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>
29 static void glock_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
31 struct gfs2_glock *gl;
32 struct gfs2_trans *tr = current->journal_info;
36 gl = container_of(le, struct gfs2_glock, gl_le);
37 if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(gl)))
41 if (!list_empty(&le->le_list)){
46 set_bit(GLF_DIRTY, &gl->gl_flags);
48 list_add(&le->le_list, &sdp->sd_log_le_gl);
52 static void glock_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
54 struct list_head *head = &sdp->sd_log_le_gl;
55 struct gfs2_glock *gl;
57 while (!list_empty(head)) {
58 gl = list_entry(head->next, struct gfs2_glock, gl_le.le_list);
59 list_del_init(&gl->gl_le.le_list);
62 gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(gl));
65 gfs2_assert_warn(sdp, !sdp->sd_log_num_gl);
68 static void buf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
70 struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
71 struct gfs2_trans *tr;
74 if (!list_empty(&bd->bd_list_tr)) {
78 tr = current->journal_info;
81 list_add(&bd->bd_list_tr, &tr->tr_list_buf);
84 if (!list_empty(&le->le_list))
87 gfs2_trans_add_gl(bd->bd_gl);
89 gfs2_meta_check(sdp, bd->bd_bh);
90 gfs2_pin(sdp, bd->bd_bh);
92 sdp->sd_log_num_buf++;
93 list_add(&le->le_list, &sdp->sd_log_le_buf);
99 static void buf_lo_incore_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
101 struct list_head *head = &tr->tr_list_buf;
102 struct gfs2_bufdata *bd;
105 while (!list_empty(head)) {
106 bd = list_entry(head->next, struct gfs2_bufdata, bd_list_tr);
107 list_del_init(&bd->bd_list_tr);
110 gfs2_log_unlock(sdp);
111 gfs2_assert_warn(sdp, !tr->tr_num_buf);
114 static void buf_lo_before_commit(struct gfs2_sbd *sdp)
116 struct buffer_head *bh;
117 struct gfs2_log_descriptor *ld;
118 struct gfs2_bufdata *bd1 = NULL, *bd2;
119 unsigned int total = sdp->sd_log_num_buf;
120 unsigned int offset = sizeof(struct gfs2_log_descriptor);
126 offset += sizeof(__be64) - 1;
127 offset &= ~(sizeof(__be64) - 1);
128 limit = (sdp->sd_sb.sb_bsize - offset)/sizeof(__be64);
129 /* for 4k blocks, limit = 503 */
131 bd1 = bd2 = list_prepare_entry(bd1, &sdp->sd_log_le_buf, bd_le.le_list);
136 bh = gfs2_log_get_buf(sdp);
137 sdp->sd_log_num_hdrs++;
138 ld = (struct gfs2_log_descriptor *)bh->b_data;
139 ptr = (__be64 *)(bh->b_data + offset);
140 ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
141 ld->ld_header.mh_type = cpu_to_be32(GFS2_METATYPE_LD);
142 ld->ld_header.mh_format = cpu_to_be32(GFS2_FORMAT_LD);
143 ld->ld_type = cpu_to_be32(GFS2_LOG_DESC_METADATA);
144 ld->ld_length = cpu_to_be32(num + 1);
145 ld->ld_data1 = cpu_to_be32(num);
146 ld->ld_data2 = cpu_to_be32(0);
147 memset(ld->ld_reserved, 0, sizeof(ld->ld_reserved));
150 list_for_each_entry_continue(bd1, &sdp->sd_log_le_buf,
152 *ptr++ = cpu_to_be64(bd1->bd_bh->b_blocknr);
157 set_buffer_dirty(bh);
158 ll_rw_block(WRITE, 1, &bh);
161 list_for_each_entry_continue(bd2, &sdp->sd_log_le_buf,
163 bh = gfs2_log_fake_buf(sdp, bd2->bd_bh);
164 set_buffer_dirty(bh);
165 ll_rw_block(WRITE, 1, &bh);
174 static void buf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
176 struct list_head *head = &sdp->sd_log_le_buf;
177 struct gfs2_bufdata *bd;
179 while (!list_empty(head)) {
180 bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
181 list_del_init(&bd->bd_le.le_list);
182 sdp->sd_log_num_buf--;
184 gfs2_unpin(sdp, bd->bd_bh, ai);
186 gfs2_assert_warn(sdp, !sdp->sd_log_num_buf);
189 static void buf_lo_before_scan(struct gfs2_jdesc *jd,
190 struct gfs2_log_header_host *head, int pass)
192 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
197 sdp->sd_found_blocks = 0;
198 sdp->sd_replayed_blocks = 0;
201 static int buf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
202 struct gfs2_log_descriptor *ld, __be64 *ptr,
205 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
206 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
207 struct gfs2_glock *gl = ip->i_gl;
208 unsigned int blks = be32_to_cpu(ld->ld_data1);
209 struct buffer_head *bh_log, *bh_ip;
213 if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_METADATA)
216 gfs2_replay_incr_blk(sdp, &start);
218 for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
219 blkno = be64_to_cpu(*ptr++);
221 sdp->sd_found_blocks++;
223 if (gfs2_revoke_check(sdp, blkno, start))
226 error = gfs2_replay_read_block(jd, start, &bh_log);
230 bh_ip = gfs2_meta_new(gl, blkno);
231 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
233 if (gfs2_meta_check(sdp, bh_ip))
236 mark_buffer_dirty(bh_ip);
244 sdp->sd_replayed_blocks++;
250 static void buf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
252 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
253 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
256 gfs2_meta_sync(ip->i_gl);
262 gfs2_meta_sync(ip->i_gl);
264 fs_info(sdp, "jid=%u: Replayed %u of %u blocks\n",
265 jd->jd_jid, sdp->sd_replayed_blocks, sdp->sd_found_blocks);
268 static void revoke_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
270 struct gfs2_trans *tr;
272 tr = current->journal_info;
277 sdp->sd_log_num_revoke++;
278 list_add(&le->le_list, &sdp->sd_log_le_revoke);
279 gfs2_log_unlock(sdp);
282 static void revoke_lo_before_commit(struct gfs2_sbd *sdp)
284 struct gfs2_log_descriptor *ld;
285 struct gfs2_meta_header *mh;
286 struct buffer_head *bh;
288 struct list_head *head = &sdp->sd_log_le_revoke;
289 struct gfs2_revoke *rv;
291 if (!sdp->sd_log_num_revoke)
294 bh = gfs2_log_get_buf(sdp);
295 ld = (struct gfs2_log_descriptor *)bh->b_data;
296 ld->ld_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
297 ld->ld_header.mh_type = cpu_to_be32(GFS2_METATYPE_LD);
298 ld->ld_header.mh_format = cpu_to_be32(GFS2_FORMAT_LD);
299 ld->ld_type = cpu_to_be32(GFS2_LOG_DESC_REVOKE);
300 ld->ld_length = cpu_to_be32(gfs2_struct2blk(sdp, sdp->sd_log_num_revoke,
302 ld->ld_data1 = cpu_to_be32(sdp->sd_log_num_revoke);
303 ld->ld_data2 = cpu_to_be32(0);
304 memset(ld->ld_reserved, 0, sizeof(ld->ld_reserved));
305 offset = sizeof(struct gfs2_log_descriptor);
307 while (!list_empty(head)) {
308 rv = list_entry(head->next, struct gfs2_revoke, rv_le.le_list);
309 list_del_init(&rv->rv_le.le_list);
310 sdp->sd_log_num_revoke--;
312 if (offset + sizeof(u64) > sdp->sd_sb.sb_bsize) {
313 set_buffer_dirty(bh);
314 ll_rw_block(WRITE, 1, &bh);
316 bh = gfs2_log_get_buf(sdp);
317 mh = (struct gfs2_meta_header *)bh->b_data;
318 mh->mh_magic = cpu_to_be32(GFS2_MAGIC);
319 mh->mh_type = cpu_to_be32(GFS2_METATYPE_LB);
320 mh->mh_format = cpu_to_be32(GFS2_FORMAT_LB);
321 offset = sizeof(struct gfs2_meta_header);
324 *(__be64 *)(bh->b_data + offset) = cpu_to_be64(rv->rv_blkno);
327 offset += sizeof(u64);
329 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
331 set_buffer_dirty(bh);
332 ll_rw_block(WRITE, 1, &bh);
335 static void revoke_lo_before_scan(struct gfs2_jdesc *jd,
336 struct gfs2_log_header_host *head, int pass)
338 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
343 sdp->sd_found_revokes = 0;
344 sdp->sd_replay_tail = head->lh_tail;
347 static int revoke_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
348 struct gfs2_log_descriptor *ld, __be64 *ptr,
351 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
352 unsigned int blks = be32_to_cpu(ld->ld_length);
353 unsigned int revokes = be32_to_cpu(ld->ld_data1);
354 struct buffer_head *bh;
360 if (pass != 0 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_REVOKE)
363 offset = sizeof(struct gfs2_log_descriptor);
365 for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
366 error = gfs2_replay_read_block(jd, start, &bh);
371 gfs2_metatype_check(sdp, bh, GFS2_METATYPE_LB);
373 while (offset + sizeof(u64) <= sdp->sd_sb.sb_bsize) {
374 blkno = be64_to_cpu(*(__be64 *)(bh->b_data + offset));
376 error = gfs2_revoke_add(sdp, blkno, start);
380 sdp->sd_found_revokes++;
384 offset += sizeof(u64);
388 offset = sizeof(struct gfs2_meta_header);
395 static void revoke_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
397 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
400 gfs2_revoke_clean(sdp);
406 fs_info(sdp, "jid=%u: Found %u revoke tags\n",
407 jd->jd_jid, sdp->sd_found_revokes);
409 gfs2_revoke_clean(sdp);
412 static void rg_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
414 struct gfs2_rgrpd *rgd;
415 struct gfs2_trans *tr = current->journal_info;
419 rgd = container_of(le, struct gfs2_rgrpd, rd_le);
422 if (!list_empty(&le->le_list)){
423 gfs2_log_unlock(sdp);
426 gfs2_rgrp_bh_hold(rgd);
427 sdp->sd_log_num_rg++;
428 list_add(&le->le_list, &sdp->sd_log_le_rg);
429 gfs2_log_unlock(sdp);
432 static void rg_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
434 struct list_head *head = &sdp->sd_log_le_rg;
435 struct gfs2_rgrpd *rgd;
437 while (!list_empty(head)) {
438 rgd = list_entry(head->next, struct gfs2_rgrpd, rd_le.le_list);
439 list_del_init(&rgd->rd_le.le_list);
440 sdp->sd_log_num_rg--;
442 gfs2_rgrp_repolish_clones(rgd);
443 gfs2_rgrp_bh_put(rgd);
445 gfs2_assert_warn(sdp, !sdp->sd_log_num_rg);
449 * databuf_lo_add - Add a databuf to the transaction.
451 * This is used in two distinct cases:
452 * i) In ordered write mode
453 * We put the data buffer on a list so that we can ensure that its
454 * synced to disk at the right time
455 * ii) In journaled data mode
456 * We need to journal the data block in the same way as metadata in
457 * the functions above. The difference is that here we have a tag
458 * which is two __be64's being the block number (as per meta data)
459 * and a flag which says whether the data block needs escaping or
460 * not. This means we need a new log entry for each 251 or so data
461 * blocks, which isn't an enormous overhead but twice as much as
462 * for normal metadata blocks.
464 static void databuf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
466 struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
467 struct gfs2_trans *tr = current->journal_info;
468 struct address_space *mapping = bd->bd_bh->b_page->mapping;
469 struct gfs2_inode *ip = GFS2_I(mapping->host);
473 if (list_empty(&bd->bd_list_tr) &&
474 (ip->i_di.di_flags & GFS2_DIF_JDATA)) {
476 list_add(&bd->bd_list_tr, &tr->tr_list_buf);
477 gfs2_log_unlock(sdp);
478 if (!list_empty(&le->le_list))
480 gfs2_pin(sdp, bd->bd_bh);
481 tr->tr_num_buf_new++;
483 gfs2_log_unlock(sdp);
485 gfs2_trans_add_gl(bd->bd_gl);
487 if (list_empty(&le->le_list)) {
488 if (ip->i_di.di_flags & GFS2_DIF_JDATA)
489 sdp->sd_log_num_jdata++;
490 sdp->sd_log_num_databuf++;
491 list_add(&le->le_list, &sdp->sd_log_le_databuf);
493 gfs2_log_unlock(sdp);
496 static int gfs2_check_magic(struct buffer_head *bh)
498 struct page *page = bh->b_page;
503 kaddr = kmap_atomic(page, KM_USER0);
504 ptr = kaddr + bh_offset(bh);
505 if (*ptr == cpu_to_be32(GFS2_MAGIC))
507 kunmap_atomic(kaddr, KM_USER0);
513 * databuf_lo_before_commit - Scan the data buffers, writing as we go
515 * Here we scan through the lists of buffers and make the assumption
516 * that any buffer thats been pinned is being journaled, and that
517 * any unpinned buffer is an ordered write data buffer and therefore
518 * will be written back rather than journaled.
520 static void databuf_lo_before_commit(struct gfs2_sbd *sdp)
523 struct gfs2_bufdata *bd1 = NULL, *bd2, *bdt;
524 struct buffer_head *bh = NULL,*bh1 = NULL;
525 unsigned int offset = sizeof(struct gfs2_log_descriptor);
526 struct gfs2_log_descriptor *ld;
528 unsigned int total_dbuf = sdp->sd_log_num_databuf;
529 unsigned int total_jdata = sdp->sd_log_num_jdata;
533 offset += 2*sizeof(__be64) - 1;
534 offset &= ~(2*sizeof(__be64) - 1);
535 limit = (sdp->sd_sb.sb_bsize - offset)/sizeof(__be64);
538 * Start writing ordered buffers, write journaled buffers
539 * into the log along with a header
542 bd2 = bd1 = list_prepare_entry(bd1, &sdp->sd_log_le_databuf,
549 list_for_each_entry_safe_continue(bd1, bdt,
550 &sdp->sd_log_le_databuf,
552 /* store off the buffer head in a local ptr since
553 * gfs2_bufdata might change when we drop the log lock
557 /* An ordered write buffer */
558 if (bh1 && !buffer_pinned(bh1)) {
559 list_move(&bd1->bd_le.le_list, &started);
562 bd2 = list_prepare_entry(bd2,
563 &sdp->sd_log_le_databuf,
568 if (buffer_dirty(bh1)) {
571 gfs2_log_unlock(sdp);
573 ll_rw_block(SWRITE, 1, &bh1);
581 } else if (bh1) { /* A journaled buffer */
583 gfs2_log_unlock(sdp);
585 bh = gfs2_log_get_buf(sdp);
586 sdp->sd_log_num_hdrs++;
587 ld = (struct gfs2_log_descriptor *)
589 ptr = (__be64 *)(bh->b_data + offset);
590 ld->ld_header.mh_magic =
591 cpu_to_be32(GFS2_MAGIC);
592 ld->ld_header.mh_type =
593 cpu_to_be32(GFS2_METATYPE_LD);
594 ld->ld_header.mh_format =
595 cpu_to_be32(GFS2_FORMAT_LD);
597 cpu_to_be32(GFS2_LOG_DESC_JDATA);
598 ld->ld_length = cpu_to_be32(num + 1);
599 ld->ld_data1 = cpu_to_be32(num);
600 ld->ld_data2 = cpu_to_be32(0);
601 memset(ld->ld_reserved, 0, sizeof(ld->ld_reserved));
603 magic = gfs2_check_magic(bh1);
604 *ptr++ = cpu_to_be64(bh1->b_blocknr);
605 *ptr++ = cpu_to_be64((__u64)magic);
606 clear_buffer_escaped(bh1);
607 if (unlikely(magic != 0))
608 set_buffer_escaped(bh1);
614 sdp->sd_log_num_databuf--;
615 list_del_init(&bd1->bd_le.le_list);
618 bd2 = list_prepare_entry(bd2,
619 &sdp->sd_log_le_databuf,
622 kmem_cache_free(gfs2_bufdata_cachep, bd1);
625 gfs2_log_unlock(sdp);
627 set_buffer_dirty(bh);
628 ll_rw_block(WRITE, 1, &bh);
633 list_for_each_entry_continue(bd2, &sdp->sd_log_le_databuf,
637 /* copy buffer if it needs escaping */
638 gfs2_log_unlock(sdp);
639 if (unlikely(buffer_escaped(bd2->bd_bh))) {
641 struct page *page = bd2->bd_bh->b_page;
642 bh = gfs2_log_get_buf(sdp);
643 kaddr = kmap_atomic(page, KM_USER0);
645 kaddr + bh_offset(bd2->bd_bh),
646 sdp->sd_sb.sb_bsize);
647 kunmap_atomic(kaddr, KM_USER0);
648 *(__be32 *)bh->b_data = 0;
650 bh = gfs2_log_fake_buf(sdp, bd2->bd_bh);
652 set_buffer_dirty(bh);
653 ll_rw_block(WRITE, 1, &bh);
662 gfs2_log_unlock(sdp);
664 /* Wait on all ordered buffers */
665 while (!list_empty(&started)) {
667 bd1 = list_entry(started.next, struct gfs2_bufdata,
669 list_del_init(&bd1->bd_le.le_list);
670 sdp->sd_log_num_databuf--;
673 bh->b_private = NULL;
675 gfs2_log_unlock(sdp);
679 gfs2_log_unlock(sdp);
681 kmem_cache_free(gfs2_bufdata_cachep, bd1);
684 /* We've removed all the ordered write bufs here, so only jdata left */
685 gfs2_assert_warn(sdp, sdp->sd_log_num_databuf == sdp->sd_log_num_jdata);
688 static int databuf_lo_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
689 struct gfs2_log_descriptor *ld,
690 __be64 *ptr, int pass)
692 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
693 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
694 struct gfs2_glock *gl = ip->i_gl;
695 unsigned int blks = be32_to_cpu(ld->ld_data1);
696 struct buffer_head *bh_log, *bh_ip;
701 if (pass != 1 || be32_to_cpu(ld->ld_type) != GFS2_LOG_DESC_JDATA)
704 gfs2_replay_incr_blk(sdp, &start);
705 for (; blks; gfs2_replay_incr_blk(sdp, &start), blks--) {
706 blkno = be64_to_cpu(*ptr++);
707 esc = be64_to_cpu(*ptr++);
709 sdp->sd_found_blocks++;
711 if (gfs2_revoke_check(sdp, blkno, start))
714 error = gfs2_replay_read_block(jd, start, &bh_log);
718 bh_ip = gfs2_meta_new(gl, blkno);
719 memcpy(bh_ip->b_data, bh_log->b_data, bh_log->b_size);
723 __be32 *eptr = (__be32 *)bh_ip->b_data;
724 *eptr = cpu_to_be32(GFS2_MAGIC);
726 mark_buffer_dirty(bh_ip);
733 sdp->sd_replayed_blocks++;
739 /* FIXME: sort out accounting for log blocks etc. */
741 static void databuf_lo_after_scan(struct gfs2_jdesc *jd, int error, int pass)
743 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
744 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
747 gfs2_meta_sync(ip->i_gl);
754 gfs2_meta_sync(ip->i_gl);
756 fs_info(sdp, "jid=%u: Replayed %u of %u data blocks\n",
757 jd->jd_jid, sdp->sd_replayed_blocks, sdp->sd_found_blocks);
760 static void databuf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
762 struct list_head *head = &sdp->sd_log_le_databuf;
763 struct gfs2_bufdata *bd;
765 while (!list_empty(head)) {
766 bd = list_entry(head->next, struct gfs2_bufdata, bd_le.le_list);
767 list_del_init(&bd->bd_le.le_list);
768 sdp->sd_log_num_databuf--;
769 sdp->sd_log_num_jdata--;
770 gfs2_unpin(sdp, bd->bd_bh, ai);
772 gfs2_assert_warn(sdp, !sdp->sd_log_num_databuf);
773 gfs2_assert_warn(sdp, !sdp->sd_log_num_jdata);
777 const struct gfs2_log_operations gfs2_glock_lops = {
778 .lo_add = glock_lo_add,
779 .lo_after_commit = glock_lo_after_commit,
783 const struct gfs2_log_operations gfs2_buf_lops = {
784 .lo_add = buf_lo_add,
785 .lo_incore_commit = buf_lo_incore_commit,
786 .lo_before_commit = buf_lo_before_commit,
787 .lo_after_commit = buf_lo_after_commit,
788 .lo_before_scan = buf_lo_before_scan,
789 .lo_scan_elements = buf_lo_scan_elements,
790 .lo_after_scan = buf_lo_after_scan,
794 const struct gfs2_log_operations gfs2_revoke_lops = {
795 .lo_add = revoke_lo_add,
796 .lo_before_commit = revoke_lo_before_commit,
797 .lo_before_scan = revoke_lo_before_scan,
798 .lo_scan_elements = revoke_lo_scan_elements,
799 .lo_after_scan = revoke_lo_after_scan,
803 const struct gfs2_log_operations gfs2_rg_lops = {
805 .lo_after_commit = rg_lo_after_commit,
809 const struct gfs2_log_operations gfs2_databuf_lops = {
810 .lo_add = databuf_lo_add,
811 .lo_incore_commit = buf_lo_incore_commit,
812 .lo_before_commit = databuf_lo_before_commit,
813 .lo_after_commit = databuf_lo_after_commit,
814 .lo_scan_elements = databuf_lo_scan_elements,
815 .lo_after_scan = databuf_lo_after_scan,
816 .lo_name = "databuf",
819 const struct gfs2_log_operations *gfs2_log_ops[] = {