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 2006 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include <sys/spa.h> 29 #include <sys/spa_impl.h> 30 #include <sys/vdev.h> 31 #include <sys/vdev_impl.h> 32 #include <sys/zio.h> 33 34 #include <sys/fm/fs/zfs.h> 35 #include <sys/fm/protocol.h> 36 #include <sys/fm/util.h> 37 #include <sys/sysevent.h> 38 39 /* 40 * This general routine is responsible for generating all the different ZFS 41 * ereports. The payload is dependent on the class, and which arguments are 42 * supplied to the function: 43 * 44 * EREPORT POOL VDEV IO 45 * block X X X 46 * data X X 47 * device X X 48 * pool X 49 * 50 * If we are in a loading state, all errors are chained together by the same 51 * SPA-wide ENA. 52 * 53 * For isolated I/O requests, we get the ENA from the zio_t. The propagation 54 * gets very complicated due to RAID-Z, gang blocks, and vdev caching. We want 55 * to chain together all ereports associated with a logical piece of data. For 56 * read I/Os, there are basically three 'types' of I/O, which form a roughly 57 * layered diagram: 58 * 59 * +---------------+ 60 * | Aggregate I/O | No associated logical data or device 61 * +---------------+ 62 * | 63 * V 64 * +---------------+ Reads associated with a piece of logical data. 65 * | Read I/O | This includes reads on behalf of RAID-Z, 66 * +---------------+ mirrors, gang blocks, retries, etc. 67 * | 68 * V 69 * +---------------+ Reads associated with a particular device, but 70 * | Physical I/O | no logical data. Issued as part of vdev caching 71 * +---------------+ and I/O aggregation. 72 * 73 * Note that 'physical I/O' here is not the same terminology as used in the rest 74 * of ZIO. Typically, 'physical I/O' simply means that there is no attached 75 * blockpointer. But I/O with no associated block pointer can still be related 76 * to a logical piece of data (i.e. RAID-Z requests). 77 * 78 * Purely physical I/O always have unique ENAs. They are not related to a 79 * particular piece of logical data, and therefore cannot be chained together. 80 * We still generate an ereport, but the DE doesn't correlate it with any 81 * logical piece of data. When such an I/O fails, the delegated I/O requests 82 * will issue a retry, which will trigger the 'real' ereport with the correct 83 * ENA. 84 * 85 * We keep track of the ENA for a ZIO chain through the 'io_logical' member. 86 * When a new logical I/O is issued, we set this to point to itself. Child I/Os 87 * then inherit this pointer, so that when it is first set subsequent failures 88 * will use the same ENA. If a physical I/O is issued (by passing the 89 * ZIO_FLAG_NOBOOKMARK flag), then this pointer is reset, guaranteeing that a 90 * unique ENA will be generated. For an aggregate I/O, this pointer is set to 91 * NULL, and no ereport will be generated (since it doesn't actually correspond 92 * to any particular device or piece of data). 93 */ 94 void 95 zfs_ereport_post(const char *subclass, spa_t *spa, vdev_t *vd, zio_t *zio, 96 uint64_t stateoroffset, uint64_t size) 97 { 98 #ifdef _KERNEL 99 nvlist_t *ereport, *detector; 100 uint64_t ena; 101 char class[64]; 102 103 /* 104 * If we are doing a spa_tryimport(), ignore errors. 105 */ 106 if (spa->spa_load_state == SPA_LOAD_TRYIMPORT) 107 return; 108 109 /* 110 * If we are in the middle of opening a pool, and the previous attempt 111 * failed, don't bother logging any new ereports - we're just going to 112 * get the same diagnosis anyway. 113 */ 114 if (spa->spa_load_state != SPA_LOAD_NONE && 115 spa->spa_last_open_failed) 116 return; 117 118 /* 119 * Ignore any errors from I/Os that we are going to retry anyway - we 120 * only generate errors from the final failure. 121 */ 122 if (zio && zio_should_retry(zio)) 123 return; 124 125 if ((ereport = fm_nvlist_create(NULL)) == NULL) 126 return; 127 128 if ((detector = fm_nvlist_create(NULL)) == NULL) { 129 fm_nvlist_destroy(ereport, FM_NVA_FREE); 130 return; 131 } 132 133 /* 134 * Serialize ereport generation 135 */ 136 mutex_enter(&spa->spa_errlist_lock); 137 138 /* 139 * Determine the ENA to use for this event. If we are in a loading 140 * state, use a SPA-wide ENA. Otherwise, if we are in an I/O state, use 141 * a root zio-wide ENA. Otherwise, simply use a unique ENA. 142 */ 143 if (spa->spa_load_state != SPA_LOAD_NONE) { 144 if (spa->spa_ena == 0) 145 spa->spa_ena = fm_ena_generate(0, FM_ENA_FMT1); 146 ena = spa->spa_ena; 147 } else if (zio != NULL && zio->io_logical != NULL) { 148 if (zio->io_logical->io_ena == 0) 149 zio->io_logical->io_ena = 150 fm_ena_generate(0, FM_ENA_FMT1); 151 ena = zio->io_logical->io_ena; 152 } else { 153 ena = fm_ena_generate(0, FM_ENA_FMT1); 154 } 155 156 /* 157 * Construct the full class, detector, and other standard FMA fields. 158 */ 159 (void) snprintf(class, sizeof (class), "%s.%s", 160 ZFS_ERROR_CLASS, subclass); 161 162 fm_fmri_zfs_set(detector, FM_ZFS_SCHEME_VERSION, spa_guid(spa), 163 vd != NULL ? vd->vdev_guid : 0); 164 165 fm_ereport_set(ereport, FM_EREPORT_VERSION, class, ena, detector, NULL); 166 167 /* 168 * Construct the per-ereport payload, depending on which parameters are 169 * passed in. 170 */ 171 172 /* 173 * Generic payload members common to all ereports. 174 * 175 * The direct reference to spa_name is used rather than spa_name() 176 * because of the asynchronous nature of the zio pipeline. spa_name() 177 * asserts that the config lock is held in some form. This is always 178 * the case in I/O context, but because the check for RW_WRITER compares 179 * against 'curthread', we may be in an asynchronous context and blow 180 * this assert. Rather than loosen this assert, we acknowledge that all 181 * contexts in which this function is called (pool open, I/O) are safe, 182 * and dereference the name directly. 183 */ 184 fm_payload_set(ereport, FM_EREPORT_PAYLOAD_ZFS_POOL, 185 DATA_TYPE_STRING, spa->spa_name, FM_EREPORT_PAYLOAD_ZFS_POOL_GUID, 186 DATA_TYPE_UINT64, spa_guid(spa), 187 FM_EREPORT_PAYLOAD_ZFS_POOL_CONTEXT, DATA_TYPE_INT32, 188 spa->spa_load_state, NULL); 189 190 if (vd != NULL) { 191 vdev_t *pvd = vd->vdev_parent; 192 193 fm_payload_set(ereport, FM_EREPORT_PAYLOAD_ZFS_VDEV_GUID, 194 DATA_TYPE_UINT64, vd->vdev_guid, 195 FM_EREPORT_PAYLOAD_ZFS_VDEV_TYPE, 196 DATA_TYPE_STRING, vd->vdev_ops->vdev_op_type, NULL); 197 if (vd->vdev_path) 198 fm_payload_set(ereport, 199 FM_EREPORT_PAYLOAD_ZFS_VDEV_PATH, 200 DATA_TYPE_STRING, vd->vdev_path, NULL); 201 if (vd->vdev_devid) 202 fm_payload_set(ereport, 203 FM_EREPORT_PAYLOAD_ZFS_VDEV_DEVID, 204 DATA_TYPE_STRING, vd->vdev_devid, NULL); 205 206 if (pvd != NULL) { 207 fm_payload_set(ereport, 208 FM_EREPORT_PAYLOAD_ZFS_PARENT_GUID, 209 DATA_TYPE_UINT64, pvd->vdev_guid, 210 FM_EREPORT_PAYLOAD_ZFS_PARENT_TYPE, 211 DATA_TYPE_STRING, pvd->vdev_ops->vdev_op_type, 212 NULL); 213 if (pvd->vdev_path) 214 fm_payload_set(ereport, 215 FM_EREPORT_PAYLOAD_ZFS_PARENT_PATH, 216 DATA_TYPE_STRING, vd->vdev_path, NULL); 217 if (pvd->vdev_devid) 218 fm_payload_set(ereport, 219 FM_EREPORT_PAYLOAD_ZFS_PARENT_DEVID, 220 DATA_TYPE_STRING, pvd->vdev_devid, NULL); 221 } 222 } 223 224 if (zio != NULL) { 225 /* 226 * Payload common to all I/Os. 227 */ 228 fm_payload_set(ereport, FM_EREPORT_PAYLOAD_ZFS_ZIO_ERR, 229 DATA_TYPE_INT32, zio->io_error, NULL); 230 231 /* 232 * If the 'size' parameter is non-zero, it indicates this is a 233 * RAID-Z or other I/O where the physical offset and length are 234 * provided for us, instead of within the zio_t. 235 */ 236 if (vd != NULL) { 237 if (size) 238 fm_payload_set(ereport, 239 FM_EREPORT_PAYLOAD_ZFS_ZIO_OFFSET, 240 DATA_TYPE_UINT64, stateoroffset, 241 FM_EREPORT_PAYLOAD_ZFS_ZIO_SIZE, 242 DATA_TYPE_UINT64, size); 243 else 244 fm_payload_set(ereport, 245 FM_EREPORT_PAYLOAD_ZFS_ZIO_OFFSET, 246 DATA_TYPE_UINT64, zio->io_offset, 247 FM_EREPORT_PAYLOAD_ZFS_ZIO_SIZE, 248 DATA_TYPE_UINT64, zio->io_size); 249 } 250 251 /* 252 * Payload for I/Os with corresponding logical information. 253 */ 254 if (zio->io_logical != NULL) 255 fm_payload_set(ereport, 256 FM_EREPORT_PAYLOAD_ZFS_ZIO_OBJSET, 257 DATA_TYPE_UINT64, 258 zio->io_logical->io_bookmark.zb_objset, 259 FM_EREPORT_PAYLOAD_ZFS_ZIO_OBJECT, 260 DATA_TYPE_UINT64, 261 zio->io_logical->io_bookmark.zb_object, 262 FM_EREPORT_PAYLOAD_ZFS_ZIO_LEVEL, 263 DATA_TYPE_INT32, 264 zio->io_logical->io_bookmark.zb_level, 265 FM_EREPORT_PAYLOAD_ZFS_ZIO_BLKID, 266 DATA_TYPE_UINT64, 267 zio->io_logical->io_bookmark.zb_blkid); 268 } else if (vd != NULL) { 269 /* 270 * If we have a vdev but no zio, this is a device fault, and the 271 * 'stateoroffset' parameter indicates the previous state of the 272 * vdev. 273 */ 274 fm_payload_set(ereport, 275 FM_EREPORT_PAYLOAD_ZFS_PREV_STATE, 276 DATA_TYPE_UINT64, stateoroffset, NULL); 277 } 278 mutex_exit(&spa->spa_errlist_lock); 279 280 fm_ereport_post(ereport, EVCH_SLEEP); 281 282 fm_nvlist_destroy(ereport, FM_NVA_FREE); 283 fm_nvlist_destroy(detector, FM_NVA_FREE); 284 #endif 285 } 286 287 /* 288 * The 'resource.fs.zfs.ok' event is an internal signal that the associated 289 * resource (pool or disk) has been identified by ZFS as healthy. This will 290 * then trigger the DE to close the associated case, if any. 291 */ 292 void 293 zfs_post_ok(spa_t *spa, vdev_t *vd) 294 { 295 #ifdef _KERNEL 296 nvlist_t *resource; 297 char class[64]; 298 299 if ((resource = fm_nvlist_create(NULL)) == NULL) 300 return; 301 302 (void) snprintf(class, sizeof (class), "%s.%s.%s", FM_RSRC_RESOURCE, 303 ZFS_ERROR_CLASS, FM_RESOURCE_OK); 304 VERIFY(nvlist_add_uint8(resource, FM_VERSION, FM_RSRC_VERSION) == 0); 305 VERIFY(nvlist_add_string(resource, FM_CLASS, class) == 0); 306 VERIFY(nvlist_add_uint64(resource, 307 FM_EREPORT_PAYLOAD_ZFS_POOL_GUID, spa_guid(spa)) == 0); 308 if (vd) 309 VERIFY(nvlist_add_uint64(resource, 310 FM_EREPORT_PAYLOAD_ZFS_VDEV_GUID, vd->vdev_guid) == 0); 311 312 fm_ereport_post(resource, EVCH_SLEEP); 313 314 fm_nvlist_destroy(resource, FM_NVA_FREE); 315 #endif 316 } 317