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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - fs/gfs2/log.c
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2005 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 v.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 <asm/semaphore.h>
20 #include "lm_interface.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
)) /
54 if (nstruct
> first
) {
55 second
= (sdp
->sd_sb
.sb_bsize
-
56 sizeof(struct gfs2_meta_header
)) / ssize
;
57 blks
+= DIV_ROUND_UP(nstruct
- first
, second
);
63 void gfs2_ail1_start(struct gfs2_sbd
*sdp
, int flags
)
65 struct list_head
*head
= &sdp
->sd_ail1_list
;
67 struct list_head
*first
, *tmp
;
68 struct gfs2_ail
*first_ai
, *ai
;
71 if (list_empty(head
)) {
75 sync_gen
= sdp
->sd_ail_sync_gen
++;
78 first_ai
= list_entry(first
, struct gfs2_ail
, ai_list
);
79 first_ai
->ai_sync_gen
= sync_gen
;
80 gfs2_ail1_start_one(sdp
, first_ai
);
86 if (first
&& (head
->prev
!= first
||
87 gfs2_ail1_empty_one(sdp
, first_ai
, 0)))
90 for (tmp
= head
->prev
; tmp
!= head
; tmp
= tmp
->prev
) {
91 ai
= list_entry(tmp
, struct gfs2_ail
, ai_list
);
92 if (ai
->ai_sync_gen
>= sync_gen
)
94 ai
->ai_sync_gen
= sync_gen
;
95 gfs2_ail1_start_one(sdp
, ai
);
103 gfs2_log_unlock(sdp
);
106 int gfs2_ail1_empty(struct gfs2_sbd
*sdp
, int flags
)
108 struct gfs2_ail
*ai
, *s
;
113 list_for_each_entry_safe_reverse(ai
, s
, &sdp
->sd_ail1_list
, ai_list
) {
114 if (gfs2_ail1_empty_one(sdp
, ai
, flags
))
115 list_move(&ai
->ai_list
, &sdp
->sd_ail2_list
);
116 else if (!(flags
& DIO_ALL
))
120 ret
= list_empty(&sdp
->sd_ail1_list
);
122 gfs2_log_unlock(sdp
);
127 static void ail2_empty(struct gfs2_sbd
*sdp
, unsigned int new_tail
)
129 struct gfs2_ail
*ai
, *safe
;
130 unsigned int old_tail
= sdp
->sd_log_tail
;
131 int wrap
= (new_tail
< old_tail
);
136 list_for_each_entry_safe(ai
, safe
, &sdp
->sd_ail2_list
, ai_list
) {
137 a
= (old_tail
<= ai
->ai_first
);
138 b
= (ai
->ai_first
< new_tail
);
139 rm
= (wrap
) ? (a
|| b
) : (a
&& b
);
143 gfs2_ail2_empty_one(sdp
, ai
);
144 list_del(&ai
->ai_list
);
145 gfs2_assert_warn(sdp
, list_empty(&ai
->ai_ail1_list
));
146 gfs2_assert_warn(sdp
, list_empty(&ai
->ai_ail2_list
));
150 gfs2_log_unlock(sdp
);
154 * gfs2_log_reserve - Make a log reservation
155 * @sdp: The GFS2 superblock
156 * @blks: The number of blocks to reserve
161 int gfs2_log_reserve(struct gfs2_sbd
*sdp
, unsigned int blks
)
163 unsigned int try = 0;
165 if (gfs2_assert_warn(sdp
, blks
) ||
166 gfs2_assert_warn(sdp
, blks
<= sdp
->sd_jdesc
->jd_blocks
))
169 mutex_lock(&sdp
->sd_log_reserve_mutex
);
171 while(sdp
->sd_log_blks_free
<= blks
) {
172 gfs2_log_unlock(sdp
);
173 gfs2_ail1_empty(sdp
, 0);
174 gfs2_log_flush(sdp
, NULL
);
177 gfs2_ail1_start(sdp
, 0);
180 sdp
->sd_log_blks_free
-= blks
;
181 /* printk(KERN_INFO "reserved %u blocks (%u left)\n", blks, sdp->sd_log_blks_free); */
182 gfs2_log_unlock(sdp
);
183 mutex_unlock(&sdp
->sd_log_reserve_mutex
);
185 down_read(&sdp
->sd_log_flush_lock
);
191 * gfs2_log_release - Release a given number of log blocks
192 * @sdp: The GFS2 superblock
193 * @blks: The number of blocks
197 void gfs2_log_release(struct gfs2_sbd
*sdp
, unsigned int blks
)
201 sdp
->sd_log_blks_free
+= blks
;
202 /* printk(KERN_INFO "released %u blocks (%u left)\n", blks, sdp->sd_log_blks_free); */
203 gfs2_assert_withdraw(sdp
,
204 sdp
->sd_log_blks_free
<= sdp
->sd_jdesc
->jd_blocks
);
205 gfs2_log_unlock(sdp
);
206 up_read(&sdp
->sd_log_flush_lock
);
209 static uint64_t log_bmap(struct gfs2_sbd
*sdp
, unsigned int lbn
)
216 error
= gfs2_block_map(sdp
->sd_jdesc
->jd_inode
, lbn
, &new, &dbn
, &bdy
);
217 gfs2_assert_withdraw(sdp
, !error
&& dbn
);
223 * log_distance - Compute distance between two journal blocks
224 * @sdp: The GFS2 superblock
225 * @newer: The most recent journal block of the pair
226 * @older: The older journal block of the pair
228 * Compute the distance (in the journal direction) between two
229 * blocks in the journal
231 * Returns: the distance in blocks
234 static inline unsigned int log_distance(struct gfs2_sbd
*sdp
,
240 dist
= newer
- older
;
242 dist
+= sdp
->sd_jdesc
->jd_blocks
;
247 static unsigned int current_tail(struct gfs2_sbd
*sdp
)
254 if (list_empty(&sdp
->sd_ail1_list
))
255 tail
= sdp
->sd_log_head
;
257 ai
= list_entry(sdp
->sd_ail1_list
.prev
,
258 struct gfs2_ail
, ai_list
);
262 gfs2_log_unlock(sdp
);
267 static inline void log_incr_head(struct gfs2_sbd
*sdp
)
269 if (sdp
->sd_log_flush_head
== sdp
->sd_log_tail
)
270 gfs2_assert_withdraw(sdp
,
271 sdp
->sd_log_flush_head
== sdp
->sd_log_head
);
273 if (++sdp
->sd_log_flush_head
== sdp
->sd_jdesc
->jd_blocks
) {
274 sdp
->sd_log_flush_head
= 0;
275 sdp
->sd_log_flush_wrapped
= 1;
280 * gfs2_log_get_buf - Get and initialize a buffer to use for log control data
281 * @sdp: The GFS2 superblock
283 * Returns: the buffer_head
286 struct buffer_head
*gfs2_log_get_buf(struct gfs2_sbd
*sdp
)
288 uint64_t blkno
= log_bmap(sdp
, sdp
->sd_log_flush_head
);
289 struct gfs2_log_buf
*lb
;
290 struct buffer_head
*bh
;
292 lb
= kzalloc(sizeof(struct gfs2_log_buf
), GFP_NOFS
| __GFP_NOFAIL
);
293 list_add(&lb
->lb_list
, &sdp
->sd_log_flush_list
);
295 bh
= lb
->lb_bh
= sb_getblk(sdp
->sd_vfs
, blkno
);
297 memset(bh
->b_data
, 0, bh
->b_size
);
298 set_buffer_uptodate(bh
);
299 clear_buffer_dirty(bh
);
308 * gfs2_log_fake_buf - Build a fake buffer head to write metadata buffer to log
309 * @sdp: the filesystem
310 * @data: the data the buffer_head should point to
312 * Returns: the log buffer descriptor
315 struct buffer_head
*gfs2_log_fake_buf(struct gfs2_sbd
*sdp
,
316 struct buffer_head
*real
)
318 uint64_t blkno
= log_bmap(sdp
, sdp
->sd_log_flush_head
);
319 struct gfs2_log_buf
*lb
;
320 struct buffer_head
*bh
;
322 lb
= kzalloc(sizeof(struct gfs2_log_buf
), GFP_NOFS
| __GFP_NOFAIL
);
323 list_add(&lb
->lb_list
, &sdp
->sd_log_flush_list
);
326 bh
= lb
->lb_bh
= alloc_buffer_head(GFP_NOFS
| __GFP_NOFAIL
);
327 atomic_set(&bh
->b_count
, 1);
328 bh
->b_state
= (1 << BH_Mapped
) | (1 << BH_Uptodate
);
329 set_bh_page(bh
, real
->b_page
, bh_offset(real
));
330 bh
->b_blocknr
= blkno
;
331 bh
->b_size
= sdp
->sd_sb
.sb_bsize
;
332 bh
->b_bdev
= sdp
->sd_vfs
->s_bdev
;
339 static void log_pull_tail(struct gfs2_sbd
*sdp
, unsigned int new_tail
, int pull
)
341 unsigned int dist
= log_distance(sdp
, new_tail
, sdp
->sd_log_tail
);
343 ail2_empty(sdp
, new_tail
);
346 sdp
->sd_log_blks_free
+= dist
- ((pull
) ? 1 : 0);
347 /* printk(KERN_INFO "pull tail refunding %u blocks (%u left) pull=%d\n", dist - ((pull) ? 1 : 0), sdp->sd_log_blks_free, pull); */
348 gfs2_assert_withdraw(sdp
,
349 sdp
->sd_log_blks_free
<= sdp
->sd_jdesc
->jd_blocks
);
350 gfs2_log_unlock(sdp
);
352 sdp
->sd_log_tail
= new_tail
;
356 * log_write_header - Get and initialize a journal header buffer
357 * @sdp: The GFS2 superblock
359 * Returns: the initialized log buffer descriptor
362 static void log_write_header(struct gfs2_sbd
*sdp
, uint32_t flags
, int pull
)
364 uint64_t blkno
= log_bmap(sdp
, sdp
->sd_log_flush_head
);
365 struct buffer_head
*bh
;
366 struct gfs2_log_header
*lh
;
370 /* printk(KERN_INFO "log write header start (flags=%08x, pull=%d)\n", flags, pull); */
372 bh
= sb_getblk(sdp
->sd_vfs
, blkno
);
374 memset(bh
->b_data
, 0, bh
->b_size
);
375 set_buffer_uptodate(bh
);
376 clear_buffer_dirty(bh
);
379 gfs2_ail1_empty(sdp
, 0);
380 tail
= current_tail(sdp
);
382 lh
= (struct gfs2_log_header
*)bh
->b_data
;
383 memset(lh
, 0, sizeof(struct gfs2_log_header
));
384 lh
->lh_header
.mh_magic
= cpu_to_be32(GFS2_MAGIC
);
385 lh
->lh_header
.mh_type
= cpu_to_be32(GFS2_METATYPE_LH
);
386 lh
->lh_header
.mh_format
= cpu_to_be32(GFS2_FORMAT_LH
);
387 lh
->lh_sequence
= be64_to_cpu(sdp
->sd_log_sequence
++);
388 lh
->lh_flags
= be32_to_cpu(flags
);
389 lh
->lh_tail
= be32_to_cpu(tail
);
390 lh
->lh_blkno
= be32_to_cpu(sdp
->sd_log_flush_head
);
391 hash
= gfs2_disk_hash(bh
->b_data
, sizeof(struct gfs2_log_header
));
392 lh
->lh_hash
= cpu_to_be32(hash
);
394 set_buffer_dirty(bh
);
395 if (sync_dirty_buffer(bh
))
396 gfs2_io_error_bh(sdp
, bh
);
399 if (sdp
->sd_log_tail
!= tail
)
400 log_pull_tail(sdp
, tail
, pull
);
402 gfs2_assert_withdraw(sdp
, !pull
);
404 sdp
->sd_log_idle
= (tail
== sdp
->sd_log_flush_head
);
407 /* printk(KERN_INFO "log write header out\n"); */
410 static void log_flush_commit(struct gfs2_sbd
*sdp
)
412 struct list_head
*head
= &sdp
->sd_log_flush_list
;
413 struct gfs2_log_buf
*lb
;
414 struct buffer_head
*bh
;
418 d
= log_distance(sdp
, sdp
->sd_log_flush_head
, sdp
->sd_log_head
);
420 gfs2_assert_withdraw(sdp
, d
+ 1 == sdp
->sd_log_blks_reserved
);
423 while (!list_empty(head
)) {
424 lb
= list_entry(head
->next
, struct gfs2_log_buf
, lb_list
);
425 list_del(&lb
->lb_list
);
429 if (!buffer_uptodate(bh
))
430 gfs2_io_error_bh(sdp
, bh
);
432 while (atomic_read(&bh
->b_count
) != 1) /* Grrrr... */
434 free_buffer_head(bh
);
440 log_write_header(sdp
, 0, 0);
444 * gfs2_log_flush - flush incore transaction(s)
445 * @sdp: the filesystem
446 * @gl: The glock structure to flush. If NULL, flush the whole incore log
450 void gfs2_log_flush(struct gfs2_sbd
*sdp
, struct gfs2_glock
*gl
)
454 down_write(&sdp
->sd_log_flush_lock
);
458 if (list_empty(&gl
->gl_le
.le_list
)) {
459 gfs2_log_unlock(sdp
);
460 up_write(&sdp
->sd_log_flush_lock
);
463 gfs2_log_unlock(sdp
);
466 ai
= kzalloc(sizeof(struct gfs2_ail
), GFP_NOFS
| __GFP_NOFAIL
);
467 INIT_LIST_HEAD(&ai
->ai_ail1_list
);
468 INIT_LIST_HEAD(&ai
->ai_ail2_list
);
470 gfs2_assert_withdraw(sdp
,
471 sdp
->sd_log_num_buf
== sdp
->sd_log_commited_buf
);
472 gfs2_assert_withdraw(sdp
,
473 sdp
->sd_log_num_revoke
== sdp
->sd_log_commited_revoke
);
475 sdp
->sd_log_flush_head
= sdp
->sd_log_head
;
476 sdp
->sd_log_flush_wrapped
= 0;
477 ai
->ai_first
= sdp
->sd_log_flush_head
;
479 lops_before_commit(sdp
);
480 if (!list_empty(&sdp
->sd_log_flush_list
))
481 log_flush_commit(sdp
);
482 else if (sdp
->sd_log_tail
!= current_tail(sdp
) && !sdp
->sd_log_idle
)
483 log_write_header(sdp
, 0, PULL
);
484 lops_after_commit(sdp
, ai
);
485 sdp
->sd_log_head
= sdp
->sd_log_flush_head
;
487 /* printk(KERN_INFO "sd_log_num_hdrs %u\n", sdp->sd_log_num_hdrs); */
488 sdp
->sd_log_blks_free
-= sdp
->sd_log_num_hdrs
;
490 sdp
->sd_log_blks_reserved
=
491 sdp
->sd_log_commited_buf
=
492 sdp
->sd_log_num_hdrs
=
493 sdp
->sd_log_commited_revoke
= 0;
496 if (!list_empty(&ai
->ai_ail1_list
)) {
497 list_add(&ai
->ai_list
, &sdp
->sd_ail1_list
);
500 gfs2_log_unlock(sdp
);
502 sdp
->sd_vfs
->s_dirt
= 0;
503 up_write(&sdp
->sd_log_flush_lock
);
508 static void log_refund(struct gfs2_sbd
*sdp
, struct gfs2_trans
*tr
)
510 unsigned int reserved
= 1;
515 sdp
->sd_log_commited_buf
+= tr
->tr_num_buf_new
- tr
->tr_num_buf_rm
;
516 gfs2_assert_withdraw(sdp
, ((int)sdp
->sd_log_commited_buf
) >= 0);
517 sdp
->sd_log_commited_revoke
+= tr
->tr_num_revoke
- tr
->tr_num_revoke_rm
;
518 gfs2_assert_withdraw(sdp
, ((int)sdp
->sd_log_commited_revoke
) >= 0);
520 if (sdp
->sd_log_commited_buf
)
521 reserved
+= sdp
->sd_log_commited_buf
;
522 if (sdp
->sd_log_commited_revoke
)
523 reserved
+= gfs2_struct2blk(sdp
, sdp
->sd_log_commited_revoke
,
526 old
= sdp
->sd_log_blks_free
;
527 sdp
->sd_log_blks_free
+= tr
->tr_reserved
-
528 (reserved
- sdp
->sd_log_blks_reserved
);
530 gfs2_assert_withdraw(sdp
, sdp
->sd_log_blks_free
>= old
);
531 gfs2_assert_withdraw(sdp
,
532 sdp
->sd_log_blks_free
<= sdp
->sd_jdesc
->jd_blocks
+
533 sdp
->sd_log_num_hdrs
);
535 sdp
->sd_log_blks_reserved
= reserved
;
537 gfs2_log_unlock(sdp
);
541 * gfs2_log_commit - Commit a transaction to the log
542 * @sdp: the filesystem
543 * @tr: the transaction
548 void gfs2_log_commit(struct gfs2_sbd
*sdp
, struct gfs2_trans
*tr
)
551 lops_incore_commit(sdp
, tr
);
553 sdp
->sd_vfs
->s_dirt
= 1;
554 up_read(&sdp
->sd_log_flush_lock
);
557 if (sdp
->sd_log_num_buf
> gfs2_tune_get(sdp
, gt_incore_log_blocks
)) {
558 gfs2_log_unlock(sdp
);
559 gfs2_log_flush(sdp
, NULL
);
561 gfs2_log_unlock(sdp
);
565 * gfs2_log_shutdown - write a shutdown header into a journal
566 * @sdp: the filesystem
570 void gfs2_log_shutdown(struct gfs2_sbd
*sdp
)
572 down_write(&sdp
->sd_log_flush_lock
);
574 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_blks_reserved
);
575 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_num_gl
);
576 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_num_buf
);
577 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_num_jdata
);
578 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_num_revoke
);
579 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_num_rg
);
580 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_num_databuf
);
581 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_num_hdrs
);
582 gfs2_assert_withdraw(sdp
, list_empty(&sdp
->sd_ail1_list
));
584 sdp
->sd_log_flush_head
= sdp
->sd_log_head
;
585 sdp
->sd_log_flush_wrapped
= 0;
587 log_write_header(sdp
, GFS2_LOG_HEAD_UNMOUNT
, 0);
589 /* printk(KERN_INFO "sd_log_blks_free %u, sd_jdesc->jd_blocks %u\n", sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); */
590 gfs2_assert_warn(sdp
, sdp
->sd_log_blks_free
== sdp
->sd_jdesc
->jd_blocks
);
591 gfs2_assert_warn(sdp
, sdp
->sd_log_head
== sdp
->sd_log_tail
);
592 gfs2_assert_warn(sdp
, list_empty(&sdp
->sd_ail2_list
));
594 sdp
->sd_log_head
= sdp
->sd_log_flush_head
;
595 sdp
->sd_log_tail
= sdp
->sd_log_head
;
597 up_write(&sdp
->sd_log_flush_lock
);