[PATCH 8/9] z3fold: remove the z3fold file system

[Christoph Hellwig]

Just use the generic anon_inode file system.

Signed-off-by: Christoph Hellwig <h...@lst.de>
---
 mm/z3fold.c | 38 ++------------------------------------
 1 file changed, 2 insertions(+), 36 deletions(-)

diff --git a/mm/z3fold.c b/mm/z3fold.c
index e7cd9298b221f5..e0749a3d8987de 100644
--- a/mm/z3fold.c
+++ b/mm/z3fold.c
@@ -23,6 +23,7 @@
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
+#include <linux/anon_inodes.h>
 #include <linux/atomic.h>
 #include <linux/sched.h>
 #include <linux/cpumask.h>
@@ -345,38 +346,10 @@ static inline void free_handle(unsigned long handle, 
struct z3fold_header *zhdr)
        }
 }
 
-static int z3fold_init_fs_context(struct fs_context *fc)
-{
-       return init_pseudo(fc, Z3FOLD_MAGIC) ? 0 : -ENOMEM;
-}
-
-static struct file_system_type z3fold_fs = {
-       .name           = "z3fold",
-       .init_fs_context = z3fold_init_fs_context,
-       .kill_sb        = kill_anon_super,
-};
-
-static struct vfsmount *z3fold_mnt;
-static int z3fold_mount(void)
-{
-       int ret = 0;
-
-       z3fold_mnt = kern_mount(&z3fold_fs);
-       if (IS_ERR(z3fold_mnt))
-               ret = PTR_ERR(z3fold_mnt);
-
-       return ret;
-}
-
-static void z3fold_unmount(void)
-{
-       kern_unmount(z3fold_mnt);
-}
-
 static const struct address_space_operations z3fold_aops;
 static int z3fold_register_migration(struct z3fold_pool *pool)
 {
-       pool->inode = alloc_anon_inode_sb(z3fold_mnt->mnt_sb);
+       pool->inode = alloc_anon_inode();
        if (IS_ERR(pool->inode)) {
                pool->inode = NULL;
                return 1;
@@ -1787,22 +1760,15 @@ MODULE_ALIAS("zpool-z3fold");
 
 static int __init init_z3fold(void)
 {
-       int ret;
-
        /* Make sure the z3fold header is not larger than the page size */
        BUILD_BUG_ON(ZHDR_SIZE_ALIGNED > PAGE_SIZE);
-       ret = z3fold_mount();
-       if (ret)
-               return ret;
 
        zpool_register_driver(&z3fold_zpool_driver);
-
        return 0;
 }
 
 static void __exit exit_z3fold(void)
 {
-       z3fold_unmount();
        zpool_unregister_driver(&z3fold_zpool_driver);
 }
 
-- 
2.30.1