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# SPDX-License-Identifier: GPL-2.0-only 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 directory 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. If unsure, say N. config OVERLAY_FS_REDIRECT_ALWAYS_FOLLOW bool "Overlayfs: follow redirects even if redirects are turned off" default y depends on OVERLAY_FS help 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 help If this config option is enabled then overlay filesystems will use the index directory to map lower inodes to upper inodes by default. In this case it is still possible to turn off index globally with the "index=off" module option or on a filesystem instance basis with the "index=off" mount option. The inodes index feature prevents breaking of lower hardlinks on copy up. Note, that the inodes index feature is not backward compatible. 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 depends on OVERLAY_FS_INDEX depends on !OVERLAY_FS_METACOPY help If this config option is enabled then overlay filesystems will use the index directory to decode overlay NFS file handles by default. In this case, it is still possible to turn off NFS export support globally with the "nfs_export=off" module option or on a filesystem instance basis with the "nfs_export=off" mount option. The NFS export feature creates an index on copy up of every file and directory. This full index is used to detect overlay filesystems inconsistencies on lookup, like redirect from multiple upper dirs to the same lower dir. The full index may incur some overhead on mount time, especially when verifying that directory file handles are not stale. 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. config OVERLAY_FS_XINO_AUTO bool "Overlayfs: auto enable inode number mapping" default n depends on OVERLAY_FS help If this config option is enabled then overlay filesystems will use unused high bits in undelying filesystem inode numbers to map all inodes to a unified address space. The mapped 64bit inode numbers might not be compatible with applications that expect 32bit inodes. If compatibility with applications that expect 32bit inodes is not an issue, then it is safe and recommended to say Y here. For more information, see Documentation/filesystems/overlayfs.txt If unsure, say N. config OVERLAY_FS_METACOPY bool "Overlayfs: turn on metadata only copy up feature by default" depends on OVERLAY_FS select OVERLAY_FS_REDIRECT_DIR help If this config option is enabled then overlay filesystems will copy up only metadata where appropriate and data copy up will happen when a file is opened for WRITE operation. It is still possible to turn off this feature globally with the "metacopy=off" module option or on a filesystem instance basis with the "metacopy=off" mount option. Note, that this feature is not backward compatible. That is, mounting an overlay which has metacopy only inodes on a kernel that doesn't support this feature will have unexpected results. If unsure, say N.
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