diff options
| author | Adam Borowski <kilobyte@angband.pl> | 2017-09-15 17:36:58 +0200 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2017-11-01 20:45:34 +0100 |
| commit | fa4d885a482ef52ad3efa12a5799a3f6408b0718 (patch) | |
| tree | b2c77afc273d184129350162e5b564a545f59916 /fs/btrfs/compression.c | |
| parent | f51d2b59120ff364a5e612a594ed358767e1cd09 (diff) | |
btrfs: allow setting zlib compression level via :9
This is bikeshedding, but it seems people are drastically more likely to
understand "zlib:9" as compression level rather than an algorithm
version compared to "zlib9".
Based on feedback on the mailinglist, the ":9" will be the only accepted
syntax. The level must be a single digit. Unrecognized format will
result to the default, for forward compatibility in a similar way the
compression algorithm specifier was relaxed in commit
a7164fa4e055daf6368c ("btrfs: prepare for extensions in compression
options").
Signed-off-by: Adam Borowski <kilobyte@angband.pl>
Reviewed-by: David Sterba <dsterba@suse.com>
[ tighten the accepted format ]
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/compression.c')
| -rw-r--r-- | fs/btrfs/compression.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c index 3e452525f8ad..083f9c485875 100644 --- a/fs/btrfs/compression.c +++ b/fs/btrfs/compression.c @@ -1111,8 +1111,9 @@ unsigned int btrfs_compress_str2level(const char *str) if (strncmp(str, "zlib", 4) != 0) return 0; - if ('1' <= str[4] && str[4] <= '9' ) - return str[4] - '0'; + /* Accepted form: zlib:1 up to zlib:9 and nothing left after the number */ + if (str[4] == ':' && '1' <= str[5] && str[5] <= '9' && str[6] == 0) + return str[5] - '0'; return 0; } |