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authorJosef Bacik <jbacik@fusionio.com>2013-04-23 10:53:18 -0400
committerJosef Bacik <jbacik@fusionio.com>2013-05-06 15:55:04 -0400
commitfb7669b5a0695922a9813bb103303db3d7c79c8d (patch)
tree67e96d7bf0f389932e04367f2235e8d6a11d26a3 /fs/btrfs/volumes.c
parent79fb65a1f6d97febc232e1e4e56019b0c9208541 (diff)
downloadlinux-fb7669b5a0695922a9813bb103303db3d7c79c8d.tar.bz2
Btrfs: don't BUG_ON() in btrfs_num_copies
A user sent me a btrfs-image that was panicing because of some corruption. This is because we pass in a bogus value to btrfs_num_copies, and it panics. Instead just return 1. We only call btrfs_num_copies to see if there are other copies to try and read for things, so if we just return 1 it will make the callers exit out with an appropriate error value. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Diffstat (limited to 'fs/btrfs/volumes.c')
-rw-r--r--fs/btrfs/volumes.c20
1 files changed, 18 insertions, 2 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index c8a315d4b86f..c1a22178c6e8 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -4232,9 +4232,25 @@ int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len)
read_lock(&em_tree->lock);
em = lookup_extent_mapping(em_tree, logical, len);
read_unlock(&em_tree->lock);
- BUG_ON(!em);
- BUG_ON(em->start > logical || em->start + em->len < logical);
+ /*
+ * We could return errors for these cases, but that could get ugly and
+ * we'd probably do the same thing which is just not do anything else
+ * and exit, so return 1 so the callers don't try to use other copies.
+ */
+ if (!em) {
+ btrfs_emerg(fs_info, "No mapping for %Lu-%Lu\n", logical,
+ logical+len);
+ return 1;
+ }
+
+ if (em->start > logical || em->start + em->len < logical) {
+ btrfs_emerg(fs_info, "Invalid mapping for %Lu-%Lu, got "
+ "%Lu-%Lu\n", logical, logical+len, em->start,
+ em->start + em->len);
+ return 1;
+ }
+
map = (struct map_lookup *)em->bdev;
if (map->type & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1))
ret = map->num_stripes;