2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 #include <linux/stddef.h>
20 #include <linux/errno.h>
21 #include <linux/gfp.h>
22 #include <linux/pagemap.h>
23 #include <linux/init.h>
24 #include <linux/vmalloc.h>
25 #include <linux/bio.h>
26 #include <linux/sysctl.h>
27 #include <linux/proc_fs.h>
28 #include <linux/workqueue.h>
29 #include <linux/percpu.h>
30 #include <linux/blkdev.h>
31 #include <linux/hash.h>
32 #include <linux/kthread.h>
33 #include <linux/migrate.h>
34 #include <linux/backing-dev.h>
35 #include <linux/freezer.h>
36 #include <linux/list_sort.h>
42 #include "xfs_mount.h"
43 #include "xfs_trace.h"
45 static kmem_zone_t
*xfs_buf_zone
;
46 STATIC
int xfsbufd(void *);
47 STATIC
void xfs_buf_delwri_queue(xfs_buf_t
*, int);
49 static struct workqueue_struct
*xfslogd_workqueue
;
50 struct workqueue_struct
*xfsdatad_workqueue
;
51 struct workqueue_struct
*xfsconvertd_workqueue
;
53 #ifdef XFS_BUF_LOCK_TRACKING
54 # define XB_SET_OWNER(bp) ((bp)->b_last_holder = current->pid)
55 # define XB_CLEAR_OWNER(bp) ((bp)->b_last_holder = -1)
56 # define XB_GET_OWNER(bp) ((bp)->b_last_holder)
58 # define XB_SET_OWNER(bp) do { } while (0)
59 # define XB_CLEAR_OWNER(bp) do { } while (0)
60 # define XB_GET_OWNER(bp) do { } while (0)
63 #define xb_to_gfp(flags) \
64 ((((flags) & XBF_READ_AHEAD) ? __GFP_NORETRY : \
65 ((flags) & XBF_DONT_BLOCK) ? GFP_NOFS : GFP_KERNEL) | __GFP_NOWARN)
67 #define xb_to_km(flags) \
68 (((flags) & XBF_DONT_BLOCK) ? KM_NOFS : KM_SLEEP)
70 #define xfs_buf_allocate(flags) \
71 kmem_zone_alloc(xfs_buf_zone, xb_to_km(flags))
72 #define xfs_buf_deallocate(bp) \
73 kmem_zone_free(xfs_buf_zone, (bp));
80 * Return true if the buffer is vmapped.
82 * The XBF_MAPPED flag is set if the buffer should be mapped, but the
83 * code is clever enough to know it doesn't have to map a single page,
84 * so the check has to be both for XBF_MAPPED and bp->b_page_count > 1.
86 return (bp
->b_flags
& XBF_MAPPED
) && bp
->b_page_count
> 1;
93 return (bp
->b_page_count
* PAGE_SIZE
) - bp
->b_offset
;
97 * xfs_buf_lru_add - add a buffer to the LRU.
99 * The LRU takes a new reference to the buffer so that it will only be freed
100 * once the shrinker takes the buffer off the LRU.
106 struct xfs_buftarg
*btp
= bp
->b_target
;
108 spin_lock(&btp
->bt_lru_lock
);
109 if (list_empty(&bp
->b_lru
)) {
110 atomic_inc(&bp
->b_hold
);
111 list_add_tail(&bp
->b_lru
, &btp
->bt_lru
);
114 spin_unlock(&btp
->bt_lru_lock
);
118 * xfs_buf_lru_del - remove a buffer from the LRU
120 * The unlocked check is safe here because it only occurs when there are not
121 * b_lru_ref counts left on the inode under the pag->pag_buf_lock. it is there
122 * to optimise the shrinker removing the buffer from the LRU and calling
123 * xfs_buf_free(). i.e. it removes an unnecessary round trip on the
130 struct xfs_buftarg
*btp
= bp
->b_target
;
132 if (list_empty(&bp
->b_lru
))
135 spin_lock(&btp
->bt_lru_lock
);
136 if (!list_empty(&bp
->b_lru
)) {
137 list_del_init(&bp
->b_lru
);
140 spin_unlock(&btp
->bt_lru_lock
);
144 * When we mark a buffer stale, we remove the buffer from the LRU and clear the
145 * b_lru_ref count so that the buffer is freed immediately when the buffer
146 * reference count falls to zero. If the buffer is already on the LRU, we need
147 * to remove the reference that LRU holds on the buffer.
149 * This prevents build-up of stale buffers on the LRU.
155 bp
->b_flags
|= XBF_STALE
;
156 atomic_set(&(bp
)->b_lru_ref
, 0);
157 if (!list_empty(&bp
->b_lru
)) {
158 struct xfs_buftarg
*btp
= bp
->b_target
;
160 spin_lock(&btp
->bt_lru_lock
);
161 if (!list_empty(&bp
->b_lru
)) {
162 list_del_init(&bp
->b_lru
);
164 atomic_dec(&bp
->b_hold
);
166 spin_unlock(&btp
->bt_lru_lock
);
168 ASSERT(atomic_read(&bp
->b_hold
) >= 1);
174 xfs_buftarg_t
*target
,
175 xfs_off_t range_base
,
177 xfs_buf_flags_t flags
)
180 * We don't want certain flags to appear in b_flags.
182 flags
&= ~(XBF_LOCK
|XBF_MAPPED
|XBF_DONT_BLOCK
|XBF_READ_AHEAD
);
184 memset(bp
, 0, sizeof(xfs_buf_t
));
185 atomic_set(&bp
->b_hold
, 1);
186 atomic_set(&bp
->b_lru_ref
, 1);
187 init_completion(&bp
->b_iowait
);
188 INIT_LIST_HEAD(&bp
->b_lru
);
189 INIT_LIST_HEAD(&bp
->b_list
);
190 RB_CLEAR_NODE(&bp
->b_rbnode
);
191 sema_init(&bp
->b_sema
, 0); /* held, no waiters */
193 bp
->b_target
= target
;
194 bp
->b_file_offset
= range_base
;
196 * Set buffer_length and count_desired to the same value initially.
197 * I/O routines should use count_desired, which will be the same in
198 * most cases but may be reset (e.g. XFS recovery).
200 bp
->b_buffer_length
= bp
->b_count_desired
= range_length
;
202 bp
->b_bn
= XFS_BUF_DADDR_NULL
;
203 atomic_set(&bp
->b_pin_count
, 0);
204 init_waitqueue_head(&bp
->b_waiters
);
206 XFS_STATS_INC(xb_create
);
208 trace_xfs_buf_init(bp
, _RET_IP_
);
212 * Allocate a page array capable of holding a specified number
213 * of pages, and point the page buf at it.
219 xfs_buf_flags_t flags
)
221 /* Make sure that we have a page list */
222 if (bp
->b_pages
== NULL
) {
223 bp
->b_offset
= xfs_buf_poff(bp
->b_file_offset
);
224 bp
->b_page_count
= page_count
;
225 if (page_count
<= XB_PAGES
) {
226 bp
->b_pages
= bp
->b_page_array
;
228 bp
->b_pages
= kmem_alloc(sizeof(struct page
*) *
229 page_count
, xb_to_km(flags
));
230 if (bp
->b_pages
== NULL
)
233 memset(bp
->b_pages
, 0, sizeof(struct page
*) * page_count
);
239 * Frees b_pages if it was allocated.
245 if (bp
->b_pages
!= bp
->b_page_array
) {
246 kmem_free(bp
->b_pages
);
252 * Releases the specified buffer.
254 * The modification state of any associated pages is left unchanged.
255 * The buffer most not be on any hash - use xfs_buf_rele instead for
256 * hashed and refcounted buffers
262 trace_xfs_buf_free(bp
, _RET_IP_
);
264 ASSERT(list_empty(&bp
->b_lru
));
266 if (bp
->b_flags
& _XBF_PAGES
) {
269 if (xfs_buf_is_vmapped(bp
))
270 vm_unmap_ram(bp
->b_addr
- bp
->b_offset
,
273 for (i
= 0; i
< bp
->b_page_count
; i
++) {
274 struct page
*page
= bp
->b_pages
[i
];
278 } else if (bp
->b_flags
& _XBF_KMEM
)
279 kmem_free(bp
->b_addr
);
280 _xfs_buf_free_pages(bp
);
281 xfs_buf_deallocate(bp
);
285 * Allocates all the pages for buffer in question and builds it's page list.
288 xfs_buf_allocate_memory(
292 size_t size
= bp
->b_count_desired
;
293 size_t nbytes
, offset
;
294 gfp_t gfp_mask
= xb_to_gfp(flags
);
295 unsigned short page_count
, i
;
301 * for buffers that are contained within a single page, just allocate
302 * the memory from the heap - there's no need for the complexity of
303 * page arrays to keep allocation down to order 0.
305 if (bp
->b_buffer_length
< PAGE_SIZE
) {
306 bp
->b_addr
= kmem_alloc(bp
->b_buffer_length
, xb_to_km(flags
));
308 /* low memory - use alloc_page loop instead */
312 if (((unsigned long)(bp
->b_addr
+ bp
->b_buffer_length
- 1) &
314 ((unsigned long)bp
->b_addr
& PAGE_MASK
)) {
315 /* b_addr spans two pages - use alloc_page instead */
316 kmem_free(bp
->b_addr
);
320 bp
->b_offset
= offset_in_page(bp
->b_addr
);
321 bp
->b_pages
= bp
->b_page_array
;
322 bp
->b_pages
[0] = virt_to_page(bp
->b_addr
);
323 bp
->b_page_count
= 1;
324 bp
->b_flags
|= XBF_MAPPED
| _XBF_KMEM
;
329 end
= bp
->b_file_offset
+ bp
->b_buffer_length
;
330 page_count
= xfs_buf_btoc(end
) - xfs_buf_btoct(bp
->b_file_offset
);
331 error
= _xfs_buf_get_pages(bp
, page_count
, flags
);
335 offset
= bp
->b_offset
;
336 first
= bp
->b_file_offset
>> PAGE_SHIFT
;
337 bp
->b_flags
|= _XBF_PAGES
;
339 for (i
= 0; i
< bp
->b_page_count
; i
++) {
343 page
= alloc_page(gfp_mask
);
344 if (unlikely(page
== NULL
)) {
345 if (flags
& XBF_READ_AHEAD
) {
346 bp
->b_page_count
= i
;
352 * This could deadlock.
354 * But until all the XFS lowlevel code is revamped to
355 * handle buffer allocation failures we can't do much.
357 if (!(++retries
% 100))
359 "possible memory allocation deadlock in %s (mode:0x%x)",
362 XFS_STATS_INC(xb_page_retries
);
363 congestion_wait(BLK_RW_ASYNC
, HZ
/50);
367 XFS_STATS_INC(xb_page_found
);
369 nbytes
= min_t(size_t, size
, PAGE_SIZE
- offset
);
371 bp
->b_pages
[i
] = page
;
377 for (i
= 0; i
< bp
->b_page_count
; i
++)
378 __free_page(bp
->b_pages
[i
]);
383 * Map buffer into kernel address-space if necessary.
390 ASSERT(bp
->b_flags
& _XBF_PAGES
);
391 if (bp
->b_page_count
== 1) {
392 /* A single page buffer is always mappable */
393 bp
->b_addr
= page_address(bp
->b_pages
[0]) + bp
->b_offset
;
394 bp
->b_flags
|= XBF_MAPPED
;
395 } else if (flags
& XBF_MAPPED
) {
399 bp
->b_addr
= vm_map_ram(bp
->b_pages
, bp
->b_page_count
,
404 } while (retried
++ <= 1);
408 bp
->b_addr
+= bp
->b_offset
;
409 bp
->b_flags
|= XBF_MAPPED
;
416 * Finding and Reading Buffers
420 * Look up, and creates if absent, a lockable buffer for
421 * a given range of an inode. The buffer is returned
422 * locked. If other overlapping buffers exist, they are
423 * released before the new buffer is created and locked,
424 * which may imply that this call will block until those buffers
425 * are unlocked. No I/O is implied by this call.
429 xfs_buftarg_t
*btp
, /* block device target */
430 xfs_off_t ioff
, /* starting offset of range */
431 size_t isize
, /* length of range */
432 xfs_buf_flags_t flags
,
435 xfs_off_t range_base
;
437 struct xfs_perag
*pag
;
438 struct rb_node
**rbp
;
439 struct rb_node
*parent
;
442 range_base
= (ioff
<< BBSHIFT
);
443 range_length
= (isize
<< BBSHIFT
);
445 /* Check for IOs smaller than the sector size / not sector aligned */
446 ASSERT(!(range_length
< (1 << btp
->bt_sshift
)));
447 ASSERT(!(range_base
& (xfs_off_t
)btp
->bt_smask
));
450 pag
= xfs_perag_get(btp
->bt_mount
,
451 xfs_daddr_to_agno(btp
->bt_mount
, ioff
));
454 spin_lock(&pag
->pag_buf_lock
);
455 rbp
= &pag
->pag_buf_tree
.rb_node
;
460 bp
= rb_entry(parent
, struct xfs_buf
, b_rbnode
);
462 if (range_base
< bp
->b_file_offset
)
463 rbp
= &(*rbp
)->rb_left
;
464 else if (range_base
> bp
->b_file_offset
)
465 rbp
= &(*rbp
)->rb_right
;
468 * found a block offset match. If the range doesn't
469 * match, the only way this is allowed is if the buffer
470 * in the cache is stale and the transaction that made
471 * it stale has not yet committed. i.e. we are
472 * reallocating a busy extent. Skip this buffer and
473 * continue searching to the right for an exact match.
475 if (bp
->b_buffer_length
!= range_length
) {
476 ASSERT(bp
->b_flags
& XBF_STALE
);
477 rbp
= &(*rbp
)->rb_right
;
480 atomic_inc(&bp
->b_hold
);
487 _xfs_buf_initialize(new_bp
, btp
, range_base
,
488 range_length
, flags
);
489 rb_link_node(&new_bp
->b_rbnode
, parent
, rbp
);
490 rb_insert_color(&new_bp
->b_rbnode
, &pag
->pag_buf_tree
);
491 /* the buffer keeps the perag reference until it is freed */
493 spin_unlock(&pag
->pag_buf_lock
);
495 XFS_STATS_INC(xb_miss_locked
);
496 spin_unlock(&pag
->pag_buf_lock
);
502 spin_unlock(&pag
->pag_buf_lock
);
505 if (xfs_buf_cond_lock(bp
)) {
506 /* failed, so wait for the lock if requested. */
507 if (!(flags
& XBF_TRYLOCK
)) {
509 XFS_STATS_INC(xb_get_locked_waited
);
512 XFS_STATS_INC(xb_busy_locked
);
518 * if the buffer is stale, clear all the external state associated with
519 * it. We need to keep flags such as how we allocated the buffer memory
522 if (bp
->b_flags
& XBF_STALE
) {
523 ASSERT((bp
->b_flags
& _XBF_DELWRI_Q
) == 0);
524 bp
->b_flags
&= XBF_MAPPED
| _XBF_KMEM
| _XBF_PAGES
;
527 trace_xfs_buf_find(bp
, flags
, _RET_IP_
);
528 XFS_STATS_INC(xb_get_locked
);
533 * Assembles a buffer covering the specified range.
534 * Storage in memory for all portions of the buffer will be allocated,
535 * although backing storage may not be.
539 xfs_buftarg_t
*target
,/* target for buffer */
540 xfs_off_t ioff
, /* starting offset of range */
541 size_t isize
, /* length of range */
542 xfs_buf_flags_t flags
)
544 xfs_buf_t
*bp
, *new_bp
;
547 new_bp
= xfs_buf_allocate(flags
);
548 if (unlikely(!new_bp
))
551 bp
= _xfs_buf_find(target
, ioff
, isize
, flags
, new_bp
);
553 error
= xfs_buf_allocate_memory(bp
, flags
);
557 xfs_buf_deallocate(new_bp
);
558 if (unlikely(bp
== NULL
))
562 if (!(bp
->b_flags
& XBF_MAPPED
)) {
563 error
= _xfs_buf_map_pages(bp
, flags
);
564 if (unlikely(error
)) {
565 xfs_warn(target
->bt_mount
,
566 "%s: failed to map pages\n", __func__
);
571 XFS_STATS_INC(xb_get
);
574 * Always fill in the block number now, the mapped cases can do
575 * their own overlay of this later.
578 bp
->b_count_desired
= bp
->b_buffer_length
;
580 trace_xfs_buf_get(bp
, flags
, _RET_IP_
);
584 if (flags
& (XBF_LOCK
| XBF_TRYLOCK
))
593 xfs_buf_flags_t flags
)
597 ASSERT(!(flags
& (XBF_DELWRI
|XBF_WRITE
)));
598 ASSERT(bp
->b_bn
!= XFS_BUF_DADDR_NULL
);
600 bp
->b_flags
&= ~(XBF_WRITE
| XBF_ASYNC
| XBF_DELWRI
| \
601 XBF_READ_AHEAD
| _XBF_RUN_QUEUES
);
602 bp
->b_flags
|= flags
& (XBF_READ
| XBF_ASYNC
| \
603 XBF_READ_AHEAD
| _XBF_RUN_QUEUES
);
605 status
= xfs_buf_iorequest(bp
);
606 if (status
|| XFS_BUF_ISERROR(bp
) || (flags
& XBF_ASYNC
))
608 return xfs_buf_iowait(bp
);
613 xfs_buftarg_t
*target
,
616 xfs_buf_flags_t flags
)
622 bp
= xfs_buf_get(target
, ioff
, isize
, flags
);
624 trace_xfs_buf_read(bp
, flags
, _RET_IP_
);
626 if (!XFS_BUF_ISDONE(bp
)) {
627 XFS_STATS_INC(xb_get_read
);
628 _xfs_buf_read(bp
, flags
);
629 } else if (flags
& XBF_ASYNC
) {
631 * Read ahead call which is already satisfied,
636 /* We do not want read in the flags */
637 bp
->b_flags
&= ~XBF_READ
;
644 if (flags
& (XBF_LOCK
| XBF_TRYLOCK
))
651 * If we are not low on memory then do the readahead in a deadlock
656 xfs_buftarg_t
*target
,
660 struct backing_dev_info
*bdi
;
662 if (bdi_read_congested(target
->bt_bdi
))
665 xfs_buf_read(target
, ioff
, isize
,
666 XBF_TRYLOCK
|XBF_ASYNC
|XBF_READ_AHEAD
|XBF_DONT_BLOCK
);
670 * Read an uncached buffer from disk. Allocates and returns a locked
671 * buffer containing the disk contents or nothing.
674 xfs_buf_read_uncached(
675 struct xfs_mount
*mp
,
676 struct xfs_buftarg
*target
,
684 bp
= xfs_buf_get_uncached(target
, length
, flags
);
688 /* set up the buffer for a read IO */
690 XFS_BUF_SET_ADDR(bp
, daddr
);
695 error
= xfs_buf_iowait(bp
);
696 if (error
|| bp
->b_error
) {
706 xfs_buftarg_t
*target
)
710 bp
= xfs_buf_allocate(0);
712 _xfs_buf_initialize(bp
, target
, 0, len
, 0);
716 static inline struct page
*
720 if ((!is_vmalloc_addr(addr
))) {
721 return virt_to_page(addr
);
723 return vmalloc_to_page(addr
);
728 xfs_buf_associate_memory(
735 unsigned long pageaddr
;
736 unsigned long offset
;
740 pageaddr
= (unsigned long)mem
& PAGE_MASK
;
741 offset
= (unsigned long)mem
- pageaddr
;
742 buflen
= PAGE_ALIGN(len
+ offset
);
743 page_count
= buflen
>> PAGE_SHIFT
;
745 /* Free any previous set of page pointers */
747 _xfs_buf_free_pages(bp
);
752 rval
= _xfs_buf_get_pages(bp
, page_count
, XBF_DONT_BLOCK
);
756 bp
->b_offset
= offset
;
758 for (i
= 0; i
< bp
->b_page_count
; i
++) {
759 bp
->b_pages
[i
] = mem_to_page((void *)pageaddr
);
760 pageaddr
+= PAGE_SIZE
;
763 bp
->b_count_desired
= len
;
764 bp
->b_buffer_length
= buflen
;
765 bp
->b_flags
|= XBF_MAPPED
;
771 xfs_buf_get_uncached(
772 struct xfs_buftarg
*target
,
776 unsigned long page_count
= PAGE_ALIGN(len
) >> PAGE_SHIFT
;
780 bp
= xfs_buf_allocate(0);
781 if (unlikely(bp
== NULL
))
783 _xfs_buf_initialize(bp
, target
, 0, len
, 0);
785 error
= _xfs_buf_get_pages(bp
, page_count
, 0);
789 for (i
= 0; i
< page_count
; i
++) {
790 bp
->b_pages
[i
] = alloc_page(xb_to_gfp(flags
));
794 bp
->b_flags
|= _XBF_PAGES
;
796 error
= _xfs_buf_map_pages(bp
, XBF_MAPPED
);
797 if (unlikely(error
)) {
798 xfs_warn(target
->bt_mount
,
799 "%s: failed to map pages\n", __func__
);
805 trace_xfs_buf_get_uncached(bp
, _RET_IP_
);
810 __free_page(bp
->b_pages
[i
]);
811 _xfs_buf_free_pages(bp
);
813 xfs_buf_deallocate(bp
);
819 * Increment reference count on buffer, to hold the buffer concurrently
820 * with another thread which may release (free) the buffer asynchronously.
821 * Must hold the buffer already to call this function.
827 trace_xfs_buf_hold(bp
, _RET_IP_
);
828 atomic_inc(&bp
->b_hold
);
832 * Releases a hold on the specified buffer. If the
833 * the hold count is 1, calls xfs_buf_free.
839 struct xfs_perag
*pag
= bp
->b_pag
;
841 trace_xfs_buf_rele(bp
, _RET_IP_
);
844 ASSERT(list_empty(&bp
->b_lru
));
845 ASSERT(RB_EMPTY_NODE(&bp
->b_rbnode
));
846 if (atomic_dec_and_test(&bp
->b_hold
))
851 ASSERT(!RB_EMPTY_NODE(&bp
->b_rbnode
));
853 ASSERT(atomic_read(&bp
->b_hold
) > 0);
854 if (atomic_dec_and_lock(&bp
->b_hold
, &pag
->pag_buf_lock
)) {
855 if (!(bp
->b_flags
& XBF_STALE
) &&
856 atomic_read(&bp
->b_lru_ref
)) {
858 spin_unlock(&pag
->pag_buf_lock
);
861 ASSERT(!(bp
->b_flags
& (XBF_DELWRI
|_XBF_DELWRI_Q
)));
862 rb_erase(&bp
->b_rbnode
, &pag
->pag_buf_tree
);
863 spin_unlock(&pag
->pag_buf_lock
);
872 * Lock a buffer object, if it is not already locked.
874 * If we come across a stale, pinned, locked buffer, we know that we are
875 * being asked to lock a buffer that has been reallocated. Because it is
876 * pinned, we know that the log has not been pushed to disk and hence it
877 * will still be locked. Rather than continuing to have trylock attempts
878 * fail until someone else pushes the log, push it ourselves before
879 * returning. This means that the xfsaild will not get stuck trying
880 * to push on stale inode buffers.
888 locked
= down_trylock(&bp
->b_sema
) == 0;
891 else if (atomic_read(&bp
->b_pin_count
) && (bp
->b_flags
& XBF_STALE
))
892 xfs_log_force(bp
->b_target
->bt_mount
, 0);
894 trace_xfs_buf_cond_lock(bp
, _RET_IP_
);
895 return locked
? 0 : -EBUSY
;
902 return bp
->b_sema
.count
;
906 * Lock a buffer object.
908 * If we come across a stale, pinned, locked buffer, we know that we
909 * are being asked to lock a buffer that has been reallocated. Because
910 * it is pinned, we know that the log has not been pushed to disk and
911 * hence it will still be locked. Rather than sleeping until someone
912 * else pushes the log, push it ourselves before trying to get the lock.
918 trace_xfs_buf_lock(bp
, _RET_IP_
);
920 if (atomic_read(&bp
->b_pin_count
) && (bp
->b_flags
& XBF_STALE
))
921 xfs_log_force(bp
->b_target
->bt_mount
, 0);
922 if (atomic_read(&bp
->b_io_remaining
))
923 blk_flush_plug(current
);
927 trace_xfs_buf_lock_done(bp
, _RET_IP_
);
931 * Releases the lock on the buffer object.
932 * If the buffer is marked delwri but is not queued, do so before we
933 * unlock the buffer as we need to set flags correctly. We also need to
934 * take a reference for the delwri queue because the unlocker is going to
935 * drop their's and they don't know we just queued it.
941 if ((bp
->b_flags
& (XBF_DELWRI
|_XBF_DELWRI_Q
)) == XBF_DELWRI
) {
942 atomic_inc(&bp
->b_hold
);
943 bp
->b_flags
|= XBF_ASYNC
;
944 xfs_buf_delwri_queue(bp
, 0);
950 trace_xfs_buf_unlock(bp
, _RET_IP_
);
957 DECLARE_WAITQUEUE (wait
, current
);
959 if (atomic_read(&bp
->b_pin_count
) == 0)
962 add_wait_queue(&bp
->b_waiters
, &wait
);
964 set_current_state(TASK_UNINTERRUPTIBLE
);
965 if (atomic_read(&bp
->b_pin_count
) == 0)
969 remove_wait_queue(&bp
->b_waiters
, &wait
);
970 set_current_state(TASK_RUNNING
);
974 * Buffer Utility Routines
979 struct work_struct
*work
)
982 container_of(work
, xfs_buf_t
, b_iodone_work
);
985 (*(bp
->b_iodone
))(bp
);
986 else if (bp
->b_flags
& XBF_ASYNC
)
995 trace_xfs_buf_iodone(bp
, _RET_IP_
);
997 bp
->b_flags
&= ~(XBF_READ
| XBF_WRITE
| XBF_READ_AHEAD
);
998 if (bp
->b_error
== 0)
999 bp
->b_flags
|= XBF_DONE
;
1001 if ((bp
->b_iodone
) || (bp
->b_flags
& XBF_ASYNC
)) {
1003 INIT_WORK(&bp
->b_iodone_work
, xfs_buf_iodone_work
);
1004 queue_work(xfslogd_workqueue
, &bp
->b_iodone_work
);
1006 xfs_buf_iodone_work(&bp
->b_iodone_work
);
1009 complete(&bp
->b_iowait
);
1018 ASSERT(error
>= 0 && error
<= 0xffff);
1019 bp
->b_error
= (unsigned short)error
;
1020 trace_xfs_buf_ioerror(bp
, error
, _RET_IP_
);
1025 struct xfs_mount
*mp
,
1030 bp
->b_flags
|= XBF_WRITE
;
1031 bp
->b_flags
&= ~(XBF_ASYNC
| XBF_READ
);
1033 xfs_buf_delwri_dequeue(bp
);
1036 error
= xfs_buf_iowait(bp
);
1038 xfs_force_shutdown(mp
, SHUTDOWN_META_IO_ERROR
);
1048 trace_xfs_buf_bdwrite(bp
, _RET_IP_
);
1050 bp
->b_flags
&= ~XBF_READ
;
1051 bp
->b_flags
|= (XBF_DELWRI
| XBF_ASYNC
);
1053 xfs_buf_delwri_queue(bp
, 1);
1057 * Called when we want to stop a buffer from getting written or read.
1058 * We attach the EIO error, muck with its flags, and call xfs_buf_ioend
1059 * so that the proper iodone callbacks get called.
1065 #ifdef XFSERRORDEBUG
1066 ASSERT(XFS_BUF_ISREAD(bp
) || bp
->b_iodone
);
1070 * No need to wait until the buffer is unpinned, we aren't flushing it.
1072 XFS_BUF_ERROR(bp
, EIO
);
1075 * We're calling xfs_buf_ioend, so delete XBF_DONE flag.
1078 XFS_BUF_UNDELAYWRITE(bp
);
1082 xfs_buf_ioend(bp
, 0);
1088 * Same as xfs_bioerror, except that we are releasing the buffer
1089 * here ourselves, and avoiding the xfs_buf_ioend call.
1090 * This is meant for userdata errors; metadata bufs come with
1091 * iodone functions attached, so that we can track down errors.
1097 int64_t fl
= XFS_BUF_BFLAGS(bp
);
1099 * No need to wait until the buffer is unpinned.
1100 * We aren't flushing it.
1102 * chunkhold expects B_DONE to be set, whether
1103 * we actually finish the I/O or not. We don't want to
1104 * change that interface.
1107 XFS_BUF_UNDELAYWRITE(bp
);
1110 XFS_BUF_CLR_IODONE_FUNC(bp
);
1111 if (!(fl
& XBF_ASYNC
)) {
1113 * Mark b_error and B_ERROR _both_.
1114 * Lot's of chunkcache code assumes that.
1115 * There's no reason to mark error for
1118 XFS_BUF_ERROR(bp
, EIO
);
1119 XFS_BUF_FINISH_IOWAIT(bp
);
1129 * All xfs metadata buffers except log state machine buffers
1130 * get this attached as their b_bdstrat callback function.
1131 * This is so that we can catch a buffer
1132 * after prematurely unpinning it to forcibly shutdown the filesystem.
1138 if (XFS_FORCED_SHUTDOWN(bp
->b_target
->bt_mount
)) {
1139 trace_xfs_bdstrat_shut(bp
, _RET_IP_
);
1141 * Metadata write that didn't get logged but
1142 * written delayed anyway. These aren't associated
1143 * with a transaction, and can be ignored.
1145 if (!bp
->b_iodone
&& !XFS_BUF_ISREAD(bp
))
1146 return xfs_bioerror_relse(bp
);
1148 return xfs_bioerror(bp
);
1151 xfs_buf_iorequest(bp
);
1156 * Wrapper around bdstrat so that we can stop data from going to disk in case
1157 * we are shutting down the filesystem. Typically user data goes thru this
1158 * path; one of the exceptions is the superblock.
1162 struct xfs_mount
*mp
,
1165 if (XFS_FORCED_SHUTDOWN(mp
)) {
1166 trace_xfs_bdstrat_shut(bp
, _RET_IP_
);
1167 xfs_bioerror_relse(bp
);
1171 xfs_buf_iorequest(bp
);
1179 if (atomic_dec_and_test(&bp
->b_io_remaining
) == 1)
1180 xfs_buf_ioend(bp
, schedule
);
1188 xfs_buf_t
*bp
= (xfs_buf_t
*)bio
->bi_private
;
1190 xfs_buf_ioerror(bp
, -error
);
1192 if (!error
&& xfs_buf_is_vmapped(bp
) && (bp
->b_flags
& XBF_READ
))
1193 invalidate_kernel_vmap_range(bp
->b_addr
, xfs_buf_vmap_len(bp
));
1195 _xfs_buf_ioend(bp
, 1);
1203 int rw
, map_i
, total_nr_pages
, nr_pages
;
1205 int offset
= bp
->b_offset
;
1206 int size
= bp
->b_count_desired
;
1207 sector_t sector
= bp
->b_bn
;
1209 total_nr_pages
= bp
->b_page_count
;
1212 if (bp
->b_flags
& XBF_ORDERED
) {
1213 ASSERT(!(bp
->b_flags
& XBF_READ
));
1214 rw
= WRITE_FLUSH_FUA
;
1215 } else if (bp
->b_flags
& XBF_LOG_BUFFER
) {
1216 ASSERT(!(bp
->b_flags
& XBF_READ_AHEAD
));
1217 bp
->b_flags
&= ~_XBF_RUN_QUEUES
;
1218 rw
= (bp
->b_flags
& XBF_WRITE
) ? WRITE_SYNC
: READ_SYNC
;
1219 } else if (bp
->b_flags
& _XBF_RUN_QUEUES
) {
1220 ASSERT(!(bp
->b_flags
& XBF_READ_AHEAD
));
1221 bp
->b_flags
&= ~_XBF_RUN_QUEUES
;
1222 rw
= (bp
->b_flags
& XBF_WRITE
) ? WRITE_META
: READ_META
;
1224 rw
= (bp
->b_flags
& XBF_WRITE
) ? WRITE
:
1225 (bp
->b_flags
& XBF_READ_AHEAD
) ? READA
: READ
;
1230 atomic_inc(&bp
->b_io_remaining
);
1231 nr_pages
= BIO_MAX_SECTORS
>> (PAGE_SHIFT
- BBSHIFT
);
1232 if (nr_pages
> total_nr_pages
)
1233 nr_pages
= total_nr_pages
;
1235 bio
= bio_alloc(GFP_NOIO
, nr_pages
);
1236 bio
->bi_bdev
= bp
->b_target
->bt_bdev
;
1237 bio
->bi_sector
= sector
;
1238 bio
->bi_end_io
= xfs_buf_bio_end_io
;
1239 bio
->bi_private
= bp
;
1242 for (; size
&& nr_pages
; nr_pages
--, map_i
++) {
1243 int rbytes
, nbytes
= PAGE_SIZE
- offset
;
1248 rbytes
= bio_add_page(bio
, bp
->b_pages
[map_i
], nbytes
, offset
);
1249 if (rbytes
< nbytes
)
1253 sector
+= nbytes
>> BBSHIFT
;
1258 if (likely(bio
->bi_size
)) {
1259 if (xfs_buf_is_vmapped(bp
)) {
1260 flush_kernel_vmap_range(bp
->b_addr
,
1261 xfs_buf_vmap_len(bp
));
1263 submit_bio(rw
, bio
);
1267 xfs_buf_ioerror(bp
, EIO
);
1276 trace_xfs_buf_iorequest(bp
, _RET_IP_
);
1278 if (bp
->b_flags
& XBF_DELWRI
) {
1279 xfs_buf_delwri_queue(bp
, 1);
1283 if (bp
->b_flags
& XBF_WRITE
) {
1284 xfs_buf_wait_unpin(bp
);
1289 /* Set the count to 1 initially, this will stop an I/O
1290 * completion callout which happens before we have started
1291 * all the I/O from calling xfs_buf_ioend too early.
1293 atomic_set(&bp
->b_io_remaining
, 1);
1294 _xfs_buf_ioapply(bp
);
1295 _xfs_buf_ioend(bp
, 0);
1302 * Waits for I/O to complete on the buffer supplied.
1303 * It returns immediately if no I/O is pending.
1304 * It returns the I/O error code, if any, or 0 if there was no error.
1310 trace_xfs_buf_iowait(bp
, _RET_IP_
);
1312 if (atomic_read(&bp
->b_io_remaining
))
1313 blk_flush_plug(current
);
1314 wait_for_completion(&bp
->b_iowait
);
1316 trace_xfs_buf_iowait_done(bp
, _RET_IP_
);
1327 if (bp
->b_flags
& XBF_MAPPED
)
1328 return XFS_BUF_PTR(bp
) + offset
;
1330 offset
+= bp
->b_offset
;
1331 page
= bp
->b_pages
[offset
>> PAGE_SHIFT
];
1332 return (xfs_caddr_t
)page_address(page
) + (offset
& (PAGE_SIZE
-1));
1336 * Move data into or out of a buffer.
1340 xfs_buf_t
*bp
, /* buffer to process */
1341 size_t boff
, /* starting buffer offset */
1342 size_t bsize
, /* length to copy */
1343 void *data
, /* data address */
1344 xfs_buf_rw_t mode
) /* read/write/zero flag */
1346 size_t bend
, cpoff
, csize
;
1349 bend
= boff
+ bsize
;
1350 while (boff
< bend
) {
1351 page
= bp
->b_pages
[xfs_buf_btoct(boff
+ bp
->b_offset
)];
1352 cpoff
= xfs_buf_poff(boff
+ bp
->b_offset
);
1353 csize
= min_t(size_t,
1354 PAGE_SIZE
-cpoff
, bp
->b_count_desired
-boff
);
1356 ASSERT(((csize
+ cpoff
) <= PAGE_SIZE
));
1360 memset(page_address(page
) + cpoff
, 0, csize
);
1363 memcpy(data
, page_address(page
) + cpoff
, csize
);
1366 memcpy(page_address(page
) + cpoff
, data
, csize
);
1375 * Handling of buffer targets (buftargs).
1379 * Wait for any bufs with callbacks that have been submitted but have not yet
1380 * returned. These buffers will have an elevated hold count, so wait on those
1381 * while freeing all the buffers only held by the LRU.
1385 struct xfs_buftarg
*btp
)
1390 spin_lock(&btp
->bt_lru_lock
);
1391 while (!list_empty(&btp
->bt_lru
)) {
1392 bp
= list_first_entry(&btp
->bt_lru
, struct xfs_buf
, b_lru
);
1393 if (atomic_read(&bp
->b_hold
) > 1) {
1394 spin_unlock(&btp
->bt_lru_lock
);
1399 * clear the LRU reference count so the bufer doesn't get
1400 * ignored in xfs_buf_rele().
1402 atomic_set(&bp
->b_lru_ref
, 0);
1403 spin_unlock(&btp
->bt_lru_lock
);
1405 spin_lock(&btp
->bt_lru_lock
);
1407 spin_unlock(&btp
->bt_lru_lock
);
1412 struct shrinker
*shrink
,
1416 struct xfs_buftarg
*btp
= container_of(shrink
,
1417 struct xfs_buftarg
, bt_shrinker
);
1422 return btp
->bt_lru_nr
;
1424 spin_lock(&btp
->bt_lru_lock
);
1425 while (!list_empty(&btp
->bt_lru
)) {
1426 if (nr_to_scan
-- <= 0)
1429 bp
= list_first_entry(&btp
->bt_lru
, struct xfs_buf
, b_lru
);
1432 * Decrement the b_lru_ref count unless the value is already
1433 * zero. If the value is already zero, we need to reclaim the
1434 * buffer, otherwise it gets another trip through the LRU.
1436 if (!atomic_add_unless(&bp
->b_lru_ref
, -1, 0)) {
1437 list_move_tail(&bp
->b_lru
, &btp
->bt_lru
);
1442 * remove the buffer from the LRU now to avoid needing another
1443 * lock round trip inside xfs_buf_rele().
1445 list_move(&bp
->b_lru
, &dispose
);
1448 spin_unlock(&btp
->bt_lru_lock
);
1450 while (!list_empty(&dispose
)) {
1451 bp
= list_first_entry(&dispose
, struct xfs_buf
, b_lru
);
1452 list_del_init(&bp
->b_lru
);
1456 return btp
->bt_lru_nr
;
1461 struct xfs_mount
*mp
,
1462 struct xfs_buftarg
*btp
)
1464 unregister_shrinker(&btp
->bt_shrinker
);
1466 xfs_flush_buftarg(btp
, 1);
1467 if (mp
->m_flags
& XFS_MOUNT_BARRIER
)
1468 xfs_blkdev_issue_flush(btp
);
1470 kthread_stop(btp
->bt_task
);
1475 xfs_setsize_buftarg_flags(
1477 unsigned int blocksize
,
1478 unsigned int sectorsize
,
1481 btp
->bt_bsize
= blocksize
;
1482 btp
->bt_sshift
= ffs(sectorsize
) - 1;
1483 btp
->bt_smask
= sectorsize
- 1;
1485 if (set_blocksize(btp
->bt_bdev
, sectorsize
)) {
1486 xfs_warn(btp
->bt_mount
,
1487 "Cannot set_blocksize to %u on device %s\n",
1488 sectorsize
, XFS_BUFTARG_NAME(btp
));
1496 * When allocating the initial buffer target we have not yet
1497 * read in the superblock, so don't know what sized sectors
1498 * are being used is at this early stage. Play safe.
1501 xfs_setsize_buftarg_early(
1503 struct block_device
*bdev
)
1505 return xfs_setsize_buftarg_flags(btp
,
1506 PAGE_SIZE
, bdev_logical_block_size(bdev
), 0);
1510 xfs_setsize_buftarg(
1512 unsigned int blocksize
,
1513 unsigned int sectorsize
)
1515 return xfs_setsize_buftarg_flags(btp
, blocksize
, sectorsize
, 1);
1519 xfs_alloc_delwrite_queue(
1523 INIT_LIST_HEAD(&btp
->bt_delwrite_queue
);
1524 spin_lock_init(&btp
->bt_delwrite_lock
);
1526 btp
->bt_task
= kthread_run(xfsbufd
, btp
, "xfsbufd/%s", fsname
);
1527 if (IS_ERR(btp
->bt_task
))
1528 return PTR_ERR(btp
->bt_task
);
1534 struct xfs_mount
*mp
,
1535 struct block_device
*bdev
,
1541 btp
= kmem_zalloc(sizeof(*btp
), KM_SLEEP
);
1544 btp
->bt_dev
= bdev
->bd_dev
;
1545 btp
->bt_bdev
= bdev
;
1546 btp
->bt_bdi
= blk_get_backing_dev_info(bdev
);
1550 INIT_LIST_HEAD(&btp
->bt_lru
);
1551 spin_lock_init(&btp
->bt_lru_lock
);
1552 if (xfs_setsize_buftarg_early(btp
, bdev
))
1554 if (xfs_alloc_delwrite_queue(btp
, fsname
))
1556 btp
->bt_shrinker
.shrink
= xfs_buftarg_shrink
;
1557 btp
->bt_shrinker
.seeks
= DEFAULT_SEEKS
;
1558 register_shrinker(&btp
->bt_shrinker
);
1568 * Delayed write buffer handling
1571 xfs_buf_delwri_queue(
1575 struct list_head
*dwq
= &bp
->b_target
->bt_delwrite_queue
;
1576 spinlock_t
*dwlk
= &bp
->b_target
->bt_delwrite_lock
;
1578 trace_xfs_buf_delwri_queue(bp
, _RET_IP_
);
1580 ASSERT((bp
->b_flags
&(XBF_DELWRI
|XBF_ASYNC
)) == (XBF_DELWRI
|XBF_ASYNC
));
1583 /* If already in the queue, dequeue and place at tail */
1584 if (!list_empty(&bp
->b_list
)) {
1585 ASSERT(bp
->b_flags
& _XBF_DELWRI_Q
);
1587 atomic_dec(&bp
->b_hold
);
1588 list_del(&bp
->b_list
);
1591 if (list_empty(dwq
)) {
1592 /* start xfsbufd as it is about to have something to do */
1593 wake_up_process(bp
->b_target
->bt_task
);
1596 bp
->b_flags
|= _XBF_DELWRI_Q
;
1597 list_add_tail(&bp
->b_list
, dwq
);
1598 bp
->b_queuetime
= jiffies
;
1606 xfs_buf_delwri_dequeue(
1609 spinlock_t
*dwlk
= &bp
->b_target
->bt_delwrite_lock
;
1613 if ((bp
->b_flags
& XBF_DELWRI
) && !list_empty(&bp
->b_list
)) {
1614 ASSERT(bp
->b_flags
& _XBF_DELWRI_Q
);
1615 list_del_init(&bp
->b_list
);
1618 bp
->b_flags
&= ~(XBF_DELWRI
|_XBF_DELWRI_Q
);
1624 trace_xfs_buf_delwri_dequeue(bp
, _RET_IP_
);
1628 * If a delwri buffer needs to be pushed before it has aged out, then promote
1629 * it to the head of the delwri queue so that it will be flushed on the next
1630 * xfsbufd run. We do this by resetting the queuetime of the buffer to be older
1631 * than the age currently needed to flush the buffer. Hence the next time the
1632 * xfsbufd sees it is guaranteed to be considered old enough to flush.
1635 xfs_buf_delwri_promote(
1638 struct xfs_buftarg
*btp
= bp
->b_target
;
1639 long age
= xfs_buf_age_centisecs
* msecs_to_jiffies(10) + 1;
1641 ASSERT(bp
->b_flags
& XBF_DELWRI
);
1642 ASSERT(bp
->b_flags
& _XBF_DELWRI_Q
);
1645 * Check the buffer age before locking the delayed write queue as we
1646 * don't need to promote buffers that are already past the flush age.
1648 if (bp
->b_queuetime
< jiffies
- age
)
1650 bp
->b_queuetime
= jiffies
- age
;
1651 spin_lock(&btp
->bt_delwrite_lock
);
1652 list_move(&bp
->b_list
, &btp
->bt_delwrite_queue
);
1653 spin_unlock(&btp
->bt_delwrite_lock
);
1657 xfs_buf_runall_queues(
1658 struct workqueue_struct
*queue
)
1660 flush_workqueue(queue
);
1664 * Move as many buffers as specified to the supplied list
1665 * idicating if we skipped any buffers to prevent deadlocks.
1668 xfs_buf_delwri_split(
1669 xfs_buftarg_t
*target
,
1670 struct list_head
*list
,
1674 struct list_head
*dwq
= &target
->bt_delwrite_queue
;
1675 spinlock_t
*dwlk
= &target
->bt_delwrite_lock
;
1679 force
= test_and_clear_bit(XBT_FORCE_FLUSH
, &target
->bt_flags
);
1680 INIT_LIST_HEAD(list
);
1682 list_for_each_entry_safe(bp
, n
, dwq
, b_list
) {
1683 ASSERT(bp
->b_flags
& XBF_DELWRI
);
1685 if (!XFS_BUF_ISPINNED(bp
) && !xfs_buf_cond_lock(bp
)) {
1687 time_before(jiffies
, bp
->b_queuetime
+ age
)) {
1692 bp
->b_flags
&= ~(XBF_DELWRI
|_XBF_DELWRI_Q
|
1694 bp
->b_flags
|= XBF_WRITE
;
1695 list_move_tail(&bp
->b_list
, list
);
1696 trace_xfs_buf_delwri_split(bp
, _RET_IP_
);
1707 * Compare function is more complex than it needs to be because
1708 * the return value is only 32 bits and we are doing comparisons
1714 struct list_head
*a
,
1715 struct list_head
*b
)
1717 struct xfs_buf
*ap
= container_of(a
, struct xfs_buf
, b_list
);
1718 struct xfs_buf
*bp
= container_of(b
, struct xfs_buf
, b_list
);
1721 diff
= ap
->b_bn
- bp
->b_bn
;
1730 xfs_buf_delwri_sort(
1731 xfs_buftarg_t
*target
,
1732 struct list_head
*list
)
1734 list_sort(NULL
, list
, xfs_buf_cmp
);
1741 xfs_buftarg_t
*target
= (xfs_buftarg_t
*)data
;
1743 current
->flags
|= PF_MEMALLOC
;
1748 long age
= xfs_buf_age_centisecs
* msecs_to_jiffies(10);
1749 long tout
= xfs_buf_timer_centisecs
* msecs_to_jiffies(10);
1751 struct list_head tmp
;
1753 if (unlikely(freezing(current
))) {
1754 set_bit(XBT_FORCE_SLEEP
, &target
->bt_flags
);
1757 clear_bit(XBT_FORCE_SLEEP
, &target
->bt_flags
);
1760 /* sleep for a long time if there is nothing to do. */
1761 if (list_empty(&target
->bt_delwrite_queue
))
1762 tout
= MAX_SCHEDULE_TIMEOUT
;
1763 schedule_timeout_interruptible(tout
);
1765 xfs_buf_delwri_split(target
, &tmp
, age
);
1766 list_sort(NULL
, &tmp
, xfs_buf_cmp
);
1767 while (!list_empty(&tmp
)) {
1769 bp
= list_first_entry(&tmp
, struct xfs_buf
, b_list
);
1770 list_del_init(&bp
->b_list
);
1775 blk_flush_plug(current
);
1777 } while (!kthread_should_stop());
1783 * Go through all incore buffers, and release buffers if they belong to
1784 * the given device. This is used in filesystem error handling to
1785 * preserve the consistency of its metadata.
1789 xfs_buftarg_t
*target
,
1794 LIST_HEAD(tmp_list
);
1795 LIST_HEAD(wait_list
);
1797 xfs_buf_runall_queues(xfsconvertd_workqueue
);
1798 xfs_buf_runall_queues(xfsdatad_workqueue
);
1799 xfs_buf_runall_queues(xfslogd_workqueue
);
1801 set_bit(XBT_FORCE_FLUSH
, &target
->bt_flags
);
1802 pincount
= xfs_buf_delwri_split(target
, &tmp_list
, 0);
1805 * Dropped the delayed write list lock, now walk the temporary list.
1806 * All I/O is issued async and then if we need to wait for completion
1807 * we do that after issuing all the IO.
1809 list_sort(NULL
, &tmp_list
, xfs_buf_cmp
);
1810 while (!list_empty(&tmp_list
)) {
1811 bp
= list_first_entry(&tmp_list
, struct xfs_buf
, b_list
);
1812 ASSERT(target
== bp
->b_target
);
1813 list_del_init(&bp
->b_list
);
1815 bp
->b_flags
&= ~XBF_ASYNC
;
1816 list_add(&bp
->b_list
, &wait_list
);
1822 /* Expedite and wait for IO to complete. */
1823 blk_flush_plug(current
);
1824 while (!list_empty(&wait_list
)) {
1825 bp
= list_first_entry(&wait_list
, struct xfs_buf
, b_list
);
1827 list_del_init(&bp
->b_list
);
1839 xfs_buf_zone
= kmem_zone_init_flags(sizeof(xfs_buf_t
), "xfs_buf",
1840 KM_ZONE_HWALIGN
, NULL
);
1844 xfslogd_workqueue
= alloc_workqueue("xfslogd",
1845 WQ_MEM_RECLAIM
| WQ_HIGHPRI
, 1);
1846 if (!xfslogd_workqueue
)
1847 goto out_free_buf_zone
;
1849 xfsdatad_workqueue
= alloc_workqueue("xfsdatad", WQ_MEM_RECLAIM
, 1);
1850 if (!xfsdatad_workqueue
)
1851 goto out_destroy_xfslogd_workqueue
;
1853 xfsconvertd_workqueue
= alloc_workqueue("xfsconvertd",
1855 if (!xfsconvertd_workqueue
)
1856 goto out_destroy_xfsdatad_workqueue
;
1860 out_destroy_xfsdatad_workqueue
:
1861 destroy_workqueue(xfsdatad_workqueue
);
1862 out_destroy_xfslogd_workqueue
:
1863 destroy_workqueue(xfslogd_workqueue
);
1865 kmem_zone_destroy(xfs_buf_zone
);
1871 xfs_buf_terminate(void)
1873 destroy_workqueue(xfsconvertd_workqueue
);
1874 destroy_workqueue(xfsdatad_workqueue
);
1875 destroy_workqueue(xfslogd_workqueue
);
1876 kmem_zone_destroy(xfs_buf_zone
);
1879 #ifdef CONFIG_KDB_MODULES
1881 xfs_get_buftarg_list(void)
1883 return &xfs_buftarg_list
;