linux-kernel - [PATCH 3.19.y-ckt 037/156] fs: Set the size of empty dirs to 0.

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Message-Id: <1445377097-9921-38-git-send-email-kamal@canonical.com>
Date:	Tue, 20 Oct 2015 14:36:18 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 037/156] fs: Set the size of empty dirs to 0.

3.19.8-ckt8 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: "Eric W. Biederman" <ebiederm@...ssion.com>

commit 4b75de8615050c1b0dd8d7794838c42f74ed36ba upstream.

Before the make_empty_dir_inode calls were introduce into proc, sysfs,
and sysctl those directories when stated reported an i_size of 0.
make_empty_dir_inode started reporting an i_size of 2.  At least one
userspace application depended on stat returning i_size of 0.  So
modify make_empty_dir_inode to cause an i_size of 0 to be reported for
these directories.

Reported-by: Tejun Heo <tj@...nel.org>
Acked-by: Tejun Heo <tj@...nel.org>
Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 fs/libfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/libfs.c b/fs/libfs.c
index e5dc742..3a5deb3 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -1176,7 +1176,7 @@ void make_empty_dir_inode(struct inode *inode)
 	inode->i_uid = GLOBAL_ROOT_UID;
 	inode->i_gid = GLOBAL_ROOT_GID;
 	inode->i_rdev = 0;
-	inode->i_size = 2;
+	inode->i_size = 0;
 	inode->i_blkbits = PAGE_SHIFT;
 	inode->i_blocks = 0;
 
-- 
1.9.1

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