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Btrfs: Fix chunk allocation when some devices don't have enough room for stripes

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-04-18 11:55:51 -04:00
parent 9b3f68b906
commit a40a90a042
1 changed files with 29 additions and 16 deletions
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45
fs/btrfs/volumes.c
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@ -664,7 +664,7 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
struct extent_map_tree *em_tree;
struct map_lookup *map;
struct extent_map *em;
int min_chunk_size = 8 * 1024 * 1024;
int min_stripe_size = 1 * 1024 * 1024;
u64 physical;
u64 calc_size = 1024 * 1024 * 1024;
u64 max_chunk_size = calc_size;
@ -673,6 +673,7 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
u64 max_avail = 0;
u64 percent_max;
int num_stripes = 1;
int min_stripes = 1;
int sub_stripes = 0;
int looped = 0;
int ret;
@ -683,15 +684,20 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
if (list_empty(dev_list))
return -ENOSPC;
if (type & (BTRFS_BLOCK_GROUP_RAID0))
if (type & (BTRFS_BLOCK_GROUP_RAID0)) {
num_stripes = btrfs_super_num_devices(&info->super_copy);
if (type & (BTRFS_BLOCK_GROUP_DUP))
min_stripes = 2;
}
if (type & (BTRFS_BLOCK_GROUP_DUP)) {
num_stripes = 2;
min_stripes = 2;
}
if (type & (BTRFS_BLOCK_GROUP_RAID1)) {
num_stripes = min_t(u64, 2,
btrfs_super_num_devices(&info->super_copy));
if (num_stripes < 2)
return -ENOSPC;
min_stripes = 2;
}
if (type & (BTRFS_BLOCK_GROUP_RAID10)) {
num_stripes = btrfs_super_num_devices(&info->super_copy);
@ -699,22 +705,26 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
return -ENOSPC;
num_stripes &= ~(u32)1;
sub_stripes = 2;
min_stripes = 4;
}
if (type & BTRFS_BLOCK_GROUP_DATA) {
max_chunk_size = 10 * calc_size;
min_chunk_size = 256 * 1024 * 1024;
min_stripe_size = 64 * 1024 * 1024;
} else if (type & BTRFS_BLOCK_GROUP_METADATA) {
max_chunk_size = 4 * calc_size;
min_chunk_size = 64 * 1024 * 1024;
} else {
min_chunk_size = 32 * 1024 * 1024;
min_stripe_size = 32 * 1024 * 1024;
} else if (type & BTRFS_BLOCK_GROUP_SYSTEM) {
calc_size = 8 * 1024 * 1024;
max_chunk_size = calc_size * 2;
min_stripe_size = 1 * 1024 * 1024;
}
/* we don't want a chunk larger than 10% of the FS */
percent_max = div_factor(btrfs_super_total_bytes(&info->super_copy), 1);
max_chunk_size = min(percent_max, max_chunk_size);
again:
if (calc_size * num_stripes > max_chunk_size) {
calc_size = max_chunk_size;
do_div(calc_size, num_stripes);
@ -722,12 +732,8 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
calc_size *= stripe_len;
}
/* we don't want tiny stripes */
*num_bytes = chunk_bytes_by_type(type, calc_size,
num_stripes, sub_stripes);
calc_size = max_t(u64, chunk_bytes_by_type(type, min_chunk_size,
num_stripes, sub_stripes), calc_size);
calc_size = max_t(u64, min_stripe_size, calc_size);
again:
do_div(calc_size, stripe_len);
calc_size *= stripe_len;
@ -746,19 +752,27 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
avail = device->total_bytes - device->bytes_used;
cur = cur->next;
if (avail > max_avail)
max_avail = avail;
if (avail >= min_free) {
list_move_tail(&device->dev_list, &private_devs);
index++;
if (type & BTRFS_BLOCK_GROUP_DUP)
index++;
}
} else if (avail > max_avail)
max_avail = avail;
if (cur == dev_list)
break;
}
if (index < num_stripes) {
list_splice(&private_devs, dev_list);
if (index >= min_stripes) {
num_stripes = index;
if (type & (BTRFS_BLOCK_GROUP_RAID10)) {
num_stripes /= sub_stripes;
num_stripes *= sub_stripes;
}
looped = 1;
goto again;
}
if (!looped && max_avail > 0) {
looped = 1;
calc_size = max_avail;
@ -766,7 +780,6 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
}
return -ENOSPC;
}
key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
key.type = BTRFS_CHUNK_ITEM_KEY;
ret = find_next_chunk(chunk_root, BTRFS_FIRST_CHUNK_TREE_OBJECTID,