| config OVERLAY_FS |
| tristate "Overlay filesystem support" |
| select EXPORTFS |
| help |
| An overlay filesystem combines two filesystems - an 'upper' filesystem |
| and a 'lower' filesystem. When a name exists in both filesystems, the |
| object in the 'upper' filesystem is visible while the object in the |
| 'lower' filesystem is either hidden or, in the case of directories, |
| merged with the 'upper' object. |
| |
| For more information see Documentation/filesystems/overlayfs.txt |
| |
| config OVERLAY_FS_REDIRECT_DIR |
| bool "Overlayfs: turn on redirect dir feature by default" |
| depends on OVERLAY_FS |
| help |
| If this config option is enabled then overlay filesystems will use |
| redirects when renaming directories by default. In this case it is |
| still possible to turn off redirects globally with the |
| "redirect_dir=off" module option or on a filesystem instance basis |
| with the "redirect_dir=off" mount option. |
| |
| Note, that redirects are not backward compatible. That is, mounting |
| an overlay which has redirects on a kernel that doesn't support this |
| feature will have unexpected results. |
