1 files changed, 7 insertions, 1 deletions

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 3f1f4e2dc78f..2375f94fb780 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -1696,7 +1696,11 @@ static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
         struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
         int ret;
 
-        /* holding chunk_muext to avoid allocating new chunks */
+        /*
+         * holding chunk_muext to avoid allocating new chunks, holding
+         * device_list_mutex to avoid the device being removed
+         */
+        mutex_lock(&fs_info->fs_devices->device_list_mutex);
         mutex_lock(&fs_info->chunk_mutex);
         rcu_read_lock();
         list_for_each_entry_rcu(found, head, list) {
@@ -1737,11 +1741,13 @@ static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
         ret = btrfs_calc_avail_data_space(fs_info->tree_root, &total_free_data);
         if (ret) {
                 mutex_unlock(&fs_info->chunk_mutex);
+                mutex_unlock(&fs_info->fs_devices->device_list_mutex);
                 return ret;
         }
         buf->f_bavail += div_u64(total_free_data, factor);
         buf->f_bavail = buf->f_bavail >> bits;
         mutex_unlock(&fs_info->chunk_mutex);
+        mutex_unlock(&fs_info->fs_devices->device_list_mutex);
 
         buf->f_type = BTRFS_SUPER_MAGIC;
         buf->f_bsize = dentry->d_sb->s_blocksize;