ctl_backend_block.c revision 259304
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: stable/10/sys/cam/ctl/ctl_backend_block.c 259304 2013-12-13 15:19:37Z trasz $"); 44 45#include <opt_kdtrace.h> 46 47#include <sys/param.h> 48#include <sys/systm.h> 49#include <sys/kernel.h> 50#include <sys/types.h> 51#include <sys/kthread.h> 52#include <sys/bio.h> 53#include <sys/fcntl.h> 54#include <sys/lock.h> 55#include <sys/mutex.h> 56#include <sys/condvar.h> 57#include <sys/malloc.h> 58#include <sys/conf.h> 59#include <sys/ioccom.h> 60#include <sys/queue.h> 61#include <sys/sbuf.h> 62#include <sys/endian.h> 63#include <sys/uio.h> 64#include <sys/buf.h> 65#include <sys/taskqueue.h> 66#include <sys/vnode.h> 67#include <sys/namei.h> 68#include <sys/mount.h> 69#include <sys/disk.h> 70#include <sys/fcntl.h> 71#include <sys/filedesc.h> 72#include <sys/proc.h> 73#include <sys/pcpu.h> 74#include <sys/module.h> 75#include <sys/sdt.h> 76#include <sys/devicestat.h> 77#include <sys/sysctl.h> 78 79#include <geom/geom.h> 80 81#include <cam/cam.h> 82#include <cam/scsi/scsi_all.h> 83#include <cam/scsi/scsi_da.h> 84#include <cam/ctl/ctl_io.h> 85#include <cam/ctl/ctl.h> 86#include <cam/ctl/ctl_backend.h> 87#include <cam/ctl/ctl_frontend_internal.h> 88#include <cam/ctl/ctl_ioctl.h> 89#include <cam/ctl/ctl_scsi_all.h> 90#include <cam/ctl/ctl_error.h> 91 92/* 93 * The idea here is that we'll allocate enough S/G space to hold a 16MB 94 * I/O. If we get an I/O larger than that, we'll reject it. 95 */ 96#define CTLBLK_MAX_IO_SIZE (16 * 1024 * 1024) 97#define CTLBLK_MAX_SEGS (CTLBLK_MAX_IO_SIZE / MAXPHYS) + 1 98 99#ifdef CTLBLK_DEBUG 100#define DPRINTF(fmt, args...) \ 101 printf("cbb(%s:%d): " fmt, __FUNCTION__, __LINE__, ##args) 102#else 103#define DPRINTF(fmt, args...) do {} while(0) 104#endif 105 106SDT_PROVIDER_DEFINE(cbb); 107 108typedef enum { 109 CTL_BE_BLOCK_LUN_UNCONFIGURED = 0x01, 110 CTL_BE_BLOCK_LUN_CONFIG_ERR = 0x02, 111 CTL_BE_BLOCK_LUN_WAITING = 0x04, 112 CTL_BE_BLOCK_LUN_MULTI_THREAD = 0x08 113} ctl_be_block_lun_flags; 114 115typedef enum { 116 CTL_BE_BLOCK_NONE, 117 CTL_BE_BLOCK_DEV, 118 CTL_BE_BLOCK_FILE 119} ctl_be_block_type; 120 121struct ctl_be_block_devdata { 122 struct cdev *cdev; 123 struct cdevsw *csw; 124 int dev_ref; 125}; 126 127struct ctl_be_block_filedata { 128 struct ucred *cred; 129}; 130 131union ctl_be_block_bedata { 132 struct ctl_be_block_devdata dev; 133 struct ctl_be_block_filedata file; 134}; 135 136struct ctl_be_block_io; 137struct ctl_be_block_lun; 138 139typedef void (*cbb_dispatch_t)(struct ctl_be_block_lun *be_lun, 140 struct ctl_be_block_io *beio); 141 142/* 143 * Backend LUN structure. There is a 1:1 mapping between a block device 144 * and a backend block LUN, and between a backend block LUN and a CTL LUN. 145 */ 146struct ctl_be_block_lun { 147 struct ctl_block_disk *disk; 148 char lunname[32]; 149 char *dev_path; 150 ctl_be_block_type dev_type; 151 struct vnode *vn; 152 union ctl_be_block_bedata backend; 153 cbb_dispatch_t dispatch; 154 cbb_dispatch_t lun_flush; 155 struct mtx lock; 156 uma_zone_t lun_zone; 157 uint64_t size_blocks; 158 uint64_t size_bytes; 159 uint32_t blocksize; 160 int blocksize_shift; 161 struct ctl_be_block_softc *softc; 162 struct devstat *disk_stats; 163 ctl_be_block_lun_flags flags; 164 STAILQ_ENTRY(ctl_be_block_lun) links; 165 struct ctl_be_lun ctl_be_lun; 166 struct taskqueue *io_taskqueue; 167 struct task io_task; 168 int num_threads; 169 STAILQ_HEAD(, ctl_io_hdr) input_queue; 170 STAILQ_HEAD(, ctl_io_hdr) config_write_queue; 171 STAILQ_HEAD(, ctl_io_hdr) datamove_queue; 172}; 173 174/* 175 * Overall softc structure for the block backend module. 176 */ 177struct ctl_be_block_softc { 178 STAILQ_HEAD(, ctl_be_block_io) beio_free_queue; 179 struct mtx lock; 180 int prealloc_beio; 181 int num_disks; 182 STAILQ_HEAD(, ctl_block_disk) disk_list; 183 int num_luns; 184 STAILQ_HEAD(, ctl_be_block_lun) lun_list; 185}; 186 187static struct ctl_be_block_softc backend_block_softc; 188 189/* 190 * Per-I/O information. 191 */ 192struct ctl_be_block_io { 193 union ctl_io *io; 194 struct ctl_sg_entry sg_segs[CTLBLK_MAX_SEGS]; 195 struct iovec xiovecs[CTLBLK_MAX_SEGS]; 196 int bio_cmd; 197 int bio_flags; 198 int num_segs; 199 int num_bios_sent; 200 int num_bios_done; 201 int send_complete; 202 int num_errors; 203 struct bintime ds_t0; 204 devstat_tag_type ds_tag_type; 205 devstat_trans_flags ds_trans_type; 206 uint64_t io_len; 207 uint64_t io_offset; 208 struct ctl_be_block_softc *softc; 209 struct ctl_be_block_lun *lun; 210 STAILQ_ENTRY(ctl_be_block_io) links; 211}; 212 213static int cbb_num_threads = 14; 214TUNABLE_INT("kern.cam.ctl.block.num_threads", &cbb_num_threads); 215SYSCTL_NODE(_kern_cam_ctl, OID_AUTO, block, CTLFLAG_RD, 0, 216 "CAM Target Layer Block Backend"); 217SYSCTL_INT(_kern_cam_ctl_block, OID_AUTO, num_threads, CTLFLAG_RW, 218 &cbb_num_threads, 0, "Number of threads per backing file"); 219 220static struct ctl_be_block_io *ctl_alloc_beio(struct ctl_be_block_softc *softc); 221static void ctl_free_beio(struct ctl_be_block_io *beio); 222static int ctl_grow_beio(struct ctl_be_block_softc *softc, int count); 223#if 0 224static void ctl_shrink_beio(struct ctl_be_block_softc *softc); 225#endif 226static void ctl_complete_beio(struct ctl_be_block_io *beio); 227static int ctl_be_block_move_done(union ctl_io *io); 228static void ctl_be_block_biodone(struct bio *bio); 229static void ctl_be_block_flush_file(struct ctl_be_block_lun *be_lun, 230 struct ctl_be_block_io *beio); 231static void ctl_be_block_dispatch_file(struct ctl_be_block_lun *be_lun, 232 struct ctl_be_block_io *beio); 233static void ctl_be_block_flush_dev(struct ctl_be_block_lun *be_lun, 234 struct ctl_be_block_io *beio); 235static void ctl_be_block_dispatch_dev(struct ctl_be_block_lun *be_lun, 236 struct ctl_be_block_io *beio); 237static void ctl_be_block_cw_dispatch(struct ctl_be_block_lun *be_lun, 238 union ctl_io *io); 239static void ctl_be_block_dispatch(struct ctl_be_block_lun *be_lun, 240 union ctl_io *io); 241static void ctl_be_block_worker(void *context, int pending); 242static int ctl_be_block_submit(union ctl_io *io); 243static int ctl_be_block_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, 244 int flag, struct thread *td); 245static int ctl_be_block_open_file(struct ctl_be_block_lun *be_lun, 246 struct ctl_lun_req *req); 247static int ctl_be_block_open_dev(struct ctl_be_block_lun *be_lun, 248 struct ctl_lun_req *req); 249static int ctl_be_block_close(struct ctl_be_block_lun *be_lun); 250static int ctl_be_block_open(struct ctl_be_block_softc *softc, 251 struct ctl_be_block_lun *be_lun, 252 struct ctl_lun_req *req); 253static int ctl_be_block_create(struct ctl_be_block_softc *softc, 254 struct ctl_lun_req *req); 255static int ctl_be_block_rm(struct ctl_be_block_softc *softc, 256 struct ctl_lun_req *req); 257static int ctl_be_block_modify_file(struct ctl_be_block_lun *be_lun, 258 struct ctl_lun_req *req); 259static int ctl_be_block_modify_dev(struct ctl_be_block_lun *be_lun, 260 struct ctl_lun_req *req); 261static int ctl_be_block_modify(struct ctl_be_block_softc *softc, 262 struct ctl_lun_req *req); 263static void ctl_be_block_lun_shutdown(void *be_lun); 264static void ctl_be_block_lun_config_status(void *be_lun, 265 ctl_lun_config_status status); 266static int ctl_be_block_config_write(union ctl_io *io); 267static int ctl_be_block_config_read(union ctl_io *io); 268static int ctl_be_block_lun_info(void *be_lun, struct sbuf *sb); 269int ctl_be_block_init(void); 270 271static struct ctl_backend_driver ctl_be_block_driver = 272{ 273 .name = "block", 274 .flags = CTL_BE_FLAG_HAS_CONFIG, 275 .init = ctl_be_block_init, 276 .data_submit = ctl_be_block_submit, 277 .data_move_done = ctl_be_block_move_done, 278 .config_read = ctl_be_block_config_read, 279 .config_write = ctl_be_block_config_write, 280 .ioctl = ctl_be_block_ioctl, 281 .lun_info = ctl_be_block_lun_info 282}; 283 284MALLOC_DEFINE(M_CTLBLK, "ctlblk", "Memory used for CTL block backend"); 285CTL_BACKEND_DECLARE(cbb, ctl_be_block_driver); 286 287static struct ctl_be_block_io * 288ctl_alloc_beio(struct ctl_be_block_softc *softc) 289{ 290 struct ctl_be_block_io *beio; 291 int count; 292 293 mtx_lock(&softc->lock); 294 295 beio = STAILQ_FIRST(&softc->beio_free_queue); 296 if (beio != NULL) { 297 STAILQ_REMOVE(&softc->beio_free_queue, beio, 298 ctl_be_block_io, links); 299 } 300 mtx_unlock(&softc->lock); 301 302 if (beio != NULL) { 303 bzero(beio, sizeof(*beio)); 304 beio->softc = softc; 305 return (beio); 306 } 307 308 for (;;) { 309 310 count = ctl_grow_beio(softc, /*count*/ 10); 311 312 /* 313 * This shouldn't be possible, since ctl_grow_beio() uses a 314 * blocking malloc. 315 */ 316 if (count == 0) 317 return (NULL); 318 319 /* 320 * Since we have to drop the lock when we're allocating beio 321 * structures, it's possible someone else can come along and 322 * allocate the beio's we've just allocated. 323 */ 324 mtx_lock(&softc->lock); 325 beio = STAILQ_FIRST(&softc->beio_free_queue); 326 if (beio != NULL) { 327 STAILQ_REMOVE(&softc->beio_free_queue, beio, 328 ctl_be_block_io, links); 329 } 330 mtx_unlock(&softc->lock); 331 332 if (beio != NULL) { 333 bzero(beio, sizeof(*beio)); 334 beio->softc = softc; 335 break; 336 } 337 } 338 return (beio); 339} 340 341static void 342ctl_free_beio(struct ctl_be_block_io *beio) 343{ 344 struct ctl_be_block_softc *softc; 345 int duplicate_free; 346 int i; 347 348 softc = beio->softc; 349 duplicate_free = 0; 350 351 for (i = 0; i < beio->num_segs; i++) { 352 if (beio->sg_segs[i].addr == NULL) 353 duplicate_free++; 354 355 uma_zfree(beio->lun->lun_zone, beio->sg_segs[i].addr); 356 beio->sg_segs[i].addr = NULL; 357 } 358 359 if (duplicate_free > 0) { 360 printf("%s: %d duplicate frees out of %d segments\n", __func__, 361 duplicate_free, beio->num_segs); 362 } 363 mtx_lock(&softc->lock); 364 STAILQ_INSERT_TAIL(&softc->beio_free_queue, beio, links); 365 mtx_unlock(&softc->lock); 366} 367 368static int 369ctl_grow_beio(struct ctl_be_block_softc *softc, int count) 370{ 371 int i; 372 373 for (i = 0; i < count; i++) { 374 struct ctl_be_block_io *beio; 375 376 beio = (struct ctl_be_block_io *)malloc(sizeof(*beio), 377 M_CTLBLK, 378 M_WAITOK | M_ZERO); 379 beio->softc = softc; 380 mtx_lock(&softc->lock); 381 STAILQ_INSERT_TAIL(&softc->beio_free_queue, beio, links); 382 mtx_unlock(&softc->lock); 383 } 384 385 return (i); 386} 387 388#if 0 389static void 390ctl_shrink_beio(struct ctl_be_block_softc *softc) 391{ 392 struct ctl_be_block_io *beio, *beio_tmp; 393 394 mtx_lock(&softc->lock); 395 STAILQ_FOREACH_SAFE(beio, &softc->beio_free_queue, links, beio_tmp) { 396 STAILQ_REMOVE(&softc->beio_free_queue, beio, 397 ctl_be_block_io, links); 398 free(beio, M_CTLBLK); 399 } 400 mtx_unlock(&softc->lock); 401} 402#endif 403 404static void 405ctl_complete_beio(struct ctl_be_block_io *beio) 406{ 407 union ctl_io *io; 408 int io_len; 409 410 io = beio->io; 411 412 if ((io->io_hdr.status & CTL_STATUS_MASK) == CTL_SUCCESS) 413 io_len = beio->io_len; 414 else 415 io_len = 0; 416 417 devstat_end_transaction(beio->lun->disk_stats, 418 /*bytes*/ io_len, 419 beio->ds_tag_type, 420 beio->ds_trans_type, 421 /*now*/ NULL, 422 /*then*/&beio->ds_t0); 423 424 ctl_free_beio(beio); 425 ctl_done(io); 426} 427 428static int 429ctl_be_block_move_done(union ctl_io *io) 430{ 431 struct ctl_be_block_io *beio; 432 struct ctl_be_block_lun *be_lun; 433#ifdef CTL_TIME_IO 434 struct bintime cur_bt; 435#endif 436 437 beio = (struct ctl_be_block_io *) 438 io->io_hdr.ctl_private[CTL_PRIV_BACKEND].ptr; 439 440 be_lun = beio->lun; 441 442 DPRINTF("entered\n"); 443 444#ifdef CTL_TIME_IO 445 getbintime(&cur_bt); 446 bintime_sub(&cur_bt, &io->io_hdr.dma_start_bt); 447 bintime_add(&io->io_hdr.dma_bt, &cur_bt); 448 io->io_hdr.num_dmas++; 449#endif 450 451 /* 452 * We set status at this point for read commands, and write 453 * commands with errors. 454 */ 455 if ((beio->bio_cmd == BIO_READ) 456 && (io->io_hdr.port_status == 0) 457 && ((io->io_hdr.flags & CTL_FLAG_ABORT) == 0) 458 && ((io->io_hdr.status & CTL_STATUS_MASK) == CTL_STATUS_NONE)) 459 ctl_set_success(&io->scsiio); 460 else if ((io->io_hdr.port_status != 0) 461 && ((io->io_hdr.flags & CTL_FLAG_ABORT) == 0) 462 && ((io->io_hdr.status & CTL_STATUS_MASK) == CTL_STATUS_NONE)) { 463 /* 464 * For hardware error sense keys, the sense key 465 * specific value is defined to be a retry count, 466 * but we use it to pass back an internal FETD 467 * error code. XXX KDM Hopefully the FETD is only 468 * using 16 bits for an error code, since that's 469 * all the space we have in the sks field. 470 */ 471 ctl_set_internal_failure(&io->scsiio, 472 /*sks_valid*/ 1, 473 /*retry_count*/ 474 io->io_hdr.port_status); 475 } 476 477 /* 478 * If this is a read, or a write with errors, it is done. 479 */ 480 if ((beio->bio_cmd == BIO_READ) 481 || ((io->io_hdr.flags & CTL_FLAG_ABORT) != 0) 482 || ((io->io_hdr.status & CTL_STATUS_MASK) != CTL_STATUS_NONE)) { 483 ctl_complete_beio(beio); 484 return (0); 485 } 486 487 /* 488 * At this point, we have a write and the DMA completed 489 * successfully. We now have to queue it to the task queue to 490 * execute the backend I/O. That is because we do blocking 491 * memory allocations, and in the file backing case, blocking I/O. 492 * This move done routine is generally called in the SIM's 493 * interrupt context, and therefore we cannot block. 494 */ 495 mtx_lock(&be_lun->lock); 496 /* 497 * XXX KDM make sure that links is okay to use at this point. 498 * Otherwise, we either need to add another field to ctl_io_hdr, 499 * or deal with resource allocation here. 500 */ 501 STAILQ_INSERT_TAIL(&be_lun->datamove_queue, &io->io_hdr, links); 502 mtx_unlock(&be_lun->lock); 503 504 taskqueue_enqueue(be_lun->io_taskqueue, &be_lun->io_task); 505 506 return (0); 507} 508 509static void 510ctl_be_block_biodone(struct bio *bio) 511{ 512 struct ctl_be_block_io *beio; 513 struct ctl_be_block_lun *be_lun; 514 union ctl_io *io; 515 516 beio = bio->bio_caller1; 517 be_lun = beio->lun; 518 io = beio->io; 519 520 DPRINTF("entered\n"); 521 522 mtx_lock(&be_lun->lock); 523 if (bio->bio_error != 0) 524 beio->num_errors++; 525 526 beio->num_bios_done++; 527 528 /* 529 * XXX KDM will this cause WITNESS to complain? Holding a lock 530 * during the free might cause it to complain. 531 */ 532 g_destroy_bio(bio); 533 534 /* 535 * If the send complete bit isn't set, or we aren't the last I/O to 536 * complete, then we're done. 537 */ 538 if ((beio->send_complete == 0) 539 || (beio->num_bios_done < beio->num_bios_sent)) { 540 mtx_unlock(&be_lun->lock); 541 return; 542 } 543 544 /* 545 * At this point, we've verified that we are the last I/O to 546 * complete, so it's safe to drop the lock. 547 */ 548 mtx_unlock(&be_lun->lock); 549 550 /* 551 * If there are any errors from the backing device, we fail the 552 * entire I/O with a medium error. 553 */ 554 if (beio->num_errors > 0) { 555 if (beio->bio_cmd == BIO_FLUSH) { 556 /* XXX KDM is there is a better error here? */ 557 ctl_set_internal_failure(&io->scsiio, 558 /*sks_valid*/ 1, 559 /*retry_count*/ 0xbad2); 560 } else 561 ctl_set_medium_error(&io->scsiio); 562 ctl_complete_beio(beio); 563 return; 564 } 565 566 /* 567 * If this is a write or a flush, we're all done. 568 * If this is a read, we can now send the data to the user. 569 */ 570 if ((beio->bio_cmd == BIO_WRITE) 571 || (beio->bio_cmd == BIO_FLUSH)) { 572 ctl_set_success(&io->scsiio); 573 ctl_complete_beio(beio); 574 } else { 575 io->scsiio.be_move_done = ctl_be_block_move_done; 576 io->scsiio.kern_data_ptr = (uint8_t *)beio->sg_segs; 577 io->scsiio.kern_data_len = beio->io_len; 578 io->scsiio.kern_total_len = beio->io_len; 579 io->scsiio.kern_rel_offset = 0; 580 io->scsiio.kern_data_resid = 0; 581 io->scsiio.kern_sg_entries = beio->num_segs; 582 io->io_hdr.flags |= CTL_FLAG_ALLOCATED | CTL_FLAG_KDPTR_SGLIST; 583#ifdef CTL_TIME_IO 584 getbintime(&io->io_hdr.dma_start_bt); 585#endif 586 ctl_datamove(io); 587 } 588} 589 590static void 591ctl_be_block_flush_file(struct ctl_be_block_lun *be_lun, 592 struct ctl_be_block_io *beio) 593{ 594 union ctl_io *io; 595 struct mount *mountpoint; 596 int error, lock_flags; 597 598 DPRINTF("entered\n"); 599 600 io = beio->io; 601 602 (void) vn_start_write(be_lun->vn, &mountpoint, V_WAIT); 603 604 if (MNT_SHARED_WRITES(mountpoint) 605 || ((mountpoint == NULL) 606 && MNT_SHARED_WRITES(be_lun->vn->v_mount))) 607 lock_flags = LK_SHARED; 608 else 609 lock_flags = LK_EXCLUSIVE; 610 611 vn_lock(be_lun->vn, lock_flags | LK_RETRY); 612 613 binuptime(&beio->ds_t0); 614 devstat_start_transaction(beio->lun->disk_stats, &beio->ds_t0); 615 616 error = VOP_FSYNC(be_lun->vn, MNT_WAIT, curthread); 617 VOP_UNLOCK(be_lun->vn, 0); 618 619 vn_finished_write(mountpoint); 620 621 if (error == 0) 622 ctl_set_success(&io->scsiio); 623 else { 624 /* XXX KDM is there is a better error here? */ 625 ctl_set_internal_failure(&io->scsiio, 626 /*sks_valid*/ 1, 627 /*retry_count*/ 0xbad1); 628 } 629 630 ctl_complete_beio(beio); 631} 632 633SDT_PROBE_DEFINE1(cbb, kernel, read, file_start, file_start, "uint64_t"); 634SDT_PROBE_DEFINE1(cbb, kernel, write, file_start, file_start, "uint64_t"); 635SDT_PROBE_DEFINE1(cbb, kernel, read, file_done, file_done,"uint64_t"); 636SDT_PROBE_DEFINE1(cbb, kernel, write, file_done, file_done, "uint64_t"); 637 638static void 639ctl_be_block_dispatch_file(struct ctl_be_block_lun *be_lun, 640 struct ctl_be_block_io *beio) 641{ 642 struct ctl_be_block_filedata *file_data; 643 union ctl_io *io; 644 struct uio xuio; 645 struct iovec *xiovec; 646 int flags; 647 int error, i; 648 649 DPRINTF("entered\n"); 650 651 file_data = &be_lun->backend.file; 652 io = beio->io; 653 flags = beio->bio_flags; 654 655 if (beio->bio_cmd == BIO_READ) { 656 SDT_PROBE(cbb, kernel, read, file_start, 0, 0, 0, 0, 0); 657 } else { 658 SDT_PROBE(cbb, kernel, write, file_start, 0, 0, 0, 0, 0); 659 } 660 661 bzero(&xuio, sizeof(xuio)); 662 if (beio->bio_cmd == BIO_READ) 663 xuio.uio_rw = UIO_READ; 664 else 665 xuio.uio_rw = UIO_WRITE; 666 667 xuio.uio_offset = beio->io_offset; 668 xuio.uio_resid = beio->io_len; 669 xuio.uio_segflg = UIO_SYSSPACE; 670 xuio.uio_iov = beio->xiovecs; 671 xuio.uio_iovcnt = beio->num_segs; 672 xuio.uio_td = curthread; 673 674 for (i = 0, xiovec = xuio.uio_iov; i < xuio.uio_iovcnt; i++, xiovec++) { 675 xiovec->iov_base = beio->sg_segs[i].addr; 676 xiovec->iov_len = beio->sg_segs[i].len; 677 } 678 679 if (beio->bio_cmd == BIO_READ) { 680 vn_lock(be_lun->vn, LK_SHARED | LK_RETRY); 681 682 binuptime(&beio->ds_t0); 683 devstat_start_transaction(beio->lun->disk_stats, &beio->ds_t0); 684 685 /* 686 * UFS pays attention to IO_DIRECT for reads. If the 687 * DIRECTIO option is configured into the kernel, it calls 688 * ffs_rawread(). But that only works for single-segment 689 * uios with user space addresses. In our case, with a 690 * kernel uio, it still reads into the buffer cache, but it 691 * will just try to release the buffer from the cache later 692 * on in ffs_read(). 693 * 694 * ZFS does not pay attention to IO_DIRECT for reads. 695 * 696 * UFS does not pay attention to IO_SYNC for reads. 697 * 698 * ZFS pays attention to IO_SYNC (which translates into the 699 * Solaris define FRSYNC for zfs_read()) for reads. It 700 * attempts to sync the file before reading. 701 * 702 * So, to attempt to provide some barrier semantics in the 703 * BIO_ORDERED case, set both IO_DIRECT and IO_SYNC. 704 */ 705 error = VOP_READ(be_lun->vn, &xuio, (flags & BIO_ORDERED) ? 706 (IO_DIRECT|IO_SYNC) : 0, file_data->cred); 707 708 VOP_UNLOCK(be_lun->vn, 0); 709 } else { 710 struct mount *mountpoint; 711 int lock_flags; 712 713 (void)vn_start_write(be_lun->vn, &mountpoint, V_WAIT); 714 715 if (MNT_SHARED_WRITES(mountpoint) 716 || ((mountpoint == NULL) 717 && MNT_SHARED_WRITES(be_lun->vn->v_mount))) 718 lock_flags = LK_SHARED; 719 else 720 lock_flags = LK_EXCLUSIVE; 721 722 vn_lock(be_lun->vn, lock_flags | LK_RETRY); 723 724 binuptime(&beio->ds_t0); 725 devstat_start_transaction(beio->lun->disk_stats, &beio->ds_t0); 726 727 /* 728 * UFS pays attention to IO_DIRECT for writes. The write 729 * is done asynchronously. (Normally the write would just 730 * get put into cache. 731 * 732 * UFS pays attention to IO_SYNC for writes. It will 733 * attempt to write the buffer out synchronously if that 734 * flag is set. 735 * 736 * ZFS does not pay attention to IO_DIRECT for writes. 737 * 738 * ZFS pays attention to IO_SYNC (a.k.a. FSYNC or FRSYNC) 739 * for writes. It will flush the transaction from the 740 * cache before returning. 741 * 742 * So if we've got the BIO_ORDERED flag set, we want 743 * IO_SYNC in either the UFS or ZFS case. 744 */ 745 error = VOP_WRITE(be_lun->vn, &xuio, (flags & BIO_ORDERED) ? 746 IO_SYNC : 0, file_data->cred); 747 VOP_UNLOCK(be_lun->vn, 0); 748 749 vn_finished_write(mountpoint); 750 } 751 752 /* 753 * If we got an error, set the sense data to "MEDIUM ERROR" and 754 * return the I/O to the user. 755 */ 756 if (error != 0) { 757 char path_str[32]; 758 759 ctl_scsi_path_string(io, path_str, sizeof(path_str)); 760 /* 761 * XXX KDM ZFS returns ENOSPC when the underlying 762 * filesystem fills up. What kind of SCSI error should we 763 * return for that? 764 */ 765 printf("%s%s command returned errno %d\n", path_str, 766 (beio->bio_cmd == BIO_READ) ? "READ" : "WRITE", error); 767 ctl_set_medium_error(&io->scsiio); 768 ctl_complete_beio(beio); 769 return; 770 } 771 772 /* 773 * If this is a write, we're all done. 774 * If this is a read, we can now send the data to the user. 775 */ 776 if (beio->bio_cmd == BIO_WRITE) { 777 ctl_set_success(&io->scsiio); 778 SDT_PROBE(cbb, kernel, write, file_done, 0, 0, 0, 0, 0); 779 ctl_complete_beio(beio); 780 } else { 781 SDT_PROBE(cbb, kernel, read, file_done, 0, 0, 0, 0, 0); 782 io->scsiio.be_move_done = ctl_be_block_move_done; 783 io->scsiio.kern_data_ptr = (uint8_t *)beio->sg_segs; 784 io->scsiio.kern_data_len = beio->io_len; 785 io->scsiio.kern_total_len = beio->io_len; 786 io->scsiio.kern_rel_offset = 0; 787 io->scsiio.kern_data_resid = 0; 788 io->scsiio.kern_sg_entries = beio->num_segs; 789 io->io_hdr.flags |= CTL_FLAG_ALLOCATED | CTL_FLAG_KDPTR_SGLIST; 790#ifdef CTL_TIME_IO 791 getbintime(&io->io_hdr.dma_start_bt); 792#endif 793 ctl_datamove(io); 794 } 795} 796 797static void 798ctl_be_block_flush_dev(struct ctl_be_block_lun *be_lun, 799 struct ctl_be_block_io *beio) 800{ 801 struct bio *bio; 802 union ctl_io *io; 803 struct ctl_be_block_devdata *dev_data; 804 805 dev_data = &be_lun->backend.dev; 806 io = beio->io; 807 808 DPRINTF("entered\n"); 809 810 /* This can't fail, it's a blocking allocation. */ 811 bio = g_alloc_bio(); 812 813 bio->bio_cmd = BIO_FLUSH; 814 bio->bio_flags |= BIO_ORDERED; 815 bio->bio_dev = dev_data->cdev; 816 bio->bio_offset = 0; 817 bio->bio_data = 0; 818 bio->bio_done = ctl_be_block_biodone; 819 bio->bio_caller1 = beio; 820 bio->bio_pblkno = 0; 821 822 /* 823 * We don't need to acquire the LUN lock here, because we are only 824 * sending one bio, and so there is no other context to synchronize 825 * with. 826 */ 827 beio->num_bios_sent = 1; 828 beio->send_complete = 1; 829 830 binuptime(&beio->ds_t0); 831 devstat_start_transaction(be_lun->disk_stats, &beio->ds_t0); 832 833 (*dev_data->csw->d_strategy)(bio); 834} 835 836static void 837ctl_be_block_dispatch_dev(struct ctl_be_block_lun *be_lun, 838 struct ctl_be_block_io *beio) 839{ 840 int i; 841 struct bio *bio; 842 struct ctl_be_block_devdata *dev_data; 843 off_t cur_offset; 844 int max_iosize; 845 846 DPRINTF("entered\n"); 847 848 dev_data = &be_lun->backend.dev; 849 850 /* 851 * We have to limit our I/O size to the maximum supported by the 852 * backend device. Hopefully it is MAXPHYS. If the driver doesn't 853 * set it properly, use DFLTPHYS. 854 */ 855 max_iosize = dev_data->cdev->si_iosize_max; 856 if (max_iosize < PAGE_SIZE) 857 max_iosize = DFLTPHYS; 858 859 cur_offset = beio->io_offset; 860 861 /* 862 * XXX KDM need to accurately reflect the number of I/Os outstanding 863 * to a device. 864 */ 865 binuptime(&beio->ds_t0); 866 devstat_start_transaction(be_lun->disk_stats, &beio->ds_t0); 867 868 for (i = 0; i < beio->num_segs; i++) { 869 size_t cur_size; 870 uint8_t *cur_ptr; 871 872 cur_size = beio->sg_segs[i].len; 873 cur_ptr = beio->sg_segs[i].addr; 874 875 while (cur_size > 0) { 876 /* This can't fail, it's a blocking allocation. */ 877 bio = g_alloc_bio(); 878 879 KASSERT(bio != NULL, ("g_alloc_bio() failed!\n")); 880 881 bio->bio_cmd = beio->bio_cmd; 882 bio->bio_flags |= beio->bio_flags; 883 bio->bio_dev = dev_data->cdev; 884 bio->bio_caller1 = beio; 885 bio->bio_length = min(cur_size, max_iosize); 886 bio->bio_offset = cur_offset; 887 bio->bio_data = cur_ptr; 888 bio->bio_done = ctl_be_block_biodone; 889 bio->bio_pblkno = cur_offset / be_lun->blocksize; 890 891 cur_offset += bio->bio_length; 892 cur_ptr += bio->bio_length; 893 cur_size -= bio->bio_length; 894 895 /* 896 * Make sure we set the complete bit just before we 897 * issue the last bio so we don't wind up with a 898 * race. 899 * 900 * Use the LUN mutex here instead of a combination 901 * of atomic variables for simplicity. 902 * 903 * XXX KDM we could have a per-IO lock, but that 904 * would cause additional per-IO setup and teardown 905 * overhead. Hopefully there won't be too much 906 * contention on the LUN lock. 907 */ 908 mtx_lock(&be_lun->lock); 909 910 beio->num_bios_sent++; 911 912 if ((i == beio->num_segs - 1) 913 && (cur_size == 0)) 914 beio->send_complete = 1; 915 916 mtx_unlock(&be_lun->lock); 917 918 (*dev_data->csw->d_strategy)(bio); 919 } 920 } 921} 922 923static void 924ctl_be_block_cw_dispatch(struct ctl_be_block_lun *be_lun, 925 union ctl_io *io) 926{ 927 struct ctl_be_block_io *beio; 928 struct ctl_be_block_softc *softc; 929 930 DPRINTF("entered\n"); 931 932 softc = be_lun->softc; 933 beio = ctl_alloc_beio(softc); 934 if (beio == NULL) { 935 /* 936 * This should not happen. ctl_alloc_beio() will call 937 * ctl_grow_beio() with a blocking malloc as needed. 938 * A malloc with M_WAITOK should not fail. 939 */ 940 ctl_set_busy(&io->scsiio); 941 ctl_done(io); 942 return; 943 } 944 945 beio->io = io; 946 beio->softc = softc; 947 beio->lun = be_lun; 948 io->io_hdr.ctl_private[CTL_PRIV_BACKEND].ptr = beio; 949 950 switch (io->scsiio.cdb[0]) { 951 case SYNCHRONIZE_CACHE: 952 case SYNCHRONIZE_CACHE_16: 953 beio->bio_cmd = BIO_FLUSH; 954 beio->ds_trans_type = DEVSTAT_NO_DATA; 955 beio->ds_tag_type = DEVSTAT_TAG_ORDERED; 956 beio->io_len = 0; 957 be_lun->lun_flush(be_lun, beio); 958 break; 959 default: 960 panic("Unhandled CDB type %#x", io->scsiio.cdb[0]); 961 break; 962 } 963} 964 965SDT_PROBE_DEFINE1(cbb, kernel, read, start, start, "uint64_t"); 966SDT_PROBE_DEFINE1(cbb, kernel, write, start, start, "uint64_t"); 967SDT_PROBE_DEFINE1(cbb, kernel, read, alloc_done, alloc_done, "uint64_t"); 968SDT_PROBE_DEFINE1(cbb, kernel, write, alloc_done, alloc_done, "uint64_t"); 969 970static void 971ctl_be_block_dispatch(struct ctl_be_block_lun *be_lun, 972 union ctl_io *io) 973{ 974 struct ctl_be_block_io *beio; 975 struct ctl_be_block_softc *softc; 976 struct ctl_lba_len lbalen; 977 uint64_t len_left, io_size_bytes; 978 int i; 979 980 softc = be_lun->softc; 981 982 DPRINTF("entered\n"); 983 984 if ((io->io_hdr.flags & CTL_FLAG_DATA_MASK) == CTL_FLAG_DATA_IN) { 985 SDT_PROBE(cbb, kernel, read, start, 0, 0, 0, 0, 0); 986 } else { 987 SDT_PROBE(cbb, kernel, write, start, 0, 0, 0, 0, 0); 988 } 989 990 memcpy(&lbalen, io->io_hdr.ctl_private[CTL_PRIV_LBA_LEN].bytes, 991 sizeof(lbalen)); 992 993 io_size_bytes = lbalen.len * be_lun->blocksize; 994 995 /* 996 * XXX KDM this is temporary, until we implement chaining of beio 997 * structures and multiple datamove calls to move all the data in 998 * or out. 999 */ 1000 if (io_size_bytes > CTLBLK_MAX_IO_SIZE) { 1001 printf("%s: IO length %ju > max io size %u\n", __func__, 1002 io_size_bytes, CTLBLK_MAX_IO_SIZE); 1003 ctl_set_invalid_field(&io->scsiio, 1004 /*sks_valid*/ 0, 1005 /*command*/ 1, 1006 /*field*/ 0, 1007 /*bit_valid*/ 0, 1008 /*bit*/ 0); 1009 ctl_done(io); 1010 return; 1011 } 1012 1013 beio = ctl_alloc_beio(softc); 1014 if (beio == NULL) { 1015 /* 1016 * This should not happen. ctl_alloc_beio() will call 1017 * ctl_grow_beio() with a blocking malloc as needed. 1018 * A malloc with M_WAITOK should not fail. 1019 */ 1020 ctl_set_busy(&io->scsiio); 1021 ctl_done(io); 1022 return; 1023 } 1024 1025 beio->io = io; 1026 beio->softc = softc; 1027 beio->lun = be_lun; 1028 io->io_hdr.ctl_private[CTL_PRIV_BACKEND].ptr = beio; 1029 1030 /* 1031 * If the I/O came down with an ordered or head of queue tag, set 1032 * the BIO_ORDERED attribute. For head of queue tags, that's 1033 * pretty much the best we can do. 1034 * 1035 * XXX KDM we don't have a great way to easily know about the FUA 1036 * bit right now (it is decoded in ctl_read_write(), but we don't 1037 * pass that knowledge to the backend), and in any case we would 1038 * need to determine how to handle it. 1039 */ 1040 if ((io->scsiio.tag_type == CTL_TAG_ORDERED) 1041 || (io->scsiio.tag_type == CTL_TAG_HEAD_OF_QUEUE)) 1042 beio->bio_flags = BIO_ORDERED; 1043 1044 switch (io->scsiio.tag_type) { 1045 case CTL_TAG_ORDERED: 1046 beio->ds_tag_type = DEVSTAT_TAG_ORDERED; 1047 break; 1048 case CTL_TAG_HEAD_OF_QUEUE: 1049 beio->ds_tag_type = DEVSTAT_TAG_HEAD; 1050 break; 1051 case CTL_TAG_UNTAGGED: 1052 case CTL_TAG_SIMPLE: 1053 case CTL_TAG_ACA: 1054 default: 1055 beio->ds_tag_type = DEVSTAT_TAG_SIMPLE; 1056 break; 1057 } 1058 1059 /* 1060 * This path handles read and write only. The config write path 1061 * handles flush operations. 1062 */ 1063 if ((io->io_hdr.flags & CTL_FLAG_DATA_MASK) == CTL_FLAG_DATA_IN) { 1064 beio->bio_cmd = BIO_READ; 1065 beio->ds_trans_type = DEVSTAT_READ; 1066 } else { 1067 beio->bio_cmd = BIO_WRITE; 1068 beio->ds_trans_type = DEVSTAT_WRITE; 1069 } 1070 1071 beio->io_len = lbalen.len * be_lun->blocksize; 1072 beio->io_offset = lbalen.lba * be_lun->blocksize; 1073 1074 DPRINTF("%s at LBA %jx len %u\n", 1075 (beio->bio_cmd == BIO_READ) ? "READ" : "WRITE", 1076 (uintmax_t)lbalen.lba, lbalen.len); 1077 1078 for (i = 0, len_left = io_size_bytes; i < CTLBLK_MAX_SEGS && 1079 len_left > 0; i++) { 1080 1081 /* 1082 * Setup the S/G entry for this chunk. 1083 */ 1084 beio->sg_segs[i].len = min(MAXPHYS, len_left); 1085 beio->sg_segs[i].addr = uma_zalloc(be_lun->lun_zone, M_WAITOK); 1086 1087 DPRINTF("segment %d addr %p len %zd\n", i, 1088 beio->sg_segs[i].addr, beio->sg_segs[i].len); 1089 1090 beio->num_segs++; 1091 len_left -= beio->sg_segs[i].len; 1092 } 1093 1094 /* 1095 * For the read case, we need to read the data into our buffers and 1096 * then we can send it back to the user. For the write case, we 1097 * need to get the data from the user first. 1098 */ 1099 if (beio->bio_cmd == BIO_READ) { 1100 SDT_PROBE(cbb, kernel, read, alloc_done, 0, 0, 0, 0, 0); 1101 be_lun->dispatch(be_lun, beio); 1102 } else { 1103 SDT_PROBE(cbb, kernel, write, alloc_done, 0, 0, 0, 0, 0); 1104 io->scsiio.be_move_done = ctl_be_block_move_done; 1105 io->scsiio.kern_data_ptr = (uint8_t *)beio->sg_segs; 1106 io->scsiio.kern_data_len = beio->io_len; 1107 io->scsiio.kern_total_len = beio->io_len; 1108 io->scsiio.kern_rel_offset = 0; 1109 io->scsiio.kern_data_resid = 0; 1110 io->scsiio.kern_sg_entries = beio->num_segs; 1111 io->io_hdr.flags |= CTL_FLAG_ALLOCATED | CTL_FLAG_KDPTR_SGLIST; 1112#ifdef CTL_TIME_IO 1113 getbintime(&io->io_hdr.dma_start_bt); 1114#endif 1115 ctl_datamove(io); 1116 } 1117} 1118 1119static void 1120ctl_be_block_worker(void *context, int pending) 1121{ 1122 struct ctl_be_block_lun *be_lun; 1123 struct ctl_be_block_softc *softc; 1124 union ctl_io *io; 1125 1126 be_lun = (struct ctl_be_block_lun *)context; 1127 softc = be_lun->softc; 1128 1129 DPRINTF("entered\n"); 1130 1131 mtx_lock(&be_lun->lock); 1132 for (;;) { 1133 io = (union ctl_io *)STAILQ_FIRST(&be_lun->datamove_queue); 1134 if (io != NULL) { 1135 struct ctl_be_block_io *beio; 1136 1137 DPRINTF("datamove queue\n"); 1138 1139 STAILQ_REMOVE(&be_lun->datamove_queue, &io->io_hdr, 1140 ctl_io_hdr, links); 1141 1142 mtx_unlock(&be_lun->lock); 1143 1144 beio = (struct ctl_be_block_io *) 1145 io->io_hdr.ctl_private[CTL_PRIV_BACKEND].ptr; 1146 1147 be_lun->dispatch(be_lun, beio); 1148 1149 mtx_lock(&be_lun->lock); 1150 continue; 1151 } 1152 io = (union ctl_io *)STAILQ_FIRST(&be_lun->config_write_queue); 1153 if (io != NULL) { 1154 1155 DPRINTF("config write queue\n"); 1156 1157 STAILQ_REMOVE(&be_lun->config_write_queue, &io->io_hdr, 1158 ctl_io_hdr, links); 1159 1160 mtx_unlock(&be_lun->lock); 1161 1162 ctl_be_block_cw_dispatch(be_lun, io); 1163 1164 mtx_lock(&be_lun->lock); 1165 continue; 1166 } 1167 io = (union ctl_io *)STAILQ_FIRST(&be_lun->input_queue); 1168 if (io != NULL) { 1169 DPRINTF("input queue\n"); 1170 1171 STAILQ_REMOVE(&be_lun->input_queue, &io->io_hdr, 1172 ctl_io_hdr, links); 1173 mtx_unlock(&be_lun->lock); 1174 1175 /* 1176 * We must drop the lock, since this routine and 1177 * its children may sleep. 1178 */ 1179 ctl_be_block_dispatch(be_lun, io); 1180 1181 mtx_lock(&be_lun->lock); 1182 continue; 1183 } 1184 1185 /* 1186 * If we get here, there is no work left in the queues, so 1187 * just break out and let the task queue go to sleep. 1188 */ 1189 break; 1190 } 1191 mtx_unlock(&be_lun->lock); 1192} 1193 1194/* 1195 * Entry point from CTL to the backend for I/O. We queue everything to a 1196 * work thread, so this just puts the I/O on a queue and wakes up the 1197 * thread. 1198 */ 1199static int 1200ctl_be_block_submit(union ctl_io *io) 1201{ 1202 struct ctl_be_block_lun *be_lun; 1203 struct ctl_be_lun *ctl_be_lun; 1204 int retval; 1205 1206 DPRINTF("entered\n"); 1207 1208 retval = CTL_RETVAL_COMPLETE; 1209 1210 ctl_be_lun = (struct ctl_be_lun *)io->io_hdr.ctl_private[ 1211 CTL_PRIV_BACKEND_LUN].ptr; 1212 be_lun = (struct ctl_be_block_lun *)ctl_be_lun->be_lun; 1213 1214 /* 1215 * Make sure we only get SCSI I/O. 1216 */ 1217 KASSERT(io->io_hdr.io_type == CTL_IO_SCSI, ("Non-SCSI I/O (type " 1218 "%#x) encountered", io->io_hdr.io_type)); 1219 1220 mtx_lock(&be_lun->lock); 1221 /* 1222 * XXX KDM make sure that links is okay to use at this point. 1223 * Otherwise, we either need to add another field to ctl_io_hdr, 1224 * or deal with resource allocation here. 1225 */ 1226 STAILQ_INSERT_TAIL(&be_lun->input_queue, &io->io_hdr, links); 1227 mtx_unlock(&be_lun->lock); 1228 1229 taskqueue_enqueue(be_lun->io_taskqueue, &be_lun->io_task); 1230 1231 return (retval); 1232} 1233 1234static int 1235ctl_be_block_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, 1236 int flag, struct thread *td) 1237{ 1238 struct ctl_be_block_softc *softc; 1239 int error; 1240 1241 softc = &backend_block_softc; 1242 1243 error = 0; 1244 1245 switch (cmd) { 1246 case CTL_LUN_REQ: { 1247 struct ctl_lun_req *lun_req; 1248 1249 lun_req = (struct ctl_lun_req *)addr; 1250 1251 switch (lun_req->reqtype) { 1252 case CTL_LUNREQ_CREATE: 1253 error = ctl_be_block_create(softc, lun_req); 1254 break; 1255 case CTL_LUNREQ_RM: 1256 error = ctl_be_block_rm(softc, lun_req); 1257 break; 1258 case CTL_LUNREQ_MODIFY: 1259 error = ctl_be_block_modify(softc, lun_req); 1260 break; 1261 default: 1262 lun_req->status = CTL_LUN_ERROR; 1263 snprintf(lun_req->error_str, sizeof(lun_req->error_str), 1264 "%s: invalid LUN request type %d", __func__, 1265 lun_req->reqtype); 1266 break; 1267 } 1268 break; 1269 } 1270 default: 1271 error = ENOTTY; 1272 break; 1273 } 1274 1275 return (error); 1276} 1277 1278static int 1279ctl_be_block_open_file(struct ctl_be_block_lun *be_lun, struct ctl_lun_req *req) 1280{ 1281 struct ctl_be_block_filedata *file_data; 1282 struct ctl_lun_create_params *params; 1283 struct vattr vattr; 1284 int error; 1285 1286 error = 0; 1287 file_data = &be_lun->backend.file; 1288 params = &req->reqdata.create; 1289 1290 be_lun->dev_type = CTL_BE_BLOCK_FILE; 1291 be_lun->dispatch = ctl_be_block_dispatch_file; 1292 be_lun->lun_flush = ctl_be_block_flush_file; 1293 1294 error = VOP_GETATTR(be_lun->vn, &vattr, curthread->td_ucred); 1295 if (error != 0) { 1296 snprintf(req->error_str, sizeof(req->error_str), 1297 "error calling VOP_GETATTR() for file %s", 1298 be_lun->dev_path); 1299 return (error); 1300 } 1301 1302 /* 1303 * Verify that we have the ability to upgrade to exclusive 1304 * access on this file so we can trap errors at open instead 1305 * of reporting them during first access. 1306 */ 1307 if (VOP_ISLOCKED(be_lun->vn) != LK_EXCLUSIVE) { 1308 vn_lock(be_lun->vn, LK_UPGRADE | LK_RETRY); 1309 if (be_lun->vn->v_iflag & VI_DOOMED) { 1310 error = EBADF; 1311 snprintf(req->error_str, sizeof(req->error_str), 1312 "error locking file %s", be_lun->dev_path); 1313 return (error); 1314 } 1315 } 1316 1317 1318 file_data->cred = crhold(curthread->td_ucred); 1319 if (params->lun_size_bytes != 0) 1320 be_lun->size_bytes = params->lun_size_bytes; 1321 else 1322 be_lun->size_bytes = vattr.va_size; 1323 /* 1324 * We set the multi thread flag for file operations because all 1325 * filesystems (in theory) are capable of allowing multiple readers 1326 * of a file at once. So we want to get the maximum possible 1327 * concurrency. 1328 */ 1329 be_lun->flags |= CTL_BE_BLOCK_LUN_MULTI_THREAD; 1330 1331 /* 1332 * XXX KDM vattr.va_blocksize may be larger than 512 bytes here. 1333 * With ZFS, it is 131072 bytes. Block sizes that large don't work 1334 * with disklabel and UFS on FreeBSD at least. Large block sizes 1335 * may not work with other OSes as well. So just export a sector 1336 * size of 512 bytes, which should work with any OS or 1337 * application. Since our backing is a file, any block size will 1338 * work fine for the backing store. 1339 */ 1340#if 0 1341 be_lun->blocksize= vattr.va_blocksize; 1342#endif 1343 if (params->blocksize_bytes != 0) 1344 be_lun->blocksize = params->blocksize_bytes; 1345 else 1346 be_lun->blocksize = 512; 1347 1348 /* 1349 * Sanity check. The media size has to be at least one 1350 * sector long. 1351 */ 1352 if (be_lun->size_bytes < be_lun->blocksize) { 1353 error = EINVAL; 1354 snprintf(req->error_str, sizeof(req->error_str), 1355 "file %s size %ju < block size %u", be_lun->dev_path, 1356 (uintmax_t)be_lun->size_bytes, be_lun->blocksize); 1357 } 1358 return (error); 1359} 1360 1361static int 1362ctl_be_block_open_dev(struct ctl_be_block_lun *be_lun, struct ctl_lun_req *req) 1363{ 1364 struct ctl_lun_create_params *params; 1365 struct vattr vattr; 1366 struct cdev *dev; 1367 struct cdevsw *devsw; 1368 int error; 1369 1370 params = &req->reqdata.create; 1371 1372 be_lun->dev_type = CTL_BE_BLOCK_DEV; 1373 be_lun->dispatch = ctl_be_block_dispatch_dev; 1374 be_lun->lun_flush = ctl_be_block_flush_dev; 1375 be_lun->backend.dev.cdev = be_lun->vn->v_rdev; 1376 be_lun->backend.dev.csw = dev_refthread(be_lun->backend.dev.cdev, 1377 &be_lun->backend.dev.dev_ref); 1378 if (be_lun->backend.dev.csw == NULL) 1379 panic("Unable to retrieve device switch"); 1380 1381 error = VOP_GETATTR(be_lun->vn, &vattr, NOCRED); 1382 if (error) { 1383 snprintf(req->error_str, sizeof(req->error_str), 1384 "%s: error getting vnode attributes for device %s", 1385 __func__, be_lun->dev_path); 1386 return (error); 1387 } 1388 1389 dev = be_lun->vn->v_rdev; 1390 devsw = dev->si_devsw; 1391 if (!devsw->d_ioctl) { 1392 snprintf(req->error_str, sizeof(req->error_str), 1393 "%s: no d_ioctl for device %s!", __func__, 1394 be_lun->dev_path); 1395 return (ENODEV); 1396 } 1397 1398 error = devsw->d_ioctl(dev, DIOCGSECTORSIZE, 1399 (caddr_t)&be_lun->blocksize, FREAD, 1400 curthread); 1401 if (error) { 1402 snprintf(req->error_str, sizeof(req->error_str), 1403 "%s: error %d returned for DIOCGSECTORSIZE ioctl " 1404 "on %s!", __func__, error, be_lun->dev_path); 1405 return (error); 1406 } 1407 1408 /* 1409 * If the user has asked for a blocksize that is greater than the 1410 * backing device's blocksize, we can do it only if the blocksize 1411 * the user is asking for is an even multiple of the underlying 1412 * device's blocksize. 1413 */ 1414 if ((params->blocksize_bytes != 0) 1415 && (params->blocksize_bytes > be_lun->blocksize)) { 1416 uint32_t bs_multiple, tmp_blocksize; 1417 1418 bs_multiple = params->blocksize_bytes / be_lun->blocksize; 1419 1420 tmp_blocksize = bs_multiple * be_lun->blocksize; 1421 1422 if (tmp_blocksize == params->blocksize_bytes) { 1423 be_lun->blocksize = params->blocksize_bytes; 1424 } else { 1425 snprintf(req->error_str, sizeof(req->error_str), 1426 "%s: requested blocksize %u is not an even " 1427 "multiple of backing device blocksize %u", 1428 __func__, params->blocksize_bytes, 1429 be_lun->blocksize); 1430 return (EINVAL); 1431 1432 } 1433 } else if ((params->blocksize_bytes != 0) 1434 && (params->blocksize_bytes != be_lun->blocksize)) { 1435 snprintf(req->error_str, sizeof(req->error_str), 1436 "%s: requested blocksize %u < backing device " 1437 "blocksize %u", __func__, params->blocksize_bytes, 1438 be_lun->blocksize); 1439 return (EINVAL); 1440 } 1441 1442 error = devsw->d_ioctl(dev, DIOCGMEDIASIZE, 1443 (caddr_t)&be_lun->size_bytes, FREAD, 1444 curthread); 1445 if (error) { 1446 snprintf(req->error_str, sizeof(req->error_str), 1447 "%s: error %d returned for DIOCGMEDIASIZE " 1448 " ioctl on %s!", __func__, error, 1449 be_lun->dev_path); 1450 return (error); 1451 } 1452 1453 if (params->lun_size_bytes != 0) { 1454 if (params->lun_size_bytes > be_lun->size_bytes) { 1455 snprintf(req->error_str, sizeof(req->error_str), 1456 "%s: requested LUN size %ju > backing device " 1457 "size %ju", __func__, 1458 (uintmax_t)params->lun_size_bytes, 1459 (uintmax_t)be_lun->size_bytes); 1460 return (EINVAL); 1461 } 1462 1463 be_lun->size_bytes = params->lun_size_bytes; 1464 } 1465 1466 return (0); 1467} 1468 1469static int 1470ctl_be_block_close(struct ctl_be_block_lun *be_lun) 1471{ 1472 DROP_GIANT(); 1473 if (be_lun->vn) { 1474 int flags = FREAD | FWRITE; 1475 1476 switch (be_lun->dev_type) { 1477 case CTL_BE_BLOCK_DEV: 1478 if (be_lun->backend.dev.csw) { 1479 dev_relthread(be_lun->backend.dev.cdev, 1480 be_lun->backend.dev.dev_ref); 1481 be_lun->backend.dev.csw = NULL; 1482 be_lun->backend.dev.cdev = NULL; 1483 } 1484 break; 1485 case CTL_BE_BLOCK_FILE: 1486 break; 1487 case CTL_BE_BLOCK_NONE: 1488 break; 1489 default: 1490 panic("Unexpected backend type."); 1491 break; 1492 } 1493 1494 (void)vn_close(be_lun->vn, flags, NOCRED, curthread); 1495 be_lun->vn = NULL; 1496 1497 switch (be_lun->dev_type) { 1498 case CTL_BE_BLOCK_DEV: 1499 break; 1500 case CTL_BE_BLOCK_FILE: 1501 if (be_lun->backend.file.cred != NULL) { 1502 crfree(be_lun->backend.file.cred); 1503 be_lun->backend.file.cred = NULL; 1504 } 1505 break; 1506 case CTL_BE_BLOCK_NONE: 1507 break; 1508 default: 1509 panic("Unexpected backend type."); 1510 break; 1511 } 1512 } 1513 PICKUP_GIANT(); 1514 1515 return (0); 1516} 1517 1518static int 1519ctl_be_block_open(struct ctl_be_block_softc *softc, 1520 struct ctl_be_block_lun *be_lun, struct ctl_lun_req *req) 1521{ 1522 struct nameidata nd; 1523 int flags; 1524 int error; 1525 1526 /* 1527 * XXX KDM allow a read-only option? 1528 */ 1529 flags = FREAD | FWRITE; 1530 error = 0; 1531 1532 if (rootvnode == NULL) { 1533 snprintf(req->error_str, sizeof(req->error_str), 1534 "%s: Root filesystem is not mounted", __func__); 1535 return (1); 1536 } 1537 1538 if (!curthread->td_proc->p_fd->fd_cdir) { 1539 curthread->td_proc->p_fd->fd_cdir = rootvnode; 1540 VREF(rootvnode); 1541 } 1542 if (!curthread->td_proc->p_fd->fd_rdir) { 1543 curthread->td_proc->p_fd->fd_rdir = rootvnode; 1544 VREF(rootvnode); 1545 } 1546 if (!curthread->td_proc->p_fd->fd_jdir) { 1547 curthread->td_proc->p_fd->fd_jdir = rootvnode; 1548 VREF(rootvnode); 1549 } 1550 1551 again: 1552 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, be_lun->dev_path, curthread); 1553 error = vn_open(&nd, &flags, 0, NULL); 1554 if (error) { 1555 /* 1556 * This is the only reasonable guess we can make as far as 1557 * path if the user doesn't give us a fully qualified path. 1558 * If they want to specify a file, they need to specify the 1559 * full path. 1560 */ 1561 if (be_lun->dev_path[0] != '/') { 1562 char *dev_path = "/dev/"; 1563 char *dev_name; 1564 1565 /* Try adding device path at beginning of name */ 1566 dev_name = malloc(strlen(be_lun->dev_path) 1567 + strlen(dev_path) + 1, 1568 M_CTLBLK, M_WAITOK); 1569 if (dev_name) { 1570 sprintf(dev_name, "%s%s", dev_path, 1571 be_lun->dev_path); 1572 free(be_lun->dev_path, M_CTLBLK); 1573 be_lun->dev_path = dev_name; 1574 goto again; 1575 } 1576 } 1577 snprintf(req->error_str, sizeof(req->error_str), 1578 "%s: error opening %s", __func__, be_lun->dev_path); 1579 return (error); 1580 } 1581 1582 NDFREE(&nd, NDF_ONLY_PNBUF); 1583 1584 be_lun->vn = nd.ni_vp; 1585 1586 /* We only support disks and files. */ 1587 if (vn_isdisk(be_lun->vn, &error)) { 1588 error = ctl_be_block_open_dev(be_lun, req); 1589 } else if (be_lun->vn->v_type == VREG) { 1590 error = ctl_be_block_open_file(be_lun, req); 1591 } else { 1592 error = EINVAL; 1593 snprintf(req->error_str, sizeof(req->error_str), 1594 "%s is not a disk or plain file", be_lun->dev_path); 1595 } 1596 VOP_UNLOCK(be_lun->vn, 0); 1597 1598 if (error != 0) { 1599 ctl_be_block_close(be_lun); 1600 return (error); 1601 } 1602 1603 be_lun->blocksize_shift = fls(be_lun->blocksize) - 1; 1604 be_lun->size_blocks = be_lun->size_bytes >> be_lun->blocksize_shift; 1605 1606 return (0); 1607} 1608 1609static int 1610ctl_be_block_mem_ctor(void *mem, int size, void *arg, int flags) 1611{ 1612 return (0); 1613} 1614 1615static void 1616ctl_be_block_mem_dtor(void *mem, int size, void *arg) 1617{ 1618 bzero(mem, size); 1619} 1620 1621static int 1622ctl_be_block_create(struct ctl_be_block_softc *softc, struct ctl_lun_req *req) 1623{ 1624 struct ctl_be_block_lun *be_lun; 1625 struct ctl_lun_create_params *params; 1626 struct ctl_be_arg *file_arg; 1627 char tmpstr[32]; 1628 int retval, num_threads; 1629 int i; 1630 1631 params = &req->reqdata.create; 1632 retval = 0; 1633 1634 num_threads = cbb_num_threads; 1635 1636 file_arg = NULL; 1637 1638 be_lun = malloc(sizeof(*be_lun), M_CTLBLK, M_ZERO | M_WAITOK); 1639 1640 be_lun->softc = softc; 1641 STAILQ_INIT(&be_lun->input_queue); 1642 STAILQ_INIT(&be_lun->config_write_queue); 1643 STAILQ_INIT(&be_lun->datamove_queue); 1644 STAILQ_INIT(&be_lun->ctl_be_lun.options); 1645 sprintf(be_lun->lunname, "cblk%d", softc->num_luns); 1646 mtx_init(&be_lun->lock, be_lun->lunname, NULL, MTX_DEF); 1647 1648 be_lun->lun_zone = uma_zcreate(be_lun->lunname, MAXPHYS, 1649 ctl_be_block_mem_ctor, ctl_be_block_mem_dtor, NULL, NULL, 1650 /*align*/ 0, /*flags*/0); 1651 1652 if (be_lun->lun_zone == NULL) { 1653 snprintf(req->error_str, sizeof(req->error_str), 1654 "%s: error allocating UMA zone", __func__); 1655 goto bailout_error; 1656 } 1657 1658 if (params->flags & CTL_LUN_FLAG_DEV_TYPE) 1659 be_lun->ctl_be_lun.lun_type = params->device_type; 1660 else 1661 be_lun->ctl_be_lun.lun_type = T_DIRECT; 1662 1663 if (be_lun->ctl_be_lun.lun_type == T_DIRECT) { 1664 for (i = 0; i < req->num_be_args; i++) { 1665 if (strcmp(req->kern_be_args[i].kname, "file") == 0) { 1666 file_arg = &req->kern_be_args[i]; 1667 break; 1668 } 1669 } 1670 1671 if (file_arg == NULL) { 1672 snprintf(req->error_str, sizeof(req->error_str), 1673 "%s: no file argument specified", __func__); 1674 goto bailout_error; 1675 } 1676 1677 be_lun->dev_path = malloc(file_arg->vallen, M_CTLBLK, 1678 M_WAITOK | M_ZERO); 1679 1680 strlcpy(be_lun->dev_path, (char *)file_arg->kvalue, 1681 file_arg->vallen); 1682 1683 retval = ctl_be_block_open(softc, be_lun, req); 1684 if (retval != 0) { 1685 retval = 0; 1686 goto bailout_error; 1687 } 1688 1689 /* 1690 * Tell the user the size of the file/device. 1691 */ 1692 params->lun_size_bytes = be_lun->size_bytes; 1693 1694 /* 1695 * The maximum LBA is the size - 1. 1696 */ 1697 be_lun->ctl_be_lun.maxlba = be_lun->size_blocks - 1; 1698 } else { 1699 /* 1700 * For processor devices, we don't have any size. 1701 */ 1702 be_lun->blocksize = 0; 1703 be_lun->size_blocks = 0; 1704 be_lun->size_bytes = 0; 1705 be_lun->ctl_be_lun.maxlba = 0; 1706 params->lun_size_bytes = 0; 1707 1708 /* 1709 * Default to just 1 thread for processor devices. 1710 */ 1711 num_threads = 1; 1712 } 1713 1714 /* 1715 * XXX This searching loop might be refactored to be combined with 1716 * the loop above, 1717 */ 1718 for (i = 0; i < req->num_be_args; i++) { 1719 if (strcmp(req->kern_be_args[i].kname, "num_threads") == 0) { 1720 struct ctl_be_arg *thread_arg; 1721 char num_thread_str[16]; 1722 int tmp_num_threads; 1723 1724 1725 thread_arg = &req->kern_be_args[i]; 1726 1727 strlcpy(num_thread_str, (char *)thread_arg->kvalue, 1728 min(thread_arg->vallen, 1729 sizeof(num_thread_str))); 1730 1731 tmp_num_threads = strtol(num_thread_str, NULL, 0); 1732 1733 /* 1734 * We don't let the user specify less than one 1735 * thread, but hope he's clueful enough not to 1736 * specify 1000 threads. 1737 */ 1738 if (tmp_num_threads < 1) { 1739 snprintf(req->error_str, sizeof(req->error_str), 1740 "%s: invalid number of threads %s", 1741 __func__, num_thread_str); 1742 goto bailout_error; 1743 } 1744 1745 num_threads = tmp_num_threads; 1746 } else if (strcmp(req->kern_be_args[i].kname, "file") != 0 && 1747 strcmp(req->kern_be_args[i].kname, "dev") != 0) { 1748 struct ctl_be_lun_option *opt; 1749 1750 opt = malloc(sizeof(*opt), M_CTLBLK, M_WAITOK); 1751 opt->name = malloc(strlen(req->kern_be_args[i].kname) + 1, M_CTLBLK, M_WAITOK); 1752 strcpy(opt->name, req->kern_be_args[i].kname); 1753 opt->value = malloc(strlen(req->kern_be_args[i].kvalue) + 1, M_CTLBLK, M_WAITOK); 1754 strcpy(opt->value, req->kern_be_args[i].kvalue); 1755 STAILQ_INSERT_TAIL(&be_lun->ctl_be_lun.options, opt, links); 1756 } 1757 } 1758 1759 be_lun->flags = CTL_BE_BLOCK_LUN_UNCONFIGURED; 1760 be_lun->ctl_be_lun.flags = CTL_LUN_FLAG_PRIMARY; 1761 be_lun->ctl_be_lun.be_lun = be_lun; 1762 be_lun->ctl_be_lun.blocksize = be_lun->blocksize; 1763 /* Tell the user the blocksize we ended up using */ 1764 params->blocksize_bytes = be_lun->blocksize; 1765 if (params->flags & CTL_LUN_FLAG_ID_REQ) { 1766 be_lun->ctl_be_lun.req_lun_id = params->req_lun_id; 1767 be_lun->ctl_be_lun.flags |= CTL_LUN_FLAG_ID_REQ; 1768 } else 1769 be_lun->ctl_be_lun.req_lun_id = 0; 1770 1771 be_lun->ctl_be_lun.lun_shutdown = ctl_be_block_lun_shutdown; 1772 be_lun->ctl_be_lun.lun_config_status = 1773 ctl_be_block_lun_config_status; 1774 be_lun->ctl_be_lun.be = &ctl_be_block_driver; 1775 1776 if ((params->flags & CTL_LUN_FLAG_SERIAL_NUM) == 0) { 1777 snprintf(tmpstr, sizeof(tmpstr), "MYSERIAL%4d", 1778 softc->num_luns); 1779 strncpy((char *)be_lun->ctl_be_lun.serial_num, tmpstr, 1780 ctl_min(sizeof(be_lun->ctl_be_lun.serial_num), 1781 sizeof(tmpstr))); 1782 1783 /* Tell the user what we used for a serial number */ 1784 strncpy((char *)params->serial_num, tmpstr, 1785 ctl_min(sizeof(params->serial_num), sizeof(tmpstr))); 1786 } else { 1787 strncpy((char *)be_lun->ctl_be_lun.serial_num, 1788 params->serial_num, 1789 ctl_min(sizeof(be_lun->ctl_be_lun.serial_num), 1790 sizeof(params->serial_num))); 1791 } 1792 if ((params->flags & CTL_LUN_FLAG_DEVID) == 0) { 1793 snprintf(tmpstr, sizeof(tmpstr), "MYDEVID%4d", softc->num_luns); 1794 strncpy((char *)be_lun->ctl_be_lun.device_id, tmpstr, 1795 ctl_min(sizeof(be_lun->ctl_be_lun.device_id), 1796 sizeof(tmpstr))); 1797 1798 /* Tell the user what we used for a device ID */ 1799 strncpy((char *)params->device_id, tmpstr, 1800 ctl_min(sizeof(params->device_id), sizeof(tmpstr))); 1801 } else { 1802 strncpy((char *)be_lun->ctl_be_lun.device_id, 1803 params->device_id, 1804 ctl_min(sizeof(be_lun->ctl_be_lun.device_id), 1805 sizeof(params->device_id))); 1806 } 1807 1808 TASK_INIT(&be_lun->io_task, /*priority*/0, ctl_be_block_worker, be_lun); 1809 1810 be_lun->io_taskqueue = taskqueue_create(be_lun->lunname, M_WAITOK, 1811 taskqueue_thread_enqueue, /*context*/&be_lun->io_taskqueue); 1812 1813 if (be_lun->io_taskqueue == NULL) { 1814 snprintf(req->error_str, sizeof(req->error_str), 1815 "%s: Unable to create taskqueue", __func__); 1816 goto bailout_error; 1817 } 1818 1819 /* 1820 * Note that we start the same number of threads by default for 1821 * both the file case and the block device case. For the file 1822 * case, we need multiple threads to allow concurrency, because the 1823 * vnode interface is designed to be a blocking interface. For the 1824 * block device case, ZFS zvols at least will block the caller's 1825 * context in many instances, and so we need multiple threads to 1826 * overcome that problem. Other block devices don't need as many 1827 * threads, but they shouldn't cause too many problems. 1828 * 1829 * If the user wants to just have a single thread for a block 1830 * device, he can specify that when the LUN is created, or change 1831 * the tunable/sysctl to alter the default number of threads. 1832 */ 1833 retval = taskqueue_start_threads(&be_lun->io_taskqueue, 1834 /*num threads*/num_threads, 1835 /*priority*/PWAIT, 1836 /*thread name*/ 1837 "%s taskq", be_lun->lunname); 1838 1839 if (retval != 0) 1840 goto bailout_error; 1841 1842 be_lun->num_threads = num_threads; 1843 1844 mtx_lock(&softc->lock); 1845 softc->num_luns++; 1846 STAILQ_INSERT_TAIL(&softc->lun_list, be_lun, links); 1847 1848 mtx_unlock(&softc->lock); 1849 1850 retval = ctl_add_lun(&be_lun->ctl_be_lun); 1851 if (retval != 0) { 1852 mtx_lock(&softc->lock); 1853 STAILQ_REMOVE(&softc->lun_list, be_lun, ctl_be_block_lun, 1854 links); 1855 softc->num_luns--; 1856 mtx_unlock(&softc->lock); 1857 snprintf(req->error_str, sizeof(req->error_str), 1858 "%s: ctl_add_lun() returned error %d, see dmesg for " 1859 "details", __func__, retval); 1860 retval = 0; 1861 goto bailout_error; 1862 } 1863 1864 mtx_lock(&softc->lock); 1865 1866 /* 1867 * Tell the config_status routine that we're waiting so it won't 1868 * clean up the LUN in the event of an error. 1869 */ 1870 be_lun->flags |= CTL_BE_BLOCK_LUN_WAITING; 1871 1872 while (be_lun->flags & CTL_BE_BLOCK_LUN_UNCONFIGURED) { 1873 retval = msleep(be_lun, &softc->lock, PCATCH, "ctlblk", 0); 1874 if (retval == EINTR) 1875 break; 1876 } 1877 be_lun->flags &= ~CTL_BE_BLOCK_LUN_WAITING; 1878 1879 if (be_lun->flags & CTL_BE_BLOCK_LUN_CONFIG_ERR) { 1880 snprintf(req->error_str, sizeof(req->error_str), 1881 "%s: LUN configuration error, see dmesg for details", 1882 __func__); 1883 STAILQ_REMOVE(&softc->lun_list, be_lun, ctl_be_block_lun, 1884 links); 1885 softc->num_luns--; 1886 mtx_unlock(&softc->lock); 1887 goto bailout_error; 1888 } else { 1889 params->req_lun_id = be_lun->ctl_be_lun.lun_id; 1890 } 1891 1892 mtx_unlock(&softc->lock); 1893 1894 be_lun->disk_stats = devstat_new_entry("cbb", params->req_lun_id, 1895 be_lun->blocksize, 1896 DEVSTAT_ALL_SUPPORTED, 1897 be_lun->ctl_be_lun.lun_type 1898 | DEVSTAT_TYPE_IF_OTHER, 1899 DEVSTAT_PRIORITY_OTHER); 1900 1901 1902 req->status = CTL_LUN_OK; 1903 1904 return (retval); 1905 1906bailout_error: 1907 req->status = CTL_LUN_ERROR; 1908 1909 ctl_be_block_close(be_lun); 1910 1911 free(be_lun->dev_path, M_CTLBLK); 1912 free(be_lun, M_CTLBLK); 1913 1914 return (retval); 1915} 1916 1917static int 1918ctl_be_block_rm(struct ctl_be_block_softc *softc, struct ctl_lun_req *req) 1919{ 1920 struct ctl_lun_rm_params *params; 1921 struct ctl_be_block_lun *be_lun; 1922 int retval; 1923 1924 params = &req->reqdata.rm; 1925 1926 mtx_lock(&softc->lock); 1927 1928 be_lun = NULL; 1929 1930 STAILQ_FOREACH(be_lun, &softc->lun_list, links) { 1931 if (be_lun->ctl_be_lun.lun_id == params->lun_id) 1932 break; 1933 } 1934 mtx_unlock(&softc->lock); 1935 1936 if (be_lun == NULL) { 1937 snprintf(req->error_str, sizeof(req->error_str), 1938 "%s: LUN %u is not managed by the block backend", 1939 __func__, params->lun_id); 1940 goto bailout_error; 1941 } 1942 1943 retval = ctl_disable_lun(&be_lun->ctl_be_lun); 1944 1945 if (retval != 0) { 1946 snprintf(req->error_str, sizeof(req->error_str), 1947 "%s: error %d returned from ctl_disable_lun() for " 1948 "LUN %d", __func__, retval, params->lun_id); 1949 goto bailout_error; 1950 1951 } 1952 1953 retval = ctl_invalidate_lun(&be_lun->ctl_be_lun); 1954 if (retval != 0) { 1955 snprintf(req->error_str, sizeof(req->error_str), 1956 "%s: error %d returned from ctl_invalidate_lun() for " 1957 "LUN %d", __func__, retval, params->lun_id); 1958 goto bailout_error; 1959 } 1960 1961 mtx_lock(&softc->lock); 1962 1963 be_lun->flags |= CTL_BE_BLOCK_LUN_WAITING; 1964 1965 while ((be_lun->flags & CTL_BE_BLOCK_LUN_UNCONFIGURED) == 0) { 1966 retval = msleep(be_lun, &softc->lock, PCATCH, "ctlblk", 0); 1967 if (retval == EINTR) 1968 break; 1969 } 1970 1971 be_lun->flags &= ~CTL_BE_BLOCK_LUN_WAITING; 1972 1973 if ((be_lun->flags & CTL_BE_BLOCK_LUN_UNCONFIGURED) == 0) { 1974 snprintf(req->error_str, sizeof(req->error_str), 1975 "%s: interrupted waiting for LUN to be freed", 1976 __func__); 1977 mtx_unlock(&softc->lock); 1978 goto bailout_error; 1979 } 1980 1981 STAILQ_REMOVE(&softc->lun_list, be_lun, ctl_be_block_lun, links); 1982 1983 softc->num_luns--; 1984 mtx_unlock(&softc->lock); 1985 1986 taskqueue_drain(be_lun->io_taskqueue, &be_lun->io_task); 1987 1988 taskqueue_free(be_lun->io_taskqueue); 1989 1990 ctl_be_block_close(be_lun); 1991 1992 if (be_lun->disk_stats != NULL) 1993 devstat_remove_entry(be_lun->disk_stats); 1994 1995 uma_zdestroy(be_lun->lun_zone); 1996 1997 free(be_lun->dev_path, M_CTLBLK); 1998 1999 free(be_lun, M_CTLBLK); 2000 2001 req->status = CTL_LUN_OK; 2002 2003 return (0); 2004 2005bailout_error: 2006 2007 req->status = CTL_LUN_ERROR; 2008 2009 return (0); 2010} 2011 2012static int 2013ctl_be_block_modify_file(struct ctl_be_block_lun *be_lun, 2014 struct ctl_lun_req *req) 2015{ 2016 struct vattr vattr; 2017 int error; 2018 struct ctl_lun_modify_params *params; 2019 2020 params = &req->reqdata.modify; 2021 2022 if (params->lun_size_bytes != 0) { 2023 be_lun->size_bytes = params->lun_size_bytes; 2024 } else { 2025 error = VOP_GETATTR(be_lun->vn, &vattr, curthread->td_ucred); 2026 if (error != 0) { 2027 snprintf(req->error_str, sizeof(req->error_str), 2028 "error calling VOP_GETATTR() for file %s", 2029 be_lun->dev_path); 2030 return (error); 2031 } 2032 2033 be_lun->size_bytes = vattr.va_size; 2034 } 2035 2036 return (0); 2037} 2038 2039static int 2040ctl_be_block_modify_dev(struct ctl_be_block_lun *be_lun, 2041 struct ctl_lun_req *req) 2042{ 2043 struct cdev *dev; 2044 struct cdevsw *devsw; 2045 int error; 2046 struct ctl_lun_modify_params *params; 2047 uint64_t size_bytes; 2048 2049 params = &req->reqdata.modify; 2050 2051 dev = be_lun->vn->v_rdev; 2052 devsw = dev->si_devsw; 2053 if (!devsw->d_ioctl) { 2054 snprintf(req->error_str, sizeof(req->error_str), 2055 "%s: no d_ioctl for device %s!", __func__, 2056 be_lun->dev_path); 2057 return (ENODEV); 2058 } 2059 2060 error = devsw->d_ioctl(dev, DIOCGMEDIASIZE, 2061 (caddr_t)&size_bytes, FREAD, 2062 curthread); 2063 if (error) { 2064 snprintf(req->error_str, sizeof(req->error_str), 2065 "%s: error %d returned for DIOCGMEDIASIZE ioctl " 2066 "on %s!", __func__, error, be_lun->dev_path); 2067 return (error); 2068 } 2069 2070 if (params->lun_size_bytes != 0) { 2071 if (params->lun_size_bytes > size_bytes) { 2072 snprintf(req->error_str, sizeof(req->error_str), 2073 "%s: requested LUN size %ju > backing device " 2074 "size %ju", __func__, 2075 (uintmax_t)params->lun_size_bytes, 2076 (uintmax_t)size_bytes); 2077 return (EINVAL); 2078 } 2079 2080 be_lun->size_bytes = params->lun_size_bytes; 2081 } else { 2082 be_lun->size_bytes = size_bytes; 2083 } 2084 2085 return (0); 2086} 2087 2088static int 2089ctl_be_block_modify(struct ctl_be_block_softc *softc, struct ctl_lun_req *req) 2090{ 2091 struct ctl_lun_modify_params *params; 2092 struct ctl_be_block_lun *be_lun; 2093 int error; 2094 2095 params = &req->reqdata.modify; 2096 2097 mtx_lock(&softc->lock); 2098 2099 be_lun = NULL; 2100 2101 STAILQ_FOREACH(be_lun, &softc->lun_list, links) { 2102 if (be_lun->ctl_be_lun.lun_id == params->lun_id) 2103 break; 2104 } 2105 mtx_unlock(&softc->lock); 2106 2107 if (be_lun == NULL) { 2108 snprintf(req->error_str, sizeof(req->error_str), 2109 "%s: LUN %u is not managed by the block backend", 2110 __func__, params->lun_id); 2111 goto bailout_error; 2112 } 2113 2114 if (params->lun_size_bytes != 0) { 2115 if (params->lun_size_bytes < be_lun->blocksize) { 2116 snprintf(req->error_str, sizeof(req->error_str), 2117 "%s: LUN size %ju < blocksize %u", __func__, 2118 params->lun_size_bytes, be_lun->blocksize); 2119 goto bailout_error; 2120 } 2121 } 2122 2123 vn_lock(be_lun->vn, LK_SHARED | LK_RETRY); 2124 2125 if (be_lun->vn->v_type == VREG) 2126 error = ctl_be_block_modify_file(be_lun, req); 2127 else 2128 error = ctl_be_block_modify_dev(be_lun, req); 2129 2130 VOP_UNLOCK(be_lun->vn, 0); 2131 2132 if (error != 0) 2133 goto bailout_error; 2134 2135 be_lun->size_blocks = be_lun->size_bytes >> be_lun->blocksize_shift; 2136 2137 /* 2138 * The maximum LBA is the size - 1. 2139 * 2140 * XXX: Note that this field is being updated without locking, 2141 * which might cause problems on 32-bit architectures. 2142 */ 2143 be_lun->ctl_be_lun.maxlba = be_lun->size_blocks - 1; 2144 ctl_lun_capacity_changed(&be_lun->ctl_be_lun); 2145 2146 /* Tell the user the exact size we ended up using */ 2147 params->lun_size_bytes = be_lun->size_bytes; 2148 2149 req->status = CTL_LUN_OK; 2150 2151 return (0); 2152 2153bailout_error: 2154 req->status = CTL_LUN_ERROR; 2155 2156 return (0); 2157} 2158 2159static void 2160ctl_be_block_lun_shutdown(void *be_lun) 2161{ 2162 struct ctl_be_block_lun *lun; 2163 struct ctl_be_block_softc *softc; 2164 2165 lun = (struct ctl_be_block_lun *)be_lun; 2166 2167 softc = lun->softc; 2168 2169 mtx_lock(&softc->lock); 2170 lun->flags |= CTL_BE_BLOCK_LUN_UNCONFIGURED; 2171 if (lun->flags & CTL_BE_BLOCK_LUN_WAITING) 2172 wakeup(lun); 2173 mtx_unlock(&softc->lock); 2174 2175} 2176 2177static void 2178ctl_be_block_lun_config_status(void *be_lun, ctl_lun_config_status status) 2179{ 2180 struct ctl_be_block_lun *lun; 2181 struct ctl_be_block_softc *softc; 2182 2183 lun = (struct ctl_be_block_lun *)be_lun; 2184 softc = lun->softc; 2185 2186 if (status == CTL_LUN_CONFIG_OK) { 2187 mtx_lock(&softc->lock); 2188 lun->flags &= ~CTL_BE_BLOCK_LUN_UNCONFIGURED; 2189 if (lun->flags & CTL_BE_BLOCK_LUN_WAITING) 2190 wakeup(lun); 2191 mtx_unlock(&softc->lock); 2192 2193 /* 2194 * We successfully added the LUN, attempt to enable it. 2195 */ 2196 if (ctl_enable_lun(&lun->ctl_be_lun) != 0) { 2197 printf("%s: ctl_enable_lun() failed!\n", __func__); 2198 if (ctl_invalidate_lun(&lun->ctl_be_lun) != 0) { 2199 printf("%s: ctl_invalidate_lun() failed!\n", 2200 __func__); 2201 } 2202 } 2203 2204 return; 2205 } 2206 2207 2208 mtx_lock(&softc->lock); 2209 lun->flags &= ~CTL_BE_BLOCK_LUN_UNCONFIGURED; 2210 lun->flags |= CTL_BE_BLOCK_LUN_CONFIG_ERR; 2211 wakeup(lun); 2212 mtx_unlock(&softc->lock); 2213} 2214 2215 2216static int 2217ctl_be_block_config_write(union ctl_io *io) 2218{ 2219 struct ctl_be_block_lun *be_lun; 2220 struct ctl_be_lun *ctl_be_lun; 2221 int retval; 2222 2223 retval = 0; 2224 2225 DPRINTF("entered\n"); 2226 2227 ctl_be_lun = (struct ctl_be_lun *)io->io_hdr.ctl_private[ 2228 CTL_PRIV_BACKEND_LUN].ptr; 2229 be_lun = (struct ctl_be_block_lun *)ctl_be_lun->be_lun; 2230 2231 switch (io->scsiio.cdb[0]) { 2232 case SYNCHRONIZE_CACHE: 2233 case SYNCHRONIZE_CACHE_16: 2234 /* 2235 * The upper level CTL code will filter out any CDBs with 2236 * the immediate bit set and return the proper error. 2237 * 2238 * We don't really need to worry about what LBA range the 2239 * user asked to be synced out. When they issue a sync 2240 * cache command, we'll sync out the whole thing. 2241 */ 2242 mtx_lock(&be_lun->lock); 2243 STAILQ_INSERT_TAIL(&be_lun->config_write_queue, &io->io_hdr, 2244 links); 2245 mtx_unlock(&be_lun->lock); 2246 taskqueue_enqueue(be_lun->io_taskqueue, &be_lun->io_task); 2247 break; 2248 case START_STOP_UNIT: { 2249 struct scsi_start_stop_unit *cdb; 2250 2251 cdb = (struct scsi_start_stop_unit *)io->scsiio.cdb; 2252 2253 if (cdb->how & SSS_START) 2254 retval = ctl_start_lun(ctl_be_lun); 2255 else { 2256 retval = ctl_stop_lun(ctl_be_lun); 2257 /* 2258 * XXX KDM Copan-specific offline behavior. 2259 * Figure out a reasonable way to port this? 2260 */ 2261#ifdef NEEDTOPORT 2262 if ((retval == 0) 2263 && (cdb->byte2 & SSS_ONOFFLINE)) 2264 retval = ctl_lun_offline(ctl_be_lun); 2265#endif 2266 } 2267 2268 /* 2269 * In general, the above routines should not fail. They 2270 * just set state for the LUN. So we've got something 2271 * pretty wrong here if we can't start or stop the LUN. 2272 */ 2273 if (retval != 0) { 2274 ctl_set_internal_failure(&io->scsiio, 2275 /*sks_valid*/ 1, 2276 /*retry_count*/ 0xf051); 2277 retval = CTL_RETVAL_COMPLETE; 2278 } else { 2279 ctl_set_success(&io->scsiio); 2280 } 2281 ctl_config_write_done(io); 2282 break; 2283 } 2284 default: 2285 ctl_set_invalid_opcode(&io->scsiio); 2286 ctl_config_write_done(io); 2287 retval = CTL_RETVAL_COMPLETE; 2288 break; 2289 } 2290 2291 return (retval); 2292 2293} 2294 2295static int 2296ctl_be_block_config_read(union ctl_io *io) 2297{ 2298 return (0); 2299} 2300 2301static int 2302ctl_be_block_lun_info(void *be_lun, struct sbuf *sb) 2303{ 2304 struct ctl_be_block_lun *lun; 2305 int retval; 2306 2307 lun = (struct ctl_be_block_lun *)be_lun; 2308 retval = 0; 2309 2310 retval = sbuf_printf(sb, "<num_threads>"); 2311 2312 if (retval != 0) 2313 goto bailout; 2314 2315 retval = sbuf_printf(sb, "%d", lun->num_threads); 2316 2317 if (retval != 0) 2318 goto bailout; 2319 2320 retval = sbuf_printf(sb, "</num_threads>"); 2321 2322 /* 2323 * For processor devices, we don't have a path variable. 2324 */ 2325 if ((retval != 0) 2326 || (lun->dev_path == NULL)) 2327 goto bailout; 2328 2329 retval = sbuf_printf(sb, "<file>"); 2330 2331 if (retval != 0) 2332 goto bailout; 2333 2334 retval = ctl_sbuf_printf_esc(sb, lun->dev_path); 2335 2336 if (retval != 0) 2337 goto bailout; 2338 2339 retval = sbuf_printf(sb, "</file>\n"); 2340 2341bailout: 2342 2343 return (retval); 2344} 2345 2346int 2347ctl_be_block_init(void) 2348{ 2349 struct ctl_be_block_softc *softc; 2350 int retval; 2351 2352 softc = &backend_block_softc; 2353 retval = 0; 2354 2355 mtx_init(&softc->lock, "ctlblk", NULL, MTX_DEF); 2356 STAILQ_INIT(&softc->beio_free_queue); 2357 STAILQ_INIT(&softc->disk_list); 2358 STAILQ_INIT(&softc->lun_list); 2359 ctl_grow_beio(softc, 200); 2360 2361 return (retval); 2362} 2363