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
10 * - added bitmap daemon (to asynchronously clear bitmap bits from disk)
16 * flush after percent set rather than just time based. (maybe both).
17 * wait if count gets too high, wake when it drops to half.
18 * allow bitmap to be mirrored with superblock (before or after...)
19 * allow hot-add to re-instate a current device.
20 * allow hot-add of bitmap after quiessing device
23 #include <linux/module.h>
24 #include <linux/version.h>
25 #include <linux/errno.h>
26 #include <linux/slab.h>
27 #include <linux/init.h>
28 #include <linux/config.h>
29 #include <linux/timer.h>
30 #include <linux/sched.h>
31 #include <linux/list.h>
32 #include <linux/file.h>
33 #include <linux/mount.h>
34 #include <linux/buffer_head.h>
35 #include <linux/raid/md.h>
36 #include <linux/raid/bitmap.h>
43 /* these are for debugging purposes only! */
45 /* define one and only one of these */
46 #define INJECT_FAULTS_1 0 /* cause bitmap_alloc_page to fail always */
47 #define INJECT_FAULTS_2 0 /* cause bitmap file to be kicked when first bit set*/
48 #define INJECT_FAULTS_3 0 /* treat bitmap file as kicked at init time */
49 #define INJECT_FAULTS_4 0 /* undef */
50 #define INJECT_FAULTS_5 0 /* undef */
51 #define INJECT_FAULTS_6 0
53 /* if these are defined, the driver will fail! debug only */
54 #define INJECT_FATAL_FAULT_1 0 /* fail kmalloc, causing bitmap_create to fail */
55 #define INJECT_FATAL_FAULT_2 0 /* undef */
56 #define INJECT_FATAL_FAULT_3 0 /* undef */
59 //#define DPRINTK PRINTK /* set this NULL to avoid verbose debug output */
60 #define DPRINTK(x...) do { } while(0)
64 # define PRINTK(x...) printk(KERN_DEBUG x)
70 static inline char * bmname(struct bitmap
*bitmap
)
72 return bitmap
->mddev
? mdname(bitmap
->mddev
) : "mdX";
77 * test if the bitmap is active
79 int bitmap_active(struct bitmap
*bitmap
)
86 spin_lock_irqsave(&bitmap
->lock
, flags
);
87 res
= bitmap
->flags
& BITMAP_ACTIVE
;
88 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
92 #define WRITE_POOL_SIZE 256
93 /* mempool for queueing pending writes on the bitmap file */
94 static void *write_pool_alloc(unsigned int gfp_flags
, void *data
)
96 return kmalloc(sizeof(struct page_list
), gfp_flags
);
99 static void write_pool_free(void *ptr
, void *data
)
105 * just a placeholder - calls kmalloc for bitmap pages
107 static unsigned char *bitmap_alloc_page(struct bitmap
*bitmap
)
111 #ifdef INJECT_FAULTS_1
114 page
= kmalloc(PAGE_SIZE
, GFP_NOIO
);
117 printk("%s: bitmap_alloc_page FAILED\n", bmname(bitmap
));
119 PRINTK("%s: bitmap_alloc_page: allocated page at %p\n",
120 bmname(bitmap
), page
);
125 * for now just a placeholder -- just calls kfree for bitmap pages
127 static void bitmap_free_page(struct bitmap
*bitmap
, unsigned char *page
)
129 PRINTK("%s: bitmap_free_page: free page %p\n", bmname(bitmap
), page
);
134 * check a page and, if necessary, allocate it (or hijack it if the alloc fails)
136 * 1) check to see if this page is allocated, if it's not then try to alloc
137 * 2) if the alloc fails, set the page's hijacked flag so we'll use the
138 * page pointer directly as a counter
140 * if we find our page, we increment the page's refcount so that it stays
141 * allocated while we're using it
143 static int bitmap_checkpage(struct bitmap
*bitmap
, unsigned long page
, int create
)
145 unsigned char *mappage
;
147 if (page
>= bitmap
->pages
) {
149 "%s: invalid bitmap page request: %lu (> %lu)\n",
150 bmname(bitmap
), page
, bitmap
->pages
-1);
155 if (bitmap
->bp
[page
].hijacked
) /* it's hijacked, don't try to alloc */
158 if (bitmap
->bp
[page
].map
) /* page is already allocated, just return */
164 spin_unlock_irq(&bitmap
->lock
);
166 /* this page has not been allocated yet */
168 if ((mappage
= bitmap_alloc_page(bitmap
)) == NULL
) {
169 PRINTK("%s: bitmap map page allocation failed, hijacking\n",
171 /* failed - set the hijacked flag so that we can use the
172 * pointer as a counter */
173 spin_lock_irq(&bitmap
->lock
);
174 if (!bitmap
->bp
[page
].map
)
175 bitmap
->bp
[page
].hijacked
= 1;
181 spin_lock_irq(&bitmap
->lock
);
183 /* recheck the page */
185 if (bitmap
->bp
[page
].map
|| bitmap
->bp
[page
].hijacked
) {
186 /* somebody beat us to getting the page */
187 bitmap_free_page(bitmap
, mappage
);
191 /* no page was in place and we have one, so install it */
193 memset(mappage
, 0, PAGE_SIZE
);
194 bitmap
->bp
[page
].map
= mappage
;
195 bitmap
->missing_pages
--;
201 /* if page is completely empty, put it back on the free list, or dealloc it */
202 /* if page was hijacked, unmark the flag so it might get alloced next time */
203 /* Note: lock should be held when calling this */
204 static inline void bitmap_checkfree(struct bitmap
*bitmap
, unsigned long page
)
208 if (bitmap
->bp
[page
].count
) /* page is still busy */
211 /* page is no longer in use, it can be released */
213 if (bitmap
->bp
[page
].hijacked
) { /* page was hijacked, undo this now */
214 bitmap
->bp
[page
].hijacked
= 0;
215 bitmap
->bp
[page
].map
= NULL
;
219 /* normal case, free the page */
222 /* actually ... let's not. We will probably need the page again exactly when
223 * memory is tight and we are flusing to disk
227 ptr
= bitmap
->bp
[page
].map
;
228 bitmap
->bp
[page
].map
= NULL
;
229 bitmap
->missing_pages
++;
230 bitmap_free_page(bitmap
, ptr
);
237 * bitmap file handling - read and write the bitmap file and its superblock
240 /* copy the pathname of a file to a buffer */
241 char *file_path(struct file
*file
, char *buf
, int count
)
252 buf
= d_path(d
, v
, buf
, count
);
254 return IS_ERR(buf
) ? NULL
: buf
;
258 * basic page I/O operations
261 /* IO operations when bitmap is stored near all superblocks */
262 static struct page
*read_sb_page(mddev_t
*mddev
, long offset
, unsigned long index
)
264 /* choose a good rdev and read the page from there */
267 struct list_head
*tmp
;
268 struct page
*page
= alloc_page(GFP_KERNEL
);
272 return ERR_PTR(-ENOMEM
);
274 ITERATE_RDEV(mddev
, rdev
, tmp
)
275 if (rdev
->in_sync
&& !rdev
->faulty
)
277 return ERR_PTR(-EIO
);
280 target
= (rdev
->sb_offset
<< 1) + offset
+ index
* (PAGE_SIZE
/512);
282 } while (!sync_page_io(rdev
->bdev
, target
, PAGE_SIZE
, page
, READ
));
288 static int write_sb_page(mddev_t
*mddev
, long offset
, struct page
*page
, int wait
)
291 struct list_head
*tmp
;
293 ITERATE_RDEV(mddev
, rdev
, tmp
)
294 if (rdev
->in_sync
&& !rdev
->faulty
)
295 md_super_write(mddev
, rdev
,
296 (rdev
->sb_offset
<<1) + offset
297 + page
->index
* (PAGE_SIZE
/512),
302 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->pending_writes
)==0);
307 * write out a page to a file
309 static int write_page(struct bitmap
*bitmap
, struct page
*page
, int wait
)
313 if (bitmap
->file
== NULL
)
314 return write_sb_page(bitmap
->mddev
, bitmap
->offset
, page
, wait
);
319 if (TestSetPageLocked(page
))
320 return -EAGAIN
; /* already locked */
321 if (PageWriteback(page
)) {
327 ret
= page
->mapping
->a_ops
->prepare_write(NULL
, page
, 0, PAGE_SIZE
);
329 ret
= page
->mapping
->a_ops
->commit_write(NULL
, page
, 0,
336 set_page_dirty(page
); /* force it to be written out */
339 /* add to list to be waited for by daemon */
340 struct page_list
*item
= mempool_alloc(bitmap
->write_pool
, GFP_NOIO
);
342 page_cache_get(page
);
343 spin_lock(&bitmap
->write_lock
);
344 list_add(&item
->list
, &bitmap
->complete_pages
);
345 spin_unlock(&bitmap
->write_lock
);
346 md_wakeup_thread(bitmap
->writeback_daemon
);
348 return write_one_page(page
, wait
);
351 /* read a page from a file, pinning it into cache, and return bytes_read */
352 static struct page
*read_page(struct file
*file
, unsigned long index
,
353 unsigned long *bytes_read
)
355 struct inode
*inode
= file
->f_mapping
->host
;
356 struct page
*page
= NULL
;
357 loff_t isize
= i_size_read(inode
);
358 unsigned long end_index
= isize
>> PAGE_CACHE_SHIFT
;
360 PRINTK("read bitmap file (%dB @ %Lu)\n", (int)PAGE_CACHE_SIZE
,
361 (unsigned long long)index
<< PAGE_CACHE_SHIFT
);
363 page
= read_cache_page(inode
->i_mapping
, index
,
364 (filler_t
*)inode
->i_mapping
->a_ops
->readpage
, file
);
367 wait_on_page_locked(page
);
368 if (!PageUptodate(page
) || PageError(page
)) {
369 page_cache_release(page
);
370 page
= ERR_PTR(-EIO
);
374 if (index
> end_index
) /* we have read beyond EOF */
376 else if (index
== end_index
) /* possible short read */
377 *bytes_read
= isize
& ~PAGE_CACHE_MASK
;
379 *bytes_read
= PAGE_CACHE_SIZE
; /* got a full page */
382 printk(KERN_ALERT
"md: bitmap read error: (%dB @ %Lu): %ld\n",
383 (int)PAGE_CACHE_SIZE
,
384 (unsigned long long)index
<< PAGE_CACHE_SHIFT
,
390 * bitmap file superblock operations
393 /* update the event counter and sync the superblock to disk */
394 int bitmap_update_sb(struct bitmap
*bitmap
)
399 if (!bitmap
|| !bitmap
->mddev
) /* no bitmap for this array */
401 spin_lock_irqsave(&bitmap
->lock
, flags
);
402 if (!bitmap
->sb_page
) { /* no superblock */
403 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
406 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
407 sb
= (bitmap_super_t
*)kmap(bitmap
->sb_page
);
408 sb
->events
= cpu_to_le64(bitmap
->mddev
->events
);
409 if (!bitmap
->mddev
->degraded
)
410 sb
->events_cleared
= cpu_to_le64(bitmap
->mddev
->events
);
411 kunmap(bitmap
->sb_page
);
412 return write_page(bitmap
, bitmap
->sb_page
, 1);
415 /* print out the bitmap file superblock */
416 void bitmap_print_sb(struct bitmap
*bitmap
)
420 if (!bitmap
|| !bitmap
->sb_page
)
422 sb
= (bitmap_super_t
*)kmap(bitmap
->sb_page
);
423 printk(KERN_DEBUG
"%s: bitmap file superblock:\n", bmname(bitmap
));
424 printk(KERN_DEBUG
" magic: %08x\n", le32_to_cpu(sb
->magic
));
425 printk(KERN_DEBUG
" version: %d\n", le32_to_cpu(sb
->version
));
426 printk(KERN_DEBUG
" uuid: %08x.%08x.%08x.%08x\n",
427 *(__u32
*)(sb
->uuid
+0),
428 *(__u32
*)(sb
->uuid
+4),
429 *(__u32
*)(sb
->uuid
+8),
430 *(__u32
*)(sb
->uuid
+12));
431 printk(KERN_DEBUG
" events: %llu\n",
432 (unsigned long long) le64_to_cpu(sb
->events
));
433 printk(KERN_DEBUG
"events cleared: %llu\n",
434 (unsigned long long) le64_to_cpu(sb
->events_cleared
));
435 printk(KERN_DEBUG
" state: %08x\n", le32_to_cpu(sb
->state
));
436 printk(KERN_DEBUG
" chunksize: %d B\n", le32_to_cpu(sb
->chunksize
));
437 printk(KERN_DEBUG
" daemon sleep: %ds\n", le32_to_cpu(sb
->daemon_sleep
));
438 printk(KERN_DEBUG
" sync size: %llu KB\n",
439 (unsigned long long)le64_to_cpu(sb
->sync_size
)/2);
440 kunmap(bitmap
->sb_page
);
443 /* read the superblock from the bitmap file and initialize some bitmap fields */
444 static int bitmap_read_sb(struct bitmap
*bitmap
)
448 unsigned long chunksize
, daemon_sleep
;
449 unsigned long bytes_read
;
450 unsigned long long events
;
453 /* page 0 is the superblock, read it... */
455 bitmap
->sb_page
= read_page(bitmap
->file
, 0, &bytes_read
);
457 bitmap
->sb_page
= read_sb_page(bitmap
->mddev
, bitmap
->offset
, 0);
458 bytes_read
= PAGE_SIZE
;
460 if (IS_ERR(bitmap
->sb_page
)) {
461 err
= PTR_ERR(bitmap
->sb_page
);
462 bitmap
->sb_page
= NULL
;
466 sb
= (bitmap_super_t
*)kmap(bitmap
->sb_page
);
468 if (bytes_read
< sizeof(*sb
)) { /* short read */
469 printk(KERN_INFO
"%s: bitmap file superblock truncated\n",
475 chunksize
= le32_to_cpu(sb
->chunksize
);
476 daemon_sleep
= le32_to_cpu(sb
->daemon_sleep
);
478 /* verify that the bitmap-specific fields are valid */
479 if (sb
->magic
!= cpu_to_le32(BITMAP_MAGIC
))
480 reason
= "bad magic";
481 else if (sb
->version
!= cpu_to_le32(BITMAP_MAJOR
))
482 reason
= "unrecognized superblock version";
483 else if (chunksize
< 512 || chunksize
> (1024 * 1024 * 4))
484 reason
= "bitmap chunksize out of range (512B - 4MB)";
485 else if ((1 << ffz(~chunksize
)) != chunksize
)
486 reason
= "bitmap chunksize not a power of 2";
487 else if (daemon_sleep
< 1 || daemon_sleep
> 15)
488 reason
= "daemon sleep period out of range";
490 printk(KERN_INFO
"%s: invalid bitmap file superblock: %s\n",
491 bmname(bitmap
), reason
);
495 /* keep the array size field of the bitmap superblock up to date */
496 sb
->sync_size
= cpu_to_le64(bitmap
->mddev
->resync_max_sectors
);
498 if (!bitmap
->mddev
->persistent
)
502 * if we have a persistent array superblock, compare the
503 * bitmap's UUID and event counter to the mddev's
505 if (memcmp(sb
->uuid
, bitmap
->mddev
->uuid
, 16)) {
506 printk(KERN_INFO
"%s: bitmap superblock UUID mismatch\n",
510 events
= le64_to_cpu(sb
->events
);
511 if (events
< bitmap
->mddev
->events
) {
512 printk(KERN_INFO
"%s: bitmap file is out of date (%llu < %llu) "
513 "-- forcing full recovery\n", bmname(bitmap
), events
,
514 (unsigned long long) bitmap
->mddev
->events
);
515 sb
->state
|= BITMAP_STALE
;
518 /* assign fields using values from superblock */
519 bitmap
->chunksize
= chunksize
;
520 bitmap
->daemon_sleep
= daemon_sleep
;
521 bitmap
->flags
|= sb
->state
;
522 bitmap
->events_cleared
= le64_to_cpu(sb
->events_cleared
);
525 kunmap(bitmap
->sb_page
);
527 bitmap_print_sb(bitmap
);
531 enum bitmap_mask_op
{
536 /* record the state of the bitmap in the superblock */
537 static void bitmap_mask_state(struct bitmap
*bitmap
, enum bitmap_state bits
,
538 enum bitmap_mask_op op
)
543 spin_lock_irqsave(&bitmap
->lock
, flags
);
544 if (!bitmap
|| !bitmap
->sb_page
) { /* can't set the state */
545 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
548 page_cache_get(bitmap
->sb_page
);
549 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
550 sb
= (bitmap_super_t
*)kmap(bitmap
->sb_page
);
552 case MASK_SET
: sb
->state
|= bits
;
554 case MASK_UNSET
: sb
->state
&= ~bits
;
558 kunmap(bitmap
->sb_page
);
559 page_cache_release(bitmap
->sb_page
);
563 * general bitmap file operations
566 /* calculate the index of the page that contains this bit */
567 static inline unsigned long file_page_index(unsigned long chunk
)
569 return CHUNK_BIT_OFFSET(chunk
) >> PAGE_BIT_SHIFT
;
572 /* calculate the (bit) offset of this bit within a page */
573 static inline unsigned long file_page_offset(unsigned long chunk
)
575 return CHUNK_BIT_OFFSET(chunk
) & (PAGE_BITS
- 1);
579 * return a pointer to the page in the filemap that contains the given bit
581 * this lookup is complicated by the fact that the bitmap sb might be exactly
582 * 1 page (e.g., x86) or less than 1 page -- so the bitmap might start on page
585 static inline struct page
*filemap_get_page(struct bitmap
*bitmap
,
588 return bitmap
->filemap
[file_page_index(chunk
) - file_page_index(0)];
592 static void bitmap_file_unmap(struct bitmap
*bitmap
)
594 struct page
**map
, *sb_page
;
599 spin_lock_irqsave(&bitmap
->lock
, flags
);
600 map
= bitmap
->filemap
;
601 bitmap
->filemap
= NULL
;
602 attr
= bitmap
->filemap_attr
;
603 bitmap
->filemap_attr
= NULL
;
604 pages
= bitmap
->file_pages
;
605 bitmap
->file_pages
= 0;
606 sb_page
= bitmap
->sb_page
;
607 bitmap
->sb_page
= NULL
;
608 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
611 if (map
[pages
]->index
!= 0) /* 0 is sb_page, release it below */
612 page_cache_release(map
[pages
]);
617 page_cache_release(sb_page
);
620 static void bitmap_stop_daemons(struct bitmap
*bitmap
);
622 /* dequeue the next item in a page list -- don't call from irq context */
623 static struct page_list
*dequeue_page(struct bitmap
*bitmap
)
625 struct page_list
*item
= NULL
;
626 struct list_head
*head
= &bitmap
->complete_pages
;
628 spin_lock(&bitmap
->write_lock
);
629 if (list_empty(head
))
631 item
= list_entry(head
->prev
, struct page_list
, list
);
632 list_del(head
->prev
);
634 spin_unlock(&bitmap
->write_lock
);
638 static void drain_write_queues(struct bitmap
*bitmap
)
640 struct page_list
*item
;
642 while ((item
= dequeue_page(bitmap
))) {
643 /* don't bother to wait */
644 page_cache_release(item
->page
);
645 mempool_free(item
, bitmap
->write_pool
);
648 wake_up(&bitmap
->write_wait
);
651 static void bitmap_file_put(struct bitmap
*bitmap
)
657 spin_lock_irqsave(&bitmap
->lock
, flags
);
660 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
662 bitmap_stop_daemons(bitmap
);
664 drain_write_queues(bitmap
);
666 bitmap_file_unmap(bitmap
);
669 inode
= file
->f_mapping
->host
;
670 spin_lock(&inode
->i_lock
);
671 atomic_set(&inode
->i_writecount
, 1); /* allow writes again */
672 spin_unlock(&inode
->i_lock
);
679 * bitmap_file_kick - if an error occurs while manipulating the bitmap file
680 * then it is no longer reliable, so we stop using it and we mark the file
681 * as failed in the superblock
683 static void bitmap_file_kick(struct bitmap
*bitmap
)
685 char *path
, *ptr
= NULL
;
687 bitmap_mask_state(bitmap
, BITMAP_STALE
, MASK_SET
);
688 bitmap_update_sb(bitmap
);
691 path
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
693 ptr
= file_path(bitmap
->file
, path
, PAGE_SIZE
);
695 printk(KERN_ALERT
"%s: kicking failed bitmap file %s from array!\n",
696 bmname(bitmap
), ptr
? ptr
: "");
701 bitmap_file_put(bitmap
);
706 enum bitmap_page_attr
{
707 BITMAP_PAGE_DIRTY
= 1, // there are set bits that need to be synced
708 BITMAP_PAGE_CLEAN
= 2, // there are bits that might need to be cleared
709 BITMAP_PAGE_NEEDWRITE
=4, // there are cleared bits that need to be synced
712 static inline void set_page_attr(struct bitmap
*bitmap
, struct page
*page
,
713 enum bitmap_page_attr attr
)
715 bitmap
->filemap_attr
[page
->index
] |= attr
;
718 static inline void clear_page_attr(struct bitmap
*bitmap
, struct page
*page
,
719 enum bitmap_page_attr attr
)
721 bitmap
->filemap_attr
[page
->index
] &= ~attr
;
724 static inline unsigned long get_page_attr(struct bitmap
*bitmap
, struct page
*page
)
726 return bitmap
->filemap_attr
[page
->index
];
730 * bitmap_file_set_bit -- called before performing a write to the md device
731 * to set (and eventually sync) a particular bit in the bitmap file
733 * we set the bit immediately, then we record the page number so that
734 * when an unplug occurs, we can flush the dirty pages out to disk
736 static void bitmap_file_set_bit(struct bitmap
*bitmap
, sector_t block
)
741 unsigned long chunk
= block
>> CHUNK_BLOCK_SHIFT(bitmap
);
743 if (!bitmap
->filemap
) {
747 page
= filemap_get_page(bitmap
, chunk
);
748 bit
= file_page_offset(chunk
);
751 /* make sure the page stays cached until it gets written out */
752 if (! (get_page_attr(bitmap
, page
) & BITMAP_PAGE_DIRTY
))
753 page_cache_get(page
);
756 kaddr
= kmap_atomic(page
, KM_USER0
);
758 kunmap_atomic(kaddr
, KM_USER0
);
759 PRINTK("set file bit %lu page %lu\n", bit
, page
->index
);
761 /* record page number so it gets flushed to disk when unplug occurs */
762 set_page_attr(bitmap
, page
, BITMAP_PAGE_DIRTY
);
766 /* this gets called when the md device is ready to unplug its underlying
767 * (slave) device queues -- before we let any writes go down, we need to
768 * sync the dirty pages of the bitmap file to disk */
769 int bitmap_unplug(struct bitmap
*bitmap
)
771 unsigned long i
, attr
, flags
;
779 /* look at each page to see if there are any set bits that need to be
780 * flushed out to disk */
781 for (i
= 0; i
< bitmap
->file_pages
; i
++) {
782 spin_lock_irqsave(&bitmap
->lock
, flags
);
783 if (!bitmap
->filemap
) {
784 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
787 page
= bitmap
->filemap
[i
];
788 attr
= get_page_attr(bitmap
, page
);
789 clear_page_attr(bitmap
, page
, BITMAP_PAGE_DIRTY
);
790 clear_page_attr(bitmap
, page
, BITMAP_PAGE_NEEDWRITE
);
791 if ((attr
& BITMAP_PAGE_DIRTY
))
793 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
795 if (attr
& (BITMAP_PAGE_DIRTY
| BITMAP_PAGE_NEEDWRITE
)) {
796 err
= write_page(bitmap
, page
, 0);
797 if (err
== -EAGAIN
) {
798 if (attr
& BITMAP_PAGE_DIRTY
)
799 err
= write_page(bitmap
, page
, 1);
807 if (wait
) { /* if any writes were performed, we need to wait on them */
809 spin_lock_irq(&bitmap
->write_lock
);
810 wait_event_lock_irq(bitmap
->write_wait
,
811 list_empty(&bitmap
->complete_pages
), bitmap
->write_lock
,
812 wake_up_process(bitmap
->writeback_daemon
->tsk
));
813 spin_unlock_irq(&bitmap
->write_lock
);
815 wait_event(bitmap
->mddev
->sb_wait
,
816 atomic_read(&bitmap
->mddev
->pending_writes
)==0);
821 static void bitmap_set_memory_bits(struct bitmap
*bitmap
, sector_t offset
,
822 unsigned long sectors
, int in_sync
);
823 /* * bitmap_init_from_disk -- called at bitmap_create time to initialize
824 * the in-memory bitmap from the on-disk bitmap -- also, sets up the
825 * memory mapping of the bitmap file
827 * if there's no bitmap file, or if the bitmap file had been
828 * previously kicked from the array, we mark all the bits as
829 * 1's in order to cause a full resync.
831 static int bitmap_init_from_disk(struct bitmap
*bitmap
, int in_sync
)
833 unsigned long i
, chunks
, index
, oldindex
, bit
;
834 struct page
*page
= NULL
, *oldpage
= NULL
;
835 unsigned long num_pages
, bit_cnt
= 0;
837 unsigned long bytes
, offset
, dummy
;
841 chunks
= bitmap
->chunks
;
844 BUG_ON(!file
&& !bitmap
->offset
);
846 #ifdef INJECT_FAULTS_3
849 outofdate
= bitmap
->flags
& BITMAP_STALE
;
852 printk(KERN_INFO
"%s: bitmap file is out of date, doing full "
853 "recovery\n", bmname(bitmap
));
855 bytes
= (chunks
+ 7) / 8;
857 num_pages
= (bytes
+ sizeof(bitmap_super_t
) + PAGE_SIZE
- 1) / PAGE_SIZE
;
859 if (file
&& i_size_read(file
->f_mapping
->host
) < bytes
+ sizeof(bitmap_super_t
)) {
860 printk(KERN_INFO
"%s: bitmap file too short %lu < %lu\n",
862 (unsigned long) i_size_read(file
->f_mapping
->host
),
863 bytes
+ sizeof(bitmap_super_t
));
869 bitmap
->filemap
= kmalloc(sizeof(struct page
*) * num_pages
, GFP_KERNEL
);
870 if (!bitmap
->filemap
)
873 bitmap
->filemap_attr
= kmalloc(sizeof(long) * num_pages
, GFP_KERNEL
);
874 if (!bitmap
->filemap_attr
)
877 memset(bitmap
->filemap_attr
, 0, sizeof(long) * num_pages
);
881 for (i
= 0; i
< chunks
; i
++) {
882 index
= file_page_index(i
);
883 bit
= file_page_offset(i
);
884 if (index
!= oldindex
) { /* this is a new page, read it in */
885 /* unmap the old page, we're done with it */
890 * if we're here then the superblock page
891 * contains some bits (PAGE_SIZE != sizeof sb)
892 * we've already read it in, so just use it
894 page
= bitmap
->sb_page
;
895 offset
= sizeof(bitmap_super_t
);
897 page
= read_page(file
, index
, &dummy
);
900 page
= read_sb_page(bitmap
->mddev
, bitmap
->offset
, index
);
903 if (IS_ERR(page
)) { /* read error */
914 * if bitmap is out of date, dirty the
915 * whole page and write it out
917 memset(page_address(page
) + offset
, 0xff,
919 ret
= write_page(bitmap
, page
, 1);
922 /* release, page not in filemap yet */
923 page_cache_release(page
);
928 bitmap
->filemap
[bitmap
->file_pages
++] = page
;
930 if (test_bit(bit
, page_address(page
))) {
931 /* if the disk bit is set, set the memory bit */
932 bitmap_set_memory_bits(bitmap
,
933 i
<< CHUNK_BLOCK_SHIFT(bitmap
), 1, in_sync
);
938 /* everything went OK */
940 bitmap_mask_state(bitmap
, BITMAP_STALE
, MASK_UNSET
);
942 if (page
) /* unmap the last page */
945 if (bit_cnt
) { /* Kick recovery if any bits were set */
946 set_bit(MD_RECOVERY_NEEDED
, &bitmap
->mddev
->recovery
);
947 md_wakeup_thread(bitmap
->mddev
->thread
);
951 printk(KERN_INFO
"%s: bitmap initialized from disk: "
952 "read %lu/%lu pages, set %lu bits, status: %d\n",
953 bmname(bitmap
), bitmap
->file_pages
, num_pages
, bit_cnt
, ret
);
958 void bitmap_write_all(struct bitmap
*bitmap
)
960 /* We don't actually write all bitmap blocks here,
961 * just flag them as needing to be written
964 unsigned long chunks
= bitmap
->chunks
;
965 unsigned long bytes
= (chunks
+7)/8 + sizeof(bitmap_super_t
);
966 unsigned long num_pages
= (bytes
+ PAGE_SIZE
-1) / PAGE_SIZE
;
968 bitmap
->filemap_attr
[num_pages
] |= BITMAP_PAGE_NEEDWRITE
;
972 static void bitmap_count_page(struct bitmap
*bitmap
, sector_t offset
, int inc
)
974 sector_t chunk
= offset
>> CHUNK_BLOCK_SHIFT(bitmap
);
975 unsigned long page
= chunk
>> PAGE_COUNTER_SHIFT
;
976 bitmap
->bp
[page
].count
+= inc
;
978 if (page == 0) printk("count page 0, offset %llu: %d gives %d\n",
979 (unsigned long long)offset, inc, bitmap->bp[page].count);
981 bitmap_checkfree(bitmap
, page
);
983 static bitmap_counter_t
*bitmap_get_counter(struct bitmap
*bitmap
,
984 sector_t offset
, int *blocks
,
988 * bitmap daemon -- periodically wakes up to clean bits and flush pages
992 int bitmap_daemon_work(struct bitmap
*bitmap
)
996 struct page
*page
= NULL
, *lastpage
= NULL
;
1003 if (time_before(jiffies
, bitmap
->daemon_lastrun
+ bitmap
->daemon_sleep
*HZ
))
1005 bitmap
->daemon_lastrun
= jiffies
;
1007 for (j
= 0; j
< bitmap
->chunks
; j
++) {
1008 bitmap_counter_t
*bmc
;
1009 spin_lock_irqsave(&bitmap
->lock
, flags
);
1010 if (!bitmap
->filemap
) {
1011 /* error or shutdown */
1012 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
1016 page
= filemap_get_page(bitmap
, j
);
1018 if (page
!= lastpage
) {
1019 /* skip this page unless it's marked as needing cleaning */
1020 if (!((attr
=get_page_attr(bitmap
, page
)) & BITMAP_PAGE_CLEAN
)) {
1021 if (attr
& BITMAP_PAGE_NEEDWRITE
) {
1022 page_cache_get(page
);
1023 clear_page_attr(bitmap
, page
, BITMAP_PAGE_NEEDWRITE
);
1025 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
1026 if (attr
& BITMAP_PAGE_NEEDWRITE
) {
1027 switch (write_page(bitmap
, page
, 0)) {
1029 set_page_attr(bitmap
, page
, BITMAP_PAGE_NEEDWRITE
);
1034 bitmap_file_kick(bitmap
);
1036 page_cache_release(page
);
1041 /* grab the new page, sync and release the old */
1042 page_cache_get(page
);
1043 if (lastpage
!= NULL
) {
1044 if (get_page_attr(bitmap
, lastpage
) & BITMAP_PAGE_NEEDWRITE
) {
1045 clear_page_attr(bitmap
, lastpage
, BITMAP_PAGE_NEEDWRITE
);
1046 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
1047 err
= write_page(bitmap
, lastpage
, 0);
1048 if (err
== -EAGAIN
) {
1050 set_page_attr(bitmap
, lastpage
, BITMAP_PAGE_NEEDWRITE
);
1053 set_page_attr(bitmap
, lastpage
, BITMAP_PAGE_NEEDWRITE
);
1054 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
1057 page_cache_release(lastpage
);
1059 bitmap_file_kick(bitmap
);
1061 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
1065 printk("bitmap clean at page %lu\n", j);
1067 spin_lock_irqsave(&bitmap
->lock
, flags
);
1068 clear_page_attr(bitmap
, page
, BITMAP_PAGE_CLEAN
);
1070 bmc
= bitmap_get_counter(bitmap
, j
<< CHUNK_BLOCK_SHIFT(bitmap
),
1074 if (j < 100) printk("bitmap: j=%lu, *bmc = 0x%x\n", j, *bmc);
1077 *bmc
=1; /* maybe clear the bit next time */
1078 set_page_attr(bitmap
, page
, BITMAP_PAGE_CLEAN
);
1079 } else if (*bmc
== 1) {
1080 /* we can clear the bit */
1082 bitmap_count_page(bitmap
, j
<< CHUNK_BLOCK_SHIFT(bitmap
),
1086 clear_bit(file_page_offset(j
), page_address(page
));
1089 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
1092 /* now sync the final page */
1093 if (lastpage
!= NULL
) {
1095 spin_lock_irqsave(&bitmap
->lock
, flags
);
1096 if (get_page_attr(bitmap
, lastpage
) &BITMAP_PAGE_NEEDWRITE
) {
1097 clear_page_attr(bitmap
, lastpage
, BITMAP_PAGE_NEEDWRITE
);
1098 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
1099 err
= write_page(bitmap
, lastpage
, 0);
1100 if (err
== -EAGAIN
) {
1101 set_page_attr(bitmap
, lastpage
, BITMAP_PAGE_NEEDWRITE
);
1105 set_page_attr(bitmap
, lastpage
, BITMAP_PAGE_NEEDWRITE
);
1106 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
1109 page_cache_release(lastpage
);
1115 static void daemon_exit(struct bitmap
*bitmap
, mdk_thread_t
**daemon
)
1118 unsigned long flags
;
1120 /* if no one is waiting on us, we'll free the md thread struct
1121 * and exit, otherwise we let the waiter clean things up */
1122 spin_lock_irqsave(&bitmap
->lock
, flags
);
1123 if ((dmn
= *daemon
)) { /* no one is waiting, cleanup and exit */
1125 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
1127 complete_and_exit(NULL
, 0); /* do_exit not exported */
1129 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
1132 static void bitmap_writeback_daemon(mddev_t
*mddev
)
1134 struct bitmap
*bitmap
= mddev
->bitmap
;
1136 struct page_list
*item
;
1139 if (signal_pending(current
)) {
1141 "%s: bitmap writeback daemon got signal, exiting...\n",
1147 PRINTK("%s: bitmap writeback daemon woke up...\n", bmname(bitmap
));
1148 /* wait on bitmap page writebacks */
1149 while ((item
= dequeue_page(bitmap
))) {
1151 mempool_free(item
, bitmap
->write_pool
);
1152 PRINTK("wait on page writeback: %p\n", page
);
1153 wait_on_page_writeback(page
);
1154 PRINTK("finished page writeback: %p\n", page
);
1156 err
= PageError(page
);
1157 page_cache_release(page
);
1159 printk(KERN_WARNING
"%s: bitmap file writeback "
1160 "failed (page %lu): %d\n",
1161 bmname(bitmap
), page
->index
, err
);
1162 bitmap_file_kick(bitmap
);
1167 wake_up(&bitmap
->write_wait
);
1169 printk(KERN_INFO
"%s: bitmap writeback daemon exiting (%d)\n",
1170 bmname(bitmap
), err
);
1171 daemon_exit(bitmap
, &bitmap
->writeback_daemon
);
1175 static int bitmap_start_daemon(struct bitmap
*bitmap
, mdk_thread_t
**ptr
,
1176 void (*func
)(mddev_t
*), char *name
)
1178 mdk_thread_t
*daemon
;
1179 unsigned long flags
;
1182 spin_lock_irqsave(&bitmap
->lock
, flags
);
1185 if (!bitmap
->file
) /* no need for daemon if there's no backing file */
1188 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
1190 #ifdef INJECT_FATAL_FAULT_2
1193 sprintf(namebuf
, "%%s_%s", name
);
1194 daemon
= md_register_thread(func
, bitmap
->mddev
, namebuf
);
1197 printk(KERN_ERR
"%s: failed to start bitmap daemon\n",
1202 spin_lock_irqsave(&bitmap
->lock
, flags
);
1205 md_wakeup_thread(daemon
); /* start it running */
1207 PRINTK("%s: %s daemon (pid %d) started...\n",
1208 bmname(bitmap
), name
, daemon
->tsk
->pid
);
1210 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
1214 static int bitmap_start_daemons(struct bitmap
*bitmap
)
1216 int err
= bitmap_start_daemon(bitmap
, &bitmap
->writeback_daemon
,
1217 bitmap_writeback_daemon
, "bitmap_wb");
1221 static void bitmap_stop_daemon(struct bitmap
*bitmap
, mdk_thread_t
**ptr
)
1223 mdk_thread_t
*daemon
;
1224 unsigned long flags
;
1226 spin_lock_irqsave(&bitmap
->lock
, flags
);
1229 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
1231 md_unregister_thread(daemon
); /* destroy the thread */
1234 static void bitmap_stop_daemons(struct bitmap
*bitmap
)
1236 /* the daemons can't stop themselves... they'll just exit instead... */
1237 if (bitmap
->writeback_daemon
&&
1238 current
->pid
!= bitmap
->writeback_daemon
->tsk
->pid
)
1239 bitmap_stop_daemon(bitmap
, &bitmap
->writeback_daemon
);
1242 static bitmap_counter_t
*bitmap_get_counter(struct bitmap
*bitmap
,
1243 sector_t offset
, int *blocks
,
1246 /* If 'create', we might release the lock and reclaim it.
1247 * The lock must have been taken with interrupts enabled.
1248 * If !create, we don't release the lock.
1250 sector_t chunk
= offset
>> CHUNK_BLOCK_SHIFT(bitmap
);
1251 unsigned long page
= chunk
>> PAGE_COUNTER_SHIFT
;
1252 unsigned long pageoff
= (chunk
& PAGE_COUNTER_MASK
) << COUNTER_BYTE_SHIFT
;
1255 if (bitmap_checkpage(bitmap
, page
, create
) < 0) {
1256 csize
= ((sector_t
)1) << (CHUNK_BLOCK_SHIFT(bitmap
));
1257 *blocks
= csize
- (offset
& (csize
- 1));
1260 /* now locked ... */
1262 if (bitmap
->bp
[page
].hijacked
) { /* hijacked pointer */
1263 /* should we use the first or second counter field
1264 * of the hijacked pointer? */
1265 int hi
= (pageoff
> PAGE_COUNTER_MASK
);
1266 csize
= ((sector_t
)1) << (CHUNK_BLOCK_SHIFT(bitmap
) +
1267 PAGE_COUNTER_SHIFT
- 1);
1268 *blocks
= csize
- (offset
& (csize
- 1));
1269 return &((bitmap_counter_t
*)
1270 &bitmap
->bp
[page
].map
)[hi
];
1271 } else { /* page is allocated */
1272 csize
= ((sector_t
)1) << (CHUNK_BLOCK_SHIFT(bitmap
));
1273 *blocks
= csize
- (offset
& (csize
- 1));
1274 return (bitmap_counter_t
*)
1275 &(bitmap
->bp
[page
].map
[pageoff
]);
1279 int bitmap_startwrite(struct bitmap
*bitmap
, sector_t offset
, unsigned long sectors
)
1281 if (!bitmap
) return 0;
1284 bitmap_counter_t
*bmc
;
1286 spin_lock_irq(&bitmap
->lock
);
1287 bmc
= bitmap_get_counter(bitmap
, offset
, &blocks
, 1);
1289 spin_unlock_irq(&bitmap
->lock
);
1295 bitmap_file_set_bit(bitmap
, offset
);
1296 bitmap_count_page(bitmap
,offset
, 1);
1297 blk_plug_device(bitmap
->mddev
->queue
);
1302 if ((*bmc
& COUNTER_MAX
) == COUNTER_MAX
) BUG();
1305 spin_unlock_irq(&bitmap
->lock
);
1308 if (sectors
> blocks
)
1315 void bitmap_endwrite(struct bitmap
*bitmap
, sector_t offset
, unsigned long sectors
,
1318 if (!bitmap
) return;
1321 unsigned long flags
;
1322 bitmap_counter_t
*bmc
;
1324 spin_lock_irqsave(&bitmap
->lock
, flags
);
1325 bmc
= bitmap_get_counter(bitmap
, offset
, &blocks
, 0);
1327 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
1331 if (!success
&& ! (*bmc
& NEEDED_MASK
))
1332 *bmc
|= NEEDED_MASK
;
1336 set_page_attr(bitmap
,
1337 filemap_get_page(bitmap
, offset
>> CHUNK_BLOCK_SHIFT(bitmap
)),
1340 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
1342 if (sectors
> blocks
)
1348 int bitmap_start_sync(struct bitmap
*bitmap
, sector_t offset
, int *blocks
,
1351 bitmap_counter_t
*bmc
;
1353 if (bitmap
== NULL
) {/* FIXME or bitmap set as 'failed' */
1355 return 1; /* always resync if no bitmap */
1357 spin_lock_irq(&bitmap
->lock
);
1358 bmc
= bitmap_get_counter(bitmap
, offset
, blocks
, 0);
1364 else if (NEEDED(*bmc
)) {
1366 if (!degraded
) { /* don't set/clear bits if degraded */
1367 *bmc
|= RESYNC_MASK
;
1368 *bmc
&= ~NEEDED_MASK
;
1372 spin_unlock_irq(&bitmap
->lock
);
1376 void bitmap_end_sync(struct bitmap
*bitmap
, sector_t offset
, int *blocks
, int aborted
)
1378 bitmap_counter_t
*bmc
;
1379 unsigned long flags
;
1381 if (offset == 0) printk("bitmap_end_sync 0 (%d)\n", aborted);
1382 */ if (bitmap
== NULL
) {
1386 spin_lock_irqsave(&bitmap
->lock
, flags
);
1387 bmc
= bitmap_get_counter(bitmap
, offset
, blocks
, 0);
1392 if (offset == 0) printk("bitmap_end sync found 0x%x, blocks %d\n", *bmc, *blocks);
1395 *bmc
&= ~RESYNC_MASK
;
1397 if (!NEEDED(*bmc
) && aborted
)
1398 *bmc
|= NEEDED_MASK
;
1401 set_page_attr(bitmap
,
1402 filemap_get_page(bitmap
, offset
>> CHUNK_BLOCK_SHIFT(bitmap
)),
1408 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
1411 void bitmap_close_sync(struct bitmap
*bitmap
)
1413 /* Sync has finished, and any bitmap chunks that weren't synced
1414 * properly have been aborted. It remains to us to clear the
1415 * RESYNC bit wherever it is still on
1417 sector_t sector
= 0;
1419 if (!bitmap
) return;
1420 while (sector
< bitmap
->mddev
->resync_max_sectors
) {
1421 bitmap_end_sync(bitmap
, sector
, &blocks
, 0);
1423 if (sector < 500) printk("bitmap_close_sync: sec %llu blks %d\n",
1424 (unsigned long long)sector, blocks);
1425 */ sector
+= blocks
;
1429 static void bitmap_set_memory_bits(struct bitmap
*bitmap
, sector_t offset
,
1430 unsigned long sectors
, int in_sync
)
1432 /* For each chunk covered by any of these sectors, set the
1433 * counter to 1 and set resync_needed unless in_sync. They should all
1434 * be 0 at this point
1438 bitmap_counter_t
*bmc
;
1439 spin_lock_irq(&bitmap
->lock
);
1440 bmc
= bitmap_get_counter(bitmap
, offset
, &secs
, 1);
1442 spin_unlock_irq(&bitmap
->lock
);
1447 *bmc
= 1 | (in_sync
? 0 : NEEDED_MASK
);
1448 bitmap_count_page(bitmap
, offset
, 1);
1449 page
= filemap_get_page(bitmap
, offset
>> CHUNK_BLOCK_SHIFT(bitmap
));
1450 set_page_attr(bitmap
, page
, BITMAP_PAGE_CLEAN
);
1452 spin_unlock_irq(&bitmap
->lock
);
1461 * free memory that was allocated
1463 void bitmap_destroy(mddev_t
*mddev
)
1465 unsigned long k
, pages
;
1466 struct bitmap_page
*bp
;
1467 struct bitmap
*bitmap
= mddev
->bitmap
;
1469 if (!bitmap
) /* there was no bitmap */
1472 mddev
->bitmap
= NULL
; /* disconnect from the md device */
1474 /* release the bitmap file and kill the daemon */
1475 bitmap_file_put(bitmap
);
1478 pages
= bitmap
->pages
;
1480 /* free all allocated memory */
1482 mempool_destroy(bitmap
->write_pool
);
1484 if (bp
) /* deallocate the page memory */
1485 for (k
= 0; k
< pages
; k
++)
1486 if (bp
[k
].map
&& !bp
[k
].hijacked
)
1493 * initialize the bitmap structure
1494 * if this returns an error, bitmap_destroy must be called to do clean up
1496 int bitmap_create(mddev_t
*mddev
)
1498 struct bitmap
*bitmap
;
1499 unsigned long blocks
= mddev
->resync_max_sectors
;
1500 unsigned long chunks
;
1501 unsigned long pages
;
1502 struct file
*file
= mddev
->bitmap_file
;
1505 BUG_ON(sizeof(bitmap_super_t
) != 256);
1507 if (!file
&& !mddev
->bitmap_offset
) /* bitmap disabled, nothing to do */
1510 BUG_ON(file
&& mddev
->bitmap_offset
);
1512 bitmap
= kmalloc(sizeof(*bitmap
), GFP_KERNEL
);
1516 memset(bitmap
, 0, sizeof(*bitmap
));
1518 spin_lock_init(&bitmap
->lock
);
1519 bitmap
->mddev
= mddev
;
1520 mddev
->bitmap
= bitmap
;
1522 spin_lock_init(&bitmap
->write_lock
);
1523 INIT_LIST_HEAD(&bitmap
->complete_pages
);
1524 init_waitqueue_head(&bitmap
->write_wait
);
1525 bitmap
->write_pool
= mempool_create(WRITE_POOL_SIZE
, write_pool_alloc
,
1526 write_pool_free
, NULL
);
1527 if (!bitmap
->write_pool
)
1530 bitmap
->file
= file
;
1531 bitmap
->offset
= mddev
->bitmap_offset
;
1532 if (file
) get_file(file
);
1533 /* read superblock from bitmap file (this sets bitmap->chunksize) */
1534 err
= bitmap_read_sb(bitmap
);
1538 bitmap
->chunkshift
= find_first_bit(&bitmap
->chunksize
,
1539 sizeof(bitmap
->chunksize
));
1541 /* now that chunksize and chunkshift are set, we can use these macros */
1542 chunks
= (blocks
+ CHUNK_BLOCK_RATIO(bitmap
) - 1) /
1543 CHUNK_BLOCK_RATIO(bitmap
);
1544 pages
= (chunks
+ PAGE_COUNTER_RATIO
- 1) / PAGE_COUNTER_RATIO
;
1548 bitmap
->chunks
= chunks
;
1549 bitmap
->pages
= pages
;
1550 bitmap
->missing_pages
= pages
;
1551 bitmap
->counter_bits
= COUNTER_BITS
;
1553 bitmap
->syncchunk
= ~0UL;
1555 #ifdef INJECT_FATAL_FAULT_1
1558 bitmap
->bp
= kmalloc(pages
* sizeof(*bitmap
->bp
), GFP_KERNEL
);
1562 memset(bitmap
->bp
, 0, pages
* sizeof(*bitmap
->bp
));
1564 bitmap
->flags
|= BITMAP_ACTIVE
;
1566 /* now that we have some pages available, initialize the in-memory
1567 * bitmap from the on-disk bitmap */
1568 err
= bitmap_init_from_disk(bitmap
, mddev
->recovery_cp
== MaxSector
);
1572 printk(KERN_INFO
"created bitmap (%lu pages) for device %s\n",
1573 pages
, bmname(bitmap
));
1575 /* kick off the bitmap daemons */
1576 err
= bitmap_start_daemons(bitmap
);
1579 return bitmap_update_sb(bitmap
);
1582 /* the bitmap API -- for raid personalities */
1583 EXPORT_SYMBOL(bitmap_startwrite
);
1584 EXPORT_SYMBOL(bitmap_endwrite
);
1585 EXPORT_SYMBOL(bitmap_start_sync
);
1586 EXPORT_SYMBOL(bitmap_end_sync
);
1587 EXPORT_SYMBOL(bitmap_unplug
);
1588 EXPORT_SYMBOL(bitmap_close_sync
);
1589 EXPORT_SYMBOL(bitmap_daemon_work
);
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