diff options
Diffstat (limited to 'fs/btrfs/volumes.h')
| -rw-r--r-- | fs/btrfs/volumes.h | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index e86e9f25ba0f..650e131d079e 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -460,11 +460,22 @@ struct btrfs_io_context { u16 replace_nr_stripes; s16 replace_stripe_src; /* - * logical block numbers for the start of each stripe - * The last one or two are p/q. These are sorted, - * so raid_map[0] is the start of our full stripe + * Logical bytenr of the full stripe start, only for RAID56 cases. + * + * When this value is set to other than (u64)-1, the stripes[] should + * follow this pattern: + * + * (real_stripes = num_stripes - replace_nr_stripes) + * (data_stripes = (is_raid6) ? (real_stripes - 2) : (real_stripes - 1)) + * + * stripes[0]: The first data stripe + * stripes[1]: The second data stripe + * ... + * stripes[data_stripes - 1]: The last data stripe + * stripes[data_stripes]: The P stripe + * stripes[data_stripes + 1]: The Q stripe (only for RAID6). */ - u64 *raid_map; + u64 full_stripe_logical; struct btrfs_io_stripe stripes[]; }; |