1# SPDX-License-Identifier: GPL-2.0-only 2 3config EROFS_FS 4 tristate "EROFS filesystem support" 5 depends on BLOCK 6 help 7 EROFS (Enhanced Read-Only File System) is a lightweight 8 read-only file system with modern designs (eg. page-sized 9 blocks, inline xattrs/data, etc.) for scenarios which need 10 high-performance read-only requirements, e.g. Android OS 11 for mobile phones and LIVECDs. 12 13 It also provides fixed-sized output compression support, 14 which improves storage density, keeps relatively higher 15 compression ratios, which is more useful to achieve high 16 performance for embedded devices with limited memory. 17 18 If unsure, say N. 19 20config EROFS_FS_DEBUG 21 bool "EROFS debugging feature" 22 depends on EROFS_FS 23 help 24 Print debugging messages and enable more BUG_ONs which check 25 filesystem consistency and find potential issues aggressively, 26 which can be used for Android eng build, for example. 27 28 For daily use, say N. 29 30config EROFS_FAULT_INJECTION 31 bool "EROFS fault injection facility" 32 depends on EROFS_FS 33 help 34 Test EROFS to inject faults such as ENOMEM, EIO, and so on. 35 If unsure, say N. 36 37config EROFS_FS_XATTR 38 bool "EROFS extended attributes" 39 depends on EROFS_FS 40 default y 41 help 42 Extended attributes are name:value pairs associated with inodes by 43 the kernel or by users (see the attr(5) manual page, or visit 44 <http://acl.bestbits.at/> for details). 45 46 If unsure, say N. 47 48config EROFS_FS_POSIX_ACL 49 bool "EROFS Access Control Lists" 50 depends on EROFS_FS_XATTR 51 select FS_POSIX_ACL 52 default y 53 help 54 Posix Access Control Lists (ACLs) support permissions for users and 55 groups beyond the owner/group/world scheme. 56 57 To learn more about Access Control Lists, visit the POSIX ACLs for 58 Linux website <http://acl.bestbits.at/>. 59 60 If you don't know what Access Control Lists are, say N. 61 62config EROFS_FS_SECURITY 63 bool "EROFS Security Labels" 64 depends on EROFS_FS_XATTR 65 default y 66 help 67 Security labels provide an access control facility to support Linux 68 Security Models (LSMs) accepted by AppArmor, SELinux, Smack and TOMOYO 69 Linux. This option enables an extended attribute handler for file 70 security labels in the erofs filesystem, so that it requires enabling 71 the extended attribute support in advance. 72 73 If you are not using a security module, say N. 74 75config EROFS_FS_ZIP 76 bool "EROFS Data Compression Support" 77 depends on EROFS_FS 78 select LZ4_DECOMPRESS 79 default y 80 help 81 Enable fixed-sized output compression for EROFS. 82 83 If you don't want to enable compression feature, say N. 84 85config EROFS_FS_CLUSTER_PAGE_LIMIT 86 int "EROFS Cluster Pages Hard Limit" 87 depends on EROFS_FS_ZIP 88 range 1 256 89 default "1" 90 help 91 Indicates maximum # of pages of a compressed 92 physical cluster. 93 94 For example, if files in a image were compressed 95 into 8k-unit, hard limit should not be configured 96 less than 2. Otherwise, the image will be refused 97 to mount on this kernel. 98 99