Vivek Goyal 754f8cb72b ovl: do not require mounter to have MAY_WRITE on lower ... Now we have two levels of checks in ovl_permission(). overlay inode is checked with the creds of task while underlying inode is checked with the creds of mounter. Looks like mounter does not have to have WRITE access to files on lower/. So remove the MAY_WRITE from access mask for checks on underlying lower inode. This means task should still have the MAY_WRITE permission on lower inode and mounter is not required to have MAY_WRITE. It also solves the problem of read only NFS mounts being used as lower. If __inode_permission(lower_inode, MAY_WRITE) is called on read only NFS, it fails. By resetting MAY_WRITE, check succeeds and case of read only NFS shold work with overlay without having to specify any special mount options (default permission). Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>		2016-07-29 12:05:23 +02:00
..
copy_up.c	ovl: override creds with the ones from the superblock mounter	2016-05-27 08:55:26 +02:00
dir.c	ovl: do operations on underlying file system in mounter's context	2016-07-29 12:05:23 +02:00
inode.c	ovl: do not require mounter to have MAY_WRITE on lower	2016-07-29 12:05:23 +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: define ->get_acl() for overlay inodes	2016-07-29 12:05:23 +02:00
readdir.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-27 17:14:05 -07:00
super.c	ovl: define ->get_acl() for overlay inodes	2016-07-29 12:05:23 +02:00