Commit a26ee60f authored by Alain Knaff's avatar Alain Knaff Committed by H. Peter Anvin
Browse files

bzip2/lzma: fix built-in initramfs vs CONFIG_RD_GZIP 



Impact: Resolves build failures in some configurations

Makes it possible to disable CONFIG_RD_GZIP . In that case, the
built-in initramfs will be compressed by whatever compressor is
available (bzip2 or lzma) or left uncompressed if none is available.

It also removes a couple of warnings which occur when no ramdisk
compression at all is chosen.

It also restores the select ZLIB_INFLATE in drivers/block/Kconfig
which somehow came missing. This is needed to activate compilation of
the stuff in zlib_deflate.

Signed-off-by: default avatarAlain Knaff <alain@knaff.lu>
Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
parent fb9a4ca9

init/initramfs.c

+6 −1
Original line number Diff line number Diff line
@@ -389,7 +389,7 @@ static int __init write_buffer(char *buf, unsigned len) 
	return len - count;

}





#if defined CONFIG_RD_GZIP || defined CONFIG_RD_BZIP2 || defined CONFIG_RD_LZMA

static int __init flush_buffer(void *bufv, unsigned len)

{

	char *buf = (char *) bufv;
@@ -412,6 +412,7 @@ static int __init flush_buffer(void *bufv, unsigned len) 
	}

	return origLen;

}

#endif



static unsigned my_inptr;   /* index of next byte to be processed in inbuf */
@@ -449,10 +450,12 @@ static char * __init unpack_to_rootfs(char *buf, unsigned len, int check_only) 
			continue;

		}

		this_header = 0;

#ifdef CONFIG_RD_GZIP

		if (!gunzip(buf, len, NULL, flush_buffer, NULL,

			    &my_inptr, error) &&

		    message == NULL)

			goto ok;

#endif



#ifdef CONFIG_RD_BZIP2

		message = NULL; /* Zero out message, or else cpio will
@@ -473,7 +476,9 @@ static char * __init unpack_to_rootfs(char *buf, unsigned len, int check_only) 
			goto ok;

		}

#endif

#if defined CONFIG_RD_GZIP || defined CONFIG_RD_BZIP2 || defined CONFIG_RD_LZMA

ok:

#endif

		if (state != Reset)

			error("junk in compressed archive");

		this_header = saved_offset + my_inptr;

scripts/gen_initramfs_list.sh

+11 −6
Original line number Diff line number Diff line
@@ -5,7 +5,7 @@ 
# Released under the terms of the GNU GPL

#

# Generate a cpio packed initramfs. It uses gen_init_cpio to generate

# the cpio archive, and gzip to pack it.

# the cpio archive, and then compresses it.

# The script may also be used to generate the inputfile used for gen_init_cpio

# This script assumes that gen_init_cpio is located in usr/ directory
@@ -16,8 +16,8 @@ usage() { 
cat << EOF

Usage:

$0 [-o <file>] [-u <uid>] [-g <gid>] {-d | <cpio_source>} ...

	-o <file>      Create gzipped initramfs file named <file> using

		       gen_init_cpio and gzip

	-o <file>      Create compressed initramfs file named <file> using

		       gen_init_cpio and compressor depending on the extension

	-u <uid>       User ID to map to user ID 0 (root).

		       <uid> is only meaningful if <cpio_source> is a

		       directory.  "squash" forces all files to uid 0.
@@ -225,6 +225,7 @@ cpio_list= 
output="/dev/stdout"

output_file=""

is_cpio_compressed=

compr="gzip -9 -f"



arg="$1"

case "$arg" in
@@ -233,11 +234,15 @@ case "$arg" in 
		echo "deps_initramfs := \\"

		shift

		;;

	"-o")	# generate gzipped cpio image named $1

	"-o")	# generate compressed cpio image named $1

		shift

		output_file="$1"

		cpio_list="$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX)"

		output=${cpio_list}

		echo "$output_file" | grep -q "\.gz$" && compr="gzip -9 -f"

		echo "$output_file" | grep -q "\.bz2$" && compr="bzip2 -9 -f"

		echo "$output_file" | grep -q "\.lzma$" && compr="lzma -9 -f"

		echo "$output_file" | grep -q "\.cpio$" && compr="cat"

		shift

		;;

esac
@@ -274,7 +279,7 @@ while [ $# -gt 0 ]; do 
	esac

done



# If output_file is set we will generate cpio archive and gzip it

# If output_file is set we will generate cpio archive and compress it

# we are carefull to delete tmp files

if [ ! -z ${output_file} ]; then

	if [ -z ${cpio_file} ]; then
@@ -287,7 +292,7 @@ if [ ! -z ${output_file} ]; then 
	if [ "${is_cpio_compressed}" = "compressed" ]; then

		cat ${cpio_tfile} > ${output_file}

	else

		cat ${cpio_tfile} | gzip -f -9 - > ${output_file}

		cat ${cpio_tfile} | ${compr}  - > ${output_file}

	fi

	[ -z ${cpio_file} ] && rm ${cpio_tfile}

fi

usr/Makefile

+30 −12
Original line number Diff line number Diff line
@@ -5,14 +5,32 @@ 
klibcdirs:;

PHONY += klibcdirs



# Find out "preferred" ramdisk compressor. Order of preference is

#  1. bzip2 efficient, and likely to be present

#  2. gzip former default

#  3. lzma

#  4. none



# None of the above

suffix_y                   =



# Lzma, but no gzip nor bzip2

suffix_$(CONFIG_RD_LZMA)   = .lzma



# Gzip, but no bzip2

suffix_$(CONFIG_RD_GZIP)   = .gz



# Bzip2

suffix_$(CONFIG_RD_BZIP2)  = .bz2





# Generate builtin.o based on initramfs_data.o

obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o

obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data$(suffix_y).o



# initramfs_data.o contains the initramfs_data.cpio.gz image.

# initramfs_data.o contains the compressed initramfs_data.cpio image.

# The image is included using .incbin, a dependency which is not

# tracked automatically.

$(obj)/initramfs_data.o: $(obj)/initramfs_data.cpio.gz FORCE

$(obj)/initramfs_data$(suffix_y).o: $(obj)/initramfs_data.cpio$(suffix_y) FORCE



#####

# Generate the initramfs cpio archive
@@ -25,28 +43,28 @@ ramfs-args := \ 
        $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \

        $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))



# .initramfs_data.cpio.gz.d is used to identify all files included

# .initramfs_data.cpio.d is used to identify all files included

# in initramfs and to detect if any files are added/removed.

# Removed files are identified by directory timestamp being updated

# The dependency list is generated by gen_initramfs.sh -l

ifneq ($(wildcard $(obj)/.initramfs_data.cpio.gz.d),)

	include $(obj)/.initramfs_data.cpio.gz.d

ifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),)

	include $(obj)/.initramfs_data.cpio.d

endif



quiet_cmd_initfs = GEN     $@

      cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)



targets := initramfs_data.cpio.gz

targets := initramfs_data.cpio.gz initramfs_data.cpio.bz2 initramfs_data.cpio.lzma initramfs_data.cpio

# do not try to update files included in initramfs

$(deps_initramfs): ;



$(deps_initramfs): klibcdirs

# We rebuild initramfs_data.cpio.gz if:

# 1) Any included file is newer then initramfs_data.cpio.gz

# We rebuild initramfs_data.cpio if:

# 1) Any included file is newer then initramfs_data.cpio

# 2) There are changes in which files are included (added or deleted)

# 3) If gen_init_cpio are newer than initramfs_data.cpio.gz

# 3) If gen_init_cpio are newer than initramfs_data.cpio

# 4) arguments to gen_initramfs.sh changes

$(obj)/initramfs_data.cpio.gz: $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs

	$(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.gz.d

$(obj)/initramfs_data.cpio$(suffix_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs

	$(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.d

	$(call if_changed,initfs)

usr/initramfs_data.S

+1 −1
Original line number Diff line number Diff line
@@ -26,5 +26,5 @@ SECTIONS 
*/



.section .init.ramfs,"a"

.incbin "usr/initramfs_data.cpio.gz"

.incbin "usr/initramfs_data.cpio"

usr/initramfs_data.bz2.S

0 → 100644
+29 −0
Original line number Diff line number Diff line 
/*

  initramfs_data includes the compressed binary that is the

  filesystem used for early user space.

  Note: Older versions of "as" (prior to binutils 2.11.90.0.23

  released on 2001-07-14) dit not support .incbin.

  If you are forced to use older binutils than that then the

  following trick can be applied to create the resulting binary:





  ld -m elf_i386  --format binary --oformat elf32-i386 -r \

  -T initramfs_data.scr initramfs_data.cpio.gz -o initramfs_data.o

   ld -m elf_i386  -r -o built-in.o initramfs_data.o



  initramfs_data.scr looks like this:

SECTIONS

{

       .init.ramfs : { *(.data) }

}



  The above example is for i386 - the parameters vary from architectures.

  Eventually look up LDFLAGS_BLOB in an older version of the

  arch/$(ARCH)/Makefile to see the flags used before .incbin was introduced.



  Using .incbin has the advantage over ld that the correct flags are set

  in the ELF header, as required by certain architectures.

*/



.section .init.ramfs,"a"

.incbin "usr/initramfs_data.cpio.bz2"

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