2 * bitmap.c two-level bitmap (C) Peter T. Breuer (ptb@ot.uc3m.es) 2003
4 * bitmap_create - sets up the bitmap structure
5 * bitmap_destroy - destroys the bitmap structure
7 * additions, Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.:
8 * - added disk storage for bitmap
9 * - changes to allow various bitmap chunk sizes
15 * flush after percent set rather than just time based. (maybe both).
18 #include <linux/blkdev.h>
19 #include <linux/module.h>
20 #include <linux/errno.h>
21 #include <linux/slab.h>
22 #include <linux/init.h>
23 #include <linux/timer.h>
24 #include <linux/sched.h>
25 #include <linux/list.h>
26 #include <linux/file.h>
27 #include <linux/mount.h>
28 #include <linux/buffer_head.h>
29 #include <linux/seq_file.h>
33 static inline char *bmname(struct bitmap
*bitmap
)
35 return bitmap
->mddev
? mdname(bitmap
->mddev
) : "mdX";
39 * check a page and, if necessary, allocate it (or hijack it if the alloc fails)
41 * 1) check to see if this page is allocated, if it's not then try to alloc
42 * 2) if the alloc fails, set the page's hijacked flag so we'll use the
43 * page pointer directly as a counter
45 * if we find our page, we increment the page's refcount so that it stays
46 * allocated while we're using it
48 static int bitmap_checkpage(struct bitmap_counts
*bitmap
,
49 unsigned long page
, int create
)
50 __releases(bitmap
->lock
)
51 __acquires(bitmap
->lock
)
53 unsigned char *mappage
;
55 if (page
>= bitmap
->pages
) {
56 /* This can happen if bitmap_start_sync goes beyond
57 * End-of-device while looking for a whole page.
63 if (bitmap
->bp
[page
].hijacked
) /* it's hijacked, don't try to alloc */
66 if (bitmap
->bp
[page
].map
) /* page is already allocated, just return */
72 /* this page has not been allocated yet */
74 spin_unlock_irq(&bitmap
->lock
);
75 /* It is possible that this is being called inside a
76 * prepare_to_wait/finish_wait loop from raid5c:make_request().
77 * In general it is not permitted to sleep in that context as it
78 * can cause the loop to spin freely.
79 * That doesn't apply here as we can only reach this point
81 * When this function completes, either bp[page].map or
82 * bp[page].hijacked. In either case, this function will
83 * abort before getting to this point again. So there is
84 * no risk of a free-spin, and so it is safe to assert
85 * that sleeping here is allowed.
87 sched_annotate_sleep();
88 mappage
= kzalloc(PAGE_SIZE
, GFP_NOIO
);
89 spin_lock_irq(&bitmap
->lock
);
91 if (mappage
== NULL
) {
92 pr_debug("md/bitmap: map page allocation failed, hijacking\n");
93 /* failed - set the hijacked flag so that we can use the
94 * pointer as a counter */
95 if (!bitmap
->bp
[page
].map
)
96 bitmap
->bp
[page
].hijacked
= 1;
97 } else if (bitmap
->bp
[page
].map
||
98 bitmap
->bp
[page
].hijacked
) {
99 /* somebody beat us to getting the page */
104 /* no page was in place and we have one, so install it */
106 bitmap
->bp
[page
].map
= mappage
;
107 bitmap
->missing_pages
--;
112 /* if page is completely empty, put it back on the free list, or dealloc it */
113 /* if page was hijacked, unmark the flag so it might get alloced next time */
114 /* Note: lock should be held when calling this */
115 static void bitmap_checkfree(struct bitmap_counts
*bitmap
, unsigned long page
)
119 if (bitmap
->bp
[page
].count
) /* page is still busy */
122 /* page is no longer in use, it can be released */
124 if (bitmap
->bp
[page
].hijacked
) { /* page was hijacked, undo this now */
125 bitmap
->bp
[page
].hijacked
= 0;
126 bitmap
->bp
[page
].map
= NULL
;
128 /* normal case, free the page */
129 ptr
= bitmap
->bp
[page
].map
;
130 bitmap
->bp
[page
].map
= NULL
;
131 bitmap
->missing_pages
++;
137 * bitmap file handling - read and write the bitmap file and its superblock
141 * basic page I/O operations
144 /* IO operations when bitmap is stored near all superblocks */
145 static int read_sb_page(struct mddev
*mddev
, loff_t offset
,
147 unsigned long index
, int size
)
149 /* choose a good rdev and read the page from there */
151 struct md_rdev
*rdev
;
154 rdev_for_each(rdev
, mddev
) {
155 if (! test_bit(In_sync
, &rdev
->flags
)
156 || test_bit(Faulty
, &rdev
->flags
))
159 target
= offset
+ index
* (PAGE_SIZE
/512);
161 if (sync_page_io(rdev
, target
,
162 roundup(size
, bdev_logical_block_size(rdev
->bdev
)),
171 static struct md_rdev
*next_active_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
173 /* Iterate the disks of an mddev, using rcu to protect access to the
174 * linked list, and raising the refcount of devices we return to ensure
175 * they don't disappear while in use.
176 * As devices are only added or removed when raid_disk is < 0 and
177 * nr_pending is 0 and In_sync is clear, the entries we return will
178 * still be in the same position on the list when we re-enter
179 * list_for_each_entry_continue_rcu.
183 /* start at the beginning */
184 rdev
= list_entry_rcu(&mddev
->disks
, struct md_rdev
, same_set
);
186 /* release the previous rdev and start from there. */
187 rdev_dec_pending(rdev
, mddev
);
189 list_for_each_entry_continue_rcu(rdev
, &mddev
->disks
, same_set
) {
190 if (rdev
->raid_disk
>= 0 &&
191 !test_bit(Faulty
, &rdev
->flags
)) {
192 /* this is a usable devices */
193 atomic_inc(&rdev
->nr_pending
);
202 static int write_sb_page(struct bitmap
*bitmap
, struct page
*page
, int wait
)
204 struct md_rdev
*rdev
= NULL
;
205 struct block_device
*bdev
;
206 struct mddev
*mddev
= bitmap
->mddev
;
207 struct bitmap_storage
*store
= &bitmap
->storage
;
210 if (mddev_is_clustered(bitmap
->mddev
))
211 node_offset
= bitmap
->cluster_slot
* store
->file_pages
;
213 while ((rdev
= next_active_rdev(rdev
, mddev
)) != NULL
) {
214 int size
= PAGE_SIZE
;
215 loff_t offset
= mddev
->bitmap_info
.offset
;
217 bdev
= (rdev
->meta_bdev
) ? rdev
->meta_bdev
: rdev
->bdev
;
219 if (page
->index
== store
->file_pages
-1) {
220 int last_page_size
= store
->bytes
& (PAGE_SIZE
-1);
221 if (last_page_size
== 0)
222 last_page_size
= PAGE_SIZE
;
223 size
= roundup(last_page_size
,
224 bdev_logical_block_size(bdev
));
226 /* Just make sure we aren't corrupting data or
229 if (mddev
->external
) {
230 /* Bitmap could be anywhere. */
231 if (rdev
->sb_start
+ offset
+ (page
->index
235 rdev
->sb_start
+ offset
236 < (rdev
->data_offset
+ mddev
->dev_sectors
239 } else if (offset
< 0) {
240 /* DATA BITMAP METADATA */
242 + (long)(page
->index
* (PAGE_SIZE
/512))
244 /* bitmap runs in to metadata */
246 if (rdev
->data_offset
+ mddev
->dev_sectors
247 > rdev
->sb_start
+ offset
)
248 /* data runs in to bitmap */
250 } else if (rdev
->sb_start
< rdev
->data_offset
) {
251 /* METADATA BITMAP DATA */
254 + page
->index
*(PAGE_SIZE
/512) + size
/512
256 /* bitmap runs in to data */
259 /* DATA METADATA BITMAP - no problems */
261 md_super_write(mddev
, rdev
,
262 rdev
->sb_start
+ offset
263 + page
->index
* (PAGE_SIZE
/512),
269 md_super_wait(mddev
);
276 static void bitmap_file_kick(struct bitmap
*bitmap
);
278 * write out a page to a file
280 static void write_page(struct bitmap
*bitmap
, struct page
*page
, int wait
)
282 struct buffer_head
*bh
;
284 if (bitmap
->storage
.file
== NULL
) {
285 switch (write_sb_page(bitmap
, page
, wait
)) {
287 set_bit(BITMAP_WRITE_ERROR
, &bitmap
->flags
);
291 bh
= page_buffers(page
);
293 while (bh
&& bh
->b_blocknr
) {
294 atomic_inc(&bitmap
->pending_writes
);
295 set_buffer_locked(bh
);
296 set_buffer_mapped(bh
);
297 submit_bh(WRITE
| REQ_SYNC
, bh
);
298 bh
= bh
->b_this_page
;
302 wait_event(bitmap
->write_wait
,
303 atomic_read(&bitmap
->pending_writes
)==0);
305 if (test_bit(BITMAP_WRITE_ERROR
, &bitmap
->flags
))
306 bitmap_file_kick(bitmap
);
309 static void end_bitmap_write(struct buffer_head
*bh
, int uptodate
)
311 struct bitmap
*bitmap
= bh
->b_private
;
314 set_bit(BITMAP_WRITE_ERROR
, &bitmap
->flags
);
315 if (atomic_dec_and_test(&bitmap
->pending_writes
))
316 wake_up(&bitmap
->write_wait
);
319 /* copied from buffer.c */
321 __clear_page_buffers(struct page
*page
)
323 ClearPagePrivate(page
);
324 set_page_private(page
, 0);
325 page_cache_release(page
);
327 static void free_buffers(struct page
*page
)
329 struct buffer_head
*bh
;
331 if (!PagePrivate(page
))
334 bh
= page_buffers(page
);
336 struct buffer_head
*next
= bh
->b_this_page
;
337 free_buffer_head(bh
);
340 __clear_page_buffers(page
);
344 /* read a page from a file.
345 * We both read the page, and attach buffers to the page to record the
346 * address of each block (using bmap). These addresses will be used
347 * to write the block later, completely bypassing the filesystem.
348 * This usage is similar to how swap files are handled, and allows us
349 * to write to a file with no concerns of memory allocation failing.
351 static int read_page(struct file
*file
, unsigned long index
,
352 struct bitmap
*bitmap
,
357 struct inode
*inode
= file_inode(file
);
358 struct buffer_head
*bh
;
361 pr_debug("read bitmap file (%dB @ %llu)\n", (int)PAGE_SIZE
,
362 (unsigned long long)index
<< PAGE_SHIFT
);
364 bh
= alloc_page_buffers(page
, 1<<inode
->i_blkbits
, 0);
369 attach_page_buffers(page
, bh
);
370 block
= index
<< (PAGE_SHIFT
- inode
->i_blkbits
);
375 bh
->b_blocknr
= bmap(inode
, block
);
376 if (bh
->b_blocknr
== 0) {
377 /* Cannot use this file! */
381 bh
->b_bdev
= inode
->i_sb
->s_bdev
;
382 if (count
< (1<<inode
->i_blkbits
))
385 count
-= (1<<inode
->i_blkbits
);
387 bh
->b_end_io
= end_bitmap_write
;
388 bh
->b_private
= bitmap
;
389 atomic_inc(&bitmap
->pending_writes
);
390 set_buffer_locked(bh
);
391 set_buffer_mapped(bh
);
395 bh
= bh
->b_this_page
;
399 wait_event(bitmap
->write_wait
,
400 atomic_read(&bitmap
->pending_writes
)==0);
401 if (test_bit(BITMAP_WRITE_ERROR
, &bitmap
->flags
))
405 printk(KERN_ALERT
"md: bitmap read error: (%dB @ %llu): %d\n",
407 (unsigned long long)index
<< PAGE_SHIFT
,
413 * bitmap file superblock operations
416 /* update the event counter and sync the superblock to disk */
417 void bitmap_update_sb(struct bitmap
*bitmap
)
421 if (!bitmap
|| !bitmap
->mddev
) /* no bitmap for this array */
423 if (bitmap
->mddev
->bitmap_info
.external
)
425 if (!bitmap
->storage
.sb_page
) /* no superblock */
427 sb
= kmap_atomic(bitmap
->storage
.sb_page
);
428 sb
->events
= cpu_to_le64(bitmap
->mddev
->events
);
429 if (bitmap
->mddev
->events
< bitmap
->events_cleared
)
430 /* rocking back to read-only */
431 bitmap
->events_cleared
= bitmap
->mddev
->events
;
432 sb
->events_cleared
= cpu_to_le64(bitmap
->events_cleared
);
433 sb
->state
= cpu_to_le32(bitmap
->flags
);
434 /* Just in case these have been changed via sysfs: */
435 sb
->daemon_sleep
= cpu_to_le32(bitmap
->mddev
->bitmap_info
.daemon_sleep
/HZ
);
436 sb
->write_behind
= cpu_to_le32(bitmap
->mddev
->bitmap_info
.max_write_behind
);
437 /* This might have been changed by a reshape */
438 sb
->sync_size
= cpu_to_le64(bitmap
->mddev
->resync_max_sectors
);
439 sb
->chunksize
= cpu_to_le32(bitmap
->mddev
->bitmap_info
.chunksize
);
440 sb
->nodes
= cpu_to_le32(bitmap
->mddev
->bitmap_info
.nodes
);
441 sb
->sectors_reserved
= cpu_to_le32(bitmap
->mddev
->
444 write_page(bitmap
, bitmap
->storage
.sb_page
, 1);
447 /* print out the bitmap file superblock */
448 void bitmap_print_sb(struct bitmap
*bitmap
)
452 if (!bitmap
|| !bitmap
->storage
.sb_page
)
454 sb
= kmap_atomic(bitmap
->storage
.sb_page
);
455 printk(KERN_DEBUG
"%s: bitmap file superblock:\n", bmname(bitmap
));
456 printk(KERN_DEBUG
" magic: %08x\n", le32_to_cpu(sb
->magic
));
457 printk(KERN_DEBUG
" version: %d\n", le32_to_cpu(sb
->version
));
458 printk(KERN_DEBUG
" uuid: %08x.%08x.%08x.%08x\n",
459 *(__u32
*)(sb
->uuid
+0),
460 *(__u32
*)(sb
->uuid
+4),
461 *(__u32
*)(sb
->uuid
+8),
462 *(__u32
*)(sb
->uuid
+12));
463 printk(KERN_DEBUG
" events: %llu\n",
464 (unsigned long long) le64_to_cpu(sb
->events
));
465 printk(KERN_DEBUG
"events cleared: %llu\n",
466 (unsigned long long) le64_to_cpu(sb
->events_cleared
));
467 printk(KERN_DEBUG
" state: %08x\n", le32_to_cpu(sb
->state
));
468 printk(KERN_DEBUG
" chunksize: %d B\n", le32_to_cpu(sb
->chunksize
));
469 printk(KERN_DEBUG
" daemon sleep: %ds\n", le32_to_cpu(sb
->daemon_sleep
));
470 printk(KERN_DEBUG
" sync size: %llu KB\n",
471 (unsigned long long)le64_to_cpu(sb
->sync_size
)/2);
472 printk(KERN_DEBUG
"max write behind: %d\n", le32_to_cpu(sb
->write_behind
));
480 * This function is somewhat the reverse of bitmap_read_sb. bitmap_read_sb
481 * reads and verifies the on-disk bitmap superblock and populates bitmap_info.
482 * This function verifies 'bitmap_info' and populates the on-disk bitmap
483 * structure, which is to be written to disk.
485 * Returns: 0 on success, -Exxx on error
487 static int bitmap_new_disk_sb(struct bitmap
*bitmap
)
490 unsigned long chunksize
, daemon_sleep
, write_behind
;
492 bitmap
->storage
.sb_page
= alloc_page(GFP_KERNEL
);
493 if (bitmap
->storage
.sb_page
== NULL
)
495 bitmap
->storage
.sb_page
->index
= 0;
497 sb
= kmap_atomic(bitmap
->storage
.sb_page
);
499 sb
->magic
= cpu_to_le32(BITMAP_MAGIC
);
500 sb
->version
= cpu_to_le32(BITMAP_MAJOR_HI
);
502 chunksize
= bitmap
->mddev
->bitmap_info
.chunksize
;
504 if (!is_power_of_2(chunksize
)) {
506 printk(KERN_ERR
"bitmap chunksize not a power of 2\n");
509 sb
->chunksize
= cpu_to_le32(chunksize
);
511 daemon_sleep
= bitmap
->mddev
->bitmap_info
.daemon_sleep
;
513 (daemon_sleep
< 1) || (daemon_sleep
> MAX_SCHEDULE_TIMEOUT
)) {
514 printk(KERN_INFO
"Choosing daemon_sleep default (5 sec)\n");
515 daemon_sleep
= 5 * HZ
;
517 sb
->daemon_sleep
= cpu_to_le32(daemon_sleep
);
518 bitmap
->mddev
->bitmap_info
.daemon_sleep
= daemon_sleep
;
521 * FIXME: write_behind for RAID1. If not specified, what
522 * is a good choice? We choose COUNTER_MAX / 2 arbitrarily.
524 write_behind
= bitmap
->mddev
->bitmap_info
.max_write_behind
;
525 if (write_behind
> COUNTER_MAX
)
526 write_behind
= COUNTER_MAX
/ 2;
527 sb
->write_behind
= cpu_to_le32(write_behind
);
528 bitmap
->mddev
->bitmap_info
.max_write_behind
= write_behind
;
530 /* keep the array size field of the bitmap superblock up to date */
531 sb
->sync_size
= cpu_to_le64(bitmap
->mddev
->resync_max_sectors
);
533 memcpy(sb
->uuid
, bitmap
->mddev
->uuid
, 16);
535 set_bit(BITMAP_STALE
, &bitmap
->flags
);
536 sb
->state
= cpu_to_le32(bitmap
->flags
);
537 bitmap
->events_cleared
= bitmap
->mddev
->events
;
538 sb
->events_cleared
= cpu_to_le64(bitmap
->mddev
->events
);
545 /* read the superblock from the bitmap file and initialize some bitmap fields */
546 static int bitmap_read_sb(struct bitmap
*bitmap
)
550 unsigned long chunksize
, daemon_sleep
, write_behind
;
551 unsigned long long events
;
553 unsigned long sectors_reserved
= 0;
555 struct page
*sb_page
;
556 int cluster_setup_done
= 0;
558 if (!bitmap
->storage
.file
&& !bitmap
->mddev
->bitmap_info
.offset
) {
559 chunksize
= 128 * 1024 * 1024;
560 daemon_sleep
= 5 * HZ
;
562 set_bit(BITMAP_STALE
, &bitmap
->flags
);
566 /* page 0 is the superblock, read it... */
567 sb_page
= alloc_page(GFP_KERNEL
);
570 bitmap
->storage
.sb_page
= sb_page
;
573 if (bitmap
->storage
.file
) {
574 loff_t isize
= i_size_read(bitmap
->storage
.file
->f_mapping
->host
);
575 int bytes
= isize
> PAGE_SIZE
? PAGE_SIZE
: isize
;
577 err
= read_page(bitmap
->storage
.file
, 0,
578 bitmap
, bytes
, sb_page
);
580 err
= read_sb_page(bitmap
->mddev
,
581 bitmap
->mddev
->bitmap_info
.offset
,
583 0, sizeof(bitmap_super_t
));
589 sb
= kmap_atomic(sb_page
);
591 chunksize
= le32_to_cpu(sb
->chunksize
);
592 daemon_sleep
= le32_to_cpu(sb
->daemon_sleep
) * HZ
;
593 write_behind
= le32_to_cpu(sb
->write_behind
);
594 sectors_reserved
= le32_to_cpu(sb
->sectors_reserved
);
595 nodes
= le32_to_cpu(sb
->nodes
);
596 strlcpy(bitmap
->mddev
->bitmap_info
.cluster_name
, sb
->cluster_name
, 64);
598 /* verify that the bitmap-specific fields are valid */
599 if (sb
->magic
!= cpu_to_le32(BITMAP_MAGIC
))
600 reason
= "bad magic";
601 else if (le32_to_cpu(sb
->version
) < BITMAP_MAJOR_LO
||
602 le32_to_cpu(sb
->version
) > BITMAP_MAJOR_HI
)
603 reason
= "unrecognized superblock version";
604 else if (chunksize
< 512)
605 reason
= "bitmap chunksize too small";
606 else if (!is_power_of_2(chunksize
))
607 reason
= "bitmap chunksize not a power of 2";
608 else if (daemon_sleep
< 1 || daemon_sleep
> MAX_SCHEDULE_TIMEOUT
)
609 reason
= "daemon sleep period out of range";
610 else if (write_behind
> COUNTER_MAX
)
611 reason
= "write-behind limit out of range (0 - 16383)";
613 printk(KERN_INFO
"%s: invalid bitmap file superblock: %s\n",
614 bmname(bitmap
), reason
);
618 /* keep the array size field of the bitmap superblock up to date */
619 sb
->sync_size
= cpu_to_le64(bitmap
->mddev
->resync_max_sectors
);
621 if (bitmap
->mddev
->persistent
) {
623 * We have a persistent array superblock, so compare the
624 * bitmap's UUID and event counter to the mddev's
626 if (memcmp(sb
->uuid
, bitmap
->mddev
->uuid
, 16)) {
628 "%s: bitmap superblock UUID mismatch\n",
632 events
= le64_to_cpu(sb
->events
);
633 if (!nodes
&& (events
< bitmap
->mddev
->events
)) {
635 "%s: bitmap file is out of date (%llu < %llu) "
636 "-- forcing full recovery\n",
637 bmname(bitmap
), events
,
638 (unsigned long long) bitmap
->mddev
->events
);
639 set_bit(BITMAP_STALE
, &bitmap
->flags
);
643 /* assign fields using values from superblock */
644 bitmap
->flags
|= le32_to_cpu(sb
->state
);
645 if (le32_to_cpu(sb
->version
) == BITMAP_MAJOR_HOSTENDIAN
)
646 set_bit(BITMAP_HOSTENDIAN
, &bitmap
->flags
);
647 bitmap
->events_cleared
= le64_to_cpu(sb
->events_cleared
);
648 strlcpy(bitmap
->mddev
->bitmap_info
.cluster_name
, sb
->cluster_name
, 64);
653 if (nodes
&& !cluster_setup_done
) {
656 bm_blocks
= sector_div(bitmap
->mddev
->resync_max_sectors
, (chunksize
>> 9));
657 bm_blocks
= bm_blocks
<< 3;
658 /* We have bitmap supers at 4k boundaries, hence this
660 bm_blocks
= DIV_ROUND_UP(bm_blocks
, 4096);
661 err
= md_setup_cluster(bitmap
->mddev
, nodes
);
663 pr_err("%s: Could not setup cluster service (%d)\n",
664 bmname(bitmap
), err
);
667 bitmap
->cluster_slot
= md_cluster_ops
->slot_number(bitmap
->mddev
);
668 bitmap
->mddev
->bitmap_info
.offset
+=
669 bitmap
->cluster_slot
* (bm_blocks
<< 3);
670 pr_info("%s:%d bm slot: %d offset: %llu\n", __func__
, __LINE__
,
671 bitmap
->cluster_slot
,
672 (unsigned long long)bitmap
->mddev
->bitmap_info
.offset
);
673 cluster_setup_done
= 1;
679 if (test_bit(BITMAP_STALE
, &bitmap
->flags
))
680 bitmap
->events_cleared
= bitmap
->mddev
->events
;
681 bitmap
->mddev
->bitmap_info
.chunksize
= chunksize
;
682 bitmap
->mddev
->bitmap_info
.daemon_sleep
= daemon_sleep
;
683 bitmap
->mddev
->bitmap_info
.max_write_behind
= write_behind
;
684 bitmap
->mddev
->bitmap_info
.nodes
= nodes
;
685 if (bitmap
->mddev
->bitmap_info
.space
== 0 ||
686 bitmap
->mddev
->bitmap_info
.space
> sectors_reserved
)
687 bitmap
->mddev
->bitmap_info
.space
= sectors_reserved
;
689 bitmap_print_sb(bitmap
);
690 if (cluster_setup_done
)
691 md_cluster_stop(bitmap
->mddev
);
697 * general bitmap file operations
703 * Use one bit per "chunk" (block set). We do the disk I/O on the bitmap
704 * file a page at a time. There's a superblock at the start of the file.
706 /* calculate the index of the page that contains this bit */
707 static inline unsigned long file_page_index(struct bitmap_storage
*store
,
711 chunk
+= sizeof(bitmap_super_t
) << 3;
712 return chunk
>> PAGE_BIT_SHIFT
;
715 /* calculate the (bit) offset of this bit within a page */
716 static inline unsigned long file_page_offset(struct bitmap_storage
*store
,
720 chunk
+= sizeof(bitmap_super_t
) << 3;
721 return chunk
& (PAGE_BITS
- 1);
725 * return a pointer to the page in the filemap that contains the given bit
728 static inline struct page
*filemap_get_page(struct bitmap_storage
*store
,
731 if (file_page_index(store
, chunk
) >= store
->file_pages
)
733 return store
->filemap
[file_page_index(store
, chunk
)];
736 static int bitmap_storage_alloc(struct bitmap_storage
*store
,
737 unsigned long chunks
, int with_super
,
740 int pnum
, offset
= 0;
741 unsigned long num_pages
;
744 bytes
= DIV_ROUND_UP(chunks
, 8);
746 bytes
+= sizeof(bitmap_super_t
);
748 num_pages
= DIV_ROUND_UP(bytes
, PAGE_SIZE
);
749 offset
= slot_number
* (num_pages
- 1);
751 store
->filemap
= kmalloc(sizeof(struct page
*)
752 * num_pages
, GFP_KERNEL
);
756 if (with_super
&& !store
->sb_page
) {
757 store
->sb_page
= alloc_page(GFP_KERNEL
|__GFP_ZERO
);
758 if (store
->sb_page
== NULL
)
763 if (store
->sb_page
) {
764 store
->filemap
[0] = store
->sb_page
;
766 store
->sb_page
->index
= offset
;
769 for ( ; pnum
< num_pages
; pnum
++) {
770 store
->filemap
[pnum
] = alloc_page(GFP_KERNEL
|__GFP_ZERO
);
771 if (!store
->filemap
[pnum
]) {
772 store
->file_pages
= pnum
;
775 store
->filemap
[pnum
]->index
= pnum
+ offset
;
777 store
->file_pages
= pnum
;
779 /* We need 4 bits per page, rounded up to a multiple
780 * of sizeof(unsigned long) */
781 store
->filemap_attr
= kzalloc(
782 roundup(DIV_ROUND_UP(num_pages
*4, 8), sizeof(unsigned long)),
784 if (!store
->filemap_attr
)
787 store
->bytes
= bytes
;
792 static void bitmap_file_unmap(struct bitmap_storage
*store
)
794 struct page
**map
, *sb_page
;
799 map
= store
->filemap
;
800 pages
= store
->file_pages
;
801 sb_page
= store
->sb_page
;
804 if (map
[pages
] != sb_page
) /* 0 is sb_page, release it below */
805 free_buffers(map
[pages
]);
807 kfree(store
->filemap_attr
);
810 free_buffers(sb_page
);
813 struct inode
*inode
= file_inode(file
);
814 invalidate_mapping_pages(inode
->i_mapping
, 0, -1);
820 * bitmap_file_kick - if an error occurs while manipulating the bitmap file
821 * then it is no longer reliable, so we stop using it and we mark the file
822 * as failed in the superblock
824 static void bitmap_file_kick(struct bitmap
*bitmap
)
826 char *path
, *ptr
= NULL
;
828 if (!test_and_set_bit(BITMAP_STALE
, &bitmap
->flags
)) {
829 bitmap_update_sb(bitmap
);
831 if (bitmap
->storage
.file
) {
832 path
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
834 ptr
= d_path(&bitmap
->storage
.file
->f_path
,
838 "%s: kicking failed bitmap file %s from array!\n",
839 bmname(bitmap
), IS_ERR(ptr
) ? "" : ptr
);
844 "%s: disabling internal bitmap due to errors\n",
849 enum bitmap_page_attr
{
850 BITMAP_PAGE_DIRTY
= 0, /* there are set bits that need to be synced */
851 BITMAP_PAGE_PENDING
= 1, /* there are bits that are being cleaned.
852 * i.e. counter is 1 or 2. */
853 BITMAP_PAGE_NEEDWRITE
= 2, /* there are cleared bits that need to be synced */
856 static inline void set_page_attr(struct bitmap
*bitmap
, int pnum
,
857 enum bitmap_page_attr attr
)
859 set_bit((pnum
<<2) + attr
, bitmap
->storage
.filemap_attr
);
862 static inline void clear_page_attr(struct bitmap
*bitmap
, int pnum
,
863 enum bitmap_page_attr attr
)
865 clear_bit((pnum
<<2) + attr
, bitmap
->storage
.filemap_attr
);
868 static inline int test_page_attr(struct bitmap
*bitmap
, int pnum
,
869 enum bitmap_page_attr attr
)
871 return test_bit((pnum
<<2) + attr
, bitmap
->storage
.filemap_attr
);
874 static inline int test_and_clear_page_attr(struct bitmap
*bitmap
, int pnum
,
875 enum bitmap_page_attr attr
)
877 return test_and_clear_bit((pnum
<<2) + attr
,
878 bitmap
->storage
.filemap_attr
);
881 * bitmap_file_set_bit -- called before performing a write to the md device
882 * to set (and eventually sync) a particular bit in the bitmap file
884 * we set the bit immediately, then we record the page number so that
885 * when an unplug occurs, we can flush the dirty pages out to disk
887 static void bitmap_file_set_bit(struct bitmap
*bitmap
, sector_t block
)
892 unsigned long chunk
= block
>> bitmap
->counts
.chunkshift
;
894 page
= filemap_get_page(&bitmap
->storage
, chunk
);
897 bit
= file_page_offset(&bitmap
->storage
, chunk
);
900 kaddr
= kmap_atomic(page
);
901 if (test_bit(BITMAP_HOSTENDIAN
, &bitmap
->flags
))
904 set_bit_le(bit
, kaddr
);
905 kunmap_atomic(kaddr
);
906 pr_debug("set file bit %lu page %lu\n", bit
, page
->index
);
907 /* record page number so it gets flushed to disk when unplug occurs */
908 set_page_attr(bitmap
, page
->index
, BITMAP_PAGE_DIRTY
);
911 static void bitmap_file_clear_bit(struct bitmap
*bitmap
, sector_t block
)
916 unsigned long chunk
= block
>> bitmap
->counts
.chunkshift
;
918 page
= filemap_get_page(&bitmap
->storage
, chunk
);
921 bit
= file_page_offset(&bitmap
->storage
, chunk
);
922 paddr
= kmap_atomic(page
);
923 if (test_bit(BITMAP_HOSTENDIAN
, &bitmap
->flags
))
924 clear_bit(bit
, paddr
);
926 clear_bit_le(bit
, paddr
);
927 kunmap_atomic(paddr
);
928 if (!test_page_attr(bitmap
, page
->index
, BITMAP_PAGE_NEEDWRITE
)) {
929 set_page_attr(bitmap
, page
->index
, BITMAP_PAGE_PENDING
);
930 bitmap
->allclean
= 0;
934 /* this gets called when the md device is ready to unplug its underlying
935 * (slave) device queues -- before we let any writes go down, we need to
936 * sync the dirty pages of the bitmap file to disk */
937 void bitmap_unplug(struct bitmap
*bitmap
)
940 int dirty
, need_write
;
942 if (!bitmap
|| !bitmap
->storage
.filemap
||
943 test_bit(BITMAP_STALE
, &bitmap
->flags
))
946 /* look at each page to see if there are any set bits that need to be
947 * flushed out to disk */
948 for (i
= 0; i
< bitmap
->storage
.file_pages
; i
++) {
949 if (!bitmap
->storage
.filemap
)
951 dirty
= test_and_clear_page_attr(bitmap
, i
, BITMAP_PAGE_DIRTY
);
952 need_write
= test_and_clear_page_attr(bitmap
, i
,
953 BITMAP_PAGE_NEEDWRITE
);
954 if (dirty
|| need_write
) {
955 clear_page_attr(bitmap
, i
, BITMAP_PAGE_PENDING
);
956 write_page(bitmap
, bitmap
->storage
.filemap
[i
], 0);
959 if (bitmap
->storage
.file
)
960 wait_event(bitmap
->write_wait
,
961 atomic_read(&bitmap
->pending_writes
)==0);
963 md_super_wait(bitmap
->mddev
);
965 if (test_bit(BITMAP_WRITE_ERROR
, &bitmap
->flags
))
966 bitmap_file_kick(bitmap
);
968 EXPORT_SYMBOL(bitmap_unplug
);
970 static void bitmap_set_memory_bits(struct bitmap
*bitmap
, sector_t offset
, int needed
);
971 /* * bitmap_init_from_disk -- called at bitmap_create time to initialize
972 * the in-memory bitmap from the on-disk bitmap -- also, sets up the
973 * memory mapping of the bitmap file
975 * if there's no bitmap file, or if the bitmap file had been
976 * previously kicked from the array, we mark all the bits as
977 * 1's in order to cause a full resync.
979 * We ignore all bits for sectors that end earlier than 'start'.
980 * This is used when reading an out-of-date bitmap...
982 static int bitmap_init_from_disk(struct bitmap
*bitmap
, sector_t start
)
984 unsigned long i
, chunks
, index
, oldindex
, bit
, node_offset
= 0;
985 struct page
*page
= NULL
;
986 unsigned long bit_cnt
= 0;
988 unsigned long offset
;
992 struct bitmap_storage
*store
= &bitmap
->storage
;
994 chunks
= bitmap
->counts
.chunks
;
997 if (!file
&& !bitmap
->mddev
->bitmap_info
.offset
) {
998 /* No permanent bitmap - fill with '1s'. */
999 store
->filemap
= NULL
;
1000 store
->file_pages
= 0;
1001 for (i
= 0; i
< chunks
; i
++) {
1002 /* if the disk bit is set, set the memory bit */
1003 int needed
= ((sector_t
)(i
+1) << (bitmap
->counts
.chunkshift
)
1005 bitmap_set_memory_bits(bitmap
,
1006 (sector_t
)i
<< bitmap
->counts
.chunkshift
,
1012 outofdate
= test_bit(BITMAP_STALE
, &bitmap
->flags
);
1014 printk(KERN_INFO
"%s: bitmap file is out of date, doing full "
1015 "recovery\n", bmname(bitmap
));
1017 if (file
&& i_size_read(file
->f_mapping
->host
) < store
->bytes
) {
1018 printk(KERN_INFO
"%s: bitmap file too short %lu < %lu\n",
1020 (unsigned long) i_size_read(file
->f_mapping
->host
),
1027 if (!bitmap
->mddev
->bitmap_info
.external
)
1028 offset
= sizeof(bitmap_super_t
);
1030 if (mddev_is_clustered(bitmap
->mddev
))
1031 node_offset
= bitmap
->cluster_slot
* (DIV_ROUND_UP(store
->bytes
, PAGE_SIZE
));
1033 for (i
= 0; i
< chunks
; i
++) {
1035 index
= file_page_index(&bitmap
->storage
, i
);
1036 bit
= file_page_offset(&bitmap
->storage
, i
);
1037 if (index
!= oldindex
) { /* this is a new page, read it in */
1039 /* unmap the old page, we're done with it */
1040 if (index
== store
->file_pages
-1)
1041 count
= store
->bytes
- index
* PAGE_SIZE
;
1044 page
= store
->filemap
[index
];
1046 ret
= read_page(file
, index
, bitmap
,
1051 bitmap
->mddev
->bitmap_info
.offset
,
1053 index
+ node_offset
, count
);
1062 * if bitmap is out of date, dirty the
1063 * whole page and write it out
1065 paddr
= kmap_atomic(page
);
1066 memset(paddr
+ offset
, 0xff,
1067 PAGE_SIZE
- offset
);
1068 kunmap_atomic(paddr
);
1069 write_page(bitmap
, page
, 1);
1072 if (test_bit(BITMAP_WRITE_ERROR
,
1077 paddr
= kmap_atomic(page
);
1078 if (test_bit(BITMAP_HOSTENDIAN
, &bitmap
->flags
))
1079 b
= test_bit(bit
, paddr
);
1081 b
= test_bit_le(bit
, paddr
);
1082 kunmap_atomic(paddr
);
1084 /* if the disk bit is set, set the memory bit */
1085 int needed
= ((sector_t
)(i
+1) << bitmap
->counts
.chunkshift
1087 bitmap_set_memory_bits(bitmap
,
1088 (sector_t
)i
<< bitmap
->counts
.chunkshift
,
1095 printk(KERN_INFO
"%s: bitmap initialized from disk: "
1096 "read %lu pages, set %lu of %lu bits\n",
1097 bmname(bitmap
), store
->file_pages
,
1103 printk(KERN_INFO
"%s: bitmap initialisation failed: %d\n",
1104 bmname(bitmap
), ret
);
1108 void bitmap_write_all(struct bitmap
*bitmap
)
1110 /* We don't actually write all bitmap blocks here,
1111 * just flag them as needing to be written
1115 if (!bitmap
|| !bitmap
->storage
.filemap
)
1117 if (bitmap
->storage
.file
)
1118 /* Only one copy, so nothing needed */
1121 for (i
= 0; i
< bitmap
->storage
.file_pages
; i
++)
1122 set_page_attr(bitmap
, i
,
1123 BITMAP_PAGE_NEEDWRITE
);
1124 bitmap
->allclean
= 0;
1127 static void bitmap_count_page(struct bitmap_counts
*bitmap
,
1128 sector_t offset
, int inc
)
1130 sector_t chunk
= offset
>> bitmap
->chunkshift
;
1131 unsigned long page
= chunk
>> PAGE_COUNTER_SHIFT
;
1132 bitmap
->bp
[page
].count
+= inc
;
1133 bitmap_checkfree(bitmap
, page
);
1136 static void bitmap_set_pending(struct bitmap_counts
*bitmap
, sector_t offset
)
1138 sector_t chunk
= offset
>> bitmap
->chunkshift
;
1139 unsigned long page
= chunk
>> PAGE_COUNTER_SHIFT
;
1140 struct bitmap_page
*bp
= &bitmap
->bp
[page
];
1146 static bitmap_counter_t
*bitmap_get_counter(struct bitmap_counts
*bitmap
,
1147 sector_t offset
, sector_t
*blocks
,
1151 * bitmap daemon -- periodically wakes up to clean bits and flush pages
1155 void bitmap_daemon_work(struct mddev
*mddev
)
1157 struct bitmap
*bitmap
;
1159 unsigned long nextpage
;
1161 struct bitmap_counts
*counts
;
1163 /* Use a mutex to guard daemon_work against
1166 mutex_lock(&mddev
->bitmap_info
.mutex
);
1167 bitmap
= mddev
->bitmap
;
1168 if (bitmap
== NULL
) {
1169 mutex_unlock(&mddev
->bitmap_info
.mutex
);
1172 if (time_before(jiffies
, bitmap
->daemon_lastrun
1173 + mddev
->bitmap_info
.daemon_sleep
))
1176 bitmap
->daemon_lastrun
= jiffies
;
1177 if (bitmap
->allclean
) {
1178 mddev
->thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
1181 bitmap
->allclean
= 1;
1183 /* Any file-page which is PENDING now needs to be written.
1184 * So set NEEDWRITE now, then after we make any last-minute changes
1187 for (j
= 0; j
< bitmap
->storage
.file_pages
; j
++)
1188 if (test_and_clear_page_attr(bitmap
, j
,
1189 BITMAP_PAGE_PENDING
))
1190 set_page_attr(bitmap
, j
,
1191 BITMAP_PAGE_NEEDWRITE
);
1193 if (bitmap
->need_sync
&&
1194 mddev
->bitmap_info
.external
== 0) {
1195 /* Arrange for superblock update as well as
1198 bitmap
->need_sync
= 0;
1199 if (bitmap
->storage
.filemap
) {
1200 sb
= kmap_atomic(bitmap
->storage
.sb_page
);
1201 sb
->events_cleared
=
1202 cpu_to_le64(bitmap
->events_cleared
);
1204 set_page_attr(bitmap
, 0,
1205 BITMAP_PAGE_NEEDWRITE
);
1208 /* Now look at the bitmap counters and if any are '2' or '1',
1209 * decrement and handle accordingly.
1211 counts
= &bitmap
->counts
;
1212 spin_lock_irq(&counts
->lock
);
1214 for (j
= 0; j
< counts
->chunks
; j
++) {
1215 bitmap_counter_t
*bmc
;
1216 sector_t block
= (sector_t
)j
<< counts
->chunkshift
;
1218 if (j
== nextpage
) {
1219 nextpage
+= PAGE_COUNTER_RATIO
;
1220 if (!counts
->bp
[j
>> PAGE_COUNTER_SHIFT
].pending
) {
1221 j
|= PAGE_COUNTER_MASK
;
1224 counts
->bp
[j
>> PAGE_COUNTER_SHIFT
].pending
= 0;
1226 bmc
= bitmap_get_counter(counts
,
1231 j
|= PAGE_COUNTER_MASK
;
1234 if (*bmc
== 1 && !bitmap
->need_sync
) {
1235 /* We can clear the bit */
1237 bitmap_count_page(counts
, block
, -1);
1238 bitmap_file_clear_bit(bitmap
, block
);
1239 } else if (*bmc
&& *bmc
<= 2) {
1241 bitmap_set_pending(counts
, block
);
1242 bitmap
->allclean
= 0;
1245 spin_unlock_irq(&counts
->lock
);
1247 /* Now start writeout on any page in NEEDWRITE that isn't DIRTY.
1248 * DIRTY pages need to be written by bitmap_unplug so it can wait
1250 * If we find any DIRTY page we stop there and let bitmap_unplug
1251 * handle all the rest. This is important in the case where
1252 * the first blocking holds the superblock and it has been updated.
1253 * We mustn't write any other blocks before the superblock.
1256 j
< bitmap
->storage
.file_pages
1257 && !test_bit(BITMAP_STALE
, &bitmap
->flags
);
1259 if (test_page_attr(bitmap
, j
,
1261 /* bitmap_unplug will handle the rest */
1263 if (test_and_clear_page_attr(bitmap
, j
,
1264 BITMAP_PAGE_NEEDWRITE
)) {
1265 write_page(bitmap
, bitmap
->storage
.filemap
[j
], 0);
1270 if (bitmap
->allclean
== 0)
1271 mddev
->thread
->timeout
=
1272 mddev
->bitmap_info
.daemon_sleep
;
1273 mutex_unlock(&mddev
->bitmap_info
.mutex
);
1276 static bitmap_counter_t
*bitmap_get_counter(struct bitmap_counts
*bitmap
,
1277 sector_t offset
, sector_t
*blocks
,
1279 __releases(bitmap
->lock
)
1280 __acquires(bitmap
->lock
)
1282 /* If 'create', we might release the lock and reclaim it.
1283 * The lock must have been taken with interrupts enabled.
1284 * If !create, we don't release the lock.
1286 sector_t chunk
= offset
>> bitmap
->chunkshift
;
1287 unsigned long page
= chunk
>> PAGE_COUNTER_SHIFT
;
1288 unsigned long pageoff
= (chunk
& PAGE_COUNTER_MASK
) << COUNTER_BYTE_SHIFT
;
1292 err
= bitmap_checkpage(bitmap
, page
, create
);
1294 if (bitmap
->bp
[page
].hijacked
||
1295 bitmap
->bp
[page
].map
== NULL
)
1296 csize
= ((sector_t
)1) << (bitmap
->chunkshift
+
1297 PAGE_COUNTER_SHIFT
- 1);
1299 csize
= ((sector_t
)1) << bitmap
->chunkshift
;
1300 *blocks
= csize
- (offset
& (csize
- 1));
1305 /* now locked ... */
1307 if (bitmap
->bp
[page
].hijacked
) { /* hijacked pointer */
1308 /* should we use the first or second counter field
1309 * of the hijacked pointer? */
1310 int hi
= (pageoff
> PAGE_COUNTER_MASK
);
1311 return &((bitmap_counter_t
*)
1312 &bitmap
->bp
[page
].map
)[hi
];
1313 } else /* page is allocated */
1314 return (bitmap_counter_t
*)
1315 &(bitmap
->bp
[page
].map
[pageoff
]);
1318 int bitmap_startwrite(struct bitmap
*bitmap
, sector_t offset
, unsigned long sectors
, int behind
)
1325 atomic_inc(&bitmap
->behind_writes
);
1326 bw
= atomic_read(&bitmap
->behind_writes
);
1327 if (bw
> bitmap
->behind_writes_used
)
1328 bitmap
->behind_writes_used
= bw
;
1330 pr_debug("inc write-behind count %d/%lu\n",
1331 bw
, bitmap
->mddev
->bitmap_info
.max_write_behind
);
1336 bitmap_counter_t
*bmc
;
1338 spin_lock_irq(&bitmap
->counts
.lock
);
1339 bmc
= bitmap_get_counter(&bitmap
->counts
, offset
, &blocks
, 1);
1341 spin_unlock_irq(&bitmap
->counts
.lock
);
1345 if (unlikely(COUNTER(*bmc
) == COUNTER_MAX
)) {
1346 DEFINE_WAIT(__wait
);
1347 /* note that it is safe to do the prepare_to_wait
1348 * after the test as long as we do it before dropping
1351 prepare_to_wait(&bitmap
->overflow_wait
, &__wait
,
1352 TASK_UNINTERRUPTIBLE
);
1353 spin_unlock_irq(&bitmap
->counts
.lock
);
1355 finish_wait(&bitmap
->overflow_wait
, &__wait
);
1361 bitmap_file_set_bit(bitmap
, offset
);
1362 bitmap_count_page(&bitmap
->counts
, offset
, 1);
1370 spin_unlock_irq(&bitmap
->counts
.lock
);
1373 if (sectors
> blocks
)
1380 EXPORT_SYMBOL(bitmap_startwrite
);
1382 void bitmap_endwrite(struct bitmap
*bitmap
, sector_t offset
, unsigned long sectors
,
1383 int success
, int behind
)
1388 if (atomic_dec_and_test(&bitmap
->behind_writes
))
1389 wake_up(&bitmap
->behind_wait
);
1390 pr_debug("dec write-behind count %d/%lu\n",
1391 atomic_read(&bitmap
->behind_writes
),
1392 bitmap
->mddev
->bitmap_info
.max_write_behind
);
1397 unsigned long flags
;
1398 bitmap_counter_t
*bmc
;
1400 spin_lock_irqsave(&bitmap
->counts
.lock
, flags
);
1401 bmc
= bitmap_get_counter(&bitmap
->counts
, offset
, &blocks
, 0);
1403 spin_unlock_irqrestore(&bitmap
->counts
.lock
, flags
);
1407 if (success
&& !bitmap
->mddev
->degraded
&&
1408 bitmap
->events_cleared
< bitmap
->mddev
->events
) {
1409 bitmap
->events_cleared
= bitmap
->mddev
->events
;
1410 bitmap
->need_sync
= 1;
1411 sysfs_notify_dirent_safe(bitmap
->sysfs_can_clear
);
1414 if (!success
&& !NEEDED(*bmc
))
1415 *bmc
|= NEEDED_MASK
;
1417 if (COUNTER(*bmc
) == COUNTER_MAX
)
1418 wake_up(&bitmap
->overflow_wait
);
1422 bitmap_set_pending(&bitmap
->counts
, offset
);
1423 bitmap
->allclean
= 0;
1425 spin_unlock_irqrestore(&bitmap
->counts
.lock
, flags
);
1427 if (sectors
> blocks
)
1433 EXPORT_SYMBOL(bitmap_endwrite
);
1435 static int __bitmap_start_sync(struct bitmap
*bitmap
, sector_t offset
, sector_t
*blocks
,
1438 bitmap_counter_t
*bmc
;
1440 if (bitmap
== NULL
) {/* FIXME or bitmap set as 'failed' */
1442 return 1; /* always resync if no bitmap */
1444 spin_lock_irq(&bitmap
->counts
.lock
);
1445 bmc
= bitmap_get_counter(&bitmap
->counts
, offset
, blocks
, 0);
1451 else if (NEEDED(*bmc
)) {
1453 if (!degraded
) { /* don't set/clear bits if degraded */
1454 *bmc
|= RESYNC_MASK
;
1455 *bmc
&= ~NEEDED_MASK
;
1459 spin_unlock_irq(&bitmap
->counts
.lock
);
1463 int bitmap_start_sync(struct bitmap
*bitmap
, sector_t offset
, sector_t
*blocks
,
1466 /* bitmap_start_sync must always report on multiples of whole
1467 * pages, otherwise resync (which is very PAGE_SIZE based) will
1469 * So call __bitmap_start_sync repeatedly (if needed) until
1470 * At least PAGE_SIZE>>9 blocks are covered.
1471 * Return the 'or' of the result.
1477 while (*blocks
< (PAGE_SIZE
>>9)) {
1478 rv
|= __bitmap_start_sync(bitmap
, offset
,
1479 &blocks1
, degraded
);
1485 EXPORT_SYMBOL(bitmap_start_sync
);
1487 void bitmap_end_sync(struct bitmap
*bitmap
, sector_t offset
, sector_t
*blocks
, int aborted
)
1489 bitmap_counter_t
*bmc
;
1490 unsigned long flags
;
1492 if (bitmap
== NULL
) {
1496 spin_lock_irqsave(&bitmap
->counts
.lock
, flags
);
1497 bmc
= bitmap_get_counter(&bitmap
->counts
, offset
, blocks
, 0);
1502 *bmc
&= ~RESYNC_MASK
;
1504 if (!NEEDED(*bmc
) && aborted
)
1505 *bmc
|= NEEDED_MASK
;
1508 bitmap_set_pending(&bitmap
->counts
, offset
);
1509 bitmap
->allclean
= 0;
1514 spin_unlock_irqrestore(&bitmap
->counts
.lock
, flags
);
1516 EXPORT_SYMBOL(bitmap_end_sync
);
1518 void bitmap_close_sync(struct bitmap
*bitmap
)
1520 /* Sync has finished, and any bitmap chunks that weren't synced
1521 * properly have been aborted. It remains to us to clear the
1522 * RESYNC bit wherever it is still on
1524 sector_t sector
= 0;
1528 while (sector
< bitmap
->mddev
->resync_max_sectors
) {
1529 bitmap_end_sync(bitmap
, sector
, &blocks
, 0);
1533 EXPORT_SYMBOL(bitmap_close_sync
);
1535 void bitmap_cond_end_sync(struct bitmap
*bitmap
, sector_t sector
)
1543 bitmap
->last_end_sync
= jiffies
;
1546 if (time_before(jiffies
, (bitmap
->last_end_sync
1547 + bitmap
->mddev
->bitmap_info
.daemon_sleep
)))
1549 wait_event(bitmap
->mddev
->recovery_wait
,
1550 atomic_read(&bitmap
->mddev
->recovery_active
) == 0);
1552 bitmap
->mddev
->curr_resync_completed
= sector
;
1553 set_bit(MD_CHANGE_CLEAN
, &bitmap
->mddev
->flags
);
1554 sector
&= ~((1ULL << bitmap
->counts
.chunkshift
) - 1);
1556 while (s
< sector
&& s
< bitmap
->mddev
->resync_max_sectors
) {
1557 bitmap_end_sync(bitmap
, s
, &blocks
, 0);
1560 bitmap
->last_end_sync
= jiffies
;
1561 sysfs_notify(&bitmap
->mddev
->kobj
, NULL
, "sync_completed");
1563 EXPORT_SYMBOL(bitmap_cond_end_sync
);
1565 static void bitmap_set_memory_bits(struct bitmap
*bitmap
, sector_t offset
, int needed
)
1567 /* For each chunk covered by any of these sectors, set the
1568 * counter to 2 and possibly set resync_needed. They should all
1569 * be 0 at this point
1573 bitmap_counter_t
*bmc
;
1574 spin_lock_irq(&bitmap
->counts
.lock
);
1575 bmc
= bitmap_get_counter(&bitmap
->counts
, offset
, &secs
, 1);
1577 spin_unlock_irq(&bitmap
->counts
.lock
);
1581 *bmc
= 2 | (needed
? NEEDED_MASK
: 0);
1582 bitmap_count_page(&bitmap
->counts
, offset
, 1);
1583 bitmap_set_pending(&bitmap
->counts
, offset
);
1584 bitmap
->allclean
= 0;
1586 spin_unlock_irq(&bitmap
->counts
.lock
);
1589 /* dirty the memory and file bits for bitmap chunks "s" to "e" */
1590 void bitmap_dirty_bits(struct bitmap
*bitmap
, unsigned long s
, unsigned long e
)
1592 unsigned long chunk
;
1594 for (chunk
= s
; chunk
<= e
; chunk
++) {
1595 sector_t sec
= (sector_t
)chunk
<< bitmap
->counts
.chunkshift
;
1596 bitmap_set_memory_bits(bitmap
, sec
, 1);
1597 bitmap_file_set_bit(bitmap
, sec
);
1598 if (sec
< bitmap
->mddev
->recovery_cp
)
1599 /* We are asserting that the array is dirty,
1600 * so move the recovery_cp address back so
1601 * that it is obvious that it is dirty
1603 bitmap
->mddev
->recovery_cp
= sec
;
1608 * flush out any pending updates
1610 void bitmap_flush(struct mddev
*mddev
)
1612 struct bitmap
*bitmap
= mddev
->bitmap
;
1615 if (!bitmap
) /* there was no bitmap */
1618 /* run the daemon_work three time to ensure everything is flushed
1621 sleep
= mddev
->bitmap_info
.daemon_sleep
* 2;
1622 bitmap
->daemon_lastrun
-= sleep
;
1623 bitmap_daemon_work(mddev
);
1624 bitmap
->daemon_lastrun
-= sleep
;
1625 bitmap_daemon_work(mddev
);
1626 bitmap
->daemon_lastrun
-= sleep
;
1627 bitmap_daemon_work(mddev
);
1628 bitmap_update_sb(bitmap
);
1632 * free memory that was allocated
1634 static void bitmap_free(struct bitmap
*bitmap
)
1636 unsigned long k
, pages
;
1637 struct bitmap_page
*bp
;
1639 if (!bitmap
) /* there was no bitmap */
1642 if (mddev_is_clustered(bitmap
->mddev
) && bitmap
->mddev
->cluster_info
)
1643 md_cluster_stop(bitmap
->mddev
);
1645 /* Shouldn't be needed - but just in case.... */
1646 wait_event(bitmap
->write_wait
,
1647 atomic_read(&bitmap
->pending_writes
) == 0);
1649 /* release the bitmap file */
1650 bitmap_file_unmap(&bitmap
->storage
);
1652 bp
= bitmap
->counts
.bp
;
1653 pages
= bitmap
->counts
.pages
;
1655 /* free all allocated memory */
1657 if (bp
) /* deallocate the page memory */
1658 for (k
= 0; k
< pages
; k
++)
1659 if (bp
[k
].map
&& !bp
[k
].hijacked
)
1665 void bitmap_destroy(struct mddev
*mddev
)
1667 struct bitmap
*bitmap
= mddev
->bitmap
;
1669 if (!bitmap
) /* there was no bitmap */
1672 mutex_lock(&mddev
->bitmap_info
.mutex
);
1673 spin_lock(&mddev
->lock
);
1674 mddev
->bitmap
= NULL
; /* disconnect from the md device */
1675 spin_unlock(&mddev
->lock
);
1676 mutex_unlock(&mddev
->bitmap_info
.mutex
);
1678 mddev
->thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
1680 if (bitmap
->sysfs_can_clear
)
1681 sysfs_put(bitmap
->sysfs_can_clear
);
1683 bitmap_free(bitmap
);
1687 * initialize the bitmap structure
1688 * if this returns an error, bitmap_destroy must be called to do clean up
1690 int bitmap_create(struct mddev
*mddev
)
1692 struct bitmap
*bitmap
;
1693 sector_t blocks
= mddev
->resync_max_sectors
;
1694 struct file
*file
= mddev
->bitmap_info
.file
;
1696 struct kernfs_node
*bm
= NULL
;
1698 BUILD_BUG_ON(sizeof(bitmap_super_t
) != 256);
1700 BUG_ON(file
&& mddev
->bitmap_info
.offset
);
1702 bitmap
= kzalloc(sizeof(*bitmap
), GFP_KERNEL
);
1706 spin_lock_init(&bitmap
->counts
.lock
);
1707 atomic_set(&bitmap
->pending_writes
, 0);
1708 init_waitqueue_head(&bitmap
->write_wait
);
1709 init_waitqueue_head(&bitmap
->overflow_wait
);
1710 init_waitqueue_head(&bitmap
->behind_wait
);
1712 bitmap
->mddev
= mddev
;
1715 bm
= sysfs_get_dirent(mddev
->kobj
.sd
, "bitmap");
1717 bitmap
->sysfs_can_clear
= sysfs_get_dirent(bm
, "can_clear");
1720 bitmap
->sysfs_can_clear
= NULL
;
1722 bitmap
->storage
.file
= file
;
1725 /* As future accesses to this file will use bmap,
1726 * and bypass the page cache, we must sync the file
1731 /* read superblock from bitmap file (this sets mddev->bitmap_info.chunksize) */
1732 if (!mddev
->bitmap_info
.external
) {
1734 * If 'MD_ARRAY_FIRST_USE' is set, then device-mapper is
1735 * instructing us to create a new on-disk bitmap instance.
1737 if (test_and_clear_bit(MD_ARRAY_FIRST_USE
, &mddev
->flags
))
1738 err
= bitmap_new_disk_sb(bitmap
);
1740 err
= bitmap_read_sb(bitmap
);
1743 if (mddev
->bitmap_info
.chunksize
== 0 ||
1744 mddev
->bitmap_info
.daemon_sleep
== 0)
1745 /* chunksize and time_base need to be
1752 bitmap
->daemon_lastrun
= jiffies
;
1753 err
= bitmap_resize(bitmap
, blocks
, mddev
->bitmap_info
.chunksize
, 1);
1757 printk(KERN_INFO
"created bitmap (%lu pages) for device %s\n",
1758 bitmap
->counts
.pages
, bmname(bitmap
));
1760 mddev
->bitmap
= bitmap
;
1761 return test_bit(BITMAP_WRITE_ERROR
, &bitmap
->flags
) ? -EIO
: 0;
1764 bitmap_free(bitmap
);
1768 int bitmap_load(struct mddev
*mddev
)
1772 sector_t sector
= 0;
1773 struct bitmap
*bitmap
= mddev
->bitmap
;
1778 /* Clear out old bitmap info first: Either there is none, or we
1779 * are resuming after someone else has possibly changed things,
1780 * so we should forget old cached info.
1781 * All chunks should be clean, but some might need_sync.
1783 while (sector
< mddev
->resync_max_sectors
) {
1785 bitmap_start_sync(bitmap
, sector
, &blocks
, 0);
1788 bitmap_close_sync(bitmap
);
1790 if (mddev
->degraded
== 0
1791 || bitmap
->events_cleared
== mddev
->events
)
1792 /* no need to keep dirty bits to optimise a
1793 * re-add of a missing device */
1794 start
= mddev
->recovery_cp
;
1796 mutex_lock(&mddev
->bitmap_info
.mutex
);
1797 err
= bitmap_init_from_disk(bitmap
, start
);
1798 mutex_unlock(&mddev
->bitmap_info
.mutex
);
1802 clear_bit(BITMAP_STALE
, &bitmap
->flags
);
1804 /* Kick recovery in case any bits were set */
1805 set_bit(MD_RECOVERY_NEEDED
, &bitmap
->mddev
->recovery
);
1807 mddev
->thread
->timeout
= mddev
->bitmap_info
.daemon_sleep
;
1808 md_wakeup_thread(mddev
->thread
);
1810 bitmap_update_sb(bitmap
);
1812 if (test_bit(BITMAP_WRITE_ERROR
, &bitmap
->flags
))
1817 EXPORT_SYMBOL_GPL(bitmap_load
);
1819 void bitmap_status(struct seq_file
*seq
, struct bitmap
*bitmap
)
1821 unsigned long chunk_kb
;
1822 struct bitmap_counts
*counts
;
1827 counts
= &bitmap
->counts
;
1829 chunk_kb
= bitmap
->mddev
->bitmap_info
.chunksize
>> 10;
1830 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
1832 counts
->pages
- counts
->missing_pages
,
1834 (counts
->pages
- counts
->missing_pages
)
1835 << (PAGE_SHIFT
- 10),
1836 chunk_kb
? chunk_kb
: bitmap
->mddev
->bitmap_info
.chunksize
,
1837 chunk_kb
? "KB" : "B");
1838 if (bitmap
->storage
.file
) {
1839 seq_printf(seq
, ", file: ");
1840 seq_path(seq
, &bitmap
->storage
.file
->f_path
, " \t\n");
1843 seq_printf(seq
, "\n");
1846 int bitmap_resize(struct bitmap
*bitmap
, sector_t blocks
,
1847 int chunksize
, int init
)
1849 /* If chunk_size is 0, choose an appropriate chunk size.
1850 * Then possibly allocate new storage space.
1851 * Then quiesce, copy bits, replace bitmap, and re-start
1853 * This function is called both to set up the initial bitmap
1854 * and to resize the bitmap while the array is active.
1855 * If this happens as a result of the array being resized,
1856 * chunksize will be zero, and we need to choose a suitable
1857 * chunksize, otherwise we use what we are given.
1859 struct bitmap_storage store
;
1860 struct bitmap_counts old_counts
;
1861 unsigned long chunks
;
1863 sector_t old_blocks
, new_blocks
;
1867 struct bitmap_page
*new_bp
;
1869 if (chunksize
== 0) {
1870 /* If there is enough space, leave the chunk size unchanged,
1871 * else increase by factor of two until there is enough space.
1874 long space
= bitmap
->mddev
->bitmap_info
.space
;
1877 /* We don't know how much space there is, so limit
1878 * to current size - in sectors.
1880 bytes
= DIV_ROUND_UP(bitmap
->counts
.chunks
, 8);
1881 if (!bitmap
->mddev
->bitmap_info
.external
)
1882 bytes
+= sizeof(bitmap_super_t
);
1883 space
= DIV_ROUND_UP(bytes
, 512);
1884 bitmap
->mddev
->bitmap_info
.space
= space
;
1886 chunkshift
= bitmap
->counts
.chunkshift
;
1889 /* 'chunkshift' is shift from block size to chunk size */
1891 chunks
= DIV_ROUND_UP_SECTOR_T(blocks
, 1 << chunkshift
);
1892 bytes
= DIV_ROUND_UP(chunks
, 8);
1893 if (!bitmap
->mddev
->bitmap_info
.external
)
1894 bytes
+= sizeof(bitmap_super_t
);
1895 } while (bytes
> (space
<< 9));
1897 chunkshift
= ffz(~chunksize
) - BITMAP_BLOCK_SHIFT
;
1899 chunks
= DIV_ROUND_UP_SECTOR_T(blocks
, 1 << chunkshift
);
1900 memset(&store
, 0, sizeof(store
));
1901 if (bitmap
->mddev
->bitmap_info
.offset
|| bitmap
->mddev
->bitmap_info
.file
)
1902 ret
= bitmap_storage_alloc(&store
, chunks
,
1903 !bitmap
->mddev
->bitmap_info
.external
,
1904 bitmap
->cluster_slot
);
1908 pages
= DIV_ROUND_UP(chunks
, PAGE_COUNTER_RATIO
);
1910 new_bp
= kzalloc(pages
* sizeof(*new_bp
), GFP_KERNEL
);
1913 bitmap_file_unmap(&store
);
1918 bitmap
->mddev
->pers
->quiesce(bitmap
->mddev
, 1);
1920 store
.file
= bitmap
->storage
.file
;
1921 bitmap
->storage
.file
= NULL
;
1923 if (store
.sb_page
&& bitmap
->storage
.sb_page
)
1924 memcpy(page_address(store
.sb_page
),
1925 page_address(bitmap
->storage
.sb_page
),
1926 sizeof(bitmap_super_t
));
1927 bitmap_file_unmap(&bitmap
->storage
);
1928 bitmap
->storage
= store
;
1930 old_counts
= bitmap
->counts
;
1931 bitmap
->counts
.bp
= new_bp
;
1932 bitmap
->counts
.pages
= pages
;
1933 bitmap
->counts
.missing_pages
= pages
;
1934 bitmap
->counts
.chunkshift
= chunkshift
;
1935 bitmap
->counts
.chunks
= chunks
;
1936 bitmap
->mddev
->bitmap_info
.chunksize
= 1 << (chunkshift
+
1937 BITMAP_BLOCK_SHIFT
);
1939 blocks
= min(old_counts
.chunks
<< old_counts
.chunkshift
,
1940 chunks
<< chunkshift
);
1942 spin_lock_irq(&bitmap
->counts
.lock
);
1943 for (block
= 0; block
< blocks
; ) {
1944 bitmap_counter_t
*bmc_old
, *bmc_new
;
1947 bmc_old
= bitmap_get_counter(&old_counts
, block
,
1949 set
= bmc_old
&& NEEDED(*bmc_old
);
1952 bmc_new
= bitmap_get_counter(&bitmap
->counts
, block
,
1954 if (*bmc_new
== 0) {
1955 /* need to set on-disk bits too. */
1956 sector_t end
= block
+ new_blocks
;
1957 sector_t start
= block
>> chunkshift
;
1958 start
<<= chunkshift
;
1959 while (start
< end
) {
1960 bitmap_file_set_bit(bitmap
, block
);
1961 start
+= 1 << chunkshift
;
1964 bitmap_count_page(&bitmap
->counts
,
1966 bitmap_set_pending(&bitmap
->counts
,
1969 *bmc_new
|= NEEDED_MASK
;
1970 if (new_blocks
< old_blocks
)
1971 old_blocks
= new_blocks
;
1973 block
+= old_blocks
;
1978 while (block
< (chunks
<< chunkshift
)) {
1979 bitmap_counter_t
*bmc
;
1980 bmc
= bitmap_get_counter(&bitmap
->counts
, block
,
1983 /* new space. It needs to be resynced, so
1984 * we set NEEDED_MASK.
1987 *bmc
= NEEDED_MASK
| 2;
1988 bitmap_count_page(&bitmap
->counts
,
1990 bitmap_set_pending(&bitmap
->counts
,
1994 block
+= new_blocks
;
1996 for (i
= 0; i
< bitmap
->storage
.file_pages
; i
++)
1997 set_page_attr(bitmap
, i
, BITMAP_PAGE_DIRTY
);
1999 spin_unlock_irq(&bitmap
->counts
.lock
);
2002 bitmap_unplug(bitmap
);
2003 bitmap
->mddev
->pers
->quiesce(bitmap
->mddev
, 0);
2009 EXPORT_SYMBOL_GPL(bitmap_resize
);
2012 location_show(struct mddev
*mddev
, char *page
)
2015 if (mddev
->bitmap_info
.file
)
2016 len
= sprintf(page
, "file");
2017 else if (mddev
->bitmap_info
.offset
)
2018 len
= sprintf(page
, "%+lld", (long long)mddev
->bitmap_info
.offset
);
2020 len
= sprintf(page
, "none");
2021 len
+= sprintf(page
+len
, "\n");
2026 location_store(struct mddev
*mddev
, const char *buf
, size_t len
)
2030 if (!mddev
->pers
->quiesce
)
2032 if (mddev
->recovery
|| mddev
->sync_thread
)
2036 if (mddev
->bitmap
|| mddev
->bitmap_info
.file
||
2037 mddev
->bitmap_info
.offset
) {
2038 /* bitmap already configured. Only option is to clear it */
2039 if (strncmp(buf
, "none", 4) != 0)
2042 mddev
->pers
->quiesce(mddev
, 1);
2043 bitmap_destroy(mddev
);
2044 mddev
->pers
->quiesce(mddev
, 0);
2046 mddev
->bitmap_info
.offset
= 0;
2047 if (mddev
->bitmap_info
.file
) {
2048 struct file
*f
= mddev
->bitmap_info
.file
;
2049 mddev
->bitmap_info
.file
= NULL
;
2053 /* No bitmap, OK to set a location */
2055 if (strncmp(buf
, "none", 4) == 0)
2056 /* nothing to be done */;
2057 else if (strncmp(buf
, "file:", 5) == 0) {
2058 /* Not supported yet */
2063 rv
= kstrtoll(buf
+1, 10, &offset
);
2065 rv
= kstrtoll(buf
, 10, &offset
);
2070 if (mddev
->bitmap_info
.external
== 0 &&
2071 mddev
->major_version
== 0 &&
2072 offset
!= mddev
->bitmap_info
.default_offset
)
2074 mddev
->bitmap_info
.offset
= offset
;
2076 mddev
->pers
->quiesce(mddev
, 1);
2077 rv
= bitmap_create(mddev
);
2079 rv
= bitmap_load(mddev
);
2081 bitmap_destroy(mddev
);
2082 mddev
->bitmap_info
.offset
= 0;
2084 mddev
->pers
->quiesce(mddev
, 0);
2090 if (!mddev
->external
) {
2091 /* Ensure new bitmap info is stored in
2092 * metadata promptly.
2094 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2095 md_wakeup_thread(mddev
->thread
);
2100 static struct md_sysfs_entry bitmap_location
=
2101 __ATTR(location
, S_IRUGO
|S_IWUSR
, location_show
, location_store
);
2103 /* 'bitmap/space' is the space available at 'location' for the
2104 * bitmap. This allows the kernel to know when it is safe to
2105 * resize the bitmap to match a resized array.
2108 space_show(struct mddev
*mddev
, char *page
)
2110 return sprintf(page
, "%lu\n", mddev
->bitmap_info
.space
);
2114 space_store(struct mddev
*mddev
, const char *buf
, size_t len
)
2116 unsigned long sectors
;
2119 rv
= kstrtoul(buf
, 10, §ors
);
2126 if (mddev
->bitmap
&&
2127 sectors
< (mddev
->bitmap
->storage
.bytes
+ 511) >> 9)
2128 return -EFBIG
; /* Bitmap is too big for this small space */
2130 /* could make sure it isn't too big, but that isn't really
2131 * needed - user-space should be careful.
2133 mddev
->bitmap_info
.space
= sectors
;
2137 static struct md_sysfs_entry bitmap_space
=
2138 __ATTR(space
, S_IRUGO
|S_IWUSR
, space_show
, space_store
);
2141 timeout_show(struct mddev
*mddev
, char *page
)
2144 unsigned long secs
= mddev
->bitmap_info
.daemon_sleep
/ HZ
;
2145 unsigned long jifs
= mddev
->bitmap_info
.daemon_sleep
% HZ
;
2147 len
= sprintf(page
, "%lu", secs
);
2149 len
+= sprintf(page
+len
, ".%03u", jiffies_to_msecs(jifs
));
2150 len
+= sprintf(page
+len
, "\n");
2155 timeout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
2157 /* timeout can be set at any time */
2158 unsigned long timeout
;
2159 int rv
= strict_strtoul_scaled(buf
, &timeout
, 4);
2163 /* just to make sure we don't overflow... */
2164 if (timeout
>= LONG_MAX
/ HZ
)
2167 timeout
= timeout
* HZ
/ 10000;
2169 if (timeout
>= MAX_SCHEDULE_TIMEOUT
)
2170 timeout
= MAX_SCHEDULE_TIMEOUT
-1;
2173 mddev
->bitmap_info
.daemon_sleep
= timeout
;
2174 if (mddev
->thread
) {
2175 /* if thread->timeout is MAX_SCHEDULE_TIMEOUT, then
2176 * the bitmap is all clean and we don't need to
2177 * adjust the timeout right now
2179 if (mddev
->thread
->timeout
< MAX_SCHEDULE_TIMEOUT
) {
2180 mddev
->thread
->timeout
= timeout
;
2181 md_wakeup_thread(mddev
->thread
);
2187 static struct md_sysfs_entry bitmap_timeout
=
2188 __ATTR(time_base
, S_IRUGO
|S_IWUSR
, timeout_show
, timeout_store
);
2191 backlog_show(struct mddev
*mddev
, char *page
)
2193 return sprintf(page
, "%lu\n", mddev
->bitmap_info
.max_write_behind
);
2197 backlog_store(struct mddev
*mddev
, const char *buf
, size_t len
)
2199 unsigned long backlog
;
2200 int rv
= kstrtoul(buf
, 10, &backlog
);
2203 if (backlog
> COUNTER_MAX
)
2205 mddev
->bitmap_info
.max_write_behind
= backlog
;
2209 static struct md_sysfs_entry bitmap_backlog
=
2210 __ATTR(backlog
, S_IRUGO
|S_IWUSR
, backlog_show
, backlog_store
);
2213 chunksize_show(struct mddev
*mddev
, char *page
)
2215 return sprintf(page
, "%lu\n", mddev
->bitmap_info
.chunksize
);
2219 chunksize_store(struct mddev
*mddev
, const char *buf
, size_t len
)
2221 /* Can only be changed when no bitmap is active */
2223 unsigned long csize
;
2226 rv
= kstrtoul(buf
, 10, &csize
);
2230 !is_power_of_2(csize
))
2232 mddev
->bitmap_info
.chunksize
= csize
;
2236 static struct md_sysfs_entry bitmap_chunksize
=
2237 __ATTR(chunksize
, S_IRUGO
|S_IWUSR
, chunksize_show
, chunksize_store
);
2239 static ssize_t
metadata_show(struct mddev
*mddev
, char *page
)
2241 if (mddev_is_clustered(mddev
))
2242 return sprintf(page
, "clustered\n");
2243 return sprintf(page
, "%s\n", (mddev
->bitmap_info
.external
2244 ? "external" : "internal"));
2247 static ssize_t
metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
2249 if (mddev
->bitmap
||
2250 mddev
->bitmap_info
.file
||
2251 mddev
->bitmap_info
.offset
)
2253 if (strncmp(buf
, "external", 8) == 0)
2254 mddev
->bitmap_info
.external
= 1;
2255 else if ((strncmp(buf
, "internal", 8) == 0) ||
2256 (strncmp(buf
, "clustered", 9) == 0))
2257 mddev
->bitmap_info
.external
= 0;
2263 static struct md_sysfs_entry bitmap_metadata
=
2264 __ATTR(metadata
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
2266 static ssize_t
can_clear_show(struct mddev
*mddev
, char *page
)
2269 spin_lock(&mddev
->lock
);
2271 len
= sprintf(page
, "%s\n", (mddev
->bitmap
->need_sync
?
2274 len
= sprintf(page
, "\n");
2275 spin_unlock(&mddev
->lock
);
2279 static ssize_t
can_clear_store(struct mddev
*mddev
, const char *buf
, size_t len
)
2281 if (mddev
->bitmap
== NULL
)
2283 if (strncmp(buf
, "false", 5) == 0)
2284 mddev
->bitmap
->need_sync
= 1;
2285 else if (strncmp(buf
, "true", 4) == 0) {
2286 if (mddev
->degraded
)
2288 mddev
->bitmap
->need_sync
= 0;
2294 static struct md_sysfs_entry bitmap_can_clear
=
2295 __ATTR(can_clear
, S_IRUGO
|S_IWUSR
, can_clear_show
, can_clear_store
);
2298 behind_writes_used_show(struct mddev
*mddev
, char *page
)
2301 spin_lock(&mddev
->lock
);
2302 if (mddev
->bitmap
== NULL
)
2303 ret
= sprintf(page
, "0\n");
2305 ret
= sprintf(page
, "%lu\n",
2306 mddev
->bitmap
->behind_writes_used
);
2307 spin_unlock(&mddev
->lock
);
2312 behind_writes_used_reset(struct mddev
*mddev
, const char *buf
, size_t len
)
2315 mddev
->bitmap
->behind_writes_used
= 0;
2319 static struct md_sysfs_entry max_backlog_used
=
2320 __ATTR(max_backlog_used
, S_IRUGO
| S_IWUSR
,
2321 behind_writes_used_show
, behind_writes_used_reset
);
2323 static struct attribute
*md_bitmap_attrs
[] = {
2324 &bitmap_location
.attr
,
2326 &bitmap_timeout
.attr
,
2327 &bitmap_backlog
.attr
,
2328 &bitmap_chunksize
.attr
,
2329 &bitmap_metadata
.attr
,
2330 &bitmap_can_clear
.attr
,
2331 &max_backlog_used
.attr
,
2334 struct attribute_group md_bitmap_group
= {
2336 .attrs
= md_bitmap_attrs
,