2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2007 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/delay.h>
18 #include <linux/kthread.h>
19 #include <linux/freezer.h>
20 #include <linux/bio.h>
31 #include "trace_gfs2.h"
36 * gfs2_struct2blk - compute stuff
37 * @sdp: the filesystem
38 * @nstruct: the number of structures
39 * @ssize: the size of the structures
41 * Compute the number of log descriptor blocks needed to hold a certain number
42 * of structures of a certain size.
44 * Returns: the number of blocks needed (minimum is always 1)
47 unsigned int gfs2_struct2blk(struct gfs2_sbd
*sdp
, unsigned int nstruct
,
51 unsigned int first
, second
;
54 first
= (sdp
->sd_sb
.sb_bsize
- sizeof(struct gfs2_log_descriptor
)) / ssize
;
56 if (nstruct
> first
) {
57 second
= (sdp
->sd_sb
.sb_bsize
-
58 sizeof(struct gfs2_meta_header
)) / ssize
;
59 blks
+= DIV_ROUND_UP(nstruct
- first
, second
);
66 * gfs2_remove_from_ail - Remove an entry from the ail lists, updating counters
67 * @mapping: The associated mapping (maybe NULL)
68 * @bd: The gfs2_bufdata to remove
70 * The log lock _must_ be held when calling this function
74 void gfs2_remove_from_ail(struct gfs2_bufdata
*bd
)
77 list_del_init(&bd
->bd_ail_st_list
);
78 list_del_init(&bd
->bd_ail_gl_list
);
79 atomic_dec(&bd
->bd_gl
->gl_ail_count
);
84 * gfs2_ail1_start_one - Start I/O on a part of the AIL
85 * @sdp: the filesystem
86 * @tr: the part of the AIL
90 static void gfs2_ail1_start_one(struct gfs2_sbd
*sdp
, struct gfs2_ail
*ai
)
91 __releases(&sdp
->sd_log_lock
)
92 __acquires(&sdp
->sd_log_lock
)
94 struct gfs2_bufdata
*bd
, *s
;
95 struct buffer_head
*bh
;
101 list_for_each_entry_safe_reverse(bd
, s
, &ai
->ai_ail1_list
,
105 gfs2_assert(sdp
, bd
->bd_ail
== ai
);
107 if (!buffer_busy(bh
)) {
108 if (!buffer_uptodate(bh
))
109 gfs2_io_error_bh(sdp
, bh
);
110 list_move(&bd
->bd_ail_st_list
, &ai
->ai_ail2_list
);
114 if (!buffer_dirty(bh
))
117 list_move(&bd
->bd_ail_st_list
, &ai
->ai_ail1_list
);
120 gfs2_log_unlock(sdp
);
122 if (test_clear_buffer_dirty(bh
)) {
123 bh
->b_end_io
= end_buffer_write_sync
;
124 submit_bh(WRITE_SYNC_PLUG
, bh
);
138 * gfs2_ail1_empty_one - Check whether or not a trans in the AIL has been synced
139 * @sdp: the filesystem
144 static int gfs2_ail1_empty_one(struct gfs2_sbd
*sdp
, struct gfs2_ail
*ai
, int flags
)
146 struct gfs2_bufdata
*bd
, *s
;
147 struct buffer_head
*bh
;
149 list_for_each_entry_safe_reverse(bd
, s
, &ai
->ai_ail1_list
,
153 gfs2_assert(sdp
, bd
->bd_ail
== ai
);
155 if (buffer_busy(bh
)) {
162 if (!buffer_uptodate(bh
))
163 gfs2_io_error_bh(sdp
, bh
);
165 list_move(&bd
->bd_ail_st_list
, &ai
->ai_ail2_list
);
168 return list_empty(&ai
->ai_ail1_list
);
171 static void gfs2_ail1_start(struct gfs2_sbd
*sdp
)
173 struct list_head
*head
;
179 head
= &sdp
->sd_ail1_list
;
180 if (list_empty(head
)) {
181 gfs2_log_unlock(sdp
);
184 sync_gen
= sdp
->sd_ail_sync_gen
++;
188 list_for_each_entry_reverse(ai
, head
, ai_list
) {
189 if (ai
->ai_sync_gen
>= sync_gen
)
191 ai
->ai_sync_gen
= sync_gen
;
192 gfs2_ail1_start_one(sdp
, ai
); /* This may drop log lock */
198 gfs2_log_unlock(sdp
);
201 static int gfs2_ail1_empty(struct gfs2_sbd
*sdp
, int flags
)
203 struct gfs2_ail
*ai
, *s
;
208 list_for_each_entry_safe_reverse(ai
, s
, &sdp
->sd_ail1_list
, ai_list
) {
209 if (gfs2_ail1_empty_one(sdp
, ai
, flags
))
210 list_move(&ai
->ai_list
, &sdp
->sd_ail2_list
);
211 else if (!(flags
& DIO_ALL
))
215 ret
= list_empty(&sdp
->sd_ail1_list
);
217 gfs2_log_unlock(sdp
);
224 * gfs2_ail2_empty_one - Check whether or not a trans in the AIL has been synced
225 * @sdp: the filesystem
230 static void gfs2_ail2_empty_one(struct gfs2_sbd
*sdp
, struct gfs2_ail
*ai
)
232 struct list_head
*head
= &ai
->ai_ail2_list
;
233 struct gfs2_bufdata
*bd
;
235 while (!list_empty(head
)) {
236 bd
= list_entry(head
->prev
, struct gfs2_bufdata
,
238 gfs2_assert(sdp
, bd
->bd_ail
== ai
);
239 gfs2_remove_from_ail(bd
);
243 static void ail2_empty(struct gfs2_sbd
*sdp
, unsigned int new_tail
)
245 struct gfs2_ail
*ai
, *safe
;
246 unsigned int old_tail
= sdp
->sd_log_tail
;
247 int wrap
= (new_tail
< old_tail
);
252 list_for_each_entry_safe(ai
, safe
, &sdp
->sd_ail2_list
, ai_list
) {
253 a
= (old_tail
<= ai
->ai_first
);
254 b
= (ai
->ai_first
< new_tail
);
255 rm
= (wrap
) ? (a
|| b
) : (a
&& b
);
259 gfs2_ail2_empty_one(sdp
, ai
);
260 list_del(&ai
->ai_list
);
261 gfs2_assert_warn(sdp
, list_empty(&ai
->ai_ail1_list
));
262 gfs2_assert_warn(sdp
, list_empty(&ai
->ai_ail2_list
));
266 gfs2_log_unlock(sdp
);
270 * gfs2_log_reserve - Make a log reservation
271 * @sdp: The GFS2 superblock
272 * @blks: The number of blocks to reserve
274 * Note that we never give out the last few blocks of the journal. Thats
275 * due to the fact that there is a small number of header blocks
276 * associated with each log flush. The exact number can't be known until
277 * flush time, so we ensure that we have just enough free blocks at all
278 * times to avoid running out during a log flush.
280 * We no longer flush the log here, instead we wake up logd to do that
281 * for us. To avoid the thundering herd and to ensure that we deal fairly
282 * with queued waiters, we use an exclusive wait. This means that when we
283 * get woken with enough journal space to get our reservation, we need to
284 * wake the next waiter on the list.
289 int gfs2_log_reserve(struct gfs2_sbd
*sdp
, unsigned int blks
)
291 unsigned reserved_blks
= 6 * (4096 / sdp
->sd_vfs
->s_blocksize
);
292 unsigned wanted
= blks
+ reserved_blks
;
295 unsigned int free_blocks
;
297 if (gfs2_assert_warn(sdp
, blks
) ||
298 gfs2_assert_warn(sdp
, blks
<= sdp
->sd_jdesc
->jd_blocks
))
301 free_blocks
= atomic_read(&sdp
->sd_log_blks_free
);
302 if (unlikely(free_blocks
<= wanted
)) {
304 prepare_to_wait_exclusive(&sdp
->sd_log_waitq
, &wait
,
305 TASK_UNINTERRUPTIBLE
);
306 wake_up(&sdp
->sd_logd_waitq
);
308 if (atomic_read(&sdp
->sd_log_blks_free
) <= wanted
)
310 free_blocks
= atomic_read(&sdp
->sd_log_blks_free
);
311 } while(free_blocks
<= wanted
);
312 finish_wait(&sdp
->sd_log_waitq
, &wait
);
314 if (atomic_cmpxchg(&sdp
->sd_log_blks_free
, free_blocks
,
315 free_blocks
- blks
) != free_blocks
)
317 trace_gfs2_log_blocks(sdp
, -blks
);
320 * If we waited, then so might others, wake them up _after_ we get
321 * our share of the log.
323 if (unlikely(did_wait
))
324 wake_up(&sdp
->sd_log_waitq
);
326 down_read(&sdp
->sd_log_flush_lock
);
331 static u64
log_bmap(struct gfs2_sbd
*sdp
, unsigned int lbn
)
333 struct gfs2_journal_extent
*je
;
335 list_for_each_entry(je
, &sdp
->sd_jdesc
->extent_list
, extent_list
) {
336 if (lbn
>= je
->lblock
&& lbn
< je
->lblock
+ je
->blocks
)
337 return je
->dblock
+ lbn
- je
->lblock
;
344 * log_distance - Compute distance between two journal blocks
345 * @sdp: The GFS2 superblock
346 * @newer: The most recent journal block of the pair
347 * @older: The older journal block of the pair
349 * Compute the distance (in the journal direction) between two
350 * blocks in the journal
352 * Returns: the distance in blocks
355 static inline unsigned int log_distance(struct gfs2_sbd
*sdp
, unsigned int newer
,
360 dist
= newer
- older
;
362 dist
+= sdp
->sd_jdesc
->jd_blocks
;
368 * calc_reserved - Calculate the number of blocks to reserve when
369 * refunding a transaction's unused buffers.
370 * @sdp: The GFS2 superblock
372 * This is complex. We need to reserve room for all our currently used
373 * metadata buffers (e.g. normal file I/O rewriting file time stamps) and
374 * all our journaled data buffers for journaled files (e.g. files in the
375 * meta_fs like rindex, or files for which chattr +j was done.)
376 * If we don't reserve enough space, gfs2_log_refund and gfs2_log_flush
377 * will count it as free space (sd_log_blks_free) and corruption will follow.
379 * We can have metadata bufs and jdata bufs in the same journal. So each
380 * type gets its own log header, for which we need to reserve a block.
381 * In fact, each type has the potential for needing more than one header
382 * in cases where we have more buffers than will fit on a journal page.
383 * Metadata journal entries take up half the space of journaled buffer entries.
384 * Thus, metadata entries have buf_limit (502) and journaled buffers have
385 * databuf_limit (251) before they cause a wrap around.
387 * Also, we need to reserve blocks for revoke journal entries and one for an
388 * overall header for the lot.
390 * Returns: the number of blocks reserved
392 static unsigned int calc_reserved(struct gfs2_sbd
*sdp
)
394 unsigned int reserved
= 0;
395 unsigned int mbuf_limit
, metabufhdrs_needed
;
396 unsigned int dbuf_limit
, databufhdrs_needed
;
397 unsigned int revokes
= 0;
399 mbuf_limit
= buf_limit(sdp
);
400 metabufhdrs_needed
= (sdp
->sd_log_commited_buf
+
401 (mbuf_limit
- 1)) / mbuf_limit
;
402 dbuf_limit
= databuf_limit(sdp
);
403 databufhdrs_needed
= (sdp
->sd_log_commited_databuf
+
404 (dbuf_limit
- 1)) / dbuf_limit
;
406 if (sdp
->sd_log_commited_revoke
> 0)
407 revokes
= gfs2_struct2blk(sdp
, sdp
->sd_log_commited_revoke
,
410 reserved
= sdp
->sd_log_commited_buf
+ metabufhdrs_needed
+
411 sdp
->sd_log_commited_databuf
+ databufhdrs_needed
+
413 /* One for the overall header */
419 static unsigned int current_tail(struct gfs2_sbd
*sdp
)
426 if (list_empty(&sdp
->sd_ail1_list
)) {
427 tail
= sdp
->sd_log_head
;
429 ai
= list_entry(sdp
->sd_ail1_list
.prev
, struct gfs2_ail
, ai_list
);
433 gfs2_log_unlock(sdp
);
438 void gfs2_log_incr_head(struct gfs2_sbd
*sdp
)
440 if (sdp
->sd_log_flush_head
== sdp
->sd_log_tail
)
441 BUG_ON(sdp
->sd_log_flush_head
!= sdp
->sd_log_head
);
443 if (++sdp
->sd_log_flush_head
== sdp
->sd_jdesc
->jd_blocks
) {
444 sdp
->sd_log_flush_head
= 0;
445 sdp
->sd_log_flush_wrapped
= 1;
450 * gfs2_log_write_endio - End of I/O for a log buffer
451 * @bh: The buffer head
452 * @uptodate: I/O Status
456 static void gfs2_log_write_endio(struct buffer_head
*bh
, int uptodate
)
458 struct gfs2_sbd
*sdp
= bh
->b_private
;
459 bh
->b_private
= NULL
;
461 end_buffer_write_sync(bh
, uptodate
);
462 if (atomic_dec_and_test(&sdp
->sd_log_in_flight
))
463 wake_up(&sdp
->sd_log_flush_wait
);
467 * gfs2_log_get_buf - Get and initialize a buffer to use for log control data
468 * @sdp: The GFS2 superblock
470 * Returns: the buffer_head
473 struct buffer_head
*gfs2_log_get_buf(struct gfs2_sbd
*sdp
)
475 u64 blkno
= log_bmap(sdp
, sdp
->sd_log_flush_head
);
476 struct buffer_head
*bh
;
478 bh
= sb_getblk(sdp
->sd_vfs
, blkno
);
480 memset(bh
->b_data
, 0, bh
->b_size
);
481 set_buffer_uptodate(bh
);
482 clear_buffer_dirty(bh
);
483 gfs2_log_incr_head(sdp
);
484 atomic_inc(&sdp
->sd_log_in_flight
);
486 bh
->b_end_io
= gfs2_log_write_endio
;
492 * gfs2_fake_write_endio -
493 * @bh: The buffer head
494 * @uptodate: The I/O Status
498 static void gfs2_fake_write_endio(struct buffer_head
*bh
, int uptodate
)
500 struct buffer_head
*real_bh
= bh
->b_private
;
501 struct gfs2_bufdata
*bd
= real_bh
->b_private
;
502 struct gfs2_sbd
*sdp
= bd
->bd_gl
->gl_sbd
;
504 end_buffer_write_sync(bh
, uptodate
);
505 free_buffer_head(bh
);
506 unlock_buffer(real_bh
);
508 if (atomic_dec_and_test(&sdp
->sd_log_in_flight
))
509 wake_up(&sdp
->sd_log_flush_wait
);
513 * gfs2_log_fake_buf - Build a fake buffer head to write metadata buffer to log
514 * @sdp: the filesystem
515 * @data: the data the buffer_head should point to
517 * Returns: the log buffer descriptor
520 struct buffer_head
*gfs2_log_fake_buf(struct gfs2_sbd
*sdp
,
521 struct buffer_head
*real
)
523 u64 blkno
= log_bmap(sdp
, sdp
->sd_log_flush_head
);
524 struct buffer_head
*bh
;
526 bh
= alloc_buffer_head(GFP_NOFS
| __GFP_NOFAIL
);
527 atomic_set(&bh
->b_count
, 1);
528 bh
->b_state
= (1 << BH_Mapped
) | (1 << BH_Uptodate
) | (1 << BH_Lock
);
529 set_bh_page(bh
, real
->b_page
, bh_offset(real
));
530 bh
->b_blocknr
= blkno
;
531 bh
->b_size
= sdp
->sd_sb
.sb_bsize
;
532 bh
->b_bdev
= sdp
->sd_vfs
->s_bdev
;
533 bh
->b_private
= real
;
534 bh
->b_end_io
= gfs2_fake_write_endio
;
536 gfs2_log_incr_head(sdp
);
537 atomic_inc(&sdp
->sd_log_in_flight
);
542 static void log_pull_tail(struct gfs2_sbd
*sdp
, unsigned int new_tail
)
544 unsigned int dist
= log_distance(sdp
, new_tail
, sdp
->sd_log_tail
);
546 ail2_empty(sdp
, new_tail
);
548 atomic_add(dist
, &sdp
->sd_log_blks_free
);
549 trace_gfs2_log_blocks(sdp
, dist
);
550 gfs2_assert_withdraw(sdp
, atomic_read(&sdp
->sd_log_blks_free
) <=
551 sdp
->sd_jdesc
->jd_blocks
);
553 sdp
->sd_log_tail
= new_tail
;
557 * log_write_header - Get and initialize a journal header buffer
558 * @sdp: The GFS2 superblock
560 * Returns: the initialized log buffer descriptor
563 static void log_write_header(struct gfs2_sbd
*sdp
, u32 flags
, int pull
)
565 u64 blkno
= log_bmap(sdp
, sdp
->sd_log_flush_head
);
566 struct buffer_head
*bh
;
567 struct gfs2_log_header
*lh
;
571 bh
= sb_getblk(sdp
->sd_vfs
, blkno
);
573 memset(bh
->b_data
, 0, bh
->b_size
);
574 set_buffer_uptodate(bh
);
575 clear_buffer_dirty(bh
);
577 gfs2_ail1_empty(sdp
, 0);
578 tail
= current_tail(sdp
);
580 lh
= (struct gfs2_log_header
*)bh
->b_data
;
581 memset(lh
, 0, sizeof(struct gfs2_log_header
));
582 lh
->lh_header
.mh_magic
= cpu_to_be32(GFS2_MAGIC
);
583 lh
->lh_header
.mh_type
= cpu_to_be32(GFS2_METATYPE_LH
);
584 lh
->lh_header
.__pad0
= cpu_to_be64(0);
585 lh
->lh_header
.mh_format
= cpu_to_be32(GFS2_FORMAT_LH
);
586 lh
->lh_header
.mh_jid
= cpu_to_be32(sdp
->sd_jdesc
->jd_jid
);
587 lh
->lh_sequence
= cpu_to_be64(sdp
->sd_log_sequence
++);
588 lh
->lh_flags
= cpu_to_be32(flags
);
589 lh
->lh_tail
= cpu_to_be32(tail
);
590 lh
->lh_blkno
= cpu_to_be32(sdp
->sd_log_flush_head
);
591 hash
= gfs2_disk_hash(bh
->b_data
, sizeof(struct gfs2_log_header
));
592 lh
->lh_hash
= cpu_to_be32(hash
);
594 bh
->b_end_io
= end_buffer_write_sync
;
596 if (test_bit(SDF_NOBARRIERS
, &sdp
->sd_flags
))
597 submit_bh(WRITE_SYNC
| REQ_META
, bh
);
599 submit_bh(WRITE_FLUSH_FUA
| REQ_META
, bh
);
602 if (!buffer_uptodate(bh
))
603 gfs2_io_error_bh(sdp
, bh
);
606 if (sdp
->sd_log_tail
!= tail
)
607 log_pull_tail(sdp
, tail
);
609 gfs2_assert_withdraw(sdp
, !pull
);
611 sdp
->sd_log_idle
= (tail
== sdp
->sd_log_flush_head
);
612 gfs2_log_incr_head(sdp
);
615 static void log_flush_commit(struct gfs2_sbd
*sdp
)
619 if (atomic_read(&sdp
->sd_log_in_flight
)) {
621 prepare_to_wait(&sdp
->sd_log_flush_wait
, &wait
,
622 TASK_UNINTERRUPTIBLE
);
623 if (atomic_read(&sdp
->sd_log_in_flight
))
625 } while(atomic_read(&sdp
->sd_log_in_flight
));
626 finish_wait(&sdp
->sd_log_flush_wait
, &wait
);
629 log_write_header(sdp
, 0, 0);
632 static void gfs2_ordered_write(struct gfs2_sbd
*sdp
)
634 struct gfs2_bufdata
*bd
;
635 struct buffer_head
*bh
;
639 while (!list_empty(&sdp
->sd_log_le_ordered
)) {
640 bd
= list_entry(sdp
->sd_log_le_ordered
.next
, struct gfs2_bufdata
, bd_le
.le_list
);
641 list_move(&bd
->bd_le
.le_list
, &written
);
643 if (!buffer_dirty(bh
))
646 gfs2_log_unlock(sdp
);
648 if (buffer_mapped(bh
) && test_clear_buffer_dirty(bh
)) {
649 bh
->b_end_io
= end_buffer_write_sync
;
650 submit_bh(WRITE_SYNC_PLUG
, bh
);
657 list_splice(&written
, &sdp
->sd_log_le_ordered
);
658 gfs2_log_unlock(sdp
);
661 static void gfs2_ordered_wait(struct gfs2_sbd
*sdp
)
663 struct gfs2_bufdata
*bd
;
664 struct buffer_head
*bh
;
667 while (!list_empty(&sdp
->sd_log_le_ordered
)) {
668 bd
= list_entry(sdp
->sd_log_le_ordered
.prev
, struct gfs2_bufdata
, bd_le
.le_list
);
670 if (buffer_locked(bh
)) {
672 gfs2_log_unlock(sdp
);
678 list_del_init(&bd
->bd_le
.le_list
);
680 gfs2_log_unlock(sdp
);
684 * gfs2_log_flush - flush incore transaction(s)
685 * @sdp: the filesystem
686 * @gl: The glock structure to flush. If NULL, flush the whole incore log
690 void gfs2_log_flush(struct gfs2_sbd
*sdp
, struct gfs2_glock
*gl
)
694 down_write(&sdp
->sd_log_flush_lock
);
696 /* Log might have been flushed while we waited for the flush lock */
697 if (gl
&& !test_bit(GLF_LFLUSH
, &gl
->gl_flags
)) {
698 up_write(&sdp
->sd_log_flush_lock
);
701 trace_gfs2_log_flush(sdp
, 1);
703 ai
= kzalloc(sizeof(struct gfs2_ail
), GFP_NOFS
| __GFP_NOFAIL
);
704 INIT_LIST_HEAD(&ai
->ai_ail1_list
);
705 INIT_LIST_HEAD(&ai
->ai_ail2_list
);
707 if (sdp
->sd_log_num_buf
!= sdp
->sd_log_commited_buf
) {
708 printk(KERN_INFO
"GFS2: log buf %u %u\n", sdp
->sd_log_num_buf
,
709 sdp
->sd_log_commited_buf
);
710 gfs2_assert_withdraw(sdp
, 0);
712 if (sdp
->sd_log_num_databuf
!= sdp
->sd_log_commited_databuf
) {
713 printk(KERN_INFO
"GFS2: log databuf %u %u\n",
714 sdp
->sd_log_num_databuf
, sdp
->sd_log_commited_databuf
);
715 gfs2_assert_withdraw(sdp
, 0);
717 gfs2_assert_withdraw(sdp
,
718 sdp
->sd_log_num_revoke
== sdp
->sd_log_commited_revoke
);
720 sdp
->sd_log_flush_head
= sdp
->sd_log_head
;
721 sdp
->sd_log_flush_wrapped
= 0;
722 ai
->ai_first
= sdp
->sd_log_flush_head
;
724 gfs2_ordered_write(sdp
);
725 lops_before_commit(sdp
);
726 gfs2_ordered_wait(sdp
);
728 if (sdp
->sd_log_head
!= sdp
->sd_log_flush_head
)
729 log_flush_commit(sdp
);
730 else if (sdp
->sd_log_tail
!= current_tail(sdp
) && !sdp
->sd_log_idle
){
732 atomic_dec(&sdp
->sd_log_blks_free
); /* Adjust for unreserved buffer */
733 trace_gfs2_log_blocks(sdp
, -1);
734 gfs2_log_unlock(sdp
);
735 log_write_header(sdp
, 0, PULL
);
737 lops_after_commit(sdp
, ai
);
740 sdp
->sd_log_head
= sdp
->sd_log_flush_head
;
741 sdp
->sd_log_blks_reserved
= 0;
742 sdp
->sd_log_commited_buf
= 0;
743 sdp
->sd_log_commited_databuf
= 0;
744 sdp
->sd_log_commited_revoke
= 0;
746 if (!list_empty(&ai
->ai_ail1_list
)) {
747 list_add(&ai
->ai_list
, &sdp
->sd_ail1_list
);
750 gfs2_log_unlock(sdp
);
751 trace_gfs2_log_flush(sdp
, 0);
752 up_write(&sdp
->sd_log_flush_lock
);
757 static void log_refund(struct gfs2_sbd
*sdp
, struct gfs2_trans
*tr
)
759 unsigned int reserved
;
764 sdp
->sd_log_commited_buf
+= tr
->tr_num_buf_new
- tr
->tr_num_buf_rm
;
765 sdp
->sd_log_commited_databuf
+= tr
->tr_num_databuf_new
-
766 tr
->tr_num_databuf_rm
;
767 gfs2_assert_withdraw(sdp
, (((int)sdp
->sd_log_commited_buf
) >= 0) ||
768 (((int)sdp
->sd_log_commited_databuf
) >= 0));
769 sdp
->sd_log_commited_revoke
+= tr
->tr_num_revoke
- tr
->tr_num_revoke_rm
;
770 reserved
= calc_reserved(sdp
);
771 gfs2_assert_withdraw(sdp
, sdp
->sd_log_blks_reserved
+ tr
->tr_reserved
>= reserved
);
772 unused
= sdp
->sd_log_blks_reserved
- reserved
+ tr
->tr_reserved
;
773 atomic_add(unused
, &sdp
->sd_log_blks_free
);
774 trace_gfs2_log_blocks(sdp
, unused
);
775 gfs2_assert_withdraw(sdp
, atomic_read(&sdp
->sd_log_blks_free
) <=
776 sdp
->sd_jdesc
->jd_blocks
);
777 sdp
->sd_log_blks_reserved
= reserved
;
779 gfs2_log_unlock(sdp
);
782 static void buf_lo_incore_commit(struct gfs2_sbd
*sdp
, struct gfs2_trans
*tr
)
784 struct list_head
*head
= &tr
->tr_list_buf
;
785 struct gfs2_bufdata
*bd
;
788 while (!list_empty(head
)) {
789 bd
= list_entry(head
->next
, struct gfs2_bufdata
, bd_list_tr
);
790 list_del_init(&bd
->bd_list_tr
);
793 gfs2_log_unlock(sdp
);
794 gfs2_assert_warn(sdp
, !tr
->tr_num_buf
);
798 * gfs2_log_commit - Commit a transaction to the log
799 * @sdp: the filesystem
800 * @tr: the transaction
802 * We wake up gfs2_logd if the number of pinned blocks exceed thresh1
803 * or the total number of used blocks (pinned blocks plus AIL blocks)
804 * is greater than thresh2.
806 * At mount time thresh1 is 1/3rd of journal size, thresh2 is 2/3rd of
812 void gfs2_log_commit(struct gfs2_sbd
*sdp
, struct gfs2_trans
*tr
)
815 buf_lo_incore_commit(sdp
, tr
);
817 up_read(&sdp
->sd_log_flush_lock
);
819 if (atomic_read(&sdp
->sd_log_pinned
) > atomic_read(&sdp
->sd_log_thresh1
) ||
820 ((sdp
->sd_jdesc
->jd_blocks
- atomic_read(&sdp
->sd_log_blks_free
)) >
821 atomic_read(&sdp
->sd_log_thresh2
)))
822 wake_up(&sdp
->sd_logd_waitq
);
826 * gfs2_log_shutdown - write a shutdown header into a journal
827 * @sdp: the filesystem
831 void gfs2_log_shutdown(struct gfs2_sbd
*sdp
)
833 down_write(&sdp
->sd_log_flush_lock
);
835 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_blks_reserved
);
836 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_num_buf
);
837 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_num_revoke
);
838 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_num_rg
);
839 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_num_databuf
);
840 gfs2_assert_withdraw(sdp
, list_empty(&sdp
->sd_ail1_list
));
842 sdp
->sd_log_flush_head
= sdp
->sd_log_head
;
843 sdp
->sd_log_flush_wrapped
= 0;
845 log_write_header(sdp
, GFS2_LOG_HEAD_UNMOUNT
,
846 (sdp
->sd_log_tail
== current_tail(sdp
)) ? 0 : PULL
);
848 gfs2_assert_warn(sdp
, atomic_read(&sdp
->sd_log_blks_free
) == sdp
->sd_jdesc
->jd_blocks
);
849 gfs2_assert_warn(sdp
, sdp
->sd_log_head
== sdp
->sd_log_tail
);
850 gfs2_assert_warn(sdp
, list_empty(&sdp
->sd_ail2_list
));
852 sdp
->sd_log_head
= sdp
->sd_log_flush_head
;
853 sdp
->sd_log_tail
= sdp
->sd_log_head
;
855 up_write(&sdp
->sd_log_flush_lock
);
860 * gfs2_meta_syncfs - sync all the buffers in a filesystem
861 * @sdp: the filesystem
865 void gfs2_meta_syncfs(struct gfs2_sbd
*sdp
)
867 gfs2_log_flush(sdp
, NULL
);
869 gfs2_ail1_start(sdp
);
870 if (gfs2_ail1_empty(sdp
, DIO_ALL
))
876 static inline int gfs2_jrnl_flush_reqd(struct gfs2_sbd
*sdp
)
878 return (atomic_read(&sdp
->sd_log_pinned
) >= atomic_read(&sdp
->sd_log_thresh1
));
881 static inline int gfs2_ail_flush_reqd(struct gfs2_sbd
*sdp
)
883 unsigned int used_blocks
= sdp
->sd_jdesc
->jd_blocks
- atomic_read(&sdp
->sd_log_blks_free
);
884 return used_blocks
>= atomic_read(&sdp
->sd_log_thresh2
);
888 * gfs2_logd - Update log tail as Active Items get flushed to in-place blocks
889 * @sdp: Pointer to GFS2 superblock
891 * Also, periodically check to make sure that we're using the most recent
895 int gfs2_logd(void *data
)
897 struct gfs2_sbd
*sdp
= data
;
902 while (!kthread_should_stop()) {
904 preflush
= atomic_read(&sdp
->sd_log_pinned
);
905 if (gfs2_jrnl_flush_reqd(sdp
) || t
== 0) {
906 gfs2_ail1_empty(sdp
, DIO_ALL
);
907 gfs2_log_flush(sdp
, NULL
);
908 gfs2_ail1_empty(sdp
, DIO_ALL
);
911 if (gfs2_ail_flush_reqd(sdp
)) {
912 gfs2_ail1_start(sdp
);
914 gfs2_ail1_empty(sdp
, 0);
915 gfs2_log_flush(sdp
, NULL
);
916 gfs2_ail1_empty(sdp
, DIO_ALL
);
919 wake_up(&sdp
->sd_log_waitq
);
920 t
= gfs2_tune_get(sdp
, gt_logd_secs
) * HZ
;
921 if (freezing(current
))
925 prepare_to_wait(&sdp
->sd_logd_waitq
, &wait
,
927 if (!gfs2_ail_flush_reqd(sdp
) &&
928 !gfs2_jrnl_flush_reqd(sdp
) &&
929 !kthread_should_stop())
930 t
= schedule_timeout(t
);
931 } while(t
&& !gfs2_ail_flush_reqd(sdp
) &&
932 !gfs2_jrnl_flush_reqd(sdp
) &&
933 !kthread_should_stop());
934 finish_wait(&sdp
->sd_logd_waitq
, &wait
);
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