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).
16 * wait if count gets too high, wake when it drops to half.
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/raid/md.h>
30 #include <linux/raid/bitmap.h>
37 /* these are for debugging purposes only! */
39 /* define one and only one of these */
40 #define INJECT_FAULTS_1 0 /* cause bitmap_alloc_page to fail always */
41 #define INJECT_FAULTS_2 0 /* cause bitmap file to be kicked when first bit set*/
42 #define INJECT_FAULTS_3 0 /* treat bitmap file as kicked at init time */
43 #define INJECT_FAULTS_4 0 /* undef */
44 #define INJECT_FAULTS_5 0 /* undef */
45 #define INJECT_FAULTS_6 0
47 /* if these are defined, the driver will fail! debug only */
48 #define INJECT_FATAL_FAULT_1 0 /* fail kmalloc, causing bitmap_create to fail */
49 #define INJECT_FATAL_FAULT_2 0 /* undef */
50 #define INJECT_FATAL_FAULT_3 0 /* undef */
53 //#define DPRINTK PRINTK /* set this NULL to avoid verbose debug output */
54 #define DPRINTK(x...) do { } while(0)
58 # define PRINTK(x...) printk(KERN_DEBUG x)
64 static inline char * bmname(struct bitmap
*bitmap
)
66 return bitmap
->mddev
? mdname(bitmap
->mddev
) : "mdX";
71 * just a placeholder - calls kmalloc for bitmap pages
73 static unsigned char *bitmap_alloc_page(struct bitmap
*bitmap
)
77 #ifdef INJECT_FAULTS_1
80 page
= kmalloc(PAGE_SIZE
, GFP_NOIO
);
83 printk("%s: bitmap_alloc_page FAILED\n", bmname(bitmap
));
85 PRINTK("%s: bitmap_alloc_page: allocated page at %p\n",
86 bmname(bitmap
), page
);
91 * for now just a placeholder -- just calls kfree for bitmap pages
93 static void bitmap_free_page(struct bitmap
*bitmap
, unsigned char *page
)
95 PRINTK("%s: bitmap_free_page: free page %p\n", bmname(bitmap
), page
);
100 * check a page and, if necessary, allocate it (or hijack it if the alloc fails)
102 * 1) check to see if this page is allocated, if it's not then try to alloc
103 * 2) if the alloc fails, set the page's hijacked flag so we'll use the
104 * page pointer directly as a counter
106 * if we find our page, we increment the page's refcount so that it stays
107 * allocated while we're using it
109 static int bitmap_checkpage(struct bitmap
*bitmap
, unsigned long page
, int create
)
111 unsigned char *mappage
;
113 if (page
>= bitmap
->pages
) {
115 "%s: invalid bitmap page request: %lu (> %lu)\n",
116 bmname(bitmap
), page
, bitmap
->pages
-1);
121 if (bitmap
->bp
[page
].hijacked
) /* it's hijacked, don't try to alloc */
124 if (bitmap
->bp
[page
].map
) /* page is already allocated, just return */
130 spin_unlock_irq(&bitmap
->lock
);
132 /* this page has not been allocated yet */
134 if ((mappage
= bitmap_alloc_page(bitmap
)) == NULL
) {
135 PRINTK("%s: bitmap map page allocation failed, hijacking\n",
137 /* failed - set the hijacked flag so that we can use the
138 * pointer as a counter */
139 spin_lock_irq(&bitmap
->lock
);
140 if (!bitmap
->bp
[page
].map
)
141 bitmap
->bp
[page
].hijacked
= 1;
147 spin_lock_irq(&bitmap
->lock
);
149 /* recheck the page */
151 if (bitmap
->bp
[page
].map
|| bitmap
->bp
[page
].hijacked
) {
152 /* somebody beat us to getting the page */
153 bitmap_free_page(bitmap
, mappage
);
157 /* no page was in place and we have one, so install it */
159 memset(mappage
, 0, PAGE_SIZE
);
160 bitmap
->bp
[page
].map
= mappage
;
161 bitmap
->missing_pages
--;
167 /* if page is completely empty, put it back on the free list, or dealloc it */
168 /* if page was hijacked, unmark the flag so it might get alloced next time */
169 /* Note: lock should be held when calling this */
170 static void bitmap_checkfree(struct bitmap
*bitmap
, unsigned long page
)
174 if (bitmap
->bp
[page
].count
) /* page is still busy */
177 /* page is no longer in use, it can be released */
179 if (bitmap
->bp
[page
].hijacked
) { /* page was hijacked, undo this now */
180 bitmap
->bp
[page
].hijacked
= 0;
181 bitmap
->bp
[page
].map
= NULL
;
185 /* normal case, free the page */
188 /* actually ... let's not. We will probably need the page again exactly when
189 * memory is tight and we are flusing to disk
193 ptr
= bitmap
->bp
[page
].map
;
194 bitmap
->bp
[page
].map
= NULL
;
195 bitmap
->missing_pages
++;
196 bitmap_free_page(bitmap
, ptr
);
203 * bitmap file handling - read and write the bitmap file and its superblock
207 * basic page I/O operations
210 /* IO operations when bitmap is stored near all superblocks */
211 static struct page
*read_sb_page(mddev_t
*mddev
, long offset
, unsigned long index
)
213 /* choose a good rdev and read the page from there */
216 struct list_head
*tmp
;
217 struct page
*page
= alloc_page(GFP_KERNEL
);
221 return ERR_PTR(-ENOMEM
);
223 rdev_for_each(rdev
, tmp
, mddev
) {
224 if (! test_bit(In_sync
, &rdev
->flags
)
225 || test_bit(Faulty
, &rdev
->flags
))
228 target
= rdev
->sb_start
+ offset
+ index
* (PAGE_SIZE
/512);
230 if (sync_page_io(rdev
->bdev
, target
, PAGE_SIZE
, page
, READ
)) {
232 attach_page_buffers(page
, NULL
); /* so that free_buffer will
237 return ERR_PTR(-EIO
);
241 static int write_sb_page(struct bitmap
*bitmap
, struct page
*page
, int wait
)
244 mddev_t
*mddev
= bitmap
->mddev
;
247 rdev_for_each_rcu(rdev
, mddev
)
248 if (test_bit(In_sync
, &rdev
->flags
)
249 && !test_bit(Faulty
, &rdev
->flags
)) {
250 int size
= PAGE_SIZE
;
251 if (page
->index
== bitmap
->file_pages
-1)
252 size
= roundup(bitmap
->last_page_size
,
253 bdev_hardsect_size(rdev
->bdev
));
254 /* Just make sure we aren't corrupting data or
257 if (bitmap
->offset
< 0) {
258 /* DATA BITMAP METADATA */
260 + (long)(page
->index
* (PAGE_SIZE
/512))
262 /* bitmap runs in to metadata */
264 if (rdev
->data_offset
+ mddev
->size
*2
265 > rdev
->sb_start
+ bitmap
->offset
)
266 /* data runs in to bitmap */
268 } else if (rdev
->sb_start
< rdev
->data_offset
) {
269 /* METADATA BITMAP DATA */
272 + page
->index
*(PAGE_SIZE
/512) + size
/512
274 /* bitmap runs in to data */
277 /* DATA METADATA BITMAP - no problems */
279 md_super_write(mddev
, rdev
,
280 rdev
->sb_start
+ bitmap
->offset
281 + page
->index
* (PAGE_SIZE
/512),
288 md_super_wait(mddev
);
296 static void bitmap_file_kick(struct bitmap
*bitmap
);
298 * write out a page to a file
300 static void write_page(struct bitmap
*bitmap
, struct page
*page
, int wait
)
302 struct buffer_head
*bh
;
304 if (bitmap
->file
== NULL
) {
305 switch (write_sb_page(bitmap
, page
, wait
)) {
307 bitmap
->flags
|= BITMAP_WRITE_ERROR
;
311 bh
= page_buffers(page
);
313 while (bh
&& bh
->b_blocknr
) {
314 atomic_inc(&bitmap
->pending_writes
);
315 set_buffer_locked(bh
);
316 set_buffer_mapped(bh
);
317 submit_bh(WRITE
, bh
);
318 bh
= bh
->b_this_page
;
322 wait_event(bitmap
->write_wait
,
323 atomic_read(&bitmap
->pending_writes
)==0);
326 if (bitmap
->flags
& BITMAP_WRITE_ERROR
)
327 bitmap_file_kick(bitmap
);
330 static void end_bitmap_write(struct buffer_head
*bh
, int uptodate
)
332 struct bitmap
*bitmap
= bh
->b_private
;
336 spin_lock_irqsave(&bitmap
->lock
, flags
);
337 bitmap
->flags
|= BITMAP_WRITE_ERROR
;
338 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
340 if (atomic_dec_and_test(&bitmap
->pending_writes
))
341 wake_up(&bitmap
->write_wait
);
344 /* copied from buffer.c */
346 __clear_page_buffers(struct page
*page
)
348 ClearPagePrivate(page
);
349 set_page_private(page
, 0);
350 page_cache_release(page
);
352 static void free_buffers(struct page
*page
)
354 struct buffer_head
*bh
= page_buffers(page
);
357 struct buffer_head
*next
= bh
->b_this_page
;
358 free_buffer_head(bh
);
361 __clear_page_buffers(page
);
365 /* read a page from a file.
366 * We both read the page, and attach buffers to the page to record the
367 * address of each block (using bmap). These addresses will be used
368 * to write the block later, completely bypassing the filesystem.
369 * This usage is similar to how swap files are handled, and allows us
370 * to write to a file with no concerns of memory allocation failing.
372 static struct page
*read_page(struct file
*file
, unsigned long index
,
373 struct bitmap
*bitmap
,
376 struct page
*page
= NULL
;
377 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
378 struct buffer_head
*bh
;
381 PRINTK("read bitmap file (%dB @ %Lu)\n", (int)PAGE_SIZE
,
382 (unsigned long long)index
<< PAGE_SHIFT
);
384 page
= alloc_page(GFP_KERNEL
);
386 page
= ERR_PTR(-ENOMEM
);
390 bh
= alloc_page_buffers(page
, 1<<inode
->i_blkbits
, 0);
393 page
= ERR_PTR(-ENOMEM
);
396 attach_page_buffers(page
, bh
);
397 block
= index
<< (PAGE_SHIFT
- inode
->i_blkbits
);
402 bh
->b_blocknr
= bmap(inode
, block
);
403 if (bh
->b_blocknr
== 0) {
404 /* Cannot use this file! */
406 page
= ERR_PTR(-EINVAL
);
409 bh
->b_bdev
= inode
->i_sb
->s_bdev
;
410 if (count
< (1<<inode
->i_blkbits
))
413 count
-= (1<<inode
->i_blkbits
);
415 bh
->b_end_io
= end_bitmap_write
;
416 bh
->b_private
= bitmap
;
417 atomic_inc(&bitmap
->pending_writes
);
418 set_buffer_locked(bh
);
419 set_buffer_mapped(bh
);
423 bh
= bh
->b_this_page
;
427 wait_event(bitmap
->write_wait
,
428 atomic_read(&bitmap
->pending_writes
)==0);
429 if (bitmap
->flags
& BITMAP_WRITE_ERROR
) {
431 page
= ERR_PTR(-EIO
);
435 printk(KERN_ALERT
"md: bitmap read error: (%dB @ %Lu): %ld\n",
437 (unsigned long long)index
<< PAGE_SHIFT
,
443 * bitmap file superblock operations
446 /* update the event counter and sync the superblock to disk */
447 void bitmap_update_sb(struct bitmap
*bitmap
)
452 if (!bitmap
|| !bitmap
->mddev
) /* no bitmap for this array */
454 spin_lock_irqsave(&bitmap
->lock
, flags
);
455 if (!bitmap
->sb_page
) { /* no superblock */
456 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
459 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
460 sb
= (bitmap_super_t
*)kmap_atomic(bitmap
->sb_page
, KM_USER0
);
461 sb
->events
= cpu_to_le64(bitmap
->mddev
->events
);
462 if (bitmap
->mddev
->events
< bitmap
->events_cleared
) {
463 /* rocking back to read-only */
464 bitmap
->events_cleared
= bitmap
->mddev
->events
;
465 sb
->events_cleared
= cpu_to_le64(bitmap
->events_cleared
);
467 kunmap_atomic(sb
, KM_USER0
);
468 write_page(bitmap
, bitmap
->sb_page
, 1);
471 /* print out the bitmap file superblock */
472 void bitmap_print_sb(struct bitmap
*bitmap
)
476 if (!bitmap
|| !bitmap
->sb_page
)
478 sb
= (bitmap_super_t
*)kmap_atomic(bitmap
->sb_page
, KM_USER0
);
479 printk(KERN_DEBUG
"%s: bitmap file superblock:\n", bmname(bitmap
));
480 printk(KERN_DEBUG
" magic: %08x\n", le32_to_cpu(sb
->magic
));
481 printk(KERN_DEBUG
" version: %d\n", le32_to_cpu(sb
->version
));
482 printk(KERN_DEBUG
" uuid: %08x.%08x.%08x.%08x\n",
483 *(__u32
*)(sb
->uuid
+0),
484 *(__u32
*)(sb
->uuid
+4),
485 *(__u32
*)(sb
->uuid
+8),
486 *(__u32
*)(sb
->uuid
+12));
487 printk(KERN_DEBUG
" events: %llu\n",
488 (unsigned long long) le64_to_cpu(sb
->events
));
489 printk(KERN_DEBUG
"events cleared: %llu\n",
490 (unsigned long long) le64_to_cpu(sb
->events_cleared
));
491 printk(KERN_DEBUG
" state: %08x\n", le32_to_cpu(sb
->state
));
492 printk(KERN_DEBUG
" chunksize: %d B\n", le32_to_cpu(sb
->chunksize
));
493 printk(KERN_DEBUG
" daemon sleep: %ds\n", le32_to_cpu(sb
->daemon_sleep
));
494 printk(KERN_DEBUG
" sync size: %llu KB\n",
495 (unsigned long long)le64_to_cpu(sb
->sync_size
)/2);
496 printk(KERN_DEBUG
"max write behind: %d\n", le32_to_cpu(sb
->write_behind
));
497 kunmap_atomic(sb
, KM_USER0
);
500 /* read the superblock from the bitmap file and initialize some bitmap fields */
501 static int bitmap_read_sb(struct bitmap
*bitmap
)
505 unsigned long chunksize
, daemon_sleep
, write_behind
;
506 unsigned long long events
;
509 /* page 0 is the superblock, read it... */
511 loff_t isize
= i_size_read(bitmap
->file
->f_mapping
->host
);
512 int bytes
= isize
> PAGE_SIZE
? PAGE_SIZE
: isize
;
514 bitmap
->sb_page
= read_page(bitmap
->file
, 0, bitmap
, bytes
);
516 bitmap
->sb_page
= read_sb_page(bitmap
->mddev
, bitmap
->offset
, 0);
518 if (IS_ERR(bitmap
->sb_page
)) {
519 err
= PTR_ERR(bitmap
->sb_page
);
520 bitmap
->sb_page
= NULL
;
524 sb
= (bitmap_super_t
*)kmap_atomic(bitmap
->sb_page
, KM_USER0
);
526 chunksize
= le32_to_cpu(sb
->chunksize
);
527 daemon_sleep
= le32_to_cpu(sb
->daemon_sleep
);
528 write_behind
= le32_to_cpu(sb
->write_behind
);
530 /* verify that the bitmap-specific fields are valid */
531 if (sb
->magic
!= cpu_to_le32(BITMAP_MAGIC
))
532 reason
= "bad magic";
533 else if (le32_to_cpu(sb
->version
) < BITMAP_MAJOR_LO
||
534 le32_to_cpu(sb
->version
) > BITMAP_MAJOR_HI
)
535 reason
= "unrecognized superblock version";
536 else if (chunksize
< PAGE_SIZE
)
537 reason
= "bitmap chunksize too small";
538 else if ((1 << ffz(~chunksize
)) != chunksize
)
539 reason
= "bitmap chunksize not a power of 2";
540 else if (daemon_sleep
< 1 || daemon_sleep
> MAX_SCHEDULE_TIMEOUT
/ HZ
)
541 reason
= "daemon sleep period out of range";
542 else if (write_behind
> COUNTER_MAX
)
543 reason
= "write-behind limit out of range (0 - 16383)";
545 printk(KERN_INFO
"%s: invalid bitmap file superblock: %s\n",
546 bmname(bitmap
), reason
);
550 /* keep the array size field of the bitmap superblock up to date */
551 sb
->sync_size
= cpu_to_le64(bitmap
->mddev
->resync_max_sectors
);
553 if (!bitmap
->mddev
->persistent
)
557 * if we have a persistent array superblock, compare the
558 * bitmap's UUID and event counter to the mddev's
560 if (memcmp(sb
->uuid
, bitmap
->mddev
->uuid
, 16)) {
561 printk(KERN_INFO
"%s: bitmap superblock UUID mismatch\n",
565 events
= le64_to_cpu(sb
->events
);
566 if (events
< bitmap
->mddev
->events
) {
567 printk(KERN_INFO
"%s: bitmap file is out of date (%llu < %llu) "
568 "-- forcing full recovery\n", bmname(bitmap
), events
,
569 (unsigned long long) bitmap
->mddev
->events
);
570 sb
->state
|= cpu_to_le32(BITMAP_STALE
);
573 /* assign fields using values from superblock */
574 bitmap
->chunksize
= chunksize
;
575 bitmap
->daemon_sleep
= daemon_sleep
;
576 bitmap
->daemon_lastrun
= jiffies
;
577 bitmap
->max_write_behind
= write_behind
;
578 bitmap
->flags
|= le32_to_cpu(sb
->state
);
579 if (le32_to_cpu(sb
->version
) == BITMAP_MAJOR_HOSTENDIAN
)
580 bitmap
->flags
|= BITMAP_HOSTENDIAN
;
581 bitmap
->events_cleared
= le64_to_cpu(sb
->events_cleared
);
582 if (sb
->state
& cpu_to_le32(BITMAP_STALE
))
583 bitmap
->events_cleared
= bitmap
->mddev
->events
;
586 kunmap_atomic(sb
, KM_USER0
);
588 bitmap_print_sb(bitmap
);
592 enum bitmap_mask_op
{
597 /* record the state of the bitmap in the superblock. Return the old value */
598 static int bitmap_mask_state(struct bitmap
*bitmap
, enum bitmap_state bits
,
599 enum bitmap_mask_op op
)
605 spin_lock_irqsave(&bitmap
->lock
, flags
);
606 if (!bitmap
->sb_page
) { /* can't set the state */
607 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
610 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
611 sb
= (bitmap_super_t
*)kmap_atomic(bitmap
->sb_page
, KM_USER0
);
612 old
= le32_to_cpu(sb
->state
) & bits
;
614 case MASK_SET
: sb
->state
|= cpu_to_le32(bits
);
616 case MASK_UNSET
: sb
->state
&= cpu_to_le32(~bits
);
620 kunmap_atomic(sb
, KM_USER0
);
625 * general bitmap file operations
628 /* calculate the index of the page that contains this bit */
629 static inline unsigned long file_page_index(unsigned long chunk
)
631 return CHUNK_BIT_OFFSET(chunk
) >> PAGE_BIT_SHIFT
;
634 /* calculate the (bit) offset of this bit within a page */
635 static inline unsigned long file_page_offset(unsigned long chunk
)
637 return CHUNK_BIT_OFFSET(chunk
) & (PAGE_BITS
- 1);
641 * return a pointer to the page in the filemap that contains the given bit
643 * this lookup is complicated by the fact that the bitmap sb might be exactly
644 * 1 page (e.g., x86) or less than 1 page -- so the bitmap might start on page
647 static inline struct page
*filemap_get_page(struct bitmap
*bitmap
,
650 if (file_page_index(chunk
) >= bitmap
->file_pages
) return NULL
;
651 return bitmap
->filemap
[file_page_index(chunk
) - file_page_index(0)];
655 static void bitmap_file_unmap(struct bitmap
*bitmap
)
657 struct page
**map
, *sb_page
;
662 spin_lock_irqsave(&bitmap
->lock
, flags
);
663 map
= bitmap
->filemap
;
664 bitmap
->filemap
= NULL
;
665 attr
= bitmap
->filemap_attr
;
666 bitmap
->filemap_attr
= NULL
;
667 pages
= bitmap
->file_pages
;
668 bitmap
->file_pages
= 0;
669 sb_page
= bitmap
->sb_page
;
670 bitmap
->sb_page
= NULL
;
671 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
674 if (map
[pages
]->index
!= 0) /* 0 is sb_page, release it below */
675 free_buffers(map
[pages
]);
680 free_buffers(sb_page
);
683 static void bitmap_file_put(struct bitmap
*bitmap
)
688 spin_lock_irqsave(&bitmap
->lock
, flags
);
691 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
694 wait_event(bitmap
->write_wait
,
695 atomic_read(&bitmap
->pending_writes
)==0);
696 bitmap_file_unmap(bitmap
);
699 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
700 invalidate_mapping_pages(inode
->i_mapping
, 0, -1);
707 * bitmap_file_kick - if an error occurs while manipulating the bitmap file
708 * then it is no longer reliable, so we stop using it and we mark the file
709 * as failed in the superblock
711 static void bitmap_file_kick(struct bitmap
*bitmap
)
713 char *path
, *ptr
= NULL
;
715 if (bitmap_mask_state(bitmap
, BITMAP_STALE
, MASK_SET
) == 0) {
716 bitmap_update_sb(bitmap
);
719 path
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
721 ptr
= d_path(&bitmap
->file
->f_path
, path
,
726 "%s: kicking failed bitmap file %s from array!\n",
727 bmname(bitmap
), IS_ERR(ptr
) ? "" : ptr
);
732 "%s: disabling internal bitmap due to errors\n",
736 bitmap_file_put(bitmap
);
741 enum bitmap_page_attr
{
742 BITMAP_PAGE_DIRTY
= 0, // there are set bits that need to be synced
743 BITMAP_PAGE_CLEAN
= 1, // there are bits that might need to be cleared
744 BITMAP_PAGE_NEEDWRITE
=2, // there are cleared bits that need to be synced
747 static inline void set_page_attr(struct bitmap
*bitmap
, struct page
*page
,
748 enum bitmap_page_attr attr
)
750 __set_bit((page
->index
<<2) + attr
, bitmap
->filemap_attr
);
753 static inline void clear_page_attr(struct bitmap
*bitmap
, struct page
*page
,
754 enum bitmap_page_attr attr
)
756 __clear_bit((page
->index
<<2) + attr
, bitmap
->filemap_attr
);
759 static inline unsigned long test_page_attr(struct bitmap
*bitmap
, struct page
*page
,
760 enum bitmap_page_attr attr
)
762 return test_bit((page
->index
<<2) + attr
, bitmap
->filemap_attr
);
766 * bitmap_file_set_bit -- called before performing a write to the md device
767 * to set (and eventually sync) a particular bit in the bitmap file
769 * we set the bit immediately, then we record the page number so that
770 * when an unplug occurs, we can flush the dirty pages out to disk
772 static void bitmap_file_set_bit(struct bitmap
*bitmap
, sector_t block
)
777 unsigned long chunk
= block
>> CHUNK_BLOCK_SHIFT(bitmap
);
779 if (!bitmap
->filemap
) {
783 page
= filemap_get_page(bitmap
, chunk
);
785 bit
= file_page_offset(chunk
);
788 kaddr
= kmap_atomic(page
, KM_USER0
);
789 if (bitmap
->flags
& BITMAP_HOSTENDIAN
)
792 ext2_set_bit(bit
, kaddr
);
793 kunmap_atomic(kaddr
, KM_USER0
);
794 PRINTK("set file bit %lu page %lu\n", bit
, page
->index
);
796 /* record page number so it gets flushed to disk when unplug occurs */
797 set_page_attr(bitmap
, page
, BITMAP_PAGE_DIRTY
);
801 /* this gets called when the md device is ready to unplug its underlying
802 * (slave) device queues -- before we let any writes go down, we need to
803 * sync the dirty pages of the bitmap file to disk */
804 void bitmap_unplug(struct bitmap
*bitmap
)
806 unsigned long i
, flags
;
807 int dirty
, need_write
;
814 /* look at each page to see if there are any set bits that need to be
815 * flushed out to disk */
816 for (i
= 0; i
< bitmap
->file_pages
; i
++) {
817 spin_lock_irqsave(&bitmap
->lock
, flags
);
818 if (!bitmap
->filemap
) {
819 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
822 page
= bitmap
->filemap
[i
];
823 dirty
= test_page_attr(bitmap
, page
, BITMAP_PAGE_DIRTY
);
824 need_write
= test_page_attr(bitmap
, page
, BITMAP_PAGE_NEEDWRITE
);
825 clear_page_attr(bitmap
, page
, BITMAP_PAGE_DIRTY
);
826 clear_page_attr(bitmap
, page
, BITMAP_PAGE_NEEDWRITE
);
829 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
831 if (dirty
| need_write
)
832 write_page(bitmap
, page
, 0);
834 if (wait
) { /* if any writes were performed, we need to wait on them */
836 wait_event(bitmap
->write_wait
,
837 atomic_read(&bitmap
->pending_writes
)==0);
839 md_super_wait(bitmap
->mddev
);
841 if (bitmap
->flags
& BITMAP_WRITE_ERROR
)
842 bitmap_file_kick(bitmap
);
845 static void bitmap_set_memory_bits(struct bitmap
*bitmap
, sector_t offset
, int needed
);
846 /* * bitmap_init_from_disk -- called at bitmap_create time to initialize
847 * the in-memory bitmap from the on-disk bitmap -- also, sets up the
848 * memory mapping of the bitmap file
850 * if there's no bitmap file, or if the bitmap file had been
851 * previously kicked from the array, we mark all the bits as
852 * 1's in order to cause a full resync.
854 * We ignore all bits for sectors that end earlier than 'start'.
855 * This is used when reading an out-of-date bitmap...
857 static int bitmap_init_from_disk(struct bitmap
*bitmap
, sector_t start
)
859 unsigned long i
, chunks
, index
, oldindex
, bit
;
860 struct page
*page
= NULL
, *oldpage
= NULL
;
861 unsigned long num_pages
, bit_cnt
= 0;
863 unsigned long bytes
, offset
;
868 chunks
= bitmap
->chunks
;
871 BUG_ON(!file
&& !bitmap
->offset
);
873 #ifdef INJECT_FAULTS_3
876 outofdate
= bitmap
->flags
& BITMAP_STALE
;
879 printk(KERN_INFO
"%s: bitmap file is out of date, doing full "
880 "recovery\n", bmname(bitmap
));
882 bytes
= (chunks
+ 7) / 8;
884 num_pages
= (bytes
+ sizeof(bitmap_super_t
) + PAGE_SIZE
- 1) / PAGE_SIZE
;
886 if (file
&& i_size_read(file
->f_mapping
->host
) < bytes
+ sizeof(bitmap_super_t
)) {
887 printk(KERN_INFO
"%s: bitmap file too short %lu < %lu\n",
889 (unsigned long) i_size_read(file
->f_mapping
->host
),
890 bytes
+ sizeof(bitmap_super_t
));
896 bitmap
->filemap
= kmalloc(sizeof(struct page
*) * num_pages
, GFP_KERNEL
);
897 if (!bitmap
->filemap
)
900 /* We need 4 bits per page, rounded up to a multiple of sizeof(unsigned long) */
901 bitmap
->filemap_attr
= kzalloc(
902 roundup( DIV_ROUND_UP(num_pages
*4, 8), sizeof(unsigned long)),
904 if (!bitmap
->filemap_attr
)
909 for (i
= 0; i
< chunks
; i
++) {
911 index
= file_page_index(i
);
912 bit
= file_page_offset(i
);
913 if (index
!= oldindex
) { /* this is a new page, read it in */
915 /* unmap the old page, we're done with it */
916 if (index
== num_pages
-1)
917 count
= bytes
+ sizeof(bitmap_super_t
)
923 * if we're here then the superblock page
924 * contains some bits (PAGE_SIZE != sizeof sb)
925 * we've already read it in, so just use it
927 page
= bitmap
->sb_page
;
928 offset
= sizeof(bitmap_super_t
);
930 page
= read_page(file
, index
, bitmap
, count
);
933 page
= read_sb_page(bitmap
->mddev
, bitmap
->offset
, index
);
936 if (IS_ERR(page
)) { /* read error */
946 * if bitmap is out of date, dirty the
947 * whole page and write it out
949 paddr
= kmap_atomic(page
, KM_USER0
);
950 memset(paddr
+ offset
, 0xff,
952 kunmap_atomic(paddr
, KM_USER0
);
953 write_page(bitmap
, page
, 1);
956 if (bitmap
->flags
& BITMAP_WRITE_ERROR
) {
957 /* release, page not in filemap yet */
963 bitmap
->filemap
[bitmap
->file_pages
++] = page
;
964 bitmap
->last_page_size
= count
;
966 paddr
= kmap_atomic(page
, KM_USER0
);
967 if (bitmap
->flags
& BITMAP_HOSTENDIAN
)
968 b
= test_bit(bit
, paddr
);
970 b
= ext2_test_bit(bit
, paddr
);
971 kunmap_atomic(paddr
, KM_USER0
);
973 /* if the disk bit is set, set the memory bit */
974 bitmap_set_memory_bits(bitmap
, i
<< CHUNK_BLOCK_SHIFT(bitmap
),
975 ((i
+1) << (CHUNK_BLOCK_SHIFT(bitmap
)) >= start
)
978 set_page_attr(bitmap
, page
, BITMAP_PAGE_CLEAN
);
982 /* everything went OK */
984 bitmap_mask_state(bitmap
, BITMAP_STALE
, MASK_UNSET
);
986 if (bit_cnt
) { /* Kick recovery if any bits were set */
987 set_bit(MD_RECOVERY_NEEDED
, &bitmap
->mddev
->recovery
);
988 md_wakeup_thread(bitmap
->mddev
->thread
);
991 printk(KERN_INFO
"%s: bitmap initialized from disk: "
992 "read %lu/%lu pages, set %lu bits\n",
993 bmname(bitmap
), bitmap
->file_pages
, num_pages
, bit_cnt
);
998 printk(KERN_INFO
"%s: bitmap initialisation failed: %d\n",
999 bmname(bitmap
), ret
);
1003 void bitmap_write_all(struct bitmap
*bitmap
)
1005 /* We don't actually write all bitmap blocks here,
1006 * just flag them as needing to be written
1010 for (i
=0; i
< bitmap
->file_pages
; i
++)
1011 set_page_attr(bitmap
, bitmap
->filemap
[i
],
1012 BITMAP_PAGE_NEEDWRITE
);
1016 static void bitmap_count_page(struct bitmap
*bitmap
, sector_t offset
, int inc
)
1018 sector_t chunk
= offset
>> CHUNK_BLOCK_SHIFT(bitmap
);
1019 unsigned long page
= chunk
>> PAGE_COUNTER_SHIFT
;
1020 bitmap
->bp
[page
].count
+= inc
;
1022 if (page == 0) printk("count page 0, offset %llu: %d gives %d\n",
1023 (unsigned long long)offset, inc, bitmap->bp[page].count);
1025 bitmap_checkfree(bitmap
, page
);
1027 static bitmap_counter_t
*bitmap_get_counter(struct bitmap
*bitmap
,
1028 sector_t offset
, int *blocks
,
1032 * bitmap daemon -- periodically wakes up to clean bits and flush pages
1036 void bitmap_daemon_work(struct bitmap
*bitmap
)
1039 unsigned long flags
;
1040 struct page
*page
= NULL
, *lastpage
= NULL
;
1046 if (time_before(jiffies
, bitmap
->daemon_lastrun
+ bitmap
->daemon_sleep
*HZ
))
1049 bitmap
->daemon_lastrun
= jiffies
;
1050 if (bitmap
->allclean
) {
1051 bitmap
->mddev
->thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
1054 bitmap
->allclean
= 1;
1056 for (j
= 0; j
< bitmap
->chunks
; j
++) {
1057 bitmap_counter_t
*bmc
;
1058 spin_lock_irqsave(&bitmap
->lock
, flags
);
1059 if (!bitmap
->filemap
) {
1060 /* error or shutdown */
1061 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
1065 page
= filemap_get_page(bitmap
, j
);
1067 if (page
!= lastpage
) {
1068 /* skip this page unless it's marked as needing cleaning */
1069 if (!test_page_attr(bitmap
, page
, BITMAP_PAGE_CLEAN
)) {
1070 int need_write
= test_page_attr(bitmap
, page
,
1071 BITMAP_PAGE_NEEDWRITE
);
1073 clear_page_attr(bitmap
, page
, BITMAP_PAGE_NEEDWRITE
);
1075 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
1077 write_page(bitmap
, page
, 0);
1078 bitmap
->allclean
= 0;
1083 /* grab the new page, sync and release the old */
1084 if (lastpage
!= NULL
) {
1085 if (test_page_attr(bitmap
, lastpage
, BITMAP_PAGE_NEEDWRITE
)) {
1086 clear_page_attr(bitmap
, lastpage
, BITMAP_PAGE_NEEDWRITE
);
1087 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
1088 write_page(bitmap
, lastpage
, 0);
1090 set_page_attr(bitmap
, lastpage
, BITMAP_PAGE_NEEDWRITE
);
1091 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
1094 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
1097 /* We are possibly going to clear some bits, so make
1098 * sure that events_cleared is up-to-date.
1100 if (bitmap
->need_sync
) {
1102 bitmap
->need_sync
= 0;
1103 sb
= kmap_atomic(bitmap
->sb_page
, KM_USER0
);
1104 sb
->events_cleared
=
1105 cpu_to_le64(bitmap
->events_cleared
);
1106 kunmap_atomic(sb
, KM_USER0
);
1107 write_page(bitmap
, bitmap
->sb_page
, 1);
1109 spin_lock_irqsave(&bitmap
->lock
, flags
);
1110 clear_page_attr(bitmap
, page
, BITMAP_PAGE_CLEAN
);
1112 bmc
= bitmap_get_counter(bitmap
, j
<< CHUNK_BLOCK_SHIFT(bitmap
),
1116 if (j < 100) printk("bitmap: j=%lu, *bmc = 0x%x\n", j, *bmc);
1119 bitmap
->allclean
= 0;
1122 *bmc
=1; /* maybe clear the bit next time */
1123 set_page_attr(bitmap
, page
, BITMAP_PAGE_CLEAN
);
1124 } else if (*bmc
== 1) {
1125 /* we can clear the bit */
1127 bitmap_count_page(bitmap
, j
<< CHUNK_BLOCK_SHIFT(bitmap
),
1131 paddr
= kmap_atomic(page
, KM_USER0
);
1132 if (bitmap
->flags
& BITMAP_HOSTENDIAN
)
1133 clear_bit(file_page_offset(j
), paddr
);
1135 ext2_clear_bit(file_page_offset(j
), paddr
);
1136 kunmap_atomic(paddr
, KM_USER0
);
1139 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
1142 /* now sync the final page */
1143 if (lastpage
!= NULL
) {
1144 spin_lock_irqsave(&bitmap
->lock
, flags
);
1145 if (test_page_attr(bitmap
, lastpage
, BITMAP_PAGE_NEEDWRITE
)) {
1146 clear_page_attr(bitmap
, lastpage
, BITMAP_PAGE_NEEDWRITE
);
1147 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
1148 write_page(bitmap
, lastpage
, 0);
1150 set_page_attr(bitmap
, lastpage
, BITMAP_PAGE_NEEDWRITE
);
1151 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
1156 if (bitmap
->allclean
== 0)
1157 bitmap
->mddev
->thread
->timeout
= bitmap
->daemon_sleep
* HZ
;
1160 static bitmap_counter_t
*bitmap_get_counter(struct bitmap
*bitmap
,
1161 sector_t offset
, int *blocks
,
1164 /* If 'create', we might release the lock and reclaim it.
1165 * The lock must have been taken with interrupts enabled.
1166 * If !create, we don't release the lock.
1168 sector_t chunk
= offset
>> CHUNK_BLOCK_SHIFT(bitmap
);
1169 unsigned long page
= chunk
>> PAGE_COUNTER_SHIFT
;
1170 unsigned long pageoff
= (chunk
& PAGE_COUNTER_MASK
) << COUNTER_BYTE_SHIFT
;
1173 if (bitmap_checkpage(bitmap
, page
, create
) < 0) {
1174 csize
= ((sector_t
)1) << (CHUNK_BLOCK_SHIFT(bitmap
));
1175 *blocks
= csize
- (offset
& (csize
- 1));
1178 /* now locked ... */
1180 if (bitmap
->bp
[page
].hijacked
) { /* hijacked pointer */
1181 /* should we use the first or second counter field
1182 * of the hijacked pointer? */
1183 int hi
= (pageoff
> PAGE_COUNTER_MASK
);
1184 csize
= ((sector_t
)1) << (CHUNK_BLOCK_SHIFT(bitmap
) +
1185 PAGE_COUNTER_SHIFT
- 1);
1186 *blocks
= csize
- (offset
& (csize
- 1));
1187 return &((bitmap_counter_t
*)
1188 &bitmap
->bp
[page
].map
)[hi
];
1189 } else { /* page is allocated */
1190 csize
= ((sector_t
)1) << (CHUNK_BLOCK_SHIFT(bitmap
));
1191 *blocks
= csize
- (offset
& (csize
- 1));
1192 return (bitmap_counter_t
*)
1193 &(bitmap
->bp
[page
].map
[pageoff
]);
1197 int bitmap_startwrite(struct bitmap
*bitmap
, sector_t offset
, unsigned long sectors
, int behind
)
1199 if (!bitmap
) return 0;
1202 atomic_inc(&bitmap
->behind_writes
);
1203 PRINTK(KERN_DEBUG
"inc write-behind count %d/%d\n",
1204 atomic_read(&bitmap
->behind_writes
), bitmap
->max_write_behind
);
1209 bitmap_counter_t
*bmc
;
1211 spin_lock_irq(&bitmap
->lock
);
1212 bmc
= bitmap_get_counter(bitmap
, offset
, &blocks
, 1);
1214 spin_unlock_irq(&bitmap
->lock
);
1218 if (unlikely((*bmc
& COUNTER_MAX
) == COUNTER_MAX
)) {
1219 DEFINE_WAIT(__wait
);
1220 /* note that it is safe to do the prepare_to_wait
1221 * after the test as long as we do it before dropping
1224 prepare_to_wait(&bitmap
->overflow_wait
, &__wait
,
1225 TASK_UNINTERRUPTIBLE
);
1226 spin_unlock_irq(&bitmap
->lock
);
1227 blk_unplug(bitmap
->mddev
->queue
);
1229 finish_wait(&bitmap
->overflow_wait
, &__wait
);
1235 bitmap_file_set_bit(bitmap
, offset
);
1236 bitmap_count_page(bitmap
,offset
, 1);
1237 blk_plug_device(bitmap
->mddev
->queue
);
1245 spin_unlock_irq(&bitmap
->lock
);
1248 if (sectors
> blocks
)
1252 bitmap
->allclean
= 0;
1256 void bitmap_endwrite(struct bitmap
*bitmap
, sector_t offset
, unsigned long sectors
,
1257 int success
, int behind
)
1259 if (!bitmap
) return;
1261 atomic_dec(&bitmap
->behind_writes
);
1262 PRINTK(KERN_DEBUG
"dec write-behind count %d/%d\n",
1263 atomic_read(&bitmap
->behind_writes
), bitmap
->max_write_behind
);
1268 unsigned long flags
;
1269 bitmap_counter_t
*bmc
;
1271 spin_lock_irqsave(&bitmap
->lock
, flags
);
1272 bmc
= bitmap_get_counter(bitmap
, offset
, &blocks
, 0);
1274 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
1279 bitmap
->events_cleared
< bitmap
->mddev
->events
) {
1280 bitmap
->events_cleared
= bitmap
->mddev
->events
;
1281 bitmap
->need_sync
= 1;
1284 if (!success
&& ! (*bmc
& NEEDED_MASK
))
1285 *bmc
|= NEEDED_MASK
;
1287 if ((*bmc
& COUNTER_MAX
) == COUNTER_MAX
)
1288 wake_up(&bitmap
->overflow_wait
);
1292 set_page_attr(bitmap
,
1293 filemap_get_page(bitmap
, offset
>> CHUNK_BLOCK_SHIFT(bitmap
)),
1296 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
1298 if (sectors
> blocks
)
1304 int bitmap_start_sync(struct bitmap
*bitmap
, sector_t offset
, int *blocks
,
1307 bitmap_counter_t
*bmc
;
1309 if (bitmap
== NULL
) {/* FIXME or bitmap set as 'failed' */
1311 return 1; /* always resync if no bitmap */
1313 spin_lock_irq(&bitmap
->lock
);
1314 bmc
= bitmap_get_counter(bitmap
, offset
, blocks
, 0);
1320 else if (NEEDED(*bmc
)) {
1322 if (!degraded
) { /* don't set/clear bits if degraded */
1323 *bmc
|= RESYNC_MASK
;
1324 *bmc
&= ~NEEDED_MASK
;
1328 spin_unlock_irq(&bitmap
->lock
);
1329 bitmap
->allclean
= 0;
1333 void bitmap_end_sync(struct bitmap
*bitmap
, sector_t offset
, int *blocks
, int aborted
)
1335 bitmap_counter_t
*bmc
;
1336 unsigned long flags
;
1338 if (offset == 0) printk("bitmap_end_sync 0 (%d)\n", aborted);
1339 */ if (bitmap
== NULL
) {
1343 spin_lock_irqsave(&bitmap
->lock
, flags
);
1344 bmc
= bitmap_get_counter(bitmap
, offset
, blocks
, 0);
1349 if (offset == 0) printk("bitmap_end sync found 0x%x, blocks %d\n", *bmc, *blocks);
1352 *bmc
&= ~RESYNC_MASK
;
1354 if (!NEEDED(*bmc
) && aborted
)
1355 *bmc
|= NEEDED_MASK
;
1358 set_page_attr(bitmap
,
1359 filemap_get_page(bitmap
, offset
>> CHUNK_BLOCK_SHIFT(bitmap
)),
1365 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
1366 bitmap
->allclean
= 0;
1369 void bitmap_close_sync(struct bitmap
*bitmap
)
1371 /* Sync has finished, and any bitmap chunks that weren't synced
1372 * properly have been aborted. It remains to us to clear the
1373 * RESYNC bit wherever it is still on
1375 sector_t sector
= 0;
1379 while (sector
< bitmap
->mddev
->resync_max_sectors
) {
1380 bitmap_end_sync(bitmap
, sector
, &blocks
, 0);
1385 void bitmap_cond_end_sync(struct bitmap
*bitmap
, sector_t sector
)
1393 bitmap
->last_end_sync
= jiffies
;
1396 if (time_before(jiffies
, (bitmap
->last_end_sync
1397 + bitmap
->daemon_sleep
* HZ
)))
1399 wait_event(bitmap
->mddev
->recovery_wait
,
1400 atomic_read(&bitmap
->mddev
->recovery_active
) == 0);
1402 sector
&= ~((1ULL << CHUNK_BLOCK_SHIFT(bitmap
)) - 1);
1404 while (s
< sector
&& s
< bitmap
->mddev
->resync_max_sectors
) {
1405 bitmap_end_sync(bitmap
, s
, &blocks
, 0);
1408 bitmap
->last_end_sync
= jiffies
;
1411 static void bitmap_set_memory_bits(struct bitmap
*bitmap
, sector_t offset
, int needed
)
1413 /* For each chunk covered by any of these sectors, set the
1414 * counter to 1 and set resync_needed. They should all
1415 * be 0 at this point
1419 bitmap_counter_t
*bmc
;
1420 spin_lock_irq(&bitmap
->lock
);
1421 bmc
= bitmap_get_counter(bitmap
, offset
, &secs
, 1);
1423 spin_unlock_irq(&bitmap
->lock
);
1428 *bmc
= 1 | (needed
?NEEDED_MASK
:0);
1429 bitmap_count_page(bitmap
, offset
, 1);
1430 page
= filemap_get_page(bitmap
, offset
>> CHUNK_BLOCK_SHIFT(bitmap
));
1431 set_page_attr(bitmap
, page
, BITMAP_PAGE_CLEAN
);
1433 spin_unlock_irq(&bitmap
->lock
);
1434 bitmap
->allclean
= 0;
1437 /* dirty the memory and file bits for bitmap chunks "s" to "e" */
1438 void bitmap_dirty_bits(struct bitmap
*bitmap
, unsigned long s
, unsigned long e
)
1440 unsigned long chunk
;
1442 for (chunk
= s
; chunk
<= e
; chunk
++) {
1443 sector_t sec
= chunk
<< CHUNK_BLOCK_SHIFT(bitmap
);
1444 bitmap_set_memory_bits(bitmap
, sec
, 1);
1445 bitmap_file_set_bit(bitmap
, sec
);
1450 * flush out any pending updates
1452 void bitmap_flush(mddev_t
*mddev
)
1454 struct bitmap
*bitmap
= mddev
->bitmap
;
1457 if (!bitmap
) /* there was no bitmap */
1460 /* run the daemon_work three time to ensure everything is flushed
1463 sleep
= bitmap
->daemon_sleep
;
1464 bitmap
->daemon_sleep
= 0;
1465 bitmap_daemon_work(bitmap
);
1466 bitmap_daemon_work(bitmap
);
1467 bitmap_daemon_work(bitmap
);
1468 bitmap
->daemon_sleep
= sleep
;
1469 bitmap_update_sb(bitmap
);
1473 * free memory that was allocated
1475 static void bitmap_free(struct bitmap
*bitmap
)
1477 unsigned long k
, pages
;
1478 struct bitmap_page
*bp
;
1480 if (!bitmap
) /* there was no bitmap */
1483 /* release the bitmap file and kill the daemon */
1484 bitmap_file_put(bitmap
);
1487 pages
= bitmap
->pages
;
1489 /* free all allocated memory */
1491 if (bp
) /* deallocate the page memory */
1492 for (k
= 0; k
< pages
; k
++)
1493 if (bp
[k
].map
&& !bp
[k
].hijacked
)
1498 void bitmap_destroy(mddev_t
*mddev
)
1500 struct bitmap
*bitmap
= mddev
->bitmap
;
1502 if (!bitmap
) /* there was no bitmap */
1505 mddev
->bitmap
= NULL
; /* disconnect from the md device */
1507 mddev
->thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
1509 bitmap_free(bitmap
);
1513 * initialize the bitmap structure
1514 * if this returns an error, bitmap_destroy must be called to do clean up
1516 int bitmap_create(mddev_t
*mddev
)
1518 struct bitmap
*bitmap
;
1519 unsigned long blocks
= mddev
->resync_max_sectors
;
1520 unsigned long chunks
;
1521 unsigned long pages
;
1522 struct file
*file
= mddev
->bitmap_file
;
1526 BUILD_BUG_ON(sizeof(bitmap_super_t
) != 256);
1528 if (!file
&& !mddev
->bitmap_offset
) /* bitmap disabled, nothing to do */
1531 BUG_ON(file
&& mddev
->bitmap_offset
);
1533 bitmap
= kzalloc(sizeof(*bitmap
), GFP_KERNEL
);
1537 spin_lock_init(&bitmap
->lock
);
1538 atomic_set(&bitmap
->pending_writes
, 0);
1539 init_waitqueue_head(&bitmap
->write_wait
);
1540 init_waitqueue_head(&bitmap
->overflow_wait
);
1542 bitmap
->mddev
= mddev
;
1544 bitmap
->file
= file
;
1545 bitmap
->offset
= mddev
->bitmap_offset
;
1548 do_sync_mapping_range(file
->f_mapping
, 0, LLONG_MAX
,
1549 SYNC_FILE_RANGE_WAIT_BEFORE
|
1550 SYNC_FILE_RANGE_WRITE
|
1551 SYNC_FILE_RANGE_WAIT_AFTER
);
1553 /* read superblock from bitmap file (this sets bitmap->chunksize) */
1554 err
= bitmap_read_sb(bitmap
);
1558 bitmap
->chunkshift
= ffz(~bitmap
->chunksize
);
1560 /* now that chunksize and chunkshift are set, we can use these macros */
1561 chunks
= (blocks
+ CHUNK_BLOCK_RATIO(bitmap
) - 1) /
1562 CHUNK_BLOCK_RATIO(bitmap
);
1563 pages
= (chunks
+ PAGE_COUNTER_RATIO
- 1) / PAGE_COUNTER_RATIO
;
1567 bitmap
->chunks
= chunks
;
1568 bitmap
->pages
= pages
;
1569 bitmap
->missing_pages
= pages
;
1570 bitmap
->counter_bits
= COUNTER_BITS
;
1572 bitmap
->syncchunk
= ~0UL;
1574 #ifdef INJECT_FATAL_FAULT_1
1577 bitmap
->bp
= kzalloc(pages
* sizeof(*bitmap
->bp
), GFP_KERNEL
);
1583 /* now that we have some pages available, initialize the in-memory
1584 * bitmap from the on-disk bitmap */
1586 if (mddev
->degraded
== 0
1587 || bitmap
->events_cleared
== mddev
->events
)
1588 /* no need to keep dirty bits to optimise a re-add of a missing device */
1589 start
= mddev
->recovery_cp
;
1590 err
= bitmap_init_from_disk(bitmap
, start
);
1595 printk(KERN_INFO
"created bitmap (%lu pages) for device %s\n",
1596 pages
, bmname(bitmap
));
1598 mddev
->bitmap
= bitmap
;
1600 mddev
->thread
->timeout
= bitmap
->daemon_sleep
* HZ
;
1602 bitmap_update_sb(bitmap
);
1604 return (bitmap
->flags
& BITMAP_WRITE_ERROR
) ? -EIO
: 0;
1607 bitmap_free(bitmap
);
1611 /* the bitmap API -- for raid personalities */
1612 EXPORT_SYMBOL(bitmap_startwrite
);
1613 EXPORT_SYMBOL(bitmap_endwrite
);
1614 EXPORT_SYMBOL(bitmap_start_sync
);
1615 EXPORT_SYMBOL(bitmap_end_sync
);
1616 EXPORT_SYMBOL(bitmap_unplug
);
1617 EXPORT_SYMBOL(bitmap_close_sync
);
1618 EXPORT_SYMBOL(bitmap_cond_end_sync
);