diff options
| author | Anand Jain <anand.jain@oracle.com> | 2019-04-02 18:07:40 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-04-17 08:37:53 +0200 |
| commit | 2fc37a0abf1ff4fdf35d1a90fb80ec98c588184a (patch) | |
| tree | 74640476f10944b88313dd9da82cf15e243031c5 | |
| parent | 979409e6f4590e881b0eee29aab8f22f8047c91c (diff) | |
btrfs: prop: fix vanished compression property after failed set
commit 272e5326c7837697882ce3162029ba893059b616 upstream.
The compression property resets to NULL, instead of the old value if we
fail to set the new compression parameter.
$ btrfs prop get /btrfs compression
compression=lzo
$ btrfs prop set /btrfs compression zli
ERROR: failed to set compression for /btrfs: Invalid argument
$ btrfs prop get /btrfs compression
This is because the compression property ->validate() is successful for
'zli' as the strncmp() used the length passed from the userspace.
Fix it by using the expected string length in strncmp().
Fixes: 63541927c8d1 ("Btrfs: add support for inode properties")
Fixes: 5c1aab1dd544 ("btrfs: Add zstd support")
CC: stable@vger.kernel.org # 4.14+
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/btrfs/props.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/btrfs/props.c b/fs/btrfs/props.c index 3eee2f7e1dd2..266f9069307b 100644 --- a/fs/btrfs/props.c +++ b/fs/btrfs/props.c @@ -386,11 +386,11 @@ int btrfs_subvol_inherit_props(struct btrfs_trans_handle *trans, static int prop_compression_validate(const char *value, size_t len) { - if (!strncmp("lzo", value, len)) + if (!strncmp("lzo", value, 3)) return 0; - else if (!strncmp("zlib", value, len)) + else if (!strncmp("zlib", value, 4)) return 0; - else if (!strncmp("zstd", value, len)) + else if (!strncmp("zstd", value, 4)) return 0; return -EINVAL; |