For some reason we're adding bytes_readonly to the space info after we update
the space info with the block group info. This creates a tiny race where we
could over-reserve space because we haven't yet taken out the bytes_readonly
bit. Since we already know this information at the time we call
update_space_info, just pass it along so it can be updated all at once. Thanks,
Signed-off-by: Josef Bacik <jba...@fb.com>
---
fs/btrfs/extent-tree.c | 29 +++++++++++------------------
1 file changed, 11 insertions(+), 18 deletions(-)
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 53e1297..c357c96 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3843,6 +3843,7 @@ static const char *alloc_name(u64 flags)
static int update_space_info(struct btrfs_fs_info *info, u64 flags,
u64 total_bytes, u64 bytes_used,
+ u64 bytes_readonly,
struct btrfs_space_info **space_info)
{
struct btrfs_space_info *found;
@@ -3863,6 +3864,7 @@ static int update_space_info(struct btrfs_fs_info *info,
u64 flags,
found->disk_total += total_bytes * factor;
found->bytes_used += bytes_used;
found->disk_used += bytes_used * factor;
+ found->bytes_readonly += bytes_readonly;
if (total_bytes > 0)
found->full = 0;
spin_unlock(&found->lock);
@@ -3890,7 +3892,7 @@ static int update_space_info(struct btrfs_fs_info *info,
u64 flags,
found->disk_used = bytes_used * factor;
found->bytes_pinned = 0;
found->bytes_reserved = 0;
- found->bytes_readonly = 0;
+ found->bytes_readonly = bytes_readonly;
found->bytes_may_use = 0;
found->full = 0;
found->max_extent_size = 0;
@@ -4400,7 +4402,7 @@ static int do_chunk_alloc(struct btrfs_trans_handle
*trans,
space_info = __find_space_info(extent_root->fs_info, flags);
if (!space_info) {
ret = update_space_info(extent_root->fs_info, flags,
- 0, 0, &space_info);
+ 0, 0, 0, &space_info);
BUG_ON(ret); /* -ENOMEM */
}
BUG_ON(!space_info); /* Logic error */
@@ -9862,7 +9864,7 @@ int btrfs_read_block_groups(struct btrfs_root *root)
ret = update_space_info(info, cache->flags, found_key.offset,
btrfs_block_group_used(&cache->item),
- &space_info);
+ cache->bytes_super, &space_info);
if (ret) {
btrfs_remove_free_space_cache(cache);
spin_lock(&info->block_group_cache_lock);
@@ -9875,9 +9877,6 @@ int btrfs_read_block_groups(struct btrfs_root *root)
}
cache->space_info = space_info;
- spin_lock(&cache->space_info->lock);
- cache->space_info->bytes_readonly += cache->bytes_super;
- spin_unlock(&cache->space_info->lock);
__link_block_group(space_info, cache);
@@ -9969,7 +9968,6 @@ int btrfs_make_block_group(struct btrfs_trans_handle
*trans,
int ret;
struct btrfs_root *extent_root;
struct btrfs_block_group_cache *cache;
-
extent_root = root->fs_info->extent_root;
btrfs_set_log_full_commit(root->fs_info, trans);
@@ -10015,7 +10013,7 @@ int btrfs_make_block_group(struct btrfs_trans_handle
*trans,
* assigned to our block group, but don't update its counters just yet.
* We want our bg to be added to the rbtree with its ->space_info set.
*/
- ret = update_space_info(root->fs_info, cache->flags, 0, 0,
+ ret = update_space_info(root->fs_info, cache->flags, 0, 0, 0,
&cache->space_info);
if (ret) {
btrfs_remove_free_space_cache(cache);
@@ -10035,7 +10033,7 @@ int btrfs_make_block_group(struct btrfs_trans_handle
*trans,
* the rbtree, update the space info's counters.
*/
ret = update_space_info(root->fs_info, cache->flags, size, bytes_used,
- &cache->space_info);
+ cache->bytes_super, &cache->space_info);
if (ret) {
btrfs_remove_free_space_cache(cache);
spin_lock(&root->fs_info->block_group_cache_lock);
@@ -10048,16 +10046,11 @@ int btrfs_make_block_group(struct btrfs_trans_handle
*trans,
}
update_global_block_rsv(root->fs_info);
- spin_lock(&cache->space_info->lock);
- cache->space_info->bytes_readonly += cache->bytes_super;
- spin_unlock(&cache->space_info->lock);
-
__link_block_group(cache->space_info, cache);
list_add_tail(&cache->bg_list, &trans->new_bgs);
set_avail_alloc_bits(extent_root->fs_info, type);
-
return 0;
}
@@ -10602,21 +10595,21 @@ int btrfs_init_space_info(struct btrfs_fs_info
*fs_info)
mixed = 1;
flags = BTRFS_BLOCK_GROUP_SYSTEM;
- ret = update_space_info(fs_info, flags, 0, 0, &space_info);
+ ret = update_space_info(fs_info, flags, 0, 0, 0, &space_info);
if (ret)
goto out;
if (mixed) {
flags = BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA;
- ret = update_space_info(fs_info, flags, 0, 0, &space_info);
+ ret = update_space_info(fs_info, flags, 0, 0, 0, &space_info);
} else {
flags = BTRFS_BLOCK_GROUP_METADATA;
- ret = update_space_info(fs_info, flags, 0, 0, &space_info);
+ ret = update_space_info(fs_info, flags, 0, 0, 0, &space_info);
if (ret)
goto out;
flags = BTRFS_BLOCK_GROUP_DATA;
- ret = update_space_info(fs_info, flags, 0, 0, &space_info);
+ ret = update_space_info(fs_info, flags, 0, 0, 0, &space_info);
}
out:
return ret;
--
2.5.0
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