diff options
Diffstat (limited to 'module/zfs')
| -rw-r--r-- | module/zfs/zvol.c | 1835 |
1 files changed, 0 insertions, 1835 deletions
diff --git a/module/zfs/zvol.c b/module/zfs/zvol.c deleted file mode 100644 index cfd3b3dbd..000000000 --- a/module/zfs/zvol.c +++ /dev/null @@ -1,1835 +0,0 @@ -/* - * 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); -} |