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Btrfs: sort raid_map before adding tgtdev stripes 

It can avoid complex calculation of real stripes in sort,
moreover, we can clean up code of sorting tgtdev_map because it
will be in order initially.

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Zhao Lei 2015-01-20 15:11:32 +08:00 committed by Chris Mason
parent e34c330d63
commit cc7539edea
1 changed files with 8 additions and 14 deletions
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22
fs/btrfs/volumes.c
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@ -4876,18 +4876,17 @@ static inline int parity_smaller(u64 a, u64 b)
}
/* Bubble-sort the stripe set to put the parity/syndrome stripes last */
static void sort_parity_stripes(struct btrfs_bio *bbio, u64 *raid_map)
static void sort_parity_stripes(struct btrfs_bio *bbio, u64 *raid_map,
int num_stripes)
{
struct btrfs_bio_stripe s;
int real_stripes = bbio->num_stripes - bbio->num_tgtdevs;
int i;
u64 l;
int again = 1;
int m;
while (again) {
again = 0;
for (i = 0; i < real_stripes - 1; i++) {
for (i = 0; i < num_stripes - 1; i++) {
if (parity_smaller(raid_map[i], raid_map[i+1])) {
s = bbio->stripes[i];
l = raid_map[i];
@ -4896,13 +4895,6 @@ static void sort_parity_stripes(struct btrfs_bio *bbio, u64 *raid_map)
bbio->stripes[i+1] = s;
raid_map[i+1] = l;
if (bbio->tgtdev_map) {
m = bbio->tgtdev_map[i];
bbio->tgtdev_map[i] =
bbio->tgtdev_map[i + 1];
bbio->tgtdev_map[i + 1] = m;
}
again = 1;
}
}
@ -5340,6 +5332,9 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
if (rw & (REQ_WRITE | REQ_GET_READ_MIRRORS))
max_errors = btrfs_chunk_max_errors(map);
if (raid_map)
sort_parity_stripes(bbio, raid_map, num_stripes);
tgtdev_indexes = 0;
if (dev_replace_is_ongoing && (rw & (REQ_WRITE | REQ_DISCARD)) &&
dev_replace->tgtdev != NULL) {
@ -5443,10 +5438,9 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
bbio->stripes[0].physical = physical_to_patch_in_first_stripe;
bbio->mirror_num = map->num_stripes + 1;
}
if (raid_map) {
sort_parity_stripes(bbio, raid_map);
if (raid_map_ret)
*raid_map_ret = raid_map;
}
out:
if (dev_replace_is_ongoing)
btrfs_dev_replace_unlock(dev_replace);