1ea8dc4b6Seschrock /* 2ea8dc4b6Seschrock * CDDL HEADER START 3ea8dc4b6Seschrock * 4ea8dc4b6Seschrock * The contents of this file are subject to the terms of the 5ea8dc4b6Seschrock * Common Development and Distribution License (the "License"). 6ea8dc4b6Seschrock * You may not use this file except in compliance with the License. 7ea8dc4b6Seschrock * 8ea8dc4b6Seschrock * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9ea8dc4b6Seschrock * or http://www.opensolaris.org/os/licensing. 10ea8dc4b6Seschrock * See the License for the specific language governing permissions 11ea8dc4b6Seschrock * and limitations under the License. 12ea8dc4b6Seschrock * 13ea8dc4b6Seschrock * When distributing Covered Code, include this CDDL HEADER in each 14ea8dc4b6Seschrock * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15ea8dc4b6Seschrock * If applicable, add the following below this CDDL HEADER, with the 16ea8dc4b6Seschrock * fields enclosed by brackets "[]" replaced with your own identifying 17ea8dc4b6Seschrock * information: Portions Copyright [yyyy] [name of copyright owner] 18ea8dc4b6Seschrock * 19ea8dc4b6Seschrock * CDDL HEADER END 20ea8dc4b6Seschrock */ 21ea8dc4b6Seschrock /* 228956713aSEric Schrock * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 23ea8dc4b6Seschrock * Use is subject to license terms. 24ea8dc4b6Seschrock */ 25ea8dc4b6Seschrock 26ea8dc4b6Seschrock /* 27ea8dc4b6Seschrock * ZFS fault injection 28ea8dc4b6Seschrock * 29ea8dc4b6Seschrock * To handle fault injection, we keep track of a series of zinject_record_t 30ea8dc4b6Seschrock * structures which describe which logical block(s) should be injected with a 31ea8dc4b6Seschrock * fault. These are kept in a global list. Each record corresponds to a given 32ea8dc4b6Seschrock * spa_t and maintains a special hold on the spa_t so that it cannot be deleted 33ea8dc4b6Seschrock * or exported while the injection record exists. 34ea8dc4b6Seschrock * 35ea8dc4b6Seschrock * Device level injection is done using the 'zi_guid' field. If this is set, it 36ea8dc4b6Seschrock * means that the error is destined for a particular device, not a piece of 37ea8dc4b6Seschrock * data. 38ea8dc4b6Seschrock * 39ea8dc4b6Seschrock * This is a rather poor data structure and algorithm, but we don't expect more 40ea8dc4b6Seschrock * than a few faults at any one time, so it should be sufficient for our needs. 41ea8dc4b6Seschrock */ 42ea8dc4b6Seschrock 43ea8dc4b6Seschrock #include <sys/arc.h> 44ea8dc4b6Seschrock #include <sys/zio_impl.h> 45ea8dc4b6Seschrock #include <sys/zfs_ioctl.h> 46ea8dc4b6Seschrock #include <sys/vdev_impl.h> 47*b24ab676SJeff Bonwick #include <sys/dmu_objset.h> 4821bf64a7Sgw #include <sys/fs/zfs.h> 49ea8dc4b6Seschrock 50ea8dc4b6Seschrock uint32_t zio_injection_enabled; 51ea8dc4b6Seschrock 52ea8dc4b6Seschrock typedef struct inject_handler { 53ea8dc4b6Seschrock int zi_id; 54ea8dc4b6Seschrock spa_t *zi_spa; 55ea8dc4b6Seschrock zinject_record_t zi_record; 56ea8dc4b6Seschrock list_node_t zi_link; 57ea8dc4b6Seschrock } inject_handler_t; 58ea8dc4b6Seschrock 59ea8dc4b6Seschrock static list_t inject_handlers; 60ea8dc4b6Seschrock static krwlock_t inject_lock; 61ea8dc4b6Seschrock static int inject_next_id = 1; 62ea8dc4b6Seschrock 63ea8dc4b6Seschrock /* 64ea8dc4b6Seschrock * Returns true if the given record matches the I/O in progress. 65ea8dc4b6Seschrock */ 66ea8dc4b6Seschrock static boolean_t 67ea8dc4b6Seschrock zio_match_handler(zbookmark_t *zb, uint64_t type, 68ea8dc4b6Seschrock zinject_record_t *record, int error) 69ea8dc4b6Seschrock { 70ea8dc4b6Seschrock /* 71ea8dc4b6Seschrock * Check for a match against the MOS, which is based on type 72ea8dc4b6Seschrock */ 73*b24ab676SJeff Bonwick if (zb->zb_objset == DMU_META_OBJSET && 74*b24ab676SJeff Bonwick record->zi_objset == DMU_META_OBJSET && 75*b24ab676SJeff Bonwick record->zi_object == DMU_META_DNODE_OBJECT) { 76ea8dc4b6Seschrock if (record->zi_type == DMU_OT_NONE || 77ea8dc4b6Seschrock type == record->zi_type) 78ea8dc4b6Seschrock return (record->zi_freq == 0 || 79ea8dc4b6Seschrock spa_get_random(100) < record->zi_freq); 80ea8dc4b6Seschrock else 81ea8dc4b6Seschrock return (B_FALSE); 82ea8dc4b6Seschrock } 83ea8dc4b6Seschrock 84ea8dc4b6Seschrock /* 85ea8dc4b6Seschrock * Check for an exact match. 86ea8dc4b6Seschrock */ 87ea8dc4b6Seschrock if (zb->zb_objset == record->zi_objset && 88ea8dc4b6Seschrock zb->zb_object == record->zi_object && 89ea8dc4b6Seschrock zb->zb_level == record->zi_level && 90ea8dc4b6Seschrock zb->zb_blkid >= record->zi_start && 91ea8dc4b6Seschrock zb->zb_blkid <= record->zi_end && 92ea8dc4b6Seschrock error == record->zi_error) 93ea8dc4b6Seschrock return (record->zi_freq == 0 || 94ea8dc4b6Seschrock spa_get_random(100) < record->zi_freq); 95ea8dc4b6Seschrock 96ea8dc4b6Seschrock return (B_FALSE); 97ea8dc4b6Seschrock } 98ea8dc4b6Seschrock 9988ecc943SGeorge Wilson /* 10088ecc943SGeorge Wilson * Panic the system when a config change happens in the function 10188ecc943SGeorge Wilson * specified by tag. 10288ecc943SGeorge Wilson */ 10388ecc943SGeorge Wilson void 10488ecc943SGeorge Wilson zio_handle_panic_injection(spa_t *spa, char *tag) 10588ecc943SGeorge Wilson { 10688ecc943SGeorge Wilson inject_handler_t *handler; 10788ecc943SGeorge Wilson 10888ecc943SGeorge Wilson rw_enter(&inject_lock, RW_READER); 10988ecc943SGeorge Wilson 11088ecc943SGeorge Wilson for (handler = list_head(&inject_handlers); handler != NULL; 11188ecc943SGeorge Wilson handler = list_next(&inject_handlers, handler)) { 11288ecc943SGeorge Wilson 11388ecc943SGeorge Wilson if (spa != handler->zi_spa) 11488ecc943SGeorge Wilson continue; 11588ecc943SGeorge Wilson 11688ecc943SGeorge Wilson if (strcmp(tag, handler->zi_record.zi_func) == 0) 11788ecc943SGeorge Wilson panic("Panic requested in function %s\n", tag); 11888ecc943SGeorge Wilson } 11988ecc943SGeorge Wilson 12088ecc943SGeorge Wilson rw_exit(&inject_lock); 12188ecc943SGeorge Wilson } 12288ecc943SGeorge Wilson 123ea8dc4b6Seschrock /* 124ea8dc4b6Seschrock * Determine if the I/O in question should return failure. Returns the errno 125ea8dc4b6Seschrock * to be returned to the caller. 126ea8dc4b6Seschrock */ 127ea8dc4b6Seschrock int 128ea8dc4b6Seschrock zio_handle_fault_injection(zio_t *zio, int error) 129ea8dc4b6Seschrock { 130ea8dc4b6Seschrock int ret = 0; 131ea8dc4b6Seschrock inject_handler_t *handler; 132ea8dc4b6Seschrock 133ea8dc4b6Seschrock /* 134ea8dc4b6Seschrock * Ignore I/O not associated with any logical data. 135ea8dc4b6Seschrock */ 136ea8dc4b6Seschrock if (zio->io_logical == NULL) 137ea8dc4b6Seschrock return (0); 138ea8dc4b6Seschrock 139ea8dc4b6Seschrock /* 140ea8dc4b6Seschrock * Currently, we only support fault injection on reads. 141ea8dc4b6Seschrock */ 142ea8dc4b6Seschrock if (zio->io_type != ZIO_TYPE_READ) 143ea8dc4b6Seschrock return (0); 144ea8dc4b6Seschrock 145ea8dc4b6Seschrock rw_enter(&inject_lock, RW_READER); 146ea8dc4b6Seschrock 147ea8dc4b6Seschrock for (handler = list_head(&inject_handlers); handler != NULL; 148ea8dc4b6Seschrock handler = list_next(&inject_handlers, handler)) { 149ea8dc4b6Seschrock 150ea8dc4b6Seschrock /* Ignore errors not destined for this pool */ 151ea8dc4b6Seschrock if (zio->io_spa != handler->zi_spa) 152ea8dc4b6Seschrock continue; 153ea8dc4b6Seschrock 15488ecc943SGeorge Wilson /* Ignore device errors and panic injection */ 15588ecc943SGeorge Wilson if (handler->zi_record.zi_guid != 0 || 156468c413aSTim Haley handler->zi_record.zi_func[0] != '\0' || 157468c413aSTim Haley handler->zi_record.zi_duration != 0) 158ea8dc4b6Seschrock continue; 159ea8dc4b6Seschrock 160ea8dc4b6Seschrock /* If this handler matches, return EIO */ 161ea8dc4b6Seschrock if (zio_match_handler(&zio->io_logical->io_bookmark, 162ea8dc4b6Seschrock zio->io_bp ? BP_GET_TYPE(zio->io_bp) : DMU_OT_NONE, 163ea8dc4b6Seschrock &handler->zi_record, error)) { 164ea8dc4b6Seschrock ret = error; 165ea8dc4b6Seschrock break; 166ea8dc4b6Seschrock } 167ea8dc4b6Seschrock } 168ea8dc4b6Seschrock 169ea8dc4b6Seschrock rw_exit(&inject_lock); 170ea8dc4b6Seschrock 171ea8dc4b6Seschrock return (ret); 172ea8dc4b6Seschrock } 173ea8dc4b6Seschrock 17421bf64a7Sgw /* 17521bf64a7Sgw * Determine if the zio is part of a label update and has an injection 17621bf64a7Sgw * handler associated with that portion of the label. Currently, we 17721bf64a7Sgw * allow error injection in either the nvlist or the uberblock region of 17821bf64a7Sgw * of the vdev label. 17921bf64a7Sgw */ 18021bf64a7Sgw int 18121bf64a7Sgw zio_handle_label_injection(zio_t *zio, int error) 18221bf64a7Sgw { 18321bf64a7Sgw inject_handler_t *handler; 18421bf64a7Sgw vdev_t *vd = zio->io_vd; 18521bf64a7Sgw uint64_t offset = zio->io_offset; 18621bf64a7Sgw int label; 18721bf64a7Sgw int ret = 0; 18821bf64a7Sgw 1898f18d1faSGeorge Wilson if (offset >= VDEV_LABEL_START_SIZE && 19021bf64a7Sgw offset < vd->vdev_psize - VDEV_LABEL_END_SIZE) 19121bf64a7Sgw return (0); 19221bf64a7Sgw 19321bf64a7Sgw rw_enter(&inject_lock, RW_READER); 19421bf64a7Sgw 19521bf64a7Sgw for (handler = list_head(&inject_handlers); handler != NULL; 19621bf64a7Sgw handler = list_next(&inject_handlers, handler)) { 19721bf64a7Sgw uint64_t start = handler->zi_record.zi_start; 19821bf64a7Sgw uint64_t end = handler->zi_record.zi_end; 19921bf64a7Sgw 20088ecc943SGeorge Wilson /* Ignore device only faults or panic injection */ 20188ecc943SGeorge Wilson if (handler->zi_record.zi_start == 0 || 202468c413aSTim Haley handler->zi_record.zi_func[0] != '\0' || 203468c413aSTim Haley handler->zi_record.zi_duration != 0) 20421bf64a7Sgw continue; 20521bf64a7Sgw 20621bf64a7Sgw /* 20721bf64a7Sgw * The injection region is the relative offsets within a 20821bf64a7Sgw * vdev label. We must determine the label which is being 20921bf64a7Sgw * updated and adjust our region accordingly. 21021bf64a7Sgw */ 21121bf64a7Sgw label = vdev_label_number(vd->vdev_psize, offset); 21221bf64a7Sgw start = vdev_label_offset(vd->vdev_psize, label, start); 21321bf64a7Sgw end = vdev_label_offset(vd->vdev_psize, label, end); 21421bf64a7Sgw 21521bf64a7Sgw if (zio->io_vd->vdev_guid == handler->zi_record.zi_guid && 21621bf64a7Sgw (offset >= start && offset <= end)) { 21721bf64a7Sgw ret = error; 21821bf64a7Sgw break; 21921bf64a7Sgw } 22021bf64a7Sgw } 22121bf64a7Sgw rw_exit(&inject_lock); 22221bf64a7Sgw return (ret); 22321bf64a7Sgw } 22421bf64a7Sgw 22521bf64a7Sgw 226ea8dc4b6Seschrock int 2278956713aSEric Schrock zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error) 228ea8dc4b6Seschrock { 229ea8dc4b6Seschrock inject_handler_t *handler; 230ea8dc4b6Seschrock int ret = 0; 231ea8dc4b6Seschrock 2328f18d1faSGeorge Wilson /* 2338f18d1faSGeorge Wilson * We skip over faults in the labels unless it's during 2348f18d1faSGeorge Wilson * device open (i.e. zio == NULL). 2358f18d1faSGeorge Wilson */ 2368f18d1faSGeorge Wilson if (zio != NULL) { 2378f18d1faSGeorge Wilson uint64_t offset = zio->io_offset; 2388f18d1faSGeorge Wilson 2398f18d1faSGeorge Wilson if (offset < VDEV_LABEL_START_SIZE || 2408f18d1faSGeorge Wilson offset >= vd->vdev_psize - VDEV_LABEL_END_SIZE) 2418f18d1faSGeorge Wilson return (0); 2428f18d1faSGeorge Wilson } 2438f18d1faSGeorge Wilson 244ea8dc4b6Seschrock rw_enter(&inject_lock, RW_READER); 245ea8dc4b6Seschrock 246ea8dc4b6Seschrock for (handler = list_head(&inject_handlers); handler != NULL; 247ea8dc4b6Seschrock handler = list_next(&inject_handlers, handler)) { 248ea8dc4b6Seschrock 249468c413aSTim Haley /* 250468c413aSTim Haley * Ignore label specific faults, panic injection 251468c413aSTim Haley * or fake writes 252468c413aSTim Haley */ 25388ecc943SGeorge Wilson if (handler->zi_record.zi_start != 0 || 254468c413aSTim Haley handler->zi_record.zi_func[0] != '\0' || 255468c413aSTim Haley handler->zi_record.zi_duration != 0) 25621bf64a7Sgw continue; 25721bf64a7Sgw 258ea8dc4b6Seschrock if (vd->vdev_guid == handler->zi_record.zi_guid) { 2598956713aSEric Schrock if (handler->zi_record.zi_failfast && 2608956713aSEric Schrock (zio == NULL || (zio->io_flags & 2618956713aSEric Schrock (ZIO_FLAG_IO_RETRY | ZIO_FLAG_TRYHARD)))) { 2628956713aSEric Schrock continue; 2638956713aSEric Schrock } 2648956713aSEric Schrock 2658f18d1faSGeorge Wilson /* Handle type specific I/O failures */ 2668f18d1faSGeorge Wilson if (zio != NULL && 2678f18d1faSGeorge Wilson handler->zi_record.zi_iotype != ZIO_TYPES && 2688f18d1faSGeorge Wilson handler->zi_record.zi_iotype != zio->io_type) 2698f18d1faSGeorge Wilson continue; 2708f18d1faSGeorge Wilson 271ea8dc4b6Seschrock if (handler->zi_record.zi_error == error) { 272ea8dc4b6Seschrock /* 273ea8dc4b6Seschrock * For a failed open, pretend like the device 274ea8dc4b6Seschrock * has gone away. 275ea8dc4b6Seschrock */ 276ea8dc4b6Seschrock if (error == ENXIO) 277ea8dc4b6Seschrock vd->vdev_stat.vs_aux = 278ea8dc4b6Seschrock VDEV_AUX_OPEN_FAILED; 279ea8dc4b6Seschrock ret = error; 280ea8dc4b6Seschrock break; 281ea8dc4b6Seschrock } 282ea8dc4b6Seschrock if (handler->zi_record.zi_error == ENXIO) { 283ea8dc4b6Seschrock ret = EIO; 284ea8dc4b6Seschrock break; 285ea8dc4b6Seschrock } 286ea8dc4b6Seschrock } 287ea8dc4b6Seschrock } 288ea8dc4b6Seschrock 289ea8dc4b6Seschrock rw_exit(&inject_lock); 290ea8dc4b6Seschrock 291ea8dc4b6Seschrock return (ret); 292ea8dc4b6Seschrock } 293ea8dc4b6Seschrock 294468c413aSTim Haley /* 295468c413aSTim Haley * Simulate hardware that ignores cache flushes. For requested number 296468c413aSTim Haley * of seconds nix the actual writing to disk. 297468c413aSTim Haley */ 298468c413aSTim Haley void 299468c413aSTim Haley zio_handle_ignored_writes(zio_t *zio) 300468c413aSTim Haley { 301468c413aSTim Haley inject_handler_t *handler; 302468c413aSTim Haley 303468c413aSTim Haley rw_enter(&inject_lock, RW_READER); 304468c413aSTim Haley 305468c413aSTim Haley for (handler = list_head(&inject_handlers); handler != NULL; 306468c413aSTim Haley handler = list_next(&inject_handlers, handler)) { 307468c413aSTim Haley 308468c413aSTim Haley /* Ignore errors not destined for this pool */ 309468c413aSTim Haley if (zio->io_spa != handler->zi_spa) 310468c413aSTim Haley continue; 311468c413aSTim Haley 312468c413aSTim Haley if (handler->zi_record.zi_duration == 0) 313468c413aSTim Haley continue; 314468c413aSTim Haley 315468c413aSTim Haley /* 316468c413aSTim Haley * Positive duration implies # of seconds, negative 317468c413aSTim Haley * a number of txgs 318468c413aSTim Haley */ 319468c413aSTim Haley if (handler->zi_record.zi_timer == 0) { 320468c413aSTim Haley if (handler->zi_record.zi_duration > 0) 321468c413aSTim Haley handler->zi_record.zi_timer = lbolt64; 322468c413aSTim Haley else 323468c413aSTim Haley handler->zi_record.zi_timer = zio->io_txg; 324468c413aSTim Haley } 325468c413aSTim Haley zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; 326468c413aSTim Haley break; 327468c413aSTim Haley } 328468c413aSTim Haley 329468c413aSTim Haley rw_exit(&inject_lock); 330468c413aSTim Haley } 331468c413aSTim Haley 332468c413aSTim Haley void 333468c413aSTim Haley spa_handle_ignored_writes(spa_t *spa) 334468c413aSTim Haley { 335468c413aSTim Haley inject_handler_t *handler; 336468c413aSTim Haley 337468c413aSTim Haley if (zio_injection_enabled == 0) 338468c413aSTim Haley return; 339468c413aSTim Haley 340468c413aSTim Haley rw_enter(&inject_lock, RW_READER); 341468c413aSTim Haley 342468c413aSTim Haley for (handler = list_head(&inject_handlers); handler != NULL; 343468c413aSTim Haley handler = list_next(&inject_handlers, handler)) { 344468c413aSTim Haley 345468c413aSTim Haley /* Ignore errors not destined for this pool */ 346468c413aSTim Haley if (spa != handler->zi_spa) 347468c413aSTim Haley continue; 348468c413aSTim Haley 349468c413aSTim Haley if (handler->zi_record.zi_duration == 0) 350468c413aSTim Haley continue; 351468c413aSTim Haley 352468c413aSTim Haley if (handler->zi_record.zi_duration > 0) { 353468c413aSTim Haley VERIFY(handler->zi_record.zi_timer == 0 || 354468c413aSTim Haley handler->zi_record.zi_timer + 355468c413aSTim Haley handler->zi_record.zi_duration * hz > lbolt64); 356468c413aSTim Haley } else { 357468c413aSTim Haley /* duration is negative so the subtraction here adds */ 358468c413aSTim Haley VERIFY(handler->zi_record.zi_timer == 0 || 359468c413aSTim Haley handler->zi_record.zi_timer - 360468c413aSTim Haley handler->zi_record.zi_duration >= 361*b24ab676SJeff Bonwick spa_syncing_txg(spa)); 362468c413aSTim Haley } 363468c413aSTim Haley } 364468c413aSTim Haley 365468c413aSTim Haley rw_exit(&inject_lock); 366468c413aSTim Haley } 367468c413aSTim Haley 368ea8dc4b6Seschrock /* 369ea8dc4b6Seschrock * Create a new handler for the given record. We add it to the list, adding 370ea8dc4b6Seschrock * a reference to the spa_t in the process. We increment zio_injection_enabled, 371ea8dc4b6Seschrock * which is the switch to trigger all fault injection. 372ea8dc4b6Seschrock */ 373ea8dc4b6Seschrock int 374ea8dc4b6Seschrock zio_inject_fault(char *name, int flags, int *id, zinject_record_t *record) 375ea8dc4b6Seschrock { 376ea8dc4b6Seschrock inject_handler_t *handler; 377ea8dc4b6Seschrock int error; 378ea8dc4b6Seschrock spa_t *spa; 379ea8dc4b6Seschrock 380ea8dc4b6Seschrock /* 381ea8dc4b6Seschrock * If this is pool-wide metadata, make sure we unload the corresponding 382ea8dc4b6Seschrock * spa_t, so that the next attempt to load it will trigger the fault. 383ea8dc4b6Seschrock * We call spa_reset() to unload the pool appropriately. 384ea8dc4b6Seschrock */ 385ea8dc4b6Seschrock if (flags & ZINJECT_UNLOAD_SPA) 386ea8dc4b6Seschrock if ((error = spa_reset(name)) != 0) 387ea8dc4b6Seschrock return (error); 388ea8dc4b6Seschrock 389ea8dc4b6Seschrock if (!(flags & ZINJECT_NULL)) { 390ea8dc4b6Seschrock /* 391ea8dc4b6Seschrock * spa_inject_ref() will add an injection reference, which will 392ea8dc4b6Seschrock * prevent the pool from being removed from the namespace while 393ea8dc4b6Seschrock * still allowing it to be unloaded. 394ea8dc4b6Seschrock */ 395ea8dc4b6Seschrock if ((spa = spa_inject_addref(name)) == NULL) 396ea8dc4b6Seschrock return (ENOENT); 397ea8dc4b6Seschrock 398ea8dc4b6Seschrock handler = kmem_alloc(sizeof (inject_handler_t), KM_SLEEP); 399ea8dc4b6Seschrock 400ea8dc4b6Seschrock rw_enter(&inject_lock, RW_WRITER); 401ea8dc4b6Seschrock 402ea8dc4b6Seschrock *id = handler->zi_id = inject_next_id++; 403ea8dc4b6Seschrock handler->zi_spa = spa; 404ea8dc4b6Seschrock handler->zi_record = *record; 405ea8dc4b6Seschrock list_insert_tail(&inject_handlers, handler); 406ea8dc4b6Seschrock atomic_add_32(&zio_injection_enabled, 1); 407ea8dc4b6Seschrock 408ea8dc4b6Seschrock rw_exit(&inject_lock); 409ea8dc4b6Seschrock } 410ea8dc4b6Seschrock 411ea8dc4b6Seschrock /* 412ea8dc4b6Seschrock * Flush the ARC, so that any attempts to read this data will end up 413ea8dc4b6Seschrock * going to the ZIO layer. Note that this is a little overkill, but 414ea8dc4b6Seschrock * we don't have the necessary ARC interfaces to do anything else, and 415ea8dc4b6Seschrock * fault injection isn't a performance critical path. 416ea8dc4b6Seschrock */ 417ea8dc4b6Seschrock if (flags & ZINJECT_FLUSH_ARC) 418874395d5Smaybee arc_flush(NULL); 419ea8dc4b6Seschrock 420ea8dc4b6Seschrock return (0); 421ea8dc4b6Seschrock } 422ea8dc4b6Seschrock 423ea8dc4b6Seschrock /* 424ea8dc4b6Seschrock * Returns the next record with an ID greater than that supplied to the 425ea8dc4b6Seschrock * function. Used to iterate over all handlers in the system. 426ea8dc4b6Seschrock */ 427ea8dc4b6Seschrock int 428ea8dc4b6Seschrock zio_inject_list_next(int *id, char *name, size_t buflen, 429ea8dc4b6Seschrock zinject_record_t *record) 430ea8dc4b6Seschrock { 431ea8dc4b6Seschrock inject_handler_t *handler; 432ea8dc4b6Seschrock int ret; 433ea8dc4b6Seschrock 434ea8dc4b6Seschrock mutex_enter(&spa_namespace_lock); 435ea8dc4b6Seschrock rw_enter(&inject_lock, RW_READER); 436ea8dc4b6Seschrock 437ea8dc4b6Seschrock for (handler = list_head(&inject_handlers); handler != NULL; 438ea8dc4b6Seschrock handler = list_next(&inject_handlers, handler)) 439ea8dc4b6Seschrock if (handler->zi_id > *id) 440ea8dc4b6Seschrock break; 441ea8dc4b6Seschrock 442ea8dc4b6Seschrock if (handler) { 443ea8dc4b6Seschrock *record = handler->zi_record; 444ea8dc4b6Seschrock *id = handler->zi_id; 445ea8dc4b6Seschrock (void) strncpy(name, spa_name(handler->zi_spa), buflen); 446ea8dc4b6Seschrock ret = 0; 447ea8dc4b6Seschrock } else { 448ea8dc4b6Seschrock ret = ENOENT; 449ea8dc4b6Seschrock } 450ea8dc4b6Seschrock 451ea8dc4b6Seschrock rw_exit(&inject_lock); 452ea8dc4b6Seschrock mutex_exit(&spa_namespace_lock); 453ea8dc4b6Seschrock 454ea8dc4b6Seschrock return (ret); 455ea8dc4b6Seschrock } 456ea8dc4b6Seschrock 457ea8dc4b6Seschrock /* 458ea8dc4b6Seschrock * Clear the fault handler with the given identifier, or return ENOENT if none 459ea8dc4b6Seschrock * exists. 460ea8dc4b6Seschrock */ 461ea8dc4b6Seschrock int 462ea8dc4b6Seschrock zio_clear_fault(int id) 463ea8dc4b6Seschrock { 464ea8dc4b6Seschrock inject_handler_t *handler; 465ea8dc4b6Seschrock int ret; 466ea8dc4b6Seschrock 467ea8dc4b6Seschrock rw_enter(&inject_lock, RW_WRITER); 468ea8dc4b6Seschrock 469ea8dc4b6Seschrock for (handler = list_head(&inject_handlers); handler != NULL; 470ea8dc4b6Seschrock handler = list_next(&inject_handlers, handler)) 471ea8dc4b6Seschrock if (handler->zi_id == id) 472ea8dc4b6Seschrock break; 473ea8dc4b6Seschrock 474ea8dc4b6Seschrock if (handler == NULL) { 475ea8dc4b6Seschrock ret = ENOENT; 476ea8dc4b6Seschrock } else { 477ea8dc4b6Seschrock list_remove(&inject_handlers, handler); 478ea8dc4b6Seschrock spa_inject_delref(handler->zi_spa); 479ea8dc4b6Seschrock kmem_free(handler, sizeof (inject_handler_t)); 480ea8dc4b6Seschrock atomic_add_32(&zio_injection_enabled, -1); 481ea8dc4b6Seschrock ret = 0; 482ea8dc4b6Seschrock } 483ea8dc4b6Seschrock 484ea8dc4b6Seschrock rw_exit(&inject_lock); 485ea8dc4b6Seschrock 486ea8dc4b6Seschrock return (ret); 487ea8dc4b6Seschrock } 488ea8dc4b6Seschrock 489ea8dc4b6Seschrock void 490ea8dc4b6Seschrock zio_inject_init(void) 491ea8dc4b6Seschrock { 4929b3f6b42SEric Kustarz rw_init(&inject_lock, NULL, RW_DEFAULT, NULL); 493ea8dc4b6Seschrock list_create(&inject_handlers, sizeof (inject_handler_t), 494ea8dc4b6Seschrock offsetof(inject_handler_t, zi_link)); 495ea8dc4b6Seschrock } 496ea8dc4b6Seschrock 497ea8dc4b6Seschrock void 498ea8dc4b6Seschrock zio_inject_fini(void) 499ea8dc4b6Seschrock { 500ea8dc4b6Seschrock list_destroy(&inject_handlers); 5019b3f6b42SEric Kustarz rw_destroy(&inject_lock); 502ea8dc4b6Seschrock } 503