path: root/fs/btrfs/ctree.h
diff options
authorDavid Sterba <dsterba@suse.com>2018-03-02 22:56:53 +0100
committerDavid Sterba <dsterba@suse.com>2019-11-18 17:51:49 +0100
commit47e6f7423b9196ad6832d26cae52b7015f81ee7f (patch)
tree3f06408a77645e1546ed90445cf6584c515ca44d /fs/btrfs/ctree.h
parentbtrfs: sink write flags to cow_file_range_async (diff)
btrfs: add support for 3-copy replication (raid1c3)
Add new block group profile to store 3 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-copy RAID1. The minimum number of devices is 3, the maximum number of devices/chunks that can be lost/damaged is 2. Like RAID6 but with 33% space utilization. Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/ctree.h')
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 1c8f01eaf27c..aa1b437fb951 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -57,9 +57,9 @@ struct btrfs_ref;
* filesystem data as well that can be used to read data in order to repair
* read errors on other disks.
- * Current value is derived from RAID1 with 2 copies.
+ * Current value is derived from RAID1C3 with 3 copies.
-#define BTRFS_MAX_MIRRORS (2 + 1)
+#define BTRFS_MAX_MIRRORS (3 + 1)