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| 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 | 47e6f7423b9196ad6832d26cae52b7015f81ee7f (patch) | |
| tree | 3f06408a77645e1546ed90445cf6584c515ca44d /fs/btrfs/ctree.h | |
| parent | btrfs: sink write flags to cow_file_range_async (diff) | |
| download | linux-dev-47e6f7423b9196ad6832d26cae52b7015f81ee7f.tar.xz linux-dev-47e6f7423b9196ad6832d26cae52b7015f81ee7f.zip | |
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 '')
| -rw-r--r-- | fs/btrfs/ctree.h | 4 |
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) #define BTRFS_MAX_LEVEL 8 |