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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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10
fs/btrfs/ctree.h
View File

@ -953,7 +953,15 @@ struct btrfs_dev_replace_item {
#define BTRFS_BLOCK_GROUP_DUP (1ULL << 5)
#define BTRFS_BLOCK_GROUP_RAID10 (1ULL << 6)
#define BTRFS_BLOCK_GROUP_RESERVED BTRFS_AVAIL_ALLOC_BIT_SINGLE
#define BTRFS_NR_RAID_TYPES 5
enum btrfs_raid_types {
BTRFS_RAID_RAID10,
BTRFS_RAID_RAID1,
BTRFS_RAID_DUP,
BTRFS_RAID_RAID0,
BTRFS_RAID_SINGLE,
BTRFS_NR_RAID_TYPES
};
#define BTRFS_BLOCK_GROUP_TYPE_MASK (BTRFS_BLOCK_GROUP_DATA | \
BTRFS_BLOCK_GROUP_SYSTEM | \

22
fs/btrfs/extent-tree.c
View File

@ -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);
}

47
fs/btrfs/volumes.c
View File

@ -3562,13 +3562,48 @@ static int btrfs_cmp_device_info(const void *a, const void *b)
}
struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES] = {
{ 2, 1, 0, 4, 2, 2 /* raid10 */ },
{ 1, 1, 2, 2, 2, 2 /* raid1 */ },
{ 1, 2, 1, 1, 1, 2 /* dup */ },
{ 1, 1, 0, 2, 1, 1 /* raid0 */ },
{ 1, 1, 1, 1, 1, 1 /* single */ },
[BTRFS_RAID_RAID10] = {
.sub_stripes = 2,
.dev_stripes = 1,
.devs_max = 0, /* 0 == as many as possible */
.devs_min = 4,
.devs_increment = 2,
.ncopies = 2,
},
[BTRFS_RAID_RAID1] = {
.sub_stripes = 1,
.dev_stripes = 1,
.devs_max = 2,
.devs_min = 2,
.devs_increment = 2,
.ncopies = 2,
},
[BTRFS_RAID_DUP] = {
.sub_stripes = 1,
.dev_stripes = 2,
.devs_max = 1,
.devs_min = 1,
.devs_increment = 1,
.ncopies = 2,
},
[BTRFS_RAID_RAID0] = {
.sub_stripes = 1,
.dev_stripes = 1,
.devs_max = 0,
.devs_min = 2,
.devs_increment = 1,
.ncopies = 1,
},
[BTRFS_RAID_SINGLE] = {
.sub_stripes = 1,
.dev_stripes = 1,
.devs_max = 1,
.devs_min = 1,
.devs_increment = 1,
.ncopies = 1,
},
};
static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
struct btrfs_root *extent_root,
struct map_lookup **map_ret,