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The EROFS filesystem has many configurable options, controlled through boolean Kconfig symbols. When enabled, these options may need to enable additional library functionality elsewhere. Currently this is done by selecting the symbol for the additional functionality. However, if EROFS_FS itself is modular, and the target symbol is a tristate symbol, the additional functionality is always forced built-in. Selecting tristate symbols from a tristate symbol does keep modular transitivity. Hence fix this by moving selects of tristate symbols to the main EROFS_FS symbol. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com> Link: https://lore.kernel.org/r/da1b899e511145dd43fd2d398f64b2e03c6a39e7.1753879351.git.geert+renesas@glider.be Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
197 lines
6.5 KiB
Plaintext
197 lines
6.5 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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config EROFS_FS
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tristate "EROFS filesystem support"
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depends on BLOCK
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select CACHEFILES if EROFS_FS_ONDEMAND
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select CRC32
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select CRYPTO if EROFS_FS_ZIP_ACCEL
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select CRYPTO_DEFLATE if EROFS_FS_ZIP_ACCEL
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select FS_IOMAP
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select LZ4_DECOMPRESS if EROFS_FS_ZIP
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select NETFS_SUPPORT if EROFS_FS_ONDEMAND
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select XXHASH if EROFS_FS_XATTR
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select XZ_DEC if EROFS_FS_ZIP_LZMA
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select XZ_DEC_MICROLZMA if EROFS_FS_ZIP_LZMA
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select ZLIB_INFLATE if EROFS_FS_ZIP_DEFLATE
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select ZSTD_DECOMPRESS if EROFS_FS_ZIP_ZSTD
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help
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EROFS (Enhanced Read-Only File System) is a lightweight read-only
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file system with modern designs (e.g. no buffer heads, inline
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xattrs/data, chunk-based deduplication, multiple devices, etc.) for
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scenarios which need high-performance read-only solutions, e.g.
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smartphones with Android OS, LiveCDs and high-density hosts with
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numerous containers;
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It also provides transparent compression and deduplication support to
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improve storage density and maintain relatively high compression
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ratios, and it implements in-place decompression to temporarily reuse
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page cache for compressed data using proper strategies, which is
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quite useful for ensuring guaranteed end-to-end runtime decompression
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performance under extreme memory pressure without extra cost.
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See the documentation at <file:Documentation/filesystems/erofs.rst>
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and the web pages at <https://erofs.docs.kernel.org> for more details.
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If unsure, say N.
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config EROFS_FS_DEBUG
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bool "EROFS debugging feature"
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depends on EROFS_FS
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help
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Print debugging messages and enable more BUG_ONs which check
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filesystem consistency and find potential issues aggressively,
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which can be used for Android eng build, for example.
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For daily use, say N.
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config EROFS_FS_XATTR
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bool "EROFS extended attributes"
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depends on EROFS_FS
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default y
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help
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Extended attributes are name:value pairs associated with inodes by
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the kernel or by users (see the attr(5) manual page, or visit
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<http://acl.bestbits.at/> for details).
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If unsure, say N.
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config EROFS_FS_POSIX_ACL
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bool "EROFS Access Control Lists"
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depends on EROFS_FS_XATTR
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select FS_POSIX_ACL
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default y
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help
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Posix Access Control Lists (ACLs) support permissions for users and
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groups beyond the owner/group/world scheme.
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To learn more about Access Control Lists, visit the POSIX ACLs for
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Linux website <http://acl.bestbits.at/>.
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If you don't know what Access Control Lists are, say N.
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config EROFS_FS_SECURITY
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bool "EROFS Security Labels"
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depends on EROFS_FS_XATTR
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default y
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help
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Security labels provide an access control facility to support Linux
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Security Models (LSMs) accepted by AppArmor, SELinux, Smack and TOMOYO
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Linux. This option enables an extended attribute handler for file
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security labels in the erofs filesystem, so that it requires enabling
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the extended attribute support in advance.
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If you are not using a security module, say N.
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config EROFS_FS_BACKED_BY_FILE
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bool "File-backed EROFS filesystem support"
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depends on EROFS_FS
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default y
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help
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This allows EROFS to use filesystem image files directly, without
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the intercession of loopback block devices or likewise. It is
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particularly useful for container images with numerous blobs and
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other sandboxes, where loop devices behave intricately. It can also
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be used to simplify error-prone lifetime management of unnecessary
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virtual block devices.
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Note that this feature, along with ongoing fanotify pre-content
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hooks, will eventually replace "EROFS over fscache."
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If you don't want to enable this feature, say N.
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config EROFS_FS_ZIP
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bool "EROFS Data Compression Support"
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depends on EROFS_FS
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default y
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help
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Enable transparent compression support for EROFS file systems.
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If you don't want to enable compression feature, say N.
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config EROFS_FS_ZIP_LZMA
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bool "EROFS LZMA compressed data support"
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depends on EROFS_FS_ZIP
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help
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Saying Y here includes support for reading EROFS file systems
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containing LZMA compressed data, specifically called microLZMA. It
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gives better compression ratios than the default LZ4 format, at the
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expense of more CPU overhead.
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If unsure, say N.
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config EROFS_FS_ZIP_DEFLATE
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bool "EROFS DEFLATE compressed data support"
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depends on EROFS_FS_ZIP
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help
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Saying Y here includes support for reading EROFS file systems
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containing DEFLATE compressed data. It gives better compression
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ratios than the default LZ4 format, while it costs more CPU
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overhead.
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DEFLATE support is an experimental feature for now and so most
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file systems will be readable without selecting this option.
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If unsure, say N.
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config EROFS_FS_ZIP_ZSTD
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bool "EROFS Zstandard compressed data support"
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depends on EROFS_FS_ZIP
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help
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Saying Y here includes support for reading EROFS file systems
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containing Zstandard compressed data. It gives better compression
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ratios than the default LZ4 format, while it costs more CPU
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overhead.
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Zstandard support is an experimental feature for now and so most
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file systems will be readable without selecting this option.
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If unsure, say N.
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config EROFS_FS_ZIP_ACCEL
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bool "EROFS hardware decompression support"
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depends on EROFS_FS_ZIP
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help
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Saying Y here includes hardware accelerator support for reading
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EROFS file systems containing compressed data. It gives better
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decompression speed than the software-implemented decompression, and
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it costs lower CPU overhead.
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Hardware accelerator support is an experimental feature for now and
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file systems are still readable without selecting this option.
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If unsure, say N.
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config EROFS_FS_ONDEMAND
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bool "EROFS fscache-based on-demand read support (deprecated)"
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depends on EROFS_FS
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select FSCACHE
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select CACHEFILES_ONDEMAND
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help
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This permits EROFS to use fscache-backed data blobs with on-demand
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read support.
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It is now deprecated and scheduled to be removed from the kernel
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after fanotify pre-content hooks are landed.
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If unsure, say N.
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config EROFS_FS_PCPU_KTHREAD
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bool "EROFS per-cpu decompression kthread workers"
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depends on EROFS_FS_ZIP
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help
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Saying Y here enables per-CPU kthread workers pool to carry out
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async decompression for low latencies on some architectures.
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If unsure, say N.
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config EROFS_FS_PCPU_KTHREAD_HIPRI
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bool "EROFS high priority per-CPU kthread workers"
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depends on EROFS_FS_ZIP && EROFS_FS_PCPU_KTHREAD
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default y
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help
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This permits EROFS to configure per-CPU kthread workers to run
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at higher priority.
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If unsure, say N.
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