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zfsimpl.c
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/*-
* Copyright (c) 2007 Doug Rabson
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: stable/9/sys/boot/zfs/zfsimpl.c 243674 2012-11-29 14:05:04Z mm $");
/*
* Stand-alone ZFS file reader.
*/
#include <sys/stat.h>
#include <sys/stdint.h>
#include "zfsimpl.h"
#include "zfssubr.c"
struct zfsmount {
const spa_t *spa;
objset_phys_t objset;
uint64_t rootobj;
};
/*
* List of all vdevs, chained through v_alllink.
*/
static vdev_list_t zfs_vdevs;
/*
* List of ZFS features supported for read
*/
static const char *features_for_read[] = {
NULL
};
/*
* List of all pools, chained through spa_link.
*/
static spa_list_t zfs_pools;
static uint64_t zfs_crc64_table[256];
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;
#define TEMP_SIZE (1024 * 1024)
static int zio_read(const spa_t *spa, const blkptr_t *bp, void *buf);
static int zfs_get_root(const spa_t *spa, uint64_t *objid);
static int zfs_rlookup(const spa_t *spa, uint64_t objnum, char *result);
static void
zfs_init(void)
{
STAILQ_INIT(&zfs_vdevs);
STAILQ_INIT(&zfs_pools);
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 void *
zfs_alloc(size_t size)
{
char *ptr;
if (zfs_temp_ptr + size > zfs_temp_end) {
printf("ZFS: out of temporary buffer space\n");
for (;;) ;
}
ptr = zfs_temp_ptr;
zfs_temp_ptr += size;
return (ptr);
}
static void
zfs_free(void *ptr, size_t size)
{
zfs_temp_ptr -= size;
if (zfs_temp_ptr != ptr) {
printf("ZFS: zfs_alloc()/zfs_free() mismatch\n");
for (;;) ;
}
}
static int
xdr_int(const unsigned char **xdr, int *ip)
{
*ip = ((*xdr)[0] << 24)
| ((*xdr)[1] << 16)
| ((*xdr)[2] << 8)
| ((*xdr)[3] << 0);
(*xdr) += 4;
return (0);
}
static int
xdr_u_int(const unsigned char **xdr, u_int *ip)
{
*ip = ((*xdr)[0] << 24)
| ((*xdr)[1] << 16)
| ((*xdr)[2] << 8)
| ((*xdr)[3] << 0);
(*xdr) += 4;
return (0);
}
static int
xdr_uint64_t(const unsigned char **xdr, uint64_t *lp)
{
u_int hi, lo;
xdr_u_int(xdr, &hi);
xdr_u_int(xdr, &lo);
*lp = (((uint64_t) hi) << 32) | lo;
return (0);
}
static int
nvlist_find(const unsigned char *nvlist, const char *name, int type,
int* elementsp, void *valuep)
{
const unsigned char *p, *pair;
int junk;
int encoded_size, decoded_size;
p = nvlist;
xdr_int(&p, &junk);
xdr_int(&p, &junk);
pair = p;
xdr_int(&p, &encoded_size);
xdr_int(&p, &decoded_size);
while (encoded_size && decoded_size) {
int namelen, pairtype, elements;
const char *pairname;
xdr_int(&p, &namelen);
pairname = (const char*) p;
p += roundup(namelen, 4);
xdr_int(&p, &pairtype);
if (!memcmp(name, pairname, namelen) && type == pairtype) {
xdr_int(&p, &elements);
if (elementsp)
*elementsp = elements;
if (type == DATA_TYPE_UINT64) {
xdr_uint64_t(&p, (uint64_t *) valuep);
return (0);
} else if (type == DATA_TYPE_STRING) {
int len;
xdr_int(&p, &len);
(*(const char**) valuep) = (const char*) p;
return (0);
} else if (type == DATA_TYPE_NVLIST
|| type == DATA_TYPE_NVLIST_ARRAY) {
(*(const unsigned char**) valuep) =
(const unsigned char*) p;
return (0);
} else {
return (EIO);
}
} else {
/*
* Not the pair we are looking for, skip to the next one.
*/
p = pair + encoded_size;
}
pair = p;
xdr_int(&p, &encoded_size);
xdr_int(&p, &decoded_size);
}
return (EIO);
}
static int
nvlist_check_features_for_read(const unsigned char *nvlist)
{
const unsigned char *p, *pair;
int junk;
int encoded_size, decoded_size;
int rc;
rc = 0;
p = nvlist;
xdr_int(&p, &junk);
xdr_int(&p, &junk);
pair = p;
xdr_int(&p, &encoded_size);
xdr_int(&p, &decoded_size);
while (encoded_size && decoded_size) {
int namelen, pairtype;
const char *pairname;
int i, found;
found = 0;
xdr_int(&p, &namelen);
pairname = (const char*) p;
p += roundup(namelen, 4);
xdr_int(&p, &pairtype);
for (i = 0; features_for_read[i] != NULL; i++) {
if (!memcmp(pairname, features_for_read[i], namelen)) {
found = 1;
break;
}
}
if (!found) {
printf("ZFS: unsupported feature: %s\n", pairname);
rc = EIO;
}
p = pair + encoded_size;
pair = p;
xdr_int(&p, &encoded_size);
xdr_int(&p, &decoded_size);
}
return (rc);
}
/*
* Return the next nvlist in an nvlist array.
*/
static const unsigned char *
nvlist_next(const unsigned char *nvlist)
{
const unsigned char *p, *pair;
int junk;
int encoded_size, decoded_size;
p = nvlist;
xdr_int(&p, &junk);
xdr_int(&p, &junk);
pair = p;
xdr_int(&p, &encoded_size);
xdr_int(&p, &decoded_size);
while (encoded_size && decoded_size) {
p = pair + encoded_size;
pair = p;
xdr_int(&p, &encoded_size);
xdr_int(&p, &decoded_size);
}
return p;
}
#ifdef TEST
static const unsigned char *
nvlist_print(const unsigned char *nvlist, unsigned int indent)
{
static const char* typenames[] = {
"DATA_TYPE_UNKNOWN",
"DATA_TYPE_BOOLEAN",
"DATA_TYPE_BYTE",
"DATA_TYPE_INT16",
"DATA_TYPE_UINT16",
"DATA_TYPE_INT32",
"DATA_TYPE_UINT32",
"DATA_TYPE_INT64",
"DATA_TYPE_UINT64",
"DATA_TYPE_STRING",
"DATA_TYPE_BYTE_ARRAY",
"DATA_TYPE_INT16_ARRAY",
"DATA_TYPE_UINT16_ARRAY",
"DATA_TYPE_INT32_ARRAY",
"DATA_TYPE_UINT32_ARRAY",
"DATA_TYPE_INT64_ARRAY",
"DATA_TYPE_UINT64_ARRAY",
"DATA_TYPE_STRING_ARRAY",
"DATA_TYPE_HRTIME",
"DATA_TYPE_NVLIST",
"DATA_TYPE_NVLIST_ARRAY",
"DATA_TYPE_BOOLEAN_VALUE",
"DATA_TYPE_INT8",
"DATA_TYPE_UINT8",
"DATA_TYPE_BOOLEAN_ARRAY",
"DATA_TYPE_INT8_ARRAY",
"DATA_TYPE_UINT8_ARRAY"
};
unsigned int i, j;
const unsigned char *p, *pair;
int junk;
int encoded_size, decoded_size;
p = nvlist;
xdr_int(&p, &junk);
xdr_int(&p, &junk);
pair = p;
xdr_int(&p, &encoded_size);
xdr_int(&p, &decoded_size);
while (encoded_size && decoded_size) {
int namelen, pairtype, elements;
const char *pairname;
xdr_int(&p, &namelen);
pairname = (const char*) p;
p += roundup(namelen, 4);
xdr_int(&p, &pairtype);
for (i = 0; i < indent; i++)
printf(" ");
printf("%s %s", typenames[pairtype], pairname);
xdr_int(&p, &elements);
switch (pairtype) {
case DATA_TYPE_UINT64: {
uint64_t val;
xdr_uint64_t(&p, &val);
printf(" = 0x%jx\n", (uintmax_t)val);
break;
}
case DATA_TYPE_STRING: {
int len;
xdr_int(&p, &len);
printf(" = \"%s\"\n", p);
break;
}
case DATA_TYPE_NVLIST:
printf("\n");
nvlist_print(p, indent + 1);
break;
case DATA_TYPE_NVLIST_ARRAY:
for (j = 0; j < elements; j++) {
printf("[%d]\n", j);
p = nvlist_print(p, indent + 1);
if (j != elements - 1) {
for (i = 0; i < indent; i++)
printf(" ");
printf("%s %s", typenames[pairtype], pairname);
}
}
break;
default:
printf("\n");
}
p = pair + encoded_size;
pair = p;
xdr_int(&p, &encoded_size);
xdr_int(&p, &decoded_size);
}
return p;
}
#endif
static int
vdev_read_phys(vdev_t *vdev, const blkptr_t *bp, void *buf,
off_t offset, size_t size)
{
size_t psize;
int rc;
if (!vdev->v_phys_read)
return (EIO);
if (bp) {
psize = BP_GET_PSIZE(bp);
} else {
psize = size;
}
/*printf("ZFS: reading %d bytes at 0x%jx to %p\n", psize, (uintmax_t)offset, buf);*/
rc = vdev->v_phys_read(vdev, vdev->v_read_priv, offset, buf, psize);
if (rc)
return (rc);
if (bp && zio_checksum_verify(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;
rc = EIO;
STAILQ_FOREACH(kid, &vdev->v_children, v_childlink) {
if (kid->v_state != VDEV_STATE_HEALTHY)
continue;
rc = kid->v_read(kid, bp, buf, offset, bytes);
if (!rc)
return (0);
}
return (rc);
}
static int
vdev_replacing_read(vdev_t *vdev, const blkptr_t *bp, void *buf,
off_t offset, size_t bytes)
{
vdev_t *kid;
/*
* Here we should have two kids:
* First one which is the one we are replacing and we can trust
* only this one to have valid data, but it might not be present.
* Second one is that one we are replacing with. It is most likely
* healthy, but we can't trust it has needed data, so we won't use it.
*/
kid = STAILQ_FIRST(&vdev->v_children);
if (kid == NULL)
return (EIO);
if (kid->v_state != VDEV_STATE_HEALTHY)
return (EIO);
return (kid->v_read(kid, bp, buf, offset, bytes));
}
static vdev_t *
vdev_find(uint64_t guid)
{
vdev_t *vdev;
STAILQ_FOREACH(vdev, &zfs_vdevs, v_alllink)
if (vdev->v_guid == guid)
return (vdev);
return (0);
}
static vdev_t *
vdev_create(uint64_t guid, vdev_read_t *read)
{
vdev_t *vdev;
vdev = malloc(sizeof(vdev_t));
memset(vdev, 0, sizeof(vdev_t));
STAILQ_INIT(&vdev->v_children);
vdev->v_guid = guid;
vdev->v_state = VDEV_STATE_OFFLINE;
vdev->v_read = read;
vdev->v_phys_read = 0;
vdev->v_read_priv = 0;
STAILQ_INSERT_TAIL(&zfs_vdevs, vdev, v_alllink);
return (vdev);
}
static int
vdev_init_from_nvlist(const unsigned char *nvlist, vdev_t *pvdev,
vdev_t **vdevp, int is_newer)
{
int rc;
uint64_t guid, id, ashift, nparity;
const char *type;
const char *path;
vdev_t *vdev, *kid;
const unsigned char *kids;
int nkids, i, is_new;
uint64_t is_offline, is_faulted, is_degraded, is_removed, isnt_present;
if (nvlist_find(nvlist, ZPOOL_CONFIG_GUID,
DATA_TYPE_UINT64, 0, &guid)
|| nvlist_find(nvlist, ZPOOL_CONFIG_ID,
DATA_TYPE_UINT64, 0, &id)
|| nvlist_find(nvlist, ZPOOL_CONFIG_TYPE,
DATA_TYPE_STRING, 0, &type)) {
printf("ZFS: can't find vdev details\n");
return (ENOENT);
}
if (strcmp(type, VDEV_TYPE_MIRROR)
&& strcmp(type, VDEV_TYPE_DISK)
#ifdef ZFS_TEST
&& strcmp(type, VDEV_TYPE_FILE)
#endif
&& strcmp(type, VDEV_TYPE_RAIDZ)
&& strcmp(type, VDEV_TYPE_REPLACING)) {
printf("ZFS: can only boot from disk, mirror, raidz1, raidz2 and raidz3 vdevs\n");
return (EIO);
}
is_offline = is_removed = is_faulted = is_degraded = isnt_present = 0;
nvlist_find(nvlist, ZPOOL_CONFIG_OFFLINE, DATA_TYPE_UINT64, 0,
&is_offline);
nvlist_find(nvlist, ZPOOL_CONFIG_REMOVED, DATA_TYPE_UINT64, 0,
&is_removed);
nvlist_find(nvlist, ZPOOL_CONFIG_FAULTED, DATA_TYPE_UINT64, 0,
&is_faulted);
nvlist_find(nvlist, ZPOOL_CONFIG_DEGRADED, DATA_TYPE_UINT64, 0,
&is_degraded);
nvlist_find(nvlist, ZPOOL_CONFIG_NOT_PRESENT, DATA_TYPE_UINT64, 0,
&isnt_present);
vdev = vdev_find(guid);
if (!vdev) {
is_new = 1;
if (!strcmp(type, VDEV_TYPE_MIRROR))
vdev = vdev_create(guid, vdev_mirror_read);
else if (!strcmp(type, VDEV_TYPE_RAIDZ))
vdev = vdev_create(guid, vdev_raidz_read);
else if (!strcmp(type, VDEV_TYPE_REPLACING))
vdev = vdev_create(guid, vdev_replacing_read);
else
vdev = vdev_create(guid, vdev_disk_read);
vdev->v_id = id;
vdev->v_top = pvdev != NULL ? pvdev : vdev;
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 (strncmp(path, "/dev/", 5) == 0)
path += 5;
vdev->v_name = strdup(path);
} else {
if (!strcmp(type, "raidz")) {
if (vdev->v_nparity == 1)
vdev->v_name = "raidz1";
else if (vdev->v_nparity == 2)
vdev->v_name = "raidz2";
else if (vdev->v_nparity == 3)
vdev->v_name = "raidz3";
else {
printf("ZFS: can only boot from disk, mirror, raidz1, raidz2 and raidz3 vdevs\n");
return (EIO);
}
} else {
vdev->v_name = strdup(type);
}
}
} else {
is_new = 0;
}
if (is_new || is_newer) {
/*
* This is either new vdev or we've already seen this vdev,
* but from an older vdev label, so let's refresh its state
* from the newer label.
*/
if (is_offline)
vdev->v_state = VDEV_STATE_OFFLINE;
else if (is_removed)
vdev->v_state = VDEV_STATE_REMOVED;
else if (is_faulted)
vdev->v_state = VDEV_STATE_FAULTED;
else if (is_degraded)
vdev->v_state = VDEV_STATE_DEGRADED;
else if (isnt_present)
vdev->v_state = VDEV_STATE_CANT_OPEN;
}
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, vdev, &kid, is_newer);
if (rc)
return (rc);
if (is_new)
STAILQ_INSERT_TAIL(&vdev->v_children, kid,
v_childlink);
kids = nvlist_next(kids);
}
} else {
vdev->v_nchildren = 0;
}
if (vdevp)
*vdevp = vdev;
return (0);
}
static void
vdev_set_state(vdev_t *vdev)
{
vdev_t *kid;
int good_kids;
int bad_kids;
/*
* 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;
STAILQ_FOREACH(kid, &vdev->v_children, v_childlink) {
if (kid->v_state == VDEV_STATE_HEALTHY)
good_kids++;
else
bad_kids++;
}
if (bad_kids == 0) {
vdev->v_state = VDEV_STATE_HEALTHY;
} else {
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;
}
}
}
}
}
static spa_t *
spa_find_by_guid(uint64_t guid)
{
spa_t *spa;
STAILQ_FOREACH(spa, &zfs_pools, spa_link)
if (spa->spa_guid == guid)
return (spa);
return (0);
}
static spa_t *
spa_find_by_name(const char *name)
{
spa_t *spa;
STAILQ_FOREACH(spa, &zfs_pools, spa_link)
if (!strcmp(spa->spa_name, name))
return (spa);
return (0);
}
#ifdef BOOT2
static spa_t *
spa_get_primary(void)
{
return (STAILQ_FIRST(&zfs_pools));
}
static vdev_t *
spa_get_primary_vdev(const spa_t *spa)
{
vdev_t *vdev;
vdev_t *kid;
if (spa == NULL)
spa = spa_get_primary();
if (spa == NULL)
return (NULL);
vdev = STAILQ_FIRST(&spa->spa_vdevs);
if (vdev == NULL)
return (NULL);
for (kid = STAILQ_FIRST(&vdev->v_children); kid != NULL;
kid = STAILQ_FIRST(&vdev->v_children))
vdev = kid;
return (vdev);
}
#endif
static spa_t *
spa_create(uint64_t guid)
{
spa_t *spa;
spa = malloc(sizeof(spa_t));
memset(spa, 0, sizeof(spa_t));
STAILQ_INIT(&spa->spa_vdevs);
spa->spa_guid = guid;
STAILQ_INSERT_TAIL(&zfs_pools, spa, spa_link);
return (spa);
}
static const char *
state_name(vdev_state_t state)
{
static const char* names[] = {
"UNKNOWN",
"CLOSED",
"OFFLINE",
"REMOVED",
"CANT_OPEN",
"FAULTED",
"DEGRADED",
"ONLINE"
};
return names[state];
}
#ifdef BOOT2
#define pager_printf printf
#else
static void
pager_printf(const char *fmt, ...)
{
char line[80];
va_list args;
va_start(args, fmt);
vsprintf(line, fmt, args);
va_end(args);
pager_output(line);
}
#endif
#define STATUS_FORMAT " %s %s\n"
static void
print_state(int indent, const char *name, vdev_state_t state)
{
int i;
char buf[512];
buf[0] = 0;
for (i = 0; i < indent; i++)
strcat(buf, " ");
strcat(buf, name);
pager_printf(STATUS_FORMAT, buf, state_name(state));
}
static void
vdev_status(vdev_t *vdev, int indent)
{
vdev_t *kid;
print_state(indent, vdev->v_name, vdev->v_state);
STAILQ_FOREACH(kid, &vdev->v_children, v_childlink) {
vdev_status(kid, indent + 1);
}
}
static void
spa_status(spa_t *spa)
{
static char bootfs[ZFS_MAXNAMELEN];
uint64_t rootid;
vdev_t *vdev;
int good_kids, bad_kids, degraded_kids;
vdev_state_t state;
pager_printf(" pool: %s\n", spa->spa_name);
if (zfs_get_root(spa, &rootid) == 0 &&
zfs_rlookup(spa, rootid, bootfs) == 0) {
if (bootfs[0] == '\0')
pager_printf("bootfs: %s\n", spa->spa_name);
else
pager_printf("bootfs: %s/%s\n", spa->spa_name, bootfs);
}
pager_printf("config:\n\n");
pager_printf(STATUS_FORMAT, "NAME", "STATE");
good_kids = 0;
degraded_kids = 0;
bad_kids = 0;
STAILQ_FOREACH(vdev, &spa->spa_vdevs, v_childlink) {
if (vdev->v_state == VDEV_STATE_HEALTHY)
good_kids++;
else if (vdev->v_state == VDEV_STATE_DEGRADED)
degraded_kids++;
else
bad_kids++;
}
state = VDEV_STATE_CLOSED;
if (good_kids > 0 && (degraded_kids + bad_kids) == 0)
state = VDEV_STATE_HEALTHY;
else if ((good_kids + degraded_kids) > 0)
state = VDEV_STATE_DEGRADED;
print_state(0, spa->spa_name, state);
STAILQ_FOREACH(vdev, &spa->spa_vdevs, v_childlink) {
vdev_status(vdev, 1);
}
}
static void
spa_all_status(void)
{
spa_t *spa;
int first = 1;
STAILQ_FOREACH(spa, &zfs_pools, spa_link) {
if (!first)
pager_printf("\n");
first = 0;
spa_status(spa);
}
}
static int
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;
spa_t *spa;
vdev_t *vdev, *top_vdev, *pool_vdev;
off_t off;
blkptr_t bp;
const unsigned char *nvlist;
uint64_t val;
uint64_t guid;
uint64_t pool_txg, pool_guid;
uint64_t is_log;
const char *pool_name;
const unsigned char *vdevs;
const unsigned char *features;
int i, rc, is_newer;
char *upbuf;
const struct uberblock *up;
/*
* Load the vdev label and figure out which
* uberblock is most current.
*/
memset(&vtmp, 0, sizeof(vtmp));
vtmp.v_phys_read = read;
vtmp.v_read_priv = read_priv;
off = offsetof(vdev_label_t, vl_vdev_phys);
BP_ZERO(&bp);
BP_SET_LSIZE(&bp, sizeof(vdev_phys_t));
BP_SET_PSIZE(&bp, sizeof(vdev_phys_t));
BP_SET_CHECKSUM(&bp, ZIO_CHECKSUM_LABEL);
BP_SET_COMPRESS(&bp, ZIO_COMPRESS_OFF);
DVA_SET_OFFSET(BP_IDENTITY(&bp), off);
ZIO_SET_CHECKSUM(&bp.blk_cksum, off, 0, 0, 0);
if (vdev_read_phys(&vtmp, &bp, vdev_label, off, 0))
return (EIO);
if (vdev_label->vp_nvlist[0] != NV_ENCODE_XDR) {
return (EIO);
}
nvlist = (const unsigned char *) vdev_label->vp_nvlist + 4;
if (nvlist_find(nvlist,
ZPOOL_CONFIG_VERSION,
DATA_TYPE_UINT64, 0, &val)) {
return (EIO);
}
if (!SPA_VERSION_IS_SUPPORTED(val)) {
printf("ZFS: unsupported ZFS version %u (should be %u)\n",
(unsigned) val, (unsigned) SPA_VERSION);
return (EIO);
}
/* Check ZFS features for read */
if (nvlist_find(nvlist,
ZPOOL_CONFIG_FEATURES_FOR_READ,
DATA_TYPE_NVLIST, 0, &features) == 0
&& nvlist_check_features_for_read(features) != 0) {
//unsupported flags are maybe not too bad
if (opt_ignore_errors == 0) {
return (EIO);
}
}
if (nvlist_find(nvlist,
ZPOOL_CONFIG_POOL_STATE,
DATA_TYPE_UINT64, 0, &val)) {
return (EIO);
}
if (val == POOL_STATE_DESTROYED) {
/* We don't boot only from destroyed pools. */
return (EIO);
}
if (nvlist_find(nvlist,
ZPOOL_CONFIG_POOL_TXG,
DATA_TYPE_UINT64, 0, &pool_txg)
|| nvlist_find(nvlist,
ZPOOL_CONFIG_POOL_GUID,
DATA_TYPE_UINT64, 0, &pool_guid)
|| nvlist_find(nvlist,
ZPOOL_CONFIG_POOL_NAME,
DATA_TYPE_STRING, 0, &pool_name)) {
/*
* Cache and spare devices end up here - just ignore
* them.
*/
/*printf("ZFS: can't find pool details\n");*/
return (EIO);
}
is_log = 0;
(void) nvlist_find(nvlist, ZPOOL_CONFIG_IS_LOG, DATA_TYPE_UINT64, 0,
&is_log);
if (is_log)
return (EIO);
/*
* Create the pool if this is the first time we've seen it.
*/
spa = spa_find_by_guid(pool_guid);
if (!spa) {
spa = spa_create(pool_guid);
spa->spa_name = strdup(pool_name);
}
if (pool_txg > spa->spa_txg) {
spa->spa_txg = pool_txg;
is_newer = 1;
} else
is_newer = 0;
/*
* Get the vdev tree and create our in-core copy of it.
* If we already have a vdev with this guid, this must
* be some kind of alias (overlapping slices, dangerously dedicated
* disks etc).
*/
if (nvlist_find(nvlist,
ZPOOL_CONFIG_GUID,
DATA_TYPE_UINT64, 0, &guid)) {
return (EIO);
}
vdev = vdev_find(guid);