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Fix chunk allocation when some devices don't have enough room for the stripe

This commit is contained in:
Chris Mason 2008-04-18 11:56:21 -04:00 committed by David Woodhouse
parent 0e08036ee4
commit b569dafbf2
1 changed files with 30 additions and 19 deletions
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49
volumes.c
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@ -622,7 +622,7 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
struct list_head *dev_list = &extent_root->fs_info->fs_devices->devices;
struct list_head *cur;
struct map_lookup *map;
int min_chunk_size = 8 * 1024 * 1024;
int min_stripe_size = 1 * 1024 * 1024;
u64 physical;
u64 calc_size = 8 * 1024 * 1024;
u64 min_free;
@ -631,6 +631,7 @@ 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;
@ -646,17 +647,17 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
BTRFS_BLOCK_GROUP_RAID10 |
BTRFS_BLOCK_GROUP_DUP)) {
if (type & BTRFS_BLOCK_GROUP_SYSTEM) {
calc_size = 128 * 1024 * 1024;
max_chunk_size = 4 * calc_size;
min_chunk_size = 32 * 1024 * 1024;
calc_size = 8 * 1024 * 1024;
max_chunk_size = calc_size * 2;
min_stripe_size = 1 * 1024 * 1024;
} else if (type & BTRFS_BLOCK_GROUP_DATA) {
calc_size = 1024 * 1024 * 1024;
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) {
calc_size = 1024 * 1024 * 1024;
max_chunk_size = 4 * calc_size;
min_chunk_size = 64 * 1024 * 1024;
min_stripe_size = 32 * 1024 * 1024;
}
}
if (type & BTRFS_BLOCK_GROUP_RAID1) {
@ -664,39 +665,42 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
btrfs_super_num_devices(&info->super_copy));
if (num_stripes < 2)
return -ENOSPC;
min_stripes = 2;
}
if (type & BTRFS_BLOCK_GROUP_DUP)
if (type & BTRFS_BLOCK_GROUP_DUP) {
num_stripes = 2;
if (type & (BTRFS_BLOCK_GROUP_RAID0))
min_stripes = 2;
}
if (type & (BTRFS_BLOCK_GROUP_RAID0)) {
num_stripes = btrfs_super_num_devices(&info->super_copy);
min_stripes = 2;
}
if (type & (BTRFS_BLOCK_GROUP_RAID10)) {
num_stripes = btrfs_super_num_devices(&info->super_copy);
if (num_stripes < 4)
return -ENOSPC;
num_stripes &= ~(u32)1;
sub_stripes = 2;
min_stripes = 4;
}
/* 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);
if (calc_size * num_stripes > max_chunk_size) {
again:
if (chunk_bytes_by_type(type, calc_size, num_stripes, sub_stripes) >
max_chunk_size) {
calc_size = max_chunk_size;
calc_size /= num_stripes;
calc_size /= stripe_len;
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, calc_size, min_stripe_size);
again:
calc_size /= stripe_len;
calc_size *= stripe_len;
INIT_LIST_HEAD(&private_devs);
cur = dev_list->next;
index = 0;
@ -711,19 +715,27 @@ again:
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 >= 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;
@ -731,7 +743,6 @@ again:
}
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,