diff options
Diffstat (limited to 'fs/erofs/Kconfig')
| -rw-r--r-- | fs/erofs/Kconfig | 67 |
1 files changed, 58 insertions, 9 deletions
diff --git a/fs/erofs/Kconfig b/fs/erofs/Kconfig index fffd3919343e..6beeb7063871 100644 --- a/fs/erofs/Kconfig +++ b/fs/erofs/Kconfig @@ -3,8 +3,8 @@ config EROFS_FS tristate "EROFS filesystem support" depends on BLOCK + select CRC32 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 @@ -13,12 +13,12 @@ config EROFS_FS 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. + It also provides transparent compression and deduplication support to + improve storage density and maintain relatively high compression + ratios, and it implements in-place decompression to temporarily reuse + page cache for compressed data using proper strategies, which is + quite useful for ensuring guaranteed end-to-end runtime decompression + performance under extreme memory pressure without extra cost. See the documentation at <file:Documentation/filesystems/erofs.rst> and the web pages at <https://erofs.docs.kernel.org> for more details. @@ -74,13 +74,30 @@ config EROFS_FS_SECURITY If you are not using a security module, say N. +config EROFS_FS_BACKED_BY_FILE + bool "File-backed EROFS filesystem support" + depends on EROFS_FS + default y + help + This allows EROFS to use filesystem image files directly, without + the intercession of loopback block devices or likewise. It is + particularly useful for container images with numerous blobs and + other sandboxes, where loop devices behave intricately. It can also + be used to simplify error-prone lifetime management of unnecessary + virtual block devices. + + Note that this feature, along with ongoing fanotify pre-content + hooks, will eventually replace "EROFS over fscache." + + If you don't want to enable this feature, 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. + Enable transparent compression support for EROFS file systems. If you don't want to enable compression feature, say N. @@ -112,8 +129,37 @@ config EROFS_FS_ZIP_DEFLATE If unsure, say N. +config EROFS_FS_ZIP_ZSTD + bool "EROFS Zstandard compressed data support" + depends on EROFS_FS_ZIP + select ZSTD_DECOMPRESS + help + Saying Y here includes support for reading EROFS file systems + containing Zstandard compressed data. It gives better compression + ratios than the default LZ4 format, while it costs more CPU + overhead. + + Zstandard support is an experimental feature for now and so most + file systems will be readable without selecting this option. + + If unsure, say N. + +config EROFS_FS_ZIP_ACCEL + bool "EROFS hardware decompression support" + depends on EROFS_FS_ZIP + help + Saying Y here includes hardware accelerator support for reading + EROFS file systems containing compressed data. It gives better + decompression speed than the software-implemented decompression, and + it costs lower CPU overhead. + + Hardware accelerator support is an experimental feature for now and + file systems are still readable without selecting this option. + + If unsure, say N. + config EROFS_FS_ONDEMAND - bool "EROFS fscache-based on-demand read support" + bool "EROFS fscache-based on-demand read support (deprecated)" depends on EROFS_FS select NETFS_SUPPORT select FSCACHE @@ -123,6 +169,9 @@ config EROFS_FS_ONDEMAND This permits EROFS to use fscache-backed data blobs with on-demand read support. + It is now deprecated and scheduled to be removed from the kernel + after fanotify pre-content hooks are landed. + If unsure, say N. config EROFS_FS_PCPU_KTHREAD |