Btrfs: make delalloc inodes be flushed by multi-task

This patch introduce a new worker pool named "flush_workers", and if we
want to force all the inode with pending delalloc to the disks, we can
queue those inodes into the work queue of the worker pool, in this way,
those inodes will be flushed by multi-task.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index 242d6de4d8eb..270f24ffe1be 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -4061,7 +4061,11 @@ int btrfs_relocate_block_group(struct btrfs_root *extent_root, u64 group_start)
                (unsigned long long)rc->block_group->key.objectid,
                (unsigned long long)rc->block_group->flags);
 
-        btrfs_start_delalloc_inodes(fs_info->tree_root, 0);
+        ret = btrfs_start_delalloc_inodes(fs_info->tree_root, 0);
+        if (ret < 0) {
+                err = ret;
+                goto out;
+        }
         btrfs_wait_ordered_extents(fs_info->tree_root, 0);
 
         while (1) {