Btrfs: fix deadlock running delayed iputs at transaction commit time

[firefly-linux-kernel-4.4.55.git] / fs / btrfs / disk-io.c

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 4958360a44f778a57142f91b4c1fcbd0604907c7..41fb43183406c944086ca6eefaf10c7f5a35880e 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1796,7 +1796,10 @@ static int cleaner_kthread(void *arg)
                        goto sleep;
                }
 
+               mutex_lock(&root->fs_info->cleaner_delayed_iput_mutex);
                btrfs_run_delayed_iputs(root);
+               mutex_unlock(&root->fs_info->cleaner_delayed_iput_mutex);
+
                again = btrfs_clean_one_deleted_snapshot(root);
                mutex_unlock(&root->fs_info->cleaner_mutex);
 
@@ -2556,8 +2559,8 @@ int open_ctree(struct super_block *sb,
        mutex_init(&fs_info->delete_unused_bgs_mutex);
        mutex_init(&fs_info->reloc_mutex);
        mutex_init(&fs_info->delalloc_root_mutex);
+       mutex_init(&fs_info->cleaner_delayed_iput_mutex);
        seqlock_init(&fs_info->profiles_lock);
-       init_rwsem(&fs_info->delayed_iput_sem);
 
        INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
        INIT_LIST_HEAD(&fs_info->space_info);