diff options
author | Misono Tomohiro <misono.tomohiro@jp.fujitsu.com> | 2018-05-15 16:51:26 +0900 |
---|---|---|
committer | David Sterba <dsterba@suse.com> | 2018-05-17 14:18:25 +0200 |
commit | 1a63c198ddb810c790101d693c7071cca703b3c7 (patch) | |
tree | d5682e5746bc2da20ddf577f0e95c335ee99ca1f /fs | |
parent | 31d11b83b96faaee4bb514d375a09489117c3e8d (diff) | |
download | linux-1a63c198ddb810c790101d693c7071cca703b3c7.tar.gz linux-1a63c198ddb810c790101d693c7071cca703b3c7.tar.bz2 linux-1a63c198ddb810c790101d693c7071cca703b3c7.zip |
btrfs: property: Set incompat flag if lzo/zstd compression is set
Incompat flag of LZO/ZSTD compression should be set at:
1. mount time (-o compress/compress-force)
2. when defrag is done
3. when property is set
Currently 3. is missing and this commit adds this.
This could lead to a filesystem that uses ZSTD but is not marked as
such. If a kernel without a ZSTD support encounteres a ZSTD compressed
extent, it will handle that but this could be confusing to the user.
Typically the filesystem is mounted with the ZSTD option, but the
discrepancy can arise when a filesystem is never mounted with ZSTD and
then the property on some file is set (and some new extents are
written). A simple mount with -o compress=zstd will fix that up on an
unpatched kernel.
Same goes for LZO, but this has been around for a very long time
(2.6.37) so it's unlikely that a pre-LZO kernel would be used.
Fixes: 5c1aab1dd544 ("btrfs: Add zstd support")
CC: stable@vger.kernel.org # 4.14+
Signed-off-by: Tomohiro Misono <misono.tomohiro@jp.fujitsu.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ add user visible impact ]
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/btrfs/props.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/fs/btrfs/props.c b/fs/btrfs/props.c index 53a8c95828e3..dc6140013ae8 100644 --- a/fs/btrfs/props.c +++ b/fs/btrfs/props.c @@ -380,6 +380,7 @@ static int prop_compression_apply(struct inode *inode, const char *value, size_t len) { + struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); int type; if (len == 0) { @@ -390,14 +391,17 @@ static int prop_compression_apply(struct inode *inode, return 0; } - if (!strncmp("lzo", value, 3)) + if (!strncmp("lzo", value, 3)) { type = BTRFS_COMPRESS_LZO; - else if (!strncmp("zlib", value, 4)) + btrfs_set_fs_incompat(fs_info, COMPRESS_LZO); + } else if (!strncmp("zlib", value, 4)) { type = BTRFS_COMPRESS_ZLIB; - else if (!strncmp("zstd", value, len)) + } else if (!strncmp("zstd", value, len)) { type = BTRFS_COMPRESS_ZSTD; - else + btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD); + } else { return -EINVAL; + } BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; |