diff options
| author | Josef Bacik <josef@redhat.com> | 2010-03-19 23:49:55 +0300 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2010-03-31 05:19:09 +0400 |
| commit | 1b1d1f6625e517a08640ddb4b8f8a0e025243fe3 (patch) | |
| tree | d662fe7e7d9ddec1214982b3dcd955228e18562f /fs/btrfs/extent-tree.c | |
| parent | 6cf8bfbf5e88edfb09a2bf0631a067060f534592 (diff) | |
| download | linux-1b1d1f6625e517a08640ddb4b8f8a0e025243fe3.tar.xz | |
Btrfs: fail to mount if we have problems reading the block groups
We don't actually check the return value of btrfs_read_block_groups, so we can
possibly succeed to mount, but then fail to say read the superblock xattr for
selinux which will cause the vfs code to deactivate the super.
This is a problem because in find_free_extent we just assume that we
will find the right space_info for the allocation we want. But if we
failed to read the block groups, we won't have setup any space_info's,
and we'll hit a NULL pointer deref in find_free_extent.
This patch fixes that problem by checking the return value of
btrfs_read_block_groups, and failing out properly. I've also added a
check in find_free_extent so if for some reason we don't find an
appropriate space_info, we just return -ENOSPC.
Signed-off-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/extent-tree.c')
| -rw-r--r-- | fs/btrfs/extent-tree.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 503a18eaef52..4c910359c807 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -4170,6 +4170,10 @@ static noinline int find_free_extent(struct btrfs_trans_handle *trans, ins->offset = 0; space_info = __find_space_info(root->fs_info, data); + if (!space_info) { + printk(KERN_ERR "No space info for %d\n", data); + return -ENOSPC; + } if (orig_root->ref_cows || empty_size) allowed_chunk_alloc = 1; @@ -7372,7 +7376,6 @@ static int find_first_block_group(struct btrfs_root *root, } path->slots[0]++; } - ret = -ENOENT; out: return ret; } |