101 lines
3.2 KiB
Plaintext
101 lines
3.2 KiB
Plaintext
|
# SPDX-License-Identifier: GPL-2.0-only
|
||
|
|
|
||
|
|
config EROFS_FS
|
||
|
|
tristate "EROFS filesystem support"
|
||
|
|
depends on BLOCK
|
||
|
|
select FS_IOMAP
|
||
|
|
select LIBCRC32C
|
||
|
|
help
|
||
|
|
EROFS (Enhanced Read-Only File System) is a lightweight read-only
|
||
|
|
file system with modern designs (e.g. no buffer heads, inline
|
||
|
|
xattrs/data, chunk-based deduplication, multiple devices, etc.) for
|
||
|
|
scenarios which need high-performance read-only solutions, e.g.
|
||
|
|
smartphones with Android OS, LiveCDs and high-density hosts with
|
||
|
|
numerous containers;
|
||
|
|
|
||
|
|
It also provides fixed-sized output compression support in order to
|
||
|
|
improve storage density as well as keep relatively higher compression
|
||
|
|
ratios and implements in-place decompression to reuse the file page
|
||
|
|
for compressed data temporarily with proper strategies, which is
|
||
|
|
quite useful to ensure guaranteed end-to-end runtime decompression
|
||
|
|
performance under extremely memory pressure without extra cost.
|
||
|
|
|
||
|
|
See the documentation at <file:Documentation/filesystems/erofs.rst>
|
||
|
|
for more details.
|
||
|
|
|
||
|
|
If unsure, say N.
|
||
|
|
|
||
|
|
config EROFS_FS_DEBUG
|
||
|
|
bool "EROFS debugging feature"
|
||
|
|
depends on EROFS_FS
|
||
|
|
help
|
||
|
|
Print debugging messages and enable more BUG_ONs which check
|
||
|
|
filesystem consistency and find potential issues aggressively,
|
||
|
|
which can be used for Android eng build, for example.
|
||
|
|
|
||
|
|
For daily use, say N.
|
||
|
|
|
||
|
|
config EROFS_FS_XATTR
|
||
|
|
bool "EROFS extended attributes"
|
||
|
|
depends on EROFS_FS
|
||
|
|
default y
|
||
|
|
help
|
||
|
|
Extended attributes are name:value pairs associated with inodes by
|
||
|
|
the kernel or by users (see the attr(5) manual page, or visit
|
||
|
|
<http://acl.bestbits.at/> for details).
|
||
|
|
|
||
|
|
If unsure, say N.
|
||
|
|
|
||
|
|
config EROFS_FS_POSIX_ACL
|
||
|
|
bool "EROFS Access Control Lists"
|
||
|
|
depends on EROFS_FS_XATTR
|
||
|
|
select FS_POSIX_ACL
|
||
|
|
default y
|
||
|
|
help
|
||
|
|
Posix Access Control Lists (ACLs) support permissions for users and
|
||
|
|
groups beyond the owner/group/world scheme.
|
||
|
|
|
||
|
|
To learn more about Access Control Lists, visit the POSIX ACLs for
|
||
|
|
Linux website <http://acl.bestbits.at/>.
|
||
|
|
|
||
|
|
If you don't know what Access Control Lists are, say N.
|
||
|
|
|
||
|
|
config EROFS_FS_SECURITY
|
||
|
|
bool "EROFS Security Labels"
|
||
|
|
depends on EROFS_FS_XATTR
|
||
|
|
default y
|
||
|
|
help
|
||
|
|
Security labels provide an access control facility to support Linux
|
||
|
|
Security Models (LSMs) accepted by AppArmor, SELinux, Smack and TOMOYO
|
||
|
|
Linux. This option enables an extended attribute handler for file
|
||
|
|
security labels in the erofs filesystem, so that it requires enabling
|
||
|
|
the extended attribute support in advance.
|
||
|
|
|
||
|
|
If you are not using a security module, say N.
|
||
|
|
|
||
|
|
config EROFS_FS_ZIP
|
||
|
|
bool "EROFS Data Compression Support"
|
||
|
|
depends on EROFS_FS
|
||
|
|
select LZ4_DECOMPRESS
|
||
|
|
default y
|
||
|
|
help
|
||
|
|
Enable fixed-sized output compression for EROFS.
|
||
|
|
|
||
|
|
If you don't want to enable compression feature, say N.
|
||
|
|
|
||
|
|
config EROFS_FS_ZIP_LZMA
|
||
|
|
bool "EROFS LZMA compressed data support"
|
||
|
|
depends on EROFS_FS_ZIP
|
||
|
|
select XZ_DEC
|
||
|
|
select XZ_DEC_MICROLZMA
|
||
|
|
help
|
||
|
|
Saying Y here includes support for reading EROFS file systems
|
||
|
|
containing LZMA compressed data, specifically called microLZMA. it
|
||
|
|
gives better compression ratios than the LZ4 algorithm, at the
|
||
|
|
expense of more CPU overhead.
|
||
|
|
|
||
|
|
LZMA support is an experimental feature for now and so most file
|
||
|
|
systems will be readable without selecting this option.
|
||
|
|
|
||
|
|
If unsure, say N.
|