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

commit e8a27f836f165c26f867ece7f31eb5c811692319 upstream.

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.")
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index 2d826927a3bf9bd1da8c8f6850fa29e320011908..fb02c3979bf47f62a2ee69846a3b678bcc7956ba 100644 (file)
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -1992,6 +1992,11 @@ 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.