projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| fd68c6a2 GX |
1 | # SPDX-License-Identifier: GPL-2.0 |
| 2 | ||
| 3 | config EROFS_FS | |
| 4 | tristate "EROFS filesystem support" | |
| f86cf25a | 5 | depends on BLOCK |
| fd68c6a2 GX |
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, eg. firmwares in | |
| 11 | mobile phone or LIVECDs. | |
| 12 | ||
| 13 | It also provides VLE compression support, focusing on | |
| 14 | random read improvements, keeping relatively lower | |
| 15 | compression ratios, which is useful for high-performance | |
| 16 | devices with limited memory and ROM space. | |
| 17 | ||
| 18 | If unsure, say N. | |
| 19 | ||
| 20 | config EROFS_FS_DEBUG | |
| 21 | bool "EROFS debugging feature" | |
| 22 | depends on EROFS_FS | |
| 23 | help | |
| 24 | Print EROFS debugging messages and enable more BUG_ONs | |
| 25 | which check the filesystem consistency aggressively. | |
| 26 | ||
| 27 | For daily use, say N. | |
| 28 | ||
| b17500a0 GX |
29 | config EROFS_FS_XATTR |
| 30 | bool "EROFS extended attributes" | |
| 31 | depends on EROFS_FS | |
| 32 | default y | |
| 33 | help | |
| 34 | Extended attributes are name:value pairs associated with inodes by | |
| 35 | the kernel or by users (see the attr(5) manual page, or visit | |
| 36 | <http://acl.bestbits.at/> for details). | |
| 37 | ||
| 38 | If unsure, say N. | |
| 39 | ||
| 40 | config EROFS_FS_POSIX_ACL | |
| 41 | bool "EROFS Access Control Lists" | |
| 42 | depends on EROFS_FS_XATTR | |
| 43 | select FS_POSIX_ACL | |
| 44 | default y | |
| 45 | help | |
| 46 | Posix Access Control Lists (ACLs) support permissions for users and | |
| 47 | groups beyond the owner/group/world scheme. | |
| 48 | ||
| 49 | To learn more about Access Control Lists, visit the POSIX ACLs for | |
| 50 | Linux website <http://acl.bestbits.at/>. | |
| 51 | ||
| 52 | If you don't know what Access Control Lists are, say N. | |
| 53 | ||
| 54 | config EROFS_FS_SECURITY | |
| 55 | bool "EROFS Security Labels" | |
| 56 | depends on EROFS_FS_XATTR | |
| 57 | help | |
| 58 | Security labels provide an access control facility to support Linux | |
| 59 | Security Models (LSMs) accepted by AppArmor, SELinux, Smack and TOMOYO | |
| 60 | Linux. This option enables an extended attribute handler for file | |
| 61 | security labels in the erofs filesystem, so that it requires enabling | |
| 62 | the extended attribute support in advance. | |
| 63 | ||
| 64 | If you are not using a security module, say N. | |
| 65 | ||
| fd68c6a2 GX |
66 | config EROFS_FS_USE_VM_MAP_RAM |
| 67 | bool "EROFS VM_MAP_RAM Support" | |
| 68 | depends on EROFS_FS | |
| 69 | help | |
| 70 | use vm_map_ram/vm_unmap_ram instead of vmap/vunmap. | |
| 71 | ||
| 72 | If you don't know what these are, say N. | |
| 73 | ||
| 9c07b3b3 CY |
74 | config EROFS_FAULT_INJECTION |
| 75 | bool "EROFS fault injection facility" | |
| 76 | depends on EROFS_FS | |
| 77 | help | |
| 78 | Test EROFS to inject faults such as ENOMEM, EIO, and so on. | |
| 79 | If unsure, say N. | |
| 02827e17 GX |
80 | |
| 81 | config EROFS_FS_ZIP | |
| 82 | bool "EROFS Data Compresssion Support" | |
| 83 | depends on EROFS_FS | |
| 84 | help | |
| 85 | Currently we support VLE Compression only. | |
| 86 | Play at your own risk. | |
| 87 | ||
| 88 | If you don't want to use compression feature, say N. | |
| 89 | ||
| 0d40d6e3 GX |
90 | config EROFS_FS_CLUSTER_PAGE_LIMIT |
| 91 | int "EROFS Cluster Pages Hard Limit" | |
| 92 | depends on EROFS_FS_ZIP | |
| 93 | range 1 256 | |
| 94 | default "1" | |
| 95 | help | |
| 96 | Indicates VLE compressed pages hard limit of a | |
| 97 | compressed cluster. | |
| 98 | ||
| 99 | For example, if files of a image are compressed | |
| 100 | into 8k-unit, the hard limit should not be less | |
| 101 | than 2. Otherwise, the image cannot be mounted | |
| 102 | correctly on this kernel. | |
| 103 | ||
| 105d4ad8 GX |
104 | choice |
| 105 | prompt "EROFS VLE Data Decompression mode" | |
| 106 | depends on EROFS_FS_ZIP | |
| 107 | default EROFS_FS_ZIP_CACHE_BIPOLAR | |
| 108 | help | |
| 109 | EROFS supports three options for VLE decompression. | |
| 110 | "In-place Decompression Only" consumes the minimum memory | |
| 111 | with lowest random read. | |
| 112 | ||
| 113 | "Bipolar Cached Decompression" consumes the maximum memory | |
| 114 | with highest random read. | |
| 115 | ||
| 116 | If unsure, select "Bipolar Cached Decompression" | |
| 117 | ||
| 118 | config EROFS_FS_ZIP_NO_CACHE | |
| 119 | bool "In-place Decompression Only" | |
| 120 | help | |
| 121 | Read compressed data into page cache and do in-place | |
| 122 | decompression directly. | |
| 123 | ||
| 124 | config EROFS_FS_ZIP_CACHE_UNIPOLAR | |
| 125 | bool "Unipolar Cached Decompression" | |
| 126 | help | |
| 127 | For each request, it caches the last compressed page | |
| 128 | for further reading. | |
| 129 | It still decompresses in place for the rest compressed pages. | |
| 130 | ||
| 131 | config EROFS_FS_ZIP_CACHE_BIPOLAR | |
| 132 | bool "Bipolar Cached Decompression" | |
| 133 | help | |
| 134 | For each request, it caches the both end compressed pages | |
| 135 | for further reading. | |
| 136 | It still decompresses in place for the rest compressed pages. | |
| 137 | ||
| 138 | Recommended for performance priority. | |
| 139 | ||
| 140 | endchoice | |
| 141 |