Btrfs: skip commit transaction if we don't have enough pinned bytes

We commit transaction in order to reclaim space from pinned bytes because
it could process delayed refs, and in may_commit_transaction(), we check
first if pinned bytes are enough for the required space, we then check if
that plus bytes reserved for delayed insert are enough for the required
space.

This changes the code to the above logic.

Fixes: b150a4f10d87 ("Btrfs: use a percpu to keep track of possibly pinned bytes")
Tested-by: Nikolay Borisov <nborisov@suse.com>
Reported-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 87eab8f..da8e49e 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -4854,7 +4854,7 @@ static int may_commit_transaction(struct btrfs_fs_info *fs_info,
 
        spin_lock(&delayed_rsv->lock);
        if (percpu_counter_compare(&space_info->total_bytes_pinned,
-                                  bytes - delayed_rsv->size) >= 0) {
+                                  bytes - delayed_rsv->size) < 0) {
                spin_unlock(&delayed_rsv->lock);
                return -ENOSPC;
        }