+++ /dev/null
-/*
- * 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 2009 Sun Microsystems, Inc. All rights reserved.
- * Use is subject to license terms.
- */
-
-/*
- * 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 ZFS-specific devfsadm link generator.
- * Volumes are persistent through reboot. No user command needs to be
- * run before opening and using a device.
- */
-
-#include <sys/types.h>
-#include <sys/param.h>
-#include <sys/errno.h>
-#include <sys/uio.h>
-#include <sys/buf.h>
-#include <sys/modctl.h>
-#include <sys/open.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/efi_partition.h>
-#include <sys/byteorder.h>
-#include <sys/pathname.h>
-#include <sys/ddi.h>
-#include <sys/sunddi.h>
-#include <sys/crc32.h>
-#include <sys/dirent.h>
-#include <sys/policy.h>
-#include <sys/fs/zfs.h>
-#include <sys/zfs_ioctl.h>
-#include <sys/mkdev.h>
-#include <sys/zil.h>
-#include <sys/refcount.h>
-#include <sys/zfs_znode.h>
-#include <sys/zfs_rlock.h>
-#include <sys/vdev_disk.h>
-#include <sys/vdev_impl.h>
-#include <sys/zvol.h>
-#include <sys/dumphdr.h>
-#include <sys/zil_impl.h>
-
-#include "zfs_namecheck.h"
-
-static void *zvol_state;
-
-#define ZVOL_DUMPSIZE "dumpsize"
-
-/*
- * This lock protects the zvol_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 kmutex_t zvol_state_lock;
-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 */
- minor_t zv_minor; /* minor number */
- 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_mode; /* DS_MODE_* flags at open time */
- uint32_t zv_open_count[OTYPCNT]; /* open counts */
- 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 */
-} 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 *, nvlist_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 void
-zvol_size_changed(zvol_state_t *zv, major_t maj)
-{
- dev_t dev = makedevice(maj, zv->zv_minor);
-
- VERIFY(ddi_prop_update_int64(dev, zfs_dip,
- "Size", zv->zv_volsize) == DDI_SUCCESS);
- VERIFY(ddi_prop_update_int64(dev, zfs_dip,
- "Nblocks", lbtodb(zv->zv_volsize)) == DDI_SUCCESS);
-
- /* Notify specfs to invalidate the cached size */
- spec_size_invalidate(dev, VBLK);
- spec_size_invalidate(dev, VCHR);
-}
-
-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);
-}
-
-static void
-zvol_readonly_changed_cb(void *arg, uint64_t newval)
-{
- zvol_state_t *zv = arg;
-
- if (newval)
- zv->zv_flags |= ZVOL_RDONLY;
- else
- zv->zv_flags &= ~ZVOL_RDONLY;
-}
-
-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);
-}
-
-/*
- * Find a free minor number.
- */
-static minor_t
-zvol_minor_alloc(void)
-{
- minor_t minor;
-
- ASSERT(MUTEX_HELD(&zvol_state_lock));
-
- for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++)
- if (ddi_get_soft_state(zvol_state, minor) == NULL)
- return (minor);
-
- return (0);
-}
-
-static zvol_state_t *
-zvol_minor_lookup(const char *name)
-{
- minor_t minor;
- zvol_state_t *zv;
-
- ASSERT(MUTEX_HELD(&zvol_state_lock));
-
- for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++) {
- zv = ddi_get_soft_state(zvol_state, minor);
- if (zv == NULL)
- continue;
- if (strcmp(zv->zv_name, name) == 0)
- break;
- }
-
- return (zv);
-}
-
-/* extent mapping arg */
-struct maparg {
- zvol_state_t *ma_zv;
- uint64_t ma_blks;
-};
-
-/*ARGSUSED*/
-static int
-zvol_map_block(spa_t *spa, blkptr_t *bp, 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)
-{
- struct maparg ma;
- int err;
-
- ma.ma_zv = zv;
- ma.ma_blks = 0;
- zvol_free_extents(zv);
-
- err = traverse_dataset(dmu_objset_ds(zv->zv_objset), 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 off = lr->lr_offset;
- uint64_t len = lr->lr_length;
- dmu_tx_t *tx;
- int error;
-
- if (byteswap)
- byteswap_uint64_array(lr, sizeof (*lr));
-
- tx = dmu_tx_create(os);
- dmu_tx_hold_write(tx, ZVOL_OBJ, off, len);
- error = dmu_tx_assign(tx, TXG_WAIT);
- if (error) {
- dmu_tx_abort(tx);
- } else {
- dmu_write(os, ZVOL_OBJ, off, len, 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 */
-};
-
-/*
- * Create a minor node (plus a whole lot more) for the specified volume.
- */
-int
-zvol_create_minor(const char *name, major_t maj)
-{
- zvol_state_t *zv;
- objset_t *os;
- dmu_object_info_t doi;
- uint64_t volsize;
- minor_t minor = 0;
- struct pathname linkpath;
- int ds_mode = DS_MODE_OWNER;
- vnode_t *vp = NULL;
- char *devpath;
- size_t devpathlen = strlen(ZVOL_FULL_DEV_DIR) + strlen(name) + 1;
- char chrbuf[30], blkbuf[30];
- int error;
-
- mutex_enter(&zvol_state_lock);
-
- if ((zv = zvol_minor_lookup(name)) != NULL) {
- mutex_exit(&zvol_state_lock);
- return (EEXIST);
- }
-
- if (strchr(name, '@') != 0)
- ds_mode |= DS_MODE_READONLY;
-
- error = dmu_objset_open(name, DMU_OST_ZVOL, ds_mode, &os);
-
- if (error) {
- mutex_exit(&zvol_state_lock);
- return (error);
- }
-
- error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize);
-
- if (error) {
- dmu_objset_close(os);
- mutex_exit(&zvol_state_lock);
- return (error);
- }
-
- /*
- * If there's an existing /dev/zvol symlink, try to use the
- * same minor number we used last time.
- */
- devpath = kmem_alloc(devpathlen, KM_SLEEP);
-
- (void) sprintf(devpath, "%s%s", ZVOL_FULL_DEV_DIR, name);
-
- error = lookupname(devpath, UIO_SYSSPACE, NO_FOLLOW, NULL, &vp);
-
- kmem_free(devpath, devpathlen);
-
- if (error == 0 && vp->v_type != VLNK)
- error = EINVAL;
-
- if (error == 0) {
- pn_alloc(&linkpath);
- error = pn_getsymlink(vp, &linkpath, kcred);
- if (error == 0) {
- char *ms = strstr(linkpath.pn_path, ZVOL_PSEUDO_DEV);
- if (ms != NULL) {
- ms += strlen(ZVOL_PSEUDO_DEV);
- minor = stoi(&ms);
- }
- }
- pn_free(&linkpath);
- }
-
- if (vp != NULL)
- VN_RELE(vp);
-
- /*
- * If we found a minor but it's already in use, we must pick a new one.
- */
- if (minor != 0 && ddi_get_soft_state(zvol_state, minor) != NULL)
- minor = 0;
-
- if (minor == 0)
- minor = zvol_minor_alloc();
-
- if (minor == 0) {
- dmu_objset_close(os);
- mutex_exit(&zvol_state_lock);
- return (ENXIO);
- }
-
- if (ddi_soft_state_zalloc(zvol_state, minor) != DDI_SUCCESS) {
- dmu_objset_close(os);
- mutex_exit(&zvol_state_lock);
- return (EAGAIN);
- }
-
- (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME,
- (char *)name);
-
- (void) sprintf(chrbuf, "%uc,raw", minor);
-
- if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR,
- minor, DDI_PSEUDO, 0) == DDI_FAILURE) {
- ddi_soft_state_free(zvol_state, minor);
- dmu_objset_close(os);
- mutex_exit(&zvol_state_lock);
- return (EAGAIN);
- }
-
- (void) sprintf(blkbuf, "%uc", 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(zvol_state, minor);
- dmu_objset_close(os);
- mutex_exit(&zvol_state_lock);
- return (EAGAIN);
- }
-
- zv = ddi_get_soft_state(zvol_state, minor);
-
- (void) strcpy(zv->zv_name, name);
- zv->zv_min_bs = DEV_BSHIFT;
- zv->zv_minor = minor;
- zv->zv_volsize = volsize;
- zv->zv_objset = os;
- zv->zv_mode = ds_mode;
- zv->zv_zilog = zil_open(os, zvol_get_data);
- 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;
-
- zil_replay(os, zv, zvol_replay_vector);
- zvol_size_changed(zv, maj);
-
- /* XXX this should handle the possible i/o error */
- VERIFY(dsl_prop_register(dmu_objset_ds(zv->zv_objset),
- "readonly", zvol_readonly_changed_cb, zv) == 0);
-
- zvol_minors++;
-
- mutex_exit(&zvol_state_lock);
-
- return (0);
-}
-
-/*
- * Remove minor node for the specified volume.
- */
-int
-zvol_remove_minor(const char *name)
-{
- zvol_state_t *zv;
- char namebuf[30];
-
- mutex_enter(&zvol_state_lock);
-
- if ((zv = zvol_minor_lookup(name)) == NULL) {
- mutex_exit(&zvol_state_lock);
- return (ENXIO);
- }
-
- if (zv->zv_total_opens != 0) {
- mutex_exit(&zvol_state_lock);
- return (EBUSY);
- }
-
- (void) sprintf(namebuf, "%uc,raw", zv->zv_minor);
- ddi_remove_minor_node(zfs_dip, namebuf);
-
- (void) sprintf(namebuf, "%uc", zv->zv_minor);
- ddi_remove_minor_node(zfs_dip, namebuf);
-
- VERIFY(dsl_prop_unregister(dmu_objset_ds(zv->zv_objset),
- "readonly", zvol_readonly_changed_cb, zv) == 0);
-
- zil_close(zv->zv_zilog);
- zv->zv_zilog = NULL;
- dmu_objset_close(zv->zv_objset);
- zv->zv_objset = NULL;
- avl_destroy(&zv->zv_znode.z_range_avl);
- mutex_destroy(&zv->zv_znode.z_range_lock);
-
- ddi_soft_state_free(zvol_state, zv->zv_minor);
-
- zvol_minors--;
-
- mutex_exit(&zvol_state_lock);
-
- return (0);
-}
-
-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);
-}
-
-int
-zvol_update_volsize(zvol_state_t *zv, major_t maj, uint64_t volsize)
-{
- dmu_tx_t *tx;
- int error;
-
- ASSERT(MUTEX_HELD(&zvol_state_lock));
-
- tx = dmu_tx_create(zv->zv_objset);
- 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(zv->zv_objset, ZVOL_ZAP_OBJ, "size", 8, 1,
- &volsize, tx);
- dmu_tx_commit(tx);
-
- if (error == 0)
- error = dmu_free_long_range(zv->zv_objset,
- ZVOL_OBJ, volsize, DMU_OBJECT_END);
-
- /*
- * If we are using a faked-up state (zv_minor == 0) then don't
- * try to update the in-core zvol state.
- */
- if (error == 0 && zv->zv_minor) {
- zv->zv_volsize = volsize;
- zvol_size_changed(zv, maj);
- }
- return (error);
-}
-
-int
-zvol_set_volsize(const char *name, major_t maj, uint64_t volsize)
-{
- zvol_state_t *zv;
- int error;
- dmu_object_info_t doi;
- uint64_t old_volsize = 0ULL;
- zvol_state_t state = { 0 };
-
- mutex_enter(&zvol_state_lock);
-
- if ((zv = zvol_minor_lookup(name)) == NULL) {
- /*
- * If we are doing a "zfs clone -o volsize=", then the
- * minor node won't exist yet.
- */
- error = dmu_objset_open(name, DMU_OST_ZVOL, DS_MODE_OWNER,
- &state.zv_objset);
- if (error != 0)
- goto out;
- zv = &state;
- }
- old_volsize = zv->zv_volsize;
-
- if ((error = dmu_object_info(zv->zv_objset, ZVOL_OBJ, &doi)) != 0 ||
- (error = zvol_check_volsize(volsize,
- doi.doi_data_block_size)) != 0)
- goto out;
-
- if (zv->zv_flags & ZVOL_RDONLY || (zv->zv_mode & DS_MODE_READONLY)) {
- error = EROFS;
- goto out;
- }
-
- error = zvol_update_volsize(zv, maj, volsize);
-
- /*
- * Reinitialize the dump area to the new size. If we
- * failed to resize the dump area then restore the it back to
- * it's original size.
- */
- if (error == 0 && zv->zv_flags & ZVOL_DUMPIFIED) {
- if ((error = zvol_dumpify(zv)) != 0 ||
- (error = dumpvp_resize()) != 0) {
- (void) zvol_update_volsize(zv, maj, old_volsize);
- error = zvol_dumpify(zv);
- }
- }
-
- /*
- * Generate a LUN expansion event.
- */
- if (error == 0) {
- sysevent_id_t eid;
- nvlist_t *attr;
- char *physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP);
-
- (void) snprintf(physpath, MAXPATHLEN, "%s%uc", 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);
- }
-
-out:
- if (state.zv_objset)
- dmu_objset_close(state.zv_objset);
-
- mutex_exit(&zvol_state_lock);
-
- return (error);
-}
-
-int
-zvol_set_volblocksize(const char *name, uint64_t volblocksize)
-{
- zvol_state_t *zv;
- dmu_tx_t *tx;
- int error;
- boolean_t needlock;
-
- /*
- * The lock may already be held if we are being called from
- * zvol_dump_init().
- */
- needlock = !MUTEX_HELD(&zvol_state_lock);
- if (needlock)
- mutex_enter(&zvol_state_lock);
-
- if ((zv = zvol_minor_lookup(name)) == NULL) {
- if (needlock)
- mutex_exit(&zvol_state_lock);
- return (ENXIO);
- }
- if (zv->zv_flags & ZVOL_RDONLY || (zv->zv_mode & DS_MODE_READONLY)) {
- if (needlock)
- mutex_exit(&zvol_state_lock);
- return (EROFS);
- }
-
- tx = dmu_tx_create(zv->zv_objset);
- dmu_tx_hold_bonus(tx, ZVOL_OBJ);
- error = dmu_tx_assign(tx, TXG_WAIT);
- if (error) {
- dmu_tx_abort(tx);
- } else {
- error = dmu_object_set_blocksize(zv->zv_objset, ZVOL_OBJ,
- volblocksize, 0, tx);
- if (error == ENOTSUP)
- error = EBUSY;
- dmu_tx_commit(tx);
- if (error == 0)
- zv->zv_volblocksize = volblocksize;
- }
-
- if (needlock)
- mutex_exit(&zvol_state_lock);
-
- return (error);
-}
-
-/*ARGSUSED*/
-int
-zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr)
-{
- minor_t minor = getminor(*devp);
- zvol_state_t *zv;
-
- if (minor == 0) /* This is the control device */
- return (0);
-
- mutex_enter(&zvol_state_lock);
-
- zv = ddi_get_soft_state(zvol_state, minor);
- if (zv == NULL) {
- mutex_exit(&zvol_state_lock);
- return (ENXIO);
- }
-
- ASSERT(zv->zv_objset != NULL);
-
- if ((flag & FWRITE) &&
- (zv->zv_flags & ZVOL_RDONLY || (zv->zv_mode & DS_MODE_READONLY))) {
- mutex_exit(&zvol_state_lock);
- return (EROFS);
- }
- if (zv->zv_flags & ZVOL_EXCL) {
- mutex_exit(&zvol_state_lock);
- return (EBUSY);
- }
- if (flag & FEXCL) {
- if (zv->zv_total_opens != 0) {
- mutex_exit(&zvol_state_lock);
- return (EBUSY);
- }
- zv->zv_flags |= ZVOL_EXCL;
- }
-
- if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) {
- zv->zv_open_count[otyp]++;
- zv->zv_total_opens++;
- }
-
- mutex_exit(&zvol_state_lock);
-
- return (0);
-}
-
-/*ARGSUSED*/
-int
-zvol_close(dev_t dev, int flag, int otyp, cred_t *cr)
-{
- minor_t minor = getminor(dev);
- zvol_state_t *zv;
-
- if (minor == 0) /* This is the control device */
- return (0);
-
- mutex_enter(&zvol_state_lock);
-
- zv = ddi_get_soft_state(zvol_state, minor);
- if (zv == NULL) {
- mutex_exit(&zvol_state_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_open_count[otyp] != 0);
- ASSERT(zv->zv_total_opens != 0);
-
- /*
- * You may get multiple opens, but only one close.
- */
- zv->zv_open_count[otyp]--;
- zv->zv_total_opens--;
-
- mutex_exit(&zvol_state_lock);
-
- return (0);
-}
-
-static void
-zvol_get_done(dmu_buf_t *db, void *vzgd)
-{
- zgd_t *zgd = (zgd_t *)vzgd;
- rl_t *rl = zgd->zgd_rl;
-
- dmu_buf_rele(db, vzgd);
- zfs_range_unlock(rl);
- 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;
- dmu_buf_t *db;
- rl_t *rl;
- zgd_t *zgd;
- uint64_t boff; /* block starting offset */
- int dlen = lr->lr_length; /* length of user data */
- int error;
-
- ASSERT(zio);
- ASSERT(dlen != 0);
-
- /*
- * 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 */
- return (dmu_read(os, ZVOL_OBJ, lr->lr_offset, dlen, buf,
- DMU_READ_NO_PREFETCH));
-
- zgd = (zgd_t *)kmem_alloc(sizeof (zgd_t), KM_SLEEP);
- zgd->zgd_zilog = zv->zv_zilog;
- zgd->zgd_bp = &lr->lr_blkptr;
-
- /*
- * Lock the range of the block to ensure that when the data is
- * written out and its checksum is being calculated that no other
- * thread can change the block.
- */
- boff = P2ALIGN_TYPED(lr->lr_offset, zv->zv_volblocksize, uint64_t);
- rl = zfs_range_lock(&zv->zv_znode, boff, zv->zv_volblocksize,
- RL_READER);
- zgd->zgd_rl = rl;
-
- VERIFY(0 == dmu_buf_hold(os, ZVOL_OBJ, lr->lr_offset, zgd, &db));
- error = dmu_sync(zio, db, &lr->lr_blkptr,
- lr->lr_common.lrc_txg, zvol_get_done, zgd);
- if (error == 0)
- zil_add_block(zv->zv_zilog, &lr->lr_blkptr);
- /*
- * If we get EINPROGRESS, then we need to wait for a
- * write IO initiated by dmu_sync() to complete before
- * we can release this dbuf. We will finish everything
- * up in the zvol_get_done() callback.
- */
- if (error == EINPROGRESS)
- return (0);
- dmu_buf_rele(db, zgd);
- zfs_range_unlock(rl);
- kmem_free(zgd, sizeof (zgd_t));
- 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;
-
- if (zil_disable)
- return;
-
- if (zilog->zl_replay) {
- dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx);
- zilog->zl_replayed_seq[dmu_tx_get_txg(tx) & TXG_MASK] =
- zilog->zl_replaying_seq;
- return;
- }
-
- slogging = spa_has_slogs(zilog->zl_spa);
-
- 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 > zvol_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) {
- kmem_free(itx, offsetof(itx_t, itx_lr) +
- itx->itx_lr.lrc_reclen);
- 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 = off - P2ALIGN_TYPED(off, blocksize, uint64_t);
- BP_ZERO(&lr->lr_blkptr);
-
- itx->itx_private = zv;
- itx->itx_sync = sync;
-
- (void) zil_itx_assign(zilog, itx, tx);
-
- off += len;
- resid -= len;
- }
-}
-
-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);
- }
- 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);
- spa_config_exit(spa, SCL_STATE, FTAG);
- return (error);
-}
-
-int
-zvol_strategy(buf_t *bp)
-{
- zvol_state_t *zv = ddi_get_soft_state(zvol_state, getminor(bp->b_edev));
- uint64_t off, volsize;
- size_t resid;
- char *addr;
- objset_t *os;
- rl_t *rl;
- int error = 0;
- boolean_t doread = bp->b_flags & B_READ;
- boolean_t is_dump = zv->zv_flags & ZVOL_DUMPIFIED;
- boolean_t sync;
-
- if (zv == NULL) {
- bioerror(bp, ENXIO);
- biodone(bp);
- return (0);
- }
-
- if (getminor(bp->b_edev) == 0) {
- bioerror(bp, EINVAL);
- biodone(bp);
- return (0);
- }
-
- if (!(bp->b_flags & B_READ) &&
- (zv->zv_flags & ZVOL_RDONLY ||
- zv->zv_mode & DS_MODE_READONLY)) {
- bioerror(bp, EROFS);
- biodone(bp);
- return (0);
- }
-
- off = ldbtob(bp->b_blkno);
- volsize = zv->zv_volsize;
-
- os = zv->zv_objset;
- ASSERT(os != NULL);
-
- bp_mapin(bp);
- addr = bp->b_un.b_addr;
- resid = bp->b_bcount;
-
- if (resid > 0 && (off < 0 || off >= volsize)) {
- bioerror(bp, EIO);
- biodone(bp);
- return (0);
- }
-
- sync = !(bp->b_flags & B_ASYNC) && !doread && !is_dump &&
- !(zv->zv_flags & ZVOL_WCE) && !zil_disable;
-
- /*
- * 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 (is_dump) {
- size = MIN(size, P2END(off, zv->zv_volblocksize) - off);
- error = zvol_dumpio(zv, addr, off, size,
- doread, B_FALSE);
- } else 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);
-
- if ((bp->b_resid = resid) == bp->b_bcount)
- bioerror(bp, off > volsize ? EINVAL : error);
-
- if (sync)
- zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ);
- biodone(bp);
-
- return (0);
-}
-
-/*
- * 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;
-
- if (minor == 0) /* This is the control device */
- return (ENXIO);
-
- zv = ddi_get_soft_state(zvol_state, minor);
- 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;
-
- if (minor == 0) /* This is the control device */
- return (ENXIO);
-
- zv = ddi_get_soft_state(zvol_state, minor);
- 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;
-
- if (minor == 0) /* This is the control device */
- return (ENXIO);
-
- zv = ddi_get_soft_state(zvol_state, minor);
- 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) && !zil_disable;
-
- 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(zv->zv_objset, ZVOL_OBJ, 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, UINT64_MAX, 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);
-}
-
-/*
- * 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(&zvol_state_lock);
-
- zv = ddi_get_soft_state(zvol_state, getminor(dev));
-
- if (zv == NULL) {
- mutex_exit(&zvol_state_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_maxtransfer = 1 << (SPA_MAXBLOCKSHIFT - zv->zv_min_bs);
- mutex_exit(&zvol_state_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(&zvol_state_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(&zvol_state_lock);
- error = zvol_getefi((void *)arg, flag, vs, bs);
- return (error);
- }
-
- case DKIOCFLUSHWRITECACHE:
- dkc = (struct dk_callback *)arg;
- mutex_exit(&zvol_state_lock);
- zil_commit(zv->zv_zilog, UINT64_MAX, 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(&zvol_state_lock);
- } else {
- zv->zv_flags &= ~ZVOL_WCE;
- mutex_exit(&zvol_state_lock);
- zil_commit(zv->zv_zilog, UINT64_MAX, 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(&zvol_state_lock);
- return (error);
-}
-
-int
-zvol_busy(void)
-{
- return (zvol_minors != 0);
-}
-
-void
-zvol_init(void)
-{
- VERIFY(ddi_soft_state_init(&zvol_state, sizeof (zvol_state_t), 1) == 0);
- mutex_init(&zvol_state_lock, NULL, MUTEX_DEFAULT, NULL);
-}
-
-void
-zvol_fini(void)
-{
- mutex_destroy(&zvol_state_lock);
- ddi_soft_state_fini(&zvol_state);
-}
-
-static boolean_t
-zvol_is_swap(zvol_state_t *zv)
-{
- vnode_t *vp;
- boolean_t ret = B_FALSE;
- char *devpath;
- size_t devpathlen;
- int error;
-
- devpathlen = strlen(ZVOL_FULL_DEV_DIR) + strlen(zv->zv_name) + 1;
- devpath = kmem_alloc(devpathlen, KM_SLEEP);
- (void) sprintf(devpath, "%s%s", ZVOL_FULL_DEV_DIR, zv->zv_name);
- error = lookupname(devpath, UIO_SYSSPACE, FOLLOW, NULLVPP, &vp);
- kmem_free(devpath, devpathlen);
-
- ret = !error && IS_SWAPVP(common_specvp(vp));
-
- if (vp != NULL)
- VN_RELE(vp);
-
- return (ret);
-}
-
-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;
-
- ASSERT(MUTEX_HELD(&zvol_state_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);
- }
-
- /*
- * 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;
-
- 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);
-
- 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);
- }
- dmu_tx_commit(tx);
-
- /* Truncate the file */
- if (!error)
- error = dmu_free_long_range(zv->zv_objset,
- ZVOL_OBJ, 0, DMU_OBJECT_END);
-
- if (error)
- return (error);
-
- /*
- * 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);
- VERIFY(nvlist_add_uint64(nv,
- zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE),
- SPA_MAXBLOCKSIZE) == 0);
-
- error = zfs_set_prop_nvlist(zv->zv_name, nv);
- 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 || (zv->zv_mode & DS_MODE_READONLY))
- return (EROFS);
-
- /*
- * We do not support swap devices acting as dump devices.
- */
- if (zvol_is_swap(zv))
- return (ENOTSUP);
-
- 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;
-
- /*
- * 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);
- (void) nvlist_add_uint64(nv,
- zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), vbs);
- (void) zfs_set_prop_nvlist(zv->zv_name, nv);
- nvlist_free(nv);
-
- zvol_free_extents(zv);
- zv->zv_flags &= ~ZVOL_DUMPIFIED;
- (void) dmu_free_long_range(os, ZVOL_OBJ, 0, DMU_OBJECT_END);
-
- return (0);
-}
git://git.camperquake.de / zfs.git / commitdiff