd, start, &bh);
700 if (error)
701 return error;
702
703 if (!first)
704 gfs2_metatype_check(sdp, bh, GFS2_METATYPE_LB);
705
706 while (offset + sizeof(u64) <= sdp->sd_sb.sb_bsize) {
707 blkno = be64_to_cpu(*(__be64 *)(bh->b_data + offset));
708
709 error = gfs2_revoke_add(jd, blkno, start);
710 if (error < 0) {
711 brelse(bh);
712 return error;
713 }
714 else if (error)
715 jd->jd_found_revokes++;
716
717 if (!--revokes)
718 break;
719 offset += sizeof(u64);
720 }
721
722 brelse(bh);
723 offset = sizeof(struct gfs2_meta_header);
724 first = 0;
725 }
726
727 return 0;
728}
729
730static void revoke_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
731{
732 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
733
734 if (error) {
735 gfs2_revoke_clean(jd);
736 return;
737 }
738 if (pass != 1)
739 return;
740
741 fs_info(sdp, "jid=%u: Found %u revoke tags\n",
742 jd->jd_jid, jd->jd_found_revokes);
743
744 gfs2_revoke_clean(jd);
745}
746
747/**
748 * databuf_lo_before_commit - Scan the data buffers, writing as we go
749 *
750 */
751
752static void databuf_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
753{
754 unsigned int limit = databuf_limit(sdp);
755 unsigned int nbuf;
756 if (tr == NULL)
757 return;
758 nbuf = tr->tr_num_databuf_new - tr->tr_num_databuf_rm;
759 gfs2_before_commit(sdp, limit, nbuf, &tr->tr_databuf, 1);
760}
761
762static int databuf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
763 struct gfs2_log_descriptor *ld,
764 __be64 *ptr, int pass)
765{
766 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
767 struct gfs2_glock *gl = ip->i_gl;
768 unsigned int blks = be32_to_cpu(ld->ld_data1);
769 struct buffer_head *bh_log, *bh_ip;
770 u64 blkno;
771 u64 esc;
772 int error = 0;
773
774 if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_JDATA)
775 return 0;
776
777 gfs2_replay_incr_blk(jd, &start);
778 for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) {
779 blkno = be64_to_cpu(*ptr++);
780 esc = be64_to_cpu(*ptr++);
781
782 jd->jd_found_blocks++;
783
784 if (gfs2_revoke_check(jd, blkno, start))
785 continue;
786
787 error = gfs2_replay_read_block(jd, start, &bh_log);
788 if (error)
789 return error;
790
791 bh_ip = gfs2_meta_new(gl, blkno);
792 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
793
794 /* Unescape */
795 if (esc) {
796 __be32 *eptr = (__be32 *)bh_ip->b_data;
797 *eptr = cpu_to_be32(GFS2_MAGIC);
798 }
799 mark_buffer_dirty(bh_ip);
800
801 brelse(bh_log);
802 brelse(bh_ip);
803
804 jd->jd_replayed_blocks++;
805 }
806
807 return error;
808}
809
810/* FIXME: sort out accounting for log blocks etc. */
811
812static void databuf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
813{
814 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
815 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
816
817 if (error) {
818 gfs2_meta_sync(ip->i_gl);
819 return;
820 }
821 if (pass != 1)
822 return;
823
824 /* data sync? */
825 gfs2_meta_sync(ip->i_gl);
826
827 fs_info(sdp, "jid=%u: Replayed %u of %u data blocks\n",
828 jd->jd_jid, jd->jd_replayed_blocks, jd->jd_found_blocks);
829}
830
831static void databuf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
832{
833 struct list_head *head;
834 struct gfs2_bufdata *bd;
835
836 if (tr == NULL)
837 return;
838
839 head = &tr->tr_databuf;
840 while (!list_empty(head)) {
841 bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
842 list_del_init(&bd->bd_list);
843 gfs2_unpin(sdp, bd->bd_bh, tr);
844 }
845}
846
847
848const struct gfs2_log_operations gfs2_buf_lops = {
849 .lo_before_commit = buf_lo_before_commit,
850 .lo_after_commit = buf_lo_after_commit,
851 .lo_before_scan = buf_lo_before_scan,
852 .lo_scan_elements = buf_lo_scan_elements,
853 .lo_after_scan = buf_lo_after_scan,
854 .lo_name = "buf",
855};
856
857const struct gfs2_log_operations gfs2_revoke_lops = {
858 .lo_before_commit = revoke_lo_before_commit,
859 .lo_after_commit = revoke_lo_after_commit,
860 .lo_before_scan = revoke_lo_before_scan,
861 .lo_scan_elements = revoke_lo_scan_elements,
862 .lo_after_scan = revoke_lo_after_scan,
863 .lo_name = "revoke",
864};
865
866const struct gfs2_log_operations gfs2_databuf_lops = {
867 .lo_before_commit = databuf_lo_before_commit,
868 .lo_after_commit = databuf_lo_after_commit,
869 .lo_scan_elements = databuf_lo_scan_elements,
870 .lo_after_scan = databuf_lo_after_scan,
871 .lo_name = "databuf",
872};
873
874const struct gfs2_log_operations *gfs2_log_ops[] = {
875 &gfs2_databuf_lops,
876 &gfs2_buf_lops,
877 &gfs2_revoke_lops,
878 NULL,
879};
880