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Diffstat (limited to 'drivers/staging/erofs/Kconfig')
| -rw-r--r-- | drivers/staging/erofs/Kconfig | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/drivers/staging/erofs/Kconfig b/drivers/staging/erofs/Kconfig new file mode 100644 index 000000000000..96f614934df1 --- /dev/null +++ b/drivers/staging/erofs/Kconfig @@ -0,0 +1,141 @@ +# SPDX-License-Identifier: GPL-2.0 + +config EROFS_FS + tristate "EROFS filesystem support" + depends on BROKEN + 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_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 + |