diff options
| author | Chris Mason <chris.mason@oracle.com> | 2008-04-29 14:12:09 -0400 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2008-09-25 11:04:02 -0400 |
| commit | 2fff734fafa742236aecbdcdc8b1ff4d221cbaca (patch) | |
| tree | 2bec8ce43afd242c95535646550a93f383eb2997 /fs/btrfs/volumes.c | |
| parent | a236aed14ccb0661611d4416f6b573d892bdc60a (diff) | |
| download | op-kernel-dev-2fff734fafa742236aecbdcdc8b1ff4d221cbaca.zip op-kernel-dev-2fff734fafa742236aecbdcdc8b1ff4d221cbaca.tar.gz | |
Btrfs: Tune stripe selection for raid1 and raid10
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/volumes.c')
| -rw-r--r-- | fs/btrfs/volumes.c | 17 |
1 files changed, 7 insertions, 10 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 57ab755..6d8dd44 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -1509,17 +1509,17 @@ again: if (map->type & BTRFS_BLOCK_GROUP_RAID1) { if (unplug_page || (rw & (1 << BIO_RW))) num_stripes = map->num_stripes; - else if (mirror_num) { + else if (mirror_num) stripe_index = mirror_num - 1; - } else { - u64 orig_stripe_nr = stripe_nr; - stripe_index = do_div(orig_stripe_nr, num_stripes); - } + else + stripe_index = current->pid % map->num_stripes; + } else if (map->type & BTRFS_BLOCK_GROUP_DUP) { if (rw & (1 << BIO_RW)) num_stripes = map->num_stripes; else if (mirror_num) stripe_index = mirror_num - 1; + } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { int factor = map->num_stripes / map->sub_stripes; @@ -1530,11 +1530,8 @@ again: num_stripes = map->sub_stripes; else if (mirror_num) stripe_index += mirror_num - 1; - else { - u64 orig_stripe_nr = stripe_nr; - stripe_index += do_div(orig_stripe_nr, - map->sub_stripes); - } + else + stripe_index += current->pid % map->sub_stripes; } else { /* * after this do_div call, stripe_nr is the number of stripes |
