| # SPDX-License-Identifier: GPL-2.0-only |
| config ROMFS_FS |
| tristate "ROM file system support" |
| depends on BLOCK || MTD |
| ---help--- |
| This is a very small read-only file system mainly intended for |
| initial ram disks of installation disks, but it could be used for |
| other read-only media as well. Read |
| <file:Documentation/filesystems/romfs.rst> for details. |
| |
| To compile this file system support as a module, choose M here: the |
| module will be called romfs. Note that the file system of your |
| root partition (the one containing the directory /) cannot be a |
| module. |
| |
| If you don't know whether you need it, then you don't need it: |
| answer N. |
| |
| # |
| # Select the backing stores to be supported |
| # |
| choice |
| prompt "RomFS backing stores" |
| depends on ROMFS_FS |
| default ROMFS_BACKED_BY_BLOCK |
| help |
| Select the backing stores to be supported. |
| |
| config ROMFS_BACKED_BY_BLOCK |
| bool "Block device-backed ROM file system support" |
| depends on BLOCK |
| help |
| This permits ROMFS to use block devices buffered through the page |
| cache as the medium from which to retrieve data. It does not allow |
| direct mapping of the medium. |
| |
| If unsure, answer Y. |
| |
| config ROMFS_BACKED_BY_MTD |
| bool "MTD-backed ROM file system support" |
| depends on MTD=y || (ROMFS_FS=m && MTD) |
| help |
| This permits ROMFS to use MTD based devices directly, without the |
| intercession of the block layer (which may have been disabled). It |
| also allows direct mapping of MTD devices through romfs files under |
| NOMMU conditions if the underlying device is directly addressable by |
| the CPU. |
| |
| If unsure, answer Y. |
| |
| config ROMFS_BACKED_BY_BOTH |
| bool "Both the above" |
| depends on BLOCK && (MTD=y || (ROMFS_FS=m && MTD)) |
| endchoice |
| |
| |
| config ROMFS_ON_BLOCK |
| bool |
| default y if ROMFS_BACKED_BY_BLOCK || ROMFS_BACKED_BY_BOTH |
| |
| config ROMFS_ON_MTD |
| bool |
| default y if ROMFS_BACKED_BY_MTD || ROMFS_BACKED_BY_BOTH |
