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freebsd-nq/sys/cam/ctl/ctl_backend_block.c
Konstantin Belousov 0ef5eee9d9 Add vn_lktype_write() 
and remove repetetive code that calculates vnode locking type for write.

Reviewed by:	khng, markj
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D31405
2021-08-04 19:40:13 +03:00

2807 lines
76 KiB
C
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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2003 Silicon Graphics International Corp.
* Copyright (c) 2009-2011 Spectra Logic Corporation
* Copyright (c) 2012 The FreeBSD Foundation
* Copyright (c) 2014-2015 Alexander Motin <mav@FreeBSD.org>
* All rights reserved.
*
* Portions of this software were developed by Edward Tomasz Napierala
* under sponsorship from the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* $Id: //depot/users/kenm/FreeBSD-test2/sys/cam/ctl/ctl_backend_block.c#5 $
*/
/*
* CAM Target Layer driver backend for block devices.
*
* Author: Ken Merry <ken@FreeBSD.org>
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/types.h>
#include <sys/kthread.h>
#include <sys/bio.h>
#include <sys/fcntl.h>
#include <sys/limits.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/condvar.h>
#include <sys/malloc.h>
#include <sys/conf.h>
#include <sys/ioccom.h>
#include <sys/queue.h>
#include <sys/sbuf.h>
#include <sys/endian.h>
#include <sys/uio.h>
#include <sys/buf.h>
#include <sys/taskqueue.h>
#include <sys/vnode.h>
#include <sys/namei.h>
#include <sys/mount.h>
#include <sys/disk.h>
#include <sys/fcntl.h>
#include <sys/filedesc.h>
#include <sys/filio.h>
#include <sys/proc.h>
#include <sys/pcpu.h>
#include <sys/module.h>
#include <sys/sdt.h>
#include <sys/devicestat.h>
#include <sys/sysctl.h>
#include <sys/nv.h>
#include <sys/dnv.h>
#include <sys/sx.h>
#include <geom/geom.h>
#include <cam/cam.h>
#include <cam/scsi/scsi_all.h>
#include <cam/scsi/scsi_da.h>
#include <cam/ctl/ctl_io.h>
#include <cam/ctl/ctl.h>
#include <cam/ctl/ctl_backend.h>
#include <cam/ctl/ctl_ioctl.h>
#include <cam/ctl/ctl_ha.h>
#include <cam/ctl/ctl_scsi_all.h>
#include <cam/ctl/ctl_private.h>
#include <cam/ctl/ctl_error.h>
/*
* The idea here is that we'll allocate enough S/G space to hold a 1MB
* I/O. If we get an I/O larger than that, we'll split it.
*/
#define CTLBLK_HALF_IO_SIZE (512 * 1024)
#define CTLBLK_MAX_IO_SIZE (CTLBLK_HALF_IO_SIZE * 2)
#define CTLBLK_MIN_SEG (128 * 1024)
#define CTLBLK_MAX_SEG MIN(CTLBLK_HALF_IO_SIZE, maxphys)
#define CTLBLK_HALF_SEGS MAX(CTLBLK_HALF_IO_SIZE / CTLBLK_MIN_SEG, 1)
#define CTLBLK_MAX_SEGS (CTLBLK_HALF_SEGS * 2)
#define CTLBLK_NUM_SEGS (CTLBLK_MAX_IO_SIZE / CTLBLK_MAX_SEG)
#ifdef CTLBLK_DEBUG
#define DPRINTF(fmt, args...) \
printf("cbb(%s:%d): " fmt, __FUNCTION__, __LINE__, ##args)
#else
#define DPRINTF(fmt, args...) do {} while(0)
#endif
#define PRIV(io) \
((struct ctl_ptr_len_flags *)&(io)->io_hdr.ctl_private[CTL_PRIV_BACKEND])
#define ARGS(io) \
((struct ctl_lba_len_flags *)&(io)->io_hdr.ctl_private[CTL_PRIV_LBA_LEN])
SDT_PROVIDER_DEFINE(cbb);
typedef enum {
CTL_BE_BLOCK_LUN_UNCONFIGURED = 0x01,
CTL_BE_BLOCK_LUN_WAITING = 0x04,
} ctl_be_block_lun_flags;
typedef enum {
CTL_BE_BLOCK_NONE,
CTL_BE_BLOCK_DEV,
CTL_BE_BLOCK_FILE
} ctl_be_block_type;
struct ctl_be_block_filedata {
struct ucred *cred;
};
union ctl_be_block_bedata {
struct ctl_be_block_filedata file;
};
struct ctl_be_block_io;
struct ctl_be_block_lun;
typedef void (*cbb_dispatch_t)(struct ctl_be_block_lun *be_lun,
struct ctl_be_block_io *beio);
typedef uint64_t (*cbb_getattr_t)(struct ctl_be_block_lun *be_lun,
const char *attrname);
/*
* Backend LUN structure. There is a 1:1 mapping between a block device
* and a backend block LUN, and between a backend block LUN and a CTL LUN.
*/
struct ctl_be_block_lun {
struct ctl_be_lun cbe_lun; /* Must be first element. */
struct ctl_lun_create_params params;
char *dev_path;
ctl_be_block_type dev_type;
struct vnode *vn;
union ctl_be_block_bedata backend;
cbb_dispatch_t dispatch;
cbb_dispatch_t lun_flush;
cbb_dispatch_t unmap;
cbb_dispatch_t get_lba_status;
cbb_getattr_t getattr;
uint64_t size_blocks;
uint64_t size_bytes;
struct ctl_be_block_softc *softc;
struct devstat *disk_stats;
ctl_be_block_lun_flags flags;
SLIST_ENTRY(ctl_be_block_lun) links;
struct taskqueue *io_taskqueue;
struct task io_task;
int num_threads;
STAILQ_HEAD(, ctl_io_hdr) input_queue;
STAILQ_HEAD(, ctl_io_hdr) config_read_queue;
STAILQ_HEAD(, ctl_io_hdr) config_write_queue;
STAILQ_HEAD(, ctl_io_hdr) datamove_queue;
struct mtx_padalign io_lock;
struct mtx_padalign queue_lock;
};
/*
* Overall softc structure for the block backend module.
*/
struct ctl_be_block_softc {
struct sx modify_lock;
struct mtx lock;
int num_luns;
SLIST_HEAD(, ctl_be_block_lun) lun_list;
uma_zone_t beio_zone;
uma_zone_t bufmin_zone;
uma_zone_t bufmax_zone;
};
static struct ctl_be_block_softc backend_block_softc;
/*
* Per-I/O information.
*/
struct ctl_be_block_io {
union ctl_io *io;
struct ctl_sg_entry sg_segs[CTLBLK_MAX_SEGS];
struct iovec xiovecs[CTLBLK_MAX_SEGS];
int refcnt;
int bio_cmd;
int two_sglists;
int num_segs;
int num_bios_sent;
int num_bios_done;
int send_complete;
int first_error;
uint64_t first_error_offset;
struct bintime ds_t0;
devstat_tag_type ds_tag_type;
devstat_trans_flags ds_trans_type;
uint64_t io_len;
uint64_t io_offset;
int io_arg;
struct ctl_be_block_softc *softc;
struct ctl_be_block_lun *lun;
void (*beio_cont)(struct ctl_be_block_io *beio); /* to continue processing */
};
extern struct ctl_softc *control_softc;
static int cbb_num_threads = 32;
SYSCTL_NODE(_kern_cam_ctl, OID_AUTO, block, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
"CAM Target Layer Block Backend");
SYSCTL_INT(_kern_cam_ctl_block, OID_AUTO, num_threads, CTLFLAG_RWTUN,
&cbb_num_threads, 0, "Number of threads per backing file");
static struct ctl_be_block_io *ctl_alloc_beio(struct ctl_be_block_softc *softc);
static void ctl_free_beio(struct ctl_be_block_io *beio);
static void ctl_complete_beio(struct ctl_be_block_io *beio);
static int ctl_be_block_move_done(union ctl_io *io, bool samethr);
static void ctl_be_block_biodone(struct bio *bio);
static void ctl_be_block_flush_file(struct ctl_be_block_lun *be_lun,
struct ctl_be_block_io *beio);
static void ctl_be_block_dispatch_file(struct ctl_be_block_lun *be_lun,
struct ctl_be_block_io *beio);
static void ctl_be_block_gls_file(struct ctl_be_block_lun *be_lun,
struct ctl_be_block_io *beio);
static uint64_t ctl_be_block_getattr_file(struct ctl_be_block_lun *be_lun,
const char *attrname);
static void ctl_be_block_flush_dev(struct ctl_be_block_lun *be_lun,
struct ctl_be_block_io *beio);
static void ctl_be_block_unmap_dev(struct ctl_be_block_lun *be_lun,
struct ctl_be_block_io *beio);
static void ctl_be_block_dispatch_dev(struct ctl_be_block_lun *be_lun,
struct ctl_be_block_io *beio);
static uint64_t ctl_be_block_getattr_dev(struct ctl_be_block_lun *be_lun,
const char *attrname);
static void ctl_be_block_cr_dispatch(struct ctl_be_block_lun *be_lun,
union ctl_io *io);
static void ctl_be_block_cw_dispatch(struct ctl_be_block_lun *be_lun,
union ctl_io *io);
static void ctl_be_block_dispatch(struct ctl_be_block_lun *be_lun,
union ctl_io *io);
static void ctl_be_block_worker(void *context, int pending);
static int ctl_be_block_submit(union ctl_io *io);
static int ctl_be_block_ioctl(struct cdev *dev, u_long cmd, caddr_t addr,
int flag, struct thread *td);
static int ctl_be_block_open_file(struct ctl_be_block_lun *be_lun,
struct ctl_lun_req *req);
static int ctl_be_block_open_dev(struct ctl_be_block_lun *be_lun,
struct ctl_lun_req *req);
static int ctl_be_block_close(struct ctl_be_block_lun *be_lun);
static int ctl_be_block_open(struct ctl_be_block_lun *be_lun,
struct ctl_lun_req *req);
static int ctl_be_block_create(struct ctl_be_block_softc *softc,
struct ctl_lun_req *req);
static int ctl_be_block_rm(struct ctl_be_block_softc *softc,
struct ctl_lun_req *req);
static int ctl_be_block_modify(struct ctl_be_block_softc *softc,
struct ctl_lun_req *req);
static void ctl_be_block_lun_shutdown(struct ctl_be_lun *cbe_lun);
static int ctl_be_block_config_write(union ctl_io *io);
static int ctl_be_block_config_read(union ctl_io *io);
static int ctl_be_block_lun_info(struct ctl_be_lun *cbe_lun, struct sbuf *sb);
static uint64_t ctl_be_block_lun_attr(struct ctl_be_lun *cbe_lun, const char *attrname);
static int ctl_be_block_init(void);
static int ctl_be_block_shutdown(void);
static struct ctl_backend_driver ctl_be_block_driver =
{
.name = "block",
.flags = CTL_BE_FLAG_HAS_CONFIG,
.init = ctl_be_block_init,
.shutdown = ctl_be_block_shutdown,
.data_submit = ctl_be_block_submit,
.config_read = ctl_be_block_config_read,
.config_write = ctl_be_block_config_write,
.ioctl = ctl_be_block_ioctl,
.lun_info = ctl_be_block_lun_info,
.lun_attr = ctl_be_block_lun_attr
};
MALLOC_DEFINE(M_CTLBLK, "ctlblock", "Memory used for CTL block backend");
CTL_BACKEND_DECLARE(cbb, ctl_be_block_driver);
static void
ctl_alloc_seg(struct ctl_be_block_softc *softc, struct ctl_sg_entry *sg,
size_t len)
{
if (len <= CTLBLK_MIN_SEG) {
sg->addr = uma_zalloc(softc->bufmin_zone, M_WAITOK);
} else {
KASSERT(len <= CTLBLK_MAX_SEG,
("Too large alloc %zu > %lu", len, CTLBLK_MAX_SEG));
sg->addr = uma_zalloc(softc->bufmax_zone, M_WAITOK);
}
sg->len = len;
}
static void
ctl_free_seg(struct ctl_be_block_softc *softc, struct ctl_sg_entry *sg)
{
if (sg->len <= CTLBLK_MIN_SEG) {
uma_zfree(softc->bufmin_zone, sg->addr);
} else {
KASSERT(sg->len <= CTLBLK_MAX_SEG,
("Too large free %zu > %lu", sg->len, CTLBLK_MAX_SEG));
uma_zfree(softc->bufmax_zone, sg->addr);
}
}
static struct ctl_be_block_io *
ctl_alloc_beio(struct ctl_be_block_softc *softc)
{
struct ctl_be_block_io *beio;
beio = uma_zalloc(softc->beio_zone, M_WAITOK | M_ZERO);
beio->softc = softc;
beio->refcnt = 1;
return (beio);
}
static void
ctl_real_free_beio(struct ctl_be_block_io *beio)
{
struct ctl_be_block_softc *softc = beio->softc;
int i;
for (i = 0; i < beio->num_segs; i++) {
ctl_free_seg(softc, &beio->sg_segs[i]);
/* For compare we had two equal S/G lists. */
if (beio->two_sglists) {
ctl_free_seg(softc,
&beio->sg_segs[i + CTLBLK_HALF_SEGS]);
}
}
uma_zfree(softc->beio_zone, beio);
}
static void
ctl_refcnt_beio(void *arg, int diff)
{
struct ctl_be_block_io *beio = arg;
if (atomic_fetchadd_int(&beio->refcnt, diff) + diff == 0)
ctl_real_free_beio(beio);
}
static void
ctl_free_beio(struct ctl_be_block_io *beio)
{
ctl_refcnt_beio(beio, -1);
}
static void
ctl_complete_beio(struct ctl_be_block_io *beio)
{
union ctl_io *io = beio->io;
if (beio->beio_cont != NULL) {
beio->beio_cont(beio);
} else {
ctl_free_beio(beio);
ctl_data_submit_done(io);
}
}
static size_t
cmp(uint8_t *a, uint8_t *b, size_t size)
{
size_t i;
for (i = 0; i < size; i++) {
if (a[i] != b[i])
break;
}
return (i);
}
static void
ctl_be_block_compare(union ctl_io *io)
{
struct ctl_be_block_io *beio;
uint64_t off, res;
int i;
uint8_t info[8];
beio = (struct ctl_be_block_io *)PRIV(io)->ptr;
off = 0;
for (i = 0; i < beio->num_segs; i++) {
res = cmp(beio->sg_segs[i].addr,
beio->sg_segs[i + CTLBLK_HALF_SEGS].addr,
beio->sg_segs[i].len);
off += res;
if (res < beio->sg_segs[i].len)
break;
}
if (i < beio->num_segs) {
scsi_u64to8b(off, info);
ctl_set_sense(&io->scsiio, /*current_error*/ 1,
/*sense_key*/ SSD_KEY_MISCOMPARE,
/*asc*/ 0x1D, /*ascq*/ 0x00,
/*type*/ SSD_ELEM_INFO,
/*size*/ sizeof(info), /*data*/ &info,
/*type*/ SSD_ELEM_NONE);
} else
ctl_set_success(&io->scsiio);
}
static int
ctl_be_block_move_done(union ctl_io *io, bool samethr)
{
struct ctl_be_block_io *beio;
struct ctl_be_block_lun *be_lun;
struct ctl_lba_len_flags *lbalen;
beio = (struct ctl_be_block_io *)PRIV(io)->ptr;
DPRINTF("entered\n");
io->scsiio.kern_rel_offset += io->scsiio.kern_data_len;
/*
* We set status at this point for read and compare commands.
*/
if ((io->io_hdr.flags & CTL_FLAG_ABORT) == 0 &&
(io->io_hdr.status & CTL_STATUS_MASK) == CTL_STATUS_NONE) {
lbalen = ARGS(io);
if (lbalen->flags & CTL_LLF_READ) {
ctl_set_success(&io->scsiio);
} else if (lbalen->flags & CTL_LLF_COMPARE) {
/* We have two data blocks ready for comparison. */
ctl_be_block_compare(io);
}
}
/*
* If this is a read, or a write with errors, it is done.
*/
if ((beio->bio_cmd == BIO_READ)
|| ((io->io_hdr.flags & CTL_FLAG_ABORT) != 0)
|| ((io->io_hdr.status & CTL_STATUS_MASK) != CTL_STATUS_NONE)) {
ctl_complete_beio(beio);
return (0);
}
/*
* At this point, we have a write and the DMA completed successfully.
* If we were called synchronously in the original thread then just
* dispatch, otherwise we now have to queue it to the task queue to
* execute the backend I/O. That is because we do blocking
* memory allocations, and in the file backing case, blocking I/O.
* This move done routine is generally called in the SIM's
* interrupt context, and therefore we cannot block.
*/
be_lun = (struct ctl_be_block_lun *)CTL_BACKEND_LUN(io);
if (samethr) {
be_lun->dispatch(be_lun, beio);
} else {
mtx_lock(&be_lun->queue_lock);
STAILQ_INSERT_TAIL(&be_lun->datamove_queue, &io->io_hdr, links);
mtx_unlock(&be_lun->queue_lock);
taskqueue_enqueue(be_lun->io_taskqueue, &be_lun->io_task);
}
return (0);
}
static void
ctl_be_block_biodone(struct bio *bio)
{
struct ctl_be_block_io *beio = bio->bio_caller1;
struct ctl_be_block_lun *be_lun = beio->lun;
struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun;
union ctl_io *io;
int error;
io = beio->io;
DPRINTF("entered\n");
error = bio->bio_error;
mtx_lock(&be_lun->io_lock);
if (error != 0 &&
(beio->first_error == 0 ||
bio->bio_offset < beio->first_error_offset)) {
beio->first_error = error;
beio->first_error_offset = bio->bio_offset;
}
beio->num_bios_done++;
/*
* XXX KDM will this cause WITNESS to complain? Holding a lock
* during the free might cause it to complain.
*/
g_destroy_bio(bio);
/*
* If the send complete bit isn't set, or we aren't the last I/O to
* complete, then we're done.
*/
if ((beio->send_complete == 0)
|| (beio->num_bios_done < beio->num_bios_sent)) {
mtx_unlock(&be_lun->io_lock);
return;
}
/*
* At this point, we've verified that we are the last I/O to
* complete, so it's safe to drop the lock.
*/
devstat_end_transaction(beio->lun->disk_stats, beio->io_len,
beio->ds_tag_type, beio->ds_trans_type,
/*now*/ NULL, /*then*/&beio->ds_t0);
mtx_unlock(&be_lun->io_lock);
/*
* If there are any errors from the backing device, we fail the
* entire I/O with a medium error.
*/
error = beio->first_error;
if (error != 0) {
if (error == EOPNOTSUPP) {
ctl_set_invalid_opcode(&io->scsiio);
} else if (error == ENOSPC || error == EDQUOT) {
ctl_set_space_alloc_fail(&io->scsiio);
} else if (error == EROFS || error == EACCES) {
ctl_set_hw_write_protected(&io->scsiio);
} else if (beio->bio_cmd == BIO_FLUSH) {
/* XXX KDM is there is a better error here? */
ctl_set_internal_failure(&io->scsiio,
/*sks_valid*/ 1,
/*retry_count*/ 0xbad2);
} else {
ctl_set_medium_error(&io->scsiio,
beio->bio_cmd == BIO_READ);
}
ctl_complete_beio(beio);
return;
}
/*
* If this is a write, a flush, a delete or verify, we're all done.
* If this is a read, we can now send the data to the user.
*/
if ((beio->bio_cmd == BIO_WRITE)
|| (beio->bio_cmd == BIO_FLUSH)
|| (beio->bio_cmd == BIO_DELETE)
|| (ARGS(io)->flags & CTL_LLF_VERIFY)) {
ctl_set_success(&io->scsiio);
ctl_complete_beio(beio);
} else {
if ((ARGS(io)->flags & CTL_LLF_READ) &&
beio->beio_cont == NULL) {
ctl_set_success(&io->scsiio);
if (cbe_lun->serseq >= CTL_LUN_SERSEQ_SOFT)
ctl_serseq_done(io);
}
ctl_datamove(io);
}
}
static void
ctl_be_block_flush_file(struct ctl_be_block_lun *be_lun,
struct ctl_be_block_io *beio)
{
union ctl_io *io = beio->io;
struct mount *mountpoint;
int error;
DPRINTF("entered\n");
binuptime(&beio->ds_t0);
devstat_start_transaction(beio->lun->disk_stats, &beio->ds_t0);
(void) vn_start_write(be_lun->vn, &mountpoint, V_WAIT);
vn_lock(be_lun->vn, vn_lktype_write(mountpoint, be_lun->vn) |
LK_RETRY);
error = VOP_FSYNC(be_lun->vn, beio->io_arg ? MNT_NOWAIT : MNT_WAIT,
curthread);
VOP_UNLOCK(be_lun->vn);
vn_finished_write(mountpoint);
mtx_lock(&be_lun->io_lock);
devstat_end_transaction(beio->lun->disk_stats, beio->io_len,
beio->ds_tag_type, beio->ds_trans_type,
/*now*/ NULL, /*then*/&beio->ds_t0);
mtx_unlock(&be_lun->io_lock);
if (error == 0)
ctl_set_success(&io->scsiio);
else {
/* XXX KDM is there is a better error here? */
ctl_set_internal_failure(&io->scsiio,
/*sks_valid*/ 1,
/*retry_count*/ 0xbad1);
}
ctl_complete_beio(beio);
}
SDT_PROBE_DEFINE1(cbb, , read, file_start, "uint64_t");
SDT_PROBE_DEFINE1(cbb, , write, file_start, "uint64_t");
SDT_PROBE_DEFINE1(cbb, , read, file_done,"uint64_t");
SDT_PROBE_DEFINE1(cbb, , write, file_done, "uint64_t");
static void
ctl_be_block_dispatch_file(struct ctl_be_block_lun *be_lun,
struct ctl_be_block_io *beio)
{
struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun;
struct ctl_be_block_filedata *file_data;
union ctl_io *io;
struct uio xuio;
struct iovec *xiovec;
size_t s;
int error, flags, i;
DPRINTF("entered\n");
file_data = &be_lun->backend.file;
io = beio->io;
flags = 0;
if (ARGS(io)->flags & CTL_LLF_DPO)
flags |= IO_DIRECT;
if (beio->bio_cmd == BIO_WRITE && ARGS(io)->flags & CTL_LLF_FUA)
flags |= IO_SYNC;
bzero(&xuio, sizeof(xuio));
if (beio->bio_cmd == BIO_READ) {
SDT_PROBE0(cbb, , read, file_start);
xuio.uio_rw = UIO_READ;
} else {
SDT_PROBE0(cbb, , write, file_start);
xuio.uio_rw = UIO_WRITE;
}
xuio.uio_offset = beio->io_offset;
xuio.uio_resid = beio->io_len;
xuio.uio_segflg = UIO_SYSSPACE;
xuio.uio_iov = beio->xiovecs;
xuio.uio_iovcnt = beio->num_segs;
xuio.uio_td = curthread;
for (i = 0, xiovec = xuio.uio_iov; i < xuio.uio_iovcnt; i++, xiovec++) {
xiovec->iov_base = beio->sg_segs[i].addr;
xiovec->iov_len = beio->sg_segs[i].len;
}
binuptime(&beio->ds_t0);
devstat_start_transaction(beio->lun->disk_stats, &beio->ds_t0);
if (beio->bio_cmd == BIO_READ) {
vn_lock(be_lun->vn, LK_SHARED | LK_RETRY);
if (beio->beio_cont == NULL &&
cbe_lun->serseq == CTL_LUN_SERSEQ_SOFT)
ctl_serseq_done(io);
/*
* UFS pays attention to IO_DIRECT for reads. If the
* DIRECTIO option is configured into the kernel, it calls
* ffs_rawread(). But that only works for single-segment
* uios with user space addresses. In our case, with a
* kernel uio, it still reads into the buffer cache, but it
* will just try to release the buffer from the cache later
* on in ffs_read().
*
* ZFS does not pay attention to IO_DIRECT for reads.
*
* UFS does not pay attention to IO_SYNC for reads.
*
* ZFS pays attention to IO_SYNC (which translates into the
* Solaris define FRSYNC for zfs_read()) for reads. It
* attempts to sync the file before reading.
*/
error = VOP_READ(be_lun->vn, &xuio, flags, file_data->cred);
VOP_UNLOCK(be_lun->vn);
SDT_PROBE0(cbb, , read, file_done);
if (error == 0 && xuio.uio_resid > 0) {
/*
* If we red less then requested (EOF), then
* we should clean the rest of the buffer.
*/
s = beio->io_len - xuio.uio_resid;
for (i = 0; i < beio->num_segs; i++) {
if (s >= beio->sg_segs[i].len) {
s -= beio->sg_segs[i].len;
continue;
}
bzero((uint8_t *)beio->sg_segs[i].addr + s,
beio->sg_segs[i].len - s);
s = 0;
}
}
} else {
struct mount *mountpoint;
(void)vn_start_write(be_lun->vn, &mountpoint, V_WAIT);
vn_lock(be_lun->vn, vn_lktype_write(mountpoint,
be_lun->vn) | LK_RETRY);
/*
* UFS pays attention to IO_DIRECT for writes. The write
* is done asynchronously. (Normally the write would just
* get put into cache.
*
* UFS pays attention to IO_SYNC for writes. It will
* attempt to write the buffer out synchronously if that
* flag is set.
*
* ZFS does not pay attention to IO_DIRECT for writes.
*
* ZFS pays attention to IO_SYNC (a.k.a. FSYNC or FRSYNC)
* for writes. It will flush the transaction from the
* cache before returning.
*/
error = VOP_WRITE(be_lun->vn, &xuio, flags, file_data->cred);
VOP_UNLOCK(be_lun->vn);
vn_finished_write(mountpoint);
SDT_PROBE0(cbb, , write, file_done);
}
mtx_lock(&be_lun->io_lock);
devstat_end_transaction(beio->lun->disk_stats, beio->io_len,
beio->ds_tag_type, beio->ds_trans_type,
/*now*/ NULL, /*then*/&beio->ds_t0);
mtx_unlock(&be_lun->io_lock);
/*
* If we got an error, set the sense data to "MEDIUM ERROR" and
* return the I/O to the user.
*/
if (error != 0) {
if (error == ENOSPC || error == EDQUOT) {
ctl_set_space_alloc_fail(&io->scsiio);
} else if (error == EROFS || error == EACCES) {
ctl_set_hw_write_protected(&io->scsiio);
} else {
ctl_set_medium_error(&io->scsiio,
beio->bio_cmd == BIO_READ);
}
ctl_complete_beio(beio);
return;
}
/*
* If this is a write or a verify, we're all done.
* If this is a read, we can now send the data to the user.
*/
if ((beio->bio_cmd == BIO_WRITE) ||
(ARGS(io)->flags & CTL_LLF_VERIFY)) {
ctl_set_success(&io->scsiio);
ctl_complete_beio(beio);
} else {
if ((ARGS(io)->flags & CTL_LLF_READ) &&
beio->beio_cont == NULL) {
ctl_set_success(&io->scsiio);
if (cbe_lun->serseq > CTL_LUN_SERSEQ_SOFT)
ctl_serseq_done(io);
}
ctl_datamove(io);
}
}
static void
ctl_be_block_gls_file(struct ctl_be_block_lun *be_lun,
struct ctl_be_block_io *beio)
{
union ctl_io *io = beio->io;
struct ctl_lba_len_flags *lbalen = ARGS(io);
struct scsi_get_lba_status_data *data;
off_t roff, off;
int error, status;
DPRINTF("entered\n");
off = roff = ((off_t)lbalen->lba) * be_lun->cbe_lun.blocksize;
vn_lock(be_lun->vn, LK_SHARED | LK_RETRY);
error = VOP_IOCTL(be_lun->vn, FIOSEEKHOLE, &off,
0, curthread->td_ucred, curthread);
if (error == 0 && off > roff)
status = 0; /* mapped up to off */
else {
error = VOP_IOCTL(be_lun->vn, FIOSEEKDATA, &off,
0, curthread->td_ucred, curthread);
if (error == 0 && off > roff)
status = 1; /* deallocated up to off */
else {
status = 0; /* unknown up to the end */
off = be_lun->size_bytes;
}
}
VOP_UNLOCK(be_lun->vn);
data = (struct scsi_get_lba_status_data *)io->scsiio.kern_data_ptr;
scsi_u64to8b(lbalen->lba, data->descr[0].addr);
scsi_ulto4b(MIN(UINT32_MAX, off / be_lun->cbe_lun.blocksize -
lbalen->lba), data->descr[0].length);
data->descr[0].status = status;
ctl_complete_beio(beio);
}
static uint64_t
ctl_be_block_getattr_file(struct ctl_be_block_lun *be_lun, const char *attrname)
{
struct vattr vattr;
struct statfs statfs;
uint64_t val;
int error;
val = UINT64_MAX;
if (be_lun->vn == NULL)
return (val);
vn_lock(be_lun->vn, LK_SHARED | LK_RETRY);
if (strcmp(attrname, "blocksused") == 0) {
error = VOP_GETATTR(be_lun->vn, &vattr, curthread->td_ucred);
if (error == 0)
val = vattr.va_bytes / be_lun->cbe_lun.blocksize;
}
if (strcmp(attrname, "blocksavail") == 0 &&
!VN_IS_DOOMED(be_lun->vn)) {
error = VFS_STATFS(be_lun->vn->v_mount, &statfs);
if (error == 0)
val = statfs.f_bavail * statfs.f_bsize /
be_lun->cbe_lun.blocksize;
}
VOP_UNLOCK(be_lun->vn);
return (val);
}
static void
ctl_be_block_dispatch_zvol(struct ctl_be_block_lun *be_lun,
struct ctl_be_block_io *beio)
{
struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun;
union ctl_io *io;
struct cdevsw *csw;
struct cdev *dev;
struct uio xuio;
struct iovec *xiovec;
int error, flags, i, ref;
DPRINTF("entered\n");
io = beio->io;
flags = 0;
if (ARGS(io)->flags & CTL_LLF_DPO)
flags |= IO_DIRECT;
if (beio->bio_cmd == BIO_WRITE && ARGS(io)->flags & CTL_LLF_FUA)
flags |= IO_SYNC;
bzero(&xuio, sizeof(xuio));
if (beio->bio_cmd == BIO_READ) {
SDT_PROBE0(cbb, , read, file_start);
xuio.uio_rw = UIO_READ;
} else {
SDT_PROBE0(cbb, , write, file_start);
xuio.uio_rw = UIO_WRITE;
}
xuio.uio_offset = beio->io_offset;
xuio.uio_resid = beio->io_len;
xuio.uio_segflg = UIO_SYSSPACE;
xuio.uio_iov = beio->xiovecs;
xuio.uio_iovcnt = beio->num_segs;
xuio.uio_td = curthread;
for (i = 0, xiovec = xuio.uio_iov; i < xuio.uio_iovcnt; i++, xiovec++) {
xiovec->iov_base = beio->sg_segs[i].addr;
xiovec->iov_len = beio->sg_segs[i].len;
}
binuptime(&beio->ds_t0);
devstat_start_transaction(beio->lun->disk_stats, &beio->ds_t0);
csw = devvn_refthread(be_lun->vn, &dev, &ref);
if (csw) {
if (beio->bio_cmd == BIO_READ) {
if (beio->beio_cont == NULL &&
cbe_lun->serseq == CTL_LUN_SERSEQ_SOFT)
ctl_serseq_done(io);
error = csw->d_read(dev, &xuio, flags);
} else
error = csw->d_write(dev, &xuio, flags);
dev_relthread(dev, ref);
} else
error = ENXIO;
if (beio->bio_cmd == BIO_READ)
SDT_PROBE0(cbb, , read, file_done);
else
SDT_PROBE0(cbb, , write, file_done);
mtx_lock(&be_lun->io_lock);
devstat_end_transaction(beio->lun->disk_stats, beio->io_len,
beio->ds_tag_type, beio->ds_trans_type,
/*now*/ NULL, /*then*/&beio->ds_t0);
mtx_unlock(&be_lun->io_lock);
/*
* If we got an error, set the sense data to "MEDIUM ERROR" and
* return the I/O to the user.
*/
if (error != 0) {
if (error == ENOSPC || error == EDQUOT) {
ctl_set_space_alloc_fail(&io->scsiio);
} else if (error == EROFS || error == EACCES) {
ctl_set_hw_write_protected(&io->scsiio);
} else {
ctl_set_medium_error(&io->scsiio,
beio->bio_cmd == BIO_READ);
}
ctl_complete_beio(beio);
return;
}
/*
* If this is a write or a verify, we're all done.
* If this is a read, we can now send the data to the user.
*/
if ((beio->bio_cmd == BIO_WRITE) ||
(ARGS(io)->flags & CTL_LLF_VERIFY)) {
ctl_set_success(&io->scsiio);
ctl_complete_beio(beio);
} else {
if ((ARGS(io)->flags & CTL_LLF_READ) &&
beio->beio_cont == NULL) {
ctl_set_success(&io->scsiio);
if (cbe_lun->serseq > CTL_LUN_SERSEQ_SOFT)
ctl_serseq_done(io);
}
ctl_datamove(io);
}
}
static void
ctl_be_block_gls_zvol(struct ctl_be_block_lun *be_lun,
struct ctl_be_block_io *beio)
{
union ctl_io *io = beio->io;
struct cdevsw *csw;
struct cdev *dev;
struct ctl_lba_len_flags *lbalen = ARGS(io);
struct scsi_get_lba_status_data *data;
off_t roff, off;
int error, ref, status;
DPRINTF("entered\n");
csw = devvn_refthread(be_lun->vn, &dev, &ref);
if (csw == NULL) {
status = 0; /* unknown up to the end */
off = be_lun->size_bytes;
goto done;
}
off = roff = ((off_t)lbalen->lba) * be_lun->cbe_lun.blocksize;
error = csw->d_ioctl(dev, FIOSEEKHOLE, (caddr_t)&off, FREAD,
curthread);
if (error == 0 && off > roff)
status = 0; /* mapped up to off */
else {
error = csw->d_ioctl(dev, FIOSEEKDATA, (caddr_t)&off, FREAD,
curthread);
if (error == 0 && off > roff)
status = 1; /* deallocated up to off */
else {
status = 0; /* unknown up to the end */
off = be_lun->size_bytes;
}
}
dev_relthread(dev, ref);
done:
data = (struct scsi_get_lba_status_data *)io->scsiio.kern_data_ptr;
scsi_u64to8b(lbalen->lba, data->descr[0].addr);
scsi_ulto4b(MIN(UINT32_MAX, off / be_lun->cbe_lun.blocksize -
lbalen->lba), data->descr[0].length);
data->descr[0].status = status;
ctl_complete_beio(beio);
}
static void
ctl_be_block_flush_dev(struct ctl_be_block_lun *be_lun,
struct ctl_be_block_io *beio)
{
struct bio *bio;
struct cdevsw *csw;
struct cdev *dev;
int ref;
DPRINTF("entered\n");
/* This can't fail, it's a blocking allocation. */
bio = g_alloc_bio();
bio->bio_cmd = BIO_FLUSH;
bio->bio_offset = 0;
bio->bio_data = 0;
bio->bio_done = ctl_be_block_biodone;
bio->bio_caller1 = beio;
bio->bio_pblkno = 0;
/*
* We don't need to acquire the LUN lock here, because we are only
* sending one bio, and so there is no other context to synchronize
* with.
*/
beio->num_bios_sent = 1;
beio->send_complete = 1;
binuptime(&beio->ds_t0);
devstat_start_transaction(be_lun->disk_stats, &beio->ds_t0);
csw = devvn_refthread(be_lun->vn, &dev, &ref);
if (csw) {
bio->bio_dev = dev;
csw->d_strategy(bio);
dev_relthread(dev, ref);
} else {
bio->bio_error = ENXIO;
ctl_be_block_biodone(bio);
}
}
static void
ctl_be_block_unmap_dev_range(struct ctl_be_block_lun *be_lun,
struct ctl_be_block_io *beio,
uint64_t off, uint64_t len, int last)
{
struct bio *bio;
uint64_t maxlen;
struct cdevsw *csw;
struct cdev *dev;
int ref;
csw = devvn_refthread(be_lun->vn, &dev, &ref);
maxlen = LONG_MAX - (LONG_MAX % be_lun->cbe_lun.blocksize);
while (len > 0) {
bio = g_alloc_bio();
bio->bio_cmd = BIO_DELETE;
bio->bio_dev = dev;
bio->bio_offset = off;
bio->bio_length = MIN(len, maxlen);
bio->bio_data = 0;
bio->bio_done = ctl_be_block_biodone;
bio->bio_caller1 = beio;
bio->bio_pblkno = off / be_lun->cbe_lun.blocksize;
off += bio->bio_length;
len -= bio->bio_length;
mtx_lock(&be_lun->io_lock);
beio->num_bios_sent++;
if (last && len == 0)
beio->send_complete = 1;
mtx_unlock(&be_lun->io_lock);
if (csw) {
csw->d_strategy(bio);
} else {
bio->bio_error = ENXIO;
ctl_be_block_biodone(bio);
}
}
if (csw)
dev_relthread(dev, ref);
}
static void
ctl_be_block_unmap_dev(struct ctl_be_block_lun *be_lun,
struct ctl_be_block_io *beio)
{
union ctl_io *io;
struct ctl_ptr_len_flags *ptrlen;
struct scsi_unmap_desc *buf, *end;
uint64_t len;
io = beio->io;
DPRINTF("entered\n");
binuptime(&beio->ds_t0);
devstat_start_transaction(be_lun->disk_stats, &beio->ds_t0);
if (beio->io_offset == -1) {
beio->io_len = 0;
ptrlen = (struct ctl_ptr_len_flags *)&io->io_hdr.ctl_private[CTL_PRIV_LBA_LEN];
buf = (struct scsi_unmap_desc *)ptrlen->ptr;
end = buf + ptrlen->len / sizeof(*buf);
for (; buf < end; buf++) {
len = (uint64_t)scsi_4btoul(buf->length) *
be_lun->cbe_lun.blocksize;
beio->io_len += len;
ctl_be_block_unmap_dev_range(be_lun, beio,
scsi_8btou64(buf->lba) * be_lun->cbe_lun.blocksize,
len, (end - buf < 2) ? TRUE : FALSE);
}
} else
ctl_be_block_unmap_dev_range(be_lun, beio,
beio->io_offset, beio->io_len, TRUE);
}
static void
ctl_be_block_dispatch_dev(struct ctl_be_block_lun *be_lun,
struct ctl_be_block_io *beio)
{
TAILQ_HEAD(, bio) queue = TAILQ_HEAD_INITIALIZER(queue);
struct bio *bio;
struct cdevsw *csw;
struct cdev *dev;
off_t cur_offset;
int i, max_iosize, ref;
DPRINTF("entered\n");
csw = devvn_refthread(be_lun->vn, &dev, &ref);
/*
* We have to limit our I/O size to the maximum supported by the
* backend device.
*/
if (csw) {
max_iosize = dev->si_iosize_max;
if (max_iosize < PAGE_SIZE)
max_iosize = DFLTPHYS;
} else
max_iosize = DFLTPHYS;
cur_offset = beio->io_offset;
for (i = 0; i < beio->num_segs; i++) {
size_t cur_size;
uint8_t *cur_ptr;
cur_size = beio->sg_segs[i].len;
cur_ptr = beio->sg_segs[i].addr;
while (cur_size > 0) {
/* This can't fail, it's a blocking allocation. */
bio = g_alloc_bio();
KASSERT(bio != NULL, ("g_alloc_bio() failed!\n"));
bio->bio_cmd = beio->bio_cmd;
bio->bio_dev = dev;
bio->bio_caller1 = beio;
bio->bio_length = min(cur_size, max_iosize);
bio->bio_offset = cur_offset;
bio->bio_data = cur_ptr;
bio->bio_done = ctl_be_block_biodone;
bio->bio_pblkno = cur_offset / be_lun->cbe_lun.blocksize;
cur_offset += bio->bio_length;
cur_ptr += bio->bio_length;
cur_size -= bio->bio_length;
TAILQ_INSERT_TAIL(&queue, bio, bio_queue);
beio->num_bios_sent++;
}
}
beio->send_complete = 1;
binuptime(&beio->ds_t0);
devstat_start_transaction(be_lun->disk_stats, &beio->ds_t0);
/*
* Fire off all allocated requests!
*/
while ((bio = TAILQ_FIRST(&queue)) != NULL) {
TAILQ_REMOVE(&queue, bio, bio_queue);
if (csw)
csw->d_strategy(bio);
else {
bio->bio_error = ENXIO;
ctl_be_block_biodone(bio);
}
}
if (csw)
dev_relthread(dev, ref);
}
static uint64_t
ctl_be_block_getattr_dev(struct ctl_be_block_lun *be_lun, const char *attrname)
{
struct diocgattr_arg arg;
struct cdevsw *csw;
struct cdev *dev;
int error, ref;
csw = devvn_refthread(be_lun->vn, &dev, &ref);
if (csw == NULL)
return (UINT64_MAX);
strlcpy(arg.name, attrname, sizeof(arg.name));
arg.len = sizeof(arg.value.off);
if (csw->d_ioctl) {
error = csw->d_ioctl(dev, DIOCGATTR, (caddr_t)&arg, FREAD,
curthread);
} else
error = ENODEV;
dev_relthread(dev, ref);
if (error != 0)
return (UINT64_MAX);
return (arg.value.off);
}
static void
ctl_be_block_cw_dispatch_sync(struct ctl_be_block_lun *be_lun,
union ctl_io *io)
{
struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun;
struct ctl_be_block_io *beio;
struct ctl_lba_len_flags *lbalen;
DPRINTF("entered\n");
beio = (struct ctl_be_block_io *)PRIV(io)->ptr;
lbalen = (struct ctl_lba_len_flags *)&io->io_hdr.ctl_private[CTL_PRIV_LBA_LEN];
beio->io_len = lbalen->len * cbe_lun->blocksize;
beio->io_offset = lbalen->lba * cbe_lun->blocksize;
beio->io_arg = (lbalen->flags & SSC_IMMED) != 0;
beio->bio_cmd = BIO_FLUSH;
beio->ds_trans_type = DEVSTAT_NO_DATA;
DPRINTF("SYNC\n");
be_lun->lun_flush(be_lun, beio);
}
static void
ctl_be_block_cw_done_ws(struct ctl_be_block_io *beio)
{
union ctl_io *io;
io = beio->io;
ctl_free_beio(beio);
if ((io->io_hdr.flags & CTL_FLAG_ABORT) ||
((io->io_hdr.status & CTL_STATUS_MASK) != CTL_STATUS_NONE &&
(io->io_hdr.status & CTL_STATUS_MASK) != CTL_SUCCESS)) {
ctl_config_write_done(io);
return;
}
ctl_be_block_config_write(io);
}
static void
ctl_be_block_cw_dispatch_ws(struct ctl_be_block_lun *be_lun,
union ctl_io *io)
{
struct ctl_be_block_softc *softc = be_lun->softc;
struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun;
struct ctl_be_block_io *beio;
struct ctl_lba_len_flags *lbalen;
uint64_t len_left, lba;
uint32_t pb, pbo, adj;
int i, seglen;
uint8_t *buf, *end;
DPRINTF("entered\n");
beio = (struct ctl_be_block_io *)PRIV(io)->ptr;
lbalen = ARGS(io);
if (lbalen->flags & ~(SWS_LBDATA | SWS_UNMAP | SWS_ANCHOR | SWS_NDOB) ||
(lbalen->flags & (SWS_UNMAP | SWS_ANCHOR) && be_lun->unmap == NULL)) {
ctl_free_beio(beio);
ctl_set_invalid_field(&io->scsiio,
/*sks_valid*/ 1,
/*command*/ 1,
/*field*/ 1,
/*bit_valid*/ 0,
/*bit*/ 0);
ctl_config_write_done(io);
return;
}
if (lbalen->flags & (SWS_UNMAP | SWS_ANCHOR)) {
beio->io_offset = lbalen->lba * cbe_lun->blocksize;
beio->io_len = (uint64_t)lbalen->len * cbe_lun->blocksize;
beio->bio_cmd = BIO_DELETE;
beio->ds_trans_type = DEVSTAT_FREE;
be_lun->unmap(be_lun, beio);
return;
}
beio->bio_cmd = BIO_WRITE;
beio->ds_trans_type = DEVSTAT_WRITE;
DPRINTF("WRITE SAME at LBA %jx len %u\n",
(uintmax_t)lbalen->lba, lbalen->len);
pb = cbe_lun->blocksize << be_lun->cbe_lun.pblockexp;
if (be_lun->cbe_lun.pblockoff > 0)
pbo = pb - cbe_lun->blocksize * be_lun->cbe_lun.pblockoff;
else
pbo = 0;
len_left = (uint64_t)lbalen->len * cbe_lun->blocksize;
for (i = 0, lba = 0; i < CTLBLK_NUM_SEGS && len_left > 0; i++) {
/*
* Setup the S/G entry for this chunk.
*/
seglen = MIN(CTLBLK_MAX_SEG, len_left);
if (pb > cbe_lun->blocksize) {
adj = ((lbalen->lba + lba) * cbe_lun->blocksize +
seglen - pbo) % pb;
if (seglen > adj)
seglen -= adj;
else
seglen -= seglen % cbe_lun->blocksize;
} else
seglen -= seglen % cbe_lun->blocksize;
ctl_alloc_seg(softc, &beio->sg_segs[i], seglen);
DPRINTF("segment %d addr %p len %zd\n", i,
beio->sg_segs[i].addr, beio->sg_segs[i].len);
beio->num_segs++;
len_left -= seglen;
buf = beio->sg_segs[i].addr;
end = buf + seglen;
for (; buf < end; buf += cbe_lun->blocksize) {
if (lbalen->flags & SWS_NDOB) {
memset(buf, 0, cbe_lun->blocksize);
} else {
memcpy(buf, io->scsiio.kern_data_ptr,
cbe_lun->blocksize);
}
if (lbalen->flags & SWS_LBDATA)
scsi_ulto4b(lbalen->lba + lba, buf);
lba++;
}
}
beio->io_offset = lbalen->lba * cbe_lun->blocksize;
beio->io_len = lba * cbe_lun->blocksize;
/* We can not do all in one run. Correct and schedule rerun. */
if (len_left > 0) {
lbalen->lba += lba;
lbalen->len -= lba;
beio->beio_cont = ctl_be_block_cw_done_ws;
}
be_lun->dispatch(be_lun, beio);
}
static void
ctl_be_block_cw_dispatch_unmap(struct ctl_be_block_lun *be_lun,
union ctl_io *io)
{
struct ctl_be_block_io *beio;
struct ctl_ptr_len_flags *ptrlen;
DPRINTF("entered\n");
beio = (struct ctl_be_block_io *)PRIV(io)->ptr;
ptrlen = (struct ctl_ptr_len_flags *)&io->io_hdr.ctl_private[CTL_PRIV_LBA_LEN];
if ((ptrlen->flags & ~SU_ANCHOR) != 0 || be_lun->unmap == NULL) {
ctl_free_beio(beio);
ctl_set_invalid_field(&io->scsiio,
/*sks_valid*/ 0,
/*command*/ 1,
/*field*/ 0,
/*bit_valid*/ 0,
/*bit*/ 0);
ctl_config_write_done(io);
return;
}
beio->io_len = 0;
beio->io_offset = -1;
beio->bio_cmd = BIO_DELETE;
beio->ds_trans_type = DEVSTAT_FREE;
DPRINTF("UNMAP\n");
be_lun->unmap(be_lun, beio);
}
static void
ctl_be_block_cr_done(struct ctl_be_block_io *beio)
{
union ctl_io *io;
io = beio->io;
ctl_free_beio(beio);
ctl_config_read_done(io);
}
static void
ctl_be_block_cr_dispatch(struct ctl_be_block_lun *be_lun,
union ctl_io *io)
{
struct ctl_be_block_io *beio;
struct ctl_be_block_softc *softc;
DPRINTF("entered\n");
softc = be_lun->softc;
beio = ctl_alloc_beio(softc);
beio->io = io;
beio->lun = be_lun;
beio->beio_cont = ctl_be_block_cr_done;
PRIV(io)->ptr = (void *)beio;
switch (io->scsiio.cdb[0]) {
case SERVICE_ACTION_IN: /* GET LBA STATUS */
beio->bio_cmd = -1;
beio->ds_trans_type = DEVSTAT_NO_DATA;
beio->ds_tag_type = DEVSTAT_TAG_ORDERED;
beio->io_len = 0;
if (be_lun->get_lba_status)
be_lun->get_lba_status(be_lun, beio);
else
ctl_be_block_cr_done(beio);
break;
default:
panic("Unhandled CDB type %#x", io->scsiio.cdb[0]);
break;
}
}
static void
ctl_be_block_cw_done(struct ctl_be_block_io *beio)
{
union ctl_io *io;
io = beio->io;
ctl_free_beio(beio);
ctl_config_write_done(io);
}
static void
ctl_be_block_cw_dispatch(struct ctl_be_block_lun *be_lun,
union ctl_io *io)
{
struct ctl_be_block_io *beio;
struct ctl_be_block_softc *softc;
DPRINTF("entered\n");
softc = be_lun->softc;
beio = ctl_alloc_beio(softc);
beio->io = io;
beio->lun = be_lun;
beio->beio_cont = ctl_be_block_cw_done;
switch (io->scsiio.tag_type) {
case CTL_TAG_ORDERED:
beio->ds_tag_type = DEVSTAT_TAG_ORDERED;
break;
case CTL_TAG_HEAD_OF_QUEUE:
beio->ds_tag_type = DEVSTAT_TAG_HEAD;
break;
case CTL_TAG_UNTAGGED:
case CTL_TAG_SIMPLE:
case CTL_TAG_ACA:
default:
beio->ds_tag_type = DEVSTAT_TAG_SIMPLE;
break;
}
PRIV(io)->ptr = (void *)beio;
switch (io->scsiio.cdb[0]) {
case SYNCHRONIZE_CACHE:
case SYNCHRONIZE_CACHE_16:
ctl_be_block_cw_dispatch_sync(be_lun, io);
break;
case WRITE_SAME_10:
case WRITE_SAME_16:
ctl_be_block_cw_dispatch_ws(be_lun, io);
break;
case UNMAP:
ctl_be_block_cw_dispatch_unmap(be_lun, io);
break;
default:
panic("Unhandled CDB type %#x", io->scsiio.cdb[0]);
break;
}
}
SDT_PROBE_DEFINE1(cbb, , read, start, "uint64_t");
SDT_PROBE_DEFINE1(cbb, , write, start, "uint64_t");
SDT_PROBE_DEFINE1(cbb, , read, alloc_done, "uint64_t");
SDT_PROBE_DEFINE1(cbb, , write, alloc_done, "uint64_t");
static void
ctl_be_block_next(struct ctl_be_block_io *beio)
{
struct ctl_be_block_lun *be_lun;
union ctl_io *io;
io = beio->io;
be_lun = beio->lun;
ctl_free_beio(beio);
if ((io->io_hdr.flags & CTL_FLAG_ABORT) ||
((io->io_hdr.status & CTL_STATUS_MASK) != CTL_STATUS_NONE &&
(io->io_hdr.status & CTL_STATUS_MASK) != CTL_SUCCESS)) {
ctl_data_submit_done(io);
return;
}
io->io_hdr.status &= ~CTL_STATUS_MASK;
io->io_hdr.status |= CTL_STATUS_NONE;
mtx_lock(&be_lun->queue_lock);
STAILQ_INSERT_TAIL(&be_lun->input_queue, &io->io_hdr, links);
mtx_unlock(&be_lun->queue_lock);
taskqueue_enqueue(be_lun->io_taskqueue, &be_lun->io_task);
}
static void
ctl_be_block_dispatch(struct ctl_be_block_lun *be_lun,
union ctl_io *io)
{
struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun;
struct ctl_be_block_io *beio;
struct ctl_be_block_softc *softc;
struct ctl_lba_len_flags *lbalen;
struct ctl_ptr_len_flags *bptrlen;
uint64_t len_left, lbas;
int i;
softc = be_lun->softc;
DPRINTF("entered\n");
lbalen = ARGS(io);
if (lbalen->flags & CTL_LLF_WRITE) {
SDT_PROBE0(cbb, , write, start);
} else {
SDT_PROBE0(cbb, , read, start);
}
beio = ctl_alloc_beio(softc);
beio->io = io;
beio->lun = be_lun;
bptrlen = PRIV(io);
bptrlen->ptr = (void *)beio;
switch (io->scsiio.tag_type) {
case CTL_TAG_ORDERED:
beio->ds_tag_type = DEVSTAT_TAG_ORDERED;
break;
case CTL_TAG_HEAD_OF_QUEUE:
beio->ds_tag_type = DEVSTAT_TAG_HEAD;
break;
case CTL_TAG_UNTAGGED:
case CTL_TAG_SIMPLE:
case CTL_TAG_ACA:
default:
beio->ds_tag_type = DEVSTAT_TAG_SIMPLE;
break;
}
if (lbalen->flags & CTL_LLF_WRITE) {
beio->bio_cmd = BIO_WRITE;
beio->ds_trans_type = DEVSTAT_WRITE;
} else {
beio->bio_cmd = BIO_READ;
beio->ds_trans_type = DEVSTAT_READ;
}
DPRINTF("%s at LBA %jx len %u @%ju\n",
(beio->bio_cmd == BIO_READ) ? "READ" : "WRITE",
(uintmax_t)lbalen->lba, lbalen->len, bptrlen->len);
if (lbalen->flags & CTL_LLF_COMPARE) {
beio->two_sglists = 1;
lbas = CTLBLK_HALF_IO_SIZE;
} else {
lbas = CTLBLK_MAX_IO_SIZE;
}
lbas = MIN(lbalen->len - bptrlen->len, lbas / cbe_lun->blocksize);
beio->io_offset = (lbalen->lba + bptrlen->len) * cbe_lun->blocksize;
beio->io_len = lbas * cbe_lun->blocksize;
bptrlen->len += lbas;
for (i = 0, len_left = beio->io_len; len_left > 0; i++) {
KASSERT(i < CTLBLK_MAX_SEGS, ("Too many segs (%d >= %d)",
i, CTLBLK_MAX_SEGS));
/*
* Setup the S/G entry for this chunk.
*/
ctl_alloc_seg(softc, &beio->sg_segs[i],
MIN(CTLBLK_MAX_SEG, len_left));
DPRINTF("segment %d addr %p len %zd\n", i,
beio->sg_segs[i].addr, beio->sg_segs[i].len);
/* Set up second segment for compare operation. */
if (beio->two_sglists) {
ctl_alloc_seg(softc,
&beio->sg_segs[i + CTLBLK_HALF_SEGS],
beio->sg_segs[i].len);
}
beio->num_segs++;
len_left -= beio->sg_segs[i].len;
}
if (bptrlen->len < lbalen->len)
beio->beio_cont = ctl_be_block_next;
io->scsiio.be_move_done = ctl_be_block_move_done;
/* For compare we have separate S/G lists for read and datamove. */
if (beio->two_sglists)
io->scsiio.kern_data_ptr = (uint8_t *)&beio->sg_segs[CTLBLK_HALF_SEGS];
else
io->scsiio.kern_data_ptr = (uint8_t *)beio->sg_segs;
io->scsiio.kern_data_len = beio->io_len;
io->scsiio.kern_sg_entries = beio->num_segs;
io->scsiio.kern_data_ref = ctl_refcnt_beio;
io->scsiio.kern_data_arg = beio;
io->io_hdr.flags |= CTL_FLAG_ALLOCATED;
/*
* For the read case, we need to read the data into our buffers and
* then we can send it back to the user. For the write case, we
* need to get the data from the user first.
*/
if (beio->bio_cmd == BIO_READ) {
SDT_PROBE0(cbb, , read, alloc_done);
be_lun->dispatch(be_lun, beio);
} else {
SDT_PROBE0(cbb, , write, alloc_done);
ctl_datamove(io);
}
}
static void
ctl_be_block_worker(void *context, int pending)
{
struct ctl_be_block_lun *be_lun = (struct ctl_be_block_lun *)context;
struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun;
union ctl_io *io;
struct ctl_be_block_io *beio;
DPRINTF("entered\n");
/*
* Fetch and process I/Os from all queues. If we detect LUN
* CTL_LUN_FLAG_NO_MEDIA status here -- it is result of a race,
* so make response maximally opaque to not confuse initiator.
*/
for (;;) {
mtx_lock(&be_lun->queue_lock);
io = (union ctl_io *)STAILQ_FIRST(&be_lun->datamove_queue);
if (io != NULL) {
DPRINTF("datamove queue\n");
STAILQ_REMOVE_HEAD(&be_lun->datamove_queue, links);
mtx_unlock(&be_lun->queue_lock);
beio = (struct ctl_be_block_io *)PRIV(io)->ptr;
if (cbe_lun->flags & CTL_LUN_FLAG_NO_MEDIA) {
ctl_set_busy(&io->scsiio);
ctl_complete_beio(beio);
continue;
}
be_lun->dispatch(be_lun, beio);
continue;
}
io = (union ctl_io *)STAILQ_FIRST(&be_lun->config_write_queue);
if (io != NULL) {
DPRINTF("config write queue\n");
STAILQ_REMOVE_HEAD(&be_lun->config_write_queue, links);
mtx_unlock(&be_lun->queue_lock);
if (cbe_lun->flags & CTL_LUN_FLAG_NO_MEDIA) {
ctl_set_busy(&io->scsiio);
ctl_config_write_done(io);
continue;
}
ctl_be_block_cw_dispatch(be_lun, io);
continue;
}
io = (union ctl_io *)STAILQ_FIRST(&be_lun->config_read_queue);
if (io != NULL) {
DPRINTF("config read queue\n");
STAILQ_REMOVE_HEAD(&be_lun->config_read_queue, links);
mtx_unlock(&be_lun->queue_lock);
if (cbe_lun->flags & CTL_LUN_FLAG_NO_MEDIA) {
ctl_set_busy(&io->scsiio);
ctl_config_read_done(io);
continue;
}
ctl_be_block_cr_dispatch(be_lun, io);
continue;
}
io = (union ctl_io *)STAILQ_FIRST(&be_lun->input_queue);
if (io != NULL) {
DPRINTF("input queue\n");
STAILQ_REMOVE_HEAD(&be_lun->input_queue, links);
mtx_unlock(&be_lun->queue_lock);
if (cbe_lun->flags & CTL_LUN_FLAG_NO_MEDIA) {
ctl_set_busy(&io->scsiio);
ctl_data_submit_done(io);
continue;
}
ctl_be_block_dispatch(be_lun, io);
continue;
}
/*
* If we get here, there is no work left in the queues, so
* just break out and let the task queue go to sleep.
*/
mtx_unlock(&be_lun->queue_lock);
break;
}
}
/*
* Entry point from CTL to the backend for I/O. We queue everything to a
* work thread, so this just puts the I/O on a queue and wakes up the
* thread.
*/
static int
ctl_be_block_submit(union ctl_io *io)
{
struct ctl_be_block_lun *be_lun;
DPRINTF("entered\n");
be_lun = (struct ctl_be_block_lun *)CTL_BACKEND_LUN(io);
KASSERT(io->io_hdr.io_type == CTL_IO_SCSI,
("%s: unexpected I/O type %x", __func__, io->io_hdr.io_type));
PRIV(io)->len = 0;
mtx_lock(&be_lun->queue_lock);
STAILQ_INSERT_TAIL(&be_lun->input_queue, &io->io_hdr, links);
mtx_unlock(&be_lun->queue_lock);
taskqueue_enqueue(be_lun->io_taskqueue, &be_lun->io_task);
return (CTL_RETVAL_COMPLETE);
}
static int
ctl_be_block_ioctl(struct cdev *dev, u_long cmd, caddr_t addr,
int flag, struct thread *td)
{
struct ctl_be_block_softc *softc = &backend_block_softc;
int error;
error = 0;
switch (cmd) {
case CTL_LUN_REQ: {
struct ctl_lun_req *lun_req;
lun_req = (struct ctl_lun_req *)addr;
switch (lun_req->reqtype) {
case CTL_LUNREQ_CREATE:
error = ctl_be_block_create(softc, lun_req);
break;
case CTL_LUNREQ_RM:
error = ctl_be_block_rm(softc, lun_req);
break;
case CTL_LUNREQ_MODIFY:
error = ctl_be_block_modify(softc, lun_req);
break;
default:
lun_req->status = CTL_LUN_ERROR;
snprintf(lun_req->error_str, sizeof(lun_req->error_str),
"invalid LUN request type %d",
lun_req->reqtype);
break;
}
break;
}
default:
error = ENOTTY;
break;
}
return (error);
}
static int
ctl_be_block_open_file(struct ctl_be_block_lun *be_lun, struct ctl_lun_req *req)
{
struct ctl_be_lun *cbe_lun;
struct ctl_be_block_filedata *file_data;
struct ctl_lun_create_params *params;
const char *value;
struct vattr vattr;
off_t ps, pss, po, pos, us, uss, uo, uos;
int error;
cbe_lun = &be_lun->cbe_lun;
file_data = &be_lun->backend.file;
params = &be_lun->params;
be_lun->dev_type = CTL_BE_BLOCK_FILE;
be_lun->dispatch = ctl_be_block_dispatch_file;
be_lun->lun_flush = ctl_be_block_flush_file;
be_lun->get_lba_status = ctl_be_block_gls_file;
be_lun->getattr = ctl_be_block_getattr_file;
be_lun->unmap = NULL;
cbe_lun->flags &= ~CTL_LUN_FLAG_UNMAP;
error = VOP_GETATTR(be_lun->vn, &vattr, curthread->td_ucred);
if (error != 0) {
snprintf(req->error_str, sizeof(req->error_str),
"error calling VOP_GETATTR() for file %s",
be_lun->dev_path);
return (error);
}
file_data->cred = crhold(curthread->td_ucred);
if (params->lun_size_bytes != 0)
be_lun->size_bytes = params->lun_size_bytes;
else
be_lun->size_bytes = vattr.va_size;
/*
* For files we can use any logical block size. Prefer 512 bytes
* for compatibility reasons. If file's vattr.va_blocksize
* (preferred I/O block size) is bigger and multiple to chosen
* logical block size -- report it as physical block size.
*/
if (params->blocksize_bytes != 0)
cbe_lun->blocksize = params->blocksize_bytes;
else if (cbe_lun->lun_type == T_CDROM)
cbe_lun->blocksize = 2048;
else
cbe_lun->blocksize = 512;
be_lun->size_blocks = be_lun->size_bytes / cbe_lun->blocksize;
cbe_lun->maxlba = (be_lun->size_blocks == 0) ?
0 : (be_lun->size_blocks - 1);
us = ps = vattr.va_blocksize;
uo = po = 0;
value = dnvlist_get_string(cbe_lun->options, "pblocksize", NULL);
if (value != NULL)
ctl_expand_number(value, &ps);
value = dnvlist_get_string(cbe_lun->options, "pblockoffset", NULL);
if (value != NULL)
ctl_expand_number(value, &po);
pss = ps / cbe_lun->blocksize;
pos = po / cbe_lun->blocksize;
if ((pss > 0) && (pss * cbe_lun->blocksize == ps) && (pss >= pos) &&
((pss & (pss - 1)) == 0) && (pos * cbe_lun->blocksize == po)) {
cbe_lun->pblockexp = fls(pss) - 1;
cbe_lun->pblockoff = (pss - pos) % pss;
}
value = dnvlist_get_string(cbe_lun->options, "ublocksize", NULL);
if (value != NULL)
ctl_expand_number(value, &us);
value = dnvlist_get_string(cbe_lun->options, "ublockoffset", NULL);
if (value != NULL)
ctl_expand_number(value, &uo);
uss = us / cbe_lun->blocksize;
uos = uo / cbe_lun->blocksize;
if ((uss > 0) && (uss * cbe_lun->blocksize == us) && (uss >= uos) &&
((uss & (uss - 1)) == 0) && (uos * cbe_lun->blocksize == uo)) {
cbe_lun->ublockexp = fls(uss) - 1;
cbe_lun->ublockoff = (uss - uos) % uss;
}
/*
* Sanity check. The media size has to be at least one
* sector long.
*/
if (be_lun->size_bytes < cbe_lun->blocksize) {
error = EINVAL;
snprintf(req->error_str, sizeof(req->error_str),
"file %s size %ju < block size %u", be_lun->dev_path,
(uintmax_t)be_lun->size_bytes, cbe_lun->blocksize);
}
cbe_lun->opttxferlen = CTLBLK_MAX_IO_SIZE / cbe_lun->blocksize;
return (error);
}
static int
ctl_be_block_open_dev(struct ctl_be_block_lun *be_lun, struct ctl_lun_req *req)
{
struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun;
struct ctl_lun_create_params *params;
struct cdevsw *csw;
struct cdev *dev;
const char *value;
int error, atomic, maxio, ref, unmap, tmp;
off_t ps, pss, po, pos, us, uss, uo, uos, otmp;
params = &be_lun->params;
be_lun->dev_type = CTL_BE_BLOCK_DEV;
csw = devvn_refthread(be_lun->vn, &dev, &ref);
if (csw == NULL)
return (ENXIO);
if (strcmp(csw->d_name, "zvol") == 0) {
be_lun->dispatch = ctl_be_block_dispatch_zvol;
be_lun->get_lba_status = ctl_be_block_gls_zvol;
atomic = maxio = CTLBLK_MAX_IO_SIZE;
} else {
be_lun->dispatch = ctl_be_block_dispatch_dev;
be_lun->get_lba_status = NULL;
atomic = 0;
maxio = dev->si_iosize_max;
if (maxio <= 0)
maxio = DFLTPHYS;
if (maxio > CTLBLK_MAX_SEG)
maxio = CTLBLK_MAX_SEG;
}
be_lun->lun_flush = ctl_be_block_flush_dev;
be_lun->getattr = ctl_be_block_getattr_dev;
be_lun->unmap = ctl_be_block_unmap_dev;
if (!csw->d_ioctl) {
dev_relthread(dev, ref);
snprintf(req->error_str, sizeof(req->error_str),
"no d_ioctl for device %s!", be_lun->dev_path);
return (ENODEV);
}
error = csw->d_ioctl(dev, DIOCGSECTORSIZE, (caddr_t)&tmp, FREAD,
curthread);
if (error) {
dev_relthread(dev, ref);
snprintf(req->error_str, sizeof(req->error_str),
"error %d returned for DIOCGSECTORSIZE ioctl "
"on %s!", error, be_lun->dev_path);
return (error);
}
/*
* If the user has asked for a blocksize that is greater than the
* backing device's blocksize, we can do it only if the blocksize
* the user is asking for is an even multiple of the underlying
* device's blocksize.
*/
if ((params->blocksize_bytes != 0) &&
(params->blocksize_bytes >= tmp)) {
if (params->blocksize_bytes % tmp == 0) {
cbe_lun->blocksize = params->blocksize_bytes;
} else {
dev_relthread(dev, ref);
snprintf(req->error_str, sizeof(req->error_str),
"requested blocksize %u is not an even "
"multiple of backing device blocksize %u",
params->blocksize_bytes, tmp);
return (EINVAL);
}
} else if (params->blocksize_bytes != 0) {
dev_relthread(dev, ref);
snprintf(req->error_str, sizeof(req->error_str),
"requested blocksize %u < backing device "
"blocksize %u", params->blocksize_bytes, tmp);
return (EINVAL);
} else if (cbe_lun->lun_type == T_CDROM)
cbe_lun->blocksize = MAX(tmp, 2048);
else
cbe_lun->blocksize = tmp;
error = csw->d_ioctl(dev, DIOCGMEDIASIZE, (caddr_t)&otmp, FREAD,
curthread);
if (error) {
dev_relthread(dev, ref);
snprintf(req->error_str, sizeof(req->error_str),
"error %d returned for DIOCGMEDIASIZE "
" ioctl on %s!", error,
be_lun->dev_path);
return (error);
}
if (params->lun_size_bytes != 0) {
if (params->lun_size_bytes > otmp) {
dev_relthread(dev, ref);
snprintf(req->error_str, sizeof(req->error_str),
"requested LUN size %ju > backing device "
"size %ju",
(uintmax_t)params->lun_size_bytes,
(uintmax_t)otmp);
return (EINVAL);
}
be_lun->size_bytes = params->lun_size_bytes;
} else
be_lun->size_bytes = otmp;
be_lun->size_blocks = be_lun->size_bytes / cbe_lun->blocksize;
cbe_lun->maxlba = (be_lun->size_blocks == 0) ?
0 : (be_lun->size_blocks - 1);
error = csw->d_ioctl(dev, DIOCGSTRIPESIZE, (caddr_t)&ps, FREAD,
curthread);
if (error)
ps = po = 0;
else {
error = csw->d_ioctl(dev, DIOCGSTRIPEOFFSET, (caddr_t)&po,
FREAD, curthread);
if (error)
po = 0;
}
us = ps;
uo = po;
value = dnvlist_get_string(cbe_lun->options, "pblocksize", NULL);
if (value != NULL)
ctl_expand_number(value, &ps);
value = dnvlist_get_string(cbe_lun->options, "pblockoffset", NULL);
if (value != NULL)
ctl_expand_number(value, &po);
pss = ps / cbe_lun->blocksize;
pos = po / cbe_lun->blocksize;
if ((pss > 0) && (pss * cbe_lun->blocksize == ps) && (pss >= pos) &&
((pss & (pss - 1)) == 0) && (pos * cbe_lun->blocksize == po)) {
cbe_lun->pblockexp = fls(pss) - 1;
cbe_lun->pblockoff = (pss - pos) % pss;
}
value = dnvlist_get_string(cbe_lun->options, "ublocksize", NULL);
if (value != NULL)
ctl_expand_number(value, &us);
value = dnvlist_get_string(cbe_lun->options, "ublockoffset", NULL);
if (value != NULL)
ctl_expand_number(value, &uo);
uss = us / cbe_lun->blocksize;
uos = uo / cbe_lun->blocksize;
if ((uss > 0) && (uss * cbe_lun->blocksize == us) && (uss >= uos) &&
((uss & (uss - 1)) == 0) && (uos * cbe_lun->blocksize == uo)) {
cbe_lun->ublockexp = fls(uss) - 1;
cbe_lun->ublockoff = (uss - uos) % uss;
}
cbe_lun->atomicblock = atomic / cbe_lun->blocksize;
cbe_lun->opttxferlen = maxio / cbe_lun->blocksize;
if (be_lun->dispatch == ctl_be_block_dispatch_zvol) {
unmap = 1;
} else {
struct diocgattr_arg arg;
strlcpy(arg.name, "GEOM::candelete", sizeof(arg.name));
arg.len = sizeof(arg.value.i);
error = csw->d_ioctl(dev, DIOCGATTR, (caddr_t)&arg, FREAD,
curthread);
unmap = (error == 0) ? arg.value.i : 0;
}
value = dnvlist_get_string(cbe_lun->options, "unmap", NULL);
if (value != NULL)
unmap = (strcmp(value, "on") == 0);
if (unmap)
cbe_lun->flags |= CTL_LUN_FLAG_UNMAP;
else
cbe_lun->flags &= ~CTL_LUN_FLAG_UNMAP;
dev_relthread(dev, ref);
return (0);
}
static int
ctl_be_block_close(struct ctl_be_block_lun *be_lun)
{
struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun;
int flags;
if (be_lun->vn) {
flags = FREAD;
if ((cbe_lun->flags & CTL_LUN_FLAG_READONLY) == 0)
flags |= FWRITE;
(void)vn_close(be_lun->vn, flags, NOCRED, curthread);
be_lun->vn = NULL;
switch (be_lun->dev_type) {
case CTL_BE_BLOCK_DEV:
break;
case CTL_BE_BLOCK_FILE:
if (be_lun->backend.file.cred != NULL) {
crfree(be_lun->backend.file.cred);
be_lun->backend.file.cred = NULL;
}
break;
case CTL_BE_BLOCK_NONE:
break;
default:
panic("Unexpected backend type %d", be_lun->dev_type);
break;
}
be_lun->dev_type = CTL_BE_BLOCK_NONE;
}
return (0);
}
static int
ctl_be_block_open(struct ctl_be_block_lun *be_lun, struct ctl_lun_req *req)
{
struct ctl_be_lun *cbe_lun = &be_lun->cbe_lun;
struct nameidata nd;
const char *value;
int error, flags;
error = 0;
if (rootvnode == NULL) {
snprintf(req->error_str, sizeof(req->error_str),
"Root filesystem is not mounted");
return (1);
}
pwd_ensure_dirs();
value = dnvlist_get_string(cbe_lun->options, "file", NULL);
if (value == NULL) {
snprintf(req->error_str, sizeof(req->error_str),
"no file argument specified");
return (1);
}
free(be_lun->dev_path, M_CTLBLK);
be_lun->dev_path = strdup(value, M_CTLBLK);
flags = FREAD;
value = dnvlist_get_string(cbe_lun->options, "readonly", NULL);
if (value != NULL) {
if (strcmp(value, "on") != 0)
flags |= FWRITE;
} else if (cbe_lun->lun_type == T_DIRECT)
flags |= FWRITE;
again:
NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, be_lun->dev_path, curthread);
error = vn_open(&nd, &flags, 0, NULL);
if ((error == EROFS || error == EACCES) && (flags & FWRITE)) {
flags &= ~FWRITE;
goto again;
}
if (error) {
/*
* This is the only reasonable guess we can make as far as
* path if the user doesn't give us a fully qualified path.
* If they want to specify a file, they need to specify the
* full path.
*/
if (be_lun->dev_path[0] != '/') {
char *dev_name;
asprintf(&dev_name, M_CTLBLK, "/dev/%s",
be_lun->dev_path);
free(be_lun->dev_path, M_CTLBLK);
be_lun->dev_path = dev_name;
goto again;
}
snprintf(req->error_str, sizeof(req->error_str),
"error opening %s: %d", be_lun->dev_path, error);
return (error);
}
if (flags & FWRITE)
cbe_lun->flags &= ~CTL_LUN_FLAG_READONLY;
else
cbe_lun->flags |= CTL_LUN_FLAG_READONLY;
NDFREE(&nd, NDF_ONLY_PNBUF);
be_lun->vn = nd.ni_vp;
/* We only support disks and files. */
if (vn_isdisk_error(be_lun->vn, &error)) {
error = ctl_be_block_open_dev(be_lun, req);
} else if (be_lun->vn->v_type == VREG) {
error = ctl_be_block_open_file(be_lun, req);
} else {
error = EINVAL;
snprintf(req->error_str, sizeof(req->error_str),
"%s is not a disk or plain file", be_lun->dev_path);
}
VOP_UNLOCK(be_lun->vn);
if (error != 0)
ctl_be_block_close(be_lun);
cbe_lun->serseq = CTL_LUN_SERSEQ_OFF;
if (be_lun->dispatch != ctl_be_block_dispatch_dev)
cbe_lun->serseq = CTL_LUN_SERSEQ_SOFT;
value = dnvlist_get_string(cbe_lun->options, "serseq", NULL);
if (value != NULL && strcmp(value, "on") == 0)
cbe_lun->serseq = CTL_LUN_SERSEQ_ON;
else if (value != NULL && strcmp(value, "read") == 0)
cbe_lun->serseq = CTL_LUN_SERSEQ_READ;
else if (value != NULL && strcmp(value, "soft") == 0)
cbe_lun->serseq = CTL_LUN_SERSEQ_SOFT;
else if (value != NULL && strcmp(value, "off") == 0)
cbe_lun->serseq = CTL_LUN_SERSEQ_OFF;
return (0);
}
static int
ctl_be_block_create(struct ctl_be_block_softc *softc, struct ctl_lun_req *req)
{
struct ctl_be_lun *cbe_lun;
struct ctl_be_block_lun *be_lun;
struct ctl_lun_create_params *params;
char num_thread_str[16];
char tmpstr[32];
const char *value;
int retval, num_threads;
int tmp_num_threads;
params = &req->reqdata.create;
retval = 0;
req->status = CTL_LUN_OK;
be_lun = malloc(sizeof(*be_lun), M_CTLBLK, M_ZERO | M_WAITOK);
cbe_lun = &be_lun->cbe_lun;
be_lun->params = req->reqdata.create;
be_lun->softc = softc;
STAILQ_INIT(&be_lun->input_queue);
STAILQ_INIT(&be_lun->config_read_queue);
STAILQ_INIT(&be_lun->config_write_queue);
STAILQ_INIT(&be_lun->datamove_queue);
mtx_init(&be_lun->io_lock, "ctlblock io", NULL, MTX_DEF);
mtx_init(&be_lun->queue_lock, "ctlblock queue", NULL, MTX_DEF);
cbe_lun->options = nvlist_clone(req->args_nvl);
if (params->flags & CTL_LUN_FLAG_DEV_TYPE)
cbe_lun->lun_type = params->device_type;
else
cbe_lun->lun_type = T_DIRECT;
be_lun->flags = 0;
cbe_lun->flags = 0;
value = dnvlist_get_string(cbe_lun->options, "ha_role", NULL);
if (value != NULL) {
if (strcmp(value, "primary") == 0)
cbe_lun->flags |= CTL_LUN_FLAG_PRIMARY;
} else if (control_softc->flags & CTL_FLAG_ACTIVE_SHELF)
cbe_lun->flags |= CTL_LUN_FLAG_PRIMARY;
if (cbe_lun->lun_type == T_DIRECT ||
cbe_lun->lun_type == T_CDROM) {
be_lun->size_bytes = params->lun_size_bytes;
if (params->blocksize_bytes != 0)
cbe_lun->blocksize = params->blocksize_bytes;
else if (cbe_lun->lun_type == T_CDROM)
cbe_lun->blocksize = 2048;
else
cbe_lun->blocksize = 512;
be_lun->size_blocks = be_lun->size_bytes / cbe_lun->blocksize;
cbe_lun->maxlba = (be_lun->size_blocks == 0) ?
0 : (be_lun->size_blocks - 1);
if ((cbe_lun->flags & CTL_LUN_FLAG_PRIMARY) ||
control_softc->ha_mode == CTL_HA_MODE_SER_ONLY) {
retval = ctl_be_block_open(be_lun, req);
if (retval != 0) {
retval = 0;
req->status = CTL_LUN_WARNING;
}
}
num_threads = cbb_num_threads;
} else {
num_threads = 1;
}
value = dnvlist_get_string(cbe_lun->options, "num_threads", NULL);
if (value != NULL) {
tmp_num_threads = strtol(value, NULL, 0);
/*
* We don't let the user specify less than one
* thread, but hope he's clueful enough not to
* specify 1000 threads.
*/
if (tmp_num_threads < 1) {
snprintf(req->error_str, sizeof(req->error_str),
"invalid number of threads %s",
num_thread_str);
goto bailout_error;
}
num_threads = tmp_num_threads;
}
if (be_lun->vn == NULL)
cbe_lun->flags |= CTL_LUN_FLAG_NO_MEDIA;
/* Tell the user the blocksize we ended up using */
params->lun_size_bytes = be_lun->size_bytes;
params->blocksize_bytes = cbe_lun->blocksize;
if (params->flags & CTL_LUN_FLAG_ID_REQ) {
cbe_lun->req_lun_id = params->req_lun_id;
cbe_lun->flags |= CTL_LUN_FLAG_ID_REQ;
} else
cbe_lun->req_lun_id = 0;
cbe_lun->lun_shutdown = ctl_be_block_lun_shutdown;
cbe_lun->be = &ctl_be_block_driver;
if ((params->flags & CTL_LUN_FLAG_SERIAL_NUM) == 0) {
snprintf(tmpstr, sizeof(tmpstr), "MYSERIAL%04d",
softc->num_luns);
strncpy((char *)cbe_lun->serial_num, tmpstr,
MIN(sizeof(cbe_lun->serial_num), sizeof(tmpstr)));
/* Tell the user what we used for a serial number */
strncpy((char *)params->serial_num, tmpstr,
MIN(sizeof(params->serial_num), sizeof(tmpstr)));
} else {
strncpy((char *)cbe_lun->serial_num, params->serial_num,
MIN(sizeof(cbe_lun->serial_num),
sizeof(params->serial_num)));
}
if ((params->flags & CTL_LUN_FLAG_DEVID) == 0) {
snprintf(tmpstr, sizeof(tmpstr), "MYDEVID%04d", softc->num_luns);
strncpy((char *)cbe_lun->device_id, tmpstr,
MIN(sizeof(cbe_lun->device_id), sizeof(tmpstr)));
/* Tell the user what we used for a device ID */
strncpy((char *)params->device_id, tmpstr,
MIN(sizeof(params->device_id), sizeof(tmpstr)));
} else {
strncpy((char *)cbe_lun->device_id, params->device_id,
MIN(sizeof(cbe_lun->device_id),
sizeof(params->device_id)));
}
TASK_INIT(&be_lun->io_task, /*priority*/0, ctl_be_block_worker, be_lun);
be_lun->io_taskqueue = taskqueue_create("ctlblocktq", M_WAITOK,
taskqueue_thread_enqueue, /*context*/&be_lun->io_taskqueue);
if (be_lun->io_taskqueue == NULL) {
snprintf(req->error_str, sizeof(req->error_str),
"unable to create taskqueue");
goto bailout_error;
}
/*
* Note that we start the same number of threads by default for
* both the file case and the block device case. For the file
* case, we need multiple threads to allow concurrency, because the
* vnode interface is designed to be a blocking interface. For the
* block device case, ZFS zvols at least will block the caller's
* context in many instances, and so we need multiple threads to
* overcome that problem. Other block devices don't need as many
* threads, but they shouldn't cause too many problems.
*
* If the user wants to just have a single thread for a block
* device, he can specify that when the LUN is created, or change
* the tunable/sysctl to alter the default number of threads.
*/
retval = taskqueue_start_threads_in_proc(&be_lun->io_taskqueue,
/*num threads*/num_threads,
/*priority*/PUSER,
/*proc*/control_softc->ctl_proc,
/*thread name*/"block");
if (retval != 0)
goto bailout_error;
be_lun->num_threads = num_threads;
retval = ctl_add_lun(&be_lun->cbe_lun);
if (retval != 0) {
snprintf(req->error_str, sizeof(req->error_str),
"ctl_add_lun() returned error %d, see dmesg for "
"details", retval);
retval = 0;
goto bailout_error;
}
be_lun->disk_stats = devstat_new_entry("cbb", cbe_lun->lun_id,
cbe_lun->blocksize,
DEVSTAT_ALL_SUPPORTED,
cbe_lun->lun_type
| DEVSTAT_TYPE_IF_OTHER,
DEVSTAT_PRIORITY_OTHER);
mtx_lock(&softc->lock);
softc->num_luns++;
SLIST_INSERT_HEAD(&softc->lun_list, be_lun, links);
mtx_unlock(&softc->lock);
params->req_lun_id = cbe_lun->lun_id;
return (retval);
bailout_error:
req->status = CTL_LUN_ERROR;
if (be_lun->io_taskqueue != NULL)
taskqueue_free(be_lun->io_taskqueue);
ctl_be_block_close(be_lun);
if (be_lun->dev_path != NULL)
free(be_lun->dev_path, M_CTLBLK);
nvlist_destroy(cbe_lun->options);
mtx_destroy(&be_lun->queue_lock);
mtx_destroy(&be_lun->io_lock);
free(be_lun, M_CTLBLK);
return (retval);
}
static int
ctl_be_block_rm(struct ctl_be_block_softc *softc, struct ctl_lun_req *req)
{
struct ctl_lun_rm_params *params;
struct ctl_be_block_lun *be_lun;
struct ctl_be_lun *cbe_lun;
int retval;
params = &req->reqdata.rm;
sx_xlock(&softc->modify_lock);
mtx_lock(&softc->lock);
SLIST_FOREACH(be_lun, &softc->lun_list, links) {
if (be_lun->cbe_lun.lun_id == params->lun_id) {
SLIST_REMOVE(&softc->lun_list, be_lun,
ctl_be_block_lun, links);
softc->num_luns--;
break;
}
}
mtx_unlock(&softc->lock);
sx_xunlock(&softc->modify_lock);
if (be_lun == NULL) {
snprintf(req->error_str, sizeof(req->error_str),
"LUN %u is not managed by the block backend",
params->lun_id);
goto bailout_error;
}
cbe_lun = &be_lun->cbe_lun;
if (be_lun->vn != NULL) {
cbe_lun->flags |= CTL_LUN_FLAG_NO_MEDIA;
ctl_lun_no_media(cbe_lun);
taskqueue_drain_all(be_lun->io_taskqueue);
ctl_be_block_close(be_lun);
}
mtx_lock(&softc->lock);
be_lun->flags |= CTL_BE_BLOCK_LUN_WAITING;
mtx_unlock(&softc->lock);
retval = ctl_remove_lun(cbe_lun);
if (retval != 0) {
snprintf(req->error_str, sizeof(req->error_str),
"error %d returned from ctl_remove_lun() for "
"LUN %d", retval, params->lun_id);
mtx_lock(&softc->lock);
be_lun->flags &= ~CTL_BE_BLOCK_LUN_WAITING;
mtx_unlock(&softc->lock);
goto bailout_error;
}
mtx_lock(&softc->lock);
while ((be_lun->flags & CTL_BE_BLOCK_LUN_UNCONFIGURED) == 0) {
retval = msleep(be_lun, &softc->lock, PCATCH, "ctlblockrm", 0);
if (retval == EINTR)
break;
}
be_lun->flags &= ~CTL_BE_BLOCK_LUN_WAITING;
if (be_lun->flags & CTL_BE_BLOCK_LUN_UNCONFIGURED) {
mtx_unlock(&softc->lock);
free(be_lun, M_CTLBLK);
} else {
mtx_unlock(&softc->lock);
return (EINTR);
}
req->status = CTL_LUN_OK;
return (0);
bailout_error:
req->status = CTL_LUN_ERROR;
return (0);
}
static int
ctl_be_block_modify(struct ctl_be_block_softc *softc, struct ctl_lun_req *req)
{
struct ctl_lun_modify_params *params;
struct ctl_be_block_lun *be_lun;
struct ctl_be_lun *cbe_lun;
const char *value;
uint64_t oldsize;
int error, wasprim;
params = &req->reqdata.modify;
sx_xlock(&softc->modify_lock);
mtx_lock(&softc->lock);
SLIST_FOREACH(be_lun, &softc->lun_list, links) {
if (be_lun->cbe_lun.lun_id == params->lun_id)
break;
}
mtx_unlock(&softc->lock);
if (be_lun == NULL) {
snprintf(req->error_str, sizeof(req->error_str),
"LUN %u is not managed by the block backend",
params->lun_id);
goto bailout_error;
}
cbe_lun = &be_lun->cbe_lun;
if (params->lun_size_bytes != 0)
be_lun->params.lun_size_bytes = params->lun_size_bytes;
if (req->args_nvl != NULL) {
nvlist_destroy(cbe_lun->options);
cbe_lun->options = nvlist_clone(req->args_nvl);
}
wasprim = (cbe_lun->flags & CTL_LUN_FLAG_PRIMARY);
value = dnvlist_get_string(cbe_lun->options, "ha_role", NULL);
if (value != NULL) {
if (strcmp(value, "primary") == 0)
cbe_lun->flags |= CTL_LUN_FLAG_PRIMARY;
else
cbe_lun->flags &= ~CTL_LUN_FLAG_PRIMARY;
} else if (control_softc->flags & CTL_FLAG_ACTIVE_SHELF)
cbe_lun->flags |= CTL_LUN_FLAG_PRIMARY;
else
cbe_lun->flags &= ~CTL_LUN_FLAG_PRIMARY;
if (wasprim != (cbe_lun->flags & CTL_LUN_FLAG_PRIMARY)) {
if (cbe_lun->flags & CTL_LUN_FLAG_PRIMARY)
ctl_lun_primary(cbe_lun);
else
ctl_lun_secondary(cbe_lun);
}
oldsize = be_lun->size_blocks;
if ((cbe_lun->flags & CTL_LUN_FLAG_PRIMARY) ||
control_softc->ha_mode == CTL_HA_MODE_SER_ONLY) {
if (be_lun->vn == NULL)
error = ctl_be_block_open(be_lun, req);
else if (vn_isdisk_error(be_lun->vn, &error))
error = ctl_be_block_open_dev(be_lun, req);
else if (be_lun->vn->v_type == VREG) {
vn_lock(be_lun->vn, LK_SHARED | LK_RETRY);
error = ctl_be_block_open_file(be_lun, req);
VOP_UNLOCK(be_lun->vn);
} else
error = EINVAL;
if ((cbe_lun->flags & CTL_LUN_FLAG_NO_MEDIA) &&
be_lun->vn != NULL) {
cbe_lun->flags &= ~CTL_LUN_FLAG_NO_MEDIA;
ctl_lun_has_media(cbe_lun);
} else if ((cbe_lun->flags & CTL_LUN_FLAG_NO_MEDIA) == 0 &&
be_lun->vn == NULL) {
cbe_lun->flags |= CTL_LUN_FLAG_NO_MEDIA;
ctl_lun_no_media(cbe_lun);
}
cbe_lun->flags &= ~CTL_LUN_FLAG_EJECTED;
} else {
if (be_lun->vn != NULL) {
cbe_lun->flags |= CTL_LUN_FLAG_NO_MEDIA;
ctl_lun_no_media(cbe_lun);
taskqueue_drain_all(be_lun->io_taskqueue);
error = ctl_be_block_close(be_lun);
} else
error = 0;
}
if (be_lun->size_blocks != oldsize)
ctl_lun_capacity_changed(cbe_lun);
/* Tell the user the exact size we ended up using */
params->lun_size_bytes = be_lun->size_bytes;
sx_xunlock(&softc->modify_lock);
req->status = error ? CTL_LUN_WARNING : CTL_LUN_OK;
return (0);
bailout_error:
sx_xunlock(&softc->modify_lock);
req->status = CTL_LUN_ERROR;
return (0);
}
static void
ctl_be_block_lun_shutdown(struct ctl_be_lun *cbe_lun)
{
struct ctl_be_block_lun *be_lun = (struct ctl_be_block_lun *)cbe_lun;
struct ctl_be_block_softc *softc = be_lun->softc;
taskqueue_drain_all(be_lun->io_taskqueue);
taskqueue_free(be_lun->io_taskqueue);
if (be_lun->disk_stats != NULL)
devstat_remove_entry(be_lun->disk_stats);
nvlist_destroy(be_lun->cbe_lun.options);
free(be_lun->dev_path, M_CTLBLK);
mtx_destroy(&be_lun->queue_lock);
mtx_destroy(&be_lun->io_lock);
mtx_lock(&softc->lock);
be_lun->flags |= CTL_BE_BLOCK_LUN_UNCONFIGURED;
if (be_lun->flags & CTL_BE_BLOCK_LUN_WAITING)
wakeup(be_lun);
else
free(be_lun, M_CTLBLK);
mtx_unlock(&softc->lock);
}
static int
ctl_be_block_config_write(union ctl_io *io)
{
struct ctl_be_block_lun *be_lun;
struct ctl_be_lun *cbe_lun;
int retval;
DPRINTF("entered\n");
cbe_lun = CTL_BACKEND_LUN(io);
be_lun = (struct ctl_be_block_lun *)cbe_lun;
retval = 0;
switch (io->scsiio.cdb[0]) {
case SYNCHRONIZE_CACHE:
case SYNCHRONIZE_CACHE_16:
case WRITE_SAME_10:
case WRITE_SAME_16:
case UNMAP:
/*
* The upper level CTL code will filter out any CDBs with
* the immediate bit set and return the proper error.
*
* We don't really need to worry about what LBA range the
* user asked to be synced out. When they issue a sync
* cache command, we'll sync out the whole thing.
*/
mtx_lock(&be_lun->queue_lock);
STAILQ_INSERT_TAIL(&be_lun->config_write_queue, &io->io_hdr,
links);
mtx_unlock(&be_lun->queue_lock);
taskqueue_enqueue(be_lun->io_taskqueue, &be_lun->io_task);
break;
case START_STOP_UNIT: {
struct scsi_start_stop_unit *cdb;
struct ctl_lun_req req;
cdb = (struct scsi_start_stop_unit *)io->scsiio.cdb;
if ((cdb->how & SSS_PC_MASK) != 0) {
ctl_set_success(&io->scsiio);
ctl_config_write_done(io);
break;
}
if (cdb->how & SSS_START) {
if ((cdb->how & SSS_LOEJ) && be_lun->vn == NULL) {
retval = ctl_be_block_open(be_lun, &req);
cbe_lun->flags &= ~CTL_LUN_FLAG_EJECTED;
if (retval == 0) {
cbe_lun->flags &= ~CTL_LUN_FLAG_NO_MEDIA;
ctl_lun_has_media(cbe_lun);
} else {
cbe_lun->flags |= CTL_LUN_FLAG_NO_MEDIA;
ctl_lun_no_media(cbe_lun);
}
}
ctl_start_lun(cbe_lun);
} else {
ctl_stop_lun(cbe_lun);
if (cdb->how & SSS_LOEJ) {
cbe_lun->flags |= CTL_LUN_FLAG_NO_MEDIA;
cbe_lun->flags |= CTL_LUN_FLAG_EJECTED;
ctl_lun_ejected(cbe_lun);
if (be_lun->vn != NULL)
ctl_be_block_close(be_lun);
}
}
ctl_set_success(&io->scsiio);
ctl_config_write_done(io);
break;
}
case PREVENT_ALLOW:
ctl_set_success(&io->scsiio);
ctl_config_write_done(io);
break;
default:
ctl_set_invalid_opcode(&io->scsiio);
ctl_config_write_done(io);
retval = CTL_RETVAL_COMPLETE;
break;
}
return (retval);
}
static int
ctl_be_block_config_read(union ctl_io *io)
{
struct ctl_be_block_lun *be_lun;
int retval = 0;
DPRINTF("entered\n");
be_lun = (struct ctl_be_block_lun *)CTL_BACKEND_LUN(io);
switch (io->scsiio.cdb[0]) {
case SERVICE_ACTION_IN:
if (io->scsiio.cdb[1] == SGLS_SERVICE_ACTION) {
mtx_lock(&be_lun->queue_lock);
STAILQ_INSERT_TAIL(&be_lun->config_read_queue,
&io->io_hdr, links);
mtx_unlock(&be_lun->queue_lock);
taskqueue_enqueue(be_lun->io_taskqueue,
&be_lun->io_task);
retval = CTL_RETVAL_QUEUED;
break;
}
ctl_set_invalid_field(&io->scsiio,
/*sks_valid*/ 1,
/*command*/ 1,
/*field*/ 1,
/*bit_valid*/ 1,
/*bit*/ 4);
ctl_config_read_done(io);
retval = CTL_RETVAL_COMPLETE;
break;
default:
ctl_set_invalid_opcode(&io->scsiio);
ctl_config_read_done(io);
retval = CTL_RETVAL_COMPLETE;
break;
}
return (retval);
}
static int
ctl_be_block_lun_info(struct ctl_be_lun *cbe_lun, struct sbuf *sb)
{
struct ctl_be_block_lun *lun = (struct ctl_be_block_lun *)cbe_lun;
int retval;
retval = sbuf_printf(sb, "\t<num_threads>");
if (retval != 0)
goto bailout;
retval = sbuf_printf(sb, "%d", lun->num_threads);
if (retval != 0)
goto bailout;
retval = sbuf_printf(sb, "</num_threads>\n");
bailout:
return (retval);
}
static uint64_t
ctl_be_block_lun_attr(struct ctl_be_lun *cbe_lun, const char *attrname)
{
struct ctl_be_block_lun *lun = (struct ctl_be_block_lun *)cbe_lun;
if (lun->getattr == NULL)
return (UINT64_MAX);
return (lun->getattr(lun, attrname));
}
static int
ctl_be_block_init(void)
{
struct ctl_be_block_softc *softc = &backend_block_softc;
sx_init(&softc->modify_lock, "ctlblock modify");
mtx_init(&softc->lock, "ctlblock", NULL, MTX_DEF);
softc->beio_zone = uma_zcreate("beio", sizeof(struct ctl_be_block_io),
NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
softc->bufmin_zone = uma_zcreate("ctlblockmin", CTLBLK_MIN_SEG,
NULL, NULL, NULL, NULL, /*align*/ 0, /*flags*/0);
if (CTLBLK_MIN_SEG < CTLBLK_MAX_SEG)
softc->bufmax_zone = uma_zcreate("ctlblockmax", CTLBLK_MAX_SEG,
NULL, NULL, NULL, NULL, /*align*/ 0, /*flags*/0);
SLIST_INIT(&softc->lun_list);
return (0);
}
static int
ctl_be_block_shutdown(void)
{
struct ctl_be_block_softc *softc = &backend_block_softc;
struct ctl_be_block_lun *lun;
mtx_lock(&softc->lock);
while ((lun = SLIST_FIRST(&softc->lun_list)) != NULL) {
SLIST_REMOVE_HEAD(&softc->lun_list, links);
softc->num_luns--;
/*
* Drop our lock here. Since ctl_remove_lun() can call
* back into us, this could potentially lead to a recursive
* lock of the same mutex, which would cause a hang.
*/
mtx_unlock(&softc->lock);
ctl_remove_lun(&lun->cbe_lun);
mtx_lock(&softc->lock);
}
mtx_unlock(&softc->lock);
uma_zdestroy(softc->bufmin_zone);
if (CTLBLK_MIN_SEG < CTLBLK_MAX_SEG)
uma_zdestroy(softc->bufmax_zone);
uma_zdestroy(softc->beio_zone);
mtx_destroy(&softc->lock);
sx_destroy(&softc->modify_lock);
return (0);
}
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