2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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.
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>
19 #include <linux/list_sort.h>
33 #include "trace_gfs2.h"
36 * gfs2_pin - Pin a buffer in memory
37 * @sdp: The superblock
38 * @bh: The buffer to be pinned
40 * The log lock must be held when calling this function
42 void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh)
44 struct gfs2_bufdata *bd;
46 BUG_ON(!current->journal_info);
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);
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.
57 spin_lock(&sdp->sd_ail_lock);
59 list_move(&bd->bd_ail_st_list, &bd->bd_tr->tr_ail2_list);
60 spin_unlock(&sdp->sd_ail_lock);
62 atomic_inc(&sdp->sd_log_pinned);
63 trace_gfs2_pin(bd, 1);
66 static bool buffer_is_rgrp(const struct gfs2_bufdata *bd)
68 return bd->bd_gl->gl_name.ln_type == LM_TYPE_RGRP;
71 static void maybe_release_space(struct gfs2_bufdata *bd)
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;
79 if (bi->bi_clone == NULL)
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_bytes);
85 clear_bit(GBF_FULL, &bi->bi_flags);
86 rgd->rd_free_clone = rgd->rd_free;
87 rgd->rd_extfail_pt = rgd->rd_free;
91 * gfs2_unpin - Unpin a buffer
92 * @sdp: the filesystem the buffer belongs to
93 * @bh: The buffer to unpin
95 * @flags: The inode dirty flags
99 static void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh,
100 struct gfs2_trans *tr)
102 struct gfs2_bufdata *bd = bh->b_private;
104 BUG_ON(!buffer_uptodate(bh));
105 BUG_ON(!buffer_pinned(bh));
108 mark_buffer_dirty(bh);
109 clear_buffer_pinned(bh);
111 if (buffer_is_rgrp(bd))
112 maybe_release_space(bd);
114 spin_lock(&sdp->sd_ail_lock);
116 list_del(&bd->bd_ail_st_list);
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);
124 list_add(&bd->bd_ail_st_list, &tr->tr_ail1_list);
125 spin_unlock(&sdp->sd_ail_lock);
127 clear_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
128 trace_gfs2_pin(bd, 0);
130 atomic_dec(&sdp->sd_log_pinned);
133 static void gfs2_log_incr_head(struct gfs2_sbd *sdp)
135 BUG_ON((sdp->sd_log_flush_head == sdp->sd_log_tail) &&
136 (sdp->sd_log_flush_head != sdp->sd_log_head));
138 if (++sdp->sd_log_flush_head == sdp->sd_jdesc->jd_blocks)
139 sdp->sd_log_flush_head = 0;
142 u64 gfs2_log_bmap(struct gfs2_sbd *sdp)
144 unsigned int lbn = sdp->sd_log_flush_head;
145 struct gfs2_journal_extent *je;
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);
160 * gfs2_end_log_write_bh - end log write of pagecache data with buffers
161 * @sdp: The superblock
163 * @error: The i/o status
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.
171 static void gfs2_end_log_write_bh(struct gfs2_sbd *sdp, struct bio_vec *bvec,
174 struct buffer_head *bh, *next;
175 struct page *page = bvec->bv_page;
178 bh = page_buffers(page);
180 while (bh_offset(bh) < bvec->bv_offset)
181 bh = bh->b_this_page;
184 mark_buffer_write_io_error(bh);
186 next = bh->b_this_page;
194 * gfs2_end_log_write - end of i/o to the log
196 * @error: Status of i/o request
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.
204 static void gfs2_end_log_write(struct bio *bio)
206 struct gfs2_sbd *sdp = bio->bi_private;
207 struct bio_vec *bvec;
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);
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);
222 mempool_free(page, gfs2_page_pool);
226 if (atomic_dec_and_test(&sdp->sd_log_in_flight))
227 wake_up(&sdp->sd_log_flush_wait);
231 * gfs2_log_submit_bio - Submit any pending log bio
232 * @biop: Address of the bio pointer
234 * @op_flags: req_flag_bits
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.
240 void gfs2_log_submit_bio(struct bio **biop, int op, int op_flags)
242 struct bio *bio = *biop;
244 struct gfs2_sbd *sdp = bio->bi_private;
245 atomic_inc(&sdp->sd_log_in_flight);
246 bio_set_op_attrs(bio, op, op_flags);
253 * gfs2_log_alloc_bio - Allocate a bio
254 * @sdp: The super block
255 * @blkno: The device block number we want to write to
256 * @end_io: The bi_end_io callback
258 * Allocate a new bio, initialize it with the given parameters and return it.
260 * Returns: The newly allocated bio
263 static struct bio *gfs2_log_alloc_bio(struct gfs2_sbd *sdp, u64 blkno,
264 bio_end_io_t *end_io)
266 struct super_block *sb = sdp->sd_vfs;
267 struct bio *bio = bio_alloc(GFP_NOIO, BIO_MAX_PAGES);
269 bio->bi_iter.bi_sector = blkno * (sb->s_blocksize >> 9);
270 bio_set_dev(bio, sb->s_bdev);
271 bio->bi_end_io = end_io;
272 bio->bi_private = sdp;
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 * @bio: The bio to get or allocate
283 * @end_io: The bi_end_io callback
284 * @flush: Always flush the current bio and allocate a new one?
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.
291 * Returns: The bio to use for log writes
294 static struct bio *gfs2_log_get_bio(struct gfs2_sbd *sdp, u64 blkno,
295 struct bio **biop, int op,
296 bio_end_io_t *end_io, bool flush)
298 struct bio *bio = *biop;
303 nblk = bio_end_sector(bio);
304 nblk >>= sdp->sd_fsb2bb_shift;
305 if (blkno == nblk && !flush)
307 gfs2_log_submit_bio(biop, op, 0);
310 *biop = gfs2_log_alloc_bio(sdp, blkno, end_io);
315 * gfs2_log_write - write to log
316 * @sdp: the filesystem
317 * @page: the page to write
318 * @size: the size of the data to write
319 * @offset: the offset within the page
320 * @blkno: block number of the log entry
322 * Try and add the page segment to the current bio. If that fails,
323 * submit the current bio to the device and create a new one, and
324 * then add the page segment to that.
327 void gfs2_log_write(struct gfs2_sbd *sdp, struct page *page,
328 unsigned size, unsigned offset, u64 blkno)
333 bio = gfs2_log_get_bio(sdp, blkno, &sdp->sd_log_bio, REQ_OP_WRITE,
334 gfs2_end_log_write, false);
335 ret = bio_add_page(bio, page, size, offset);
337 bio = gfs2_log_get_bio(sdp, blkno, &sdp->sd_log_bio,
338 REQ_OP_WRITE, gfs2_end_log_write, true);
339 ret = bio_add_page(bio, page, size, offset);
345 * gfs2_log_write_bh - write a buffer's content to the log
346 * @sdp: The super block
347 * @bh: The buffer pointing to the in-place location
349 * This writes the content of the buffer to the next available location
350 * in the log. The buffer will be unlocked once the i/o to the log has
354 static void gfs2_log_write_bh(struct gfs2_sbd *sdp, struct buffer_head *bh)
356 gfs2_log_write(sdp, bh->b_page, bh->b_size, bh_offset(bh),
361 * gfs2_log_write_page - write one block stored in a page, into the log
362 * @sdp: The superblock
363 * @page: The struct page
365 * This writes the first block-sized part of the page into the log. Note
366 * that the page must have been allocated from the gfs2_page_pool mempool
367 * and that after this has been called, ownership has been transferred and
368 * the page may be freed at any time.
371 void gfs2_log_write_page(struct gfs2_sbd *sdp, struct page *page)
373 struct super_block *sb = sdp->sd_vfs;
374 gfs2_log_write(sdp, page, sb->s_blocksize, 0,
378 static struct page *gfs2_get_log_desc(struct gfs2_sbd *sdp, u32 ld_type,
379 u32 ld_length, u32 ld_data1)
381 struct page *page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
382 struct gfs2_log_descriptor *ld = page_address(page);
384 ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
385 ld->ld_header.mh_type = cpu_to_be32(GFS2_METATYPE_LD);
386 ld->ld_header.mh_format = cpu_to_be32(GFS2_FORMAT_LD);
387 ld->ld_type = cpu_to_be32(ld_type);
388 ld->ld_length = cpu_to_be32(ld_length);
389 ld->ld_data1 = cpu_to_be32(ld_data1);
394 static void gfs2_check_magic(struct buffer_head *bh)
399 clear_buffer_escaped(bh);
400 kaddr = kmap_atomic(bh->b_page);
401 ptr = kaddr + bh_offset(bh);
402 if (*ptr == cpu_to_be32(GFS2_MAGIC))
403 set_buffer_escaped(bh);
404 kunmap_atomic(kaddr);
407 static int blocknr_cmp(void *priv, struct list_head *a, struct list_head *b)
409 struct gfs2_bufdata *bda, *bdb;
411 bda = list_entry(a, struct gfs2_bufdata, bd_list);
412 bdb = list_entry(b, struct gfs2_bufdata, bd_list);
414 if (bda->bd_bh->b_blocknr < bdb->bd_bh->b_blocknr)
416 if (bda->bd_bh->b_blocknr > bdb->bd_bh->b_blocknr)
421 static void gfs2_before_commit(struct gfs2_sbd *sdp, unsigned int limit,
422 unsigned int total, struct list_head *blist,
425 struct gfs2_log_descriptor *ld;
426 struct gfs2_bufdata *bd1 = NULL, *bd2;
433 list_sort(NULL, blist, blocknr_cmp);
434 bd1 = bd2 = list_prepare_entry(bd1, blist, bd_list);
439 gfs2_log_unlock(sdp);
440 page = gfs2_get_log_desc(sdp,
441 is_databuf ? GFS2_LOG_DESC_JDATA :
442 GFS2_LOG_DESC_METADATA, num + 1, num);
443 ld = page_address(page);
445 ptr = (__be64 *)(ld + 1);
448 list_for_each_entry_continue(bd1, blist, bd_list) {
449 *ptr++ = cpu_to_be64(bd1->bd_bh->b_blocknr);
451 gfs2_check_magic(bd1->bd_bh);
452 *ptr++ = cpu_to_be64(buffer_escaped(bd1->bd_bh) ? 1 : 0);
458 gfs2_log_unlock(sdp);
459 gfs2_log_write_page(sdp, page);
463 list_for_each_entry_continue(bd2, blist, bd_list) {
465 gfs2_log_unlock(sdp);
466 lock_buffer(bd2->bd_bh);
468 if (buffer_escaped(bd2->bd_bh)) {
470 page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
471 ptr = page_address(page);
472 kaddr = kmap_atomic(bd2->bd_bh->b_page);
473 memcpy(ptr, kaddr + bh_offset(bd2->bd_bh),
475 kunmap_atomic(kaddr);
477 clear_buffer_escaped(bd2->bd_bh);
478 unlock_buffer(bd2->bd_bh);
480 gfs2_log_write_page(sdp, page);
482 gfs2_log_write_bh(sdp, bd2->bd_bh);
492 gfs2_log_unlock(sdp);
495 static void buf_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
497 unsigned int limit = buf_limit(sdp); /* 503 for 4k blocks */
501 nbuf = tr->tr_num_buf_new - tr->tr_num_buf_rm;
502 gfs2_before_commit(sdp, limit, nbuf, &tr->tr_buf, 0);
505 static void buf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
507 struct list_head *head;
508 struct gfs2_bufdata *bd;
514 while (!list_empty(head)) {
515 bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
516 list_del_init(&bd->bd_list);
517 gfs2_unpin(sdp, bd->bd_bh, tr);
521 static void buf_lo_before_scan(struct gfs2_jdesc *jd,
522 struct gfs2_log_header_host *head, int pass)
527 jd->jd_found_blocks = 0;
528 jd->jd_replayed_blocks = 0;
531 static int buf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
532 struct gfs2_log_descriptor *ld, __be64 *ptr,
535 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
536 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
537 struct gfs2_glock *gl = ip->i_gl;
538 unsigned int blks = be32_to_cpu(ld->ld_data1);
539 struct buffer_head *bh_log, *bh_ip;
543 if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_METADATA)
546 gfs2_replay_incr_blk(jd, &start);
548 for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) {
549 blkno = be64_to_cpu(*ptr++);
551 jd->jd_found_blocks++;
553 if (gfs2_revoke_check(jd, blkno, start))
556 error = gfs2_replay_read_block(jd, start, &bh_log);
560 bh_ip = gfs2_meta_new(gl, blkno);
561 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
563 if (gfs2_meta_check(sdp, bh_ip))
566 mark_buffer_dirty(bh_ip);
574 jd->jd_replayed_blocks++;
581 * gfs2_meta_sync - Sync all buffers associated with a glock
586 static void gfs2_meta_sync(struct gfs2_glock *gl)
588 struct address_space *mapping = gfs2_glock2aspace(gl);
589 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
593 mapping = &sdp->sd_aspace;
595 filemap_fdatawrite(mapping);
596 error = filemap_fdatawait(mapping);
599 gfs2_io_error(gl->gl_name.ln_sbd);
602 static void buf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
604 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
605 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
608 gfs2_meta_sync(ip->i_gl);
614 gfs2_meta_sync(ip->i_gl);
616 fs_info(sdp, "jid=%u: Replayed %u of %u blocks\n",
617 jd->jd_jid, jd->jd_replayed_blocks, jd->jd_found_blocks);
620 static void revoke_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
622 struct gfs2_meta_header *mh;
624 struct list_head *head = &sdp->sd_log_le_revoke;
625 struct gfs2_bufdata *bd;
629 gfs2_write_revokes(sdp);
630 if (!sdp->sd_log_num_revoke)
633 length = gfs2_struct2blk(sdp, sdp->sd_log_num_revoke, sizeof(u64));
634 page = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_REVOKE, length, sdp->sd_log_num_revoke);
635 offset = sizeof(struct gfs2_log_descriptor);
637 list_for_each_entry(bd, head, bd_list) {
638 sdp->sd_log_num_revoke--;
640 if (offset + sizeof(u64) > sdp->sd_sb.sb_bsize) {
642 gfs2_log_write_page(sdp, page);
643 page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
644 mh = page_address(page);
646 mh->mh_magic = cpu_to_be32(GFS2_MAGIC);
647 mh->mh_type = cpu_to_be32(GFS2_METATYPE_LB);
648 mh->mh_format = cpu_to_be32(GFS2_FORMAT_LB);
649 offset = sizeof(struct gfs2_meta_header);
652 *(__be64 *)(page_address(page) + offset) = cpu_to_be64(bd->bd_blkno);
653 offset += sizeof(u64);
655 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
657 gfs2_log_write_page(sdp, page);
660 static void revoke_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
662 struct list_head *head = &sdp->sd_log_le_revoke;
663 struct gfs2_bufdata *bd;
664 struct gfs2_glock *gl;
666 while (!list_empty(head)) {
667 bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
668 list_del_init(&bd->bd_list);
670 atomic_dec(&gl->gl_revokes);
671 clear_bit(GLF_LFLUSH, &gl->gl_flags);
672 kmem_cache_free(gfs2_bufdata_cachep, bd);
676 static void revoke_lo_before_scan(struct gfs2_jdesc *jd,
677 struct gfs2_log_header_host *head, int pass)
682 jd->jd_found_revokes = 0;
683 jd->jd_replay_tail = head->lh_tail;
686 static int revoke_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
687 struct gfs2_log_descriptor *ld, __be64 *ptr,
690 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
691 unsigned int blks = be32_to_cpu(ld->ld_length);
692 unsigned int revokes = be32_to_cpu(ld->ld_data1);
693 struct buffer_head *bh;
699 if (pass != 0 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_REVOKE)
702 offset = sizeof(struct gfs2_log_descriptor);
704 for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) {
705 error = gfs2_replay_read_block(jd, start, &bh);
710 gfs2_metatype_check(sdp, bh, GFS2_METATYPE_LB);
712 while (offset + sizeof(u64) <= sdp->sd_sb.sb_bsize) {
713 blkno = be64_to_cpu(*(__be64 *)(bh->b_data + offset));
715 error = gfs2_revoke_add(jd, blkno, start);
721 jd->jd_found_revokes++;
725 offset += sizeof(u64);
729 offset = sizeof(struct gfs2_meta_header);
736 static void revoke_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
738 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
741 gfs2_revoke_clean(jd);
747 fs_info(sdp, "jid=%u: Found %u revoke tags\n",
748 jd->jd_jid, jd->jd_found_revokes);
750 gfs2_revoke_clean(jd);
754 * databuf_lo_before_commit - Scan the data buffers, writing as we go
758 static void databuf_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
760 unsigned int limit = databuf_limit(sdp);
764 nbuf = tr->tr_num_databuf_new - tr->tr_num_databuf_rm;
765 gfs2_before_commit(sdp, limit, nbuf, &tr->tr_databuf, 1);
768 static int databuf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
769 struct gfs2_log_descriptor *ld,
770 __be64 *ptr, int pass)
772 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
773 struct gfs2_glock *gl = ip->i_gl;
774 unsigned int blks = be32_to_cpu(ld->ld_data1);
775 struct buffer_head *bh_log, *bh_ip;
780 if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_JDATA)
783 gfs2_replay_incr_blk(jd, &start);
784 for (; blks; gfs2_replay_incr_blk(jd, &start), blks--) {
785 blkno = be64_to_cpu(*ptr++);
786 esc = be64_to_cpu(*ptr++);
788 jd->jd_found_blocks++;
790 if (gfs2_revoke_check(jd, blkno, start))
793 error = gfs2_replay_read_block(jd, start, &bh_log);
797 bh_ip = gfs2_meta_new(gl, blkno);
798 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
802 __be32 *eptr = (__be32 *)bh_ip->b_data;
803 *eptr = cpu_to_be32(GFS2_MAGIC);
805 mark_buffer_dirty(bh_ip);
810 jd->jd_replayed_blocks++;
816 /* FIXME: sort out accounting for log blocks etc. */
818 static void databuf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
820 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
821 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
824 gfs2_meta_sync(ip->i_gl);
831 gfs2_meta_sync(ip->i_gl);
833 fs_info(sdp, "jid=%u: Replayed %u of %u data blocks\n",
834 jd->jd_jid, jd->jd_replayed_blocks, jd->jd_found_blocks);
837 static void databuf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
839 struct list_head *head;
840 struct gfs2_bufdata *bd;
845 head = &tr->tr_databuf;
846 while (!list_empty(head)) {
847 bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
848 list_del_init(&bd->bd_list);
849 gfs2_unpin(sdp, bd->bd_bh, tr);
854 const struct gfs2_log_operations gfs2_buf_lops = {
855 .lo_before_commit = buf_lo_before_commit,
856 .lo_after_commit = buf_lo_after_commit,
857 .lo_before_scan = buf_lo_before_scan,
858 .lo_scan_elements = buf_lo_scan_elements,
859 .lo_after_scan = buf_lo_after_scan,
863 const struct gfs2_log_operations gfs2_revoke_lops = {
864 .lo_before_commit = revoke_lo_before_commit,
865 .lo_after_commit = revoke_lo_after_commit,
866 .lo_before_scan = revoke_lo_before_scan,
867 .lo_scan_elements = revoke_lo_scan_elements,
868 .lo_after_scan = revoke_lo_after_scan,
872 const struct gfs2_log_operations gfs2_databuf_lops = {
873 .lo_before_commit = databuf_lo_before_commit,
874 .lo_after_commit = databuf_lo_after_commit,
875 .lo_scan_elements = databuf_lo_scan_elements,
876 .lo_after_scan = databuf_lo_after_scan,
877 .lo_name = "databuf",
880 const struct gfs2_log_operations *gfs2_log_ops[] = {