lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <640ce8446a47b445ef89ed2bd61d6e92a916ecae.1723012159.git.baolin.wang@linux.alibaba.com>
Date: Wed,  7 Aug 2024 15:31:10 +0800
From: Baolin Wang <baolin.wang@...ux.alibaba.com>
To: akpm@...ux-foundation.org,
	hughd@...gle.com
Cc: willy@...radead.org,
	david@...hat.com,
	wangkefeng.wang@...wei.com,
	chrisl@...nel.org,
	ying.huang@...el.com,
	21cnbao@...il.com,
	ryan.roberts@....com,
	shy828301@...il.com,
	ziy@...dia.com,
	ioworker0@...il.com,
	da.gomez@...sung.com,
	p.raghav@...sung.com,
	baolin.wang@...ux.alibaba.com,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v4 05/10] mm: filemap: use xa_get_order() to get the swap entry order

In the following patches, shmem will support the swap out of large folios,
which means the shmem mappings may contain large order swap entries, so
using xa_get_order() to get the folio order of the shmem swap entry to
update the '*start' correctly.

Signed-off-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
---
 mm/filemap.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mm/filemap.c b/mm/filemap.c
index 4130be74f6fd..4c312aab8b1f 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2056,6 +2056,8 @@ unsigned find_get_entries(struct address_space *mapping, pgoff_t *start,
 		folio = fbatch->folios[idx];
 		if (!xa_is_value(folio))
 			nr = folio_nr_pages(folio);
+		else
+			nr = 1 << xa_get_order(&mapping->i_pages, indices[idx]);
 		*start = indices[idx] + nr;
 	}
 	return folio_batch_count(fbatch);
@@ -2120,6 +2122,8 @@ unsigned find_lock_entries(struct address_space *mapping, pgoff_t *start,
 		folio = fbatch->folios[idx];
 		if (!xa_is_value(folio))
 			nr = folio_nr_pages(folio);
+		else
+			nr = 1 << xa_get_order(&mapping->i_pages, indices[idx]);
 		*start = indices[idx] + nr;
 	}
 	return folio_batch_count(fbatch);
-- 
2.39.3


Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ