linux-kernel - [EXT4 set 9][PATCH 1/5]Morecleanups:ext4-zero_user

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>] [day] [month] [year] [list]

Message-Id: <1183275512.4010.137.camel@localhost.localdomain>
Date:	Sun, 01 Jul 2007 03:38:32 -0400
From:	Mingming Cao <cmm@...ibm.com>
To:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-ext4@...r.kernel.org
Subject: [EXT4 set 9][PATCH 1/5]Morecleanups:ext4-zero_user_page

Use zero_user_page() in ext4 where possible.


Signed-off-by: Eric Sandeen <sandeen@...hat.com>

Index: linux-2.6.22-rc4-mm2/fs/ext4/inode.c
===================================================================
--- linux-2.6.22-rc4-mm2.orig/fs/ext4/inode.c
+++ linux-2.6.22-rc4-mm2/fs/ext4/inode.c
@@ -1830,7 +1830,6 @@ int ext4_block_truncate_page(handle_t *h
 	struct inode *inode = mapping->host;
 	struct buffer_head *bh;
 	int err = 0;
-	void *kaddr;

 	if ((EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL) &&
 			test_opt(inode->i_sb, EXTENTS) &&
@@ -1847,10 +1846,7 @@ int ext4_block_truncate_page(handle_t *h
 	 */
 	if (!page_has_buffers(page) && test_opt(inode->i_sb, NOBH) &&
 	     ext4_should_writeback_data(inode) && PageUptodate(page)) {
-		kaddr = kmap_atomic(page, KM_USER0);
-		memset(kaddr + offset, 0, length);
-		flush_dcache_page(page);
-		kunmap_atomic(kaddr, KM_USER0);
+		zero_user_page(page, offset, length, KM_USER0);
 		set_page_dirty(page);
 		goto unlock;
 	}
@@ -1903,10 +1899,7 @@ int ext4_block_truncate_page(handle_t *h
 			goto unlock;
 	}

-	kaddr = kmap_atomic(page, KM_USER0);
-	memset(kaddr + offset, 0, length);
-	flush_dcache_page(page);
-	kunmap_atomic(kaddr, KM_USER0);
+	zero_user_page(page, offset, length, KM_USER0);

 	BUFFER_TRACE(bh, "zeroed end of block");



-
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/