2 * Copyright (c) 2003 Silicon Graphics International Corp.
3 * Copyright (c) 2009-2011 Spectra Logic Corporation
4 * Copyright (c) 2012 The FreeBSD Foundation
5 * Copyright (c) 2014-2015 Alexander Motin <mav@FreeBSD.org>
8 * Portions of this software were developed by Edward Tomasz Napierala
9 * under sponsorship from the FreeBSD Foundation.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
25 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
26 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
27 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
28 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
32 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
33 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGES.
36 * $Id: //depot/users/kenm/FreeBSD-test2/sys/cam/ctl/ctl_backend_block.c#5 $
39 * CAM Target Layer driver backend for block devices.
41 * Author: Ken Merry <ken@FreeBSD.org>
43 #include <sys/cdefs.h>
44 __FBSDID("$FreeBSD$");
46 #include <opt_kdtrace.h>
48 #include <sys/param.h>
49 #include <sys/systm.h>
50 #include <sys/kernel.h>
51 #include <sys/types.h>
52 #include <sys/kthread.h>
54 #include <sys/fcntl.h>
55 #include <sys/limits.h>
57 #include <sys/mutex.h>
58 #include <sys/condvar.h>
59 #include <sys/malloc.h>
61 #include <sys/ioccom.h>
62 #include <sys/queue.h>
64 #include <sys/endian.h>
67 #include <sys/taskqueue.h>
68 #include <sys/vnode.h>
69 #include <sys/namei.h>
70 #include <sys/mount.h>
72 #include <sys/fcntl.h>
73 #include <sys/filedesc.h>
74 #include <sys/filio.h>
77 #include <sys/module.h>
79 #include <sys/devicestat.h>
80 #include <sys/sysctl.h>
82 #include <geom/geom.h>
85 #include <cam/scsi/scsi_all.h>
86 #include <cam/scsi/scsi_da.h>
87 #include <cam/ctl/ctl_io.h>
88 #include <cam/ctl/ctl.h>
89 #include <cam/ctl/ctl_backend.h>
90 #include <cam/ctl/ctl_ioctl.h>
91 #include <cam/ctl/ctl_ha.h>
92 #include <cam/ctl/ctl_scsi_all.h>
93 #include <cam/ctl/ctl_private.h>
94 #include <cam/ctl/ctl_error.h>
97 * The idea here is that we'll allocate enough S/G space to hold a 1MB
98 * I/O. If we get an I/O larger than that, we'll split it.
100 #define CTLBLK_HALF_IO_SIZE (512 * 1024)
101 #define CTLBLK_MAX_IO_SIZE (CTLBLK_HALF_IO_SIZE * 2)
102 #define CTLBLK_MAX_SEG MAXPHYS
103 #define CTLBLK_HALF_SEGS MAX(CTLBLK_HALF_IO_SIZE / CTLBLK_MAX_SEG, 1)
104 #define CTLBLK_MAX_SEGS (CTLBLK_HALF_SEGS * 2)
107 #define DPRINTF(fmt, args...) \
108 printf("cbb(%s:%d): " fmt, __FUNCTION__, __LINE__, ##args)
110 #define DPRINTF(fmt, args...) do {} while(0)
114 ((struct ctl_ptr_len_flags *)&(io)->io_hdr.ctl_private[CTL_PRIV_BACKEND])
116 ((struct ctl_lba_len_flags *)&(io)->io_hdr.ctl_private[CTL_PRIV_LBA_LEN])
118 SDT_PROVIDER_DEFINE(cbb);
121 CTL_BE_BLOCK_LUN_UNCONFIGURED = 0x01,
122 CTL_BE_BLOCK_LUN_CONFIG_ERR = 0x02,
123 CTL_BE_BLOCK_LUN_WAITING = 0x04,
124 } ctl_be_block_lun_flags;
132 struct ctl_be_block_filedata {
136 union ctl_be_block_bedata {
137 struct ctl_be_block_filedata file;
140 struct ctl_be_block_io;
141 struct ctl_be_block_lun;
143 typedef void (*cbb_dispatch_t)(struct ctl_be_block_lun *be_lun,
144 struct ctl_be_block_io *beio);
145 typedef uint64_t (*cbb_getattr_t)(struct ctl_be_block_lun *be_lun,
146 const char *attrname);
149 * Backend LUN structure. There is a 1:1 mapping between a block device
150 * and a backend block LUN, and between a backend block LUN and a CTL LUN.
152 struct ctl_be_block_lun {
153 struct ctl_lun_create_params params;
156 ctl_be_block_type dev_type;
158 union ctl_be_block_bedata backend;
159 cbb_dispatch_t dispatch;
160 cbb_dispatch_t lun_flush;
161 cbb_dispatch_t unmap;
162 cbb_dispatch_t get_lba_status;
163 cbb_getattr_t getattr;
165 uint64_t size_blocks;
167 struct ctl_be_block_softc *softc;
168 struct devstat *disk_stats;
169 ctl_be_block_lun_flags flags;
170 STAILQ_ENTRY(ctl_be_block_lun) links;
171 struct ctl_be_lun cbe_lun;
172 struct taskqueue *io_taskqueue;
175 STAILQ_HEAD(, ctl_io_hdr) input_queue;
176 STAILQ_HEAD(, ctl_io_hdr) config_read_queue;
177 STAILQ_HEAD(, ctl_io_hdr) config_write_queue;
178 STAILQ_HEAD(, ctl_io_hdr) datamove_queue;
179 struct mtx_padalign io_lock;
180 struct mtx_padalign queue_lock;
184 * Overall softc structure for the block backend module.
186 struct ctl_be_block_softc {
188 uma_zone_t beio_zone;
190 STAILQ_HEAD(, ctl_be_block_lun) lun_list;
193 static struct ctl_be_block_softc backend_block_softc;
196 * Per-I/O information.
198 struct ctl_be_block_io {
200 struct ctl_sg_entry sg_segs[CTLBLK_MAX_SEGS];
201 struct iovec xiovecs[CTLBLK_MAX_SEGS];
208 uint64_t first_error_offset;
209 struct bintime ds_t0;
210 devstat_tag_type ds_tag_type;
211 devstat_trans_flags ds_trans_type;
215 struct ctl_be_block_softc *softc;
216 struct ctl_be_block_lun *lun;
217 void (*beio_cont)(struct ctl_be_block_io *beio); /* to continue processing */
220 extern struct ctl_softc *control_softc;
222 static int cbb_num_threads = 14;
223 TUNABLE_INT("kern.cam.ctl.block.num_threads", &cbb_num_threads);
224 SYSCTL_NODE(_kern_cam_ctl, OID_AUTO, block, CTLFLAG_RD, 0,
225 "CAM Target Layer Block Backend");
226 SYSCTL_INT(_kern_cam_ctl_block, OID_AUTO, num_threads, CTLFLAG_RW,
227 &cbb_num_threads, 0, "Number of threads per backing file");
229 static struct ctl_be_block_io *ctl_alloc_beio(struct ctl_be_block_softc *softc);
230 static void ctl_free_beio(struct ctl_be_block_io *beio);
231 static void ctl_complete_beio(struct ctl_be_block_io *beio);
232 static int ctl_be_block_move_done(union ctl_io *io);
233 static void ctl_be_block_biodone(struct bio *bio);
234 static void ctl_be_block_flush_file(struct ctl_be_block_lun *be_lun,
235 struct ctl_be_block_io *beio);
236 static void ctl_be_block_dispatch_file(struct ctl_be_block_lun *be_lun,
237 struct ctl_be_block_io *beio);
238 static void ctl_be_block_gls_file(struct ctl_be_block_lun *be_lun,
239 struct ctl_be_block_io *beio);
240 static uint64_t ctl_be_block_getattr_file(struct ctl_be_block_lun *be_lun,
241 const char *attrname);
242 static void ctl_be_block_flush_dev(struct ctl_be_block_lun *be_lun,
243 struct ctl_be_block_io *beio);
244 static void ctl_be_block_unmap_dev(struct ctl_be_block_lun *be_lun,
245 struct ctl_be_block_io *beio);
246 static void ctl_be_block_dispatch_dev(struct ctl_be_block_lun *be_lun,
247 struct ctl_be_block_io *beio);
248 static uint64_t ctl_be_block_getattr_dev(struct ctl_be_block_lun *be_lun,
249 const char *attrname);
250 static void ctl_be_block_cr_dispatch(struct ctl_be_block_lun *be_lun,
252 static void ctl_be_block_cw_dispatch(struct ctl_be_block_lun *be_lun,
254 static void ctl_be_block_dispatch(struct ctl_be_block_lun *be_lun,
256 static void ctl_be_block_worker(void *context, int pending);
257 static int ctl_be_block_submit(union ctl_io *io);
258 static int ctl_be_block_ioctl(struct cdev *dev, u_long cmd, caddr_t addr,
259 int flag, struct thread *td);
260 static int ctl_be_block_open_file(struct ctl_be_block_lun *be_lun,
261 struct ctl_lun_req *req);
262 static int ctl_be_block_open_dev(struct ctl_be_block_lun *be_lun,
263 struct ctl_lun_req *req);
264 static int ctl_be_block_close(struct ctl_be_block_lun *be_lun);
265 static int ctl_be_block_open(struct ctl_be_block_lun *be_lun,
266 struct ctl_lun_req *req);
267 static int ctl_be_block_create(struct ctl_be_block_softc *softc,
268 struct ctl_lun_req *req);
269 static int ctl_be_block_rm(struct ctl_be_block_softc *softc,
270 struct ctl_lun_req *req);
271 static int ctl_be_block_modify(struct ctl_be_block_softc *softc,
272 struct ctl_lun_req *req);
273 static void ctl_be_block_lun_shutdown(void *be_lun);
274 static void ctl_be_block_lun_config_status(void *be_lun,
275 ctl_lun_config_status status);
276 static int ctl_be_block_config_write(union ctl_io *io);
277 static int ctl_be_block_config_read(union ctl_io *io);
278 static int ctl_be_block_lun_info(void *be_lun, struct sbuf *sb);
279 static uint64_t ctl_be_block_lun_attr(void *be_lun, const char *attrname);
280 static int ctl_be_block_init(void);
281 static int ctl_be_block_shutdown(void);
283 static struct ctl_backend_driver ctl_be_block_driver =
286 .flags = CTL_BE_FLAG_HAS_CONFIG,
287 .init = ctl_be_block_init,
288 .shutdown = ctl_be_block_shutdown,
289 .data_submit = ctl_be_block_submit,
290 .data_move_done = ctl_be_block_move_done,
291 .config_read = ctl_be_block_config_read,
292 .config_write = ctl_be_block_config_write,
293 .ioctl = ctl_be_block_ioctl,
294 .lun_info = ctl_be_block_lun_info,
295 .lun_attr = ctl_be_block_lun_attr
298 MALLOC_DEFINE(M_CTLBLK, "ctlblk", "Memory used for CTL block backend");
299 CTL_BACKEND_DECLARE(cbb, ctl_be_block_driver);
301 static struct ctl_be_block_io *
302 ctl_alloc_beio(struct ctl_be_block_softc *softc)
304 struct ctl_be_block_io *beio;
306 beio = uma_zalloc(softc->beio_zone, M_WAITOK | M_ZERO);
312 ctl_free_beio(struct ctl_be_block_io *beio)
319 for (i = 0; i < beio->num_segs; i++) {
320 if (beio->sg_segs[i].addr == NULL)
323 uma_zfree(beio->lun->lun_zone, beio->sg_segs[i].addr);
324 beio->sg_segs[i].addr = NULL;
326 /* For compare we had two equal S/G lists. */
327 if (ARGS(beio->io)->flags & CTL_LLF_COMPARE) {
328 uma_zfree(beio->lun->lun_zone,
329 beio->sg_segs[i + CTLBLK_HALF_SEGS].addr);
330 beio->sg_segs[i + CTLBLK_HALF_SEGS].addr = NULL;
334 if (duplicate_free > 0) {
335 printf("%s: %d duplicate frees out of %d segments\n", __func__,
336 duplicate_free, beio->num_segs);
339 uma_zfree(beio->softc->beio_zone, beio);
343 ctl_complete_beio(struct ctl_be_block_io *beio)
345 union ctl_io *io = beio->io;
347 if (beio->beio_cont != NULL) {
348 beio->beio_cont(beio);
351 ctl_data_submit_done(io);
356 cmp(uint8_t *a, uint8_t *b, size_t size)
360 for (i = 0; i < size; i++) {
368 ctl_be_block_compare(union ctl_io *io)
370 struct ctl_be_block_io *beio;
375 beio = (struct ctl_be_block_io *)PRIV(io)->ptr;
377 for (i = 0; i < beio->num_segs; i++) {
378 res = cmp(beio->sg_segs[i].addr,
379 beio->sg_segs[i + CTLBLK_HALF_SEGS].addr,
380 beio->sg_segs[i].len);
382 if (res < beio->sg_segs[i].len)
385 if (i < beio->num_segs) {
386 scsi_u64to8b(off, info);
387 ctl_set_sense(&io->scsiio, /*current_error*/ 1,
388 /*sense_key*/ SSD_KEY_MISCOMPARE,
389 /*asc*/ 0x1D, /*ascq*/ 0x00,
390 /*type*/ SSD_ELEM_INFO,
391 /*size*/ sizeof(info), /*data*/ &info,
392 /*type*/ SSD_ELEM_NONE);
394 ctl_set_success(&io->scsiio);
398 ctl_be_block_move_done(union ctl_io *io)
400 struct ctl_be_block_io *beio;
401 struct ctl_be_block_lun *be_lun;
402 struct ctl_lba_len_flags *lbalen;
404 struct bintime cur_bt;
407 beio = (struct ctl_be_block_io *)PRIV(io)->ptr;
410 DPRINTF("entered\n");
413 getbinuptime(&cur_bt);
414 bintime_sub(&cur_bt, &io->io_hdr.dma_start_bt);
415 bintime_add(&io->io_hdr.dma_bt, &cur_bt);
417 io->io_hdr.num_dmas++;
418 io->scsiio.kern_rel_offset += io->scsiio.kern_data_len;
421 * We set status at this point for read commands, and write
422 * commands with errors.
424 if (io->io_hdr.flags & CTL_FLAG_ABORT) {
426 } else if ((io->io_hdr.port_status != 0) &&
427 ((io->io_hdr.status & CTL_STATUS_MASK) == CTL_STATUS_NONE ||
428 (io->io_hdr.status & CTL_STATUS_MASK) == CTL_SUCCESS)) {
429 ctl_set_internal_failure(&io->scsiio, /*sks_valid*/ 1,
430 /*retry_count*/ io->io_hdr.port_status);
431 } else if (io->scsiio.kern_data_resid != 0 &&
432 (io->io_hdr.flags & CTL_FLAG_DATA_MASK) == CTL_FLAG_DATA_OUT &&
433 ((io->io_hdr.status & CTL_STATUS_MASK) == CTL_STATUS_NONE ||
434 (io->io_hdr.status & CTL_STATUS_MASK) == CTL_SUCCESS)) {
435 ctl_set_invalid_field_ciu(&io->scsiio);
436 } else if ((io->io_hdr.port_status == 0) &&
437 ((io->io_hdr.status & CTL_STATUS_MASK) == CTL_STATUS_NONE)) {
438 lbalen = ARGS(beio->io);
439 if (lbalen->flags & CTL_LLF_READ) {
440 ctl_set_success(&io->scsiio);
441 } else if (lbalen->flags & CTL_LLF_COMPARE) {
442 /* We have two data blocks ready for comparison. */
443 ctl_be_block_compare(io);
448 * If this is a read, or a write with errors, it is done.
450 if ((beio->bio_cmd == BIO_READ)
451 || ((io->io_hdr.flags & CTL_FLAG_ABORT) != 0)
452 || ((io->io_hdr.status & CTL_STATUS_MASK) != CTL_STATUS_NONE)) {
453 ctl_complete_beio(beio);
458 * At this point, we have a write and the DMA completed
459 * successfully. We now have to queue it to the task queue to
460 * execute the backend I/O. That is because we do blocking
461 * memory allocations, and in the file backing case, blocking I/O.
462 * This move done routine is generally called in the SIM's
463 * interrupt context, and therefore we cannot block.
465 mtx_lock(&be_lun->queue_lock);
466 STAILQ_INSERT_TAIL(&be_lun->datamove_queue, &io->io_hdr, links);
467 mtx_unlock(&be_lun->queue_lock);
468 taskqueue_enqueue(be_lun->io_taskqueue, &be_lun->io_task);
474 ctl_be_block_biodone(struct bio *bio)
476 struct ctl_be_block_io *beio;
477 struct ctl_be_block_lun *be_lun;
481 beio = bio->bio_caller1;
485 DPRINTF("entered\n");
487 error = bio->bio_error;
488 mtx_lock(&be_lun->io_lock);
490 (beio->first_error == 0 ||
491 bio->bio_offset < beio->first_error_offset)) {
492 beio->first_error = error;
493 beio->first_error_offset = bio->bio_offset;
496 beio->num_bios_done++;
499 * XXX KDM will this cause WITNESS to complain? Holding a lock
500 * during the free might cause it to complain.
505 * If the send complete bit isn't set, or we aren't the last I/O to
506 * complete, then we're done.
508 if ((beio->send_complete == 0)
509 || (beio->num_bios_done < beio->num_bios_sent)) {
510 mtx_unlock(&be_lun->io_lock);
515 * At this point, we've verified that we are the last I/O to
516 * complete, so it's safe to drop the lock.
518 devstat_end_transaction(beio->lun->disk_stats, beio->io_len,
519 beio->ds_tag_type, beio->ds_trans_type,
520 /*now*/ NULL, /*then*/&beio->ds_t0);
521 mtx_unlock(&be_lun->io_lock);
524 * If there are any errors from the backing device, we fail the
525 * entire I/O with a medium error.
527 error = beio->first_error;
529 if (error == EOPNOTSUPP) {
530 ctl_set_invalid_opcode(&io->scsiio);
531 } else if (error == ENOSPC || error == EDQUOT) {
532 ctl_set_space_alloc_fail(&io->scsiio);
533 } else if (error == EROFS || error == EACCES) {
534 ctl_set_hw_write_protected(&io->scsiio);
535 } else if (beio->bio_cmd == BIO_FLUSH) {
536 /* XXX KDM is there is a better error here? */
537 ctl_set_internal_failure(&io->scsiio,
539 /*retry_count*/ 0xbad2);
541 ctl_set_medium_error(&io->scsiio,
542 beio->bio_cmd == BIO_READ);
544 ctl_complete_beio(beio);
549 * If this is a write, a flush, a delete or verify, we're all done.
550 * If this is a read, we can now send the data to the user.
552 if ((beio->bio_cmd == BIO_WRITE)
553 || (beio->bio_cmd == BIO_FLUSH)
554 || (beio->bio_cmd == BIO_DELETE)
555 || (ARGS(io)->flags & CTL_LLF_VERIFY)) {
556 ctl_set_success(&io->scsiio);
557 ctl_complete_beio(beio);
559 if ((ARGS(io)->flags & CTL_LLF_READ) &&
560 beio->beio_cont == NULL) {
561 ctl_set_success(&io->scsiio);
565 getbinuptime(&io->io_hdr.dma_start_bt);
572 ctl_be_block_flush_file(struct ctl_be_block_lun *be_lun,
573 struct ctl_be_block_io *beio)
575 union ctl_io *io = beio->io;
576 struct mount *mountpoint;
577 int error, lock_flags;
579 DPRINTF("entered\n");
581 binuptime(&beio->ds_t0);
582 mtx_lock(&be_lun->io_lock);
583 devstat_start_transaction(beio->lun->disk_stats, &beio->ds_t0);
584 mtx_unlock(&be_lun->io_lock);
586 (void) vn_start_write(be_lun->vn, &mountpoint, V_WAIT);
588 if (MNT_SHARED_WRITES(mountpoint) ||
589 ((mountpoint == NULL) && MNT_SHARED_WRITES(be_lun->vn->v_mount)))
590 lock_flags = LK_SHARED;
592 lock_flags = LK_EXCLUSIVE;
593 vn_lock(be_lun->vn, lock_flags | LK_RETRY);
594 error = VOP_FSYNC(be_lun->vn, beio->io_arg ? MNT_NOWAIT : MNT_WAIT,
596 VOP_UNLOCK(be_lun->vn, 0);
598 vn_finished_write(mountpoint);
600 mtx_lock(&be_lun->io_lock);
601 devstat_end_transaction(beio->lun->disk_stats, beio->io_len,
602 beio->ds_tag_type, beio->ds_trans_type,
603 /*now*/ NULL, /*then*/&beio->ds_t0);
604 mtx_unlock(&be_lun->io_lock);
607 ctl_set_success(&io->scsiio);
609 /* XXX KDM is there is a better error here? */
610 ctl_set_internal_failure(&io->scsiio,
612 /*retry_count*/ 0xbad1);
615 ctl_complete_beio(beio);
618 SDT_PROBE_DEFINE1(cbb, , read, file_start, "uint64_t");
619 SDT_PROBE_DEFINE1(cbb, , write, file_start, "uint64_t");
620 SDT_PROBE_DEFINE1(cbb, , read, file_done,"uint64_t");
621 SDT_PROBE_DEFINE1(cbb, , write, file_done, "uint64_t");
624 ctl_be_block_dispatch_file(struct ctl_be_block_lun *be_lun,
625 struct ctl_be_block_io *beio)
627 struct ctl_be_block_filedata *file_data;
630 struct iovec *xiovec;
634 DPRINTF("entered\n");
636 file_data = &be_lun->backend.file;
639 if (ARGS(io)->flags & CTL_LLF_DPO)
641 if (beio->bio_cmd == BIO_WRITE && ARGS(io)->flags & CTL_LLF_FUA)
644 bzero(&xuio, sizeof(xuio));
645 if (beio->bio_cmd == BIO_READ) {
646 SDT_PROBE0(cbb, , read, file_start);
647 xuio.uio_rw = UIO_READ;
649 SDT_PROBE0(cbb, , write, file_start);
650 xuio.uio_rw = UIO_WRITE;
652 xuio.uio_offset = beio->io_offset;
653 xuio.uio_resid = beio->io_len;
654 xuio.uio_segflg = UIO_SYSSPACE;
655 xuio.uio_iov = beio->xiovecs;
656 xuio.uio_iovcnt = beio->num_segs;
657 xuio.uio_td = curthread;
659 for (i = 0, xiovec = xuio.uio_iov; i < xuio.uio_iovcnt; i++, xiovec++) {
660 xiovec->iov_base = beio->sg_segs[i].addr;
661 xiovec->iov_len = beio->sg_segs[i].len;
664 binuptime(&beio->ds_t0);
665 mtx_lock(&be_lun->io_lock);
666 devstat_start_transaction(beio->lun->disk_stats, &beio->ds_t0);
667 mtx_unlock(&be_lun->io_lock);
669 if (beio->bio_cmd == BIO_READ) {
670 vn_lock(be_lun->vn, LK_SHARED | LK_RETRY);
673 * UFS pays attention to IO_DIRECT for reads. If the
674 * DIRECTIO option is configured into the kernel, it calls
675 * ffs_rawread(). But that only works for single-segment
676 * uios with user space addresses. In our case, with a
677 * kernel uio, it still reads into the buffer cache, but it
678 * will just try to release the buffer from the cache later
681 * ZFS does not pay attention to IO_DIRECT for reads.
683 * UFS does not pay attention to IO_SYNC for reads.
685 * ZFS pays attention to IO_SYNC (which translates into the
686 * Solaris define FRSYNC for zfs_read()) for reads. It
687 * attempts to sync the file before reading.
689 error = VOP_READ(be_lun->vn, &xuio, flags, file_data->cred);
691 VOP_UNLOCK(be_lun->vn, 0);
692 SDT_PROBE0(cbb, , read, file_done);
693 if (error == 0 && xuio.uio_resid > 0) {
695 * If we red less then requested (EOF), then
696 * we should clean the rest of the buffer.
698 s = beio->io_len - xuio.uio_resid;
699 for (i = 0; i < beio->num_segs; i++) {
700 if (s >= beio->sg_segs[i].len) {
701 s -= beio->sg_segs[i].len;
704 bzero((uint8_t *)beio->sg_segs[i].addr + s,
705 beio->sg_segs[i].len - s);
710 struct mount *mountpoint;
713 (void)vn_start_write(be_lun->vn, &mountpoint, V_WAIT);
715 if (MNT_SHARED_WRITES(mountpoint) || ((mountpoint == NULL)
716 && MNT_SHARED_WRITES(be_lun->vn->v_mount)))
717 lock_flags = LK_SHARED;
719 lock_flags = LK_EXCLUSIVE;
720 vn_lock(be_lun->vn, lock_flags | LK_RETRY);
723 * UFS pays attention to IO_DIRECT for writes. The write
724 * is done asynchronously. (Normally the write would just
725 * get put into cache.
727 * UFS pays attention to IO_SYNC for writes. It will
728 * attempt to write the buffer out synchronously if that
731 * ZFS does not pay attention to IO_DIRECT for writes.
733 * ZFS pays attention to IO_SYNC (a.k.a. FSYNC or FRSYNC)
734 * for writes. It will flush the transaction from the
735 * cache before returning.
737 error = VOP_WRITE(be_lun->vn, &xuio, flags, file_data->cred);
738 VOP_UNLOCK(be_lun->vn, 0);
740 vn_finished_write(mountpoint);
741 SDT_PROBE0(cbb, , write, file_done);
744 mtx_lock(&be_lun->io_lock);
745 devstat_end_transaction(beio->lun->disk_stats, beio->io_len,
746 beio->ds_tag_type, beio->ds_trans_type,
747 /*now*/ NULL, /*then*/&beio->ds_t0);
748 mtx_unlock(&be_lun->io_lock);
751 * If we got an error, set the sense data to "MEDIUM ERROR" and
752 * return the I/O to the user.
755 if (error == ENOSPC || error == EDQUOT) {
756 ctl_set_space_alloc_fail(&io->scsiio);
757 } else if (error == EROFS || error == EACCES) {
758 ctl_set_hw_write_protected(&io->scsiio);
760 ctl_set_medium_error(&io->scsiio,
761 beio->bio_cmd == BIO_READ);
763 ctl_complete_beio(beio);
768 * If this is a write or a verify, we're all done.
769 * If this is a read, we can now send the data to the user.
771 if ((beio->bio_cmd == BIO_WRITE) ||
772 (ARGS(io)->flags & CTL_LLF_VERIFY)) {
773 ctl_set_success(&io->scsiio);
774 ctl_complete_beio(beio);
776 if ((ARGS(io)->flags & CTL_LLF_READ) &&
777 beio->beio_cont == NULL) {
778 ctl_set_success(&io->scsiio);
782 getbinuptime(&io->io_hdr.dma_start_bt);
789 ctl_be_block_gls_file(struct ctl_be_block_lun *be_lun,
790 struct ctl_be_block_io *beio)
792 union ctl_io *io = beio->io;
793 struct ctl_lba_len_flags *lbalen = ARGS(io);
794 struct scsi_get_lba_status_data *data;
798 DPRINTF("entered\n");
800 off = roff = ((off_t)lbalen->lba) * be_lun->cbe_lun.blocksize;
801 vn_lock(be_lun->vn, LK_SHARED | LK_RETRY);
802 error = VOP_IOCTL(be_lun->vn, FIOSEEKHOLE, &off,
803 0, curthread->td_ucred, curthread);
804 if (error == 0 && off > roff)
805 status = 0; /* mapped up to off */
807 error = VOP_IOCTL(be_lun->vn, FIOSEEKDATA, &off,
808 0, curthread->td_ucred, curthread);
809 if (error == 0 && off > roff)
810 status = 1; /* deallocated up to off */
812 status = 0; /* unknown up to the end */
813 off = be_lun->size_bytes;
816 VOP_UNLOCK(be_lun->vn, 0);
818 data = (struct scsi_get_lba_status_data *)io->scsiio.kern_data_ptr;
819 scsi_u64to8b(lbalen->lba, data->descr[0].addr);
820 scsi_ulto4b(MIN(UINT32_MAX, off / be_lun->cbe_lun.blocksize -
821 lbalen->lba), data->descr[0].length);
822 data->descr[0].status = status;
824 ctl_complete_beio(beio);
828 ctl_be_block_getattr_file(struct ctl_be_block_lun *be_lun, const char *attrname)
831 struct statfs statfs;
836 if (be_lun->vn == NULL)
838 vn_lock(be_lun->vn, LK_SHARED | LK_RETRY);
839 if (strcmp(attrname, "blocksused") == 0) {
840 error = VOP_GETATTR(be_lun->vn, &vattr, curthread->td_ucred);
842 val = vattr.va_bytes / be_lun->cbe_lun.blocksize;
844 if (strcmp(attrname, "blocksavail") == 0 &&
845 (be_lun->vn->v_iflag & VI_DOOMED) == 0) {
846 error = VFS_STATFS(be_lun->vn->v_mount, &statfs);
848 val = statfs.f_bavail * statfs.f_bsize /
849 be_lun->cbe_lun.blocksize;
851 VOP_UNLOCK(be_lun->vn, 0);
856 ctl_be_block_dispatch_zvol(struct ctl_be_block_lun *be_lun,
857 struct ctl_be_block_io *beio)
863 struct iovec *xiovec;
864 int error, flags, i, ref;
866 DPRINTF("entered\n");
870 if (ARGS(io)->flags & CTL_LLF_DPO)
872 if (beio->bio_cmd == BIO_WRITE && ARGS(io)->flags & CTL_LLF_FUA)
875 bzero(&xuio, sizeof(xuio));
876 if (beio->bio_cmd == BIO_READ) {
877 SDT_PROBE0(cbb, , read, file_start);
878 xuio.uio_rw = UIO_READ;
880 SDT_PROBE0(cbb, , write, file_start);
881 xuio.uio_rw = UIO_WRITE;
883 xuio.uio_offset = beio->io_offset;
884 xuio.uio_resid = beio->io_len;
885 xuio.uio_segflg = UIO_SYSSPACE;
886 xuio.uio_iov = beio->xiovecs;
887 xuio.uio_iovcnt = beio->num_segs;
888 xuio.uio_td = curthread;
890 for (i = 0, xiovec = xuio.uio_iov; i < xuio.uio_iovcnt; i++, xiovec++) {
891 xiovec->iov_base = beio->sg_segs[i].addr;
892 xiovec->iov_len = beio->sg_segs[i].len;
895 binuptime(&beio->ds_t0);
896 mtx_lock(&be_lun->io_lock);
897 devstat_start_transaction(beio->lun->disk_stats, &beio->ds_t0);
898 mtx_unlock(&be_lun->io_lock);
900 csw = devvn_refthread(be_lun->vn, &dev, &ref);
902 if (beio->bio_cmd == BIO_READ)
903 error = csw->d_read(dev, &xuio, flags);
905 error = csw->d_write(dev, &xuio, flags);
906 dev_relthread(dev, ref);
910 if (beio->bio_cmd == BIO_READ)
911 SDT_PROBE0(cbb, , read, file_done);
913 SDT_PROBE0(cbb, , write, file_done);
915 mtx_lock(&be_lun->io_lock);
916 devstat_end_transaction(beio->lun->disk_stats, beio->io_len,
917 beio->ds_tag_type, beio->ds_trans_type,
918 /*now*/ NULL, /*then*/&beio->ds_t0);
919 mtx_unlock(&be_lun->io_lock);
922 * If we got an error, set the sense data to "MEDIUM ERROR" and
923 * return the I/O to the user.
926 if (error == ENOSPC || error == EDQUOT) {
927 ctl_set_space_alloc_fail(&io->scsiio);
928 } else if (error == EROFS || error == EACCES) {
929 ctl_set_hw_write_protected(&io->scsiio);
931 ctl_set_medium_error(&io->scsiio,
932 beio->bio_cmd == BIO_READ);
934 ctl_complete_beio(beio);
939 * If this is a write or a verify, we're all done.
940 * If this is a read, we can now send the data to the user.
942 if ((beio->bio_cmd == BIO_WRITE) ||
943 (ARGS(io)->flags & CTL_LLF_VERIFY)) {
944 ctl_set_success(&io->scsiio);
945 ctl_complete_beio(beio);
947 if ((ARGS(io)->flags & CTL_LLF_READ) &&
948 beio->beio_cont == NULL) {
949 ctl_set_success(&io->scsiio);
953 getbinuptime(&io->io_hdr.dma_start_bt);
960 ctl_be_block_gls_zvol(struct ctl_be_block_lun *be_lun,
961 struct ctl_be_block_io *beio)
963 union ctl_io *io = beio->io;
966 struct ctl_lba_len_flags *lbalen = ARGS(io);
967 struct scsi_get_lba_status_data *data;
969 int error, ref, status;
971 DPRINTF("entered\n");
973 csw = devvn_refthread(be_lun->vn, &dev, &ref);
975 status = 0; /* unknown up to the end */
976 off = be_lun->size_bytes;
979 off = roff = ((off_t)lbalen->lba) * be_lun->cbe_lun.blocksize;
980 error = csw->d_ioctl(dev, FIOSEEKHOLE, (caddr_t)&off, FREAD,
982 if (error == 0 && off > roff)
983 status = 0; /* mapped up to off */
985 error = csw->d_ioctl(dev, FIOSEEKDATA, (caddr_t)&off, FREAD,
987 if (error == 0 && off > roff)
988 status = 1; /* deallocated up to off */
990 status = 0; /* unknown up to the end */
991 off = be_lun->size_bytes;
994 dev_relthread(dev, ref);
997 data = (struct scsi_get_lba_status_data *)io->scsiio.kern_data_ptr;
998 scsi_u64to8b(lbalen->lba, data->descr[0].addr);
999 scsi_ulto4b(MIN(UINT32_MAX, off / be_lun->cbe_lun.blocksize -
1000 lbalen->lba), data->descr[0].length);
1001 data->descr[0].status = status;
1003 ctl_complete_beio(beio);
1007 ctl_be_block_flush_dev(struct ctl_be_block_lun *be_lun,
1008 struct ctl_be_block_io *beio)
1015 DPRINTF("entered\n");
1017 /* This can't fail, it's a blocking allocation. */
1018 bio = g_alloc_bio();
1020 bio->bio_cmd = BIO_FLUSH;
1021 bio->bio_offset = 0;
1023 bio->bio_done = ctl_be_block_biodone;
1024 bio->bio_caller1 = beio;
1025 bio->bio_pblkno = 0;
1028 * We don't need to acquire the LUN lock here, because we are only
1029 * sending one bio, and so there is no other context to synchronize
1032 beio->num_bios_sent = 1;
1033 beio->send_complete = 1;
1035 binuptime(&beio->ds_t0);
1036 mtx_lock(&be_lun->io_lock);
1037 devstat_start_transaction(be_lun->disk_stats, &beio->ds_t0);
1038 mtx_unlock(&be_lun->io_lock);
1040 csw = devvn_refthread(be_lun->vn, &dev, &ref);
1043 csw->d_strategy(bio);
1044 dev_relthread(dev, ref);
1046 bio->bio_error = ENXIO;
1047 ctl_be_block_biodone(bio);
1052 ctl_be_block_unmap_dev_range(struct ctl_be_block_lun *be_lun,
1053 struct ctl_be_block_io *beio,
1054 uint64_t off, uint64_t len, int last)
1062 csw = devvn_refthread(be_lun->vn, &dev, &ref);
1063 maxlen = LONG_MAX - (LONG_MAX % be_lun->cbe_lun.blocksize);
1065 bio = g_alloc_bio();
1066 bio->bio_cmd = BIO_DELETE;
1068 bio->bio_offset = off;
1069 bio->bio_length = MIN(len, maxlen);
1071 bio->bio_done = ctl_be_block_biodone;
1072 bio->bio_caller1 = beio;
1073 bio->bio_pblkno = off / be_lun->cbe_lun.blocksize;
1075 off += bio->bio_length;
1076 len -= bio->bio_length;
1078 mtx_lock(&be_lun->io_lock);
1079 beio->num_bios_sent++;
1080 if (last && len == 0)
1081 beio->send_complete = 1;
1082 mtx_unlock(&be_lun->io_lock);
1085 csw->d_strategy(bio);
1087 bio->bio_error = ENXIO;
1088 ctl_be_block_biodone(bio);
1092 dev_relthread(dev, ref);
1096 ctl_be_block_unmap_dev(struct ctl_be_block_lun *be_lun,
1097 struct ctl_be_block_io *beio)
1100 struct ctl_ptr_len_flags *ptrlen;
1101 struct scsi_unmap_desc *buf, *end;
1106 DPRINTF("entered\n");
1108 binuptime(&beio->ds_t0);
1109 mtx_lock(&be_lun->io_lock);
1110 devstat_start_transaction(be_lun->disk_stats, &beio->ds_t0);
1111 mtx_unlock(&be_lun->io_lock);
1113 if (beio->io_offset == -1) {
1115 ptrlen = (struct ctl_ptr_len_flags *)&io->io_hdr.ctl_private[CTL_PRIV_LBA_LEN];
1116 buf = (struct scsi_unmap_desc *)ptrlen->ptr;
1117 end = buf + ptrlen->len / sizeof(*buf);
1118 for (; buf < end; buf++) {
1119 len = (uint64_t)scsi_4btoul(buf->length) *
1120 be_lun->cbe_lun.blocksize;
1121 beio->io_len += len;
1122 ctl_be_block_unmap_dev_range(be_lun, beio,
1123 scsi_8btou64(buf->lba) * be_lun->cbe_lun.blocksize,
1124 len, (end - buf < 2) ? TRUE : FALSE);
1127 ctl_be_block_unmap_dev_range(be_lun, beio,
1128 beio->io_offset, beio->io_len, TRUE);
1132 ctl_be_block_dispatch_dev(struct ctl_be_block_lun *be_lun,
1133 struct ctl_be_block_io *beio)
1135 TAILQ_HEAD(, bio) queue = TAILQ_HEAD_INITIALIZER(queue);
1140 int i, max_iosize, ref;
1142 DPRINTF("entered\n");
1143 csw = devvn_refthread(be_lun->vn, &dev, &ref);
1146 * We have to limit our I/O size to the maximum supported by the
1147 * backend device. Hopefully it is MAXPHYS. If the driver doesn't
1148 * set it properly, use DFLTPHYS.
1151 max_iosize = dev->si_iosize_max;
1152 if (max_iosize < PAGE_SIZE)
1153 max_iosize = DFLTPHYS;
1155 max_iosize = DFLTPHYS;
1157 cur_offset = beio->io_offset;
1158 for (i = 0; i < beio->num_segs; i++) {
1162 cur_size = beio->sg_segs[i].len;
1163 cur_ptr = beio->sg_segs[i].addr;
1165 while (cur_size > 0) {
1166 /* This can't fail, it's a blocking allocation. */
1167 bio = g_alloc_bio();
1169 KASSERT(bio != NULL, ("g_alloc_bio() failed!\n"));
1171 bio->bio_cmd = beio->bio_cmd;
1173 bio->bio_caller1 = beio;
1174 bio->bio_length = min(cur_size, max_iosize);
1175 bio->bio_offset = cur_offset;
1176 bio->bio_data = cur_ptr;
1177 bio->bio_done = ctl_be_block_biodone;
1178 bio->bio_pblkno = cur_offset / be_lun->cbe_lun.blocksize;
1180 cur_offset += bio->bio_length;
1181 cur_ptr += bio->bio_length;
1182 cur_size -= bio->bio_length;
1184 TAILQ_INSERT_TAIL(&queue, bio, bio_queue);
1185 beio->num_bios_sent++;
1188 binuptime(&beio->ds_t0);
1189 mtx_lock(&be_lun->io_lock);
1190 devstat_start_transaction(be_lun->disk_stats, &beio->ds_t0);
1191 beio->send_complete = 1;
1192 mtx_unlock(&be_lun->io_lock);
1195 * Fire off all allocated requests!
1197 while ((bio = TAILQ_FIRST(&queue)) != NULL) {
1198 TAILQ_REMOVE(&queue, bio, bio_queue);
1200 csw->d_strategy(bio);
1202 bio->bio_error = ENXIO;
1203 ctl_be_block_biodone(bio);
1207 dev_relthread(dev, ref);
1211 ctl_be_block_getattr_dev(struct ctl_be_block_lun *be_lun, const char *attrname)
1213 struct diocgattr_arg arg;
1218 csw = devvn_refthread(be_lun->vn, &dev, &ref);
1220 return (UINT64_MAX);
1221 strlcpy(arg.name, attrname, sizeof(arg.name));
1222 arg.len = sizeof(arg.value.off);
1224 error = csw->d_ioctl(dev, DIOCGATTR, (caddr_t)&arg, FREAD,
1228 dev_relthread(dev, ref);
1230 return (UINT64_MAX);
1231 return (arg.value.off);
1235 ctl_be_block_cw_dispatch_sync(struct ctl_be_block_lun *be_lun,
1238 struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun;
1239 struct ctl_be_block_io *beio;
1240 struct ctl_lba_len_flags *lbalen;
1242 DPRINTF("entered\n");
1243 beio = (struct ctl_be_block_io *)PRIV(io)->ptr;
1244 lbalen = (struct ctl_lba_len_flags *)&io->io_hdr.ctl_private[CTL_PRIV_LBA_LEN];
1246 beio->io_len = lbalen->len * cbe_lun->blocksize;
1247 beio->io_offset = lbalen->lba * cbe_lun->blocksize;
1248 beio->io_arg = (lbalen->flags & SSC_IMMED) != 0;
1249 beio->bio_cmd = BIO_FLUSH;
1250 beio->ds_trans_type = DEVSTAT_NO_DATA;
1252 be_lun->lun_flush(be_lun, beio);
1256 ctl_be_block_cw_done_ws(struct ctl_be_block_io *beio)
1261 ctl_free_beio(beio);
1262 if ((io->io_hdr.flags & CTL_FLAG_ABORT) ||
1263 ((io->io_hdr.status & CTL_STATUS_MASK) != CTL_STATUS_NONE &&
1264 (io->io_hdr.status & CTL_STATUS_MASK) != CTL_SUCCESS)) {
1265 ctl_config_write_done(io);
1269 ctl_be_block_config_write(io);
1273 ctl_be_block_cw_dispatch_ws(struct ctl_be_block_lun *be_lun,
1276 struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun;
1277 struct ctl_be_block_io *beio;
1278 struct ctl_lba_len_flags *lbalen;
1279 uint64_t len_left, lba;
1280 uint32_t pb, pbo, adj;
1284 DPRINTF("entered\n");
1286 beio = (struct ctl_be_block_io *)PRIV(io)->ptr;
1287 lbalen = ARGS(beio->io);
1289 if (lbalen->flags & ~(SWS_LBDATA | SWS_UNMAP | SWS_ANCHOR | SWS_NDOB) ||
1290 (lbalen->flags & (SWS_UNMAP | SWS_ANCHOR) && be_lun->unmap == NULL)) {
1291 ctl_free_beio(beio);
1292 ctl_set_invalid_field(&io->scsiio,
1298 ctl_config_write_done(io);
1302 if (lbalen->flags & (SWS_UNMAP | SWS_ANCHOR)) {
1303 beio->io_offset = lbalen->lba * cbe_lun->blocksize;
1304 beio->io_len = (uint64_t)lbalen->len * cbe_lun->blocksize;
1305 beio->bio_cmd = BIO_DELETE;
1306 beio->ds_trans_type = DEVSTAT_FREE;
1308 be_lun->unmap(be_lun, beio);
1312 beio->bio_cmd = BIO_WRITE;
1313 beio->ds_trans_type = DEVSTAT_WRITE;
1315 DPRINTF("WRITE SAME at LBA %jx len %u\n",
1316 (uintmax_t)lbalen->lba, lbalen->len);
1318 pb = cbe_lun->blocksize << be_lun->cbe_lun.pblockexp;
1319 if (be_lun->cbe_lun.pblockoff > 0)
1320 pbo = pb - cbe_lun->blocksize * be_lun->cbe_lun.pblockoff;
1323 len_left = (uint64_t)lbalen->len * cbe_lun->blocksize;
1324 for (i = 0, lba = 0; i < CTLBLK_MAX_SEGS && len_left > 0; i++) {
1327 * Setup the S/G entry for this chunk.
1329 seglen = MIN(CTLBLK_MAX_SEG, len_left);
1330 if (pb > cbe_lun->blocksize) {
1331 adj = ((lbalen->lba + lba) * cbe_lun->blocksize +
1336 seglen -= seglen % cbe_lun->blocksize;
1338 seglen -= seglen % cbe_lun->blocksize;
1339 beio->sg_segs[i].len = seglen;
1340 beio->sg_segs[i].addr = uma_zalloc(be_lun->lun_zone, M_WAITOK);
1342 DPRINTF("segment %d addr %p len %zd\n", i,
1343 beio->sg_segs[i].addr, beio->sg_segs[i].len);
1348 buf = beio->sg_segs[i].addr;
1350 for (; buf < end; buf += cbe_lun->blocksize) {
1351 if (lbalen->flags & SWS_NDOB) {
1352 memset(buf, 0, cbe_lun->blocksize);
1354 memcpy(buf, io->scsiio.kern_data_ptr,
1355 cbe_lun->blocksize);
1357 if (lbalen->flags & SWS_LBDATA)
1358 scsi_ulto4b(lbalen->lba + lba, buf);
1363 beio->io_offset = lbalen->lba * cbe_lun->blocksize;
1364 beio->io_len = lba * cbe_lun->blocksize;
1366 /* We can not do all in one run. Correct and schedule rerun. */
1370 beio->beio_cont = ctl_be_block_cw_done_ws;
1373 be_lun->dispatch(be_lun, beio);
1377 ctl_be_block_cw_dispatch_unmap(struct ctl_be_block_lun *be_lun,
1380 struct ctl_be_block_io *beio;
1381 struct ctl_ptr_len_flags *ptrlen;
1383 DPRINTF("entered\n");
1385 beio = (struct ctl_be_block_io *)PRIV(io)->ptr;
1386 ptrlen = (struct ctl_ptr_len_flags *)&io->io_hdr.ctl_private[CTL_PRIV_LBA_LEN];
1388 if ((ptrlen->flags & ~SU_ANCHOR) != 0 || be_lun->unmap == NULL) {
1389 ctl_free_beio(beio);
1390 ctl_set_invalid_field(&io->scsiio,
1396 ctl_config_write_done(io);
1401 beio->io_offset = -1;
1402 beio->bio_cmd = BIO_DELETE;
1403 beio->ds_trans_type = DEVSTAT_FREE;
1405 be_lun->unmap(be_lun, beio);
1409 ctl_be_block_cr_done(struct ctl_be_block_io *beio)
1414 ctl_free_beio(beio);
1415 ctl_config_read_done(io);
1419 ctl_be_block_cr_dispatch(struct ctl_be_block_lun *be_lun,
1422 struct ctl_be_block_io *beio;
1423 struct ctl_be_block_softc *softc;
1425 DPRINTF("entered\n");
1427 softc = be_lun->softc;
1428 beio = ctl_alloc_beio(softc);
1431 beio->beio_cont = ctl_be_block_cr_done;
1432 PRIV(io)->ptr = (void *)beio;
1434 switch (io->scsiio.cdb[0]) {
1435 case SERVICE_ACTION_IN: /* GET LBA STATUS */
1437 beio->ds_trans_type = DEVSTAT_NO_DATA;
1438 beio->ds_tag_type = DEVSTAT_TAG_ORDERED;
1440 if (be_lun->get_lba_status)
1441 be_lun->get_lba_status(be_lun, beio);
1443 ctl_be_block_cr_done(beio);
1446 panic("Unhandled CDB type %#x", io->scsiio.cdb[0]);
1452 ctl_be_block_cw_done(struct ctl_be_block_io *beio)
1457 ctl_free_beio(beio);
1458 ctl_config_write_done(io);
1462 ctl_be_block_cw_dispatch(struct ctl_be_block_lun *be_lun,
1465 struct ctl_be_block_io *beio;
1466 struct ctl_be_block_softc *softc;
1468 DPRINTF("entered\n");
1470 softc = be_lun->softc;
1471 beio = ctl_alloc_beio(softc);
1474 beio->beio_cont = ctl_be_block_cw_done;
1475 switch (io->scsiio.tag_type) {
1476 case CTL_TAG_ORDERED:
1477 beio->ds_tag_type = DEVSTAT_TAG_ORDERED;
1479 case CTL_TAG_HEAD_OF_QUEUE:
1480 beio->ds_tag_type = DEVSTAT_TAG_HEAD;
1482 case CTL_TAG_UNTAGGED:
1483 case CTL_TAG_SIMPLE:
1486 beio->ds_tag_type = DEVSTAT_TAG_SIMPLE;
1489 PRIV(io)->ptr = (void *)beio;
1491 switch (io->scsiio.cdb[0]) {
1492 case SYNCHRONIZE_CACHE:
1493 case SYNCHRONIZE_CACHE_16:
1494 ctl_be_block_cw_dispatch_sync(be_lun, io);
1498 ctl_be_block_cw_dispatch_ws(be_lun, io);
1501 ctl_be_block_cw_dispatch_unmap(be_lun, io);
1504 panic("Unhandled CDB type %#x", io->scsiio.cdb[0]);
1509 SDT_PROBE_DEFINE1(cbb, , read, start, "uint64_t");
1510 SDT_PROBE_DEFINE1(cbb, , write, start, "uint64_t");
1511 SDT_PROBE_DEFINE1(cbb, , read, alloc_done, "uint64_t");
1512 SDT_PROBE_DEFINE1(cbb, , write, alloc_done, "uint64_t");
1515 ctl_be_block_next(struct ctl_be_block_io *beio)
1517 struct ctl_be_block_lun *be_lun;
1522 ctl_free_beio(beio);
1523 if ((io->io_hdr.flags & CTL_FLAG_ABORT) ||
1524 ((io->io_hdr.status & CTL_STATUS_MASK) != CTL_STATUS_NONE &&
1525 (io->io_hdr.status & CTL_STATUS_MASK) != CTL_SUCCESS)) {
1526 ctl_data_submit_done(io);
1530 io->io_hdr.status &= ~CTL_STATUS_MASK;
1531 io->io_hdr.status |= CTL_STATUS_NONE;
1533 mtx_lock(&be_lun->queue_lock);
1534 STAILQ_INSERT_TAIL(&be_lun->input_queue, &io->io_hdr, links);
1535 mtx_unlock(&be_lun->queue_lock);
1536 taskqueue_enqueue(be_lun->io_taskqueue, &be_lun->io_task);
1540 ctl_be_block_dispatch(struct ctl_be_block_lun *be_lun,
1543 struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun;
1544 struct ctl_be_block_io *beio;
1545 struct ctl_be_block_softc *softc;
1546 struct ctl_lba_len_flags *lbalen;
1547 struct ctl_ptr_len_flags *bptrlen;
1548 uint64_t len_left, lbas;
1551 softc = be_lun->softc;
1553 DPRINTF("entered\n");
1556 if (lbalen->flags & CTL_LLF_WRITE) {
1557 SDT_PROBE0(cbb, , write, start);
1559 SDT_PROBE0(cbb, , read, start);
1562 beio = ctl_alloc_beio(softc);
1566 bptrlen->ptr = (void *)beio;
1568 switch (io->scsiio.tag_type) {
1569 case CTL_TAG_ORDERED:
1570 beio->ds_tag_type = DEVSTAT_TAG_ORDERED;
1572 case CTL_TAG_HEAD_OF_QUEUE:
1573 beio->ds_tag_type = DEVSTAT_TAG_HEAD;
1575 case CTL_TAG_UNTAGGED:
1576 case CTL_TAG_SIMPLE:
1579 beio->ds_tag_type = DEVSTAT_TAG_SIMPLE;
1583 if (lbalen->flags & CTL_LLF_WRITE) {
1584 beio->bio_cmd = BIO_WRITE;
1585 beio->ds_trans_type = DEVSTAT_WRITE;
1587 beio->bio_cmd = BIO_READ;
1588 beio->ds_trans_type = DEVSTAT_READ;
1591 DPRINTF("%s at LBA %jx len %u @%ju\n",
1592 (beio->bio_cmd == BIO_READ) ? "READ" : "WRITE",
1593 (uintmax_t)lbalen->lba, lbalen->len, bptrlen->len);
1594 if (lbalen->flags & CTL_LLF_COMPARE)
1595 lbas = CTLBLK_HALF_IO_SIZE;
1597 lbas = CTLBLK_MAX_IO_SIZE;
1598 lbas = MIN(lbalen->len - bptrlen->len, lbas / cbe_lun->blocksize);
1599 beio->io_offset = (lbalen->lba + bptrlen->len) * cbe_lun->blocksize;
1600 beio->io_len = lbas * cbe_lun->blocksize;
1601 bptrlen->len += lbas;
1603 for (i = 0, len_left = beio->io_len; len_left > 0; i++) {
1604 KASSERT(i < CTLBLK_MAX_SEGS, ("Too many segs (%d >= %d)",
1605 i, CTLBLK_MAX_SEGS));
1608 * Setup the S/G entry for this chunk.
1610 beio->sg_segs[i].len = min(CTLBLK_MAX_SEG, len_left);
1611 beio->sg_segs[i].addr = uma_zalloc(be_lun->lun_zone, M_WAITOK);
1613 DPRINTF("segment %d addr %p len %zd\n", i,
1614 beio->sg_segs[i].addr, beio->sg_segs[i].len);
1616 /* Set up second segment for compare operation. */
1617 if (lbalen->flags & CTL_LLF_COMPARE) {
1618 beio->sg_segs[i + CTLBLK_HALF_SEGS].len =
1619 beio->sg_segs[i].len;
1620 beio->sg_segs[i + CTLBLK_HALF_SEGS].addr =
1621 uma_zalloc(be_lun->lun_zone, M_WAITOK);
1625 len_left -= beio->sg_segs[i].len;
1627 if (bptrlen->len < lbalen->len)
1628 beio->beio_cont = ctl_be_block_next;
1629 io->scsiio.be_move_done = ctl_be_block_move_done;
1630 /* For compare we have separate S/G lists for read and datamove. */
1631 if (lbalen->flags & CTL_LLF_COMPARE)
1632 io->scsiio.kern_data_ptr = (uint8_t *)&beio->sg_segs[CTLBLK_HALF_SEGS];
1634 io->scsiio.kern_data_ptr = (uint8_t *)beio->sg_segs;
1635 io->scsiio.kern_data_len = beio->io_len;
1636 io->scsiio.kern_sg_entries = beio->num_segs;
1637 io->io_hdr.flags |= CTL_FLAG_ALLOCATED;
1640 * For the read case, we need to read the data into our buffers and
1641 * then we can send it back to the user. For the write case, we
1642 * need to get the data from the user first.
1644 if (beio->bio_cmd == BIO_READ) {
1645 SDT_PROBE0(cbb, , read, alloc_done);
1646 be_lun->dispatch(be_lun, beio);
1648 SDT_PROBE0(cbb, , write, alloc_done);
1650 getbinuptime(&io->io_hdr.dma_start_bt);
1657 ctl_be_block_worker(void *context, int pending)
1659 struct ctl_be_block_lun *be_lun = (struct ctl_be_block_lun *)context;
1660 struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun;
1662 struct ctl_be_block_io *beio;
1664 DPRINTF("entered\n");
1666 * Fetch and process I/Os from all queues. If we detect LUN
1667 * CTL_LUN_FLAG_NO_MEDIA status here -- it is result of a race,
1668 * so make response maximally opaque to not confuse initiator.
1671 mtx_lock(&be_lun->queue_lock);
1672 io = (union ctl_io *)STAILQ_FIRST(&be_lun->datamove_queue);
1674 DPRINTF("datamove queue\n");
1675 STAILQ_REMOVE(&be_lun->datamove_queue, &io->io_hdr,
1677 mtx_unlock(&be_lun->queue_lock);
1678 beio = (struct ctl_be_block_io *)PRIV(io)->ptr;
1679 if (cbe_lun->flags & CTL_LUN_FLAG_NO_MEDIA) {
1680 ctl_set_busy(&io->scsiio);
1681 ctl_complete_beio(beio);
1684 be_lun->dispatch(be_lun, beio);
1687 io = (union ctl_io *)STAILQ_FIRST(&be_lun->config_write_queue);
1689 DPRINTF("config write queue\n");
1690 STAILQ_REMOVE(&be_lun->config_write_queue, &io->io_hdr,
1692 mtx_unlock(&be_lun->queue_lock);
1693 if (cbe_lun->flags & CTL_LUN_FLAG_NO_MEDIA) {
1694 ctl_set_busy(&io->scsiio);
1695 ctl_config_write_done(io);
1698 ctl_be_block_cw_dispatch(be_lun, io);
1701 io = (union ctl_io *)STAILQ_FIRST(&be_lun->config_read_queue);
1703 DPRINTF("config read queue\n");
1704 STAILQ_REMOVE(&be_lun->config_read_queue, &io->io_hdr,
1706 mtx_unlock(&be_lun->queue_lock);
1707 if (cbe_lun->flags & CTL_LUN_FLAG_NO_MEDIA) {
1708 ctl_set_busy(&io->scsiio);
1709 ctl_config_read_done(io);
1712 ctl_be_block_cr_dispatch(be_lun, io);
1715 io = (union ctl_io *)STAILQ_FIRST(&be_lun->input_queue);
1717 DPRINTF("input queue\n");
1718 STAILQ_REMOVE(&be_lun->input_queue, &io->io_hdr,
1720 mtx_unlock(&be_lun->queue_lock);
1721 if (cbe_lun->flags & CTL_LUN_FLAG_NO_MEDIA) {
1722 ctl_set_busy(&io->scsiio);
1723 ctl_data_submit_done(io);
1726 ctl_be_block_dispatch(be_lun, io);
1731 * If we get here, there is no work left in the queues, so
1732 * just break out and let the task queue go to sleep.
1734 mtx_unlock(&be_lun->queue_lock);
1740 * Entry point from CTL to the backend for I/O. We queue everything to a
1741 * work thread, so this just puts the I/O on a queue and wakes up the
1745 ctl_be_block_submit(union ctl_io *io)
1747 struct ctl_be_block_lun *be_lun;
1748 struct ctl_be_lun *cbe_lun;
1750 DPRINTF("entered\n");
1752 cbe_lun = CTL_BACKEND_LUN(io);
1753 be_lun = (struct ctl_be_block_lun *)cbe_lun->be_lun;
1756 * Make sure we only get SCSI I/O.
1758 KASSERT(io->io_hdr.io_type == CTL_IO_SCSI, ("Non-SCSI I/O (type "
1759 "%#x) encountered", io->io_hdr.io_type));
1763 mtx_lock(&be_lun->queue_lock);
1764 STAILQ_INSERT_TAIL(&be_lun->input_queue, &io->io_hdr, links);
1765 mtx_unlock(&be_lun->queue_lock);
1766 taskqueue_enqueue(be_lun->io_taskqueue, &be_lun->io_task);
1768 return (CTL_RETVAL_COMPLETE);
1772 ctl_be_block_ioctl(struct cdev *dev, u_long cmd, caddr_t addr,
1773 int flag, struct thread *td)
1775 struct ctl_be_block_softc *softc;
1778 softc = &backend_block_softc;
1784 struct ctl_lun_req *lun_req;
1786 lun_req = (struct ctl_lun_req *)addr;
1788 switch (lun_req->reqtype) {
1789 case CTL_LUNREQ_CREATE:
1790 error = ctl_be_block_create(softc, lun_req);
1793 error = ctl_be_block_rm(softc, lun_req);
1795 case CTL_LUNREQ_MODIFY:
1796 error = ctl_be_block_modify(softc, lun_req);
1799 lun_req->status = CTL_LUN_ERROR;
1800 snprintf(lun_req->error_str, sizeof(lun_req->error_str),
1801 "invalid LUN request type %d",
1816 ctl_be_block_open_file(struct ctl_be_block_lun *be_lun, struct ctl_lun_req *req)
1818 struct ctl_be_lun *cbe_lun;
1819 struct ctl_be_block_filedata *file_data;
1820 struct ctl_lun_create_params *params;
1823 off_t ps, pss, po, pos, us, uss, uo, uos;
1826 cbe_lun = &be_lun->cbe_lun;
1827 file_data = &be_lun->backend.file;
1828 params = &be_lun->params;
1830 be_lun->dev_type = CTL_BE_BLOCK_FILE;
1831 be_lun->dispatch = ctl_be_block_dispatch_file;
1832 be_lun->lun_flush = ctl_be_block_flush_file;
1833 be_lun->get_lba_status = ctl_be_block_gls_file;
1834 be_lun->getattr = ctl_be_block_getattr_file;
1835 be_lun->unmap = NULL;
1836 cbe_lun->flags &= ~CTL_LUN_FLAG_UNMAP;
1838 error = VOP_GETATTR(be_lun->vn, &vattr, curthread->td_ucred);
1840 snprintf(req->error_str, sizeof(req->error_str),
1841 "error calling VOP_GETATTR() for file %s",
1846 file_data->cred = crhold(curthread->td_ucred);
1847 if (params->lun_size_bytes != 0)
1848 be_lun->size_bytes = params->lun_size_bytes;
1850 be_lun->size_bytes = vattr.va_size;
1853 * For files we can use any logical block size. Prefer 512 bytes
1854 * for compatibility reasons. If file's vattr.va_blocksize
1855 * (preferred I/O block size) is bigger and multiple to chosen
1856 * logical block size -- report it as physical block size.
1858 if (params->blocksize_bytes != 0)
1859 cbe_lun->blocksize = params->blocksize_bytes;
1860 else if (cbe_lun->lun_type == T_CDROM)
1861 cbe_lun->blocksize = 2048;
1863 cbe_lun->blocksize = 512;
1864 be_lun->size_blocks = be_lun->size_bytes / cbe_lun->blocksize;
1865 cbe_lun->maxlba = (be_lun->size_blocks == 0) ?
1866 0 : (be_lun->size_blocks - 1);
1868 us = ps = vattr.va_blocksize;
1871 value = ctl_get_opt(&cbe_lun->options, "pblocksize");
1873 ctl_expand_number(value, &ps);
1874 value = ctl_get_opt(&cbe_lun->options, "pblockoffset");
1876 ctl_expand_number(value, &po);
1877 pss = ps / cbe_lun->blocksize;
1878 pos = po / cbe_lun->blocksize;
1879 if ((pss > 0) && (pss * cbe_lun->blocksize == ps) && (pss >= pos) &&
1880 ((pss & (pss - 1)) == 0) && (pos * cbe_lun->blocksize == po)) {
1881 cbe_lun->pblockexp = fls(pss) - 1;
1882 cbe_lun->pblockoff = (pss - pos) % pss;
1885 value = ctl_get_opt(&cbe_lun->options, "ublocksize");
1887 ctl_expand_number(value, &us);
1888 value = ctl_get_opt(&cbe_lun->options, "ublockoffset");
1890 ctl_expand_number(value, &uo);
1891 uss = us / cbe_lun->blocksize;
1892 uos = uo / cbe_lun->blocksize;
1893 if ((uss > 0) && (uss * cbe_lun->blocksize == us) && (uss >= uos) &&
1894 ((uss & (uss - 1)) == 0) && (uos * cbe_lun->blocksize == uo)) {
1895 cbe_lun->ublockexp = fls(uss) - 1;
1896 cbe_lun->ublockoff = (uss - uos) % uss;
1900 * Sanity check. The media size has to be at least one
1903 if (be_lun->size_bytes < cbe_lun->blocksize) {
1905 snprintf(req->error_str, sizeof(req->error_str),
1906 "file %s size %ju < block size %u", be_lun->dev_path,
1907 (uintmax_t)be_lun->size_bytes, cbe_lun->blocksize);
1910 cbe_lun->opttxferlen = CTLBLK_MAX_IO_SIZE / cbe_lun->blocksize;
1915 ctl_be_block_open_dev(struct ctl_be_block_lun *be_lun, struct ctl_lun_req *req)
1917 struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun;
1918 struct ctl_lun_create_params *params;
1922 int error, atomic, maxio, ref, unmap, tmp;
1923 off_t ps, pss, po, pos, us, uss, uo, uos, otmp;
1925 params = &be_lun->params;
1927 be_lun->dev_type = CTL_BE_BLOCK_DEV;
1928 csw = devvn_refthread(be_lun->vn, &dev, &ref);
1931 if (strcmp(csw->d_name, "zvol") == 0) {
1932 be_lun->dispatch = ctl_be_block_dispatch_zvol;
1933 be_lun->get_lba_status = ctl_be_block_gls_zvol;
1934 atomic = maxio = CTLBLK_MAX_IO_SIZE;
1936 be_lun->dispatch = ctl_be_block_dispatch_dev;
1937 be_lun->get_lba_status = NULL;
1939 maxio = dev->si_iosize_max;
1942 if (maxio > CTLBLK_MAX_IO_SIZE)
1943 maxio = CTLBLK_MAX_IO_SIZE;
1945 be_lun->lun_flush = ctl_be_block_flush_dev;
1946 be_lun->getattr = ctl_be_block_getattr_dev;
1947 be_lun->unmap = ctl_be_block_unmap_dev;
1949 if (!csw->d_ioctl) {
1950 dev_relthread(dev, ref);
1951 snprintf(req->error_str, sizeof(req->error_str),
1952 "no d_ioctl for device %s!", be_lun->dev_path);
1956 error = csw->d_ioctl(dev, DIOCGSECTORSIZE, (caddr_t)&tmp, FREAD,
1959 dev_relthread(dev, ref);
1960 snprintf(req->error_str, sizeof(req->error_str),
1961 "error %d returned for DIOCGSECTORSIZE ioctl "
1962 "on %s!", error, be_lun->dev_path);
1967 * If the user has asked for a blocksize that is greater than the
1968 * backing device's blocksize, we can do it only if the blocksize
1969 * the user is asking for is an even multiple of the underlying
1970 * device's blocksize.
1972 if ((params->blocksize_bytes != 0) &&
1973 (params->blocksize_bytes >= tmp)) {
1974 if (params->blocksize_bytes % tmp == 0) {
1975 cbe_lun->blocksize = params->blocksize_bytes;
1977 dev_relthread(dev, ref);
1978 snprintf(req->error_str, sizeof(req->error_str),
1979 "requested blocksize %u is not an even "
1980 "multiple of backing device blocksize %u",
1981 params->blocksize_bytes, tmp);
1984 } else if (params->blocksize_bytes != 0) {
1985 dev_relthread(dev, ref);
1986 snprintf(req->error_str, sizeof(req->error_str),
1987 "requested blocksize %u < backing device "
1988 "blocksize %u", params->blocksize_bytes, tmp);
1990 } else if (cbe_lun->lun_type == T_CDROM)
1991 cbe_lun->blocksize = MAX(tmp, 2048);
1993 cbe_lun->blocksize = tmp;
1995 error = csw->d_ioctl(dev, DIOCGMEDIASIZE, (caddr_t)&otmp, FREAD,
1998 dev_relthread(dev, ref);
1999 snprintf(req->error_str, sizeof(req->error_str),
2000 "error %d returned for DIOCGMEDIASIZE "
2001 " ioctl on %s!", error,
2006 if (params->lun_size_bytes != 0) {
2007 if (params->lun_size_bytes > otmp) {
2008 dev_relthread(dev, ref);
2009 snprintf(req->error_str, sizeof(req->error_str),
2010 "requested LUN size %ju > backing device "
2012 (uintmax_t)params->lun_size_bytes,
2017 be_lun->size_bytes = params->lun_size_bytes;
2019 be_lun->size_bytes = otmp;
2020 be_lun->size_blocks = be_lun->size_bytes / cbe_lun->blocksize;
2021 cbe_lun->maxlba = (be_lun->size_blocks == 0) ?
2022 0 : (be_lun->size_blocks - 1);
2024 error = csw->d_ioctl(dev, DIOCGSTRIPESIZE, (caddr_t)&ps, FREAD,
2029 error = csw->d_ioctl(dev, DIOCGSTRIPEOFFSET, (caddr_t)&po,
2037 value = ctl_get_opt(&cbe_lun->options, "pblocksize");
2039 ctl_expand_number(value, &ps);
2040 value = ctl_get_opt(&cbe_lun->options, "pblockoffset");
2042 ctl_expand_number(value, &po);
2043 pss = ps / cbe_lun->blocksize;
2044 pos = po / cbe_lun->blocksize;
2045 if ((pss > 0) && (pss * cbe_lun->blocksize == ps) && (pss >= pos) &&
2046 ((pss & (pss - 1)) == 0) && (pos * cbe_lun->blocksize == po)) {
2047 cbe_lun->pblockexp = fls(pss) - 1;
2048 cbe_lun->pblockoff = (pss - pos) % pss;
2051 value = ctl_get_opt(&cbe_lun->options, "ublocksize");
2053 ctl_expand_number(value, &us);
2054 value = ctl_get_opt(&cbe_lun->options, "ublockoffset");
2056 ctl_expand_number(value, &uo);
2057 uss = us / cbe_lun->blocksize;
2058 uos = uo / cbe_lun->blocksize;
2059 if ((uss > 0) && (uss * cbe_lun->blocksize == us) && (uss >= uos) &&
2060 ((uss & (uss - 1)) == 0) && (uos * cbe_lun->blocksize == uo)) {
2061 cbe_lun->ublockexp = fls(uss) - 1;
2062 cbe_lun->ublockoff = (uss - uos) % uss;
2065 cbe_lun->atomicblock = atomic / cbe_lun->blocksize;
2066 cbe_lun->opttxferlen = maxio / cbe_lun->blocksize;
2068 if (be_lun->dispatch == ctl_be_block_dispatch_zvol) {
2071 struct diocgattr_arg arg;
2073 strlcpy(arg.name, "GEOM::candelete", sizeof(arg.name));
2074 arg.len = sizeof(arg.value.i);
2075 error = csw->d_ioctl(dev, DIOCGATTR, (caddr_t)&arg, FREAD,
2077 unmap = (error == 0) ? arg.value.i : 0;
2079 value = ctl_get_opt(&cbe_lun->options, "unmap");
2081 unmap = (strcmp(value, "on") == 0);
2083 cbe_lun->flags |= CTL_LUN_FLAG_UNMAP;
2085 cbe_lun->flags &= ~CTL_LUN_FLAG_UNMAP;
2087 dev_relthread(dev, ref);
2092 ctl_be_block_close(struct ctl_be_block_lun *be_lun)
2094 struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun;
2099 if ((cbe_lun->flags & CTL_LUN_FLAG_READONLY) == 0)
2101 (void)vn_close(be_lun->vn, flags, NOCRED, curthread);
2104 switch (be_lun->dev_type) {
2105 case CTL_BE_BLOCK_DEV:
2107 case CTL_BE_BLOCK_FILE:
2108 if (be_lun->backend.file.cred != NULL) {
2109 crfree(be_lun->backend.file.cred);
2110 be_lun->backend.file.cred = NULL;
2113 case CTL_BE_BLOCK_NONE:
2116 panic("Unexpected backend type %d", be_lun->dev_type);
2119 be_lun->dev_type = CTL_BE_BLOCK_NONE;
2125 ctl_be_block_open(struct ctl_be_block_lun *be_lun, struct ctl_lun_req *req)
2127 struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun;
2128 struct nameidata nd;
2133 if (rootvnode == NULL) {
2134 snprintf(req->error_str, sizeof(req->error_str),
2135 "Root filesystem is not mounted");
2138 if (!curthread->td_proc->p_fd->fd_cdir) {
2139 curthread->td_proc->p_fd->fd_cdir = rootvnode;
2142 if (!curthread->td_proc->p_fd->fd_rdir) {
2143 curthread->td_proc->p_fd->fd_rdir = rootvnode;
2146 if (!curthread->td_proc->p_fd->fd_jdir) {
2147 curthread->td_proc->p_fd->fd_jdir = rootvnode;
2151 value = ctl_get_opt(&cbe_lun->options, "file");
2152 if (value == NULL) {
2153 snprintf(req->error_str, sizeof(req->error_str),
2154 "no file argument specified");
2157 free(be_lun->dev_path, M_CTLBLK);
2158 be_lun->dev_path = strdup(value, M_CTLBLK);
2161 value = ctl_get_opt(&cbe_lun->options, "readonly");
2162 if (value != NULL) {
2163 if (strcmp(value, "on") != 0)
2165 } else if (cbe_lun->lun_type == T_DIRECT)
2169 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, be_lun->dev_path, curthread);
2170 error = vn_open(&nd, &flags, 0, NULL);
2171 if ((error == EROFS || error == EACCES) && (flags & FWRITE)) {
2177 * This is the only reasonable guess we can make as far as
2178 * path if the user doesn't give us a fully qualified path.
2179 * If they want to specify a file, they need to specify the
2182 if (be_lun->dev_path[0] != '/') {
2185 asprintf(&dev_name, M_CTLBLK, "/dev/%s",
2187 free(be_lun->dev_path, M_CTLBLK);
2188 be_lun->dev_path = dev_name;
2191 snprintf(req->error_str, sizeof(req->error_str),
2192 "error opening %s: %d", be_lun->dev_path, error);
2196 cbe_lun->flags &= ~CTL_LUN_FLAG_READONLY;
2198 cbe_lun->flags |= CTL_LUN_FLAG_READONLY;
2200 NDFREE(&nd, NDF_ONLY_PNBUF);
2201 be_lun->vn = nd.ni_vp;
2203 /* We only support disks and files. */
2204 if (vn_isdisk(be_lun->vn, &error)) {
2205 error = ctl_be_block_open_dev(be_lun, req);
2206 } else if (be_lun->vn->v_type == VREG) {
2207 error = ctl_be_block_open_file(be_lun, req);
2210 snprintf(req->error_str, sizeof(req->error_str),
2211 "%s is not a disk or plain file", be_lun->dev_path);
2213 VOP_UNLOCK(be_lun->vn, 0);
2216 ctl_be_block_close(be_lun);
2217 cbe_lun->serseq = CTL_LUN_SERSEQ_OFF;
2218 if (be_lun->dispatch != ctl_be_block_dispatch_dev)
2219 cbe_lun->serseq = CTL_LUN_SERSEQ_READ;
2220 value = ctl_get_opt(&cbe_lun->options, "serseq");
2221 if (value != NULL && strcmp(value, "on") == 0)
2222 cbe_lun->serseq = CTL_LUN_SERSEQ_ON;
2223 else if (value != NULL && strcmp(value, "read") == 0)
2224 cbe_lun->serseq = CTL_LUN_SERSEQ_READ;
2225 else if (value != NULL && strcmp(value, "off") == 0)
2226 cbe_lun->serseq = CTL_LUN_SERSEQ_OFF;
2231 ctl_be_block_create(struct ctl_be_block_softc *softc, struct ctl_lun_req *req)
2233 struct ctl_be_lun *cbe_lun;
2234 struct ctl_be_block_lun *be_lun;
2235 struct ctl_lun_create_params *params;
2236 char num_thread_str[16];
2239 int retval, num_threads;
2240 int tmp_num_threads;
2242 params = &req->reqdata.create;
2244 req->status = CTL_LUN_OK;
2246 be_lun = malloc(sizeof(*be_lun), M_CTLBLK, M_ZERO | M_WAITOK);
2247 cbe_lun = &be_lun->cbe_lun;
2248 cbe_lun->be_lun = be_lun;
2249 be_lun->params = req->reqdata.create;
2250 be_lun->softc = softc;
2251 STAILQ_INIT(&be_lun->input_queue);
2252 STAILQ_INIT(&be_lun->config_read_queue);
2253 STAILQ_INIT(&be_lun->config_write_queue);
2254 STAILQ_INIT(&be_lun->datamove_queue);
2255 sprintf(be_lun->lunname, "cblk%d", softc->num_luns);
2256 mtx_init(&be_lun->io_lock, "cblk io lock", NULL, MTX_DEF);
2257 mtx_init(&be_lun->queue_lock, "cblk queue lock", NULL, MTX_DEF);
2258 ctl_init_opts(&cbe_lun->options,
2259 req->num_be_args, req->kern_be_args);
2260 be_lun->lun_zone = uma_zcreate(be_lun->lunname, CTLBLK_MAX_SEG,
2261 NULL, NULL, NULL, NULL, /*align*/ 0, /*flags*/0);
2262 if (be_lun->lun_zone == NULL) {
2263 snprintf(req->error_str, sizeof(req->error_str),
2264 "error allocating UMA zone");
2268 if (params->flags & CTL_LUN_FLAG_DEV_TYPE)
2269 cbe_lun->lun_type = params->device_type;
2271 cbe_lun->lun_type = T_DIRECT;
2272 be_lun->flags = CTL_BE_BLOCK_LUN_UNCONFIGURED;
2274 value = ctl_get_opt(&cbe_lun->options, "ha_role");
2275 if (value != NULL) {
2276 if (strcmp(value, "primary") == 0)
2277 cbe_lun->flags |= CTL_LUN_FLAG_PRIMARY;
2278 } else if (control_softc->flags & CTL_FLAG_ACTIVE_SHELF)
2279 cbe_lun->flags |= CTL_LUN_FLAG_PRIMARY;
2281 if (cbe_lun->lun_type == T_DIRECT ||
2282 cbe_lun->lun_type == T_CDROM) {
2283 be_lun->size_bytes = params->lun_size_bytes;
2284 if (params->blocksize_bytes != 0)
2285 cbe_lun->blocksize = params->blocksize_bytes;
2286 else if (cbe_lun->lun_type == T_CDROM)
2287 cbe_lun->blocksize = 2048;
2289 cbe_lun->blocksize = 512;
2290 be_lun->size_blocks = be_lun->size_bytes / cbe_lun->blocksize;
2291 cbe_lun->maxlba = (be_lun->size_blocks == 0) ?
2292 0 : (be_lun->size_blocks - 1);
2294 if ((cbe_lun->flags & CTL_LUN_FLAG_PRIMARY) ||
2295 control_softc->ha_mode == CTL_HA_MODE_SER_ONLY) {
2296 retval = ctl_be_block_open(be_lun, req);
2299 req->status = CTL_LUN_WARNING;
2302 num_threads = cbb_num_threads;
2307 value = ctl_get_opt(&cbe_lun->options, "num_threads");
2308 if (value != NULL) {
2309 tmp_num_threads = strtol(value, NULL, 0);
2312 * We don't let the user specify less than one
2313 * thread, but hope he's clueful enough not to
2314 * specify 1000 threads.
2316 if (tmp_num_threads < 1) {
2317 snprintf(req->error_str, sizeof(req->error_str),
2318 "invalid number of threads %s",
2322 num_threads = tmp_num_threads;
2325 if (be_lun->vn == NULL)
2326 cbe_lun->flags |= CTL_LUN_FLAG_NO_MEDIA;
2327 /* Tell the user the blocksize we ended up using */
2328 params->lun_size_bytes = be_lun->size_bytes;
2329 params->blocksize_bytes = cbe_lun->blocksize;
2330 if (params->flags & CTL_LUN_FLAG_ID_REQ) {
2331 cbe_lun->req_lun_id = params->req_lun_id;
2332 cbe_lun->flags |= CTL_LUN_FLAG_ID_REQ;
2334 cbe_lun->req_lun_id = 0;
2336 cbe_lun->lun_shutdown = ctl_be_block_lun_shutdown;
2337 cbe_lun->lun_config_status = ctl_be_block_lun_config_status;
2338 cbe_lun->be = &ctl_be_block_driver;
2340 if ((params->flags & CTL_LUN_FLAG_SERIAL_NUM) == 0) {
2341 snprintf(tmpstr, sizeof(tmpstr), "MYSERIAL%4d",
2343 strncpy((char *)cbe_lun->serial_num, tmpstr,
2344 MIN(sizeof(cbe_lun->serial_num), sizeof(tmpstr)));
2346 /* Tell the user what we used for a serial number */
2347 strncpy((char *)params->serial_num, tmpstr,
2348 MIN(sizeof(params->serial_num), sizeof(tmpstr)));
2350 strncpy((char *)cbe_lun->serial_num, params->serial_num,
2351 MIN(sizeof(cbe_lun->serial_num),
2352 sizeof(params->serial_num)));
2354 if ((params->flags & CTL_LUN_FLAG_DEVID) == 0) {
2355 snprintf(tmpstr, sizeof(tmpstr), "MYDEVID%4d", softc->num_luns);
2356 strncpy((char *)cbe_lun->device_id, tmpstr,
2357 MIN(sizeof(cbe_lun->device_id), sizeof(tmpstr)));
2359 /* Tell the user what we used for a device ID */
2360 strncpy((char *)params->device_id, tmpstr,
2361 MIN(sizeof(params->device_id), sizeof(tmpstr)));
2363 strncpy((char *)cbe_lun->device_id, params->device_id,
2364 MIN(sizeof(cbe_lun->device_id),
2365 sizeof(params->device_id)));
2368 TASK_INIT(&be_lun->io_task, /*priority*/0, ctl_be_block_worker, be_lun);
2370 be_lun->io_taskqueue = taskqueue_create(be_lun->lunname, M_WAITOK,
2371 taskqueue_thread_enqueue, /*context*/&be_lun->io_taskqueue);
2373 if (be_lun->io_taskqueue == NULL) {
2374 snprintf(req->error_str, sizeof(req->error_str),
2375 "unable to create taskqueue");
2380 * Note that we start the same number of threads by default for
2381 * both the file case and the block device case. For the file
2382 * case, we need multiple threads to allow concurrency, because the
2383 * vnode interface is designed to be a blocking interface. For the
2384 * block device case, ZFS zvols at least will block the caller's
2385 * context in many instances, and so we need multiple threads to
2386 * overcome that problem. Other block devices don't need as many
2387 * threads, but they shouldn't cause too many problems.
2389 * If the user wants to just have a single thread for a block
2390 * device, he can specify that when the LUN is created, or change
2391 * the tunable/sysctl to alter the default number of threads.
2393 retval = taskqueue_start_threads(&be_lun->io_taskqueue,
2394 /*num threads*/num_threads,
2397 "%s taskq", be_lun->lunname);
2402 be_lun->num_threads = num_threads;
2404 mtx_lock(&softc->lock);
2406 STAILQ_INSERT_TAIL(&softc->lun_list, be_lun, links);
2408 mtx_unlock(&softc->lock);
2410 retval = ctl_add_lun(&be_lun->cbe_lun);
2412 mtx_lock(&softc->lock);
2413 STAILQ_REMOVE(&softc->lun_list, be_lun, ctl_be_block_lun,
2416 mtx_unlock(&softc->lock);
2417 snprintf(req->error_str, sizeof(req->error_str),
2418 "ctl_add_lun() returned error %d, see dmesg for "
2424 mtx_lock(&softc->lock);
2427 * Tell the config_status routine that we're waiting so it won't
2428 * clean up the LUN in the event of an error.
2430 be_lun->flags |= CTL_BE_BLOCK_LUN_WAITING;
2432 while (be_lun->flags & CTL_BE_BLOCK_LUN_UNCONFIGURED) {
2433 retval = msleep(be_lun, &softc->lock, PCATCH, "ctlblk", 0);
2434 if (retval == EINTR)
2437 be_lun->flags &= ~CTL_BE_BLOCK_LUN_WAITING;
2439 if (be_lun->flags & CTL_BE_BLOCK_LUN_CONFIG_ERR) {
2440 snprintf(req->error_str, sizeof(req->error_str),
2441 "LUN configuration error, see dmesg for details");
2442 STAILQ_REMOVE(&softc->lun_list, be_lun, ctl_be_block_lun,
2445 mtx_unlock(&softc->lock);
2448 params->req_lun_id = cbe_lun->lun_id;
2451 mtx_unlock(&softc->lock);
2453 be_lun->disk_stats = devstat_new_entry("cbb", params->req_lun_id,
2455 DEVSTAT_ALL_SUPPORTED,
2457 | DEVSTAT_TYPE_IF_OTHER,
2458 DEVSTAT_PRIORITY_OTHER);
2463 req->status = CTL_LUN_ERROR;
2465 if (be_lun->io_taskqueue != NULL)
2466 taskqueue_free(be_lun->io_taskqueue);
2467 ctl_be_block_close(be_lun);
2468 if (be_lun->dev_path != NULL)
2469 free(be_lun->dev_path, M_CTLBLK);
2470 if (be_lun->lun_zone != NULL)
2471 uma_zdestroy(be_lun->lun_zone);
2472 ctl_free_opts(&cbe_lun->options);
2473 mtx_destroy(&be_lun->queue_lock);
2474 mtx_destroy(&be_lun->io_lock);
2475 free(be_lun, M_CTLBLK);
2481 ctl_be_block_rm(struct ctl_be_block_softc *softc, struct ctl_lun_req *req)
2483 struct ctl_lun_rm_params *params;
2484 struct ctl_be_block_lun *be_lun;
2485 struct ctl_be_lun *cbe_lun;
2488 params = &req->reqdata.rm;
2490 mtx_lock(&softc->lock);
2491 STAILQ_FOREACH(be_lun, &softc->lun_list, links) {
2492 if (be_lun->cbe_lun.lun_id == params->lun_id)
2495 mtx_unlock(&softc->lock);
2496 if (be_lun == NULL) {
2497 snprintf(req->error_str, sizeof(req->error_str),
2498 "LUN %u is not managed by the block backend",
2502 cbe_lun = &be_lun->cbe_lun;
2504 retval = ctl_disable_lun(cbe_lun);
2506 snprintf(req->error_str, sizeof(req->error_str),
2507 "error %d returned from ctl_disable_lun() for "
2508 "LUN %d", retval, params->lun_id);
2512 if (be_lun->vn != NULL) {
2513 cbe_lun->flags |= CTL_LUN_FLAG_NO_MEDIA;
2514 ctl_lun_no_media(cbe_lun);
2515 taskqueue_drain_all(be_lun->io_taskqueue);
2516 ctl_be_block_close(be_lun);
2519 retval = ctl_invalidate_lun(cbe_lun);
2521 snprintf(req->error_str, sizeof(req->error_str),
2522 "error %d returned from ctl_invalidate_lun() for "
2523 "LUN %d", retval, params->lun_id);
2527 mtx_lock(&softc->lock);
2528 be_lun->flags |= CTL_BE_BLOCK_LUN_WAITING;
2529 while ((be_lun->flags & CTL_BE_BLOCK_LUN_UNCONFIGURED) == 0) {
2530 retval = msleep(be_lun, &softc->lock, PCATCH, "ctlblk", 0);
2531 if (retval == EINTR)
2534 be_lun->flags &= ~CTL_BE_BLOCK_LUN_WAITING;
2536 if ((be_lun->flags & CTL_BE_BLOCK_LUN_UNCONFIGURED) == 0) {
2537 snprintf(req->error_str, sizeof(req->error_str),
2538 "interrupted waiting for LUN to be freed");
2539 mtx_unlock(&softc->lock);
2543 STAILQ_REMOVE(&softc->lun_list, be_lun, ctl_be_block_lun, links);
2546 mtx_unlock(&softc->lock);
2548 taskqueue_drain_all(be_lun->io_taskqueue);
2549 taskqueue_free(be_lun->io_taskqueue);
2551 if (be_lun->disk_stats != NULL)
2552 devstat_remove_entry(be_lun->disk_stats);
2554 uma_zdestroy(be_lun->lun_zone);
2556 ctl_free_opts(&cbe_lun->options);
2557 free(be_lun->dev_path, M_CTLBLK);
2558 mtx_destroy(&be_lun->queue_lock);
2559 mtx_destroy(&be_lun->io_lock);
2560 free(be_lun, M_CTLBLK);
2562 req->status = CTL_LUN_OK;
2566 req->status = CTL_LUN_ERROR;
2571 ctl_be_block_modify(struct ctl_be_block_softc *softc, struct ctl_lun_req *req)
2573 struct ctl_lun_modify_params *params;
2574 struct ctl_be_block_lun *be_lun;
2575 struct ctl_be_lun *cbe_lun;
2580 params = &req->reqdata.modify;
2582 mtx_lock(&softc->lock);
2583 STAILQ_FOREACH(be_lun, &softc->lun_list, links) {
2584 if (be_lun->cbe_lun.lun_id == params->lun_id)
2587 mtx_unlock(&softc->lock);
2588 if (be_lun == NULL) {
2589 snprintf(req->error_str, sizeof(req->error_str),
2590 "LUN %u is not managed by the block backend",
2594 cbe_lun = &be_lun->cbe_lun;
2596 if (params->lun_size_bytes != 0)
2597 be_lun->params.lun_size_bytes = params->lun_size_bytes;
2598 ctl_update_opts(&cbe_lun->options, req->num_be_args, req->kern_be_args);
2600 wasprim = (cbe_lun->flags & CTL_LUN_FLAG_PRIMARY);
2601 value = ctl_get_opt(&cbe_lun->options, "ha_role");
2602 if (value != NULL) {
2603 if (strcmp(value, "primary") == 0)
2604 cbe_lun->flags |= CTL_LUN_FLAG_PRIMARY;
2606 cbe_lun->flags &= ~CTL_LUN_FLAG_PRIMARY;
2607 } else if (control_softc->flags & CTL_FLAG_ACTIVE_SHELF)
2608 cbe_lun->flags |= CTL_LUN_FLAG_PRIMARY;
2610 cbe_lun->flags &= ~CTL_LUN_FLAG_PRIMARY;
2611 if (wasprim != (cbe_lun->flags & CTL_LUN_FLAG_PRIMARY)) {
2612 if (cbe_lun->flags & CTL_LUN_FLAG_PRIMARY)
2613 ctl_lun_primary(cbe_lun);
2615 ctl_lun_secondary(cbe_lun);
2618 oldsize = be_lun->size_blocks;
2619 if ((cbe_lun->flags & CTL_LUN_FLAG_PRIMARY) ||
2620 control_softc->ha_mode == CTL_HA_MODE_SER_ONLY) {
2621 if (be_lun->vn == NULL)
2622 error = ctl_be_block_open(be_lun, req);
2623 else if (vn_isdisk(be_lun->vn, &error))
2624 error = ctl_be_block_open_dev(be_lun, req);
2625 else if (be_lun->vn->v_type == VREG) {
2626 vn_lock(be_lun->vn, LK_SHARED | LK_RETRY);
2627 error = ctl_be_block_open_file(be_lun, req);
2628 VOP_UNLOCK(be_lun->vn, 0);
2631 if ((cbe_lun->flags & CTL_LUN_FLAG_NO_MEDIA) &&
2632 be_lun->vn != NULL) {
2633 cbe_lun->flags &= ~CTL_LUN_FLAG_NO_MEDIA;
2634 ctl_lun_has_media(cbe_lun);
2635 } else if ((cbe_lun->flags & CTL_LUN_FLAG_NO_MEDIA) == 0 &&
2636 be_lun->vn == NULL) {
2637 cbe_lun->flags |= CTL_LUN_FLAG_NO_MEDIA;
2638 ctl_lun_no_media(cbe_lun);
2640 cbe_lun->flags &= ~CTL_LUN_FLAG_EJECTED;
2642 if (be_lun->vn != NULL) {
2643 cbe_lun->flags |= CTL_LUN_FLAG_NO_MEDIA;
2644 ctl_lun_no_media(cbe_lun);
2645 taskqueue_drain_all(be_lun->io_taskqueue);
2646 error = ctl_be_block_close(be_lun);
2650 if (be_lun->size_blocks != oldsize)
2651 ctl_lun_capacity_changed(cbe_lun);
2653 /* Tell the user the exact size we ended up using */
2654 params->lun_size_bytes = be_lun->size_bytes;
2656 req->status = error ? CTL_LUN_WARNING : CTL_LUN_OK;
2660 req->status = CTL_LUN_ERROR;
2665 ctl_be_block_lun_shutdown(void *be_lun)
2667 struct ctl_be_block_lun *lun;
2668 struct ctl_be_block_softc *softc;
2670 lun = (struct ctl_be_block_lun *)be_lun;
2673 mtx_lock(&softc->lock);
2674 lun->flags |= CTL_BE_BLOCK_LUN_UNCONFIGURED;
2675 if (lun->flags & CTL_BE_BLOCK_LUN_WAITING)
2677 mtx_unlock(&softc->lock);
2681 ctl_be_block_lun_config_status(void *be_lun, ctl_lun_config_status status)
2683 struct ctl_be_block_lun *lun;
2684 struct ctl_be_block_softc *softc;
2686 lun = (struct ctl_be_block_lun *)be_lun;
2689 if (status == CTL_LUN_CONFIG_OK) {
2690 mtx_lock(&softc->lock);
2691 lun->flags &= ~CTL_BE_BLOCK_LUN_UNCONFIGURED;
2692 if (lun->flags & CTL_BE_BLOCK_LUN_WAITING)
2694 mtx_unlock(&softc->lock);
2697 * We successfully added the LUN, attempt to enable it.
2699 if (ctl_enable_lun(&lun->cbe_lun) != 0) {
2700 printf("%s: ctl_enable_lun() failed!\n", __func__);
2701 if (ctl_invalidate_lun(&lun->cbe_lun) != 0) {
2702 printf("%s: ctl_invalidate_lun() failed!\n",
2711 mtx_lock(&softc->lock);
2712 lun->flags &= ~CTL_BE_BLOCK_LUN_UNCONFIGURED;
2713 lun->flags |= CTL_BE_BLOCK_LUN_CONFIG_ERR;
2715 mtx_unlock(&softc->lock);
2720 ctl_be_block_config_write(union ctl_io *io)
2722 struct ctl_be_block_lun *be_lun;
2723 struct ctl_be_lun *cbe_lun;
2726 DPRINTF("entered\n");
2728 cbe_lun = CTL_BACKEND_LUN(io);
2729 be_lun = (struct ctl_be_block_lun *)cbe_lun->be_lun;
2732 switch (io->scsiio.cdb[0]) {
2733 case SYNCHRONIZE_CACHE:
2734 case SYNCHRONIZE_CACHE_16:
2739 * The upper level CTL code will filter out any CDBs with
2740 * the immediate bit set and return the proper error.
2742 * We don't really need to worry about what LBA range the
2743 * user asked to be synced out. When they issue a sync
2744 * cache command, we'll sync out the whole thing.
2746 mtx_lock(&be_lun->queue_lock);
2747 STAILQ_INSERT_TAIL(&be_lun->config_write_queue, &io->io_hdr,
2749 mtx_unlock(&be_lun->queue_lock);
2750 taskqueue_enqueue(be_lun->io_taskqueue, &be_lun->io_task);
2752 case START_STOP_UNIT: {
2753 struct scsi_start_stop_unit *cdb;
2754 struct ctl_lun_req req;
2756 cdb = (struct scsi_start_stop_unit *)io->scsiio.cdb;
2757 if ((cdb->how & SSS_PC_MASK) != 0) {
2758 ctl_set_success(&io->scsiio);
2759 ctl_config_write_done(io);
2762 if (cdb->how & SSS_START) {
2763 if ((cdb->how & SSS_LOEJ) && be_lun->vn == NULL) {
2764 retval = ctl_be_block_open(be_lun, &req);
2765 cbe_lun->flags &= ~CTL_LUN_FLAG_EJECTED;
2767 cbe_lun->flags &= ~CTL_LUN_FLAG_NO_MEDIA;
2768 ctl_lun_has_media(cbe_lun);
2770 cbe_lun->flags |= CTL_LUN_FLAG_NO_MEDIA;
2771 ctl_lun_no_media(cbe_lun);
2774 ctl_start_lun(cbe_lun);
2776 ctl_stop_lun(cbe_lun);
2777 if (cdb->how & SSS_LOEJ) {
2778 cbe_lun->flags |= CTL_LUN_FLAG_NO_MEDIA;
2779 cbe_lun->flags |= CTL_LUN_FLAG_EJECTED;
2780 ctl_lun_ejected(cbe_lun);
2781 if (be_lun->vn != NULL)
2782 ctl_be_block_close(be_lun);
2786 ctl_set_success(&io->scsiio);
2787 ctl_config_write_done(io);
2791 ctl_set_success(&io->scsiio);
2792 ctl_config_write_done(io);
2795 ctl_set_invalid_opcode(&io->scsiio);
2796 ctl_config_write_done(io);
2797 retval = CTL_RETVAL_COMPLETE;
2805 ctl_be_block_config_read(union ctl_io *io)
2807 struct ctl_be_block_lun *be_lun;
2808 struct ctl_be_lun *cbe_lun;
2811 DPRINTF("entered\n");
2813 cbe_lun = CTL_BACKEND_LUN(io);
2814 be_lun = (struct ctl_be_block_lun *)cbe_lun->be_lun;
2816 switch (io->scsiio.cdb[0]) {
2817 case SERVICE_ACTION_IN:
2818 if (io->scsiio.cdb[1] == SGLS_SERVICE_ACTION) {
2819 mtx_lock(&be_lun->queue_lock);
2820 STAILQ_INSERT_TAIL(&be_lun->config_read_queue,
2821 &io->io_hdr, links);
2822 mtx_unlock(&be_lun->queue_lock);
2823 taskqueue_enqueue(be_lun->io_taskqueue,
2825 retval = CTL_RETVAL_QUEUED;
2828 ctl_set_invalid_field(&io->scsiio,
2834 ctl_config_read_done(io);
2835 retval = CTL_RETVAL_COMPLETE;
2838 ctl_set_invalid_opcode(&io->scsiio);
2839 ctl_config_read_done(io);
2840 retval = CTL_RETVAL_COMPLETE;
2848 ctl_be_block_lun_info(void *be_lun, struct sbuf *sb)
2850 struct ctl_be_block_lun *lun;
2853 lun = (struct ctl_be_block_lun *)be_lun;
2855 retval = sbuf_printf(sb, "\t<num_threads>");
2858 retval = sbuf_printf(sb, "%d", lun->num_threads);
2861 retval = sbuf_printf(sb, "</num_threads>\n");
2868 ctl_be_block_lun_attr(void *be_lun, const char *attrname)
2870 struct ctl_be_block_lun *lun = (struct ctl_be_block_lun *)be_lun;
2872 if (lun->getattr == NULL)
2873 return (UINT64_MAX);
2874 return (lun->getattr(lun, attrname));
2878 ctl_be_block_init(void)
2880 struct ctl_be_block_softc *softc = &backend_block_softc;
2882 mtx_init(&softc->lock, "ctlblock", NULL, MTX_DEF);
2883 softc->beio_zone = uma_zcreate("beio", sizeof(struct ctl_be_block_io),
2884 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
2885 STAILQ_INIT(&softc->lun_list);
2891 ctl_be_block_shutdown(void)
2893 struct ctl_be_block_softc *softc = &backend_block_softc;
2894 struct ctl_be_block_lun *lun, *next_lun;
2896 mtx_lock(&softc->lock);
2897 STAILQ_FOREACH_SAFE(lun, &softc->lun_list, links, next_lun) {
2899 * Drop our lock here. Since ctl_invalidate_lun() can call
2900 * back into us, this could potentially lead to a recursive
2901 * lock of the same mutex, which would cause a hang.
2903 mtx_unlock(&softc->lock);
2904 ctl_disable_lun(&lun->cbe_lun);
2905 ctl_invalidate_lun(&lun->cbe_lun);
2906 mtx_lock(&softc->lock);
2908 mtx_unlock(&softc->lock);
2910 uma_zdestroy(softc->beio_zone);
2911 mtx_destroy(&softc->lock);