159 lines
4.4 KiB
Text
159 lines
4.4 KiB
Text
|
# SPDX-License-Identifier: GPL-2.0
|
||
|
|
|
||
|
|
config EROFS_FS
|
||
|
|
tristate "EROFS filesystem support"
|
||
|
|
depends on BLOCK
|
||
|
|
help
|
||
|
|
EROFS(Enhanced Read-Only File System) is a lightweight
|
||
|
|
read-only file system with modern designs (eg. page-sized
|
||
|
|
blocks, inline xattrs/data, etc.) for scenarios which need
|
||
|
|
high-performance read-only requirements, eg. firmwares in
|
||
|
|
mobile phone or LIVECDs.
|
||
|
|
|
||
|
|
It also provides VLE compression support, focusing on
|
||
|
|
random read improvements, keeping relatively lower
|
||
|
|
compression ratios, which is useful for high-performance
|
||
|
|
devices with limited memory and ROM space.
|
||
|
|
|
||
|
|
If unsure, say N.
|
||
|
|
|
||
|
|
config EROFS_FS_DEBUG
|
||
|
|
bool "EROFS debugging feature"
|
||
|
|
depends on EROFS_FS
|
||
|
|
help
|
||
|
|
Print EROFS debugging messages and enable more BUG_ONs
|
||
|
|
which check the filesystem consistency aggressively.
|
||
|
|
|
||
|
|
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
|
||
|
|
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_USE_VM_MAP_RAM
|
||
|
|
bool "EROFS VM_MAP_RAM Support"
|
||
|
|
depends on EROFS_FS
|
||
|
|
help
|
||
|
|
use vm_map_ram/vm_unmap_ram instead of vmap/vunmap.
|
||
|
|
|
||
|
|
If you don't know what these are, say N.
|
||
|
|
|
||
|
|
config EROFS_FAULT_INJECTION
|
||
|
|
bool "EROFS fault injection facility"
|
||
|
|
depends on EROFS_FS
|
||
|
|
help
|
||
|
|
Test EROFS to inject faults such as ENOMEM, EIO, and so on.
|
||
|
|
If unsure, say N.
|
||
|
|
|
||
|
|
config EROFS_FS_IO_MAX_RETRIES
|
||
|
|
int "EROFS IO Maximum Retries"
|
||
|
|
depends on EROFS_FS
|
||
|
|
default "5"
|
||
|
|
help
|
||
|
|
Maximum retry count of IO Errors.
|
||
|
|
|
||
|
|
If unsure, leave the default value (5 retries, 6 IOs at most).
|
||
|
|
|
||
|
|
config EROFS_FS_ZIP
|
||
|
|
bool "EROFS Data Compresssion Support"
|
||
|
|
depends on EROFS_FS
|
||
|
|
help
|
||
|
|
Currently we support VLE Compression only.
|
||
|
|
Play at your own risk.
|
||
|
|
|
||
|
|
If you don't want to use compression feature, say N.
|
||
|
|
|
||
|
|
config EROFS_FS_CLUSTER_PAGE_LIMIT
|
||
|
|
int "EROFS Cluster Pages Hard Limit"
|
||
|
|
depends on EROFS_FS_ZIP
|
||
|
|
range 1 256
|
||
|
|
default "1"
|
||
|
|
help
|
||
|
|
Indicates VLE compressed pages hard limit of a
|
||
|
|
compressed cluster.
|
||
|
|
|
||
|
|
For example, if files of a image are compressed
|
||
|
|
into 8k-unit, the hard limit should not be less
|
||
|
|
than 2. Otherwise, the image cannot be mounted
|
||
|
|
correctly on this kernel.
|
||
|
|
|
||
|
|
choice
|
||
|
|
prompt "EROFS VLE Data Decompression mode"
|
||
|
|
depends on EROFS_FS_ZIP
|
||
|
|
default EROFS_FS_ZIP_CACHE_BIPOLAR
|
||
|
|
help
|
||
|
|
EROFS supports three options for VLE decompression.
|
||
|
|
"In-place Decompression Only" consumes the minimum memory
|
||
|
|
with lowest random read.
|
||
|
|
|
||
|
|
"Bipolar Cached Decompression" consumes the maximum memory
|
||
|
|
with highest random read.
|
||
|
|
|
||
|
|
If unsure, select "Bipolar Cached Decompression"
|
||
|
|
|
||
|
|
config EROFS_FS_ZIP_NO_CACHE
|
||
|
|
bool "In-place Decompression Only"
|
||
|
|
help
|
||
|
|
Read compressed data into page cache and do in-place
|
||
|
|
decompression directly.
|
||
|
|
|
||
|
|
config EROFS_FS_ZIP_CACHE_UNIPOLAR
|
||
|
|
bool "Unipolar Cached Decompression"
|
||
|
|
help
|
||
|
|
For each request, it caches the last compressed page
|
||
|
|
for further reading.
|
||
|
|
It still decompresses in place for the rest compressed pages.
|
||
|
|
|
||
|
|
config EROFS_FS_ZIP_CACHE_BIPOLAR
|
||
|
|
bool "Bipolar Cached Decompression"
|
||
|
|
help
|
||
|
|
For each request, it caches the both end compressed pages
|
||
|
|
for further reading.
|
||
|
|
It still decompresses in place for the rest compressed pages.
|
||
|
|
|
||
|
|
Recommended for performance priority.
|
||
|
|
|
||
|
|
endchoice
|
||
|
|
|
||
|
|
config EROFS_FS_HUAWEI_EXTENSION
|
||
|
|
bool "EROFS HUAWEI Extension"
|
||
|
|
depends on EROFS_FS && EROFS_FS_ZIP
|
||
|
|
help
|
||
|
|
Targeted optimizations for HUAWEI Mobile phone.
|
||
|
|
|
||
|
|
If unsure, say N.
|
||
|
|
|