Date: Sat, 16 May 2009 10:48:20 +0000 (UTC) From: Doug Rabson <dfr@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r192194 - in head/sys: boot/i386/zfsboot boot/zfs cddl/boot/zfs Message-ID: <200905161048.n4GAmKRh057122@svn.freebsd.org>
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Author: dfr Date: Sat May 16 10:48:20 2009 New Revision: 192194 URL: http://svn.freebsd.org/changeset/base/192194 Log: Add support for booting from raidz1 and raidz2 pools. Modified: head/sys/boot/i386/zfsboot/zfsboot.c head/sys/boot/zfs/zfsimpl.c head/sys/cddl/boot/zfs/README head/sys/cddl/boot/zfs/zfsimpl.h head/sys/cddl/boot/zfs/zfssubr.c Modified: head/sys/boot/i386/zfsboot/zfsboot.c ============================================================================== --- head/sys/boot/i386/zfsboot/zfsboot.c Sat May 16 10:42:00 2009 (r192193) +++ head/sys/boot/i386/zfsboot/zfsboot.c Sat May 16 10:48:20 2009 (r192194) @@ -413,6 +413,20 @@ int13probe(int drive) return(0); } +/* + * We call this when we find a ZFS vdev - ZFS consumes the dsk + * structure so we must make a new one. + */ +static struct dsk * +copy_dsk(struct dsk *dsk) +{ + struct dsk *newdsk; + + newdsk = malloc(sizeof(struct dsk)); + *newdsk = *dsk; + return (newdsk); +} + static void probe_drive(struct dsk *dsk, spa_t **spap) { @@ -426,9 +440,6 @@ probe_drive(struct dsk *dsk, spa_t **spa char *sec; unsigned i; - if (!int13probe(dsk->drive)) - return; - /* * If we find a vdev on the whole disk, stop here. Otherwise dig * out the MBR and probe each slice in turn for a vdev. @@ -473,7 +484,7 @@ probe_drive(struct dsk *dsk, spa_t **spa if (vdev_probe(vdev_read, dsk, spap) == 0) { /* * We record the first pool we find (we will try - * to boot from that one. + * to boot from that one). */ spap = 0; @@ -481,10 +492,7 @@ probe_drive(struct dsk *dsk, spa_t **spa * This slice had a vdev. We need a new dsk * structure now since the vdev now owns this one. */ - struct dsk *newdsk; - newdsk = malloc(sizeof(struct dsk)); - *newdsk = *dsk; - dsk = newdsk; + dsk = copy_dsk(dsk); } break; } @@ -514,10 +522,7 @@ trymbr: * This slice had a vdev. We need a new dsk structure now * since the vdev now owns this one. */ - struct dsk *newdsk; - newdsk = malloc(sizeof(struct dsk)); - *newdsk = *dsk; - dsk = newdsk; + dsk = copy_dsk(dsk); } } } @@ -569,10 +574,13 @@ main(void) * will find any other available pools and it may fill in missing * vdevs for the boot pool. */ - for (i = 0; i < 4; i++) { + for (i = 0; i < 128; i++) { if ((i | DRV_HARD) == *(uint8_t *)PTOV(ARGS)) continue; + if (!int13probe(i | DRV_HARD)) + break; + dsk = malloc(sizeof(struct dsk)); dsk->drive = i | DRV_HARD; dsk->type = dsk->drive & TYPE_AD; @@ -944,7 +952,7 @@ static int drvread(struct dsk *dsk, void *buf, unsigned lba, unsigned nblk) { #ifdef GPT - static unsigned c = 0x2d5c7c2f; + static unsigned c = 0x2d5c7c2f; if (!OPT_CHECK(RBX_QUIET)) printf("%c\b", c = c << 8 | c >> 24); Modified: head/sys/boot/zfs/zfsimpl.c ============================================================================== --- head/sys/boot/zfs/zfsimpl.c Sat May 16 10:42:00 2009 (r192193) +++ head/sys/boot/zfs/zfsimpl.c Sat May 16 10:48:20 2009 (r192194) @@ -45,16 +45,13 @@ static vdev_list_t zfs_vdevs; static spa_list_t zfs_pools; static uint64_t zfs_crc64_table[256]; -static char *zfs_decomp_buf; static const dnode_phys_t *dnode_cache_obj = 0; static uint64_t dnode_cache_bn; static char *dnode_cache_buf; static char *zap_scratch; +static char *zfs_temp_buf, *zfs_temp_end, *zfs_temp_ptr; -/* - * Forward declarations. - */ -static int zio_read_phys(vdev_t *vdev, const blkptr_t *bp, void *buf, off_t offset); +#define TEMP_SIZE (1*SPA_MAXBLOCKSIZE) static void zfs_init(void) @@ -62,13 +59,37 @@ zfs_init(void) STAILQ_INIT(&zfs_vdevs); STAILQ_INIT(&zfs_pools); - zfs_decomp_buf = malloc(128*1024); - dnode_cache_buf = malloc(128*1024); - zap_scratch = malloc(128*1024); + zfs_temp_buf = malloc(TEMP_SIZE); + zfs_temp_end = zfs_temp_buf + TEMP_SIZE; + zfs_temp_ptr = zfs_temp_buf; + dnode_cache_buf = malloc(SPA_MAXBLOCKSIZE); + zap_scratch = malloc(SPA_MAXBLOCKSIZE); zfs_init_crc(); } +static char * +zfs_alloc_temp(size_t sz) +{ + char *p; + + if (zfs_temp_ptr + sz > zfs_temp_end) { + printf("ZFS: out of temporary buffer space\n"); + for (;;) ; + } + p = zfs_temp_ptr; + zfs_temp_ptr += sz; + + return (p); +} + +static void +zfs_reset_temp(void) +{ + + zfs_temp_ptr = zfs_temp_buf; +} + static int xdr_int(const unsigned char **xdr, int *ip) { @@ -299,7 +320,41 @@ nvlist_print(const unsigned char *nvlist #endif static int -vdev_mirror_read(vdev_t *vdev, void *priv, off_t offset, void *buf, size_t size) +vdev_read_phys(vdev_t *vdev, const blkptr_t *bp, void *buf, + off_t offset, size_t size) +{ + size_t psize; + int rc; + + if (bp) { + psize = BP_GET_PSIZE(bp); + } else { + psize = size; + } + + /*printf("ZFS: reading %d bytes at 0x%llx to %p\n", psize, offset, buf);*/ + rc = vdev->v_phys_read(vdev, vdev->v_read_priv, offset, buf, psize); + if (rc) + return (rc); + if (bp && zio_checksum_error(bp, buf)) + return (EIO); + + return (0); +} + +static int +vdev_disk_read(vdev_t *vdev, const blkptr_t *bp, void *buf, + off_t offset, size_t bytes) +{ + + return (vdev_read_phys(vdev, bp, buf, + offset + VDEV_LABEL_START_SIZE, bytes)); +} + + +static int +vdev_mirror_read(vdev_t *vdev, const blkptr_t *bp, void *buf, + off_t offset, size_t bytes) { vdev_t *kid; int rc; @@ -308,7 +363,7 @@ vdev_mirror_read(vdev_t *vdev, void *pri STAILQ_FOREACH(kid, &vdev->v_children, v_childlink) { if (kid->v_state != VDEV_STATE_HEALTHY) continue; - rc = kid->v_read(kid, kid->v_read_priv, offset, buf, size); + rc = kid->v_read(kid, bp, buf, offset, bytes); if (!rc) return (0); } @@ -329,7 +384,7 @@ vdev_find(uint64_t guid) } static vdev_t * -vdev_create(uint64_t guid, vdev_read_t *read, void *read_priv) +vdev_create(uint64_t guid, vdev_read_t *read) { vdev_t *vdev; @@ -339,7 +394,8 @@ vdev_create(uint64_t guid, vdev_read_t * vdev->v_guid = guid; vdev->v_state = VDEV_STATE_OFFLINE; vdev->v_read = read; - vdev->v_read_priv = read_priv; + vdev->v_phys_read = 0; + vdev->v_read_priv = 0; STAILQ_INSERT_TAIL(&zfs_vdevs, vdev, v_alllink); return (vdev); @@ -349,7 +405,7 @@ static int vdev_init_from_nvlist(const unsigned char *nvlist, vdev_t **vdevp) { int rc; - uint64_t guid, id; + uint64_t guid, id, ashift, nparity; const char *type; const char *path; vdev_t *vdev, *kid; @@ -378,17 +434,30 @@ vdev_init_from_nvlist(const unsigned cha } if (strcmp(type, VDEV_TYPE_MIRROR) - && strcmp(type, VDEV_TYPE_DISK)) { - printf("ZFS: can only boot from disk or mirror vdevs\n"); + && strcmp(type, VDEV_TYPE_DISK) + && strcmp(type, VDEV_TYPE_RAIDZ)) { + printf("ZFS: can only boot from disk, mirror or raidz vdevs\n"); return (EIO); } if (!strcmp(type, VDEV_TYPE_MIRROR)) - vdev = vdev_create(guid, vdev_mirror_read, 0); + vdev = vdev_create(guid, vdev_mirror_read); + else if (!strcmp(type, VDEV_TYPE_RAIDZ)) + vdev = vdev_create(guid, vdev_raidz_read); else - vdev = vdev_create(guid, 0, 0); - + vdev = vdev_create(guid, vdev_disk_read); + vdev->v_id = id; + if (nvlist_find(nvlist, ZPOOL_CONFIG_ASHIFT, + DATA_TYPE_UINT64, 0, &ashift) == 0) + vdev->v_ashift = ashift; + else + vdev->v_ashift = 0; + if (nvlist_find(nvlist, ZPOOL_CONFIG_NPARITY, + DATA_TYPE_UINT64, 0, &nparity) == 0) + vdev->v_nparity = nparity; + else + vdev->v_nparity = 0; if (nvlist_find(nvlist, ZPOOL_CONFIG_PATH, DATA_TYPE_STRING, 0, &path) == 0) { if (strlen(path) > 5 @@ -400,15 +469,22 @@ vdev_init_from_nvlist(const unsigned cha path += 5; vdev->v_name = strdup(path); } else { - vdev->v_name = strdup(type); + if (!strcmp(type, "raidz")) { + if (vdev->v_nparity == 1) + vdev->v_name = "raidz1"; + else + vdev->v_name = "raidz2"; + } else { + vdev->v_name = strdup(type); + } } - vdev->v_id = id; rc = nvlist_find(nvlist, ZPOOL_CONFIG_CHILDREN, DATA_TYPE_NVLIST_ARRAY, &nkids, &kids); /* * Its ok if we don't have any kids. */ if (rc == 0) { + vdev->v_nchildren = nkids; for (i = 0; i < nkids; i++) { rc = vdev_init_from_nvlist(kids, &kid); if (rc) @@ -416,6 +492,8 @@ vdev_init_from_nvlist(const unsigned cha STAILQ_INSERT_TAIL(&vdev->v_children, kid, v_childlink); kids = nvlist_next(kids); } + } else { + vdev->v_nchildren = 0; } if (vdevp) @@ -431,11 +509,10 @@ vdev_set_state(vdev_t *vdev) int bad_kids; /* - * We assume that if we have kids, we are a mirror. A mirror - * is healthy if all its kids are healthy. Its degraded (but - * working) if at least one kid is healty. + * A mirror or raidz is healthy if all its kids are healthy. A + * mirror is degraded if any of its kids is healthy; a raidz + * is degraded if at most nparity kids are offline. */ - if (STAILQ_FIRST(&vdev->v_children)) { good_kids = 0; bad_kids = 0; @@ -445,13 +522,22 @@ vdev_set_state(vdev_t *vdev) else bad_kids++; } - if (good_kids) { - if (!bad_kids && good_kids) - vdev->v_state = VDEV_STATE_HEALTHY; - else - vdev->v_state = VDEV_STATE_DEGRADED; + if (bad_kids == 0) { + vdev->v_state = VDEV_STATE_HEALTHY; } else { - vdev->v_state = VDEV_STATE_OFFLINE; + if (vdev->v_read == vdev_mirror_read) { + if (good_kids) { + vdev->v_state = VDEV_STATE_DEGRADED; + } else { + vdev->v_state = VDEV_STATE_OFFLINE; + } + } else if (vdev->v_read == vdev_raidz_read) { + if (bad_kids > vdev->v_nparity) { + vdev->v_state = VDEV_STATE_OFFLINE; + } else { + vdev->v_state = VDEV_STATE_DEGRADED; + } + } } } } @@ -609,7 +695,7 @@ spa_all_status(void) } static int -vdev_probe(vdev_read_t *read, void *read_priv, spa_t **spap) +vdev_probe(vdev_phys_read_t *read, void *read_priv, spa_t **spap) { vdev_t vtmp; vdev_phys_t *vdev_label = (vdev_phys_t *) zap_scratch; @@ -632,7 +718,7 @@ vdev_probe(vdev_read_t *read, void *read * uberblock is most current. */ memset(&vtmp, 0, sizeof(vtmp)); - vtmp.v_read = read; + vtmp.v_phys_read = read; vtmp.v_read_priv = read_priv; off = offsetof(vdev_label_t, vl_vdev_phys); BP_ZERO(&bp); @@ -641,7 +727,7 @@ vdev_probe(vdev_read_t *read, void *read BP_SET_CHECKSUM(&bp, ZIO_CHECKSUM_LABEL); BP_SET_COMPRESS(&bp, ZIO_COMPRESS_OFF); ZIO_SET_CHECKSUM(&bp.blk_cksum, off, 0, 0, 0); - if (zio_read_phys(&vtmp, &bp, vdev_label, off)) + if (vdev_read_phys(&vtmp, &bp, vdev_label, off, 0)) return (EIO); if (vdev_label->vp_nvlist[0] != NV_ENCODE_XDR) { @@ -668,6 +754,7 @@ vdev_probe(vdev_read_t *read, void *read return (EIO); } +#ifndef TEST if (val != POOL_STATE_ACTIVE) { /* * Don't print a message here. If we happen to reboot @@ -677,6 +764,7 @@ vdev_probe(vdev_read_t *read, void *read /*printf("ZFS: pool is not active\n");*/ return (EIO); } +#endif if (nvlist_find(nvlist, ZPOOL_CONFIG_POOL_TXG, @@ -687,7 +775,11 @@ vdev_probe(vdev_read_t *read, void *read || nvlist_find(nvlist, ZPOOL_CONFIG_POOL_NAME, DATA_TYPE_STRING, 0, &pool_name)) { - printf("ZFS: can't find pool details\n"); + /* + * Cache and spare devices end up here - just ignore + * them. + */ + /*printf("ZFS: can't find pool details\n");*/ return (EIO); } @@ -742,7 +834,7 @@ vdev_probe(vdev_read_t *read, void *read */ vdev = vdev_find(guid); if (vdev) { - vdev->v_read = read; + vdev->v_phys_read = read; vdev->v_read_priv = read_priv; vdev->v_state = VDEV_STATE_HEALTHY; } else { @@ -772,7 +864,7 @@ vdev_probe(vdev_read_t *read, void *read BP_SET_CHECKSUM(&bp, ZIO_CHECKSUM_LABEL); BP_SET_COMPRESS(&bp, ZIO_COMPRESS_OFF); ZIO_SET_CHECKSUM(&bp.blk_cksum, off, 0, 0, 0); - if (zio_read_phys(vdev, &bp, upbuf, off)) + if (vdev_read_phys(vdev, &bp, upbuf, off, 0)) continue; up = (const struct uberblock *) upbuf; @@ -805,39 +897,20 @@ ilog2(int n) } static int -zio_read_phys(vdev_t *vdev, const blkptr_t *bp, void *buf, off_t offset) +zio_read(spa_t *spa, const blkptr_t *bp, void *buf) { int cpfunc = BP_GET_COMPRESS(bp); size_t lsize = BP_GET_LSIZE(bp); size_t psize = BP_GET_PSIZE(bp); - int rc; - - /*printf("ZFS: reading %d bytes at 0x%llx to %p\n", psize, offset, buf);*/ - if (cpfunc != ZIO_COMPRESS_OFF) { - rc = vdev->v_read(vdev, vdev->v_read_priv, offset, zfs_decomp_buf, psize); - if (rc) - return (rc); - if (zio_checksum_error(bp, zfs_decomp_buf)) - return (EIO); - if (zio_decompress_data(cpfunc, zfs_decomp_buf, psize, - buf, lsize)) - return (EIO); - } else { - rc = vdev->v_read(vdev, vdev->v_read_priv, offset, buf, psize); - if (rc) - return (rc); - - if (zio_checksum_error(bp, buf)) - return (EIO); - } - return (0); -} - -static int -zio_read(spa_t *spa, const blkptr_t *bp, void *buf) -{ + void *pbuf; int i; + zfs_reset_temp(); + if (cpfunc != ZIO_COMPRESS_OFF) + pbuf = zfs_alloc_temp(psize); + else + pbuf = buf; + for (i = 0; i < SPA_DVAS_PER_BP; i++) { const dva_t *dva = &bp->blk_dva[i]; vdev_t *vdev; @@ -848,15 +921,21 @@ zio_read(spa_t *spa, const blkptr_t *bp, continue; vdevid = DVA_GET_VDEV(dva); - offset = DVA_GET_OFFSET(dva) + VDEV_LABEL_START_SIZE; + offset = DVA_GET_OFFSET(dva); STAILQ_FOREACH(vdev, &spa->spa_vdevs, v_childlink) if (vdev->v_id == vdevid) break; if (!vdev || !vdev->v_read) continue; - if (zio_read_phys(vdev, bp, buf, offset)) + if (vdev->v_read(vdev, bp, pbuf, offset, psize)) continue; + if (cpfunc != ZIO_COMPRESS_OFF) { + if (zio_decompress_data(cpfunc, pbuf, psize, + buf, lsize)) + return (EIO); + } + return (0); } printf("ZFS: i/o error - all block copies unavailable\n"); Modified: head/sys/cddl/boot/zfs/README ============================================================================== --- head/sys/cddl/boot/zfs/README Sat May 16 10:42:00 2009 (r192193) +++ head/sys/cddl/boot/zfs/README Sat May 16 10:48:20 2009 (r192194) @@ -6,7 +6,7 @@ are used by the ZFS bootstrap: fletcher.c checksum support sha256.c checksum support lzjb.c compression support - zfssubr.c mostly checksum and compression support + zfssubr.c checksum, compression and raidz support zfsimpl.h mostly describing the physical layout The files fletcher.c, lzjb.c and sha256.c are largely identical to the Modified: head/sys/cddl/boot/zfs/zfsimpl.h ============================================================================== --- head/sys/cddl/boot/zfs/zfsimpl.h Sat May 16 10:42:00 2009 (r192193) +++ head/sys/cddl/boot/zfs/zfsimpl.h Sat May 16 10:48:20 2009 (r192194) @@ -1137,7 +1137,10 @@ typedef struct znode_phys { * In-core vdev representation. */ struct vdev; -typedef int vdev_read_t(struct vdev *vdev, void *priv, off_t offset, void *buf, size_t bytes); +typedef int vdev_phys_read_t(struct vdev *vdev, void *priv, + off_t offset, void *buf, size_t bytes); +typedef int vdev_read_t(struct vdev *vdev, const blkptr_t *bp, + void *buf, off_t offset, size_t bytes); typedef STAILQ_HEAD(vdev_list, vdev) vdev_list_t; @@ -1148,8 +1151,12 @@ typedef struct vdev { char *v_name; /* vdev name */ uint64_t v_guid; /* vdev guid */ int v_id; /* index in parent */ + int v_ashift; /* offset to block shift */ + int v_nparity; /* # parity for raidz */ + int v_nchildren; /* # children */ vdev_state_t v_state; /* current state */ - vdev_read_t *v_read; /* function to read from this vdev */ + vdev_phys_read_t *v_phys_read; /* read from raw leaf vdev */ + vdev_read_t *v_read; /* read from vdev */ void *v_read_priv; /* private data for read function */ } vdev_t; Modified: head/sys/cddl/boot/zfs/zfssubr.c ============================================================================== --- head/sys/cddl/boot/zfs/zfssubr.c Sat May 16 10:42:00 2009 (r192193) +++ head/sys/cddl/boot/zfs/zfssubr.c Sat May 16 10:48:20 2009 (r192194) @@ -191,3 +191,735 @@ zap_hash(uint64_t salt, const char *name return (crc); } + +static char *zfs_alloc_temp(size_t sz); + +typedef struct raidz_col { + uint64_t rc_devidx; /* child device index for I/O */ + uint64_t rc_offset; /* device offset */ + uint64_t rc_size; /* I/O size */ + void *rc_data; /* I/O data */ + int rc_error; /* I/O error for this device */ + uint8_t rc_tried; /* Did we attempt this I/O column? */ + uint8_t rc_skipped; /* Did we skip this I/O column? */ +} raidz_col_t; + +#define VDEV_RAIDZ_P 0 +#define VDEV_RAIDZ_Q 1 + +static void +vdev_raidz_reconstruct_p(raidz_col_t *cols, int nparity, int acols, int x) +{ + uint64_t *dst, *src, xcount, ccount, count, i; + int c; + + xcount = cols[x].rc_size / sizeof (src[0]); + //ASSERT(xcount <= cols[VDEV_RAIDZ_P].rc_size / sizeof (src[0])); + //ASSERT(xcount > 0); + + src = cols[VDEV_RAIDZ_P].rc_data; + dst = cols[x].rc_data; + for (i = 0; i < xcount; i++, dst++, src++) { + *dst = *src; + } + + for (c = nparity; c < acols; c++) { + src = cols[c].rc_data; + dst = cols[x].rc_data; + + if (c == x) + continue; + + ccount = cols[c].rc_size / sizeof (src[0]); + count = MIN(ccount, xcount); + + for (i = 0; i < count; i++, dst++, src++) { + *dst ^= *src; + } + } +} + +/* + * These two tables represent powers and logs of 2 in the Galois field defined + * above. These values were computed by repeatedly multiplying by 2 as above. + */ +static const uint8_t vdev_raidz_pow2[256] = { + 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, + 0x1d, 0x3a, 0x74, 0xe8, 0xcd, 0x87, 0x13, 0x26, + 0x4c, 0x98, 0x2d, 0x5a, 0xb4, 0x75, 0xea, 0xc9, + 0x8f, 0x03, 0x06, 0x0c, 0x18, 0x30, 0x60, 0xc0, + 0x9d, 0x27, 0x4e, 0x9c, 0x25, 0x4a, 0x94, 0x35, + 0x6a, 0xd4, 0xb5, 0x77, 0xee, 0xc1, 0x9f, 0x23, + 0x46, 0x8c, 0x05, 0x0a, 0x14, 0x28, 0x50, 0xa0, + 0x5d, 0xba, 0x69, 0xd2, 0xb9, 0x6f, 0xde, 0xa1, + 0x5f, 0xbe, 0x61, 0xc2, 0x99, 0x2f, 0x5e, 0xbc, + 0x65, 0xca, 0x89, 0x0f, 0x1e, 0x3c, 0x78, 0xf0, + 0xfd, 0xe7, 0xd3, 0xbb, 0x6b, 0xd6, 0xb1, 0x7f, + 0xfe, 0xe1, 0xdf, 0xa3, 0x5b, 0xb6, 0x71, 0xe2, + 0xd9, 0xaf, 0x43, 0x86, 0x11, 0x22, 0x44, 0x88, + 0x0d, 0x1a, 0x34, 0x68, 0xd0, 0xbd, 0x67, 0xce, + 0x81, 0x1f, 0x3e, 0x7c, 0xf8, 0xed, 0xc7, 0x93, + 0x3b, 0x76, 0xec, 0xc5, 0x97, 0x33, 0x66, 0xcc, + 0x85, 0x17, 0x2e, 0x5c, 0xb8, 0x6d, 0xda, 0xa9, + 0x4f, 0x9e, 0x21, 0x42, 0x84, 0x15, 0x2a, 0x54, + 0xa8, 0x4d, 0x9a, 0x29, 0x52, 0xa4, 0x55, 0xaa, + 0x49, 0x92, 0x39, 0x72, 0xe4, 0xd5, 0xb7, 0x73, + 0xe6, 0xd1, 0xbf, 0x63, 0xc6, 0x91, 0x3f, 0x7e, + 0xfc, 0xe5, 0xd7, 0xb3, 0x7b, 0xf6, 0xf1, 0xff, + 0xe3, 0xdb, 0xab, 0x4b, 0x96, 0x31, 0x62, 0xc4, + 0x95, 0x37, 0x6e, 0xdc, 0xa5, 0x57, 0xae, 0x41, + 0x82, 0x19, 0x32, 0x64, 0xc8, 0x8d, 0x07, 0x0e, + 0x1c, 0x38, 0x70, 0xe0, 0xdd, 0xa7, 0x53, 0xa6, + 0x51, 0xa2, 0x59, 0xb2, 0x79, 0xf2, 0xf9, 0xef, + 0xc3, 0x9b, 0x2b, 0x56, 0xac, 0x45, 0x8a, 0x09, + 0x12, 0x24, 0x48, 0x90, 0x3d, 0x7a, 0xf4, 0xf5, + 0xf7, 0xf3, 0xfb, 0xeb, 0xcb, 0x8b, 0x0b, 0x16, + 0x2c, 0x58, 0xb0, 0x7d, 0xfa, 0xe9, 0xcf, 0x83, + 0x1b, 0x36, 0x6c, 0xd8, 0xad, 0x47, 0x8e, 0x01 +}; +static const uint8_t vdev_raidz_log2[256] = { + 0x00, 0x00, 0x01, 0x19, 0x02, 0x32, 0x1a, 0xc6, + 0x03, 0xdf, 0x33, 0xee, 0x1b, 0x68, 0xc7, 0x4b, + 0x04, 0x64, 0xe0, 0x0e, 0x34, 0x8d, 0xef, 0x81, + 0x1c, 0xc1, 0x69, 0xf8, 0xc8, 0x08, 0x4c, 0x71, + 0x05, 0x8a, 0x65, 0x2f, 0xe1, 0x24, 0x0f, 0x21, + 0x35, 0x93, 0x8e, 0xda, 0xf0, 0x12, 0x82, 0x45, + 0x1d, 0xb5, 0xc2, 0x7d, 0x6a, 0x27, 0xf9, 0xb9, + 0xc9, 0x9a, 0x09, 0x78, 0x4d, 0xe4, 0x72, 0xa6, + 0x06, 0xbf, 0x8b, 0x62, 0x66, 0xdd, 0x30, 0xfd, + 0xe2, 0x98, 0x25, 0xb3, 0x10, 0x91, 0x22, 0x88, + 0x36, 0xd0, 0x94, 0xce, 0x8f, 0x96, 0xdb, 0xbd, + 0xf1, 0xd2, 0x13, 0x5c, 0x83, 0x38, 0x46, 0x40, + 0x1e, 0x42, 0xb6, 0xa3, 0xc3, 0x48, 0x7e, 0x6e, + 0x6b, 0x3a, 0x28, 0x54, 0xfa, 0x85, 0xba, 0x3d, + 0xca, 0x5e, 0x9b, 0x9f, 0x0a, 0x15, 0x79, 0x2b, + 0x4e, 0xd4, 0xe5, 0xac, 0x73, 0xf3, 0xa7, 0x57, + 0x07, 0x70, 0xc0, 0xf7, 0x8c, 0x80, 0x63, 0x0d, + 0x67, 0x4a, 0xde, 0xed, 0x31, 0xc5, 0xfe, 0x18, + 0xe3, 0xa5, 0x99, 0x77, 0x26, 0xb8, 0xb4, 0x7c, + 0x11, 0x44, 0x92, 0xd9, 0x23, 0x20, 0x89, 0x2e, + 0x37, 0x3f, 0xd1, 0x5b, 0x95, 0xbc, 0xcf, 0xcd, + 0x90, 0x87, 0x97, 0xb2, 0xdc, 0xfc, 0xbe, 0x61, + 0xf2, 0x56, 0xd3, 0xab, 0x14, 0x2a, 0x5d, 0x9e, + 0x84, 0x3c, 0x39, 0x53, 0x47, 0x6d, 0x41, 0xa2, + 0x1f, 0x2d, 0x43, 0xd8, 0xb7, 0x7b, 0xa4, 0x76, + 0xc4, 0x17, 0x49, 0xec, 0x7f, 0x0c, 0x6f, 0xf6, + 0x6c, 0xa1, 0x3b, 0x52, 0x29, 0x9d, 0x55, 0xaa, + 0xfb, 0x60, 0x86, 0xb1, 0xbb, 0xcc, 0x3e, 0x5a, + 0xcb, 0x59, 0x5f, 0xb0, 0x9c, 0xa9, 0xa0, 0x51, + 0x0b, 0xf5, 0x16, 0xeb, 0x7a, 0x75, 0x2c, 0xd7, + 0x4f, 0xae, 0xd5, 0xe9, 0xe6, 0xe7, 0xad, 0xe8, + 0x74, 0xd6, 0xf4, 0xea, 0xa8, 0x50, 0x58, 0xaf, +}; + +/* + * Multiply a given number by 2 raised to the given power. + */ +static uint8_t +vdev_raidz_exp2(uint8_t a, int exp) +{ + if (a == 0) + return (0); + + //ASSERT(exp >= 0); + //ASSERT(vdev_raidz_log2[a] > 0 || a == 1); + + exp += vdev_raidz_log2[a]; + if (exp > 255) + exp -= 255; + + return (vdev_raidz_pow2[exp]); +} + +static void +vdev_raidz_generate_parity_pq(raidz_col_t *cols, int nparity, int acols) +{ + uint64_t *q, *p, *src, pcount, ccount, mask, i; + int c; + + pcount = cols[VDEV_RAIDZ_P].rc_size / sizeof (src[0]); + //ASSERT(cols[VDEV_RAIDZ_P].rc_size == cols[VDEV_RAIDZ_Q].rc_size); + + for (c = nparity; c < acols; c++) { + src = cols[c].rc_data; + p = cols[VDEV_RAIDZ_P].rc_data; + q = cols[VDEV_RAIDZ_Q].rc_data; + ccount = cols[c].rc_size / sizeof (src[0]); + + if (c == nparity) { + //ASSERT(ccount == pcount || ccount == 0); + for (i = 0; i < ccount; i++, p++, q++, src++) { + *q = *src; + *p = *src; + } + for (; i < pcount; i++, p++, q++, src++) { + *q = 0; + *p = 0; + } + } else { + //ASSERT(ccount <= pcount); + + /* + * Rather than multiplying each byte + * individually (as described above), we are + * able to handle 8 at once by generating a + * mask based on the high bit in each byte and + * using that to conditionally XOR in 0x1d. + */ + for (i = 0; i < ccount; i++, p++, q++, src++) { + mask = *q & 0x8080808080808080ULL; + mask = (mask << 1) - (mask >> 7); + *q = ((*q << 1) & 0xfefefefefefefefeULL) ^ + (mask & 0x1d1d1d1d1d1d1d1dULL); + *q ^= *src; + *p ^= *src; + } + + /* + * Treat short columns as though they are full of 0s. + */ + for (; i < pcount; i++, q++) { + mask = *q & 0x8080808080808080ULL; + mask = (mask << 1) - (mask >> 7); + *q = ((*q << 1) & 0xfefefefefefefefeULL) ^ + (mask & 0x1d1d1d1d1d1d1d1dULL); + } + } + } +} + +static void +vdev_raidz_reconstruct_q(raidz_col_t *cols, int nparity, int acols, int x) +{ + uint64_t *dst, *src, xcount, ccount, count, mask, i; + uint8_t *b; + int c, j, exp; + + xcount = cols[x].rc_size / sizeof (src[0]); + //ASSERT(xcount <= cols[VDEV_RAIDZ_Q].rc_size / sizeof (src[0])); + + for (c = nparity; c < acols; c++) { + src = cols[c].rc_data; + dst = cols[x].rc_data; + + if (c == x) + ccount = 0; + else + ccount = cols[c].rc_size / sizeof (src[0]); + + count = MIN(ccount, xcount); + + if (c == nparity) { + for (i = 0; i < count; i++, dst++, src++) { + *dst = *src; + } + for (; i < xcount; i++, dst++) { + *dst = 0; + } + + } else { + /* + * For an explanation of this, see the comment in + * vdev_raidz_generate_parity_pq() above. + */ + for (i = 0; i < count; i++, dst++, src++) { + mask = *dst & 0x8080808080808080ULL; + mask = (mask << 1) - (mask >> 7); + *dst = ((*dst << 1) & 0xfefefefefefefefeULL) ^ + (mask & 0x1d1d1d1d1d1d1d1dULL); + *dst ^= *src; + } + + for (; i < xcount; i++, dst++) { + mask = *dst & 0x8080808080808080ULL; + mask = (mask << 1) - (mask >> 7); + *dst = ((*dst << 1) & 0xfefefefefefefefeULL) ^ + (mask & 0x1d1d1d1d1d1d1d1dULL); + } + } + } + + src = cols[VDEV_RAIDZ_Q].rc_data; + dst = cols[x].rc_data; + exp = 255 - (acols - 1 - x); + + for (i = 0; i < xcount; i++, dst++, src++) { + *dst ^= *src; + for (j = 0, b = (uint8_t *)dst; j < 8; j++, b++) { + *b = vdev_raidz_exp2(*b, exp); + } + } +} + + +static void +vdev_raidz_reconstruct_pq(raidz_col_t *cols, int nparity, int acols, + int x, int y) +{ + uint8_t *p, *q, *pxy, *qxy, *xd, *yd, tmp, a, b, aexp, bexp; + void *pdata, *qdata; + uint64_t xsize, ysize, i; + + //ASSERT(x < y); + //ASSERT(x >= nparity); + //ASSERT(y < acols); + + //ASSERT(cols[x].rc_size >= cols[y].rc_size); + + /* + * Move the parity data aside -- we're going to compute parity as + * though columns x and y were full of zeros -- Pxy and Qxy. We want to + * reuse the parity generation mechanism without trashing the actual + * parity so we make those columns appear to be full of zeros by + * setting their lengths to zero. + */ + pdata = cols[VDEV_RAIDZ_P].rc_data; + qdata = cols[VDEV_RAIDZ_Q].rc_data; + xsize = cols[x].rc_size; + ysize = cols[y].rc_size; + + cols[VDEV_RAIDZ_P].rc_data = + zfs_alloc_temp(cols[VDEV_RAIDZ_P].rc_size); + cols[VDEV_RAIDZ_Q].rc_data = + zfs_alloc_temp(cols[VDEV_RAIDZ_Q].rc_size); + cols[x].rc_size = 0; + cols[y].rc_size = 0; + + vdev_raidz_generate_parity_pq(cols, nparity, acols); + + cols[x].rc_size = xsize; + cols[y].rc_size = ysize; + + p = pdata; + q = qdata; + pxy = cols[VDEV_RAIDZ_P].rc_data; + qxy = cols[VDEV_RAIDZ_Q].rc_data; + xd = cols[x].rc_data; + yd = cols[y].rc_data; + + /* + * We now have: + * Pxy = P + D_x + D_y + * Qxy = Q + 2^(ndevs - 1 - x) * D_x + 2^(ndevs - 1 - y) * D_y + * + * We can then solve for D_x: + * D_x = A * (P + Pxy) + B * (Q + Qxy) + * where + * A = 2^(x - y) * (2^(x - y) + 1)^-1 + * B = 2^(ndevs - 1 - x) * (2^(x - y) + 1)^-1 + * + * With D_x in hand, we can easily solve for D_y: + * D_y = P + Pxy + D_x + */ + + a = vdev_raidz_pow2[255 + x - y]; + b = vdev_raidz_pow2[255 - (acols - 1 - x)]; + tmp = 255 - vdev_raidz_log2[a ^ 1]; + + aexp = vdev_raidz_log2[vdev_raidz_exp2(a, tmp)]; + bexp = vdev_raidz_log2[vdev_raidz_exp2(b, tmp)]; + + for (i = 0; i < xsize; i++, p++, q++, pxy++, qxy++, xd++, yd++) { + *xd = vdev_raidz_exp2(*p ^ *pxy, aexp) ^ + vdev_raidz_exp2(*q ^ *qxy, bexp); + + if (i < ysize) + *yd = *p ^ *pxy ^ *xd; + } + + /* + * Restore the saved parity data. + */ + cols[VDEV_RAIDZ_P].rc_data = pdata; + cols[VDEV_RAIDZ_Q].rc_data = qdata; +} + +static int +vdev_raidz_read(vdev_t *vdev, const blkptr_t *bp, void *buf, + off_t offset, size_t bytes) +{ + size_t psize = BP_GET_PSIZE(bp); + vdev_t *kid; + int unit_shift = vdev->v_ashift; + int dcols = vdev->v_nchildren; + int nparity = vdev->v_nparity; + int missingdata, missingparity; + int parity_errors, data_errors, unexpected_errors, total_errors; + int parity_untried; + uint64_t b = offset >> unit_shift; + uint64_t s = psize >> unit_shift; + uint64_t f = b % dcols; + uint64_t o = (b / dcols) << unit_shift; + int q, r, c, c1, bc, col, acols, coff, devidx, asize, n; + static raidz_col_t cols[16]; + raidz_col_t *rc, *rc1; + + q = s / (dcols - nparity); + r = s - q * (dcols - nparity); + bc = (r == 0 ? 0 : r + nparity); + + acols = (q == 0 ? bc : dcols); + asize = 0; + + for (c = 0; c < acols; c++) { + col = f + c; + coff = o; + if (col >= dcols) { + col -= dcols; + coff += 1ULL << unit_shift; + } + cols[c].rc_devidx = col; + cols[c].rc_offset = coff; + cols[c].rc_size = (q + (c < bc)) << unit_shift; + cols[c].rc_data = NULL; + cols[c].rc_error = 0; + cols[c].rc_tried = 0; + cols[c].rc_skipped = 0; + asize += cols[c].rc_size; + } + + asize = roundup(asize, (nparity + 1) << unit_shift); + + for (c = 0; c < nparity; c++) { + cols[c].rc_data = zfs_alloc_temp(cols[c].rc_size); + } + + cols[c].rc_data = buf; + + for (c = c + 1; c < acols; c++) + cols[c].rc_data = (char *)cols[c - 1].rc_data + + cols[c - 1].rc_size; + + /* + * If all data stored spans all columns, there's a danger that + * parity will always be on the same device and, since parity + * isn't read during normal operation, that that device's I/O + * bandwidth won't be used effectively. We therefore switch + * the parity every 1MB. + * + * ... at least that was, ostensibly, the theory. As a + * practical matter unless we juggle the parity between all + * devices evenly, we won't see any benefit. Further, + * occasional writes that aren't a multiple of the LCM of the + * number of children and the minimum stripe width are + * sufficient to avoid pessimal behavior. Unfortunately, this + * decision created an implicit on-disk format requirement + * that we need to support for all eternity, but only for + * single-parity RAID-Z. + */ + //ASSERT(acols >= 2); + //ASSERT(cols[0].rc_size == cols[1].rc_size); + + if (nparity == 1 && (offset & (1ULL << 20))) { + devidx = cols[0].rc_devidx; + o = cols[0].rc_offset; + cols[0].rc_devidx = cols[1].rc_devidx; + cols[0].rc_offset = cols[1].rc_offset; + cols[1].rc_devidx = devidx; + cols[1].rc_offset = o; + } + + /* + * Iterate over the columns in reverse order so that we hit + * the parity last -- any errors along the way will force us + * to read the parity data. + */ + missingdata = 0; + missingparity = 0; + for (c = acols - 1; c >= 0; c--) { + rc = &cols[c]; + devidx = rc->rc_devidx; + STAILQ_FOREACH(kid, &vdev->v_children, v_childlink) + if (kid->v_id == devidx) + break; + if (kid == NULL || kid->v_state != VDEV_STATE_HEALTHY) { + if (c >= nparity) + missingdata++; + else + missingparity++; + rc->rc_error = ENXIO; + rc->rc_tried = 1; /* don't even try */ + rc->rc_skipped = 1; + continue; + } +#if 0 + /* + * Too hard for the bootcode + */ + if (vdev_dtl_contains(&cvd->vdev_dtl_map, bp->blk_birth, 1)) { + if (c >= nparity) + rm->rm_missingdata++; + else + rm->rm_missingparity++; + rc->rc_error = ESTALE; + rc->rc_skipped = 1; + continue; *** DIFF OUTPUT TRUNCATED AT 1000 LINES ***
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