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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include <sys/zfs_context.h> 30 #include <sys/spa.h> 31 #include <sys/vdev_disk.h> 32 #include <sys/vdev_impl.h> 33 #include <sys/fs/zfs.h> 34 #include <sys/zio.h> 35 #include <sys/sunldi.h> 36 37 /* 38 * Virtual device vector for disks. 39 */ 40 41 extern ldi_ident_t zfs_li; 42 43 typedef struct vdev_disk_buf { 44 buf_t vdb_buf; 45 zio_t *vdb_io; 46 } vdev_disk_buf_t; 47 48 static int 49 vdev_disk_open(vdev_t *vd, uint64_t *psize, uint64_t *ashift) 50 { 51 vdev_disk_t *dvd; 52 int error; 53 54 /* 55 * We must have a pathname, and it must be absolute. 56 */ 57 if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') { 58 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL; 59 return (EINVAL); 60 } 61 62 dvd = vd->vdev_tsd = kmem_zalloc(sizeof (vdev_disk_t), KM_SLEEP); 63 64 /* 65 * When opening a disk device, we want to preserve the user's original 66 * intent. We always want to open the device by the path the user gave 67 * us, even if it is one of multiple paths to the save device. But we 68 * also want to be able to survive disks being removed/recabled. 69 * Therefore the sequence of opening devices is: 70 * 71 * 1. Try opening the device by path. For legacy pools without the 72 * 'whole_disk' property, attempt to fix the path by appending 's0'. 73 * 74 * 2. If the devid of the device matches the stored value, return 75 * success. 76 * 77 * 3. Otherwise, the device may have moved. Try opening the device 78 * by the devid instead. 79 * 80 */ 81 if (vd->vdev_devid != NULL) { 82 if (ddi_devid_str_decode(vd->vdev_devid, &dvd->vd_devid, 83 &dvd->vd_minor) != 0) { 84 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL; 85 return (EINVAL); 86 } 87 } 88 89 error = EINVAL; /* presume failure */ 90 91 if (vd->vdev_path != NULL) { 92 ddi_devid_t devid; 93 94 if (vd->vdev_wholedisk == -1ULL) { 95 size_t len = strlen(vd->vdev_path) + 3; 96 char *buf = kmem_alloc(len, KM_SLEEP); 97 ldi_handle_t lh; 98 99 (void) snprintf(buf, len, "%ss0", vd->vdev_path); 100 101 if (ldi_open_by_name(buf, spa_mode, kcred, 102 &lh, zfs_li) == 0) { 103 spa_strfree(vd->vdev_path); 104 vd->vdev_path = buf; 105 vd->vdev_wholedisk = 1ULL; 106 (void) ldi_close(lh, spa_mode, kcred); 107 } else { 108 kmem_free(buf, len); 109 } 110 } 111 112 error = ldi_open_by_name(vd->vdev_path, spa_mode, kcred, 113 &dvd->vd_lh, zfs_li); 114 115 /* 116 * Compare the devid to the stored value. 117 */ 118 if (error == 0 && vd->vdev_devid != NULL && 119 ldi_get_devid(dvd->vd_lh, &devid) == 0) { 120 if (ddi_devid_compare(devid, dvd->vd_devid) != 0) { 121 error = EINVAL; 122 (void) ldi_close(dvd->vd_lh, spa_mode, kcred); 123 dvd->vd_lh = NULL; 124 } 125 ddi_devid_free(devid); 126 } 127 128 /* 129 * If we succeeded in opening the device, but 'vdev_wholedisk' 130 * is not yet set, then this must be a slice. 131 */ 132 if (error == 0 && vd->vdev_wholedisk == -1ULL) 133 vd->vdev_wholedisk = 0; 134 } 135 136 /* 137 * If we were unable to open by path, or the devid check fails, open by 138 * devid instead. 139 */ 140 if (error != 0 && vd->vdev_devid != NULL) 141 error = ldi_open_by_devid(dvd->vd_devid, dvd->vd_minor, 142 spa_mode, kcred, &dvd->vd_lh, zfs_li); 143 144 if (error) { 145 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; 146 return (error); 147 } 148 149 /* 150 * Determine the actual size of the device. 151 */ 152 if (ldi_get_size(dvd->vd_lh, psize) != 0) { 153 vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED; 154 return (EINVAL); 155 } 156 157 *ashift = SPA_MINBLOCKSHIFT; 158 159 return (0); 160 } 161 162 static void 163 vdev_disk_close(vdev_t *vd) 164 { 165 vdev_disk_t *dvd = vd->vdev_tsd; 166 167 if (dvd == NULL) 168 return; 169 170 dprintf("removing disk %s, devid %s\n", 171 vd->vdev_path ? vd->vdev_path : "<none>", 172 vd->vdev_devid ? vd->vdev_devid : "<none>"); 173 174 if (dvd->vd_minor != NULL) 175 ddi_devid_str_free(dvd->vd_minor); 176 177 if (dvd->vd_devid != NULL) 178 ddi_devid_free(dvd->vd_devid); 179 180 if (dvd->vd_lh != NULL) 181 (void) ldi_close(dvd->vd_lh, spa_mode, kcred); 182 183 kmem_free(dvd, sizeof (vdev_disk_t)); 184 vd->vdev_tsd = NULL; 185 } 186 187 static void 188 vdev_disk_io_intr(buf_t *bp) 189 { 190 vdev_disk_buf_t *vdb = (vdev_disk_buf_t *)bp; 191 zio_t *zio = vdb->vdb_io; 192 193 if ((zio->io_error = geterror(bp)) == 0 && bp->b_resid != 0) 194 zio->io_error = EIO; 195 196 kmem_free(vdb, sizeof (vdev_disk_buf_t)); 197 198 zio_next_stage_async(zio); 199 } 200 201 static void 202 vdev_disk_ioctl_done(void *zio_arg, int error) 203 { 204 zio_t *zio = zio_arg; 205 206 zio->io_error = error; 207 208 zio_next_stage_async(zio); 209 } 210 211 static void 212 vdev_disk_io_start(zio_t *zio) 213 { 214 vdev_t *vd = zio->io_vd; 215 vdev_disk_t *dvd = vd->vdev_tsd; 216 vdev_disk_buf_t *vdb; 217 buf_t *bp; 218 int flags, error; 219 220 if (zio->io_type == ZIO_TYPE_IOCTL) { 221 zio_vdev_io_bypass(zio); 222 223 /* XXPOLICY */ 224 if (vdev_is_dead(vd)) { 225 zio->io_error = ENXIO; 226 zio_next_stage_async(zio); 227 return; 228 } 229 230 switch (zio->io_cmd) { 231 232 case DKIOCFLUSHWRITECACHE: 233 234 zio->io_dk_callback.dkc_callback = vdev_disk_ioctl_done; 235 zio->io_dk_callback.dkc_cookie = zio; 236 237 error = ldi_ioctl(dvd->vd_lh, zio->io_cmd, 238 (uintptr_t)&zio->io_dk_callback, 239 FKIOCTL, kcred, NULL); 240 241 if (error == 0) { 242 /* 243 * The ioctl will be done asychronously, 244 * and will call vdev_disk_ioctl_done() 245 * upon completion. 246 */ 247 return; 248 } 249 zio->io_error = error; 250 break; 251 252 default: 253 zio->io_error = ENOTSUP; 254 } 255 256 zio_next_stage_async(zio); 257 return; 258 } 259 260 if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio) == 0) 261 return; 262 263 if ((zio = vdev_queue_io(zio)) == NULL) 264 return; 265 266 flags = (zio->io_type == ZIO_TYPE_READ ? B_READ : B_WRITE); 267 flags |= B_BUSY | B_NOCACHE; 268 if (zio->io_flags & ZIO_FLAG_FAILFAST) 269 flags |= B_FAILFAST; 270 271 vdb = kmem_alloc(sizeof (vdev_disk_buf_t), KM_SLEEP); 272 273 vdb->vdb_io = zio; 274 bp = &vdb->vdb_buf; 275 276 bioinit(bp); 277 bp->b_flags = flags; 278 bp->b_bcount = zio->io_size; 279 bp->b_un.b_addr = zio->io_data; 280 bp->b_lblkno = lbtodb(zio->io_offset); 281 bp->b_bufsize = zio->io_size; 282 bp->b_iodone = (int (*)())vdev_disk_io_intr; 283 284 /* XXPOLICY */ 285 error = vdev_is_dead(vd) ? ENXIO : vdev_error_inject(vd, zio); 286 if (error) { 287 zio->io_error = error; 288 bioerror(bp, error); 289 bp->b_resid = bp->b_bcount; 290 bp->b_iodone(bp); 291 return; 292 } 293 294 error = ldi_strategy(dvd->vd_lh, bp); 295 /* ldi_strategy() will return non-zero only on programming errors */ 296 ASSERT(error == 0); 297 } 298 299 static void 300 vdev_disk_io_done(zio_t *zio) 301 { 302 vdev_queue_io_done(zio); 303 304 if (zio->io_type == ZIO_TYPE_WRITE) 305 vdev_cache_write(zio); 306 307 zio_next_stage(zio); 308 } 309 310 vdev_ops_t vdev_disk_ops = { 311 vdev_disk_open, 312 vdev_disk_close, 313 vdev_default_asize, 314 vdev_disk_io_start, 315 vdev_disk_io_done, 316 NULL, 317 VDEV_TYPE_DISK, /* name of this vdev type */ 318 B_TRUE /* leaf vdev */ 319 }; 320