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md/raid6: move raid6 data processing to raid6_pq.ko

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Move the raid6 data processing routines into a standalone module
(raid6_pq) to prepare them to be called from async_tx wrappers and other
non-md drivers/modules.  This precludes a circular dependency of raid456
needing the async modules for data processing while those modules in
turn depend on raid456 for the base level synchronous raid6 routines.

To support this move:
1/ The exportable definitions in raid6.h move to include/linux/raid/pq.h
2/ The raid6_call, recovery calls, and table symbols are exported
3/ Extra #ifdef __KERNEL__ statements to enable the userspace raid6test to
   compile

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Dan Williams
2009-03-31 15:09:39 +11:00
committed by NeilBrown
parent 18b0033491
commit f701d589aa
15 changed files with 66 additions and 34 deletions
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14
drivers/md/mktables.c
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@@ -59,7 +59,7 @@ int main(int argc, char *argv[])
uint8_t v;
uint8_t exptbl[256], invtbl[256];
printf("#include \"raid6.h\"\n");
printf("#include <linux/raid/pq.h>\n");
/* Compute multiplication table */
printf("\nconst u8 __attribute__((aligned(256)))\n"
@@ -76,6 +76,9 @@ int main(int argc, char *argv[])
printf("\t},\n");
}
printf("};\n");
printf("#ifdef __KERNEL__\n");
printf("EXPORT_SYMBOL(raid6_gfmul);\n");
printf("#endif\n");
/* Compute power-of-2 table (exponent) */
v = 1;
@@ -92,6 +95,9 @@ int main(int argc, char *argv[])
}
}
printf("};\n");
printf("#ifdef __KERNEL__\n");
printf("EXPORT_SYMBOL(raid6_gfexp);\n");
printf("#endif\n");
/* Compute inverse table x^-1 == x^254 */
printf("\nconst u8 __attribute__((aligned(256)))\n"
@@ -104,6 +110,9 @@ int main(int argc, char *argv[])
}
}
printf("};\n");
printf("#ifdef __KERNEL__\n");
printf("EXPORT_SYMBOL(raid6_gfinv);\n");
printf("#endif\n");
/* Compute inv(2^x + 1) (exponent-xor-inverse) table */
printf("\nconst u8 __attribute__((aligned(256)))\n"
@@ -115,6 +124,9 @@ int main(int argc, char *argv[])
(j == 7) ? '\n' : ' ');
}
printf("};\n");
printf("#ifdef __KERNEL__\n");
printf("EXPORT_SYMBOL(raid6_gfexi);\n");
printf("#endif\n");
return 0;
}