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Btrfs: make raid attr array more readable

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The current code of raid attr arry is hard to understand and it is easy to
introduce some problem if we modify the array. So I changed it and made it
more readable.

Cc: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Miao Xie 2013-01-17 05:38:51 +00:00 • committed by Josef Bacik
parent a1897fddd2
commit e6ec716f0d
3 changed files with 59 additions and 20 deletions
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22
fs/btrfs/extent-tree.c
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@ -5545,20 +5545,16 @@ wait_block_group_cache_done(struct btrfs_block_group_cache *cache)
int __get_raid_index(u64 flags)
{
int index;
if (flags & BTRFS_BLOCK_GROUP_RAID10)
index = 0;
return BTRFS_RAID_RAID10;
else if (flags & BTRFS_BLOCK_GROUP_RAID1)
index = 1;
return BTRFS_RAID_RAID1;
else if (flags & BTRFS_BLOCK_GROUP_DUP)
index = 2;
return BTRFS_RAID_DUP;
else if (flags & BTRFS_BLOCK_GROUP_RAID0)
index = 3;
return BTRFS_RAID_RAID0;
else
index = 4;
return index;
return BTRFS_RAID_SINGLE;
}
static int get_block_group_index(struct btrfs_block_group_cache *cache)
@ -7518,16 +7514,16 @@ int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr)
index = get_block_group_index(block_group);
}
if (index == 0) {
if (index == BTRFS_RAID_RAID10) {
dev_min = 4;
/* Divide by 2 */
min_free >>= 1;
} else if (index == 1) {
} else if (index == BTRFS_RAID_RAID1) {
dev_min = 2;
} else if (index == 2) {
} else if (index == BTRFS_RAID_DUP) {
/* Multiply by 2 */
min_free <<= 1;
} else if (index == 3) {
} else if (index == BTRFS_RAID_RAID0) {
dev_min = fs_devices->rw_devices;
do_div(min_free, dev_min);
}