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zfs.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.
*
* $FreeBSD$
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* Stand-alone file reading package.
*/
#include <stand.h>
#include <sys/disk.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/queue.h>
#include <disk.h>
#include <part.h>
#include <stddef.h>
#include <stdarg.h>
#include <string.h>
#include <bootstrap.h>
#include "libzfs.h"
#include "zfsimpl.c"
/* Define the range of indexes to be populated with ZFS Boot Environments */
#define ZFS_BE_FIRST 4
#define ZFS_BE_LAST 8
static int zfs_open(const char *path, struct open_file *f);
static int zfs_close(struct open_file *f);
static int zfs_read(struct open_file *f, void *buf, size_t size, size_t *resid);
static off_t zfs_seek(struct open_file *f, off_t offset, int where);
static int zfs_stat(struct open_file *f, struct stat *sb);
static int zfs_readdir(struct open_file *f, struct dirent *d);
static void zfs_bootenv_initial(const char *envname, spa_t *spa,
const char *name, const char *dsname, int checkpoint);
static void zfs_checkpoints_initial(spa_t *spa, const char *name,
const char *dsname);
struct devsw zfs_dev;
struct fs_ops zfs_fsops = {
"zfs",
zfs_open,
zfs_close,
zfs_read,
null_write,
zfs_seek,
zfs_stat,
zfs_readdir
};
/*
* In-core open file.
*/
struct file {
off_t f_seekp; /* seek pointer */
dnode_phys_t f_dnode;
uint64_t f_zap_type; /* zap type for readdir */
uint64_t f_num_leafs; /* number of fzap leaf blocks */
zap_leaf_phys_t *f_zap_leaf; /* zap leaf buffer */
};
static int zfs_env_index;
static int zfs_env_count;
SLIST_HEAD(zfs_be_list, zfs_be_entry) zfs_be_head = SLIST_HEAD_INITIALIZER(zfs_be_head);
struct zfs_be_list *zfs_be_headp;
struct zfs_be_entry {
char *name;
SLIST_ENTRY(zfs_be_entry) entries;
} *zfs_be, *zfs_be_tmp;
/*
* Open a file.
*/
static int
zfs_open(const char *upath, struct open_file *f)
{
struct zfsmount *mount = (struct zfsmount *)f->f_devdata;
struct file *fp;
int rc;
if (f->f_dev != &zfs_dev)
return (EINVAL);
/* allocate file system specific data structure */
fp = calloc(1, sizeof(struct file));
if (fp == NULL)
return (ENOMEM);
f->f_fsdata = fp;
rc = zfs_lookup(mount, upath, &fp->f_dnode);
fp->f_seekp = 0;
if (rc) {
f->f_fsdata = NULL;
free(fp);
}
return (rc);
}
static int
zfs_close(struct open_file *f)
{
struct file *fp = (struct file *)f->f_fsdata;
dnode_cache_obj = NULL;
f->f_fsdata = NULL;
free(fp);
return (0);
}
/*
* Copy a portion of a file into kernel memory.
* Cross block boundaries when necessary.
*/
static int
zfs_read(struct open_file *f, void *start, size_t size, size_t *resid /* out */)
{
const spa_t *spa = ((struct zfsmount *)f->f_devdata)->spa;
struct file *fp = (struct file *)f->f_fsdata;
struct stat sb;
size_t n;
int rc;
rc = zfs_stat(f, &sb);
if (rc)
return (rc);
n = size;
if (fp->f_seekp + n > sb.st_size)
n = sb.st_size - fp->f_seekp;
rc = dnode_read(spa, &fp->f_dnode, fp->f_seekp, start, n);
if (rc)
return (rc);
if (0) {
int i;
for (i = 0; i < n; i++)
putchar(((char*) start)[i]);
}
fp->f_seekp += n;
if (resid)
*resid = size - n;
return (0);
}
static off_t
zfs_seek(struct open_file *f, off_t offset, int where)
{
struct file *fp = (struct file *)f->f_fsdata;
switch (where) {
case SEEK_SET:
fp->f_seekp = offset;
break;
case SEEK_CUR:
fp->f_seekp += offset;
break;
case SEEK_END:
{
struct stat sb;
int error;
error = zfs_stat(f, &sb);
if (error != 0) {
errno = error;
return (-1);
}
fp->f_seekp = sb.st_size - offset;
break;
}
default:
errno = EINVAL;
return (-1);
}
return (fp->f_seekp);
}
static int
zfs_stat(struct open_file *f, struct stat *sb)
{
const spa_t *spa = ((struct zfsmount *)f->f_devdata)->spa;
struct file *fp = (struct file *)f->f_fsdata;
return (zfs_dnode_stat(spa, &fp->f_dnode, sb));
}
static int
zfs_readdir(struct open_file *f, struct dirent *d)
{
const spa_t *spa = ((struct zfsmount *)f->f_devdata)->spa;
struct file *fp = (struct file *)f->f_fsdata;
mzap_ent_phys_t mze;
struct stat sb;
size_t bsize = fp->f_dnode.dn_datablkszsec << SPA_MINBLOCKSHIFT;
int rc;
rc = zfs_stat(f, &sb);
if (rc)
return (rc);
if (!S_ISDIR(sb.st_mode))
return (ENOTDIR);
/*
* If this is the first read, get the zap type.
*/
if (fp->f_seekp == 0) {
rc = dnode_read(spa, &fp->f_dnode,
0, &fp->f_zap_type, sizeof(fp->f_zap_type));
if (rc)
return (rc);
if (fp->f_zap_type == ZBT_MICRO) {
fp->f_seekp = offsetof(mzap_phys_t, mz_chunk);
} else {
rc = dnode_read(spa, &fp->f_dnode,
offsetof(zap_phys_t, zap_num_leafs),
&fp->f_num_leafs,
sizeof(fp->f_num_leafs));
if (rc)
return (rc);
fp->f_seekp = bsize;
fp->f_zap_leaf = malloc(bsize);
if (fp->f_zap_leaf == NULL)
return (ENOMEM);
rc = dnode_read(spa, &fp->f_dnode,
fp->f_seekp,
fp->f_zap_leaf,
bsize);
if (rc)
return (rc);
}
}
if (fp->f_zap_type == ZBT_MICRO) {
mzap_next:
if (fp->f_seekp >= bsize)
return (ENOENT);
rc = dnode_read(spa, &fp->f_dnode,
fp->f_seekp, &mze, sizeof(mze));
if (rc)
return (rc);
fp->f_seekp += sizeof(mze);
if (!mze.mze_name[0])
goto mzap_next;
d->d_fileno = ZFS_DIRENT_OBJ(mze.mze_value);
d->d_type = ZFS_DIRENT_TYPE(mze.mze_value);
strcpy(d->d_name, mze.mze_name);
d->d_namlen = strlen(d->d_name);
return (0);
} else {
zap_leaf_t zl;
zap_leaf_chunk_t *zc, *nc;
int chunk;
size_t namelen;
char *p;
uint64_t value;
/*
* Initialise this so we can use the ZAP size
* calculating macros.
*/
zl.l_bs = ilog2(bsize);
zl.l_phys = fp->f_zap_leaf;
/*
* Figure out which chunk we are currently looking at
* and consider seeking to the next leaf. We use the
* low bits of f_seekp as a simple chunk index.
*/
fzap_next:
chunk = fp->f_seekp & (bsize - 1);
if (chunk == ZAP_LEAF_NUMCHUNKS(&zl)) {
fp->f_seekp = rounddown2(fp->f_seekp, bsize) + bsize;
chunk = 0;
/*
* Check for EOF and read the new leaf.
*/
if (fp->f_seekp >= bsize * fp->f_num_leafs)
return (ENOENT);
rc = dnode_read(spa, &fp->f_dnode,
fp->f_seekp,
fp->f_zap_leaf,
bsize);
if (rc)
return (rc);
}
zc = &ZAP_LEAF_CHUNK(&zl, chunk);
fp->f_seekp++;
if (zc->l_entry.le_type != ZAP_CHUNK_ENTRY)
goto fzap_next;
namelen = zc->l_entry.le_name_numints;
if (namelen > sizeof(d->d_name))
namelen = sizeof(d->d_name);
/*
* Paste the name back together.
*/
nc = &ZAP_LEAF_CHUNK(&zl, zc->l_entry.le_name_chunk);
p = d->d_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);
}
d->d_name[sizeof(d->d_name) - 1] = 0;
/*
* Assume the first eight bytes of the value are
* a uint64_t.
*/
value = fzap_leaf_value(&zl, zc);
d->d_fileno = ZFS_DIRENT_OBJ(value);
d->d_type = ZFS_DIRENT_TYPE(value);
d->d_namlen = strlen(d->d_name);
return (0);
}
}
static int
vdev_read(vdev_t *vdev, void *priv, off_t offset, void *buf, size_t bytes)
{
int fd, ret;
size_t res, head, tail, total_size, full_sec_size;
unsigned secsz, do_tail_read;
off_t start_sec;
char *outbuf, *bouncebuf;
fd = (uintptr_t) priv;
outbuf = (char *) buf;
bouncebuf = NULL;
ret = ioctl(fd, DIOCGSECTORSIZE, &secsz);
if (ret != 0)
return (ret);
/*
* Handling reads of arbitrary offset and size - multi-sector case
* and single-sector case.
*
* Multi-sector Case
* (do_tail_read = true if tail > 0)
*
* |<----------------------total_size--------------------->|
* | |
* |<--head-->|<--------------bytes------------>|<--tail-->|
* | | | |
* | | |<~full_sec_size~>| | |
* +------------------+ +------------------+
* | |0101010| . . . |0101011| |
* +------------------+ +------------------+
* start_sec start_sec + n
*
*
* Single-sector Case
* (do_tail_read = false)
*
* |<------total_size = secsz----->|
* | |
* |<-head->|<---bytes--->|<-tail->|
* +-------------------------------+
* | |0101010101010| |
* +-------------------------------+
* start_sec
*/
start_sec = offset / secsz;
head = offset % secsz;
total_size = roundup2(head + bytes, secsz);
tail = total_size - (head + bytes);
do_tail_read = ((tail > 0) && (head + bytes > secsz));
full_sec_size = total_size;
if (head > 0)
full_sec_size -= secsz;
if (do_tail_read)
full_sec_size -= secsz;
/* Return of partial sector data requires a bounce buffer. */
if ((head > 0) || do_tail_read || bytes < secsz) {
bouncebuf = malloc(secsz);
if (bouncebuf == NULL) {
printf("vdev_read: out of memory\n");
return (ENOMEM);
}
}
if (lseek(fd, start_sec * secsz, SEEK_SET) == -1) {
ret = errno;
goto error;
}
/* Partial data return from first sector */
if (head > 0) {
res = read(fd, bouncebuf, secsz);
if (res != secsz) {
ret = EIO;
goto error;
}
memcpy(outbuf, bouncebuf + head, min(secsz - head, bytes));
outbuf += min(secsz - head, bytes);
}
/*
* Full data return from read sectors.
* Note, there is still corner case where we read
* from sector boundary, but less than sector size, e.g. reading 512B
* from 4k sector.
*/
if (full_sec_size > 0) {
if (bytes < full_sec_size) {
res = read(fd, bouncebuf, secsz);
if (res != secsz) {
ret = EIO;
goto error;
}
memcpy(outbuf, bouncebuf, bytes);
} else {
res = read(fd, outbuf, full_sec_size);
if (res != full_sec_size) {
ret = EIO;
goto error;
}
outbuf += full_sec_size;
}
}
/* Partial data return from last sector */
if (do_tail_read) {
res = read(fd, bouncebuf, secsz);
if (res != secsz) {
ret = EIO;
goto error;
}
memcpy(outbuf, bouncebuf, secsz - tail);
}
ret = 0;
error:
free(bouncebuf);
return (ret);
}
static int
vdev_write(vdev_t *vdev __unused, void *priv, off_t offset, void *buf,
size_t bytes)
{
int fd, ret;
size_t head, tail, total_size, full_sec_size;
unsigned secsz, do_tail_write;
off_t start_sec;
ssize_t res;
char *outbuf, *bouncebuf;
fd = (uintptr_t)priv;
outbuf = (char *) buf;
bouncebuf = NULL;
ret = ioctl(fd, DIOCGSECTORSIZE, &secsz);
if (ret != 0)
return (ret);
start_sec = offset / secsz;
head = offset % secsz;
total_size = roundup2(head + bytes, secsz);
tail = total_size - (head + bytes);
do_tail_write = ((tail > 0) && (head + bytes > secsz));
full_sec_size = total_size;
if (head > 0)
full_sec_size -= secsz;
if (do_tail_write)
full_sec_size -= secsz;
/* Partial sector write requires a bounce buffer. */
if ((head > 0) || do_tail_write || bytes < secsz) {
bouncebuf = malloc(secsz);
if (bouncebuf == NULL) {
printf("vdev_write: out of memory\n");
return (ENOMEM);
}
}
if (lseek(fd, start_sec * secsz, SEEK_SET) == -1) {
ret = errno;
goto error;
}
/* Partial data for first sector */
if (head > 0) {
res = read(fd, bouncebuf, secsz);
if (res != secsz) {
ret = EIO;
goto error;
}
memcpy(bouncebuf + head, outbuf, min(secsz - head, bytes));
(void) lseek(fd, -secsz, SEEK_CUR);
res = write(fd, bouncebuf, secsz);
if (res != secsz) {
ret = EIO;
goto error;
}
outbuf += min(secsz - head, bytes);
}
/*
* Full data write to sectors.
* Note, there is still corner case where we write
* to sector boundary, but less than sector size, e.g. write 512B
* to 4k sector.
*/
if (full_sec_size > 0) {
if (bytes < full_sec_size) {
res = read(fd, bouncebuf, secsz);
if (res != secsz) {
ret = EIO;
goto error;
}
memcpy(bouncebuf, outbuf, bytes);
(void) lseek(fd, -secsz, SEEK_CUR);
res = write(fd, bouncebuf, secsz);
if (res != secsz) {
ret = EIO;
goto error;
}
} else {
res = write(fd, outbuf, full_sec_size);
if (res != full_sec_size) {
ret = EIO;
goto error;
}
outbuf += full_sec_size;
}
}
/* Partial data write to last sector */
if (do_tail_write) {
res = read(fd, bouncebuf, secsz);
if (res != secsz) {
ret = EIO;
goto error;
}
memcpy(bouncebuf, outbuf, secsz - tail);
(void) lseek(fd, -secsz, SEEK_CUR);
res = write(fd, bouncebuf, secsz);
if (res != secsz) {
ret = EIO;
goto error;
}
}
ret = 0;
error:
free(bouncebuf);
return (ret);
}
static void
vdev_clear_pad2(vdev_t *vdev)
{
vdev_t *kid;
vdev_boot_envblock_t *be;
off_t off = offsetof(vdev_label_t, vl_be);
zio_checksum_info_t *ci;
zio_cksum_t cksum;
STAILQ_FOREACH(kid, &vdev->v_children, v_childlink) {
if (kid->v_state != VDEV_STATE_HEALTHY)
continue;
vdev_clear_pad2(kid);
}
if (!STAILQ_EMPTY(&vdev->v_children))
return;
be = calloc(1, sizeof (*be));
if (be == NULL) {
printf("failed to clear be area: out of memory\n");
return;
}
ci = &zio_checksum_table[ZIO_CHECKSUM_LABEL];
be->vbe_zbt.zec_magic = ZEC_MAGIC;
zio_checksum_label_verifier(&be->vbe_zbt.zec_cksum, off);
ci->ci_func[0](be, sizeof (*be), NULL, &cksum);
be->vbe_zbt.zec_cksum = cksum;
if (vdev_write(vdev, vdev->v_read_priv, off, be, VDEV_PAD_SIZE)) {
printf("failed to clear be area of primary vdev: %d\n",
errno);
}
free(be);
}
/*
* Read the next boot command from pad2.
* If any instance of pad2 is set to empty string, or the returned string
* values are not the same, we consider next boot not to be set.
*/
static char *
vdev_read_pad2(vdev_t *vdev)
{
vdev_t *kid;
char *tmp, *result = NULL;
vdev_boot_envblock_t *be;
off_t off = offsetof(vdev_label_t, vl_be);
STAILQ_FOREACH(kid, &vdev->v_children, v_childlink) {
if (kid->v_state != VDEV_STATE_HEALTHY)
continue;
tmp = vdev_read_pad2(kid);
if (tmp == NULL)
continue;
/* The next boot is not set, we are done. */
if (*tmp == '\0') {
free(result);
return (tmp);
}
if (result == NULL) {
result = tmp;
continue;
}
/* Are the next boot strings different? */
if (strcmp(result, tmp) != 0) {
free(tmp);
*result = '\0';
break;
}
free(tmp);
}
if (result != NULL)
return (result);
be = malloc(sizeof (*be));
if (be == NULL)
return (NULL);
if (vdev_read(vdev, vdev->v_read_priv, off, be, sizeof (*be))) {
return (NULL);
}
switch (be->vbe_version) {
case VB_RAW:
case VB_NVLIST:
result = strdup(be->vbe_bootenv);
default:
/* Backward compatibility with initial nextboot feaure. */
result = strdup((char *)be);
}
return (result);
}
static int
zfs_dev_init(void)
{
spa_t *spa;
spa_t *next;
spa_t *prev;
zfs_init();
if (archsw.arch_zfs_probe == NULL)
return (ENXIO);
archsw.arch_zfs_probe();
prev = NULL;
spa = STAILQ_FIRST(&zfs_pools);
while (spa != NULL) {
next = STAILQ_NEXT(spa, spa_link);
if (zfs_spa_init(spa)) {
if (prev == NULL)
STAILQ_REMOVE_HEAD(&zfs_pools, spa_link);
else
STAILQ_REMOVE_AFTER(&zfs_pools, prev, spa_link);
} else
prev = spa;
spa = next;
}
return (0);
}
struct zfs_probe_args {
int fd;
const char *devname;
uint64_t *pool_guid;
u_int secsz;
};
static int
zfs_diskread(void *arg, void *buf, size_t blocks, uint64_t offset)
{
struct zfs_probe_args *ppa;
ppa = (struct zfs_probe_args *)arg;
return (vdev_read(NULL, (void *)(uintptr_t)ppa->fd,
offset * ppa->secsz, buf, blocks * ppa->secsz));
}
static int
zfs_probe(int fd, uint64_t *pool_guid)
{
spa_t *spa;
int ret;
spa = NULL;
ret = vdev_probe(vdev_read, (void *)(uintptr_t)fd, &spa);
if (ret == 0 && pool_guid != NULL)
*pool_guid = spa->spa_guid;
return (ret);
}
static int
zfs_probe_partition(void *arg, const char *partname,
const struct ptable_entry *part)
{
struct zfs_probe_args *ppa, pa;
struct ptable *table;
char devname[32];
int ret;
/* Probe only freebsd-zfs and freebsd partitions */
if (part->type != PART_FREEBSD &&
part->type != PART_FREEBSD_ZFS)
return (0);
ppa = (struct zfs_probe_args *)arg;
strncpy(devname, ppa->devname, strlen(ppa->devname) - 1);
devname[strlen(ppa->devname) - 1] = '\0';
sprintf(devname, "%s%s:", devname, partname);
pa.fd = open(devname, O_RDWR);
if (pa.fd == -1)
return (0);
ret = zfs_probe(pa.fd, ppa->pool_guid);
if (ret == 0)
return (0);
/* Do we have BSD label here? */
if (part->type == PART_FREEBSD) {
pa.devname = devname;
pa.pool_guid = ppa->pool_guid;
pa.secsz = ppa->secsz;
table = ptable_open(&pa, part->end - part->start + 1,
ppa->secsz, zfs_diskread);
if (table != NULL) {
ptable_iterate(table, &pa, zfs_probe_partition);
ptable_close(table);
}
}
close(pa.fd);
return (0);
}
int
zfs_nextboot(void *vdev, char *buf, size_t size)
{
struct zfs_devdesc *dev = (struct zfs_devdesc *)vdev;
spa_t *spa;
vdev_t *vd;
char *result = NULL;
if (dev->dd.d_dev->dv_type != DEVT_ZFS)
return (1);
if (dev->pool_guid == 0)
spa = STAILQ_FIRST(&zfs_pools);
else
spa = spa_find_by_guid(dev->pool_guid);
if (spa == NULL) {
printf("ZFS: can't find pool by guid\n");
return (1);
}
STAILQ_FOREACH(vd, &spa->spa_root_vdev->v_children, v_childlink) {
char *tmp = vdev_read_pad2(vd);
/* Continue on error. */
if (tmp == NULL)
continue;
/* Nextboot is not set. */
if (*tmp == '\0') {
free(result);
free(tmp);
return (1);
}
if (result == NULL) {
result = tmp;
continue;
}
free(tmp);
}
if (result == NULL)
return (1);
STAILQ_FOREACH(vd, &spa->spa_root_vdev->v_children, v_childlink) {
vdev_clear_pad2(vd);
}
strlcpy(buf, result, size);
free(result);
return (0);
}
int
zfs_probe_dev(const char *devname, uint64_t *pool_guid)
{
struct disk_devdesc *dev;
struct ptable *table;
struct zfs_probe_args pa;
uint64_t mediasz;
int ret;
if (pool_guid)
*pool_guid = 0;
pa.fd = open(devname, O_RDWR);
if (pa.fd == -1)
return (ENXIO);
/*
* We will not probe the whole disk, we can not boot from such
* disks and some systems will misreport the disk sizes and will
* hang while accessing the disk.
*/
if (archsw.arch_getdev((void **)&dev, devname, NULL) == 0) {
int partition = dev->d_partition;
int slice = dev->d_slice;
free(dev);
if (partition != D_PARTNONE && slice != D_SLICENONE) {
ret = zfs_probe(pa.fd, pool_guid);
if (ret == 0)
return (0);
}
}
/* Probe each partition */
ret = ioctl(pa.fd, DIOCGMEDIASIZE, &mediasz);
if (ret == 0)
ret = ioctl(pa.fd, DIOCGSECTORSIZE, &pa.secsz);
if (ret == 0) {
pa.devname = devname;
pa.pool_guid = pool_guid;
table = ptable_open(&pa, mediasz / pa.secsz, pa.secsz,
zfs_diskread);
if (table != NULL) {
ptable_iterate(table, &pa, zfs_probe_partition);
ptable_close(table);
}
}
close(pa.fd);
if (pool_guid && *pool_guid == 0)
ret = ENXIO;
return (ret);
}
/*
* Print information about ZFS pools
*/
static int
zfs_dev_print(int verbose)
{
spa_t *spa;
char line[80];
int ret = 0;
if (STAILQ_EMPTY(&zfs_pools))
return (0);
printf("%s devices:", zfs_dev.dv_name);
if ((ret = pager_output("\n")) != 0)
return (ret);
if (verbose) {
return (spa_all_status());
}
STAILQ_FOREACH(spa, &zfs_pools, spa_link) {
snprintf(line, sizeof(line), " zfs:%s\n", spa->spa_name);
ret = pager_output(line);
if (ret != 0)
break;
}
return (ret);
}
/*
* Attempt to open the pool described by (dev) for use by (f).
*/
static int
zfs_dev_open(struct open_file *f, ...)
{
va_list args;
struct zfs_devdesc *dev;
struct zfsmount *mount;
spa_t *spa;
int rv;
va_start(args, f);
dev = va_arg(args, struct zfs_devdesc *);
va_end(args);
if (dev->pool_guid == 0)
spa = STAILQ_FIRST(&zfs_pools);
else
spa = spa_find_by_guid(dev->pool_guid);
if (!spa)
return (ENXIO);
mount = malloc(sizeof(*mount));
if (mount == NULL)
rv = ENOMEM;
else
rv = zfs_mount(spa, dev->root_guid, mount);
if (rv != 0) {
free(mount);
return (rv);
}
if (mount->objset.os_type != DMU_OST_ZFS) {
printf("Unexpected object set type %ju\n",
(uintmax_t)mount->objset.os_type);
free(mount);
return (EIO);
}
f->f_devdata = mount;
free(dev);
return (0);
}
static int
zfs_dev_close(struct open_file *f)
{
free(f->f_devdata);
f->f_devdata = NULL;
return (0);
}
static int
zfs_dev_strategy(void *devdata, int rw, daddr_t dblk, size_t size, char *buf, size_t *rsize)
{
return (ENOSYS);
}
struct devsw zfs_dev = {
.dv_name = "zfs",
.dv_type = DEVT_ZFS,
.dv_init = zfs_dev_init,
.dv_strategy = zfs_dev_strategy,
.dv_open = zfs_dev_open,
.dv_close = zfs_dev_close,
.dv_ioctl = noioctl,
.dv_print = zfs_dev_print,
.dv_cleanup = NULL
};
int
zfs_parsedev(struct zfs_devdesc *dev, const char *devspec, const char **path)
{
static char rootname[ZFS_MAXNAMELEN];
static char poolname[ZFS_MAXNAMELEN];