diff options
| -rw-r--r-- | fs/btrfs/ctree.h | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index fb7435533478..31198499f175 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -46,7 +46,16 @@ struct btrfs_ref; #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */ -#define BTRFS_MAX_MIRRORS 3 +/* + * Maximum number of mirrors that can be available for all profiles counting + * the target device of dev-replace as one. During an active device replace + * procedure, the target device of the copy operation is a mirror for the + * 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. + */ +#define BTRFS_MAX_MIRRORS (2 + 1) #define BTRFS_MAX_LEVEL 8 |