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authorTrond Myklebust <Trond.Myklebust@netapp.com>2006-06-09 09:34:15 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2006-06-09 09:34:15 -0400
commitbb4a58bf46473e3e83d84054bbc110db3a0f85e4 (patch)
tree41ee38709c36f86d565c1a3f311b8fa9546b3c8e
parentda6d503aa0a75ec44f17d985a2b500077e7f6a74 (diff)
VFS: Add GPL_EXPORTED function vfs_kern_mount()
do_kern_mount() does not allow the kernel to use private mount interfaces without exposing the same interfaces to userland. The problem is that the filesystem is referenced by name, thus meaning that it and its mount interface must be registered in the global filesystem list. vfs_kern_mount() passes the struct file_system_type as an explicit parameter in order to overcome this limitation. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
-rw-r--r--fs/super.c22
-rw-r--r--include/linux/mount.h5
2 files changed, 20 insertions, 7 deletions
diff --git a/fs/super.c b/fs/super.c
index a66f66bb804..848be4fc67a 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -800,17 +800,13 @@ struct super_block *get_sb_single(struct file_system_type *fs_type,
EXPORT_SYMBOL(get_sb_single);
struct vfsmount *
-do_kern_mount(const char *fstype, int flags, const char *name, void *data)
+vfs_kern_mount(struct file_system_type *type, int flags, const char *name, void *data)
{
- struct file_system_type *type = get_fs_type(fstype);
struct super_block *sb = ERR_PTR(-ENOMEM);
struct vfsmount *mnt;
int error;
char *secdata = NULL;
- if (!type)
- return ERR_PTR(-ENODEV);
-
mnt = alloc_vfsmnt(name);
if (!mnt)
goto out;
@@ -841,7 +837,6 @@ do_kern_mount(const char *fstype, int flags, const char *name, void *data)
mnt->mnt_parent = mnt;
up_write(&sb->s_umount);
free_secdata(secdata);
- put_filesystem(type);
return mnt;
out_sb:
up_write(&sb->s_umount);
@@ -852,10 +847,23 @@ out_free_secdata:
out_mnt:
free_vfsmnt(mnt);
out:
- put_filesystem(type);
return (struct vfsmount *)sb;
}
+EXPORT_SYMBOL_GPL(vfs_kern_mount);
+
+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);
+ put_filesystem(type);
+ return mnt;
+}
+
EXPORT_SYMBOL_GPL(do_kern_mount);
struct vfsmount *kern_mount(struct file_system_type *type)
diff --git a/include/linux/mount.h b/include/linux/mount.h
index b7472ae91fa..aff68c3660f 100644
--- a/include/linux/mount.h
+++ b/include/linux/mount.h
@@ -73,6 +73,11 @@ extern struct vfsmount *alloc_vfsmnt(const char *name);
extern struct vfsmount *do_kern_mount(const char *fstype, int flags,
const char *name, void *data);
+struct file_system_type;
+extern struct vfsmount *vfs_kern_mount(struct file_system_type *type,
+ int flags, const char *name,
+ void *data);
+
struct nameidata;
extern int do_add_mount(struct vfsmount *newmnt, struct nameidata *nd,