/* FS-Cache netfs (client) registration
 *
 * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */

#define FSCACHE_DEBUG_LEVEL COOKIE
#include <linux/module.h>
#include <linux/slab.h>
#include "internal.h"

static LIST_HEAD(fscache_netfs_list);

/*
 * register a network filesystem for caching
 */
int __fscache_register_netfs(struct fscache_netfs *netfs)
{
	struct fscache_netfs *ptr;
	struct fscache_cookie *cookie;
	int ret;

	_enter("{%s}", netfs->name);

	INIT_LIST_HEAD(&netfs->link);

	/* allocate a cookie for the primary index */
	cookie = kmem_cache_zalloc(fscache_cookie_jar, GFP_KERNEL);

	if (!cookie) {
		_leave(" = -ENOMEM");
		return -ENOMEM;
	}

	/* initialise the primary index cookie */
	atomic_set(&cookie->usage, 1);
	atomic_set(&cookie->n_children, 0);
	atomic_set(&cookie->n_active, 1);

	cookie->def		= &fscache_fsdef_netfs_def;
	cookie->parent		= &fscache_fsdef_index;
	cookie->netfs_data	= netfs;
	cookie->flags		= 1 << FSCACHE_COOKIE_ENABLED;

	spin_lock_init(&cookie->lock);
	INIT_HLIST_HEAD(&cookie->backing_objects);

	/* check the netfs type is not already present */
	down_write(&fscache_addremove_sem);

	ret = -EEXIST;
	list_for_each_entry(ptr, &fscache_netfs_list, link) {
		if (strcmp(ptr->name, netfs->name) == 0)
			goto already_registered;
	}

	atomic_inc(&cookie->parent->usage);
	atomic_inc(&cookie->parent->n_children);

	netfs->primary_index = cookie;
	list_add(&netfs->link, &fscache_netfs_list);
	ret = 0;

	pr_notice("Netfs '%s' registered for caching\n", netfs->name);

already_registered:
	up_write(&fscache_addremove_sem);

	if (ret < 0)
		kmem_cache_free(fscache_cookie_jar, cookie);

	_leave(" = %d", ret);
	return ret;
}
EXPORT_SYMBOL(__fscache_register_netfs);

/*
 * unregister a network filesystem from the cache
 * - all cookies must have been released first
 */
void __fscache_unregister_netfs(struct fscache_netfs *netfs)
{
	_enter("{%s.%u}", netfs->name, netfs->version);

	down_write(&fscache_addremove_sem);

	list_del(&netfs->link);
	fscache_relinquish_cookie(netfs->primary_index, 0);

	up_write(&fscache_addremove_sem);

	pr_notice("Netfs '%s' unregistered from caching\n",
		  netfs->name);

	_leave("");
}
EXPORT_SYMBOL(__fscache_unregister_netfs);
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?h=nds-private-remove&amp;id=e60234ddb541b556b57353dfddca73155977d02f'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/include?h=nds-private-remove&amp;id=e60234ddb541b556b57353dfddca73155977d02f'>include</a>/<a href='/cgit.cgi/linux/net-next.git/log/include/net?h=nds-private-remove&amp;id=e60234ddb541b556b57353dfddca73155977d02f'>net</a>/<a href='/cgit.cgi/linux/net-next.git/log/include/net/netns?h=nds-private-remove&amp;id=e60234ddb541b556b57353dfddca73155977d02f'>netns</a>/<a href='/cgit.cgi/linux/net-next.git/log/include/net/netns/nftables.h?h=nds-private-remove&amp;id=e60234ddb541b556b57353dfddca73155977d02f'>nftables.h</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/include/net/netns/nftables.h?h=nds-private-remove&amp;id=e60234ddb541b556b57353dfddca73155977d02f&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
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<tr><th>author</th><td>Laura Abbott &lt;labbott@redhat.com&gt;</td><td class='right'>2016-12-21 12:32:54 -0800</td></tr>
<tr><th>committer</th><td>Herbert Xu &lt;herbert@gondor.apana.org.au&gt;</td><td class='right'>2016-12-27 17:32:11 +0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/net/9p/9p.h?h=nds-private-remove&amp;id=02608e02fbec04fccf2eb0cc8d8082f65c0a4286'>02608e02fbec04fccf2eb0cc8d8082f65c0a4286</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include/net/9p/9p.h?id=02608e02fbec04fccf2eb0cc8d8082f65c0a4286'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=02608e02fbec04fccf2eb0cc8d8082f65c0a4286'>37ff0410d130cfe77185f591b07cd6403f207f0c</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/net/9p/9p.h?h=nds-private-remove&amp;id=02608e02fbec04fccf2eb0cc8d8082f65c0a4286'>include/net/9p/9p.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/net/9p/9p.h?h=nds-private-remove&amp;id=7ce7d89f48834cefece7804d38fc5d85382edf77'>7ce7d89f48834cefece7804d38fc5d85382edf77</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/net/9p/9p.h?h=nds-private-remove&amp;id=02608e02fbec04fccf2eb0cc8d8082f65c0a4286&amp;id2=7ce7d89f48834cefece7804d38fc5d85382edf77'>diff</a>)</td></tr></table>
<div class='commit-subject'>crypto: testmgr - Use heap buffer for acomp test input</div><div class='commit-msg'>Christopher Covington reported a crash on aarch64 on recent Fedora
kernels:

kernel BUG at ./include/linux/scatterlist.h:140!
Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
Modules linked in:
CPU: 2 PID: 752 Comm: cryptomgr_test Not tainted 4.9.0-11815-ge93b1cc #162
Hardware name: linux,dummy-virt (DT)
task: ffff80007c650080 task.stack: ffff800008910000
PC is at sg_init_one+0xa0/0xb8
LR is at sg_init_one+0x24/0xb8
...
[&lt;ffff000008398db8&gt;] sg_init_one+0xa0/0xb8
[&lt;ffff000008350a44&gt;] test_acomp+0x10c/0x438
[&lt;ffff000008350e20&gt;] alg_test_comp+0xb0/0x118
[&lt;ffff00000834f28c&gt;] alg_test+0x17c/0x2f0
[&lt;ffff00000834c6a4&gt;] cryptomgr_test+0x44/0x50
[&lt;ffff0000080dac70&gt;] kthread+0xf8/0x128
[&lt;ffff000008082ec0&gt;] ret_from_fork+0x10/0x50

The test vectors used for input are part of the kernel image. These
inputs are passed as a buffer to sg_init_one which eventually blows up
with BUG_ON(!virt_addr_valid(buf)). On arm64, virt_addr_valid returns
false for the kernel image since virt_to_page will not return the
correct page. Fix this by copying the input vectors to heap buffer
before setting up the scatterlist.

Reported-by: Christopher Covington &lt;cov@codeaurora.org&gt;
Fixes: d7db7a882deb ("crypto: acomp - update testmgr with support for acomp")
Signed-off-by: Laura Abbott &lt;labbott@redhat.com&gt;
Signed-off-by: Herbert Xu &lt;herbert@gondor.apana.org.au&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=02608e02fbec04fccf2eb0cc8d8082f65c0a4286'>Diffstat</a> (limited to 'include/net/9p/9p.h')</div><table summary='diffstat' class='diffstat'>