diff options
| author | David Sterba <dsterba@suse.com> | 2018-03-02 22:56:53 +0100 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2019-11-18 17:51:49 +0100 |
| commit | 8d6fac0087e538173f34ca7431ed9b58581acf28 (patch) | |
| tree | 83a1c2bc2bf18cb604ce09124c1933e06d845c4d /fs/btrfs/super.c | |
| parent | 47e6f7423b9196ad6832d26cae52b7015f81ee7f (diff) | |
btrfs: add support for 4-copy replication (raid1c4)
Add new block group profile to store 4 copies in a simliar way that
current RAID1 does. The profile attributes and constraints are defined
in the raid table and used by the same code that already handles the 2-
and 3-copy RAID1.
The minimum number of devices is 4, the maximum number of devices/chunks
that can be lost/damaged is 3. There is no comparable traditional RAID
level, the profile is added for future needs to accompany triple-parity
and beyond.
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/super.c')
| -rw-r--r-- | fs/btrfs/super.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index a5aff138e2e0..a98c3c71fc54 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -1937,6 +1937,8 @@ static inline int btrfs_calc_avail_data_space(struct btrfs_fs_info *fs_info, num_stripes = 2; else if (type & BTRFS_BLOCK_GROUP_RAID1C3) num_stripes = 3; + else if (type & BTRFS_BLOCK_GROUP_RAID1C4) + num_stripes = 4; else if (type & BTRFS_BLOCK_GROUP_RAID10) num_stripes = 4; |