1756 lines
42 KiB
C
1756 lines
42 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/*
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* ZFS volume emulation driver.
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*
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* Makes a DMU object look like a volume of arbitrary size, up to 2^64 bytes.
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* Volumes are accessed through the symbolic links named:
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*
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* /dev/zvol/dsk/<pool_name>/<dataset_name>
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* /dev/zvol/rdsk/<pool_name>/<dataset_name>
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*
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* These links are created by the ZFS-specific devfsadm link generator.
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* Volumes are persistent through reboot. No user command needs to be
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* run before opening and using a device.
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*/
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/errno.h>
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#include <sys/uio.h>
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#include <sys/buf.h>
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#include <sys/modctl.h>
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#include <sys/open.h>
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#include <sys/kmem.h>
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#include <sys/conf.h>
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#include <sys/cmn_err.h>
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#include <sys/stat.h>
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#include <sys/zap.h>
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#include <sys/spa.h>
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#include <sys/zio.h>
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#include <sys/dmu_traverse.h>
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#include <sys/dnode.h>
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#include <sys/dsl_dataset.h>
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#include <sys/dsl_prop.h>
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#include <sys/dkio.h>
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#include <sys/efi_partition.h>
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#include <sys/byteorder.h>
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#include <sys/pathname.h>
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#include <sys/ddi.h>
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#include <sys/sunddi.h>
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#include <sys/crc32.h>
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#include <sys/dirent.h>
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#include <sys/policy.h>
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#include <sys/fs/zfs.h>
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#include <sys/zfs_ioctl.h>
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#include <sys/mkdev.h>
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#include <sys/zil.h>
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#include <sys/refcount.h>
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#include <sys/zfs_znode.h>
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#include <sys/zfs_rlock.h>
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#include <sys/vdev_disk.h>
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#include <sys/vdev_impl.h>
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#include <sys/zvol.h>
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#include <sys/dumphdr.h>
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#ifdef HAVE_SPL
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#include <linux/bitops.h>
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#include <linux/bitops_compat.h>
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#endif
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#include "zfs_namecheck.h"
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#ifdef HAVE_ZVOL
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static void *zvol_state;
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#define ZVOL_DUMPSIZE "dumpsize"
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/*
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* This lock protects the zvol_state structure from being modified
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* while it's being used, e.g. an open that comes in before a create
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* finishes. It also protects temporary opens of the dataset so that,
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* e.g., an open doesn't get a spurious EBUSY.
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*/
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static kmutex_t zvol_state_lock;
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static uint32_t zvol_minors;
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typedef struct zvol_extent {
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list_node_t ze_node;
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dva_t ze_dva; /* dva associated with this extent */
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uint64_t ze_nblks; /* number of blocks in extent */
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} zvol_extent_t;
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/*
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* The in-core state of each volume.
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*/
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typedef struct zvol_state {
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char zv_name[MAXPATHLEN]; /* pool/dd name */
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uint64_t zv_volsize; /* amount of space we advertise */
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uint64_t zv_volblocksize; /* volume block size */
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minor_t zv_minor; /* minor number */
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uint8_t zv_min_bs; /* minimum addressable block shift */
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uint8_t zv_flags; /* readonly; dumpified */
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objset_t *zv_objset; /* objset handle */
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uint32_t zv_mode; /* DS_MODE_* flags at open time */
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uint32_t zv_open_count[OTYPCNT]; /* open counts */
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uint32_t zv_total_opens; /* total open count */
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zilog_t *zv_zilog; /* ZIL handle */
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list_t zv_extents; /* List of extents for dump */
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uint64_t zv_txg_assign; /* txg to assign during ZIL replay */
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znode_t zv_znode; /* for range locking */
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} zvol_state_t;
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/*
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* zvol specific flags
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*/
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#define ZVOL_RDONLY 0x1
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#define ZVOL_DUMPIFIED 0x2
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#define ZVOL_EXCL 0x4
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/*
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* zvol maximum transfer in one DMU tx.
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*/
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int zvol_maxphys = DMU_MAX_ACCESS/2;
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extern int zfs_set_prop_nvlist(const char *, nvlist_t *);
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static int zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio);
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static int zvol_dumpify(zvol_state_t *zv);
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static int zvol_dump_fini(zvol_state_t *zv);
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static int zvol_dump_init(zvol_state_t *zv, boolean_t resize);
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static void
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zvol_size_changed(zvol_state_t *zv, major_t maj)
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{
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dev_t dev = makedevice(maj, zv->zv_minor);
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VERIFY(ddi_prop_update_int64(dev, zfs_dip,
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"Size", zv->zv_volsize) == DDI_SUCCESS);
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VERIFY(ddi_prop_update_int64(dev, zfs_dip,
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"Nblocks", lbtodb(zv->zv_volsize)) == DDI_SUCCESS);
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/* Notify specfs to invalidate the cached size */
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spec_size_invalidate(dev, VBLK);
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spec_size_invalidate(dev, VCHR);
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}
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#endif /* HAVE_ZVOL */
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int
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zvol_check_volsize(uint64_t volsize, uint64_t blocksize)
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{
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if (volsize == 0)
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return (EINVAL);
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if (volsize % blocksize != 0)
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return (EINVAL);
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#ifdef HAVE_SPL
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if (volsize % 512 != 0)
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return (EINVAL);
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/*
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* On Linux, the maximum allowed block device size depends on the size
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* of sector_t.
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*/
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if (fls64(volsize / 512 - 1) > NBBY * sizeof (sector_t))
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return (EOVERFLOW);
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#elif defined(_ILP32)
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if (volsize - 1 > SPEC_MAXOFFSET_T)
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return (EOVERFLOW);
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#endif
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return (0);
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}
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int
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zvol_check_volblocksize(uint64_t volblocksize)
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{
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if (volblocksize < SPA_MINBLOCKSIZE ||
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volblocksize > SPA_MAXBLOCKSIZE ||
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!ISP2(volblocksize))
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return (EDOM);
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return (0);
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}
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#ifdef HAVE_ZVOL
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static void
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zvol_readonly_changed_cb(void *arg, uint64_t newval)
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{
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zvol_state_t *zv = arg;
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if (newval)
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zv->zv_flags |= ZVOL_RDONLY;
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else
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zv->zv_flags &= ~ZVOL_RDONLY;
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}
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#endif /* HAVE_ZVOL */
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int
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zvol_get_stats(objset_t *os, nvlist_t *nv)
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{
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int error;
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dmu_object_info_t doi;
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uint64_t val;
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error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val);
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if (error)
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return (error);
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dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val);
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error = dmu_object_info(os, ZVOL_OBJ, &doi);
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if (error == 0) {
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dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE,
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doi.doi_data_block_size);
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}
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return (error);
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}
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#ifdef HAVE_ZVOL
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/*
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* Find a free minor number.
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*/
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static minor_t
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zvol_minor_alloc(void)
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{
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minor_t minor;
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ASSERT(MUTEX_HELD(&zvol_state_lock));
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for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++)
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if (ddi_get_soft_state(zvol_state, minor) == NULL)
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return (minor);
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return (0);
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}
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static zvol_state_t *
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zvol_minor_lookup(const char *name)
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{
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minor_t minor;
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zvol_state_t *zv;
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ASSERT(MUTEX_HELD(&zvol_state_lock));
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for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++) {
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zv = ddi_get_soft_state(zvol_state, minor);
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if (zv == NULL)
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continue;
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if (strcmp(zv->zv_name, name) == 0)
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break;
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}
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return (zv);
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}
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/* extent mapping arg */
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struct maparg {
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zvol_state_t *ma_zv;
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uint64_t ma_blks;
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};
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/*ARGSUSED*/
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static int
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zvol_map_block(spa_t *spa, blkptr_t *bp, const zbookmark_t *zb,
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const dnode_phys_t *dnp, void *arg)
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{
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struct maparg *ma = arg;
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zvol_extent_t *ze;
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int bs = ma->ma_zv->zv_volblocksize;
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if (bp == NULL || zb->zb_object != ZVOL_OBJ || zb->zb_level != 0)
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return (0);
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VERIFY3U(ma->ma_blks, ==, zb->zb_blkid);
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ma->ma_blks++;
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/* Abort immediately if we have encountered gang blocks */
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if (BP_IS_GANG(bp))
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return (EFRAGS);
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/*
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* See if the block is at the end of the previous extent.
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*/
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ze = list_tail(&ma->ma_zv->zv_extents);
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if (ze &&
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DVA_GET_VDEV(BP_IDENTITY(bp)) == DVA_GET_VDEV(&ze->ze_dva) &&
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DVA_GET_OFFSET(BP_IDENTITY(bp)) ==
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DVA_GET_OFFSET(&ze->ze_dva) + ze->ze_nblks * bs) {
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ze->ze_nblks++;
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return (0);
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}
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dprintf_bp(bp, "%s", "next blkptr:");
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/* start a new extent */
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ze = kmem_zalloc(sizeof (zvol_extent_t), KM_SLEEP);
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ze->ze_dva = bp->blk_dva[0]; /* structure assignment */
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ze->ze_nblks = 1;
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list_insert_tail(&ma->ma_zv->zv_extents, ze);
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return (0);
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}
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static void
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zvol_free_extents(zvol_state_t *zv)
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{
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zvol_extent_t *ze;
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while (ze = list_head(&zv->zv_extents)) {
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list_remove(&zv->zv_extents, ze);
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kmem_free(ze, sizeof (zvol_extent_t));
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}
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}
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static int
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zvol_get_lbas(zvol_state_t *zv)
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{
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struct maparg ma;
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int err;
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ma.ma_zv = zv;
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ma.ma_blks = 0;
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zvol_free_extents(zv);
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err = traverse_dataset(dmu_objset_ds(zv->zv_objset), 0,
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TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, zvol_map_block, &ma);
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if (err || ma.ma_blks != (zv->zv_volsize / zv->zv_volblocksize)) {
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zvol_free_extents(zv);
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return (err ? err : EIO);
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}
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return (0);
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}
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/* ARGSUSED */
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void
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zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx)
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{
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zfs_creat_t *zct = arg;
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nvlist_t *nvprops = zct->zct_props;
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int error;
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uint64_t volblocksize, volsize;
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VERIFY(nvlist_lookup_uint64(nvprops,
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zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0);
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if (nvlist_lookup_uint64(nvprops,
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zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0)
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volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE);
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/*
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* These properties must be removed from the list so the generic
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* property setting step won't apply to them.
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*/
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VERIFY(nvlist_remove_all(nvprops,
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zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0);
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(void) nvlist_remove_all(nvprops,
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zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE));
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error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize,
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DMU_OT_NONE, 0, tx);
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ASSERT(error == 0);
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error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP,
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DMU_OT_NONE, 0, tx);
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ASSERT(error == 0);
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error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx);
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ASSERT(error == 0);
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}
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/*
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* Replay a TX_WRITE ZIL transaction that didn't get committed
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* after a system failure
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*/
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static int
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zvol_replay_write(zvol_state_t *zv, lr_write_t *lr, boolean_t byteswap)
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{
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objset_t *os = zv->zv_objset;
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char *data = (char *)(lr + 1); /* data follows lr_write_t */
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uint64_t off = lr->lr_offset;
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uint64_t len = lr->lr_length;
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dmu_tx_t *tx;
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int error;
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if (byteswap)
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byteswap_uint64_array(lr, sizeof (*lr));
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tx = dmu_tx_create(os);
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dmu_tx_hold_write(tx, ZVOL_OBJ, off, len);
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error = dmu_tx_assign(tx, zv->zv_txg_assign);
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if (error) {
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dmu_tx_abort(tx);
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} else {
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dmu_write(os, ZVOL_OBJ, off, len, data, tx);
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dmu_tx_commit(tx);
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}
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return (error);
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}
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/* ARGSUSED */
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static int
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zvol_replay_err(zvol_state_t *zv, lr_t *lr, boolean_t byteswap)
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{
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return (ENOTSUP);
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}
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|
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/*
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* Callback vectors for replaying records.
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* Only TX_WRITE is needed for zvol.
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*/
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zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = {
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zvol_replay_err, /* 0 no such transaction type */
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zvol_replay_err, /* TX_CREATE */
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zvol_replay_err, /* TX_MKDIR */
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zvol_replay_err, /* TX_MKXATTR */
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zvol_replay_err, /* TX_SYMLINK */
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zvol_replay_err, /* TX_REMOVE */
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zvol_replay_err, /* TX_RMDIR */
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zvol_replay_err, /* TX_LINK */
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zvol_replay_err, /* TX_RENAME */
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zvol_replay_write, /* TX_WRITE */
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zvol_replay_err, /* TX_TRUNCATE */
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zvol_replay_err, /* TX_SETATTR */
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zvol_replay_err, /* TX_ACL */
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};
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|
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/*
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* Create a minor node (plus a whole lot more) for the specified volume.
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*/
|
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int
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zvol_create_minor(const char *name, major_t maj)
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{
|
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zvol_state_t *zv;
|
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objset_t *os;
|
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dmu_object_info_t doi;
|
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uint64_t volsize;
|
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minor_t minor = 0;
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struct pathname linkpath;
|
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int ds_mode = DS_MODE_OWNER;
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vnode_t *vp = NULL;
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char *devpath;
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size_t devpathlen = strlen(ZVOL_FULL_DEV_DIR) + strlen(name) + 1;
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char chrbuf[30], blkbuf[30];
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int error;
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mutex_enter(&zvol_state_lock);
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if ((zv = zvol_minor_lookup(name)) != NULL) {
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mutex_exit(&zvol_state_lock);
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return (EEXIST);
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}
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if (strchr(name, '@') != 0)
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ds_mode |= DS_MODE_READONLY;
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error = dmu_objset_open(name, DMU_OST_ZVOL, ds_mode, &os);
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if (error) {
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mutex_exit(&zvol_state_lock);
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return (error);
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}
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error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize);
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|
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if (error) {
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dmu_objset_close(os);
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mutex_exit(&zvol_state_lock);
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return (error);
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}
|
|
|
|
/*
|
|
* 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);
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|
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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, &zv->zv_txg_assign, zvol_replay_vector, NULL);
|
|
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);
|
|
}
|
|
}
|
|
|
|
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));
|
|
|
|
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 len)
|
|
{
|
|
uint32_t blocksize = zv->zv_volblocksize;
|
|
lr_write_t *lr;
|
|
|
|
while (len) {
|
|
ssize_t nbytes = MIN(len, blocksize - P2PHASE(off, blocksize));
|
|
itx_t *itx = zil_itx_create(TX_WRITE, sizeof (*lr));
|
|
|
|
itx->itx_wr_state =
|
|
len > zvol_immediate_write_sz ? WR_INDIRECT : WR_NEED_COPY;
|
|
itx->itx_private = zv;
|
|
lr = (lr_write_t *)&itx->itx_lr;
|
|
lr->lr_foid = ZVOL_OBJ;
|
|
lr->lr_offset = off;
|
|
lr->lr_length = nbytes;
|
|
lr->lr_blkoff = off - P2ALIGN_TYPED(off, blocksize, uint64_t);
|
|
BP_ZERO(&lr->lr_blkptr);
|
|
|
|
(void) zil_itx_assign(zv->zv_zilog, itx, tx);
|
|
len -= nbytes;
|
|
off += nbytes;
|
|
}
|
|
}
|
|
|
|
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);
|
|
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;
|
|
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
} 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);
|
|
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 (!(bp->b_flags & B_ASYNC) && !doread && !zil_disable && !is_dump)
|
|
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;
|
|
|
|
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);
|
|
}
|
|
|
|
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);
|
|
dmu_tx_commit(tx);
|
|
|
|
if (error)
|
|
break;
|
|
}
|
|
zfs_range_unlock(rl);
|
|
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);
|
|
}
|
|
|
|
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;
|
|
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;
|
|
}
|
|
break;
|
|
|
|
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:
|
|
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);
|
|
}
|
|
#endif /* HAVE_ZVOL */
|
|
|
|
int
|
|
zvol_busy(void)
|
|
{
|
|
#ifdef HAVE_ZVOL
|
|
return (zvol_minors != 0);
|
|
#else
|
|
return 0;
|
|
#endif /* HAVE_ZVOL */
|
|
}
|
|
|
|
void
|
|
zvol_init(void)
|
|
{
|
|
#ifdef HAVE_ZVOL
|
|
VERIFY(ddi_soft_state_init(&zvol_state, sizeof (zvol_state_t), 1) == 0);
|
|
mutex_init(&zvol_state_lock, NULL, MUTEX_DEFAULT, NULL);
|
|
#endif /* HAVE_ZVOL */
|
|
}
|
|
|
|
void
|
|
zvol_fini(void)
|
|
{
|
|
#ifdef HAVE_ZVOL
|
|
mutex_destroy(&zvol_state_lock);
|
|
ddi_soft_state_fini(&zvol_state);
|
|
#endif /* HAVE_ZVOL */
|
|
}
|
|
|
|
#ifdef HAVE_ZVOL
|
|
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);
|
|
}
|
|
#endif /* HAVE_ZVOL */
|