Btrfs: Shrink delay allocated space in a synchronized
Shrink delayed allocation space in a synchronized manner is more
controllable than flushing all delay allocated space in an async
thread.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 2bfdc64..d53cad1 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -5611,6 +5611,38 @@
return 0;
}
+int btrfs_start_one_delalloc_inode(struct btrfs_root *root, int delay_iput)
+{
+ struct btrfs_inode *binode;
+ struct inode *inode = NULL;
+
+ spin_lock(&root->fs_info->delalloc_lock);
+ while (!list_empty(&root->fs_info->delalloc_inodes)) {
+ binode = list_entry(root->fs_info->delalloc_inodes.next,
+ struct btrfs_inode, delalloc_inodes);
+ inode = igrab(&binode->vfs_inode);
+ if (inode) {
+ list_move_tail(&binode->delalloc_inodes,
+ &root->fs_info->delalloc_inodes);
+ break;
+ }
+
+ list_del_init(&binode->delalloc_inodes);
+ cond_resched_lock(&root->fs_info->delalloc_lock);
+ }
+ spin_unlock(&root->fs_info->delalloc_lock);
+
+ if (inode) {
+ write_inode_now(inode, 0);
+ if (delay_iput)
+ btrfs_add_delayed_iput(inode);
+ else
+ iput(inode);
+ return 1;
+ }
+ return 0;
+}
+
static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
const char *symname)
{