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Btrfs: account for space used by the super mirrors

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As we get closer to proper -ENOSPC handling in btrfs, we need more accurate
space accounting for the space info's.  Currently we exclude the free space for
the super mirrors, but the space they take up isn't accounted for in any of the
counters.  This patch introduces bytes_super, which keeps track of the amount
of bytes used for a super mirror in the block group cache and space info.  This
makes sure that our free space caclucations will be completely accurate.

Signed-off-by: Josef Bacik <jbacik@redhat.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Josef Bacik
2009-09-11 16:11:20 -04:00
committed by Chris Mason
parent 25891f796d
commit 1b2da372b0
2 changed files with 20 additions and 2 deletions
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20
fs/btrfs/extent-tree.c
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@@ -201,6 +201,7 @@ static int exclude_super_stripes(struct btrfs_root *root,
BUG_ON(ret);
while (nr--) {
cache->bytes_super += stripe_len;
ret = add_excluded_extent(root, logical[nr],
stripe_len);
BUG_ON(ret);
@@ -295,6 +296,9 @@ static int caching_kthread(void *data)
return -ENOMEM;
exclude_super_stripes(extent_root, block_group);
spin_lock(&block_group->space_info->lock);
block_group->space_info->bytes_super += block_group->bytes_super;
spin_unlock(&block_group->space_info->lock);
last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET);
@@ -2785,7 +2789,8 @@ again:
do_div(thresh, 100);
if (meta_sinfo->bytes_used + meta_sinfo->bytes_reserved +
meta_sinfo->bytes_pinned + meta_sinfo->bytes_readonly > thresh) {
meta_sinfo->bytes_pinned + meta_sinfo->bytes_readonly +
meta_sinfo->bytes_super > thresh) {
struct btrfs_trans_handle *trans;
if (!meta_sinfo->full) {
meta_sinfo->force_alloc = 1;
@@ -2839,7 +2844,7 @@ again:
if (data_sinfo->total_bytes - data_sinfo->bytes_used -
data_sinfo->bytes_delalloc - data_sinfo->bytes_reserved -
data_sinfo->bytes_pinned - data_sinfo->bytes_readonly -
data_sinfo->bytes_may_use < bytes) {
data_sinfo->bytes_may_use - data_sinfo->bytes_super < bytes) {
struct btrfs_trans_handle *trans;
/*
@@ -6957,8 +6962,10 @@ int btrfs_read_block_groups(struct btrfs_root *root)
* time, particularly in the full case.
*/
if (found_key.offset == btrfs_block_group_used(&cache->item)) {
exclude_super_stripes(root, cache);
cache->last_byte_to_unpin = (u64)-1;
cache->cached = BTRFS_CACHE_FINISHED;
free_excluded_extents(root, cache);
} else if (btrfs_block_group_used(&cache->item) == 0) {
exclude_super_stripes(root, cache);
cache->last_byte_to_unpin = (u64)-1;
@@ -6975,6 +6982,10 @@ int btrfs_read_block_groups(struct btrfs_root *root)
&space_info);
BUG_ON(ret);
cache->space_info = space_info;
spin_lock(&cache->space_info->lock);
cache->space_info->bytes_super += cache->bytes_super;
spin_unlock(&cache->space_info->lock);
down_write(&space_info->groups_sem);
list_add_tail(&cache->list, &space_info->block_groups);
up_write(&space_info->groups_sem);
@@ -7044,6 +7055,11 @@ int btrfs_make_block_group(struct btrfs_trans_handle *trans,
ret = update_space_info(root->fs_info, cache->flags, size, bytes_used,
&cache->space_info);
BUG_ON(ret);
spin_lock(&cache->space_info->lock);
cache->space_info->bytes_super += cache->bytes_super;
spin_unlock(&cache->space_info->lock);
down_write(&cache->space_info->groups_sem);
list_add_tail(&cache->list, &cache->space_info->block_groups);
up_write(&cache->space_info->groups_sem);