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btrfs-progs: build: add option to disable LZO support for restore

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LZO as a compression format is pretty archaic these days, there are
better algorithms in all metrics for compression and decompression, and
lzo hasn't had a new release since 2017.

Add an option to disable LZO (defaulting to enabled), and respect it in
cmds/restore.c.

NOTE: disabling support for LZO will make make it impossible to restore
data from filesystems where the compression has ever been used. It's not
recommended to build without the support in general.

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Ross Burton 2022-05-24 13:44:29 +01:00 committed by David Sterba
parent a60afdceb9
commit 73545c1fe6
4 changed files with 29 additions and 11 deletions
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2
Makefile
View File

@ -335,7 +335,7 @@ endif
btrfs_convert_cflags = -DBTRFSCONVERT_EXT2=$(BTRFSCONVERT_EXT2)
btrfs_convert_cflags += -DBTRFSCONVERT_REISERFS=$(BTRFSCONVERT_REISERFS)
btrfs_fragments_libs = -lgd -lpng -ljpeg -lfreetype
cmds_restore_cflags = -DBTRFSRESTORE_ZSTD=$(BTRFSRESTORE_ZSTD)
cmds_restore_cflags = -DBTRFSRESTORE_LZO=$(BTRFSRESTORE_LZO) -DBTRFSRESTORE_ZSTD=$(BTRFSRESTORE_ZSTD)
ifeq ($(CRYPTOPROVIDER_BUILTIN),1)
CRYPTO_OBJECTS = crypto/sha224-256.o crypto/blake2b-ref.o

1
Makefile.inc.in
View File

@ -16,6 +16,7 @@ BUILD_PROGRAMS = @BUILD_PROGRAMS@
BUILD_SHARED_LIBRARIES = @BUILD_SHARED_LIBRARIES@
BUILD_STATIC_LIBRARIES = @BUILD_STATIC_LIBRARIES@
BTRFSCONVERT_EXT2 = @BTRFSCONVERT_EXT2@
BTRFSRESTORE_LZO = @BTRFSRESTORE_LZO@
BTRFSCONVERT_REISERFS = @BTRFSCONVERT_REISERFS@
BTRFSRESTORE_ZSTD = @BTRFSRESTORE_ZSTD@
PYTHON_BINDINGS = @PYTHON_BINDINGS@

7
cmds/restore.c
View File

@ -25,8 +25,10 @@
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#if BTRFSRESTORE_LZO
#include <lzo/lzoconf.h>
#include <lzo/lzo1x.h>
#endif
#include <zlib.h>
#if BTRFSRESTORE_ZSTD
#include <zstd.h>
@ -98,6 +100,10 @@ static inline size_t read_compress_length(unsigned char *buf)
static int decompress_lzo(struct btrfs_root *root, unsigned char *inbuf,
char *outbuf, u64 compress_len, u64 *decompress_len)
{
#if !BTRFSRESTORE_LZO
error("btrfs-restore not compiled with lzo support");
return -1;
#else
size_t new_len;
size_t in_len;
size_t out_len = 0;
@ -156,6 +162,7 @@ static int decompress_lzo(struct btrfs_root *root, unsigned char *inbuf,
*decompress_len = out_len;
return 0;
#endif
}
static int decompress_zstd(const char *inbuf, char *outbuf, u64 compress_len,

30
configure.ac
View File

@ -372,16 +372,26 @@ if ${PKG_CONFIG} udev --atleast-version 190; then
fi
AC_SUBST(UDEVDIR)
dnl lzo library does not provide pkg-config, let use classic way
AC_CHECK_LIB([lzo2], [lzo_version], [
LZO2_LIBS="-llzo2"
LZO2_CFLAGS=""
LZO2_LIBS_STATIC="-llzo2"],[
AC_MSG_ERROR([cannot find lzo2 library])
])
AC_SUBST([LZO2_LIBS])
AC_SUBST([LZO2_LIBS_STATIC])
AC_SUBST([LZO2_CFLAGS])
AC_ARG_ENABLE([lzo],
AS_HELP_STRING([--disable-lzo], [build without lzo support (default: enabled)]),
[], [enable_lzo=yes]
)
if test "x$enable_lzo" = xyes; then
dnl lzo library does not provide pkg-config, use classic way
AC_CHECK_LIB([lzo2], [lzo_version], [
LZO2_LIBS="-llzo2"
LZO2_CFLAGS=""
LZO2_LIBS_STATIC="-llzo2"],[
AC_MSG_ERROR([cannot find lzo2 library])
])
AC_SUBST([LZO2_LIBS])
AC_SUBST([LZO2_LIBS_STATIC])
AC_SUBST([LZO2_CFLAGS])
fi
AS_IF([test "x$enable_lzo" = xyes], [BTRFSRESTORE_LZO=1], [BTRFSRESTORE_LZO=0])
AC_SUBST(BTRFSRESTORE_LZO)
dnl call PKG_INSTALLDIR from pkg.m4 to set pkgconfigdir
m4_ifdef([PKG_INSTALLDIR], [PKG_INSTALLDIR], [AC_MSG_ERROR([please install pkgconf])])