md/bitmap: disable bitmap_resize for file-backed bitmaps.

[ Upstream commit e8a27f836f165c26f867ece7f31eb5c811692319 ]

bitmap_resize() does not work for file-backed bitmaps.
The buffer_heads are allocated and initialized when
the bitmap is read from the file, but resize doesn't
read from the file, it loads from the internal bitmap.
When it comes time to write the new bitmap, the bh is
non-existent and we crash.

The common case when growing an array involves making the array larger,
and that normally means making the bitmap larger.  Doing
that inside the kernel is possible, but would need more code.
It is probably easier to require people who use file-backed
bitmaps to remove them and re-add after a reshape.

So this patch disables the resizing of arrays which have
file-backed bitmaps.  This is better than crashing.

Reported-by: Zhilong Liu <zlliu@suse.com>
Fixes: d60b479d177a ("md/bitmap: add bitmap_resize function to allow bitmap resizing.")
Cc: stable@vger.kernel.org (v3.5+).
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>

diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index a7621a2589365d26f1805cfc4c06167ac2c4f6f5..7078447c8cd7571c6d69c33cf7aae97d459ddd55 100644 (file)
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -1965,6 +1965,11 @@ int bitmap_resize(struct bitmap *bitmap, sector_t blocks,
        long pages;
        struct bitmap_page *new_bp;
 
+       if (bitmap->storage.file && !init) {
+               pr_info("md: cannot resize file-based bitmap\n");
+               return -EINVAL;
+       }
+
        if (chunksize == 0) {
                /* If there is enough space, leave the chunk size unchanged,
                 * else increase by factor of two until there is enough space.