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

From: Greg Kroah-Hartman
Date: Sat Sep 19 2015 - 13:52:03 EST


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

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

From: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>

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@xxxxxxxxxx>
Acked-by: Tejun Heo <tj@xxxxxxxxxx>
Signed-off-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
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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