linux-kernel - [PATCH 4.2 116/120] fs: Set the size of empty dirs to 0.

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Message-Id: <20150919171732.815900751@linuxfoundation.org>
Date:	Sat, 19 Sep 2015 10:29:16 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Tejun Heo <tj@...nel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [PATCH 4.2 116/120] fs: Set the size of empty dirs to 0.

4.2-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: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/libfs.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -1185,7 +1185,7 @@ void make_empty_dir_inode(struct 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;

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