[PATCH] md: don't allow new md/bitmap file to be set if one already exists

... otherwise we loose a reference and can never free the file.

Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 373ab92..63c5661 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2430,7 +2430,7 @@ static int set_bitmap_file(mddev_t *mddev, int fd)
 {
        int err;
 
-       if (mddev->pers)
+       if (mddev->pers || mddev->bitmap_file)
                return -EBUSY;
 
        mddev->bitmap_file = fget(fd);