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Btrfs: Add support for duplicate blocks on a single spindle 

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-04-03 16:29:03 -04:00
parent 8790d502e4
commit 611f0e00a2
4 changed files with 37 additions and 9 deletions
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1
fs/btrfs/ctree.h
View File

@ -419,6 +419,7 @@ struct btrfs_csum_item {
#define BTRFS_BLOCK_GROUP_METADATA (1 << 2)
#define BTRFS_BLOCK_GROUP_RAID0 (1 << 3)
#define BTRFS_BLOCK_GROUP_RAID1 (1 << 4)
#define BTRFS_BLOCK_GROUP_DUP (1 << 5)
struct btrfs_block_group_item {

8
fs/btrfs/disk-io.c
View File

@ -913,9 +913,11 @@ struct btrfs_root *open_ctree(struct super_block *sb,
fs_info->generation = btrfs_super_generation(disk_super) + 1;
if (btrfs_super_num_devices(disk_super) > 0) {
fs_info->data_alloc_profile = BTRFS_BLOCK_GROUP_RAID0;
fs_info->metadata_alloc_profile = BTRFS_BLOCK_GROUP_RAID1;
fs_info->system_alloc_profile = BTRFS_BLOCK_GROUP_RAID0;
fs_info->data_alloc_profile = BTRFS_BLOCK_GROUP_RAID0 |
BTRFS_BLOCK_GROUP_RAID1;
fs_info->metadata_alloc_profile = BTRFS_BLOCK_GROUP_RAID1 |
BTRFS_BLOCK_GROUP_DUP;
fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
}
mutex_unlock(&fs_info->fs_mutex);
return tree_root;

5
fs/btrfs/extent-tree.c
View File

@ -231,7 +231,7 @@ again:
if (start + num > total_fs_bytes)
goto new_group;
if (!block_group_bits(cache, data)) {
printk("block group bits don't match %Lu %Lu\n", cache->flags, data);
printk("block group bits don't match %Lu %d\n", cache->flags, data);
}
*start_ret = start;
return 0;
@ -1048,7 +1048,8 @@ static int update_space_info(struct btrfs_fs_info *info, u64 flags,
static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags)
{
u64 extra_flags = flags & (BTRFS_BLOCK_GROUP_RAID0 |
BTRFS_BLOCK_GROUP_RAID1);
BTRFS_BLOCK_GROUP_RAID1 |
BTRFS_BLOCK_GROUP_DUP);
if (extra_flags) {
if (flags & BTRFS_BLOCK_GROUP_DATA)
fs_info->avail_data_alloc_bits |= extra_flags;

32
fs/btrfs/volumes.c
View File

@ -627,6 +627,7 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
struct extent_map *em;
u64 physical;
u64 calc_size = 1024 * 1024 * 1024;
u64 min_free = calc_size;
u64 avail;
u64 max_avail = 0;
int num_stripes = 1;
@ -641,6 +642,8 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
if (type & (BTRFS_BLOCK_GROUP_RAID0))
num_stripes = btrfs_super_num_devices(&info->super_copy);
if (type & (BTRFS_BLOCK_GROUP_DUP))
num_stripes = 2;
if (type & (BTRFS_BLOCK_GROUP_RAID1)) {
num_stripes = min_t(u64, 2,
btrfs_super_num_devices(&info->super_copy));
@ -649,16 +652,23 @@ again:
INIT_LIST_HEAD(&private_devs);
cur = dev_list->next;
index = 0;
if (type & BTRFS_BLOCK_GROUP_DUP)
min_free = calc_size * 2;
/* build a private list of devices we will allocate from */
while(index < num_stripes) {
device = list_entry(cur, struct btrfs_device, dev_list);
avail = device->total_bytes - device->bytes_used;
cur = cur->next;
if (avail > max_avail)
max_avail = avail;
if (avail >= calc_size) {
if (avail >= min_free) {
list_move_tail(&device->dev_list, &private_devs);
index++;
if (type & BTRFS_BLOCK_GROUP_DUP)
index++;
}
if (cur == dev_list)
break;
@ -689,17 +699,22 @@ again:
stripes = &chunk->stripe;
if (type & BTRFS_BLOCK_GROUP_RAID1)
if (type & (BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_DUP))
*num_bytes = calc_size;
else
*num_bytes = calc_size * num_stripes;
index = 0;
printk("new chunk type %Lu start %Lu size %Lu\n", type, key.objectid, *num_bytes);
while(index < num_stripes) {
BUG_ON(list_empty(&private_devs));
cur = private_devs.next;
device = list_entry(cur, struct btrfs_device, dev_list);
list_move_tail(&device->dev_list, dev_list);
/* loop over this device again if we're doing a dup group */
if (!(type & BTRFS_BLOCK_GROUP_DUP) ||
(index == num_stripes - 1))
list_move_tail(&device->dev_list, dev_list);
ret = btrfs_alloc_dev_extent(trans, device,
key.objectid,
@ -839,6 +854,14 @@ int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
}
*total_devs = 1;
}
} else if (map->type & BTRFS_BLOCK_GROUP_DUP) {
if (rw == WRITE) {
*total_devs = map->num_stripes;
stripe_index = dev_nr;
} else {
stripe_index = 0;
*total_devs = 1;
}
} else {
/*
* after this do_div call, stripe_nr is the number of stripes
@ -851,7 +874,8 @@ int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
*phys = map->stripes[stripe_index].physical + stripe_offset +
stripe_nr * map->stripe_len;
if (map->type & (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1)) {
if (map->type & (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
BTRFS_BLOCK_GROUP_DUP)) {
/* we limit the length of each bio to what fits in a stripe */
*length = min_t(u64, em->len - offset,
map->stripe_len - stripe_offset);