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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/ctree.h
parentbtrfs: add support for 3-copy replication (raid1c3) (diff)
downloadlinux-dev-8d6fac0087e538173f34ca7431ed9b58581acf28.tar.xz
linux-dev-8d6fac0087e538173f34ca7431ed9b58581acf28.zip
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/ctree.h')
-rw-r--r--fs/btrfs/ctree.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index aa1b437fb951..923a8804ae94 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 RAID1C3 with 3 copies.
+ * Current value is derived from RAID1C4 with 4 copies.
*/
-#define BTRFS_MAX_MIRRORS (3 + 1)
+#define BTRFS_MAX_MIRRORS (4 + 1)
#define BTRFS_MAX_LEVEL 8