Miklos Szeredi 89f15c6e82 ovl: proper cleanup of workdir ... commit eea2fb4851 upstream. When mounting overlayfs it needs a clean "work" directory under the supplied workdir. Previously the mount code removed this directory if it already existed and created a new one. If the removal failed (e.g. directory was not empty) then it fell back to a read-only mount not using the workdir. While this has never been reported, it is possible to get a non-empty "work" dir from a previous mount of overlayfs in case of crash in the middle of an operation using the work directory. In this case the left over state should be discarded and the overlay filesystem will be consistent, guaranteed by the atomicity of operations on moving to/from the workdir to the upper layer. This patch implements cleaning out any files left in workdir. It is implemented using real recursion for simplicity, but the depth is limited to 2, because the worst case is that of a directory containing whiteouts under "work". Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Cc: <stable@vger.kernel.org> Signed-off-by: SZ Lin (林上智) <sz.lin@moxa.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2018-09-15 09:40:41 +02:00
..
copy_up.c	ovl: override creds with the ones from the superblock mounter	2018-09-15 09:40:41 +02:00
dir.c	ovl: override creds with the ones from the superblock mounter	2018-09-15 09:40:41 +02:00
inode.c	ovl: filter trusted xattr for non-admin	2018-04-13 19:50:14 +02:00
Kconfig	ovl: rename filesystem type to "overlay"	2014-11-20 16:39:59 +01:00
Makefile	ovl: rename filesystem type to "overlay"	2014-11-20 16:39:59 +01:00
overlayfs.h	ovl: proper cleanup of workdir	2018-09-15 09:40:41 +02:00
readdir.c	ovl: proper cleanup of workdir	2018-09-15 09:40:41 +02:00
super.c	ovl: proper cleanup of workdir	2018-09-15 09:40:41 +02:00