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File: [Development] / linux-2.6-xfs-all / kernel / user_namespace.c (download)

Revision 1.1, Wed Sep 12 17:09:56 2007 UTC (10 years, 1 month ago) by tes.longdrop.melbourne.sgi.com
Branch: MAIN 

Update 2.6.x-xfs to 2.6.23-rc4.

Also update fs/xfs with external mainline changes.
There were 12 such missing commits that I detected:

--------
commit ad690ef9e690f6c31f7d310b09ef1314bcec9033
Author: Al Viro <viro@ftp.linux.org.uk>
    xfs ioctl __user annotations

commit 20c2df83d25c6a95affe6157a4c9cac4cf5ffaac
Author: Paul Mundt <lethal@linux-sh.org>
    mm: Remove slab destructors from kmem_cache_create().

commit d0217ac04ca6591841e5665f518e38064f4e65bd
Author: Nick Piggin <npiggin@suse.de>
    mm: fault feedback #1

commit 54cb8821de07f2ffcd28c380ce9b93d5784b40d7
Author: Nick Piggin <npiggin@suse.de>
    mm: merge populate and nopage into fault (fixes nonlinear)

commit d00806b183152af6d24f46f0c33f14162ca1262a
Author: Nick Piggin <npiggin@suse.de>
    mm: fix fault vs invalidate race for linear mappings

commit a569425512253992cc64ebf8b6d00a62f986db3e
Author: Christoph Hellwig <hch@infradead.org>
    knfsd: exportfs: add exportfs.h header

commit 831441862956fffa17b9801db37e6ea1650b0f69
Author: Rafael J. Wysocki <rjw@sisk.pl>
    Freezer: make kernel threads nonfreezable by default

commit 8e1f936b73150f5095448a0fee6d4f30a1f9001d
Author: Rusty Russell <rusty@rustcorp.com.au>
    mm: clean up and kernelify shrinker registration

commit 5ffc4ef45b3b0a57872f631b4e4ceb8ace0d7496
Author: Jens Axboe <jens.axboe@oracle.com>
    sendfile: remove .sendfile from filesystems that use generic_file_sendfile()

commit 8bb7844286fb8c9fce6f65d8288aeb09d03a5e0d
Author: Rafael J. Wysocki <rjw@sisk.pl>
    Add suspend-related notifications for CPU hotplug

commit 59c51591a0ac7568824f541f57de967e88adaa07
Author: Michael Opdenacker <michael@free-electrons.com>
    Fix occurrences of "the the "

commit 0ceb331433e8aad9c5f441a965d7c681f8b9046f
Author: Dmitriy Monakhov <dmonakhov@openvz.org>
    mm: move common segment checks to separate helper function
--------
Merge of 2.6.x-xfs-melb:linux:29656b by kenmcd.

/*
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License as
 *  published by the Free Software Foundation, version 2 of the
 *  License.
 */

#include <linux/module.h>
#include <linux/version.h>
#include <linux/nsproxy.h>
#include <linux/user_namespace.h>

struct user_namespace init_user_ns = {
	.kref = {
		.refcount	= ATOMIC_INIT(2),
	},
	.root_user = &root_user,
};

EXPORT_SYMBOL_GPL(init_user_ns);

#ifdef CONFIG_USER_NS

/*
 * Clone a new ns copying an original user ns, setting refcount to 1
 * @old_ns: namespace to clone
 * Return NULL on error (failure to kmalloc), new ns otherwise
 */
static struct user_namespace *clone_user_ns(struct user_namespace *old_ns)
{
	struct user_namespace *ns;
	struct user_struct *new_user;
	int n;

	ns = kmalloc(sizeof(struct user_namespace), GFP_KERNEL);
	if (!ns)
		return ERR_PTR(-ENOMEM);

	kref_init(&ns->kref);

	for (n = 0; n < UIDHASH_SZ; ++n)
		INIT_LIST_HEAD(ns->uidhash_table + n);

	/* Insert new root user.  */
	ns->root_user = alloc_uid(ns, 0);
	if (!ns->root_user) {
		kfree(ns);
		return ERR_PTR(-ENOMEM);
	}

	/* Reset current->user with a new one */
	new_user = alloc_uid(ns, current->uid);
	if (!new_user) {
		free_uid(ns->root_user);
		kfree(ns);
		return ERR_PTR(-ENOMEM);
	}

	switch_uid(new_user);
	return ns;
}

struct user_namespace * copy_user_ns(int flags, struct user_namespace *old_ns)
{
	struct user_namespace *new_ns;

	BUG_ON(!old_ns);
	get_user_ns(old_ns);

	if (!(flags & CLONE_NEWUSER))
		return old_ns;

	new_ns = clone_user_ns(old_ns);

	put_user_ns(old_ns);
	return new_ns;
}

void free_user_ns(struct kref *kref)
{
	struct user_namespace *ns;

	ns = container_of(kref, struct user_namespace, kref);
	kfree(ns);
}

#endif /* CONFIG_USER_NS */