#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 | \
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)
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);
}
}
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,