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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 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

	  feature will have unexpected results.



	  If unsure, say N.



config OVERLAY_FS_REDIRECT_ALWAYS_FOLLOW

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

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

	  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



	  If unsure, say Y.



config OVERLAY_FS_INDEX

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

	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 doesn't support this feature will have unexpected results.



	  If unsure, say N.



config OVERLAY_FS_NFS_EXPORT

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

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

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

	  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.