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/crc32.h>
17 #include <linux/lm_interface.h>
18 #include <linux/delay.h>
33 * gfs2_struct2blk - compute stuff
34 * @sdp: the filesystem
35 * @nstruct: the number of structures
36 * @ssize: the size of the structures
38 * Compute the number of log descriptor blocks needed to hold a certain number
39 * of structures of a certain size.
41 * Returns: the number of blocks needed (minimum is always 1)
44 unsigned int gfs2_struct2blk(struct gfs2_sbd
*sdp
, unsigned int nstruct
,
48 unsigned int first
, second
;
51 first
= (sdp
->sd_sb
.sb_bsize
- sizeof(struct gfs2_log_descriptor
)) / ssize
;
53 if (nstruct
> first
) {
54 second
= (sdp
->sd_sb
.sb_bsize
-
55 sizeof(struct gfs2_meta_header
)) / ssize
;
56 blks
+= DIV_ROUND_UP(nstruct
- first
, second
);
63 * gfs2_remove_from_ail - Remove an entry from the ail lists, updating counters
64 * @mapping: The associated mapping (maybe NULL)
65 * @bd: The gfs2_bufdata to remove
67 * The log lock _must_ be held when calling this function
71 void gfs2_remove_from_ail(struct address_space
*mapping
, struct gfs2_bufdata
*bd
)
74 list_del(&bd
->bd_ail_st_list
);
75 list_del(&bd
->bd_ail_gl_list
);
76 atomic_dec(&bd
->bd_gl
->gl_ail_count
);
78 gfs2_meta_cache_flush(GFS2_I(mapping
->host
));
83 * gfs2_ail1_start_one - Start I/O on a part of the AIL
84 * @sdp: the filesystem
85 * @tr: the part of the AIL
89 static void gfs2_ail1_start_one(struct gfs2_sbd
*sdp
, struct gfs2_ail
*ai
)
91 struct gfs2_bufdata
*bd
, *s
;
92 struct buffer_head
*bh
;
95 BUG_ON(!spin_is_locked(&sdp
->sd_log_lock
));
100 list_for_each_entry_safe_reverse(bd
, s
, &ai
->ai_ail1_list
,
104 gfs2_assert(sdp
, bd
->bd_ail
== ai
);
106 if (!buffer_busy(bh
)) {
107 if (!buffer_uptodate(bh
)) {
108 gfs2_log_unlock(sdp
);
109 gfs2_io_error_bh(sdp
, bh
);
112 list_move(&bd
->bd_ail_st_list
, &ai
->ai_ail2_list
);
116 if (!buffer_dirty(bh
))
119 list_move(&bd
->bd_ail_st_list
, &ai
->ai_ail1_list
);
121 gfs2_log_unlock(sdp
);
123 ll_rw_block(WRITE
, 1, &bh
);
133 * gfs2_ail1_empty_one - Check whether or not a trans in the AIL has been synced
134 * @sdp: the filesystem
139 static int gfs2_ail1_empty_one(struct gfs2_sbd
*sdp
, struct gfs2_ail
*ai
, int flags
)
141 struct gfs2_bufdata
*bd
, *s
;
142 struct buffer_head
*bh
;
144 list_for_each_entry_safe_reverse(bd
, s
, &ai
->ai_ail1_list
,
148 gfs2_assert(sdp
, bd
->bd_ail
== ai
);
150 if (buffer_busy(bh
)) {
157 if (!buffer_uptodate(bh
))
158 gfs2_io_error_bh(sdp
, bh
);
160 list_move(&bd
->bd_ail_st_list
, &ai
->ai_ail2_list
);
163 return list_empty(&ai
->ai_ail1_list
);
166 static void gfs2_ail1_start(struct gfs2_sbd
*sdp
, int flags
)
168 struct list_head
*head
;
170 struct list_head
*first
;
171 struct gfs2_ail
*first_ai
, *ai
, *tmp
;
175 head
= &sdp
->sd_ail1_list
;
176 if (list_empty(head
)) {
177 gfs2_log_unlock(sdp
);
180 sync_gen
= sdp
->sd_ail_sync_gen
++;
183 first_ai
= list_entry(first
, struct gfs2_ail
, ai_list
);
184 first_ai
->ai_sync_gen
= sync_gen
;
185 gfs2_ail1_start_one(sdp
, first_ai
); /* This may drop log lock */
191 if (first
&& (head
->prev
!= first
||
192 gfs2_ail1_empty_one(sdp
, first_ai
, 0)))
196 list_for_each_entry_safe_reverse(ai
, tmp
, head
, ai_list
) {
197 if (ai
->ai_sync_gen
>= sync_gen
)
199 ai
->ai_sync_gen
= sync_gen
;
200 gfs2_ail1_start_one(sdp
, ai
); /* This may drop log lock */
206 gfs2_log_unlock(sdp
);
209 int gfs2_ail1_empty(struct gfs2_sbd
*sdp
, int flags
)
211 struct gfs2_ail
*ai
, *s
;
216 list_for_each_entry_safe_reverse(ai
, s
, &sdp
->sd_ail1_list
, ai_list
) {
217 if (gfs2_ail1_empty_one(sdp
, ai
, flags
))
218 list_move(&ai
->ai_list
, &sdp
->sd_ail2_list
);
219 else if (!(flags
& DIO_ALL
))
223 ret
= list_empty(&sdp
->sd_ail1_list
);
225 gfs2_log_unlock(sdp
);
232 * gfs2_ail2_empty_one - Check whether or not a trans in the AIL has been synced
233 * @sdp: the filesystem
238 static void gfs2_ail2_empty_one(struct gfs2_sbd
*sdp
, struct gfs2_ail
*ai
)
240 struct list_head
*head
= &ai
->ai_ail2_list
;
241 struct gfs2_bufdata
*bd
;
243 while (!list_empty(head
)) {
244 bd
= list_entry(head
->prev
, struct gfs2_bufdata
,
246 gfs2_assert(sdp
, bd
->bd_ail
== ai
);
247 gfs2_remove_from_ail(bd
->bd_bh
->b_page
->mapping
, bd
);
251 static void ail2_empty(struct gfs2_sbd
*sdp
, unsigned int new_tail
)
253 struct gfs2_ail
*ai
, *safe
;
254 unsigned int old_tail
= sdp
->sd_log_tail
;
255 int wrap
= (new_tail
< old_tail
);
260 list_for_each_entry_safe(ai
, safe
, &sdp
->sd_ail2_list
, ai_list
) {
261 a
= (old_tail
<= ai
->ai_first
);
262 b
= (ai
->ai_first
< new_tail
);
263 rm
= (wrap
) ? (a
|| b
) : (a
&& b
);
267 gfs2_ail2_empty_one(sdp
, ai
);
268 list_del(&ai
->ai_list
);
269 gfs2_assert_warn(sdp
, list_empty(&ai
->ai_ail1_list
));
270 gfs2_assert_warn(sdp
, list_empty(&ai
->ai_ail2_list
));
274 gfs2_log_unlock(sdp
);
278 * gfs2_log_reserve - Make a log reservation
279 * @sdp: The GFS2 superblock
280 * @blks: The number of blocks to reserve
282 * Note that we never give out the last few blocks of the journal. Thats
283 * due to the fact that there is a small number of header blocks
284 * associated with each log flush. The exact number can't be known until
285 * flush time, so we ensure that we have just enough free blocks at all
286 * times to avoid running out during a log flush.
291 int gfs2_log_reserve(struct gfs2_sbd
*sdp
, unsigned int blks
)
293 unsigned int try = 0;
294 unsigned reserved_blks
= 6 * (4096 / sdp
->sd_vfs
->s_blocksize
);
296 if (gfs2_assert_warn(sdp
, blks
) ||
297 gfs2_assert_warn(sdp
, blks
<= sdp
->sd_jdesc
->jd_blocks
))
300 mutex_lock(&sdp
->sd_log_reserve_mutex
);
302 while(sdp
->sd_log_blks_free
<= (blks
+ reserved_blks
)) {
303 gfs2_log_unlock(sdp
);
304 gfs2_ail1_empty(sdp
, 0);
305 gfs2_log_flush(sdp
, NULL
);
308 gfs2_ail1_start(sdp
, 0);
311 sdp
->sd_log_blks_free
-= blks
;
312 gfs2_log_unlock(sdp
);
313 mutex_unlock(&sdp
->sd_log_reserve_mutex
);
315 down_read(&sdp
->sd_log_flush_lock
);
321 * gfs2_log_release - Release a given number of log blocks
322 * @sdp: The GFS2 superblock
323 * @blks: The number of blocks
327 void gfs2_log_release(struct gfs2_sbd
*sdp
, unsigned int blks
)
331 sdp
->sd_log_blks_free
+= blks
;
332 gfs2_assert_withdraw(sdp
,
333 sdp
->sd_log_blks_free
<= sdp
->sd_jdesc
->jd_blocks
);
334 gfs2_log_unlock(sdp
);
335 up_read(&sdp
->sd_log_flush_lock
);
338 static u64
log_bmap(struct gfs2_sbd
*sdp
, unsigned int lbn
)
340 struct inode
*inode
= sdp
->sd_jdesc
->jd_inode
;
342 struct buffer_head bh_map
= { .b_state
= 0, .b_blocknr
= 0 };
344 bh_map
.b_size
= 1 << inode
->i_blkbits
;
345 error
= gfs2_block_map(inode
, lbn
, 0, &bh_map
);
346 if (error
|| !bh_map
.b_blocknr
)
347 printk(KERN_INFO
"error=%d, dbn=%llu lbn=%u", error
,
348 (unsigned long long)bh_map
.b_blocknr
, lbn
);
349 gfs2_assert_withdraw(sdp
, !error
&& bh_map
.b_blocknr
);
351 return bh_map
.b_blocknr
;
355 * log_distance - Compute distance between two journal blocks
356 * @sdp: The GFS2 superblock
357 * @newer: The most recent journal block of the pair
358 * @older: The older journal block of the pair
360 * Compute the distance (in the journal direction) between two
361 * blocks in the journal
363 * Returns: the distance in blocks
366 static inline unsigned int log_distance(struct gfs2_sbd
*sdp
, unsigned int newer
,
371 dist
= newer
- older
;
373 dist
+= sdp
->sd_jdesc
->jd_blocks
;
379 * calc_reserved - Calculate the number of blocks to reserve when
380 * refunding a transaction's unused buffers.
381 * @sdp: The GFS2 superblock
383 * This is complex. We need to reserve room for all our currently used
384 * metadata buffers (e.g. normal file I/O rewriting file time stamps) and
385 * all our journaled data buffers for journaled files (e.g. files in the
386 * meta_fs like rindex, or files for which chattr +j was done.)
387 * If we don't reserve enough space, gfs2_log_refund and gfs2_log_flush
388 * will count it as free space (sd_log_blks_free) and corruption will follow.
390 * We can have metadata bufs and jdata bufs in the same journal. So each
391 * type gets its own log header, for which we need to reserve a block.
392 * In fact, each type has the potential for needing more than one header
393 * in cases where we have more buffers than will fit on a journal page.
394 * Metadata journal entries take up half the space of journaled buffer entries.
395 * Thus, metadata entries have buf_limit (502) and journaled buffers have
396 * databuf_limit (251) before they cause a wrap around.
398 * Also, we need to reserve blocks for revoke journal entries and one for an
399 * overall header for the lot.
401 * Returns: the number of blocks reserved
403 static unsigned int calc_reserved(struct gfs2_sbd
*sdp
)
405 unsigned int reserved
= 0;
406 unsigned int mbuf_limit
, metabufhdrs_needed
;
407 unsigned int dbuf_limit
, databufhdrs_needed
;
408 unsigned int revokes
= 0;
410 mbuf_limit
= buf_limit(sdp
);
411 metabufhdrs_needed
= (sdp
->sd_log_commited_buf
+
412 (mbuf_limit
- 1)) / mbuf_limit
;
413 dbuf_limit
= databuf_limit(sdp
);
414 databufhdrs_needed
= (sdp
->sd_log_commited_databuf
+
415 (dbuf_limit
- 1)) / dbuf_limit
;
417 if (sdp
->sd_log_commited_revoke
)
418 revokes
= gfs2_struct2blk(sdp
, sdp
->sd_log_commited_revoke
,
421 reserved
= sdp
->sd_log_commited_buf
+ metabufhdrs_needed
+
422 sdp
->sd_log_commited_databuf
+ databufhdrs_needed
+
424 /* One for the overall header */
430 static unsigned int current_tail(struct gfs2_sbd
*sdp
)
437 if (list_empty(&sdp
->sd_ail1_list
)) {
438 tail
= sdp
->sd_log_head
;
440 ai
= list_entry(sdp
->sd_ail1_list
.prev
, struct gfs2_ail
, ai_list
);
444 gfs2_log_unlock(sdp
);
449 static inline void log_incr_head(struct gfs2_sbd
*sdp
)
451 if (sdp
->sd_log_flush_head
== sdp
->sd_log_tail
)
452 gfs2_assert_withdraw(sdp
, sdp
->sd_log_flush_head
== sdp
->sd_log_head
);
454 if (++sdp
->sd_log_flush_head
== sdp
->sd_jdesc
->jd_blocks
) {
455 sdp
->sd_log_flush_head
= 0;
456 sdp
->sd_log_flush_wrapped
= 1;
461 * gfs2_log_get_buf - Get and initialize a buffer to use for log control data
462 * @sdp: The GFS2 superblock
464 * Returns: the buffer_head
467 struct buffer_head
*gfs2_log_get_buf(struct gfs2_sbd
*sdp
)
469 u64 blkno
= log_bmap(sdp
, sdp
->sd_log_flush_head
);
470 struct gfs2_log_buf
*lb
;
471 struct buffer_head
*bh
;
473 lb
= kzalloc(sizeof(struct gfs2_log_buf
), GFP_NOFS
| __GFP_NOFAIL
);
474 list_add(&lb
->lb_list
, &sdp
->sd_log_flush_list
);
476 bh
= lb
->lb_bh
= sb_getblk(sdp
->sd_vfs
, blkno
);
478 memset(bh
->b_data
, 0, bh
->b_size
);
479 set_buffer_uptodate(bh
);
480 clear_buffer_dirty(bh
);
489 * gfs2_log_fake_buf - Build a fake buffer head to write metadata buffer to log
490 * @sdp: the filesystem
491 * @data: the data the buffer_head should point to
493 * Returns: the log buffer descriptor
496 struct buffer_head
*gfs2_log_fake_buf(struct gfs2_sbd
*sdp
,
497 struct buffer_head
*real
)
499 u64 blkno
= log_bmap(sdp
, sdp
->sd_log_flush_head
);
500 struct gfs2_log_buf
*lb
;
501 struct buffer_head
*bh
;
503 lb
= kzalloc(sizeof(struct gfs2_log_buf
), GFP_NOFS
| __GFP_NOFAIL
);
504 list_add(&lb
->lb_list
, &sdp
->sd_log_flush_list
);
507 bh
= lb
->lb_bh
= alloc_buffer_head(GFP_NOFS
| __GFP_NOFAIL
);
508 atomic_set(&bh
->b_count
, 1);
509 bh
->b_state
= (1 << BH_Mapped
) | (1 << BH_Uptodate
);
510 set_bh_page(bh
, real
->b_page
, bh_offset(real
));
511 bh
->b_blocknr
= blkno
;
512 bh
->b_size
= sdp
->sd_sb
.sb_bsize
;
513 bh
->b_bdev
= sdp
->sd_vfs
->s_bdev
;
520 static void log_pull_tail(struct gfs2_sbd
*sdp
, unsigned int new_tail
)
522 unsigned int dist
= log_distance(sdp
, new_tail
, sdp
->sd_log_tail
);
524 ail2_empty(sdp
, new_tail
);
527 sdp
->sd_log_blks_free
+= dist
;
528 gfs2_assert_withdraw(sdp
, sdp
->sd_log_blks_free
<= sdp
->sd_jdesc
->jd_blocks
);
529 gfs2_log_unlock(sdp
);
531 sdp
->sd_log_tail
= new_tail
;
535 * log_write_header - Get and initialize a journal header buffer
536 * @sdp: The GFS2 superblock
538 * Returns: the initialized log buffer descriptor
541 static void log_write_header(struct gfs2_sbd
*sdp
, u32 flags
, int pull
)
543 u64 blkno
= log_bmap(sdp
, sdp
->sd_log_flush_head
);
544 struct buffer_head
*bh
;
545 struct gfs2_log_header
*lh
;
549 bh
= sb_getblk(sdp
->sd_vfs
, blkno
);
551 memset(bh
->b_data
, 0, bh
->b_size
);
552 set_buffer_uptodate(bh
);
553 clear_buffer_dirty(bh
);
556 gfs2_ail1_empty(sdp
, 0);
557 tail
= current_tail(sdp
);
559 lh
= (struct gfs2_log_header
*)bh
->b_data
;
560 memset(lh
, 0, sizeof(struct gfs2_log_header
));
561 lh
->lh_header
.mh_magic
= cpu_to_be32(GFS2_MAGIC
);
562 lh
->lh_header
.mh_type
= cpu_to_be32(GFS2_METATYPE_LH
);
563 lh
->lh_header
.mh_format
= cpu_to_be32(GFS2_FORMAT_LH
);
564 lh
->lh_sequence
= cpu_to_be64(sdp
->sd_log_sequence
++);
565 lh
->lh_flags
= cpu_to_be32(flags
);
566 lh
->lh_tail
= cpu_to_be32(tail
);
567 lh
->lh_blkno
= cpu_to_be32(sdp
->sd_log_flush_head
);
568 hash
= gfs2_disk_hash(bh
->b_data
, sizeof(struct gfs2_log_header
));
569 lh
->lh_hash
= cpu_to_be32(hash
);
571 set_buffer_dirty(bh
);
572 if (sync_dirty_buffer(bh
))
573 gfs2_io_error_bh(sdp
, bh
);
576 if (sdp
->sd_log_tail
!= tail
)
577 log_pull_tail(sdp
, tail
);
579 gfs2_assert_withdraw(sdp
, !pull
);
581 sdp
->sd_log_idle
= (tail
== sdp
->sd_log_flush_head
);
585 static void log_flush_commit(struct gfs2_sbd
*sdp
)
587 struct list_head
*head
= &sdp
->sd_log_flush_list
;
588 struct gfs2_log_buf
*lb
;
589 struct buffer_head
*bh
;
592 while (!list_empty(head
)) {
593 lb
= list_entry(head
->next
, struct gfs2_log_buf
, lb_list
);
594 list_del(&lb
->lb_list
);
598 if (!buffer_uptodate(bh
))
599 gfs2_io_error_bh(sdp
, bh
);
601 while (atomic_read(&bh
->b_count
) != 1) /* Grrrr... */
603 free_buffer_head(bh
);
610 /* If nothing was journaled, the header is unplanned and unwanted. */
612 log_write_header(sdp
, 0, 0);
615 tail
= current_tail(sdp
);
617 gfs2_ail1_empty(sdp
, 0);
618 if (sdp
->sd_log_tail
!= tail
)
619 log_pull_tail(sdp
, tail
);
623 static void gfs2_ordered_write(struct gfs2_sbd
*sdp
)
625 struct gfs2_bufdata
*bd
;
626 struct buffer_head
*bh
;
630 while (!list_empty(&sdp
->sd_log_le_ordered
)) {
631 bd
= list_entry(sdp
->sd_log_le_ordered
.next
, struct gfs2_bufdata
, bd_le
.le_list
);
632 list_move(&bd
->bd_le
.le_list
, &written
);
634 if (!buffer_dirty(bh
))
637 gfs2_log_unlock(sdp
);
639 if (test_clear_buffer_dirty(bh
)) {
640 bh
->b_end_io
= end_buffer_write_sync
;
641 submit_bh(WRITE
, bh
);
648 list_splice(&written
, &sdp
->sd_log_le_ordered
);
649 gfs2_log_unlock(sdp
);
652 static void gfs2_ordered_wait(struct gfs2_sbd
*sdp
)
654 struct gfs2_bufdata
*bd
;
655 struct buffer_head
*bh
;
658 while (!list_empty(&sdp
->sd_log_le_ordered
)) {
659 bd
= list_entry(sdp
->sd_log_le_ordered
.prev
, struct gfs2_bufdata
, bd_le
.le_list
);
661 if (buffer_locked(bh
)) {
663 gfs2_log_unlock(sdp
);
669 list_del_init(&bd
->bd_le
.le_list
);
671 gfs2_log_unlock(sdp
);
675 * gfs2_log_flush - flush incore transaction(s)
676 * @sdp: the filesystem
677 * @gl: The glock structure to flush. If NULL, flush the whole incore log
681 void gfs2_log_flush(struct gfs2_sbd
*sdp
, struct gfs2_glock
*gl
)
685 down_write(&sdp
->sd_log_flush_lock
);
689 if (list_empty(&gl
->gl_le
.le_list
)) {
690 gfs2_log_unlock(sdp
);
691 up_write(&sdp
->sd_log_flush_lock
);
694 gfs2_log_unlock(sdp
);
697 ai
= kzalloc(sizeof(struct gfs2_ail
), GFP_NOFS
| __GFP_NOFAIL
);
698 INIT_LIST_HEAD(&ai
->ai_ail1_list
);
699 INIT_LIST_HEAD(&ai
->ai_ail2_list
);
701 gfs2_assert_withdraw(sdp
,
702 sdp
->sd_log_num_buf
+ sdp
->sd_log_num_databuf
==
703 sdp
->sd_log_commited_buf
+
704 sdp
->sd_log_commited_databuf
);
705 gfs2_assert_withdraw(sdp
,
706 sdp
->sd_log_num_revoke
== sdp
->sd_log_commited_revoke
);
708 sdp
->sd_log_flush_head
= sdp
->sd_log_head
;
709 sdp
->sd_log_flush_wrapped
= 0;
710 ai
->ai_first
= sdp
->sd_log_flush_head
;
712 gfs2_ordered_write(sdp
);
713 lops_before_commit(sdp
);
714 gfs2_ordered_wait(sdp
);
716 if (!list_empty(&sdp
->sd_log_flush_list
))
717 log_flush_commit(sdp
);
718 else if (sdp
->sd_log_tail
!= current_tail(sdp
) && !sdp
->sd_log_idle
){
720 sdp
->sd_log_blks_free
--; /* Adjust for unreserved buffer */
721 gfs2_log_unlock(sdp
);
722 log_write_header(sdp
, 0, PULL
);
724 lops_after_commit(sdp
, ai
);
727 sdp
->sd_log_head
= sdp
->sd_log_flush_head
;
728 sdp
->sd_log_blks_reserved
= 0;
729 sdp
->sd_log_commited_buf
= 0;
730 sdp
->sd_log_commited_databuf
= 0;
731 sdp
->sd_log_commited_revoke
= 0;
733 if (!list_empty(&ai
->ai_ail1_list
)) {
734 list_add(&ai
->ai_list
, &sdp
->sd_ail1_list
);
737 gfs2_log_unlock(sdp
);
739 sdp
->sd_vfs
->s_dirt
= 0;
740 up_write(&sdp
->sd_log_flush_lock
);
745 static void log_refund(struct gfs2_sbd
*sdp
, struct gfs2_trans
*tr
)
747 unsigned int reserved
;
752 sdp
->sd_log_commited_buf
+= tr
->tr_num_buf_new
- tr
->tr_num_buf_rm
;
753 sdp
->sd_log_commited_databuf
+= tr
->tr_num_databuf_new
-
754 tr
->tr_num_databuf_rm
;
755 gfs2_assert_withdraw(sdp
, (((int)sdp
->sd_log_commited_buf
) >= 0) ||
756 (((int)sdp
->sd_log_commited_databuf
) >= 0));
757 sdp
->sd_log_commited_revoke
+= tr
->tr_num_revoke
- tr
->tr_num_revoke_rm
;
758 gfs2_assert_withdraw(sdp
, ((int)sdp
->sd_log_commited_revoke
) >= 0);
759 reserved
= calc_reserved(sdp
);
760 old
= sdp
->sd_log_blks_free
;
761 sdp
->sd_log_blks_free
+= tr
->tr_reserved
-
762 (reserved
- sdp
->sd_log_blks_reserved
);
764 gfs2_assert_withdraw(sdp
, sdp
->sd_log_blks_free
>= old
);
765 gfs2_assert_withdraw(sdp
, sdp
->sd_log_blks_free
<=
766 sdp
->sd_jdesc
->jd_blocks
);
768 sdp
->sd_log_blks_reserved
= reserved
;
770 gfs2_log_unlock(sdp
);
774 * gfs2_log_commit - Commit a transaction to the log
775 * @sdp: the filesystem
776 * @tr: the transaction
781 void gfs2_log_commit(struct gfs2_sbd
*sdp
, struct gfs2_trans
*tr
)
784 lops_incore_commit(sdp
, tr
);
786 sdp
->sd_vfs
->s_dirt
= 1;
787 up_read(&sdp
->sd_log_flush_lock
);
790 if (sdp
->sd_log_num_buf
> gfs2_tune_get(sdp
, gt_incore_log_blocks
))
791 wake_up_process(sdp
->sd_logd_process
);
792 gfs2_log_unlock(sdp
);
796 * gfs2_log_shutdown - write a shutdown header into a journal
797 * @sdp: the filesystem
801 void gfs2_log_shutdown(struct gfs2_sbd
*sdp
)
803 down_write(&sdp
->sd_log_flush_lock
);
805 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_blks_reserved
);
806 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_num_gl
);
807 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_num_buf
);
808 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_num_revoke
);
809 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_num_rg
);
810 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_num_databuf
);
811 gfs2_assert_withdraw(sdp
, list_empty(&sdp
->sd_ail1_list
));
813 sdp
->sd_log_flush_head
= sdp
->sd_log_head
;
814 sdp
->sd_log_flush_wrapped
= 0;
816 log_write_header(sdp
, GFS2_LOG_HEAD_UNMOUNT
,
817 (sdp
->sd_log_tail
== current_tail(sdp
)) ? 0 : PULL
);
819 gfs2_assert_warn(sdp
, sdp
->sd_log_blks_free
== sdp
->sd_jdesc
->jd_blocks
);
820 gfs2_assert_warn(sdp
, sdp
->sd_log_head
== sdp
->sd_log_tail
);
821 gfs2_assert_warn(sdp
, list_empty(&sdp
->sd_ail2_list
));
823 sdp
->sd_log_head
= sdp
->sd_log_flush_head
;
824 sdp
->sd_log_tail
= sdp
->sd_log_head
;
826 up_write(&sdp
->sd_log_flush_lock
);
831 * gfs2_meta_syncfs - sync all the buffers in a filesystem
832 * @sdp: the filesystem
836 void gfs2_meta_syncfs(struct gfs2_sbd
*sdp
)
838 gfs2_log_flush(sdp
, NULL
);
840 gfs2_ail1_start(sdp
, DIO_ALL
);
841 if (gfs2_ail1_empty(sdp
, DIO_ALL
))
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