fs: deduplicate noop_backing_dev_info

hugetlbfs, kernfs and dlmfs can simply use noop_backing_dev_info instead
of creating a local duplicate.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@fb.com>

1 files changed, 1 insertions, 13 deletions

diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 5eba47f593f8..de7c95c7d840 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -62,12 +62,6 @@ static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 }
 
-static struct backing_dev_info hugetlbfs_backing_dev_info = {
-        .name           = "hugetlbfs",
-        .ra_pages       = 0,    /* No readahead */
-        .capabilities   = BDI_CAP_NO_ACCT_AND_WRITEBACK,
-};
-
 int sysctl_hugetlb_shm_group;
 
 enum {
@@ -498,7 +492,7 @@ static struct inode *hugetlbfs_get_inode(struct super_block *sb,
                 lockdep_set_class(&inode->i_mapping->i_mmap_rwsem,
                                 &hugetlbfs_i_mmap_rwsem_key);
                 inode->i_mapping->a_ops = &hugetlbfs_aops;
-                inode->i_mapping->backing_dev_info =&hugetlbfs_backing_dev_info;
+                inode->i_mapping->backing_dev_info = &noop_backing_dev_info;
                 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
                 inode->i_mapping->private_data = resv_map;
                 info = HUGETLBFS_I(inode);
@@ -1032,10 +1026,6 @@ static int __init init_hugetlbfs_fs(void)
                 return -ENOTSUPP;
         }
 
-        error = bdi_init(&hugetlbfs_backing_dev_info);
-        if (error)
-                return error;
-
         error = -ENOMEM;
         hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache",
                                         sizeof(struct hugetlbfs_inode_info),
@@ -1071,7 +1061,6 @@ static int __init init_hugetlbfs_fs(void)
  out:
         kmem_cache_destroy(hugetlbfs_inode_cachep);
  out2:
-        bdi_destroy(&hugetlbfs_backing_dev_info);
         return error;
 }
 
@@ -1091,7 +1080,6 @@ static void __exit exit_hugetlbfs_fs(void)
         for_each_hstate(h)
                 kern_unmount(hugetlbfs_vfsmount[i++]);
         unregister_filesystem(&hugetlbfs_fs_type);
-        bdi_destroy(&hugetlbfs_backing_dev_info);
 }
 
 module_init(init_hugetlbfs_fs)