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81fdf04870
freebsd-dev/sys/boot/zfs/zfsimpl.c
Pawel Jakub Dawidek 81fdf04870 Always pass data size for checksum verification function, as using 
physical block size declared in bp may not always be what we want.
For example in case of gang block header physical block size declared
in bp is much larger than SPA_GANGBLOCKSIZE (512 bytes) and checksum
calculation failed. This bug could lead to accessing unallocated
memory and resets/failures during boot.

MFC after:	3 days
2011-10-19 23:44:38 +00:00

1709 lines
37 KiB
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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("$FreeBSD$");
/*
* Stand-alone ZFS file reader.
*/
#include <sys/stat.h>
#include "zfsimpl.h"
#include "zfssubr.c"
/*
* List of all vdevs, chained through v_alllink.
*/
static vdev_list_t zfs_vdevs;
/*
* 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(spa_t *spa, const blkptr_t *bp, void *buf);
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);
}
/*
* 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%llx\n", 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%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_verify(bp, buf, offset, psize))
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)
&& 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);
}
#ifdef BOOT2
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);
}
#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)
{
vdev_t *vdev;
int good_kids, bad_kids, degraded_kids;
vdev_state_t state;
pager_printf(" pool: %s\n", spa->spa_name);
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;
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);
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 (val > SPA_VERSION) {
printf("ZFS: unsupported ZFS version %u (should be %u)\n",
(unsigned) val, (unsigned) SPA_VERSION);
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);
if (vdev && vdev->v_phys_read) /* Has this vdev already been inited? */
return (EIO);
if (nvlist_find(nvlist,
ZPOOL_CONFIG_VDEV_TREE,
DATA_TYPE_NVLIST, 0, &vdevs)) {
return (EIO);
}
rc = vdev_init_from_nvlist(vdevs, NULL, &top_vdev, is_newer);
if (rc)
return (rc);
/*
* Add the toplevel vdev to the pool if its not already there.
*/
STAILQ_FOREACH(pool_vdev, &spa->spa_vdevs, v_childlink)
if (top_vdev == pool_vdev)
break;
if (!pool_vdev && top_vdev)
STAILQ_INSERT_TAIL(&spa->spa_vdevs, top_vdev, v_childlink);
/*
* We should already have created an incomplete vdev for this
* vdev. Find it and initialise it with our read proc.
*/
vdev = vdev_find(guid);
if (vdev) {
vdev->v_phys_read = read;
vdev->v_read_priv = read_priv;
vdev->v_state = VDEV_STATE_HEALTHY;
} else {
printf("ZFS: inconsistent nvlist contents\n");
return (EIO);
}
/*
* Re-evaluate top-level vdev state.
*/
vdev_set_state(top_vdev);
/*
* Ok, we are happy with the pool so far. Lets find
* the best uberblock and then we can actually access
* the contents of the pool.
*/
upbuf = zfs_alloc(VDEV_UBERBLOCK_SIZE(vdev));
up = (const struct uberblock *)upbuf;
for (i = 0;
i < VDEV_UBERBLOCK_COUNT(vdev);
i++) {
off = VDEV_UBERBLOCK_OFFSET(vdev, i);
BP_ZERO(&bp);
DVA_SET_OFFSET(&bp.blk_dva[0], off);
BP_SET_LSIZE(&bp, VDEV_UBERBLOCK_SIZE(vdev));
BP_SET_PSIZE(&bp, VDEV_UBERBLOCK_SIZE(vdev));
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 (vdev_read_phys(vdev, NULL, upbuf, off, VDEV_UBERBLOCK_SIZE(vdev)))
continue;
if (up->ub_magic != UBERBLOCK_MAGIC)
continue;
if (up->ub_txg < spa->spa_txg)
continue;
if (up->ub_txg > spa->spa_uberblock.ub_txg) {
spa->spa_uberblock = *up;
} else if (up->ub_txg == spa->spa_uberblock.ub_txg) {
if (up->ub_timestamp > spa->spa_uberblock.ub_timestamp)
spa->spa_uberblock = *up;
}
}
zfs_free(upbuf, VDEV_UBERBLOCK_SIZE(vdev));
if (spap)
*spap = spa;
return (0);
}
static int
ilog2(int n)
{
int v;
for (v = 0; v < 32; v++)
if (n == (1 << v))
return v;
return -1;
}
static int
zio_read_gang(spa_t *spa, const blkptr_t *bp, const dva_t *dva, void *buf)
{
zio_gbh_phys_t zio_gb;
vdev_t *vdev;
int vdevid;
off_t offset;
int i;
vdevid = DVA_GET_VDEV(dva);
offset = DVA_GET_OFFSET(dva);
STAILQ_FOREACH(vdev, &spa->spa_vdevs, v_childlink)
if (vdev->v_id == vdevid)
break;
if (!vdev || !vdev->v_read)
return (EIO);
if (vdev->v_read(vdev, bp, &zio_gb, offset, SPA_GANGBLOCKSIZE))
return (EIO);
for (i = 0; i < SPA_GBH_NBLKPTRS; i++) {
blkptr_t *gbp = &zio_gb.zg_blkptr[i];
if (BP_IS_HOLE(gbp))
continue;
if (zio_read(spa, gbp, buf))
return (EIO);
buf = (char*)buf + BP_GET_PSIZE(gbp);
}
return (0);
}
static int
zio_read(spa_t *spa, const blkptr_t *bp, void *buf)
{
int cpfunc = BP_GET_COMPRESS(bp);
uint64_t align, size;
void *pbuf;
int i, error;
error = EIO;
for (i = 0; i < SPA_DVAS_PER_BP; i++) {
const dva_t *dva = &bp->blk_dva[i];
vdev_t *vdev;
int vdevid;
off_t offset;
if (!dva->dva_word[0] && !dva->dva_word[1])
continue;
if (DVA_GET_GANG(dva)) {
error = zio_read_gang(spa, bp, dva, buf);
if (error != 0)
continue;
} else {
vdevid = DVA_GET_VDEV(dva);
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;
size = BP_GET_PSIZE(bp);
align = 1ULL << vdev->v_top->v_ashift;
if (P2PHASE(size, align) != 0)
size = P2ROUNDUP(size, align);
if (size != BP_GET_PSIZE(bp) || cpfunc != ZIO_COMPRESS_OFF)
pbuf = zfs_alloc(size);
else
pbuf = buf;
error = vdev->v_read(vdev, bp, pbuf, offset, size);
if (error == 0) {
if (cpfunc != ZIO_COMPRESS_OFF) {
error = zio_decompress_data(cpfunc,
pbuf, BP_GET_PSIZE(bp), buf,
BP_GET_LSIZE(bp));
} else if (size != BP_GET_PSIZE(bp)) {
bcopy(pbuf, buf, BP_GET_PSIZE(bp));
}
}
if (buf != pbuf)
zfs_free(pbuf, size);
if (error != 0)
continue;
}
error = 0;
break;
}
if (error != 0)
printf("ZFS: i/o error - all block copies unavailable\n");
return (error);
}
static int
dnode_read(spa_t *spa, const dnode_phys_t *dnode, off_t offset, void *buf, size_t buflen)
{
int ibshift = dnode->dn_indblkshift - SPA_BLKPTRSHIFT;
int bsize = dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT;
int nlevels = dnode->dn_nlevels;
int i, rc;
/*
* Note: bsize may not be a power of two here so we need to do an
* actual divide rather than a bitshift.
*/
while (buflen > 0) {
uint64_t bn = offset / bsize;
int boff = offset % bsize;
int ibn;
const blkptr_t *indbp;
blkptr_t bp;
if (bn > dnode->dn_maxblkid)
return (EIO);
if (dnode == dnode_cache_obj && bn == dnode_cache_bn)
goto cached;
indbp = dnode->dn_blkptr;
for (i = 0; i < nlevels; i++) {
/*
* Copy the bp from the indirect array so that
* we can re-use the scratch buffer for multi-level
* objects.
*/
ibn = bn >> ((nlevels - i - 1) * ibshift);
ibn &= ((1 << ibshift) - 1);
bp = indbp[ibn];
rc = zio_read(spa, &bp, dnode_cache_buf);
if (rc)
return (rc);
indbp = (const blkptr_t *) dnode_cache_buf;
}
dnode_cache_obj = dnode;
dnode_cache_bn = bn;
cached:
/*
* The buffer contains our data block. Copy what we
* need from it and loop.
*/
i = bsize - boff;
if (i > buflen) i = buflen;
memcpy(buf, &dnode_cache_buf[boff], i);
buf = ((char*) buf) + i;
offset += i;
buflen -= i;
}
return (0);
}
/*
* Lookup a value in a microzap directory. Assumes that the zap
* scratch buffer contains the directory contents.
*/
static int
mzap_lookup(spa_t *spa, const dnode_phys_t *dnode, const char *name, uint64_t *value)
{
const mzap_phys_t *mz;
const mzap_ent_phys_t *mze;
size_t size;
int chunks, i;
/*
* Microzap objects use exactly one block. Read the whole
* thing.
*/
size = dnode->dn_datablkszsec * 512;
mz = (const mzap_phys_t *) zap_scratch;
chunks = size / MZAP_ENT_LEN - 1;
for (i = 0; i < chunks; i++) {
mze = &mz->mz_chunk[i];
if (!strcmp(mze->mze_name, name)) {
*value = mze->mze_value;
return (0);
}
}
return (ENOENT);
}
/*
* Compare a name with a zap leaf entry. Return non-zero if the name
* matches.
*/
static int
fzap_name_equal(const zap_leaf_t *zl, const zap_leaf_chunk_t *zc, const char *name)
{
size_t namelen;
const zap_leaf_chunk_t *nc;
const char *p;
namelen = zc->l_entry.le_name_length;
nc = &ZAP_LEAF_CHUNK(zl, zc->l_entry.le_name_chunk);
p = name;
while (namelen > 0) {
size_t len;
len = namelen;
if (len > ZAP_LEAF_ARRAY_BYTES)
len = ZAP_LEAF_ARRAY_BYTES;
if (memcmp(p, nc->l_array.la_array, len))
return (0);
p += len;
namelen -= len;
nc = &ZAP_LEAF_CHUNK(zl, nc->l_array.la_next);
}
return 1;
}
/*
* Extract a uint64_t value from a zap leaf entry.
*/
static uint64_t
fzap_leaf_value(const zap_leaf_t *zl, const zap_leaf_chunk_t *zc)
{
const zap_leaf_chunk_t *vc;
int i;
uint64_t value;
const uint8_t *p;
vc = &ZAP_LEAF_CHUNK(zl, zc->l_entry.le_value_chunk);
for (i = 0, value = 0, p = vc->l_array.la_array; i < 8; i++) {
value = (value << 8) | p[i];
}
return value;
}
/*
* Lookup a value in a fatzap directory. Assumes that the zap scratch
* buffer contains the directory header.
*/
static int
fzap_lookup(spa_t *spa, const dnode_phys_t *dnode, const char *name, uint64_t *value)
{
int bsize = dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT;
zap_phys_t zh = *(zap_phys_t *) zap_scratch;
fat_zap_t z;
uint64_t *ptrtbl;
uint64_t hash;
int rc;
if (zh.zap_magic != ZAP_MAGIC)
return (EIO);
z.zap_block_shift = ilog2(bsize);
z.zap_phys = (zap_phys_t *) zap_scratch;
/*
* Figure out where the pointer table is and read it in if necessary.
*/
if (zh.zap_ptrtbl.zt_blk) {
rc = dnode_read(spa, dnode, zh.zap_ptrtbl.zt_blk * bsize,
zap_scratch, bsize);
if (rc)
return (rc);
ptrtbl = (uint64_t *) zap_scratch;
} else {
ptrtbl = &ZAP_EMBEDDED_PTRTBL_ENT(&z, 0);
}
hash = zap_hash(zh.zap_salt, name);
zap_leaf_t zl;
zl.l_bs = z.zap_block_shift;
off_t off = ptrtbl[hash >> (64 - zh.zap_ptrtbl.zt_shift)] << zl.l_bs;
zap_leaf_chunk_t *zc;
rc = dnode_read(spa, dnode, off, zap_scratch, bsize);
if (rc)
return (rc);
zl.l_phys = (zap_leaf_phys_t *) zap_scratch;
/*
* Make sure this chunk matches our hash.
*/
if (zl.l_phys->l_hdr.lh_prefix_len > 0
&& zl.l_phys->l_hdr.lh_prefix
!= hash >> (64 - zl.l_phys->l_hdr.lh_prefix_len))
return (ENOENT);
/*
* Hash within the chunk to find our entry.
*/
int shift = (64 - ZAP_LEAF_HASH_SHIFT(&zl) - zl.l_phys->l_hdr.lh_prefix_len);
int h = (hash >> shift) & ((1 << ZAP_LEAF_HASH_SHIFT(&zl)) - 1);
h = zl.l_phys->l_hash[h];
if (h == 0xffff)
return (ENOENT);
zc = &ZAP_LEAF_CHUNK(&zl, h);
while (zc->l_entry.le_hash != hash) {
if (zc->l_entry.le_next == 0xffff) {
zc = 0;
break;
}
zc = &ZAP_LEAF_CHUNK(&zl, zc->l_entry.le_next);
}
if (fzap_name_equal(&zl, zc, name)) {
*value = fzap_leaf_value(&zl, zc);
return (0);
}
return (ENOENT);
}
/*
* Lookup a name in a zap object and return its value as a uint64_t.
*/
static int
zap_lookup(spa_t *spa, const dnode_phys_t *dnode, const char *name, uint64_t *value)
{
int rc;
uint64_t zap_type;
size_t size = dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT;
rc = dnode_read(spa, dnode, 0, zap_scratch, size);
if (rc)
return (rc);
zap_type = *(uint64_t *) zap_scratch;
if (zap_type == ZBT_MICRO)
return mzap_lookup(spa, dnode, name, value);
else if (zap_type == ZBT_HEADER)
return fzap_lookup(spa, dnode, name, value);
printf("ZFS: invalid zap_type=%d\n", (int)zap_type);
return (EIO);
}
#ifdef BOOT2
/*
* List a microzap directory. Assumes that the zap scratch buffer contains
* the directory contents.
*/
static int
mzap_list(spa_t *spa, const dnode_phys_t *dnode)
{
const mzap_phys_t *mz;
const mzap_ent_phys_t *mze;
size_t size;
int chunks, i;
/*
* Microzap objects use exactly one block. Read the whole
* thing.
*/
size = dnode->dn_datablkszsec * 512;
mz = (const mzap_phys_t *) zap_scratch;
chunks = size / MZAP_ENT_LEN - 1;
for (i = 0; i < chunks; i++) {
mze = &mz->mz_chunk[i];
if (mze->mze_name[0])
//printf("%-32s 0x%llx\n", mze->mze_name, mze->mze_value);
printf("%s\n", mze->mze_name);
}
return (0);
}
/*
* List a fatzap directory. Assumes that the zap scratch buffer contains
* the directory header.
*/
static int
fzap_list(spa_t *spa, const dnode_phys_t *dnode)
{
int bsize = dnode->dn_datablkszsec << SPA_MINBLOCKSHIFT;
zap_phys_t zh = *(zap_phys_t *) zap_scratch;
fat_zap_t z;
int i, j;
if (zh.zap_magic != ZAP_MAGIC)
return (EIO);
z.zap_block_shift = ilog2(bsize);
z.zap_phys = (zap_phys_t *) zap_scratch;
/*
* This assumes that the leaf blocks start at block 1. The
* documentation isn't exactly clear on this.
*/
zap_leaf_t zl;
zl.l_bs = z.zap_block_shift;
for (i = 0; i < zh.zap_num_leafs; i++) {
off_t off = (i + 1) << zl.l_bs;
char name[256], *p;
uint64_t value;
if (dnode_read(spa, dnode, off, zap_scratch, bsize))
return (EIO);
zl.l_phys = (zap_leaf_phys_t *) zap_scratch;
for (j = 0; j < ZAP_LEAF_NUMCHUNKS(&zl); j++) {
zap_leaf_chunk_t *zc, *nc;
int namelen;
zc = &ZAP_LEAF_CHUNK(&zl, j);
if (zc->l_entry.le_type != ZAP_CHUNK_ENTRY)
continue;
namelen = zc->l_entry.le_name_length;
if (namelen > sizeof(name))
namelen = sizeof(name);
/*
* Paste the name back together.
*/
nc = &ZAP_LEAF_CHUNK(&zl, zc->l_entry.le_name_chunk);
p = name;
while (namelen > 0) {
int len;
len = namelen;
if (len > ZAP_LEAF_ARRAY_BYTES)
len = ZAP_LEAF_ARRAY_BYTES;
memcpy(p, nc->l_array.la_array, len);
p += len;
namelen -= len;
nc = &ZAP_LEAF_CHUNK(&zl, nc->l_array.la_next);
}
/*
* Assume the first eight bytes of the value are
* a uint64_t.
*/
value = fzap_leaf_value(&zl, zc);
printf("%s 0x%llx\n", name, value);
}
}
return (0);
}
/*
* List a zap directory.
*/
static int
zap_list(spa_t *spa, const dnode_phys_t *dnode)
{
uint64_t zap_type;
size_t size = dnode->dn_datablkszsec * 512;
if (dnode_read(spa, dnode, 0, zap_scratch, size))
return (EIO);
zap_type = *(uint64_t *) zap_scratch;
if (zap_type == ZBT_MICRO)
return mzap_list(spa, dnode);
else
return fzap_list(spa, dnode);
}
#endif
static int
objset_get_dnode(spa_t *spa, const objset_phys_t *os, uint64_t objnum, dnode_phys_t *dnode)
{
off_t offset;
offset = objnum * sizeof(dnode_phys_t);
return dnode_read(spa, &os->os_meta_dnode, offset,
dnode, sizeof(dnode_phys_t));
}
/*
* Find the object set given the object number of its dataset object
* and return its details in *objset
*/
static int
zfs_mount_dataset(spa_t *spa, uint64_t objnum, objset_phys_t *objset)
{
dnode_phys_t dataset;
dsl_dataset_phys_t *ds;
if (objset_get_dnode(spa, &spa->spa_mos, objnum, &dataset)) {
printf("ZFS: can't find dataset %llu\n", objnum);
return (EIO);
}
ds = (dsl_dataset_phys_t *) &dataset.dn_bonus;
if (zio_read(spa, &ds->ds_bp, objset)) {
printf("ZFS: can't read object set for dataset %llu\n", objnum);
return (EIO);
}
return (0);
}
/*
* Find the object set pointed to by the BOOTFS property or the root
* dataset if there is none and return its details in *objset
*/
static int
zfs_mount_root(spa_t *spa, objset_phys_t *objset)
{
dnode_phys_t dir, propdir;
uint64_t props, bootfs, root;
/*
* Start with the MOS directory object.
*/
if (objset_get_dnode(spa, &spa->spa_mos, DMU_POOL_DIRECTORY_OBJECT, &dir)) {
printf("ZFS: can't read MOS object directory\n");
return (EIO);
}
/*
* Lookup the pool_props and see if we can find a bootfs.
*/
if (zap_lookup(spa, &dir, DMU_POOL_PROPS, &props) == 0
&& objset_get_dnode(spa, &spa->spa_mos, props, &propdir) == 0
&& zap_lookup(spa, &propdir, "bootfs", &bootfs) == 0
&& bootfs != 0)
return zfs_mount_dataset(spa, bootfs, objset);
/*
* Lookup the root dataset directory
*/
if (zap_lookup(spa, &dir, DMU_POOL_ROOT_DATASET, &root)
|| objset_get_dnode(spa, &spa->spa_mos, root, &dir)) {
printf("ZFS: can't find root dsl_dir\n");
return (EIO);
}
/*
* Use the information from the dataset directory's bonus buffer
* to find the dataset object and from that the object set itself.
*/
dsl_dir_phys_t *dd = (dsl_dir_phys_t *) &dir.dn_bonus;
return zfs_mount_dataset(spa, dd->dd_head_dataset_obj, objset);
}
static int
zfs_mount_pool(spa_t *spa)
{
/*
* Find the MOS and work our way in from there.
*/
if (zio_read(spa, &spa->spa_uberblock.ub_rootbp, &spa->spa_mos)) {
printf("ZFS: can't read MOS\n");
return (EIO);
}
/*
* Find the root object set
*/
if (zfs_mount_root(spa, &spa->spa_root_objset)) {
printf("Can't find root filesystem - giving up\n");
return (EIO);
}
return (0);
}
static int
zfs_dnode_stat(spa_t *spa, dnode_phys_t *dn, struct stat *sb)
{
if (dn->dn_bonustype != DMU_OT_SA) {
znode_phys_t *zp = (znode_phys_t *)dn->dn_bonus;
sb->st_mode = zp->zp_mode;
sb->st_uid = zp->zp_uid;
sb->st_gid = zp->zp_gid;
sb->st_size = zp->zp_size;
} else {
sa_hdr_phys_t *sahdrp;
int hdrsize;
size_t size = 0;
void *buf = NULL;
if (dn->dn_bonuslen != 0)
sahdrp = (sa_hdr_phys_t *)DN_BONUS(dn);
else {
if ((dn->dn_flags & DNODE_FLAG_SPILL_BLKPTR) != 0) {
blkptr_t *bp = &dn->dn_spill;
int error;
size = BP_GET_LSIZE(bp);
buf = zfs_alloc(size);
error = zio_read(spa, bp, buf);
if (error != 0) {
zfs_free(buf, size);
return (error);
}
sahdrp = buf;
} else {
return (EIO);
}
}
hdrsize = SA_HDR_SIZE(sahdrp);
sb->st_mode = *(uint64_t *)((char *)sahdrp + hdrsize +
SA_MODE_OFFSET);
sb->st_uid = *(uint64_t *)((char *)sahdrp + hdrsize +
SA_UID_OFFSET);
sb->st_gid = *(uint64_t *)((char *)sahdrp + hdrsize +
SA_GID_OFFSET);
sb->st_size = *(uint64_t *)((char *)sahdrp + hdrsize +
SA_SIZE_OFFSET);
if (buf != NULL)
zfs_free(buf, size);
}
return (0);
}
/*
* Lookup a file and return its dnode.
*/
static int
zfs_lookup(spa_t *spa, const char *upath, dnode_phys_t *dnode)
{
int rc;
uint64_t objnum, rootnum, parentnum;
dnode_phys_t dn;
const char *p, *q;
char element[256];
char path[1024];
int symlinks_followed = 0;
struct stat sb;
if (spa->spa_root_objset.os_type != DMU_OST_ZFS) {
printf("ZFS: unexpected object set type %llu\n",
spa->spa_root_objset.os_type);
return (EIO);
}
/*
* Get the root directory dnode.
*/
rc = objset_get_dnode(spa, &spa->spa_root_objset, MASTER_NODE_OBJ, &dn);
if (rc)
return (rc);
rc = zap_lookup(spa, &dn, ZFS_ROOT_OBJ, &rootnum);
if (rc)
return (rc);
rc = objset_get_dnode(spa, &spa->spa_root_objset, rootnum, &dn);
if (rc)
return (rc);
objnum = rootnum;
p = upath;
while (p && *p) {
while (*p == '/')
p++;
if (!*p)
break;
q = strchr(p, '/');
if (q) {
memcpy(element, p, q - p);
element[q - p] = 0;
p = q;
} else {
strcpy(element, p);
p = 0;
}
rc = zfs_dnode_stat(spa, &dn, &sb);
if (rc)
return (rc);
if (!S_ISDIR(sb.st_mode))
return (ENOTDIR);
parentnum = objnum;
rc = zap_lookup(spa, &dn, element, &objnum);
if (rc)
return (rc);
objnum = ZFS_DIRENT_OBJ(objnum);
rc = objset_get_dnode(spa, &spa->spa_root_objset, objnum, &dn);
if (rc)
return (rc);
/*
* Check for symlink.
*/
rc = zfs_dnode_stat(spa, &dn, &sb);
if (rc)
return (rc);
if (S_ISLNK(sb.st_mode)) {
if (symlinks_followed > 10)
return (EMLINK);
symlinks_followed++;
/*
* Read the link value and copy the tail of our
* current path onto the end.
*/
if (p)
strcpy(&path[sb.st_size], p);
else
path[sb.st_size] = 0;
if (sb.st_size + sizeof(znode_phys_t) <= dn.dn_bonuslen) {
memcpy(path, &dn.dn_bonus[sizeof(znode_phys_t)],
sb.st_size);
} else {
rc = dnode_read(spa, &dn, 0, path, sb.st_size);
if (rc)
return (rc);
}
/*
* Restart with the new path, starting either at
* the root or at the parent depending whether or
* not the link is relative.
*/
p = path;
if (*p == '/')
objnum = rootnum;
else
objnum = parentnum;
objset_get_dnode(spa, &spa->spa_root_objset, objnum, &dn);
}
}
*dnode = dn;
return (0);
}
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