linux-kernel - [PATCH 1/2] f2fs: cover number of dirty node pages under node

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-next>] [day] [month] [year] [list]

Message-Id: <1442336146-82492-1-git-send-email-jaegeuk@kernel.org>
Date:	Tue, 15 Sep 2015 09:55:45 -0700
From:	Jaegeuk Kim <jaegeuk@...nel.org>
To:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net
Cc:	Jaegeuk Kim <jaegeuk@...nel.org>
Subject: [PATCH 1/2] f2fs: cover number of dirty node pages under node_write lock

This number is referenced by checkpoint under node_write lock.

Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
 fs/f2fs/node.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 27d1a74..4d9bedf 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1323,23 +1323,24 @@ static int f2fs_write_node_page(struct page *page,
 	nid = nid_of_node(page);
 	f2fs_bug_on(sbi, page->index != nid);
 
+	if (wbc->for_reclaim) {
+		if (!down_read_trylock(&sbi->node_write))
+			goto redirty_out;
+	} else {
+		down_read(&sbi->node_write);
+	}
+
 	get_node_info(sbi, nid, &ni);
 
 	/* This page is already truncated */
 	if (unlikely(ni.blk_addr == NULL_ADDR)) {
 		ClearPageUptodate(page);
 		dec_page_count(sbi, F2FS_DIRTY_NODES);
+		up_read(&sbi->node_write);
 		unlock_page(page);
 		return 0;
 	}
 
-	if (wbc->for_reclaim) {
-		if (!down_read_trylock(&sbi->node_write))
-			goto redirty_out;
-	} else {
-		down_read(&sbi->node_write);
-	}
-
 	set_page_writeback(page);
 	fio.blk_addr = ni.blk_addr;
 	write_node_page(nid, &fio);
-- 
2.1.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/