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| author |   NeilBrown <neilb@suse.de> | 2012-05-04 17:03:18 +1000 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2012-05-04 17:03:18 +1000 |
| commit | b16b1b6cd052acbacc0a15f934bca9b354534d48 (patch) | |
| tree | ba5b2e72e04a18a4bd83429f089d16637b9a6343 | |
| parent | Linux 3.4-rc5 (diff) | |
| download | linux-dev-b16b1b6cd052acbacc0a15f934bca9b354534d48.tar.xz linux-dev-b16b1b6cd052acbacc0a15f934bca9b354534d48.zip | |
md/bitmap: fix calculation of 'chunks' - missing shift.
commit 61a0d80c "md/bitmap: discard CHUNK_BLOCK_SHIFT macro"
replaced CHUNK_BLOCK_RATIO() by the same text that was
replacing CHUNK_BLOCK_SHIFT() - which is clearly wrong.
The result is that 'chunks' is often too small by 1,
which can sometimes result in a crash (not sure how).
So use the correct replacement, and get rid of CHUNK_BLOCK_RATIO
which is no longe used.
Reported-by: Karl Newman <siliconfiend@gmail.com>
Tested-by: Karl Newman <siliconfiend@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
| -rw-r--r-- | drivers/md/bitmap.c | 3 | ||||
| -rw-r--r-- | drivers/md/bitmap.h | 3 |
2 files changed, 1 insertions, 5 deletions
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c index 97e73e555d11..17e2b472e16d 100644 --- a/drivers/md/bitmap.c +++ b/drivers/md/bitmap.c @@ -1727,8 +1727,7 @@ int bitmap_create(struct mddev *mddev) bitmap->chunkshift = (ffz(~mddev->bitmap_info.chunksize) - BITMAP_BLOCK_SHIFT); - /* now that chunksize and chunkshift are set, we can use these macros */ - chunks = (blocks + bitmap->chunkshift - 1) >> + chunks = (blocks + (1 << bitmap->chunkshift) - 1) >> bitmap->chunkshift; pages = (chunks + PAGE_COUNTER_RATIO - 1) / PAGE_COUNTER_RATIO; diff --git a/drivers/md/bitmap.h b/drivers/md/bitmap.h index 55ca5aec84e4..b44b0aba2d47 100644 --- a/drivers/md/bitmap.h +++ b/drivers/md/bitmap.h @@ -101,9 +101,6 @@ typedef __u16 bitmap_counter_t; #define BITMAP_BLOCK_SHIFT 9 -/* how many blocks per chunk? (this is variable) */ -#define CHUNK_BLOCK_RATIO(bitmap) ((bitmap)->mddev->bitmap_info.chunksize >> BITMAP_BLOCK_SHIFT) - #endif /* |