linux-ext4 - [PATCH 4/5] ext4: Use ext4_get_block

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 for Android: free password hash cracker in your pocket

[<prev] [next>] [day] [month] [year] [list]

Message-Id: <1435608152-6982-5-git-send-email-matthew.r.wilcox@intel.com>
Date:	Mon, 29 Jun 2015 16:02:31 -0400
From:	Matthew Wilcox <matthew.r.wilcox@...el.com>
To:	linux-fsdevel@...r.kernel.org,
	Alexander Viro <viro@...iv.linux.org.uk>
Cc:	Matthew Wilcox <willy@...ux.intel.com>,
	"Theodore Ts'o" <tytso@....edu>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	linux-ext4@...r.kernel.org
Subject: [PATCH 4/5] ext4: Use ext4_get_block_write() for DAX

From: Matthew Wilcox <willy@...ux.intel.com>

DAX relies on the get_block function either zeroing newly allocated blocks
before they're findable by subsequent calls to get_block, or marking newly
allocated blocks as unwritten.  ext4_get_block() cannot create unwritten
extents, but ext4_get_block_write() can.

Reported-by: Andy Rudoff <andy.rudoff@...el.com>
Signed-off-by: Matthew Wilcox <willy@...ux.intel.com>
---
 fs/ext4/file.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index ac517f1..f66f3da 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -194,13 +194,12 @@ out:
 #ifdef CONFIG_FS_DAX
 static int ext4_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 {
-	return dax_fault(vma, vmf, ext4_get_block);
-					/* Is this the right get_block? */
+	return dax_fault(vma, vmf, ext4_get_block_write);
 }
 
 static int ext4_dax_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
 {
-	return dax_mkwrite(vma, vmf, ext4_get_block);
+	return dax_mkwrite(vma, vmf, ext4_get_block_write);
 }
 
 static const struct vm_operations_struct ext4_dax_vm_ops = {
-- 
2.1.4

--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html