X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=fs%2Fnamespace.c;h=f0e353f5bc3083fd38dcf19af5d8e8437e7c872e;hb=e0ad7b073eb7317e5afe0385b02dcb1d52a1eedf;hp=2019899f2ab822caec7dd235e8c610096549a93b;hpb=5643f000c1e10ab991182478b76550e1364c3570;p=linux-2.6-omap-h63xx.git

diff --git a/fs/namespace.c b/fs/namespace.c
index 2019899f2ab..f0e353f5bc3 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -451,7 +451,7 @@ EXPORT_SYMBOL(may_umount);
 void release_mounts(struct list_head *head)
 {
 	struct vfsmount *mnt;
-	while(!list_empty(head)) {
+	while (!list_empty(head)) {
 		mnt = list_entry(head->next, struct vfsmount, mnt_hash);
 		list_del_init(&mnt->mnt_hash);
 		if (mnt->mnt_parent != mnt) {
@@ -814,7 +814,7 @@ static int graft_tree(struct vfsmount *mnt, struct nameidata *nd)
 		return -ENOTDIR;
 
 	err = -ENOENT;
-	down(&nd->dentry->d_inode->i_sem);
+	mutex_lock(&nd->dentry->d_inode->i_mutex);
 	if (IS_DEADDIR(nd->dentry->d_inode))
 		goto out_unlock;
 
@@ -826,7 +826,7 @@ static int graft_tree(struct vfsmount *mnt, struct nameidata *nd)
 	if (IS_ROOT(nd->dentry) || !d_unhashed(nd->dentry))
 		err = attach_recursive_mnt(mnt, nd, NULL);
 out_unlock:
-	up(&nd->dentry->d_inode->i_sem);
+	mutex_unlock(&nd->dentry->d_inode->i_mutex);
 	if (!err)
 		security_sb_post_addmount(mnt, nd);
 	return err;
@@ -962,7 +962,7 @@ static int do_move_mount(struct nameidata *nd, char *old_name)
 		goto out;
 
 	err = -ENOENT;
-	down(&nd->dentry->d_inode->i_sem);
+	mutex_lock(&nd->dentry->d_inode->i_mutex);
 	if (IS_DEADDIR(nd->dentry->d_inode))
 		goto out1;
 
@@ -1004,7 +1004,7 @@ static int do_move_mount(struct nameidata *nd, char *old_name)
 	list_del_init(&old_nd.mnt->mnt_expire);
 	spin_unlock(&vfsmount_lock);
 out1:
-	up(&nd->dentry->d_inode->i_sem);
+	mutex_unlock(&nd->dentry->d_inode->i_mutex);
 out:
 	up_write(&namespace_sem);
 	if (!err)
@@ -1526,6 +1526,10 @@ static void chroot_fs_refs(struct nameidata *old_nd, struct nameidata *new_nd)
  * pointed to by put_old must yield the same directory as new_root. No other
  * file system may be mounted on put_old. After all, new_root is a mountpoint.
  *
+ * Also, the current root cannot be on the 'rootfs' (initial ramfs) filesystem.
+ * See Documentation/filesystems/ramfs-rootfs-initramfs.txt for alternatives
+ * in this situation.
+ *
  * Notes:
  *  - we don't move root/cwd if they are not at the root (reason: if something
  *    cared enough to change them, it's probably wrong to force them elsewhere)
@@ -1569,7 +1573,7 @@ asmlinkage long sys_pivot_root(const char __user * new_root,
 	user_nd.dentry = dget(current->fs->root);
 	read_unlock(&current->fs->lock);
 	down_write(&namespace_sem);
-	down(&old_nd.dentry->d_inode->i_sem);
+	mutex_lock(&old_nd.dentry->d_inode->i_mutex);
 	error = -EINVAL;
 	if (IS_MNT_SHARED(old_nd.mnt) ||
 		IS_MNT_SHARED(new_nd.mnt->mnt_parent) ||
@@ -1622,7 +1626,7 @@ asmlinkage long sys_pivot_root(const char __user * new_root,
 	path_release(&root_parent);
 	path_release(&parent_nd);
 out2:
-	up(&old_nd.dentry->d_inode->i_sem);
+	mutex_unlock(&old_nd.dentry->d_inode->i_mutex);
 	up_write(&namespace_sem);
 	path_release(&user_nd);
 	path_release(&old_nd);