1 /*- 2 * Copyright (c) 2003 Silicon Graphics International Corp. 3 * Copyright (c) 2009-2011 Spectra Logic Corporation 4 * Copyright (c) 2012 The FreeBSD Foundation 5 * All rights reserved. 6 * 7 * Portions of this software were developed by Edward Tomasz Napierala 8 * under sponsorship from the FreeBSD Foundation. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions, and the following disclaimer, 15 * without modification. 16 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 17 * substantially similar to the "NO WARRANTY" disclaimer below 18 * ("Disclaimer") and any redistribution must be conditioned upon 19 * including a substantially similar Disclaimer requirement for further 20 * binary redistribution. 21 * 22 * NO WARRANTY 23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 26 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 27 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 31 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 32 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 * POSSIBILITY OF SUCH DAMAGES. 34 * 35 * $Id: //depot/users/kenm/FreeBSD-test2/sys/cam/ctl/ctl_backend_block.c#5 $ 36 */ 37 /* 38 * CAM Target Layer driver backend for block devices. 39 * 40 * Author: Ken Merry <ken@FreeBSD.org> 41 */ 42 #include <sys/cdefs.h> 43 __FBSDID("$FreeBSD$"); 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/kernel.h> 48 #include <sys/types.h> 49 #include <sys/kthread.h> 50 #include <sys/bio.h> 51 #include <sys/fcntl.h> 52 #include <sys/limits.h> 53 #include <sys/lock.h> 54 #include <sys/mutex.h> 55 #include <sys/condvar.h> 56 #include <sys/malloc.h> 57 #include <sys/conf.h> 58 #include <sys/ioccom.h> 59 #include <sys/queue.h> 60 #include <sys/sbuf.h> 61 #include <sys/endian.h> 62 #include <sys/uio.h> 63 #include <sys/buf.h> 64 #include <sys/taskqueue.h> 65 #include <sys/vnode.h> 66 #include <sys/namei.h> 67 #include <sys/mount.h> 68 #include <sys/disk.h> 69 #include <sys/fcntl.h> 70 #include <sys/filedesc.h> 71 #include <sys/proc.h> 72 #include <sys/pcpu.h> 73 #include <sys/module.h> 74 #include <sys/sdt.h> 75 #include <sys/devicestat.h> 76 #include <sys/sysctl.h> 77 78 #include <geom/geom.h> 79 80 #include <cam/cam.h> 81 #include <cam/scsi/scsi_all.h> 82 #include <cam/scsi/scsi_da.h> 83 #include <cam/ctl/ctl_io.h> 84 #include <cam/ctl/ctl.h> 85 #include <cam/ctl/ctl_backend.h> 86 #include <cam/ctl/ctl_frontend_internal.h> 87 #include <cam/ctl/ctl_ioctl.h> 88 #include <cam/ctl/ctl_scsi_all.h> 89 #include <cam/ctl/ctl_error.h> 90 91 /* 92 * The idea here is that we'll allocate enough S/G space to hold a 1MB 93 * I/O. If we get an I/O larger than that, we'll split it. 94 */ 95 #define CTLBLK_HALF_IO_SIZE (512 * 1024) 96 #define CTLBLK_MAX_IO_SIZE (CTLBLK_HALF_IO_SIZE * 2) 97 #define CTLBLK_MAX_SEG MAXPHYS 98 #define CTLBLK_HALF_SEGS MAX(CTLBLK_HALF_IO_SIZE / CTLBLK_MAX_SEG, 1) 99 #define CTLBLK_MAX_SEGS (CTLBLK_HALF_SEGS * 2) 100 101 #ifdef CTLBLK_DEBUG 102 #define DPRINTF(fmt, args...) \ 103 printf("cbb(%s:%d): " fmt, __FUNCTION__, __LINE__, ##args) 104 #else 105 #define DPRINTF(fmt, args...) do {} while(0) 106 #endif 107 108 #define PRIV(io) \ 109 ((struct ctl_ptr_len_flags *)&(io)->io_hdr.ctl_private[CTL_PRIV_BACKEND]) 110 #define ARGS(io) \ 111 ((struct ctl_lba_len_flags *)&(io)->io_hdr.ctl_private[CTL_PRIV_LBA_LEN]) 112 113 SDT_PROVIDER_DEFINE(cbb); 114 115 typedef enum { 116 CTL_BE_BLOCK_LUN_UNCONFIGURED = 0x01, 117 CTL_BE_BLOCK_LUN_CONFIG_ERR = 0x02, 118 CTL_BE_BLOCK_LUN_WAITING = 0x04, 119 CTL_BE_BLOCK_LUN_MULTI_THREAD = 0x08 120 } ctl_be_block_lun_flags; 121 122 typedef enum { 123 CTL_BE_BLOCK_NONE, 124 CTL_BE_BLOCK_DEV, 125 CTL_BE_BLOCK_FILE 126 } ctl_be_block_type; 127 128 struct ctl_be_block_devdata { 129 struct cdev *cdev; 130 struct cdevsw *csw; 131 int dev_ref; 132 }; 133 134 struct ctl_be_block_filedata { 135 struct ucred *cred; 136 }; 137 138 union ctl_be_block_bedata { 139 struct ctl_be_block_devdata dev; 140 struct ctl_be_block_filedata file; 141 }; 142 143 struct ctl_be_block_io; 144 struct ctl_be_block_lun; 145 146 typedef void (*cbb_dispatch_t)(struct ctl_be_block_lun *be_lun, 147 struct ctl_be_block_io *beio); 148 typedef uint64_t (*cbb_getattr_t)(struct ctl_be_block_lun *be_lun, 149 const char *attrname); 150 151 /* 152 * Backend LUN structure. There is a 1:1 mapping between a block device 153 * and a backend block LUN, and between a backend block LUN and a CTL LUN. 154 */ 155 struct ctl_be_block_lun { 156 struct ctl_lun_create_params params; 157 struct ctl_block_disk *disk; 158 char lunname[32]; 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_getattr_t getattr; 167 uma_zone_t lun_zone; 168 uint64_t size_blocks; 169 uint64_t size_bytes; 170 uint32_t blocksize; 171 int blocksize_shift; 172 uint16_t pblockexp; 173 uint16_t pblockoff; 174 struct ctl_be_block_softc *softc; 175 struct devstat *disk_stats; 176 ctl_be_block_lun_flags flags; 177 STAILQ_ENTRY(ctl_be_block_lun) links; 178 struct ctl_be_lun ctl_be_lun; 179 struct taskqueue *io_taskqueue; 180 struct task io_task; 181 int num_threads; 182 STAILQ_HEAD(, ctl_io_hdr) input_queue; 183 STAILQ_HEAD(, ctl_io_hdr) config_write_queue; 184 STAILQ_HEAD(, ctl_io_hdr) datamove_queue; 185 struct mtx_padalign io_lock; 186 struct mtx_padalign queue_lock; 187 }; 188 189 /* 190 * Overall softc structure for the block backend module. 191 */ 192 struct ctl_be_block_softc { 193 struct mtx lock; 194 int num_disks; 195 STAILQ_HEAD(, ctl_block_disk) disk_list; 196 int num_luns; 197 STAILQ_HEAD(, ctl_be_block_lun) lun_list; 198 }; 199 200 static struct ctl_be_block_softc backend_block_softc; 201 202 /* 203 * Per-I/O information. 204 */ 205 struct ctl_be_block_io { 206 union ctl_io *io; 207 struct ctl_sg_entry sg_segs[CTLBLK_MAX_SEGS]; 208 struct iovec xiovecs[CTLBLK_MAX_SEGS]; 209 int bio_cmd; 210 int num_segs; 211 int num_bios_sent; 212 int num_bios_done; 213 int send_complete; 214 int num_errors; 215 struct bintime ds_t0; 216 devstat_tag_type ds_tag_type; 217 devstat_trans_flags ds_trans_type; 218 uint64_t io_len; 219 uint64_t io_offset; 220 struct ctl_be_block_softc *softc; 221 struct ctl_be_block_lun *lun; 222 void (*beio_cont)(struct ctl_be_block_io *beio); /* to continue processing */ 223 }; 224 225 static int cbb_num_threads = 14; 226 SYSCTL_NODE(_kern_cam_ctl, OID_AUTO, block, CTLFLAG_RD, 0, 227 "CAM Target Layer Block Backend"); 228 SYSCTL_INT(_kern_cam_ctl_block, OID_AUTO, num_threads, CTLFLAG_RWTUN, 229 &cbb_num_threads, 0, "Number of threads per backing file"); 230 231 static struct ctl_be_block_io *ctl_alloc_beio(struct ctl_be_block_softc *softc); 232 static void ctl_free_beio(struct ctl_be_block_io *beio); 233 static void ctl_complete_beio(struct ctl_be_block_io *beio); 234 static int ctl_be_block_move_done(union ctl_io *io); 235 static void ctl_be_block_biodone(struct bio *bio); 236 static void ctl_be_block_flush_file(struct ctl_be_block_lun *be_lun, 237 struct ctl_be_block_io *beio); 238 static void ctl_be_block_dispatch_file(struct ctl_be_block_lun *be_lun, 239 struct ctl_be_block_io *beio); 240 static void ctl_be_block_flush_dev(struct ctl_be_block_lun *be_lun, 241 struct ctl_be_block_io *beio); 242 static void ctl_be_block_unmap_dev(struct ctl_be_block_lun *be_lun, 243 struct ctl_be_block_io *beio); 244 static void ctl_be_block_dispatch_dev(struct ctl_be_block_lun *be_lun, 245 struct ctl_be_block_io *beio); 246 static uint64_t ctl_be_block_getattr_dev(struct ctl_be_block_lun *be_lun, 247 const char *attrname); 248 static void ctl_be_block_cw_dispatch(struct ctl_be_block_lun *be_lun, 249 union ctl_io *io); 250 static void ctl_be_block_dispatch(struct ctl_be_block_lun *be_lun, 251 union ctl_io *io); 252 static void ctl_be_block_worker(void *context, int pending); 253 static int ctl_be_block_submit(union ctl_io *io); 254 static int ctl_be_block_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, 255 int flag, struct thread *td); 256 static int ctl_be_block_open_file(struct ctl_be_block_lun *be_lun, 257 struct ctl_lun_req *req); 258 static int ctl_be_block_open_dev(struct ctl_be_block_lun *be_lun, 259 struct ctl_lun_req *req); 260 static int ctl_be_block_close(struct ctl_be_block_lun *be_lun); 261 static int ctl_be_block_open(struct ctl_be_block_softc *softc, 262 struct ctl_be_block_lun *be_lun, 263 struct ctl_lun_req *req); 264 static int ctl_be_block_create(struct ctl_be_block_softc *softc, 265 struct ctl_lun_req *req); 266 static int ctl_be_block_rm(struct ctl_be_block_softc *softc, 267 struct ctl_lun_req *req); 268 static int ctl_be_block_modify_file(struct ctl_be_block_lun *be_lun, 269 struct ctl_lun_req *req); 270 static int ctl_be_block_modify_dev(struct ctl_be_block_lun *be_lun, 271 struct ctl_lun_req *req); 272 static int ctl_be_block_modify(struct ctl_be_block_softc *softc, 273 struct ctl_lun_req *req); 274 static void ctl_be_block_lun_shutdown(void *be_lun); 275 static void ctl_be_block_lun_config_status(void *be_lun, 276 ctl_lun_config_status status); 277 static int ctl_be_block_config_write(union ctl_io *io); 278 static int ctl_be_block_config_read(union ctl_io *io); 279 static int ctl_be_block_lun_info(void *be_lun, struct sbuf *sb); 280 static uint64_t ctl_be_block_lun_attr(void *be_lun, const char *attrname); 281 int ctl_be_block_init(void); 282 283 static struct ctl_backend_driver ctl_be_block_driver = 284 { 285 .name = "block", 286 .flags = CTL_BE_FLAG_HAS_CONFIG, 287 .init = ctl_be_block_init, 288 .data_submit = ctl_be_block_submit, 289 .data_move_done = ctl_be_block_move_done, 290 .config_read = ctl_be_block_config_read, 291 .config_write = ctl_be_block_config_write, 292 .ioctl = ctl_be_block_ioctl, 293 .lun_info = ctl_be_block_lun_info, 294 .lun_attr = ctl_be_block_lun_attr 295 }; 296 297 MALLOC_DEFINE(M_CTLBLK, "ctlblk", "Memory used for CTL block backend"); 298 CTL_BACKEND_DECLARE(cbb, ctl_be_block_driver); 299 300 static uma_zone_t beio_zone; 301 302 static struct ctl_be_block_io * 303 ctl_alloc_beio(struct ctl_be_block_softc *softc) 304 { 305 struct ctl_be_block_io *beio; 306 307 beio = uma_zalloc(beio_zone, M_WAITOK | M_ZERO); 308 beio->softc = softc; 309 return (beio); 310 } 311 312 static void 313 ctl_free_beio(struct ctl_be_block_io *beio) 314 { 315 int duplicate_free; 316 int i; 317 318 duplicate_free = 0; 319 320 for (i = 0; i < beio->num_segs; i++) { 321 if (beio->sg_segs[i].addr == NULL) 322 duplicate_free++; 323 324 uma_zfree(beio->lun->lun_zone, beio->sg_segs[i].addr); 325 beio->sg_segs[i].addr = NULL; 326 327 /* For compare we had two equal S/G lists. */ 328 if (ARGS(beio->io)->flags & CTL_LLF_COMPARE) { 329 uma_zfree(beio->lun->lun_zone, 330 beio->sg_segs[i + CTLBLK_HALF_SEGS].addr); 331 beio->sg_segs[i + CTLBLK_HALF_SEGS].addr = NULL; 332 } 333 } 334 335 if (duplicate_free > 0) { 336 printf("%s: %d duplicate frees out of %d segments\n", __func__, 337 duplicate_free, beio->num_segs); 338 } 339 340 uma_zfree(beio_zone, beio); 341 } 342 343 static void 344 ctl_complete_beio(struct ctl_be_block_io *beio) 345 { 346 union ctl_io *io = beio->io; 347 348 if (beio->beio_cont != NULL) { 349 beio->beio_cont(beio); 350 } else { 351 ctl_free_beio(beio); 352 ctl_data_submit_done(io); 353 } 354 } 355 356 static int 357 ctl_be_block_move_done(union ctl_io *io) 358 { 359 struct ctl_be_block_io *beio; 360 struct ctl_be_block_lun *be_lun; 361 struct ctl_lba_len_flags *lbalen; 362 #ifdef CTL_TIME_IO 363 struct bintime cur_bt; 364 #endif 365 int i; 366 367 beio = (struct ctl_be_block_io *)PRIV(io)->ptr; 368 be_lun = beio->lun; 369 370 DPRINTF("entered\n"); 371 372 #ifdef CTL_TIME_IO 373 getbintime(&cur_bt); 374 bintime_sub(&cur_bt, &io->io_hdr.dma_start_bt); 375 bintime_add(&io->io_hdr.dma_bt, &cur_bt); 376 io->io_hdr.num_dmas++; 377 #endif 378 io->scsiio.kern_rel_offset += io->scsiio.kern_data_len; 379 380 /* 381 * We set status at this point for read commands, and write 382 * commands with errors. 383 */ 384 if (io->io_hdr.flags & CTL_FLAG_ABORT) { 385 ; 386 } else if ((io->io_hdr.port_status == 0) && 387 ((io->io_hdr.status & CTL_STATUS_MASK) == CTL_STATUS_NONE)) { 388 lbalen = ARGS(beio->io); 389 if (lbalen->flags & CTL_LLF_READ) { 390 ctl_set_success(&io->scsiio); 391 } else if (lbalen->flags & CTL_LLF_COMPARE) { 392 /* We have two data blocks ready for comparison. */ 393 for (i = 0; i < beio->num_segs; i++) { 394 if (memcmp(beio->sg_segs[i].addr, 395 beio->sg_segs[i + CTLBLK_HALF_SEGS].addr, 396 beio->sg_segs[i].len) != 0) 397 break; 398 } 399 if (i < beio->num_segs) 400 ctl_set_sense(&io->scsiio, 401 /*current_error*/ 1, 402 /*sense_key*/ SSD_KEY_MISCOMPARE, 403 /*asc*/ 0x1D, 404 /*ascq*/ 0x00, 405 SSD_ELEM_NONE); 406 else 407 ctl_set_success(&io->scsiio); 408 } 409 } else if ((io->io_hdr.port_status != 0) && 410 ((io->io_hdr.status & CTL_STATUS_MASK) == CTL_STATUS_NONE || 411 (io->io_hdr.status & CTL_STATUS_MASK) == CTL_SUCCESS)) { 412 /* 413 * For hardware error sense keys, the sense key 414 * specific value is defined to be a retry count, 415 * but we use it to pass back an internal FETD 416 * error code. XXX KDM Hopefully the FETD is only 417 * using 16 bits for an error code, since that's 418 * all the space we have in the sks field. 419 */ 420 ctl_set_internal_failure(&io->scsiio, 421 /*sks_valid*/ 1, 422 /*retry_count*/ 423 io->io_hdr.port_status); 424 } 425 426 /* 427 * If this is a read, or a write with errors, it is done. 428 */ 429 if ((beio->bio_cmd == BIO_READ) 430 || ((io->io_hdr.flags & CTL_FLAG_ABORT) != 0) 431 || ((io->io_hdr.status & CTL_STATUS_MASK) != CTL_STATUS_NONE)) { 432 ctl_complete_beio(beio); 433 return (0); 434 } 435 436 /* 437 * At this point, we have a write and the DMA completed 438 * successfully. We now have to queue it to the task queue to 439 * execute the backend I/O. That is because we do blocking 440 * memory allocations, and in the file backing case, blocking I/O. 441 * This move done routine is generally called in the SIM's 442 * interrupt context, and therefore we cannot block. 443 */ 444 mtx_lock(&be_lun->queue_lock); 445 /* 446 * XXX KDM make sure that links is okay to use at this point. 447 * Otherwise, we either need to add another field to ctl_io_hdr, 448 * or deal with resource allocation here. 449 */ 450 STAILQ_INSERT_TAIL(&be_lun->datamove_queue, &io->io_hdr, links); 451 mtx_unlock(&be_lun->queue_lock); 452 453 taskqueue_enqueue(be_lun->io_taskqueue, &be_lun->io_task); 454 455 return (0); 456 } 457 458 static void 459 ctl_be_block_biodone(struct bio *bio) 460 { 461 struct ctl_be_block_io *beio; 462 struct ctl_be_block_lun *be_lun; 463 union ctl_io *io; 464 int error; 465 466 beio = bio->bio_caller1; 467 be_lun = beio->lun; 468 io = beio->io; 469 470 DPRINTF("entered\n"); 471 472 error = bio->bio_error; 473 mtx_lock(&be_lun->io_lock); 474 if (error != 0) 475 beio->num_errors++; 476 477 beio->num_bios_done++; 478 479 /* 480 * XXX KDM will this cause WITNESS to complain? Holding a lock 481 * during the free might cause it to complain. 482 */ 483 g_destroy_bio(bio); 484 485 /* 486 * If the send complete bit isn't set, or we aren't the last I/O to 487 * complete, then we're done. 488 */ 489 if ((beio->send_complete == 0) 490 || (beio->num_bios_done < beio->num_bios_sent)) { 491 mtx_unlock(&be_lun->io_lock); 492 return; 493 } 494 495 /* 496 * At this point, we've verified that we are the last I/O to 497 * complete, so it's safe to drop the lock. 498 */ 499 devstat_end_transaction(beio->lun->disk_stats, beio->io_len, 500 beio->ds_tag_type, beio->ds_trans_type, 501 /*now*/ NULL, /*then*/&beio->ds_t0); 502 mtx_unlock(&be_lun->io_lock); 503 504 /* 505 * If there are any errors from the backing device, we fail the 506 * entire I/O with a medium error. 507 */ 508 if (beio->num_errors > 0) { 509 if (error == EOPNOTSUPP) { 510 ctl_set_invalid_opcode(&io->scsiio); 511 } else if (error == ENOSPC) { 512 ctl_set_space_alloc_fail(&io->scsiio); 513 } else if (beio->bio_cmd == BIO_FLUSH) { 514 /* XXX KDM is there is a better error here? */ 515 ctl_set_internal_failure(&io->scsiio, 516 /*sks_valid*/ 1, 517 /*retry_count*/ 0xbad2); 518 } else 519 ctl_set_medium_error(&io->scsiio); 520 ctl_complete_beio(beio); 521 return; 522 } 523 524 /* 525 * If this is a write, a flush, a delete or verify, we're all done. 526 * If this is a read, we can now send the data to the user. 527 */ 528 if ((beio->bio_cmd == BIO_WRITE) 529 || (beio->bio_cmd == BIO_FLUSH) 530 || (beio->bio_cmd == BIO_DELETE) 531 || (ARGS(io)->flags & CTL_LLF_VERIFY)) { 532 ctl_set_success(&io->scsiio); 533 ctl_complete_beio(beio); 534 } else { 535 if ((ARGS(io)->flags & CTL_LLF_READ) && 536 beio->beio_cont == NULL) 537 ctl_set_success(&io->scsiio); 538 #ifdef CTL_TIME_IO 539 getbintime(&io->io_hdr.dma_start_bt); 540 #endif 541 ctl_datamove(io); 542 } 543 } 544 545 static void 546 ctl_be_block_flush_file(struct ctl_be_block_lun *be_lun, 547 struct ctl_be_block_io *beio) 548 { 549 union ctl_io *io = beio->io; 550 struct mount *mountpoint; 551 int error, lock_flags; 552 553 DPRINTF("entered\n"); 554 555 binuptime(&beio->ds_t0); 556 mtx_lock(&be_lun->io_lock); 557 devstat_start_transaction(beio->lun->disk_stats, &beio->ds_t0); 558 mtx_unlock(&be_lun->io_lock); 559 560 (void) vn_start_write(be_lun->vn, &mountpoint, V_WAIT); 561 562 if (MNT_SHARED_WRITES(mountpoint) 563 || ((mountpoint == NULL) 564 && MNT_SHARED_WRITES(be_lun->vn->v_mount))) 565 lock_flags = LK_SHARED; 566 else 567 lock_flags = LK_EXCLUSIVE; 568 569 vn_lock(be_lun->vn, lock_flags | LK_RETRY); 570 571 error = VOP_FSYNC(be_lun->vn, MNT_WAIT, curthread); 572 VOP_UNLOCK(be_lun->vn, 0); 573 574 vn_finished_write(mountpoint); 575 576 mtx_lock(&be_lun->io_lock); 577 devstat_end_transaction(beio->lun->disk_stats, beio->io_len, 578 beio->ds_tag_type, beio->ds_trans_type, 579 /*now*/ NULL, /*then*/&beio->ds_t0); 580 mtx_unlock(&be_lun->io_lock); 581 582 if (error == 0) 583 ctl_set_success(&io->scsiio); 584 else { 585 /* XXX KDM is there is a better error here? */ 586 ctl_set_internal_failure(&io->scsiio, 587 /*sks_valid*/ 1, 588 /*retry_count*/ 0xbad1); 589 } 590 591 ctl_complete_beio(beio); 592 } 593 594 SDT_PROBE_DEFINE1(cbb, kernel, read, file_start, "uint64_t"); 595 SDT_PROBE_DEFINE1(cbb, kernel, write, file_start, "uint64_t"); 596 SDT_PROBE_DEFINE1(cbb, kernel, read, file_done,"uint64_t"); 597 SDT_PROBE_DEFINE1(cbb, kernel, write, file_done, "uint64_t"); 598 599 static void 600 ctl_be_block_dispatch_file(struct ctl_be_block_lun *be_lun, 601 struct ctl_be_block_io *beio) 602 { 603 struct ctl_be_block_filedata *file_data; 604 union ctl_io *io; 605 struct uio xuio; 606 struct iovec *xiovec; 607 int flags; 608 int error, i; 609 610 DPRINTF("entered\n"); 611 612 file_data = &be_lun->backend.file; 613 io = beio->io; 614 flags = 0; 615 if (ARGS(io)->flags & CTL_LLF_DPO) 616 flags |= IO_DIRECT; 617 if (beio->bio_cmd == BIO_WRITE && ARGS(io)->flags & CTL_LLF_FUA) 618 flags |= IO_SYNC; 619 620 bzero(&xuio, sizeof(xuio)); 621 if (beio->bio_cmd == BIO_READ) { 622 SDT_PROBE(cbb, kernel, read, file_start, 0, 0, 0, 0, 0); 623 xuio.uio_rw = UIO_READ; 624 } else { 625 SDT_PROBE(cbb, kernel, write, file_start, 0, 0, 0, 0, 0); 626 xuio.uio_rw = UIO_WRITE; 627 } 628 xuio.uio_offset = beio->io_offset; 629 xuio.uio_resid = beio->io_len; 630 xuio.uio_segflg = UIO_SYSSPACE; 631 xuio.uio_iov = beio->xiovecs; 632 xuio.uio_iovcnt = beio->num_segs; 633 xuio.uio_td = curthread; 634 635 for (i = 0, xiovec = xuio.uio_iov; i < xuio.uio_iovcnt; i++, xiovec++) { 636 xiovec->iov_base = beio->sg_segs[i].addr; 637 xiovec->iov_len = beio->sg_segs[i].len; 638 } 639 640 binuptime(&beio->ds_t0); 641 mtx_lock(&be_lun->io_lock); 642 devstat_start_transaction(beio->lun->disk_stats, &beio->ds_t0); 643 mtx_unlock(&be_lun->io_lock); 644 645 if (beio->bio_cmd == BIO_READ) { 646 vn_lock(be_lun->vn, LK_SHARED | LK_RETRY); 647 648 /* 649 * UFS pays attention to IO_DIRECT for reads. If the 650 * DIRECTIO option is configured into the kernel, it calls 651 * ffs_rawread(). But that only works for single-segment 652 * uios with user space addresses. In our case, with a 653 * kernel uio, it still reads into the buffer cache, but it 654 * will just try to release the buffer from the cache later 655 * on in ffs_read(). 656 * 657 * ZFS does not pay attention to IO_DIRECT for reads. 658 * 659 * UFS does not pay attention to IO_SYNC for reads. 660 * 661 * ZFS pays attention to IO_SYNC (which translates into the 662 * Solaris define FRSYNC for zfs_read()) for reads. It 663 * attempts to sync the file before reading. 664 * 665 * So, to attempt to provide some barrier semantics in the 666 * BIO_ORDERED case, set both IO_DIRECT and IO_SYNC. 667 */ 668 error = VOP_READ(be_lun->vn, &xuio, flags, file_data->cred); 669 670 VOP_UNLOCK(be_lun->vn, 0); 671 SDT_PROBE(cbb, kernel, read, file_done, 0, 0, 0, 0, 0); 672 } else { 673 struct mount *mountpoint; 674 int lock_flags; 675 676 (void)vn_start_write(be_lun->vn, &mountpoint, V_WAIT); 677 678 if (MNT_SHARED_WRITES(mountpoint) 679 || ((mountpoint == NULL) 680 && MNT_SHARED_WRITES(be_lun->vn->v_mount))) 681 lock_flags = LK_SHARED; 682 else 683 lock_flags = LK_EXCLUSIVE; 684 685 vn_lock(be_lun->vn, lock_flags | LK_RETRY); 686 687 /* 688 * UFS pays attention to IO_DIRECT for writes. The write 689 * is done asynchronously. (Normally the write would just 690 * get put into cache. 691 * 692 * UFS pays attention to IO_SYNC for writes. It will 693 * attempt to write the buffer out synchronously if that 694 * flag is set. 695 * 696 * ZFS does not pay attention to IO_DIRECT for writes. 697 * 698 * ZFS pays attention to IO_SYNC (a.k.a. FSYNC or FRSYNC) 699 * for writes. It will flush the transaction from the 700 * cache before returning. 701 * 702 * So if we've got the BIO_ORDERED flag set, we want 703 * IO_SYNC in either the UFS or ZFS case. 704 */ 705 error = VOP_WRITE(be_lun->vn, &xuio, flags, file_data->cred); 706 VOP_UNLOCK(be_lun->vn, 0); 707 708 vn_finished_write(mountpoint); 709 SDT_PROBE(cbb, kernel, write, file_done, 0, 0, 0, 0, 0); 710 } 711 712 mtx_lock(&be_lun->io_lock); 713 devstat_end_transaction(beio->lun->disk_stats, beio->io_len, 714 beio->ds_tag_type, beio->ds_trans_type, 715 /*now*/ NULL, /*then*/&beio->ds_t0); 716 mtx_unlock(&be_lun->io_lock); 717 718 /* 719 * If we got an error, set the sense data to "MEDIUM ERROR" and 720 * return the I/O to the user. 721 */ 722 if (error != 0) { 723 char path_str[32]; 724 725 ctl_scsi_path_string(io, path_str, sizeof(path_str)); 726 printf("%s%s command returned errno %d\n", path_str, 727 (beio->bio_cmd == BIO_READ) ? "READ" : "WRITE", error); 728 if (error == ENOSPC) { 729 ctl_set_space_alloc_fail(&io->scsiio); 730 } else 731 ctl_set_medium_error(&io->scsiio); 732 ctl_complete_beio(beio); 733 return; 734 } 735 736 /* 737 * If this is a write or a verify, we're all done. 738 * If this is a read, we can now send the data to the user. 739 */ 740 if ((beio->bio_cmd == BIO_WRITE) || 741 (ARGS(io)->flags & CTL_LLF_VERIFY)) { 742 ctl_set_success(&io->scsiio); 743 ctl_complete_beio(beio); 744 } else { 745 if ((ARGS(io)->flags & CTL_LLF_READ) && 746 beio->beio_cont == NULL) 747 ctl_set_success(&io->scsiio); 748 #ifdef CTL_TIME_IO 749 getbintime(&io->io_hdr.dma_start_bt); 750 #endif 751 ctl_datamove(io); 752 } 753 } 754 755 static void 756 ctl_be_block_dispatch_zvol(struct ctl_be_block_lun *be_lun, 757 struct ctl_be_block_io *beio) 758 { 759 struct ctl_be_block_devdata *dev_data; 760 union ctl_io *io; 761 struct uio xuio; 762 struct iovec *xiovec; 763 int flags; 764 int error, i; 765 766 DPRINTF("entered\n"); 767 768 dev_data = &be_lun->backend.dev; 769 io = beio->io; 770 flags = 0; 771 if (ARGS(io)->flags & CTL_LLF_DPO) 772 flags |= IO_DIRECT; 773 if (beio->bio_cmd == BIO_WRITE && ARGS(io)->flags & CTL_LLF_FUA) 774 flags |= IO_SYNC; 775 776 bzero(&xuio, sizeof(xuio)); 777 if (beio->bio_cmd == BIO_READ) { 778 SDT_PROBE(cbb, kernel, read, file_start, 0, 0, 0, 0, 0); 779 xuio.uio_rw = UIO_READ; 780 } else { 781 SDT_PROBE(cbb, kernel, write, file_start, 0, 0, 0, 0, 0); 782 xuio.uio_rw = UIO_WRITE; 783 } 784 xuio.uio_offset = beio->io_offset; 785 xuio.uio_resid = beio->io_len; 786 xuio.uio_segflg = UIO_SYSSPACE; 787 xuio.uio_iov = beio->xiovecs; 788 xuio.uio_iovcnt = beio->num_segs; 789 xuio.uio_td = curthread; 790 791 for (i = 0, xiovec = xuio.uio_iov; i < xuio.uio_iovcnt; i++, xiovec++) { 792 xiovec->iov_base = beio->sg_segs[i].addr; 793 xiovec->iov_len = beio->sg_segs[i].len; 794 } 795 796 binuptime(&beio->ds_t0); 797 mtx_lock(&be_lun->io_lock); 798 devstat_start_transaction(beio->lun->disk_stats, &beio->ds_t0); 799 mtx_unlock(&be_lun->io_lock); 800 801 if (beio->bio_cmd == BIO_READ) { 802 error = (*dev_data->csw->d_read)(dev_data->cdev, &xuio, flags); 803 SDT_PROBE(cbb, kernel, read, file_done, 0, 0, 0, 0, 0); 804 } else { 805 error = (*dev_data->csw->d_write)(dev_data->cdev, &xuio, flags); 806 SDT_PROBE(cbb, kernel, write, file_done, 0, 0, 0, 0, 0); 807 } 808 809 mtx_lock(&be_lun->io_lock); 810 devstat_end_transaction(beio->lun->disk_stats, beio->io_len, 811 beio->ds_tag_type, beio->ds_trans_type, 812 /*now*/ NULL, /*then*/&beio->ds_t0); 813 mtx_unlock(&be_lun->io_lock); 814 815 /* 816 * If we got an error, set the sense data to "MEDIUM ERROR" and 817 * return the I/O to the user. 818 */ 819 if (error != 0) { 820 if (error == ENOSPC) { 821 ctl_set_space_alloc_fail(&io->scsiio); 822 } else 823 ctl_set_medium_error(&io->scsiio); 824 ctl_complete_beio(beio); 825 return; 826 } 827 828 /* 829 * If this is a write or a verify, we're all done. 830 * If this is a read, we can now send the data to the user. 831 */ 832 if ((beio->bio_cmd == BIO_WRITE) || 833 (ARGS(io)->flags & CTL_LLF_VERIFY)) { 834 ctl_set_success(&io->scsiio); 835 ctl_complete_beio(beio); 836 } else { 837 if ((ARGS(io)->flags & CTL_LLF_READ) && 838 beio->beio_cont == NULL) 839 ctl_set_success(&io->scsiio); 840 #ifdef CTL_TIME_IO 841 getbintime(&io->io_hdr.dma_start_bt); 842 #endif 843 ctl_datamove(io); 844 } 845 } 846 847 static void 848 ctl_be_block_flush_dev(struct ctl_be_block_lun *be_lun, 849 struct ctl_be_block_io *beio) 850 { 851 struct bio *bio; 852 union ctl_io *io; 853 struct ctl_be_block_devdata *dev_data; 854 855 dev_data = &be_lun->backend.dev; 856 io = beio->io; 857 858 DPRINTF("entered\n"); 859 860 /* This can't fail, it's a blocking allocation. */ 861 bio = g_alloc_bio(); 862 863 bio->bio_cmd = BIO_FLUSH; 864 bio->bio_flags |= BIO_ORDERED; 865 bio->bio_dev = dev_data->cdev; 866 bio->bio_offset = 0; 867 bio->bio_data = 0; 868 bio->bio_done = ctl_be_block_biodone; 869 bio->bio_caller1 = beio; 870 bio->bio_pblkno = 0; 871 872 /* 873 * We don't need to acquire the LUN lock here, because we are only 874 * sending one bio, and so there is no other context to synchronize 875 * with. 876 */ 877 beio->num_bios_sent = 1; 878 beio->send_complete = 1; 879 880 binuptime(&beio->ds_t0); 881 mtx_lock(&be_lun->io_lock); 882 devstat_start_transaction(be_lun->disk_stats, &beio->ds_t0); 883 mtx_unlock(&be_lun->io_lock); 884 885 (*dev_data->csw->d_strategy)(bio); 886 } 887 888 static void 889 ctl_be_block_unmap_dev_range(struct ctl_be_block_lun *be_lun, 890 struct ctl_be_block_io *beio, 891 uint64_t off, uint64_t len, int last) 892 { 893 struct bio *bio; 894 struct ctl_be_block_devdata *dev_data; 895 uint64_t maxlen; 896 897 dev_data = &be_lun->backend.dev; 898 maxlen = LONG_MAX - (LONG_MAX % be_lun->blocksize); 899 while (len > 0) { 900 bio = g_alloc_bio(); 901 bio->bio_cmd = BIO_DELETE; 902 bio->bio_dev = dev_data->cdev; 903 bio->bio_offset = off; 904 bio->bio_length = MIN(len, maxlen); 905 bio->bio_data = 0; 906 bio->bio_done = ctl_be_block_biodone; 907 bio->bio_caller1 = beio; 908 bio->bio_pblkno = off / be_lun->blocksize; 909 910 off += bio->bio_length; 911 len -= bio->bio_length; 912 913 mtx_lock(&be_lun->io_lock); 914 beio->num_bios_sent++; 915 if (last && len == 0) 916 beio->send_complete = 1; 917 mtx_unlock(&be_lun->io_lock); 918 919 (*dev_data->csw->d_strategy)(bio); 920 } 921 } 922 923 static void 924 ctl_be_block_unmap_dev(struct ctl_be_block_lun *be_lun, 925 struct ctl_be_block_io *beio) 926 { 927 union ctl_io *io; 928 struct ctl_be_block_devdata *dev_data; 929 struct ctl_ptr_len_flags *ptrlen; 930 struct scsi_unmap_desc *buf, *end; 931 uint64_t len; 932 933 dev_data = &be_lun->backend.dev; 934 io = beio->io; 935 936 DPRINTF("entered\n"); 937 938 binuptime(&beio->ds_t0); 939 mtx_lock(&be_lun->io_lock); 940 devstat_start_transaction(be_lun->disk_stats, &beio->ds_t0); 941 mtx_unlock(&be_lun->io_lock); 942 943 if (beio->io_offset == -1) { 944 beio->io_len = 0; 945 ptrlen = (struct ctl_ptr_len_flags *)&io->io_hdr.ctl_private[CTL_PRIV_LBA_LEN]; 946 buf = (struct scsi_unmap_desc *)ptrlen->ptr; 947 end = buf + ptrlen->len / sizeof(*buf); 948 for (; buf < end; buf++) { 949 len = (uint64_t)scsi_4btoul(buf->length) * 950 be_lun->blocksize; 951 beio->io_len += len; 952 ctl_be_block_unmap_dev_range(be_lun, beio, 953 scsi_8btou64(buf->lba) * be_lun->blocksize, len, 954 (end - buf < 2) ? TRUE : FALSE); 955 } 956 } else 957 ctl_be_block_unmap_dev_range(be_lun, beio, 958 beio->io_offset, beio->io_len, TRUE); 959 } 960 961 static void 962 ctl_be_block_dispatch_dev(struct ctl_be_block_lun *be_lun, 963 struct ctl_be_block_io *beio) 964 { 965 TAILQ_HEAD(, bio) queue = TAILQ_HEAD_INITIALIZER(queue); 966 int i; 967 struct bio *bio; 968 struct ctl_be_block_devdata *dev_data; 969 off_t cur_offset; 970 int max_iosize; 971 972 DPRINTF("entered\n"); 973 974 dev_data = &be_lun->backend.dev; 975 976 /* 977 * We have to limit our I/O size to the maximum supported by the 978 * backend device. Hopefully it is MAXPHYS. If the driver doesn't 979 * set it properly, use DFLTPHYS. 980 */ 981 max_iosize = dev_data->cdev->si_iosize_max; 982 if (max_iosize < PAGE_SIZE) 983 max_iosize = DFLTPHYS; 984 985 cur_offset = beio->io_offset; 986 for (i = 0; i < beio->num_segs; i++) { 987 size_t cur_size; 988 uint8_t *cur_ptr; 989 990 cur_size = beio->sg_segs[i].len; 991 cur_ptr = beio->sg_segs[i].addr; 992 993 while (cur_size > 0) { 994 /* This can't fail, it's a blocking allocation. */ 995 bio = g_alloc_bio(); 996 997 KASSERT(bio != NULL, ("g_alloc_bio() failed!\n")); 998 999 bio->bio_cmd = beio->bio_cmd; 1000 bio->bio_dev = dev_data->cdev; 1001 bio->bio_caller1 = beio; 1002 bio->bio_length = min(cur_size, max_iosize); 1003 bio->bio_offset = cur_offset; 1004 bio->bio_data = cur_ptr; 1005 bio->bio_done = ctl_be_block_biodone; 1006 bio->bio_pblkno = cur_offset / be_lun->blocksize; 1007 1008 cur_offset += bio->bio_length; 1009 cur_ptr += bio->bio_length; 1010 cur_size -= bio->bio_length; 1011 1012 TAILQ_INSERT_TAIL(&queue, bio, bio_queue); 1013 beio->num_bios_sent++; 1014 } 1015 } 1016 binuptime(&beio->ds_t0); 1017 mtx_lock(&be_lun->io_lock); 1018 devstat_start_transaction(be_lun->disk_stats, &beio->ds_t0); 1019 beio->send_complete = 1; 1020 mtx_unlock(&be_lun->io_lock); 1021 1022 /* 1023 * Fire off all allocated requests! 1024 */ 1025 while ((bio = TAILQ_FIRST(&queue)) != NULL) { 1026 TAILQ_REMOVE(&queue, bio, bio_queue); 1027 (*dev_data->csw->d_strategy)(bio); 1028 } 1029 } 1030 1031 static uint64_t 1032 ctl_be_block_getattr_dev(struct ctl_be_block_lun *be_lun, const char *attrname) 1033 { 1034 struct ctl_be_block_devdata *dev_data = &be_lun->backend.dev; 1035 struct diocgattr_arg arg; 1036 int error; 1037 1038 if (dev_data->csw == NULL || dev_data->csw->d_ioctl == NULL) 1039 return (UINT64_MAX); 1040 strlcpy(arg.name, attrname, sizeof(arg.name)); 1041 arg.len = sizeof(arg.value.off); 1042 error = dev_data->csw->d_ioctl(dev_data->cdev, 1043 DIOCGATTR, (caddr_t)&arg, FREAD, curthread); 1044 if (error != 0) 1045 return (UINT64_MAX); 1046 return (arg.value.off); 1047 } 1048 1049 static void 1050 ctl_be_block_cw_done_ws(struct ctl_be_block_io *beio) 1051 { 1052 union ctl_io *io; 1053 1054 io = beio->io; 1055 ctl_free_beio(beio); 1056 if ((io->io_hdr.flags & CTL_FLAG_ABORT) || 1057 ((io->io_hdr.status & CTL_STATUS_MASK) != CTL_STATUS_NONE && 1058 (io->io_hdr.status & CTL_STATUS_MASK) != CTL_SUCCESS)) { 1059 ctl_config_write_done(io); 1060 return; 1061 } 1062 1063 ctl_be_block_config_write(io); 1064 } 1065 1066 static void 1067 ctl_be_block_cw_dispatch_ws(struct ctl_be_block_lun *be_lun, 1068 union ctl_io *io) 1069 { 1070 struct ctl_be_block_io *beio; 1071 struct ctl_be_block_softc *softc; 1072 struct ctl_lba_len_flags *lbalen; 1073 uint64_t len_left, lba; 1074 int i, seglen; 1075 uint8_t *buf, *end; 1076 1077 DPRINTF("entered\n"); 1078 1079 beio = (struct ctl_be_block_io *)PRIV(io)->ptr; 1080 softc = be_lun->softc; 1081 lbalen = ARGS(beio->io); 1082 1083 if (lbalen->flags & ~(SWS_LBDATA | SWS_UNMAP | SWS_ANCHOR | SWS_NDOB) || 1084 (lbalen->flags & (SWS_UNMAP | SWS_ANCHOR) && be_lun->unmap == NULL)) { 1085 ctl_free_beio(beio); 1086 ctl_set_invalid_field(&io->scsiio, 1087 /*sks_valid*/ 1, 1088 /*command*/ 1, 1089 /*field*/ 1, 1090 /*bit_valid*/ 0, 1091 /*bit*/ 0); 1092 ctl_config_write_done(io); 1093 return; 1094 } 1095 1096 switch (io->scsiio.tag_type) { 1097 case CTL_TAG_ORDERED: 1098 beio->ds_tag_type = DEVSTAT_TAG_ORDERED; 1099 break; 1100 case CTL_TAG_HEAD_OF_QUEUE: 1101 beio->ds_tag_type = DEVSTAT_TAG_HEAD; 1102 break; 1103 case CTL_TAG_UNTAGGED: 1104 case CTL_TAG_SIMPLE: 1105 case CTL_TAG_ACA: 1106 default: 1107 beio->ds_tag_type = DEVSTAT_TAG_SIMPLE; 1108 break; 1109 } 1110 1111 if (lbalen->flags & (SWS_UNMAP | SWS_ANCHOR)) { 1112 beio->io_offset = lbalen->lba * be_lun->blocksize; 1113 beio->io_len = (uint64_t)lbalen->len * be_lun->blocksize; 1114 beio->bio_cmd = BIO_DELETE; 1115 beio->ds_trans_type = DEVSTAT_FREE; 1116 1117 be_lun->unmap(be_lun, beio); 1118 return; 1119 } 1120 1121 beio->bio_cmd = BIO_WRITE; 1122 beio->ds_trans_type = DEVSTAT_WRITE; 1123 1124 DPRINTF("WRITE SAME at LBA %jx len %u\n", 1125 (uintmax_t)lbalen->lba, lbalen->len); 1126 1127 len_left = (uint64_t)lbalen->len * be_lun->blocksize; 1128 for (i = 0, lba = 0; i < CTLBLK_MAX_SEGS && len_left > 0; i++) { 1129 1130 /* 1131 * Setup the S/G entry for this chunk. 1132 */ 1133 seglen = MIN(CTLBLK_MAX_SEG, len_left); 1134 seglen -= seglen % be_lun->blocksize; 1135 beio->sg_segs[i].len = seglen; 1136 beio->sg_segs[i].addr = uma_zalloc(be_lun->lun_zone, M_WAITOK); 1137 1138 DPRINTF("segment %d addr %p len %zd\n", i, 1139 beio->sg_segs[i].addr, beio->sg_segs[i].len); 1140 1141 beio->num_segs++; 1142 len_left -= seglen; 1143 1144 buf = beio->sg_segs[i].addr; 1145 end = buf + seglen; 1146 for (; buf < end; buf += be_lun->blocksize) { 1147 memcpy(buf, io->scsiio.kern_data_ptr, be_lun->blocksize); 1148 if (lbalen->flags & SWS_LBDATA) 1149 scsi_ulto4b(lbalen->lba + lba, buf); 1150 lba++; 1151 } 1152 } 1153 1154 beio->io_offset = lbalen->lba * be_lun->blocksize; 1155 beio->io_len = lba * be_lun->blocksize; 1156 1157 /* We can not do all in one run. Correct and schedule rerun. */ 1158 if (len_left > 0) { 1159 lbalen->lba += lba; 1160 lbalen->len -= lba; 1161 beio->beio_cont = ctl_be_block_cw_done_ws; 1162 } 1163 1164 be_lun->dispatch(be_lun, beio); 1165 } 1166 1167 static void 1168 ctl_be_block_cw_dispatch_unmap(struct ctl_be_block_lun *be_lun, 1169 union ctl_io *io) 1170 { 1171 struct ctl_be_block_io *beio; 1172 struct ctl_be_block_softc *softc; 1173 struct ctl_ptr_len_flags *ptrlen; 1174 1175 DPRINTF("entered\n"); 1176 1177 beio = (struct ctl_be_block_io *)PRIV(io)->ptr; 1178 softc = be_lun->softc; 1179 ptrlen = (struct ctl_ptr_len_flags *)&io->io_hdr.ctl_private[CTL_PRIV_LBA_LEN]; 1180 1181 if ((ptrlen->flags & ~SU_ANCHOR) != 0 || be_lun->unmap == NULL) { 1182 ctl_free_beio(beio); 1183 ctl_set_invalid_field(&io->scsiio, 1184 /*sks_valid*/ 0, 1185 /*command*/ 1, 1186 /*field*/ 0, 1187 /*bit_valid*/ 0, 1188 /*bit*/ 0); 1189 ctl_config_write_done(io); 1190 return; 1191 } 1192 1193 switch (io->scsiio.tag_type) { 1194 case CTL_TAG_ORDERED: 1195 beio->ds_tag_type = DEVSTAT_TAG_ORDERED; 1196 break; 1197 case CTL_TAG_HEAD_OF_QUEUE: 1198 beio->ds_tag_type = DEVSTAT_TAG_HEAD; 1199 break; 1200 case CTL_TAG_UNTAGGED: 1201 case CTL_TAG_SIMPLE: 1202 case CTL_TAG_ACA: 1203 default: 1204 beio->ds_tag_type = DEVSTAT_TAG_SIMPLE; 1205 break; 1206 } 1207 1208 beio->io_len = 0; 1209 beio->io_offset = -1; 1210 1211 beio->bio_cmd = BIO_DELETE; 1212 beio->ds_trans_type = DEVSTAT_FREE; 1213 1214 DPRINTF("UNMAP\n"); 1215 1216 be_lun->unmap(be_lun, beio); 1217 } 1218 1219 static void 1220 ctl_be_block_cw_done(struct ctl_be_block_io *beio) 1221 { 1222 union ctl_io *io; 1223 1224 io = beio->io; 1225 ctl_free_beio(beio); 1226 ctl_config_write_done(io); 1227 } 1228 1229 static void 1230 ctl_be_block_cw_dispatch(struct ctl_be_block_lun *be_lun, 1231 union ctl_io *io) 1232 { 1233 struct ctl_be_block_io *beio; 1234 struct ctl_be_block_softc *softc; 1235 1236 DPRINTF("entered\n"); 1237 1238 softc = be_lun->softc; 1239 beio = ctl_alloc_beio(softc); 1240 beio->io = io; 1241 beio->lun = be_lun; 1242 beio->beio_cont = ctl_be_block_cw_done; 1243 PRIV(io)->ptr = (void *)beio; 1244 1245 switch (io->scsiio.cdb[0]) { 1246 case SYNCHRONIZE_CACHE: 1247 case SYNCHRONIZE_CACHE_16: 1248 beio->bio_cmd = BIO_FLUSH; 1249 beio->ds_trans_type = DEVSTAT_NO_DATA; 1250 beio->ds_tag_type = DEVSTAT_TAG_ORDERED; 1251 beio->io_len = 0; 1252 be_lun->lun_flush(be_lun, beio); 1253 break; 1254 case WRITE_SAME_10: 1255 case WRITE_SAME_16: 1256 ctl_be_block_cw_dispatch_ws(be_lun, io); 1257 break; 1258 case UNMAP: 1259 ctl_be_block_cw_dispatch_unmap(be_lun, io); 1260 break; 1261 default: 1262 panic("Unhandled CDB type %#x", io->scsiio.cdb[0]); 1263 break; 1264 } 1265 } 1266 1267 SDT_PROBE_DEFINE1(cbb, kernel, read, start, "uint64_t"); 1268 SDT_PROBE_DEFINE1(cbb, kernel, write, start, "uint64_t"); 1269 SDT_PROBE_DEFINE1(cbb, kernel, read, alloc_done, "uint64_t"); 1270 SDT_PROBE_DEFINE1(cbb, kernel, write, alloc_done, "uint64_t"); 1271 1272 static void 1273 ctl_be_block_next(struct ctl_be_block_io *beio) 1274 { 1275 struct ctl_be_block_lun *be_lun; 1276 union ctl_io *io; 1277 1278 io = beio->io; 1279 be_lun = beio->lun; 1280 ctl_free_beio(beio); 1281 if ((io->io_hdr.flags & CTL_FLAG_ABORT) || 1282 ((io->io_hdr.status & CTL_STATUS_MASK) != CTL_STATUS_NONE && 1283 (io->io_hdr.status & CTL_STATUS_MASK) != CTL_SUCCESS)) { 1284 ctl_data_submit_done(io); 1285 return; 1286 } 1287 1288 io->io_hdr.status &= ~CTL_STATUS_MASK; 1289 io->io_hdr.status |= CTL_STATUS_NONE; 1290 1291 mtx_lock(&be_lun->queue_lock); 1292 /* 1293 * XXX KDM make sure that links is okay to use at this point. 1294 * Otherwise, we either need to add another field to ctl_io_hdr, 1295 * or deal with resource allocation here. 1296 */ 1297 STAILQ_INSERT_TAIL(&be_lun->input_queue, &io->io_hdr, links); 1298 mtx_unlock(&be_lun->queue_lock); 1299 1300 taskqueue_enqueue(be_lun->io_taskqueue, &be_lun->io_task); 1301 } 1302 1303 static void 1304 ctl_be_block_dispatch(struct ctl_be_block_lun *be_lun, 1305 union ctl_io *io) 1306 { 1307 struct ctl_be_block_io *beio; 1308 struct ctl_be_block_softc *softc; 1309 struct ctl_lba_len_flags *lbalen; 1310 struct ctl_ptr_len_flags *bptrlen; 1311 uint64_t len_left, lbas; 1312 int i; 1313 1314 softc = be_lun->softc; 1315 1316 DPRINTF("entered\n"); 1317 1318 lbalen = ARGS(io); 1319 if (lbalen->flags & CTL_LLF_WRITE) { 1320 SDT_PROBE(cbb, kernel, write, start, 0, 0, 0, 0, 0); 1321 } else { 1322 SDT_PROBE(cbb, kernel, read, start, 0, 0, 0, 0, 0); 1323 } 1324 1325 beio = ctl_alloc_beio(softc); 1326 beio->io = io; 1327 beio->lun = be_lun; 1328 bptrlen = PRIV(io); 1329 bptrlen->ptr = (void *)beio; 1330 1331 switch (io->scsiio.tag_type) { 1332 case CTL_TAG_ORDERED: 1333 beio->ds_tag_type = DEVSTAT_TAG_ORDERED; 1334 break; 1335 case CTL_TAG_HEAD_OF_QUEUE: 1336 beio->ds_tag_type = DEVSTAT_TAG_HEAD; 1337 break; 1338 case CTL_TAG_UNTAGGED: 1339 case CTL_TAG_SIMPLE: 1340 case CTL_TAG_ACA: 1341 default: 1342 beio->ds_tag_type = DEVSTAT_TAG_SIMPLE; 1343 break; 1344 } 1345 1346 if (lbalen->flags & CTL_LLF_WRITE) { 1347 beio->bio_cmd = BIO_WRITE; 1348 beio->ds_trans_type = DEVSTAT_WRITE; 1349 } else { 1350 beio->bio_cmd = BIO_READ; 1351 beio->ds_trans_type = DEVSTAT_READ; 1352 } 1353 1354 DPRINTF("%s at LBA %jx len %u @%ju\n", 1355 (beio->bio_cmd == BIO_READ) ? "READ" : "WRITE", 1356 (uintmax_t)lbalen->lba, lbalen->len, bptrlen->len); 1357 if (lbalen->flags & CTL_LLF_COMPARE) 1358 lbas = CTLBLK_HALF_IO_SIZE; 1359 else 1360 lbas = CTLBLK_MAX_IO_SIZE; 1361 lbas = MIN(lbalen->len - bptrlen->len, lbas / be_lun->blocksize); 1362 beio->io_offset = (lbalen->lba + bptrlen->len) * be_lun->blocksize; 1363 beio->io_len = lbas * be_lun->blocksize; 1364 bptrlen->len += lbas; 1365 1366 for (i = 0, len_left = beio->io_len; len_left > 0; i++) { 1367 KASSERT(i < CTLBLK_MAX_SEGS, ("Too many segs (%d >= %d)", 1368 i, CTLBLK_MAX_SEGS)); 1369 1370 /* 1371 * Setup the S/G entry for this chunk. 1372 */ 1373 beio->sg_segs[i].len = min(CTLBLK_MAX_SEG, len_left); 1374 beio->sg_segs[i].addr = uma_zalloc(be_lun->lun_zone, M_WAITOK); 1375 1376 DPRINTF("segment %d addr %p len %zd\n", i, 1377 beio->sg_segs[i].addr, beio->sg_segs[i].len); 1378 1379 /* Set up second segment for compare operation. */ 1380 if (lbalen->flags & CTL_LLF_COMPARE) { 1381 beio->sg_segs[i + CTLBLK_HALF_SEGS].len = 1382 beio->sg_segs[i].len; 1383 beio->sg_segs[i + CTLBLK_HALF_SEGS].addr = 1384 uma_zalloc(be_lun->lun_zone, M_WAITOK); 1385 } 1386 1387 beio->num_segs++; 1388 len_left -= beio->sg_segs[i].len; 1389 } 1390 if (bptrlen->len < lbalen->len) 1391 beio->beio_cont = ctl_be_block_next; 1392 io->scsiio.be_move_done = ctl_be_block_move_done; 1393 /* For compare we have separate S/G lists for read and datamove. */ 1394 if (lbalen->flags & CTL_LLF_COMPARE) 1395 io->scsiio.kern_data_ptr = (uint8_t *)&beio->sg_segs[CTLBLK_HALF_SEGS]; 1396 else 1397 io->scsiio.kern_data_ptr = (uint8_t *)beio->sg_segs; 1398 io->scsiio.kern_data_len = beio->io_len; 1399 io->scsiio.kern_data_resid = 0; 1400 io->scsiio.kern_sg_entries = beio->num_segs; 1401 io->io_hdr.flags |= CTL_FLAG_ALLOCATED | CTL_FLAG_KDPTR_SGLIST; 1402 1403 /* 1404 * For the read case, we need to read the data into our buffers and 1405 * then we can send it back to the user. For the write case, we 1406 * need to get the data from the user first. 1407 */ 1408 if (beio->bio_cmd == BIO_READ) { 1409 SDT_PROBE(cbb, kernel, read, alloc_done, 0, 0, 0, 0, 0); 1410 be_lun->dispatch(be_lun, beio); 1411 } else { 1412 SDT_PROBE(cbb, kernel, write, alloc_done, 0, 0, 0, 0, 0); 1413 #ifdef CTL_TIME_IO 1414 getbintime(&io->io_hdr.dma_start_bt); 1415 #endif 1416 ctl_datamove(io); 1417 } 1418 } 1419 1420 static void 1421 ctl_be_block_worker(void *context, int pending) 1422 { 1423 struct ctl_be_block_lun *be_lun; 1424 struct ctl_be_block_softc *softc; 1425 union ctl_io *io; 1426 1427 be_lun = (struct ctl_be_block_lun *)context; 1428 softc = be_lun->softc; 1429 1430 DPRINTF("entered\n"); 1431 1432 mtx_lock(&be_lun->queue_lock); 1433 for (;;) { 1434 io = (union ctl_io *)STAILQ_FIRST(&be_lun->datamove_queue); 1435 if (io != NULL) { 1436 struct ctl_be_block_io *beio; 1437 1438 DPRINTF("datamove queue\n"); 1439 1440 STAILQ_REMOVE(&be_lun->datamove_queue, &io->io_hdr, 1441 ctl_io_hdr, links); 1442 1443 mtx_unlock(&be_lun->queue_lock); 1444 1445 beio = (struct ctl_be_block_io *)PRIV(io)->ptr; 1446 1447 be_lun->dispatch(be_lun, beio); 1448 1449 mtx_lock(&be_lun->queue_lock); 1450 continue; 1451 } 1452 io = (union ctl_io *)STAILQ_FIRST(&be_lun->config_write_queue); 1453 if (io != NULL) { 1454 1455 DPRINTF("config write queue\n"); 1456 1457 STAILQ_REMOVE(&be_lun->config_write_queue, &io->io_hdr, 1458 ctl_io_hdr, links); 1459 1460 mtx_unlock(&be_lun->queue_lock); 1461 1462 ctl_be_block_cw_dispatch(be_lun, io); 1463 1464 mtx_lock(&be_lun->queue_lock); 1465 continue; 1466 } 1467 io = (union ctl_io *)STAILQ_FIRST(&be_lun->input_queue); 1468 if (io != NULL) { 1469 DPRINTF("input queue\n"); 1470 1471 STAILQ_REMOVE(&be_lun->input_queue, &io->io_hdr, 1472 ctl_io_hdr, links); 1473 mtx_unlock(&be_lun->queue_lock); 1474 1475 /* 1476 * We must drop the lock, since this routine and 1477 * its children may sleep. 1478 */ 1479 ctl_be_block_dispatch(be_lun, io); 1480 1481 mtx_lock(&be_lun->queue_lock); 1482 continue; 1483 } 1484 1485 /* 1486 * If we get here, there is no work left in the queues, so 1487 * just break out and let the task queue go to sleep. 1488 */ 1489 break; 1490 } 1491 mtx_unlock(&be_lun->queue_lock); 1492 } 1493 1494 /* 1495 * Entry point from CTL to the backend for I/O. We queue everything to a 1496 * work thread, so this just puts the I/O on a queue and wakes up the 1497 * thread. 1498 */ 1499 static int 1500 ctl_be_block_submit(union ctl_io *io) 1501 { 1502 struct ctl_be_block_lun *be_lun; 1503 struct ctl_be_lun *ctl_be_lun; 1504 1505 DPRINTF("entered\n"); 1506 1507 ctl_be_lun = (struct ctl_be_lun *)io->io_hdr.ctl_private[ 1508 CTL_PRIV_BACKEND_LUN].ptr; 1509 be_lun = (struct ctl_be_block_lun *)ctl_be_lun->be_lun; 1510 1511 /* 1512 * Make sure we only get SCSI I/O. 1513 */ 1514 KASSERT(io->io_hdr.io_type == CTL_IO_SCSI, ("Non-SCSI I/O (type " 1515 "%#x) encountered", io->io_hdr.io_type)); 1516 1517 PRIV(io)->len = 0; 1518 1519 mtx_lock(&be_lun->queue_lock); 1520 /* 1521 * XXX KDM make sure that links is okay to use at this point. 1522 * Otherwise, we either need to add another field to ctl_io_hdr, 1523 * or deal with resource allocation here. 1524 */ 1525 STAILQ_INSERT_TAIL(&be_lun->input_queue, &io->io_hdr, links); 1526 mtx_unlock(&be_lun->queue_lock); 1527 taskqueue_enqueue(be_lun->io_taskqueue, &be_lun->io_task); 1528 1529 return (CTL_RETVAL_COMPLETE); 1530 } 1531 1532 static int 1533 ctl_be_block_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, 1534 int flag, struct thread *td) 1535 { 1536 struct ctl_be_block_softc *softc; 1537 int error; 1538 1539 softc = &backend_block_softc; 1540 1541 error = 0; 1542 1543 switch (cmd) { 1544 case CTL_LUN_REQ: { 1545 struct ctl_lun_req *lun_req; 1546 1547 lun_req = (struct ctl_lun_req *)addr; 1548 1549 switch (lun_req->reqtype) { 1550 case CTL_LUNREQ_CREATE: 1551 error = ctl_be_block_create(softc, lun_req); 1552 break; 1553 case CTL_LUNREQ_RM: 1554 error = ctl_be_block_rm(softc, lun_req); 1555 break; 1556 case CTL_LUNREQ_MODIFY: 1557 error = ctl_be_block_modify(softc, lun_req); 1558 break; 1559 default: 1560 lun_req->status = CTL_LUN_ERROR; 1561 snprintf(lun_req->error_str, sizeof(lun_req->error_str), 1562 "invalid LUN request type %d", 1563 lun_req->reqtype); 1564 break; 1565 } 1566 break; 1567 } 1568 default: 1569 error = ENOTTY; 1570 break; 1571 } 1572 1573 return (error); 1574 } 1575 1576 static int 1577 ctl_be_block_open_file(struct ctl_be_block_lun *be_lun, struct ctl_lun_req *req) 1578 { 1579 struct ctl_be_block_filedata *file_data; 1580 struct ctl_lun_create_params *params; 1581 struct vattr vattr; 1582 off_t pss; 1583 int error; 1584 1585 error = 0; 1586 file_data = &be_lun->backend.file; 1587 params = &be_lun->params; 1588 1589 be_lun->dev_type = CTL_BE_BLOCK_FILE; 1590 be_lun->dispatch = ctl_be_block_dispatch_file; 1591 be_lun->lun_flush = ctl_be_block_flush_file; 1592 1593 error = VOP_GETATTR(be_lun->vn, &vattr, curthread->td_ucred); 1594 if (error != 0) { 1595 snprintf(req->error_str, sizeof(req->error_str), 1596 "error calling VOP_GETATTR() for file %s", 1597 be_lun->dev_path); 1598 return (error); 1599 } 1600 1601 /* 1602 * Verify that we have the ability to upgrade to exclusive 1603 * access on this file so we can trap errors at open instead 1604 * of reporting them during first access. 1605 */ 1606 if (VOP_ISLOCKED(be_lun->vn) != LK_EXCLUSIVE) { 1607 vn_lock(be_lun->vn, LK_UPGRADE | LK_RETRY); 1608 if (be_lun->vn->v_iflag & VI_DOOMED) { 1609 error = EBADF; 1610 snprintf(req->error_str, sizeof(req->error_str), 1611 "error locking file %s", be_lun->dev_path); 1612 return (error); 1613 } 1614 } 1615 1616 1617 file_data->cred = crhold(curthread->td_ucred); 1618 if (params->lun_size_bytes != 0) 1619 be_lun->size_bytes = params->lun_size_bytes; 1620 else 1621 be_lun->size_bytes = vattr.va_size; 1622 /* 1623 * We set the multi thread flag for file operations because all 1624 * filesystems (in theory) are capable of allowing multiple readers 1625 * of a file at once. So we want to get the maximum possible 1626 * concurrency. 1627 */ 1628 be_lun->flags |= CTL_BE_BLOCK_LUN_MULTI_THREAD; 1629 1630 /* 1631 * For files we can use any logical block size. Prefer 512 bytes 1632 * for compatibility reasons. If file's vattr.va_blocksize 1633 * (preferred I/O block size) is bigger and multiple to chosen 1634 * logical block size -- report it as physical block size. 1635 */ 1636 if (params->blocksize_bytes != 0) 1637 be_lun->blocksize = params->blocksize_bytes; 1638 else 1639 be_lun->blocksize = 512; 1640 pss = vattr.va_blocksize / be_lun->blocksize; 1641 if ((pss > 0) && (pss * be_lun->blocksize == vattr.va_blocksize) && 1642 ((pss & (pss - 1)) == 0)) { 1643 be_lun->pblockexp = fls(pss) - 1; 1644 be_lun->pblockoff = 0; 1645 } 1646 1647 /* 1648 * Sanity check. The media size has to be at least one 1649 * sector long. 1650 */ 1651 if (be_lun->size_bytes < be_lun->blocksize) { 1652 error = EINVAL; 1653 snprintf(req->error_str, sizeof(req->error_str), 1654 "file %s size %ju < block size %u", be_lun->dev_path, 1655 (uintmax_t)be_lun->size_bytes, be_lun->blocksize); 1656 } 1657 return (error); 1658 } 1659 1660 static int 1661 ctl_be_block_open_dev(struct ctl_be_block_lun *be_lun, struct ctl_lun_req *req) 1662 { 1663 struct ctl_lun_create_params *params; 1664 struct vattr vattr; 1665 struct cdev *dev; 1666 struct cdevsw *devsw; 1667 int error; 1668 off_t ps, pss, po, pos; 1669 1670 params = &be_lun->params; 1671 1672 be_lun->dev_type = CTL_BE_BLOCK_DEV; 1673 be_lun->backend.dev.cdev = be_lun->vn->v_rdev; 1674 be_lun->backend.dev.csw = dev_refthread(be_lun->backend.dev.cdev, 1675 &be_lun->backend.dev.dev_ref); 1676 if (be_lun->backend.dev.csw == NULL) 1677 panic("Unable to retrieve device switch"); 1678 if (strcmp(be_lun->backend.dev.csw->d_name, "zvol") == 0) 1679 be_lun->dispatch = ctl_be_block_dispatch_zvol; 1680 else 1681 be_lun->dispatch = ctl_be_block_dispatch_dev; 1682 be_lun->lun_flush = ctl_be_block_flush_dev; 1683 be_lun->unmap = ctl_be_block_unmap_dev; 1684 be_lun->getattr = ctl_be_block_getattr_dev; 1685 1686 error = VOP_GETATTR(be_lun->vn, &vattr, NOCRED); 1687 if (error) { 1688 snprintf(req->error_str, sizeof(req->error_str), 1689 "error getting vnode attributes for device %s", 1690 be_lun->dev_path); 1691 return (error); 1692 } 1693 1694 dev = be_lun->vn->v_rdev; 1695 devsw = dev->si_devsw; 1696 if (!devsw->d_ioctl) { 1697 snprintf(req->error_str, sizeof(req->error_str), 1698 "no d_ioctl for device %s!", 1699 be_lun->dev_path); 1700 return (ENODEV); 1701 } 1702 1703 error = devsw->d_ioctl(dev, DIOCGSECTORSIZE, 1704 (caddr_t)&be_lun->blocksize, FREAD, 1705 curthread); 1706 if (error) { 1707 snprintf(req->error_str, sizeof(req->error_str), 1708 "error %d returned for DIOCGSECTORSIZE ioctl " 1709 "on %s!", error, be_lun->dev_path); 1710 return (error); 1711 } 1712 1713 /* 1714 * If the user has asked for a blocksize that is greater than the 1715 * backing device's blocksize, we can do it only if the blocksize 1716 * the user is asking for is an even multiple of the underlying 1717 * device's blocksize. 1718 */ 1719 if ((params->blocksize_bytes != 0) 1720 && (params->blocksize_bytes > be_lun->blocksize)) { 1721 uint32_t bs_multiple, tmp_blocksize; 1722 1723 bs_multiple = params->blocksize_bytes / be_lun->blocksize; 1724 1725 tmp_blocksize = bs_multiple * be_lun->blocksize; 1726 1727 if (tmp_blocksize == params->blocksize_bytes) { 1728 be_lun->blocksize = params->blocksize_bytes; 1729 } else { 1730 snprintf(req->error_str, sizeof(req->error_str), 1731 "requested blocksize %u is not an even " 1732 "multiple of backing device blocksize %u", 1733 params->blocksize_bytes, 1734 be_lun->blocksize); 1735 return (EINVAL); 1736 1737 } 1738 } else if ((params->blocksize_bytes != 0) 1739 && (params->blocksize_bytes != be_lun->blocksize)) { 1740 snprintf(req->error_str, sizeof(req->error_str), 1741 "requested blocksize %u < backing device " 1742 "blocksize %u", params->blocksize_bytes, 1743 be_lun->blocksize); 1744 return (EINVAL); 1745 } 1746 1747 error = devsw->d_ioctl(dev, DIOCGMEDIASIZE, 1748 (caddr_t)&be_lun->size_bytes, FREAD, 1749 curthread); 1750 if (error) { 1751 snprintf(req->error_str, sizeof(req->error_str), 1752 "error %d returned for DIOCGMEDIASIZE " 1753 " ioctl on %s!", error, 1754 be_lun->dev_path); 1755 return (error); 1756 } 1757 1758 if (params->lun_size_bytes != 0) { 1759 if (params->lun_size_bytes > be_lun->size_bytes) { 1760 snprintf(req->error_str, sizeof(req->error_str), 1761 "requested LUN size %ju > backing device " 1762 "size %ju", 1763 (uintmax_t)params->lun_size_bytes, 1764 (uintmax_t)be_lun->size_bytes); 1765 return (EINVAL); 1766 } 1767 1768 be_lun->size_bytes = params->lun_size_bytes; 1769 } 1770 1771 error = devsw->d_ioctl(dev, DIOCGSTRIPESIZE, 1772 (caddr_t)&ps, FREAD, curthread); 1773 if (error) 1774 ps = po = 0; 1775 else { 1776 error = devsw->d_ioctl(dev, DIOCGSTRIPEOFFSET, 1777 (caddr_t)&po, FREAD, curthread); 1778 if (error) 1779 po = 0; 1780 } 1781 pss = ps / be_lun->blocksize; 1782 pos = po / be_lun->blocksize; 1783 if ((pss > 0) && (pss * be_lun->blocksize == ps) && (pss >= pos) && 1784 ((pss & (pss - 1)) == 0) && (pos * be_lun->blocksize == po)) { 1785 be_lun->pblockexp = fls(pss) - 1; 1786 be_lun->pblockoff = (pss - pos) % pss; 1787 } 1788 1789 return (0); 1790 } 1791 1792 static int 1793 ctl_be_block_close(struct ctl_be_block_lun *be_lun) 1794 { 1795 DROP_GIANT(); 1796 if (be_lun->vn) { 1797 int flags = FREAD | FWRITE; 1798 1799 switch (be_lun->dev_type) { 1800 case CTL_BE_BLOCK_DEV: 1801 if (be_lun->backend.dev.csw) { 1802 dev_relthread(be_lun->backend.dev.cdev, 1803 be_lun->backend.dev.dev_ref); 1804 be_lun->backend.dev.csw = NULL; 1805 be_lun->backend.dev.cdev = NULL; 1806 } 1807 break; 1808 case CTL_BE_BLOCK_FILE: 1809 break; 1810 case CTL_BE_BLOCK_NONE: 1811 break; 1812 default: 1813 panic("Unexpected backend type."); 1814 break; 1815 } 1816 1817 (void)vn_close(be_lun->vn, flags, NOCRED, curthread); 1818 be_lun->vn = NULL; 1819 1820 switch (be_lun->dev_type) { 1821 case CTL_BE_BLOCK_DEV: 1822 break; 1823 case CTL_BE_BLOCK_FILE: 1824 if (be_lun->backend.file.cred != NULL) { 1825 crfree(be_lun->backend.file.cred); 1826 be_lun->backend.file.cred = NULL; 1827 } 1828 break; 1829 case CTL_BE_BLOCK_NONE: 1830 break; 1831 default: 1832 panic("Unexpected backend type."); 1833 break; 1834 } 1835 be_lun->dev_type = CTL_BE_BLOCK_NONE; 1836 } 1837 PICKUP_GIANT(); 1838 1839 return (0); 1840 } 1841 1842 static int 1843 ctl_be_block_open(struct ctl_be_block_softc *softc, 1844 struct ctl_be_block_lun *be_lun, struct ctl_lun_req *req) 1845 { 1846 struct nameidata nd; 1847 int flags; 1848 int error; 1849 1850 /* 1851 * XXX KDM allow a read-only option? 1852 */ 1853 flags = FREAD | FWRITE; 1854 error = 0; 1855 1856 if (rootvnode == NULL) { 1857 snprintf(req->error_str, sizeof(req->error_str), 1858 "Root filesystem is not mounted"); 1859 return (1); 1860 } 1861 1862 if (!curthread->td_proc->p_fd->fd_cdir) { 1863 curthread->td_proc->p_fd->fd_cdir = rootvnode; 1864 VREF(rootvnode); 1865 } 1866 if (!curthread->td_proc->p_fd->fd_rdir) { 1867 curthread->td_proc->p_fd->fd_rdir = rootvnode; 1868 VREF(rootvnode); 1869 } 1870 if (!curthread->td_proc->p_fd->fd_jdir) { 1871 curthread->td_proc->p_fd->fd_jdir = rootvnode; 1872 VREF(rootvnode); 1873 } 1874 1875 again: 1876 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, be_lun->dev_path, curthread); 1877 error = vn_open(&nd, &flags, 0, NULL); 1878 if (error) { 1879 /* 1880 * This is the only reasonable guess we can make as far as 1881 * path if the user doesn't give us a fully qualified path. 1882 * If they want to specify a file, they need to specify the 1883 * full path. 1884 */ 1885 if (be_lun->dev_path[0] != '/') { 1886 char *dev_path = "/dev/"; 1887 char *dev_name; 1888 1889 /* Try adding device path at beginning of name */ 1890 dev_name = malloc(strlen(be_lun->dev_path) 1891 + strlen(dev_path) + 1, 1892 M_CTLBLK, M_WAITOK); 1893 if (dev_name) { 1894 sprintf(dev_name, "%s%s", dev_path, 1895 be_lun->dev_path); 1896 free(be_lun->dev_path, M_CTLBLK); 1897 be_lun->dev_path = dev_name; 1898 goto again; 1899 } 1900 } 1901 snprintf(req->error_str, sizeof(req->error_str), 1902 "error opening %s: %d", be_lun->dev_path, error); 1903 return (error); 1904 } 1905 1906 NDFREE(&nd, NDF_ONLY_PNBUF); 1907 1908 be_lun->vn = nd.ni_vp; 1909 1910 /* We only support disks and files. */ 1911 if (vn_isdisk(be_lun->vn, &error)) { 1912 error = ctl_be_block_open_dev(be_lun, req); 1913 } else if (be_lun->vn->v_type == VREG) { 1914 error = ctl_be_block_open_file(be_lun, req); 1915 } else { 1916 error = EINVAL; 1917 snprintf(req->error_str, sizeof(req->error_str), 1918 "%s is not a disk or plain file", be_lun->dev_path); 1919 } 1920 VOP_UNLOCK(be_lun->vn, 0); 1921 1922 if (error != 0) { 1923 ctl_be_block_close(be_lun); 1924 return (error); 1925 } 1926 1927 be_lun->blocksize_shift = fls(be_lun->blocksize) - 1; 1928 be_lun->size_blocks = be_lun->size_bytes >> be_lun->blocksize_shift; 1929 1930 return (0); 1931 } 1932 1933 static int 1934 ctl_be_block_create(struct ctl_be_block_softc *softc, struct ctl_lun_req *req) 1935 { 1936 struct ctl_be_block_lun *be_lun; 1937 struct ctl_lun_create_params *params; 1938 char num_thread_str[16]; 1939 char tmpstr[32]; 1940 char *value; 1941 int retval, num_threads, unmap; 1942 int tmp_num_threads; 1943 1944 params = &req->reqdata.create; 1945 retval = 0; 1946 req->status = CTL_LUN_OK; 1947 1948 num_threads = cbb_num_threads; 1949 1950 be_lun = malloc(sizeof(*be_lun), M_CTLBLK, M_ZERO | M_WAITOK); 1951 1952 be_lun->params = req->reqdata.create; 1953 be_lun->softc = softc; 1954 STAILQ_INIT(&be_lun->input_queue); 1955 STAILQ_INIT(&be_lun->config_write_queue); 1956 STAILQ_INIT(&be_lun->datamove_queue); 1957 sprintf(be_lun->lunname, "cblk%d", softc->num_luns); 1958 mtx_init(&be_lun->io_lock, "cblk io lock", NULL, MTX_DEF); 1959 mtx_init(&be_lun->queue_lock, "cblk queue lock", NULL, MTX_DEF); 1960 ctl_init_opts(&be_lun->ctl_be_lun.options, 1961 req->num_be_args, req->kern_be_args); 1962 1963 be_lun->lun_zone = uma_zcreate(be_lun->lunname, CTLBLK_MAX_SEG, 1964 NULL, NULL, NULL, NULL, /*align*/ 0, /*flags*/0); 1965 1966 if (be_lun->lun_zone == NULL) { 1967 snprintf(req->error_str, sizeof(req->error_str), 1968 "error allocating UMA zone"); 1969 goto bailout_error; 1970 } 1971 1972 if (params->flags & CTL_LUN_FLAG_DEV_TYPE) 1973 be_lun->ctl_be_lun.lun_type = params->device_type; 1974 else 1975 be_lun->ctl_be_lun.lun_type = T_DIRECT; 1976 1977 if (be_lun->ctl_be_lun.lun_type == T_DIRECT) { 1978 value = ctl_get_opt(&be_lun->ctl_be_lun.options, "file"); 1979 if (value == NULL) { 1980 snprintf(req->error_str, sizeof(req->error_str), 1981 "no file argument specified"); 1982 goto bailout_error; 1983 } 1984 be_lun->dev_path = strdup(value, M_CTLBLK); 1985 be_lun->blocksize = 512; 1986 be_lun->blocksize_shift = fls(be_lun->blocksize) - 1; 1987 1988 retval = ctl_be_block_open(softc, be_lun, req); 1989 if (retval != 0) { 1990 retval = 0; 1991 req->status = CTL_LUN_WARNING; 1992 } 1993 } else { 1994 /* 1995 * For processor devices, we don't have any size. 1996 */ 1997 be_lun->blocksize = 0; 1998 be_lun->pblockexp = 0; 1999 be_lun->pblockoff = 0; 2000 be_lun->size_blocks = 0; 2001 be_lun->size_bytes = 0; 2002 be_lun->ctl_be_lun.maxlba = 0; 2003 2004 /* 2005 * Default to just 1 thread for processor devices. 2006 */ 2007 num_threads = 1; 2008 } 2009 2010 /* 2011 * XXX This searching loop might be refactored to be combined with 2012 * the loop above, 2013 */ 2014 value = ctl_get_opt(&be_lun->ctl_be_lun.options, "num_threads"); 2015 if (value != NULL) { 2016 tmp_num_threads = strtol(value, NULL, 0); 2017 2018 /* 2019 * We don't let the user specify less than one 2020 * thread, but hope he's clueful enough not to 2021 * specify 1000 threads. 2022 */ 2023 if (tmp_num_threads < 1) { 2024 snprintf(req->error_str, sizeof(req->error_str), 2025 "invalid number of threads %s", 2026 num_thread_str); 2027 goto bailout_error; 2028 } 2029 num_threads = tmp_num_threads; 2030 } 2031 unmap = (be_lun->dispatch == ctl_be_block_dispatch_zvol); 2032 value = ctl_get_opt(&be_lun->ctl_be_lun.options, "unmap"); 2033 if (value != NULL) 2034 unmap = (strcmp(value, "on") == 0); 2035 2036 be_lun->flags = CTL_BE_BLOCK_LUN_UNCONFIGURED; 2037 be_lun->ctl_be_lun.flags = CTL_LUN_FLAG_PRIMARY; 2038 if (be_lun->vn == NULL) 2039 be_lun->ctl_be_lun.flags |= CTL_LUN_FLAG_OFFLINE; 2040 if (unmap) 2041 be_lun->ctl_be_lun.flags |= CTL_LUN_FLAG_UNMAP; 2042 be_lun->ctl_be_lun.be_lun = be_lun; 2043 be_lun->ctl_be_lun.maxlba = (be_lun->size_blocks == 0) ? 2044 0 : (be_lun->size_blocks - 1); 2045 be_lun->ctl_be_lun.blocksize = be_lun->blocksize; 2046 be_lun->ctl_be_lun.pblockexp = be_lun->pblockexp; 2047 be_lun->ctl_be_lun.pblockoff = be_lun->pblockoff; 2048 if (be_lun->dispatch == ctl_be_block_dispatch_zvol && 2049 be_lun->blocksize != 0) 2050 be_lun->ctl_be_lun.atomicblock = CTLBLK_MAX_IO_SIZE / 2051 be_lun->blocksize; 2052 /* Tell the user the blocksize we ended up using */ 2053 params->lun_size_bytes = be_lun->size_bytes; 2054 params->blocksize_bytes = be_lun->blocksize; 2055 if (params->flags & CTL_LUN_FLAG_ID_REQ) { 2056 be_lun->ctl_be_lun.req_lun_id = params->req_lun_id; 2057 be_lun->ctl_be_lun.flags |= CTL_LUN_FLAG_ID_REQ; 2058 } else 2059 be_lun->ctl_be_lun.req_lun_id = 0; 2060 2061 be_lun->ctl_be_lun.lun_shutdown = ctl_be_block_lun_shutdown; 2062 be_lun->ctl_be_lun.lun_config_status = 2063 ctl_be_block_lun_config_status; 2064 be_lun->ctl_be_lun.be = &ctl_be_block_driver; 2065 2066 if ((params->flags & CTL_LUN_FLAG_SERIAL_NUM) == 0) { 2067 snprintf(tmpstr, sizeof(tmpstr), "MYSERIAL%4d", 2068 softc->num_luns); 2069 strncpy((char *)be_lun->ctl_be_lun.serial_num, tmpstr, 2070 ctl_min(sizeof(be_lun->ctl_be_lun.serial_num), 2071 sizeof(tmpstr))); 2072 2073 /* Tell the user what we used for a serial number */ 2074 strncpy((char *)params->serial_num, tmpstr, 2075 ctl_min(sizeof(params->serial_num), sizeof(tmpstr))); 2076 } else { 2077 strncpy((char *)be_lun->ctl_be_lun.serial_num, 2078 params->serial_num, 2079 ctl_min(sizeof(be_lun->ctl_be_lun.serial_num), 2080 sizeof(params->serial_num))); 2081 } 2082 if ((params->flags & CTL_LUN_FLAG_DEVID) == 0) { 2083 snprintf(tmpstr, sizeof(tmpstr), "MYDEVID%4d", softc->num_luns); 2084 strncpy((char *)be_lun->ctl_be_lun.device_id, tmpstr, 2085 ctl_min(sizeof(be_lun->ctl_be_lun.device_id), 2086 sizeof(tmpstr))); 2087 2088 /* Tell the user what we used for a device ID */ 2089 strncpy((char *)params->device_id, tmpstr, 2090 ctl_min(sizeof(params->device_id), sizeof(tmpstr))); 2091 } else { 2092 strncpy((char *)be_lun->ctl_be_lun.device_id, 2093 params->device_id, 2094 ctl_min(sizeof(be_lun->ctl_be_lun.device_id), 2095 sizeof(params->device_id))); 2096 } 2097 2098 TASK_INIT(&be_lun->io_task, /*priority*/0, ctl_be_block_worker, be_lun); 2099 2100 be_lun->io_taskqueue = taskqueue_create(be_lun->lunname, M_WAITOK, 2101 taskqueue_thread_enqueue, /*context*/&be_lun->io_taskqueue); 2102 2103 if (be_lun->io_taskqueue == NULL) { 2104 snprintf(req->error_str, sizeof(req->error_str), 2105 "unable to create taskqueue"); 2106 goto bailout_error; 2107 } 2108 2109 /* 2110 * Note that we start the same number of threads by default for 2111 * both the file case and the block device case. For the file 2112 * case, we need multiple threads to allow concurrency, because the 2113 * vnode interface is designed to be a blocking interface. For the 2114 * block device case, ZFS zvols at least will block the caller's 2115 * context in many instances, and so we need multiple threads to 2116 * overcome that problem. Other block devices don't need as many 2117 * threads, but they shouldn't cause too many problems. 2118 * 2119 * If the user wants to just have a single thread for a block 2120 * device, he can specify that when the LUN is created, or change 2121 * the tunable/sysctl to alter the default number of threads. 2122 */ 2123 retval = taskqueue_start_threads(&be_lun->io_taskqueue, 2124 /*num threads*/num_threads, 2125 /*priority*/PWAIT, 2126 /*thread name*/ 2127 "%s taskq", be_lun->lunname); 2128 2129 if (retval != 0) 2130 goto bailout_error; 2131 2132 be_lun->num_threads = num_threads; 2133 2134 mtx_lock(&softc->lock); 2135 softc->num_luns++; 2136 STAILQ_INSERT_TAIL(&softc->lun_list, be_lun, links); 2137 2138 mtx_unlock(&softc->lock); 2139 2140 retval = ctl_add_lun(&be_lun->ctl_be_lun); 2141 if (retval != 0) { 2142 mtx_lock(&softc->lock); 2143 STAILQ_REMOVE(&softc->lun_list, be_lun, ctl_be_block_lun, 2144 links); 2145 softc->num_luns--; 2146 mtx_unlock(&softc->lock); 2147 snprintf(req->error_str, sizeof(req->error_str), 2148 "ctl_add_lun() returned error %d, see dmesg for " 2149 "details", retval); 2150 retval = 0; 2151 goto bailout_error; 2152 } 2153 2154 mtx_lock(&softc->lock); 2155 2156 /* 2157 * Tell the config_status routine that we're waiting so it won't 2158 * clean up the LUN in the event of an error. 2159 */ 2160 be_lun->flags |= CTL_BE_BLOCK_LUN_WAITING; 2161 2162 while (be_lun->flags & CTL_BE_BLOCK_LUN_UNCONFIGURED) { 2163 retval = msleep(be_lun, &softc->lock, PCATCH, "ctlblk", 0); 2164 if (retval == EINTR) 2165 break; 2166 } 2167 be_lun->flags &= ~CTL_BE_BLOCK_LUN_WAITING; 2168 2169 if (be_lun->flags & CTL_BE_BLOCK_LUN_CONFIG_ERR) { 2170 snprintf(req->error_str, sizeof(req->error_str), 2171 "LUN configuration error, see dmesg for details"); 2172 STAILQ_REMOVE(&softc->lun_list, be_lun, ctl_be_block_lun, 2173 links); 2174 softc->num_luns--; 2175 mtx_unlock(&softc->lock); 2176 goto bailout_error; 2177 } else { 2178 params->req_lun_id = be_lun->ctl_be_lun.lun_id; 2179 } 2180 2181 mtx_unlock(&softc->lock); 2182 2183 be_lun->disk_stats = devstat_new_entry("cbb", params->req_lun_id, 2184 be_lun->blocksize, 2185 DEVSTAT_ALL_SUPPORTED, 2186 be_lun->ctl_be_lun.lun_type 2187 | DEVSTAT_TYPE_IF_OTHER, 2188 DEVSTAT_PRIORITY_OTHER); 2189 2190 return (retval); 2191 2192 bailout_error: 2193 req->status = CTL_LUN_ERROR; 2194 2195 if (be_lun->io_taskqueue != NULL) 2196 taskqueue_free(be_lun->io_taskqueue); 2197 ctl_be_block_close(be_lun); 2198 if (be_lun->dev_path != NULL) 2199 free(be_lun->dev_path, M_CTLBLK); 2200 if (be_lun->lun_zone != NULL) 2201 uma_zdestroy(be_lun->lun_zone); 2202 ctl_free_opts(&be_lun->ctl_be_lun.options); 2203 mtx_destroy(&be_lun->queue_lock); 2204 mtx_destroy(&be_lun->io_lock); 2205 free(be_lun, M_CTLBLK); 2206 2207 return (retval); 2208 } 2209 2210 static int 2211 ctl_be_block_rm(struct ctl_be_block_softc *softc, struct ctl_lun_req *req) 2212 { 2213 struct ctl_lun_rm_params *params; 2214 struct ctl_be_block_lun *be_lun; 2215 int retval; 2216 2217 params = &req->reqdata.rm; 2218 2219 mtx_lock(&softc->lock); 2220 2221 be_lun = NULL; 2222 2223 STAILQ_FOREACH(be_lun, &softc->lun_list, links) { 2224 if (be_lun->ctl_be_lun.lun_id == params->lun_id) 2225 break; 2226 } 2227 mtx_unlock(&softc->lock); 2228 2229 if (be_lun == NULL) { 2230 snprintf(req->error_str, sizeof(req->error_str), 2231 "LUN %u is not managed by the block backend", 2232 params->lun_id); 2233 goto bailout_error; 2234 } 2235 2236 retval = ctl_disable_lun(&be_lun->ctl_be_lun); 2237 2238 if (retval != 0) { 2239 snprintf(req->error_str, sizeof(req->error_str), 2240 "error %d returned from ctl_disable_lun() for " 2241 "LUN %d", retval, params->lun_id); 2242 goto bailout_error; 2243 2244 } 2245 2246 retval = ctl_invalidate_lun(&be_lun->ctl_be_lun); 2247 if (retval != 0) { 2248 snprintf(req->error_str, sizeof(req->error_str), 2249 "error %d returned from ctl_invalidate_lun() for " 2250 "LUN %d", retval, params->lun_id); 2251 goto bailout_error; 2252 } 2253 2254 mtx_lock(&softc->lock); 2255 2256 be_lun->flags |= CTL_BE_BLOCK_LUN_WAITING; 2257 2258 while ((be_lun->flags & CTL_BE_BLOCK_LUN_UNCONFIGURED) == 0) { 2259 retval = msleep(be_lun, &softc->lock, PCATCH, "ctlblk", 0); 2260 if (retval == EINTR) 2261 break; 2262 } 2263 2264 be_lun->flags &= ~CTL_BE_BLOCK_LUN_WAITING; 2265 2266 if ((be_lun->flags & CTL_BE_BLOCK_LUN_UNCONFIGURED) == 0) { 2267 snprintf(req->error_str, sizeof(req->error_str), 2268 "interrupted waiting for LUN to be freed"); 2269 mtx_unlock(&softc->lock); 2270 goto bailout_error; 2271 } 2272 2273 STAILQ_REMOVE(&softc->lun_list, be_lun, ctl_be_block_lun, links); 2274 2275 softc->num_luns--; 2276 mtx_unlock(&softc->lock); 2277 2278 taskqueue_drain(be_lun->io_taskqueue, &be_lun->io_task); 2279 2280 taskqueue_free(be_lun->io_taskqueue); 2281 2282 ctl_be_block_close(be_lun); 2283 2284 if (be_lun->disk_stats != NULL) 2285 devstat_remove_entry(be_lun->disk_stats); 2286 2287 uma_zdestroy(be_lun->lun_zone); 2288 2289 ctl_free_opts(&be_lun->ctl_be_lun.options); 2290 free(be_lun->dev_path, M_CTLBLK); 2291 mtx_destroy(&be_lun->queue_lock); 2292 mtx_destroy(&be_lun->io_lock); 2293 free(be_lun, M_CTLBLK); 2294 2295 req->status = CTL_LUN_OK; 2296 2297 return (0); 2298 2299 bailout_error: 2300 2301 req->status = CTL_LUN_ERROR; 2302 2303 return (0); 2304 } 2305 2306 static int 2307 ctl_be_block_modify_file(struct ctl_be_block_lun *be_lun, 2308 struct ctl_lun_req *req) 2309 { 2310 struct vattr vattr; 2311 int error; 2312 struct ctl_lun_create_params *params = &be_lun->params; 2313 2314 if (params->lun_size_bytes != 0) { 2315 be_lun->size_bytes = params->lun_size_bytes; 2316 } else { 2317 vn_lock(be_lun->vn, LK_SHARED | LK_RETRY); 2318 error = VOP_GETATTR(be_lun->vn, &vattr, curthread->td_ucred); 2319 VOP_UNLOCK(be_lun->vn, 0); 2320 if (error != 0) { 2321 snprintf(req->error_str, sizeof(req->error_str), 2322 "error calling VOP_GETATTR() for file %s", 2323 be_lun->dev_path); 2324 return (error); 2325 } 2326 2327 be_lun->size_bytes = vattr.va_size; 2328 } 2329 2330 return (0); 2331 } 2332 2333 static int 2334 ctl_be_block_modify_dev(struct ctl_be_block_lun *be_lun, 2335 struct ctl_lun_req *req) 2336 { 2337 struct ctl_be_block_devdata *dev_data; 2338 int error; 2339 struct ctl_lun_create_params *params = &be_lun->params; 2340 uint64_t size_bytes; 2341 2342 dev_data = &be_lun->backend.dev; 2343 if (!dev_data->csw->d_ioctl) { 2344 snprintf(req->error_str, sizeof(req->error_str), 2345 "no d_ioctl for device %s!", be_lun->dev_path); 2346 return (ENODEV); 2347 } 2348 2349 error = dev_data->csw->d_ioctl(dev_data->cdev, DIOCGMEDIASIZE, 2350 (caddr_t)&size_bytes, FREAD, 2351 curthread); 2352 if (error) { 2353 snprintf(req->error_str, sizeof(req->error_str), 2354 "error %d returned for DIOCGMEDIASIZE ioctl " 2355 "on %s!", error, be_lun->dev_path); 2356 return (error); 2357 } 2358 2359 if (params->lun_size_bytes != 0) { 2360 if (params->lun_size_bytes > size_bytes) { 2361 snprintf(req->error_str, sizeof(req->error_str), 2362 "requested LUN size %ju > backing device " 2363 "size %ju", 2364 (uintmax_t)params->lun_size_bytes, 2365 (uintmax_t)size_bytes); 2366 return (EINVAL); 2367 } 2368 2369 be_lun->size_bytes = params->lun_size_bytes; 2370 } else { 2371 be_lun->size_bytes = size_bytes; 2372 } 2373 2374 return (0); 2375 } 2376 2377 static int 2378 ctl_be_block_modify(struct ctl_be_block_softc *softc, struct ctl_lun_req *req) 2379 { 2380 struct ctl_lun_modify_params *params; 2381 struct ctl_be_block_lun *be_lun; 2382 uint64_t oldsize; 2383 int error; 2384 2385 params = &req->reqdata.modify; 2386 2387 mtx_lock(&softc->lock); 2388 be_lun = NULL; 2389 STAILQ_FOREACH(be_lun, &softc->lun_list, links) { 2390 if (be_lun->ctl_be_lun.lun_id == params->lun_id) 2391 break; 2392 } 2393 mtx_unlock(&softc->lock); 2394 2395 if (be_lun == NULL) { 2396 snprintf(req->error_str, sizeof(req->error_str), 2397 "LUN %u is not managed by the block backend", 2398 params->lun_id); 2399 goto bailout_error; 2400 } 2401 2402 be_lun->params.lun_size_bytes = params->lun_size_bytes; 2403 2404 oldsize = be_lun->size_bytes; 2405 if (be_lun->vn == NULL) 2406 error = ctl_be_block_open(softc, be_lun, req); 2407 else if (be_lun->vn->v_type == VREG) 2408 error = ctl_be_block_modify_file(be_lun, req); 2409 else 2410 error = ctl_be_block_modify_dev(be_lun, req); 2411 2412 if (error == 0 && be_lun->size_bytes != oldsize) { 2413 be_lun->size_blocks = be_lun->size_bytes >> 2414 be_lun->blocksize_shift; 2415 2416 /* 2417 * The maximum LBA is the size - 1. 2418 * 2419 * XXX: Note that this field is being updated without locking, 2420 * which might cause problems on 32-bit architectures. 2421 */ 2422 be_lun->ctl_be_lun.maxlba = (be_lun->size_blocks == 0) ? 2423 0 : (be_lun->size_blocks - 1); 2424 be_lun->ctl_be_lun.blocksize = be_lun->blocksize; 2425 be_lun->ctl_be_lun.pblockexp = be_lun->pblockexp; 2426 be_lun->ctl_be_lun.pblockoff = be_lun->pblockoff; 2427 if (be_lun->dispatch == ctl_be_block_dispatch_zvol && 2428 be_lun->blocksize != 0) 2429 be_lun->ctl_be_lun.atomicblock = CTLBLK_MAX_IO_SIZE / 2430 be_lun->blocksize; 2431 ctl_lun_capacity_changed(&be_lun->ctl_be_lun); 2432 if (oldsize == 0 && be_lun->size_blocks != 0) 2433 ctl_lun_online(&be_lun->ctl_be_lun); 2434 } 2435 2436 /* Tell the user the exact size we ended up using */ 2437 params->lun_size_bytes = be_lun->size_bytes; 2438 2439 req->status = error ? CTL_LUN_WARNING : CTL_LUN_OK; 2440 2441 return (0); 2442 2443 bailout_error: 2444 req->status = CTL_LUN_ERROR; 2445 2446 return (0); 2447 } 2448 2449 static void 2450 ctl_be_block_lun_shutdown(void *be_lun) 2451 { 2452 struct ctl_be_block_lun *lun; 2453 struct ctl_be_block_softc *softc; 2454 2455 lun = (struct ctl_be_block_lun *)be_lun; 2456 2457 softc = lun->softc; 2458 2459 mtx_lock(&softc->lock); 2460 lun->flags |= CTL_BE_BLOCK_LUN_UNCONFIGURED; 2461 if (lun->flags & CTL_BE_BLOCK_LUN_WAITING) 2462 wakeup(lun); 2463 mtx_unlock(&softc->lock); 2464 2465 } 2466 2467 static void 2468 ctl_be_block_lun_config_status(void *be_lun, ctl_lun_config_status status) 2469 { 2470 struct ctl_be_block_lun *lun; 2471 struct ctl_be_block_softc *softc; 2472 2473 lun = (struct ctl_be_block_lun *)be_lun; 2474 softc = lun->softc; 2475 2476 if (status == CTL_LUN_CONFIG_OK) { 2477 mtx_lock(&softc->lock); 2478 lun->flags &= ~CTL_BE_BLOCK_LUN_UNCONFIGURED; 2479 if (lun->flags & CTL_BE_BLOCK_LUN_WAITING) 2480 wakeup(lun); 2481 mtx_unlock(&softc->lock); 2482 2483 /* 2484 * We successfully added the LUN, attempt to enable it. 2485 */ 2486 if (ctl_enable_lun(&lun->ctl_be_lun) != 0) { 2487 printf("%s: ctl_enable_lun() failed!\n", __func__); 2488 if (ctl_invalidate_lun(&lun->ctl_be_lun) != 0) { 2489 printf("%s: ctl_invalidate_lun() failed!\n", 2490 __func__); 2491 } 2492 } 2493 2494 return; 2495 } 2496 2497 2498 mtx_lock(&softc->lock); 2499 lun->flags &= ~CTL_BE_BLOCK_LUN_UNCONFIGURED; 2500 lun->flags |= CTL_BE_BLOCK_LUN_CONFIG_ERR; 2501 wakeup(lun); 2502 mtx_unlock(&softc->lock); 2503 } 2504 2505 2506 static int 2507 ctl_be_block_config_write(union ctl_io *io) 2508 { 2509 struct ctl_be_block_lun *be_lun; 2510 struct ctl_be_lun *ctl_be_lun; 2511 int retval; 2512 2513 retval = 0; 2514 2515 DPRINTF("entered\n"); 2516 2517 ctl_be_lun = (struct ctl_be_lun *)io->io_hdr.ctl_private[ 2518 CTL_PRIV_BACKEND_LUN].ptr; 2519 be_lun = (struct ctl_be_block_lun *)ctl_be_lun->be_lun; 2520 2521 switch (io->scsiio.cdb[0]) { 2522 case SYNCHRONIZE_CACHE: 2523 case SYNCHRONIZE_CACHE_16: 2524 case WRITE_SAME_10: 2525 case WRITE_SAME_16: 2526 case UNMAP: 2527 /* 2528 * The upper level CTL code will filter out any CDBs with 2529 * the immediate bit set and return the proper error. 2530 * 2531 * We don't really need to worry about what LBA range the 2532 * user asked to be synced out. When they issue a sync 2533 * cache command, we'll sync out the whole thing. 2534 */ 2535 mtx_lock(&be_lun->queue_lock); 2536 STAILQ_INSERT_TAIL(&be_lun->config_write_queue, &io->io_hdr, 2537 links); 2538 mtx_unlock(&be_lun->queue_lock); 2539 taskqueue_enqueue(be_lun->io_taskqueue, &be_lun->io_task); 2540 break; 2541 case START_STOP_UNIT: { 2542 struct scsi_start_stop_unit *cdb; 2543 2544 cdb = (struct scsi_start_stop_unit *)io->scsiio.cdb; 2545 2546 if (cdb->how & SSS_START) 2547 retval = ctl_start_lun(ctl_be_lun); 2548 else { 2549 retval = ctl_stop_lun(ctl_be_lun); 2550 /* 2551 * XXX KDM Copan-specific offline behavior. 2552 * Figure out a reasonable way to port this? 2553 */ 2554 #ifdef NEEDTOPORT 2555 if ((retval == 0) 2556 && (cdb->byte2 & SSS_ONOFFLINE)) 2557 retval = ctl_lun_offline(ctl_be_lun); 2558 #endif 2559 } 2560 2561 /* 2562 * In general, the above routines should not fail. They 2563 * just set state for the LUN. So we've got something 2564 * pretty wrong here if we can't start or stop the LUN. 2565 */ 2566 if (retval != 0) { 2567 ctl_set_internal_failure(&io->scsiio, 2568 /*sks_valid*/ 1, 2569 /*retry_count*/ 0xf051); 2570 retval = CTL_RETVAL_COMPLETE; 2571 } else { 2572 ctl_set_success(&io->scsiio); 2573 } 2574 ctl_config_write_done(io); 2575 break; 2576 } 2577 default: 2578 ctl_set_invalid_opcode(&io->scsiio); 2579 ctl_config_write_done(io); 2580 retval = CTL_RETVAL_COMPLETE; 2581 break; 2582 } 2583 2584 return (retval); 2585 2586 } 2587 2588 static int 2589 ctl_be_block_config_read(union ctl_io *io) 2590 { 2591 return (0); 2592 } 2593 2594 static int 2595 ctl_be_block_lun_info(void *be_lun, struct sbuf *sb) 2596 { 2597 struct ctl_be_block_lun *lun; 2598 int retval; 2599 2600 lun = (struct ctl_be_block_lun *)be_lun; 2601 retval = 0; 2602 2603 retval = sbuf_printf(sb, "\t<num_threads>"); 2604 2605 if (retval != 0) 2606 goto bailout; 2607 2608 retval = sbuf_printf(sb, "%d", lun->num_threads); 2609 2610 if (retval != 0) 2611 goto bailout; 2612 2613 retval = sbuf_printf(sb, "</num_threads>\n"); 2614 2615 bailout: 2616 2617 return (retval); 2618 } 2619 2620 static uint64_t 2621 ctl_be_block_lun_attr(void *be_lun, const char *attrname) 2622 { 2623 struct ctl_be_block_lun *lun = (struct ctl_be_block_lun *)be_lun; 2624 2625 if (lun->getattr == NULL) 2626 return (UINT64_MAX); 2627 return (lun->getattr(lun, attrname)); 2628 } 2629 2630 int 2631 ctl_be_block_init(void) 2632 { 2633 struct ctl_be_block_softc *softc; 2634 int retval; 2635 2636 softc = &backend_block_softc; 2637 retval = 0; 2638 2639 mtx_init(&softc->lock, "ctlblock", NULL, MTX_DEF); 2640 beio_zone = uma_zcreate("beio", sizeof(struct ctl_be_block_io), 2641 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 2642 STAILQ_INIT(&softc->disk_list); 2643 STAILQ_INIT(&softc->lun_list); 2644 2645 return (retval); 2646 } 2647