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/gfs2_ondisk.h>
16 #include <linux/lm_interface.h>
31 * gfs2_pin - Pin a buffer in memory
32 * @sdp: The superblock
33 * @bh: The buffer to be pinned
35 * The log lock must be held when calling this function
37 static void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh)
39 struct gfs2_bufdata *bd;
41 gfs2_assert_withdraw(sdp, test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags));
43 clear_buffer_dirty(bh);
44 if (test_set_buffer_pinned(bh))
45 gfs2_assert_withdraw(sdp, 0);
46 if (!buffer_uptodate(bh))
47 gfs2_io_error_bh(sdp, bh);
49 /* If this buffer is in the AIL and it has already been written
50 * to in-place disk block, remove it from the AIL.
53 list_move(&bd->bd_ail_st_list, &bd->bd_ail->ai_ail2_list);
58 * gfs2_unpin - Unpin a buffer
59 * @sdp: the filesystem the buffer belongs to
60 * @bh: The buffer to unpin
65 static void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh,
68 struct gfs2_bufdata *bd = bh->b_private;
70 gfs2_assert_withdraw(sdp, buffer_uptodate(bh));
72 if (!buffer_pinned(bh))
73 gfs2_assert_withdraw(sdp, 0);
76 mark_buffer_dirty(bh);
77 clear_buffer_pinned(bh);
81 list_del(&bd->bd_ail_st_list);
84 struct gfs2_glock *gl = bd->bd_gl;
85 list_add(&bd->bd_ail_gl_list, &gl->gl_ail_list);
86 atomic_inc(&gl->gl_ail_count);
89 list_add(&bd->bd_ail_st_list, &ai->ai_ail1_list);
95 static inline struct gfs2_log_descriptor *bh_log_desc(struct buffer_head *bh)
97 return (struct gfs2_log_descriptor *)bh->b_data;
100 static inline __be64 *bh_log_ptr(struct buffer_head *bh)
102 struct gfs2_log_descriptor *ld = bh_log_desc(bh);
103 return (__force __be64 *)(ld + 1);
106 static inline __be64 *bh_ptr_end(struct buffer_head *bh)
108 return (__force __be64 *)(bh->b_data + bh->b_size);
112 static struct buffer_head *gfs2_get_log_desc(struct gfs2_sbd *sdp, u32 ld_type)
114 struct buffer_head *bh = gfs2_log_get_buf(sdp);
115 struct gfs2_log_descriptor *ld = bh_log_desc(bh);
116 ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
117 ld->ld_header.mh_type = cpu_to_be32(GFS2_METATYPE_LD);
118 ld->ld_header.mh_format = cpu_to_be32(GFS2_FORMAT_LD);
119 ld->ld_type = cpu_to_be32(ld_type);
123 memset(ld->ld_reserved, 0, sizeof(ld->ld_reserved));
127 static void __glock_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
129 struct gfs2_glock *gl;
130 struct gfs2_trans *tr = current->journal_info;
134 gl = container_of(le, struct gfs2_glock, gl_le);
135 if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(gl)))
138 if (!list_empty(&le->le_list))
142 set_bit(GLF_DIRTY, &gl->gl_flags);
143 sdp->sd_log_num_gl++;
144 list_add(&le->le_list, &sdp->sd_log_le_gl);
147 static void glock_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
150 __glock_lo_add(sdp, le);
151 gfs2_log_unlock(sdp);
154 static void glock_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
156 struct list_head *head = &sdp->sd_log_le_gl;
157 struct gfs2_glock *gl;
159 while (!list_empty(head)) {
160 gl = list_entry(head->next, struct gfs2_glock, gl_le.le_list);
161 list_del_init(&gl->gl_le.le_list);
162 sdp->sd_log_num_gl--;
164 gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(gl));
167 gfs2_assert_warn(sdp, !sdp->sd_log_num_gl);
170 static void buf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
172 struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
173 struct gfs2_trans *tr;
175 lock_buffer(bd->bd_bh);
177 if (!list_empty(&bd->bd_list_tr))
179 tr = current->journal_info;
182 list_add(&bd->bd_list_tr, &tr->tr_list_buf);
183 if (!list_empty(&le->le_list))
185 __glock_lo_add(sdp, &bd->bd_gl->gl_le);
186 gfs2_meta_check(sdp, bd->bd_bh);
187 gfs2_pin(sdp, bd->bd_bh);
188 sdp->sd_log_num_buf++;
189 list_add(&le->le_list, &sdp->sd_log_le_buf);
190 tr->tr_num_buf_new++;
192 gfs2_log_unlock(sdp);
193 unlock_buffer(bd->bd_bh);
196 static void buf_lo_incore_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
198 struct list_head *head = &tr->tr_list_buf;
199 struct gfs2_bufdata *bd;
202 while (!list_empty(head)) {
203 bd = list_entry(head->next, struct gfs2_bufdata, bd_list_tr);
204 list_del_init(&bd->bd_list_tr);
207 gfs2_log_unlock(sdp);
208 gfs2_assert_warn(sdp, !tr->tr_num_buf);
211 static void buf_lo_before_commit(struct gfs2_sbd *sdp)
213 struct buffer_head *bh;
214 struct gfs2_log_descriptor *ld;
215 struct gfs2_bufdata *bd1 = NULL, *bd2;
222 limit = buf_limit(sdp);
223 /* for 4k blocks, limit = 503 */
226 total = sdp->sd_log_num_buf;
227 bd1 = bd2 = list_prepare_entry(bd1, &sdp->sd_log_le_buf, bd_le.le_list);
232 gfs2_log_unlock(sdp);
233 bh = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_METADATA);
235 ld = bh_log_desc(bh);
236 ptr = bh_log_ptr(bh);
237 ld->ld_length = cpu_to_be32(num + 1);
238 ld->ld_data1 = cpu_to_be32(num);
241 list_for_each_entry_continue(bd1, &sdp->sd_log_le_buf,
243 *ptr++ = cpu_to_be64(bd1->bd_bh->b_blocknr);
248 gfs2_log_unlock(sdp);
249 submit_bh(WRITE, bh);
253 list_for_each_entry_continue(bd2, &sdp->sd_log_le_buf,
256 gfs2_log_unlock(sdp);
257 lock_buffer(bd2->bd_bh);
258 bh = gfs2_log_fake_buf(sdp, bd2->bd_bh);
259 submit_bh(WRITE, bh);
268 gfs2_log_unlock(sdp);
271 static void buf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
273 struct list_head *head = &sdp->sd_log_le_buf;
274 struct gfs2_bufdata *bd;
276 while (!list_empty(head)) {
277 bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
278 list_del_init(&bd->bd_le.le_list);
279 sdp->sd_log_num_buf--;
281 gfs2_unpin(sdp, bd->bd_bh, ai);
283 gfs2_assert_warn(sdp, !sdp->sd_log_num_buf);
286 static void buf_lo_before_scan(struct gfs2_jdesc *jd,
287 struct gfs2_log_header_host *head, int pass)
289 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
294 sdp->sd_found_blocks = 0;
295 sdp->sd_replayed_blocks = 0;
298 static int buf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
299 struct gfs2_log_descriptor *ld, __be64 *ptr,
302 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
303 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
304 struct gfs2_glock *gl = ip->i_gl;
305 unsigned int blks = be32_to_cpu(ld->ld_data1);
306 struct buffer_head *bh_log, *bh_ip;
310 if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_METADATA)
313 gfs2_replay_incr_blk(sdp, &start);
315 for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
316 blkno = be64_to_cpu(*ptr++);
318 sdp->sd_found_blocks++;
320 if (gfs2_revoke_check(sdp, blkno, start))
323 error = gfs2_replay_read_block(jd, start, &bh_log);
327 bh_ip = gfs2_meta_new(gl, blkno);
328 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
330 if (gfs2_meta_check(sdp, bh_ip))
333 mark_buffer_dirty(bh_ip);
341 sdp->sd_replayed_blocks++;
347 static void buf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
349 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
350 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
353 gfs2_meta_sync(ip->i_gl);
359 gfs2_meta_sync(ip->i_gl);
361 fs_info(sdp, "jid=%u: Replayed %u of %u blocks\n",
362 jd->jd_jid, sdp->sd_replayed_blocks, sdp->sd_found_blocks);
365 static void revoke_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
367 struct gfs2_trans *tr;
369 tr = current->journal_info;
372 sdp->sd_log_num_revoke++;
373 list_add(&le->le_list, &sdp->sd_log_le_revoke);
376 static void revoke_lo_before_commit(struct gfs2_sbd *sdp)
378 struct gfs2_log_descriptor *ld;
379 struct gfs2_meta_header *mh;
380 struct buffer_head *bh;
382 struct list_head *head = &sdp->sd_log_le_revoke;
383 struct gfs2_bufdata *bd;
385 if (!sdp->sd_log_num_revoke)
388 bh = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_REVOKE);
389 ld = bh_log_desc(bh);
390 ld->ld_length = cpu_to_be32(gfs2_struct2blk(sdp, sdp->sd_log_num_revoke,
392 ld->ld_data1 = cpu_to_be32(sdp->sd_log_num_revoke);
393 offset = sizeof(struct gfs2_log_descriptor);
395 while (!list_empty(head)) {
396 bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
397 list_del_init(&bd->bd_le.le_list);
398 sdp->sd_log_num_revoke--;
400 if (offset + sizeof(u64) > sdp->sd_sb.sb_bsize) {
401 submit_bh(WRITE, bh);
403 bh = gfs2_log_get_buf(sdp);
404 mh = (struct gfs2_meta_header *)bh->b_data;
405 mh->mh_magic = cpu_to_be32(GFS2_MAGIC);
406 mh->mh_type = cpu_to_be32(GFS2_METATYPE_LB);
407 mh->mh_format = cpu_to_be32(GFS2_FORMAT_LB);
408 offset = sizeof(struct gfs2_meta_header);
411 *(__be64 *)(bh->b_data + offset) = cpu_to_be64(bd->bd_blkno);
412 kmem_cache_free(gfs2_bufdata_cachep, bd);
414 offset += sizeof(u64);
416 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
418 submit_bh(WRITE, bh);
421 static void revoke_lo_before_scan(struct gfs2_jdesc *jd,
422 struct gfs2_log_header_host *head, int pass)
424 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
429 sdp->sd_found_revokes = 0;
430 sdp->sd_replay_tail = head->lh_tail;
433 static int revoke_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
434 struct gfs2_log_descriptor *ld, __be64 *ptr,
437 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
438 unsigned int blks = be32_to_cpu(ld->ld_length);
439 unsigned int revokes = be32_to_cpu(ld->ld_data1);
440 struct buffer_head *bh;
446 if (pass != 0 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_REVOKE)
449 offset = sizeof(struct gfs2_log_descriptor);
451 for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
452 error = gfs2_replay_read_block(jd, start, &bh);
457 gfs2_metatype_check(sdp, bh, GFS2_METATYPE_LB);
459 while (offset + sizeof(u64) <= sdp->sd_sb.sb_bsize) {
460 blkno = be64_to_cpu(*(__be64 *)(bh->b_data + offset));
462 error = gfs2_revoke_add(sdp, blkno, start);
466 sdp->sd_found_revokes++;
470 offset += sizeof(u64);
474 offset = sizeof(struct gfs2_meta_header);
481 static void revoke_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
483 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
486 gfs2_revoke_clean(sdp);
492 fs_info(sdp, "jid=%u: Found %u revoke tags\n",
493 jd->jd_jid, sdp->sd_found_revokes);
495 gfs2_revoke_clean(sdp);
498 static void rg_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
500 struct gfs2_rgrpd *rgd;
501 struct gfs2_trans *tr = current->journal_info;
505 rgd = container_of(le, struct gfs2_rgrpd, rd_le);
508 if (!list_empty(&le->le_list)){
509 gfs2_log_unlock(sdp);
512 gfs2_rgrp_bh_hold(rgd);
513 sdp->sd_log_num_rg++;
514 list_add(&le->le_list, &sdp->sd_log_le_rg);
515 gfs2_log_unlock(sdp);
518 static void rg_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
520 struct list_head *head = &sdp->sd_log_le_rg;
521 struct gfs2_rgrpd *rgd;
523 while (!list_empty(head)) {
524 rgd = list_entry(head->next, struct gfs2_rgrpd, rd_le.le_list);
525 list_del_init(&rgd->rd_le.le_list);
526 sdp->sd_log_num_rg--;
528 gfs2_rgrp_repolish_clones(rgd);
529 gfs2_rgrp_bh_put(rgd);
531 gfs2_assert_warn(sdp, !sdp->sd_log_num_rg);
535 * databuf_lo_add - Add a databuf to the transaction.
537 * This is used in two distinct cases:
538 * i) In ordered write mode
539 * We put the data buffer on a list so that we can ensure that its
540 * synced to disk at the right time
541 * ii) In journaled data mode
542 * We need to journal the data block in the same way as metadata in
543 * the functions above. The difference is that here we have a tag
544 * which is two __be64's being the block number (as per meta data)
545 * and a flag which says whether the data block needs escaping or
546 * not. This means we need a new log entry for each 251 or so data
547 * blocks, which isn't an enormous overhead but twice as much as
548 * for normal metadata blocks.
550 static void databuf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
552 struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
553 struct gfs2_trans *tr = current->journal_info;
554 struct address_space *mapping = bd->bd_bh->b_page->mapping;
555 struct gfs2_inode *ip = GFS2_I(mapping->host);
557 lock_buffer(bd->bd_bh);
559 if (!list_empty(&bd->bd_list_tr))
562 if (gfs2_is_jdata(ip)) {
564 list_add(&bd->bd_list_tr, &tr->tr_list_buf);
566 if (!list_empty(&le->le_list))
569 __glock_lo_add(sdp, &bd->bd_gl->gl_le);
570 if (gfs2_is_jdata(ip)) {
571 gfs2_pin(sdp, bd->bd_bh);
572 tr->tr_num_databuf_new++;
573 sdp->sd_log_num_databuf++;
574 list_add(&le->le_list, &sdp->sd_log_le_databuf);
576 list_add(&le->le_list, &sdp->sd_log_le_ordered);
579 gfs2_log_unlock(sdp);
580 unlock_buffer(bd->bd_bh);
583 static void gfs2_check_magic(struct buffer_head *bh)
588 clear_buffer_escaped(bh);
589 kaddr = kmap_atomic(bh->b_page, KM_USER0);
590 ptr = kaddr + bh_offset(bh);
591 if (*ptr == cpu_to_be32(GFS2_MAGIC))
592 set_buffer_escaped(bh);
593 kunmap_atomic(kaddr, KM_USER0);
596 static void gfs2_write_blocks(struct gfs2_sbd *sdp, struct buffer_head *bh,
597 struct list_head *list, struct list_head *done,
600 struct buffer_head *bh1;
601 struct gfs2_log_descriptor *ld;
602 struct gfs2_bufdata *bd;
608 ld = bh_log_desc(bh);
609 ld->ld_length = cpu_to_be32(n + 1);
610 ld->ld_data1 = cpu_to_be32(n);
612 ptr = bh_log_ptr(bh);
615 submit_bh(WRITE, bh);
617 while(!list_empty(list)) {
618 bd = list_entry(list->next, struct gfs2_bufdata, bd_le.le_list);
619 list_move_tail(&bd->bd_le.le_list, done);
621 while (be64_to_cpu(*ptr) != bd->bd_bh->b_blocknr) {
622 gfs2_log_incr_head(sdp);
625 gfs2_log_unlock(sdp);
626 lock_buffer(bd->bd_bh);
627 if (buffer_escaped(bd->bd_bh)) {
629 bh1 = gfs2_log_get_buf(sdp);
630 kaddr = kmap_atomic(bd->bd_bh->b_page, KM_USER0);
631 memcpy(bh1->b_data, kaddr + bh_offset(bd->bd_bh),
633 kunmap_atomic(kaddr, KM_USER0);
634 *(__be32 *)bh1->b_data = 0;
635 clear_buffer_escaped(bd->bd_bh);
636 unlock_buffer(bd->bd_bh);
639 bh1 = gfs2_log_fake_buf(sdp, bd->bd_bh);
641 submit_bh(WRITE, bh1);
645 gfs2_log_unlock(sdp);
650 * databuf_lo_before_commit - Scan the data buffers, writing as we go
654 static void databuf_lo_before_commit(struct gfs2_sbd *sdp)
656 struct gfs2_bufdata *bd = NULL;
657 struct buffer_head *bh = NULL;
659 __be64 *ptr = NULL, *end = NULL;
660 LIST_HEAD(processed);
661 LIST_HEAD(in_progress);
664 while (!list_empty(&sdp->sd_log_le_databuf)) {
666 gfs2_log_unlock(sdp);
667 gfs2_write_blocks(sdp, bh, &in_progress, &processed, n);
669 bh = gfs2_get_log_desc(sdp, GFS2_LOG_DESC_JDATA);
670 ptr = bh_log_ptr(bh);
671 end = bh_ptr_end(bh) - 1;
675 bd = list_entry(sdp->sd_log_le_databuf.next, struct gfs2_bufdata, bd_le.le_list);
676 list_move_tail(&bd->bd_le.le_list, &in_progress);
677 gfs2_check_magic(bd->bd_bh);
678 *ptr++ = cpu_to_be64(bd->bd_bh->b_blocknr);
679 *ptr++ = cpu_to_be64(buffer_escaped(bh) ? 1 : 0);
682 gfs2_log_unlock(sdp);
683 gfs2_write_blocks(sdp, bh, &in_progress, &processed, n);
685 list_splice(&processed, &sdp->sd_log_le_databuf);
686 gfs2_log_unlock(sdp);
689 static int databuf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
690 struct gfs2_log_descriptor *ld,
691 __be64 *ptr, int pass)
693 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
694 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
695 struct gfs2_glock *gl = ip->i_gl;
696 unsigned int blks = be32_to_cpu(ld->ld_data1);
697 struct buffer_head *bh_log, *bh_ip;
702 if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_JDATA)
705 gfs2_replay_incr_blk(sdp, &start);
706 for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
707 blkno = be64_to_cpu(*ptr++);
708 esc = be64_to_cpu(*ptr++);
710 sdp->sd_found_blocks++;
712 if (gfs2_revoke_check(sdp, blkno, start))
715 error = gfs2_replay_read_block(jd, start, &bh_log);
719 bh_ip = gfs2_meta_new(gl, blkno);
720 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
724 __be32 *eptr = (__be32 *)bh_ip->b_data;
725 *eptr = cpu_to_be32(GFS2_MAGIC);
727 mark_buffer_dirty(bh_ip);
734 sdp->sd_replayed_blocks++;
740 /* FIXME: sort out accounting for log blocks etc. */
742 static void databuf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
744 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
745 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
748 gfs2_meta_sync(ip->i_gl);
755 gfs2_meta_sync(ip->i_gl);
757 fs_info(sdp, "jid=%u: Replayed %u of %u data blocks\n",
758 jd->jd_jid, sdp->sd_replayed_blocks, sdp->sd_found_blocks);
761 static void databuf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
763 struct list_head *head = &sdp->sd_log_le_databuf;
764 struct gfs2_bufdata *bd;
766 while (!list_empty(head)) {
767 bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
768 list_del_init(&bd->bd_le.le_list);
769 sdp->sd_log_num_databuf--;
770 gfs2_unpin(sdp, bd->bd_bh, ai);
772 gfs2_assert_warn(sdp, !sdp->sd_log_num_databuf);
776 const struct gfs2_log_operations gfs2_glock_lops = {
777 .lo_add = glock_lo_add,
778 .lo_after_commit = glock_lo_after_commit,
782 const struct gfs2_log_operations gfs2_buf_lops = {
783 .lo_add = buf_lo_add,
784 .lo_incore_commit = buf_lo_incore_commit,
785 .lo_before_commit = buf_lo_before_commit,
786 .lo_after_commit = buf_lo_after_commit,
787 .lo_before_scan = buf_lo_before_scan,
788 .lo_scan_elements = buf_lo_scan_elements,
789 .lo_after_scan = buf_lo_after_scan,
793 const struct gfs2_log_operations gfs2_revoke_lops = {
794 .lo_add = revoke_lo_add,
795 .lo_before_commit = revoke_lo_before_commit,
796 .lo_before_scan = revoke_lo_before_scan,
797 .lo_scan_elements = revoke_lo_scan_elements,
798 .lo_after_scan = revoke_lo_after_scan,
802 const struct gfs2_log_operations gfs2_rg_lops = {
804 .lo_after_commit = rg_lo_after_commit,
808 const struct gfs2_log_operations gfs2_databuf_lops = {
809 .lo_add = databuf_lo_add,
810 .lo_incore_commit = buf_lo_incore_commit,
811 .lo_before_commit = databuf_lo_before_commit,
812 .lo_after_commit = databuf_lo_after_commit,
813 .lo_scan_elements = databuf_lo_scan_elements,
814 .lo_after_scan = databuf_lo_after_scan,
815 .lo_name = "databuf",
818 const struct gfs2_log_operations *gfs2_log_ops[] = {