ctl_backend_block.c revision 287967
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: head/sys/cam/ctl/ctl_backend_block.c 287967 2015-09-18 19:43:14Z mav $"); 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/filio.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_ioctl.h> 88#include <cam/ctl/ctl_ha.h> 89#include <cam/ctl/ctl_scsi_all.h> 90#include <cam/ctl/ctl_private.h> 91#include <cam/ctl/ctl_error.h> 92 93/* 94 * The idea here is that we'll allocate enough S/G space to hold a 1MB 95 * I/O. If we get an I/O larger than that, we'll split it. 96 */ 97#define CTLBLK_HALF_IO_SIZE (512 * 1024) 98#define CTLBLK_MAX_IO_SIZE (CTLBLK_HALF_IO_SIZE * 2) 99#define CTLBLK_MAX_SEG MAXPHYS 100#define CTLBLK_HALF_SEGS MAX(CTLBLK_HALF_IO_SIZE / CTLBLK_MAX_SEG, 1) 101#define CTLBLK_MAX_SEGS (CTLBLK_HALF_SEGS * 2) 102 103#ifdef CTLBLK_DEBUG 104#define DPRINTF(fmt, args...) \ 105 printf("cbb(%s:%d): " fmt, __FUNCTION__, __LINE__, ##args) 106#else 107#define DPRINTF(fmt, args...) do {} while(0) 108#endif 109 110#define PRIV(io) \ 111 ((struct ctl_ptr_len_flags *)&(io)->io_hdr.ctl_private[CTL_PRIV_BACKEND]) 112#define ARGS(io) \ 113 ((struct ctl_lba_len_flags *)&(io)->io_hdr.ctl_private[CTL_PRIV_LBA_LEN]) 114 115SDT_PROVIDER_DEFINE(cbb); 116 117typedef enum { 118 CTL_BE_BLOCK_LUN_UNCONFIGURED = 0x01, 119 CTL_BE_BLOCK_LUN_CONFIG_ERR = 0x02, 120 CTL_BE_BLOCK_LUN_WAITING = 0x04, 121} ctl_be_block_lun_flags; 122 123typedef enum { 124 CTL_BE_BLOCK_NONE, 125 CTL_BE_BLOCK_DEV, 126 CTL_BE_BLOCK_FILE 127} ctl_be_block_type; 128 129struct ctl_be_block_filedata { 130 struct ucred *cred; 131}; 132 133union ctl_be_block_bedata { 134 struct ctl_be_block_filedata file; 135}; 136 137struct ctl_be_block_io; 138struct ctl_be_block_lun; 139 140typedef void (*cbb_dispatch_t)(struct ctl_be_block_lun *be_lun, 141 struct ctl_be_block_io *beio); 142typedef uint64_t (*cbb_getattr_t)(struct ctl_be_block_lun *be_lun, 143 const char *attrname); 144 145/* 146 * Backend LUN structure. There is a 1:1 mapping between a block device 147 * and a backend block LUN, and between a backend block LUN and a CTL LUN. 148 */ 149struct ctl_be_block_lun { 150 struct ctl_lun_create_params params; 151 char lunname[32]; 152 char *dev_path; 153 ctl_be_block_type dev_type; 154 struct vnode *vn; 155 union ctl_be_block_bedata backend; 156 cbb_dispatch_t dispatch; 157 cbb_dispatch_t lun_flush; 158 cbb_dispatch_t unmap; 159 cbb_dispatch_t get_lba_status; 160 cbb_getattr_t getattr; 161 uma_zone_t lun_zone; 162 uint64_t size_blocks; 163 uint64_t size_bytes; 164 struct ctl_be_block_softc *softc; 165 struct devstat *disk_stats; 166 ctl_be_block_lun_flags flags; 167 STAILQ_ENTRY(ctl_be_block_lun) links; 168 struct ctl_be_lun cbe_lun; 169 struct taskqueue *io_taskqueue; 170 struct task io_task; 171 int num_threads; 172 STAILQ_HEAD(, ctl_io_hdr) input_queue; 173 STAILQ_HEAD(, ctl_io_hdr) config_read_queue; 174 STAILQ_HEAD(, ctl_io_hdr) config_write_queue; 175 STAILQ_HEAD(, ctl_io_hdr) datamove_queue; 176 struct mtx_padalign io_lock; 177 struct mtx_padalign queue_lock; 178}; 179 180/* 181 * Overall softc structure for the block backend module. 182 */ 183struct ctl_be_block_softc { 184 struct mtx lock; 185 int num_luns; 186 STAILQ_HEAD(, ctl_be_block_lun) lun_list; 187}; 188 189static struct ctl_be_block_softc backend_block_softc; 190 191/* 192 * Per-I/O information. 193 */ 194struct ctl_be_block_io { 195 union ctl_io *io; 196 struct ctl_sg_entry sg_segs[CTLBLK_MAX_SEGS]; 197 struct iovec xiovecs[CTLBLK_MAX_SEGS]; 198 int bio_cmd; 199 int num_segs; 200 int num_bios_sent; 201 int num_bios_done; 202 int send_complete; 203 int num_errors; 204 struct bintime ds_t0; 205 devstat_tag_type ds_tag_type; 206 devstat_trans_flags ds_trans_type; 207 uint64_t io_len; 208 uint64_t io_offset; 209 int io_arg; 210 struct ctl_be_block_softc *softc; 211 struct ctl_be_block_lun *lun; 212 void (*beio_cont)(struct ctl_be_block_io *beio); /* to continue processing */ 213}; 214 215extern struct ctl_softc *control_softc; 216 217static int cbb_num_threads = 14; 218SYSCTL_NODE(_kern_cam_ctl, OID_AUTO, block, CTLFLAG_RD, 0, 219 "CAM Target Layer Block Backend"); 220SYSCTL_INT(_kern_cam_ctl_block, OID_AUTO, num_threads, CTLFLAG_RWTUN, 221 &cbb_num_threads, 0, "Number of threads per backing file"); 222 223static struct ctl_be_block_io *ctl_alloc_beio(struct ctl_be_block_softc *softc); 224static void ctl_free_beio(struct ctl_be_block_io *beio); 225static void ctl_complete_beio(struct ctl_be_block_io *beio); 226static int ctl_be_block_move_done(union ctl_io *io); 227static void ctl_be_block_biodone(struct bio *bio); 228static void ctl_be_block_flush_file(struct ctl_be_block_lun *be_lun, 229 struct ctl_be_block_io *beio); 230static void ctl_be_block_dispatch_file(struct ctl_be_block_lun *be_lun, 231 struct ctl_be_block_io *beio); 232static void ctl_be_block_gls_file(struct ctl_be_block_lun *be_lun, 233 struct ctl_be_block_io *beio); 234static uint64_t ctl_be_block_getattr_file(struct ctl_be_block_lun *be_lun, 235 const char *attrname); 236static void ctl_be_block_flush_dev(struct ctl_be_block_lun *be_lun, 237 struct ctl_be_block_io *beio); 238static void ctl_be_block_unmap_dev(struct ctl_be_block_lun *be_lun, 239 struct ctl_be_block_io *beio); 240static void ctl_be_block_dispatch_dev(struct ctl_be_block_lun *be_lun, 241 struct ctl_be_block_io *beio); 242static uint64_t ctl_be_block_getattr_dev(struct ctl_be_block_lun *be_lun, 243 const char *attrname); 244static void ctl_be_block_cr_dispatch(struct ctl_be_block_lun *be_lun, 245 union ctl_io *io); 246static void ctl_be_block_cw_dispatch(struct ctl_be_block_lun *be_lun, 247 union ctl_io *io); 248static void ctl_be_block_dispatch(struct ctl_be_block_lun *be_lun, 249 union ctl_io *io); 250static void ctl_be_block_worker(void *context, int pending); 251static int ctl_be_block_submit(union ctl_io *io); 252static int ctl_be_block_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, 253 int flag, struct thread *td); 254static int ctl_be_block_open_file(struct ctl_be_block_lun *be_lun, 255 struct ctl_lun_req *req); 256static int ctl_be_block_open_dev(struct ctl_be_block_lun *be_lun, 257 struct ctl_lun_req *req); 258static int ctl_be_block_close(struct ctl_be_block_lun *be_lun); 259static int ctl_be_block_open(struct ctl_be_block_softc *softc, 260 struct ctl_be_block_lun *be_lun, 261 struct ctl_lun_req *req); 262static int ctl_be_block_create(struct ctl_be_block_softc *softc, 263 struct ctl_lun_req *req); 264static int ctl_be_block_rm(struct ctl_be_block_softc *softc, 265 struct ctl_lun_req *req); 266static int ctl_be_block_modify_file(struct ctl_be_block_lun *be_lun, 267 struct ctl_lun_req *req); 268static int ctl_be_block_modify_dev(struct ctl_be_block_lun *be_lun, 269 struct ctl_lun_req *req); 270static int ctl_be_block_modify(struct ctl_be_block_softc *softc, 271 struct ctl_lun_req *req); 272static void ctl_be_block_lun_shutdown(void *be_lun); 273static void ctl_be_block_lun_config_status(void *be_lun, 274 ctl_lun_config_status status); 275static int ctl_be_block_config_write(union ctl_io *io); 276static int ctl_be_block_config_read(union ctl_io *io); 277static int ctl_be_block_lun_info(void *be_lun, struct sbuf *sb); 278static uint64_t ctl_be_block_lun_attr(void *be_lun, const char *attrname); 279int ctl_be_block_init(void); 280 281static struct ctl_backend_driver ctl_be_block_driver = 282{ 283 .name = "block", 284 .flags = CTL_BE_FLAG_HAS_CONFIG, 285 .init = ctl_be_block_init, 286 .data_submit = ctl_be_block_submit, 287 .data_move_done = ctl_be_block_move_done, 288 .config_read = ctl_be_block_config_read, 289 .config_write = ctl_be_block_config_write, 290 .ioctl = ctl_be_block_ioctl, 291 .lun_info = ctl_be_block_lun_info, 292 .lun_attr = ctl_be_block_lun_attr 293}; 294 295MALLOC_DEFINE(M_CTLBLK, "ctlblk", "Memory used for CTL block backend"); 296CTL_BACKEND_DECLARE(cbb, ctl_be_block_driver); 297 298static uma_zone_t beio_zone; 299 300static struct ctl_be_block_io * 301ctl_alloc_beio(struct ctl_be_block_softc *softc) 302{ 303 struct ctl_be_block_io *beio; 304 305 beio = uma_zalloc(beio_zone, M_WAITOK | M_ZERO); 306 beio->softc = softc; 307 return (beio); 308} 309 310static void 311ctl_free_beio(struct ctl_be_block_io *beio) 312{ 313 int duplicate_free; 314 int i; 315 316 duplicate_free = 0; 317 318 for (i = 0; i < beio->num_segs; i++) { 319 if (beio->sg_segs[i].addr == NULL) 320 duplicate_free++; 321 322 uma_zfree(beio->lun->lun_zone, beio->sg_segs[i].addr); 323 beio->sg_segs[i].addr = NULL; 324 325 /* For compare we had two equal S/G lists. */ 326 if (ARGS(beio->io)->flags & CTL_LLF_COMPARE) { 327 uma_zfree(beio->lun->lun_zone, 328 beio->sg_segs[i + CTLBLK_HALF_SEGS].addr); 329 beio->sg_segs[i + CTLBLK_HALF_SEGS].addr = NULL; 330 } 331 } 332 333 if (duplicate_free > 0) { 334 printf("%s: %d duplicate frees out of %d segments\n", __func__, 335 duplicate_free, beio->num_segs); 336 } 337 338 uma_zfree(beio_zone, beio); 339} 340 341static void 342ctl_complete_beio(struct ctl_be_block_io *beio) 343{ 344 union ctl_io *io = beio->io; 345 346 if (beio->beio_cont != NULL) { 347 beio->beio_cont(beio); 348 } else { 349 ctl_free_beio(beio); 350 ctl_data_submit_done(io); 351 } 352} 353 354static size_t 355cmp(uint8_t *a, uint8_t *b, size_t size) 356{ 357 size_t i; 358 359 for (i = 0; i < size; i++) { 360 if (a[i] != b[i]) 361 break; 362 } 363 return (i); 364} 365 366static void 367ctl_be_block_compare(union ctl_io *io) 368{ 369 struct ctl_be_block_io *beio; 370 uint64_t off, res; 371 int i; 372 uint8_t info[8]; 373 374 beio = (struct ctl_be_block_io *)PRIV(io)->ptr; 375 off = 0; 376 for (i = 0; i < beio->num_segs; i++) { 377 res = cmp(beio->sg_segs[i].addr, 378 beio->sg_segs[i + CTLBLK_HALF_SEGS].addr, 379 beio->sg_segs[i].len); 380 off += res; 381 if (res < beio->sg_segs[i].len) 382 break; 383 } 384 if (i < beio->num_segs) { 385 scsi_u64to8b(off, info); 386 ctl_set_sense(&io->scsiio, /*current_error*/ 1, 387 /*sense_key*/ SSD_KEY_MISCOMPARE, 388 /*asc*/ 0x1D, /*ascq*/ 0x00, 389 /*type*/ SSD_ELEM_INFO, 390 /*size*/ sizeof(info), /*data*/ &info, 391 /*type*/ SSD_ELEM_NONE); 392 } else 393 ctl_set_success(&io->scsiio); 394} 395 396static int 397ctl_be_block_move_done(union ctl_io *io) 398{ 399 struct ctl_be_block_io *beio; 400 struct ctl_be_block_lun *be_lun; 401 struct ctl_lba_len_flags *lbalen; 402#ifdef CTL_TIME_IO 403 struct bintime cur_bt; 404#endif 405 406 beio = (struct ctl_be_block_io *)PRIV(io)->ptr; 407 be_lun = beio->lun; 408 409 DPRINTF("entered\n"); 410 411#ifdef CTL_TIME_IO 412 getbintime(&cur_bt); 413 bintime_sub(&cur_bt, &io->io_hdr.dma_start_bt); 414 bintime_add(&io->io_hdr.dma_bt, &cur_bt); 415 io->io_hdr.num_dmas++; 416#endif 417 io->scsiio.kern_rel_offset += io->scsiio.kern_data_len; 418 419 /* 420 * We set status at this point for read commands, and write 421 * commands with errors. 422 */ 423 if (io->io_hdr.flags & CTL_FLAG_ABORT) { 424 ; 425 } else if ((io->io_hdr.port_status == 0) && 426 ((io->io_hdr.status & CTL_STATUS_MASK) == CTL_STATUS_NONE)) { 427 lbalen = ARGS(beio->io); 428 if (lbalen->flags & CTL_LLF_READ) { 429 ctl_set_success(&io->scsiio); 430 } else if (lbalen->flags & CTL_LLF_COMPARE) { 431 /* We have two data blocks ready for comparison. */ 432 ctl_be_block_compare(io); 433 } 434 } else if ((io->io_hdr.port_status != 0) && 435 ((io->io_hdr.status & CTL_STATUS_MASK) == CTL_STATUS_NONE || 436 (io->io_hdr.status & CTL_STATUS_MASK) == CTL_SUCCESS)) { 437 /* 438 * For hardware error sense keys, the sense key 439 * specific value is defined to be a retry count, 440 * but we use it to pass back an internal FETD 441 * error code. XXX KDM Hopefully the FETD is only 442 * using 16 bits for an error code, since that's 443 * all the space we have in the sks field. 444 */ 445 ctl_set_internal_failure(&io->scsiio, 446 /*sks_valid*/ 1, 447 /*retry_count*/ 448 io->io_hdr.port_status); 449 } 450 451 /* 452 * If this is a read, or a write with errors, it is done. 453 */ 454 if ((beio->bio_cmd == BIO_READ) 455 || ((io->io_hdr.flags & CTL_FLAG_ABORT) != 0) 456 || ((io->io_hdr.status & CTL_STATUS_MASK) != CTL_STATUS_NONE)) { 457 ctl_complete_beio(beio); 458 return (0); 459 } 460 461 /* 462 * At this point, we have a write and the DMA completed 463 * successfully. We now have to queue it to the task queue to 464 * execute the backend I/O. That is because we do blocking 465 * memory allocations, and in the file backing case, blocking I/O. 466 * This move done routine is generally called in the SIM's 467 * interrupt context, and therefore we cannot block. 468 */ 469 mtx_lock(&be_lun->queue_lock); 470 /* 471 * XXX KDM make sure that links is okay to use at this point. 472 * Otherwise, we either need to add another field to ctl_io_hdr, 473 * or deal with resource allocation here. 474 */ 475 STAILQ_INSERT_TAIL(&be_lun->datamove_queue, &io->io_hdr, links); 476 mtx_unlock(&be_lun->queue_lock); 477 478 taskqueue_enqueue(be_lun->io_taskqueue, &be_lun->io_task); 479 480 return (0); 481} 482 483static void 484ctl_be_block_biodone(struct bio *bio) 485{ 486 struct ctl_be_block_io *beio; 487 struct ctl_be_block_lun *be_lun; 488 union ctl_io *io; 489 int error; 490 491 beio = bio->bio_caller1; 492 be_lun = beio->lun; 493 io = beio->io; 494 495 DPRINTF("entered\n"); 496 497 error = bio->bio_error; 498 mtx_lock(&be_lun->io_lock); 499 if (error != 0) 500 beio->num_errors++; 501 502 beio->num_bios_done++; 503 504 /* 505 * XXX KDM will this cause WITNESS to complain? Holding a lock 506 * during the free might cause it to complain. 507 */ 508 g_destroy_bio(bio); 509 510 /* 511 * If the send complete bit isn't set, or we aren't the last I/O to 512 * complete, then we're done. 513 */ 514 if ((beio->send_complete == 0) 515 || (beio->num_bios_done < beio->num_bios_sent)) { 516 mtx_unlock(&be_lun->io_lock); 517 return; 518 } 519 520 /* 521 * At this point, we've verified that we are the last I/O to 522 * complete, so it's safe to drop the lock. 523 */ 524 devstat_end_transaction(beio->lun->disk_stats, beio->io_len, 525 beio->ds_tag_type, beio->ds_trans_type, 526 /*now*/ NULL, /*then*/&beio->ds_t0); 527 mtx_unlock(&be_lun->io_lock); 528 529 /* 530 * If there are any errors from the backing device, we fail the 531 * entire I/O with a medium error. 532 */ 533 if (beio->num_errors > 0) { 534 if (error == EOPNOTSUPP) { 535 ctl_set_invalid_opcode(&io->scsiio); 536 } else if (error == ENOSPC || error == EDQUOT) { 537 ctl_set_space_alloc_fail(&io->scsiio); 538 } else if (error == EROFS || error == EACCES) { 539 ctl_set_hw_write_protected(&io->scsiio); 540 } else if (beio->bio_cmd == BIO_FLUSH) { 541 /* XXX KDM is there is a better error here? */ 542 ctl_set_internal_failure(&io->scsiio, 543 /*sks_valid*/ 1, 544 /*retry_count*/ 0xbad2); 545 } else { 546 ctl_set_medium_error(&io->scsiio, 547 beio->bio_cmd == BIO_READ); 548 } 549 ctl_complete_beio(beio); 550 return; 551 } 552 553 /* 554 * If this is a write, a flush, a delete or verify, we're all done. 555 * If this is a read, we can now send the data to the user. 556 */ 557 if ((beio->bio_cmd == BIO_WRITE) 558 || (beio->bio_cmd == BIO_FLUSH) 559 || (beio->bio_cmd == BIO_DELETE) 560 || (ARGS(io)->flags & CTL_LLF_VERIFY)) { 561 ctl_set_success(&io->scsiio); 562 ctl_complete_beio(beio); 563 } else { 564 if ((ARGS(io)->flags & CTL_LLF_READ) && 565 beio->beio_cont == NULL) { 566 ctl_set_success(&io->scsiio); 567 ctl_serseq_done(io); 568 } 569#ifdef CTL_TIME_IO 570 getbintime(&io->io_hdr.dma_start_bt); 571#endif 572 ctl_datamove(io); 573 } 574} 575 576static void 577ctl_be_block_flush_file(struct ctl_be_block_lun *be_lun, 578 struct ctl_be_block_io *beio) 579{ 580 union ctl_io *io = beio->io; 581 struct mount *mountpoint; 582 int error, lock_flags; 583 584 DPRINTF("entered\n"); 585 586 binuptime(&beio->ds_t0); 587 mtx_lock(&be_lun->io_lock); 588 devstat_start_transaction(beio->lun->disk_stats, &beio->ds_t0); 589 mtx_unlock(&be_lun->io_lock); 590 591 (void) vn_start_write(be_lun->vn, &mountpoint, V_WAIT); 592 593 if (MNT_SHARED_WRITES(mountpoint) 594 || ((mountpoint == NULL) 595 && MNT_SHARED_WRITES(be_lun->vn->v_mount))) 596 lock_flags = LK_SHARED; 597 else 598 lock_flags = LK_EXCLUSIVE; 599 600 vn_lock(be_lun->vn, lock_flags | LK_RETRY); 601 602 error = VOP_FSYNC(be_lun->vn, beio->io_arg ? MNT_NOWAIT : MNT_WAIT, 603 curthread); 604 VOP_UNLOCK(be_lun->vn, 0); 605 606 vn_finished_write(mountpoint); 607 608 mtx_lock(&be_lun->io_lock); 609 devstat_end_transaction(beio->lun->disk_stats, beio->io_len, 610 beio->ds_tag_type, beio->ds_trans_type, 611 /*now*/ NULL, /*then*/&beio->ds_t0); 612 mtx_unlock(&be_lun->io_lock); 613 614 if (error == 0) 615 ctl_set_success(&io->scsiio); 616 else { 617 /* XXX KDM is there is a better error here? */ 618 ctl_set_internal_failure(&io->scsiio, 619 /*sks_valid*/ 1, 620 /*retry_count*/ 0xbad1); 621 } 622 623 ctl_complete_beio(beio); 624} 625 626SDT_PROBE_DEFINE1(cbb, kernel, read, file_start, "uint64_t"); 627SDT_PROBE_DEFINE1(cbb, kernel, write, file_start, "uint64_t"); 628SDT_PROBE_DEFINE1(cbb, kernel, read, file_done,"uint64_t"); 629SDT_PROBE_DEFINE1(cbb, kernel, write, file_done, "uint64_t"); 630 631static void 632ctl_be_block_dispatch_file(struct ctl_be_block_lun *be_lun, 633 struct ctl_be_block_io *beio) 634{ 635 struct ctl_be_block_filedata *file_data; 636 union ctl_io *io; 637 struct uio xuio; 638 struct iovec *xiovec; 639 size_t s; 640 int error, flags, i; 641 642 DPRINTF("entered\n"); 643 644 file_data = &be_lun->backend.file; 645 io = beio->io; 646 flags = 0; 647 if (ARGS(io)->flags & CTL_LLF_DPO) 648 flags |= IO_DIRECT; 649 if (beio->bio_cmd == BIO_WRITE && ARGS(io)->flags & CTL_LLF_FUA) 650 flags |= IO_SYNC; 651 652 bzero(&xuio, sizeof(xuio)); 653 if (beio->bio_cmd == BIO_READ) { 654 SDT_PROBE(cbb, kernel, read, file_start, 0, 0, 0, 0, 0); 655 xuio.uio_rw = UIO_READ; 656 } else { 657 SDT_PROBE(cbb, kernel, write, file_start, 0, 0, 0, 0, 0); 658 xuio.uio_rw = UIO_WRITE; 659 } 660 xuio.uio_offset = beio->io_offset; 661 xuio.uio_resid = beio->io_len; 662 xuio.uio_segflg = UIO_SYSSPACE; 663 xuio.uio_iov = beio->xiovecs; 664 xuio.uio_iovcnt = beio->num_segs; 665 xuio.uio_td = curthread; 666 667 for (i = 0, xiovec = xuio.uio_iov; i < xuio.uio_iovcnt; i++, xiovec++) { 668 xiovec->iov_base = beio->sg_segs[i].addr; 669 xiovec->iov_len = beio->sg_segs[i].len; 670 } 671 672 binuptime(&beio->ds_t0); 673 mtx_lock(&be_lun->io_lock); 674 devstat_start_transaction(beio->lun->disk_stats, &beio->ds_t0); 675 mtx_unlock(&be_lun->io_lock); 676 677 if (beio->bio_cmd == BIO_READ) { 678 vn_lock(be_lun->vn, LK_SHARED | LK_RETRY); 679 680 /* 681 * UFS pays attention to IO_DIRECT for reads. If the 682 * DIRECTIO option is configured into the kernel, it calls 683 * ffs_rawread(). But that only works for single-segment 684 * uios with user space addresses. In our case, with a 685 * kernel uio, it still reads into the buffer cache, but it 686 * will just try to release the buffer from the cache later 687 * on in ffs_read(). 688 * 689 * ZFS does not pay attention to IO_DIRECT for reads. 690 * 691 * UFS does not pay attention to IO_SYNC for reads. 692 * 693 * ZFS pays attention to IO_SYNC (which translates into the 694 * Solaris define FRSYNC for zfs_read()) for reads. It 695 * attempts to sync the file before reading. 696 */ 697 error = VOP_READ(be_lun->vn, &xuio, flags, file_data->cred); 698 699 VOP_UNLOCK(be_lun->vn, 0); 700 SDT_PROBE(cbb, kernel, read, file_done, 0, 0, 0, 0, 0); 701 if (error == 0 && xuio.uio_resid > 0) { 702 /* 703 * If we red less then requested (EOF), then 704 * we should clean the rest of the buffer. 705 */ 706 s = beio->io_len - xuio.uio_resid; 707 for (i = 0; i < beio->num_segs; i++) { 708 if (s >= beio->sg_segs[i].len) { 709 s -= beio->sg_segs[i].len; 710 continue; 711 } 712 bzero((uint8_t *)beio->sg_segs[i].addr + s, 713 beio->sg_segs[i].len - s); 714 s = 0; 715 } 716 } 717 } else { 718 struct mount *mountpoint; 719 int lock_flags; 720 721 (void)vn_start_write(be_lun->vn, &mountpoint, V_WAIT); 722 723 if (MNT_SHARED_WRITES(mountpoint) 724 || ((mountpoint == NULL) 725 && MNT_SHARED_WRITES(be_lun->vn->v_mount))) 726 lock_flags = LK_SHARED; 727 else 728 lock_flags = LK_EXCLUSIVE; 729 730 vn_lock(be_lun->vn, lock_flags | LK_RETRY); 731 732 /* 733 * UFS pays attention to IO_DIRECT for writes. The write 734 * is done asynchronously. (Normally the write would just 735 * get put into cache. 736 * 737 * UFS pays attention to IO_SYNC for writes. It will 738 * attempt to write the buffer out synchronously if that 739 * flag is set. 740 * 741 * ZFS does not pay attention to IO_DIRECT for writes. 742 * 743 * ZFS pays attention to IO_SYNC (a.k.a. FSYNC or FRSYNC) 744 * for writes. It will flush the transaction from the 745 * cache before returning. 746 */ 747 error = VOP_WRITE(be_lun->vn, &xuio, flags, file_data->cred); 748 VOP_UNLOCK(be_lun->vn, 0); 749 750 vn_finished_write(mountpoint); 751 SDT_PROBE(cbb, kernel, write, file_done, 0, 0, 0, 0, 0); 752 } 753 754 mtx_lock(&be_lun->io_lock); 755 devstat_end_transaction(beio->lun->disk_stats, beio->io_len, 756 beio->ds_tag_type, beio->ds_trans_type, 757 /*now*/ NULL, /*then*/&beio->ds_t0); 758 mtx_unlock(&be_lun->io_lock); 759 760 /* 761 * If we got an error, set the sense data to "MEDIUM ERROR" and 762 * return the I/O to the user. 763 */ 764 if (error != 0) { 765 if (error == ENOSPC || error == EDQUOT) { 766 ctl_set_space_alloc_fail(&io->scsiio); 767 } else if (error == EROFS || error == EACCES) { 768 ctl_set_hw_write_protected(&io->scsiio); 769 } else { 770 ctl_set_medium_error(&io->scsiio, 771 beio->bio_cmd == BIO_READ); 772 } 773 ctl_complete_beio(beio); 774 return; 775 } 776 777 /* 778 * If this is a write or a verify, we're all done. 779 * If this is a read, we can now send the data to the user. 780 */ 781 if ((beio->bio_cmd == BIO_WRITE) || 782 (ARGS(io)->flags & CTL_LLF_VERIFY)) { 783 ctl_set_success(&io->scsiio); 784 ctl_complete_beio(beio); 785 } else { 786 if ((ARGS(io)->flags & CTL_LLF_READ) && 787 beio->beio_cont == NULL) { 788 ctl_set_success(&io->scsiio); 789 ctl_serseq_done(io); 790 } 791#ifdef CTL_TIME_IO 792 getbintime(&io->io_hdr.dma_start_bt); 793#endif 794 ctl_datamove(io); 795 } 796} 797 798static void 799ctl_be_block_gls_file(struct ctl_be_block_lun *be_lun, 800 struct ctl_be_block_io *beio) 801{ 802 union ctl_io *io = beio->io; 803 struct ctl_lba_len_flags *lbalen = ARGS(io); 804 struct scsi_get_lba_status_data *data; 805 off_t roff, off; 806 int error, status; 807 808 DPRINTF("entered\n"); 809 810 off = roff = ((off_t)lbalen->lba) * be_lun->cbe_lun.blocksize; 811 vn_lock(be_lun->vn, LK_SHARED | LK_RETRY); 812 error = VOP_IOCTL(be_lun->vn, FIOSEEKHOLE, &off, 813 0, curthread->td_ucred, curthread); 814 if (error == 0 && off > roff) 815 status = 0; /* mapped up to off */ 816 else { 817 error = VOP_IOCTL(be_lun->vn, FIOSEEKDATA, &off, 818 0, curthread->td_ucred, curthread); 819 if (error == 0 && off > roff) 820 status = 1; /* deallocated up to off */ 821 else { 822 status = 0; /* unknown up to the end */ 823 off = be_lun->size_bytes; 824 } 825 } 826 VOP_UNLOCK(be_lun->vn, 0); 827 828 data = (struct scsi_get_lba_status_data *)io->scsiio.kern_data_ptr; 829 scsi_u64to8b(lbalen->lba, data->descr[0].addr); 830 scsi_ulto4b(MIN(UINT32_MAX, off / be_lun->cbe_lun.blocksize - 831 lbalen->lba), data->descr[0].length); 832 data->descr[0].status = status; 833 834 ctl_complete_beio(beio); 835} 836 837static uint64_t 838ctl_be_block_getattr_file(struct ctl_be_block_lun *be_lun, const char *attrname) 839{ 840 struct vattr vattr; 841 struct statfs statfs; 842 uint64_t val; 843 int error; 844 845 val = UINT64_MAX; 846 if (be_lun->vn == NULL) 847 return (val); 848 vn_lock(be_lun->vn, LK_SHARED | LK_RETRY); 849 if (strcmp(attrname, "blocksused") == 0) { 850 error = VOP_GETATTR(be_lun->vn, &vattr, curthread->td_ucred); 851 if (error == 0) 852 val = vattr.va_bytes / be_lun->cbe_lun.blocksize; 853 } 854 if (strcmp(attrname, "blocksavail") == 0 && 855 (be_lun->vn->v_iflag & VI_DOOMED) == 0) { 856 error = VFS_STATFS(be_lun->vn->v_mount, &statfs); 857 if (error == 0) 858 val = statfs.f_bavail * statfs.f_bsize / 859 be_lun->cbe_lun.blocksize; 860 } 861 VOP_UNLOCK(be_lun->vn, 0); 862 return (val); 863} 864 865static void 866ctl_be_block_dispatch_zvol(struct ctl_be_block_lun *be_lun, 867 struct ctl_be_block_io *beio) 868{ 869 union ctl_io *io; 870 struct cdevsw *csw; 871 struct cdev *dev; 872 struct uio xuio; 873 struct iovec *xiovec; 874 int error, flags, i, ref; 875 876 DPRINTF("entered\n"); 877 878 io = beio->io; 879 flags = 0; 880 if (ARGS(io)->flags & CTL_LLF_DPO) 881 flags |= IO_DIRECT; 882 if (beio->bio_cmd == BIO_WRITE && ARGS(io)->flags & CTL_LLF_FUA) 883 flags |= IO_SYNC; 884 885 bzero(&xuio, sizeof(xuio)); 886 if (beio->bio_cmd == BIO_READ) { 887 SDT_PROBE(cbb, kernel, read, file_start, 0, 0, 0, 0, 0); 888 xuio.uio_rw = UIO_READ; 889 } else { 890 SDT_PROBE(cbb, kernel, write, file_start, 0, 0, 0, 0, 0); 891 xuio.uio_rw = UIO_WRITE; 892 } 893 xuio.uio_offset = beio->io_offset; 894 xuio.uio_resid = beio->io_len; 895 xuio.uio_segflg = UIO_SYSSPACE; 896 xuio.uio_iov = beio->xiovecs; 897 xuio.uio_iovcnt = beio->num_segs; 898 xuio.uio_td = curthread; 899 900 for (i = 0, xiovec = xuio.uio_iov; i < xuio.uio_iovcnt; i++, xiovec++) { 901 xiovec->iov_base = beio->sg_segs[i].addr; 902 xiovec->iov_len = beio->sg_segs[i].len; 903 } 904 905 binuptime(&beio->ds_t0); 906 mtx_lock(&be_lun->io_lock); 907 devstat_start_transaction(beio->lun->disk_stats, &beio->ds_t0); 908 mtx_unlock(&be_lun->io_lock); 909 910 csw = devvn_refthread(be_lun->vn, &dev, &ref); 911 if (csw) { 912 if (beio->bio_cmd == BIO_READ) 913 error = csw->d_read(dev, &xuio, flags); 914 else 915 error = csw->d_write(dev, &xuio, flags); 916 dev_relthread(dev, ref); 917 } else 918 error = ENXIO; 919 920 if (beio->bio_cmd == BIO_READ) 921 SDT_PROBE(cbb, kernel, read, file_done, 0, 0, 0, 0, 0); 922 else 923 SDT_PROBE(cbb, kernel, write, file_done, 0, 0, 0, 0, 0); 924 925 mtx_lock(&be_lun->io_lock); 926 devstat_end_transaction(beio->lun->disk_stats, beio->io_len, 927 beio->ds_tag_type, beio->ds_trans_type, 928 /*now*/ NULL, /*then*/&beio->ds_t0); 929 mtx_unlock(&be_lun->io_lock); 930 931 /* 932 * If we got an error, set the sense data to "MEDIUM ERROR" and 933 * return the I/O to the user. 934 */ 935 if (error != 0) { 936 if (error == ENOSPC || error == EDQUOT) { 937 ctl_set_space_alloc_fail(&io->scsiio); 938 } else if (error == EROFS || error == EACCES) { 939 ctl_set_hw_write_protected(&io->scsiio); 940 } else { 941 ctl_set_medium_error(&io->scsiio, 942 beio->bio_cmd == BIO_READ); 943 } 944 ctl_complete_beio(beio); 945 return; 946 } 947 948 /* 949 * If this is a write or a verify, we're all done. 950 * If this is a read, we can now send the data to the user. 951 */ 952 if ((beio->bio_cmd == BIO_WRITE) || 953 (ARGS(io)->flags & CTL_LLF_VERIFY)) { 954 ctl_set_success(&io->scsiio); 955 ctl_complete_beio(beio); 956 } else { 957 if ((ARGS(io)->flags & CTL_LLF_READ) && 958 beio->beio_cont == NULL) { 959 ctl_set_success(&io->scsiio); 960 ctl_serseq_done(io); 961 } 962#ifdef CTL_TIME_IO 963 getbintime(&io->io_hdr.dma_start_bt); 964#endif 965 ctl_datamove(io); 966 } 967} 968 969static void 970ctl_be_block_gls_zvol(struct ctl_be_block_lun *be_lun, 971 struct ctl_be_block_io *beio) 972{ 973 union ctl_io *io = beio->io; 974 struct cdevsw *csw; 975 struct cdev *dev; 976 struct ctl_lba_len_flags *lbalen = ARGS(io); 977 struct scsi_get_lba_status_data *data; 978 off_t roff, off; 979 int error, ref, status; 980 981 DPRINTF("entered\n"); 982 983 csw = devvn_refthread(be_lun->vn, &dev, &ref); 984 if (csw == NULL) { 985 status = 0; /* unknown up to the end */ 986 off = be_lun->size_bytes; 987 goto done; 988 } 989 off = roff = ((off_t)lbalen->lba) * be_lun->cbe_lun.blocksize; 990 error = csw->d_ioctl(dev, FIOSEEKHOLE, (caddr_t)&off, FREAD, 991 curthread); 992 if (error == 0 && off > roff) 993 status = 0; /* mapped up to off */ 994 else { 995 error = csw->d_ioctl(dev, FIOSEEKDATA, (caddr_t)&off, FREAD, 996 curthread); 997 if (error == 0 && off > roff) 998 status = 1; /* deallocated up to off */ 999 else { 1000 status = 0; /* unknown up to the end */ 1001 off = be_lun->size_bytes; 1002 } 1003 } 1004 dev_relthread(dev, ref); 1005 1006done: 1007 data = (struct scsi_get_lba_status_data *)io->scsiio.kern_data_ptr; 1008 scsi_u64to8b(lbalen->lba, data->descr[0].addr); 1009 scsi_ulto4b(MIN(UINT32_MAX, off / be_lun->cbe_lun.blocksize - 1010 lbalen->lba), data->descr[0].length); 1011 data->descr[0].status = status; 1012 1013 ctl_complete_beio(beio); 1014} 1015 1016static void 1017ctl_be_block_flush_dev(struct ctl_be_block_lun *be_lun, 1018 struct ctl_be_block_io *beio) 1019{ 1020 struct bio *bio; 1021 union ctl_io *io; 1022 struct cdevsw *csw; 1023 struct cdev *dev; 1024 int ref; 1025 1026 io = beio->io; 1027 1028 DPRINTF("entered\n"); 1029 1030 /* This can't fail, it's a blocking allocation. */ 1031 bio = g_alloc_bio(); 1032 1033 bio->bio_cmd = BIO_FLUSH; 1034 bio->bio_offset = 0; 1035 bio->bio_data = 0; 1036 bio->bio_done = ctl_be_block_biodone; 1037 bio->bio_caller1 = beio; 1038 bio->bio_pblkno = 0; 1039 1040 /* 1041 * We don't need to acquire the LUN lock here, because we are only 1042 * sending one bio, and so there is no other context to synchronize 1043 * with. 1044 */ 1045 beio->num_bios_sent = 1; 1046 beio->send_complete = 1; 1047 1048 binuptime(&beio->ds_t0); 1049 mtx_lock(&be_lun->io_lock); 1050 devstat_start_transaction(be_lun->disk_stats, &beio->ds_t0); 1051 mtx_unlock(&be_lun->io_lock); 1052 1053 csw = devvn_refthread(be_lun->vn, &dev, &ref); 1054 if (csw) { 1055 bio->bio_dev = dev; 1056 csw->d_strategy(bio); 1057 dev_relthread(dev, ref); 1058 } else { 1059 bio->bio_error = ENXIO; 1060 ctl_be_block_biodone(bio); 1061 } 1062} 1063 1064static void 1065ctl_be_block_unmap_dev_range(struct ctl_be_block_lun *be_lun, 1066 struct ctl_be_block_io *beio, 1067 uint64_t off, uint64_t len, int last) 1068{ 1069 struct bio *bio; 1070 uint64_t maxlen; 1071 struct cdevsw *csw; 1072 struct cdev *dev; 1073 int ref; 1074 1075 csw = devvn_refthread(be_lun->vn, &dev, &ref); 1076 maxlen = LONG_MAX - (LONG_MAX % be_lun->cbe_lun.blocksize); 1077 while (len > 0) { 1078 bio = g_alloc_bio(); 1079 bio->bio_cmd = BIO_DELETE; 1080 bio->bio_dev = dev; 1081 bio->bio_offset = off; 1082 bio->bio_length = MIN(len, maxlen); 1083 bio->bio_data = 0; 1084 bio->bio_done = ctl_be_block_biodone; 1085 bio->bio_caller1 = beio; 1086 bio->bio_pblkno = off / be_lun->cbe_lun.blocksize; 1087 1088 off += bio->bio_length; 1089 len -= bio->bio_length; 1090 1091 mtx_lock(&be_lun->io_lock); 1092 beio->num_bios_sent++; 1093 if (last && len == 0) 1094 beio->send_complete = 1; 1095 mtx_unlock(&be_lun->io_lock); 1096 1097 if (csw) { 1098 csw->d_strategy(bio); 1099 } else { 1100 bio->bio_error = ENXIO; 1101 ctl_be_block_biodone(bio); 1102 } 1103 } 1104 if (csw) 1105 dev_relthread(dev, ref); 1106} 1107 1108static void 1109ctl_be_block_unmap_dev(struct ctl_be_block_lun *be_lun, 1110 struct ctl_be_block_io *beio) 1111{ 1112 union ctl_io *io; 1113 struct ctl_ptr_len_flags *ptrlen; 1114 struct scsi_unmap_desc *buf, *end; 1115 uint64_t len; 1116 1117 io = beio->io; 1118 1119 DPRINTF("entered\n"); 1120 1121 binuptime(&beio->ds_t0); 1122 mtx_lock(&be_lun->io_lock); 1123 devstat_start_transaction(be_lun->disk_stats, &beio->ds_t0); 1124 mtx_unlock(&be_lun->io_lock); 1125 1126 if (beio->io_offset == -1) { 1127 beio->io_len = 0; 1128 ptrlen = (struct ctl_ptr_len_flags *)&io->io_hdr.ctl_private[CTL_PRIV_LBA_LEN]; 1129 buf = (struct scsi_unmap_desc *)ptrlen->ptr; 1130 end = buf + ptrlen->len / sizeof(*buf); 1131 for (; buf < end; buf++) { 1132 len = (uint64_t)scsi_4btoul(buf->length) * 1133 be_lun->cbe_lun.blocksize; 1134 beio->io_len += len; 1135 ctl_be_block_unmap_dev_range(be_lun, beio, 1136 scsi_8btou64(buf->lba) * be_lun->cbe_lun.blocksize, 1137 len, (end - buf < 2) ? TRUE : FALSE); 1138 } 1139 } else 1140 ctl_be_block_unmap_dev_range(be_lun, beio, 1141 beio->io_offset, beio->io_len, TRUE); 1142} 1143 1144static void 1145ctl_be_block_dispatch_dev(struct ctl_be_block_lun *be_lun, 1146 struct ctl_be_block_io *beio) 1147{ 1148 TAILQ_HEAD(, bio) queue = TAILQ_HEAD_INITIALIZER(queue); 1149 struct bio *bio; 1150 struct cdevsw *csw; 1151 struct cdev *dev; 1152 off_t cur_offset; 1153 int i, max_iosize, ref; 1154 1155 DPRINTF("entered\n"); 1156 csw = devvn_refthread(be_lun->vn, &dev, &ref); 1157 1158 /* 1159 * We have to limit our I/O size to the maximum supported by the 1160 * backend device. Hopefully it is MAXPHYS. If the driver doesn't 1161 * set it properly, use DFLTPHYS. 1162 */ 1163 if (csw) { 1164 max_iosize = dev->si_iosize_max; 1165 if (max_iosize < PAGE_SIZE) 1166 max_iosize = DFLTPHYS; 1167 } else 1168 max_iosize = DFLTPHYS; 1169 1170 cur_offset = beio->io_offset; 1171 for (i = 0; i < beio->num_segs; i++) { 1172 size_t cur_size; 1173 uint8_t *cur_ptr; 1174 1175 cur_size = beio->sg_segs[i].len; 1176 cur_ptr = beio->sg_segs[i].addr; 1177 1178 while (cur_size > 0) { 1179 /* This can't fail, it's a blocking allocation. */ 1180 bio = g_alloc_bio(); 1181 1182 KASSERT(bio != NULL, ("g_alloc_bio() failed!\n")); 1183 1184 bio->bio_cmd = beio->bio_cmd; 1185 bio->bio_dev = dev; 1186 bio->bio_caller1 = beio; 1187 bio->bio_length = min(cur_size, max_iosize); 1188 bio->bio_offset = cur_offset; 1189 bio->bio_data = cur_ptr; 1190 bio->bio_done = ctl_be_block_biodone; 1191 bio->bio_pblkno = cur_offset / be_lun->cbe_lun.blocksize; 1192 1193 cur_offset += bio->bio_length; 1194 cur_ptr += bio->bio_length; 1195 cur_size -= bio->bio_length; 1196 1197 TAILQ_INSERT_TAIL(&queue, bio, bio_queue); 1198 beio->num_bios_sent++; 1199 } 1200 } 1201 binuptime(&beio->ds_t0); 1202 mtx_lock(&be_lun->io_lock); 1203 devstat_start_transaction(be_lun->disk_stats, &beio->ds_t0); 1204 beio->send_complete = 1; 1205 mtx_unlock(&be_lun->io_lock); 1206 1207 /* 1208 * Fire off all allocated requests! 1209 */ 1210 while ((bio = TAILQ_FIRST(&queue)) != NULL) { 1211 TAILQ_REMOVE(&queue, bio, bio_queue); 1212 if (csw) 1213 csw->d_strategy(bio); 1214 else { 1215 bio->bio_error = ENXIO; 1216 ctl_be_block_biodone(bio); 1217 } 1218 } 1219 if (csw) 1220 dev_relthread(dev, ref); 1221} 1222 1223static uint64_t 1224ctl_be_block_getattr_dev(struct ctl_be_block_lun *be_lun, const char *attrname) 1225{ 1226 struct diocgattr_arg arg; 1227 struct cdevsw *csw; 1228 struct cdev *dev; 1229 int error, ref; 1230 1231 csw = devvn_refthread(be_lun->vn, &dev, &ref); 1232 if (csw == NULL) 1233 return (UINT64_MAX); 1234 strlcpy(arg.name, attrname, sizeof(arg.name)); 1235 arg.len = sizeof(arg.value.off); 1236 if (csw->d_ioctl) { 1237 error = csw->d_ioctl(dev, DIOCGATTR, (caddr_t)&arg, FREAD, 1238 curthread); 1239 } else 1240 error = ENODEV; 1241 dev_relthread(dev, ref); 1242 if (error != 0) 1243 return (UINT64_MAX); 1244 return (arg.value.off); 1245} 1246 1247static void 1248ctl_be_block_cw_dispatch_sync(struct ctl_be_block_lun *be_lun, 1249 union ctl_io *io) 1250{ 1251 struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun; 1252 struct ctl_be_block_io *beio; 1253 struct ctl_lba_len_flags *lbalen; 1254 1255 DPRINTF("entered\n"); 1256 beio = (struct ctl_be_block_io *)PRIV(io)->ptr; 1257 lbalen = (struct ctl_lba_len_flags *)&io->io_hdr.ctl_private[CTL_PRIV_LBA_LEN]; 1258 1259 beio->io_len = lbalen->len * cbe_lun->blocksize; 1260 beio->io_offset = lbalen->lba * cbe_lun->blocksize; 1261 beio->io_arg = (lbalen->flags & SSC_IMMED) != 0; 1262 beio->bio_cmd = BIO_FLUSH; 1263 beio->ds_trans_type = DEVSTAT_NO_DATA; 1264 DPRINTF("SYNC\n"); 1265 be_lun->lun_flush(be_lun, beio); 1266} 1267 1268static void 1269ctl_be_block_cw_done_ws(struct ctl_be_block_io *beio) 1270{ 1271 union ctl_io *io; 1272 1273 io = beio->io; 1274 ctl_free_beio(beio); 1275 if ((io->io_hdr.flags & CTL_FLAG_ABORT) || 1276 ((io->io_hdr.status & CTL_STATUS_MASK) != CTL_STATUS_NONE && 1277 (io->io_hdr.status & CTL_STATUS_MASK) != CTL_SUCCESS)) { 1278 ctl_config_write_done(io); 1279 return; 1280 } 1281 1282 ctl_be_block_config_write(io); 1283} 1284 1285static void 1286ctl_be_block_cw_dispatch_ws(struct ctl_be_block_lun *be_lun, 1287 union ctl_io *io) 1288{ 1289 struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun; 1290 struct ctl_be_block_io *beio; 1291 struct ctl_lba_len_flags *lbalen; 1292 uint64_t len_left, lba; 1293 uint32_t pb, pbo, adj; 1294 int i, seglen; 1295 uint8_t *buf, *end; 1296 1297 DPRINTF("entered\n"); 1298 1299 beio = (struct ctl_be_block_io *)PRIV(io)->ptr; 1300 lbalen = ARGS(beio->io); 1301 1302 if (lbalen->flags & ~(SWS_LBDATA | SWS_UNMAP | SWS_ANCHOR | SWS_NDOB) || 1303 (lbalen->flags & (SWS_UNMAP | SWS_ANCHOR) && be_lun->unmap == NULL)) { 1304 ctl_free_beio(beio); 1305 ctl_set_invalid_field(&io->scsiio, 1306 /*sks_valid*/ 1, 1307 /*command*/ 1, 1308 /*field*/ 1, 1309 /*bit_valid*/ 0, 1310 /*bit*/ 0); 1311 ctl_config_write_done(io); 1312 return; 1313 } 1314 1315 if (lbalen->flags & (SWS_UNMAP | SWS_ANCHOR)) { 1316 beio->io_offset = lbalen->lba * cbe_lun->blocksize; 1317 beio->io_len = (uint64_t)lbalen->len * cbe_lun->blocksize; 1318 beio->bio_cmd = BIO_DELETE; 1319 beio->ds_trans_type = DEVSTAT_FREE; 1320 1321 be_lun->unmap(be_lun, beio); 1322 return; 1323 } 1324 1325 beio->bio_cmd = BIO_WRITE; 1326 beio->ds_trans_type = DEVSTAT_WRITE; 1327 1328 DPRINTF("WRITE SAME at LBA %jx len %u\n", 1329 (uintmax_t)lbalen->lba, lbalen->len); 1330 1331 pb = cbe_lun->blocksize << be_lun->cbe_lun.pblockexp; 1332 if (be_lun->cbe_lun.pblockoff > 0) 1333 pbo = pb - cbe_lun->blocksize * be_lun->cbe_lun.pblockoff; 1334 else 1335 pbo = 0; 1336 len_left = (uint64_t)lbalen->len * cbe_lun->blocksize; 1337 for (i = 0, lba = 0; i < CTLBLK_MAX_SEGS && len_left > 0; i++) { 1338 1339 /* 1340 * Setup the S/G entry for this chunk. 1341 */ 1342 seglen = MIN(CTLBLK_MAX_SEG, len_left); 1343 if (pb > cbe_lun->blocksize) { 1344 adj = ((lbalen->lba + lba) * cbe_lun->blocksize + 1345 seglen - pbo) % pb; 1346 if (seglen > adj) 1347 seglen -= adj; 1348 else 1349 seglen -= seglen % cbe_lun->blocksize; 1350 } else 1351 seglen -= seglen % cbe_lun->blocksize; 1352 beio->sg_segs[i].len = seglen; 1353 beio->sg_segs[i].addr = uma_zalloc(be_lun->lun_zone, M_WAITOK); 1354 1355 DPRINTF("segment %d addr %p len %zd\n", i, 1356 beio->sg_segs[i].addr, beio->sg_segs[i].len); 1357 1358 beio->num_segs++; 1359 len_left -= seglen; 1360 1361 buf = beio->sg_segs[i].addr; 1362 end = buf + seglen; 1363 for (; buf < end; buf += cbe_lun->blocksize) { 1364 memcpy(buf, io->scsiio.kern_data_ptr, cbe_lun->blocksize); 1365 if (lbalen->flags & SWS_LBDATA) 1366 scsi_ulto4b(lbalen->lba + lba, buf); 1367 lba++; 1368 } 1369 } 1370 1371 beio->io_offset = lbalen->lba * cbe_lun->blocksize; 1372 beio->io_len = lba * cbe_lun->blocksize; 1373 1374 /* We can not do all in one run. Correct and schedule rerun. */ 1375 if (len_left > 0) { 1376 lbalen->lba += lba; 1377 lbalen->len -= lba; 1378 beio->beio_cont = ctl_be_block_cw_done_ws; 1379 } 1380 1381 be_lun->dispatch(be_lun, beio); 1382} 1383 1384static void 1385ctl_be_block_cw_dispatch_unmap(struct ctl_be_block_lun *be_lun, 1386 union ctl_io *io) 1387{ 1388 struct ctl_be_block_io *beio; 1389 struct ctl_ptr_len_flags *ptrlen; 1390 1391 DPRINTF("entered\n"); 1392 1393 beio = (struct ctl_be_block_io *)PRIV(io)->ptr; 1394 ptrlen = (struct ctl_ptr_len_flags *)&io->io_hdr.ctl_private[CTL_PRIV_LBA_LEN]; 1395 1396 if ((ptrlen->flags & ~SU_ANCHOR) != 0 || be_lun->unmap == NULL) { 1397 ctl_free_beio(beio); 1398 ctl_set_invalid_field(&io->scsiio, 1399 /*sks_valid*/ 0, 1400 /*command*/ 1, 1401 /*field*/ 0, 1402 /*bit_valid*/ 0, 1403 /*bit*/ 0); 1404 ctl_config_write_done(io); 1405 return; 1406 } 1407 1408 beio->io_len = 0; 1409 beio->io_offset = -1; 1410 beio->bio_cmd = BIO_DELETE; 1411 beio->ds_trans_type = DEVSTAT_FREE; 1412 DPRINTF("UNMAP\n"); 1413 be_lun->unmap(be_lun, beio); 1414} 1415 1416static void 1417ctl_be_block_cr_done(struct ctl_be_block_io *beio) 1418{ 1419 union ctl_io *io; 1420 1421 io = beio->io; 1422 ctl_free_beio(beio); 1423 ctl_config_read_done(io); 1424} 1425 1426static void 1427ctl_be_block_cr_dispatch(struct ctl_be_block_lun *be_lun, 1428 union ctl_io *io) 1429{ 1430 struct ctl_be_block_io *beio; 1431 struct ctl_be_block_softc *softc; 1432 1433 DPRINTF("entered\n"); 1434 1435 softc = be_lun->softc; 1436 beio = ctl_alloc_beio(softc); 1437 beio->io = io; 1438 beio->lun = be_lun; 1439 beio->beio_cont = ctl_be_block_cr_done; 1440 PRIV(io)->ptr = (void *)beio; 1441 1442 switch (io->scsiio.cdb[0]) { 1443 case SERVICE_ACTION_IN: /* GET LBA STATUS */ 1444 beio->bio_cmd = -1; 1445 beio->ds_trans_type = DEVSTAT_NO_DATA; 1446 beio->ds_tag_type = DEVSTAT_TAG_ORDERED; 1447 beio->io_len = 0; 1448 if (be_lun->get_lba_status) 1449 be_lun->get_lba_status(be_lun, beio); 1450 else 1451 ctl_be_block_cr_done(beio); 1452 break; 1453 default: 1454 panic("Unhandled CDB type %#x", io->scsiio.cdb[0]); 1455 break; 1456 } 1457} 1458 1459static void 1460ctl_be_block_cw_done(struct ctl_be_block_io *beio) 1461{ 1462 union ctl_io *io; 1463 1464 io = beio->io; 1465 ctl_free_beio(beio); 1466 ctl_config_write_done(io); 1467} 1468 1469static void 1470ctl_be_block_cw_dispatch(struct ctl_be_block_lun *be_lun, 1471 union ctl_io *io) 1472{ 1473 struct ctl_be_block_io *beio; 1474 struct ctl_be_block_softc *softc; 1475 1476 DPRINTF("entered\n"); 1477 1478 softc = be_lun->softc; 1479 beio = ctl_alloc_beio(softc); 1480 beio->io = io; 1481 beio->lun = be_lun; 1482 beio->beio_cont = ctl_be_block_cw_done; 1483 switch (io->scsiio.tag_type) { 1484 case CTL_TAG_ORDERED: 1485 beio->ds_tag_type = DEVSTAT_TAG_ORDERED; 1486 break; 1487 case CTL_TAG_HEAD_OF_QUEUE: 1488 beio->ds_tag_type = DEVSTAT_TAG_HEAD; 1489 break; 1490 case CTL_TAG_UNTAGGED: 1491 case CTL_TAG_SIMPLE: 1492 case CTL_TAG_ACA: 1493 default: 1494 beio->ds_tag_type = DEVSTAT_TAG_SIMPLE; 1495 break; 1496 } 1497 PRIV(io)->ptr = (void *)beio; 1498 1499 switch (io->scsiio.cdb[0]) { 1500 case SYNCHRONIZE_CACHE: 1501 case SYNCHRONIZE_CACHE_16: 1502 ctl_be_block_cw_dispatch_sync(be_lun, io); 1503 break; 1504 case WRITE_SAME_10: 1505 case WRITE_SAME_16: 1506 ctl_be_block_cw_dispatch_ws(be_lun, io); 1507 break; 1508 case UNMAP: 1509 ctl_be_block_cw_dispatch_unmap(be_lun, io); 1510 break; 1511 default: 1512 panic("Unhandled CDB type %#x", io->scsiio.cdb[0]); 1513 break; 1514 } 1515} 1516 1517SDT_PROBE_DEFINE1(cbb, kernel, read, start, "uint64_t"); 1518SDT_PROBE_DEFINE1(cbb, kernel, write, start, "uint64_t"); 1519SDT_PROBE_DEFINE1(cbb, kernel, read, alloc_done, "uint64_t"); 1520SDT_PROBE_DEFINE1(cbb, kernel, write, alloc_done, "uint64_t"); 1521 1522static void 1523ctl_be_block_next(struct ctl_be_block_io *beio) 1524{ 1525 struct ctl_be_block_lun *be_lun; 1526 union ctl_io *io; 1527 1528 io = beio->io; 1529 be_lun = beio->lun; 1530 ctl_free_beio(beio); 1531 if ((io->io_hdr.flags & CTL_FLAG_ABORT) || 1532 ((io->io_hdr.status & CTL_STATUS_MASK) != CTL_STATUS_NONE && 1533 (io->io_hdr.status & CTL_STATUS_MASK) != CTL_SUCCESS)) { 1534 ctl_data_submit_done(io); 1535 return; 1536 } 1537 1538 io->io_hdr.status &= ~CTL_STATUS_MASK; 1539 io->io_hdr.status |= CTL_STATUS_NONE; 1540 1541 mtx_lock(&be_lun->queue_lock); 1542 /* 1543 * XXX KDM make sure that links is okay to use at this point. 1544 * Otherwise, we either need to add another field to ctl_io_hdr, 1545 * or deal with resource allocation here. 1546 */ 1547 STAILQ_INSERT_TAIL(&be_lun->input_queue, &io->io_hdr, links); 1548 mtx_unlock(&be_lun->queue_lock); 1549 1550 taskqueue_enqueue(be_lun->io_taskqueue, &be_lun->io_task); 1551} 1552 1553static void 1554ctl_be_block_dispatch(struct ctl_be_block_lun *be_lun, 1555 union ctl_io *io) 1556{ 1557 struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun; 1558 struct ctl_be_block_io *beio; 1559 struct ctl_be_block_softc *softc; 1560 struct ctl_lba_len_flags *lbalen; 1561 struct ctl_ptr_len_flags *bptrlen; 1562 uint64_t len_left, lbas; 1563 int i; 1564 1565 softc = be_lun->softc; 1566 1567 DPRINTF("entered\n"); 1568 1569 lbalen = ARGS(io); 1570 if (lbalen->flags & CTL_LLF_WRITE) { 1571 SDT_PROBE(cbb, kernel, write, start, 0, 0, 0, 0, 0); 1572 } else { 1573 SDT_PROBE(cbb, kernel, read, start, 0, 0, 0, 0, 0); 1574 } 1575 1576 beio = ctl_alloc_beio(softc); 1577 beio->io = io; 1578 beio->lun = be_lun; 1579 bptrlen = PRIV(io); 1580 bptrlen->ptr = (void *)beio; 1581 1582 switch (io->scsiio.tag_type) { 1583 case CTL_TAG_ORDERED: 1584 beio->ds_tag_type = DEVSTAT_TAG_ORDERED; 1585 break; 1586 case CTL_TAG_HEAD_OF_QUEUE: 1587 beio->ds_tag_type = DEVSTAT_TAG_HEAD; 1588 break; 1589 case CTL_TAG_UNTAGGED: 1590 case CTL_TAG_SIMPLE: 1591 case CTL_TAG_ACA: 1592 default: 1593 beio->ds_tag_type = DEVSTAT_TAG_SIMPLE; 1594 break; 1595 } 1596 1597 if (lbalen->flags & CTL_LLF_WRITE) { 1598 beio->bio_cmd = BIO_WRITE; 1599 beio->ds_trans_type = DEVSTAT_WRITE; 1600 } else { 1601 beio->bio_cmd = BIO_READ; 1602 beio->ds_trans_type = DEVSTAT_READ; 1603 } 1604 1605 DPRINTF("%s at LBA %jx len %u @%ju\n", 1606 (beio->bio_cmd == BIO_READ) ? "READ" : "WRITE", 1607 (uintmax_t)lbalen->lba, lbalen->len, bptrlen->len); 1608 if (lbalen->flags & CTL_LLF_COMPARE) 1609 lbas = CTLBLK_HALF_IO_SIZE; 1610 else 1611 lbas = CTLBLK_MAX_IO_SIZE; 1612 lbas = MIN(lbalen->len - bptrlen->len, lbas / cbe_lun->blocksize); 1613 beio->io_offset = (lbalen->lba + bptrlen->len) * cbe_lun->blocksize; 1614 beio->io_len = lbas * cbe_lun->blocksize; 1615 bptrlen->len += lbas; 1616 1617 for (i = 0, len_left = beio->io_len; len_left > 0; i++) { 1618 KASSERT(i < CTLBLK_MAX_SEGS, ("Too many segs (%d >= %d)", 1619 i, CTLBLK_MAX_SEGS)); 1620 1621 /* 1622 * Setup the S/G entry for this chunk. 1623 */ 1624 beio->sg_segs[i].len = min(CTLBLK_MAX_SEG, len_left); 1625 beio->sg_segs[i].addr = uma_zalloc(be_lun->lun_zone, M_WAITOK); 1626 1627 DPRINTF("segment %d addr %p len %zd\n", i, 1628 beio->sg_segs[i].addr, beio->sg_segs[i].len); 1629 1630 /* Set up second segment for compare operation. */ 1631 if (lbalen->flags & CTL_LLF_COMPARE) { 1632 beio->sg_segs[i + CTLBLK_HALF_SEGS].len = 1633 beio->sg_segs[i].len; 1634 beio->sg_segs[i + CTLBLK_HALF_SEGS].addr = 1635 uma_zalloc(be_lun->lun_zone, M_WAITOK); 1636 } 1637 1638 beio->num_segs++; 1639 len_left -= beio->sg_segs[i].len; 1640 } 1641 if (bptrlen->len < lbalen->len) 1642 beio->beio_cont = ctl_be_block_next; 1643 io->scsiio.be_move_done = ctl_be_block_move_done; 1644 /* For compare we have separate S/G lists for read and datamove. */ 1645 if (lbalen->flags & CTL_LLF_COMPARE) 1646 io->scsiio.kern_data_ptr = (uint8_t *)&beio->sg_segs[CTLBLK_HALF_SEGS]; 1647 else 1648 io->scsiio.kern_data_ptr = (uint8_t *)beio->sg_segs; 1649 io->scsiio.kern_data_len = beio->io_len; 1650 io->scsiio.kern_data_resid = 0; 1651 io->scsiio.kern_sg_entries = beio->num_segs; 1652 io->io_hdr.flags |= CTL_FLAG_ALLOCATED | CTL_FLAG_KDPTR_SGLIST; 1653 1654 /* 1655 * For the read case, we need to read the data into our buffers and 1656 * then we can send it back to the user. For the write case, we 1657 * need to get the data from the user first. 1658 */ 1659 if (beio->bio_cmd == BIO_READ) { 1660 SDT_PROBE(cbb, kernel, read, alloc_done, 0, 0, 0, 0, 0); 1661 be_lun->dispatch(be_lun, beio); 1662 } else { 1663 SDT_PROBE(cbb, kernel, write, alloc_done, 0, 0, 0, 0, 0); 1664#ifdef CTL_TIME_IO 1665 getbintime(&io->io_hdr.dma_start_bt); 1666#endif 1667 ctl_datamove(io); 1668 } 1669} 1670 1671static void 1672ctl_be_block_worker(void *context, int pending) 1673{ 1674 struct ctl_be_block_lun *be_lun = (struct ctl_be_block_lun *)context; 1675 struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun; 1676 union ctl_io *io; 1677 struct ctl_be_block_io *beio; 1678 1679 DPRINTF("entered\n"); 1680 /* 1681 * Fetch and process I/Os from all queues. If we detect LUN 1682 * CTL_LUN_FLAG_OFFLINE status here -- it is result of a race, 1683 * so make response maximally opaque to not confuse initiator. 1684 */ 1685 for (;;) { 1686 mtx_lock(&be_lun->queue_lock); 1687 io = (union ctl_io *)STAILQ_FIRST(&be_lun->datamove_queue); 1688 if (io != NULL) { 1689 DPRINTF("datamove queue\n"); 1690 STAILQ_REMOVE(&be_lun->datamove_queue, &io->io_hdr, 1691 ctl_io_hdr, links); 1692 mtx_unlock(&be_lun->queue_lock); 1693 beio = (struct ctl_be_block_io *)PRIV(io)->ptr; 1694 if (cbe_lun->flags & CTL_LUN_FLAG_OFFLINE) { 1695 ctl_set_busy(&io->scsiio); 1696 ctl_complete_beio(beio); 1697 return; 1698 } 1699 be_lun->dispatch(be_lun, beio); 1700 continue; 1701 } 1702 io = (union ctl_io *)STAILQ_FIRST(&be_lun->config_write_queue); 1703 if (io != NULL) { 1704 DPRINTF("config write queue\n"); 1705 STAILQ_REMOVE(&be_lun->config_write_queue, &io->io_hdr, 1706 ctl_io_hdr, links); 1707 mtx_unlock(&be_lun->queue_lock); 1708 if (cbe_lun->flags & CTL_LUN_FLAG_OFFLINE) { 1709 ctl_set_busy(&io->scsiio); 1710 ctl_config_write_done(io); 1711 return; 1712 } 1713 ctl_be_block_cw_dispatch(be_lun, io); 1714 continue; 1715 } 1716 io = (union ctl_io *)STAILQ_FIRST(&be_lun->config_read_queue); 1717 if (io != NULL) { 1718 DPRINTF("config read queue\n"); 1719 STAILQ_REMOVE(&be_lun->config_read_queue, &io->io_hdr, 1720 ctl_io_hdr, links); 1721 mtx_unlock(&be_lun->queue_lock); 1722 if (cbe_lun->flags & CTL_LUN_FLAG_OFFLINE) { 1723 ctl_set_busy(&io->scsiio); 1724 ctl_config_read_done(io); 1725 return; 1726 } 1727 ctl_be_block_cr_dispatch(be_lun, io); 1728 continue; 1729 } 1730 io = (union ctl_io *)STAILQ_FIRST(&be_lun->input_queue); 1731 if (io != NULL) { 1732 DPRINTF("input queue\n"); 1733 STAILQ_REMOVE(&be_lun->input_queue, &io->io_hdr, 1734 ctl_io_hdr, links); 1735 mtx_unlock(&be_lun->queue_lock); 1736 if (cbe_lun->flags & CTL_LUN_FLAG_OFFLINE) { 1737 ctl_set_busy(&io->scsiio); 1738 ctl_data_submit_done(io); 1739 return; 1740 } 1741 ctl_be_block_dispatch(be_lun, io); 1742 continue; 1743 } 1744 1745 /* 1746 * If we get here, there is no work left in the queues, so 1747 * just break out and let the task queue go to sleep. 1748 */ 1749 mtx_unlock(&be_lun->queue_lock); 1750 break; 1751 } 1752} 1753 1754/* 1755 * Entry point from CTL to the backend for I/O. We queue everything to a 1756 * work thread, so this just puts the I/O on a queue and wakes up the 1757 * thread. 1758 */ 1759static int 1760ctl_be_block_submit(union ctl_io *io) 1761{ 1762 struct ctl_be_block_lun *be_lun; 1763 struct ctl_be_lun *cbe_lun; 1764 1765 DPRINTF("entered\n"); 1766 1767 cbe_lun = (struct ctl_be_lun *)io->io_hdr.ctl_private[ 1768 CTL_PRIV_BACKEND_LUN].ptr; 1769 be_lun = (struct ctl_be_block_lun *)cbe_lun->be_lun; 1770 1771 /* 1772 * Make sure we only get SCSI I/O. 1773 */ 1774 KASSERT(io->io_hdr.io_type == CTL_IO_SCSI, ("Non-SCSI I/O (type " 1775 "%#x) encountered", io->io_hdr.io_type)); 1776 1777 PRIV(io)->len = 0; 1778 1779 mtx_lock(&be_lun->queue_lock); 1780 /* 1781 * XXX KDM make sure that links is okay to use at this point. 1782 * Otherwise, we either need to add another field to ctl_io_hdr, 1783 * or deal with resource allocation here. 1784 */ 1785 STAILQ_INSERT_TAIL(&be_lun->input_queue, &io->io_hdr, links); 1786 mtx_unlock(&be_lun->queue_lock); 1787 taskqueue_enqueue(be_lun->io_taskqueue, &be_lun->io_task); 1788 1789 return (CTL_RETVAL_COMPLETE); 1790} 1791 1792static int 1793ctl_be_block_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, 1794 int flag, struct thread *td) 1795{ 1796 struct ctl_be_block_softc *softc; 1797 int error; 1798 1799 softc = &backend_block_softc; 1800 1801 error = 0; 1802 1803 switch (cmd) { 1804 case CTL_LUN_REQ: { 1805 struct ctl_lun_req *lun_req; 1806 1807 lun_req = (struct ctl_lun_req *)addr; 1808 1809 switch (lun_req->reqtype) { 1810 case CTL_LUNREQ_CREATE: 1811 error = ctl_be_block_create(softc, lun_req); 1812 break; 1813 case CTL_LUNREQ_RM: 1814 error = ctl_be_block_rm(softc, lun_req); 1815 break; 1816 case CTL_LUNREQ_MODIFY: 1817 error = ctl_be_block_modify(softc, lun_req); 1818 break; 1819 default: 1820 lun_req->status = CTL_LUN_ERROR; 1821 snprintf(lun_req->error_str, sizeof(lun_req->error_str), 1822 "invalid LUN request type %d", 1823 lun_req->reqtype); 1824 break; 1825 } 1826 break; 1827 } 1828 default: 1829 error = ENOTTY; 1830 break; 1831 } 1832 1833 return (error); 1834} 1835 1836static int 1837ctl_be_block_open_file(struct ctl_be_block_lun *be_lun, struct ctl_lun_req *req) 1838{ 1839 struct ctl_be_lun *cbe_lun; 1840 struct ctl_be_block_filedata *file_data; 1841 struct ctl_lun_create_params *params; 1842 char *value; 1843 struct vattr vattr; 1844 off_t ps, pss, po, pos, us, uss, uo, uos; 1845 int error; 1846 1847 error = 0; 1848 cbe_lun = &be_lun->cbe_lun; 1849 file_data = &be_lun->backend.file; 1850 params = &be_lun->params; 1851 1852 be_lun->dev_type = CTL_BE_BLOCK_FILE; 1853 be_lun->dispatch = ctl_be_block_dispatch_file; 1854 be_lun->lun_flush = ctl_be_block_flush_file; 1855 be_lun->get_lba_status = ctl_be_block_gls_file; 1856 be_lun->getattr = ctl_be_block_getattr_file; 1857 be_lun->unmap = NULL; 1858 cbe_lun->flags &= ~CTL_LUN_FLAG_UNMAP; 1859 1860 error = VOP_GETATTR(be_lun->vn, &vattr, curthread->td_ucred); 1861 if (error != 0) { 1862 snprintf(req->error_str, sizeof(req->error_str), 1863 "error calling VOP_GETATTR() for file %s", 1864 be_lun->dev_path); 1865 return (error); 1866 } 1867 1868 /* 1869 * Verify that we have the ability to upgrade to exclusive 1870 * access on this file so we can trap errors at open instead 1871 * of reporting them during first access. 1872 */ 1873 if (VOP_ISLOCKED(be_lun->vn) != LK_EXCLUSIVE) { 1874 vn_lock(be_lun->vn, LK_UPGRADE | LK_RETRY); 1875 if (be_lun->vn->v_iflag & VI_DOOMED) { 1876 error = EBADF; 1877 snprintf(req->error_str, sizeof(req->error_str), 1878 "error locking file %s", be_lun->dev_path); 1879 return (error); 1880 } 1881 } 1882 1883 file_data->cred = crhold(curthread->td_ucred); 1884 if (params->lun_size_bytes != 0) 1885 be_lun->size_bytes = params->lun_size_bytes; 1886 else 1887 be_lun->size_bytes = vattr.va_size; 1888 1889 /* 1890 * For files we can use any logical block size. Prefer 512 bytes 1891 * for compatibility reasons. If file's vattr.va_blocksize 1892 * (preferred I/O block size) is bigger and multiple to chosen 1893 * logical block size -- report it as physical block size. 1894 */ 1895 if (params->blocksize_bytes != 0) 1896 cbe_lun->blocksize = params->blocksize_bytes; 1897 else 1898 cbe_lun->blocksize = 512; 1899 be_lun->size_blocks = be_lun->size_bytes / cbe_lun->blocksize; 1900 cbe_lun->maxlba = (be_lun->size_blocks == 0) ? 1901 0 : (be_lun->size_blocks - 1); 1902 1903 us = ps = vattr.va_blocksize; 1904 uo = po = 0; 1905 1906 value = ctl_get_opt(&cbe_lun->options, "pblocksize"); 1907 if (value != NULL) 1908 ctl_expand_number(value, &ps); 1909 value = ctl_get_opt(&cbe_lun->options, "pblockoffset"); 1910 if (value != NULL) 1911 ctl_expand_number(value, &po); 1912 pss = ps / cbe_lun->blocksize; 1913 pos = po / cbe_lun->blocksize; 1914 if ((pss > 0) && (pss * cbe_lun->blocksize == ps) && (pss >= pos) && 1915 ((pss & (pss - 1)) == 0) && (pos * cbe_lun->blocksize == po)) { 1916 cbe_lun->pblockexp = fls(pss) - 1; 1917 cbe_lun->pblockoff = (pss - pos) % pss; 1918 } 1919 1920 value = ctl_get_opt(&cbe_lun->options, "ublocksize"); 1921 if (value != NULL) 1922 ctl_expand_number(value, &us); 1923 value = ctl_get_opt(&cbe_lun->options, "ublockoffset"); 1924 if (value != NULL) 1925 ctl_expand_number(value, &uo); 1926 uss = us / cbe_lun->blocksize; 1927 uos = uo / cbe_lun->blocksize; 1928 if ((uss > 0) && (uss * cbe_lun->blocksize == us) && (uss >= uos) && 1929 ((uss & (uss - 1)) == 0) && (uos * cbe_lun->blocksize == uo)) { 1930 cbe_lun->ublockexp = fls(uss) - 1; 1931 cbe_lun->ublockoff = (uss - uos) % uss; 1932 } 1933 1934 /* 1935 * Sanity check. The media size has to be at least one 1936 * sector long. 1937 */ 1938 if (be_lun->size_bytes < cbe_lun->blocksize) { 1939 error = EINVAL; 1940 snprintf(req->error_str, sizeof(req->error_str), 1941 "file %s size %ju < block size %u", be_lun->dev_path, 1942 (uintmax_t)be_lun->size_bytes, cbe_lun->blocksize); 1943 } 1944 1945 cbe_lun->opttxferlen = CTLBLK_MAX_IO_SIZE / cbe_lun->blocksize; 1946 return (error); 1947} 1948 1949static int 1950ctl_be_block_open_dev(struct ctl_be_block_lun *be_lun, struct ctl_lun_req *req) 1951{ 1952 struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun; 1953 struct ctl_lun_create_params *params; 1954 struct cdevsw *csw; 1955 struct cdev *dev; 1956 char *value; 1957 int error, atomic, maxio, ref, unmap, tmp; 1958 off_t ps, pss, po, pos, us, uss, uo, uos, otmp; 1959 1960 params = &be_lun->params; 1961 1962 be_lun->dev_type = CTL_BE_BLOCK_DEV; 1963 csw = devvn_refthread(be_lun->vn, &dev, &ref); 1964 if (csw == NULL) 1965 return (ENXIO); 1966 if (strcmp(csw->d_name, "zvol") == 0) { 1967 be_lun->dispatch = ctl_be_block_dispatch_zvol; 1968 be_lun->get_lba_status = ctl_be_block_gls_zvol; 1969 atomic = maxio = CTLBLK_MAX_IO_SIZE; 1970 } else { 1971 be_lun->dispatch = ctl_be_block_dispatch_dev; 1972 be_lun->get_lba_status = NULL; 1973 atomic = 0; 1974 maxio = dev->si_iosize_max; 1975 if (maxio <= 0) 1976 maxio = DFLTPHYS; 1977 if (maxio > CTLBLK_MAX_IO_SIZE) 1978 maxio = CTLBLK_MAX_IO_SIZE; 1979 } 1980 be_lun->lun_flush = ctl_be_block_flush_dev; 1981 be_lun->getattr = ctl_be_block_getattr_dev; 1982 be_lun->unmap = ctl_be_block_unmap_dev; 1983 1984 if (!csw->d_ioctl) { 1985 dev_relthread(dev, ref); 1986 snprintf(req->error_str, sizeof(req->error_str), 1987 "no d_ioctl for device %s!", be_lun->dev_path); 1988 return (ENODEV); 1989 } 1990 1991 error = csw->d_ioctl(dev, DIOCGSECTORSIZE, (caddr_t)&tmp, FREAD, 1992 curthread); 1993 if (error) { 1994 dev_relthread(dev, ref); 1995 snprintf(req->error_str, sizeof(req->error_str), 1996 "error %d returned for DIOCGSECTORSIZE ioctl " 1997 "on %s!", error, be_lun->dev_path); 1998 return (error); 1999 } 2000 2001 /* 2002 * If the user has asked for a blocksize that is greater than the 2003 * backing device's blocksize, we can do it only if the blocksize 2004 * the user is asking for is an even multiple of the underlying 2005 * device's blocksize. 2006 */ 2007 if ((params->blocksize_bytes != 0) && 2008 (params->blocksize_bytes >= tmp)) { 2009 if (params->blocksize_bytes % tmp == 0) { 2010 cbe_lun->blocksize = params->blocksize_bytes; 2011 } else { 2012 dev_relthread(dev, ref); 2013 snprintf(req->error_str, sizeof(req->error_str), 2014 "requested blocksize %u is not an even " 2015 "multiple of backing device blocksize %u", 2016 params->blocksize_bytes, tmp); 2017 return (EINVAL); 2018 } 2019 } else if (params->blocksize_bytes != 0) { 2020 dev_relthread(dev, ref); 2021 snprintf(req->error_str, sizeof(req->error_str), 2022 "requested blocksize %u < backing device " 2023 "blocksize %u", params->blocksize_bytes, tmp); 2024 return (EINVAL); 2025 } else 2026 cbe_lun->blocksize = tmp; 2027 2028 error = csw->d_ioctl(dev, DIOCGMEDIASIZE, (caddr_t)&otmp, FREAD, 2029 curthread); 2030 if (error) { 2031 dev_relthread(dev, ref); 2032 snprintf(req->error_str, sizeof(req->error_str), 2033 "error %d returned for DIOCGMEDIASIZE " 2034 " ioctl on %s!", error, 2035 be_lun->dev_path); 2036 return (error); 2037 } 2038 2039 if (params->lun_size_bytes != 0) { 2040 if (params->lun_size_bytes > otmp) { 2041 dev_relthread(dev, ref); 2042 snprintf(req->error_str, sizeof(req->error_str), 2043 "requested LUN size %ju > backing device " 2044 "size %ju", 2045 (uintmax_t)params->lun_size_bytes, 2046 (uintmax_t)otmp); 2047 return (EINVAL); 2048 } 2049 2050 be_lun->size_bytes = params->lun_size_bytes; 2051 } else 2052 be_lun->size_bytes = otmp; 2053 be_lun->size_blocks = be_lun->size_bytes / cbe_lun->blocksize; 2054 cbe_lun->maxlba = (be_lun->size_blocks == 0) ? 2055 0 : (be_lun->size_blocks - 1); 2056 2057 error = csw->d_ioctl(dev, DIOCGSTRIPESIZE, (caddr_t)&ps, FREAD, 2058 curthread); 2059 if (error) 2060 ps = po = 0; 2061 else { 2062 error = csw->d_ioctl(dev, DIOCGSTRIPEOFFSET, (caddr_t)&po, 2063 FREAD, curthread); 2064 if (error) 2065 po = 0; 2066 } 2067 us = ps; 2068 uo = po; 2069 2070 value = ctl_get_opt(&cbe_lun->options, "pblocksize"); 2071 if (value != NULL) 2072 ctl_expand_number(value, &ps); 2073 value = ctl_get_opt(&cbe_lun->options, "pblockoffset"); 2074 if (value != NULL) 2075 ctl_expand_number(value, &po); 2076 pss = ps / cbe_lun->blocksize; 2077 pos = po / cbe_lun->blocksize; 2078 if ((pss > 0) && (pss * cbe_lun->blocksize == ps) && (pss >= pos) && 2079 ((pss & (pss - 1)) == 0) && (pos * cbe_lun->blocksize == po)) { 2080 cbe_lun->pblockexp = fls(pss) - 1; 2081 cbe_lun->pblockoff = (pss - pos) % pss; 2082 } 2083 2084 value = ctl_get_opt(&cbe_lun->options, "ublocksize"); 2085 if (value != NULL) 2086 ctl_expand_number(value, &us); 2087 value = ctl_get_opt(&cbe_lun->options, "ublockoffset"); 2088 if (value != NULL) 2089 ctl_expand_number(value, &uo); 2090 uss = us / cbe_lun->blocksize; 2091 uos = uo / cbe_lun->blocksize; 2092 if ((uss > 0) && (uss * cbe_lun->blocksize == us) && (uss >= uos) && 2093 ((uss & (uss - 1)) == 0) && (uos * cbe_lun->blocksize == uo)) { 2094 cbe_lun->ublockexp = fls(uss) - 1; 2095 cbe_lun->ublockoff = (uss - uos) % uss; 2096 } 2097 2098 cbe_lun->atomicblock = atomic / cbe_lun->blocksize; 2099 cbe_lun->opttxferlen = maxio / cbe_lun->blocksize; 2100 2101 if (be_lun->dispatch == ctl_be_block_dispatch_zvol) { 2102 unmap = 1; 2103 } else { 2104 struct diocgattr_arg arg; 2105 2106 strlcpy(arg.name, "GEOM::candelete", sizeof(arg.name)); 2107 arg.len = sizeof(arg.value.i); 2108 error = csw->d_ioctl(dev, DIOCGATTR, (caddr_t)&arg, FREAD, 2109 curthread); 2110 unmap = (error == 0) ? arg.value.i : 0; 2111 } 2112 value = ctl_get_opt(&cbe_lun->options, "unmap"); 2113 if (value != NULL) 2114 unmap = (strcmp(value, "on") == 0); 2115 if (unmap) 2116 cbe_lun->flags |= CTL_LUN_FLAG_UNMAP; 2117 else 2118 cbe_lun->flags &= ~CTL_LUN_FLAG_UNMAP; 2119 2120 dev_relthread(dev, ref); 2121 return (0); 2122} 2123 2124static int 2125ctl_be_block_close(struct ctl_be_block_lun *be_lun) 2126{ 2127 struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun; 2128 int flags; 2129 2130 if (be_lun->vn) { 2131 flags = FREAD; 2132 if ((cbe_lun->flags & CTL_LUN_FLAG_READONLY) == 0) 2133 flags |= FWRITE; 2134 (void)vn_close(be_lun->vn, flags, NOCRED, curthread); 2135 be_lun->vn = NULL; 2136 2137 switch (be_lun->dev_type) { 2138 case CTL_BE_BLOCK_DEV: 2139 break; 2140 case CTL_BE_BLOCK_FILE: 2141 if (be_lun->backend.file.cred != NULL) { 2142 crfree(be_lun->backend.file.cred); 2143 be_lun->backend.file.cred = NULL; 2144 } 2145 break; 2146 case CTL_BE_BLOCK_NONE: 2147 break; 2148 default: 2149 panic("Unexpected backend type."); 2150 break; 2151 } 2152 be_lun->dev_type = CTL_BE_BLOCK_NONE; 2153 } 2154 return (0); 2155} 2156 2157static int 2158ctl_be_block_open(struct ctl_be_block_softc *softc, 2159 struct ctl_be_block_lun *be_lun, struct ctl_lun_req *req) 2160{ 2161 struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun; 2162 struct nameidata nd; 2163 char *value; 2164 int error, flags; 2165 2166 error = 0; 2167 if (rootvnode == NULL) { 2168 snprintf(req->error_str, sizeof(req->error_str), 2169 "Root filesystem is not mounted"); 2170 return (1); 2171 } 2172 pwd_ensure_dirs(); 2173 2174 value = ctl_get_opt(&cbe_lun->options, "file"); 2175 if (value == NULL) { 2176 snprintf(req->error_str, sizeof(req->error_str), 2177 "no file argument specified"); 2178 return (1); 2179 } 2180 free(be_lun->dev_path, M_CTLBLK); 2181 be_lun->dev_path = strdup(value, M_CTLBLK); 2182 2183 flags = FREAD; 2184 value = ctl_get_opt(&cbe_lun->options, "readonly"); 2185 if (value == NULL || strcmp(value, "on") != 0) 2186 flags |= FWRITE; 2187 2188again: 2189 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, be_lun->dev_path, curthread); 2190 error = vn_open(&nd, &flags, 0, NULL); 2191 if ((error == EROFS || error == EACCES) && (flags & FWRITE)) { 2192 flags &= ~FWRITE; 2193 goto again; 2194 } 2195 if (error) { 2196 /* 2197 * This is the only reasonable guess we can make as far as 2198 * path if the user doesn't give us a fully qualified path. 2199 * If they want to specify a file, they need to specify the 2200 * full path. 2201 */ 2202 if (be_lun->dev_path[0] != '/') { 2203 char *dev_name; 2204 2205 asprintf(&dev_name, M_CTLBLK, "/dev/%s", 2206 be_lun->dev_path); 2207 free(be_lun->dev_path, M_CTLBLK); 2208 be_lun->dev_path = dev_name; 2209 goto again; 2210 } 2211 snprintf(req->error_str, sizeof(req->error_str), 2212 "error opening %s: %d", be_lun->dev_path, error); 2213 return (error); 2214 } 2215 if (flags & FWRITE) 2216 cbe_lun->flags &= ~CTL_LUN_FLAG_READONLY; 2217 else 2218 cbe_lun->flags |= CTL_LUN_FLAG_READONLY; 2219 2220 NDFREE(&nd, NDF_ONLY_PNBUF); 2221 be_lun->vn = nd.ni_vp; 2222 2223 /* We only support disks and files. */ 2224 if (vn_isdisk(be_lun->vn, &error)) { 2225 error = ctl_be_block_open_dev(be_lun, req); 2226 } else if (be_lun->vn->v_type == VREG) { 2227 error = ctl_be_block_open_file(be_lun, req); 2228 } else { 2229 error = EINVAL; 2230 snprintf(req->error_str, sizeof(req->error_str), 2231 "%s is not a disk or plain file", be_lun->dev_path); 2232 } 2233 VOP_UNLOCK(be_lun->vn, 0); 2234 2235 if (error != 0) 2236 ctl_be_block_close(be_lun); 2237 cbe_lun->serseq = CTL_LUN_SERSEQ_OFF; 2238 if (be_lun->dispatch != ctl_be_block_dispatch_dev) 2239 cbe_lun->serseq = CTL_LUN_SERSEQ_READ; 2240 value = ctl_get_opt(&cbe_lun->options, "serseq"); 2241 if (value != NULL && strcmp(value, "on") == 0) 2242 cbe_lun->serseq = CTL_LUN_SERSEQ_ON; 2243 else if (value != NULL && strcmp(value, "read") == 0) 2244 cbe_lun->serseq = CTL_LUN_SERSEQ_READ; 2245 else if (value != NULL && strcmp(value, "off") == 0) 2246 cbe_lun->serseq = CTL_LUN_SERSEQ_OFF; 2247 return (0); 2248} 2249 2250static int 2251ctl_be_block_create(struct ctl_be_block_softc *softc, struct ctl_lun_req *req) 2252{ 2253 struct ctl_be_lun *cbe_lun; 2254 struct ctl_be_block_lun *be_lun; 2255 struct ctl_lun_create_params *params; 2256 char num_thread_str[16]; 2257 char tmpstr[32]; 2258 char *value; 2259 int retval, num_threads; 2260 int tmp_num_threads; 2261 2262 params = &req->reqdata.create; 2263 retval = 0; 2264 req->status = CTL_LUN_OK; 2265 2266 be_lun = malloc(sizeof(*be_lun), M_CTLBLK, M_ZERO | M_WAITOK); 2267 cbe_lun = &be_lun->cbe_lun; 2268 cbe_lun->be_lun = be_lun; 2269 be_lun->params = req->reqdata.create; 2270 be_lun->softc = softc; 2271 STAILQ_INIT(&be_lun->input_queue); 2272 STAILQ_INIT(&be_lun->config_read_queue); 2273 STAILQ_INIT(&be_lun->config_write_queue); 2274 STAILQ_INIT(&be_lun->datamove_queue); 2275 sprintf(be_lun->lunname, "cblk%d", softc->num_luns); 2276 mtx_init(&be_lun->io_lock, "cblk io lock", NULL, MTX_DEF); 2277 mtx_init(&be_lun->queue_lock, "cblk queue lock", NULL, MTX_DEF); 2278 ctl_init_opts(&cbe_lun->options, 2279 req->num_be_args, req->kern_be_args); 2280 be_lun->lun_zone = uma_zcreate(be_lun->lunname, CTLBLK_MAX_SEG, 2281 NULL, NULL, NULL, NULL, /*align*/ 0, /*flags*/0); 2282 if (be_lun->lun_zone == NULL) { 2283 snprintf(req->error_str, sizeof(req->error_str), 2284 "error allocating UMA zone"); 2285 goto bailout_error; 2286 } 2287 2288 if (params->flags & CTL_LUN_FLAG_DEV_TYPE) 2289 cbe_lun->lun_type = params->device_type; 2290 else 2291 cbe_lun->lun_type = T_DIRECT; 2292 be_lun->flags = CTL_BE_BLOCK_LUN_UNCONFIGURED; 2293 cbe_lun->flags = 0; 2294 value = ctl_get_opt(&cbe_lun->options, "ha_role"); 2295 if (value != NULL) { 2296 if (strcmp(value, "primary") == 0) 2297 cbe_lun->flags |= CTL_LUN_FLAG_PRIMARY; 2298 } else if (control_softc->flags & CTL_FLAG_ACTIVE_SHELF) 2299 cbe_lun->flags |= CTL_LUN_FLAG_PRIMARY; 2300 2301 if (cbe_lun->lun_type == T_DIRECT) { 2302 be_lun->size_bytes = params->lun_size_bytes; 2303 if (params->blocksize_bytes != 0) 2304 cbe_lun->blocksize = params->blocksize_bytes; 2305 else 2306 cbe_lun->blocksize = 512; 2307 be_lun->size_blocks = be_lun->size_bytes / cbe_lun->blocksize; 2308 cbe_lun->maxlba = (be_lun->size_blocks == 0) ? 2309 0 : (be_lun->size_blocks - 1); 2310 2311 if ((cbe_lun->flags & CTL_LUN_FLAG_PRIMARY) || 2312 control_softc->ha_mode == CTL_HA_MODE_SER_ONLY) { 2313 retval = ctl_be_block_open(softc, be_lun, req); 2314 if (retval != 0) { 2315 retval = 0; 2316 req->status = CTL_LUN_WARNING; 2317 } 2318 } 2319 num_threads = cbb_num_threads; 2320 } else { 2321 num_threads = 1; 2322 } 2323 2324 /* 2325 * XXX This searching loop might be refactored to be combined with 2326 * the loop above, 2327 */ 2328 value = ctl_get_opt(&cbe_lun->options, "num_threads"); 2329 if (value != NULL) { 2330 tmp_num_threads = strtol(value, NULL, 0); 2331 2332 /* 2333 * We don't let the user specify less than one 2334 * thread, but hope he's clueful enough not to 2335 * specify 1000 threads. 2336 */ 2337 if (tmp_num_threads < 1) { 2338 snprintf(req->error_str, sizeof(req->error_str), 2339 "invalid number of threads %s", 2340 num_thread_str); 2341 goto bailout_error; 2342 } 2343 num_threads = tmp_num_threads; 2344 } 2345 2346 if (be_lun->vn == NULL) 2347 cbe_lun->flags |= CTL_LUN_FLAG_OFFLINE; 2348 /* Tell the user the blocksize we ended up using */ 2349 params->lun_size_bytes = be_lun->size_bytes; 2350 params->blocksize_bytes = cbe_lun->blocksize; 2351 if (params->flags & CTL_LUN_FLAG_ID_REQ) { 2352 cbe_lun->req_lun_id = params->req_lun_id; 2353 cbe_lun->flags |= CTL_LUN_FLAG_ID_REQ; 2354 } else 2355 cbe_lun->req_lun_id = 0; 2356 2357 cbe_lun->lun_shutdown = ctl_be_block_lun_shutdown; 2358 cbe_lun->lun_config_status = ctl_be_block_lun_config_status; 2359 cbe_lun->be = &ctl_be_block_driver; 2360 2361 if ((params->flags & CTL_LUN_FLAG_SERIAL_NUM) == 0) { 2362 snprintf(tmpstr, sizeof(tmpstr), "MYSERIAL%4d", 2363 softc->num_luns); 2364 strncpy((char *)cbe_lun->serial_num, tmpstr, 2365 MIN(sizeof(cbe_lun->serial_num), sizeof(tmpstr))); 2366 2367 /* Tell the user what we used for a serial number */ 2368 strncpy((char *)params->serial_num, tmpstr, 2369 MIN(sizeof(params->serial_num), sizeof(tmpstr))); 2370 } else { 2371 strncpy((char *)cbe_lun->serial_num, params->serial_num, 2372 MIN(sizeof(cbe_lun->serial_num), 2373 sizeof(params->serial_num))); 2374 } 2375 if ((params->flags & CTL_LUN_FLAG_DEVID) == 0) { 2376 snprintf(tmpstr, sizeof(tmpstr), "MYDEVID%4d", softc->num_luns); 2377 strncpy((char *)cbe_lun->device_id, tmpstr, 2378 MIN(sizeof(cbe_lun->device_id), sizeof(tmpstr))); 2379 2380 /* Tell the user what we used for a device ID */ 2381 strncpy((char *)params->device_id, tmpstr, 2382 MIN(sizeof(params->device_id), sizeof(tmpstr))); 2383 } else { 2384 strncpy((char *)cbe_lun->device_id, params->device_id, 2385 MIN(sizeof(cbe_lun->device_id), 2386 sizeof(params->device_id))); 2387 } 2388 2389 TASK_INIT(&be_lun->io_task, /*priority*/0, ctl_be_block_worker, be_lun); 2390 2391 be_lun->io_taskqueue = taskqueue_create(be_lun->lunname, M_WAITOK, 2392 taskqueue_thread_enqueue, /*context*/&be_lun->io_taskqueue); 2393 2394 if (be_lun->io_taskqueue == NULL) { 2395 snprintf(req->error_str, sizeof(req->error_str), 2396 "unable to create taskqueue"); 2397 goto bailout_error; 2398 } 2399 2400 /* 2401 * Note that we start the same number of threads by default for 2402 * both the file case and the block device case. For the file 2403 * case, we need multiple threads to allow concurrency, because the 2404 * vnode interface is designed to be a blocking interface. For the 2405 * block device case, ZFS zvols at least will block the caller's 2406 * context in many instances, and so we need multiple threads to 2407 * overcome that problem. Other block devices don't need as many 2408 * threads, but they shouldn't cause too many problems. 2409 * 2410 * If the user wants to just have a single thread for a block 2411 * device, he can specify that when the LUN is created, or change 2412 * the tunable/sysctl to alter the default number of threads. 2413 */ 2414 retval = taskqueue_start_threads(&be_lun->io_taskqueue, 2415 /*num threads*/num_threads, 2416 /*priority*/PWAIT, 2417 /*thread name*/ 2418 "%s taskq", be_lun->lunname); 2419 2420 if (retval != 0) 2421 goto bailout_error; 2422 2423 be_lun->num_threads = num_threads; 2424 2425 mtx_lock(&softc->lock); 2426 softc->num_luns++; 2427 STAILQ_INSERT_TAIL(&softc->lun_list, be_lun, links); 2428 2429 mtx_unlock(&softc->lock); 2430 2431 retval = ctl_add_lun(&be_lun->cbe_lun); 2432 if (retval != 0) { 2433 mtx_lock(&softc->lock); 2434 STAILQ_REMOVE(&softc->lun_list, be_lun, ctl_be_block_lun, 2435 links); 2436 softc->num_luns--; 2437 mtx_unlock(&softc->lock); 2438 snprintf(req->error_str, sizeof(req->error_str), 2439 "ctl_add_lun() returned error %d, see dmesg for " 2440 "details", retval); 2441 retval = 0; 2442 goto bailout_error; 2443 } 2444 2445 mtx_lock(&softc->lock); 2446 2447 /* 2448 * Tell the config_status routine that we're waiting so it won't 2449 * clean up the LUN in the event of an error. 2450 */ 2451 be_lun->flags |= CTL_BE_BLOCK_LUN_WAITING; 2452 2453 while (be_lun->flags & CTL_BE_BLOCK_LUN_UNCONFIGURED) { 2454 retval = msleep(be_lun, &softc->lock, PCATCH, "ctlblk", 0); 2455 if (retval == EINTR) 2456 break; 2457 } 2458 be_lun->flags &= ~CTL_BE_BLOCK_LUN_WAITING; 2459 2460 if (be_lun->flags & CTL_BE_BLOCK_LUN_CONFIG_ERR) { 2461 snprintf(req->error_str, sizeof(req->error_str), 2462 "LUN configuration error, see dmesg for details"); 2463 STAILQ_REMOVE(&softc->lun_list, be_lun, ctl_be_block_lun, 2464 links); 2465 softc->num_luns--; 2466 mtx_unlock(&softc->lock); 2467 goto bailout_error; 2468 } else { 2469 params->req_lun_id = cbe_lun->lun_id; 2470 } 2471 2472 mtx_unlock(&softc->lock); 2473 2474 be_lun->disk_stats = devstat_new_entry("cbb", params->req_lun_id, 2475 cbe_lun->blocksize, 2476 DEVSTAT_ALL_SUPPORTED, 2477 cbe_lun->lun_type 2478 | DEVSTAT_TYPE_IF_OTHER, 2479 DEVSTAT_PRIORITY_OTHER); 2480 2481 return (retval); 2482 2483bailout_error: 2484 req->status = CTL_LUN_ERROR; 2485 2486 if (be_lun->io_taskqueue != NULL) 2487 taskqueue_free(be_lun->io_taskqueue); 2488 ctl_be_block_close(be_lun); 2489 if (be_lun->dev_path != NULL) 2490 free(be_lun->dev_path, M_CTLBLK); 2491 if (be_lun->lun_zone != NULL) 2492 uma_zdestroy(be_lun->lun_zone); 2493 ctl_free_opts(&cbe_lun->options); 2494 mtx_destroy(&be_lun->queue_lock); 2495 mtx_destroy(&be_lun->io_lock); 2496 free(be_lun, M_CTLBLK); 2497 2498 return (retval); 2499} 2500 2501static int 2502ctl_be_block_rm(struct ctl_be_block_softc *softc, struct ctl_lun_req *req) 2503{ 2504 struct ctl_lun_rm_params *params; 2505 struct ctl_be_block_lun *be_lun; 2506 struct ctl_be_lun *cbe_lun; 2507 int retval; 2508 2509 params = &req->reqdata.rm; 2510 2511 mtx_lock(&softc->lock); 2512 STAILQ_FOREACH(be_lun, &softc->lun_list, links) { 2513 if (be_lun->cbe_lun.lun_id == params->lun_id) 2514 break; 2515 } 2516 mtx_unlock(&softc->lock); 2517 2518 if (be_lun == NULL) { 2519 snprintf(req->error_str, sizeof(req->error_str), 2520 "LUN %u is not managed by the block backend", 2521 params->lun_id); 2522 goto bailout_error; 2523 } 2524 cbe_lun = &be_lun->cbe_lun; 2525 2526 retval = ctl_disable_lun(cbe_lun); 2527 if (retval != 0) { 2528 snprintf(req->error_str, sizeof(req->error_str), 2529 "error %d returned from ctl_disable_lun() for " 2530 "LUN %d", retval, params->lun_id); 2531 goto bailout_error; 2532 } 2533 2534 if (be_lun->vn != NULL) { 2535 cbe_lun->flags |= CTL_LUN_FLAG_OFFLINE; 2536 ctl_lun_offline(cbe_lun); 2537 taskqueue_drain_all(be_lun->io_taskqueue); 2538 ctl_be_block_close(be_lun); 2539 } 2540 2541 retval = ctl_invalidate_lun(cbe_lun); 2542 if (retval != 0) { 2543 snprintf(req->error_str, sizeof(req->error_str), 2544 "error %d returned from ctl_invalidate_lun() for " 2545 "LUN %d", retval, params->lun_id); 2546 goto bailout_error; 2547 } 2548 2549 mtx_lock(&softc->lock); 2550 be_lun->flags |= CTL_BE_BLOCK_LUN_WAITING; 2551 while ((be_lun->flags & CTL_BE_BLOCK_LUN_UNCONFIGURED) == 0) { 2552 retval = msleep(be_lun, &softc->lock, PCATCH, "ctlblk", 0); 2553 if (retval == EINTR) 2554 break; 2555 } 2556 be_lun->flags &= ~CTL_BE_BLOCK_LUN_WAITING; 2557 2558 if ((be_lun->flags & CTL_BE_BLOCK_LUN_UNCONFIGURED) == 0) { 2559 snprintf(req->error_str, sizeof(req->error_str), 2560 "interrupted waiting for LUN to be freed"); 2561 mtx_unlock(&softc->lock); 2562 goto bailout_error; 2563 } 2564 2565 STAILQ_REMOVE(&softc->lun_list, be_lun, ctl_be_block_lun, links); 2566 2567 softc->num_luns--; 2568 mtx_unlock(&softc->lock); 2569 2570 taskqueue_drain_all(be_lun->io_taskqueue); 2571 taskqueue_free(be_lun->io_taskqueue); 2572 2573 if (be_lun->disk_stats != NULL) 2574 devstat_remove_entry(be_lun->disk_stats); 2575 2576 uma_zdestroy(be_lun->lun_zone); 2577 2578 ctl_free_opts(&cbe_lun->options); 2579 free(be_lun->dev_path, M_CTLBLK); 2580 mtx_destroy(&be_lun->queue_lock); 2581 mtx_destroy(&be_lun->io_lock); 2582 free(be_lun, M_CTLBLK); 2583 2584 req->status = CTL_LUN_OK; 2585 2586 return (0); 2587 2588bailout_error: 2589 2590 req->status = CTL_LUN_ERROR; 2591 2592 return (0); 2593} 2594 2595static int 2596ctl_be_block_modify_file(struct ctl_be_block_lun *be_lun, 2597 struct ctl_lun_req *req) 2598{ 2599 struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun; 2600 struct vattr vattr; 2601 int error; 2602 struct ctl_lun_create_params *params = &be_lun->params; 2603 2604 if (params->lun_size_bytes != 0) { 2605 be_lun->size_bytes = params->lun_size_bytes; 2606 } else { 2607 vn_lock(be_lun->vn, LK_SHARED | LK_RETRY); 2608 error = VOP_GETATTR(be_lun->vn, &vattr, curthread->td_ucred); 2609 VOP_UNLOCK(be_lun->vn, 0); 2610 if (error != 0) { 2611 snprintf(req->error_str, sizeof(req->error_str), 2612 "error calling VOP_GETATTR() for file %s", 2613 be_lun->dev_path); 2614 return (error); 2615 } 2616 be_lun->size_bytes = vattr.va_size; 2617 } 2618 be_lun->size_blocks = be_lun->size_bytes / cbe_lun->blocksize; 2619 cbe_lun->maxlba = (be_lun->size_blocks == 0) ? 2620 0 : (be_lun->size_blocks - 1); 2621 return (0); 2622} 2623 2624static int 2625ctl_be_block_modify_dev(struct ctl_be_block_lun *be_lun, 2626 struct ctl_lun_req *req) 2627{ 2628 struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun; 2629 struct ctl_lun_create_params *params = &be_lun->params; 2630 struct cdevsw *csw; 2631 struct cdev *dev; 2632 uint64_t size_bytes; 2633 int error, ref; 2634 2635 csw = devvn_refthread(be_lun->vn, &dev, &ref); 2636 if (csw == NULL) 2637 return (ENXIO); 2638 if (csw->d_ioctl == NULL) { 2639 dev_relthread(dev, ref); 2640 snprintf(req->error_str, sizeof(req->error_str), 2641 "no d_ioctl for device %s!", be_lun->dev_path); 2642 return (ENODEV); 2643 } 2644 2645 error = csw->d_ioctl(dev, DIOCGMEDIASIZE, (caddr_t)&size_bytes, FREAD, 2646 curthread); 2647 dev_relthread(dev, ref); 2648 if (error) { 2649 snprintf(req->error_str, sizeof(req->error_str), 2650 "error %d returned for DIOCGMEDIASIZE ioctl " 2651 "on %s!", error, be_lun->dev_path); 2652 return (error); 2653 } 2654 2655 if (params->lun_size_bytes != 0) { 2656 if (params->lun_size_bytes > size_bytes) { 2657 snprintf(req->error_str, sizeof(req->error_str), 2658 "requested LUN size %ju > backing device " 2659 "size %ju", 2660 (uintmax_t)params->lun_size_bytes, 2661 (uintmax_t)size_bytes); 2662 return (EINVAL); 2663 } 2664 be_lun->size_bytes = params->lun_size_bytes; 2665 } else { 2666 be_lun->size_bytes = size_bytes; 2667 } 2668 be_lun->size_blocks = be_lun->size_bytes / cbe_lun->blocksize; 2669 cbe_lun->maxlba = (be_lun->size_blocks == 0) ? 2670 0 : (be_lun->size_blocks - 1); 2671 return (0); 2672} 2673 2674static int 2675ctl_be_block_modify(struct ctl_be_block_softc *softc, struct ctl_lun_req *req) 2676{ 2677 struct ctl_lun_modify_params *params; 2678 struct ctl_be_block_lun *be_lun; 2679 struct ctl_be_lun *cbe_lun; 2680 char *value; 2681 uint64_t oldsize; 2682 int error, wasprim; 2683 2684 params = &req->reqdata.modify; 2685 2686 mtx_lock(&softc->lock); 2687 STAILQ_FOREACH(be_lun, &softc->lun_list, links) { 2688 if (be_lun->cbe_lun.lun_id == params->lun_id) 2689 break; 2690 } 2691 mtx_unlock(&softc->lock); 2692 2693 if (be_lun == NULL) { 2694 snprintf(req->error_str, sizeof(req->error_str), 2695 "LUN %u is not managed by the block backend", 2696 params->lun_id); 2697 goto bailout_error; 2698 } 2699 cbe_lun = &be_lun->cbe_lun; 2700 2701 if (params->lun_size_bytes != 0) 2702 be_lun->params.lun_size_bytes = params->lun_size_bytes; 2703 ctl_update_opts(&cbe_lun->options, req->num_be_args, req->kern_be_args); 2704 2705 wasprim = (cbe_lun->flags & CTL_LUN_FLAG_PRIMARY); 2706 value = ctl_get_opt(&cbe_lun->options, "ha_role"); 2707 if (value != NULL) { 2708 if (strcmp(value, "primary") == 0) 2709 cbe_lun->flags |= CTL_LUN_FLAG_PRIMARY; 2710 else 2711 cbe_lun->flags &= ~CTL_LUN_FLAG_PRIMARY; 2712 } else if (control_softc->flags & CTL_FLAG_ACTIVE_SHELF) 2713 cbe_lun->flags |= CTL_LUN_FLAG_PRIMARY; 2714 else 2715 cbe_lun->flags &= ~CTL_LUN_FLAG_PRIMARY; 2716 if (wasprim != (cbe_lun->flags & CTL_LUN_FLAG_PRIMARY)) { 2717 if (cbe_lun->flags & CTL_LUN_FLAG_PRIMARY) 2718 ctl_lun_primary(cbe_lun); 2719 else 2720 ctl_lun_secondary(cbe_lun); 2721 } 2722 2723 oldsize = be_lun->size_blocks; 2724 if ((cbe_lun->flags & CTL_LUN_FLAG_PRIMARY) || 2725 control_softc->ha_mode == CTL_HA_MODE_SER_ONLY) { 2726 if (be_lun->vn == NULL) 2727 error = ctl_be_block_open(softc, be_lun, req); 2728 else if (vn_isdisk(be_lun->vn, &error)) 2729 error = ctl_be_block_modify_dev(be_lun, req); 2730 else if (be_lun->vn->v_type == VREG) 2731 error = ctl_be_block_modify_file(be_lun, req); 2732 else 2733 error = EINVAL; 2734 if ((cbe_lun->flags & CTL_LUN_FLAG_OFFLINE) && 2735 be_lun->vn != NULL) { 2736 cbe_lun->flags &= ~CTL_LUN_FLAG_OFFLINE; 2737 ctl_lun_online(cbe_lun); 2738 } 2739 } else { 2740 if (be_lun->vn != NULL) { 2741 cbe_lun->flags |= CTL_LUN_FLAG_OFFLINE; 2742 ctl_lun_offline(cbe_lun); 2743 taskqueue_drain_all(be_lun->io_taskqueue); 2744 error = ctl_be_block_close(be_lun); 2745 } else 2746 error = 0; 2747 } 2748 if (be_lun->size_blocks != oldsize) 2749 ctl_lun_capacity_changed(cbe_lun); 2750 2751 /* Tell the user the exact size we ended up using */ 2752 params->lun_size_bytes = be_lun->size_bytes; 2753 2754 req->status = error ? CTL_LUN_WARNING : CTL_LUN_OK; 2755 return (0); 2756 2757bailout_error: 2758 req->status = CTL_LUN_ERROR; 2759 return (0); 2760} 2761 2762static void 2763ctl_be_block_lun_shutdown(void *be_lun) 2764{ 2765 struct ctl_be_block_lun *lun; 2766 struct ctl_be_block_softc *softc; 2767 2768 lun = (struct ctl_be_block_lun *)be_lun; 2769 2770 softc = lun->softc; 2771 2772 mtx_lock(&softc->lock); 2773 lun->flags |= CTL_BE_BLOCK_LUN_UNCONFIGURED; 2774 if (lun->flags & CTL_BE_BLOCK_LUN_WAITING) 2775 wakeup(lun); 2776 mtx_unlock(&softc->lock); 2777 2778} 2779 2780static void 2781ctl_be_block_lun_config_status(void *be_lun, ctl_lun_config_status status) 2782{ 2783 struct ctl_be_block_lun *lun; 2784 struct ctl_be_block_softc *softc; 2785 2786 lun = (struct ctl_be_block_lun *)be_lun; 2787 softc = lun->softc; 2788 2789 if (status == CTL_LUN_CONFIG_OK) { 2790 mtx_lock(&softc->lock); 2791 lun->flags &= ~CTL_BE_BLOCK_LUN_UNCONFIGURED; 2792 if (lun->flags & CTL_BE_BLOCK_LUN_WAITING) 2793 wakeup(lun); 2794 mtx_unlock(&softc->lock); 2795 2796 /* 2797 * We successfully added the LUN, attempt to enable it. 2798 */ 2799 if (ctl_enable_lun(&lun->cbe_lun) != 0) { 2800 printf("%s: ctl_enable_lun() failed!\n", __func__); 2801 if (ctl_invalidate_lun(&lun->cbe_lun) != 0) { 2802 printf("%s: ctl_invalidate_lun() failed!\n", 2803 __func__); 2804 } 2805 } 2806 2807 return; 2808 } 2809 2810 2811 mtx_lock(&softc->lock); 2812 lun->flags &= ~CTL_BE_BLOCK_LUN_UNCONFIGURED; 2813 lun->flags |= CTL_BE_BLOCK_LUN_CONFIG_ERR; 2814 wakeup(lun); 2815 mtx_unlock(&softc->lock); 2816} 2817 2818 2819static int 2820ctl_be_block_config_write(union ctl_io *io) 2821{ 2822 struct ctl_be_block_lun *be_lun; 2823 struct ctl_be_lun *cbe_lun; 2824 int retval; 2825 2826 retval = 0; 2827 2828 DPRINTF("entered\n"); 2829 2830 cbe_lun = (struct ctl_be_lun *)io->io_hdr.ctl_private[ 2831 CTL_PRIV_BACKEND_LUN].ptr; 2832 be_lun = (struct ctl_be_block_lun *)cbe_lun->be_lun; 2833 2834 switch (io->scsiio.cdb[0]) { 2835 case SYNCHRONIZE_CACHE: 2836 case SYNCHRONIZE_CACHE_16: 2837 case WRITE_SAME_10: 2838 case WRITE_SAME_16: 2839 case UNMAP: 2840 /* 2841 * The upper level CTL code will filter out any CDBs with 2842 * the immediate bit set and return the proper error. 2843 * 2844 * We don't really need to worry about what LBA range the 2845 * user asked to be synced out. When they issue a sync 2846 * cache command, we'll sync out the whole thing. 2847 */ 2848 mtx_lock(&be_lun->queue_lock); 2849 STAILQ_INSERT_TAIL(&be_lun->config_write_queue, &io->io_hdr, 2850 links); 2851 mtx_unlock(&be_lun->queue_lock); 2852 taskqueue_enqueue(be_lun->io_taskqueue, &be_lun->io_task); 2853 break; 2854 case START_STOP_UNIT: { 2855 struct scsi_start_stop_unit *cdb; 2856 2857 cdb = (struct scsi_start_stop_unit *)io->scsiio.cdb; 2858 2859 if (cdb->how & SSS_START) 2860 retval = ctl_start_lun(cbe_lun); 2861 else { 2862 retval = ctl_stop_lun(cbe_lun); 2863 /* 2864 * XXX KDM Copan-specific offline behavior. 2865 * Figure out a reasonable way to port this? 2866 */ 2867#ifdef NEEDTOPORT 2868 if ((retval == 0) 2869 && (cdb->byte2 & SSS_ONOFFLINE)) 2870 retval = ctl_lun_offline(cbe_lun); 2871#endif 2872 } 2873 2874 /* 2875 * In general, the above routines should not fail. They 2876 * just set state for the LUN. So we've got something 2877 * pretty wrong here if we can't start or stop the LUN. 2878 */ 2879 if (retval != 0) { 2880 ctl_set_internal_failure(&io->scsiio, 2881 /*sks_valid*/ 1, 2882 /*retry_count*/ 0xf051); 2883 retval = CTL_RETVAL_COMPLETE; 2884 } else { 2885 ctl_set_success(&io->scsiio); 2886 } 2887 ctl_config_write_done(io); 2888 break; 2889 } 2890 default: 2891 ctl_set_invalid_opcode(&io->scsiio); 2892 ctl_config_write_done(io); 2893 retval = CTL_RETVAL_COMPLETE; 2894 break; 2895 } 2896 2897 return (retval); 2898} 2899 2900static int 2901ctl_be_block_config_read(union ctl_io *io) 2902{ 2903 struct ctl_be_block_lun *be_lun; 2904 struct ctl_be_lun *cbe_lun; 2905 int retval = 0; 2906 2907 DPRINTF("entered\n"); 2908 2909 cbe_lun = (struct ctl_be_lun *)io->io_hdr.ctl_private[ 2910 CTL_PRIV_BACKEND_LUN].ptr; 2911 be_lun = (struct ctl_be_block_lun *)cbe_lun->be_lun; 2912 2913 switch (io->scsiio.cdb[0]) { 2914 case SERVICE_ACTION_IN: 2915 if (io->scsiio.cdb[1] == SGLS_SERVICE_ACTION) { 2916 mtx_lock(&be_lun->queue_lock); 2917 STAILQ_INSERT_TAIL(&be_lun->config_read_queue, 2918 &io->io_hdr, links); 2919 mtx_unlock(&be_lun->queue_lock); 2920 taskqueue_enqueue(be_lun->io_taskqueue, 2921 &be_lun->io_task); 2922 retval = CTL_RETVAL_QUEUED; 2923 break; 2924 } 2925 ctl_set_invalid_field(&io->scsiio, 2926 /*sks_valid*/ 1, 2927 /*command*/ 1, 2928 /*field*/ 1, 2929 /*bit_valid*/ 1, 2930 /*bit*/ 4); 2931 ctl_config_read_done(io); 2932 retval = CTL_RETVAL_COMPLETE; 2933 break; 2934 default: 2935 ctl_set_invalid_opcode(&io->scsiio); 2936 ctl_config_read_done(io); 2937 retval = CTL_RETVAL_COMPLETE; 2938 break; 2939 } 2940 2941 return (retval); 2942} 2943 2944static int 2945ctl_be_block_lun_info(void *be_lun, struct sbuf *sb) 2946{ 2947 struct ctl_be_block_lun *lun; 2948 int retval; 2949 2950 lun = (struct ctl_be_block_lun *)be_lun; 2951 retval = 0; 2952 2953 retval = sbuf_printf(sb, "\t<num_threads>"); 2954 2955 if (retval != 0) 2956 goto bailout; 2957 2958 retval = sbuf_printf(sb, "%d", lun->num_threads); 2959 2960 if (retval != 0) 2961 goto bailout; 2962 2963 retval = sbuf_printf(sb, "</num_threads>\n"); 2964 2965bailout: 2966 2967 return (retval); 2968} 2969 2970static uint64_t 2971ctl_be_block_lun_attr(void *be_lun, const char *attrname) 2972{ 2973 struct ctl_be_block_lun *lun = (struct ctl_be_block_lun *)be_lun; 2974 2975 if (lun->getattr == NULL) 2976 return (UINT64_MAX); 2977 return (lun->getattr(lun, attrname)); 2978} 2979 2980int 2981ctl_be_block_init(void) 2982{ 2983 struct ctl_be_block_softc *softc; 2984 int retval; 2985 2986 softc = &backend_block_softc; 2987 retval = 0; 2988 2989 mtx_init(&softc->lock, "ctlblock", NULL, MTX_DEF); 2990 beio_zone = uma_zcreate("beio", sizeof(struct ctl_be_block_io), 2991 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 2992 STAILQ_INIT(&softc->lun_list); 2993 2994 return (retval); 2995} 2996