2a8b4b71dd1fa1f06aae40112772224a3572284c
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 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>
19 #include "lm_interface.h"
32 * gfs2_struct2blk - compute stuff
33 * @sdp: the filesystem
34 * @nstruct: the number of structures
35 * @ssize: the size of the structures
37 * Compute the number of log descriptor blocks needed to hold a certain number
38 * of structures of a certain size.
40 * Returns: the number of blocks needed (minimum is always 1)
43 unsigned int gfs2_struct2blk(struct gfs2_sbd
*sdp
, unsigned int nstruct
,
47 unsigned int first
, second
;
50 first
= (sdp
->sd_sb
.sb_bsize
- sizeof(struct gfs2_log_descriptor
)) /
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
);
62 void gfs2_ail1_start(struct gfs2_sbd
*sdp
, int flags
)
64 struct list_head
*head
= &sdp
->sd_ail1_list
;
66 struct list_head
*first
, *tmp
;
67 struct gfs2_ail
*first_ai
, *ai
;
70 if (list_empty(head
)) {
74 sync_gen
= sdp
->sd_ail_sync_gen
++;
77 first_ai
= list_entry(first
, struct gfs2_ail
, ai_list
);
78 first_ai
->ai_sync_gen
= sync_gen
;
79 gfs2_ail1_start_one(sdp
, first_ai
);
85 if (first
&& (head
->prev
!= first
||
86 gfs2_ail1_empty_one(sdp
, first_ai
, 0)))
89 for (tmp
= head
->prev
; tmp
!= head
; tmp
= tmp
->prev
) {
90 ai
= list_entry(tmp
, struct gfs2_ail
, ai_list
);
91 if (ai
->ai_sync_gen
>= sync_gen
)
93 ai
->ai_sync_gen
= sync_gen
;
94 gfs2_ail1_start_one(sdp
, ai
);
102 gfs2_log_unlock(sdp
);
105 int gfs2_ail1_empty(struct gfs2_sbd
*sdp
, int flags
)
107 struct gfs2_ail
*ai
, *s
;
112 list_for_each_entry_safe_reverse(ai
, s
, &sdp
->sd_ail1_list
, ai_list
) {
113 if (gfs2_ail1_empty_one(sdp
, ai
, flags
))
114 list_move(&ai
->ai_list
, &sdp
->sd_ail2_list
);
115 else if (!(flags
& DIO_ALL
))
119 ret
= list_empty(&sdp
->sd_ail1_list
);
121 gfs2_log_unlock(sdp
);
126 static void ail2_empty(struct gfs2_sbd
*sdp
, unsigned int new_tail
)
128 struct gfs2_ail
*ai
, *safe
;
129 unsigned int old_tail
= sdp
->sd_log_tail
;
130 int wrap
= (new_tail
< old_tail
);
135 list_for_each_entry_safe(ai
, safe
, &sdp
->sd_ail2_list
, ai_list
) {
136 a
= (old_tail
<= ai
->ai_first
);
137 b
= (ai
->ai_first
< new_tail
);
138 rm
= (wrap
) ? (a
|| b
) : (a
&& b
);
142 gfs2_ail2_empty_one(sdp
, ai
);
143 list_del(&ai
->ai_list
);
144 gfs2_assert_warn(sdp
, list_empty(&ai
->ai_ail1_list
));
145 gfs2_assert_warn(sdp
, list_empty(&ai
->ai_ail2_list
));
149 gfs2_log_unlock(sdp
);
153 * gfs2_log_reserve - Make a log reservation
154 * @sdp: The GFS2 superblock
155 * @blks: The number of blocks to reserve
160 int gfs2_log_reserve(struct gfs2_sbd
*sdp
, unsigned int blks
)
162 unsigned int try = 0;
164 if (gfs2_assert_warn(sdp
, blks
) ||
165 gfs2_assert_warn(sdp
, blks
<= sdp
->sd_jdesc
->jd_blocks
))
168 mutex_lock(&sdp
->sd_log_reserve_mutex
);
170 while(sdp
->sd_log_blks_free
<= blks
) {
171 gfs2_log_unlock(sdp
);
172 gfs2_ail1_empty(sdp
, 0);
173 gfs2_log_flush(sdp
, NULL
);
176 gfs2_ail1_start(sdp
, 0);
179 sdp
->sd_log_blks_free
-= blks
;
180 /* printk(KERN_INFO "reserved %u blocks (%u left)\n", blks, sdp->sd_log_blks_free); */
181 gfs2_log_unlock(sdp
);
182 mutex_unlock(&sdp
->sd_log_reserve_mutex
);
184 down_read(&sdp
->sd_log_flush_lock
);
190 * gfs2_log_release - Release a given number of log blocks
191 * @sdp: The GFS2 superblock
192 * @blks: The number of blocks
196 void gfs2_log_release(struct gfs2_sbd
*sdp
, unsigned int blks
)
200 sdp
->sd_log_blks_free
+= blks
;
201 /* printk(KERN_INFO "released %u blocks (%u left)\n", blks, sdp->sd_log_blks_free); */
202 gfs2_assert_withdraw(sdp
,
203 sdp
->sd_log_blks_free
<= sdp
->sd_jdesc
->jd_blocks
);
204 gfs2_log_unlock(sdp
);
205 up_read(&sdp
->sd_log_flush_lock
);
208 static uint64_t log_bmap(struct gfs2_sbd
*sdp
, unsigned int lbn
)
215 error
= gfs2_block_map(sdp
->sd_jdesc
->jd_inode
, lbn
, &new, &dbn
, &bdy
);
216 gfs2_assert_withdraw(sdp
, !error
&& dbn
);
222 * log_distance - Compute distance between two journal blocks
223 * @sdp: The GFS2 superblock
224 * @newer: The most recent journal block of the pair
225 * @older: The older journal block of the pair
227 * Compute the distance (in the journal direction) between two
228 * blocks in the journal
230 * Returns: the distance in blocks
233 static inline unsigned int log_distance(struct gfs2_sbd
*sdp
,
239 dist
= newer
- older
;
241 dist
+= sdp
->sd_jdesc
->jd_blocks
;
246 static unsigned int current_tail(struct gfs2_sbd
*sdp
)
253 if (list_empty(&sdp
->sd_ail1_list
))
254 tail
= sdp
->sd_log_head
;
256 ai
= list_entry(sdp
->sd_ail1_list
.prev
,
257 struct gfs2_ail
, ai_list
);
261 gfs2_log_unlock(sdp
);
266 static inline void log_incr_head(struct gfs2_sbd
*sdp
)
268 if (sdp
->sd_log_flush_head
== sdp
->sd_log_tail
)
269 gfs2_assert_withdraw(sdp
,
270 sdp
->sd_log_flush_head
== sdp
->sd_log_head
);
272 if (++sdp
->sd_log_flush_head
== sdp
->sd_jdesc
->jd_blocks
) {
273 sdp
->sd_log_flush_head
= 0;
274 sdp
->sd_log_flush_wrapped
= 1;
279 * gfs2_log_get_buf - Get and initialize a buffer to use for log control data
280 * @sdp: The GFS2 superblock
282 * Returns: the buffer_head
285 struct buffer_head
*gfs2_log_get_buf(struct gfs2_sbd
*sdp
)
287 uint64_t blkno
= log_bmap(sdp
, sdp
->sd_log_flush_head
);
288 struct gfs2_log_buf
*lb
;
289 struct buffer_head
*bh
;
291 lb
= kzalloc(sizeof(struct gfs2_log_buf
), GFP_NOFS
| __GFP_NOFAIL
);
292 list_add(&lb
->lb_list
, &sdp
->sd_log_flush_list
);
294 bh
= lb
->lb_bh
= sb_getblk(sdp
->sd_vfs
, blkno
);
296 memset(bh
->b_data
, 0, bh
->b_size
);
297 set_buffer_uptodate(bh
);
298 clear_buffer_dirty(bh
);
307 * gfs2_log_fake_buf - Build a fake buffer head to write metadata buffer to log
308 * @sdp: the filesystem
309 * @data: the data the buffer_head should point to
311 * Returns: the log buffer descriptor
314 struct buffer_head
*gfs2_log_fake_buf(struct gfs2_sbd
*sdp
,
315 struct buffer_head
*real
)
317 uint64_t blkno
= log_bmap(sdp
, sdp
->sd_log_flush_head
);
318 struct gfs2_log_buf
*lb
;
319 struct buffer_head
*bh
;
321 lb
= kzalloc(sizeof(struct gfs2_log_buf
), GFP_NOFS
| __GFP_NOFAIL
);
322 list_add(&lb
->lb_list
, &sdp
->sd_log_flush_list
);
325 bh
= lb
->lb_bh
= alloc_buffer_head(GFP_NOFS
| __GFP_NOFAIL
);
326 atomic_set(&bh
->b_count
, 1);
327 bh
->b_state
= (1 << BH_Mapped
) | (1 << BH_Uptodate
);
328 set_bh_page(bh
, real
->b_page
, bh_offset(real
));
329 bh
->b_blocknr
= blkno
;
330 bh
->b_size
= sdp
->sd_sb
.sb_bsize
;
331 bh
->b_bdev
= sdp
->sd_vfs
->s_bdev
;
338 static void log_pull_tail(struct gfs2_sbd
*sdp
, unsigned int new_tail
, int pull
)
340 unsigned int dist
= log_distance(sdp
, new_tail
, sdp
->sd_log_tail
);
342 ail2_empty(sdp
, new_tail
);
345 sdp
->sd_log_blks_free
+= dist
- ((pull
) ? 1 : 0);
346 /* printk(KERN_INFO "pull tail refunding %u blocks (%u left) pull=%d\n", dist - ((pull) ? 1 : 0), sdp->sd_log_blks_free, pull); */
347 gfs2_assert_withdraw(sdp
,
348 sdp
->sd_log_blks_free
<= sdp
->sd_jdesc
->jd_blocks
);
349 gfs2_log_unlock(sdp
);
351 sdp
->sd_log_tail
= new_tail
;
355 * log_write_header - Get and initialize a journal header buffer
356 * @sdp: The GFS2 superblock
358 * Returns: the initialized log buffer descriptor
361 static void log_write_header(struct gfs2_sbd
*sdp
, uint32_t flags
, int pull
)
363 uint64_t blkno
= log_bmap(sdp
, sdp
->sd_log_flush_head
);
364 struct buffer_head
*bh
;
365 struct gfs2_log_header
*lh
;
369 /* printk(KERN_INFO "log write header start (flags=%08x, pull=%d)\n", flags, pull); */
371 bh
= sb_getblk(sdp
->sd_vfs
, blkno
);
373 memset(bh
->b_data
, 0, bh
->b_size
);
374 set_buffer_uptodate(bh
);
375 clear_buffer_dirty(bh
);
378 gfs2_ail1_empty(sdp
, 0);
379 tail
= current_tail(sdp
);
381 lh
= (struct gfs2_log_header
*)bh
->b_data
;
382 memset(lh
, 0, sizeof(struct gfs2_log_header
));
383 lh
->lh_header
.mh_magic
= cpu_to_be32(GFS2_MAGIC
);
384 lh
->lh_header
.mh_type
= cpu_to_be32(GFS2_METATYPE_LH
);
385 lh
->lh_header
.mh_format
= cpu_to_be32(GFS2_FORMAT_LH
);
386 lh
->lh_sequence
= be64_to_cpu(sdp
->sd_log_sequence
++);
387 lh
->lh_flags
= be32_to_cpu(flags
);
388 lh
->lh_tail
= be32_to_cpu(tail
);
389 lh
->lh_blkno
= be32_to_cpu(sdp
->sd_log_flush_head
);
390 hash
= gfs2_disk_hash(bh
->b_data
, sizeof(struct gfs2_log_header
));
391 lh
->lh_hash
= cpu_to_be32(hash
);
393 set_buffer_dirty(bh
);
394 if (sync_dirty_buffer(bh
))
395 gfs2_io_error_bh(sdp
, bh
);
398 if (sdp
->sd_log_tail
!= tail
)
399 log_pull_tail(sdp
, tail
, pull
);
401 gfs2_assert_withdraw(sdp
, !pull
);
403 sdp
->sd_log_idle
= (tail
== sdp
->sd_log_flush_head
);
406 /* printk(KERN_INFO "log write header out\n"); */
409 static void log_flush_commit(struct gfs2_sbd
*sdp
)
411 struct list_head
*head
= &sdp
->sd_log_flush_list
;
412 struct gfs2_log_buf
*lb
;
413 struct buffer_head
*bh
;
417 d
= log_distance(sdp
, sdp
->sd_log_flush_head
, sdp
->sd_log_head
);
419 gfs2_assert_withdraw(sdp
, d
+ 1 == sdp
->sd_log_blks_reserved
);
422 while (!list_empty(head
)) {
423 lb
= list_entry(head
->next
, struct gfs2_log_buf
, lb_list
);
424 list_del(&lb
->lb_list
);
428 if (!buffer_uptodate(bh
))
429 gfs2_io_error_bh(sdp
, bh
);
431 while (atomic_read(&bh
->b_count
) != 1) /* Grrrr... */
433 free_buffer_head(bh
);
439 log_write_header(sdp
, 0, 0);
443 * gfs2_log_flush - flush incore transaction(s)
444 * @sdp: the filesystem
445 * @gl: The glock structure to flush. If NULL, flush the whole incore log
449 void gfs2_log_flush(struct gfs2_sbd
*sdp
, struct gfs2_glock
*gl
)
453 down_write(&sdp
->sd_log_flush_lock
);
457 if (list_empty(&gl
->gl_le
.le_list
)) {
458 gfs2_log_unlock(sdp
);
459 up_write(&sdp
->sd_log_flush_lock
);
462 gfs2_log_unlock(sdp
);
465 ai
= kzalloc(sizeof(struct gfs2_ail
), GFP_NOFS
| __GFP_NOFAIL
);
466 INIT_LIST_HEAD(&ai
->ai_ail1_list
);
467 INIT_LIST_HEAD(&ai
->ai_ail2_list
);
469 gfs2_assert_withdraw(sdp
,
470 sdp
->sd_log_num_buf
== sdp
->sd_log_commited_buf
);
471 gfs2_assert_withdraw(sdp
,
472 sdp
->sd_log_num_revoke
== sdp
->sd_log_commited_revoke
);
474 sdp
->sd_log_flush_head
= sdp
->sd_log_head
;
475 sdp
->sd_log_flush_wrapped
= 0;
476 ai
->ai_first
= sdp
->sd_log_flush_head
;
478 lops_before_commit(sdp
);
479 if (!list_empty(&sdp
->sd_log_flush_list
))
480 log_flush_commit(sdp
);
481 else if (sdp
->sd_log_tail
!= current_tail(sdp
) && !sdp
->sd_log_idle
)
482 log_write_header(sdp
, 0, PULL
);
483 lops_after_commit(sdp
, ai
);
484 sdp
->sd_log_head
= sdp
->sd_log_flush_head
;
486 /* printk(KERN_INFO "sd_log_num_hdrs %u\n", sdp->sd_log_num_hdrs); */
487 sdp
->sd_log_blks_free
-= sdp
->sd_log_num_hdrs
;
489 sdp
->sd_log_blks_reserved
=
490 sdp
->sd_log_commited_buf
=
491 sdp
->sd_log_num_hdrs
=
492 sdp
->sd_log_commited_revoke
= 0;
495 if (!list_empty(&ai
->ai_ail1_list
)) {
496 list_add(&ai
->ai_list
, &sdp
->sd_ail1_list
);
499 gfs2_log_unlock(sdp
);
501 sdp
->sd_vfs
->s_dirt
= 0;
502 up_write(&sdp
->sd_log_flush_lock
);
507 static void log_refund(struct gfs2_sbd
*sdp
, struct gfs2_trans
*tr
)
509 unsigned int reserved
= 1;
514 sdp
->sd_log_commited_buf
+= tr
->tr_num_buf_new
- tr
->tr_num_buf_rm
;
515 gfs2_assert_withdraw(sdp
, ((int)sdp
->sd_log_commited_buf
) >= 0);
516 sdp
->sd_log_commited_revoke
+= tr
->tr_num_revoke
- tr
->tr_num_revoke_rm
;
517 gfs2_assert_withdraw(sdp
, ((int)sdp
->sd_log_commited_revoke
) >= 0);
519 if (sdp
->sd_log_commited_buf
)
520 reserved
+= sdp
->sd_log_commited_buf
;
521 if (sdp
->sd_log_commited_revoke
)
522 reserved
+= gfs2_struct2blk(sdp
, sdp
->sd_log_commited_revoke
,
525 old
= sdp
->sd_log_blks_free
;
526 sdp
->sd_log_blks_free
+= tr
->tr_reserved
-
527 (reserved
- sdp
->sd_log_blks_reserved
);
529 gfs2_assert_withdraw(sdp
, sdp
->sd_log_blks_free
>= old
);
530 gfs2_assert_withdraw(sdp
,
531 sdp
->sd_log_blks_free
<= sdp
->sd_jdesc
->jd_blocks
+
532 sdp
->sd_log_num_hdrs
);
534 sdp
->sd_log_blks_reserved
= reserved
;
536 gfs2_log_unlock(sdp
);
540 * gfs2_log_commit - Commit a transaction to the log
541 * @sdp: the filesystem
542 * @tr: the transaction
547 void gfs2_log_commit(struct gfs2_sbd
*sdp
, struct gfs2_trans
*tr
)
550 lops_incore_commit(sdp
, tr
);
552 sdp
->sd_vfs
->s_dirt
= 1;
553 up_read(&sdp
->sd_log_flush_lock
);
556 if (sdp
->sd_log_num_buf
> gfs2_tune_get(sdp
, gt_incore_log_blocks
)) {
557 gfs2_log_unlock(sdp
);
558 gfs2_log_flush(sdp
, NULL
);
560 gfs2_log_unlock(sdp
);
564 * gfs2_log_shutdown - write a shutdown header into a journal
565 * @sdp: the filesystem
569 void gfs2_log_shutdown(struct gfs2_sbd
*sdp
)
571 down_write(&sdp
->sd_log_flush_lock
);
573 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_blks_reserved
);
574 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_num_gl
);
575 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_num_buf
);
576 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_num_jdata
);
577 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_num_revoke
);
578 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_num_rg
);
579 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_num_databuf
);
580 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_num_hdrs
);
581 gfs2_assert_withdraw(sdp
, list_empty(&sdp
->sd_ail1_list
));
583 sdp
->sd_log_flush_head
= sdp
->sd_log_head
;
584 sdp
->sd_log_flush_wrapped
= 0;
586 log_write_header(sdp
, GFS2_LOG_HEAD_UNMOUNT
, 0);
588 /* printk(KERN_INFO "sd_log_blks_free %u, sd_jdesc->jd_blocks %u\n", sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); */
589 gfs2_assert_warn(sdp
, sdp
->sd_log_blks_free
== sdp
->sd_jdesc
->jd_blocks
);
590 gfs2_assert_warn(sdp
, sdp
->sd_log_head
== sdp
->sd_log_tail
);
591 gfs2_assert_warn(sdp
, list_empty(&sdp
->sd_ail2_list
));
593 sdp
->sd_log_head
= sdp
->sd_log_flush_head
;
594 sdp
->sd_log_tail
= sdp
->sd_log_head
;
596 up_write(&sdp
->sd_log_flush_lock
);
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