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authorJosef Bacik <jbacik@fb.com>2016-09-23 13:23:28 +0200
committerDavid Sterba <dsterba@suse.com>2016-09-26 19:37:06 +0200
commit4867268c57ff709a7b6b86ae6f6537d846d1443a (patch)
treee0237d6308ff83ad8dde872e0f3f4eedbe5b6952 /fs/btrfs
parent2fd57fcb16483d718043940fd6dfeb176d4dc09c (diff)
Btrfs: don't BUG() during drop snapshot
Really there's lots of things that can go wrong here, kill all the BUG_ON()'s and replace the logic ones with ASSERT()'s and return EIO instead. Signed-off-by: Josef Bacik <jbacik@fb.com> [ switched to btrfs_err, errors go to common label ] Reviewed-by: Liu Bo <bo.li.liu@oracle.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs')
-rw-r--r--fs/btrfs/extent-tree.c38
1 files changed, 27 insertions, 11 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index a23597f6d3cd..11802eaaab54 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -8886,15 +8886,13 @@ static noinline int do_walk_down(struct btrfs_trans_handle *trans,
ret = btrfs_lookup_extent_info(trans, root, bytenr, level - 1, 1,
&wc->refs[level - 1],
&wc->flags[level - 1]);
- if (ret < 0) {
- btrfs_tree_unlock(next);
- free_extent_buffer(next);
- return ret;
- }
+ if (ret < 0)
+ goto out_unlock;
if (unlikely(wc->refs[level - 1] == 0)) {
btrfs_err(root->fs_info, "Missing references.");
- BUG();
+ ret = -EIO;
+ goto out_unlock;
}
*lookup_info = 0;
@@ -8946,7 +8944,12 @@ static noinline int do_walk_down(struct btrfs_trans_handle *trans,
}
level--;
- BUG_ON(level != btrfs_header_level(next));
+ ASSERT(level == btrfs_header_level(next));
+ if (level != btrfs_header_level(next)) {
+ btrfs_err(root->fs_info, "mismatched level");
+ ret = -EIO;
+ goto out_unlock;
+ }
path->nodes[level] = next;
path->slots[level] = 0;
path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING;
@@ -8961,8 +8964,15 @@ skip:
if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) {
parent = path->nodes[level]->start;
} else {
- BUG_ON(root->root_key.objectid !=
+ ASSERT(root->root_key.objectid ==
btrfs_header_owner(path->nodes[level]));
+ if (root->root_key.objectid !=
+ btrfs_header_owner(path->nodes[level])) {
+ btrfs_err(root->fs_info,
+ "mismatched block owner");
+ ret = -EIO;
+ goto out_unlock;
+ }
parent = 0;
}
@@ -8977,12 +8987,18 @@ skip:
}
ret = btrfs_free_extent(trans, root, bytenr, blocksize, parent,
root->root_key.objectid, level - 1, 0);
- BUG_ON(ret); /* -ENOMEM */
+ if (ret)
+ goto out_unlock;
}
+
+ *lookup_info = 1;
+ ret = 1;
+
+out_unlock:
btrfs_tree_unlock(next);
free_extent_buffer(next);
- *lookup_info = 1;
- return 1;
+
+ return ret;
}
/*