/*
 * usnjrnl.h - NTFS kernel transaction log ($UsnJrnl) handling.  Part of the
 *	       Linux-NTFS project.
 *
 * Copyright (c) 2005 Anton Altaparmakov
 *
 * This program/include file 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program/include file 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 (in the main directory of the Linux-NTFS
 * distribution in the file COPYING); if not, write to the Free Software
 * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifdef NTFS_RW

#include <linux/fs.h>
#include <linux/highmem.h>
#include <linux/mm.h>

#include "aops.h"
#include "debug.h"
#include "endian.h"
#include "time.h"
#include "types.h"
#include "usnjrnl.h"
#include "volume.h"

/**
 * ntfs_stamp_usnjrnl - stamp the transaction log ($UsnJrnl) on an ntfs volume
 * @vol:	ntfs volume on which to stamp the transaction log
 *
 * Stamp the transaction log ($UsnJrnl) on the ntfs volume @vol and return
 * 'true' on success and 'false' on error.
 *
 * This function assumes that the transaction log has already been loaded and
 * consistency checked by a call to fs/ntfs/super.c::load_and_init_usnjrnl().
 */
bool ntfs_stamp_usnjrnl(ntfs_volume *vol)
{
	ntfs_debug("Entering.");
	if (likely(!NVolUsnJrnlStamped(vol))) {
		sle64 stamp;
		struct page *page;
		USN_HEADER *uh;

		page = ntfs_map_page(vol->usnjrnl_max_ino->i_mapping, 0);
		if (IS_ERR(page)) {
			ntfs_error(vol->sb, "Failed to read from "
					"$UsnJrnl/$DATA/$Max attribute.");
			return false;
		}
		uh = (USN_HEADER*)page_address(page);
		stamp = get_current_ntfs_time();
		ntfs_debug("Stamping transaction log ($UsnJrnl): old "
				"journal_id 0x%llx, old lowest_valid_usn "
				"0x%llx, new journal_id 0x%llx, new "
				"lowest_valid_usn 0x%llx.",
				(long long)sle64_to_cpu(uh->journal_id),
				(long long)sle64_to_cpu(uh->lowest_valid_usn),
				(long long)sle64_to_cpu(stamp),
				i_size_read(vol->usnjrnl_j_ino));
		uh->lowest_valid_usn =
				cpu_to_sle64(i_size_read(vol->usnjrnl_j_ino));
		uh->journal_id = stamp;
		flush_dcache_page(page);
		set_page_dirty(page);
		ntfs_unmap_page(page);
		/* Set the flag so we do not have to do it again on remount. */
		NVolSetUsnJrnlStamped(vol);
	}
	ntfs_debug("Done.");
	return true;
}

#endif /* NTFS_RW */
>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=e47483bca2cc59a4593b37a270b16ee42b1d9f08'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include?h=nds-private-remove&amp;id=e47483bca2cc59a4593b37a270b16ee42b1d9f08'>include</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/sound?h=nds-private-remove&amp;id=e47483bca2cc59a4593b37a270b16ee42b1d9f08'>sound</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/sound/info.h?h=nds-private-remove&amp;id=e47483bca2cc59a4593b37a270b16ee42b1d9f08'>info.h</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='e47483bca2cc59a4593b37a270b16ee42b1d9f08'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Vlastimil Babka &lt;vbabka@suse.cz&gt;</td><td class='right'>2017-01-24 15:18:41 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-24 16:26:14 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/sound/info.h?h=nds-private-remove&amp;id=e47483bca2cc59a4593b37a270b16ee42b1d9f08'>e47483bca2cc59a4593b37a270b16ee42b1d9f08</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include/sound/info.h?id=e47483bca2cc59a4593b37a270b16ee42b1d9f08'>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=e47483bca2cc59a4593b37a270b16ee42b1d9f08'>4bc66bd4f2f87a30d231068468d29900685fb45f</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/sound/info.h?h=nds-private-remove&amp;id=e47483bca2cc59a4593b37a270b16ee42b1d9f08'>include/sound/info.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/sound/info.h?h=nds-private-remove&amp;id=5ce9bfef1d27944c119a397a9d827bef795487ce'>5ce9bfef1d27944c119a397a9d827bef795487ce</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/sound/info.h?h=nds-private-remove&amp;id=e47483bca2cc59a4593b37a270b16ee42b1d9f08&amp;id2=5ce9bfef1d27944c119a397a9d827bef795487ce'>diff</a>)</td></tr></table>
<div class='commit-subject'>mm, page_alloc: fix premature OOM when racing with cpuset mems update</div><div class='commit-msg'>Ganapatrao Kulkarni reported that the LTP test cpuset01 in stress mode
triggers OOM killer in few seconds, despite lots of free memory.  The
test attempts to repeatedly fault in memory in one process in a cpuset,
while changing allowed nodes of the cpuset between 0 and 1 in another
process.

The problem comes from insufficient protection against cpuset changes,
which can cause get_page_from_freelist() to consider all zones as
non-eligible due to nodemask and/or current-&gt;mems_allowed.  This was
masked in the past by sufficient retries, but since commit 682a3385e773
("mm, page_alloc: inline the fast path of the zonelist iterator") we fix
the preferred_zoneref once, and don't iterate over the whole zonelist in
further attempts, thus the only eligible zones might be placed in the
zonelist before our starting point and we always miss them.

A previous patch fixed this problem for current-&gt;mems_allowed.  However,
cpuset changes also update the task's mempolicy nodemask.  The fix has
two parts.  We have to repeat the preferred_zoneref search when we
detect cpuset update by way of seqcount, and we have to check the
seqcount before considering OOM.

[akpm@linux-foundation.org: fix typo in comment]
Link: http://lkml.kernel.org/r/20170120103843.24587-5-vbabka@suse.cz
Fixes: c33d6c06f60f ("mm, page_alloc: avoid looking up the first zone in a zonelist twice")
Signed-off-by: Vlastimil Babka &lt;vbabka@suse.cz&gt;
Reported-by: Ganapatrao Kulkarni &lt;gpkulkarni@gmail.com&gt;
Acked-by: Mel Gorman &lt;mgorman@techsingularity.net&gt;
Acked-by: Hillf Danton &lt;hillf.zj@alibaba-inc.com&gt;
Cc: Michal Hocko &lt;mhocko@suse.com&gt;
Cc: &lt;stable@vger.kernel.org&gt;
Signed-off-by: Andrew Morton &lt;akpm@linux-foundation.org&gt;
Signed-off-by: Linus Torvalds &lt;torvalds@linux-foundation.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=e47483bca2cc59a4593b37a270b16ee42b1d9f08'>Diffstat</a> (limited to 'include/sound/info.h')</div><table summary='diffstat' class='diffstat'>