[Buildroot] [PATCH] squashfs: Add lz4 hc compression

[Peter Korsgaard]

>>>>> "Matthias" == Matthias Weisser <m.weisser.m at gmail.com> writes:

Hi,

Sorry for the slow response.

 > lz4 offers a high compression mode. A minimalistic file system shrinks by about 15%.
 > Signed-off-by: Matthias Weisser <m.weisser.m at gmail.com>
 > ---
 >  fs/squashfs/Config.in   | 3 +++
 >  fs/squashfs/squashfs.mk | 4 ++++
 >  2 files changed, 7 insertions(+)

 > diff --git a/fs/squashfs/Config.in b/fs/squashfs/Config.in
 > index ca9ddb2..94e126e 100644
 > --- a/fs/squashfs/Config.in
 > +++ b/fs/squashfs/Config.in
 > @@ -18,6 +18,9 @@ config BR2_TARGET_ROOTFS_SQUASHFS4_GZIP
 >  config BR2_TARGET_ROOTFS_SQUASHFS4_LZ4
 >  	bool "lz4"
 
 > +config BR2_TARGET_ROOTFS_SQUASHFS4_LZ4_HC
 > +	bool "lz4hc"

Is there ever any use case for enabling lz4 WITHOUT the high compression
option? The only drawback is somewhat slower filesystem creation, right?
Perhaps we can just adjust the existing lz4 option to use -Xhc?



> +
 >  config BR2_TARGET_ROOTFS_SQUASHFS4_LZMA
 >  	bool "lzma"
 
 > diff --git a/fs/squashfs/squashfs.mk b/fs/squashfs/squashfs.mk
 > index 446906f..528e0f7 100644
 > --- a/fs/squashfs/squashfs.mk
 > +++ b/fs/squashfs/squashfs.mk
 > @@ -9,6 +9,9 @@ ROOTFS_SQUASHFS_DEPENDENCIES = host-squashfs
 >  ifeq ($(BR2_TARGET_ROOTFS_SQUASHFS4_LZ4),y)
 >  ROOTFS_SQUASHFS_ARGS += -comp lz4
 >  else
 > +ifeq ($(BR2_TARGET_ROOTFS_SQUASHFS4_LZ4_HC),y)
 > +ROOTFS_SQUASHFS_ARGS += -comp lz4 -Xhc
 > +else
 >  ifeq ($(BR2_TARGET_ROOTFS_SQUASHFS4_LZO),y)
 >  ROOTFS_SQUASHFS_ARGS += -comp lzo
 >  else
 > @@ -23,6 +26,7 @@ endif
 >  endif
 >  endif
 >  endif
 > +endif
 
 >  define ROOTFS_SQUASHFS_CMD
 >  	$(HOST_DIR)/usr/bin/mksquashfs $(TARGET_DIR) $@ -noappend \
 > -- 
 > 2.1.4

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-- 
Bye, Peter Korsgaard