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 /* 22*98d1cbfeSGeorge Wilson * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23ea8dc4b6Seschrock */ 24ea8dc4b6Seschrock 25ea8dc4b6Seschrock /* 26ea8dc4b6Seschrock * ZFS fault injection 27ea8dc4b6Seschrock * 28ea8dc4b6Seschrock * To handle fault injection, we keep track of a series of zinject_record_t 29ea8dc4b6Seschrock * structures which describe which logical block(s) should be injected with a 30ea8dc4b6Seschrock * fault. These are kept in a global list. Each record corresponds to a given 31ea8dc4b6Seschrock * spa_t and maintains a special hold on the spa_t so that it cannot be deleted 32ea8dc4b6Seschrock * or exported while the injection record exists. 33ea8dc4b6Seschrock * 34ea8dc4b6Seschrock * Device level injection is done using the 'zi_guid' field. If this is set, it 35ea8dc4b6Seschrock * means that the error is destined for a particular device, not a piece of 36ea8dc4b6Seschrock * data. 37ea8dc4b6Seschrock * 38ea8dc4b6Seschrock * This is a rather poor data structure and algorithm, but we don't expect more 39ea8dc4b6Seschrock * than a few faults at any one time, so it should be sufficient for our needs. 40ea8dc4b6Seschrock */ 41ea8dc4b6Seschrock 42ea8dc4b6Seschrock #include <sys/arc.h> 43ea8dc4b6Seschrock #include <sys/zio_impl.h> 44ea8dc4b6Seschrock #include <sys/zfs_ioctl.h> 45ea8dc4b6Seschrock #include <sys/vdev_impl.h> 46b24ab676SJeff Bonwick #include <sys/dmu_objset.h> 4721bf64a7Sgw #include <sys/fs/zfs.h> 48ea8dc4b6Seschrock 49ea8dc4b6Seschrock uint32_t zio_injection_enabled; 50ea8dc4b6Seschrock 51ea8dc4b6Seschrock typedef struct inject_handler { 52ea8dc4b6Seschrock int zi_id; 53ea8dc4b6Seschrock spa_t *zi_spa; 54ea8dc4b6Seschrock zinject_record_t zi_record; 55ea8dc4b6Seschrock list_node_t zi_link; 56ea8dc4b6Seschrock } inject_handler_t; 57ea8dc4b6Seschrock 58ea8dc4b6Seschrock static list_t inject_handlers; 59ea8dc4b6Seschrock static krwlock_t inject_lock; 60ea8dc4b6Seschrock static int inject_next_id = 1; 61ea8dc4b6Seschrock 62ea8dc4b6Seschrock /* 63ea8dc4b6Seschrock * Returns true if the given record matches the I/O in progress. 64ea8dc4b6Seschrock */ 65ea8dc4b6Seschrock static boolean_t 66ea8dc4b6Seschrock zio_match_handler(zbookmark_t *zb, uint64_t type, 67ea8dc4b6Seschrock zinject_record_t *record, int error) 68ea8dc4b6Seschrock { 69ea8dc4b6Seschrock /* 70ea8dc4b6Seschrock * Check for a match against the MOS, which is based on type 71ea8dc4b6Seschrock */ 72b24ab676SJeff Bonwick if (zb->zb_objset == DMU_META_OBJSET && 73b24ab676SJeff Bonwick record->zi_objset == DMU_META_OBJSET && 74b24ab676SJeff Bonwick record->zi_object == DMU_META_DNODE_OBJECT) { 75ea8dc4b6Seschrock if (record->zi_type == DMU_OT_NONE || 76ea8dc4b6Seschrock type == record->zi_type) 77ea8dc4b6Seschrock return (record->zi_freq == 0 || 78ea8dc4b6Seschrock spa_get_random(100) < record->zi_freq); 79ea8dc4b6Seschrock else 80ea8dc4b6Seschrock return (B_FALSE); 81ea8dc4b6Seschrock } 82ea8dc4b6Seschrock 83ea8dc4b6Seschrock /* 84ea8dc4b6Seschrock * Check for an exact match. 85ea8dc4b6Seschrock */ 86ea8dc4b6Seschrock if (zb->zb_objset == record->zi_objset && 87ea8dc4b6Seschrock zb->zb_object == record->zi_object && 88ea8dc4b6Seschrock zb->zb_level == record->zi_level && 89ea8dc4b6Seschrock zb->zb_blkid >= record->zi_start && 90ea8dc4b6Seschrock zb->zb_blkid <= record->zi_end && 91ea8dc4b6Seschrock error == record->zi_error) 92ea8dc4b6Seschrock return (record->zi_freq == 0 || 93ea8dc4b6Seschrock spa_get_random(100) < record->zi_freq); 94ea8dc4b6Seschrock 95ea8dc4b6Seschrock return (B_FALSE); 96ea8dc4b6Seschrock } 97ea8dc4b6Seschrock 9888ecc943SGeorge Wilson /* 9988ecc943SGeorge Wilson * Panic the system when a config change happens in the function 10088ecc943SGeorge Wilson * specified by tag. 10188ecc943SGeorge Wilson */ 10288ecc943SGeorge Wilson void 1031195e687SMark J Musante zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type) 10488ecc943SGeorge Wilson { 10588ecc943SGeorge Wilson inject_handler_t *handler; 10688ecc943SGeorge Wilson 10788ecc943SGeorge Wilson rw_enter(&inject_lock, RW_READER); 10888ecc943SGeorge Wilson 10988ecc943SGeorge Wilson for (handler = list_head(&inject_handlers); handler != NULL; 11088ecc943SGeorge Wilson handler = list_next(&inject_handlers, handler)) { 11188ecc943SGeorge Wilson 11288ecc943SGeorge Wilson if (spa != handler->zi_spa) 11388ecc943SGeorge Wilson continue; 11488ecc943SGeorge Wilson 1151195e687SMark J Musante if (handler->zi_record.zi_type == type && 1161195e687SMark J Musante 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) 2413c708518SMark J Musante 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; 279*98d1cbfeSGeorge Wilson 280*98d1cbfeSGeorge Wilson /* 281*98d1cbfeSGeorge Wilson * Treat these errors as if they had been 282*98d1cbfeSGeorge Wilson * retried so that all the appropriate stats 283*98d1cbfeSGeorge Wilson * and FMA events are generated. 284*98d1cbfeSGeorge Wilson */ 285*98d1cbfeSGeorge Wilson if (!handler->zi_record.zi_failfast && 286*98d1cbfeSGeorge Wilson zio != NULL) 287*98d1cbfeSGeorge Wilson zio->io_flags |= ZIO_FLAG_IO_RETRY; 288*98d1cbfeSGeorge Wilson 289ea8dc4b6Seschrock ret = error; 290ea8dc4b6Seschrock break; 291ea8dc4b6Seschrock } 292ea8dc4b6Seschrock if (handler->zi_record.zi_error == ENXIO) { 293ea8dc4b6Seschrock ret = EIO; 294ea8dc4b6Seschrock break; 295ea8dc4b6Seschrock } 296ea8dc4b6Seschrock } 297ea8dc4b6Seschrock } 298ea8dc4b6Seschrock 299ea8dc4b6Seschrock rw_exit(&inject_lock); 300ea8dc4b6Seschrock 301ea8dc4b6Seschrock return (ret); 302ea8dc4b6Seschrock } 303ea8dc4b6Seschrock 304468c413aSTim Haley /* 305468c413aSTim Haley * Simulate hardware that ignores cache flushes. For requested number 306468c413aSTim Haley * of seconds nix the actual writing to disk. 307468c413aSTim Haley */ 308468c413aSTim Haley void 309468c413aSTim Haley zio_handle_ignored_writes(zio_t *zio) 310468c413aSTim Haley { 311468c413aSTim Haley inject_handler_t *handler; 312468c413aSTim Haley 313468c413aSTim Haley rw_enter(&inject_lock, RW_READER); 314468c413aSTim Haley 315468c413aSTim Haley for (handler = list_head(&inject_handlers); handler != NULL; 316468c413aSTim Haley handler = list_next(&inject_handlers, handler)) { 317468c413aSTim Haley 318468c413aSTim Haley /* Ignore errors not destined for this pool */ 319468c413aSTim Haley if (zio->io_spa != handler->zi_spa) 320468c413aSTim Haley continue; 321468c413aSTim Haley 322468c413aSTim Haley if (handler->zi_record.zi_duration == 0) 323468c413aSTim Haley continue; 324468c413aSTim Haley 325468c413aSTim Haley /* 326468c413aSTim Haley * Positive duration implies # of seconds, negative 327468c413aSTim Haley * a number of txgs 328468c413aSTim Haley */ 329468c413aSTim Haley if (handler->zi_record.zi_timer == 0) { 330468c413aSTim Haley if (handler->zi_record.zi_duration > 0) 331d3d50737SRafael Vanoni handler->zi_record.zi_timer = ddi_get_lbolt64(); 332468c413aSTim Haley else 333468c413aSTim Haley handler->zi_record.zi_timer = zio->io_txg; 334468c413aSTim Haley } 335a33cae98STim Haley 336a33cae98STim Haley /* Have a "problem" writing 60% of the time */ 337a33cae98STim Haley if (spa_get_random(100) < 60) 338a33cae98STim Haley zio->io_pipeline &= ~ZIO_VDEV_IO_STAGES; 339468c413aSTim Haley break; 340468c413aSTim Haley } 341468c413aSTim Haley 342468c413aSTim Haley rw_exit(&inject_lock); 343468c413aSTim Haley } 344468c413aSTim Haley 345468c413aSTim Haley void 346468c413aSTim Haley spa_handle_ignored_writes(spa_t *spa) 347468c413aSTim Haley { 348468c413aSTim Haley inject_handler_t *handler; 349468c413aSTim Haley 350468c413aSTim Haley if (zio_injection_enabled == 0) 351468c413aSTim Haley return; 352468c413aSTim Haley 353468c413aSTim Haley rw_enter(&inject_lock, RW_READER); 354468c413aSTim Haley 355468c413aSTim Haley for (handler = list_head(&inject_handlers); handler != NULL; 356468c413aSTim Haley handler = list_next(&inject_handlers, handler)) { 357468c413aSTim Haley 358468c413aSTim Haley /* Ignore errors not destined for this pool */ 359468c413aSTim Haley if (spa != handler->zi_spa) 360468c413aSTim Haley continue; 361468c413aSTim Haley 362468c413aSTim Haley if (handler->zi_record.zi_duration == 0) 363468c413aSTim Haley continue; 364468c413aSTim Haley 365468c413aSTim Haley if (handler->zi_record.zi_duration > 0) { 366468c413aSTim Haley VERIFY(handler->zi_record.zi_timer == 0 || 367468c413aSTim Haley handler->zi_record.zi_timer + 368d3d50737SRafael Vanoni handler->zi_record.zi_duration * hz > 369d3d50737SRafael Vanoni ddi_get_lbolt64()); 370468c413aSTim Haley } else { 371468c413aSTim Haley /* duration is negative so the subtraction here adds */ 372468c413aSTim Haley VERIFY(handler->zi_record.zi_timer == 0 || 373468c413aSTim Haley handler->zi_record.zi_timer - 374468c413aSTim Haley handler->zi_record.zi_duration >= 375b24ab676SJeff Bonwick spa_syncing_txg(spa)); 376468c413aSTim Haley } 377468c413aSTim Haley } 378468c413aSTim Haley 379468c413aSTim Haley rw_exit(&inject_lock); 380468c413aSTim Haley } 381468c413aSTim Haley 382ea8dc4b6Seschrock /* 383ea8dc4b6Seschrock * Create a new handler for the given record. We add it to the list, adding 384ea8dc4b6Seschrock * a reference to the spa_t in the process. We increment zio_injection_enabled, 385ea8dc4b6Seschrock * which is the switch to trigger all fault injection. 386ea8dc4b6Seschrock */ 387ea8dc4b6Seschrock int 388ea8dc4b6Seschrock zio_inject_fault(char *name, int flags, int *id, zinject_record_t *record) 389ea8dc4b6Seschrock { 390ea8dc4b6Seschrock inject_handler_t *handler; 391ea8dc4b6Seschrock int error; 392ea8dc4b6Seschrock spa_t *spa; 393ea8dc4b6Seschrock 394ea8dc4b6Seschrock /* 395ea8dc4b6Seschrock * If this is pool-wide metadata, make sure we unload the corresponding 396ea8dc4b6Seschrock * spa_t, so that the next attempt to load it will trigger the fault. 397ea8dc4b6Seschrock * We call spa_reset() to unload the pool appropriately. 398ea8dc4b6Seschrock */ 399ea8dc4b6Seschrock if (flags & ZINJECT_UNLOAD_SPA) 400ea8dc4b6Seschrock if ((error = spa_reset(name)) != 0) 401ea8dc4b6Seschrock return (error); 402ea8dc4b6Seschrock 403ea8dc4b6Seschrock if (!(flags & ZINJECT_NULL)) { 404ea8dc4b6Seschrock /* 405ea8dc4b6Seschrock * spa_inject_ref() will add an injection reference, which will 406ea8dc4b6Seschrock * prevent the pool from being removed from the namespace while 407ea8dc4b6Seschrock * still allowing it to be unloaded. 408ea8dc4b6Seschrock */ 409ea8dc4b6Seschrock if ((spa = spa_inject_addref(name)) == NULL) 410ea8dc4b6Seschrock return (ENOENT); 411ea8dc4b6Seschrock 412ea8dc4b6Seschrock handler = kmem_alloc(sizeof (inject_handler_t), KM_SLEEP); 413ea8dc4b6Seschrock 414ea8dc4b6Seschrock rw_enter(&inject_lock, RW_WRITER); 415ea8dc4b6Seschrock 416ea8dc4b6Seschrock *id = handler->zi_id = inject_next_id++; 417ea8dc4b6Seschrock handler->zi_spa = spa; 418ea8dc4b6Seschrock handler->zi_record = *record; 419ea8dc4b6Seschrock list_insert_tail(&inject_handlers, handler); 420ea8dc4b6Seschrock atomic_add_32(&zio_injection_enabled, 1); 421ea8dc4b6Seschrock 422ea8dc4b6Seschrock rw_exit(&inject_lock); 423ea8dc4b6Seschrock } 424ea8dc4b6Seschrock 425ea8dc4b6Seschrock /* 426ea8dc4b6Seschrock * Flush the ARC, so that any attempts to read this data will end up 427ea8dc4b6Seschrock * going to the ZIO layer. Note that this is a little overkill, but 428ea8dc4b6Seschrock * we don't have the necessary ARC interfaces to do anything else, and 429ea8dc4b6Seschrock * fault injection isn't a performance critical path. 430ea8dc4b6Seschrock */ 431ea8dc4b6Seschrock if (flags & ZINJECT_FLUSH_ARC) 432874395d5Smaybee arc_flush(NULL); 433ea8dc4b6Seschrock 434ea8dc4b6Seschrock return (0); 435ea8dc4b6Seschrock } 436ea8dc4b6Seschrock 437ea8dc4b6Seschrock /* 438ea8dc4b6Seschrock * Returns the next record with an ID greater than that supplied to the 439ea8dc4b6Seschrock * function. Used to iterate over all handlers in the system. 440ea8dc4b6Seschrock */ 441ea8dc4b6Seschrock int 442ea8dc4b6Seschrock zio_inject_list_next(int *id, char *name, size_t buflen, 443ea8dc4b6Seschrock zinject_record_t *record) 444ea8dc4b6Seschrock { 445ea8dc4b6Seschrock inject_handler_t *handler; 446ea8dc4b6Seschrock int ret; 447ea8dc4b6Seschrock 448ea8dc4b6Seschrock mutex_enter(&spa_namespace_lock); 449ea8dc4b6Seschrock rw_enter(&inject_lock, RW_READER); 450ea8dc4b6Seschrock 451ea8dc4b6Seschrock for (handler = list_head(&inject_handlers); handler != NULL; 452ea8dc4b6Seschrock handler = list_next(&inject_handlers, handler)) 453ea8dc4b6Seschrock if (handler->zi_id > *id) 454ea8dc4b6Seschrock break; 455ea8dc4b6Seschrock 456ea8dc4b6Seschrock if (handler) { 457ea8dc4b6Seschrock *record = handler->zi_record; 458ea8dc4b6Seschrock *id = handler->zi_id; 459ea8dc4b6Seschrock (void) strncpy(name, spa_name(handler->zi_spa), buflen); 460ea8dc4b6Seschrock ret = 0; 461ea8dc4b6Seschrock } else { 462ea8dc4b6Seschrock ret = ENOENT; 463ea8dc4b6Seschrock } 464ea8dc4b6Seschrock 465ea8dc4b6Seschrock rw_exit(&inject_lock); 466ea8dc4b6Seschrock mutex_exit(&spa_namespace_lock); 467ea8dc4b6Seschrock 468ea8dc4b6Seschrock return (ret); 469ea8dc4b6Seschrock } 470ea8dc4b6Seschrock 471ea8dc4b6Seschrock /* 472ea8dc4b6Seschrock * Clear the fault handler with the given identifier, or return ENOENT if none 473ea8dc4b6Seschrock * exists. 474ea8dc4b6Seschrock */ 475ea8dc4b6Seschrock int 476ea8dc4b6Seschrock zio_clear_fault(int id) 477ea8dc4b6Seschrock { 478ea8dc4b6Seschrock inject_handler_t *handler; 479ea8dc4b6Seschrock int ret; 480ea8dc4b6Seschrock 481ea8dc4b6Seschrock rw_enter(&inject_lock, RW_WRITER); 482ea8dc4b6Seschrock 483ea8dc4b6Seschrock for (handler = list_head(&inject_handlers); handler != NULL; 484ea8dc4b6Seschrock handler = list_next(&inject_handlers, handler)) 485ea8dc4b6Seschrock if (handler->zi_id == id) 486ea8dc4b6Seschrock break; 487ea8dc4b6Seschrock 488ea8dc4b6Seschrock if (handler == NULL) { 489ea8dc4b6Seschrock ret = ENOENT; 490ea8dc4b6Seschrock } else { 491ea8dc4b6Seschrock list_remove(&inject_handlers, handler); 492ea8dc4b6Seschrock spa_inject_delref(handler->zi_spa); 493ea8dc4b6Seschrock kmem_free(handler, sizeof (inject_handler_t)); 494ea8dc4b6Seschrock atomic_add_32(&zio_injection_enabled, -1); 495ea8dc4b6Seschrock ret = 0; 496ea8dc4b6Seschrock } 497ea8dc4b6Seschrock 498ea8dc4b6Seschrock rw_exit(&inject_lock); 499ea8dc4b6Seschrock 500ea8dc4b6Seschrock return (ret); 501ea8dc4b6Seschrock } 502ea8dc4b6Seschrock 503ea8dc4b6Seschrock void 504ea8dc4b6Seschrock zio_inject_init(void) 505ea8dc4b6Seschrock { 5069b3f6b42SEric Kustarz rw_init(&inject_lock, NULL, RW_DEFAULT, NULL); 507ea8dc4b6Seschrock list_create(&inject_handlers, sizeof (inject_handler_t), 508ea8dc4b6Seschrock offsetof(inject_handler_t, zi_link)); 509ea8dc4b6Seschrock } 510ea8dc4b6Seschrock 511ea8dc4b6Seschrock void 512ea8dc4b6Seschrock zio_inject_fini(void) 513ea8dc4b6Seschrock { 514ea8dc4b6Seschrock list_destroy(&inject_handlers); 5159b3f6b42SEric Kustarz rw_destroy(&inject_lock); 516ea8dc4b6Seschrock } 517