diff options
| author | NeilBrown | 2009-05-07 12:47:19 +1000 |
|---|---|---|
| committer | NeilBrown | 2009-05-07 12:47:19 +1000 |
| commit | b74fd2826c5acce20e6f691437b2d19372bc2057 (patch) | |
| tree | 818e1fa7a7f91b1ca37279f19ce215f19256d7f0 /drivers | |
| parent | b4348f32dae3cb6eb4bc21c7ed8f76c0b11e9d6a (diff) | |
md: fix loading of out-of-date bitmap.
When md is loading a bitmap which it knows is out of date, it fills
each page with 1s and writes it back out again. However the
write_page call makes used of bitmap->file_pages and
bitmap->last_page_size which haven't been set correctly yet. So this
can sometimes fail.
Move the setting of file_pages and last_page_size to before the call
to write_page.
This bug can cause the assembly on an array to fail, thus making the
data inaccessible. Hence I think it is a suitable candidate for
-stable.
Cc: stable@kernel.org
Reported-by: Vojtech Pavlik <vojtech@suse.cz>
Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/md/bitmap.c | 11 |
1 files changed, 4 insertions, 7 deletions
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c index 1fb91edc7de2..bc1d64b7b63b 100644 --- a/drivers/md/bitmap.c +++ b/drivers/md/bitmap.c @@ -986,6 +986,9 @@ static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start) oldindex = index; oldpage = page; + bitmap->filemap[bitmap->file_pages++] = page; + bitmap->last_page_size = count; + if (outofdate) { /* * if bitmap is out of date, dirty the @@ -998,15 +1001,9 @@ static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start) write_page(bitmap, page, 1); ret = -EIO; - if (bitmap->flags & BITMAP_WRITE_ERROR) { - /* release, page not in filemap yet */ - put_page(page); + if (bitmap->flags & BITMAP_WRITE_ERROR) goto err; - } } - - bitmap->filemap[bitmap->file_pages++] = page; - bitmap->last_page_size = count; } paddr = kmap_atomic(page, KM_USER0); if (bitmap->flags & BITMAP_HOSTENDIAN) |