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authorPavel Emelyanov <xemul@openvz.org>2007-10-18 23:40:02 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-19 11:53:38 -0700
commit8bf9725c29f2589237dd696d06a204230add0ba3 (patch)
treeabe1a29924a592808250121435dcd12789336e8a /fs
parent2e4a707269a409950c3f315010c20f9719c594e2 (diff)
pid namespaces: introduce MS_KERNMOUNT flag
This flag tells the .get_sb callback that this is a kern_mount() call so that it can trust *data pointer to be valid in-kernel one. If this flag is passed from the user process, it is cleared since the *data pointer is not a valid kernel object. Running a few steps forward - this will be needed for proc to create the superblock and store a valid pid namespace on it during the namespace creation. The reason, why the namespace cannot live without proc mount is described in the appropriate patch. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Cc: Oleg Nesterov <oleg@tv-sign.ru> Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com> Cc: Paul Menage <menage@google.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/namespace.c2
-rw-r--r--fs/super.c6
2 files changed, 4 insertions, 4 deletions
diff --git a/fs/namespace.c b/fs/namespace.c
index 07daa7972591..860752998fb3 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1411,7 +1411,7 @@ long do_mount(char *dev_name, char *dir_name, char *type_page,
mnt_flags |= MNT_RELATIME;
flags &= ~(MS_NOSUID | MS_NOEXEC | MS_NODEV | MS_ACTIVE |
- MS_NOATIME | MS_NODIRATIME | MS_RELATIME);
+ MS_NOATIME | MS_NODIRATIME | MS_RELATIME| MS_KERNMOUNT);
/* ... and get the mountpoint */
retval = path_lookup(dir_name, LOOKUP_FOLLOW, &nd);
diff --git a/fs/super.c b/fs/super.c
index feaae7eeaffd..d28fde7e1cfb 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -944,9 +944,9 @@ do_kern_mount(const char *fstype, int flags, const char *name, void *data)
return mnt;
}
-struct vfsmount *kern_mount(struct file_system_type *type)
+struct vfsmount *kern_mount_data(struct file_system_type *type, void *data)
{
- return vfs_kern_mount(type, 0, type->name, NULL);
+ return vfs_kern_mount(type, MS_KERNMOUNT, type->name, data);
}
-EXPORT_SYMBOL(kern_mount);
+EXPORT_SYMBOL_GPL(kern_mount_data);