fs/erofs/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0-only
   2
   3 config EROFS_FS
   4         tristate "EROFS filesystem support"
   5         depends on BLOCK
   6         select LIBCRC32C
   7         help
   8           EROFS (Enhanced Read-Only File System) is a lightweight
   9           read-only file system with modern designs (eg. page-sized
  10           blocks, inline xattrs/data, etc.) for scenarios which need
  11           high-performance read-only requirements, e.g. Android OS
  12           for mobile phones and LIVECDs.
  13
  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.
  18
  19           If unsure, say N.
  20
  21 config EROFS_FS_DEBUG
  22         bool "EROFS debugging feature"
  23         depends on EROFS_FS
  24         help
  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.
  28
  29           For daily use, say N.
  30
  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
  59         default y
  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
  69 config EROFS_FS_ZIP
  70         bool "EROFS Data Compression Support"
  71         depends on EROFS_FS
  72         select LZ4_DECOMPRESS
  73         default y
  74         help
  75           Enable fixed-sized output compression for EROFS.
  76
  77           If you don't want to enable compression feature, say N.
  78
  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
  85           Indicates maximum # of pages of a compressed
  86           physical cluster.
  87
  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.
  92