| # SPDX-License-Identifier: GPL-2.0-only |
| |
| config EROFS_FS |
| tristate "EROFS filesystem support" |
| depends on BLOCK |
| select LIBCRC32C |
| help |
| EROFS (Enhanced Read-Only File System) is a lightweight |
| read-only file system with modern designs (eg. page-sized |
| blocks, inline xattrs/data, etc.) for scenarios which need |
| high-performance read-only requirements, e.g. Android OS |
| for mobile phones and LIVECDs. |
| |
| It also provides fixed-sized output compression support, |
| which improves storage density, keeps relatively higher |
| compression ratios, which is more useful to achieve high |
| performance for embedded devices with limited memory. |
| |
| If unsure, say N. |
| |
| config EROFS_FS_DEBUG |
| bool "EROFS debugging feature" |
| depends on EROFS_FS |
| help |
| Print debugging messages and enable more BUG_ONs which check |
| filesystem consistency and find potential issues aggressively, |
| which can be used for Android eng build, for example. |
| |
| For daily use, say N. |
| |
| config EROFS_FS_XATTR |
| bool "EROFS extended attributes" |
| depends on EROFS_FS |
| default y |
| help |
| Extended attributes are name:value pairs associated with inodes by |
| the kernel or by users (see the attr(5) manual page, or visit |
| <http://acl.bestbits.at/> for details). |
| |
| If unsure, say N. |
| |
| config EROFS_FS_POSIX_ACL |
| bool "EROFS Access Control Lists" |
| depends on EROFS_FS_XATTR |
| select FS_POSIX_ACL |
| default y |
| help |
| Posix Access Control Lists (ACLs) support permissions for users and |
| groups beyond the owner/group/world scheme. |
| |
| To learn more about Access Control Lists, visit the POSIX ACLs for |
| Linux website <http://acl.bestbits.at/>. |
| |
| If you don't know what Access Control Lists are, say N. |
| |
| config EROFS_FS_SECURITY |
| bool "EROFS Security Labels" |
| depends on EROFS_FS_XATTR |
| default y |
| help |
| Security labels provide an access control facility to support Linux |
| Security Models (LSMs) accepted by AppArmor, SELinux, Smack and TOMOYO |
| Linux. This option enables an extended attribute handler for file |
| security labels in the erofs filesystem, so that it requires enabling |
| the extended attribute support in advance. |
| |
| If you are not using a security module, say N. |
| |
| config EROFS_FS_ZIP |
| bool "EROFS Data Compression Support" |
| depends on EROFS_FS |
| select LZ4_DECOMPRESS |
| default y |
| help |
| Enable fixed-sized output compression for EROFS. |
| |
| If you don't want to enable compression feature, say N. |
| |
| config EROFS_FS_CLUSTER_PAGE_LIMIT |
| int "EROFS Cluster Pages Hard Limit" |
| depends on EROFS_FS_ZIP |
| range 1 256 |
| default "1" |
| help |
| Indicates maximum # of pages of a compressed |
| physical cluster. |
| |
| For example, if files in a image were compressed |
| into 8k-unit, hard limit should not be configured |
| less than 2. Otherwise, the image will be refused |
| to mount on this kernel. |
| |
