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freebsd-skq/sys/cam/ctl/ctl_backend_block.c
Alexander Motin ac503c194c Introduce "soft" serseq variant. 
With new ZFS prefetcher improvements it is no longer needed to fully
serialize reads to reach decent prediction hit rate.  Softer variant
only creates small time window to reduce races instead of completely
blocking following reads while previous is running.  It much less
hurts the performance in case of prediction miss.

MFC after:	1 month
2021-04-06 17:27:16 -04:00

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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, lock_flags;
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);
if (MNT_SHARED_WRITES(mountpoint) ||
((mountpoint == NULL) && MNT_SHARED_WRITES(be_lun->vn->v_mount)))
lock_flags = LK_SHARED;
else
lock_flags = LK_EXCLUSIVE;
vn_lock(be_lun->vn, lock_flags | 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;
int lock_flags;
(void)vn_start_write(be_lun->vn, &mountpoint, V_WAIT);
if (MNT_SHARED_WRITES(mountpoint) || ((mountpoint == NULL)
&& MNT_SHARED_WRITES(be_lun->vn->v_mount)))
lock_flags = LK_SHARED;
else
lock_flags = LK_EXCLUSIVE;
vn_lock(be_lun->vn, lock_flags | 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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