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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) 2004-2006 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 if (!(!error
&& dbn
)) {
217 printk(KERN_INFO
"error=%d, dbn=%llu lbn=%u", error
, (unsigned long long)dbn
, lbn
);
219 gfs2_assert_withdraw(sdp
, !error
&& dbn
);
225 * log_distance - Compute distance between two journal blocks
226 * @sdp: The GFS2 superblock
227 * @newer: The most recent journal block of the pair
228 * @older: The older journal block of the pair
230 * Compute the distance (in the journal direction) between two
231 * blocks in the journal
233 * Returns: the distance in blocks
236 static inline unsigned int log_distance(struct gfs2_sbd
*sdp
,
242 dist
= newer
- older
;
244 dist
+= sdp
->sd_jdesc
->jd_blocks
;
249 static unsigned int current_tail(struct gfs2_sbd
*sdp
)
256 if (list_empty(&sdp
->sd_ail1_list
))
257 tail
= sdp
->sd_log_head
;
259 ai
= list_entry(sdp
->sd_ail1_list
.prev
,
260 struct gfs2_ail
, ai_list
);
264 gfs2_log_unlock(sdp
);
269 static inline void log_incr_head(struct gfs2_sbd
*sdp
)
271 if (sdp
->sd_log_flush_head
== sdp
->sd_log_tail
)
272 gfs2_assert_withdraw(sdp
,
273 sdp
->sd_log_flush_head
== sdp
->sd_log_head
);
275 if (++sdp
->sd_log_flush_head
== sdp
->sd_jdesc
->jd_blocks
) {
276 sdp
->sd_log_flush_head
= 0;
277 sdp
->sd_log_flush_wrapped
= 1;
282 * gfs2_log_get_buf - Get and initialize a buffer to use for log control data
283 * @sdp: The GFS2 superblock
285 * Returns: the buffer_head
288 struct buffer_head
*gfs2_log_get_buf(struct gfs2_sbd
*sdp
)
290 uint64_t blkno
= log_bmap(sdp
, sdp
->sd_log_flush_head
);
291 struct gfs2_log_buf
*lb
;
292 struct buffer_head
*bh
;
294 lb
= kzalloc(sizeof(struct gfs2_log_buf
), GFP_NOFS
| __GFP_NOFAIL
);
295 list_add(&lb
->lb_list
, &sdp
->sd_log_flush_list
);
297 bh
= lb
->lb_bh
= sb_getblk(sdp
->sd_vfs
, blkno
);
299 memset(bh
->b_data
, 0, bh
->b_size
);
300 set_buffer_uptodate(bh
);
301 clear_buffer_dirty(bh
);
310 * gfs2_log_fake_buf - Build a fake buffer head to write metadata buffer to log
311 * @sdp: the filesystem
312 * @data: the data the buffer_head should point to
314 * Returns: the log buffer descriptor
317 struct buffer_head
*gfs2_log_fake_buf(struct gfs2_sbd
*sdp
,
318 struct buffer_head
*real
)
320 uint64_t blkno
= log_bmap(sdp
, sdp
->sd_log_flush_head
);
321 struct gfs2_log_buf
*lb
;
322 struct buffer_head
*bh
;
324 lb
= kzalloc(sizeof(struct gfs2_log_buf
), GFP_NOFS
| __GFP_NOFAIL
);
325 list_add(&lb
->lb_list
, &sdp
->sd_log_flush_list
);
328 bh
= lb
->lb_bh
= alloc_buffer_head(GFP_NOFS
| __GFP_NOFAIL
);
329 atomic_set(&bh
->b_count
, 1);
330 bh
->b_state
= (1 << BH_Mapped
) | (1 << BH_Uptodate
);
331 set_bh_page(bh
, real
->b_page
, bh_offset(real
));
332 bh
->b_blocknr
= blkno
;
333 bh
->b_size
= sdp
->sd_sb
.sb_bsize
;
334 bh
->b_bdev
= sdp
->sd_vfs
->s_bdev
;
341 static void log_pull_tail(struct gfs2_sbd
*sdp
, unsigned int new_tail
, int pull
)
343 unsigned int dist
= log_distance(sdp
, new_tail
, sdp
->sd_log_tail
);
345 ail2_empty(sdp
, new_tail
);
348 sdp
->sd_log_blks_free
+= dist
- ((pull
) ? 1 : 0);
349 /* printk(KERN_INFO "pull tail refunding %u blocks (%u left) pull=%d\n", dist - ((pull) ? 1 : 0), sdp->sd_log_blks_free, pull); */
350 gfs2_assert_withdraw(sdp
,
351 sdp
->sd_log_blks_free
<= sdp
->sd_jdesc
->jd_blocks
);
352 gfs2_log_unlock(sdp
);
354 sdp
->sd_log_tail
= new_tail
;
358 * log_write_header - Get and initialize a journal header buffer
359 * @sdp: The GFS2 superblock
361 * Returns: the initialized log buffer descriptor
364 static void log_write_header(struct gfs2_sbd
*sdp
, uint32_t flags
, int pull
)
366 uint64_t blkno
= log_bmap(sdp
, sdp
->sd_log_flush_head
);
367 struct buffer_head
*bh
;
368 struct gfs2_log_header
*lh
;
372 /* printk(KERN_INFO "log write header start (flags=%08x, pull=%d)\n", flags, pull); */
374 bh
= sb_getblk(sdp
->sd_vfs
, blkno
);
376 memset(bh
->b_data
, 0, bh
->b_size
);
377 set_buffer_uptodate(bh
);
378 clear_buffer_dirty(bh
);
381 gfs2_ail1_empty(sdp
, 0);
382 tail
= current_tail(sdp
);
384 lh
= (struct gfs2_log_header
*)bh
->b_data
;
385 memset(lh
, 0, sizeof(struct gfs2_log_header
));
386 lh
->lh_header
.mh_magic
= cpu_to_be32(GFS2_MAGIC
);
387 lh
->lh_header
.mh_type
= cpu_to_be32(GFS2_METATYPE_LH
);
388 lh
->lh_header
.mh_format
= cpu_to_be32(GFS2_FORMAT_LH
);
389 lh
->lh_sequence
= be64_to_cpu(sdp
->sd_log_sequence
++);
390 lh
->lh_flags
= be32_to_cpu(flags
);
391 lh
->lh_tail
= be32_to_cpu(tail
);
392 lh
->lh_blkno
= be32_to_cpu(sdp
->sd_log_flush_head
);
393 hash
= gfs2_disk_hash(bh
->b_data
, sizeof(struct gfs2_log_header
));
394 lh
->lh_hash
= cpu_to_be32(hash
);
396 set_buffer_dirty(bh
);
397 if (sync_dirty_buffer(bh
))
398 gfs2_io_error_bh(sdp
, bh
);
401 if (sdp
->sd_log_tail
!= tail
)
402 log_pull_tail(sdp
, tail
, pull
);
404 gfs2_assert_withdraw(sdp
, !pull
);
406 sdp
->sd_log_idle
= (tail
== sdp
->sd_log_flush_head
);
409 /* printk(KERN_INFO "log write header out\n"); */
412 static void log_flush_commit(struct gfs2_sbd
*sdp
)
414 struct list_head
*head
= &sdp
->sd_log_flush_list
;
415 struct gfs2_log_buf
*lb
;
416 struct buffer_head
*bh
;
420 d
= log_distance(sdp
, sdp
->sd_log_flush_head
, sdp
->sd_log_head
);
422 gfs2_assert_withdraw(sdp
, d
+ 1 == sdp
->sd_log_blks_reserved
);
425 while (!list_empty(head
)) {
426 lb
= list_entry(head
->next
, struct gfs2_log_buf
, lb_list
);
427 list_del(&lb
->lb_list
);
431 if (!buffer_uptodate(bh
))
432 gfs2_io_error_bh(sdp
, bh
);
434 while (atomic_read(&bh
->b_count
) != 1) /* Grrrr... */
436 free_buffer_head(bh
);
442 log_write_header(sdp
, 0, 0);
446 * gfs2_log_flush - flush incore transaction(s)
447 * @sdp: the filesystem
448 * @gl: The glock structure to flush. If NULL, flush the whole incore log
452 void gfs2_log_flush(struct gfs2_sbd
*sdp
, struct gfs2_glock
*gl
)
456 down_write(&sdp
->sd_log_flush_lock
);
460 if (list_empty(&gl
->gl_le
.le_list
)) {
461 gfs2_log_unlock(sdp
);
462 up_write(&sdp
->sd_log_flush_lock
);
465 gfs2_log_unlock(sdp
);
468 ai
= kzalloc(sizeof(struct gfs2_ail
), GFP_NOFS
| __GFP_NOFAIL
);
469 INIT_LIST_HEAD(&ai
->ai_ail1_list
);
470 INIT_LIST_HEAD(&ai
->ai_ail2_list
);
472 gfs2_assert_withdraw(sdp
,
473 sdp
->sd_log_num_buf
== sdp
->sd_log_commited_buf
);
474 gfs2_assert_withdraw(sdp
,
475 sdp
->sd_log_num_revoke
== sdp
->sd_log_commited_revoke
);
477 sdp
->sd_log_flush_head
= sdp
->sd_log_head
;
478 sdp
->sd_log_flush_wrapped
= 0;
479 ai
->ai_first
= sdp
->sd_log_flush_head
;
481 lops_before_commit(sdp
);
482 if (!list_empty(&sdp
->sd_log_flush_list
))
483 log_flush_commit(sdp
);
484 else if (sdp
->sd_log_tail
!= current_tail(sdp
) && !sdp
->sd_log_idle
)
485 log_write_header(sdp
, 0, PULL
);
486 lops_after_commit(sdp
, ai
);
487 sdp
->sd_log_head
= sdp
->sd_log_flush_head
;
489 /* printk(KERN_INFO "sd_log_num_hdrs %u\n", sdp->sd_log_num_hdrs); */
490 sdp
->sd_log_blks_free
-= sdp
->sd_log_num_hdrs
;
492 sdp
->sd_log_blks_reserved
=
493 sdp
->sd_log_commited_buf
=
494 sdp
->sd_log_num_hdrs
=
495 sdp
->sd_log_commited_revoke
= 0;
498 if (!list_empty(&ai
->ai_ail1_list
)) {
499 list_add(&ai
->ai_list
, &sdp
->sd_ail1_list
);
502 gfs2_log_unlock(sdp
);
504 sdp
->sd_vfs
->s_dirt
= 0;
505 up_write(&sdp
->sd_log_flush_lock
);
510 static void log_refund(struct gfs2_sbd
*sdp
, struct gfs2_trans
*tr
)
512 unsigned int reserved
= 1;
517 sdp
->sd_log_commited_buf
+= tr
->tr_num_buf_new
- tr
->tr_num_buf_rm
;
518 gfs2_assert_withdraw(sdp
, ((int)sdp
->sd_log_commited_buf
) >= 0);
519 sdp
->sd_log_commited_revoke
+= tr
->tr_num_revoke
- tr
->tr_num_revoke_rm
;
520 gfs2_assert_withdraw(sdp
, ((int)sdp
->sd_log_commited_revoke
) >= 0);
522 if (sdp
->sd_log_commited_buf
)
523 reserved
+= sdp
->sd_log_commited_buf
;
524 if (sdp
->sd_log_commited_revoke
)
525 reserved
+= gfs2_struct2blk(sdp
, sdp
->sd_log_commited_revoke
,
528 old
= sdp
->sd_log_blks_free
;
529 sdp
->sd_log_blks_free
+= tr
->tr_reserved
-
530 (reserved
- sdp
->sd_log_blks_reserved
);
532 gfs2_assert_withdraw(sdp
, sdp
->sd_log_blks_free
>= old
);
533 gfs2_assert_withdraw(sdp
,
534 sdp
->sd_log_blks_free
<= sdp
->sd_jdesc
->jd_blocks
+
535 sdp
->sd_log_num_hdrs
);
537 sdp
->sd_log_blks_reserved
= reserved
;
539 gfs2_log_unlock(sdp
);
543 * gfs2_log_commit - Commit a transaction to the log
544 * @sdp: the filesystem
545 * @tr: the transaction
550 void gfs2_log_commit(struct gfs2_sbd
*sdp
, struct gfs2_trans
*tr
)
553 lops_incore_commit(sdp
, tr
);
555 sdp
->sd_vfs
->s_dirt
= 1;
556 up_read(&sdp
->sd_log_flush_lock
);
559 if (sdp
->sd_log_num_buf
> gfs2_tune_get(sdp
, gt_incore_log_blocks
)) {
560 gfs2_log_unlock(sdp
);
561 gfs2_log_flush(sdp
, NULL
);
563 gfs2_log_unlock(sdp
);
567 * gfs2_log_shutdown - write a shutdown header into a journal
568 * @sdp: the filesystem
572 void gfs2_log_shutdown(struct gfs2_sbd
*sdp
)
574 down_write(&sdp
->sd_log_flush_lock
);
576 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_blks_reserved
);
577 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_num_gl
);
578 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_num_buf
);
579 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_num_jdata
);
580 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_num_revoke
);
581 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_num_rg
);
582 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_num_databuf
);
583 gfs2_assert_withdraw(sdp
, !sdp
->sd_log_num_hdrs
);
584 gfs2_assert_withdraw(sdp
, list_empty(&sdp
->sd_ail1_list
));
586 sdp
->sd_log_flush_head
= sdp
->sd_log_head
;
587 sdp
->sd_log_flush_wrapped
= 0;
589 log_write_header(sdp
, GFS2_LOG_HEAD_UNMOUNT
, 0);
591 /* printk(KERN_INFO "sd_log_blks_free %u, sd_jdesc->jd_blocks %u\n", sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); */
592 gfs2_assert_warn(sdp
, sdp
->sd_log_blks_free
== sdp
->sd_jdesc
->jd_blocks
);
593 gfs2_assert_warn(sdp
, sdp
->sd_log_head
== sdp
->sd_log_tail
);
594 gfs2_assert_warn(sdp
, list_empty(&sdp
->sd_ail2_list
));
596 sdp
->sd_log_head
= sdp
->sd_log_flush_head
;
597 sdp
->sd_log_tail
= sdp
->sd_log_head
;
599 up_write(&sdp
->sd_log_flush_lock
);