projects / linux-2.6-block.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 |
| fd68c6a2 | 6 | help |
| 0b800f3d | 7 | EROFS (Enhanced Read-Only File System) is a lightweight |
| fd68c6a2 GX |
8 | read-only file system with modern designs (eg. page-sized |
| 9 | blocks, inline xattrs/data, etc.) for scenarios which need | |
| 0b800f3d GX |
10 | high-performance read-only requirements, e.g. Android OS |
| 11 | for mobile phones and LIVECDs. | |
| fd68c6a2 | 12 | |
| 0b800f3d GX |
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. | |
| fd68c6a2 GX |
17 | |
| 18 | If unsure, say N. | |
| 19 | ||
| 20 | config EROFS_FS_DEBUG | |
| 21 | bool "EROFS debugging feature" | |
| 22 | depends on EROFS_FS | |
| 23 | help | |
| 0b800f3d GX |
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. | |
| fd68c6a2 GX |
27 | |
| 28 | For daily use, say N. | |
| 29 | ||
| b17500a0 GX |
30 | config EROFS_FS_XATTR |
| 31 | bool "EROFS extended attributes" | |
| 32 | depends on EROFS_FS | |
| 33 | default y | |
| 34 | help | |
| 35 | Extended attributes are name:value pairs associated with inodes by | |
| 36 | the kernel or by users (see the attr(5) manual page, or visit | |
| 37 | <http://acl.bestbits.at/> for details). | |
| 38 | ||
| 39 | If unsure, say N. | |
| 40 | ||
| 41 | config EROFS_FS_POSIX_ACL | |
| 42 | bool "EROFS Access Control Lists" | |
| 43 | depends on EROFS_FS_XATTR | |
| 44 | select FS_POSIX_ACL | |
| 45 | default y | |
| 46 | help | |
| 47 | Posix Access Control Lists (ACLs) support permissions for users and | |
| 48 | groups beyond the owner/group/world scheme. | |
| 49 | ||
| 50 | To learn more about Access Control Lists, visit the POSIX ACLs for | |
| 51 | Linux website <http://acl.bestbits.at/>. | |
| 52 | ||
| 53 | If you don't know what Access Control Lists are, say N. | |
| 54 | ||
| 55 | config EROFS_FS_SECURITY | |
| 56 | bool "EROFS Security Labels" | |
| 57 | depends on EROFS_FS_XATTR | |
| 0b800f3d | 58 | default y |
| b17500a0 GX |
59 | help |
| 60 | Security labels provide an access control facility to support Linux | |
| 61 | Security Models (LSMs) accepted by AppArmor, SELinux, Smack and TOMOYO | |
| 62 | Linux. This option enables an extended attribute handler for file | |
| 63 | security labels in the erofs filesystem, so that it requires enabling | |
| 64 | the extended attribute support in advance. | |
| 65 | ||
| 66 | If you are not using a security module, say N. | |
| 67 | ||
| 02827e17 | 68 | config EROFS_FS_ZIP |
| 0b800f3d | 69 | bool "EROFS Data Compression Support" |
| 02827e17 | 70 | depends on EROFS_FS |
| 7962e63a | 71 | select LZ4_DECOMPRESS |
| 0b800f3d | 72 | default y |
| 02827e17 | 73 | help |
| 0b800f3d | 74 | Enable fixed-sized output compression for EROFS. |
| 02827e17 | 75 | |
| 0b800f3d | 76 | If you don't want to enable compression feature, say N. |
| 02827e17 | 77 | |
| 0d40d6e3 GX |
78 | config EROFS_FS_CLUSTER_PAGE_LIMIT |
| 79 | int "EROFS Cluster Pages Hard Limit" | |
| 80 | depends on EROFS_FS_ZIP | |
| 81 | range 1 256 | |
| 82 | default "1" | |
| 83 | help | |
| 0b800f3d GX |
84 | Indicates maximum # of pages of a compressed |
| 85 | physical cluster. | |
| 0d40d6e3 | 86 | |
| 0b800f3d GX |
87 | For example, if files in a image were compressed |
| 88 | into 8k-unit, hard limit should not be configured | |
| 89 | less than 2. Otherwise, the image will be refused | |
| 90 | to mount on this kernel. | |
| 0d40d6e3 | 91 |