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e89bd69775
The zio_inject.c keeps zio_injection_enabled as a counter of fault handlers, so it should not be exported to user space as a module option. Several EXPORT_SYMBOLs are moved from zio.c to zio_inject.c, where the symbols are defined. Signed-off-by: Isaac Huang <he.huang@intel.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3199
536 lines
13 KiB
C
536 lines
13 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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2012, 2014 by Delphix. All rights reserved.
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*/
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/*
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* ZFS fault injection
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*
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* To handle fault injection, we keep track of a series of zinject_record_t
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* structures which describe which logical block(s) should be injected with a
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* fault. These are kept in a global list. Each record corresponds to a given
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* spa_t and maintains a special hold on the spa_t so that it cannot be deleted
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* or exported while the injection record exists.
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*
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* Device level injection is done using the 'zi_guid' field. If this is set, it
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* means that the error is destined for a particular device, not a piece of
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* data.
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*
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* This is a rather poor data structure and algorithm, but we don't expect more
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* than a few faults at any one time, so it should be sufficient for our needs.
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*/
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#include <sys/arc.h>
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#include <sys/zio_impl.h>
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#include <sys/zfs_ioctl.h>
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#include <sys/vdev_impl.h>
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#include <sys/dmu_objset.h>
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#include <sys/fs/zfs.h>
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uint32_t zio_injection_enabled = 0;
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typedef struct inject_handler {
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int zi_id;
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spa_t *zi_spa;
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zinject_record_t zi_record;
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list_node_t zi_link;
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} inject_handler_t;
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static list_t inject_handlers;
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static krwlock_t inject_lock;
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static int inject_next_id = 1;
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/*
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* Returns true if the given record matches the I/O in progress.
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*/
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static boolean_t
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zio_match_handler(zbookmark_phys_t *zb, uint64_t type,
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zinject_record_t *record, int error)
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{
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/*
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* Check for a match against the MOS, which is based on type
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*/
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if (zb->zb_objset == DMU_META_OBJSET &&
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record->zi_objset == DMU_META_OBJSET &&
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record->zi_object == DMU_META_DNODE_OBJECT) {
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if (record->zi_type == DMU_OT_NONE ||
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type == record->zi_type)
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return (record->zi_freq == 0 ||
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spa_get_random(100) < record->zi_freq);
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else
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return (B_FALSE);
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}
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/*
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* Check for an exact match.
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*/
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if (zb->zb_objset == record->zi_objset &&
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zb->zb_object == record->zi_object &&
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zb->zb_level == record->zi_level &&
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zb->zb_blkid >= record->zi_start &&
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zb->zb_blkid <= record->zi_end &&
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error == record->zi_error)
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return (record->zi_freq == 0 ||
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spa_get_random(100) < record->zi_freq);
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return (B_FALSE);
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}
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/*
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* Panic the system when a config change happens in the function
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* specified by tag.
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*/
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void
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zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type)
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{
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inject_handler_t *handler;
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rw_enter(&inject_lock, RW_READER);
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for (handler = list_head(&inject_handlers); handler != NULL;
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handler = list_next(&inject_handlers, handler)) {
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if (spa != handler->zi_spa)
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continue;
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if (handler->zi_record.zi_type == type &&
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strcmp(tag, handler->zi_record.zi_func) == 0)
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panic("Panic requested in function %s\n", tag);
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}
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rw_exit(&inject_lock);
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}
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/*
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* Determine if the I/O in question should return failure. Returns the errno
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* to be returned to the caller.
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*/
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int
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zio_handle_fault_injection(zio_t *zio, int error)
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{
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int ret = 0;
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inject_handler_t *handler;
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/*
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* Ignore I/O not associated with any logical data.
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*/
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if (zio->io_logical == NULL)
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return (0);
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/*
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* Currently, we only support fault injection on reads.
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*/
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if (zio->io_type != ZIO_TYPE_READ)
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return (0);
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rw_enter(&inject_lock, RW_READER);
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for (handler = list_head(&inject_handlers); handler != NULL;
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handler = list_next(&inject_handlers, handler)) {
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if (zio->io_spa != handler->zi_spa ||
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handler->zi_record.zi_cmd != ZINJECT_DATA_FAULT)
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continue;
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/* If this handler matches, return EIO */
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if (zio_match_handler(&zio->io_logical->io_bookmark,
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zio->io_bp ? BP_GET_TYPE(zio->io_bp) : DMU_OT_NONE,
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&handler->zi_record, error)) {
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ret = error;
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break;
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}
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}
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rw_exit(&inject_lock);
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return (ret);
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}
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/*
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* Determine if the zio is part of a label update and has an injection
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* handler associated with that portion of the label. Currently, we
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* allow error injection in either the nvlist or the uberblock region of
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* of the vdev label.
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*/
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int
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zio_handle_label_injection(zio_t *zio, int error)
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{
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inject_handler_t *handler;
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vdev_t *vd = zio->io_vd;
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uint64_t offset = zio->io_offset;
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int label;
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int ret = 0;
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if (offset >= VDEV_LABEL_START_SIZE &&
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offset < vd->vdev_psize - VDEV_LABEL_END_SIZE)
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return (0);
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rw_enter(&inject_lock, RW_READER);
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for (handler = list_head(&inject_handlers); handler != NULL;
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handler = list_next(&inject_handlers, handler)) {
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uint64_t start = handler->zi_record.zi_start;
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uint64_t end = handler->zi_record.zi_end;
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if (handler->zi_record.zi_cmd != ZINJECT_LABEL_FAULT)
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continue;
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/*
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* The injection region is the relative offsets within a
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* vdev label. We must determine the label which is being
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* updated and adjust our region accordingly.
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*/
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label = vdev_label_number(vd->vdev_psize, offset);
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start = vdev_label_offset(vd->vdev_psize, label, start);
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end = vdev_label_offset(vd->vdev_psize, label, end);
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if (zio->io_vd->vdev_guid == handler->zi_record.zi_guid &&
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(offset >= start && offset <= end)) {
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ret = error;
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break;
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}
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}
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rw_exit(&inject_lock);
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return (ret);
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}
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int
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zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error)
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{
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inject_handler_t *handler;
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int ret = 0;
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/*
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* We skip over faults in the labels unless it's during
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* device open (i.e. zio == NULL).
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*/
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if (zio != NULL) {
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uint64_t offset = zio->io_offset;
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if (offset < VDEV_LABEL_START_SIZE ||
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offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE)
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return (0);
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}
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rw_enter(&inject_lock, RW_READER);
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for (handler = list_head(&inject_handlers); handler != NULL;
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handler = list_next(&inject_handlers, handler)) {
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if (handler->zi_record.zi_cmd != ZINJECT_DEVICE_FAULT)
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continue;
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if (vd->vdev_guid == handler->zi_record.zi_guid) {
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if (handler->zi_record.zi_failfast &&
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(zio == NULL || (zio->io_flags &
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(ZIO_FLAG_IO_RETRY | ZIO_FLAG_TRYHARD)))) {
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continue;
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}
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/* Handle type specific I/O failures */
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if (zio != NULL &&
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handler->zi_record.zi_iotype != ZIO_TYPES &&
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handler->zi_record.zi_iotype != zio->io_type)
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continue;
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if (handler->zi_record.zi_error == error) {
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/*
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* For a failed open, pretend like the device
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* has gone away.
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*/
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if (error == ENXIO)
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vd->vdev_stat.vs_aux =
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VDEV_AUX_OPEN_FAILED;
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/*
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* Treat these errors as if they had been
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* retried so that all the appropriate stats
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* and FMA events are generated.
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*/
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if (!handler->zi_record.zi_failfast &&
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zio != NULL)
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zio->io_flags |= ZIO_FLAG_IO_RETRY;
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ret = error;
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break;
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}
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if (handler->zi_record.zi_error == ENXIO) {
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ret = SET_ERROR(EIO);
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break;
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}
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}
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}
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rw_exit(&inject_lock);
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return (ret);
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}
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/*
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* Simulate hardware that ignores cache flushes. For requested number
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* of seconds nix the actual writing to disk.
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*/
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void
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zio_handle_ignored_writes(zio_t *zio)
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{
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inject_handler_t *handler;
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rw_enter(&inject_lock, RW_READER);
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for (handler = list_head(&inject_handlers); handler != NULL;
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handler = list_next(&inject_handlers, handler)) {
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/* Ignore errors not destined for this pool */
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if (zio->io_spa != handler->zi_spa ||
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handler->zi_record.zi_cmd != ZINJECT_IGNORED_WRITES)
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continue;
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/*
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* Positive duration implies # of seconds, negative
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* a number of txgs
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*/
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if (handler->zi_record.zi_timer == 0) {
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if (handler->zi_record.zi_duration > 0)
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handler->zi_record.zi_timer = ddi_get_lbolt64();
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else
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handler->zi_record.zi_timer = zio->io_txg;
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}
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/* Have a "problem" writing 60% of the time */
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if (spa_get_random(100) < 60)
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zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES;
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break;
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}
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rw_exit(&inject_lock);
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}
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void
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spa_handle_ignored_writes(spa_t *spa)
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{
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inject_handler_t *handler;
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if (zio_injection_enabled == 0)
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return;
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rw_enter(&inject_lock, RW_READER);
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for (handler = list_head(&inject_handlers); handler != NULL;
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handler = list_next(&inject_handlers, handler)) {
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if (spa != handler->zi_spa ||
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handler->zi_record.zi_cmd != ZINJECT_IGNORED_WRITES)
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continue;
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if (handler->zi_record.zi_duration > 0) {
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VERIFY(handler->zi_record.zi_timer == 0 ||
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ddi_time_after64(
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(int64_t)handler->zi_record.zi_timer +
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handler->zi_record.zi_duration * hz,
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ddi_get_lbolt64()));
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} else {
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/* duration is negative so the subtraction here adds */
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VERIFY(handler->zi_record.zi_timer == 0 ||
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handler->zi_record.zi_timer -
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handler->zi_record.zi_duration >=
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spa_syncing_txg(spa));
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}
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}
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rw_exit(&inject_lock);
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}
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uint64_t
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zio_handle_io_delay(zio_t *zio)
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{
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vdev_t *vd = zio->io_vd;
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inject_handler_t *handler;
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uint64_t seconds = 0;
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if (zio_injection_enabled == 0)
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return (0);
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rw_enter(&inject_lock, RW_READER);
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for (handler = list_head(&inject_handlers); handler != NULL;
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handler = list_next(&inject_handlers, handler)) {
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if (handler->zi_record.zi_cmd != ZINJECT_DELAY_IO)
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continue;
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if (vd->vdev_guid == handler->zi_record.zi_guid) {
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seconds = handler->zi_record.zi_timer;
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break;
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}
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}
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rw_exit(&inject_lock);
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return (seconds);
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}
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/*
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* Create a new handler for the given record. We add it to the list, adding
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* a reference to the spa_t in the process. We increment zio_injection_enabled,
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* which is the switch to trigger all fault injection.
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*/
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int
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zio_inject_fault(char *name, int flags, int *id, zinject_record_t *record)
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{
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inject_handler_t *handler;
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int error;
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spa_t *spa;
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/*
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* If this is pool-wide metadata, make sure we unload the corresponding
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* spa_t, so that the next attempt to load it will trigger the fault.
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* We call spa_reset() to unload the pool appropriately.
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*/
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if (flags & ZINJECT_UNLOAD_SPA)
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if ((error = spa_reset(name)) != 0)
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return (error);
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if (!(flags & ZINJECT_NULL)) {
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/*
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* spa_inject_ref() will add an injection reference, which will
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* prevent the pool from being removed from the namespace while
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* still allowing it to be unloaded.
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*/
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if ((spa = spa_inject_addref(name)) == NULL)
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return (SET_ERROR(ENOENT));
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handler = kmem_alloc(sizeof (inject_handler_t), KM_SLEEP);
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rw_enter(&inject_lock, RW_WRITER);
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*id = handler->zi_id = inject_next_id++;
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handler->zi_spa = spa;
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handler->zi_record = *record;
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list_insert_tail(&inject_handlers, handler);
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atomic_add_32(&zio_injection_enabled, 1);
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rw_exit(&inject_lock);
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}
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/*
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* Flush the ARC, so that any attempts to read this data will end up
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* going to the ZIO layer. Note that this is a little overkill, but
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* we don't have the necessary ARC interfaces to do anything else, and
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* fault injection isn't a performance critical path.
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*/
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if (flags & ZINJECT_FLUSH_ARC)
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arc_flush(NULL);
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return (0);
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}
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/*
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* Returns the next record with an ID greater than that supplied to the
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* function. Used to iterate over all handlers in the system.
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*/
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int
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zio_inject_list_next(int *id, char *name, size_t buflen,
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zinject_record_t *record)
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{
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inject_handler_t *handler;
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int ret;
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mutex_enter(&spa_namespace_lock);
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rw_enter(&inject_lock, RW_READER);
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for (handler = list_head(&inject_handlers); handler != NULL;
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handler = list_next(&inject_handlers, handler))
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if (handler->zi_id > *id)
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break;
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if (handler) {
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*record = handler->zi_record;
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*id = handler->zi_id;
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(void) strncpy(name, spa_name(handler->zi_spa), buflen);
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ret = 0;
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} else {
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ret = SET_ERROR(ENOENT);
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}
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rw_exit(&inject_lock);
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mutex_exit(&spa_namespace_lock);
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return (ret);
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}
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/*
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* Clear the fault handler with the given identifier, or return ENOENT if none
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* exists.
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*/
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int
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zio_clear_fault(int id)
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{
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inject_handler_t *handler;
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rw_enter(&inject_lock, RW_WRITER);
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for (handler = list_head(&inject_handlers); handler != NULL;
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handler = list_next(&inject_handlers, handler))
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if (handler->zi_id == id)
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break;
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if (handler == NULL) {
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rw_exit(&inject_lock);
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return (SET_ERROR(ENOENT));
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}
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list_remove(&inject_handlers, handler);
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rw_exit(&inject_lock);
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spa_inject_delref(handler->zi_spa);
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kmem_free(handler, sizeof (inject_handler_t));
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atomic_add_32(&zio_injection_enabled, -1);
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return (0);
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}
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void
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zio_inject_init(void)
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{
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rw_init(&inject_lock, NULL, RW_DEFAULT, NULL);
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list_create(&inject_handlers, sizeof (inject_handler_t),
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offsetof(inject_handler_t, zi_link));
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}
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void
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zio_inject_fini(void)
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{
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list_destroy(&inject_handlers);
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rw_destroy(&inject_lock);
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}
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#if defined(_KERNEL) && defined(HAVE_SPL)
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EXPORT_SYMBOL(zio_injection_enabled);
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EXPORT_SYMBOL(zio_inject_fault);
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EXPORT_SYMBOL(zio_inject_list_next);
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EXPORT_SYMBOL(zio_clear_fault);
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EXPORT_SYMBOL(zio_handle_fault_injection);
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EXPORT_SYMBOL(zio_handle_device_injection);
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EXPORT_SYMBOL(zio_handle_label_injection);
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#endif
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