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authorMark Fasheh <mfasheh@suse.com>2011-08-29 14:17:04 -0700
committerDavid Sterba <dsterba@suse.cz>2012-03-22 01:45:37 +0100
commite5df957328b18baa731307c66cfe8e7a4981df65 (patch)
tree19f092c1e65c639c17a2fc0582d01b0ebfb3e3a7
parent4ed1d16e944c61cfb8a78159548672e7df168d97 (diff)
btrfs: Go readonly on bad extent refs in update_ref_for_cow()
update_ref_for_cow() will BUG_ON() after it's call to btrfs_lookup_extent_info() if no existing references are found. Since refs are computed directly from disk, this should be treated as a corruption instead of a logic error. Signed-off-by: Mark Fasheh <mfasheh@suse.de>
-rw-r--r--fs/btrfs/ctree.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index e2e43c07f6b..3b767d2b68e 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -333,7 +333,11 @@ static noinline int update_ref_for_cow(struct btrfs_trans_handle *trans,
buf->len, &refs, &flags);
if (ret)
return ret;
- BUG_ON(refs == 0);
+ if (refs == 0) {
+ ret = -EROFS;
+ btrfs_std_error(root->fs_info, ret);
+ return ret;
+ }
} else {
refs = 1;
if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID ||