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/zfs_context.h> 29 #include <sys/spa.h> 30 #include <sys/vdev_disk.h> 31 #include <sys/vdev_impl.h> 32 #include <sys/fs/zfs.h> 33 #include <sys/zio.h> 34 #include <sys/sunldi.h> 35 36 /* 37 * Virtual device vector for disks. 38 */ 39 40 extern ldi_ident_t zfs_li; 41 42 typedef struct vdev_disk_buf { 43 buf_t vdb_buf; 44 zio_t *vdb_io; 45 } vdev_disk_buf_t; 46 47 static int 48 vdev_disk_open(vdev_t *vd, uint64_t *psize, uint64_t *ashift) 49 { 50 vdev_disk_t *dvd; 51 int error; 52 53 /* 54 * We must have a pathname, and it must be absolute. 55 */ 56 if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') { 57 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL; 58 return (EINVAL); 59 } 60 61 dvd = vd->vdev_tsd = kmem_zalloc(sizeof (vdev_disk_t), KM_SLEEP); 62 63 /* 64 * When opening a disk device, we want to preserve the user's original 65 * intent. We always want to open the device by the path the user gave 66 * us, even if it is one of multiple paths to the save device. But we 67 * also want to be able to survive disks being removed/recabled. 68 * Therefore the sequence of opening devices is: 69 * 70 * 1. Try opening the device by path. For legacy pools without the 71 * 'whole_disk' property, attempt to fix the path by appending 's0'. 72 * 73 * 2. If the devid of the device matches the stored value, return 74 * success. 75 * 76 * 3. Otherwise, the device may have moved. Try opening the device 77 * by the devid instead. 78 * 79 */ 80 if (vd->vdev_devid != NULL) { 81 if (ddi_devid_str_decode(vd->vdev_devid, &dvd->vd_devid, 82 &dvd->vd_minor) != 0) { 83 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL; 84 return (EINVAL); 85 } 86 } 87 88 error = EINVAL; /* presume failure */ 89 90 if (vd->vdev_path != NULL) { 91 ddi_devid_t devid; 92 93 if (vd->vdev_wholedisk == -1ULL) { 94 size_t len = strlen(vd->vdev_path) + 3; 95 char *buf = kmem_alloc(len, KM_SLEEP); 96 ldi_handle_t lh; 97 98 (void) snprintf(buf, len, "%ss0", vd->vdev_path); 99 100 if (ldi_open_by_name(buf, spa_mode, kcred, 101 &lh, zfs_li) == 0) { 102 spa_strfree(vd->vdev_path); 103 vd->vdev_path = buf; 104 vd->vdev_wholedisk = 1ULL; 105 (void) ldi_close(lh, spa_mode, kcred); 106 } else { 107 kmem_free(buf, len); 108 } 109 } 110 111 error = ldi_open_by_name(vd->vdev_path, spa_mode, kcred, 112 &dvd->vd_lh, zfs_li); 113 114 /* 115 * Compare the devid to the stored value. 116 */ 117 if (error == 0 && vd->vdev_devid != NULL && 118 ldi_get_devid(dvd->vd_lh, &devid) == 0) { 119 if (ddi_devid_compare(devid, dvd->vd_devid) != 0) { 120 error = EINVAL; 121 (void) ldi_close(dvd->vd_lh, spa_mode, kcred); 122 dvd->vd_lh = NULL; 123 } 124 ddi_devid_free(devid); 125 } 126 127 /* 128 * If we succeeded in opening the device, but 'vdev_wholedisk' 129 * is not yet set, then this must be a slice. 130 */ 131 if (error == 0 && vd->vdev_wholedisk == -1ULL) 132 vd->vdev_wholedisk = 0; 133 } 134 135 /* 136 * If we were unable to open by path, or the devid check fails, open by 137 * devid instead. 138 */ 139 if (error != 0 && vd->vdev_devid != NULL) 140 error = ldi_open_by_devid(dvd->vd_devid, dvd->vd_minor, 141 spa_mode, kcred, &dvd->vd_lh, zfs_li); 142 143 if (error) { 144 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; 145 return (error); 146 } 147 148 /* 149 * Determine the actual size of the device. 150 */ 151 if (ldi_get_size(dvd->vd_lh, psize) != 0) { 152 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; 153 return (EINVAL); 154 } 155 156 *ashift = SPA_MINBLOCKSHIFT; 157 158 159 if (vd->vdev_wholedisk == 1) { 160 161 int wce, rc; 162 163 /* 164 * Enable disk write caching if we own the whole disk. 165 * Ignore errors as this is a performance optimization, 166 * we work just fine w/o it. 167 */ 168 error = 0; 169 wce = 1; 170 rc = ldi_ioctl(dvd->vd_lh, DKIOCSETWCE, (intptr_t)&wce, 171 FKIOCTL, kcred, &error); 172 173 if (rc || error) 174 dprintf("%s: DKIOCSETWCE failed %d,%d", 175 vdev_description(vd), rc, error); 176 } 177 178 return (0); 179 } 180 181 static void 182 vdev_disk_close(vdev_t *vd) 183 { 184 vdev_disk_t *dvd = vd->vdev_tsd; 185 186 if (dvd == NULL) 187 return; 188 189 dprintf("removing disk %s, devid %s\n", 190 vd->vdev_path ? vd->vdev_path : "<none>", 191 vd->vdev_devid ? vd->vdev_devid : "<none>"); 192 193 if (dvd->vd_minor != NULL) 194 ddi_devid_str_free(dvd->vd_minor); 195 196 if (dvd->vd_devid != NULL) 197 ddi_devid_free(dvd->vd_devid); 198 199 if (dvd->vd_lh != NULL) 200 (void) ldi_close(dvd->vd_lh, spa_mode, kcred); 201 202 kmem_free(dvd, sizeof (vdev_disk_t)); 203 vd->vdev_tsd = NULL; 204 } 205 206 static void 207 vdev_disk_io_intr(buf_t *bp) 208 { 209 vdev_disk_buf_t *vdb = (vdev_disk_buf_t *)bp; 210 zio_t *zio = vdb->vdb_io; 211 212 if ((zio->io_error = geterror(bp)) == 0 && bp->b_resid != 0) 213 zio->io_error = EIO; 214 215 kmem_free(vdb, sizeof (vdev_disk_buf_t)); 216 217 zio_next_stage_async(zio); 218 } 219 220 static void 221 vdev_disk_ioctl_done(void *zio_arg, int error) 222 { 223 zio_t *zio = zio_arg; 224 225 zio->io_error = error; 226 227 zio_next_stage_async(zio); 228 } 229 230 static void 231 vdev_disk_io_start(zio_t *zio) 232 { 233 vdev_t *vd = zio->io_vd; 234 vdev_disk_t *dvd = vd->vdev_tsd; 235 vdev_disk_buf_t *vdb; 236 buf_t *bp; 237 int flags, error; 238 239 if (zio->io_type == ZIO_TYPE_IOCTL) { 240 zio_vdev_io_bypass(zio); 241 242 /* XXPOLICY */ 243 if (vdev_is_dead(vd)) { 244 zio->io_error = ENXIO; 245 zio_next_stage_async(zio); 246 return; 247 } 248 249 switch (zio->io_cmd) { 250 251 case DKIOCFLUSHWRITECACHE: 252 253 zio->io_dk_callback.dkc_callback = vdev_disk_ioctl_done; 254 zio->io_dk_callback.dkc_cookie = zio; 255 256 error = ldi_ioctl(dvd->vd_lh, zio->io_cmd, 257 (uintptr_t)&zio->io_dk_callback, 258 FKIOCTL, kcred, NULL); 259 260 if (error == 0) { 261 /* 262 * The ioctl will be done asychronously, 263 * and will call vdev_disk_ioctl_done() 264 * upon completion. 265 */ 266 return; 267 } 268 zio->io_error = error; 269 break; 270 271 default: 272 zio->io_error = ENOTSUP; 273 } 274 275 zio_next_stage_async(zio); 276 return; 277 } 278 279 if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio) == 0) 280 return; 281 282 if ((zio = vdev_queue_io(zio)) == NULL) 283 return; 284 285 flags = (zio->io_type == ZIO_TYPE_READ ? B_READ : B_WRITE); 286 flags |= B_BUSY | B_NOCACHE; 287 if (zio->io_flags & ZIO_FLAG_FAILFAST) 288 flags |= B_FAILFAST; 289 290 vdb = kmem_alloc(sizeof (vdev_disk_buf_t), KM_SLEEP); 291 292 vdb->vdb_io = zio; 293 bp = &vdb->vdb_buf; 294 295 bioinit(bp); 296 bp->b_flags = flags; 297 bp->b_bcount = zio->io_size; 298 bp->b_un.b_addr = zio->io_data; 299 bp->b_lblkno = lbtodb(zio->io_offset); 300 bp->b_bufsize = zio->io_size; 301 bp->b_iodone = (int (*)())vdev_disk_io_intr; 302 303 /* XXPOLICY */ 304 error = vdev_is_dead(vd) ? ENXIO : vdev_error_inject(vd, zio); 305 if (error) { 306 zio->io_error = error; 307 bioerror(bp, error); 308 bp->b_resid = bp->b_bcount; 309 bp->b_iodone(bp); 310 return; 311 } 312 313 error = ldi_strategy(dvd->vd_lh, bp); 314 /* ldi_strategy() will return non-zero only on programming errors */ 315 ASSERT(error == 0); 316 } 317 318 static void 319 vdev_disk_io_done(zio_t *zio) 320 { 321 vdev_queue_io_done(zio); 322 323 if (zio->io_type == ZIO_TYPE_WRITE) 324 vdev_cache_write(zio); 325 326 if (zio_injection_enabled && zio->io_error == 0) 327 zio->io_error = zio_handle_device_injection(zio->io_vd, EIO); 328 329 zio_next_stage(zio); 330 } 331 332 vdev_ops_t vdev_disk_ops = { 333 vdev_disk_open, 334 vdev_disk_close, 335 vdev_default_asize, 336 vdev_disk_io_start, 337 vdev_disk_io_done, 338 NULL, 339 VDEV_TYPE_DISK, /* name of this vdev type */ 340 B_TRUE /* leaf vdev */ 341 }; 342