[PATCH 03/11] btrfs: Introduce unaccount_log_buffer

Nikolay Borisov
2020-01-20T14:09:25Z

This function correctly adjusts the reserved bytes occupied by a
log tree extent buffer. It will be used instead of calling
btrfs_pin_reserved_extent.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
---
fs/btrfs/tree-log.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)

diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index a2bae5c230e1..30e7d96a69fe 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -18,6 +18,8 @@
#include "compression.h"
#include "qgroup.h"
#include "inode-map.h"
+#include "block-group.h"
+#include "space-info.h"

/* magic values for the inode_only field in btrfs_log_inode:
*
@@ -2659,6 +2661,27 @@ static int replay_one_buffer(struct btrfs_root *log, struct extent_buffer *eb,
return ret;
}

+static void unaccount_log_buffer(struct btrfs_fs_info *fs_info, u64 start)
+{
+ struct btrfs_block_group *cache;
+
+ cache = btrfs_lookup_block_group(fs_info, start);
+ if (!cache) {
+ btrfs_err(fs_info, "unable to find block group for %llu", start);
+ return;
+ }
+
+ spin_lock(&cache->space_info->lock);
+ spin_lock(&cache->lock);
+ cache->reserved -= fs_info->nodesize;
+ cache->space_info->bytes_reserved -= fs_info->nodesize;
+ spin_unlock(&cache->lock);
+ spin_unlock(&cache->space_info->lock);
+
+ btrfs_put_block_group(cache);
+ return;
+}
+
static noinline int walk_down_log_tree(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path, int *level,
--
2.17.1