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fs/erofs: add config options for dedupe, fragments and ztailpacking

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Add Kconfig toggles for a few more extended options that are useful for
reducing size and improving performance of EROFS images. Descriptions of the
config options were taken from the erofs-utils manpage.

Signed-off-by: Jan Čermák <sairon@sairon.cz>
[Arnout: fix Config.in help text and indentation]
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>
This commit is contained in:
Jan Čermák
2025-02-14 12:21:38 +01:00
committed by Arnout Vandecappelle
parent 01b45ef87d
commit 39aec97630
2 changed files with 43 additions and 0 deletions
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27
fs/erofs/Config.in
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@@ -58,6 +58,33 @@ config BR2_TARGET_ROOTFS_EROFS_LZMA_LEVEL
endif # BR2_TARGET_ROOTFS_EROFS_LZMA
config BR2_TARGET_ROOTFS_EROFS_DEDUPE
bool "enable data deduplication"
depends on !BR2_TARGET_ROOTFS_EROFS_NONE
help
Enable global compressed data deduplication to reduce FS image
size. Introduced in Linux 6.1.
config BR2_TARGET_ROOTFS_EROFS_FRAGMENTS
bool "enable fragments packing"
help
Pack the tail part (pcluster) of compressed files, or entire
files, into a special inode for smaller image size.
Introduced in Linux 6.1.
config BR2_TARGET_ROOTFS_EROFS_ALL_FRAGMENTS
bool "enable fragments packing"
help
Forcely record the whole files into a special inode for better
compression. Introduced in Linux 6.1.
config BR2_TARGET_ROOTFS_EROFS_ZTAILPACKING
bool "enable ztailpacking"
help
Pack the tail part (pcluster) of compressed files into its
metadata to save more space and the tail part I/O. Introduced
in Linux 5.17.
config BR2_TARGET_ROOTFS_EROFS_PCLUSTERSIZE
int "pcluster size"
default 0

16
fs/erofs/erofs.mk
View File

@@ -22,6 +22,22 @@ ifneq ($(BR2_TARGET_ROOTFS_EROFS_PCLUSTERSIZE),0)
ROOTFS_EROFS_ARGS += -C$(strip $(BR2_TARGET_ROOTFS_EROFS_PCLUSTERSIZE))
endif
ifeq ($(BR2_TARGET_ROOTFS_EROFS_DEDUPE),y)
ROOTFS_EROFS_ARGS += -Ededupe
endif
ifeq ($(BR2_TARGET_ROOTFS_EROFS_FRAGMENTS),y)
ROOTFS_EROFS_ARGS += -Efragments
endif
ifeq ($(BR2_TARGET_ROOTFS_EROFS_ALL_FRAGMENTS),y)
ROOTFS_EROFS_ARGS += -Eall-fragments
endif
ifeq ($(BR2_TARGET_ROOTFS_EROFS_ZTAILPACKING),y)
ROOTFS_EROFS_ARGS += -Eztailpacking
endif
define ROOTFS_EROFS_CMD
$(HOST_DIR)/bin/mkfs.erofs $(ROOTFS_EROFS_ARGS) $@ $(TARGET_DIR)
endef