vfs: split off vfsmount-related parts of vfs_kern_mount()

new function: mount_fs().  Does all work done by vfs_kern_mount()
except the allocation and filling of vfsmount; returns root dentry
or ERR_PTR().

vfs_kern_mount() switched to using it and taken to fs/namespace.c,
along with its wrappers.

alloc_vfsmnt()/free_vfsmnt() made static.

functions in namespace.c slightly reordered.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 113 insertions, 40 deletions

diff --git a/fs/namespace.c b/fs/namespace.c
index a2a01a104ab0..453529f72dff 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -196,7 +196,7 @@ unsigned int mnt_get_count(struct vfsmount *mnt)
 #endif
 }
 
-struct vfsmount *alloc_vfsmnt(const char *name)
+static struct vfsmount *alloc_vfsmnt(const char *name)
 {
         struct vfsmount *mnt = kmem_cache_zalloc(mnt_cache, GFP_KERNEL);
         if (mnt) {
@@ -466,7 +466,7 @@ static void __mnt_unmake_readonly(struct vfsmount *mnt)
         br_write_unlock(vfsmount_lock);
 }
 
-void free_vfsmnt(struct vfsmount *mnt)
+static void free_vfsmnt(struct vfsmount *mnt)
 {
         kfree(mnt->mnt_devname);
         mnt_free_id(mnt);
@@ -670,6 +670,36 @@ static struct vfsmount *skip_mnt_tree(struct vfsmount *p)
         return p;
 }
 
+struct vfsmount *
+vfs_kern_mount(struct file_system_type *type, int flags, const char *name, void *data)
+{
+        struct vfsmount *mnt;
+        struct dentry *root;
+
+        if (!type)
+                return ERR_PTR(-ENODEV);
+
+        mnt = alloc_vfsmnt(name);
+        if (!mnt)
+                return ERR_PTR(-ENOMEM);
+
+        if (flags & MS_KERNMOUNT)
+                mnt->mnt_flags = MNT_INTERNAL;
+
+        root = mount_fs(type, flags, name, data);
+        if (IS_ERR(root)) {
+                free_vfsmnt(mnt);
+                return ERR_CAST(root);
+        }
+
+        mnt->mnt_root = root;
+        mnt->mnt_sb = root->d_sb;
+        mnt->mnt_mountpoint = mnt->mnt_root;
+        mnt->mnt_parent = mnt;
+        return mnt;
+}
+EXPORT_SYMBOL_GPL(vfs_kern_mount);
+
 static struct vfsmount *clone_mnt(struct vfsmount *old, struct dentry *root,
                                         int flag)
 {
@@ -1905,7 +1935,81 @@ out:
         return err;
 }
 
-static int do_add_mount(struct vfsmount *, struct path *, int);
+static struct vfsmount *fs_set_subtype(struct vfsmount *mnt, const char *fstype)
+{
+        int err;
+        const char *subtype = strchr(fstype, '.');
+        if (subtype) {
+                subtype++;
+                err = -EINVAL;
+                if (!subtype[0])
+                        goto err;
+        } else
+                subtype = "";
+
+        mnt->mnt_sb->s_subtype = kstrdup(subtype, GFP_KERNEL);
+        err = -ENOMEM;
+        if (!mnt->mnt_sb->s_subtype)
+                goto err;
+        return mnt;
+
+ err:
+        mntput(mnt);
+        return ERR_PTR(err);
+}
+
+struct vfsmount *
+do_kern_mount(const char *fstype, int flags, const char *name, void *data)
+{
+        struct file_system_type *type = get_fs_type(fstype);
+        struct vfsmount *mnt;
+        if (!type)
+                return ERR_PTR(-ENODEV);
+        mnt = vfs_kern_mount(type, flags, name, data);
+        if (!IS_ERR(mnt) && (type->fs_flags & FS_HAS_SUBTYPE) &&
+            !mnt->mnt_sb->s_subtype)
+                mnt = fs_set_subtype(mnt, fstype);
+        put_filesystem(type);
+        return mnt;
+}
+EXPORT_SYMBOL_GPL(do_kern_mount);
+
+/*
+ * add a mount into a namespace's mount tree
+ */
+static int do_add_mount(struct vfsmount *newmnt, struct path *path, int mnt_flags)
+{
+        int err;
+
+        mnt_flags &= ~(MNT_SHARED | MNT_WRITE_HOLD | MNT_INTERNAL);
+
+        down_write(&namespace_sem);
+        /* Something was mounted here while we slept */
+        err = follow_down(path, true);
+        if (err < 0)
+                goto unlock;
+
+        err = -EINVAL;
+        if (!(mnt_flags & MNT_SHRINKABLE) && !check_mnt(path->mnt))
+                goto unlock;
+
+        /* Refuse the same filesystem on the same mount point */
+        err = -EBUSY;
+        if (path->mnt->mnt_sb == newmnt->mnt_sb &&
+            path->mnt->mnt_root == path->dentry)
+                goto unlock;
+
+        err = -EINVAL;
+        if (S_ISLNK(newmnt->mnt_root->d_inode->i_mode))
+                goto unlock;
+
+        newmnt->mnt_flags = mnt_flags;
+        err = graft_tree(newmnt, path);
+
+unlock:
+        up_write(&namespace_sem);
+        return err;
+}
 
 /*
  * create a new mount for userspace and request it to be added into the
@@ -1965,43 +2069,6 @@ fail:
         return err;
 }
 
-/*
- * add a mount into a namespace's mount tree
- */
-static int do_add_mount(struct vfsmount *newmnt, struct path *path, int mnt_flags)
-{
-        int err;
-
-        mnt_flags &= ~(MNT_SHARED | MNT_WRITE_HOLD | MNT_INTERNAL);
-
-        down_write(&namespace_sem);
-        /* Something was mounted here while we slept */
-        err = follow_down(path, true);
-        if (err < 0)
-                goto unlock;
-
-        err = -EINVAL;
-        if (!(mnt_flags & MNT_SHRINKABLE) && !check_mnt(path->mnt))
-                goto unlock;
-
-        /* Refuse the same filesystem on the same mount point */
-        err = -EBUSY;
-        if (path->mnt->mnt_sb == newmnt->mnt_sb &&
-            path->mnt->mnt_root == path->dentry)
-                goto unlock;
-
-        err = -EINVAL;
-        if (S_ISLNK(newmnt->mnt_root->d_inode->i_mode))
-                goto unlock;
-
-        newmnt->mnt_flags = mnt_flags;
-        err = graft_tree(newmnt, path);
-
-unlock:
-        up_write(&namespace_sem);
-        return err;
-}
-
 /**
  * mnt_set_expiry - Put a mount on an expiration list
  * @mnt: The mount to list.
@@ -2660,3 +2727,9 @@ void put_mnt_ns(struct mnt_namespace *ns)
         kfree(ns);
 }
 EXPORT_SYMBOL(put_mnt_ns);
+
+struct vfsmount *kern_mount_data(struct file_system_type *type, void *data)
+{
+        return vfs_kern_mount(type, MS_KERNMOUNT, type->name, data);
+}
+EXPORT_SYMBOL_GPL(kern_mount_data);