projects / thirdparty / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 29b24f6c | 1 | # SPDX-License-Identifier: GPL-2.0-only |
| fd68c6a2 GX |
2 | |
| 3 | config EROFS_FS | |
| 4 | tristate "EROFS filesystem support" | |
| aca19723 | 5 | depends on BLOCK |
| b858a484 | 6 | select LIBCRC32C |
| fd68c6a2 | 7 | help |
| 0b800f3d | 8 | EROFS (Enhanced Read-Only File System) is a lightweight |
| fd68c6a2 GX |
9 | read-only file system with modern designs (eg. page-sized |
| 10 | blocks, inline xattrs/data, etc.) for scenarios which need | |
| 0b800f3d GX |
11 | high-performance read-only requirements, e.g. Android OS |
| 12 | for mobile phones and LIVECDs. | |
| fd68c6a2 | 13 | |
| 0b800f3d GX |
14 | It also provides fixed-sized output compression support, |
| 15 | which improves storage density, keeps relatively higher | |
| 16 | compression ratios, which is more useful to achieve high | |
| 17 | performance for embedded devices with limited memory. | |
| fd68c6a2 GX |
18 | |
| 19 | If unsure, say N. | |
| 20 | ||
| 21 | config EROFS_FS_DEBUG | |
| 22 | bool "EROFS debugging feature" | |
| 23 | depends on EROFS_FS | |
| 24 | help | |
| 0b800f3d GX |
25 | Print debugging messages and enable more BUG_ONs which check |
| 26 | filesystem consistency and find potential issues aggressively, | |
| 27 | which can be used for Android eng build, for example. | |
| fd68c6a2 GX |
28 | |
| 29 | For daily use, say N. | |
| 30 | ||
| b17500a0 GX |
31 | config EROFS_FS_XATTR |
| 32 | bool "EROFS extended attributes" | |
| 33 | depends on EROFS_FS | |
| 34 | default y | |
| 35 | help | |
| 36 | Extended attributes are name:value pairs associated with inodes by | |
| 37 | the kernel or by users (see the attr(5) manual page, or visit | |
| 38 | <http://acl.bestbits.at/> for details). | |
| 39 | ||
| 40 | If unsure, say N. | |
| 41 | ||
| 42 | config EROFS_FS_POSIX_ACL | |
| 43 | bool "EROFS Access Control Lists" | |
| 44 | depends on EROFS_FS_XATTR | |
| 45 | select FS_POSIX_ACL | |
| 46 | default y | |
| 47 | help | |
| 48 | Posix Access Control Lists (ACLs) support permissions for users and | |
| 49 | groups beyond the owner/group/world scheme. | |
| 50 | ||
| 51 | To learn more about Access Control Lists, visit the POSIX ACLs for | |
| 52 | Linux website <http://acl.bestbits.at/>. | |
| 53 | ||
| 54 | If you don't know what Access Control Lists are, say N. | |
| 55 | ||
| 56 | config EROFS_FS_SECURITY | |
| 57 | bool "EROFS Security Labels" | |
| 58 | depends on EROFS_FS_XATTR | |
| 0b800f3d | 59 | default y |
| b17500a0 GX |
60 | help |
| 61 | Security labels provide an access control facility to support Linux | |
| 62 | Security Models (LSMs) accepted by AppArmor, SELinux, Smack and TOMOYO | |
| 63 | Linux. This option enables an extended attribute handler for file | |
| 64 | security labels in the erofs filesystem, so that it requires enabling | |
| 65 | the extended attribute support in advance. | |
| 66 | ||
| 67 | If you are not using a security module, say N. | |
| 68 | ||
| 02827e17 | 69 | config EROFS_FS_ZIP |
| 0b800f3d | 70 | bool "EROFS Data Compression Support" |
| 02827e17 | 71 | depends on EROFS_FS |
| 7962e63a | 72 | select LZ4_DECOMPRESS |
| 0b800f3d | 73 | default y |
| 02827e17 | 74 | help |
| 0b800f3d | 75 | Enable fixed-sized output compression for EROFS. |
| 02827e17 | 76 | |
| 0b800f3d | 77 | If you don't want to enable compression feature, say N. |
| 02827e17 | 78 | |
| 0d40d6e3 GX |
79 | config EROFS_FS_CLUSTER_PAGE_LIMIT |
| 80 | int "EROFS Cluster Pages Hard Limit" | |
| 81 | depends on EROFS_FS_ZIP | |
| 82 | range 1 256 | |
| 83 | default "1" | |
| 84 | help | |
| 0b800f3d GX |
85 | Indicates maximum # of pages of a compressed |
| 86 | physical cluster. | |
| 0d40d6e3 | 87 | |
| 0b800f3d GX |
88 | For example, if files in a image were compressed |
| 89 | into 8k-unit, hard limit should not be configured | |
| 90 | less than 2. Otherwise, the image will be refused | |
| 91 | to mount on this kernel. | |
| 0d40d6e3 | 92 |