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Btrfs: Tune stripe selection for raid1 and raid10

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2008-04-29 14:12:09 -04:00
parent a236aed14c
commit 2fff734faf
1 changed files with 7 additions and 10 deletions
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17
fs/btrfs/volumes.c
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@@ -1509,17 +1509,17 @@ again:
if (map->type & BTRFS_BLOCK_GROUP_RAID1) { if (map->type & BTRFS_BLOCK_GROUP_RAID1) {
if (unplug_page || (rw & (1 << BIO_RW))) if (unplug_page || (rw & (1 << BIO_RW)))
num_stripes = map->num_stripes; num_stripes = map->num_stripes;
else if (mirror_num) { else if (mirror_num)
stripe_index = mirror_num - 1; stripe_index = mirror_num - 1;
} else { else
u64 orig_stripe_nr = stripe_nr; stripe_index = current->pid % map->num_stripes;
stripe_index = do_div(orig_stripe_nr, num_stripes);
}
} else if (map->type & BTRFS_BLOCK_GROUP_DUP) { } else if (map->type & BTRFS_BLOCK_GROUP_DUP) {
if (rw & (1 << BIO_RW)) if (rw & (1 << BIO_RW))
num_stripes = map->num_stripes; num_stripes = map->num_stripes;
else if (mirror_num) else if (mirror_num)
stripe_index = mirror_num - 1; stripe_index = mirror_num - 1;
} else if (map->type & BTRFS_BLOCK_GROUP_RAID10) { } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
int factor = map->num_stripes / map->sub_stripes; int factor = map->num_stripes / map->sub_stripes;
@@ -1530,11 +1530,8 @@ again:
num_stripes = map->sub_stripes; num_stripes = map->sub_stripes;
else if (mirror_num) else if (mirror_num)
stripe_index += mirror_num - 1; stripe_index += mirror_num - 1;
else { else
u64 orig_stripe_nr = stripe_nr; stripe_index += current->pid % map->sub_stripes;
stripe_index += do_div(orig_stripe_nr,
map->sub_stripes);
}
} else { } else {
/* /*
* after this do_div call, stripe_nr is the number of stripes * after this do_div call, stripe_nr is the number of stripes