freebsd-nq/sys/cddl/boot/zfs/zfssubr.c
Doug Rabson 0d16312b46 Some zfsboot fixes from Norikatsu Shigemura:
1. zfsboot2 (boot2) doesn't %d (printf), so change %d to %u.
2. chase new zpool versioning as SPA_VERSION.
   Obtained from: sys/cddl/contrib/opensolaris/uts/common/sys/fs/zfs.h

Submitted by:	nork
2008-11-19 16:59:19 +00:00

194 lines
5.4 KiB
C

/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
static uint64_t zfs_crc64_table[256];
static void
zfs_init_crc(void)
{
int i, j;
uint64_t *ct;
/*
* Calculate the crc64 table (used for the zap hash
* function).
*/
if (zfs_crc64_table[128] != ZFS_CRC64_POLY) {
memset(zfs_crc64_table, 0, sizeof(zfs_crc64_table));
for (i = 0; i < 256; i++)
for (ct = zfs_crc64_table + i, *ct = i, j = 8; j > 0; j--)
*ct = (*ct >> 1) ^ (-(*ct & 1) & ZFS_CRC64_POLY);
}
}
static void
zio_checksum_off(const void *buf, uint64_t size, zio_cksum_t *zcp)
{
ZIO_SET_CHECKSUM(zcp, 0, 0, 0, 0);
}
/*
* Signature for checksum functions.
*/
typedef void zio_checksum_t(const void *data, uint64_t size, zio_cksum_t *zcp);
/*
* Information about each checksum function.
*/
typedef struct zio_checksum_info {
zio_checksum_t *ci_func[2]; /* checksum function for each byteorder */
int ci_correctable; /* number of correctable bits */
int ci_zbt; /* uses zio block tail? */
const char *ci_name; /* descriptive name */
} zio_checksum_info_t;
#include "fletcher.c"
#include "sha256.c"
static zio_checksum_info_t zio_checksum_table[ZIO_CHECKSUM_FUNCTIONS] = {
{{NULL, NULL}, 0, 0, "inherit"},
{{NULL, NULL}, 0, 0, "on"},
{{zio_checksum_off, zio_checksum_off}, 0, 0, "off"},
{{zio_checksum_SHA256, NULL}, 1, 1, "label"},
{{zio_checksum_SHA256, NULL}, 1, 1, "gang_header"},
{{fletcher_2_native, NULL}, 0, 1, "zilog"},
{{fletcher_2_native, NULL}, 0, 0, "fletcher2"},
{{fletcher_4_native, NULL}, 1, 0, "fletcher4"},
{{zio_checksum_SHA256, NULL}, 1, 0, "SHA256"},
};
/*
* Common signature for all zio compress/decompress functions.
*/
typedef size_t zio_compress_func_t(void *src, void *dst,
size_t s_len, size_t d_len, int);
typedef int zio_decompress_func_t(void *src, void *dst,
size_t s_len, size_t d_len, int);
/*
* Information about each compression function.
*/
typedef struct zio_compress_info {
zio_compress_func_t *ci_compress; /* compression function */
zio_decompress_func_t *ci_decompress; /* decompression function */
int ci_level; /* level parameter */
const char *ci_name; /* algorithm name */
} zio_compress_info_t;
#include "lzjb.c"
/*
* Compression vectors.
*/
static zio_compress_info_t zio_compress_table[ZIO_COMPRESS_FUNCTIONS] = {
{NULL, NULL, 0, "inherit"},
{NULL, NULL, 0, "on"},
{NULL, NULL, 0, "uncompressed"},
{NULL, lzjb_decompress, 0, "lzjb"},
{NULL, NULL, 0, "empty"},
{NULL, NULL, 1, "gzip-1"},
{NULL, NULL, 2, "gzip-2"},
{NULL, NULL, 3, "gzip-3"},
{NULL, NULL, 4, "gzip-4"},
{NULL, NULL, 5, "gzip-5"},
{NULL, NULL, 6, "gzip-6"},
{NULL, NULL, 7, "gzip-7"},
{NULL, NULL, 8, "gzip-8"},
{NULL, NULL, 9, "gzip-9"},
};
static int
zio_checksum_error(const blkptr_t *bp, void *data)
{
zio_cksum_t zc = bp->blk_cksum;
unsigned int checksum = BP_GET_CHECKSUM(bp);
uint64_t size = BP_GET_PSIZE(bp);
zio_block_tail_t *zbt = (zio_block_tail_t *)((char *)data + size) - 1;
zio_checksum_info_t *ci = &zio_checksum_table[checksum];
zio_cksum_t actual_cksum, expected_cksum;
if (checksum >= ZIO_CHECKSUM_FUNCTIONS || ci->ci_func[0] == NULL)
return (EINVAL);
if (ci->ci_zbt) {
expected_cksum = zbt->zbt_cksum;
zbt->zbt_cksum = zc;
ci->ci_func[0](data, size, &actual_cksum);
zbt->zbt_cksum = expected_cksum;
zc = expected_cksum;
} else {
/* ASSERT(!BP_IS_GANG(bp)); */
ci->ci_func[0](data, size, &actual_cksum);
}
if (!ZIO_CHECKSUM_EQUAL(actual_cksum, zc)) {
/*printf("ZFS: read checksum failed\n");*/
return (EIO);
}
return (0);
}
static int
zio_decompress_data(int cpfunc, void *src, uint64_t srcsize,
void *dest, uint64_t destsize)
{
zio_compress_info_t *ci = &zio_compress_table[cpfunc];
/* ASSERT((uint_t)cpfunc < ZIO_COMPRESS_FUNCTIONS); */
if (!ci->ci_decompress) {
printf("ZFS: unsupported compression algorithm %u\n", cpfunc);
return (EIO);
}
return (ci->ci_decompress(src, dest, srcsize, destsize, ci->ci_level));
}
static uint64_t
zap_hash(uint64_t salt, const char *name)
{
const uint8_t *cp;
uint8_t c;
uint64_t crc = salt;
/*ASSERT(crc != 0);*/
/*ASSERT(zfs_crc64_table[128] == ZFS_CRC64_POLY);*/
for (cp = (const uint8_t *)name; (c = *cp) != '\0'; cp++)
crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ c) & 0xFF];
/*
* Only use 28 bits, since we need 4 bits in the cookie for the
* collision differentiator. We MUST use the high bits, since
* those are the onces that we first pay attention to when
* chosing the bucket.
*/
crc &= ~((1ULL << (64 - ZAP_HASHBITS)) - 1);
return (crc);
}