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: Miklos Szeredi <mszeredi@redhat.com>
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@ -24,6 +24,8 @@ config OVERLAY_FS_REDIRECT_DIR
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an overlay which has redirects on a kernel that doesn't support this
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feature will have unexpected results.
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If unsure, say N.
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config OVERLAY_FS_REDIRECT_ALWAYS_FOLLOW
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bool "Overlayfs: follow redirects even if redirects are turned off"
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default y
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@ -32,8 +34,13 @@ config OVERLAY_FS_REDIRECT_ALWAYS_FOLLOW
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Disable this to get a possibly more secure configuration, but that
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might not be backward compatible with previous kernels.
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If backward compatibility is not an issue, then it is safe and
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recommended to say N here.
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For more information, see Documentation/filesystems/overlayfs.txt
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If unsure, say Y.
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config OVERLAY_FS_INDEX
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bool "Overlayfs: turn on inodes index feature by default"
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depends on OVERLAY_FS
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@ -51,6 +58,8 @@ config OVERLAY_FS_INDEX
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That is, mounting an overlay which has an inodes index on a kernel
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that doesn't support this feature will have unexpected results.
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If unsure, say N.
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config OVERLAY_FS_NFS_EXPORT
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bool "Overlayfs: turn on NFS export feature by default"
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depends on OVERLAY_FS
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@ -72,3 +81,8 @@ config OVERLAY_FS_NFS_EXPORT
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Note, that the NFS export feature is not backward compatible.
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That is, mounting an overlay which has a full index on a kernel
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that doesn't support this feature will have unexpected results.
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Most users should say N here and enable this feature on a case-by-
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case basis with the "nfs_export=on" mount option.
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Say N unless you fully understand the consequences.
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