/*
 * Copyright (C) 2013 Fusion IO.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License v2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#include <linux/slab.h>
#include "btrfs-tests.h"
#include "../ctree.h"
#include "../extent_io.h"
#include "../disk-io.h"

static int test_btrfs_split_item(u32 sectorsize, u32 nodesize)
{
	struct btrfs_fs_info *fs_info;
	struct btrfs_path *path = NULL;
	struct btrfs_root *root = NULL;
	struct extent_buffer *eb;
	struct btrfs_item *item;
	char *value = "mary had a little lamb";
	char *split1 = "mary had a little";
	char *split2 = " lamb";
	char *split3 = "mary";
	char *split4 = " had a little";
	char buf[32];
	struct btrfs_key key;
	u32 value_len = strlen(value);
	int ret = 0;

	test_msg("Running btrfs_split_item tests\n");

	fs_info = btrfs_alloc_dummy_fs_info(nodesize, sectorsize);
	if (!fs_info) {
		test_msg("Could not allocate fs_info\n");
		return -ENOMEM;
	}

	root = btrfs_alloc_dummy_root(fs_info);
	if (IS_ERR(root)) {
		test_msg("Could not allocate root\n");
		ret = PTR_ERR(root);
		goto out;
	}

	path = btrfs_alloc_path();
	if (!path) {
		test_msg("Could not allocate path\n");
		ret = -ENOMEM;
		goto out;
	}

	path->nodes[0] = eb = alloc_dummy_extent_buffer(fs_info, nodesize);
	if (!eb) {
		test_msg("Could not allocate dummy buffer\n");
		ret = -ENOMEM;
		goto out;
	}
	path->slots[0] = 0;

	key.objectid = 0;
	key.type = BTRFS_EXTENT_CSUM_KEY;
	key.offset = 0;

	setup_items_for_insert(root, path, &key, &value_len, value_len,
			       value_len + sizeof(struct btrfs_item), 1);
	item = btrfs_item_nr(0);
	write_extent_buffer(eb, value, btrfs_item_ptr_offset(eb, 0),
			    value_len);

	key.offset = 3;

	/*
	 * Passing NULL trans here should be safe because we have plenty of
	 * space in this leaf to split the item without having to split the
	 * leaf.
	 */
	ret = btrfs_split_item(NULL, root, path, &key, 17);
	if (ret) {
		test_msg("Split item failed %d\n", ret);
		goto out;
	}

	/*
	 * Read the first slot, it should have the original key and contain only
	 * 'mary had a little'
	 */
	btrfs_item_key_to_cpu(eb, &key, 0);
	if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
	    key.offset != 0) {
		test_msg("Invalid key at slot 0\n");
		ret = -EINVAL;
		goto out;
	}

	item = btrfs_item_nr(0);
	if (btrfs_item_size(eb, item) != strlen(split1)) {
		test_msg("Invalid len in the first split\n");
		ret = -EINVAL;
		goto out;
	}

	read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 0),
			   strlen(split1));
	if (memcmp(buf, split1, strlen(split1))) {
		test_msg("Data in the buffer doesn't match what it should "
			 "in the first split have='%.*s' want '%s'\n",
			 (int)strlen(split1), buf, split1);
		ret = -EINVAL;
		goto out;
	}

	btrfs_item_key_to_cpu(eb, &key, 1);
	if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
	    key.offset != 3) {
		test_msg("Invalid key at slot 1\n");
		ret = -EINVAL;
		goto out;
	}

	item = btrfs_item_nr(1);
	if (btrfs_item_size(eb, item) != strlen(split2)) {
		test_msg("Invalid len in the second split\n");
		ret = -EINVAL;
		goto out;
	}

	read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 1),
			   strlen(split2));
	if (memcmp(buf, split2, strlen(split2))) {
		test_msg("Data in the buffer doesn't match what it should "
			 "in the second split\n");
		ret = -EINVAL;
		goto out;
	}

	key.offset = 1;
	/* Do it again so we test memmoving the other items in the leaf */
	ret = btrfs_split_item(NULL, root, path, &key, 4);
	if (ret) {
		test_msg("Second split item failed %d\n", ret);
		goto out;
	}

	btrfs_item_key_to_cpu(eb, &key, 0);
	if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
	    key.offset != 0) {
		test_msg("Invalid key at slot 0\n");
		ret = -EINVAL;
		goto out;
	}

	item = btrfs_item_nr(0);
	if (btrfs_item_size(eb, item) != strlen(split3)) {
		test_msg("Invalid len in the first split\n");
		ret = -EINVAL;
		goto out;
	}

	read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 0),
			   strlen(split3));
	if (memcmp(buf, split3, strlen(split3))) {
		test_msg("Data in the buffer doesn't match what it should "
			 "in the third split");
		ret = -EINVAL;
		goto out;
	}

	btrfs_item_key_to_cpu(eb, &key, 1);
	if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
	    key.offset != 1) {
		test_msg("Invalid key at slot 1\n");
		ret = -EINVAL;
		goto out;
	}

	item = btrfs_item_nr(1);
	if (btrfs_item_size(eb, item) != strlen(split4)) {
		test_msg("Invalid len in the second split\n");
		ret = -EINVAL;
		goto out;
	}

	read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 1),
			   strlen(split4));
	if (memcmp(buf, split4, strlen(split4))) {
		test_msg("Data in the buffer doesn't match what it should "
			 "in the fourth split\n");
		ret = -EINVAL;
		goto out;
	}

	btrfs_item_key_to_cpu(eb, &key, 2);
	if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
	    key.offset != 3) {
		test_msg("Invalid key at slot 2\n");
		ret = -EINVAL;
		goto out;
	}

	item = btrfs_item_nr(2);
	if (btrfs_item_size(eb, item) != strlen(split2)) {
		test_msg("Invalid len in the second split\n");
		ret = -EINVAL;
		goto out;
	}

	read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 2),
			   strlen(split2));
	if (memcmp(buf, split2, strlen(split2))) {
		test_msg("Data in the buffer doesn't match what it should "
			 "in the last chunk\n");
		ret = -EINVAL;
		goto out;
	}
out:
	btrfs_free_path(path);
	btrfs_free_dummy_root(root);
	btrfs_free_dummy_fs_info(fs_info);
	return ret;
}

int btrfs_test_extent_buffer_operations(u32 sectorsize, u32 nodesize)
{
	test_msg("Running extent buffer operation tests\n");
	return test_btrfs_split_item(sectorsize, nodesize);
}
eason is that the per CPU MCE timer is
started by the CMCI logic before the MCE CPU hotplug callback starts the
timer with add_timer_on(). So the timer is already queued which triggers
the BUG.

Using add_timer_on() is pretty pointless in this code because the timer is
strictlty per CPU, initialized as pinned and all operations which arm the
timer happen on the CPU to which the timer belongs.

Simplify the whole machinery by using mod_timer() instead of add_timer_on()
which avoids the problem because mod_timer() can handle already queued
timers. Use __start_timer() everywhere so the earliest armed expiry time is
preserved.

Reported-by: Erik Veijola &lt;erik.veijola@intel.com&gt;
Tested-by: Borislav Petkov &lt;bp@alien8.de&gt;
Signed-off-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;
Reviewed-by: Borislav Petkov &lt;bp@alien8.de&gt;
Cc: Tony Luck &lt;tony.luck@intel.com&gt;
Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1701310936080.3457@nanos
Signed-off-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;

</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=0becc0ae5b42828785b589f686725ff5bc3b9b25'>Diffstat</a> (limited to 'security/selinux/ss/symtab.c')</div><table summary='diffstat' class='diffstat'>