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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
*
* Copyright (c) 2006-2010 Pawel Jakub Dawidek <pjd@FreeBSD.org>
* All rights reserved.
*/
/* Portions Copyright 2010 Robert Milkowski */
/* Portions Copyright 2011 Martin Matuska <mm@FreeBSD.org> */
/*
* ZFS volume emulation driver.
*
* Makes a DMU object look like a volume of arbitrary size, up to 2^64 bytes.
* Volumes are accessed through the symbolic links named:
*
* /dev/zvol/dsk/<pool_name>/<dataset_name>
* /dev/zvol/rdsk/<pool_name>/<dataset_name>
*
* These links are created by the /dev filesystem (sdev_zvolops.c).
* Volumes are persistent through reboot. No user command needs to be
* run before opening and using a device.
*
* FreeBSD notes.
* On FreeBSD ZVOLs are simply GEOM providers like any other storage device
* in the system.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/errno.h>
#include <sys/uio.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/kmem.h>
#include <sys/conf.h>
#include <sys/cmn_err.h>
#include <sys/stat.h>
#include <sys/zap.h>
#include <sys/spa.h>
#include <sys/zio.h>
#include <sys/dmu_traverse.h>
#include <sys/dnode.h>
#include <sys/dsl_dataset.h>
#include <sys/dsl_prop.h>
#include <sys/dkio.h>
#include <sys/byteorder.h>
#include <sys/sunddi.h>
#include <sys/dirent.h>
#include <sys/policy.h>
#include <sys/fs/zfs.h>
#include <sys/zfs_ioctl.h>
#include <sys/zil.h>
#include <sys/refcount.h>
#include <sys/zfs_znode.h>
#include <sys/zfs_rlock.h>
#include <sys/vdev_impl.h>
#include <sys/zvol.h>
#include <sys/zil_impl.h>
#include <geom/geom.h>
#include "zfs_namecheck.h"
struct g_class zfs_zvol_class = {
.name = "ZFS::ZVOL",
.version = G_VERSION,
};
DECLARE_GEOM_CLASS(zfs_zvol_class, zfs_zvol);
void *zfsdev_state;
static char *zvol_tag = "zvol_tag";
#define ZVOL_DUMPSIZE "dumpsize"
/*
* The spa_namespace_lock protects the zfsdev_state structure from being
* modified while it's being used, e.g. an open that comes in before a
* create finishes. It also protects temporary opens of the dataset so that,
* e.g., an open doesn't get a spurious EBUSY.
*/
static uint32_t zvol_minors;
typedef struct zvol_extent {
list_node_t ze_node;
dva_t ze_dva; /* dva associated with this extent */
uint64_t ze_nblks; /* number of blocks in extent */
} zvol_extent_t;
/*
* The in-core state of each volume.
*/
typedef struct zvol_state {
char zv_name[MAXPATHLEN]; /* pool/dd name */
uint64_t zv_volsize; /* amount of space we advertise */
uint64_t zv_volblocksize; /* volume block size */
struct g_provider *zv_provider; /* GEOM provider */
uint8_t zv_min_bs; /* minimum addressable block shift */
uint8_t zv_flags; /* readonly, dumpified, etc. */
objset_t *zv_objset; /* objset handle */
uint32_t zv_total_opens; /* total open count */
zilog_t *zv_zilog; /* ZIL handle */
list_t zv_extents; /* List of extents for dump */
znode_t zv_znode; /* for range locking */
dmu_buf_t *zv_dbuf; /* bonus handle */
int zv_state;
struct bio_queue_head zv_queue;
struct mtx zv_queue_mtx; /* zv_queue mutex */
} zvol_state_t;
/*
* zvol specific flags
*/
#define ZVOL_RDONLY 0x1
#define ZVOL_DUMPIFIED 0x2
#define ZVOL_EXCL 0x4
#define ZVOL_WCE 0x8
/*
* zvol maximum transfer in one DMU tx.
*/
int zvol_maxphys = DMU_MAX_ACCESS/2;
extern int zfs_set_prop_nvlist(const char *, zprop_source_t,
nvlist_t *, nvlist_t **);
static int zvol_remove_zv(zvol_state_t *);
static int zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio);
static int zvol_dumpify(zvol_state_t *zv);
static int zvol_dump_fini(zvol_state_t *zv);
static int zvol_dump_init(zvol_state_t *zv, boolean_t resize);
static zvol_state_t *zvol_geom_create(const char *name);
static void zvol_geom_run(zvol_state_t *zv);
static void zvol_geom_destroy(zvol_state_t *zv);
static int zvol_geom_access(struct g_provider *pp, int acr, int acw, int ace);
static void zvol_geom_start(struct bio *bp);
static void zvol_geom_worker(void *arg);
static void
zvol_size_changed(zvol_state_t *zv)
{
#ifdef sun
dev_t dev = makedevice(maj, min);
VERIFY(ddi_prop_update_int64(dev, zfs_dip,
"Size", volsize) == DDI_SUCCESS);
VERIFY(ddi_prop_update_int64(dev, zfs_dip,
"Nblocks", lbtodb(volsize)) == DDI_SUCCESS);
/* Notify specfs to invalidate the cached size */
spec_size_invalidate(dev, VBLK);
spec_size_invalidate(dev, VCHR);
#else /* !sun */
struct g_provider *pp;
pp = zv->zv_provider;
if (pp == NULL)
return;
if (zv->zv_volsize == pp->mediasize)
return;
/*
* Changing provider size is not really supported by GEOM, but it
* should be safe when provider is closed.
*/
if (zv->zv_total_opens > 0)
return;
pp->mediasize = zv->zv_volsize;
#endif /* !sun */
}
int
zvol_check_volsize(uint64_t volsize, uint64_t blocksize)
{
if (volsize == 0)
return (EINVAL);
if (volsize % blocksize != 0)
return (EINVAL);
#ifdef _ILP32
if (volsize - 1 > SPEC_MAXOFFSET_T)
return (EOVERFLOW);
#endif
return (0);
}
int
zvol_check_volblocksize(uint64_t volblocksize)
{
if (volblocksize < SPA_MINBLOCKSIZE ||
volblocksize > SPA_MAXBLOCKSIZE ||
!ISP2(volblocksize))
return (EDOM);
return (0);
}
int
zvol_get_stats(objset_t *os, nvlist_t *nv)
{
int error;
dmu_object_info_t doi;
uint64_t val;
error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val);
if (error)
return (error);
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val);
error = dmu_object_info(os, ZVOL_OBJ, &doi);
if (error == 0) {
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE,
doi.doi_data_block_size);
}
return (error);
}
static zvol_state_t *
zvol_minor_lookup(const char *name)
{
struct g_provider *pp;
struct g_geom *gp;
zvol_state_t *zv = NULL;
ASSERT(MUTEX_HELD(&spa_namespace_lock));
g_topology_lock();
LIST_FOREACH(gp, &zfs_zvol_class.geom, geom) {
pp = LIST_FIRST(&gp->provider);
if (pp == NULL)
continue;
zv = pp->private;
if (zv == NULL)
continue;
if (strcmp(zv->zv_name, name) == 0)
break;
}
g_topology_unlock();
return (gp != NULL ? zv : NULL);
}
/* extent mapping arg */
struct maparg {
zvol_state_t *ma_zv;
uint64_t ma_blks;
};
/*ARGSUSED*/
static int
zvol_map_block(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, arc_buf_t *pbuf,
const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg)
{
struct maparg *ma = arg;
zvol_extent_t *ze;
int bs = ma->ma_zv->zv_volblocksize;
if (bp == NULL || zb->zb_object != ZVOL_OBJ || zb->zb_level != 0)
return (0);
VERIFY3U(ma->ma_blks, ==, zb->zb_blkid);
ma->ma_blks++;
/* Abort immediately if we have encountered gang blocks */
if (BP_IS_GANG(bp))
return (EFRAGS);
/*
* See if the block is at the end of the previous extent.
*/
ze = list_tail(&ma->ma_zv->zv_extents);
if (ze &&
DVA_GET_VDEV(BP_IDENTITY(bp)) == DVA_GET_VDEV(&ze->ze_dva) &&
DVA_GET_OFFSET(BP_IDENTITY(bp)) ==
DVA_GET_OFFSET(&ze->ze_dva) + ze->ze_nblks * bs) {
ze->ze_nblks++;
return (0);
}
dprintf_bp(bp, "%s", "next blkptr:");
/* start a new extent */
ze = kmem_zalloc(sizeof (zvol_extent_t), KM_SLEEP);
ze->ze_dva = bp->blk_dva[0]; /* structure assignment */
ze->ze_nblks = 1;
list_insert_tail(&ma->ma_zv->zv_extents, ze);
return (0);
}
static void
zvol_free_extents(zvol_state_t *zv)
{
zvol_extent_t *ze;
while (ze = list_head(&zv->zv_extents)) {
list_remove(&zv->zv_extents, ze);
kmem_free(ze, sizeof (zvol_extent_t));
}
}
static int
zvol_get_lbas(zvol_state_t *zv)
{
objset_t *os = zv->zv_objset;
struct maparg ma;
int err;
ma.ma_zv = zv;
ma.ma_blks = 0;
zvol_free_extents(zv);
/* commit any in-flight changes before traversing the dataset */
txg_wait_synced(dmu_objset_pool(os), 0);
err = traverse_dataset(dmu_objset_ds(os), 0,
TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, zvol_map_block, &ma);
if (err || ma.ma_blks != (zv->zv_volsize / zv->zv_volblocksize)) {
zvol_free_extents(zv);
return (err ? err : EIO);
}
return (0);
}
/* ARGSUSED */
void
zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx)
{
zfs_creat_t *zct = arg;
nvlist_t *nvprops = zct->zct_props;
int error;
uint64_t volblocksize, volsize;
VERIFY(nvlist_lookup_uint64(nvprops,
zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0);
if (nvlist_lookup_uint64(nvprops,
zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0)
volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE);
/*
* These properties must be removed from the list so the generic
* property setting step won't apply to them.
*/
VERIFY(nvlist_remove_all(nvprops,
zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0);
(void) nvlist_remove_all(nvprops,
zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE));
error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize,
DMU_OT_NONE, 0, tx);
ASSERT(error == 0);
error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP,
DMU_OT_NONE, 0, tx);
ASSERT(error == 0);
error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx);
ASSERT(error == 0);
}
/*
* Replay a TX_WRITE ZIL transaction that didn't get committed
* after a system failure
*/
static int
zvol_replay_write(zvol_state_t *zv, lr_write_t *lr, boolean_t byteswap)
{
objset_t *os = zv->zv_objset;
char *data = (char *)(lr + 1); /* data follows lr_write_t */
uint64_t offset, length;
dmu_tx_t *tx;
int error;
if (byteswap)
byteswap_uint64_array(lr, sizeof (*lr));
offset = lr->lr_offset;
length = lr->lr_length;
/* If it's a dmu_sync() block, write the whole block */
if (lr->lr_common.lrc_reclen == sizeof (lr_write_t)) {
uint64_t blocksize = BP_GET_LSIZE(&lr->lr_blkptr);
if (length < blocksize) {
offset -= offset % blocksize;
length = blocksize;
}
}
tx = dmu_tx_create(os);
dmu_tx_hold_write(tx, ZVOL_OBJ, offset, length);
error = dmu_tx_assign(tx, TXG_WAIT);
if (error) {
dmu_tx_abort(tx);
} else {
dmu_write(os, ZVOL_OBJ, offset, length, data, tx);
dmu_tx_commit(tx);
}
return (error);
}
/* ARGSUSED */
static int
zvol_replay_err(zvol_state_t *zv, lr_t *lr, boolean_t byteswap)
{
return (ENOTSUP);
}
/*
* Callback vectors for replaying records.
* Only TX_WRITE is needed for zvol.
*/
zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = {
zvol_replay_err, /* 0 no such transaction type */
zvol_replay_err, /* TX_CREATE */
zvol_replay_err, /* TX_MKDIR */
zvol_replay_err, /* TX_MKXATTR */
zvol_replay_err, /* TX_SYMLINK */
zvol_replay_err, /* TX_REMOVE */
zvol_replay_err, /* TX_RMDIR */
zvol_replay_err, /* TX_LINK */
zvol_replay_err, /* TX_RENAME */
zvol_replay_write, /* TX_WRITE */
zvol_replay_err, /* TX_TRUNCATE */
zvol_replay_err, /* TX_SETATTR */
zvol_replay_err, /* TX_ACL */
zvol_replay_err, /* TX_CREATE_ACL */
zvol_replay_err, /* TX_CREATE_ATTR */
zvol_replay_err, /* TX_CREATE_ACL_ATTR */
zvol_replay_err, /* TX_MKDIR_ACL */
zvol_replay_err, /* TX_MKDIR_ATTR */
zvol_replay_err, /* TX_MKDIR_ACL_ATTR */
zvol_replay_err, /* TX_WRITE2 */
};
#ifdef sun
int
zvol_name2minor(const char *name, minor_t *minor)
{
zvol_state_t *zv;
mutex_enter(&spa_namespace_lock);
zv = zvol_minor_lookup(name);
if (minor && zv)
*minor = zv->zv_minor;
mutex_exit(&spa_namespace_lock);
return (zv ? 0 : -1);
}
#endif /* sun */
/*
* Create a minor node (plus a whole lot more) for the specified volume.
*/
int
zvol_create_minor(const char *name)
{
zfs_soft_state_t *zs;
zvol_state_t *zv;
objset_t *os;
dmu_object_info_t doi;
int error;
ZFS_LOG(1, "Creating ZVOL %s...", name);
mutex_enter(&spa_namespace_lock);
if (zvol_minor_lookup(name) != NULL) {
mutex_exit(&spa_namespace_lock);
return (EEXIST);
}
/* lie and say we're read-only */
error = dmu_objset_own(name, DMU_OST_ZVOL, B_TRUE, FTAG, &os);
if (error) {
mutex_exit(&spa_namespace_lock);
return (error);
}
#ifdef sun
if ((minor = zfsdev_minor_alloc()) == 0) {
dmu_objset_disown(os, FTAG);
mutex_exit(&spa_namespace_lock);
return (ENXIO);
}
if (ddi_soft_state_zalloc(zfsdev_state, minor) != DDI_SUCCESS) {
dmu_objset_disown(os, FTAG);
mutex_exit(&spa_namespace_lock);
return (EAGAIN);
}
(void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME,
(char *)name);
(void) snprintf(chrbuf, sizeof (chrbuf), "%u,raw", minor);
if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR,
minor, DDI_PSEUDO, 0) == DDI_FAILURE) {
ddi_soft_state_free(zfsdev_state, minor);
dmu_objset_disown(os, FTAG);
mutex_exit(&spa_namespace_lock);
return (EAGAIN);
}
(void) snprintf(blkbuf, sizeof (blkbuf), "%u", minor);
if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK,
minor, DDI_PSEUDO, 0) == DDI_FAILURE) {
ddi_remove_minor_node(zfs_dip, chrbuf);
ddi_soft_state_free(zfsdev_state, minor);
dmu_objset_disown(os, FTAG);
mutex_exit(&spa_namespace_lock);
return (EAGAIN);
}
zs = ddi_get_soft_state(zfsdev_state, minor);
zs->zss_type = ZSST_ZVOL;
zv = zs->zss_data = kmem_zalloc(sizeof (zvol_state_t), KM_SLEEP);
#else /* !sun */
DROP_GIANT();
g_topology_lock();
zv = zvol_geom_create(name);
#endif /* !sun */
(void) strlcpy(zv->zv_name, name, MAXPATHLEN);
zv->zv_min_bs = DEV_BSHIFT;
zv->zv_objset = os;
if (dmu_objset_is_snapshot(os) || !spa_writeable(dmu_objset_spa(os)))
zv->zv_flags |= ZVOL_RDONLY;
mutex_init(&zv->zv_znode.z_range_lock, NULL, MUTEX_DEFAULT, NULL);
avl_create(&zv->zv_znode.z_range_avl, zfs_range_compare,
sizeof (rl_t), offsetof(rl_t, r_node));
list_create(&zv->zv_extents, sizeof (zvol_extent_t),
offsetof(zvol_extent_t, ze_node));
/* get and cache the blocksize */
error = dmu_object_info(os, ZVOL_OBJ, &doi);
ASSERT(error == 0);
zv->zv_volblocksize = doi.doi_data_block_size;
if (spa_writeable(dmu_objset_spa(os))) {
if (zil_replay_disable)
zil_destroy(dmu_objset_zil(os), B_FALSE);
else
zil_replay(os, zv, zvol_replay_vector);
}
dmu_objset_disown(os, FTAG);
zv->zv_objset = NULL;
zvol_minors++;
mutex_exit(&spa_namespace_lock);
zvol_geom_run(zv);
g_topology_unlock();
PICKUP_GIANT();
ZFS_LOG(1, "ZVOL %s created.", name);
return (0);
}
/*
* Remove minor node for the specified volume.
*/
static int
zvol_remove_zv(zvol_state_t *zv)
{
#ifdef sun
minor_t minor = zv->zv_minor;
#endif
ASSERT(MUTEX_HELD(&spa_namespace_lock));
if (zv->zv_total_opens != 0)
return (EBUSY);
ZFS_LOG(1, "ZVOL %s destroyed.", zv->zv_name);
#ifdef sun
(void) snprintf(nmbuf, sizeof (nmbuf), "%u,raw", minor);
ddi_remove_minor_node(zfs_dip, nmbuf);
#endif /* sun */
avl_destroy(&zv->zv_znode.z_range_avl);
mutex_destroy(&zv->zv_znode.z_range_lock);
zvol_geom_destroy(zv);
zvol_minors--;
return (0);
}
int
zvol_remove_minor(const char *name)
{
zvol_state_t *zv;
int rc;
mutex_enter(&spa_namespace_lock);
if ((zv = zvol_minor_lookup(name)) == NULL) {
mutex_exit(&spa_namespace_lock);
return (ENXIO);
}
g_topology_lock();
rc = zvol_remove_zv(zv);
g_topology_unlock();
mutex_exit(&spa_namespace_lock);
return (rc);
}
int
zvol_first_open(zvol_state_t *zv)
{
objset_t *os;
uint64_t volsize;
int error;
uint64_t readonly;
/* lie and say we're read-only */
error = dmu_objset_own(zv->zv_name, DMU_OST_ZVOL, B_TRUE,
zvol_tag, &os);
if (error)
return (error);
error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize);
if (error) {
ASSERT(error == 0);
dmu_objset_disown(os, zvol_tag);
return (error);
}
zv->zv_objset = os;
error = dmu_bonus_hold(os, ZVOL_OBJ, zvol_tag, &zv->zv_dbuf);
if (error) {
dmu_objset_disown(os, zvol_tag);
return (error);
}
zv->zv_volsize = volsize;
zv->zv_zilog = zil_open(os, zvol_get_data);
zvol_size_changed(zv);
VERIFY(dsl_prop_get_integer(zv->zv_name, "readonly", &readonly,
NULL) == 0);
if (readonly || dmu_objset_is_snapshot(os) ||
!spa_writeable(dmu_objset_spa(os)))
zv->zv_flags |= ZVOL_RDONLY;
else
zv->zv_flags &= ~ZVOL_RDONLY;
return (error);
}
void
zvol_last_close(zvol_state_t *zv)
{
zil_close(zv->zv_zilog);
zv->zv_zilog = NULL;
dmu_buf_rele(zv->zv_dbuf, zvol_tag);
zv->zv_dbuf = NULL;
dmu_objset_disown(zv->zv_objset, zvol_tag);
zv->zv_objset = NULL;
}
#ifdef sun
int
zvol_prealloc(zvol_state_t *zv)
{
objset_t *os = zv->zv_objset;
dmu_tx_t *tx;
uint64_t refd, avail, usedobjs, availobjs;
uint64_t resid = zv->zv_volsize;
uint64_t off = 0;
/* Check the space usage before attempting to allocate the space */
dmu_objset_space(os, &refd, &avail, &usedobjs, &availobjs);
if (avail < zv->zv_volsize)
return (ENOSPC);
/* Free old extents if they exist */
zvol_free_extents(zv);
while (resid != 0) {
int error;
uint64_t bytes = MIN(resid, SPA_MAXBLOCKSIZE);
tx = dmu_tx_create(os);
dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes);
error = dmu_tx_assign(tx, TXG_WAIT);
if (error) {
dmu_tx_abort(tx);
(void) dmu_free_long_range(os, ZVOL_OBJ, 0, off);
return (error);
}
dmu_prealloc(os, ZVOL_OBJ, off, bytes, tx);
dmu_tx_commit(tx);
off += bytes;
resid -= bytes;
}
txg_wait_synced(dmu_objset_pool(os), 0);
return (0);
}
#endif /* sun */
int
zvol_update_volsize(objset_t *os, uint64_t volsize)
{
dmu_tx_t *tx;
int error;
ASSERT(MUTEX_HELD(&spa_namespace_lock));
tx = dmu_tx_create(os);
dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
error = dmu_tx_assign(tx, TXG_WAIT);
if (error) {
dmu_tx_abort(tx);
return (error);
}
error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1,
&volsize, tx);
dmu_tx_commit(tx);
if (error == 0)
error = dmu_free_long_range(os,
ZVOL_OBJ, volsize, DMU_OBJECT_END);
return (error);
}
void
zvol_remove_minors(const char *name)
{
struct g_geom *gp, *gptmp;
struct g_provider *pp;
zvol_state_t *zv;
size_t namelen;
namelen = strlen(name);
DROP_GIANT();
mutex_enter(&spa_namespace_lock);
g_topology_lock();
LIST_FOREACH_SAFE(gp, &zfs_zvol_class.geom, geom, gptmp) {
pp = LIST_FIRST(&gp->provider);
if (pp == NULL)
continue;
zv = pp->private;
if (zv == NULL)
continue;
if (strcmp(zv->zv_name, name) == 0 ||
(strncmp(zv->zv_name, name, namelen) == 0 &&
zv->zv_name[namelen] == '/')) {
(void) zvol_remove_zv(zv);
}
}
g_topology_unlock();
mutex_exit(&spa_namespace_lock);
PICKUP_GIANT();
}
int
zvol_set_volsize(const char *name, major_t maj, uint64_t volsize)
{
zvol_state_t *zv = NULL;
objset_t *os;
int error;
dmu_object_info_t doi;
uint64_t old_volsize = 0ULL;
uint64_t readonly;
mutex_enter(&spa_namespace_lock);
zv = zvol_minor_lookup(name);
if ((error = dmu_objset_hold(name, FTAG, &os)) != 0) {
mutex_exit(&spa_namespace_lock);
return (error);
}
if ((error = dmu_object_info(os, ZVOL_OBJ, &doi)) != 0 ||
(error = zvol_check_volsize(volsize,
doi.doi_data_block_size)) != 0)
goto out;
VERIFY(dsl_prop_get_integer(name, "readonly", &readonly,
NULL) == 0);
if (readonly) {
error = EROFS;
goto out;
}
error = zvol_update_volsize(os, volsize);
/*
* Reinitialize the dump area to the new size. If we
* failed to resize the dump area then restore it back to
* its original size.
*/
if (zv && error == 0) {
#ifdef ZVOL_DUMP
if (zv->zv_flags & ZVOL_DUMPIFIED) {
old_volsize = zv->zv_volsize;
zv->zv_volsize = volsize;
if ((error = zvol_dumpify(zv)) != 0 ||
(error = dumpvp_resize()) != 0) {
(void) zvol_update_volsize(os, old_volsize);
zv->zv_volsize = old_volsize;
error = zvol_dumpify(zv);
}
}
#endif /* ZVOL_DUMP */
if (error == 0) {
zv->zv_volsize = volsize;
zvol_size_changed(zv);
}
}
#ifdef sun
/*
* Generate a LUN expansion event.
*/
if (zv && error == 0) {
sysevent_id_t eid;
nvlist_t *attr;
char *physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP);
(void) snprintf(physpath, MAXPATHLEN, "%s%u", ZVOL_PSEUDO_DEV,
zv->zv_minor);
VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0);
VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0);
(void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS,
ESC_DEV_DLE, attr, &eid, DDI_SLEEP);
nvlist_free(attr);
kmem_free(physpath, MAXPATHLEN);
}
#endif /* sun */
out:
dmu_objset_rele(os, FTAG);
mutex_exit(&spa_namespace_lock);
return (error);
}
/*ARGSUSED*/
static int
zvol_open(struct g_provider *pp, int flag, int count)
{
zvol_state_t *zv;
int err = 0;
if (MUTEX_HELD(&spa_namespace_lock)) {
/*
* If the spa_namespace_lock is being held, it means that ZFS
* is trying to open ZVOL as its VDEV. This is not supported.
*/
return (EOPNOTSUPP);
}
mutex_enter(&spa_namespace_lock);
zv = pp->private;
if (zv == NULL) {
mutex_exit(&spa_namespace_lock);
return (ENXIO);
}
if (zv->zv_total_opens == 0)
err = zvol_first_open(zv);
if (err) {
mutex_exit(&spa_namespace_lock);
return (err);
}
if ((flag & FWRITE) && (zv->zv_flags & ZVOL_RDONLY)) {
err = EROFS;
goto out;
}
if (zv->zv_flags & ZVOL_EXCL) {
err = EBUSY;
goto out;
}
#ifdef FEXCL
if (flag & FEXCL) {
if (zv->zv_total_opens != 0) {
err = EBUSY;
goto out;
}
zv->zv_flags |= ZVOL_EXCL;
}
#endif
zv->zv_total_opens += count;
mutex_exit(&spa_namespace_lock);
return (err);
out:
if (zv->zv_total_opens == 0)
zvol_last_close(zv);
mutex_exit(&spa_namespace_lock);
return (err);
}
/*ARGSUSED*/
static int
zvol_close(struct g_provider *pp, int flag, int count)
{
zvol_state_t *zv;
int error = 0;
mutex_enter(&spa_namespace_lock);
zv = pp->private;
if (zv == NULL) {
mutex_exit(&spa_namespace_lock);
return (ENXIO);
}
if (zv->zv_flags & ZVOL_EXCL) {
ASSERT(zv->zv_total_opens == 1);
zv->zv_flags &= ~ZVOL_EXCL;
}
/*
* If the open count is zero, this is a spurious close.
* That indicates a bug in the kernel / DDI framework.
*/
ASSERT(zv->zv_total_opens != 0);
/*
* You may get multiple opens, but only one close.
*/
zv->zv_total_opens -= count;
if (zv->zv_total_opens == 0)
zvol_last_close(zv);
mutex_exit(&spa_namespace_lock);
return (error);
}
static void
zvol_get_done(zgd_t *zgd, int error)
{
if (zgd->zgd_db)
dmu_buf_rele(zgd->zgd_db, zgd);
zfs_range_unlock(zgd->zgd_rl);
if (error == 0 && zgd->zgd_bp)
zil_add_block(zgd->zgd_zilog, zgd->zgd_bp);
kmem_free(zgd, sizeof (zgd_t));
}
/*
* Get data to generate a TX_WRITE intent log record.
*/
static int
zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio)
{
zvol_state_t *zv = arg;
objset_t *os = zv->zv_objset;
uint64_t object = ZVOL_OBJ;
uint64_t offset = lr->lr_offset;
uint64_t size = lr->lr_length; /* length of user data */
blkptr_t *bp = &lr->lr_blkptr;
dmu_buf_t *db;
zgd_t *zgd;
int error;
ASSERT(zio != NULL);
ASSERT(size != 0);
zgd = kmem_zalloc(sizeof (zgd_t), KM_SLEEP);
zgd->zgd_zilog = zv->zv_zilog;
zgd->zgd_rl = zfs_range_lock(&zv->zv_znode, offset, size, RL_READER);
/*
* Write records come in two flavors: immediate and indirect.
* For small writes it's cheaper to store the data with the
* log record (immediate); for large writes it's cheaper to
* sync the data and get a pointer to it (indirect) so that
* we don't have to write the data twice.
*/
if (buf != NULL) { /* immediate write */
error = dmu_read(os, object, offset, size, buf,
DMU_READ_NO_PREFETCH);
} else {
size = zv->zv_volblocksize;
offset = P2ALIGN(offset, size);
error = dmu_buf_hold(os, object, offset, zgd, &db,
DMU_READ_NO_PREFETCH);
if (error == 0) {
zgd->zgd_db = db;
zgd->zgd_bp = bp;
ASSERT(db->db_offset == offset);
ASSERT(db->db_size == size);
error = dmu_sync(zio, lr->lr_common.lrc_txg,
zvol_get_done, zgd);
if (error == 0)
return (0);
}
}
zvol_get_done(zgd, error);
return (error);
}
/*
* zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions.
*
* We store data in the log buffers if it's small enough.
* Otherwise we will later flush the data out via dmu_sync().
*/
ssize_t zvol_immediate_write_sz = 32768;
static void
zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t resid,
boolean_t sync)
{
uint32_t blocksize = zv->zv_volblocksize;
zilog_t *zilog = zv->zv_zilog;
boolean_t slogging;
ssize_t immediate_write_sz;
if (zil_replaying(zilog, tx))
return;
immediate_write_sz = (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT)
? 0 : zvol_immediate_write_sz;
slogging = spa_has_slogs(zilog->zl_spa) &&
(zilog->zl_logbias == ZFS_LOGBIAS_LATENCY);
while (resid) {
itx_t *itx;
lr_write_t *lr;
ssize_t len;
itx_wr_state_t write_state;
/*
* Unlike zfs_log_write() we can be called with
* upto DMU_MAX_ACCESS/2 (5MB) writes.
*/
if (blocksize > immediate_write_sz && !slogging &&
resid >= blocksize && off % blocksize == 0) {
write_state = WR_INDIRECT; /* uses dmu_sync */
len = blocksize;
} else if (sync) {
write_state = WR_COPIED;
len = MIN(ZIL_MAX_LOG_DATA, resid);
} else {
write_state = WR_NEED_COPY;
len = MIN(ZIL_MAX_LOG_DATA, resid);
}
itx = zil_itx_create(TX_WRITE, sizeof (*lr) +
(write_state == WR_COPIED ? len : 0));
lr = (lr_write_t *)&itx->itx_lr;
if (write_state == WR_COPIED && dmu_read(zv->zv_objset,
ZVOL_OBJ, off, len, lr + 1, DMU_READ_NO_PREFETCH) != 0) {
zil_itx_destroy(itx);
itx = zil_itx_create(TX_WRITE, sizeof (*lr));
lr = (lr_write_t *)&itx->itx_lr;
write_state = WR_NEED_COPY;
}
itx->itx_wr_state = write_state;
if (write_state == WR_NEED_COPY)
itx->itx_sod += len;
lr->lr_foid = ZVOL_OBJ;
lr->lr_offset = off;
lr->lr_length = len;
lr->lr_blkoff = 0;
BP_ZERO(&lr->lr_blkptr);
itx->itx_private = zv;
itx->itx_sync = sync;
zil_itx_assign(zilog, itx, tx);
off += len;
resid -= len;
}
}
#ifdef sun
static int
zvol_dumpio_vdev(vdev_t *vd, void *addr, uint64_t offset, uint64_t size,
boolean_t doread, boolean_t isdump)
{
vdev_disk_t *dvd;
int c;
int numerrors = 0;
for (c = 0; c < vd->vdev_children; c++) {
ASSERT(vd->vdev_ops == &vdev_mirror_ops ||
vd->vdev_ops == &vdev_replacing_ops ||
vd->vdev_ops == &vdev_spare_ops);
int err = zvol_dumpio_vdev(vd->vdev_child[c],
addr, offset, size, doread, isdump);
if (err != 0) {
numerrors++;
} else if (doread) {
break;
}
}
if (!vd->vdev_ops->vdev_op_leaf)
return (numerrors < vd->vdev_children ? 0 : EIO);
if (doread && !vdev_readable(vd))
return (EIO);
else if (!doread && !vdev_writeable(vd))
return (EIO);
dvd = vd->vdev_tsd;
ASSERT3P(dvd, !=, NULL);
offset += VDEV_LABEL_START_SIZE;
if (ddi_in_panic() || isdump) {
ASSERT(!doread);
if (doread)
return (EIO);
return (ldi_dump(dvd->vd_lh, addr, lbtodb(offset),
lbtodb(size)));
} else {
return (vdev_disk_physio(dvd->vd_lh, addr, size, offset,
doread ? B_READ : B_WRITE));
}
}
static int
zvol_dumpio(zvol_state_t *zv, void *addr, uint64_t offset, uint64_t size,
boolean_t doread, boolean_t isdump)
{
vdev_t *vd;
int error;
zvol_extent_t *ze;
spa_t *spa = dmu_objset_spa(zv->zv_objset);
/* Must be sector aligned, and not stradle a block boundary. */
if (P2PHASE(offset, DEV_BSIZE) || P2PHASE(size, DEV_BSIZE) ||
P2BOUNDARY(offset, size, zv->zv_volblocksize)) {
return (EINVAL);
}
ASSERT(size <= zv->zv_volblocksize);
/* Locate the extent this belongs to */
ze = list_head(&zv->zv_extents);
while (offset >= ze->ze_nblks * zv->zv_volblocksize) {
offset -= ze->ze_nblks * zv->zv_volblocksize;
ze = list_next(&zv->zv_extents, ze);
}
if (!ddi_in_panic())
spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
vd = vdev_lookup_top(spa, DVA_GET_VDEV(&ze->ze_dva));
offset += DVA_GET_OFFSET(&ze->ze_dva);
error = zvol_dumpio_vdev(vd, addr, offset, size, doread, isdump);
if (!ddi_in_panic())
spa_config_exit(spa, SCL_STATE, FTAG);
return (error);
}
#endif /* sun */
int
zvol_strategy(struct bio *bp)
{
zvol_state_t *zv = bp->bio_to->private;
uint64_t off, volsize;
size_t resid;
char *addr;
objset_t *os;
rl_t *rl;
int error = 0;
boolean_t doread = (bp->bio_cmd == BIO_READ);
boolean_t sync;
if (zv == NULL) {
g_io_deliver(bp, ENXIO);
return (0);
}
if (bp->bio_cmd != BIO_READ && (zv->zv_flags & ZVOL_RDONLY)) {
g_io_deliver(bp, EROFS);
return (0);
}
off = bp->bio_offset;
volsize = zv->zv_volsize;
os = zv->zv_objset;
ASSERT(os != NULL);
addr = bp->bio_data;
resid = bp->bio_length;
if (resid > 0 && (off < 0 || off >= volsize)) {
g_io_deliver(bp, EIO);
return (0);
}
sync = !doread && zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS;
/*
* There must be no buffer changes when doing a dmu_sync() because
* we can't change the data whilst calculating the checksum.
*/
rl = zfs_range_lock(&zv->zv_znode, off, resid,
doread ? RL_READER : RL_WRITER);
while (resid != 0 && off < volsize) {
size_t size = MIN(resid, zvol_maxphys);
if (doread) {
error = dmu_read(os, ZVOL_OBJ, off, size, addr,
DMU_READ_PREFETCH);
} else {
dmu_tx_t *tx = dmu_tx_create(os);
dmu_tx_hold_write(tx, ZVOL_OBJ, off, size);
error = dmu_tx_assign(tx, TXG_WAIT);
if (error) {
dmu_tx_abort(tx);
} else {
dmu_write(os, ZVOL_OBJ, off, size, addr, tx);
zvol_log_write(zv, tx, off, size, sync);
dmu_tx_commit(tx);
}
}
if (error) {
/* convert checksum errors into IO errors */
if (error == ECKSUM)
error = EIO;
break;
}
off += size;
addr += size;
resid -= size;
}
zfs_range_unlock(rl);
bp->bio_completed = bp->bio_length - resid;
if (bp->bio_completed < bp->bio_length)
bp->bio_error = (off > volsize ? EINVAL : error);
if (sync)
zil_commit(zv->zv_zilog, ZVOL_OBJ);
g_io_deliver(bp, 0);
return (0);
}
#ifdef sun
/*
* Set the buffer count to the zvol maximum transfer.
* Using our own routine instead of the default minphys()
* means that for larger writes we write bigger buffers on X86
* (128K instead of 56K) and flush the disk write cache less often
* (every zvol_maxphys - currently 1MB) instead of minphys (currently
* 56K on X86 and 128K on sparc).
*/
void
zvol_minphys(struct buf *bp)
{
if (bp->b_bcount > zvol_maxphys)
bp->b_bcount = zvol_maxphys;
}
int
zvol_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblocks)
{
minor_t minor = getminor(dev);
zvol_state_t *zv;
int error = 0;
uint64_t size;
uint64_t boff;
uint64_t resid;
zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
if (zv == NULL)
return (ENXIO);
boff = ldbtob(blkno);
resid = ldbtob(nblocks);
VERIFY3U(boff + resid, <=, zv->zv_volsize);
while (resid) {
size = MIN(resid, P2END(boff, zv->zv_volblocksize) - boff);
error = zvol_dumpio(zv, addr, boff, size, B_FALSE, B_TRUE);
if (error)
break;
boff += size;
addr += size;
resid -= size;
}
return (error);
}
/*ARGSUSED*/
int
zvol_read(dev_t dev, uio_t *uio, cred_t *cr)
{
minor_t minor = getminor(dev);
zvol_state_t *zv;
uint64_t volsize;
rl_t *rl;
int error = 0;
zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
if (zv == NULL)
return (ENXIO);
volsize = zv->zv_volsize;
if (uio->uio_resid > 0 &&
(uio->uio_loffset < 0 || uio->uio_loffset >= volsize))
return (EIO);
if (zv->zv_flags & ZVOL_DUMPIFIED) {
error = physio(zvol_strategy, NULL, dev, B_READ,
zvol_minphys, uio);
return (error);
}
rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid,
RL_READER);
while (uio->uio_resid > 0 && uio->uio_loffset < volsize) {
uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1);
/* don't read past the end */
if (bytes > volsize - uio->uio_loffset)
bytes = volsize - uio->uio_loffset;
error = dmu_read_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes);
if (error) {
/* convert checksum errors into IO errors */
if (error == ECKSUM)
error = EIO;
break;
}
}
zfs_range_unlock(rl);
return (error);
}
/*ARGSUSED*/
int
zvol_write(dev_t dev, uio_t *uio, cred_t *cr)
{
minor_t minor = getminor(dev);
zvol_state_t *zv;
uint64_t volsize;
rl_t *rl;
int error = 0;
boolean_t sync;
zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
if (zv == NULL)
return (ENXIO);
volsize = zv->zv_volsize;
if (uio->uio_resid > 0 &&
(uio->uio_loffset < 0 || uio->uio_loffset >= volsize))
return (EIO);
if (zv->zv_flags & ZVOL_DUMPIFIED) {
error = physio(zvol_strategy, NULL, dev, B_WRITE,
zvol_minphys, uio);
return (error);
}
sync = !(zv->zv_flags & ZVOL_WCE) ||
(zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS);
rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid,
RL_WRITER);
while (uio->uio_resid > 0 && uio->uio_loffset < volsize) {
uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1);
uint64_t off = uio->uio_loffset;
dmu_tx_t *tx = dmu_tx_create(zv->zv_objset);
if (bytes > volsize - off) /* don't write past the end */
bytes = volsize - off;
dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes);
error = dmu_tx_assign(tx, TXG_WAIT);
if (error) {
dmu_tx_abort(tx);
break;
}
error = dmu_write_uio_dbuf(zv->zv_dbuf, uio, bytes, tx);
if (error == 0)
zvol_log_write(zv, tx, off, bytes, sync);
dmu_tx_commit(tx);
if (error)
break;
}
zfs_range_unlock(rl);
if (sync)
zil_commit(zv->zv_zilog, ZVOL_OBJ);
return (error);
}
int
zvol_getefi(void *arg, int flag, uint64_t vs, uint8_t bs)
{
struct uuid uuid = EFI_RESERVED;
efi_gpe_t gpe = { 0 };
uint32_t crc;
dk_efi_t efi;
int length;
char *ptr;
if (ddi_copyin(arg, &efi, sizeof (dk_efi_t), flag))
return (EFAULT);
ptr = (char *)(uintptr_t)efi.dki_data_64;
length = efi.dki_length;
/*
* Some clients may attempt to request a PMBR for the
* zvol. Currently this interface will return EINVAL to
* such requests. These requests could be supported by
* adding a check for lba == 0 and consing up an appropriate
* PMBR.
*/
if (efi.dki_lba < 1 || efi.dki_lba > 2 || length <= 0)
return (EINVAL);
gpe.efi_gpe_StartingLBA = LE_64(34ULL);
gpe.efi_gpe_EndingLBA = LE_64((vs >> bs) - 1);
UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid);
if (efi.dki_lba == 1) {
efi_gpt_t gpt = { 0 };
gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE);
gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT);
gpt.efi_gpt_HeaderSize = LE_32(sizeof (gpt));
gpt.efi_gpt_MyLBA = LE_64(1ULL);
gpt.efi_gpt_FirstUsableLBA = LE_64(34ULL);
gpt.efi_gpt_LastUsableLBA = LE_64((vs >> bs) - 1);
gpt.efi_gpt_PartitionEntryLBA = LE_64(2ULL);
gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1);
gpt.efi_gpt_SizeOfPartitionEntry =
LE_32(sizeof (efi_gpe_t));
CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table);
gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc);
CRC32(crc, &gpt, sizeof (gpt), -1U, crc32_table);
gpt.efi_gpt_HeaderCRC32 = LE_32(~crc);
if (ddi_copyout(&gpt, ptr, MIN(sizeof (gpt), length),
flag))
return (EFAULT);
ptr += sizeof (gpt);
length -= sizeof (gpt);
}
if (length > 0 && ddi_copyout(&gpe, ptr, MIN(sizeof (gpe),
length), flag))
return (EFAULT);
return (0);
}
/*
* BEGIN entry points to allow external callers access to the volume.
*/
/*
* Return the volume parameters needed for access from an external caller.
* These values are invariant as long as the volume is held open.
*/
int
zvol_get_volume_params(minor_t minor, uint64_t *blksize,
uint64_t *max_xfer_len, void **minor_hdl, void **objset_hdl, void **zil_hdl,
void **rl_hdl, void **bonus_hdl)
{
zvol_state_t *zv;
zv = zfsdev_get_soft_state(minor, ZSST_ZVOL);
if (zv == NULL)
return (ENXIO);
if (zv->zv_flags & ZVOL_DUMPIFIED)
return (ENXIO);
ASSERT(blksize && max_xfer_len && minor_hdl &&
objset_hdl && zil_hdl && rl_hdl && bonus_hdl);
*blksize = zv->zv_volblocksize;
*max_xfer_len = (uint64_t)zvol_maxphys;
*minor_hdl = zv;
*objset_hdl = zv->zv_objset;
*zil_hdl = zv->zv_zilog;
*rl_hdl = &zv->zv_znode;
*bonus_hdl = zv->zv_dbuf;
return (0);
}
/*
* Return the current volume size to an external caller.
* The size can change while the volume is open.
*/
uint64_t
zvol_get_volume_size(void *minor_hdl)
{
zvol_state_t *zv = minor_hdl;
return (zv->zv_volsize);
}
/*
* Return the current WCE setting to an external caller.
* The WCE setting can change while the volume is open.
*/
int
zvol_get_volume_wce(void *minor_hdl)
{
zvol_state_t *zv = minor_hdl;
return ((zv->zv_flags & ZVOL_WCE) ? 1 : 0);
}
/*
* Entry point for external callers to zvol_log_write
*/
void
zvol_log_write_minor(void *minor_hdl, dmu_tx_t *tx, offset_t off, ssize_t resid,
boolean_t sync)
{
zvol_state_t *zv = minor_hdl;
zvol_log_write(zv, tx, off, resid, sync);
}
/*
* END entry points to allow external callers access to the volume.
*/
/*
* Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I).
*/
/*ARGSUSED*/
int
zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp)
{
zvol_state_t *zv;
struct dk_cinfo dki;
struct dk_minfo dkm;
struct dk_callback *dkc;
int error = 0;
rl_t *rl;
mutex_enter(&spa_namespace_lock);
zv = zfsdev_get_soft_state(getminor(dev), ZSST_ZVOL);
if (zv == NULL) {
mutex_exit(&spa_namespace_lock);
return (ENXIO);
}
ASSERT(zv->zv_total_opens > 0);
switch (cmd) {
case DKIOCINFO:
bzero(&dki, sizeof (dki));
(void) strcpy(dki.dki_cname, "zvol");
(void) strcpy(dki.dki_dname, "zvol");
dki.dki_ctype = DKC_UNKNOWN;
dki.dki_unit = getminor(dev);
dki.dki_maxtransfer = 1 << (SPA_MAXBLOCKSHIFT - zv->zv_min_bs);
mutex_exit(&spa_namespace_lock);
if (ddi_copyout(&dki, (void *)arg, sizeof (dki), flag))
error = EFAULT;
return (error);
case DKIOCGMEDIAINFO:
bzero(&dkm, sizeof (dkm));
dkm.dki_lbsize = 1U << zv->zv_min_bs;
dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs;
dkm.dki_media_type = DK_UNKNOWN;
mutex_exit(&spa_namespace_lock);
if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag))
error = EFAULT;
return (error);
case DKIOCGETEFI:
{
uint64_t vs = zv->zv_volsize;
uint8_t bs = zv->zv_min_bs;
mutex_exit(&spa_namespace_lock);
error = zvol_getefi((void *)arg, flag, vs, bs);
return (error);
}
case DKIOCFLUSHWRITECACHE:
dkc = (struct dk_callback *)arg;
mutex_exit(&spa_namespace_lock);
zil_commit(zv->zv_zilog, ZVOL_OBJ);
if ((flag & FKIOCTL) && dkc != NULL && dkc->dkc_callback) {
(*dkc->dkc_callback)(dkc->dkc_cookie, error);
error = 0;
}
return (error);
case DKIOCGETWCE:
{
int wce = (zv->zv_flags & ZVOL_WCE) ? 1 : 0;
if (ddi_copyout(&wce, (void *)arg, sizeof (int),
flag))
error = EFAULT;
break;
}
case DKIOCSETWCE:
{
int wce;
if (ddi_copyin((void *)arg, &wce, sizeof (int),
flag)) {
error = EFAULT;
break;
}
if (wce) {
zv->zv_flags |= ZVOL_WCE;
mutex_exit(&spa_namespace_lock);
} else {
zv->zv_flags &= ~ZVOL_WCE;
mutex_exit(&spa_namespace_lock);
zil_commit(zv->zv_zilog, ZVOL_OBJ);
}
return (0);
}
case DKIOCGGEOM:
case DKIOCGVTOC:
/*
* commands using these (like prtvtoc) expect ENOTSUP
* since we're emulating an EFI label
*/
error = ENOTSUP;
break;
case DKIOCDUMPINIT:
rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize,
RL_WRITER);
error = zvol_dumpify(zv);
zfs_range_unlock(rl);
break;
case DKIOCDUMPFINI:
if (!(zv->zv_flags & ZVOL_DUMPIFIED))
break;
rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize,
RL_WRITER);
error = zvol_dump_fini(zv);
zfs_range_unlock(rl);
break;
default:
error = ENOTTY;
break;
}
mutex_exit(&spa_namespace_lock);
return (error);
}
#endif /* sun */
int
zvol_busy(void)
{
return (zvol_minors != 0);
}
void
zvol_init(void)
{
VERIFY(ddi_soft_state_init(&zfsdev_state, sizeof (zfs_soft_state_t),
1) == 0);
ZFS_LOG(1, "ZVOL Initialized.");
}
void
zvol_fini(void)
{
ddi_soft_state_fini(&zfsdev_state);
ZFS_LOG(1, "ZVOL Deinitialized.");
}
#ifdef sun
static int
zvol_dump_init(zvol_state_t *zv, boolean_t resize)
{
dmu_tx_t *tx;
int error = 0;
objset_t *os = zv->zv_objset;
nvlist_t *nv = NULL;
uint64_t version = spa_version(dmu_objset_spa(zv->zv_objset));
ASSERT(MUTEX_HELD(&spa_namespace_lock));
error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, 0,
DMU_OBJECT_END);
/* wait for dmu_free_long_range to actually free the blocks */
txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0);
tx = dmu_tx_create(os);
dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
dmu_tx_hold_bonus(tx, ZVOL_OBJ);
error = dmu_tx_assign(tx, TXG_WAIT);
if (error) {
dmu_tx_abort(tx);
return (error);
}
/*
* If we are resizing the dump device then we only need to
* update the refreservation to match the newly updated
* zvolsize. Otherwise, we save off the original state of the
* zvol so that we can restore them if the zvol is ever undumpified.
*/
if (resize) {
error = zap_update(os, ZVOL_ZAP_OBJ,
zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1,
&zv->zv_volsize, tx);
} else {
uint64_t checksum, compress, refresrv, vbs, dedup;
error = dsl_prop_get_integer(zv->zv_name,
zfs_prop_to_name(ZFS_PROP_COMPRESSION), &compress, NULL);
error = error ? error : dsl_prop_get_integer(zv->zv_name,
zfs_prop_to_name(ZFS_PROP_CHECKSUM), &checksum, NULL);
error = error ? error : dsl_prop_get_integer(zv->zv_name,
zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &refresrv, NULL);
error = error ? error : dsl_prop_get_integer(zv->zv_name,
zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &vbs, NULL);
if (version >= SPA_VERSION_DEDUP) {
error = error ? error :
dsl_prop_get_integer(zv->zv_name,
zfs_prop_to_name(ZFS_PROP_DEDUP), &dedup, NULL);
}
error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1,
&compress, tx);
error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum, tx);
error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1,
&refresrv, tx);
error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1,
&vbs, tx);
error = error ? error : dmu_object_set_blocksize(
os, ZVOL_OBJ, SPA_MAXBLOCKSIZE, 0, tx);
if (version >= SPA_VERSION_DEDUP) {
error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1,
&dedup, tx);
}
if (error == 0)
zv->zv_volblocksize = SPA_MAXBLOCKSIZE;
}
dmu_tx_commit(tx);
/*
* We only need update the zvol's property if we are initializing
* the dump area for the first time.
*/
if (!resize) {
VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0);
VERIFY(nvlist_add_uint64(nv,
zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 0) == 0);
VERIFY(nvlist_add_uint64(nv,
zfs_prop_to_name(ZFS_PROP_COMPRESSION),
ZIO_COMPRESS_OFF) == 0);
VERIFY(nvlist_add_uint64(nv,
zfs_prop_to_name(ZFS_PROP_CHECKSUM),
ZIO_CHECKSUM_OFF) == 0);
if (version >= SPA_VERSION_DEDUP) {
VERIFY(nvlist_add_uint64(nv,
zfs_prop_to_name(ZFS_PROP_DEDUP),
ZIO_CHECKSUM_OFF) == 0);
}
error = zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL,
nv, NULL);
nvlist_free(nv);
if (error)
return (error);
}
/* Allocate the space for the dump */
error = zvol_prealloc(zv);
return (error);
}
static int
zvol_dumpify(zvol_state_t *zv)
{
int error = 0;
uint64_t dumpsize = 0;
dmu_tx_t *tx;
objset_t *os = zv->zv_objset;
if (zv->zv_flags & ZVOL_RDONLY)
return (EROFS);
if (zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE,
8, 1, &dumpsize) != 0 || dumpsize != zv->zv_volsize) {
boolean_t resize = (dumpsize > 0) ? B_TRUE : B_FALSE;
if ((error = zvol_dump_init(zv, resize)) != 0) {
(void) zvol_dump_fini(zv);
return (error);
}
}
/*
* Build up our lba mapping.
*/
error = zvol_get_lbas(zv);
if (error) {
(void) zvol_dump_fini(zv);
return (error);
}
tx = dmu_tx_create(os);
dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
error = dmu_tx_assign(tx, TXG_WAIT);
if (error) {
dmu_tx_abort(tx);
(void) zvol_dump_fini(zv);
return (error);
}
zv->zv_flags |= ZVOL_DUMPIFIED;
error = zap_update(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 8, 1,
&zv->zv_volsize, tx);
dmu_tx_commit(tx);
if (error) {
(void) zvol_dump_fini(zv);
return (error);
}
txg_wait_synced(dmu_objset_pool(os), 0);
return (0);
}
static int
zvol_dump_fini(zvol_state_t *zv)
{
dmu_tx_t *tx;
objset_t *os = zv->zv_objset;
nvlist_t *nv;
int error = 0;
uint64_t checksum, compress, refresrv, vbs, dedup;
uint64_t version = spa_version(dmu_objset_spa(zv->zv_objset));
/*
* Attempt to restore the zvol back to its pre-dumpified state.
* This is a best-effort attempt as it's possible that not all
* of these properties were initialized during the dumpify process
* (i.e. error during zvol_dump_init).
*/
tx = dmu_tx_create(os);
dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
error = dmu_tx_assign(tx, TXG_WAIT);
if (error) {
dmu_tx_abort(tx);
return (error);
}
(void) zap_remove(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, tx);
dmu_tx_commit(tx);
(void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum);
(void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, &compress);
(void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, &refresrv);
(void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, &vbs);
VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0);
(void) nvlist_add_uint64(nv,
zfs_prop_to_name(ZFS_PROP_CHECKSUM), checksum);
(void) nvlist_add_uint64(nv,
zfs_prop_to_name(ZFS_PROP_COMPRESSION), compress);
(void) nvlist_add_uint64(nv,
zfs_prop_to_name(ZFS_PROP_REFRESERVATION), refresrv);
if (version >= SPA_VERSION_DEDUP &&
zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1, &dedup) == 0) {
(void) nvlist_add_uint64(nv,
zfs_prop_to_name(ZFS_PROP_DEDUP), dedup);
}
(void) zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL,
nv, NULL);
nvlist_free(nv);
zvol_free_extents(zv);
zv->zv_flags &= ~ZVOL_DUMPIFIED;
(void) dmu_free_long_range(os, ZVOL_OBJ, 0, DMU_OBJECT_END);
/* wait for dmu_free_long_range to actually free the blocks */
txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0);
tx = dmu_tx_create(os);
dmu_tx_hold_bonus(tx, ZVOL_OBJ);
error = dmu_tx_assign(tx, TXG_WAIT);
if (error) {
dmu_tx_abort(tx);
return (error);
}
if (dmu_object_set_blocksize(os, ZVOL_OBJ, vbs, 0, tx) == 0)
zv->zv_volblocksize = vbs;
dmu_tx_commit(tx);
return (0);
}
#endif /* sun */
static zvol_state_t *
zvol_geom_create(const char *name)
{
struct g_provider *pp;
struct g_geom *gp;
zvol_state_t *zv;
gp = g_new_geomf(&zfs_zvol_class, "zfs::zvol::%s", name);
gp->start = zvol_geom_start;
gp->access = zvol_geom_access;
pp = g_new_providerf(gp, "%s/%s", ZVOL_DRIVER, name);
pp->sectorsize = DEV_BSIZE;
zv = kmem_zalloc(sizeof(*zv), KM_SLEEP);
zv->zv_provider = pp;
zv->zv_state = 0;
bioq_init(&zv->zv_queue);
mtx_init(&zv->zv_queue_mtx, "zvol", NULL, MTX_DEF);
pp->private = zv;
return (zv);
}
static void
zvol_geom_run(zvol_state_t *zv)
{
struct g_provider *pp;
pp = zv->zv_provider;
g_error_provider(pp, 0);
kproc_kthread_add(zvol_geom_worker, zv, &zfsproc, NULL, 0, 0,
"zfskern", "zvol %s", pp->name + sizeof(ZVOL_DRIVER));
}
static void
zvol_geom_destroy(zvol_state_t *zv)
{
struct g_provider *pp;
g_topology_assert();
mtx_lock(&zv->zv_queue_mtx);
zv->zv_state = 1;
wakeup_one(&zv->zv_queue);
while (zv->zv_state != 2)
msleep(&zv->zv_state, &zv->zv_queue_mtx, 0, "zvol:w", 0);
mtx_destroy(&zv->zv_queue_mtx);
pp = zv->zv_provider;
zv->zv_provider = NULL;
pp->private = NULL;
g_wither_geom(pp->geom, ENXIO);
kmem_free(zv, sizeof(*zv));
}
static int
zvol_geom_access(struct g_provider *pp, int acr, int acw, int ace)
{
int count, error, flags;
g_topology_assert();
/*
* To make it easier we expect either open or close, but not both
* at the same time.
*/
KASSERT((acr >= 0 && acw >= 0 && ace >= 0) ||
(acr <= 0 && acw <= 0 && ace <= 0),
("Unsupported access request to %s (acr=%d, acw=%d, ace=%d).",
pp->name, acr, acw, ace));
if (pp->private == NULL) {
if (acr <= 0 && acw <= 0 && ace <= 0)
return (0);
return (pp->error);
}
/*
* We don't pass FEXCL flag to zvol_open()/zvol_close() if ace != 0,
* because GEOM already handles that and handles it a bit differently.
* GEOM allows for multiple read/exclusive consumers and ZFS allows
* only one exclusive consumer, no matter if it is reader or writer.
* I like better the way GEOM works so I'll leave it for GEOM to
* decide what to do.
*/
count = acr + acw + ace;
if (count == 0)
return (0);
flags = 0;
if (acr != 0 || ace != 0)
flags |= FREAD;
if (acw != 0)
flags |= FWRITE;
g_topology_unlock();
if (count > 0)
error = zvol_open(pp, flags, count);
else
error = zvol_close(pp, flags, -count);
g_topology_lock();
return (error);
}
static void
zvol_geom_start(struct bio *bp)
{
zvol_state_t *zv;
boolean_t first;
switch (bp->bio_cmd) {
case BIO_READ:
case BIO_WRITE:
case BIO_FLUSH:
zv = bp->bio_to->private;
ASSERT(zv != NULL);
mtx_lock(&zv->zv_queue_mtx);
first = (bioq_first(&zv->zv_queue) == NULL);
bioq_insert_tail(&zv->zv_queue, bp);
mtx_unlock(&zv->zv_queue_mtx);
if (first)
wakeup_one(&zv->zv_queue);
break;
case BIO_GETATTR:
case BIO_DELETE:
default:
g_io_deliver(bp, EOPNOTSUPP);
break;
}
}
static void
zvol_geom_worker(void *arg)
{
zvol_state_t *zv;
struct bio *bp;
thread_lock(curthread);
sched_prio(curthread, PRIBIO);
thread_unlock(curthread);
zv = arg;
for (;;) {
mtx_lock(&zv->zv_queue_mtx);
bp = bioq_takefirst(&zv->zv_queue);
if (bp == NULL) {
if (zv->zv_state == 1) {
zv->zv_state = 2;
wakeup(&zv->zv_state);
mtx_unlock(&zv->zv_queue_mtx);
kthread_exit();
}
msleep(&zv->zv_queue, &zv->zv_queue_mtx, PRIBIO | PDROP,
"zvol:io", 0);
continue;
}
mtx_unlock(&zv->zv_queue_mtx);
switch (bp->bio_cmd) {
case BIO_FLUSH:
zil_commit(zv->zv_zilog, ZVOL_OBJ);
g_io_deliver(bp, 0);
break;
case BIO_READ:
case BIO_WRITE:
zvol_strategy(bp);
break;
}
}
}
extern boolean_t dataset_name_hidden(const char *name);
static int
zvol_create_snapshots(objset_t *os, const char *name)
{
uint64_t cookie, obj;
char *sname;
int error, len;
cookie = obj = 0;
sname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
(void) dmu_objset_find(name, dmu_objset_prefetch, NULL,
DS_FIND_SNAPSHOTS);
for (;;) {
len = snprintf(sname, MAXPATHLEN, "%s@", name);
if (len >= MAXPATHLEN) {
dmu_objset_rele(os, FTAG);
error = ENAMETOOLONG;
break;
}
error = dmu_snapshot_list_next(os, MAXPATHLEN - len,
sname + len, &obj, &cookie, NULL);
if (error != 0) {
if (error == ENOENT)
error = 0;
break;
}
if ((error = zvol_create_minor(sname)) != 0) {
printf("ZFS WARNING: Unable to create ZVOL %s (error=%d).\n",
sname, error);
break;
}
}
kmem_free(sname, MAXPATHLEN);
return (error);
}
int
zvol_create_minors(const char *name)
{
uint64_t cookie;
objset_t *os;
char *osname, *p;
int error, len;
if (dataset_name_hidden(name))
return (0);
if ((error = dmu_objset_hold(name, FTAG, &os)) != 0) {
printf("ZFS WARNING: Unable to put hold on %s (error=%d).\n",
name, error);
return (error);
}
if (dmu_objset_type(os) == DMU_OST_ZVOL) {
if ((error = zvol_create_minor(name)) == 0)
error = zvol_create_snapshots(os, name);
else {
printf("ZFS WARNING: Unable to create ZVOL %s (error=%d).\n",
name, error);
}
dmu_objset_rele(os, FTAG);
return (error);
}
if (dmu_objset_type(os) != DMU_OST_ZFS) {
dmu_objset_rele(os, FTAG);
return (0);
}
osname = kmem_alloc(MAXPATHLEN, KM_SLEEP);
if (snprintf(osname, MAXPATHLEN, "%s/", name) >= MAXPATHLEN) {
dmu_objset_rele(os, FTAG);
kmem_free(osname, MAXPATHLEN);
return (ENOENT);
}
p = osname + strlen(osname);
len = MAXPATHLEN - (p - osname);
/* Prefetch the datasets. */
cookie = 0;
while (dmu_dir_list_next(os, len, p, NULL, &cookie) == 0) {
if (!dataset_name_hidden(osname))
(void) dmu_objset_prefetch(osname, NULL);
}
cookie = 0;
while (dmu_dir_list_next(os, MAXPATHLEN - (p - osname), p, NULL,
&cookie) == 0) {
dmu_objset_rele(os, FTAG);
(void)zvol_create_minors(osname);
if ((error = dmu_objset_hold(name, FTAG, &os)) != 0) {
printf("ZFS WARNING: Unable to put hold on %s (error=%d).\n",
name, error);
return (error);
}
}
dmu_objset_rele(os, FTAG);
kmem_free(osname, MAXPATHLEN);
return (0);
}
static void
zvol_rename_minor(struct g_geom *gp, const char *newname)
{
struct g_provider *pp;
zvol_state_t *zv;
ASSERT(MUTEX_HELD(&spa_namespace_lock));
g_topology_assert();
pp = LIST_FIRST(&gp->provider);
ASSERT(pp != NULL);
zv = pp->private;
ASSERT(zv != NULL);
zv->zv_provider = NULL;
g_wither_provider(pp, ENXIO);
pp = g_new_providerf(gp, "%s/%s", ZVOL_DRIVER, newname);
pp->sectorsize = DEV_BSIZE;
pp->mediasize = zv->zv_volsize;
pp->private = zv;
zv->zv_provider = pp;
strlcpy(zv->zv_name, newname, sizeof(zv->zv_name));
g_error_provider(pp, 0);
}
void
zvol_rename_minors(const char *oldname, const char *newname)
{
char name[MAXPATHLEN];
struct g_provider *pp;
struct g_geom *gp;
size_t oldnamelen, newnamelen;
zvol_state_t *zv;
char *namebuf;
oldnamelen = strlen(oldname);
newnamelen = strlen(newname);
DROP_GIANT();
mutex_enter(&spa_namespace_lock);
g_topology_lock();
LIST_FOREACH(gp, &zfs_zvol_class.geom, geom) {
pp = LIST_FIRST(&gp->provider);
if (pp == NULL)
continue;
zv = pp->private;
if (zv == NULL)
continue;
if (strcmp(zv->zv_name, oldname) == 0) {
zvol_rename_minor(gp, newname);
} else if (strncmp(zv->zv_name, oldname, oldnamelen) == 0 &&
(zv->zv_name[oldnamelen] == '/' ||
zv->zv_name[oldnamelen] == '@')) {
snprintf(name, sizeof(name), "%s%c%s", newname,
zv->zv_name[oldnamelen],
zv->zv_name + oldnamelen + 1);
zvol_rename_minor(gp, name);
}
}
g_topology_unlock();
mutex_exit(&spa_namespace_lock);
PICKUP_GIANT();
}