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 <linux/gfs2_ondisk.h>
21 #include <asm/semaphore.h>
24 #include "lm_interface.h"
36 #define buffer_busy(bh) \
37 ((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock) | (1ul << BH_Pinned)))
38 #define buffer_in_io(bh) \
39 ((bh)->b_state & ((1ul << BH_Dirty) | (1ul << BH_Lock)))
41 static int aspace_get_block(struct inode
*inode
, sector_t lblock
,
42 struct buffer_head
*bh_result
, int create
)
44 gfs2_assert_warn(inode
->i_sb
->s_fs_info
, 0);
48 static int gfs2_aspace_writepage(struct page
*page
,
49 struct writeback_control
*wbc
)
51 return block_write_full_page(page
, aspace_get_block
, wbc
);
55 * stuck_releasepage - We're stuck in gfs2_releasepage(). Print stuff out.
56 * @bh: the buffer we're stuck on
60 static void stuck_releasepage(struct buffer_head
*bh
)
62 struct gfs2_sbd
*sdp
= bh
->b_page
->mapping
->host
->i_sb
->s_fs_info
;
63 struct gfs2_bufdata
*bd
= bh
->b_private
;
64 struct gfs2_glock
*gl
;
66 fs_warn(sdp
, "stuck in gfs2_releasepage()\n");
67 fs_warn(sdp
, "blkno = %llu, bh->b_count = %d\n",
68 (uint64_t)bh
->b_blocknr
, atomic_read(&bh
->b_count
));
69 fs_warn(sdp
, "pinned = %u\n", buffer_pinned(bh
));
70 fs_warn(sdp
, "bh->b_private = %s\n", (bd
) ? "!NULL" : "NULL");
77 fs_warn(sdp
, "gl = (%u, %llu)\n",
78 gl
->gl_name
.ln_type
, gl
->gl_name
.ln_number
);
80 fs_warn(sdp
, "bd_list_tr = %s, bd_le.le_list = %s\n",
81 (list_empty(&bd
->bd_list_tr
)) ? "no" : "yes",
82 (list_empty(&bd
->bd_le
.le_list
)) ? "no" : "yes");
84 if (gl
->gl_ops
== &gfs2_inode_glops
) {
85 struct gfs2_inode
*ip
= gl
->gl_object
;
91 fs_warn(sdp
, "ip = %llu %llu\n",
92 ip
->i_num
.no_formal_ino
, ip
->i_num
.no_addr
);
93 fs_warn(sdp
, "ip->i_count = %d, ip->i_vnode = %s\n",
94 atomic_read(&ip
->i_count
),
95 (ip
->i_vnode
) ? "!NULL" : "NULL");
97 for (x
= 0; x
< GFS2_MAX_META_HEIGHT
; x
++)
98 fs_warn(sdp
, "ip->i_cache[%u] = %s\n",
99 x
, (ip
->i_cache
[x
]) ? "!NULL" : "NULL");
104 * gfs2_aspace_releasepage - free the metadata associated with a page
105 * @page: the page that's being released
106 * @gfp_mask: passed from Linux VFS, ignored by us
108 * Call try_to_free_buffers() if the buffers in this page can be
114 static int gfs2_aspace_releasepage(struct page
*page
, gfp_t gfp_mask
)
116 struct inode
*aspace
= page
->mapping
->host
;
117 struct gfs2_sbd
*sdp
= aspace
->i_sb
->s_fs_info
;
118 struct buffer_head
*bh
, *head
;
119 struct gfs2_bufdata
*bd
;
122 if (!page_has_buffers(page
))
125 head
= bh
= page_buffers(page
);
129 while (atomic_read(&bh
->b_count
)) {
130 if (atomic_read(&aspace
->i_writecount
)) {
131 if (time_after_eq(jiffies
, t
+
132 gfs2_tune_get(sdp
, gt_stall_secs
) * HZ
)) {
133 stuck_releasepage(bh
);
144 gfs2_assert_warn(sdp
, !buffer_pinned(bh
));
148 gfs2_assert_warn(sdp
, bd
->bd_bh
== bh
);
149 gfs2_assert_warn(sdp
, list_empty(&bd
->bd_list_tr
));
150 gfs2_assert_warn(sdp
, list_empty(&bd
->bd_le
.le_list
));
151 gfs2_assert_warn(sdp
, !bd
->bd_ail
);
152 kmem_cache_free(gfs2_bufdata_cachep
, bd
);
153 bh
->b_private
= NULL
;
156 bh
= bh
->b_this_page
;
161 return try_to_free_buffers(page
);
164 static struct address_space_operations aspace_aops
= {
165 .writepage
= gfs2_aspace_writepage
,
166 .releasepage
= gfs2_aspace_releasepage
,
170 * gfs2_aspace_get - Create and initialize a struct inode structure
171 * @sdp: the filesystem the aspace is in
173 * Right now a struct inode is just a struct inode. Maybe Linux
174 * will supply a more lightweight address space construct (that works)
177 * Make sure pages/buffers in this aspace aren't in high memory.
179 * Returns: the aspace
182 struct inode
*gfs2_aspace_get(struct gfs2_sbd
*sdp
)
184 struct inode
*aspace
;
186 aspace
= new_inode(sdp
->sd_vfs
);
188 mapping_set_gfp_mask(aspace
->i_mapping
, GFP_KERNEL
);
189 aspace
->i_mapping
->a_ops
= &aspace_aops
;
190 aspace
->i_size
= ~0ULL;
191 aspace
->u
.generic_ip
= NULL
;
192 insert_inode_hash(aspace
);
198 void gfs2_aspace_put(struct inode
*aspace
)
200 remove_inode_hash(aspace
);
205 * gfs2_ail1_start_one - Start I/O on a part of the AIL
206 * @sdp: the filesystem
207 * @tr: the part of the AIL
211 void gfs2_ail1_start_one(struct gfs2_sbd
*sdp
, struct gfs2_ail
*ai
)
213 struct gfs2_bufdata
*bd
, *s
;
214 struct buffer_head
*bh
;
220 list_for_each_entry_safe_reverse(bd
, s
, &ai
->ai_ail1_list
,
224 gfs2_assert(sdp
, bd
->bd_ail
== ai
);
226 if (!buffer_busy(bh
)) {
227 if (!buffer_uptodate(bh
))
228 gfs2_io_error_bh(sdp
, bh
);
229 list_move(&bd
->bd_ail_st_list
,
234 if (!buffer_dirty(bh
))
237 list_move(&bd
->bd_ail_st_list
, &ai
->ai_ail1_list
);
239 gfs2_log_unlock(sdp
);
241 ll_rw_block(WRITE
, 1, &bh
);
251 * gfs2_ail1_empty_one - Check whether or not a trans in the AIL has been synced
252 * @sdp: the filesystem
257 int gfs2_ail1_empty_one(struct gfs2_sbd
*sdp
, struct gfs2_ail
*ai
, int flags
)
259 struct gfs2_bufdata
*bd
, *s
;
260 struct buffer_head
*bh
;
262 list_for_each_entry_safe_reverse(bd
, s
, &ai
->ai_ail1_list
,
266 gfs2_assert(sdp
, bd
->bd_ail
== ai
);
268 if (buffer_busy(bh
)) {
275 if (!buffer_uptodate(bh
))
276 gfs2_io_error_bh(sdp
, bh
);
278 list_move(&bd
->bd_ail_st_list
, &ai
->ai_ail2_list
);
281 return list_empty(&ai
->ai_ail1_list
);
285 * gfs2_ail2_empty_one - Check whether or not a trans in the AIL has been synced
286 * @sdp: the filesystem
291 void gfs2_ail2_empty_one(struct gfs2_sbd
*sdp
, struct gfs2_ail
*ai
)
293 struct list_head
*head
= &ai
->ai_ail2_list
;
294 struct gfs2_bufdata
*bd
;
296 while (!list_empty(head
)) {
297 bd
= list_entry(head
->prev
, struct gfs2_bufdata
,
299 gfs2_assert(sdp
, bd
->bd_ail
== ai
);
301 list_del(&bd
->bd_ail_st_list
);
302 list_del(&bd
->bd_ail_gl_list
);
303 atomic_dec(&bd
->bd_gl
->gl_ail_count
);
309 * ail_empty_gl - remove all buffers for a given lock from the AIL
312 * None of the buffers should be dirty, locked, or pinned.
315 void gfs2_ail_empty_gl(struct gfs2_glock
*gl
)
317 struct gfs2_sbd
*sdp
= gl
->gl_sbd
;
319 struct list_head
*head
= &gl
->gl_ail_list
;
320 struct gfs2_bufdata
*bd
;
321 struct buffer_head
*bh
;
325 blocks
= atomic_read(&gl
->gl_ail_count
);
329 error
= gfs2_trans_begin(sdp
, 0, blocks
);
330 if (gfs2_assert_withdraw(sdp
, !error
))
334 while (!list_empty(head
)) {
335 bd
= list_entry(head
->next
, struct gfs2_bufdata
,
338 blkno
= bh
->b_blocknr
;
339 gfs2_assert_withdraw(sdp
, !buffer_busy(bh
));
342 list_del(&bd
->bd_ail_st_list
);
343 list_del(&bd
->bd_ail_gl_list
);
344 atomic_dec(&gl
->gl_ail_count
);
346 gfs2_log_unlock(sdp
);
348 gfs2_trans_add_revoke(sdp
, blkno
);
352 gfs2_assert_withdraw(sdp
, !atomic_read(&gl
->gl_ail_count
));
353 gfs2_log_unlock(sdp
);
360 * gfs2_meta_inval - Invalidate all buffers associated with a glock
365 void gfs2_meta_inval(struct gfs2_glock
*gl
)
367 struct gfs2_sbd
*sdp
= gl
->gl_sbd
;
368 struct inode
*aspace
= gl
->gl_aspace
;
369 struct address_space
*mapping
= gl
->gl_aspace
->i_mapping
;
371 gfs2_assert_withdraw(sdp
, !atomic_read(&gl
->gl_ail_count
));
373 atomic_inc(&aspace
->i_writecount
);
374 truncate_inode_pages(mapping
, 0);
375 atomic_dec(&aspace
->i_writecount
);
377 gfs2_assert_withdraw(sdp
, !mapping
->nrpages
);
381 * gfs2_meta_sync - Sync all buffers associated with a glock
383 * @flags: DIO_START | DIO_WAIT
387 void gfs2_meta_sync(struct gfs2_glock
*gl
, int flags
)
389 struct address_space
*mapping
= gl
->gl_aspace
->i_mapping
;
392 if (flags
& DIO_START
)
393 filemap_fdatawrite(mapping
);
394 if (!error
&& (flags
& DIO_WAIT
))
395 error
= filemap_fdatawait(mapping
);
398 gfs2_io_error(gl
->gl_sbd
);
402 * getbuf - Get a buffer with a given address space
403 * @sdp: the filesystem
404 * @aspace: the address space
405 * @blkno: the block number (filesystem scope)
406 * @create: 1 if the buffer should be created
408 * Returns: the buffer
411 static struct buffer_head
*getbuf(struct gfs2_sbd
*sdp
, struct inode
*aspace
,
412 uint64_t blkno
, int create
)
415 struct buffer_head
*bh
;
420 shift
= PAGE_CACHE_SHIFT
- sdp
->sd_sb
.sb_bsize_shift
;
421 index
= blkno
>> shift
; /* convert block to page */
422 bufnum
= blkno
- (index
<< shift
); /* block buf index within page */
426 page
= grab_cache_page(aspace
->i_mapping
, index
);
432 page
= find_lock_page(aspace
->i_mapping
, index
);
437 if (!page_has_buffers(page
))
438 create_empty_buffers(page
, sdp
->sd_sb
.sb_bsize
, 0);
440 /* Locate header for our buffer within our page */
441 for (bh
= page_buffers(page
); bufnum
--; bh
= bh
->b_this_page
)
445 if (!buffer_mapped(bh
))
446 map_bh(bh
, sdp
->sd_vfs
, blkno
);
449 mark_page_accessed(page
);
450 page_cache_release(page
);
455 static void meta_prep_new(struct buffer_head
*bh
)
457 struct gfs2_meta_header
*mh
= (struct gfs2_meta_header
*)bh
->b_data
;
460 clear_buffer_dirty(bh
);
461 set_buffer_uptodate(bh
);
464 mh
->mh_magic
= cpu_to_be32(GFS2_MAGIC
);
468 * gfs2_meta_new - Get a block
469 * @gl: The glock associated with this block
470 * @blkno: The block number
472 * Returns: The buffer
475 struct buffer_head
*gfs2_meta_new(struct gfs2_glock
*gl
, uint64_t blkno
)
477 struct buffer_head
*bh
;
478 bh
= getbuf(gl
->gl_sbd
, gl
->gl_aspace
, blkno
, CREATE
);
484 * gfs2_meta_read - Read a block from disk
485 * @gl: The glock covering the block
486 * @blkno: The block number
487 * @flags: flags to gfs2_dreread()
488 * @bhp: the place where the buffer is returned (NULL on failure)
493 int gfs2_meta_read(struct gfs2_glock
*gl
, uint64_t blkno
, int flags
,
494 struct buffer_head
**bhp
)
498 *bhp
= getbuf(gl
->gl_sbd
, gl
->gl_aspace
, blkno
, CREATE
);
499 error
= gfs2_meta_reread(gl
->gl_sbd
, *bhp
, flags
);
507 * gfs2_meta_reread - Reread a block from disk
508 * @sdp: the filesystem
509 * @bh: The block to read
510 * @flags: Flags that control the read
515 int gfs2_meta_reread(struct gfs2_sbd
*sdp
, struct buffer_head
*bh
, int flags
)
517 if (unlikely(test_bit(SDF_SHUTDOWN
, &sdp
->sd_flags
)))
520 if (flags
& DIO_FORCE
)
521 clear_buffer_uptodate(bh
);
523 if ((flags
& DIO_START
) && !buffer_uptodate(bh
))
524 ll_rw_block(READ
, 1, &bh
);
526 if (flags
& DIO_WAIT
) {
529 if (!buffer_uptodate(bh
)) {
530 struct gfs2_trans
*tr
= current
->journal_info
;
531 if (tr
&& tr
->tr_touched
)
532 gfs2_io_error_bh(sdp
, bh
);
535 if (unlikely(test_bit(SDF_SHUTDOWN
, &sdp
->sd_flags
)))
543 * gfs2_attach_bufdata - attach a struct gfs2_bufdata structure to a buffer
544 * @gl: the glock the buffer belongs to
545 * @bh: The buffer to be attached to
546 * @meta: Flag to indicate whether its metadata or not
549 void gfs2_attach_bufdata(struct gfs2_glock
*gl
, struct buffer_head
*bh
,
552 struct gfs2_bufdata
*bd
;
555 lock_page(bh
->b_page
);
559 unlock_page(bh
->b_page
);
563 bd
= kmem_cache_alloc(gfs2_bufdata_cachep
, GFP_NOFS
| __GFP_NOFAIL
),
564 memset(bd
, 0, sizeof(struct gfs2_bufdata
));
569 INIT_LIST_HEAD(&bd
->bd_list_tr
);
571 lops_init_le(&bd
->bd_le
, &gfs2_buf_lops
);
573 lops_init_le(&bd
->bd_le
, &gfs2_databuf_lops
);
579 unlock_page(bh
->b_page
);
583 * gfs2_pin - Pin a buffer in memory
584 * @sdp: the filesystem the buffer belongs to
585 * @bh: The buffer to be pinned
589 void gfs2_pin(struct gfs2_sbd
*sdp
, struct buffer_head
*bh
)
591 struct gfs2_bufdata
*bd
= bh
->b_private
;
593 gfs2_assert_withdraw(sdp
, test_bit(SDF_JOURNAL_LIVE
, &sdp
->sd_flags
));
595 if (test_set_buffer_pinned(bh
))
596 gfs2_assert_withdraw(sdp
, 0);
600 /* If this buffer is in the AIL and it has already been written
601 to in-place disk block, remove it from the AIL. */
604 if (bd
->bd_ail
&& !buffer_in_io(bh
))
605 list_move(&bd
->bd_ail_st_list
, &bd
->bd_ail
->ai_ail2_list
);
606 gfs2_log_unlock(sdp
);
608 clear_buffer_dirty(bh
);
611 if (!buffer_uptodate(bh
))
612 gfs2_io_error_bh(sdp
, bh
);
618 * gfs2_unpin - Unpin a buffer
619 * @sdp: the filesystem the buffer belongs to
620 * @bh: The buffer to unpin
625 void gfs2_unpin(struct gfs2_sbd
*sdp
, struct buffer_head
*bh
,
628 struct gfs2_bufdata
*bd
= bh
->b_private
;
630 gfs2_assert_withdraw(sdp
, buffer_uptodate(bh
));
632 if (!buffer_pinned(bh
))
633 gfs2_assert_withdraw(sdp
, 0);
635 mark_buffer_dirty(bh
);
636 clear_buffer_pinned(bh
);
640 list_del(&bd
->bd_ail_st_list
);
643 struct gfs2_glock
*gl
= bd
->bd_gl
;
644 list_add(&bd
->bd_ail_gl_list
, &gl
->gl_ail_list
);
645 atomic_inc(&gl
->gl_ail_count
);
648 list_add(&bd
->bd_ail_st_list
, &ai
->ai_ail1_list
);
649 gfs2_log_unlock(sdp
);
653 * gfs2_meta_wipe - make inode's buffers so they aren't dirty/pinned anymore
654 * @ip: the inode who owns the buffers
655 * @bstart: the first buffer in the run
656 * @blen: the number of buffers in the run
660 void gfs2_meta_wipe(struct gfs2_inode
*ip
, uint64_t bstart
, uint32_t blen
)
662 struct gfs2_sbd
*sdp
= ip
->i_sbd
;
663 struct inode
*aspace
= ip
->i_gl
->gl_aspace
;
664 struct buffer_head
*bh
;
667 bh
= getbuf(sdp
, aspace
, bstart
, NO_CREATE
);
669 struct gfs2_bufdata
*bd
= bh
->b_private
;
671 if (test_clear_buffer_pinned(bh
)) {
672 struct gfs2_trans
*tr
= current
->journal_info
;
674 list_del_init(&bd
->bd_le
.le_list
);
675 gfs2_assert_warn(sdp
, sdp
->sd_log_num_buf
);
676 sdp
->sd_log_num_buf
--;
677 gfs2_log_unlock(sdp
);
684 uint64_t blkno
= bh
->b_blocknr
;
686 list_del(&bd
->bd_ail_st_list
);
687 list_del(&bd
->bd_ail_gl_list
);
688 atomic_dec(&bd
->bd_gl
->gl_ail_count
);
690 gfs2_log_unlock(sdp
);
691 gfs2_trans_add_revoke(sdp
, blkno
);
693 gfs2_log_unlock(sdp
);
697 clear_buffer_dirty(bh
);
698 clear_buffer_uptodate(bh
);
710 * gfs2_meta_cache_flush - get rid of any references on buffers for this inode
711 * @ip: The GFS2 inode
713 * This releases buffers that are in the most-recently-used array of
714 * blocks used for indirect block addressing for this inode.
717 void gfs2_meta_cache_flush(struct gfs2_inode
*ip
)
719 struct buffer_head
**bh_slot
;
722 spin_lock(&ip
->i_spin
);
724 for (x
= 0; x
< GFS2_MAX_META_HEIGHT
; x
++) {
725 bh_slot
= &ip
->i_cache
[x
];
732 spin_unlock(&ip
->i_spin
);
736 * gfs2_meta_indirect_buffer - Get a metadata buffer
737 * @ip: The GFS2 inode
738 * @height: The level of this buf in the metadata (indir addr) tree (if any)
739 * @num: The block number (device relative) of the buffer
740 * @new: Non-zero if we may create a new buffer
741 * @bhp: the buffer is returned here
743 * Try to use the gfs2_inode's MRU metadata tree cache.
748 int gfs2_meta_indirect_buffer(struct gfs2_inode
*ip
, int height
, uint64_t num
,
749 int new, struct buffer_head
**bhp
)
751 struct buffer_head
*bh
, **bh_slot
= ip
->i_cache
+ height
;
754 spin_lock(&ip
->i_spin
);
757 if (bh
->b_blocknr
== num
)
762 spin_unlock(&ip
->i_spin
);
768 error
= gfs2_meta_reread(ip
->i_sbd
, bh
,
769 DIO_START
| DIO_WAIT
);
777 bh
= gfs2_meta_new(ip
->i_gl
, num
);
779 error
= gfs2_meta_read(ip
->i_gl
, num
,
780 DIO_START
| DIO_WAIT
, &bh
);
785 spin_lock(&ip
->i_spin
);
786 if (*bh_slot
!= bh
) {
791 spin_unlock(&ip
->i_spin
);
795 if (gfs2_assert_warn(ip
->i_sbd
, height
)) {
799 gfs2_trans_add_bh(ip
->i_gl
, bh
, 1);
800 gfs2_metatype_set(bh
, GFS2_METATYPE_IN
, GFS2_FORMAT_IN
);
801 gfs2_buffer_clear_tail(bh
, sizeof(struct gfs2_meta_header
));
803 } else if (gfs2_metatype_check(ip
->i_sbd
, bh
,
804 (height
) ? GFS2_METATYPE_IN
: GFS2_METATYPE_DI
)) {
815 * gfs2_meta_ra - start readahead on an extent of a file
816 * @gl: the glock the blocks belong to
817 * @dblock: the starting disk block
818 * @extlen: the number of blocks in the extent
822 void gfs2_meta_ra(struct gfs2_glock
*gl
, uint64_t dblock
, uint32_t extlen
)
824 struct gfs2_sbd
*sdp
= gl
->gl_sbd
;
825 struct inode
*aspace
= gl
->gl_aspace
;
826 struct buffer_head
*first_bh
, *bh
;
827 uint32_t max_ra
= gfs2_tune_get(sdp
, gt_max_readahead
) >>
828 sdp
->sd_sb
.sb_bsize_shift
;
831 if (!extlen
|| !max_ra
)
836 first_bh
= getbuf(sdp
, aspace
, dblock
, CREATE
);
838 if (buffer_uptodate(first_bh
))
840 if (!buffer_locked(first_bh
)) {
841 error
= gfs2_meta_reread(sdp
, first_bh
, DIO_START
);
850 bh
= getbuf(sdp
, aspace
, dblock
, CREATE
);
852 if (!buffer_uptodate(bh
) && !buffer_locked(bh
)) {
853 error
= gfs2_meta_reread(sdp
, bh
, DIO_START
);
863 if (buffer_uptodate(first_bh
))
872 * gfs2_meta_syncfs - sync all the buffers in a filesystem
873 * @sdp: the filesystem
877 void gfs2_meta_syncfs(struct gfs2_sbd
*sdp
)
881 gfs2_ail1_start(sdp
, DIO_ALL
);
882 if (gfs2_ail1_empty(sdp
, DIO_ALL
))