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>
16 #include <linux/pagemap.h>
17 #include <linux/writeback.h>
18 #include <linux/swap.h>
19 #include <linux/delay.h>
20 #include <asm/semaphore.h>
32 #define buffer_busy(bh) \
33 ((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock) | (1ul << BH_Pinned)))
34 #define buffer_in_io(bh) \
35 ((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock)))
37 static int aspace_get_block(struct inode
*inode
, sector_t lblock
,
38 struct buffer_head
*bh_result
, int create
)
40 gfs2_assert_warn(get_v2sdp(inode
->i_sb
), 0);
44 static int gfs2_aspace_writepage(struct page
*page
,
45 struct writeback_control
*wbc
)
47 return block_write_full_page(page
, aspace_get_block
, wbc
);
51 * stuck_releasepage - We're stuck in gfs2_releasepage(). Print stuff out.
52 * @bh: the buffer we're stuck on
56 static void stuck_releasepage(struct buffer_head
*bh
)
58 struct gfs2_sbd
*sdp
= get_v2sdp(bh
->b_page
->mapping
->host
->i_sb
);
59 struct gfs2_bufdata
*bd
= get_v2bd(bh
);
60 struct gfs2_glock
*gl
;
62 fs_warn(sdp
, "stuck in gfs2_releasepage()\n");
63 fs_warn(sdp
, "blkno = %llu, bh->b_count = %d\n",
64 (uint64_t)bh
->b_blocknr
, atomic_read(&bh
->b_count
));
65 fs_warn(sdp
, "pinned = %u\n", buffer_pinned(bh
));
66 fs_warn(sdp
, "get_v2bd(bh) = %s\n", (bd
) ? "!NULL" : "NULL");
73 fs_warn(sdp
, "gl = (%u, %llu)\n",
74 gl
->gl_name
.ln_type
, gl
->gl_name
.ln_number
);
76 fs_warn(sdp
, "bd_list_tr = %s, bd_le.le_list = %s\n",
77 (list_empty(&bd
->bd_list_tr
)) ? "no" : "yes",
78 (list_empty(&bd
->bd_le
.le_list
)) ? "no" : "yes");
80 if (gl
->gl_ops
== &gfs2_inode_glops
) {
81 struct gfs2_inode
*ip
= get_gl2ip(gl
);
87 fs_warn(sdp
, "ip = %llu %llu\n",
88 ip
->i_num
.no_formal_ino
, ip
->i_num
.no_addr
);
89 fs_warn(sdp
, "ip->i_count = %d, ip->i_vnode = %s\n",
90 atomic_read(&ip
->i_count
),
91 (ip
->i_vnode
) ? "!NULL" : "NULL");
93 for (x
= 0; x
< GFS2_MAX_META_HEIGHT
; x
++)
94 fs_warn(sdp
, "ip->i_cache[%u] = %s\n",
95 x
, (ip
->i_cache
[x
]) ? "!NULL" : "NULL");
100 * gfs2_aspace_releasepage - free the metadata associated with a page
101 * @page: the page that's being released
102 * @gfp_mask: passed from Linux VFS, ignored by us
104 * Call try_to_free_buffers() if the buffers in this page can be
110 static int gfs2_aspace_releasepage(struct page
*page
, gfp_t gfp_mask
)
112 struct inode
*aspace
= page
->mapping
->host
;
113 struct gfs2_sbd
*sdp
= get_v2sdp(aspace
->i_sb
);
114 struct buffer_head
*bh
, *head
;
115 struct gfs2_bufdata
*bd
;
118 if (!page_has_buffers(page
))
121 head
= bh
= page_buffers(page
);
125 while (atomic_read(&bh
->b_count
)) {
126 if (atomic_read(&aspace
->i_writecount
)) {
127 if (time_after_eq(jiffies
, t
+
128 gfs2_tune_get(sdp
, gt_stall_secs
) * HZ
)) {
129 stuck_releasepage(bh
);
140 gfs2_assert_warn(sdp
, !buffer_pinned(bh
));
144 gfs2_assert_warn(sdp
, bd
->bd_bh
== bh
);
145 gfs2_assert_warn(sdp
, list_empty(&bd
->bd_list_tr
));
146 gfs2_assert_warn(sdp
, list_empty(&bd
->bd_le
.le_list
));
147 gfs2_assert_warn(sdp
, !bd
->bd_ail
);
148 kmem_cache_free(gfs2_bufdata_cachep
, bd
);
149 atomic_dec(&sdp
->sd_bufdata_count
);
153 bh
= bh
->b_this_page
;
158 return try_to_free_buffers(page
);
161 static struct address_space_operations aspace_aops
= {
162 .writepage
= gfs2_aspace_writepage
,
163 .releasepage
= gfs2_aspace_releasepage
,
167 * gfs2_aspace_get - Create and initialize a struct inode structure
168 * @sdp: the filesystem the aspace is in
170 * Right now a struct inode is just a struct inode. Maybe Linux
171 * will supply a more lightweight address space construct (that works)
174 * Make sure pages/buffers in this aspace aren't in high memory.
176 * Returns: the aspace
179 struct inode
*gfs2_aspace_get(struct gfs2_sbd
*sdp
)
181 struct inode
*aspace
;
183 aspace
= new_inode(sdp
->sd_vfs
);
185 mapping_set_gfp_mask(aspace
->i_mapping
, GFP_KERNEL
);
186 aspace
->i_mapping
->a_ops
= &aspace_aops
;
187 aspace
->i_size
= ~0ULL;
188 set_v2ip(aspace
, NULL
);
189 insert_inode_hash(aspace
);
195 void gfs2_aspace_put(struct inode
*aspace
)
197 remove_inode_hash(aspace
);
202 * gfs2_ail1_start_one - Start I/O on a part of the AIL
203 * @sdp: the filesystem
204 * @tr: the part of the AIL
208 void gfs2_ail1_start_one(struct gfs2_sbd
*sdp
, struct gfs2_ail
*ai
)
210 struct gfs2_bufdata
*bd
, *s
;
211 struct buffer_head
*bh
;
217 list_for_each_entry_safe_reverse(bd
, s
, &ai
->ai_ail1_list
,
221 gfs2_assert(sdp
, bd
->bd_ail
== ai
);
223 if (!buffer_busy(bh
)) {
224 if (!buffer_uptodate(bh
))
225 gfs2_io_error_bh(sdp
, bh
);
226 list_move(&bd
->bd_ail_st_list
,
231 if (!buffer_dirty(bh
))
234 list_move(&bd
->bd_ail_st_list
, &ai
->ai_ail1_list
);
236 gfs2_log_unlock(sdp
);
238 ll_rw_block(WRITE
, 1, &bh
);
248 * gfs2_ail1_empty_one - Check whether or not a trans in the AIL has been synced
249 * @sdp: the filesystem
254 int gfs2_ail1_empty_one(struct gfs2_sbd
*sdp
, struct gfs2_ail
*ai
, int flags
)
256 struct gfs2_bufdata
*bd
, *s
;
257 struct buffer_head
*bh
;
259 list_for_each_entry_safe_reverse(bd
, s
, &ai
->ai_ail1_list
,
263 gfs2_assert(sdp
, bd
->bd_ail
== ai
);
265 if (buffer_busy(bh
)) {
272 if (!buffer_uptodate(bh
))
273 gfs2_io_error_bh(sdp
, bh
);
275 list_move(&bd
->bd_ail_st_list
, &ai
->ai_ail2_list
);
278 return list_empty(&ai
->ai_ail1_list
);
282 * gfs2_ail2_empty_one - Check whether or not a trans in the AIL has been synced
283 * @sdp: the filesystem
288 void gfs2_ail2_empty_one(struct gfs2_sbd
*sdp
, struct gfs2_ail
*ai
)
290 struct list_head
*head
= &ai
->ai_ail2_list
;
291 struct gfs2_bufdata
*bd
;
293 while (!list_empty(head
)) {
294 bd
= list_entry(head
->prev
, struct gfs2_bufdata
,
296 gfs2_assert(sdp
, bd
->bd_ail
== ai
);
298 list_del(&bd
->bd_ail_st_list
);
299 list_del(&bd
->bd_ail_gl_list
);
300 atomic_dec(&bd
->bd_gl
->gl_ail_count
);
306 * ail_empty_gl - remove all buffers for a given lock from the AIL
309 * None of the buffers should be dirty, locked, or pinned.
312 void gfs2_ail_empty_gl(struct gfs2_glock
*gl
)
314 struct gfs2_sbd
*sdp
= gl
->gl_sbd
;
316 struct list_head
*head
= &gl
->gl_ail_list
;
317 struct gfs2_bufdata
*bd
;
318 struct buffer_head
*bh
;
322 blocks
= atomic_read(&gl
->gl_ail_count
);
326 error
= gfs2_trans_begin(sdp
, 0, blocks
);
327 if (gfs2_assert_withdraw(sdp
, !error
))
331 while (!list_empty(head
)) {
332 bd
= list_entry(head
->next
, struct gfs2_bufdata
,
335 blkno
= bh
->b_blocknr
;
336 gfs2_assert_withdraw(sdp
, !buffer_busy(bh
));
339 list_del(&bd
->bd_ail_st_list
);
340 list_del(&bd
->bd_ail_gl_list
);
341 atomic_dec(&gl
->gl_ail_count
);
343 gfs2_log_unlock(sdp
);
345 gfs2_trans_add_revoke(sdp
, blkno
);
349 gfs2_assert_withdraw(sdp
, !atomic_read(&gl
->gl_ail_count
));
350 gfs2_log_unlock(sdp
);
357 * gfs2_meta_inval - Invalidate all buffers associated with a glock
362 void gfs2_meta_inval(struct gfs2_glock
*gl
)
364 struct gfs2_sbd
*sdp
= gl
->gl_sbd
;
365 struct inode
*aspace
= gl
->gl_aspace
;
366 struct address_space
*mapping
= gl
->gl_aspace
->i_mapping
;
368 gfs2_assert_withdraw(sdp
, !atomic_read(&gl
->gl_ail_count
));
370 atomic_inc(&aspace
->i_writecount
);
371 truncate_inode_pages(mapping
, 0);
372 atomic_dec(&aspace
->i_writecount
);
374 gfs2_assert_withdraw(sdp
, !mapping
->nrpages
);
378 * gfs2_meta_sync - Sync all buffers associated with a glock
380 * @flags: DIO_START | DIO_WAIT
384 void gfs2_meta_sync(struct gfs2_glock
*gl
, int flags
)
386 struct address_space
*mapping
= gl
->gl_aspace
->i_mapping
;
389 if (flags
& DIO_START
)
390 filemap_fdatawrite(mapping
);
391 if (!error
&& (flags
& DIO_WAIT
))
392 error
= filemap_fdatawait(mapping
);
395 gfs2_io_error(gl
->gl_sbd
);
399 * getbuf - Get a buffer with a given address space
400 * @sdp: the filesystem
401 * @aspace: the address space
402 * @blkno: the block number (filesystem scope)
403 * @create: 1 if the buffer should be created
405 * Returns: the buffer
408 static struct buffer_head
*getbuf(struct gfs2_sbd
*sdp
, struct inode
*aspace
,
409 uint64_t blkno
, int create
)
412 struct buffer_head
*bh
;
417 shift
= PAGE_CACHE_SHIFT
- sdp
->sd_sb
.sb_bsize_shift
;
418 index
= blkno
>> shift
; /* convert block to page */
419 bufnum
= blkno
- (index
<< shift
); /* block buf index within page */
423 page
= grab_cache_page(aspace
->i_mapping
, index
);
429 page
= find_lock_page(aspace
->i_mapping
, index
);
434 if (!page_has_buffers(page
))
435 create_empty_buffers(page
, sdp
->sd_sb
.sb_bsize
, 0);
437 /* Locate header for our buffer within our page */
438 for (bh
= page_buffers(page
); bufnum
--; bh
= bh
->b_this_page
)
442 if (!buffer_mapped(bh
))
443 map_bh(bh
, sdp
->sd_vfs
, blkno
);
446 mark_page_accessed(page
);
447 page_cache_release(page
);
452 static void meta_prep_new(struct buffer_head
*bh
)
454 struct gfs2_meta_header
*mh
= (struct gfs2_meta_header
*)bh
->b_data
;
457 clear_buffer_dirty(bh
);
458 set_buffer_uptodate(bh
);
461 mh
->mh_magic
= cpu_to_be32(GFS2_MAGIC
);
465 * gfs2_meta_new - Get a block
466 * @gl: The glock associated with this block
467 * @blkno: The block number
469 * Returns: The buffer
472 struct buffer_head
*gfs2_meta_new(struct gfs2_glock
*gl
, uint64_t blkno
)
474 struct buffer_head
*bh
;
475 bh
= getbuf(gl
->gl_sbd
, gl
->gl_aspace
, blkno
, CREATE
);
481 * gfs2_meta_read - Read a block from disk
482 * @gl: The glock covering the block
483 * @blkno: The block number
484 * @flags: flags to gfs2_dreread()
485 * @bhp: the place where the buffer is returned (NULL on failure)
490 int gfs2_meta_read(struct gfs2_glock
*gl
, uint64_t blkno
, int flags
,
491 struct buffer_head
**bhp
)
495 *bhp
= getbuf(gl
->gl_sbd
, gl
->gl_aspace
, blkno
, CREATE
);
496 error
= gfs2_meta_reread(gl
->gl_sbd
, *bhp
, flags
);
504 * gfs2_meta_reread - Reread a block from disk
505 * @sdp: the filesystem
506 * @bh: The block to read
507 * @flags: Flags that control the read
512 int gfs2_meta_reread(struct gfs2_sbd
*sdp
, struct buffer_head
*bh
, int flags
)
514 if (unlikely(test_bit(SDF_SHUTDOWN
, &sdp
->sd_flags
)))
517 if (flags
& DIO_FORCE
)
518 clear_buffer_uptodate(bh
);
520 if ((flags
& DIO_START
) && !buffer_uptodate(bh
))
521 ll_rw_block(READ
, 1, &bh
);
523 if (flags
& DIO_WAIT
) {
526 if (!buffer_uptodate(bh
)) {
527 struct gfs2_trans
*tr
= get_transaction
;
528 if (tr
&& tr
->tr_touched
)
529 gfs2_io_error_bh(sdp
, bh
);
532 if (unlikely(test_bit(SDF_SHUTDOWN
, &sdp
->sd_flags
)))
540 * gfs2_attach_bufdata - attach a struct gfs2_bufdata structure to a buffer
541 * @gl: the glock the buffer belongs to
542 * @bh: The buffer to be attached to
543 * @meta: Flag to indicate whether its metadata or not
546 void gfs2_attach_bufdata(struct gfs2_glock
*gl
, struct buffer_head
*bh
, int meta
)
548 struct gfs2_bufdata
*bd
;
550 lock_page(bh
->b_page
);
553 unlock_page(bh
->b_page
);
557 bd
= kmem_cache_alloc(gfs2_bufdata_cachep
, GFP_KERNEL
| __GFP_NOFAIL
),
558 atomic_inc(&gl
->gl_sbd
->sd_bufdata_count
);
560 memset(bd
, 0, sizeof(struct gfs2_bufdata
));
565 INIT_LIST_HEAD(&bd
->bd_list_tr
);
567 lops_init_le(&bd
->bd_le
, &gfs2_buf_lops
);
569 lops_init_le(&bd
->bd_le
, &gfs2_databuf_lops
);
573 unlock_page(bh
->b_page
);
577 * gfs2_pin - Pin a buffer in memory
578 * @sdp: the filesystem the buffer belongs to
579 * @bh: The buffer to be pinned
583 void gfs2_pin(struct gfs2_sbd
*sdp
, struct buffer_head
*bh
)
585 struct gfs2_bufdata
*bd
= get_v2bd(bh
);
587 gfs2_assert_withdraw(sdp
, test_bit(SDF_JOURNAL_LIVE
, &sdp
->sd_flags
));
589 if (test_set_buffer_pinned(bh
))
590 gfs2_assert_withdraw(sdp
, 0);
594 /* If this buffer is in the AIL and it has already been written
595 to in-place disk block, remove it from the AIL. */
598 if (bd
->bd_ail
&& !buffer_in_io(bh
))
599 list_move(&bd
->bd_ail_st_list
, &bd
->bd_ail
->ai_ail2_list
);
600 gfs2_log_unlock(sdp
);
602 clear_buffer_dirty(bh
);
605 if (!buffer_uptodate(bh
))
606 gfs2_io_error_bh(sdp
, bh
);
612 * gfs2_unpin - Unpin a buffer
613 * @sdp: the filesystem the buffer belongs to
614 * @bh: The buffer to unpin
619 void gfs2_unpin(struct gfs2_sbd
*sdp
, struct buffer_head
*bh
,
622 struct gfs2_bufdata
*bd
= get_v2bd(bh
);
624 gfs2_assert_withdraw(sdp
, buffer_uptodate(bh
));
626 if (!buffer_pinned(bh
))
627 gfs2_assert_withdraw(sdp
, 0);
629 mark_buffer_dirty(bh
);
630 clear_buffer_pinned(bh
);
634 list_del(&bd
->bd_ail_st_list
);
637 struct gfs2_glock
*gl
= bd
->bd_gl
;
638 list_add(&bd
->bd_ail_gl_list
, &gl
->gl_ail_list
);
639 atomic_inc(&gl
->gl_ail_count
);
642 list_add(&bd
->bd_ail_st_list
, &ai
->ai_ail1_list
);
643 gfs2_log_unlock(sdp
);
647 * gfs2_meta_wipe - make inode's buffers so they aren't dirty/pinned anymore
648 * @ip: the inode who owns the buffers
649 * @bstart: the first buffer in the run
650 * @blen: the number of buffers in the run
654 void gfs2_meta_wipe(struct gfs2_inode
*ip
, uint64_t bstart
, uint32_t blen
)
656 struct gfs2_sbd
*sdp
= ip
->i_sbd
;
657 struct inode
*aspace
= ip
->i_gl
->gl_aspace
;
658 struct buffer_head
*bh
;
661 bh
= getbuf(sdp
, aspace
, bstart
, NO_CREATE
);
663 struct gfs2_bufdata
*bd
= get_v2bd(bh
);
665 if (test_clear_buffer_pinned(bh
)) {
667 list_del_init(&bd
->bd_le
.le_list
);
668 gfs2_assert_warn(sdp
, sdp
->sd_log_num_buf
);
669 sdp
->sd_log_num_buf
--;
670 gfs2_log_unlock(sdp
);
671 get_transaction
->tr_num_buf_rm
++;
677 uint64_t blkno
= bh
->b_blocknr
;
679 list_del(&bd
->bd_ail_st_list
);
680 list_del(&bd
->bd_ail_gl_list
);
681 atomic_dec(&bd
->bd_gl
->gl_ail_count
);
683 gfs2_log_unlock(sdp
);
684 gfs2_trans_add_revoke(sdp
, blkno
);
686 gfs2_log_unlock(sdp
);
690 clear_buffer_dirty(bh
);
691 clear_buffer_uptodate(bh
);
703 * gfs2_meta_cache_flush - get rid of any references on buffers for this inode
704 * @ip: The GFS2 inode
706 * This releases buffers that are in the most-recently-used array of
707 * blocks used for indirect block addressing for this inode.
710 void gfs2_meta_cache_flush(struct gfs2_inode
*ip
)
712 struct buffer_head
**bh_slot
;
715 spin_lock(&ip
->i_spin
);
717 for (x
= 0; x
< GFS2_MAX_META_HEIGHT
; x
++) {
718 bh_slot
= &ip
->i_cache
[x
];
725 spin_unlock(&ip
->i_spin
);
729 * gfs2_meta_indirect_buffer - Get a metadata buffer
730 * @ip: The GFS2 inode
731 * @height: The level of this buf in the metadata (indir addr) tree (if any)
732 * @num: The block number (device relative) of the buffer
733 * @new: Non-zero if we may create a new buffer
734 * @bhp: the buffer is returned here
736 * Try to use the gfs2_inode's MRU metadata tree cache.
741 int gfs2_meta_indirect_buffer(struct gfs2_inode
*ip
, int height
, uint64_t num
,
742 int new, struct buffer_head
**bhp
)
744 struct buffer_head
*bh
, **bh_slot
= ip
->i_cache
+ height
;
747 spin_lock(&ip
->i_spin
);
750 if (bh
->b_blocknr
== num
)
755 spin_unlock(&ip
->i_spin
);
761 error
= gfs2_meta_reread(ip
->i_sbd
, bh
,
762 DIO_START
| DIO_WAIT
);
770 bh
= gfs2_meta_new(ip
->i_gl
, num
);
772 error
= gfs2_meta_read(ip
->i_gl
, num
,
773 DIO_START
| DIO_WAIT
, &bh
);
778 spin_lock(&ip
->i_spin
);
779 if (*bh_slot
!= bh
) {
784 spin_unlock(&ip
->i_spin
);
788 if (gfs2_assert_warn(ip
->i_sbd
, height
)) {
792 gfs2_trans_add_bh(ip
->i_gl
, bh
, 1);
793 gfs2_metatype_set(bh
, GFS2_METATYPE_IN
, GFS2_FORMAT_IN
);
794 gfs2_buffer_clear_tail(bh
, sizeof(struct gfs2_meta_header
));
796 } else if (gfs2_metatype_check(ip
->i_sbd
, bh
,
797 (height
) ? GFS2_METATYPE_IN
: GFS2_METATYPE_DI
)) {
808 * gfs2_meta_ra - start readahead on an extent of a file
809 * @gl: the glock the blocks belong to
810 * @dblock: the starting disk block
811 * @extlen: the number of blocks in the extent
815 void gfs2_meta_ra(struct gfs2_glock
*gl
, uint64_t dblock
, uint32_t extlen
)
817 struct gfs2_sbd
*sdp
= gl
->gl_sbd
;
818 struct inode
*aspace
= gl
->gl_aspace
;
819 struct buffer_head
*first_bh
, *bh
;
820 uint32_t max_ra
= gfs2_tune_get(sdp
, gt_max_readahead
) >> sdp
->sd_sb
.sb_bsize_shift
;
823 if (!extlen
|| !max_ra
)
828 first_bh
= getbuf(sdp
, aspace
, dblock
, CREATE
);
830 if (buffer_uptodate(first_bh
))
832 if (!buffer_locked(first_bh
)) {
833 error
= gfs2_meta_reread(sdp
, first_bh
, DIO_START
);
842 bh
= getbuf(sdp
, aspace
, dblock
, CREATE
);
844 if (!buffer_uptodate(bh
) && !buffer_locked(bh
)) {
845 error
= gfs2_meta_reread(sdp
, bh
, DIO_START
);
855 if (buffer_uptodate(first_bh
))
864 * gfs2_meta_syncfs - sync all the buffers in a filesystem
865 * @sdp: the filesystem
869 void gfs2_meta_syncfs(struct gfs2_sbd
*sdp
)
873 gfs2_ail1_start(sdp
, DIO_ALL
);
874 if (gfs2_ail1_empty(sdp
, DIO_ALL
))