Commit 36cd95df authored by Miklos Szeredi's avatar Miklos Szeredi
Browse files

ovl: update Kconfig texts 



Add some hints about overlayfs kernel config options.

Enabling NFS export by default is especially recommended against, as it
incurs a performance penalty even if the filesystem is not actually
exported.

Signed-off-by: default avatarMiklos Szeredi <mszeredi@redhat.com>
parent d1fe96c0

fs/overlayfs/Kconfig

+14 −0
Original line number Original line Diff line number Diff line
@@ -24,6 +24,8 @@ config OVERLAY_FS_REDIRECT_DIR 
	  an overlay which has redirects on a kernel that doesn't support this

	  an overlay which has redirects on a kernel that doesn't support this

	  feature will have unexpected results.

	  feature will have unexpected results.





	  If unsure, say N.



config OVERLAY_FS_REDIRECT_ALWAYS_FOLLOW

config OVERLAY_FS_REDIRECT_ALWAYS_FOLLOW

	bool "Overlayfs: follow redirects even if redirects are turned off"

	bool "Overlayfs: follow redirects even if redirects are turned off"

	default y

	default y
@@ -32,8 +34,13 @@ config OVERLAY_FS_REDIRECT_ALWAYS_FOLLOW 
	  Disable this to get a possibly more secure configuration, but that

	  Disable this to get a possibly more secure configuration, but that

	  might not be backward compatible with previous kernels.

	  might not be backward compatible with previous kernels.





	  If backward compatibility is not an issue, then it is safe and

	  recommended to say N here.



	  For more information, see Documentation/filesystems/overlayfs.txt

	  For more information, see Documentation/filesystems/overlayfs.txt





	  If unsure, say Y.



config OVERLAY_FS_INDEX

config OVERLAY_FS_INDEX

	bool "Overlayfs: turn on inodes index feature by default"

	bool "Overlayfs: turn on inodes index feature by default"

	depends on OVERLAY_FS

	depends on OVERLAY_FS
@@ -51,6 +58,8 @@ config OVERLAY_FS_INDEX 
	  That is, mounting an overlay which has an inodes index on a kernel

	  That is, mounting an overlay which has an inodes index on a kernel

	  that doesn't support this feature will have unexpected results.

	  that doesn't support this feature will have unexpected results.





	  If unsure, say N.



config OVERLAY_FS_NFS_EXPORT

config OVERLAY_FS_NFS_EXPORT

	bool "Overlayfs: turn on NFS export feature by default"

	bool "Overlayfs: turn on NFS export feature by default"

	depends on OVERLAY_FS

	depends on OVERLAY_FS
@@ -72,3 +81,8 @@ config OVERLAY_FS_NFS_EXPORT 
	  Note, that the NFS export feature is not backward compatible.

	  Note, that the NFS export feature is not backward compatible.

	  That is, mounting an overlay which has a full index on a kernel

	  That is, mounting an overlay which has a full index on a kernel

	  that doesn't support this feature will have unexpected results.

	  that doesn't support this feature will have unexpected results.



	  Most users should say N here and enable this feature on a case-by-

	  case basis with the "nfs_export=on" mount option.



	  Say N unless you fully understand the consequences.