btrfs-progs: raid56: Introduce tables for RAID6 recovery
Use kernel RAID6 galois tables for later RAID6 recovery. Galois tables file, kernel-lib/tables.c is generated by user space program, mktable. Galois field tables declaration, in kernel-lib/raid56.h, is completely copied from kernel. The mktables.c is copied from kernel with minor header/macro modification, to ensure the generated tables.c works well in btrfs-progs. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo
David Sterba
parent
5e2a2acc9a
commit
084d152407
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@ -35,6 +35,8 @@ btrfs-select-super
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btrfs-calc-size
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btrfs-crc
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btrfstune
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mktables
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kernel-lib/tables.c
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libbtrfs.a
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libbtrfs.so
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libbtrfs.so.0
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13
Makefile
13
Makefile
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@ -95,7 +95,7 @@ objects = ctree.o disk-io.o kernel-lib/radix-tree.o extent-tree.o print-tree.o \
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qgroup.o raid56.o free-space-cache.o kernel-lib/list_sort.o props.o \
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kernel-shared/ulist.o qgroup-verify.o backref.o string-table.o task-utils.o \
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inode.o file.o find-root.o free-space-tree.o help.o send-dump.o \
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fsfeatures.o
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fsfeatures.o kernel-lib/tables.o
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cmds_objects = cmds-subvolume.o cmds-filesystem.o cmds-device.o cmds-scrub.o \
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cmds-inspect.o cmds-balance.o cmds-send.o cmds-receive.o \
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cmds-quota.o cmds-qgroup.o cmds-replace.o cmds-check.o \
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@ -314,6 +314,14 @@ version.h: version.sh version.h.in configure.ac
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@echo " [SH] $@"
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$(Q)bash ./config.status --silent $@
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mktables: kernel-lib/mktables.c
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@echo " [CC] $@"
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$(Q)$(CC) $(CFLAGS) $< -o $@
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kernel-lib/tables.c: mktables
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@echo " [TABLE] $@"
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$(Q)./mktables > $@ || ($(RM) -f $@ && exit 1)
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libbtrfs: $(libs_shared) $(lib_links)
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$(libs_shared): $(libbtrfs_objects) $(lib_links) send.h
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@ -503,11 +511,12 @@ clean: $(CLEANDIRS)
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$(Q)$(RM) -f -- $(progs) *.o *.o.d \
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kernel-lib/*.o kernel-lib/*.o.d \
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kernel-shared/*.o kernel-shared/*.o.d \
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kernel-lib/tables.c \
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image/*.o image/*.o.d \
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convert/*.o convert/*.o.d \
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mkfs/*.o mkfs/*.o.d \
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dir-test ioctl-test quick-test library-test library-test-static \
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btrfs.static mkfs.btrfs.static fssum \
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mktables btrfs.static mkfs.btrfs.static fssum \
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$(check_defs) \
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$(libs) $(lib_links) \
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$(progs_static) $(progs_extra)
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@ -0,0 +1,148 @@
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/* -*- linux-c -*- ------------------------------------------------------- *
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*
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* Copyright 2002-2007 H. Peter Anvin - All Rights Reserved
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*
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* This file is part of the Linux kernel, and is made available under
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* the terms of the GNU General Public License version 2 or (at your
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* option) any later version; incorporated herein by reference.
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*
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* ----------------------------------------------------------------------- */
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/*
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* mktables.c
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*
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* Make RAID-6 tables. This is a host user space program to be run at
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* compile time.
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*/
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/*
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* Btrfs-progs port, with following minor fixes:
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* 1) Use "kerncompat.h"
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* 2) Get rid of __KERNEL__ related macros
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*/
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#include <stdio.h>
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#include <string.h>
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#include <inttypes.h>
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#include <stdlib.h>
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#include <time.h>
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static uint8_t gfmul(uint8_t a, uint8_t b)
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{
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uint8_t v = 0;
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while (b) {
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if (b & 1)
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v ^= a;
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a = (a << 1) ^ (a & 0x80 ? 0x1d : 0);
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b >>= 1;
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}
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return v;
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}
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static uint8_t gfpow(uint8_t a, int b)
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{
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uint8_t v = 1;
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b %= 255;
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if (b < 0)
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b += 255;
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while (b) {
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if (b & 1)
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v = gfmul(v, a);
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a = gfmul(a, a);
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b >>= 1;
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}
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return v;
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}
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int main(int argc, char *argv[])
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{
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int i, j, k;
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uint8_t v;
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uint8_t exptbl[256], invtbl[256];
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printf("#include \"kerncompat.h\"\n");
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/* Compute multiplication table */
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printf("\nconst u8 __attribute__((aligned(256)))\n"
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"raid6_gfmul[256][256] =\n"
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"{\n");
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for (i = 0; i < 256; i++) {
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printf("\t{\n");
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for (j = 0; j < 256; j += 8) {
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printf("\t\t");
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for (k = 0; k < 8; k++)
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printf("0x%02x,%c", gfmul(i, j + k),
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(k == 7) ? '\n' : ' ');
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}
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printf("\t},\n");
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}
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printf("};\n");
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/* Compute vector multiplication table */
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printf("\nconst u8 __attribute__((aligned(256)))\n"
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"raid6_vgfmul[256][32] =\n"
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"{\n");
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for (i = 0; i < 256; i++) {
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printf("\t{\n");
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for (j = 0; j < 16; j += 8) {
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printf("\t\t");
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for (k = 0; k < 8; k++)
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printf("0x%02x,%c", gfmul(i, j + k),
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(k == 7) ? '\n' : ' ');
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}
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for (j = 0; j < 16; j += 8) {
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printf("\t\t");
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for (k = 0; k < 8; k++)
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printf("0x%02x,%c", gfmul(i, (j + k) << 4),
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(k == 7) ? '\n' : ' ');
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}
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printf("\t},\n");
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}
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printf("};\n");
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/* Compute power-of-2 table (exponent) */
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v = 1;
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printf("\nconst u8 __attribute__((aligned(256)))\n"
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"raid6_gfexp[256] =\n" "{\n");
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for (i = 0; i < 256; i += 8) {
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printf("\t");
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for (j = 0; j < 8; j++) {
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exptbl[i + j] = v;
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printf("0x%02x,%c", v, (j == 7) ? '\n' : ' ');
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v = gfmul(v, 2);
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if (v == 1)
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v = 0; /* For entry 255, not a real entry */
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}
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}
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printf("};\n");
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/* Compute inverse table x^-1 == x^254 */
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printf("\nconst u8 __attribute__((aligned(256)))\n"
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"raid6_gfinv[256] =\n" "{\n");
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for (i = 0; i < 256; i += 8) {
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printf("\t");
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for (j = 0; j < 8; j++) {
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invtbl[i + j] = v = gfpow(i + j, 254);
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printf("0x%02x,%c", v, (j == 7) ? '\n' : ' ');
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}
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}
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printf("};\n");
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/* Compute inv(2^x + 1) (exponent-xor-inverse) table */
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printf("\nconst u8 __attribute__((aligned(256)))\n"
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"raid6_gfexi[256] =\n" "{\n");
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for (i = 0; i < 256; i += 8) {
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printf("\t");
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for (j = 0; j < 8; j++)
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printf("0x%02x,%c", invtbl[exptbl[i + j] ^ 1],
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(j == 7) ? '\n' : ' ');
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}
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printf("};\n");
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return 0;
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}
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@ -25,4 +25,16 @@
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void raid6_gen_syndrome(int disks, size_t bytes, void **ptrs);
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int raid5_gen_result(int nr_devs, size_t stripe_len, int dest, void **data);
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/*
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* Headers synchronized from kernel include/linux/raid/pq.h
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* No modification at all.
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*
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* Galois field tables.
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*/
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extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256)));
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extern const u8 raid6_vgfmul[256][32] __attribute__((aligned(256)));
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extern const u8 raid6_gfexp[256] __attribute__((aligned(256)));
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extern const u8 raid6_gfinv[256] __attribute__((aligned(256)));
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extern const u8 raid6_gfexi[256] __attribute__((aligned(256)));
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#endif
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