sysfs, kernfs: move mount core code to fs/kernfs/mount.c

Move core mount code to fs/kernfs/mount.c.  The respective
declarations in fs/sysfs/sysfs.h are moved to
fs/kernfs/kernfs-internal.h.

This is pure relocation.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 0 insertions, 152 deletions

diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c
index 5384732700ba..e7e3aa8e7b78 100644
--- a/fs/sysfs/mount.c
+++ b/fs/sysfs/mount.c
@@ -14,91 +14,14 @@
 
 #include <linux/fs.h>
 #include <linux/mount.h>
-#include <linux/pagemap.h>
 #include <linux/init.h>
-#include <linux/module.h>
-#include <linux/magic.h>
-#include <linux/slab.h>
 #include <linux/user_namespace.h>
 
 #include "sysfs.h"
 
-
-struct kmem_cache *sysfs_dir_cachep;
-
-static const struct super_operations sysfs_ops = {
-        .statfs         = simple_statfs,
-        .drop_inode     = generic_delete_inode,
-        .evict_inode    = sysfs_evict_inode,
-};
-
 static struct kernfs_root *sysfs_root;
 struct sysfs_dirent *sysfs_root_sd;
 
-static int sysfs_fill_super(struct super_block *sb)
-{
-        struct sysfs_super_info *info = sysfs_info(sb);
-        struct inode *inode;
-        struct dentry *root;
-
-        sb->s_blocksize = PAGE_CACHE_SIZE;
-        sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
-        sb->s_magic = SYSFS_MAGIC;
-        sb->s_op = &sysfs_ops;
-        sb->s_time_gran = 1;
-
-        /* get root inode, initialize and unlock it */
-        mutex_lock(&sysfs_mutex);
-        inode = sysfs_get_inode(sb, info->root->sd);
-        mutex_unlock(&sysfs_mutex);
-        if (!inode) {
-                pr_debug("sysfs: could not get root inode\n");
-                return -ENOMEM;
-        }
-
-        /* instantiate and link root dentry */
-        root = d_make_root(inode);
-        if (!root) {
-                pr_debug("%s: could not get root dentry!\n", __func__);
-                return -ENOMEM;
-        }
-        kernfs_get(info->root->sd);
-        root->d_fsdata = info->root->sd;
-        sb->s_root = root;
-        sb->s_d_op = &sysfs_dentry_ops;
-        return 0;
-}
-
-static int sysfs_test_super(struct super_block *sb, void *data)
-{
-        struct sysfs_super_info *sb_info = sysfs_info(sb);
-        struct sysfs_super_info *info = data;
-
-        return sb_info->root == info->root && sb_info->ns == info->ns;
-}
-
-static int sysfs_set_super(struct super_block *sb, void *data)
-{
-        int error;
-        error = set_anon_super(sb, data);
-        if (!error)
-                sb->s_fs_info = data;
-        return error;
-}
-
-/**
- * kernfs_super_ns - determine the namespace tag of a kernfs super_block
- * @sb: super_block of interest
- *
- * Return the namespace tag associated with kernfs super_block @sb.
- */
-const void *kernfs_super_ns(struct super_block *sb)
-{
-        struct sysfs_super_info *info = sysfs_info(sb);
-
-        return info->ns;
-}
-
 static struct dentry *sysfs_mount(struct file_system_type *fs_type,
         int flags, const char *dev_name, void *data)
 {
@@ -120,79 +43,12 @@ static struct dentry *sysfs_mount(struct file_system_type *fs_type,
         return root;
 }
 
-/**
- * kernfs_mount_ns - kernfs mount helper
- * @fs_type: file_system_type of the fs being mounted
- * @flags: mount flags specified for the mount
- * @root: kernfs_root of the hierarchy being mounted
- * @ns: optional namespace tag of the mount
- *
- * This is to be called from each kernfs user's file_system_type->mount()
- * implementation, which should pass through the specified @fs_type and
- * @flags, and specify the hierarchy and namespace tag to mount via @root
- * and @ns, respectively.
- *
- * The return value can be passed to the vfs layer verbatim.
- */
-struct dentry *kernfs_mount_ns(struct file_system_type *fs_type, int flags,
-                               struct kernfs_root *root, const void *ns)
-{
-        struct super_block *sb;
-        struct sysfs_super_info *info;
-        int error;
-
-        info = kzalloc(sizeof(*info), GFP_KERNEL);
-        if (!info)
-                return ERR_PTR(-ENOMEM);
-
-        info->root = root;
-        info->ns = ns;
-
-        sb = sget(fs_type, sysfs_test_super, sysfs_set_super, flags, info);
-        if (IS_ERR(sb) || sb->s_fs_info != info)
-                kfree(info);
-        if (IS_ERR(sb))
-                return ERR_CAST(sb);
-        if (!sb->s_root) {
-                error = sysfs_fill_super(sb);
-                if (error) {
-                        deactivate_locked_super(sb);
-                        return ERR_PTR(error);
-                }
-                sb->s_flags |= MS_ACTIVE;
-        }
-
-        return dget(sb->s_root);
-}
-
 static void sysfs_kill_sb(struct super_block *sb)
 {
         kernfs_kill_sb(sb);
         kobj_ns_drop(KOBJ_NS_TYPE_NET, (void *)kernfs_super_ns(sb));
 }
 
-/**
- * kernfs_kill_sb - kill_sb for kernfs
- * @sb: super_block being killed
- *
- * This can be used directly for file_system_type->kill_sb().  If a kernfs
- * user needs extra cleanup, it can implement its own kill_sb() and call
- * this function at the end.
- */
-void kernfs_kill_sb(struct super_block *sb)
-{
-        struct sysfs_super_info *info = sysfs_info(sb);
-        struct sysfs_dirent *root_sd = sb->s_root->d_fsdata;
-
-        /*
-         * Remove the superblock from fs_supers/s_instances
-         * so we can't find it, before freeing sysfs_super_info.
-         */
-        kill_anon_super(sb);
-        kfree(info);
-        kernfs_put(root_sd);
-}
-
 static struct file_system_type sysfs_fs_type = {
         .name           = "sysfs",
         .mount          = sysfs_mount,
@@ -200,14 +56,6 @@ static struct file_system_type sysfs_fs_type = {
         .fs_flags       = FS_USERNS_MOUNT,
 };
 
-void __init kernfs_init(void)
-{
-        sysfs_dir_cachep = kmem_cache_create("sysfs_dir_cache",
-                                              sizeof(struct sysfs_dirent),
-                                              0, SLAB_PANIC, NULL);
-        sysfs_inode_init();
-}
-
 int __init sysfs_init(void)
 {
         int err;