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fs/squashfs: Add block size option 

One advantage of squashfs over similar technologies is the support for
bigger block sizes. However the default size is not a lot bigger
(typically 128k if no `-b` flag specified).

This patch adds the ability to select from common block sizes
which for example can aid in improving compression ratio.

Signed-off-by: Linus Kaschulla <linus@cosmos-ink.net>
[yann.morin.1998@free.fr:
  - drop spurious boolean-based setting in .mk
  - split into multi-line
  - qstrip variable expansion
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
2022.05.x
Linus Kaschulla 2022-05-17 03:24:58 +00:00 committed by Yann E. MORIN
parent 1386336fc8
commit 555f8dfd6e
2 changed files with 54 additions and 1 deletions
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50
fs/squashfs/Config.in
View File

@ -5,6 +5,56 @@ config BR2_TARGET_ROOTFS_SQUASHFS
if BR2_TARGET_ROOTFS_SQUASHFS
choice
prompt "block size"
default BR2_TARGET_ROOTFS_SQUASHFS_BS_128K
help
Data block size. Bigger values can improve
compression ratio.
If unsure, leave at 128k (default).
config BR2_TARGET_ROOTFS_SQUASHFS_BS_4K
bool "4k"
config BR2_TARGET_ROOTFS_SQUASHFS_BS_8K
bool "8k"
config BR2_TARGET_ROOTFS_SQUASHFS_BS_16K
bool "16k"
config BR2_TARGET_ROOTFS_SQUASHFS_BS_32K
bool "32k"
config BR2_TARGET_ROOTFS_SQUASHFS_BS_64K
bool "64k"
config BR2_TARGET_ROOTFS_SQUASHFS_BS_128K
bool "128k"
config BR2_TARGET_ROOTFS_SQUASHFS_BS_256K
bool "256k"
config BR2_TARGET_ROOTFS_SQUASHFS_BS_512K
bool "512k"
config BR2_TARGET_ROOTFS_SQUASHFS_BS_1024K
bool "1024k"
endchoice
config BR2_TARGET_ROOTFS_SQUASHFS_BS
string
default "4K" if BR2_TARGET_ROOTFS_SQUASHFS_BS_4K
default "8K" if BR2_TARGET_ROOTFS_SQUASHFS_BS_84K
default "16K" if BR2_TARGET_ROOTFS_SQUASHFS_BS_16K
default "32K" if BR2_TARGET_ROOTFS_SQUASHFS_BS_32K
default "64K" if BR2_TARGET_ROOTFS_SQUASHFS_BS_64K
default "128K" if BR2_TARGET_ROOTFS_SQUASHFS_BS_128K
default "256K" if BR2_TARGET_ROOTFS_SQUASHFS_BS_256K
default "512K" if BR2_TARGET_ROOTFS_SQUASHFS_BS_512K
default "1024K" if BR2_TARGET_ROOTFS_SQUASHFS_BS_1024K
config BR2_TARGET_ROOTFS_SQUASHFS_PAD
bool "pad to a 4K boundary"
default y # legacy was always ON

5
fs/squashfs/squashfs.mk
View File

@ -6,7 +6,10 @@
ROOTFS_SQUASHFS_DEPENDENCIES = host-squashfs
ROOTFS_SQUASHFS_ARGS = -noappend -processors $(PARALLEL_JOBS)
ROOTFS_SQUASHFS_ARGS = \
-noappend \
-processors $(PARALLEL_JOBS) \
-b $(call qstrip,$(BR2_TARGET_ROOTFS_SQUASHFS_BS))
ifeq ($(BR2_TARGET_ROOTFS_SQUASHFS_PAD),)
ROOTFS_SQUASHFS_ARGS += -nopad