Commit 71a9c488 authored by David Sterba's avatar David Sterba
Browse files

btrfs: document BTRFS_MAX_MIRRORS 



The real meaning of that constant is not clear from the context due to
the target device inclusion.

Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent a07e8a46

fs/btrfs/ctree.h

+10 −1
Original line number Diff line number Diff line
@@ -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