Btrfs: make the snap/subv deletion end more early when the fs is R/O

[mirror_ubuntu-artful-kernel.git] / fs / btrfs / ctree.h

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index d354de31b81b15cca6c86e55e6179d4280db38eb..d9ff585aadba851052220cba837e705181af96a6 100644 (file)
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -3318,6 +3318,18 @@ static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
        smp_mb();
        return fs_info->closing;
 }
+
+/*
+ * If we remount the fs to be R/O or umount the fs, the cleaner needn't do
+ * anything except sleeping. This function is used to check the status of
+ * the fs.
+ */
+static inline int btrfs_need_cleaner_sleep(struct btrfs_root *root)
+{
+       return (root->fs_info->sb->s_flags & MS_RDONLY ||
+               btrfs_fs_closing(root->fs_info));
+}
+
 static inline void free_fs_info(struct btrfs_fs_info *fs_info)
 {
        kfree(fs_info->balance_ctl);