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erofs: update compression algorithm status

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The following changes are proposed in the upcoming Linux 7.0:

 - Enable LZMA support by default, as it's already in use by Fedora 42/43
   and some Android vendors for minimal filesystem sizes;

 - Promote DEFLATE and Zstandard out of EXPERIMENTAL status, given that
   they have been landed and well-tested for over a year and are
   already ready for general use.

Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
This commit is contained in:
Gao Xiang 2026-02-04 17:37:31 +08:00
parent c134a40f86
commit 8f2fb72fd1
3 changed files with 6 additions and 12 deletions
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6
Documentation/filesystems/erofs.rst
View file

@ -63,9 +63,9 @@ Here are the main features of EROFS:
- Support POSIX.1e ACLs by using extended attributes;
- Support transparent data compression as an option:
LZ4, MicroLZMA and DEFLATE algorithms can be used on a per-file basis; In
addition, inplace decompression is also supported to avoid bounce compressed
buffers and unnecessary page cache thrashing.
LZ4, MicroLZMA, DEFLATE and Zstandard algorithms can be used on a per-file
basis; In addition, inplace decompression is also supported to avoid bounce
compressed buffers and unnecessary page cache thrashing.
- Support chunk-based data deduplication and rolling-hash compressed data
deduplication;

11
fs/erofs/Kconfig
View file

@ -112,13 +112,14 @@ config EROFS_FS_ZIP
config EROFS_FS_ZIP_LZMA
bool "EROFS LZMA compressed data support"
depends on EROFS_FS_ZIP
default y
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 default LZ4 format, at the
expense of more CPU overhead.
If unsure, say N.
Say N if you want to disable LZMA compression support.
config EROFS_FS_ZIP_DEFLATE
bool "EROFS DEFLATE compressed data support"
@ -129,9 +130,6 @@ config EROFS_FS_ZIP_DEFLATE
ratios than the default LZ4 format, while it costs more CPU
overhead.
DEFLATE 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_ZSTD
@ -141,10 +139,7 @@ config EROFS_FS_ZIP_ZSTD
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.
overhead and memory footprint.
If unsure, say N.

1
fs/erofs/decompressor_deflate.c
View file

@ -89,7 +89,6 @@ static int z_erofs_load_deflate_config(struct super_block *sb,
inited = true;
}
mutex_unlock(&deflate_resize_mutex);
erofs_info(sb, "EXPERIMENTAL DEFLATE feature in use. Use at your own risk!");
return 0;
failed:
mutex_unlock(&deflate_resize_mutex);