Miklos Szeredi 2aff4534b6 ovl: check lower existence when removing ... Currently ovl_lookup() checks existence of lower file even if there's a non-directory on upper (which is always opaque). This is done so that remove can decide whether a whiteout is needed or not. It would be better to defer this check to unlink, since most of the time the gathered information about opaqueness will be unused. This adds a helper ovl_lower_positive() that checks if there's anything on the lower layer(s). The following patches also introduce changes to how the "opaque" attribute is updated on directories: this attribute is added when the directory is creted or moved over a whiteout or object covering something on the lower layer. However following changes will allow the attribute to remain on the directory after being moved, even if the new location doesn't cover anything. Because of this, we need to check lower layers even for opaque directories, so that whiteout is only created when necessary. This function will later be also used to decide about marking a directory opaque, so deal with negative dentries as well. When dealing with negative, it's enough to check for being a whiteout If the dentry is positive but not upper then it also obviously needs whiteout/opaque. Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>		2016-12-16 11:02:55 +01:00
..
copy_up.c	ovl: use vfs_clone_file_range() for copy up if possible	2016-12-16 11:02:54 +01:00
dir.c	ovl: check lower existence when removing	2016-12-16 11:02:55 +01:00
inode.c	ovl: treat special files like a regular fs	2016-12-16 11:02:55 +01:00
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: check lower existence when removing	2016-12-16 11:02:55 +01:00
readdir.c	ovl: proper cleanup of workdir	2016-09-01 11:11:59 +02:00
super.c	ovl: check lower existence when removing	2016-12-16 11:02:55 +01:00