linux-kernel - [PATCH v3 1/1] vfs: iversion truncate bug fix

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Date:	Thu, 22 Dec 2011 12:54:28 +0200
From:	Dmitry Kasatkin <dmitry.kasatkin@...el.com>
To:	linux-fsdevel@...r.kernel.org,
	linux-security-module@...r.kernel.org
Cc:	akpm@...ux-foundation.org, viro@...iv.linux.org.uk,
	linux-kernel@...r.kernel.org, zohar@...ux.vnet.ibm.com,
	Dmitry Kasatkin <dmitry.kasatkin@...el.com>
Subject: [PATCH v3 1/1] vfs: iversion truncate bug fix

When a file is truncated with truncate()/ftruncate() and then closed,
iversion is not updated. This patch uses ATTR_SIZE flag as an indication
to increment iversion.

Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@...el.com>
---
 fs/attr.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/fs/attr.c b/fs/attr.c
index 7ee7ba4..b8f55c4 100644
--- a/fs/attr.c
+++ b/fs/attr.c
@@ -176,6 +176,11 @@ int notify_change(struct dentry * dentry, struct iattr * attr)
 			return -EPERM;
 	}
 
+	if ((ia_valid & ATTR_SIZE) && IS_I_VERSION(inode)) {
+		if (attr->ia_size != inode->i_size)
+			inode_inc_iversion(inode);
+	}
+
 	if ((ia_valid & ATTR_MODE)) {
 		mode_t amode = attr->ia_mode;
 		/* Flag setting protected by i_mutex */
-- 
1.7.4.1

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