1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2003 Silicon Graphics International Corp. 5 * Copyright (c) 2009-2011 Spectra Logic Corporation 6 * Copyright (c) 2012 The FreeBSD Foundation 7 * Copyright (c) 2014-2015 Alexander Motin <mav@FreeBSD.org> 8 * All rights reserved. 9 * 10 * Portions of this software were developed by Edward Tomasz Napierala 11 * under sponsorship from the FreeBSD Foundation. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions, and the following disclaimer, 18 * without modification. 19 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 20 * substantially similar to the "NO WARRANTY" disclaimer below 21 * ("Disclaimer") and any redistribution must be conditioned upon 22 * including a substantially similar Disclaimer requirement for further 23 * binary redistribution. 24 * 25 * NO WARRANTY 26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 27 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 28 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 29 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 30 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 34 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 35 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGES. 37 * 38 * $Id: //depot/users/kenm/FreeBSD-test2/sys/cam/ctl/ctl_backend_block.c#5 $ 39 */ 40 /* 41 * CAM Target Layer driver backend for block devices. 42 * 43 * Author: Ken Merry <ken@FreeBSD.org> 44 */ 45 #include <sys/cdefs.h> 46 __FBSDID("$FreeBSD$"); 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/kernel.h> 51 #include <sys/types.h> 52 #include <sys/kthread.h> 53 #include <sys/bio.h> 54 #include <sys/fcntl.h> 55 #include <sys/limits.h> 56 #include <sys/lock.h> 57 #include <sys/mutex.h> 58 #include <sys/condvar.h> 59 #include <sys/malloc.h> 60 #include <sys/conf.h> 61 #include <sys/ioccom.h> 62 #include <sys/queue.h> 63 #include <sys/sbuf.h> 64 #include <sys/endian.h> 65 #include <sys/uio.h> 66 #include <sys/buf.h> 67 #include <sys/taskqueue.h> 68 #include <sys/vnode.h> 69 #include <sys/namei.h> 70 #include <sys/mount.h> 71 #include <sys/disk.h> 72 #include <sys/fcntl.h> 73 #include <sys/filedesc.h> 74 #include <sys/filio.h> 75 #include <sys/proc.h> 76 #include <sys/pcpu.h> 77 #include <sys/module.h> 78 #include <sys/sdt.h> 79 #include <sys/devicestat.h> 80 #include <sys/sysctl.h> 81 #include <sys/nv.h> 82 #include <sys/dnv.h> 83 #include <sys/sx.h> 84 85 #include <geom/geom.h> 86 87 #include <cam/cam.h> 88 #include <cam/scsi/scsi_all.h> 89 #include <cam/scsi/scsi_da.h> 90 #include <cam/ctl/ctl_io.h> 91 #include <cam/ctl/ctl.h> 92 #include <cam/ctl/ctl_backend.h> 93 #include <cam/ctl/ctl_ioctl.h> 94 #include <cam/ctl/ctl_ha.h> 95 #include <cam/ctl/ctl_scsi_all.h> 96 #include <cam/ctl/ctl_private.h> 97 #include <cam/ctl/ctl_error.h> 98 99 /* 100 * The idea here is that we'll allocate enough S/G space to hold a 1MB 101 * I/O. If we get an I/O larger than that, we'll split it. 102 */ 103 #define CTLBLK_HALF_IO_SIZE (512 * 1024) 104 #define CTLBLK_MAX_IO_SIZE (CTLBLK_HALF_IO_SIZE * 2) 105 #define CTLBLK_MIN_SEG (128 * 1024) 106 #define CTLBLK_MAX_SEG MIN(CTLBLK_HALF_IO_SIZE, maxphys) 107 #define CTLBLK_HALF_SEGS MAX(CTLBLK_HALF_IO_SIZE / CTLBLK_MIN_SEG, 1) 108 #define CTLBLK_MAX_SEGS (CTLBLK_HALF_SEGS * 2) 109 #define CTLBLK_NUM_SEGS (CTLBLK_MAX_IO_SIZE / CTLBLK_MAX_SEG) 110 111 #ifdef CTLBLK_DEBUG 112 #define DPRINTF(fmt, args...) \ 113 printf("cbb(%s:%d): " fmt, __FUNCTION__, __LINE__, ##args) 114 #else 115 #define DPRINTF(fmt, args...) do {} while(0) 116 #endif 117 118 #define PRIV(io) \ 119 ((struct ctl_ptr_len_flags *)&(io)->io_hdr.ctl_private[CTL_PRIV_BACKEND]) 120 #define ARGS(io) \ 121 ((struct ctl_lba_len_flags *)&(io)->io_hdr.ctl_private[CTL_PRIV_LBA_LEN]) 122 123 SDT_PROVIDER_DEFINE(cbb); 124 125 typedef enum { 126 CTL_BE_BLOCK_LUN_UNCONFIGURED = 0x01, 127 CTL_BE_BLOCK_LUN_WAITING = 0x04, 128 } ctl_be_block_lun_flags; 129 130 typedef enum { 131 CTL_BE_BLOCK_NONE, 132 CTL_BE_BLOCK_DEV, 133 CTL_BE_BLOCK_FILE 134 } ctl_be_block_type; 135 136 struct ctl_be_block_filedata { 137 struct ucred *cred; 138 }; 139 140 union ctl_be_block_bedata { 141 struct ctl_be_block_filedata file; 142 }; 143 144 struct ctl_be_block_io; 145 struct ctl_be_block_lun; 146 147 typedef void (*cbb_dispatch_t)(struct ctl_be_block_lun *be_lun, 148 struct ctl_be_block_io *beio); 149 typedef uint64_t (*cbb_getattr_t)(struct ctl_be_block_lun *be_lun, 150 const char *attrname); 151 152 /* 153 * Backend LUN structure. There is a 1:1 mapping between a block device 154 * and a backend block LUN, and between a backend block LUN and a CTL LUN. 155 */ 156 struct ctl_be_block_lun { 157 struct ctl_be_lun cbe_lun; /* Must be first element. */ 158 struct ctl_lun_create_params params; 159 char *dev_path; 160 ctl_be_block_type dev_type; 161 struct vnode *vn; 162 union ctl_be_block_bedata backend; 163 cbb_dispatch_t dispatch; 164 cbb_dispatch_t lun_flush; 165 cbb_dispatch_t unmap; 166 cbb_dispatch_t get_lba_status; 167 cbb_getattr_t getattr; 168 uint64_t size_blocks; 169 uint64_t size_bytes; 170 struct ctl_be_block_softc *softc; 171 struct devstat *disk_stats; 172 ctl_be_block_lun_flags flags; 173 SLIST_ENTRY(ctl_be_block_lun) links; 174 struct taskqueue *io_taskqueue; 175 struct task io_task; 176 int num_threads; 177 STAILQ_HEAD(, ctl_io_hdr) input_queue; 178 STAILQ_HEAD(, ctl_io_hdr) config_read_queue; 179 STAILQ_HEAD(, ctl_io_hdr) config_write_queue; 180 STAILQ_HEAD(, ctl_io_hdr) datamove_queue; 181 struct mtx_padalign io_lock; 182 struct mtx_padalign queue_lock; 183 }; 184 185 /* 186 * Overall softc structure for the block backend module. 187 */ 188 struct ctl_be_block_softc { 189 struct sx modify_lock; 190 struct mtx lock; 191 int num_luns; 192 SLIST_HEAD(, ctl_be_block_lun) lun_list; 193 uma_zone_t beio_zone; 194 uma_zone_t bufmin_zone; 195 uma_zone_t bufmax_zone; 196 }; 197 198 static struct ctl_be_block_softc backend_block_softc; 199 200 /* 201 * Per-I/O information. 202 */ 203 struct ctl_be_block_io { 204 union ctl_io *io; 205 struct ctl_sg_entry sg_segs[CTLBLK_MAX_SEGS]; 206 struct iovec xiovecs[CTLBLK_MAX_SEGS]; 207 int refcnt; 208 int bio_cmd; 209 int two_sglists; 210 int num_segs; 211 int num_bios_sent; 212 int num_bios_done; 213 int send_complete; 214 int first_error; 215 uint64_t first_error_offset; 216 struct bintime ds_t0; 217 devstat_tag_type ds_tag_type; 218 devstat_trans_flags ds_trans_type; 219 uint64_t io_len; 220 uint64_t io_offset; 221 int io_arg; 222 struct ctl_be_block_softc *softc; 223 struct ctl_be_block_lun *lun; 224 void (*beio_cont)(struct ctl_be_block_io *beio); /* to continue processing */ 225 }; 226 227 extern struct ctl_softc *control_softc; 228 229 static int cbb_num_threads = 14; 230 SYSCTL_NODE(_kern_cam_ctl, OID_AUTO, block, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 231 "CAM Target Layer Block Backend"); 232 SYSCTL_INT(_kern_cam_ctl_block, OID_AUTO, num_threads, CTLFLAG_RWTUN, 233 &cbb_num_threads, 0, "Number of threads per backing file"); 234 235 static struct ctl_be_block_io *ctl_alloc_beio(struct ctl_be_block_softc *softc); 236 static void ctl_free_beio(struct ctl_be_block_io *beio); 237 static void ctl_complete_beio(struct ctl_be_block_io *beio); 238 static int ctl_be_block_move_done(union ctl_io *io); 239 static void ctl_be_block_biodone(struct bio *bio); 240 static void ctl_be_block_flush_file(struct ctl_be_block_lun *be_lun, 241 struct ctl_be_block_io *beio); 242 static void ctl_be_block_dispatch_file(struct ctl_be_block_lun *be_lun, 243 struct ctl_be_block_io *beio); 244 static void ctl_be_block_gls_file(struct ctl_be_block_lun *be_lun, 245 struct ctl_be_block_io *beio); 246 static uint64_t ctl_be_block_getattr_file(struct ctl_be_block_lun *be_lun, 247 const char *attrname); 248 static void ctl_be_block_flush_dev(struct ctl_be_block_lun *be_lun, 249 struct ctl_be_block_io *beio); 250 static void ctl_be_block_unmap_dev(struct ctl_be_block_lun *be_lun, 251 struct ctl_be_block_io *beio); 252 static void ctl_be_block_dispatch_dev(struct ctl_be_block_lun *be_lun, 253 struct ctl_be_block_io *beio); 254 static uint64_t ctl_be_block_getattr_dev(struct ctl_be_block_lun *be_lun, 255 const char *attrname); 256 static void ctl_be_block_cr_dispatch(struct ctl_be_block_lun *be_lun, 257 union ctl_io *io); 258 static void ctl_be_block_cw_dispatch(struct ctl_be_block_lun *be_lun, 259 union ctl_io *io); 260 static void ctl_be_block_dispatch(struct ctl_be_block_lun *be_lun, 261 union ctl_io *io); 262 static void ctl_be_block_worker(void *context, int pending); 263 static int ctl_be_block_submit(union ctl_io *io); 264 static int ctl_be_block_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, 265 int flag, struct thread *td); 266 static int ctl_be_block_open_file(struct ctl_be_block_lun *be_lun, 267 struct ctl_lun_req *req); 268 static int ctl_be_block_open_dev(struct ctl_be_block_lun *be_lun, 269 struct ctl_lun_req *req); 270 static int ctl_be_block_close(struct ctl_be_block_lun *be_lun); 271 static int ctl_be_block_open(struct ctl_be_block_lun *be_lun, 272 struct ctl_lun_req *req); 273 static int ctl_be_block_create(struct ctl_be_block_softc *softc, 274 struct ctl_lun_req *req); 275 static int ctl_be_block_rm(struct ctl_be_block_softc *softc, 276 struct ctl_lun_req *req); 277 static int ctl_be_block_modify(struct ctl_be_block_softc *softc, 278 struct ctl_lun_req *req); 279 static void ctl_be_block_lun_shutdown(struct ctl_be_lun *cbe_lun); 280 static int ctl_be_block_config_write(union ctl_io *io); 281 static int ctl_be_block_config_read(union ctl_io *io); 282 static int ctl_be_block_lun_info(struct ctl_be_lun *cbe_lun, struct sbuf *sb); 283 static uint64_t ctl_be_block_lun_attr(struct ctl_be_lun *cbe_lun, const char *attrname); 284 static int ctl_be_block_init(void); 285 static int ctl_be_block_shutdown(void); 286 287 static struct ctl_backend_driver ctl_be_block_driver = 288 { 289 .name = "block", 290 .flags = CTL_BE_FLAG_HAS_CONFIG, 291 .init = ctl_be_block_init, 292 .shutdown = ctl_be_block_shutdown, 293 .data_submit = ctl_be_block_submit, 294 .data_move_done = ctl_be_block_move_done, 295 .config_read = ctl_be_block_config_read, 296 .config_write = ctl_be_block_config_write, 297 .ioctl = ctl_be_block_ioctl, 298 .lun_info = ctl_be_block_lun_info, 299 .lun_attr = ctl_be_block_lun_attr 300 }; 301 302 MALLOC_DEFINE(M_CTLBLK, "ctlblock", "Memory used for CTL block backend"); 303 CTL_BACKEND_DECLARE(cbb, ctl_be_block_driver); 304 305 static void 306 ctl_alloc_seg(struct ctl_be_block_softc *softc, struct ctl_sg_entry *sg, 307 size_t len) 308 { 309 310 if (len <= CTLBLK_MIN_SEG) { 311 sg->addr = uma_zalloc(softc->bufmin_zone, M_WAITOK); 312 } else { 313 KASSERT(len <= CTLBLK_MAX_SEG, 314 ("Too large alloc %zu > %lu", len, CTLBLK_MAX_SEG)); 315 sg->addr = uma_zalloc(softc->bufmax_zone, M_WAITOK); 316 } 317 sg->len = len; 318 } 319 320 static void 321 ctl_free_seg(struct ctl_be_block_softc *softc, struct ctl_sg_entry *sg) 322 { 323 324 if (sg->len <= CTLBLK_MIN_SEG) { 325 uma_zfree(softc->bufmin_zone, sg->addr); 326 } else { 327 KASSERT(sg->len <= CTLBLK_MAX_SEG, 328 ("Too large free %zu > %lu", sg->len, CTLBLK_MAX_SEG)); 329 uma_zfree(softc->bufmax_zone, sg->addr); 330 } 331 } 332 333 static struct ctl_be_block_io * 334 ctl_alloc_beio(struct ctl_be_block_softc *softc) 335 { 336 struct ctl_be_block_io *beio; 337 338 beio = uma_zalloc(softc->beio_zone, M_WAITOK | M_ZERO); 339 beio->softc = softc; 340 beio->refcnt = 1; 341 return (beio); 342 } 343 344 static void 345 ctl_real_free_beio(struct ctl_be_block_io *beio) 346 { 347 struct ctl_be_block_softc *softc = beio->softc; 348 int i; 349 350 for (i = 0; i < beio->num_segs; i++) { 351 ctl_free_seg(softc, &beio->sg_segs[i]); 352 353 /* For compare we had two equal S/G lists. */ 354 if (beio->two_sglists) { 355 ctl_free_seg(softc, 356 &beio->sg_segs[i + CTLBLK_HALF_SEGS]); 357 } 358 } 359 360 uma_zfree(softc->beio_zone, beio); 361 } 362 363 static void 364 ctl_refcnt_beio(void *arg, int diff) 365 { 366 struct ctl_be_block_io *beio = arg; 367 368 if (atomic_fetchadd_int(&beio->refcnt, diff) + diff == 0) 369 ctl_real_free_beio(beio); 370 } 371 372 static void 373 ctl_free_beio(struct ctl_be_block_io *beio) 374 { 375 376 ctl_refcnt_beio(beio, -1); 377 } 378 379 static void 380 ctl_complete_beio(struct ctl_be_block_io *beio) 381 { 382 union ctl_io *io = beio->io; 383 384 if (beio->beio_cont != NULL) { 385 beio->beio_cont(beio); 386 } else { 387 ctl_free_beio(beio); 388 ctl_data_submit_done(io); 389 } 390 } 391 392 static size_t 393 cmp(uint8_t *a, uint8_t *b, size_t size) 394 { 395 size_t i; 396 397 for (i = 0; i < size; i++) { 398 if (a[i] != b[i]) 399 break; 400 } 401 return (i); 402 } 403 404 static void 405 ctl_be_block_compare(union ctl_io *io) 406 { 407 struct ctl_be_block_io *beio; 408 uint64_t off, res; 409 int i; 410 uint8_t info[8]; 411 412 beio = (struct ctl_be_block_io *)PRIV(io)->ptr; 413 off = 0; 414 for (i = 0; i < beio->num_segs; i++) { 415 res = cmp(beio->sg_segs[i].addr, 416 beio->sg_segs[i + CTLBLK_HALF_SEGS].addr, 417 beio->sg_segs[i].len); 418 off += res; 419 if (res < beio->sg_segs[i].len) 420 break; 421 } 422 if (i < beio->num_segs) { 423 scsi_u64to8b(off, info); 424 ctl_set_sense(&io->scsiio, /*current_error*/ 1, 425 /*sense_key*/ SSD_KEY_MISCOMPARE, 426 /*asc*/ 0x1D, /*ascq*/ 0x00, 427 /*type*/ SSD_ELEM_INFO, 428 /*size*/ sizeof(info), /*data*/ &info, 429 /*type*/ SSD_ELEM_NONE); 430 } else 431 ctl_set_success(&io->scsiio); 432 } 433 434 static int 435 ctl_be_block_move_done(union ctl_io *io) 436 { 437 struct ctl_be_block_io *beio; 438 struct ctl_be_block_lun *be_lun; 439 struct ctl_lba_len_flags *lbalen; 440 #ifdef CTL_TIME_IO 441 struct bintime cur_bt; 442 #endif 443 444 beio = (struct ctl_be_block_io *)PRIV(io)->ptr; 445 be_lun = beio->lun; 446 447 DPRINTF("entered\n"); 448 449 #ifdef CTL_TIME_IO 450 getbinuptime(&cur_bt); 451 bintime_sub(&cur_bt, &io->io_hdr.dma_start_bt); 452 bintime_add(&io->io_hdr.dma_bt, &cur_bt); 453 #endif 454 io->io_hdr.num_dmas++; 455 io->scsiio.kern_rel_offset += io->scsiio.kern_data_len; 456 457 /* 458 * We set status at this point for read commands, and write 459 * commands with errors. 460 */ 461 if (io->io_hdr.flags & CTL_FLAG_ABORT) { 462 ; 463 } else if ((io->io_hdr.port_status != 0) && 464 ((io->io_hdr.status & CTL_STATUS_MASK) == CTL_STATUS_NONE || 465 (io->io_hdr.status & CTL_STATUS_MASK) == CTL_SUCCESS)) { 466 ctl_set_internal_failure(&io->scsiio, /*sks_valid*/ 1, 467 /*retry_count*/ io->io_hdr.port_status); 468 } else if (io->scsiio.kern_data_resid != 0 && 469 (io->io_hdr.flags & CTL_FLAG_DATA_MASK) == CTL_FLAG_DATA_OUT && 470 ((io->io_hdr.status & CTL_STATUS_MASK) == CTL_STATUS_NONE || 471 (io->io_hdr.status & CTL_STATUS_MASK) == CTL_SUCCESS)) { 472 ctl_set_invalid_field_ciu(&io->scsiio); 473 } else if ((io->io_hdr.port_status == 0) && 474 ((io->io_hdr.status & CTL_STATUS_MASK) == CTL_STATUS_NONE)) { 475 lbalen = ARGS(beio->io); 476 if (lbalen->flags & CTL_LLF_READ) { 477 ctl_set_success(&io->scsiio); 478 } else if (lbalen->flags & CTL_LLF_COMPARE) { 479 /* We have two data blocks ready for comparison. */ 480 ctl_be_block_compare(io); 481 } 482 } 483 484 /* 485 * If this is a read, or a write with errors, it is done. 486 */ 487 if ((beio->bio_cmd == BIO_READ) 488 || ((io->io_hdr.flags & CTL_FLAG_ABORT) != 0) 489 || ((io->io_hdr.status & CTL_STATUS_MASK) != CTL_STATUS_NONE)) { 490 ctl_complete_beio(beio); 491 return (0); 492 } 493 494 /* 495 * At this point, we have a write and the DMA completed 496 * successfully. We now have to queue it to the task queue to 497 * execute the backend I/O. That is because we do blocking 498 * memory allocations, and in the file backing case, blocking I/O. 499 * This move done routine is generally called in the SIM's 500 * interrupt context, and therefore we cannot block. 501 */ 502 mtx_lock(&be_lun->queue_lock); 503 STAILQ_INSERT_TAIL(&be_lun->datamove_queue, &io->io_hdr, links); 504 mtx_unlock(&be_lun->queue_lock); 505 taskqueue_enqueue(be_lun->io_taskqueue, &be_lun->io_task); 506 507 return (0); 508 } 509 510 static void 511 ctl_be_block_biodone(struct bio *bio) 512 { 513 struct ctl_be_block_io *beio; 514 struct ctl_be_block_lun *be_lun; 515 union ctl_io *io; 516 int error; 517 518 beio = bio->bio_caller1; 519 be_lun = beio->lun; 520 io = beio->io; 521 522 DPRINTF("entered\n"); 523 524 error = bio->bio_error; 525 mtx_lock(&be_lun->io_lock); 526 if (error != 0 && 527 (beio->first_error == 0 || 528 bio->bio_offset < beio->first_error_offset)) { 529 beio->first_error = error; 530 beio->first_error_offset = bio->bio_offset; 531 } 532 533 beio->num_bios_done++; 534 535 /* 536 * XXX KDM will this cause WITNESS to complain? Holding a lock 537 * during the free might cause it to complain. 538 */ 539 g_destroy_bio(bio); 540 541 /* 542 * If the send complete bit isn't set, or we aren't the last I/O to 543 * complete, then we're done. 544 */ 545 if ((beio->send_complete == 0) 546 || (beio->num_bios_done < beio->num_bios_sent)) { 547 mtx_unlock(&be_lun->io_lock); 548 return; 549 } 550 551 /* 552 * At this point, we've verified that we are the last I/O to 553 * complete, so it's safe to drop the lock. 554 */ 555 devstat_end_transaction(beio->lun->disk_stats, beio->io_len, 556 beio->ds_tag_type, beio->ds_trans_type, 557 /*now*/ NULL, /*then*/&beio->ds_t0); 558 mtx_unlock(&be_lun->io_lock); 559 560 /* 561 * If there are any errors from the backing device, we fail the 562 * entire I/O with a medium error. 563 */ 564 error = beio->first_error; 565 if (error != 0) { 566 if (error == EOPNOTSUPP) { 567 ctl_set_invalid_opcode(&io->scsiio); 568 } else if (error == ENOSPC || error == EDQUOT) { 569 ctl_set_space_alloc_fail(&io->scsiio); 570 } else if (error == EROFS || error == EACCES) { 571 ctl_set_hw_write_protected(&io->scsiio); 572 } else if (beio->bio_cmd == BIO_FLUSH) { 573 /* XXX KDM is there is a better error here? */ 574 ctl_set_internal_failure(&io->scsiio, 575 /*sks_valid*/ 1, 576 /*retry_count*/ 0xbad2); 577 } else { 578 ctl_set_medium_error(&io->scsiio, 579 beio->bio_cmd == BIO_READ); 580 } 581 ctl_complete_beio(beio); 582 return; 583 } 584 585 /* 586 * If this is a write, a flush, a delete or verify, we're all done. 587 * If this is a read, we can now send the data to the user. 588 */ 589 if ((beio->bio_cmd == BIO_WRITE) 590 || (beio->bio_cmd == BIO_FLUSH) 591 || (beio->bio_cmd == BIO_DELETE) 592 || (ARGS(io)->flags & CTL_LLF_VERIFY)) { 593 ctl_set_success(&io->scsiio); 594 ctl_complete_beio(beio); 595 } else { 596 if ((ARGS(io)->flags & CTL_LLF_READ) && 597 beio->beio_cont == NULL) { 598 ctl_set_success(&io->scsiio); 599 ctl_serseq_done(io); 600 } 601 #ifdef CTL_TIME_IO 602 getbinuptime(&io->io_hdr.dma_start_bt); 603 #endif 604 ctl_datamove(io); 605 } 606 } 607 608 static void 609 ctl_be_block_flush_file(struct ctl_be_block_lun *be_lun, 610 struct ctl_be_block_io *beio) 611 { 612 union ctl_io *io = beio->io; 613 struct mount *mountpoint; 614 int error, lock_flags; 615 616 DPRINTF("entered\n"); 617 618 binuptime(&beio->ds_t0); 619 devstat_start_transaction(beio->lun->disk_stats, &beio->ds_t0); 620 621 (void) vn_start_write(be_lun->vn, &mountpoint, V_WAIT); 622 623 if (MNT_SHARED_WRITES(mountpoint) || 624 ((mountpoint == NULL) && MNT_SHARED_WRITES(be_lun->vn->v_mount))) 625 lock_flags = LK_SHARED; 626 else 627 lock_flags = LK_EXCLUSIVE; 628 vn_lock(be_lun->vn, lock_flags | LK_RETRY); 629 error = VOP_FSYNC(be_lun->vn, beio->io_arg ? MNT_NOWAIT : MNT_WAIT, 630 curthread); 631 VOP_UNLOCK(be_lun->vn); 632 633 vn_finished_write(mountpoint); 634 635 mtx_lock(&be_lun->io_lock); 636 devstat_end_transaction(beio->lun->disk_stats, beio->io_len, 637 beio->ds_tag_type, beio->ds_trans_type, 638 /*now*/ NULL, /*then*/&beio->ds_t0); 639 mtx_unlock(&be_lun->io_lock); 640 641 if (error == 0) 642 ctl_set_success(&io->scsiio); 643 else { 644 /* XXX KDM is there is a better error here? */ 645 ctl_set_internal_failure(&io->scsiio, 646 /*sks_valid*/ 1, 647 /*retry_count*/ 0xbad1); 648 } 649 650 ctl_complete_beio(beio); 651 } 652 653 SDT_PROBE_DEFINE1(cbb, , read, file_start, "uint64_t"); 654 SDT_PROBE_DEFINE1(cbb, , write, file_start, "uint64_t"); 655 SDT_PROBE_DEFINE1(cbb, , read, file_done,"uint64_t"); 656 SDT_PROBE_DEFINE1(cbb, , write, file_done, "uint64_t"); 657 658 static void 659 ctl_be_block_dispatch_file(struct ctl_be_block_lun *be_lun, 660 struct ctl_be_block_io *beio) 661 { 662 struct ctl_be_block_filedata *file_data; 663 union ctl_io *io; 664 struct uio xuio; 665 struct iovec *xiovec; 666 size_t s; 667 int error, flags, i; 668 669 DPRINTF("entered\n"); 670 671 file_data = &be_lun->backend.file; 672 io = beio->io; 673 flags = 0; 674 if (ARGS(io)->flags & CTL_LLF_DPO) 675 flags |= IO_DIRECT; 676 if (beio->bio_cmd == BIO_WRITE && ARGS(io)->flags & CTL_LLF_FUA) 677 flags |= IO_SYNC; 678 679 bzero(&xuio, sizeof(xuio)); 680 if (beio->bio_cmd == BIO_READ) { 681 SDT_PROBE0(cbb, , read, file_start); 682 xuio.uio_rw = UIO_READ; 683 } else { 684 SDT_PROBE0(cbb, , write, file_start); 685 xuio.uio_rw = UIO_WRITE; 686 } 687 xuio.uio_offset = beio->io_offset; 688 xuio.uio_resid = beio->io_len; 689 xuio.uio_segflg = UIO_SYSSPACE; 690 xuio.uio_iov = beio->xiovecs; 691 xuio.uio_iovcnt = beio->num_segs; 692 xuio.uio_td = curthread; 693 694 for (i = 0, xiovec = xuio.uio_iov; i < xuio.uio_iovcnt; i++, xiovec++) { 695 xiovec->iov_base = beio->sg_segs[i].addr; 696 xiovec->iov_len = beio->sg_segs[i].len; 697 } 698 699 binuptime(&beio->ds_t0); 700 devstat_start_transaction(beio->lun->disk_stats, &beio->ds_t0); 701 702 if (beio->bio_cmd == BIO_READ) { 703 vn_lock(be_lun->vn, LK_SHARED | LK_RETRY); 704 705 /* 706 * UFS pays attention to IO_DIRECT for reads. If the 707 * DIRECTIO option is configured into the kernel, it calls 708 * ffs_rawread(). But that only works for single-segment 709 * uios with user space addresses. In our case, with a 710 * kernel uio, it still reads into the buffer cache, but it 711 * will just try to release the buffer from the cache later 712 * on in ffs_read(). 713 * 714 * ZFS does not pay attention to IO_DIRECT for reads. 715 * 716 * UFS does not pay attention to IO_SYNC for reads. 717 * 718 * ZFS pays attention to IO_SYNC (which translates into the 719 * Solaris define FRSYNC for zfs_read()) for reads. It 720 * attempts to sync the file before reading. 721 */ 722 error = VOP_READ(be_lun->vn, &xuio, flags, file_data->cred); 723 724 VOP_UNLOCK(be_lun->vn); 725 SDT_PROBE0(cbb, , read, file_done); 726 if (error == 0 && xuio.uio_resid > 0) { 727 /* 728 * If we red less then requested (EOF), then 729 * we should clean the rest of the buffer. 730 */ 731 s = beio->io_len - xuio.uio_resid; 732 for (i = 0; i < beio->num_segs; i++) { 733 if (s >= beio->sg_segs[i].len) { 734 s -= beio->sg_segs[i].len; 735 continue; 736 } 737 bzero((uint8_t *)beio->sg_segs[i].addr + s, 738 beio->sg_segs[i].len - s); 739 s = 0; 740 } 741 } 742 } else { 743 struct mount *mountpoint; 744 int lock_flags; 745 746 (void)vn_start_write(be_lun->vn, &mountpoint, V_WAIT); 747 748 if (MNT_SHARED_WRITES(mountpoint) || ((mountpoint == NULL) 749 && MNT_SHARED_WRITES(be_lun->vn->v_mount))) 750 lock_flags = LK_SHARED; 751 else 752 lock_flags = LK_EXCLUSIVE; 753 vn_lock(be_lun->vn, lock_flags | LK_RETRY); 754 755 /* 756 * UFS pays attention to IO_DIRECT for writes. The write 757 * is done asynchronously. (Normally the write would just 758 * get put into cache. 759 * 760 * UFS pays attention to IO_SYNC for writes. It will 761 * attempt to write the buffer out synchronously if that 762 * flag is set. 763 * 764 * ZFS does not pay attention to IO_DIRECT for writes. 765 * 766 * ZFS pays attention to IO_SYNC (a.k.a. FSYNC or FRSYNC) 767 * for writes. It will flush the transaction from the 768 * cache before returning. 769 */ 770 error = VOP_WRITE(be_lun->vn, &xuio, flags, file_data->cred); 771 VOP_UNLOCK(be_lun->vn); 772 773 vn_finished_write(mountpoint); 774 SDT_PROBE0(cbb, , write, file_done); 775 } 776 777 mtx_lock(&be_lun->io_lock); 778 devstat_end_transaction(beio->lun->disk_stats, beio->io_len, 779 beio->ds_tag_type, beio->ds_trans_type, 780 /*now*/ NULL, /*then*/&beio->ds_t0); 781 mtx_unlock(&be_lun->io_lock); 782 783 /* 784 * If we got an error, set the sense data to "MEDIUM ERROR" and 785 * return the I/O to the user. 786 */ 787 if (error != 0) { 788 if (error == ENOSPC || error == EDQUOT) { 789 ctl_set_space_alloc_fail(&io->scsiio); 790 } else if (error == EROFS || error == EACCES) { 791 ctl_set_hw_write_protected(&io->scsiio); 792 } else { 793 ctl_set_medium_error(&io->scsiio, 794 beio->bio_cmd == BIO_READ); 795 } 796 ctl_complete_beio(beio); 797 return; 798 } 799 800 /* 801 * If this is a write or a verify, we're all done. 802 * If this is a read, we can now send the data to the user. 803 */ 804 if ((beio->bio_cmd == BIO_WRITE) || 805 (ARGS(io)->flags & CTL_LLF_VERIFY)) { 806 ctl_set_success(&io->scsiio); 807 ctl_complete_beio(beio); 808 } else { 809 if ((ARGS(io)->flags & CTL_LLF_READ) && 810 beio->beio_cont == NULL) { 811 ctl_set_success(&io->scsiio); 812 ctl_serseq_done(io); 813 } 814 #ifdef CTL_TIME_IO 815 getbinuptime(&io->io_hdr.dma_start_bt); 816 #endif 817 ctl_datamove(io); 818 } 819 } 820 821 static void 822 ctl_be_block_gls_file(struct ctl_be_block_lun *be_lun, 823 struct ctl_be_block_io *beio) 824 { 825 union ctl_io *io = beio->io; 826 struct ctl_lba_len_flags *lbalen = ARGS(io); 827 struct scsi_get_lba_status_data *data; 828 off_t roff, off; 829 int error, status; 830 831 DPRINTF("entered\n"); 832 833 off = roff = ((off_t)lbalen->lba) * be_lun->cbe_lun.blocksize; 834 vn_lock(be_lun->vn, LK_SHARED | LK_RETRY); 835 error = VOP_IOCTL(be_lun->vn, FIOSEEKHOLE, &off, 836 0, curthread->td_ucred, curthread); 837 if (error == 0 && off > roff) 838 status = 0; /* mapped up to off */ 839 else { 840 error = VOP_IOCTL(be_lun->vn, FIOSEEKDATA, &off, 841 0, curthread->td_ucred, curthread); 842 if (error == 0 && off > roff) 843 status = 1; /* deallocated up to off */ 844 else { 845 status = 0; /* unknown up to the end */ 846 off = be_lun->size_bytes; 847 } 848 } 849 VOP_UNLOCK(be_lun->vn); 850 851 data = (struct scsi_get_lba_status_data *)io->scsiio.kern_data_ptr; 852 scsi_u64to8b(lbalen->lba, data->descr[0].addr); 853 scsi_ulto4b(MIN(UINT32_MAX, off / be_lun->cbe_lun.blocksize - 854 lbalen->lba), data->descr[0].length); 855 data->descr[0].status = status; 856 857 ctl_complete_beio(beio); 858 } 859 860 static uint64_t 861 ctl_be_block_getattr_file(struct ctl_be_block_lun *be_lun, const char *attrname) 862 { 863 struct vattr vattr; 864 struct statfs statfs; 865 uint64_t val; 866 int error; 867 868 val = UINT64_MAX; 869 if (be_lun->vn == NULL) 870 return (val); 871 vn_lock(be_lun->vn, LK_SHARED | LK_RETRY); 872 if (strcmp(attrname, "blocksused") == 0) { 873 error = VOP_GETATTR(be_lun->vn, &vattr, curthread->td_ucred); 874 if (error == 0) 875 val = vattr.va_bytes / be_lun->cbe_lun.blocksize; 876 } 877 if (strcmp(attrname, "blocksavail") == 0 && 878 !VN_IS_DOOMED(be_lun->vn)) { 879 error = VFS_STATFS(be_lun->vn->v_mount, &statfs); 880 if (error == 0) 881 val = statfs.f_bavail * statfs.f_bsize / 882 be_lun->cbe_lun.blocksize; 883 } 884 VOP_UNLOCK(be_lun->vn); 885 return (val); 886 } 887 888 static void 889 ctl_be_block_dispatch_zvol(struct ctl_be_block_lun *be_lun, 890 struct ctl_be_block_io *beio) 891 { 892 union ctl_io *io; 893 struct cdevsw *csw; 894 struct cdev *dev; 895 struct uio xuio; 896 struct iovec *xiovec; 897 int error, flags, i, ref; 898 899 DPRINTF("entered\n"); 900 901 io = beio->io; 902 flags = 0; 903 if (ARGS(io)->flags & CTL_LLF_DPO) 904 flags |= IO_DIRECT; 905 if (beio->bio_cmd == BIO_WRITE && ARGS(io)->flags & CTL_LLF_FUA) 906 flags |= IO_SYNC; 907 908 bzero(&xuio, sizeof(xuio)); 909 if (beio->bio_cmd == BIO_READ) { 910 SDT_PROBE0(cbb, , read, file_start); 911 xuio.uio_rw = UIO_READ; 912 } else { 913 SDT_PROBE0(cbb, , write, file_start); 914 xuio.uio_rw = UIO_WRITE; 915 } 916 xuio.uio_offset = beio->io_offset; 917 xuio.uio_resid = beio->io_len; 918 xuio.uio_segflg = UIO_SYSSPACE; 919 xuio.uio_iov = beio->xiovecs; 920 xuio.uio_iovcnt = beio->num_segs; 921 xuio.uio_td = curthread; 922 923 for (i = 0, xiovec = xuio.uio_iov; i < xuio.uio_iovcnt; i++, xiovec++) { 924 xiovec->iov_base = beio->sg_segs[i].addr; 925 xiovec->iov_len = beio->sg_segs[i].len; 926 } 927 928 binuptime(&beio->ds_t0); 929 devstat_start_transaction(beio->lun->disk_stats, &beio->ds_t0); 930 931 csw = devvn_refthread(be_lun->vn, &dev, &ref); 932 if (csw) { 933 if (beio->bio_cmd == BIO_READ) 934 error = csw->d_read(dev, &xuio, flags); 935 else 936 error = csw->d_write(dev, &xuio, flags); 937 dev_relthread(dev, ref); 938 } else 939 error = ENXIO; 940 941 if (beio->bio_cmd == BIO_READ) 942 SDT_PROBE0(cbb, , read, file_done); 943 else 944 SDT_PROBE0(cbb, , write, file_done); 945 946 mtx_lock(&be_lun->io_lock); 947 devstat_end_transaction(beio->lun->disk_stats, beio->io_len, 948 beio->ds_tag_type, beio->ds_trans_type, 949 /*now*/ NULL, /*then*/&beio->ds_t0); 950 mtx_unlock(&be_lun->io_lock); 951 952 /* 953 * If we got an error, set the sense data to "MEDIUM ERROR" and 954 * return the I/O to the user. 955 */ 956 if (error != 0) { 957 if (error == ENOSPC || error == EDQUOT) { 958 ctl_set_space_alloc_fail(&io->scsiio); 959 } else if (error == EROFS || error == EACCES) { 960 ctl_set_hw_write_protected(&io->scsiio); 961 } else { 962 ctl_set_medium_error(&io->scsiio, 963 beio->bio_cmd == BIO_READ); 964 } 965 ctl_complete_beio(beio); 966 return; 967 } 968 969 /* 970 * If this is a write or a verify, we're all done. 971 * If this is a read, we can now send the data to the user. 972 */ 973 if ((beio->bio_cmd == BIO_WRITE) || 974 (ARGS(io)->flags & CTL_LLF_VERIFY)) { 975 ctl_set_success(&io->scsiio); 976 ctl_complete_beio(beio); 977 } else { 978 if ((ARGS(io)->flags & CTL_LLF_READ) && 979 beio->beio_cont == NULL) { 980 ctl_set_success(&io->scsiio); 981 ctl_serseq_done(io); 982 } 983 #ifdef CTL_TIME_IO 984 getbinuptime(&io->io_hdr.dma_start_bt); 985 #endif 986 ctl_datamove(io); 987 } 988 } 989 990 static void 991 ctl_be_block_gls_zvol(struct ctl_be_block_lun *be_lun, 992 struct ctl_be_block_io *beio) 993 { 994 union ctl_io *io = beio->io; 995 struct cdevsw *csw; 996 struct cdev *dev; 997 struct ctl_lba_len_flags *lbalen = ARGS(io); 998 struct scsi_get_lba_status_data *data; 999 off_t roff, off; 1000 int error, ref, status; 1001 1002 DPRINTF("entered\n"); 1003 1004 csw = devvn_refthread(be_lun->vn, &dev, &ref); 1005 if (csw == NULL) { 1006 status = 0; /* unknown up to the end */ 1007 off = be_lun->size_bytes; 1008 goto done; 1009 } 1010 off = roff = ((off_t)lbalen->lba) * be_lun->cbe_lun.blocksize; 1011 error = csw->d_ioctl(dev, FIOSEEKHOLE, (caddr_t)&off, FREAD, 1012 curthread); 1013 if (error == 0 && off > roff) 1014 status = 0; /* mapped up to off */ 1015 else { 1016 error = csw->d_ioctl(dev, FIOSEEKDATA, (caddr_t)&off, FREAD, 1017 curthread); 1018 if (error == 0 && off > roff) 1019 status = 1; /* deallocated up to off */ 1020 else { 1021 status = 0; /* unknown up to the end */ 1022 off = be_lun->size_bytes; 1023 } 1024 } 1025 dev_relthread(dev, ref); 1026 1027 done: 1028 data = (struct scsi_get_lba_status_data *)io->scsiio.kern_data_ptr; 1029 scsi_u64to8b(lbalen->lba, data->descr[0].addr); 1030 scsi_ulto4b(MIN(UINT32_MAX, off / be_lun->cbe_lun.blocksize - 1031 lbalen->lba), data->descr[0].length); 1032 data->descr[0].status = status; 1033 1034 ctl_complete_beio(beio); 1035 } 1036 1037 static void 1038 ctl_be_block_flush_dev(struct ctl_be_block_lun *be_lun, 1039 struct ctl_be_block_io *beio) 1040 { 1041 struct bio *bio; 1042 struct cdevsw *csw; 1043 struct cdev *dev; 1044 int ref; 1045 1046 DPRINTF("entered\n"); 1047 1048 /* This can't fail, it's a blocking allocation. */ 1049 bio = g_alloc_bio(); 1050 1051 bio->bio_cmd = BIO_FLUSH; 1052 bio->bio_offset = 0; 1053 bio->bio_data = 0; 1054 bio->bio_done = ctl_be_block_biodone; 1055 bio->bio_caller1 = beio; 1056 bio->bio_pblkno = 0; 1057 1058 /* 1059 * We don't need to acquire the LUN lock here, because we are only 1060 * sending one bio, and so there is no other context to synchronize 1061 * with. 1062 */ 1063 beio->num_bios_sent = 1; 1064 beio->send_complete = 1; 1065 1066 binuptime(&beio->ds_t0); 1067 devstat_start_transaction(be_lun->disk_stats, &beio->ds_t0); 1068 1069 csw = devvn_refthread(be_lun->vn, &dev, &ref); 1070 if (csw) { 1071 bio->bio_dev = dev; 1072 csw->d_strategy(bio); 1073 dev_relthread(dev, ref); 1074 } else { 1075 bio->bio_error = ENXIO; 1076 ctl_be_block_biodone(bio); 1077 } 1078 } 1079 1080 static void 1081 ctl_be_block_unmap_dev_range(struct ctl_be_block_lun *be_lun, 1082 struct ctl_be_block_io *beio, 1083 uint64_t off, uint64_t len, int last) 1084 { 1085 struct bio *bio; 1086 uint64_t maxlen; 1087 struct cdevsw *csw; 1088 struct cdev *dev; 1089 int ref; 1090 1091 csw = devvn_refthread(be_lun->vn, &dev, &ref); 1092 maxlen = LONG_MAX - (LONG_MAX % be_lun->cbe_lun.blocksize); 1093 while (len > 0) { 1094 bio = g_alloc_bio(); 1095 bio->bio_cmd = BIO_DELETE; 1096 bio->bio_dev = dev; 1097 bio->bio_offset = off; 1098 bio->bio_length = MIN(len, maxlen); 1099 bio->bio_data = 0; 1100 bio->bio_done = ctl_be_block_biodone; 1101 bio->bio_caller1 = beio; 1102 bio->bio_pblkno = off / be_lun->cbe_lun.blocksize; 1103 1104 off += bio->bio_length; 1105 len -= bio->bio_length; 1106 1107 mtx_lock(&be_lun->io_lock); 1108 beio->num_bios_sent++; 1109 if (last && len == 0) 1110 beio->send_complete = 1; 1111 mtx_unlock(&be_lun->io_lock); 1112 1113 if (csw) { 1114 csw->d_strategy(bio); 1115 } else { 1116 bio->bio_error = ENXIO; 1117 ctl_be_block_biodone(bio); 1118 } 1119 } 1120 if (csw) 1121 dev_relthread(dev, ref); 1122 } 1123 1124 static void 1125 ctl_be_block_unmap_dev(struct ctl_be_block_lun *be_lun, 1126 struct ctl_be_block_io *beio) 1127 { 1128 union ctl_io *io; 1129 struct ctl_ptr_len_flags *ptrlen; 1130 struct scsi_unmap_desc *buf, *end; 1131 uint64_t len; 1132 1133 io = beio->io; 1134 1135 DPRINTF("entered\n"); 1136 1137 binuptime(&beio->ds_t0); 1138 devstat_start_transaction(be_lun->disk_stats, &beio->ds_t0); 1139 1140 if (beio->io_offset == -1) { 1141 beio->io_len = 0; 1142 ptrlen = (struct ctl_ptr_len_flags *)&io->io_hdr.ctl_private[CTL_PRIV_LBA_LEN]; 1143 buf = (struct scsi_unmap_desc *)ptrlen->ptr; 1144 end = buf + ptrlen->len / sizeof(*buf); 1145 for (; buf < end; buf++) { 1146 len = (uint64_t)scsi_4btoul(buf->length) * 1147 be_lun->cbe_lun.blocksize; 1148 beio->io_len += len; 1149 ctl_be_block_unmap_dev_range(be_lun, beio, 1150 scsi_8btou64(buf->lba) * be_lun->cbe_lun.blocksize, 1151 len, (end - buf < 2) ? TRUE : FALSE); 1152 } 1153 } else 1154 ctl_be_block_unmap_dev_range(be_lun, beio, 1155 beio->io_offset, beio->io_len, TRUE); 1156 } 1157 1158 static void 1159 ctl_be_block_dispatch_dev(struct ctl_be_block_lun *be_lun, 1160 struct ctl_be_block_io *beio) 1161 { 1162 TAILQ_HEAD(, bio) queue = TAILQ_HEAD_INITIALIZER(queue); 1163 struct bio *bio; 1164 struct cdevsw *csw; 1165 struct cdev *dev; 1166 off_t cur_offset; 1167 int i, max_iosize, ref; 1168 1169 DPRINTF("entered\n"); 1170 csw = devvn_refthread(be_lun->vn, &dev, &ref); 1171 1172 /* 1173 * We have to limit our I/O size to the maximum supported by the 1174 * backend device. 1175 */ 1176 if (csw) { 1177 max_iosize = dev->si_iosize_max; 1178 if (max_iosize < PAGE_SIZE) 1179 max_iosize = DFLTPHYS; 1180 } else 1181 max_iosize = DFLTPHYS; 1182 1183 cur_offset = beio->io_offset; 1184 for (i = 0; i < beio->num_segs; i++) { 1185 size_t cur_size; 1186 uint8_t *cur_ptr; 1187 1188 cur_size = beio->sg_segs[i].len; 1189 cur_ptr = beio->sg_segs[i].addr; 1190 1191 while (cur_size > 0) { 1192 /* This can't fail, it's a blocking allocation. */ 1193 bio = g_alloc_bio(); 1194 1195 KASSERT(bio != NULL, ("g_alloc_bio() failed!\n")); 1196 1197 bio->bio_cmd = beio->bio_cmd; 1198 bio->bio_dev = dev; 1199 bio->bio_caller1 = beio; 1200 bio->bio_length = min(cur_size, max_iosize); 1201 bio->bio_offset = cur_offset; 1202 bio->bio_data = cur_ptr; 1203 bio->bio_done = ctl_be_block_biodone; 1204 bio->bio_pblkno = cur_offset / be_lun->cbe_lun.blocksize; 1205 1206 cur_offset += bio->bio_length; 1207 cur_ptr += bio->bio_length; 1208 cur_size -= bio->bio_length; 1209 1210 TAILQ_INSERT_TAIL(&queue, bio, bio_queue); 1211 beio->num_bios_sent++; 1212 } 1213 } 1214 beio->send_complete = 1; 1215 binuptime(&beio->ds_t0); 1216 devstat_start_transaction(be_lun->disk_stats, &beio->ds_t0); 1217 1218 /* 1219 * Fire off all allocated requests! 1220 */ 1221 while ((bio = TAILQ_FIRST(&queue)) != NULL) { 1222 TAILQ_REMOVE(&queue, bio, bio_queue); 1223 if (csw) 1224 csw->d_strategy(bio); 1225 else { 1226 bio->bio_error = ENXIO; 1227 ctl_be_block_biodone(bio); 1228 } 1229 } 1230 if (csw) 1231 dev_relthread(dev, ref); 1232 } 1233 1234 static uint64_t 1235 ctl_be_block_getattr_dev(struct ctl_be_block_lun *be_lun, const char *attrname) 1236 { 1237 struct diocgattr_arg arg; 1238 struct cdevsw *csw; 1239 struct cdev *dev; 1240 int error, ref; 1241 1242 csw = devvn_refthread(be_lun->vn, &dev, &ref); 1243 if (csw == NULL) 1244 return (UINT64_MAX); 1245 strlcpy(arg.name, attrname, sizeof(arg.name)); 1246 arg.len = sizeof(arg.value.off); 1247 if (csw->d_ioctl) { 1248 error = csw->d_ioctl(dev, DIOCGATTR, (caddr_t)&arg, FREAD, 1249 curthread); 1250 } else 1251 error = ENODEV; 1252 dev_relthread(dev, ref); 1253 if (error != 0) 1254 return (UINT64_MAX); 1255 return (arg.value.off); 1256 } 1257 1258 static void 1259 ctl_be_block_cw_dispatch_sync(struct ctl_be_block_lun *be_lun, 1260 union ctl_io *io) 1261 { 1262 struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun; 1263 struct ctl_be_block_io *beio; 1264 struct ctl_lba_len_flags *lbalen; 1265 1266 DPRINTF("entered\n"); 1267 beio = (struct ctl_be_block_io *)PRIV(io)->ptr; 1268 lbalen = (struct ctl_lba_len_flags *)&io->io_hdr.ctl_private[CTL_PRIV_LBA_LEN]; 1269 1270 beio->io_len = lbalen->len * cbe_lun->blocksize; 1271 beio->io_offset = lbalen->lba * cbe_lun->blocksize; 1272 beio->io_arg = (lbalen->flags & SSC_IMMED) != 0; 1273 beio->bio_cmd = BIO_FLUSH; 1274 beio->ds_trans_type = DEVSTAT_NO_DATA; 1275 DPRINTF("SYNC\n"); 1276 be_lun->lun_flush(be_lun, beio); 1277 } 1278 1279 static void 1280 ctl_be_block_cw_done_ws(struct ctl_be_block_io *beio) 1281 { 1282 union ctl_io *io; 1283 1284 io = beio->io; 1285 ctl_free_beio(beio); 1286 if ((io->io_hdr.flags & CTL_FLAG_ABORT) || 1287 ((io->io_hdr.status & CTL_STATUS_MASK) != CTL_STATUS_NONE && 1288 (io->io_hdr.status & CTL_STATUS_MASK) != CTL_SUCCESS)) { 1289 ctl_config_write_done(io); 1290 return; 1291 } 1292 1293 ctl_be_block_config_write(io); 1294 } 1295 1296 static void 1297 ctl_be_block_cw_dispatch_ws(struct ctl_be_block_lun *be_lun, 1298 union ctl_io *io) 1299 { 1300 struct ctl_be_block_softc *softc = be_lun->softc; 1301 struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun; 1302 struct ctl_be_block_io *beio; 1303 struct ctl_lba_len_flags *lbalen; 1304 uint64_t len_left, lba; 1305 uint32_t pb, pbo, adj; 1306 int i, seglen; 1307 uint8_t *buf, *end; 1308 1309 DPRINTF("entered\n"); 1310 1311 beio = (struct ctl_be_block_io *)PRIV(io)->ptr; 1312 lbalen = ARGS(beio->io); 1313 1314 if (lbalen->flags & ~(SWS_LBDATA | SWS_UNMAP | SWS_ANCHOR | SWS_NDOB) || 1315 (lbalen->flags & (SWS_UNMAP | SWS_ANCHOR) && be_lun->unmap == NULL)) { 1316 ctl_free_beio(beio); 1317 ctl_set_invalid_field(&io->scsiio, 1318 /*sks_valid*/ 1, 1319 /*command*/ 1, 1320 /*field*/ 1, 1321 /*bit_valid*/ 0, 1322 /*bit*/ 0); 1323 ctl_config_write_done(io); 1324 return; 1325 } 1326 1327 if (lbalen->flags & (SWS_UNMAP | SWS_ANCHOR)) { 1328 beio->io_offset = lbalen->lba * cbe_lun->blocksize; 1329 beio->io_len = (uint64_t)lbalen->len * cbe_lun->blocksize; 1330 beio->bio_cmd = BIO_DELETE; 1331 beio->ds_trans_type = DEVSTAT_FREE; 1332 1333 be_lun->unmap(be_lun, beio); 1334 return; 1335 } 1336 1337 beio->bio_cmd = BIO_WRITE; 1338 beio->ds_trans_type = DEVSTAT_WRITE; 1339 1340 DPRINTF("WRITE SAME at LBA %jx len %u\n", 1341 (uintmax_t)lbalen->lba, lbalen->len); 1342 1343 pb = cbe_lun->blocksize << be_lun->cbe_lun.pblockexp; 1344 if (be_lun->cbe_lun.pblockoff > 0) 1345 pbo = pb - cbe_lun->blocksize * be_lun->cbe_lun.pblockoff; 1346 else 1347 pbo = 0; 1348 len_left = (uint64_t)lbalen->len * cbe_lun->blocksize; 1349 for (i = 0, lba = 0; i < CTLBLK_NUM_SEGS && len_left > 0; i++) { 1350 /* 1351 * Setup the S/G entry for this chunk. 1352 */ 1353 seglen = MIN(CTLBLK_MAX_SEG, len_left); 1354 if (pb > cbe_lun->blocksize) { 1355 adj = ((lbalen->lba + lba) * cbe_lun->blocksize + 1356 seglen - pbo) % pb; 1357 if (seglen > adj) 1358 seglen -= adj; 1359 else 1360 seglen -= seglen % cbe_lun->blocksize; 1361 } else 1362 seglen -= seglen % cbe_lun->blocksize; 1363 ctl_alloc_seg(softc, &beio->sg_segs[i], seglen); 1364 1365 DPRINTF("segment %d addr %p len %zd\n", i, 1366 beio->sg_segs[i].addr, beio->sg_segs[i].len); 1367 1368 beio->num_segs++; 1369 len_left -= seglen; 1370 1371 buf = beio->sg_segs[i].addr; 1372 end = buf + seglen; 1373 for (; buf < end; buf += cbe_lun->blocksize) { 1374 if (lbalen->flags & SWS_NDOB) { 1375 memset(buf, 0, cbe_lun->blocksize); 1376 } else { 1377 memcpy(buf, io->scsiio.kern_data_ptr, 1378 cbe_lun->blocksize); 1379 } 1380 if (lbalen->flags & SWS_LBDATA) 1381 scsi_ulto4b(lbalen->lba + lba, buf); 1382 lba++; 1383 } 1384 } 1385 1386 beio->io_offset = lbalen->lba * cbe_lun->blocksize; 1387 beio->io_len = lba * cbe_lun->blocksize; 1388 1389 /* We can not do all in one run. Correct and schedule rerun. */ 1390 if (len_left > 0) { 1391 lbalen->lba += lba; 1392 lbalen->len -= lba; 1393 beio->beio_cont = ctl_be_block_cw_done_ws; 1394 } 1395 1396 be_lun->dispatch(be_lun, beio); 1397 } 1398 1399 static void 1400 ctl_be_block_cw_dispatch_unmap(struct ctl_be_block_lun *be_lun, 1401 union ctl_io *io) 1402 { 1403 struct ctl_be_block_io *beio; 1404 struct ctl_ptr_len_flags *ptrlen; 1405 1406 DPRINTF("entered\n"); 1407 1408 beio = (struct ctl_be_block_io *)PRIV(io)->ptr; 1409 ptrlen = (struct ctl_ptr_len_flags *)&io->io_hdr.ctl_private[CTL_PRIV_LBA_LEN]; 1410 1411 if ((ptrlen->flags & ~SU_ANCHOR) != 0 || be_lun->unmap == NULL) { 1412 ctl_free_beio(beio); 1413 ctl_set_invalid_field(&io->scsiio, 1414 /*sks_valid*/ 0, 1415 /*command*/ 1, 1416 /*field*/ 0, 1417 /*bit_valid*/ 0, 1418 /*bit*/ 0); 1419 ctl_config_write_done(io); 1420 return; 1421 } 1422 1423 beio->io_len = 0; 1424 beio->io_offset = -1; 1425 beio->bio_cmd = BIO_DELETE; 1426 beio->ds_trans_type = DEVSTAT_FREE; 1427 DPRINTF("UNMAP\n"); 1428 be_lun->unmap(be_lun, beio); 1429 } 1430 1431 static void 1432 ctl_be_block_cr_done(struct ctl_be_block_io *beio) 1433 { 1434 union ctl_io *io; 1435 1436 io = beio->io; 1437 ctl_free_beio(beio); 1438 ctl_config_read_done(io); 1439 } 1440 1441 static void 1442 ctl_be_block_cr_dispatch(struct ctl_be_block_lun *be_lun, 1443 union ctl_io *io) 1444 { 1445 struct ctl_be_block_io *beio; 1446 struct ctl_be_block_softc *softc; 1447 1448 DPRINTF("entered\n"); 1449 1450 softc = be_lun->softc; 1451 beio = ctl_alloc_beio(softc); 1452 beio->io = io; 1453 beio->lun = be_lun; 1454 beio->beio_cont = ctl_be_block_cr_done; 1455 PRIV(io)->ptr = (void *)beio; 1456 1457 switch (io->scsiio.cdb[0]) { 1458 case SERVICE_ACTION_IN: /* GET LBA STATUS */ 1459 beio->bio_cmd = -1; 1460 beio->ds_trans_type = DEVSTAT_NO_DATA; 1461 beio->ds_tag_type = DEVSTAT_TAG_ORDERED; 1462 beio->io_len = 0; 1463 if (be_lun->get_lba_status) 1464 be_lun->get_lba_status(be_lun, beio); 1465 else 1466 ctl_be_block_cr_done(beio); 1467 break; 1468 default: 1469 panic("Unhandled CDB type %#x", io->scsiio.cdb[0]); 1470 break; 1471 } 1472 } 1473 1474 static void 1475 ctl_be_block_cw_done(struct ctl_be_block_io *beio) 1476 { 1477 union ctl_io *io; 1478 1479 io = beio->io; 1480 ctl_free_beio(beio); 1481 ctl_config_write_done(io); 1482 } 1483 1484 static void 1485 ctl_be_block_cw_dispatch(struct ctl_be_block_lun *be_lun, 1486 union ctl_io *io) 1487 { 1488 struct ctl_be_block_io *beio; 1489 struct ctl_be_block_softc *softc; 1490 1491 DPRINTF("entered\n"); 1492 1493 softc = be_lun->softc; 1494 beio = ctl_alloc_beio(softc); 1495 beio->io = io; 1496 beio->lun = be_lun; 1497 beio->beio_cont = ctl_be_block_cw_done; 1498 switch (io->scsiio.tag_type) { 1499 case CTL_TAG_ORDERED: 1500 beio->ds_tag_type = DEVSTAT_TAG_ORDERED; 1501 break; 1502 case CTL_TAG_HEAD_OF_QUEUE: 1503 beio->ds_tag_type = DEVSTAT_TAG_HEAD; 1504 break; 1505 case CTL_TAG_UNTAGGED: 1506 case CTL_TAG_SIMPLE: 1507 case CTL_TAG_ACA: 1508 default: 1509 beio->ds_tag_type = DEVSTAT_TAG_SIMPLE; 1510 break; 1511 } 1512 PRIV(io)->ptr = (void *)beio; 1513 1514 switch (io->scsiio.cdb[0]) { 1515 case SYNCHRONIZE_CACHE: 1516 case SYNCHRONIZE_CACHE_16: 1517 ctl_be_block_cw_dispatch_sync(be_lun, io); 1518 break; 1519 case WRITE_SAME_10: 1520 case WRITE_SAME_16: 1521 ctl_be_block_cw_dispatch_ws(be_lun, io); 1522 break; 1523 case UNMAP: 1524 ctl_be_block_cw_dispatch_unmap(be_lun, io); 1525 break; 1526 default: 1527 panic("Unhandled CDB type %#x", io->scsiio.cdb[0]); 1528 break; 1529 } 1530 } 1531 1532 SDT_PROBE_DEFINE1(cbb, , read, start, "uint64_t"); 1533 SDT_PROBE_DEFINE1(cbb, , write, start, "uint64_t"); 1534 SDT_PROBE_DEFINE1(cbb, , read, alloc_done, "uint64_t"); 1535 SDT_PROBE_DEFINE1(cbb, , write, alloc_done, "uint64_t"); 1536 1537 static void 1538 ctl_be_block_next(struct ctl_be_block_io *beio) 1539 { 1540 struct ctl_be_block_lun *be_lun; 1541 union ctl_io *io; 1542 1543 io = beio->io; 1544 be_lun = beio->lun; 1545 ctl_free_beio(beio); 1546 if ((io->io_hdr.flags & CTL_FLAG_ABORT) || 1547 ((io->io_hdr.status & CTL_STATUS_MASK) != CTL_STATUS_NONE && 1548 (io->io_hdr.status & CTL_STATUS_MASK) != CTL_SUCCESS)) { 1549 ctl_data_submit_done(io); 1550 return; 1551 } 1552 1553 io->io_hdr.status &= ~CTL_STATUS_MASK; 1554 io->io_hdr.status |= CTL_STATUS_NONE; 1555 1556 mtx_lock(&be_lun->queue_lock); 1557 STAILQ_INSERT_TAIL(&be_lun->input_queue, &io->io_hdr, links); 1558 mtx_unlock(&be_lun->queue_lock); 1559 taskqueue_enqueue(be_lun->io_taskqueue, &be_lun->io_task); 1560 } 1561 1562 static void 1563 ctl_be_block_dispatch(struct ctl_be_block_lun *be_lun, 1564 union ctl_io *io) 1565 { 1566 struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun; 1567 struct ctl_be_block_io *beio; 1568 struct ctl_be_block_softc *softc; 1569 struct ctl_lba_len_flags *lbalen; 1570 struct ctl_ptr_len_flags *bptrlen; 1571 uint64_t len_left, lbas; 1572 int i; 1573 1574 softc = be_lun->softc; 1575 1576 DPRINTF("entered\n"); 1577 1578 lbalen = ARGS(io); 1579 if (lbalen->flags & CTL_LLF_WRITE) { 1580 SDT_PROBE0(cbb, , write, start); 1581 } else { 1582 SDT_PROBE0(cbb, , read, start); 1583 } 1584 1585 beio = ctl_alloc_beio(softc); 1586 beio->io = io; 1587 beio->lun = be_lun; 1588 bptrlen = PRIV(io); 1589 bptrlen->ptr = (void *)beio; 1590 1591 switch (io->scsiio.tag_type) { 1592 case CTL_TAG_ORDERED: 1593 beio->ds_tag_type = DEVSTAT_TAG_ORDERED; 1594 break; 1595 case CTL_TAG_HEAD_OF_QUEUE: 1596 beio->ds_tag_type = DEVSTAT_TAG_HEAD; 1597 break; 1598 case CTL_TAG_UNTAGGED: 1599 case CTL_TAG_SIMPLE: 1600 case CTL_TAG_ACA: 1601 default: 1602 beio->ds_tag_type = DEVSTAT_TAG_SIMPLE; 1603 break; 1604 } 1605 1606 if (lbalen->flags & CTL_LLF_WRITE) { 1607 beio->bio_cmd = BIO_WRITE; 1608 beio->ds_trans_type = DEVSTAT_WRITE; 1609 } else { 1610 beio->bio_cmd = BIO_READ; 1611 beio->ds_trans_type = DEVSTAT_READ; 1612 } 1613 1614 DPRINTF("%s at LBA %jx len %u @%ju\n", 1615 (beio->bio_cmd == BIO_READ) ? "READ" : "WRITE", 1616 (uintmax_t)lbalen->lba, lbalen->len, bptrlen->len); 1617 if (lbalen->flags & CTL_LLF_COMPARE) { 1618 beio->two_sglists = 1; 1619 lbas = CTLBLK_HALF_IO_SIZE; 1620 } else { 1621 lbas = CTLBLK_MAX_IO_SIZE; 1622 } 1623 lbas = MIN(lbalen->len - bptrlen->len, lbas / cbe_lun->blocksize); 1624 beio->io_offset = (lbalen->lba + bptrlen->len) * cbe_lun->blocksize; 1625 beio->io_len = lbas * cbe_lun->blocksize; 1626 bptrlen->len += lbas; 1627 1628 for (i = 0, len_left = beio->io_len; len_left > 0; i++) { 1629 KASSERT(i < CTLBLK_MAX_SEGS, ("Too many segs (%d >= %d)", 1630 i, CTLBLK_MAX_SEGS)); 1631 1632 /* 1633 * Setup the S/G entry for this chunk. 1634 */ 1635 ctl_alloc_seg(softc, &beio->sg_segs[i], 1636 MIN(CTLBLK_MAX_SEG, len_left)); 1637 1638 DPRINTF("segment %d addr %p len %zd\n", i, 1639 beio->sg_segs[i].addr, beio->sg_segs[i].len); 1640 1641 /* Set up second segment for compare operation. */ 1642 if (beio->two_sglists) { 1643 ctl_alloc_seg(softc, 1644 &beio->sg_segs[i + CTLBLK_HALF_SEGS], 1645 beio->sg_segs[i].len); 1646 } 1647 1648 beio->num_segs++; 1649 len_left -= beio->sg_segs[i].len; 1650 } 1651 if (bptrlen->len < lbalen->len) 1652 beio->beio_cont = ctl_be_block_next; 1653 io->scsiio.be_move_done = ctl_be_block_move_done; 1654 /* For compare we have separate S/G lists for read and datamove. */ 1655 if (beio->two_sglists) 1656 io->scsiio.kern_data_ptr = (uint8_t *)&beio->sg_segs[CTLBLK_HALF_SEGS]; 1657 else 1658 io->scsiio.kern_data_ptr = (uint8_t *)beio->sg_segs; 1659 io->scsiio.kern_data_len = beio->io_len; 1660 io->scsiio.kern_sg_entries = beio->num_segs; 1661 io->scsiio.kern_data_ref = ctl_refcnt_beio; 1662 io->scsiio.kern_data_arg = beio; 1663 io->io_hdr.flags |= CTL_FLAG_ALLOCATED; 1664 1665 /* 1666 * For the read case, we need to read the data into our buffers and 1667 * then we can send it back to the user. For the write case, we 1668 * need to get the data from the user first. 1669 */ 1670 if (beio->bio_cmd == BIO_READ) { 1671 SDT_PROBE0(cbb, , read, alloc_done); 1672 be_lun->dispatch(be_lun, beio); 1673 } else { 1674 SDT_PROBE0(cbb, , write, alloc_done); 1675 #ifdef CTL_TIME_IO 1676 getbinuptime(&io->io_hdr.dma_start_bt); 1677 #endif 1678 ctl_datamove(io); 1679 } 1680 } 1681 1682 static void 1683 ctl_be_block_worker(void *context, int pending) 1684 { 1685 struct ctl_be_block_lun *be_lun = (struct ctl_be_block_lun *)context; 1686 struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun; 1687 union ctl_io *io; 1688 struct ctl_be_block_io *beio; 1689 1690 DPRINTF("entered\n"); 1691 /* 1692 * Fetch and process I/Os from all queues. If we detect LUN 1693 * CTL_LUN_FLAG_NO_MEDIA status here -- it is result of a race, 1694 * so make response maximally opaque to not confuse initiator. 1695 */ 1696 for (;;) { 1697 mtx_lock(&be_lun->queue_lock); 1698 io = (union ctl_io *)STAILQ_FIRST(&be_lun->datamove_queue); 1699 if (io != NULL) { 1700 DPRINTF("datamove queue\n"); 1701 STAILQ_REMOVE(&be_lun->datamove_queue, &io->io_hdr, 1702 ctl_io_hdr, links); 1703 mtx_unlock(&be_lun->queue_lock); 1704 beio = (struct ctl_be_block_io *)PRIV(io)->ptr; 1705 if (cbe_lun->flags & CTL_LUN_FLAG_NO_MEDIA) { 1706 ctl_set_busy(&io->scsiio); 1707 ctl_complete_beio(beio); 1708 return; 1709 } 1710 be_lun->dispatch(be_lun, beio); 1711 continue; 1712 } 1713 io = (union ctl_io *)STAILQ_FIRST(&be_lun->config_write_queue); 1714 if (io != NULL) { 1715 DPRINTF("config write queue\n"); 1716 STAILQ_REMOVE(&be_lun->config_write_queue, &io->io_hdr, 1717 ctl_io_hdr, links); 1718 mtx_unlock(&be_lun->queue_lock); 1719 if (cbe_lun->flags & CTL_LUN_FLAG_NO_MEDIA) { 1720 ctl_set_busy(&io->scsiio); 1721 ctl_config_write_done(io); 1722 return; 1723 } 1724 ctl_be_block_cw_dispatch(be_lun, io); 1725 continue; 1726 } 1727 io = (union ctl_io *)STAILQ_FIRST(&be_lun->config_read_queue); 1728 if (io != NULL) { 1729 DPRINTF("config read queue\n"); 1730 STAILQ_REMOVE(&be_lun->config_read_queue, &io->io_hdr, 1731 ctl_io_hdr, links); 1732 mtx_unlock(&be_lun->queue_lock); 1733 if (cbe_lun->flags & CTL_LUN_FLAG_NO_MEDIA) { 1734 ctl_set_busy(&io->scsiio); 1735 ctl_config_read_done(io); 1736 return; 1737 } 1738 ctl_be_block_cr_dispatch(be_lun, io); 1739 continue; 1740 } 1741 io = (union ctl_io *)STAILQ_FIRST(&be_lun->input_queue); 1742 if (io != NULL) { 1743 DPRINTF("input queue\n"); 1744 STAILQ_REMOVE(&be_lun->input_queue, &io->io_hdr, 1745 ctl_io_hdr, links); 1746 mtx_unlock(&be_lun->queue_lock); 1747 if (cbe_lun->flags & CTL_LUN_FLAG_NO_MEDIA) { 1748 ctl_set_busy(&io->scsiio); 1749 ctl_data_submit_done(io); 1750 return; 1751 } 1752 ctl_be_block_dispatch(be_lun, io); 1753 continue; 1754 } 1755 1756 /* 1757 * If we get here, there is no work left in the queues, so 1758 * just break out and let the task queue go to sleep. 1759 */ 1760 mtx_unlock(&be_lun->queue_lock); 1761 break; 1762 } 1763 } 1764 1765 /* 1766 * Entry point from CTL to the backend for I/O. We queue everything to a 1767 * work thread, so this just puts the I/O on a queue and wakes up the 1768 * thread. 1769 */ 1770 static int 1771 ctl_be_block_submit(union ctl_io *io) 1772 { 1773 struct ctl_be_block_lun *be_lun; 1774 1775 DPRINTF("entered\n"); 1776 1777 be_lun = (struct ctl_be_block_lun *)CTL_BACKEND_LUN(io); 1778 1779 /* 1780 * Make sure we only get SCSI I/O. 1781 */ 1782 KASSERT(io->io_hdr.io_type == CTL_IO_SCSI, ("Non-SCSI I/O (type " 1783 "%#x) encountered", io->io_hdr.io_type)); 1784 1785 PRIV(io)->len = 0; 1786 1787 mtx_lock(&be_lun->queue_lock); 1788 STAILQ_INSERT_TAIL(&be_lun->input_queue, &io->io_hdr, links); 1789 mtx_unlock(&be_lun->queue_lock); 1790 taskqueue_enqueue(be_lun->io_taskqueue, &be_lun->io_task); 1791 1792 return (CTL_RETVAL_COMPLETE); 1793 } 1794 1795 static int 1796 ctl_be_block_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, 1797 int flag, struct thread *td) 1798 { 1799 struct ctl_be_block_softc *softc = &backend_block_softc; 1800 int error; 1801 1802 error = 0; 1803 switch (cmd) { 1804 case CTL_LUN_REQ: { 1805 struct ctl_lun_req *lun_req; 1806 1807 lun_req = (struct ctl_lun_req *)addr; 1808 1809 switch (lun_req->reqtype) { 1810 case CTL_LUNREQ_CREATE: 1811 error = ctl_be_block_create(softc, lun_req); 1812 break; 1813 case CTL_LUNREQ_RM: 1814 error = ctl_be_block_rm(softc, lun_req); 1815 break; 1816 case CTL_LUNREQ_MODIFY: 1817 error = ctl_be_block_modify(softc, lun_req); 1818 break; 1819 default: 1820 lun_req->status = CTL_LUN_ERROR; 1821 snprintf(lun_req->error_str, sizeof(lun_req->error_str), 1822 "invalid LUN request type %d", 1823 lun_req->reqtype); 1824 break; 1825 } 1826 break; 1827 } 1828 default: 1829 error = ENOTTY; 1830 break; 1831 } 1832 1833 return (error); 1834 } 1835 1836 static int 1837 ctl_be_block_open_file(struct ctl_be_block_lun *be_lun, struct ctl_lun_req *req) 1838 { 1839 struct ctl_be_lun *cbe_lun; 1840 struct ctl_be_block_filedata *file_data; 1841 struct ctl_lun_create_params *params; 1842 const char *value; 1843 struct vattr vattr; 1844 off_t ps, pss, po, pos, us, uss, uo, uos; 1845 int error; 1846 1847 cbe_lun = &be_lun->cbe_lun; 1848 file_data = &be_lun->backend.file; 1849 params = &be_lun->params; 1850 1851 be_lun->dev_type = CTL_BE_BLOCK_FILE; 1852 be_lun->dispatch = ctl_be_block_dispatch_file; 1853 be_lun->lun_flush = ctl_be_block_flush_file; 1854 be_lun->get_lba_status = ctl_be_block_gls_file; 1855 be_lun->getattr = ctl_be_block_getattr_file; 1856 be_lun->unmap = NULL; 1857 cbe_lun->flags &= ~CTL_LUN_FLAG_UNMAP; 1858 1859 error = VOP_GETATTR(be_lun->vn, &vattr, curthread->td_ucred); 1860 if (error != 0) { 1861 snprintf(req->error_str, sizeof(req->error_str), 1862 "error calling VOP_GETATTR() for file %s", 1863 be_lun->dev_path); 1864 return (error); 1865 } 1866 1867 file_data->cred = crhold(curthread->td_ucred); 1868 if (params->lun_size_bytes != 0) 1869 be_lun->size_bytes = params->lun_size_bytes; 1870 else 1871 be_lun->size_bytes = vattr.va_size; 1872 1873 /* 1874 * For files we can use any logical block size. Prefer 512 bytes 1875 * for compatibility reasons. If file's vattr.va_blocksize 1876 * (preferred I/O block size) is bigger and multiple to chosen 1877 * logical block size -- report it as physical block size. 1878 */ 1879 if (params->blocksize_bytes != 0) 1880 cbe_lun->blocksize = params->blocksize_bytes; 1881 else if (cbe_lun->lun_type == T_CDROM) 1882 cbe_lun->blocksize = 2048; 1883 else 1884 cbe_lun->blocksize = 512; 1885 be_lun->size_blocks = be_lun->size_bytes / cbe_lun->blocksize; 1886 cbe_lun->maxlba = (be_lun->size_blocks == 0) ? 1887 0 : (be_lun->size_blocks - 1); 1888 1889 us = ps = vattr.va_blocksize; 1890 uo = po = 0; 1891 1892 value = dnvlist_get_string(cbe_lun->options, "pblocksize", NULL); 1893 if (value != NULL) 1894 ctl_expand_number(value, &ps); 1895 value = dnvlist_get_string(cbe_lun->options, "pblockoffset", NULL); 1896 if (value != NULL) 1897 ctl_expand_number(value, &po); 1898 pss = ps / cbe_lun->blocksize; 1899 pos = po / cbe_lun->blocksize; 1900 if ((pss > 0) && (pss * cbe_lun->blocksize == ps) && (pss >= pos) && 1901 ((pss & (pss - 1)) == 0) && (pos * cbe_lun->blocksize == po)) { 1902 cbe_lun->pblockexp = fls(pss) - 1; 1903 cbe_lun->pblockoff = (pss - pos) % pss; 1904 } 1905 1906 value = dnvlist_get_string(cbe_lun->options, "ublocksize", NULL); 1907 if (value != NULL) 1908 ctl_expand_number(value, &us); 1909 value = dnvlist_get_string(cbe_lun->options, "ublockoffset", NULL); 1910 if (value != NULL) 1911 ctl_expand_number(value, &uo); 1912 uss = us / cbe_lun->blocksize; 1913 uos = uo / cbe_lun->blocksize; 1914 if ((uss > 0) && (uss * cbe_lun->blocksize == us) && (uss >= uos) && 1915 ((uss & (uss - 1)) == 0) && (uos * cbe_lun->blocksize == uo)) { 1916 cbe_lun->ublockexp = fls(uss) - 1; 1917 cbe_lun->ublockoff = (uss - uos) % uss; 1918 } 1919 1920 /* 1921 * Sanity check. The media size has to be at least one 1922 * sector long. 1923 */ 1924 if (be_lun->size_bytes < cbe_lun->blocksize) { 1925 error = EINVAL; 1926 snprintf(req->error_str, sizeof(req->error_str), 1927 "file %s size %ju < block size %u", be_lun->dev_path, 1928 (uintmax_t)be_lun->size_bytes, cbe_lun->blocksize); 1929 } 1930 1931 cbe_lun->opttxferlen = CTLBLK_MAX_IO_SIZE / cbe_lun->blocksize; 1932 return (error); 1933 } 1934 1935 static int 1936 ctl_be_block_open_dev(struct ctl_be_block_lun *be_lun, struct ctl_lun_req *req) 1937 { 1938 struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun; 1939 struct ctl_lun_create_params *params; 1940 struct cdevsw *csw; 1941 struct cdev *dev; 1942 const char *value; 1943 int error, atomic, maxio, ref, unmap, tmp; 1944 off_t ps, pss, po, pos, us, uss, uo, uos, otmp; 1945 1946 params = &be_lun->params; 1947 1948 be_lun->dev_type = CTL_BE_BLOCK_DEV; 1949 csw = devvn_refthread(be_lun->vn, &dev, &ref); 1950 if (csw == NULL) 1951 return (ENXIO); 1952 if (strcmp(csw->d_name, "zvol") == 0) { 1953 be_lun->dispatch = ctl_be_block_dispatch_zvol; 1954 be_lun->get_lba_status = ctl_be_block_gls_zvol; 1955 atomic = maxio = CTLBLK_MAX_IO_SIZE; 1956 } else { 1957 be_lun->dispatch = ctl_be_block_dispatch_dev; 1958 be_lun->get_lba_status = NULL; 1959 atomic = 0; 1960 maxio = dev->si_iosize_max; 1961 if (maxio <= 0) 1962 maxio = DFLTPHYS; 1963 if (maxio > CTLBLK_MAX_SEG) 1964 maxio = CTLBLK_MAX_SEG; 1965 } 1966 be_lun->lun_flush = ctl_be_block_flush_dev; 1967 be_lun->getattr = ctl_be_block_getattr_dev; 1968 be_lun->unmap = ctl_be_block_unmap_dev; 1969 1970 if (!csw->d_ioctl) { 1971 dev_relthread(dev, ref); 1972 snprintf(req->error_str, sizeof(req->error_str), 1973 "no d_ioctl for device %s!", be_lun->dev_path); 1974 return (ENODEV); 1975 } 1976 1977 error = csw->d_ioctl(dev, DIOCGSECTORSIZE, (caddr_t)&tmp, FREAD, 1978 curthread); 1979 if (error) { 1980 dev_relthread(dev, ref); 1981 snprintf(req->error_str, sizeof(req->error_str), 1982 "error %d returned for DIOCGSECTORSIZE ioctl " 1983 "on %s!", error, be_lun->dev_path); 1984 return (error); 1985 } 1986 1987 /* 1988 * If the user has asked for a blocksize that is greater than the 1989 * backing device's blocksize, we can do it only if the blocksize 1990 * the user is asking for is an even multiple of the underlying 1991 * device's blocksize. 1992 */ 1993 if ((params->blocksize_bytes != 0) && 1994 (params->blocksize_bytes >= tmp)) { 1995 if (params->blocksize_bytes % tmp == 0) { 1996 cbe_lun->blocksize = params->blocksize_bytes; 1997 } else { 1998 dev_relthread(dev, ref); 1999 snprintf(req->error_str, sizeof(req->error_str), 2000 "requested blocksize %u is not an even " 2001 "multiple of backing device blocksize %u", 2002 params->blocksize_bytes, tmp); 2003 return (EINVAL); 2004 } 2005 } else if (params->blocksize_bytes != 0) { 2006 dev_relthread(dev, ref); 2007 snprintf(req->error_str, sizeof(req->error_str), 2008 "requested blocksize %u < backing device " 2009 "blocksize %u", params->blocksize_bytes, tmp); 2010 return (EINVAL); 2011 } else if (cbe_lun->lun_type == T_CDROM) 2012 cbe_lun->blocksize = MAX(tmp, 2048); 2013 else 2014 cbe_lun->blocksize = tmp; 2015 2016 error = csw->d_ioctl(dev, DIOCGMEDIASIZE, (caddr_t)&otmp, FREAD, 2017 curthread); 2018 if (error) { 2019 dev_relthread(dev, ref); 2020 snprintf(req->error_str, sizeof(req->error_str), 2021 "error %d returned for DIOCGMEDIASIZE " 2022 " ioctl on %s!", error, 2023 be_lun->dev_path); 2024 return (error); 2025 } 2026 2027 if (params->lun_size_bytes != 0) { 2028 if (params->lun_size_bytes > otmp) { 2029 dev_relthread(dev, ref); 2030 snprintf(req->error_str, sizeof(req->error_str), 2031 "requested LUN size %ju > backing device " 2032 "size %ju", 2033 (uintmax_t)params->lun_size_bytes, 2034 (uintmax_t)otmp); 2035 return (EINVAL); 2036 } 2037 2038 be_lun->size_bytes = params->lun_size_bytes; 2039 } else 2040 be_lun->size_bytes = otmp; 2041 be_lun->size_blocks = be_lun->size_bytes / cbe_lun->blocksize; 2042 cbe_lun->maxlba = (be_lun->size_blocks == 0) ? 2043 0 : (be_lun->size_blocks - 1); 2044 2045 error = csw->d_ioctl(dev, DIOCGSTRIPESIZE, (caddr_t)&ps, FREAD, 2046 curthread); 2047 if (error) 2048 ps = po = 0; 2049 else { 2050 error = csw->d_ioctl(dev, DIOCGSTRIPEOFFSET, (caddr_t)&po, 2051 FREAD, curthread); 2052 if (error) 2053 po = 0; 2054 } 2055 us = ps; 2056 uo = po; 2057 2058 value = dnvlist_get_string(cbe_lun->options, "pblocksize", NULL); 2059 if (value != NULL) 2060 ctl_expand_number(value, &ps); 2061 value = dnvlist_get_string(cbe_lun->options, "pblockoffset", NULL); 2062 if (value != NULL) 2063 ctl_expand_number(value, &po); 2064 pss = ps / cbe_lun->blocksize; 2065 pos = po / cbe_lun->blocksize; 2066 if ((pss > 0) && (pss * cbe_lun->blocksize == ps) && (pss >= pos) && 2067 ((pss & (pss - 1)) == 0) && (pos * cbe_lun->blocksize == po)) { 2068 cbe_lun->pblockexp = fls(pss) - 1; 2069 cbe_lun->pblockoff = (pss - pos) % pss; 2070 } 2071 2072 value = dnvlist_get_string(cbe_lun->options, "ublocksize", NULL); 2073 if (value != NULL) 2074 ctl_expand_number(value, &us); 2075 value = dnvlist_get_string(cbe_lun->options, "ublockoffset", NULL); 2076 if (value != NULL) 2077 ctl_expand_number(value, &uo); 2078 uss = us / cbe_lun->blocksize; 2079 uos = uo / cbe_lun->blocksize; 2080 if ((uss > 0) && (uss * cbe_lun->blocksize == us) && (uss >= uos) && 2081 ((uss & (uss - 1)) == 0) && (uos * cbe_lun->blocksize == uo)) { 2082 cbe_lun->ublockexp = fls(uss) - 1; 2083 cbe_lun->ublockoff = (uss - uos) % uss; 2084 } 2085 2086 cbe_lun->atomicblock = atomic / cbe_lun->blocksize; 2087 cbe_lun->opttxferlen = maxio / cbe_lun->blocksize; 2088 2089 if (be_lun->dispatch == ctl_be_block_dispatch_zvol) { 2090 unmap = 1; 2091 } else { 2092 struct diocgattr_arg arg; 2093 2094 strlcpy(arg.name, "GEOM::candelete", sizeof(arg.name)); 2095 arg.len = sizeof(arg.value.i); 2096 error = csw->d_ioctl(dev, DIOCGATTR, (caddr_t)&arg, FREAD, 2097 curthread); 2098 unmap = (error == 0) ? arg.value.i : 0; 2099 } 2100 value = dnvlist_get_string(cbe_lun->options, "unmap", NULL); 2101 if (value != NULL) 2102 unmap = (strcmp(value, "on") == 0); 2103 if (unmap) 2104 cbe_lun->flags |= CTL_LUN_FLAG_UNMAP; 2105 else 2106 cbe_lun->flags &= ~CTL_LUN_FLAG_UNMAP; 2107 2108 dev_relthread(dev, ref); 2109 return (0); 2110 } 2111 2112 static int 2113 ctl_be_block_close(struct ctl_be_block_lun *be_lun) 2114 { 2115 struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun; 2116 int flags; 2117 2118 if (be_lun->vn) { 2119 flags = FREAD; 2120 if ((cbe_lun->flags & CTL_LUN_FLAG_READONLY) == 0) 2121 flags |= FWRITE; 2122 (void)vn_close(be_lun->vn, flags, NOCRED, curthread); 2123 be_lun->vn = NULL; 2124 2125 switch (be_lun->dev_type) { 2126 case CTL_BE_BLOCK_DEV: 2127 break; 2128 case CTL_BE_BLOCK_FILE: 2129 if (be_lun->backend.file.cred != NULL) { 2130 crfree(be_lun->backend.file.cred); 2131 be_lun->backend.file.cred = NULL; 2132 } 2133 break; 2134 case CTL_BE_BLOCK_NONE: 2135 break; 2136 default: 2137 panic("Unexpected backend type %d", be_lun->dev_type); 2138 break; 2139 } 2140 be_lun->dev_type = CTL_BE_BLOCK_NONE; 2141 } 2142 return (0); 2143 } 2144 2145 static int 2146 ctl_be_block_open(struct ctl_be_block_lun *be_lun, struct ctl_lun_req *req) 2147 { 2148 struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun; 2149 struct nameidata nd; 2150 const char *value; 2151 int error, flags; 2152 2153 error = 0; 2154 if (rootvnode == NULL) { 2155 snprintf(req->error_str, sizeof(req->error_str), 2156 "Root filesystem is not mounted"); 2157 return (1); 2158 } 2159 pwd_ensure_dirs(); 2160 2161 value = dnvlist_get_string(cbe_lun->options, "file", NULL); 2162 if (value == NULL) { 2163 snprintf(req->error_str, sizeof(req->error_str), 2164 "no file argument specified"); 2165 return (1); 2166 } 2167 free(be_lun->dev_path, M_CTLBLK); 2168 be_lun->dev_path = strdup(value, M_CTLBLK); 2169 2170 flags = FREAD; 2171 value = dnvlist_get_string(cbe_lun->options, "readonly", NULL); 2172 if (value != NULL) { 2173 if (strcmp(value, "on") != 0) 2174 flags |= FWRITE; 2175 } else if (cbe_lun->lun_type == T_DIRECT) 2176 flags |= FWRITE; 2177 2178 again: 2179 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, be_lun->dev_path, curthread); 2180 error = vn_open(&nd, &flags, 0, NULL); 2181 if ((error == EROFS || error == EACCES) && (flags & FWRITE)) { 2182 flags &= ~FWRITE; 2183 goto again; 2184 } 2185 if (error) { 2186 /* 2187 * This is the only reasonable guess we can make as far as 2188 * path if the user doesn't give us a fully qualified path. 2189 * If they want to specify a file, they need to specify the 2190 * full path. 2191 */ 2192 if (be_lun->dev_path[0] != '/') { 2193 char *dev_name; 2194 2195 asprintf(&dev_name, M_CTLBLK, "/dev/%s", 2196 be_lun->dev_path); 2197 free(be_lun->dev_path, M_CTLBLK); 2198 be_lun->dev_path = dev_name; 2199 goto again; 2200 } 2201 snprintf(req->error_str, sizeof(req->error_str), 2202 "error opening %s: %d", be_lun->dev_path, error); 2203 return (error); 2204 } 2205 if (flags & FWRITE) 2206 cbe_lun->flags &= ~CTL_LUN_FLAG_READONLY; 2207 else 2208 cbe_lun->flags |= CTL_LUN_FLAG_READONLY; 2209 2210 NDFREE(&nd, NDF_ONLY_PNBUF); 2211 be_lun->vn = nd.ni_vp; 2212 2213 /* We only support disks and files. */ 2214 if (vn_isdisk_error(be_lun->vn, &error)) { 2215 error = ctl_be_block_open_dev(be_lun, req); 2216 } else if (be_lun->vn->v_type == VREG) { 2217 error = ctl_be_block_open_file(be_lun, req); 2218 } else { 2219 error = EINVAL; 2220 snprintf(req->error_str, sizeof(req->error_str), 2221 "%s is not a disk or plain file", be_lun->dev_path); 2222 } 2223 VOP_UNLOCK(be_lun->vn); 2224 2225 if (error != 0) 2226 ctl_be_block_close(be_lun); 2227 cbe_lun->serseq = CTL_LUN_SERSEQ_OFF; 2228 if (be_lun->dispatch != ctl_be_block_dispatch_dev) 2229 cbe_lun->serseq = CTL_LUN_SERSEQ_READ; 2230 value = dnvlist_get_string(cbe_lun->options, "serseq", NULL); 2231 if (value != NULL && strcmp(value, "on") == 0) 2232 cbe_lun->serseq = CTL_LUN_SERSEQ_ON; 2233 else if (value != NULL && strcmp(value, "read") == 0) 2234 cbe_lun->serseq = CTL_LUN_SERSEQ_READ; 2235 else if (value != NULL && strcmp(value, "off") == 0) 2236 cbe_lun->serseq = CTL_LUN_SERSEQ_OFF; 2237 return (0); 2238 } 2239 2240 static int 2241 ctl_be_block_create(struct ctl_be_block_softc *softc, struct ctl_lun_req *req) 2242 { 2243 struct ctl_be_lun *cbe_lun; 2244 struct ctl_be_block_lun *be_lun; 2245 struct ctl_lun_create_params *params; 2246 char num_thread_str[16]; 2247 char tmpstr[32]; 2248 const char *value; 2249 int retval, num_threads; 2250 int tmp_num_threads; 2251 2252 params = &req->reqdata.create; 2253 retval = 0; 2254 req->status = CTL_LUN_OK; 2255 2256 be_lun = malloc(sizeof(*be_lun), M_CTLBLK, M_ZERO | M_WAITOK); 2257 cbe_lun = &be_lun->cbe_lun; 2258 be_lun->params = req->reqdata.create; 2259 be_lun->softc = softc; 2260 STAILQ_INIT(&be_lun->input_queue); 2261 STAILQ_INIT(&be_lun->config_read_queue); 2262 STAILQ_INIT(&be_lun->config_write_queue); 2263 STAILQ_INIT(&be_lun->datamove_queue); 2264 mtx_init(&be_lun->io_lock, "ctlblock io", NULL, MTX_DEF); 2265 mtx_init(&be_lun->queue_lock, "ctlblock queue", NULL, MTX_DEF); 2266 cbe_lun->options = nvlist_clone(req->args_nvl); 2267 2268 if (params->flags & CTL_LUN_FLAG_DEV_TYPE) 2269 cbe_lun->lun_type = params->device_type; 2270 else 2271 cbe_lun->lun_type = T_DIRECT; 2272 be_lun->flags = 0; 2273 cbe_lun->flags = 0; 2274 value = dnvlist_get_string(cbe_lun->options, "ha_role", NULL); 2275 if (value != NULL) { 2276 if (strcmp(value, "primary") == 0) 2277 cbe_lun->flags |= CTL_LUN_FLAG_PRIMARY; 2278 } else if (control_softc->flags & CTL_FLAG_ACTIVE_SHELF) 2279 cbe_lun->flags |= CTL_LUN_FLAG_PRIMARY; 2280 2281 if (cbe_lun->lun_type == T_DIRECT || 2282 cbe_lun->lun_type == T_CDROM) { 2283 be_lun->size_bytes = params->lun_size_bytes; 2284 if (params->blocksize_bytes != 0) 2285 cbe_lun->blocksize = params->blocksize_bytes; 2286 else if (cbe_lun->lun_type == T_CDROM) 2287 cbe_lun->blocksize = 2048; 2288 else 2289 cbe_lun->blocksize = 512; 2290 be_lun->size_blocks = be_lun->size_bytes / cbe_lun->blocksize; 2291 cbe_lun->maxlba = (be_lun->size_blocks == 0) ? 2292 0 : (be_lun->size_blocks - 1); 2293 2294 if ((cbe_lun->flags & CTL_LUN_FLAG_PRIMARY) || 2295 control_softc->ha_mode == CTL_HA_MODE_SER_ONLY) { 2296 retval = ctl_be_block_open(be_lun, req); 2297 if (retval != 0) { 2298 retval = 0; 2299 req->status = CTL_LUN_WARNING; 2300 } 2301 } 2302 num_threads = cbb_num_threads; 2303 } else { 2304 num_threads = 1; 2305 } 2306 2307 value = dnvlist_get_string(cbe_lun->options, "num_threads", NULL); 2308 if (value != NULL) { 2309 tmp_num_threads = strtol(value, NULL, 0); 2310 2311 /* 2312 * We don't let the user specify less than one 2313 * thread, but hope he's clueful enough not to 2314 * specify 1000 threads. 2315 */ 2316 if (tmp_num_threads < 1) { 2317 snprintf(req->error_str, sizeof(req->error_str), 2318 "invalid number of threads %s", 2319 num_thread_str); 2320 goto bailout_error; 2321 } 2322 num_threads = tmp_num_threads; 2323 } 2324 2325 if (be_lun->vn == NULL) 2326 cbe_lun->flags |= CTL_LUN_FLAG_NO_MEDIA; 2327 /* Tell the user the blocksize we ended up using */ 2328 params->lun_size_bytes = be_lun->size_bytes; 2329 params->blocksize_bytes = cbe_lun->blocksize; 2330 if (params->flags & CTL_LUN_FLAG_ID_REQ) { 2331 cbe_lun->req_lun_id = params->req_lun_id; 2332 cbe_lun->flags |= CTL_LUN_FLAG_ID_REQ; 2333 } else 2334 cbe_lun->req_lun_id = 0; 2335 2336 cbe_lun->lun_shutdown = ctl_be_block_lun_shutdown; 2337 cbe_lun->be = &ctl_be_block_driver; 2338 2339 if ((params->flags & CTL_LUN_FLAG_SERIAL_NUM) == 0) { 2340 snprintf(tmpstr, sizeof(tmpstr), "MYSERIAL%04d", 2341 softc->num_luns); 2342 strncpy((char *)cbe_lun->serial_num, tmpstr, 2343 MIN(sizeof(cbe_lun->serial_num), sizeof(tmpstr))); 2344 2345 /* Tell the user what we used for a serial number */ 2346 strncpy((char *)params->serial_num, tmpstr, 2347 MIN(sizeof(params->serial_num), sizeof(tmpstr))); 2348 } else { 2349 strncpy((char *)cbe_lun->serial_num, params->serial_num, 2350 MIN(sizeof(cbe_lun->serial_num), 2351 sizeof(params->serial_num))); 2352 } 2353 if ((params->flags & CTL_LUN_FLAG_DEVID) == 0) { 2354 snprintf(tmpstr, sizeof(tmpstr), "MYDEVID%04d", softc->num_luns); 2355 strncpy((char *)cbe_lun->device_id, tmpstr, 2356 MIN(sizeof(cbe_lun->device_id), sizeof(tmpstr))); 2357 2358 /* Tell the user what we used for a device ID */ 2359 strncpy((char *)params->device_id, tmpstr, 2360 MIN(sizeof(params->device_id), sizeof(tmpstr))); 2361 } else { 2362 strncpy((char *)cbe_lun->device_id, params->device_id, 2363 MIN(sizeof(cbe_lun->device_id), 2364 sizeof(params->device_id))); 2365 } 2366 2367 TASK_INIT(&be_lun->io_task, /*priority*/0, ctl_be_block_worker, be_lun); 2368 2369 be_lun->io_taskqueue = taskqueue_create("ctlblocktq", M_WAITOK, 2370 taskqueue_thread_enqueue, /*context*/&be_lun->io_taskqueue); 2371 2372 if (be_lun->io_taskqueue == NULL) { 2373 snprintf(req->error_str, sizeof(req->error_str), 2374 "unable to create taskqueue"); 2375 goto bailout_error; 2376 } 2377 2378 /* 2379 * Note that we start the same number of threads by default for 2380 * both the file case and the block device case. For the file 2381 * case, we need multiple threads to allow concurrency, because the 2382 * vnode interface is designed to be a blocking interface. For the 2383 * block device case, ZFS zvols at least will block the caller's 2384 * context in many instances, and so we need multiple threads to 2385 * overcome that problem. Other block devices don't need as many 2386 * threads, but they shouldn't cause too many problems. 2387 * 2388 * If the user wants to just have a single thread for a block 2389 * device, he can specify that when the LUN is created, or change 2390 * the tunable/sysctl to alter the default number of threads. 2391 */ 2392 retval = taskqueue_start_threads_in_proc(&be_lun->io_taskqueue, 2393 /*num threads*/num_threads, 2394 /*priority*/PUSER, 2395 /*proc*/control_softc->ctl_proc, 2396 /*thread name*/"block"); 2397 2398 if (retval != 0) 2399 goto bailout_error; 2400 2401 be_lun->num_threads = num_threads; 2402 2403 retval = ctl_add_lun(&be_lun->cbe_lun); 2404 if (retval != 0) { 2405 snprintf(req->error_str, sizeof(req->error_str), 2406 "ctl_add_lun() returned error %d, see dmesg for " 2407 "details", retval); 2408 retval = 0; 2409 goto bailout_error; 2410 } 2411 2412 be_lun->disk_stats = devstat_new_entry("cbb", cbe_lun->lun_id, 2413 cbe_lun->blocksize, 2414 DEVSTAT_ALL_SUPPORTED, 2415 cbe_lun->lun_type 2416 | DEVSTAT_TYPE_IF_OTHER, 2417 DEVSTAT_PRIORITY_OTHER); 2418 2419 mtx_lock(&softc->lock); 2420 softc->num_luns++; 2421 SLIST_INSERT_HEAD(&softc->lun_list, be_lun, links); 2422 mtx_unlock(&softc->lock); 2423 2424 params->req_lun_id = cbe_lun->lun_id; 2425 2426 return (retval); 2427 2428 bailout_error: 2429 req->status = CTL_LUN_ERROR; 2430 2431 if (be_lun->io_taskqueue != NULL) 2432 taskqueue_free(be_lun->io_taskqueue); 2433 ctl_be_block_close(be_lun); 2434 if (be_lun->dev_path != NULL) 2435 free(be_lun->dev_path, M_CTLBLK); 2436 nvlist_destroy(cbe_lun->options); 2437 mtx_destroy(&be_lun->queue_lock); 2438 mtx_destroy(&be_lun->io_lock); 2439 free(be_lun, M_CTLBLK); 2440 2441 return (retval); 2442 } 2443 2444 static int 2445 ctl_be_block_rm(struct ctl_be_block_softc *softc, struct ctl_lun_req *req) 2446 { 2447 struct ctl_lun_rm_params *params; 2448 struct ctl_be_block_lun *be_lun; 2449 struct ctl_be_lun *cbe_lun; 2450 int retval; 2451 2452 params = &req->reqdata.rm; 2453 2454 sx_xlock(&softc->modify_lock); 2455 mtx_lock(&softc->lock); 2456 SLIST_FOREACH(be_lun, &softc->lun_list, links) { 2457 if (be_lun->cbe_lun.lun_id == params->lun_id) { 2458 SLIST_REMOVE(&softc->lun_list, be_lun, 2459 ctl_be_block_lun, links); 2460 softc->num_luns--; 2461 break; 2462 } 2463 } 2464 mtx_unlock(&softc->lock); 2465 sx_xunlock(&softc->modify_lock); 2466 if (be_lun == NULL) { 2467 snprintf(req->error_str, sizeof(req->error_str), 2468 "LUN %u is not managed by the block backend", 2469 params->lun_id); 2470 goto bailout_error; 2471 } 2472 cbe_lun = &be_lun->cbe_lun; 2473 2474 if (be_lun->vn != NULL) { 2475 cbe_lun->flags |= CTL_LUN_FLAG_NO_MEDIA; 2476 ctl_lun_no_media(cbe_lun); 2477 taskqueue_drain_all(be_lun->io_taskqueue); 2478 ctl_be_block_close(be_lun); 2479 } 2480 2481 mtx_lock(&softc->lock); 2482 be_lun->flags |= CTL_BE_BLOCK_LUN_WAITING; 2483 mtx_unlock(&softc->lock); 2484 2485 retval = ctl_remove_lun(cbe_lun); 2486 if (retval != 0) { 2487 snprintf(req->error_str, sizeof(req->error_str), 2488 "error %d returned from ctl_remove_lun() for " 2489 "LUN %d", retval, params->lun_id); 2490 mtx_lock(&softc->lock); 2491 be_lun->flags &= ~CTL_BE_BLOCK_LUN_WAITING; 2492 mtx_unlock(&softc->lock); 2493 goto bailout_error; 2494 } 2495 2496 mtx_lock(&softc->lock); 2497 while ((be_lun->flags & CTL_BE_BLOCK_LUN_UNCONFIGURED) == 0) { 2498 retval = msleep(be_lun, &softc->lock, PCATCH, "ctlblockrm", 0); 2499 if (retval == EINTR) 2500 break; 2501 } 2502 be_lun->flags &= ~CTL_BE_BLOCK_LUN_WAITING; 2503 if (be_lun->flags & CTL_BE_BLOCK_LUN_UNCONFIGURED) { 2504 mtx_unlock(&softc->lock); 2505 free(be_lun, M_CTLBLK); 2506 } else { 2507 mtx_unlock(&softc->lock); 2508 return (EINTR); 2509 } 2510 2511 req->status = CTL_LUN_OK; 2512 return (0); 2513 2514 bailout_error: 2515 req->status = CTL_LUN_ERROR; 2516 return (0); 2517 } 2518 2519 static int 2520 ctl_be_block_modify(struct ctl_be_block_softc *softc, struct ctl_lun_req *req) 2521 { 2522 struct ctl_lun_modify_params *params; 2523 struct ctl_be_block_lun *be_lun; 2524 struct ctl_be_lun *cbe_lun; 2525 const char *value; 2526 uint64_t oldsize; 2527 int error, wasprim; 2528 2529 params = &req->reqdata.modify; 2530 2531 sx_xlock(&softc->modify_lock); 2532 mtx_lock(&softc->lock); 2533 SLIST_FOREACH(be_lun, &softc->lun_list, links) { 2534 if (be_lun->cbe_lun.lun_id == params->lun_id) 2535 break; 2536 } 2537 mtx_unlock(&softc->lock); 2538 if (be_lun == NULL) { 2539 snprintf(req->error_str, sizeof(req->error_str), 2540 "LUN %u is not managed by the block backend", 2541 params->lun_id); 2542 goto bailout_error; 2543 } 2544 cbe_lun = &be_lun->cbe_lun; 2545 2546 if (params->lun_size_bytes != 0) 2547 be_lun->params.lun_size_bytes = params->lun_size_bytes; 2548 2549 if (req->args_nvl != NULL) { 2550 nvlist_destroy(cbe_lun->options); 2551 cbe_lun->options = nvlist_clone(req->args_nvl); 2552 } 2553 2554 wasprim = (cbe_lun->flags & CTL_LUN_FLAG_PRIMARY); 2555 value = dnvlist_get_string(cbe_lun->options, "ha_role", NULL); 2556 if (value != NULL) { 2557 if (strcmp(value, "primary") == 0) 2558 cbe_lun->flags |= CTL_LUN_FLAG_PRIMARY; 2559 else 2560 cbe_lun->flags &= ~CTL_LUN_FLAG_PRIMARY; 2561 } else if (control_softc->flags & CTL_FLAG_ACTIVE_SHELF) 2562 cbe_lun->flags |= CTL_LUN_FLAG_PRIMARY; 2563 else 2564 cbe_lun->flags &= ~CTL_LUN_FLAG_PRIMARY; 2565 if (wasprim != (cbe_lun->flags & CTL_LUN_FLAG_PRIMARY)) { 2566 if (cbe_lun->flags & CTL_LUN_FLAG_PRIMARY) 2567 ctl_lun_primary(cbe_lun); 2568 else 2569 ctl_lun_secondary(cbe_lun); 2570 } 2571 2572 oldsize = be_lun->size_blocks; 2573 if ((cbe_lun->flags & CTL_LUN_FLAG_PRIMARY) || 2574 control_softc->ha_mode == CTL_HA_MODE_SER_ONLY) { 2575 if (be_lun->vn == NULL) 2576 error = ctl_be_block_open(be_lun, req); 2577 else if (vn_isdisk_error(be_lun->vn, &error)) 2578 error = ctl_be_block_open_dev(be_lun, req); 2579 else if (be_lun->vn->v_type == VREG) { 2580 vn_lock(be_lun->vn, LK_SHARED | LK_RETRY); 2581 error = ctl_be_block_open_file(be_lun, req); 2582 VOP_UNLOCK(be_lun->vn); 2583 } else 2584 error = EINVAL; 2585 if ((cbe_lun->flags & CTL_LUN_FLAG_NO_MEDIA) && 2586 be_lun->vn != NULL) { 2587 cbe_lun->flags &= ~CTL_LUN_FLAG_NO_MEDIA; 2588 ctl_lun_has_media(cbe_lun); 2589 } else if ((cbe_lun->flags & CTL_LUN_FLAG_NO_MEDIA) == 0 && 2590 be_lun->vn == NULL) { 2591 cbe_lun->flags |= CTL_LUN_FLAG_NO_MEDIA; 2592 ctl_lun_no_media(cbe_lun); 2593 } 2594 cbe_lun->flags &= ~CTL_LUN_FLAG_EJECTED; 2595 } else { 2596 if (be_lun->vn != NULL) { 2597 cbe_lun->flags |= CTL_LUN_FLAG_NO_MEDIA; 2598 ctl_lun_no_media(cbe_lun); 2599 taskqueue_drain_all(be_lun->io_taskqueue); 2600 error = ctl_be_block_close(be_lun); 2601 } else 2602 error = 0; 2603 } 2604 if (be_lun->size_blocks != oldsize) 2605 ctl_lun_capacity_changed(cbe_lun); 2606 2607 /* Tell the user the exact size we ended up using */ 2608 params->lun_size_bytes = be_lun->size_bytes; 2609 2610 sx_xunlock(&softc->modify_lock); 2611 req->status = error ? CTL_LUN_WARNING : CTL_LUN_OK; 2612 return (0); 2613 2614 bailout_error: 2615 sx_xunlock(&softc->modify_lock); 2616 req->status = CTL_LUN_ERROR; 2617 return (0); 2618 } 2619 2620 static void 2621 ctl_be_block_lun_shutdown(struct ctl_be_lun *cbe_lun) 2622 { 2623 struct ctl_be_block_lun *be_lun = (struct ctl_be_block_lun *)cbe_lun; 2624 struct ctl_be_block_softc *softc = be_lun->softc; 2625 2626 taskqueue_drain_all(be_lun->io_taskqueue); 2627 taskqueue_free(be_lun->io_taskqueue); 2628 if (be_lun->disk_stats != NULL) 2629 devstat_remove_entry(be_lun->disk_stats); 2630 nvlist_destroy(be_lun->cbe_lun.options); 2631 free(be_lun->dev_path, M_CTLBLK); 2632 mtx_destroy(&be_lun->queue_lock); 2633 mtx_destroy(&be_lun->io_lock); 2634 2635 mtx_lock(&softc->lock); 2636 be_lun->flags |= CTL_BE_BLOCK_LUN_UNCONFIGURED; 2637 if (be_lun->flags & CTL_BE_BLOCK_LUN_WAITING) 2638 wakeup(be_lun); 2639 else 2640 free(be_lun, M_CTLBLK); 2641 mtx_unlock(&softc->lock); 2642 } 2643 2644 static int 2645 ctl_be_block_config_write(union ctl_io *io) 2646 { 2647 struct ctl_be_block_lun *be_lun; 2648 struct ctl_be_lun *cbe_lun; 2649 int retval; 2650 2651 DPRINTF("entered\n"); 2652 2653 cbe_lun = CTL_BACKEND_LUN(io); 2654 be_lun = (struct ctl_be_block_lun *)cbe_lun; 2655 2656 retval = 0; 2657 switch (io->scsiio.cdb[0]) { 2658 case SYNCHRONIZE_CACHE: 2659 case SYNCHRONIZE_CACHE_16: 2660 case WRITE_SAME_10: 2661 case WRITE_SAME_16: 2662 case UNMAP: 2663 /* 2664 * The upper level CTL code will filter out any CDBs with 2665 * the immediate bit set and return the proper error. 2666 * 2667 * We don't really need to worry about what LBA range the 2668 * user asked to be synced out. When they issue a sync 2669 * cache command, we'll sync out the whole thing. 2670 */ 2671 mtx_lock(&be_lun->queue_lock); 2672 STAILQ_INSERT_TAIL(&be_lun->config_write_queue, &io->io_hdr, 2673 links); 2674 mtx_unlock(&be_lun->queue_lock); 2675 taskqueue_enqueue(be_lun->io_taskqueue, &be_lun->io_task); 2676 break; 2677 case START_STOP_UNIT: { 2678 struct scsi_start_stop_unit *cdb; 2679 struct ctl_lun_req req; 2680 2681 cdb = (struct scsi_start_stop_unit *)io->scsiio.cdb; 2682 if ((cdb->how & SSS_PC_MASK) != 0) { 2683 ctl_set_success(&io->scsiio); 2684 ctl_config_write_done(io); 2685 break; 2686 } 2687 if (cdb->how & SSS_START) { 2688 if ((cdb->how & SSS_LOEJ) && be_lun->vn == NULL) { 2689 retval = ctl_be_block_open(be_lun, &req); 2690 cbe_lun->flags &= ~CTL_LUN_FLAG_EJECTED; 2691 if (retval == 0) { 2692 cbe_lun->flags &= ~CTL_LUN_FLAG_NO_MEDIA; 2693 ctl_lun_has_media(cbe_lun); 2694 } else { 2695 cbe_lun->flags |= CTL_LUN_FLAG_NO_MEDIA; 2696 ctl_lun_no_media(cbe_lun); 2697 } 2698 } 2699 ctl_start_lun(cbe_lun); 2700 } else { 2701 ctl_stop_lun(cbe_lun); 2702 if (cdb->how & SSS_LOEJ) { 2703 cbe_lun->flags |= CTL_LUN_FLAG_NO_MEDIA; 2704 cbe_lun->flags |= CTL_LUN_FLAG_EJECTED; 2705 ctl_lun_ejected(cbe_lun); 2706 if (be_lun->vn != NULL) 2707 ctl_be_block_close(be_lun); 2708 } 2709 } 2710 2711 ctl_set_success(&io->scsiio); 2712 ctl_config_write_done(io); 2713 break; 2714 } 2715 case PREVENT_ALLOW: 2716 ctl_set_success(&io->scsiio); 2717 ctl_config_write_done(io); 2718 break; 2719 default: 2720 ctl_set_invalid_opcode(&io->scsiio); 2721 ctl_config_write_done(io); 2722 retval = CTL_RETVAL_COMPLETE; 2723 break; 2724 } 2725 2726 return (retval); 2727 } 2728 2729 static int 2730 ctl_be_block_config_read(union ctl_io *io) 2731 { 2732 struct ctl_be_block_lun *be_lun; 2733 int retval = 0; 2734 2735 DPRINTF("entered\n"); 2736 2737 be_lun = (struct ctl_be_block_lun *)CTL_BACKEND_LUN(io); 2738 2739 switch (io->scsiio.cdb[0]) { 2740 case SERVICE_ACTION_IN: 2741 if (io->scsiio.cdb[1] == SGLS_SERVICE_ACTION) { 2742 mtx_lock(&be_lun->queue_lock); 2743 STAILQ_INSERT_TAIL(&be_lun->config_read_queue, 2744 &io->io_hdr, links); 2745 mtx_unlock(&be_lun->queue_lock); 2746 taskqueue_enqueue(be_lun->io_taskqueue, 2747 &be_lun->io_task); 2748 retval = CTL_RETVAL_QUEUED; 2749 break; 2750 } 2751 ctl_set_invalid_field(&io->scsiio, 2752 /*sks_valid*/ 1, 2753 /*command*/ 1, 2754 /*field*/ 1, 2755 /*bit_valid*/ 1, 2756 /*bit*/ 4); 2757 ctl_config_read_done(io); 2758 retval = CTL_RETVAL_COMPLETE; 2759 break; 2760 default: 2761 ctl_set_invalid_opcode(&io->scsiio); 2762 ctl_config_read_done(io); 2763 retval = CTL_RETVAL_COMPLETE; 2764 break; 2765 } 2766 2767 return (retval); 2768 } 2769 2770 static int 2771 ctl_be_block_lun_info(struct ctl_be_lun *cbe_lun, struct sbuf *sb) 2772 { 2773 struct ctl_be_block_lun *lun = (struct ctl_be_block_lun *)cbe_lun; 2774 int retval; 2775 2776 retval = sbuf_printf(sb, "\t<num_threads>"); 2777 if (retval != 0) 2778 goto bailout; 2779 retval = sbuf_printf(sb, "%d", lun->num_threads); 2780 if (retval != 0) 2781 goto bailout; 2782 retval = sbuf_printf(sb, "</num_threads>\n"); 2783 2784 bailout: 2785 return (retval); 2786 } 2787 2788 static uint64_t 2789 ctl_be_block_lun_attr(struct ctl_be_lun *cbe_lun, const char *attrname) 2790 { 2791 struct ctl_be_block_lun *lun = (struct ctl_be_block_lun *)cbe_lun; 2792 2793 if (lun->getattr == NULL) 2794 return (UINT64_MAX); 2795 return (lun->getattr(lun, attrname)); 2796 } 2797 2798 static int 2799 ctl_be_block_init(void) 2800 { 2801 struct ctl_be_block_softc *softc = &backend_block_softc; 2802 2803 sx_init(&softc->modify_lock, "ctlblock modify"); 2804 mtx_init(&softc->lock, "ctlblock", NULL, MTX_DEF); 2805 softc->beio_zone = uma_zcreate("beio", sizeof(struct ctl_be_block_io), 2806 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 2807 softc->bufmin_zone = uma_zcreate("ctlblockmin", CTLBLK_MIN_SEG, 2808 NULL, NULL, NULL, NULL, /*align*/ 0, /*flags*/0); 2809 if (CTLBLK_MIN_SEG < CTLBLK_MAX_SEG) 2810 softc->bufmax_zone = uma_zcreate("ctlblockmax", CTLBLK_MAX_SEG, 2811 NULL, NULL, NULL, NULL, /*align*/ 0, /*flags*/0); 2812 SLIST_INIT(&softc->lun_list); 2813 return (0); 2814 } 2815 2816 static int 2817 ctl_be_block_shutdown(void) 2818 { 2819 struct ctl_be_block_softc *softc = &backend_block_softc; 2820 struct ctl_be_block_lun *lun; 2821 2822 mtx_lock(&softc->lock); 2823 while ((lun = SLIST_FIRST(&softc->lun_list)) != NULL) { 2824 SLIST_REMOVE_HEAD(&softc->lun_list, links); 2825 softc->num_luns--; 2826 /* 2827 * Drop our lock here. Since ctl_remove_lun() can call 2828 * back into us, this could potentially lead to a recursive 2829 * lock of the same mutex, which would cause a hang. 2830 */ 2831 mtx_unlock(&softc->lock); 2832 ctl_remove_lun(&lun->cbe_lun); 2833 mtx_lock(&softc->lock); 2834 } 2835 mtx_unlock(&softc->lock); 2836 uma_zdestroy(softc->bufmin_zone); 2837 if (CTLBLK_MIN_SEG < CTLBLK_MAX_SEG) 2838 uma_zdestroy(softc->bufmax_zone); 2839 uma_zdestroy(softc->beio_zone); 2840 mtx_destroy(&softc->lock); 2841 sx_destroy(&softc->modify_lock); 2842 return (0); 2843 } 2844