Btrfs: move the R/O check out of btrfs_clean_one_deleted_snapshot()

If the fs is remounted to be R/O, it is unnecessary to call
btrfs_clean_one_deleted_snapshot(), so move the R/O check out of
this function. And besides that, it can make the check logic in the
caller more clear.

Cc: David Sterba <dsterba@suse.cz>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 06f2c01..5b9b4eb 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1699,6 +1699,15 @@ static int cleaner_kthread(void *arg)
                if (!mutex_trylock(&root->fs_info->cleaner_mutex))
                        goto sleep;
 
+               /*
+                * Avoid the problem that we change the status of the fs
+                * during the above check and trylock.
+                */
+               if (need_cleaner_sleep(root)) {
+                       mutex_unlock(&root->fs_info->cleaner_mutex);
+                       goto sleep;
+               }
+
                btrfs_run_delayed_iputs(root);
                again = btrfs_clean_one_deleted_snapshot(root);
                mutex_unlock(&root->fs_info->cleaner_mutex);

diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 0544587..f157752 100644 (file)
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -1885,11 +1885,6 @@ int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root)
        int ret;
        struct btrfs_fs_info *fs_info = root->fs_info;
 
-       if (fs_info->sb->s_flags & MS_RDONLY) {
-               pr_debug("btrfs: cleaner called for RO fs!\n");
-               return 0;
-       }
-
        spin_lock(&fs_info->trans_lock);
        if (list_empty(&fs_info->dead_roots)) {
                spin_unlock(&fs_info->trans_lock);