| File: | scsi/mpath.c |
| Warning: | line 306, column 4 Value stored to 'p' is never read |
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| 1 | /* $OpenBSD: mpath.c,v 1.57 2022/07/02 08:50:42 visa Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 2009 David Gwynne <dlg@openbsd.org> |
| 5 | * |
| 6 | * Permission to use, copy, modify, and distribute this software for any |
| 7 | * purpose with or without fee is hereby granted, provided that the above |
| 8 | * copyright notice and this permission notice appear in all copies. |
| 9 | * |
| 10 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| 11 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| 12 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
| 13 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 14 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| 15 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| 16 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 17 | */ |
| 18 | |
| 19 | #include <sys/param.h> |
| 20 | #include <sys/systm.h> |
| 21 | #include <sys/kernel.h> |
| 22 | #include <sys/malloc.h> |
| 23 | #include <sys/device.h> |
| 24 | #include <sys/conf.h> |
| 25 | #include <sys/queue.h> |
| 26 | #include <sys/rwlock.h> |
| 27 | #include <sys/ioctl.h> |
| 28 | |
| 29 | #include <scsi/scsi_all.h> |
| 30 | #include <scsi/scsiconf.h> |
| 31 | #include <scsi/mpathvar.h> |
| 32 | |
| 33 | #define MPATH_BUSWIDTH256 256 |
| 34 | |
| 35 | int mpath_match(struct device *, void *, void *); |
| 36 | void mpath_attach(struct device *, struct device *, void *); |
| 37 | void mpath_shutdown(void *); |
| 38 | |
| 39 | TAILQ_HEAD(mpath_paths, mpath_path)struct mpath_paths { struct mpath_path *tqh_first; struct mpath_path **tqh_last; }; |
| 40 | |
| 41 | struct mpath_group { |
| 42 | TAILQ_ENTRY(mpath_group)struct { struct mpath_group *tqe_next; struct mpath_group **tqe_prev ; } g_entry; |
| 43 | struct mpath_paths g_paths; |
| 44 | struct mpath_dev *g_dev; |
| 45 | u_int g_id; |
| 46 | }; |
| 47 | TAILQ_HEAD(mpath_groups, mpath_group)struct mpath_groups { struct mpath_group *tqh_first; struct mpath_group **tqh_last; }; |
| 48 | |
| 49 | struct mpath_dev { |
| 50 | struct mutex d_mtx; |
| 51 | |
| 52 | struct scsi_xfer_list d_xfers; |
| 53 | struct mpath_path *d_next_path; |
| 54 | |
| 55 | struct mpath_groups d_groups; |
| 56 | |
| 57 | struct mpath_group *d_failover_iter; |
| 58 | struct timeout d_failover_tmo; |
| 59 | u_int d_failover; |
| 60 | |
| 61 | const struct mpath_ops *d_ops; |
| 62 | struct devid *d_id; |
| 63 | }; |
| 64 | |
| 65 | struct mpath_softc { |
| 66 | struct device sc_dev; |
| 67 | struct scsibus_softc *sc_scsibus; |
| 68 | struct mpath_dev *sc_devs[MPATH_BUSWIDTH256]; |
| 69 | }; |
| 70 | #define DEVNAME(_s)((_s)->sc_dev.dv_xname) ((_s)->sc_dev.dv_xname) |
| 71 | |
| 72 | struct mpath_softc *mpath; |
| 73 | |
| 74 | const struct cfattach mpath_ca = { |
| 75 | sizeof(struct mpath_softc), |
| 76 | mpath_match, |
| 77 | mpath_attach |
| 78 | }; |
| 79 | |
| 80 | struct cfdriver mpath_cd = { |
| 81 | NULL((void *)0), |
| 82 | "mpath", |
| 83 | DV_DULL |
| 84 | }; |
| 85 | |
| 86 | void mpath_cmd(struct scsi_xfer *); |
| 87 | void mpath_minphys(struct buf *, struct scsi_link *); |
| 88 | int mpath_probe(struct scsi_link *); |
| 89 | |
| 90 | struct mpath_path *mpath_next_path(struct mpath_dev *); |
| 91 | void mpath_done(struct scsi_xfer *); |
| 92 | |
| 93 | void mpath_failover(struct mpath_dev *); |
| 94 | void mpath_failover_start(void *); |
| 95 | void mpath_failover_check(struct mpath_dev *); |
| 96 | |
| 97 | const struct scsi_adapter mpath_switch = { |
| 98 | mpath_cmd, NULL((void *)0), mpath_probe, NULL((void *)0), NULL((void *)0) |
| 99 | }; |
| 100 | |
| 101 | void mpath_xs_stuffup(struct scsi_xfer *); |
| 102 | |
| 103 | int |
| 104 | mpath_match(struct device *parent, void *match, void *aux) |
| 105 | { |
| 106 | return (1); |
| 107 | } |
| 108 | |
| 109 | void |
| 110 | mpath_attach(struct device *parent, struct device *self, void *aux) |
| 111 | { |
| 112 | struct mpath_softc *sc = (struct mpath_softc *)self; |
| 113 | struct scsibus_attach_args saa; |
| 114 | |
| 115 | mpath = sc; |
| 116 | |
| 117 | printf("\n"); |
| 118 | |
| 119 | saa.saa_adapter = &mpath_switch; |
| 120 | saa.saa_adapter_softc = sc; |
| 121 | saa.saa_adapter_target = SDEV_NO_ADAPTER_TARGET0xffff; |
| 122 | saa.saa_adapter_buswidth = MPATH_BUSWIDTH256; |
| 123 | saa.saa_luns = 1; |
| 124 | saa.saa_openings = 1024; /* XXX magical */ |
| 125 | saa.saa_pool = NULL((void *)0); |
| 126 | saa.saa_quirks = saa.saa_flags = 0; |
| 127 | saa.saa_wwpn = saa.saa_wwnn = 0; |
| 128 | |
| 129 | sc->sc_scsibus = (struct scsibus_softc *)config_found(&sc->sc_dev,config_found_sm((&sc->sc_dev), (&saa), (scsiprint) , ((void *)0)) |
| 130 | &saa, scsiprint)config_found_sm((&sc->sc_dev), (&saa), (scsiprint) , ((void *)0)); |
| 131 | } |
| 132 | |
| 133 | void |
| 134 | mpath_xs_stuffup(struct scsi_xfer *xs) |
| 135 | { |
| 136 | xs->error = XS_DRIVER_STUFFUP2; |
| 137 | scsi_done(xs); |
| 138 | } |
| 139 | |
| 140 | int |
| 141 | mpath_probe(struct scsi_link *link) |
| 142 | { |
| 143 | struct mpath_softc *sc = link->bus->sb_adapter_softc; |
| 144 | struct mpath_dev *d = sc->sc_devs[link->target]; |
| 145 | |
| 146 | if (link->lun != 0 || d == NULL((void *)0)) |
| 147 | return (ENXIO6); |
| 148 | |
| 149 | link->id = devid_copy(d->d_id); |
| 150 | |
| 151 | return (0); |
| 152 | } |
| 153 | |
| 154 | struct mpath_path * |
| 155 | mpath_next_path(struct mpath_dev *d) |
| 156 | { |
| 157 | struct mpath_group *g; |
| 158 | struct mpath_path *p; |
| 159 | |
| 160 | #ifdef DIAGNOSTIC1 |
| 161 | if (d == NULL((void *)0)) |
| 162 | panic("%s: d is NULL", __func__); |
| 163 | #endif /* DIAGNOSTIC */ |
| 164 | |
| 165 | p = d->d_next_path; |
| 166 | if (p != NULL((void *)0)) { |
| 167 | d->d_next_path = TAILQ_NEXT(p, p_entry)((p)->p_entry.tqe_next); |
| 168 | if (d->d_next_path == NULL((void *)0) && |
| 169 | (g = TAILQ_FIRST(&d->d_groups)((&d->d_groups)->tqh_first)) != NULL((void *)0)) |
| 170 | d->d_next_path = TAILQ_FIRST(&g->g_paths)((&g->g_paths)->tqh_first); |
| 171 | } |
| 172 | |
| 173 | return (p); |
| 174 | } |
| 175 | |
| 176 | void |
| 177 | mpath_cmd(struct scsi_xfer *xs) |
| 178 | { |
| 179 | struct scsi_link *link = xs->sc_link; |
| 180 | struct mpath_softc *sc = link->bus->sb_adapter_softc; |
| 181 | struct mpath_dev *d = sc->sc_devs[link->target]; |
| 182 | struct mpath_path *p; |
| 183 | struct scsi_xfer *mxs; |
| 184 | |
| 185 | #ifdef DIAGNOSTIC1 |
| 186 | if (d == NULL((void *)0)) |
| 187 | panic("mpath_cmd issued against nonexistent device"); |
| 188 | #endif /* DIAGNOSTIC */ |
| 189 | |
| 190 | if (ISSET(xs->flags, SCSI_POLL)((xs->flags) & (0x00002))) { |
| 191 | mtx_enter(&d->d_mtx); |
| 192 | p = mpath_next_path(d); |
| 193 | mtx_leave(&d->d_mtx); |
| 194 | if (p == NULL((void *)0)) { |
| 195 | mpath_xs_stuffup(xs); |
| 196 | return; |
| 197 | } |
| 198 | |
| 199 | mxs = scsi_xs_get(p->p_link, xs->flags); |
| 200 | if (mxs == NULL((void *)0)) { |
| 201 | mpath_xs_stuffup(xs); |
| 202 | return; |
| 203 | } |
| 204 | |
| 205 | memcpy(&mxs->cmd, &xs->cmd, xs->cmdlen)__builtin_memcpy((&mxs->cmd), (&xs->cmd), (xs-> cmdlen)); |
| 206 | mxs->cmdlen = xs->cmdlen; |
| 207 | mxs->data = xs->data; |
| 208 | mxs->datalen = xs->datalen; |
| 209 | mxs->retries = xs->retries; |
| 210 | mxs->timeout = xs->timeout; |
| 211 | mxs->bp = xs->bp; |
| 212 | |
| 213 | scsi_xs_sync(mxs); |
| 214 | |
| 215 | xs->error = mxs->error; |
| 216 | xs->status = mxs->status; |
| 217 | xs->resid = mxs->resid; |
| 218 | |
| 219 | memcpy(&xs->sense, &mxs->sense, sizeof(xs->sense))__builtin_memcpy((&xs->sense), (&mxs->sense), ( sizeof(xs->sense))); |
| 220 | |
| 221 | scsi_xs_put(mxs); |
| 222 | scsi_done(xs); |
| 223 | return; |
| 224 | } |
| 225 | |
| 226 | mtx_enter(&d->d_mtx); |
| 227 | SIMPLEQ_INSERT_TAIL(&d->d_xfers, xs, xfer_list)do { (xs)->xfer_list.sqe_next = ((void *)0); *(&d-> d_xfers)->sqh_last = (xs); (&d->d_xfers)->sqh_last = &(xs)->xfer_list.sqe_next; } while (0); |
| 228 | p = mpath_next_path(d); |
| 229 | mtx_leave(&d->d_mtx); |
| 230 | |
| 231 | if (p != NULL((void *)0)) |
| 232 | scsi_xsh_add(&p->p_xsh); |
| 233 | } |
| 234 | |
| 235 | void |
| 236 | mpath_start(struct mpath_path *p, struct scsi_xfer *mxs) |
| 237 | { |
| 238 | struct mpath_dev *d = p->p_group->g_dev; |
| 239 | struct scsi_xfer *xs; |
| 240 | int addxsh = 0; |
| 241 | |
| 242 | if (ISSET(p->p_link->state, SDEV_S_DYING)((p->p_link->state) & ((1<<1))) || d == NULL((void *)0)) |
| 243 | goto fail; |
| 244 | |
| 245 | mtx_enter(&d->d_mtx); |
| 246 | xs = SIMPLEQ_FIRST(&d->d_xfers)((&d->d_xfers)->sqh_first); |
| 247 | if (xs != NULL((void *)0)) { |
| 248 | SIMPLEQ_REMOVE_HEAD(&d->d_xfers, xfer_list)do { if (((&d->d_xfers)->sqh_first = (&d->d_xfers )->sqh_first->xfer_list.sqe_next) == ((void *)0)) (& d->d_xfers)->sqh_last = &(&d->d_xfers)->sqh_first ; } while (0); |
| 249 | if (!SIMPLEQ_EMPTY(&d->d_xfers)(((&d->d_xfers)->sqh_first) == ((void *)0))) |
| 250 | addxsh = 1; |
| 251 | } |
| 252 | mtx_leave(&d->d_mtx); |
| 253 | |
| 254 | if (xs == NULL((void *)0)) |
| 255 | goto fail; |
| 256 | |
| 257 | memcpy(&mxs->cmd, &xs->cmd, xs->cmdlen)__builtin_memcpy((&mxs->cmd), (&xs->cmd), (xs-> cmdlen)); |
| 258 | mxs->cmdlen = xs->cmdlen; |
| 259 | mxs->data = xs->data; |
| 260 | mxs->datalen = xs->datalen; |
| 261 | mxs->retries = xs->retries; |
| 262 | mxs->timeout = xs->timeout; |
| 263 | mxs->bp = xs->bp; |
| 264 | mxs->flags = xs->flags; |
| 265 | |
| 266 | mxs->cookie = xs; |
| 267 | mxs->done = mpath_done; |
| 268 | |
| 269 | scsi_xs_exec(mxs); |
| 270 | |
| 271 | if (addxsh) |
| 272 | scsi_xsh_add(&p->p_xsh); |
| 273 | |
| 274 | return; |
| 275 | fail: |
| 276 | scsi_xs_put(mxs); |
| 277 | } |
| 278 | |
| 279 | void |
| 280 | mpath_done(struct scsi_xfer *mxs) |
| 281 | { |
| 282 | struct scsi_xfer *xs = mxs->cookie; |
| 283 | struct scsi_link *link = xs->sc_link; |
| 284 | struct mpath_softc *sc = link->bus->sb_adapter_softc; |
| 285 | struct mpath_dev *d = sc->sc_devs[link->target]; |
| 286 | struct mpath_path *p; |
| 287 | |
| 288 | switch (mxs->error) { |
| 289 | case XS_SELTIMEOUT3: /* physical path is gone, try the next */ |
| 290 | case XS_RESET8: |
| 291 | mtx_enter(&d->d_mtx); |
| 292 | SIMPLEQ_INSERT_HEAD(&d->d_xfers, xs, xfer_list)do { if (((xs)->xfer_list.sqe_next = (&d->d_xfers)-> sqh_first) == ((void *)0)) (&d->d_xfers)->sqh_last = &(xs)->xfer_list.sqe_next; (&d->d_xfers)->sqh_first = (xs); } while (0); |
| 293 | p = mpath_next_path(d); |
| 294 | mtx_leave(&d->d_mtx); |
| 295 | |
| 296 | scsi_xs_put(mxs); |
| 297 | |
| 298 | if (p != NULL((void *)0)) |
| 299 | scsi_xsh_add(&p->p_xsh); |
| 300 | return; |
| 301 | case XS_SENSE1: |
| 302 | switch (d->d_ops->op_checksense(mxs)) { |
| 303 | case MPATH_SENSE_FAILOVER1: |
| 304 | mtx_enter(&d->d_mtx); |
| 305 | SIMPLEQ_INSERT_HEAD(&d->d_xfers, xs, xfer_list)do { if (((xs)->xfer_list.sqe_next = (&d->d_xfers)-> sqh_first) == ((void *)0)) (&d->d_xfers)->sqh_last = &(xs)->xfer_list.sqe_next; (&d->d_xfers)->sqh_first = (xs); } while (0); |
| 306 | p = mpath_next_path(d); |
Value stored to 'p' is never read | |
| 307 | mtx_leave(&d->d_mtx); |
| 308 | |
| 309 | scsi_xs_put(mxs); |
| 310 | |
| 311 | mpath_failover(d); |
| 312 | return; |
| 313 | case MPATH_SENSE_DECLINED0: |
| 314 | break; |
| 315 | #ifdef DIAGNOSTIC1 |
| 316 | default: |
| 317 | panic("unexpected return from checksense"); |
| 318 | #endif /* DIAGNOSTIC */ |
| 319 | } |
| 320 | break; |
| 321 | } |
| 322 | |
| 323 | xs->error = mxs->error; |
| 324 | xs->status = mxs->status; |
| 325 | xs->resid = mxs->resid; |
| 326 | |
| 327 | memcpy(&xs->sense, &mxs->sense, sizeof(xs->sense))__builtin_memcpy((&xs->sense), (&mxs->sense), ( sizeof(xs->sense))); |
| 328 | |
| 329 | scsi_xs_put(mxs); |
| 330 | |
| 331 | scsi_done(xs); |
| 332 | } |
| 333 | |
| 334 | void |
| 335 | mpath_failover(struct mpath_dev *d) |
| 336 | { |
| 337 | if (!scsi_pending_start(&d->d_mtx, &d->d_failover)) |
| 338 | return; |
| 339 | |
| 340 | mpath_failover_start(d); |
| 341 | } |
| 342 | |
| 343 | void |
| 344 | mpath_failover_start(void *xd) |
| 345 | { |
| 346 | struct mpath_dev *d = xd; |
| 347 | |
| 348 | mtx_enter(&d->d_mtx); |
| 349 | d->d_failover_iter = TAILQ_FIRST(&d->d_groups)((&d->d_groups)->tqh_first); |
| 350 | mtx_leave(&d->d_mtx); |
| 351 | |
| 352 | mpath_failover_check(d); |
| 353 | } |
| 354 | |
| 355 | void |
| 356 | mpath_failover_check(struct mpath_dev *d) |
| 357 | { |
| 358 | struct mpath_group *g = d->d_failover_iter; |
| 359 | struct mpath_path *p; |
| 360 | |
| 361 | if (g == NULL((void *)0)) |
| 362 | timeout_add_sec(&d->d_failover_tmo, 1); |
| 363 | else { |
| 364 | p = TAILQ_FIRST(&g->g_paths)((&g->g_paths)->tqh_first); |
| 365 | d->d_ops->op_status(p->p_link); |
| 366 | } |
| 367 | } |
| 368 | |
| 369 | void |
| 370 | mpath_path_status(struct mpath_path *p, int status) |
| 371 | { |
| 372 | struct mpath_group *g = p->p_group; |
| 373 | struct mpath_dev *d = g->g_dev; |
| 374 | |
| 375 | mtx_enter(&d->d_mtx); |
| 376 | if (status == MPATH_S_ACTIVE0) { |
| 377 | TAILQ_REMOVE(&d->d_groups, g, g_entry)do { if (((g)->g_entry.tqe_next) != ((void *)0)) (g)->g_entry .tqe_next->g_entry.tqe_prev = (g)->g_entry.tqe_prev; else (&d->d_groups)->tqh_last = (g)->g_entry.tqe_prev ; *(g)->g_entry.tqe_prev = (g)->g_entry.tqe_next; ((g)-> g_entry.tqe_prev) = ((void *)-1); ((g)->g_entry.tqe_next) = ((void *)-1); } while (0); |
| 378 | TAILQ_INSERT_HEAD(&d->d_groups, g, g_entry)do { if (((g)->g_entry.tqe_next = (&d->d_groups)-> tqh_first) != ((void *)0)) (&d->d_groups)->tqh_first ->g_entry.tqe_prev = &(g)->g_entry.tqe_next; else ( &d->d_groups)->tqh_last = &(g)->g_entry.tqe_next ; (&d->d_groups)->tqh_first = (g); (g)->g_entry. tqe_prev = &(&d->d_groups)->tqh_first; } while ( 0); |
| 379 | d->d_next_path = p; |
| 380 | } else |
| 381 | d->d_failover_iter = TAILQ_NEXT(d->d_failover_iter, g_entry)((d->d_failover_iter)->g_entry.tqe_next); |
| 382 | mtx_leave(&d->d_mtx); |
| 383 | |
| 384 | if (status == MPATH_S_ACTIVE0) { |
| 385 | scsi_xsh_add(&p->p_xsh); |
| 386 | if (!scsi_pending_finish(&d->d_mtx, &d->d_failover)) |
| 387 | mpath_failover_start(d); |
| 388 | } else |
| 389 | mpath_failover_check(d); |
| 390 | } |
| 391 | |
| 392 | void |
| 393 | mpath_minphys(struct buf *bp, struct scsi_link *link) |
| 394 | { |
| 395 | struct mpath_softc *sc = link->bus->sb_adapter_softc; |
| 396 | struct mpath_dev *d = sc->sc_devs[link->target]; |
| 397 | struct mpath_group *g; |
| 398 | struct mpath_path *p; |
| 399 | |
| 400 | #ifdef DIAGNOSTIC1 |
| 401 | if (d == NULL((void *)0)) |
| 402 | panic("mpath_minphys against nonexistent device"); |
| 403 | #endif /* DIAGNOSTIC */ |
| 404 | |
| 405 | mtx_enter(&d->d_mtx); |
| 406 | TAILQ_FOREACH(g, &d->d_groups, g_entry)for((g) = ((&d->d_groups)->tqh_first); (g) != ((void *)0); (g) = ((g)->g_entry.tqe_next)) { |
| 407 | TAILQ_FOREACH(p, &g->g_paths, p_entry)for((p) = ((&g->g_paths)->tqh_first); (p) != ((void *)0); (p) = ((p)->p_entry.tqe_next)) { |
| 408 | /* XXX crossing layers with mutex held */ |
| 409 | if (p->p_link->bus->sb_adapter->dev_minphys != NULL((void *)0)) |
| 410 | p->p_link->bus->sb_adapter->dev_minphys(bp, |
| 411 | p->p_link); |
| 412 | } |
| 413 | } |
| 414 | mtx_leave(&d->d_mtx); |
| 415 | } |
| 416 | |
| 417 | int |
| 418 | mpath_path_probe(struct scsi_link *link) |
| 419 | { |
| 420 | if (mpath == NULL((void *)0)) |
| 421 | return (ENXIO6); |
| 422 | |
| 423 | if (link->id == NULL((void *)0)) |
| 424 | return (EINVAL22); |
| 425 | |
| 426 | if (ISSET(link->flags, SDEV_UMASS)((link->flags) & (0x0400))) |
| 427 | return (EINVAL22); |
| 428 | |
| 429 | if (mpath == link->bus->sb_adapter_softc) |
| 430 | return (ENXIO6); |
| 431 | |
| 432 | return (0); |
| 433 | } |
| 434 | |
| 435 | int |
| 436 | mpath_path_attach(struct mpath_path *p, u_int g_id, const struct mpath_ops *ops) |
| 437 | { |
| 438 | struct mpath_softc *sc = mpath; |
| 439 | struct scsi_link *link = p->p_link; |
| 440 | struct mpath_dev *d = NULL((void *)0); |
| 441 | struct mpath_group *g; |
| 442 | int newdev = 0, addxsh = 0; |
| 443 | int target; |
| 444 | |
| 445 | #ifdef DIAGNOSTIC1 |
| 446 | if (p->p_link == NULL((void *)0)) |
| 447 | panic("mpath_path_attach: NULL link"); |
| 448 | if (p->p_group != NULL((void *)0)) |
| 449 | panic("mpath_path_attach: group is not NULL"); |
| 450 | #endif /* DIAGNOSTIC */ |
| 451 | |
| 452 | for (target = 0; target < MPATH_BUSWIDTH256; target++) { |
| 453 | if ((d = sc->sc_devs[target]) == NULL((void *)0)) |
| 454 | continue; |
| 455 | |
| 456 | if (DEVID_CMP(d->d_id, link->id)( (d->d_id) != ((void *)0) && (link->id) != ((void *)0) && ((d->d_id) == (link->id) || ((d->d_id )->d_type != 0 && (d->d_id)->d_type == (link ->id)->d_type && (d->d_id)->d_len == (link ->id)->d_len && bcmp((d->d_id) + 1, (link-> id) + 1, (d->d_id)->d_len) == 0)) ) && d->d_ops == ops) |
| 457 | break; |
| 458 | |
| 459 | d = NULL((void *)0); |
| 460 | } |
| 461 | |
| 462 | if (d == NULL((void *)0)) { |
| 463 | for (target = 0; target < MPATH_BUSWIDTH256; target++) { |
| 464 | if (sc->sc_devs[target] == NULL((void *)0)) |
| 465 | break; |
| 466 | } |
| 467 | if (target >= MPATH_BUSWIDTH256) |
| 468 | return (ENXIO6); |
| 469 | |
| 470 | d = malloc(sizeof(*d), M_DEVBUF2, M_WAITOK0x0001 | M_CANFAIL0x0004 | M_ZERO0x0008); |
| 471 | if (d == NULL((void *)0)) |
| 472 | return (ENOMEM12); |
| 473 | |
| 474 | mtx_init(&d->d_mtx, IPL_BIO)do { (void)(((void *)0)); (void)(0); __mtx_init((&d->d_mtx ), ((((0x3)) > 0x0 && ((0x3)) < 0x9) ? 0x9 : (( 0x3)))); } while (0); |
| 475 | TAILQ_INIT(&d->d_groups)do { (&d->d_groups)->tqh_first = ((void *)0); (& d->d_groups)->tqh_last = &(&d->d_groups)-> tqh_first; } while (0); |
| 476 | SIMPLEQ_INIT(&d->d_xfers)do { (&d->d_xfers)->sqh_first = ((void *)0); (& d->d_xfers)->sqh_last = &(&d->d_xfers)->sqh_first ; } while (0); |
| 477 | d->d_id = devid_copy(link->id); |
| 478 | d->d_ops = ops; |
| 479 | |
| 480 | timeout_set(&d->d_failover_tmo, mpath_failover_start, d); |
| 481 | |
| 482 | sc->sc_devs[target] = d; |
| 483 | newdev = 1; |
| 484 | } else { |
| 485 | /* |
| 486 | * instead of carrying identical values in different devid |
| 487 | * instances, delete the new one and reference the old one in |
| 488 | * the new scsi_link. |
| 489 | */ |
| 490 | devid_free(link->id); |
| 491 | link->id = devid_copy(d->d_id); |
| 492 | } |
| 493 | |
| 494 | TAILQ_FOREACH(g, &d->d_groups, g_entry)for((g) = ((&d->d_groups)->tqh_first); (g) != ((void *)0); (g) = ((g)->g_entry.tqe_next)) { |
| 495 | if (g->g_id == g_id) |
| 496 | break; |
| 497 | } |
| 498 | |
| 499 | if (g == NULL((void *)0)) { |
| 500 | g = malloc(sizeof(*g), M_DEVBUF2, |
| 501 | M_WAITOK0x0001 | M_CANFAIL0x0004 | M_ZERO0x0008); |
| 502 | if (g == NULL((void *)0)) { |
| 503 | if (newdev) { |
| 504 | free(d, M_DEVBUF2, sizeof(*d)); |
| 505 | sc->sc_devs[target] = NULL((void *)0); |
| 506 | } |
| 507 | |
| 508 | return (ENOMEM12); |
| 509 | } |
| 510 | |
| 511 | TAILQ_INIT(&g->g_paths)do { (&g->g_paths)->tqh_first = ((void *)0); (& g->g_paths)->tqh_last = &(&g->g_paths)->tqh_first ; } while (0); |
| 512 | g->g_dev = d; |
| 513 | g->g_id = g_id; |
| 514 | |
| 515 | mtx_enter(&d->d_mtx); |
| 516 | TAILQ_INSERT_TAIL(&d->d_groups, g, g_entry)do { (g)->g_entry.tqe_next = ((void *)0); (g)->g_entry. tqe_prev = (&d->d_groups)->tqh_last; *(&d->d_groups )->tqh_last = (g); (&d->d_groups)->tqh_last = & (g)->g_entry.tqe_next; } while (0); |
| 517 | mtx_leave(&d->d_mtx); |
| 518 | } |
| 519 | |
| 520 | p->p_group = g; |
| 521 | |
| 522 | mtx_enter(&d->d_mtx); |
| 523 | TAILQ_INSERT_TAIL(&g->g_paths, p, p_entry)do { (p)->p_entry.tqe_next = ((void *)0); (p)->p_entry. tqe_prev = (&g->g_paths)->tqh_last; *(&g->g_paths )->tqh_last = (p); (&g->g_paths)->tqh_last = & (p)->p_entry.tqe_next; } while (0); |
| 524 | if (!SIMPLEQ_EMPTY(&d->d_xfers)(((&d->d_xfers)->sqh_first) == ((void *)0))) |
| 525 | addxsh = 1; |
| 526 | |
| 527 | if (d->d_next_path == NULL((void *)0)) |
| 528 | d->d_next_path = p; |
| 529 | mtx_leave(&d->d_mtx); |
| 530 | |
| 531 | if (newdev) |
| 532 | scsi_probe_target(mpath->sc_scsibus, target); |
| 533 | else if (addxsh) |
| 534 | scsi_xsh_add(&p->p_xsh); |
| 535 | |
| 536 | return (0); |
| 537 | } |
| 538 | |
| 539 | int |
| 540 | mpath_path_detach(struct mpath_path *p) |
| 541 | { |
| 542 | struct mpath_group *g = p->p_group; |
| 543 | struct mpath_dev *d; |
| 544 | struct mpath_path *np = NULL((void *)0); |
| 545 | |
| 546 | #ifdef DIAGNOSTIC1 |
| 547 | if (g == NULL((void *)0)) |
| 548 | panic("mpath: detaching a path from a nonexistent bus"); |
| 549 | #endif /* DIAGNOSTIC */ |
| 550 | d = g->g_dev; |
| 551 | p->p_group = NULL((void *)0); |
| 552 | |
| 553 | mtx_enter(&d->d_mtx); |
| 554 | TAILQ_REMOVE(&g->g_paths, p, p_entry)do { if (((p)->p_entry.tqe_next) != ((void *)0)) (p)->p_entry .tqe_next->p_entry.tqe_prev = (p)->p_entry.tqe_prev; else (&g->g_paths)->tqh_last = (p)->p_entry.tqe_prev ; *(p)->p_entry.tqe_prev = (p)->p_entry.tqe_next; ((p)-> p_entry.tqe_prev) = ((void *)-1); ((p)->p_entry.tqe_next) = ((void *)-1); } while (0); |
| 555 | if (d->d_next_path == p) |
| 556 | d->d_next_path = TAILQ_FIRST(&g->g_paths)((&g->g_paths)->tqh_first); |
| 557 | |
| 558 | if (TAILQ_EMPTY(&g->g_paths)(((&g->g_paths)->tqh_first) == ((void *)0))) |
| 559 | TAILQ_REMOVE(&d->d_groups, g, g_entry)do { if (((g)->g_entry.tqe_next) != ((void *)0)) (g)->g_entry .tqe_next->g_entry.tqe_prev = (g)->g_entry.tqe_prev; else (&d->d_groups)->tqh_last = (g)->g_entry.tqe_prev ; *(g)->g_entry.tqe_prev = (g)->g_entry.tqe_next; ((g)-> g_entry.tqe_prev) = ((void *)-1); ((g)->g_entry.tqe_next) = ((void *)-1); } while (0); |
| 560 | else |
| 561 | g = NULL((void *)0); |
| 562 | |
| 563 | if (!SIMPLEQ_EMPTY(&d->d_xfers)(((&d->d_xfers)->sqh_first) == ((void *)0))) |
| 564 | np = d->d_next_path; |
| 565 | mtx_leave(&d->d_mtx); |
| 566 | |
| 567 | if (g != NULL((void *)0)) |
| 568 | free(g, M_DEVBUF2, sizeof(*g)); |
| 569 | |
| 570 | scsi_xsh_del(&p->p_xsh); |
| 571 | |
| 572 | if (np == NULL((void *)0)) |
| 573 | mpath_failover(d); |
| 574 | else |
| 575 | scsi_xsh_add(&np->p_xsh); |
| 576 | |
| 577 | return (0); |
| 578 | } |
| 579 | |
| 580 | struct device * |
| 581 | mpath_bootdv(struct device *dev) |
| 582 | { |
| 583 | struct mpath_softc *sc = mpath; |
| 584 | struct mpath_dev *d; |
| 585 | struct mpath_group *g; |
| 586 | struct mpath_path *p; |
| 587 | int target; |
| 588 | |
| 589 | if (sc == NULL((void *)0)) |
| 590 | return (dev); |
| 591 | |
| 592 | for (target = 0; target < MPATH_BUSWIDTH256; target++) { |
| 593 | if ((d = sc->sc_devs[target]) == NULL((void *)0)) |
| 594 | continue; |
| 595 | |
| 596 | TAILQ_FOREACH(g, &d->d_groups, g_entry)for((g) = ((&d->d_groups)->tqh_first); (g) != ((void *)0); (g) = ((g)->g_entry.tqe_next)) { |
| 597 | TAILQ_FOREACH(p, &g->g_paths, p_entry)for((p) = ((&g->g_paths)->tqh_first); (p) != ((void *)0); (p) = ((p)->p_entry.tqe_next)) { |
| 598 | if (p->p_link->device_softc == dev) { |
| 599 | return (scsi_get_link(mpath->sc_scsibus, |
| 600 | target, 0)->device_softc); |
| 601 | } |
| 602 | } |
| 603 | } |
| 604 | } |
| 605 | |
| 606 | return (dev); |
| 607 | } |