1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #include <sys/spa.h> 27 #include <sys/spa_impl.h> 28 #include <sys/vdev.h> 29 #include <sys/vdev_impl.h> 30 #include <sys/zio.h> 31 32 #include <sys/fm/fs/zfs.h> 33 #include <sys/fm/protocol.h> 34 #include <sys/fm/util.h> 35 #include <sys/sysevent.h> 36 37 /* 38 * This general routine is responsible for generating all the different ZFS 39 * ereports. The payload is dependent on the class, and which arguments are 40 * supplied to the function: 41 * 42 * EREPORT POOL VDEV IO 43 * block X X X 44 * data X X 45 * device X X 46 * pool X 47 * 48 * If we are in a loading state, all errors are chained together by the same 49 * SPA-wide ENA (Error Numeric Association). 50 * 51 * For isolated I/O requests, we get the ENA from the zio_t. The propagation 52 * gets very complicated due to RAID-Z, gang blocks, and vdev caching. We want 53 * to chain together all ereports associated with a logical piece of data. For 54 * read I/Os, there are basically three 'types' of I/O, which form a roughly 55 * layered diagram: 56 * 57 * +---------------+ 58 * | Aggregate I/O | No associated logical data or device 59 * +---------------+ 60 * | 61 * V 62 * +---------------+ Reads associated with a piece of logical data. 63 * | Read I/O | This includes reads on behalf of RAID-Z, 64 * +---------------+ mirrors, gang blocks, retries, etc. 65 * | 66 * V 67 * +---------------+ Reads associated with a particular device, but 68 * | Physical I/O | no logical data. Issued as part of vdev caching 69 * +---------------+ and I/O aggregation. 70 * 71 * Note that 'physical I/O' here is not the same terminology as used in the rest 72 * of ZIO. Typically, 'physical I/O' simply means that there is no attached 73 * blockpointer. But I/O with no associated block pointer can still be related 74 * to a logical piece of data (i.e. RAID-Z requests). 75 * 76 * Purely physical I/O always have unique ENAs. They are not related to a 77 * particular piece of logical data, and therefore cannot be chained together. 78 * We still generate an ereport, but the DE doesn't correlate it with any 79 * logical piece of data. When such an I/O fails, the delegated I/O requests 80 * will issue a retry, which will trigger the 'real' ereport with the correct 81 * ENA. 82 * 83 * We keep track of the ENA for a ZIO chain through the 'io_logical' member. 84 * When a new logical I/O is issued, we set this to point to itself. Child I/Os 85 * then inherit this pointer, so that when it is first set subsequent failures 86 * will use the same ENA. For vdev cache fill and queue aggregation I/O, 87 * this pointer is set to NULL, and no ereport will be generated (since it 88 * doesn't actually correspond to any particular device or piece of data, 89 * and the caller will always retry without caching or queueing anyway). 90 */ 91 void 92 zfs_ereport_post(const char *subclass, spa_t *spa, vdev_t *vd, zio_t *zio, 93 uint64_t stateoroffset, uint64_t size) 94 { 95 #ifdef _KERNEL 96 nvlist_t *ereport, *detector; 97 uint64_t ena; 98 char class[64]; 99 100 /* 101 * If we are doing a spa_tryimport(), ignore errors. 102 */ 103 if (spa->spa_load_state == SPA_LOAD_TRYIMPORT) 104 return; 105 106 /* 107 * If we are in the middle of opening a pool, and the previous attempt 108 * failed, don't bother logging any new ereports - we're just going to 109 * get the same diagnosis anyway. 110 */ 111 if (spa->spa_load_state != SPA_LOAD_NONE && 112 spa->spa_last_open_failed) 113 return; 114 115 if (zio != NULL) { 116 /* 117 * If this is not a read or write zio, ignore the error. This 118 * can occur if the DKIOCFLUSHWRITECACHE ioctl fails. 119 */ 120 if (zio->io_type != ZIO_TYPE_READ && 121 zio->io_type != ZIO_TYPE_WRITE) 122 return; 123 124 /* 125 * Ignore any errors from speculative I/Os, as failure is an 126 * expected result. 127 */ 128 if (zio->io_flags & ZIO_FLAG_SPECULATIVE) 129 return; 130 131 if (vd != NULL) { 132 /* 133 * If the vdev has already been marked as failing due 134 * to a failed probe, then ignore any subsequent I/O 135 * errors, as the DE will automatically fault the vdev 136 * on the first such failure. This also catches cases 137 * where vdev_remove_wanted is set and the device has 138 * not yet been asynchronously placed into the REMOVED 139 * state. 140 */ 141 if (zio->io_vd == vd && 142 !vdev_accessible(vd, zio) && 143 strcmp(subclass, FM_EREPORT_ZFS_PROBE_FAILURE) != 0) 144 return; 145 146 /* 147 * Ignore checksum errors for reads from DTL regions of 148 * leaf vdevs. 149 */ 150 if (zio->io_type == ZIO_TYPE_READ && 151 zio->io_error == ECKSUM && 152 vd->vdev_ops->vdev_op_leaf && 153 vdev_dtl_contains(vd, DTL_MISSING, zio->io_txg, 1)) 154 return; 155 } 156 } 157 158 if ((ereport = fm_nvlist_create(NULL)) == NULL) 159 return; 160 161 if ((detector = fm_nvlist_create(NULL)) == NULL) { 162 fm_nvlist_destroy(ereport, FM_NVA_FREE); 163 return; 164 } 165 166 /* 167 * Serialize ereport generation 168 */ 169 mutex_enter(&spa->spa_errlist_lock); 170 171 /* 172 * Determine the ENA to use for this event. If we are in a loading 173 * state, use a SPA-wide ENA. Otherwise, if we are in an I/O state, use 174 * a root zio-wide ENA. Otherwise, simply use a unique ENA. 175 */ 176 if (spa->spa_load_state != SPA_LOAD_NONE) { 177 if (spa->spa_ena == 0) 178 spa->spa_ena = fm_ena_generate(0, FM_ENA_FMT1); 179 ena = spa->spa_ena; 180 } else if (zio != NULL && zio->io_logical != NULL) { 181 if (zio->io_logical->io_ena == 0) 182 zio->io_logical->io_ena = 183 fm_ena_generate(0, FM_ENA_FMT1); 184 ena = zio->io_logical->io_ena; 185 } else { 186 ena = fm_ena_generate(0, FM_ENA_FMT1); 187 } 188 189 /* 190 * Construct the full class, detector, and other standard FMA fields. 191 */ 192 (void) snprintf(class, sizeof (class), "%s.%s", 193 ZFS_ERROR_CLASS, subclass); 194 195 fm_fmri_zfs_set(detector, FM_ZFS_SCHEME_VERSION, spa_guid(spa), 196 vd != NULL ? vd->vdev_guid : 0); 197 198 fm_ereport_set(ereport, FM_EREPORT_VERSION, class, ena, detector, NULL); 199 200 /* 201 * Construct the per-ereport payload, depending on which parameters are 202 * passed in. 203 */ 204 205 /* 206 * Generic payload members common to all ereports. 207 */ 208 fm_payload_set(ereport, FM_EREPORT_PAYLOAD_ZFS_POOL, 209 DATA_TYPE_STRING, spa_name(spa), FM_EREPORT_PAYLOAD_ZFS_POOL_GUID, 210 DATA_TYPE_UINT64, spa_guid(spa), 211 FM_EREPORT_PAYLOAD_ZFS_POOL_CONTEXT, DATA_TYPE_INT32, 212 spa->spa_load_state, NULL); 213 214 if (spa != NULL) { 215 fm_payload_set(ereport, FM_EREPORT_PAYLOAD_ZFS_POOL_FAILMODE, 216 DATA_TYPE_STRING, 217 spa_get_failmode(spa) == ZIO_FAILURE_MODE_WAIT ? 218 FM_EREPORT_FAILMODE_WAIT : 219 spa_get_failmode(spa) == ZIO_FAILURE_MODE_CONTINUE ? 220 FM_EREPORT_FAILMODE_CONTINUE : FM_EREPORT_FAILMODE_PANIC, 221 NULL); 222 } 223 224 if (vd != NULL) { 225 vdev_t *pvd = vd->vdev_parent; 226 227 fm_payload_set(ereport, FM_EREPORT_PAYLOAD_ZFS_VDEV_GUID, 228 DATA_TYPE_UINT64, vd->vdev_guid, 229 FM_EREPORT_PAYLOAD_ZFS_VDEV_TYPE, 230 DATA_TYPE_STRING, vd->vdev_ops->vdev_op_type, NULL); 231 if (vd->vdev_path != NULL) 232 fm_payload_set(ereport, 233 FM_EREPORT_PAYLOAD_ZFS_VDEV_PATH, 234 DATA_TYPE_STRING, vd->vdev_path, NULL); 235 if (vd->vdev_devid != NULL) 236 fm_payload_set(ereport, 237 FM_EREPORT_PAYLOAD_ZFS_VDEV_DEVID, 238 DATA_TYPE_STRING, vd->vdev_devid, NULL); 239 if (vd->vdev_fru != NULL) 240 fm_payload_set(ereport, 241 FM_EREPORT_PAYLOAD_ZFS_VDEV_FRU, 242 DATA_TYPE_STRING, vd->vdev_fru, NULL); 243 244 if (pvd != NULL) { 245 fm_payload_set(ereport, 246 FM_EREPORT_PAYLOAD_ZFS_PARENT_GUID, 247 DATA_TYPE_UINT64, pvd->vdev_guid, 248 FM_EREPORT_PAYLOAD_ZFS_PARENT_TYPE, 249 DATA_TYPE_STRING, pvd->vdev_ops->vdev_op_type, 250 NULL); 251 if (pvd->vdev_path) 252 fm_payload_set(ereport, 253 FM_EREPORT_PAYLOAD_ZFS_PARENT_PATH, 254 DATA_TYPE_STRING, pvd->vdev_path, NULL); 255 if (pvd->vdev_devid) 256 fm_payload_set(ereport, 257 FM_EREPORT_PAYLOAD_ZFS_PARENT_DEVID, 258 DATA_TYPE_STRING, pvd->vdev_devid, NULL); 259 } 260 } 261 262 if (zio != NULL) { 263 /* 264 * Payload common to all I/Os. 265 */ 266 fm_payload_set(ereport, FM_EREPORT_PAYLOAD_ZFS_ZIO_ERR, 267 DATA_TYPE_INT32, zio->io_error, NULL); 268 269 /* 270 * If the 'size' parameter is non-zero, it indicates this is a 271 * RAID-Z or other I/O where the physical offset and length are 272 * provided for us, instead of within the zio_t. 273 */ 274 if (vd != NULL) { 275 if (size) 276 fm_payload_set(ereport, 277 FM_EREPORT_PAYLOAD_ZFS_ZIO_OFFSET, 278 DATA_TYPE_UINT64, stateoroffset, 279 FM_EREPORT_PAYLOAD_ZFS_ZIO_SIZE, 280 DATA_TYPE_UINT64, size, NULL); 281 else 282 fm_payload_set(ereport, 283 FM_EREPORT_PAYLOAD_ZFS_ZIO_OFFSET, 284 DATA_TYPE_UINT64, zio->io_offset, 285 FM_EREPORT_PAYLOAD_ZFS_ZIO_SIZE, 286 DATA_TYPE_UINT64, zio->io_size, NULL); 287 } 288 289 /* 290 * Payload for I/Os with corresponding logical information. 291 */ 292 if (zio->io_logical != NULL) 293 fm_payload_set(ereport, 294 FM_EREPORT_PAYLOAD_ZFS_ZIO_OBJSET, 295 DATA_TYPE_UINT64, 296 zio->io_logical->io_bookmark.zb_objset, 297 FM_EREPORT_PAYLOAD_ZFS_ZIO_OBJECT, 298 DATA_TYPE_UINT64, 299 zio->io_logical->io_bookmark.zb_object, 300 FM_EREPORT_PAYLOAD_ZFS_ZIO_LEVEL, 301 DATA_TYPE_INT64, 302 zio->io_logical->io_bookmark.zb_level, 303 FM_EREPORT_PAYLOAD_ZFS_ZIO_BLKID, 304 DATA_TYPE_UINT64, 305 zio->io_logical->io_bookmark.zb_blkid, NULL); 306 } else if (vd != NULL) { 307 /* 308 * If we have a vdev but no zio, this is a device fault, and the 309 * 'stateoroffset' parameter indicates the previous state of the 310 * vdev. 311 */ 312 fm_payload_set(ereport, 313 FM_EREPORT_PAYLOAD_ZFS_PREV_STATE, 314 DATA_TYPE_UINT64, stateoroffset, NULL); 315 } 316 mutex_exit(&spa->spa_errlist_lock); 317 318 fm_ereport_post(ereport, EVCH_SLEEP); 319 320 fm_nvlist_destroy(ereport, FM_NVA_FREE); 321 fm_nvlist_destroy(detector, FM_NVA_FREE); 322 #endif 323 } 324 325 static void 326 zfs_post_common(spa_t *spa, vdev_t *vd, const char *name) 327 { 328 #ifdef _KERNEL 329 nvlist_t *resource; 330 char class[64]; 331 332 if ((resource = fm_nvlist_create(NULL)) == NULL) 333 return; 334 335 (void) snprintf(class, sizeof (class), "%s.%s.%s", FM_RSRC_RESOURCE, 336 ZFS_ERROR_CLASS, name); 337 VERIFY(nvlist_add_uint8(resource, FM_VERSION, FM_RSRC_VERSION) == 0); 338 VERIFY(nvlist_add_string(resource, FM_CLASS, class) == 0); 339 VERIFY(nvlist_add_uint64(resource, 340 FM_EREPORT_PAYLOAD_ZFS_POOL_GUID, spa_guid(spa)) == 0); 341 if (vd) 342 VERIFY(nvlist_add_uint64(resource, 343 FM_EREPORT_PAYLOAD_ZFS_VDEV_GUID, vd->vdev_guid) == 0); 344 345 fm_ereport_post(resource, EVCH_SLEEP); 346 347 fm_nvlist_destroy(resource, FM_NVA_FREE); 348 #endif 349 } 350 351 /* 352 * The 'resource.fs.zfs.removed' event is an internal signal that the given vdev 353 * has been removed from the system. This will cause the DE to ignore any 354 * recent I/O errors, inferring that they are due to the asynchronous device 355 * removal. 356 */ 357 void 358 zfs_post_remove(spa_t *spa, vdev_t *vd) 359 { 360 zfs_post_common(spa, vd, FM_RESOURCE_REMOVED); 361 } 362 363 /* 364 * The 'resource.fs.zfs.autoreplace' event is an internal signal that the pool 365 * has the 'autoreplace' property set, and therefore any broken vdevs will be 366 * handled by higher level logic, and no vdev fault should be generated. 367 */ 368 void 369 zfs_post_autoreplace(spa_t *spa, vdev_t *vd) 370 { 371 zfs_post_common(spa, vd, FM_RESOURCE_AUTOREPLACE); 372 } 373