diff options
Diffstat (limited to 'sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_disk.c')
| -rw-r--r-- | sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_disk.c | 971 |
1 files changed, 971 insertions, 0 deletions
diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_disk.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_disk.c new file mode 100644 index 000000000000..2fe7b35f4fa0 --- /dev/null +++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_disk.c @@ -0,0 +1,971 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License (the "License"). + * You may not use this file except in compliance with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ +/* + * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. + * Copyright (c) 2012, 2018 by Delphix. All rights reserved. + * Copyright 2016 Nexenta Systems, Inc. All rights reserved. + * Copyright (c) 2013 Joyent, Inc. All rights reserved. + */ + +#include <sys/zfs_context.h> +#include <sys/spa_impl.h> +#include <sys/refcount.h> +#include <sys/vdev_disk.h> +#include <sys/vdev_impl.h> +#include <sys/abd.h> +#include <sys/fs/zfs.h> +#include <sys/zio.h> +#include <sys/sunldi.h> +#include <sys/efi_partition.h> +#include <sys/fm/fs/zfs.h> + +/* + * Virtual device vector for disks. + */ + +extern ldi_ident_t zfs_li; + +static void vdev_disk_close(vdev_t *); + +typedef struct vdev_disk_ldi_cb { + list_node_t lcb_next; + ldi_callback_id_t lcb_id; +} vdev_disk_ldi_cb_t; + +/* + * Bypass the devid when opening a disk vdev. + * There have been issues where the devids of several devices were shuffled, + * causing pool open failures. Note, that this flag is intended to be used + * for pool recovery only. + * + * Note that if a pool is imported with the devids bypassed, all its vdevs will + * cease storing devid information permanently. In practice, the devid is rarely + * useful as vdev paths do not tend to change unless the hardware is + * reconfigured. That said, if the paths do change and a pool fails to open + * automatically at boot, a simple zpool import should re-scan the paths and fix + * the issue. + */ +boolean_t vdev_disk_bypass_devid = B_FALSE; + +static void +vdev_disk_alloc(vdev_t *vd) +{ + vdev_disk_t *dvd; + + dvd = vd->vdev_tsd = kmem_zalloc(sizeof (vdev_disk_t), KM_SLEEP); + /* + * Create the LDI event callback list. + */ + list_create(&dvd->vd_ldi_cbs, sizeof (vdev_disk_ldi_cb_t), + offsetof(vdev_disk_ldi_cb_t, lcb_next)); +} + +static void +vdev_disk_free(vdev_t *vd) +{ + vdev_disk_t *dvd = vd->vdev_tsd; + vdev_disk_ldi_cb_t *lcb; + + if (dvd == NULL) + return; + + /* + * We have already closed the LDI handle. Clean up the LDI event + * callbacks and free vd->vdev_tsd. + */ + while ((lcb = list_head(&dvd->vd_ldi_cbs)) != NULL) { + list_remove(&dvd->vd_ldi_cbs, lcb); + (void) ldi_ev_remove_callbacks(lcb->lcb_id); + kmem_free(lcb, sizeof (vdev_disk_ldi_cb_t)); + } + list_destroy(&dvd->vd_ldi_cbs); + kmem_free(dvd, sizeof (vdev_disk_t)); + vd->vdev_tsd = NULL; +} + +/* ARGSUSED */ +static int +vdev_disk_off_notify(ldi_handle_t lh, ldi_ev_cookie_t ecookie, void *arg, + void *ev_data) +{ + vdev_t *vd = (vdev_t *)arg; + vdev_disk_t *dvd = vd->vdev_tsd; + + /* + * Ignore events other than offline. + */ + if (strcmp(ldi_ev_get_type(ecookie), LDI_EV_OFFLINE) != 0) + return (LDI_EV_SUCCESS); + + /* + * All LDI handles must be closed for the state change to succeed, so + * call on vdev_disk_close() to do this. + * + * We inform vdev_disk_close that it is being called from offline + * notify context so it will defer cleanup of LDI event callbacks and + * freeing of vd->vdev_tsd to the offline finalize or a reopen. + */ + dvd->vd_ldi_offline = B_TRUE; + vdev_disk_close(vd); + + /* + * Now that the device is closed, request that the spa_async_thread + * mark the device as REMOVED and notify FMA of the removal. + */ + zfs_post_remove(vd->vdev_spa, vd); + vd->vdev_remove_wanted = B_TRUE; + spa_async_request(vd->vdev_spa, SPA_ASYNC_REMOVE); + + return (LDI_EV_SUCCESS); +} + +/* ARGSUSED */ +static void +vdev_disk_off_finalize(ldi_handle_t lh, ldi_ev_cookie_t ecookie, + int ldi_result, void *arg, void *ev_data) +{ + vdev_t *vd = (vdev_t *)arg; + + /* + * Ignore events other than offline. + */ + if (strcmp(ldi_ev_get_type(ecookie), LDI_EV_OFFLINE) != 0) + return; + + /* + * We have already closed the LDI handle in notify. + * Clean up the LDI event callbacks and free vd->vdev_tsd. + */ + vdev_disk_free(vd); + + /* + * Request that the vdev be reopened if the offline state change was + * unsuccessful. + */ + if (ldi_result != LDI_EV_SUCCESS) { + vd->vdev_probe_wanted = B_TRUE; + spa_async_request(vd->vdev_spa, SPA_ASYNC_PROBE); + } +} + +static ldi_ev_callback_t vdev_disk_off_callb = { + .cb_vers = LDI_EV_CB_VERS, + .cb_notify = vdev_disk_off_notify, + .cb_finalize = vdev_disk_off_finalize +}; + +/* ARGSUSED */ +static void +vdev_disk_dgrd_finalize(ldi_handle_t lh, ldi_ev_cookie_t ecookie, + int ldi_result, void *arg, void *ev_data) +{ + vdev_t *vd = (vdev_t *)arg; + + /* + * Ignore events other than degrade. + */ + if (strcmp(ldi_ev_get_type(ecookie), LDI_EV_DEGRADE) != 0) + return; + + /* + * Degrade events always succeed. Mark the vdev as degraded. + * This status is purely informative for the user. + */ + (void) vdev_degrade(vd->vdev_spa, vd->vdev_guid, 0); +} + +static ldi_ev_callback_t vdev_disk_dgrd_callb = { + .cb_vers = LDI_EV_CB_VERS, + .cb_notify = NULL, + .cb_finalize = vdev_disk_dgrd_finalize +}; + +static void +vdev_disk_hold(vdev_t *vd) +{ + ddi_devid_t devid; + char *minor; + + ASSERT(spa_config_held(vd->vdev_spa, SCL_STATE, RW_WRITER)); + + /* + * We must have a pathname, and it must be absolute. + */ + if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') + return; + + /* + * Only prefetch path and devid info if the device has + * never been opened. + */ + if (vd->vdev_tsd != NULL) + return; + + if (vd->vdev_wholedisk == -1ULL) { + size_t len = strlen(vd->vdev_path) + 3; + char *buf = kmem_alloc(len, KM_SLEEP); + + (void) snprintf(buf, len, "%ss0", vd->vdev_path); + + (void) ldi_vp_from_name(buf, &vd->vdev_name_vp); + kmem_free(buf, len); + } + + if (vd->vdev_name_vp == NULL) + (void) ldi_vp_from_name(vd->vdev_path, &vd->vdev_name_vp); + + if (vd->vdev_devid != NULL && + ddi_devid_str_decode(vd->vdev_devid, &devid, &minor) == 0) { + (void) ldi_vp_from_devid(devid, minor, &vd->vdev_devid_vp); + ddi_devid_str_free(minor); + ddi_devid_free(devid); + } +} + +static void +vdev_disk_rele(vdev_t *vd) +{ + ASSERT(spa_config_held(vd->vdev_spa, SCL_STATE, RW_WRITER)); + + if (vd->vdev_name_vp) { + VN_RELE_ASYNC(vd->vdev_name_vp, + dsl_pool_vnrele_taskq(vd->vdev_spa->spa_dsl_pool)); + vd->vdev_name_vp = NULL; + } + if (vd->vdev_devid_vp) { + VN_RELE_ASYNC(vd->vdev_devid_vp, + dsl_pool_vnrele_taskq(vd->vdev_spa->spa_dsl_pool)); + vd->vdev_devid_vp = NULL; + } +} + +/* + * We want to be loud in DEBUG kernels when DKIOCGMEDIAINFOEXT fails, or when + * even a fallback to DKIOCGMEDIAINFO fails. + */ +#ifdef DEBUG +#define VDEV_DEBUG(...) cmn_err(CE_NOTE, __VA_ARGS__) +#else +#define VDEV_DEBUG(...) /* Nothing... */ +#endif + +static int +vdev_disk_open(vdev_t *vd, uint64_t *psize, uint64_t *max_psize, + uint64_t *ashift) +{ + spa_t *spa = vd->vdev_spa; + vdev_disk_t *dvd = vd->vdev_tsd; + ldi_ev_cookie_t ecookie; + vdev_disk_ldi_cb_t *lcb; + union { + struct dk_minfo_ext ude; + struct dk_minfo ud; + } dks; + struct dk_minfo_ext *dkmext = &dks.ude; + struct dk_minfo *dkm = &dks.ud; + int error; + dev_t dev; + int otyp; + boolean_t validate_devid = B_FALSE; + ddi_devid_t devid; + uint64_t capacity = 0, blksz = 0, pbsize; + + /* + * We must have a pathname, and it must be absolute. + */ + if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') { + vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL; + return (SET_ERROR(EINVAL)); + } + + /* + * Reopen the device if it's not currently open. Otherwise, + * just update the physical size of the device. + */ + if (dvd != NULL) { + if (dvd->vd_ldi_offline && dvd->vd_lh == NULL) { + /* + * If we are opening a device in its offline notify + * context, the LDI handle was just closed. Clean + * up the LDI event callbacks and free vd->vdev_tsd. + */ + vdev_disk_free(vd); + } else { + ASSERT(vd->vdev_reopening); + goto skip_open; + } + } + + /* + * Create vd->vdev_tsd. + */ + vdev_disk_alloc(vd); + dvd = vd->vdev_tsd; + + /* + * Allow bypassing the devid. + */ + if (vd->vdev_devid != NULL && vdev_disk_bypass_devid) { + vdev_dbgmsg(vd, "vdev_disk_open, devid %s bypassed", + vd->vdev_devid); + spa_strfree(vd->vdev_devid); + vd->vdev_devid = NULL; + } + + /* + * When opening a disk device, we want to preserve the user's original + * intent. We always want to open the device by the path the user gave + * us, even if it is one of multiple paths to the save device. But we + * also want to be able to survive disks being removed/recabled. + * Therefore the sequence of opening devices is: + * + * 1. Try opening the device by path. For legacy pools without the + * 'whole_disk' property, attempt to fix the path by appending 's0'. + * + * 2. If the devid of the device matches the stored value, return + * success. + * + * 3. Otherwise, the device may have moved. Try opening the device + * by the devid instead. + */ + if (vd->vdev_devid != NULL) { + if (ddi_devid_str_decode(vd->vdev_devid, &dvd->vd_devid, + &dvd->vd_minor) != 0) { + vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL; + vdev_dbgmsg(vd, "vdev_disk_open: invalid " + "vdev_devid '%s'", vd->vdev_devid); + return (SET_ERROR(EINVAL)); + } + } + + error = EINVAL; /* presume failure */ + + if (vd->vdev_path != NULL) { + + if (vd->vdev_wholedisk == -1ULL) { + size_t len = strlen(vd->vdev_path) + 3; + char *buf = kmem_alloc(len, KM_SLEEP); + + (void) snprintf(buf, len, "%ss0", vd->vdev_path); + + error = ldi_open_by_name(buf, spa_mode(spa), kcred, + &dvd->vd_lh, zfs_li); + if (error == 0) { + spa_strfree(vd->vdev_path); + vd->vdev_path = buf; + vd->vdev_wholedisk = 1ULL; + } else { + kmem_free(buf, len); + } + } + + /* + * If we have not yet opened the device, try to open it by the + * specified path. + */ + if (error != 0) { + error = ldi_open_by_name(vd->vdev_path, spa_mode(spa), + kcred, &dvd->vd_lh, zfs_li); + } + + /* + * Compare the devid to the stored value. + */ + if (error == 0 && vd->vdev_devid != NULL && + ldi_get_devid(dvd->vd_lh, &devid) == 0) { + if (ddi_devid_compare(devid, dvd->vd_devid) != 0) { + /* + * A mismatch here is unexpected, log it. + */ + char *devid_str = ddi_devid_str_encode(devid, + dvd->vd_minor); + vdev_dbgmsg(vd, "vdev_disk_open: devid " + "mismatch: %s != %s", vd->vdev_devid, + devid_str); + cmn_err(CE_NOTE, "vdev_disk_open %s: devid " + "mismatch: %s != %s", vd->vdev_path, + vd->vdev_devid, devid_str); + ddi_devid_str_free(devid_str); + + error = SET_ERROR(EINVAL); + (void) ldi_close(dvd->vd_lh, spa_mode(spa), + kcred); + dvd->vd_lh = NULL; + } + ddi_devid_free(devid); + } + + /* + * If we succeeded in opening the device, but 'vdev_wholedisk' + * is not yet set, then this must be a slice. + */ + if (error == 0 && vd->vdev_wholedisk == -1ULL) + vd->vdev_wholedisk = 0; + } + + /* + * If we were unable to open by path, or the devid check fails, open by + * devid instead. + */ + if (error != 0 && vd->vdev_devid != NULL) { + error = ldi_open_by_devid(dvd->vd_devid, dvd->vd_minor, + spa_mode(spa), kcred, &dvd->vd_lh, zfs_li); + if (error != 0) { + vdev_dbgmsg(vd, "Failed to open by devid (%s)", + vd->vdev_devid); + } + } + + /* + * If all else fails, then try opening by physical path (if available) + * or the logical path (if we failed due to the devid check). While not + * as reliable as the devid, this will give us something, and the higher + * level vdev validation will prevent us from opening the wrong device. + */ + if (error) { + if (vd->vdev_devid != NULL) + validate_devid = B_TRUE; + + if (vd->vdev_physpath != NULL && + (dev = ddi_pathname_to_dev_t(vd->vdev_physpath)) != NODEV) + error = ldi_open_by_dev(&dev, OTYP_BLK, spa_mode(spa), + kcred, &dvd->vd_lh, zfs_li); + + /* + * Note that we don't support the legacy auto-wholedisk support + * as above. This hasn't been used in a very long time and we + * don't need to propagate its oddities to this edge condition. + */ + if (error && vd->vdev_path != NULL) + error = ldi_open_by_name(vd->vdev_path, spa_mode(spa), + kcred, &dvd->vd_lh, zfs_li); + } + + if (error) { + vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; + vdev_dbgmsg(vd, "vdev_disk_open: failed to open [error=%d]", + error); + return (error); + } + + /* + * Now that the device has been successfully opened, update the devid + * if necessary. + */ + if (validate_devid && spa_writeable(spa) && + ldi_get_devid(dvd->vd_lh, &devid) == 0) { + if (ddi_devid_compare(devid, dvd->vd_devid) != 0) { + char *vd_devid; + + vd_devid = ddi_devid_str_encode(devid, dvd->vd_minor); + vdev_dbgmsg(vd, "vdev_disk_open: update devid from " + "'%s' to '%s'", vd->vdev_devid, vd_devid); + cmn_err(CE_NOTE, "vdev_disk_open %s: update devid " + "from '%s' to '%s'", vd->vdev_path != NULL ? + vd->vdev_path : "?", vd->vdev_devid, vd_devid); + spa_strfree(vd->vdev_devid); + vd->vdev_devid = spa_strdup(vd_devid); + ddi_devid_str_free(vd_devid); + } + ddi_devid_free(devid); + } + + /* + * Once a device is opened, verify that the physical device path (if + * available) is up to date. + */ + if (ldi_get_dev(dvd->vd_lh, &dev) == 0 && + ldi_get_otyp(dvd->vd_lh, &otyp) == 0) { + char *physpath, *minorname; + + physpath = kmem_alloc(MAXPATHLEN, KM_SLEEP); + minorname = NULL; + if (ddi_dev_pathname(dev, otyp, physpath) == 0 && + ldi_get_minor_name(dvd->vd_lh, &minorname) == 0 && + (vd->vdev_physpath == NULL || + strcmp(vd->vdev_physpath, physpath) != 0)) { + if (vd->vdev_physpath) + spa_strfree(vd->vdev_physpath); + (void) strlcat(physpath, ":", MAXPATHLEN); + (void) strlcat(physpath, minorname, MAXPATHLEN); + vd->vdev_physpath = spa_strdup(physpath); + } + if (minorname) + kmem_free(minorname, strlen(minorname) + 1); + kmem_free(physpath, MAXPATHLEN); + } + + /* + * Register callbacks for the LDI offline event. + */ + if (ldi_ev_get_cookie(dvd->vd_lh, LDI_EV_OFFLINE, &ecookie) == + LDI_EV_SUCCESS) { + lcb = kmem_zalloc(sizeof (vdev_disk_ldi_cb_t), KM_SLEEP); + list_insert_tail(&dvd->vd_ldi_cbs, lcb); + (void) ldi_ev_register_callbacks(dvd->vd_lh, ecookie, + &vdev_disk_off_callb, (void *) vd, &lcb->lcb_id); + } + + /* + * Register callbacks for the LDI degrade event. + */ + if (ldi_ev_get_cookie(dvd->vd_lh, LDI_EV_DEGRADE, &ecookie) == + LDI_EV_SUCCESS) { + lcb = kmem_zalloc(sizeof (vdev_disk_ldi_cb_t), KM_SLEEP); + list_insert_tail(&dvd->vd_ldi_cbs, lcb); + (void) ldi_ev_register_callbacks(dvd->vd_lh, ecookie, + &vdev_disk_dgrd_callb, (void *) vd, &lcb->lcb_id); + } +skip_open: + /* + * Determine the actual size of the device. + */ + if (ldi_get_size(dvd->vd_lh, psize) != 0) { + vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; + vdev_dbgmsg(vd, "vdev_disk_open: failed to get size"); + return (SET_ERROR(EINVAL)); + } + + *max_psize = *psize; + + /* + * Determine the device's minimum transfer size. + * If the ioctl isn't supported, assume DEV_BSIZE. + */ + if ((error = ldi_ioctl(dvd->vd_lh, DKIOCGMEDIAINFOEXT, + (intptr_t)dkmext, FKIOCTL, kcred, NULL)) == 0) { + capacity = dkmext->dki_capacity - 1; + blksz = dkmext->dki_lbsize; + pbsize = dkmext->dki_pbsize; + } else if ((error = ldi_ioctl(dvd->vd_lh, DKIOCGMEDIAINFO, + (intptr_t)dkm, FKIOCTL, kcred, NULL)) == 0) { + VDEV_DEBUG( + "vdev_disk_open(\"%s\"): fallback to DKIOCGMEDIAINFO\n", + vd->vdev_path); + capacity = dkm->dki_capacity - 1; + blksz = dkm->dki_lbsize; + pbsize = blksz; + } else { + VDEV_DEBUG("vdev_disk_open(\"%s\"): " + "both DKIOCGMEDIAINFO{,EXT} calls failed, %d\n", + vd->vdev_path, error); + pbsize = DEV_BSIZE; + } + + *ashift = highbit64(MAX(pbsize, SPA_MINBLOCKSIZE)) - 1; + + if (vd->vdev_wholedisk == 1) { + int wce = 1; + + if (error == 0) { + /* + * If we have the capability to expand, we'd have + * found out via success from DKIOCGMEDIAINFO{,EXT}. + * Adjust max_psize upward accordingly since we know + * we own the whole disk now. + */ + *max_psize = capacity * blksz; + } + + /* + * Since we own the whole disk, try to enable disk write + * caching. We ignore errors because it's OK if we can't do it. + */ + (void) ldi_ioctl(dvd->vd_lh, DKIOCSETWCE, (intptr_t)&wce, + FKIOCTL, kcred, NULL); + } + + /* + * Clear the nowritecache bit, so that on a vdev_reopen() we will + * try again. + */ + vd->vdev_nowritecache = B_FALSE; + + return (0); +} + +static void +vdev_disk_close(vdev_t *vd) +{ + vdev_disk_t *dvd = vd->vdev_tsd; + + if (vd->vdev_reopening || dvd == NULL) + return; + + if (dvd->vd_minor != NULL) { + ddi_devid_str_free(dvd->vd_minor); + dvd->vd_minor = NULL; + } + + if (dvd->vd_devid != NULL) { + ddi_devid_free(dvd->vd_devid); + dvd->vd_devid = NULL; + } + + if (dvd->vd_lh != NULL) { + (void) ldi_close(dvd->vd_lh, spa_mode(vd->vdev_spa), kcred); + dvd->vd_lh = NULL; + } + + vd->vdev_delayed_close = B_FALSE; + /* + * If we closed the LDI handle due to an offline notify from LDI, + * don't free vd->vdev_tsd or unregister the callbacks here; + * the offline finalize callback or a reopen will take care of it. + */ + if (dvd->vd_ldi_offline) + return; + + vdev_disk_free(vd); +} + +int +vdev_disk_physio(vdev_t *vd, caddr_t data, + size_t size, uint64_t offset, int flags, boolean_t isdump) +{ + vdev_disk_t *dvd = vd->vdev_tsd; + + /* + * If the vdev is closed, it's likely in the REMOVED or FAULTED state. + * Nothing to be done here but return failure. + */ + if (dvd == NULL || (dvd->vd_ldi_offline && dvd->vd_lh == NULL)) + return (EIO); + + ASSERT(vd->vdev_ops == &vdev_disk_ops); + + /* + * If in the context of an active crash dump, use the ldi_dump(9F) + * call instead of ldi_strategy(9F) as usual. + */ + if (isdump) { + ASSERT3P(dvd, !=, NULL); + return (ldi_dump(dvd->vd_lh, data, lbtodb(offset), + lbtodb(size))); + } + + return (vdev_disk_ldi_physio(dvd->vd_lh, data, size, offset, flags)); +} + +int +vdev_disk_ldi_physio(ldi_handle_t vd_lh, caddr_t data, + size_t size, uint64_t offset, int flags) +{ + buf_t *bp; + int error = 0; + + if (vd_lh == NULL) + return (SET_ERROR(EINVAL)); + + ASSERT(flags & B_READ || flags & B_WRITE); + + bp = getrbuf(KM_SLEEP); + bp->b_flags = flags | B_BUSY | B_NOCACHE | B_FAILFAST; + bp->b_bcount = size; + bp->b_un.b_addr = (void *)data; + bp->b_lblkno = lbtodb(offset); + bp->b_bufsize = size; + + error = ldi_strategy(vd_lh, bp); + ASSERT(error == 0); + if ((error = biowait(bp)) == 0 && bp->b_resid != 0) + error = SET_ERROR(EIO); + freerbuf(bp); + + return (error); +} + +static void +vdev_disk_io_intr(buf_t *bp) +{ + vdev_buf_t *vb = (vdev_buf_t *)bp; + zio_t *zio = vb->vb_io; + + /* + * The rest of the zio stack only deals with EIO, ECKSUM, and ENXIO. + * Rather than teach the rest of the stack about other error + * possibilities (EFAULT, etc), we normalize the error value here. + */ + zio->io_error = (geterror(bp) != 0 ? SET_ERROR(EIO) : 0); + + if (zio->io_error == 0 && bp->b_resid != 0) + zio->io_error = SET_ERROR(EIO); + + if (zio->io_type == ZIO_TYPE_READ) { + abd_return_buf_copy(zio->io_abd, bp->b_un.b_addr, zio->io_size); + } else { + abd_return_buf(zio->io_abd, bp->b_un.b_addr, zio->io_size); + } + + kmem_free(vb, sizeof (vdev_buf_t)); + + zio_delay_interrupt(zio); +} + +static void +vdev_disk_ioctl_free(zio_t *zio) +{ + kmem_free(zio->io_vsd, sizeof (struct dk_callback)); +} + +static const zio_vsd_ops_t vdev_disk_vsd_ops = { + vdev_disk_ioctl_free, + zio_vsd_default_cksum_report +}; + +static void +vdev_disk_ioctl_done(void *zio_arg, int error) +{ + zio_t *zio = zio_arg; + + zio->io_error = error; + + zio_interrupt(zio); +} + +static void +vdev_disk_io_start(zio_t *zio) +{ + vdev_t *vd = zio->io_vd; + vdev_disk_t *dvd = vd->vdev_tsd; + vdev_buf_t *vb; + struct dk_callback *dkc; + buf_t *bp; + int error; + + /* + * If the vdev is closed, it's likely in the REMOVED or FAULTED state. + * Nothing to be done here but return failure. + */ + if (dvd == NULL || (dvd->vd_ldi_offline && dvd->vd_lh == NULL)) { + zio->io_error = SET_ERROR(ENXIO); + zio_interrupt(zio); + return; + } + + if (zio->io_type == ZIO_TYPE_IOCTL) { + /* XXPOLICY */ + if (!vdev_readable(vd)) { + zio->io_error = SET_ERROR(ENXIO); + zio_interrupt(zio); + return; + } + + switch (zio->io_cmd) { + + case DKIOCFLUSHWRITECACHE: + + if (zfs_nocacheflush) + break; + + if (vd->vdev_nowritecache) { + zio->io_error = SET_ERROR(ENOTSUP); + break; + } + + zio->io_vsd = dkc = kmem_alloc(sizeof (*dkc), KM_SLEEP); + zio->io_vsd_ops = &vdev_disk_vsd_ops; + + dkc->dkc_callback = vdev_disk_ioctl_done; + dkc->dkc_flag = FLUSH_VOLATILE; + dkc->dkc_cookie = zio; + + error = ldi_ioctl(dvd->vd_lh, zio->io_cmd, + (uintptr_t)dkc, FKIOCTL, kcred, NULL); + + if (error == 0) { + /* + * The ioctl will be done asychronously, + * and will call vdev_disk_ioctl_done() + * upon completion. + */ + return; + } + + zio->io_error = error; + + break; + + default: + zio->io_error = SET_ERROR(ENOTSUP); + } + + zio_execute(zio); + return; + } + + ASSERT(zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE); + zio->io_target_timestamp = zio_handle_io_delay(zio); + + vb = kmem_alloc(sizeof (vdev_buf_t), KM_SLEEP); + + vb->vb_io = zio; + bp = &vb->vb_buf; + + bioinit(bp); + bp->b_flags = B_BUSY | B_NOCACHE | + (zio->io_type == ZIO_TYPE_READ ? B_READ : B_WRITE); + if (!(zio->io_flags & (ZIO_FLAG_IO_RETRY | ZIO_FLAG_TRYHARD))) + bp->b_flags |= B_FAILFAST; + bp->b_bcount = zio->io_size; + + if (zio->io_type == ZIO_TYPE_READ) { + bp->b_un.b_addr = + abd_borrow_buf(zio->io_abd, zio->io_size); + } else { + bp->b_un.b_addr = + abd_borrow_buf_copy(zio->io_abd, zio->io_size); + } + + bp->b_lblkno = lbtodb(zio->io_offset); + bp->b_bufsize = zio->io_size; + bp->b_iodone = (int (*)())vdev_disk_io_intr; + + /* ldi_strategy() will return non-zero only on programming errors */ + VERIFY(ldi_strategy(dvd->vd_lh, bp) == 0); +} + +static void +vdev_disk_io_done(zio_t *zio) +{ + vdev_t *vd = zio->io_vd; + + /* + * If the device returned EIO, then attempt a DKIOCSTATE ioctl to see if + * the device has been removed. If this is the case, then we trigger an + * asynchronous removal of the device. Otherwise, probe the device and + * make sure it's still accessible. + */ + if (zio->io_error == EIO && !vd->vdev_remove_wanted) { + vdev_disk_t *dvd = vd->vdev_tsd; + int state = DKIO_NONE; + + if (ldi_ioctl(dvd->vd_lh, DKIOCSTATE, (intptr_t)&state, + FKIOCTL, kcred, NULL) == 0 && state != DKIO_INSERTED) { + /* + * We post the resource as soon as possible, instead of + * when the async removal actually happens, because the + * DE is using this information to discard previous I/O + * errors. + */ + zfs_post_remove(zio->io_spa, vd); + vd->vdev_remove_wanted = B_TRUE; + spa_async_request(zio->io_spa, SPA_ASYNC_REMOVE); + } else if (!vd->vdev_delayed_close) { + vd->vdev_delayed_close = B_TRUE; + } + } +} + +vdev_ops_t vdev_disk_ops = { + vdev_disk_open, + vdev_disk_close, + vdev_default_asize, + vdev_disk_io_start, + vdev_disk_io_done, + NULL, + NULL, + vdev_disk_hold, + vdev_disk_rele, + NULL, + vdev_default_xlate, + VDEV_TYPE_DISK, /* name of this vdev type */ + B_TRUE /* leaf vdev */ +}; + +/* + * Given the root disk device devid or pathname, read the label from + * the device, and construct a configuration nvlist. + */ +int +vdev_disk_read_rootlabel(char *devpath, char *devid, nvlist_t **config) +{ + ldi_handle_t vd_lh; + vdev_label_t *label; + uint64_t s, size; + int l; + ddi_devid_t tmpdevid; + int error = -1; + char *minor_name; + + /* + * Read the device label and build the nvlist. + */ + if (devid != NULL && ddi_devid_str_decode(devid, &tmpdevid, + &minor_name) == 0) { + error = ldi_open_by_devid(tmpdevid, minor_name, + FREAD, kcred, &vd_lh, zfs_li); + ddi_devid_free(tmpdevid); + ddi_devid_str_free(minor_name); + } + + if (error && (error = ldi_open_by_name(devpath, FREAD, kcred, &vd_lh, + zfs_li))) + return (error); + + if (ldi_get_size(vd_lh, &s)) { + (void) ldi_close(vd_lh, FREAD, kcred); + return (SET_ERROR(EIO)); + } + + size = P2ALIGN_TYPED(s, sizeof (vdev_label_t), uint64_t); + label = kmem_alloc(sizeof (vdev_label_t), KM_SLEEP); + + *config = NULL; + for (l = 0; l < VDEV_LABELS; l++) { + uint64_t offset, state, txg = 0; + + /* read vdev label */ + offset = vdev_label_offset(size, l, 0); + if (vdev_disk_ldi_physio(vd_lh, (caddr_t)label, + VDEV_SKIP_SIZE + VDEV_PHYS_SIZE, offset, B_READ) != 0) + continue; + + if (nvlist_unpack(label->vl_vdev_phys.vp_nvlist, + sizeof (label->vl_vdev_phys.vp_nvlist), config, 0) != 0) { + *config = NULL; + continue; + } + + if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_STATE, + &state) != 0 || state >= POOL_STATE_DESTROYED) { + nvlist_free(*config); + *config = NULL; + continue; + } + + if (nvlist_lookup_uint64(*config, ZPOOL_CONFIG_POOL_TXG, + &txg) != 0 || txg == 0) { + nvlist_free(*config); + *config = NULL; + continue; + } + + break; + } + + kmem_free(label, sizeof (vdev_label_t)); + (void) ldi_close(vd_lh, FREAD, kcred); + if (*config == NULL) + error = SET_ERROR(EIDRM); + + return (error); +} |