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Btrfs: make raid attr array more readable 

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>
hifive-unleashed-5.1
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,