1 files changed, 65 insertions, 68 deletions

diff --git a/fs/namespace.c b/fs/namespace.c
index 6e283c93b50d..cce46702d33c 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1167,19 +1167,19 @@ asmlinkage long sys_oldumount(char __user * name)
 
 #endif
 
-static int mount_is_safe(struct nameidata *nd)
+static int mount_is_safe(struct path *path)
 {
         if (capable(CAP_SYS_ADMIN))
                 return 0;
         return -EPERM;
 #ifdef notyet
-        if (S_ISLNK(nd->path.dentry->d_inode->i_mode))
+        if (S_ISLNK(path->dentry->d_inode->i_mode))
                 return -EPERM;
-        if (nd->path.dentry->d_inode->i_mode & S_ISVTX) {
-                if (current->uid != nd->path.dentry->d_inode->i_uid)
+        if (path->dentry->d_inode->i_mode & S_ISVTX) {
+                if (current->uid != path->dentry->d_inode->i_uid)
                         return -EPERM;
         }
-        if (vfs_permission(nd, MAY_WRITE))
+        if (inode_permission(path->dentry->d_inode, MAY_WRITE))
                 return -EPERM;
         return 0;
 #endif
@@ -1425,11 +1425,10 @@ out_unlock:
 
 /*
  * recursively change the type of the mountpoint.
- * noinline this do_mount helper to save do_mount stack space.
  */
-static noinline int do_change_type(struct nameidata *nd, int flag)
+static int do_change_type(struct path *path, int flag)
 {
-        struct vfsmount *m, *mnt = nd->path.mnt;
+        struct vfsmount *m, *mnt = path->mnt;
         int recurse = flag & MS_REC;
         int type = flag & ~MS_REC;
         int err = 0;
@@ -1437,7 +1436,7 @@ static noinline int do_change_type(struct nameidata *nd, int flag)
         if (!capable(CAP_SYS_ADMIN))
                 return -EPERM;
 
-        if (nd->path.dentry != nd->path.mnt->mnt_root)
+        if (path->dentry != path->mnt->mnt_root)
                 return -EINVAL;
 
         down_write(&namespace_sem);
@@ -1459,40 +1458,39 @@ static noinline int do_change_type(struct nameidata *nd, int flag)
 
 /*
  * do loopback mount.
- * noinline this do_mount helper to save do_mount stack space.
  */
-static noinline int do_loopback(struct nameidata *nd, char *old_name,
+static int do_loopback(struct path *path, char *old_name,
                                 int recurse)
 {
-        struct nameidata old_nd;
+        struct path old_path;
         struct vfsmount *mnt = NULL;
-        int err = mount_is_safe(nd);
+        int err = mount_is_safe(path);
         if (err)
                 return err;
         if (!old_name || !*old_name)
                 return -EINVAL;
-        err = path_lookup(old_name, LOOKUP_FOLLOW, &old_nd);
+        err = kern_path(old_name, LOOKUP_FOLLOW, &old_path);
         if (err)
                 return err;
 
         down_write(&namespace_sem);
         err = -EINVAL;
-        if (IS_MNT_UNBINDABLE(old_nd.path.mnt))
+        if (IS_MNT_UNBINDABLE(old_path.mnt))
                 goto out;
 
-        if (!check_mnt(nd->path.mnt) || !check_mnt(old_nd.path.mnt))
+        if (!check_mnt(path->mnt) || !check_mnt(old_path.mnt))
                 goto out;
 
         err = -ENOMEM;
         if (recurse)
-                mnt = copy_tree(old_nd.path.mnt, old_nd.path.dentry, 0);
+                mnt = copy_tree(old_path.mnt, old_path.dentry, 0);
         else
-                mnt = clone_mnt(old_nd.path.mnt, old_nd.path.dentry, 0);
+                mnt = clone_mnt(old_path.mnt, old_path.dentry, 0);
 
         if (!mnt)
                 goto out;
 
-        err = graft_tree(mnt, &nd->path);
+        err = graft_tree(mnt, path);
         if (err) {
                 LIST_HEAD(umount_list);
                 spin_lock(&vfsmount_lock);
@@ -1503,7 +1501,7 @@ static noinline int do_loopback(struct nameidata *nd, char *old_name,
 
 out:
         up_write(&namespace_sem);
-        path_put(&old_nd.path);
+        path_put(&old_path);
         return err;
 }
 
@@ -1528,33 +1526,37 @@ static int change_mount_flags(struct vfsmount *mnt, int ms_flags)
  * change filesystem flags. dir should be a physical root of filesystem.
  * If you've mounted a non-root directory somewhere and want to do remount
  * on it - tough luck.
- * noinline this do_mount helper to save do_mount stack space.
  */
-static noinline int do_remount(struct nameidata *nd, int flags, int mnt_flags,
+static int do_remount(struct path *path, int flags, int mnt_flags,
                       void *data)
 {
         int err;
-        struct super_block *sb = nd->path.mnt->mnt_sb;
+        struct super_block *sb = path->mnt->mnt_sb;
 
         if (!capable(CAP_SYS_ADMIN))
                 return -EPERM;
 
-        if (!check_mnt(nd->path.mnt))
+        if (!check_mnt(path->mnt))
                 return -EINVAL;
 
-        if (nd->path.dentry != nd->path.mnt->mnt_root)
+        if (path->dentry != path->mnt->mnt_root)
                 return -EINVAL;
 
         down_write(&sb->s_umount);
         if (flags & MS_BIND)
-                err = change_mount_flags(nd->path.mnt, flags);
+                err = change_mount_flags(path->mnt, flags);
         else
                 err = do_remount_sb(sb, flags, data, 0);
         if (!err)
-                nd->path.mnt->mnt_flags = mnt_flags;
+                path->mnt->mnt_flags = mnt_flags;
         up_write(&sb->s_umount);
-        if (!err)
-                security_sb_post_remount(nd->path.mnt, flags, data);
+        if (!err) {
+                security_sb_post_remount(path->mnt, flags, data);
+
+                spin_lock(&vfsmount_lock);
+                touch_mnt_namespace(path->mnt->mnt_ns);
+                spin_unlock(&vfsmount_lock);
+        }
         return err;
 }
 
@@ -1568,90 +1570,85 @@ static inline int tree_contains_unbindable(struct vfsmount *mnt)
         return 0;
 }
 
-/*
- * noinline this do_mount helper to save do_mount stack space.
- */
-static noinline int do_move_mount(struct nameidata *nd, char *old_name)
+static int do_move_mount(struct path *path, char *old_name)
 {
-        struct nameidata old_nd;
-        struct path parent_path;
+        struct path old_path, parent_path;
         struct vfsmount *p;
         int err = 0;
         if (!capable(CAP_SYS_ADMIN))
                 return -EPERM;
         if (!old_name || !*old_name)
                 return -EINVAL;
-        err = path_lookup(old_name, LOOKUP_FOLLOW, &old_nd);
+        err = kern_path(old_name, LOOKUP_FOLLOW, &old_path);
         if (err)
                 return err;
 
         down_write(&namespace_sem);
-        while (d_mountpoint(nd->path.dentry) &&
-               follow_down(&nd->path.mnt, &nd->path.dentry))
+        while (d_mountpoint(path->dentry) &&
+               follow_down(&path->mnt, &path->dentry))
                 ;
         err = -EINVAL;
-        if (!check_mnt(nd->path.mnt) || !check_mnt(old_nd.path.mnt))
+        if (!check_mnt(path->mnt) || !check_mnt(old_path.mnt))
                 goto out;
 
         err = -ENOENT;
-        mutex_lock(&nd->path.dentry->d_inode->i_mutex);
-        if (IS_DEADDIR(nd->path.dentry->d_inode))
+        mutex_lock(&path->dentry->d_inode->i_mutex);
+        if (IS_DEADDIR(path->dentry->d_inode))
                 goto out1;
 
-        if (!IS_ROOT(nd->path.dentry) && d_unhashed(nd->path.dentry))
+        if (!IS_ROOT(path->dentry) && d_unhashed(path->dentry))
                 goto out1;
 
         err = -EINVAL;
-        if (old_nd.path.dentry != old_nd.path.mnt->mnt_root)
+        if (old_path.dentry != old_path.mnt->mnt_root)
                 goto out1;
 
-        if (old_nd.path.mnt == old_nd.path.mnt->mnt_parent)
+        if (old_path.mnt == old_path.mnt->mnt_parent)
                 goto out1;
 
-        if (S_ISDIR(nd->path.dentry->d_inode->i_mode) !=
-              S_ISDIR(old_nd.path.dentry->d_inode->i_mode))
+        if (S_ISDIR(path->dentry->d_inode->i_mode) !=
+              S_ISDIR(old_path.dentry->d_inode->i_mode))
                 goto out1;
         /*
          * Don't move a mount residing in a shared parent.
          */
-        if (old_nd.path.mnt->mnt_parent &&
-            IS_MNT_SHARED(old_nd.path.mnt->mnt_parent))
+        if (old_path.mnt->mnt_parent &&
+            IS_MNT_SHARED(old_path.mnt->mnt_parent))
                 goto out1;
         /*
          * Don't move a mount tree containing unbindable mounts to a destination
          * mount which is shared.
          */
-        if (IS_MNT_SHARED(nd->path.mnt) &&
-            tree_contains_unbindable(old_nd.path.mnt))
+        if (IS_MNT_SHARED(path->mnt) &&
+            tree_contains_unbindable(old_path.mnt))
                 goto out1;
         err = -ELOOP;
-        for (p = nd->path.mnt; p->mnt_parent != p; p = p->mnt_parent)
-                if (p == old_nd.path.mnt)
+        for (p = path->mnt; p->mnt_parent != p; p = p->mnt_parent)
+                if (p == old_path.mnt)
                         goto out1;
 
-        err = attach_recursive_mnt(old_nd.path.mnt, &nd->path, &parent_path);
+        err = attach_recursive_mnt(old_path.mnt, path, &parent_path);
         if (err)
                 goto out1;
 
         /* if the mount is moved, it should no longer be expire
          * automatically */
-        list_del_init(&old_nd.path.mnt->mnt_expire);
+        list_del_init(&old_path.mnt->mnt_expire);
 out1:
-        mutex_unlock(&nd->path.dentry->d_inode->i_mutex);
+        mutex_unlock(&path->dentry->d_inode->i_mutex);
 out:
         up_write(&namespace_sem);
         if (!err)
                 path_put(&parent_path);
-        path_put(&old_nd.path);
+        path_put(&old_path);
         return err;
 }
 
 /*
  * create a new mount for userspace and request it to be added into the
  * namespace's tree
- * noinline this do_mount helper to save do_mount stack space.
  */
-static noinline int do_new_mount(struct nameidata *nd, char *type, int flags,
+static int do_new_mount(struct path *path, char *type, int flags,
                         int mnt_flags, char *name, void *data)
 {
         struct vfsmount *mnt;
@@ -1667,7 +1664,7 @@ static noinline int do_new_mount(struct nameidata *nd, char *type, int flags,
         if (IS_ERR(mnt))
                 return PTR_ERR(mnt);
 
-        return do_add_mount(mnt, &nd->path, mnt_flags, NULL);
+        return do_add_mount(mnt, path, mnt_flags, NULL);
 }
 
 /*
@@ -1902,7 +1899,7 @@ int copy_mount_options(const void __user * data, unsigned long *where)
 long do_mount(char *dev_name, char *dir_name, char *type_page,
                   unsigned long flags, void *data_page)
 {
-        struct nameidata nd;
+        struct path path;
         int retval = 0;
         int mnt_flags = 0;
 
@@ -1940,29 +1937,29 @@ long do_mount(char *dev_name, char *dir_name, char *type_page,
                    MS_NOATIME | MS_NODIRATIME | MS_RELATIME| MS_KERNMOUNT);
 
         /* ... and get the mountpoint */
-        retval = path_lookup(dir_name, LOOKUP_FOLLOW, &nd);
+        retval = kern_path(dir_name, LOOKUP_FOLLOW, &path);
         if (retval)
                 return retval;
 
-        retval = security_sb_mount(dev_name, &nd.path,
+        retval = security_sb_mount(dev_name, &path,
                                    type_page, flags, data_page);
         if (retval)
                 goto dput_out;
 
         if (flags & MS_REMOUNT)
-                retval = do_remount(&nd, flags & ~MS_REMOUNT, mnt_flags,
+                retval = do_remount(&path, flags & ~MS_REMOUNT, mnt_flags,
                                     data_page);
         else if (flags & MS_BIND)
-                retval = do_loopback(&nd, dev_name, flags & MS_REC);
+                retval = do_loopback(&path, dev_name, flags & MS_REC);
         else if (flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE))
-                retval = do_change_type(&nd, flags);
+                retval = do_change_type(&path, flags);
         else if (flags & MS_MOVE)
-                retval = do_move_mount(&nd, dev_name);
+                retval = do_move_mount(&path, dev_name);
         else
-                retval = do_new_mount(&nd, type_page, flags, mnt_flags,
+                retval = do_new_mount(&path, type_page, flags, mnt_flags,
                                       dev_name, data_page);
 dput_out:
-        path_put(&nd.path);
+        path_put(&path);
         return retval;
 }