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authorDavid Sterba <dsterba@suse.com>2018-03-02 22:56:53 +0100
committerDavid Sterba <dsterba@suse.com>2019-11-18 17:51:49 +0100
commit8d6fac0087e538173f34ca7431ed9b58581acf28 (patch)
tree83a1c2bc2bf18cb604ce09124c1933e06d845c4d /fs/btrfs/volumes.h
parent47e6f7423b9196ad6832d26cae52b7015f81ee7f (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/volumes.h')
-rw-r--r--fs/btrfs/volumes.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index a4e26b84e1b9..46987a2da786 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -547,6 +547,8 @@ static inline enum btrfs_raid_types btrfs_bg_flags_to_raid_index(u64 flags)
return BTRFS_RAID_RAID1;
else if (flags & BTRFS_BLOCK_GROUP_RAID1C3)
return BTRFS_RAID_RAID1C3;
+ else if (flags & BTRFS_BLOCK_GROUP_RAID1C4)
+ return BTRFS_RAID_RAID1C4;
else if (flags & BTRFS_BLOCK_GROUP_DUP)
return BTRFS_RAID_DUP;
else if (flags & BTRFS_BLOCK_GROUP_RAID0)