147e4937aSGao Xiang# SPDX-License-Identifier: GPL-2.0-only 247e4937aSGao Xiang 347e4937aSGao Xiangconfig EROFS_FS 447e4937aSGao Xiang tristate "EROFS filesystem support" 547e4937aSGao Xiang depends on BLOCK 647e4937aSGao Xiang help 747e4937aSGao Xiang EROFS (Enhanced Read-Only File System) is a lightweight 847e4937aSGao Xiang read-only file system with modern designs (eg. page-sized 947e4937aSGao Xiang blocks, inline xattrs/data, etc.) for scenarios which need 1047e4937aSGao Xiang high-performance read-only requirements, e.g. Android OS 1147e4937aSGao Xiang for mobile phones and LIVECDs. 1247e4937aSGao Xiang 1347e4937aSGao Xiang It also provides fixed-sized output compression support, 1447e4937aSGao Xiang which improves storage density, keeps relatively higher 1547e4937aSGao Xiang compression ratios, which is more useful to achieve high 1647e4937aSGao Xiang performance for embedded devices with limited memory. 1747e4937aSGao Xiang 1847e4937aSGao Xiang If unsure, say N. 1947e4937aSGao Xiang 2047e4937aSGao Xiangconfig EROFS_FS_DEBUG 2147e4937aSGao Xiang bool "EROFS debugging feature" 2247e4937aSGao Xiang depends on EROFS_FS 2347e4937aSGao Xiang help 2447e4937aSGao Xiang Print debugging messages and enable more BUG_ONs which check 2547e4937aSGao Xiang filesystem consistency and find potential issues aggressively, 2647e4937aSGao Xiang which can be used for Android eng build, for example. 2747e4937aSGao Xiang 2847e4937aSGao Xiang For daily use, say N. 2947e4937aSGao Xiang 3047e4937aSGao Xiangconfig EROFS_FAULT_INJECTION 3147e4937aSGao Xiang bool "EROFS fault injection facility" 3247e4937aSGao Xiang depends on EROFS_FS 3347e4937aSGao Xiang help 3447e4937aSGao Xiang Test EROFS to inject faults such as ENOMEM, EIO, and so on. 3547e4937aSGao Xiang If unsure, say N. 3647e4937aSGao Xiang 3747e4937aSGao Xiangconfig EROFS_FS_XATTR 3847e4937aSGao Xiang bool "EROFS extended attributes" 3947e4937aSGao Xiang depends on EROFS_FS 4047e4937aSGao Xiang default y 4147e4937aSGao Xiang help 4247e4937aSGao Xiang Extended attributes are name:value pairs associated with inodes by 4347e4937aSGao Xiang the kernel or by users (see the attr(5) manual page, or visit 4447e4937aSGao Xiang <http://acl.bestbits.at/> for details). 4547e4937aSGao Xiang 4647e4937aSGao Xiang If unsure, say N. 4747e4937aSGao Xiang 4847e4937aSGao Xiangconfig EROFS_FS_POSIX_ACL 4947e4937aSGao Xiang bool "EROFS Access Control Lists" 5047e4937aSGao Xiang depends on EROFS_FS_XATTR 5147e4937aSGao Xiang select FS_POSIX_ACL 5247e4937aSGao Xiang default y 5347e4937aSGao Xiang help 5447e4937aSGao Xiang Posix Access Control Lists (ACLs) support permissions for users and 5547e4937aSGao Xiang groups beyond the owner/group/world scheme. 5647e4937aSGao Xiang 5747e4937aSGao Xiang To learn more about Access Control Lists, visit the POSIX ACLs for 5847e4937aSGao Xiang Linux website <http://acl.bestbits.at/>. 5947e4937aSGao Xiang 6047e4937aSGao Xiang If you don't know what Access Control Lists are, say N. 6147e4937aSGao Xiang 6247e4937aSGao Xiangconfig EROFS_FS_SECURITY 6347e4937aSGao Xiang bool "EROFS Security Labels" 6447e4937aSGao Xiang depends on EROFS_FS_XATTR 6547e4937aSGao Xiang default y 6647e4937aSGao Xiang help 6747e4937aSGao Xiang Security labels provide an access control facility to support Linux 6847e4937aSGao Xiang Security Models (LSMs) accepted by AppArmor, SELinux, Smack and TOMOYO 6947e4937aSGao Xiang Linux. This option enables an extended attribute handler for file 7047e4937aSGao Xiang security labels in the erofs filesystem, so that it requires enabling 7147e4937aSGao Xiang the extended attribute support in advance. 7247e4937aSGao Xiang 7347e4937aSGao Xiang If you are not using a security module, say N. 7447e4937aSGao Xiang 7547e4937aSGao Xiangconfig EROFS_FS_ZIP 7647e4937aSGao Xiang bool "EROFS Data Compression Support" 7747e4937aSGao Xiang depends on EROFS_FS 7847e4937aSGao Xiang select LZ4_DECOMPRESS 7947e4937aSGao Xiang default y 8047e4937aSGao Xiang help 8147e4937aSGao Xiang Enable fixed-sized output compression for EROFS. 8247e4937aSGao Xiang 8347e4937aSGao Xiang If you don't want to enable compression feature, say N. 8447e4937aSGao Xiang 8547e4937aSGao Xiangconfig EROFS_FS_CLUSTER_PAGE_LIMIT 8647e4937aSGao Xiang int "EROFS Cluster Pages Hard Limit" 8747e4937aSGao Xiang depends on EROFS_FS_ZIP 8847e4937aSGao Xiang range 1 256 8947e4937aSGao Xiang default "1" 9047e4937aSGao Xiang help 9147e4937aSGao Xiang Indicates maximum # of pages of a compressed 9247e4937aSGao Xiang physical cluster. 9347e4937aSGao Xiang 9447e4937aSGao Xiang For example, if files in a image were compressed 9547e4937aSGao Xiang into 8k-unit, hard limit should not be configured 9647e4937aSGao Xiang less than 2. Otherwise, the image will be refused 9747e4937aSGao Xiang to mount on this kernel. 9847e4937aSGao Xiang 99