| Miklos Szeredi | ef94b18 | 2014-11-20 16:39:59 +0100 | [diff] [blame] | 1 | config OVERLAY_FS |
| Miklos Szeredi | e9be9d5 | 2014-10-24 00:14:38 +0200 | [diff] [blame] | 2 | tristate "Overlay filesystem support" |
| Arnd Bergmann | 72d4250 | 2017-05-11 13:34:29 +0200 | [diff] [blame] | 3 | select EXPORTFS |
| Miklos Szeredi | e9be9d5 | 2014-10-24 00:14:38 +0200 | [diff] [blame] | 4 | help |
| 5 | An overlay filesystem combines two filesystems - an 'upper' filesystem |
| 6 | and a 'lower' filesystem. When a name exists in both filesystems, the |
| 7 | object in the 'upper' filesystem is visible while the object in the |
| 8 | 'lower' filesystem is either hidden or, in the case of directories, |
| 9 | merged with the 'upper' object. |
| 10 | |
| 11 | For more information see Documentation/filesystems/overlayfs.txt |
| Miklos Szeredi | 688ea0e | 2016-12-16 11:02:57 +0100 | [diff] [blame] | 12 | |
| 13 | config OVERLAY_FS_REDIRECT_DIR |
| 14 | bool "Overlayfs: turn on redirect dir feature by default" |
| 15 | depends on OVERLAY_FS |
| 16 | help |
| 17 | If this config option is enabled then overlay filesystems will use |
| 18 | redirects when renaming directories by default. In this case it is |
| 19 | still possible to turn off redirects globally with the |
| 20 | "redirect_dir=off" module option or on a filesystem instance basis |
| 21 | with the "redirect_dir=off" mount option. |
| 22 | |
| 23 | Note, that redirects are not backward compatible. That is, mounting |
| 24 | an overlay which has redirects on a kernel that doesn't support this |
| 25 | feature will have unexpected results. |