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freebsd-skq/sys/cam/ctl/ctl_backend_block.c

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/*-
* Copyright (c) 2003 Silicon Graphics International Corp.
* Copyright (c) 2009-2011 Spectra Logic Corporation
* Copyright (c) 2012 The FreeBSD Foundation
* 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/proc.h>
#include <sys/pcpu.h>
#include <sys/module.h>
#include <sys/sdt.h>
#include <sys/devicestat.h>
#include <sys/sysctl.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_frontend_internal.h>
#include <cam/ctl/ctl_ioctl.h>
#include <cam/ctl/ctl_scsi_all.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_MAX_SEG MAXPHYS
#define CTLBLK_HALF_SEGS MAX(CTLBLK_HALF_IO_SIZE / CTLBLK_MAX_SEG, 1)
#define CTLBLK_MAX_SEGS (CTLBLK_HALF_SEGS * 2)
#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_CONFIG_ERR = 0x02,
CTL_BE_BLOCK_LUN_WAITING = 0x04,
CTL_BE_BLOCK_LUN_MULTI_THREAD = 0x08
} 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_devdata {
struct cdev *cdev;
struct cdevsw *csw;
int dev_ref;
};
struct ctl_be_block_filedata {
struct ucred *cred;
};
union ctl_be_block_bedata {
struct ctl_be_block_devdata dev;
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);
/*
* 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_block_disk *disk;
char lunname[32];
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;
uma_zone_t lun_zone;
uint64_t size_blocks;
uint64_t size_bytes;
uint32_t blocksize;
int blocksize_shift;
uint16_t pblockexp;
uint16_t pblockoff;
struct ctl_be_block_softc *softc;
struct devstat *disk_stats;
ctl_be_block_lun_flags flags;
STAILQ_ENTRY(ctl_be_block_lun) links;
struct ctl_be_lun ctl_be_lun;
struct taskqueue *io_taskqueue;
struct task io_task;
int num_threads;
STAILQ_HEAD(, ctl_io_hdr) input_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 mtx lock;
int num_disks;
STAILQ_HEAD(, ctl_block_disk) disk_list;
int num_luns;
STAILQ_HEAD(, ctl_be_block_lun) lun_list;
};
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 bio_cmd;
int bio_flags;
int num_segs;
int num_bios_sent;
int num_bios_done;
int send_complete;
int num_errors;
struct bintime ds_t0;
devstat_tag_type ds_tag_type;
devstat_trans_flags ds_trans_type;
uint64_t io_len;
uint64_t io_offset;
struct ctl_be_block_softc *softc;
struct ctl_be_block_lun *lun;
void (*beio_cont)(struct ctl_be_block_io *beio); /* to continue processing */
};
static int cbb_num_threads = 14;
SYSCTL_NODE(_kern_cam_ctl, OID_AUTO, block, CTLFLAG_RD, 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);
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_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 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_softc *softc,
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_file(struct ctl_be_block_lun *be_lun,
struct ctl_lun_req *req);
static int ctl_be_block_modify_dev(struct ctl_be_block_lun *be_lun,
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(void *be_lun);
static void ctl_be_block_lun_config_status(void *be_lun,
ctl_lun_config_status status);
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(void *be_lun, struct sbuf *sb);
int ctl_be_block_init(void);
static struct ctl_backend_driver ctl_be_block_driver =
{
.name = "block",
.flags = CTL_BE_FLAG_HAS_CONFIG,
.init = ctl_be_block_init,
.data_submit = ctl_be_block_submit,
.data_move_done = ctl_be_block_move_done,
.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
};
MALLOC_DEFINE(M_CTLBLK, "ctlblk", "Memory used for CTL block backend");
CTL_BACKEND_DECLARE(cbb, ctl_be_block_driver);
static uma_zone_t beio_zone;
static struct ctl_be_block_io *
ctl_alloc_beio(struct ctl_be_block_softc *softc)
{
struct ctl_be_block_io *beio;
beio = uma_zalloc(beio_zone, M_WAITOK | M_ZERO);
beio->softc = softc;
return (beio);
}
static void
ctl_free_beio(struct ctl_be_block_io *beio)
{
int duplicate_free;
int i;
duplicate_free = 0;
for (i = 0; i < beio->num_segs; i++) {
if (beio->sg_segs[i].addr == NULL)
duplicate_free++;
uma_zfree(beio->lun->lun_zone, beio->sg_segs[i].addr);
beio->sg_segs[i].addr = NULL;
/* For compare we had two equal S/G lists. */
if (ARGS(beio->io)->flags & CTL_LLF_COMPARE) {
uma_zfree(beio->lun->lun_zone,
beio->sg_segs[i + CTLBLK_HALF_SEGS].addr);
beio->sg_segs[i + CTLBLK_HALF_SEGS].addr = NULL;
}
}
if (duplicate_free > 0) {
printf("%s: %d duplicate frees out of %d segments\n", __func__,
duplicate_free, beio->num_segs);
}
uma_zfree(beio_zone, beio);
}
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 int
ctl_be_block_move_done(union ctl_io *io)
{
struct ctl_be_block_io *beio;
struct ctl_be_block_lun *be_lun;
struct ctl_lba_len_flags *lbalen;
#ifdef CTL_TIME_IO
struct bintime cur_bt;
#endif
int i;
beio = (struct ctl_be_block_io *)PRIV(io)->ptr;
be_lun = beio->lun;
DPRINTF("entered\n");
#ifdef CTL_TIME_IO
getbintime(&cur_bt);
bintime_sub(&cur_bt, &io->io_hdr.dma_start_bt);
bintime_add(&io->io_hdr.dma_bt, &cur_bt);
io->io_hdr.num_dmas++;
#endif
io->scsiio.kern_rel_offset += io->scsiio.kern_data_len;
/*
* We set status at this point for read commands, and write
* commands with errors.
*/
if ((io->io_hdr.port_status == 0) &&
((io->io_hdr.flags & CTL_FLAG_ABORT) == 0) &&
((io->io_hdr.status & CTL_STATUS_MASK) == CTL_STATUS_NONE)) {
lbalen = ARGS(beio->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. */
for (i = 0; i < beio->num_segs; i++) {
if (memcmp(beio->sg_segs[i].addr,
beio->sg_segs[i + CTLBLK_HALF_SEGS].addr,
beio->sg_segs[i].len) != 0)
break;
}
if (i < beio->num_segs)
ctl_set_sense(&io->scsiio,
/*current_error*/ 1,
/*sense_key*/ SSD_KEY_MISCOMPARE,
/*asc*/ 0x1D,
/*ascq*/ 0x00,
SSD_ELEM_NONE);
else
ctl_set_success(&io->scsiio);
}
}
else if ((io->io_hdr.port_status != 0)
&& ((io->io_hdr.flags & CTL_FLAG_ABORT) == 0)
&& ((io->io_hdr.status & CTL_STATUS_MASK) == CTL_STATUS_NONE)) {
/*
* For hardware error sense keys, the sense key
* specific value is defined to be a retry count,
* but we use it to pass back an internal FETD
* error code. XXX KDM Hopefully the FETD is only
* using 16 bits for an error code, since that's
* all the space we have in the sks field.
*/
ctl_set_internal_failure(&io->scsiio,
/*sks_valid*/ 1,
/*retry_count*/
io->io_hdr.port_status);
}
/*
* 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. 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.
*/
mtx_lock(&be_lun->queue_lock);
/*
* XXX KDM make sure that links is okay to use at this point.
* Otherwise, we either need to add another field to ctl_io_hdr,
* or deal with resource allocation here.
*/
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;
struct ctl_be_block_lun *be_lun;
union ctl_io *io;
int error;
beio = bio->bio_caller1;
be_lun = beio->lun;
io = beio->io;
DPRINTF("entered\n");
error = bio->bio_error;
mtx_lock(&be_lun->io_lock);
if (error != 0)
beio->num_errors++;
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.
*/
if (beio->num_errors > 0) {
if (error == EOPNOTSUPP) {
ctl_set_invalid_opcode(&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);
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 {
#ifdef CTL_TIME_IO
getbintime(&io->io_hdr.dma_start_bt);
#endif
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);
mtx_lock(&be_lun->io_lock);
devstat_start_transaction(beio->lun->disk_stats, &beio->ds_t0);
mtx_unlock(&be_lun->io_lock);
(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, MNT_WAIT, curthread);
VOP_UNLOCK(be_lun->vn, 0);
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, kernel, read, file_start, "uint64_t");
SDT_PROBE_DEFINE1(cbb, kernel, write, file_start, "uint64_t");
SDT_PROBE_DEFINE1(cbb, kernel, read, file_done,"uint64_t");
SDT_PROBE_DEFINE1(cbb, kernel, 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_block_filedata *file_data;
union ctl_io *io;
struct uio xuio;
struct iovec *xiovec;
int flags;
int error, i;
DPRINTF("entered\n");
file_data = &be_lun->backend.file;
io = beio->io;
flags = beio->bio_flags;
bzero(&xuio, sizeof(xuio));
if (beio->bio_cmd == BIO_READ) {
SDT_PROBE(cbb, kernel, read, file_start, 0, 0, 0, 0, 0);
xuio.uio_rw = UIO_READ;
} else {
SDT_PROBE(cbb, kernel, write, file_start, 0, 0, 0, 0, 0);
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);
mtx_lock(&be_lun->io_lock);
devstat_start_transaction(beio->lun->disk_stats, &beio->ds_t0);
mtx_unlock(&be_lun->io_lock);
if (beio->bio_cmd == BIO_READ) {
vn_lock(be_lun->vn, LK_SHARED | LK_RETRY);
/*
* 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.
*
* So, to attempt to provide some barrier semantics in the
* BIO_ORDERED case, set both IO_DIRECT and IO_SYNC.
*/
error = VOP_READ(be_lun->vn, &xuio, (flags & BIO_ORDERED) ?
(IO_DIRECT|IO_SYNC) : 0, file_data->cred);
VOP_UNLOCK(be_lun->vn, 0);
SDT_PROBE(cbb, kernel, read, file_done, 0, 0, 0, 0, 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.
*
* So if we've got the BIO_ORDERED flag set, we want
* IO_SYNC in either the UFS or ZFS case.
*/
error = VOP_WRITE(be_lun->vn, &xuio, (flags & BIO_ORDERED) ?
IO_SYNC : 0, file_data->cred);
VOP_UNLOCK(be_lun->vn, 0);
vn_finished_write(mountpoint);
SDT_PROBE(cbb, kernel, write, file_done, 0, 0, 0, 0, 0);
}
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) {
char path_str[32];
ctl_scsi_path_string(io, path_str, sizeof(path_str));
/*
* XXX KDM ZFS returns ENOSPC when the underlying
* filesystem fills up. What kind of SCSI error should we
* return for that?
*/
printf("%s%s command returned errno %d\n", path_str,
(beio->bio_cmd == BIO_READ) ? "READ" : "WRITE", error);
ctl_set_medium_error(&io->scsiio);
ctl_complete_beio(beio);
return;
}
/*
* If this is a write, we're all done.
* If this is a read, we can now send the data to the user.
*/
if (ARGS(io)->flags & (CTL_LLF_WRITE | CTL_LLF_VERIFY)) {
ctl_set_success(&io->scsiio);
ctl_complete_beio(beio);
} else {
#ifdef CTL_TIME_IO
getbintime(&io->io_hdr.dma_start_bt);
#endif
ctl_datamove(io);
}
}
static void
ctl_be_block_flush_dev(struct ctl_be_block_lun *be_lun,
struct ctl_be_block_io *beio)
{
struct bio *bio;
union ctl_io *io;
struct ctl_be_block_devdata *dev_data;
dev_data = &be_lun->backend.dev;
io = beio->io;
DPRINTF("entered\n");
/* This can't fail, it's a blocking allocation. */
bio = g_alloc_bio();
bio->bio_cmd = BIO_FLUSH;
bio->bio_flags |= BIO_ORDERED;
bio->bio_dev = dev_data->cdev;
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);
mtx_lock(&be_lun->io_lock);
devstat_start_transaction(be_lun->disk_stats, &beio->ds_t0);
mtx_unlock(&be_lun->io_lock);
(*dev_data->csw->d_strategy)(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;
struct ctl_be_block_devdata *dev_data;
uint64_t maxlen;
dev_data = &be_lun->backend.dev;
maxlen = LONG_MAX - (LONG_MAX % be_lun->blocksize);
while (len > 0) {
bio = g_alloc_bio();
bio->bio_cmd = BIO_DELETE;
bio->bio_flags |= beio->bio_flags;
bio->bio_dev = dev_data->cdev;
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->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);
(*dev_data->csw->d_strategy)(bio);
}
}
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_be_block_devdata *dev_data;
struct ctl_ptr_len_flags *ptrlen;
struct scsi_unmap_desc *buf, *end;
uint64_t len;
dev_data = &be_lun->backend.dev;
io = beio->io;
DPRINTF("entered\n");
binuptime(&beio->ds_t0);
mtx_lock(&be_lun->io_lock);
devstat_start_transaction(be_lun->disk_stats, &beio->ds_t0);
mtx_unlock(&be_lun->io_lock);
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->blocksize;
beio->io_len += len;
ctl_be_block_unmap_dev_range(be_lun, beio,
scsi_8btou64(buf->lba) * be_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);
int i;
struct bio *bio;
struct ctl_be_block_devdata *dev_data;
off_t cur_offset;
int max_iosize;
DPRINTF("entered\n");
dev_data = &be_lun->backend.dev;
/*
* We have to limit our I/O size to the maximum supported by the
* backend device. Hopefully it is MAXPHYS. If the driver doesn't
* set it properly, use DFLTPHYS.
*/
max_iosize = dev_data->cdev->si_iosize_max;
if (max_iosize < PAGE_SIZE)
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_flags |= beio->bio_flags;
bio->bio_dev = dev_data->cdev;
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->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++;
}
}
binuptime(&beio->ds_t0);
mtx_lock(&be_lun->io_lock);
devstat_start_transaction(be_lun->disk_stats, &beio->ds_t0);
beio->send_complete = 1;
mtx_unlock(&be_lun->io_lock);
/*
* Fire off all allocated requests!
*/
while ((bio = TAILQ_FIRST(&queue)) != NULL) {
TAILQ_REMOVE(&queue, bio, bio_queue);
(*dev_data->csw->d_strategy)(bio);
}
}
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_io *beio;
struct ctl_be_block_softc *softc;
struct ctl_lba_len_flags *lbalen;
uint64_t len_left, lba;
int i, seglen;
uint8_t *buf, *end;
DPRINTF("entered\n");
beio = (struct ctl_be_block_io *)PRIV(io)->ptr;
softc = be_lun->softc;
lbalen = ARGS(beio->io);
if (lbalen->flags & ~(SWS_LBDATA | SWS_UNMAP) ||
(lbalen->flags & SWS_UNMAP && 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 the I/O came down with an ordered or head of queue tag, set
* the BIO_ORDERED attribute. For head of queue tags, that's
* pretty much the best we can do.
*/
if ((io->scsiio.tag_type == CTL_TAG_ORDERED)
|| (io->scsiio.tag_type == CTL_TAG_HEAD_OF_QUEUE))
beio->bio_flags = BIO_ORDERED;
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 & SWS_UNMAP) {
beio->io_offset = lbalen->lba * be_lun->blocksize;
beio->io_len = (uint64_t)lbalen->len * be_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);
len_left = (uint64_t)lbalen->len * be_lun->blocksize;
for (i = 0, lba = 0; i < CTLBLK_MAX_SEGS && len_left > 0; i++) {
/*
* Setup the S/G entry for this chunk.
*/
seglen = MIN(CTLBLK_MAX_SEG, len_left);
seglen -= seglen % be_lun->blocksize;
beio->sg_segs[i].len = seglen;
beio->sg_segs[i].addr = uma_zalloc(be_lun->lun_zone, M_WAITOK);
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 += be_lun->blocksize) {
memcpy(buf, io->scsiio.kern_data_ptr, be_lun->blocksize);
if (lbalen->flags & SWS_LBDATA)
scsi_ulto4b(lbalen->lba + lba, buf);
lba++;
}
}
beio->io_offset = lbalen->lba * be_lun->blocksize;
beio->io_len = lba * be_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_be_block_softc *softc;
struct ctl_ptr_len_flags *ptrlen;
DPRINTF("entered\n");
beio = (struct ctl_be_block_io *)PRIV(io)->ptr;
softc = be_lun->softc;
ptrlen = (struct ctl_ptr_len_flags *)&io->io_hdr.ctl_private[CTL_PRIV_LBA_LEN];
if (ptrlen->flags != 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;
}
/*
* If the I/O came down with an ordered or head of queue tag, set
* the BIO_ORDERED attribute. For head of queue tags, that's
* pretty much the best we can do.
*/
if ((io->scsiio.tag_type == CTL_TAG_ORDERED)
|| (io->scsiio.tag_type == CTL_TAG_HEAD_OF_QUEUE))
beio->bio_flags = BIO_ORDERED;
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;
}
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_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;
PRIV(io)->ptr = (void *)beio;
switch (io->scsiio.cdb[0]) {
case SYNCHRONIZE_CACHE:
case SYNCHRONIZE_CACHE_16:
beio->bio_cmd = BIO_FLUSH;
beio->ds_trans_type = DEVSTAT_NO_DATA;
beio->ds_tag_type = DEVSTAT_TAG_ORDERED;
beio->io_len = 0;
be_lun->lun_flush(be_lun, beio);
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, kernel, read, start, "uint64_t");
SDT_PROBE_DEFINE1(cbb, kernel, write, start, "uint64_t");
SDT_PROBE_DEFINE1(cbb, kernel, read, alloc_done, "uint64_t");
SDT_PROBE_DEFINE1(cbb, kernel, 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);
/*
* XXX KDM make sure that links is okay to use at this point.
* Otherwise, we either need to add another field to ctl_io_hdr,
* or deal with resource allocation here.
*/
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_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_PROBE(cbb, kernel, write, start, 0, 0, 0, 0, 0);
} else {
SDT_PROBE(cbb, kernel, read, start, 0, 0, 0, 0, 0);
}
beio = ctl_alloc_beio(softc);
beio->io = io;
beio->lun = be_lun;
bptrlen = PRIV(io);
bptrlen->ptr = (void *)beio;
/*
* If the I/O came down with an ordered or head of queue tag, set
* the BIO_ORDERED attribute. For head of queue tags, that's
* pretty much the best we can do.
*
* XXX KDM we don't have a great way to easily know about the FUA
* bit right now (it is decoded in ctl_read_write(), but we don't
* pass that knowledge to the backend), and in any case we would
* need to determine how to handle it.
*/
if ((io->scsiio.tag_type == CTL_TAG_ORDERED)
|| (io->scsiio.tag_type == CTL_TAG_HEAD_OF_QUEUE))
beio->bio_flags = BIO_ORDERED;
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)
lbas = CTLBLK_HALF_IO_SIZE;
else
lbas = CTLBLK_MAX_IO_SIZE;
lbas = MIN(lbalen->len - bptrlen->len, lbas / be_lun->blocksize);
beio->io_offset = (lbalen->lba + bptrlen->len) * be_lun->blocksize;
beio->io_len = lbas * be_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.
*/
beio->sg_segs[i].len = min(CTLBLK_MAX_SEG, len_left);
beio->sg_segs[i].addr = uma_zalloc(be_lun->lun_zone, M_WAITOK);
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 (lbalen->flags & CTL_LLF_COMPARE) {
beio->sg_segs[i + CTLBLK_HALF_SEGS].len =
beio->sg_segs[i].len;
beio->sg_segs[i + CTLBLK_HALF_SEGS].addr =
uma_zalloc(be_lun->lun_zone, M_WAITOK);
}
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 (lbalen->flags & CTL_LLF_COMPARE)
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_data_resid = 0;
io->scsiio.kern_sg_entries = beio->num_segs;
io->io_hdr.flags |= CTL_FLAG_ALLOCATED | CTL_FLAG_KDPTR_SGLIST;
/*
* 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_PROBE(cbb, kernel, read, alloc_done, 0, 0, 0, 0, 0);
be_lun->dispatch(be_lun, beio);
} else {
SDT_PROBE(cbb, kernel, write, alloc_done, 0, 0, 0, 0, 0);
#ifdef CTL_TIME_IO
getbintime(&io->io_hdr.dma_start_bt);
#endif
ctl_datamove(io);
}
}
static void
ctl_be_block_worker(void *context, int pending)
{
struct ctl_be_block_lun *be_lun;
struct ctl_be_block_softc *softc;
union ctl_io *io;
be_lun = (struct ctl_be_block_lun *)context;
softc = be_lun->softc;
DPRINTF("entered\n");
mtx_lock(&be_lun->queue_lock);
for (;;) {
io = (union ctl_io *)STAILQ_FIRST(&be_lun->datamove_queue);
if (io != NULL) {
struct ctl_be_block_io *beio;
DPRINTF("datamove queue\n");
STAILQ_REMOVE(&be_lun->datamove_queue, &io->io_hdr,
ctl_io_hdr, links);
mtx_unlock(&be_lun->queue_lock);
beio = (struct ctl_be_block_io *)PRIV(io)->ptr;
be_lun->dispatch(be_lun, beio);
mtx_lock(&be_lun->queue_lock);
continue;
}
io = (union ctl_io *)STAILQ_FIRST(&be_lun->config_write_queue);
if (io != NULL) {
DPRINTF("config write queue\n");
STAILQ_REMOVE(&be_lun->config_write_queue, &io->io_hdr,
ctl_io_hdr, links);
mtx_unlock(&be_lun->queue_lock);
ctl_be_block_cw_dispatch(be_lun, io);
mtx_lock(&be_lun->queue_lock);
continue;
}
io = (union ctl_io *)STAILQ_FIRST(&be_lun->input_queue);
if (io != NULL) {
DPRINTF("input queue\n");
STAILQ_REMOVE(&be_lun->input_queue, &io->io_hdr,
ctl_io_hdr, links);
mtx_unlock(&be_lun->queue_lock);
/*
* We must drop the lock, since this routine and
* its children may sleep.
*/
ctl_be_block_dispatch(be_lun, io);
mtx_lock(&be_lun->queue_lock);
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.
*/
break;
}
mtx_unlock(&be_lun->queue_lock);
}
/*
* 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;
struct ctl_be_lun *ctl_be_lun;
DPRINTF("entered\n");
ctl_be_lun = (struct ctl_be_lun *)io->io_hdr.ctl_private[
CTL_PRIV_BACKEND_LUN].ptr;
be_lun = (struct ctl_be_block_lun *)ctl_be_lun->be_lun;
/*
* Make sure we only get SCSI I/O.
*/
KASSERT(io->io_hdr.io_type == CTL_IO_SCSI, ("Non-SCSI I/O (type "
"%#x) encountered", io->io_hdr.io_type));
PRIV(io)->len = 0;
mtx_lock(&be_lun->queue_lock);
/*
* XXX KDM make sure that links is okay to use at this point.
* Otherwise, we either need to add another field to ctl_io_hdr,
* or deal with resource allocation here.
*/
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;
int error;
softc = &backend_block_softc;
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),
"%s: invalid LUN request type %d", __func__,
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_block_filedata *file_data;
struct ctl_lun_create_params *params;
struct vattr vattr;
int error;
error = 0;
file_data = &be_lun->backend.file;
params = &req->reqdata.create;
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;
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);
}
/*
* Verify that we have the ability to upgrade to exclusive
* access on this file so we can trap errors at open instead
* of reporting them during first access.
*/
if (VOP_ISLOCKED(be_lun->vn) != LK_EXCLUSIVE) {
vn_lock(be_lun->vn, LK_UPGRADE | LK_RETRY);
if (be_lun->vn->v_iflag & VI_DOOMED) {
error = EBADF;
snprintf(req->error_str, sizeof(req->error_str),
"error locking 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;
/*
* We set the multi thread flag for file operations because all
* filesystems (in theory) are capable of allowing multiple readers
* of a file at once. So we want to get the maximum possible
* concurrency.
*/
be_lun->flags |= CTL_BE_BLOCK_LUN_MULTI_THREAD;
/*
* XXX KDM vattr.va_blocksize may be larger than 512 bytes here.
* With ZFS, it is 131072 bytes. Block sizes that large don't work
* with disklabel and UFS on FreeBSD at least. Large block sizes
* may not work with other OSes as well. So just export a sector
* size of 512 bytes, which should work with any OS or
* application. Since our backing is a file, any block size will
* work fine for the backing store.
*/
#if 0
be_lun->blocksize= vattr.va_blocksize;
#endif
if (params->blocksize_bytes != 0)
be_lun->blocksize = params->blocksize_bytes;
else
be_lun->blocksize = 512;
/*
* Sanity check. The media size has to be at least one
* sector long.
*/
if (be_lun->size_bytes < be_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, be_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_lun_create_params *params;
struct vattr vattr;
struct cdev *dev;
struct cdevsw *devsw;
int error;
off_t ps, pss, po, pos;
params = &req->reqdata.create;
be_lun->dev_type = CTL_BE_BLOCK_DEV;
be_lun->dispatch = ctl_be_block_dispatch_dev;
be_lun->lun_flush = ctl_be_block_flush_dev;
be_lun->unmap = ctl_be_block_unmap_dev;
be_lun->backend.dev.cdev = be_lun->vn->v_rdev;
be_lun->backend.dev.csw = dev_refthread(be_lun->backend.dev.cdev,
&be_lun->backend.dev.dev_ref);
if (be_lun->backend.dev.csw == NULL)
panic("Unable to retrieve device switch");
error = VOP_GETATTR(be_lun->vn, &vattr, NOCRED);
if (error) {
snprintf(req->error_str, sizeof(req->error_str),
"%s: error getting vnode attributes for device %s",
__func__, be_lun->dev_path);
return (error);
}
dev = be_lun->vn->v_rdev;
devsw = dev->si_devsw;
if (!devsw->d_ioctl) {
snprintf(req->error_str, sizeof(req->error_str),
"%s: no d_ioctl for device %s!", __func__,
be_lun->dev_path);
return (ENODEV);
}
error = devsw->d_ioctl(dev, DIOCGSECTORSIZE,
(caddr_t)&be_lun->blocksize, FREAD,
curthread);
if (error) {
snprintf(req->error_str, sizeof(req->error_str),
"%s: error %d returned for DIOCGSECTORSIZE ioctl "
"on %s!", __func__, 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 > be_lun->blocksize)) {
uint32_t bs_multiple, tmp_blocksize;
bs_multiple = params->blocksize_bytes / be_lun->blocksize;
tmp_blocksize = bs_multiple * be_lun->blocksize;
if (tmp_blocksize == params->blocksize_bytes) {
be_lun->blocksize = params->blocksize_bytes;
} else {
snprintf(req->error_str, sizeof(req->error_str),
"%s: requested blocksize %u is not an even "
"multiple of backing device blocksize %u",
__func__, params->blocksize_bytes,
be_lun->blocksize);
return (EINVAL);
}
} else if ((params->blocksize_bytes != 0)
&& (params->blocksize_bytes != be_lun->blocksize)) {
snprintf(req->error_str, sizeof(req->error_str),
"%s: requested blocksize %u < backing device "
"blocksize %u", __func__, params->blocksize_bytes,
be_lun->blocksize);
return (EINVAL);
}
error = devsw->d_ioctl(dev, DIOCGMEDIASIZE,
(caddr_t)&be_lun->size_bytes, FREAD,
curthread);
if (error) {
snprintf(req->error_str, sizeof(req->error_str),
"%s: error %d returned for DIOCGMEDIASIZE "
" ioctl on %s!", __func__, error,
be_lun->dev_path);
return (error);
}
if (params->lun_size_bytes != 0) {
if (params->lun_size_bytes > be_lun->size_bytes) {
snprintf(req->error_str, sizeof(req->error_str),
"%s: requested LUN size %ju > backing device "
"size %ju", __func__,
(uintmax_t)params->lun_size_bytes,
(uintmax_t)be_lun->size_bytes);
return (EINVAL);
}
be_lun->size_bytes = params->lun_size_bytes;
}
error = devsw->d_ioctl(dev, DIOCGSTRIPESIZE,
(caddr_t)&ps, FREAD, curthread);
if (error)
ps = po = 0;
else {
error = devsw->d_ioctl(dev, DIOCGSTRIPEOFFSET,
(caddr_t)&po, FREAD, curthread);
if (error)
po = 0;
}
pss = ps / be_lun->blocksize;
pos = po / be_lun->blocksize;
if ((pss > 0) && (pss * be_lun->blocksize == ps) && (pss >= pos) &&
((pss & (pss - 1)) == 0) && (pos * be_lun->blocksize == po)) {
be_lun->pblockexp = fls(pss) - 1;
be_lun->pblockoff = (pss - pos) % pss;
}
return (0);
}
static int
ctl_be_block_close(struct ctl_be_block_lun *be_lun)
{
DROP_GIANT();
if (be_lun->vn) {
int flags = FREAD | FWRITE;
switch (be_lun->dev_type) {
case CTL_BE_BLOCK_DEV:
if (be_lun->backend.dev.csw) {
dev_relthread(be_lun->backend.dev.cdev,
be_lun->backend.dev.dev_ref);
be_lun->backend.dev.csw = NULL;
be_lun->backend.dev.cdev = NULL;
}
break;
case CTL_BE_BLOCK_FILE:
break;
case CTL_BE_BLOCK_NONE:
break;
default:
panic("Unexpected backend type.");
break;
}
(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.");
break;
}
}
PICKUP_GIANT();
return (0);
}
static int
ctl_be_block_open(struct ctl_be_block_softc *softc,
struct ctl_be_block_lun *be_lun, struct ctl_lun_req *req)
{
struct nameidata nd;
int flags;
int error;
/*
* XXX KDM allow a read-only option?
*/
flags = FREAD | FWRITE;
error = 0;
if (rootvnode == NULL) {
snprintf(req->error_str, sizeof(req->error_str),
"%s: Root filesystem is not mounted", __func__);
return (1);
}
if (!curthread->td_proc->p_fd->fd_cdir) {
curthread->td_proc->p_fd->fd_cdir = rootvnode;
VREF(rootvnode);
}
if (!curthread->td_proc->p_fd->fd_rdir) {
curthread->td_proc->p_fd->fd_rdir = rootvnode;
VREF(rootvnode);
}
if (!curthread->td_proc->p_fd->fd_jdir) {
curthread->td_proc->p_fd->fd_jdir = rootvnode;
VREF(rootvnode);
}
again:
NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, be_lun->dev_path, curthread);
error = vn_open(&nd, &flags, 0, NULL);
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_path = "/dev/";
char *dev_name;
/* Try adding device path at beginning of name */
dev_name = malloc(strlen(be_lun->dev_path)
+ strlen(dev_path) + 1,
M_CTLBLK, M_WAITOK);
if (dev_name) {
sprintf(dev_name, "%s%s", dev_path,
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),
"%s: error opening %s", __func__, be_lun->dev_path);
return (error);
}
NDFREE(&nd, NDF_ONLY_PNBUF);
be_lun->vn = nd.ni_vp;
/* We only support disks and files. */
if (vn_isdisk(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, 0);
if (error != 0) {
ctl_be_block_close(be_lun);
return (error);
}
be_lun->blocksize_shift = fls(be_lun->blocksize) - 1;
be_lun->size_blocks = be_lun->size_bytes >> be_lun->blocksize_shift;
return (0);
}
static int
ctl_be_block_create(struct ctl_be_block_softc *softc, struct ctl_lun_req *req)
{
struct ctl_be_block_lun *be_lun;
struct ctl_lun_create_params *params;
char num_thread_str[16];
char tmpstr[32];
char *value;
int retval, num_threads, unmap;
int tmp_num_threads;
params = &req->reqdata.create;
retval = 0;
num_threads = cbb_num_threads;
be_lun = malloc(sizeof(*be_lun), M_CTLBLK, M_ZERO | M_WAITOK);
be_lun->softc = softc;
STAILQ_INIT(&be_lun->input_queue);
STAILQ_INIT(&be_lun->config_write_queue);
STAILQ_INIT(&be_lun->datamove_queue);
sprintf(be_lun->lunname, "cblk%d", softc->num_luns);
mtx_init(&be_lun->io_lock, "cblk io lock", NULL, MTX_DEF);
mtx_init(&be_lun->queue_lock, "cblk queue lock", NULL, MTX_DEF);
ctl_init_opts(&be_lun->ctl_be_lun, req);
be_lun->lun_zone = uma_zcreate(be_lun->lunname, CTLBLK_MAX_SEG,
NULL, NULL, NULL, NULL, /*align*/ 0, /*flags*/0);
if (be_lun->lun_zone == NULL) {
snprintf(req->error_str, sizeof(req->error_str),
"%s: error allocating UMA zone", __func__);
goto bailout_error;
}
if (params->flags & CTL_LUN_FLAG_DEV_TYPE)
be_lun->ctl_be_lun.lun_type = params->device_type;
else
be_lun->ctl_be_lun.lun_type = T_DIRECT;
if (be_lun->ctl_be_lun.lun_type == T_DIRECT) {
value = ctl_get_opt(&be_lun->ctl_be_lun, "file");
if (value == NULL) {
snprintf(req->error_str, sizeof(req->error_str),
"%s: no file argument specified", __func__);
goto bailout_error;
}
be_lun->dev_path = strdup(value, M_CTLBLK);
retval = ctl_be_block_open(softc, be_lun, req);
if (retval != 0) {
retval = 0;
goto bailout_error;
}
/*
* Tell the user the size of the file/device.
*/
params->lun_size_bytes = be_lun->size_bytes;
/*
* The maximum LBA is the size - 1.
*/
be_lun->ctl_be_lun.maxlba = be_lun->size_blocks - 1;
} else {
/*
* For processor devices, we don't have any size.
*/
be_lun->blocksize = 0;
be_lun->pblockexp = 0;
be_lun->pblockoff = 0;
be_lun->size_blocks = 0;
be_lun->size_bytes = 0;
be_lun->ctl_be_lun.maxlba = 0;
params->lun_size_bytes = 0;
/*
* Default to just 1 thread for processor devices.
*/
num_threads = 1;
}
/*
* XXX This searching loop might be refactored to be combined with
* the loop above,
*/
value = ctl_get_opt(&be_lun->ctl_be_lun, "num_threads");
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),
"%s: invalid number of threads %s",
__func__, num_thread_str);
goto bailout_error;
}
num_threads = tmp_num_threads;
}
unmap = 0;
value = ctl_get_opt(&be_lun->ctl_be_lun, "unmap");
if (value != NULL && strcmp(value, "on") == 0)
unmap = 1;
be_lun->flags = CTL_BE_BLOCK_LUN_UNCONFIGURED;
be_lun->ctl_be_lun.flags = CTL_LUN_FLAG_PRIMARY;
if (unmap)
be_lun->ctl_be_lun.flags |= CTL_LUN_FLAG_UNMAP;
be_lun->ctl_be_lun.be_lun = be_lun;
be_lun->ctl_be_lun.blocksize = be_lun->blocksize;
be_lun->ctl_be_lun.pblockexp = be_lun->pblockexp;
be_lun->ctl_be_lun.pblockoff = be_lun->pblockoff;
/* Tell the user the blocksize we ended up using */
params->blocksize_bytes = be_lun->blocksize;
if (params->flags & CTL_LUN_FLAG_ID_REQ) {
be_lun->ctl_be_lun.req_lun_id = params->req_lun_id;
be_lun->ctl_be_lun.flags |= CTL_LUN_FLAG_ID_REQ;
} else
be_lun->ctl_be_lun.req_lun_id = 0;
be_lun->ctl_be_lun.lun_shutdown = ctl_be_block_lun_shutdown;
be_lun->ctl_be_lun.lun_config_status =
ctl_be_block_lun_config_status;
be_lun->ctl_be_lun.be = &ctl_be_block_driver;
if ((params->flags & CTL_LUN_FLAG_SERIAL_NUM) == 0) {
snprintf(tmpstr, sizeof(tmpstr), "MYSERIAL%4d",
softc->num_luns);
strncpy((char *)be_lun->ctl_be_lun.serial_num, tmpstr,
ctl_min(sizeof(be_lun->ctl_be_lun.serial_num),
sizeof(tmpstr)));
/* Tell the user what we used for a serial number */
strncpy((char *)params->serial_num, tmpstr,
ctl_min(sizeof(params->serial_num), sizeof(tmpstr)));
} else {
strncpy((char *)be_lun->ctl_be_lun.serial_num,
params->serial_num,
ctl_min(sizeof(be_lun->ctl_be_lun.serial_num),
sizeof(params->serial_num)));
}
if ((params->flags & CTL_LUN_FLAG_DEVID) == 0) {
snprintf(tmpstr, sizeof(tmpstr), "MYDEVID%4d", softc->num_luns);
strncpy((char *)be_lun->ctl_be_lun.device_id, tmpstr,
ctl_min(sizeof(be_lun->ctl_be_lun.device_id),
sizeof(tmpstr)));
/* Tell the user what we used for a device ID */
strncpy((char *)params->device_id, tmpstr,
ctl_min(sizeof(params->device_id), sizeof(tmpstr)));
} else {
strncpy((char *)be_lun->ctl_be_lun.device_id,
params->device_id,
ctl_min(sizeof(be_lun->ctl_be_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(be_lun->lunname, M_WAITOK,
taskqueue_thread_enqueue, /*context*/&be_lun->io_taskqueue);
if (be_lun->io_taskqueue == NULL) {
snprintf(req->error_str, sizeof(req->error_str),
"%s: Unable to create taskqueue", __func__);
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(&be_lun->io_taskqueue,
/*num threads*/num_threads,
/*priority*/PWAIT,
/*thread name*/
"%s taskq", be_lun->lunname);
if (retval != 0)
goto bailout_error;
be_lun->num_threads = num_threads;
mtx_lock(&softc->lock);
softc->num_luns++;
STAILQ_INSERT_TAIL(&softc->lun_list, be_lun, links);
mtx_unlock(&softc->lock);
retval = ctl_add_lun(&be_lun->ctl_be_lun);
if (retval != 0) {
mtx_lock(&softc->lock);
STAILQ_REMOVE(&softc->lun_list, be_lun, ctl_be_block_lun,
links);
softc->num_luns--;
mtx_unlock(&softc->lock);
snprintf(req->error_str, sizeof(req->error_str),
"%s: ctl_add_lun() returned error %d, see dmesg for "
"details", __func__, retval);
retval = 0;
goto bailout_error;
}
mtx_lock(&softc->lock);
/*
* Tell the config_status routine that we're waiting so it won't
* clean up the LUN in the event of an error.
*/
be_lun->flags |= CTL_BE_BLOCK_LUN_WAITING;
while (be_lun->flags & CTL_BE_BLOCK_LUN_UNCONFIGURED) {
retval = msleep(be_lun, &softc->lock, PCATCH, "ctlblk", 0);
if (retval == EINTR)
break;
}
be_lun->flags &= ~CTL_BE_BLOCK_LUN_WAITING;
if (be_lun->flags & CTL_BE_BLOCK_LUN_CONFIG_ERR) {
snprintf(req->error_str, sizeof(req->error_str),
"%s: LUN configuration error, see dmesg for details",
__func__);
STAILQ_REMOVE(&softc->lun_list, be_lun, ctl_be_block_lun,
links);
softc->num_luns--;
mtx_unlock(&softc->lock);
goto bailout_error;
} else {
params->req_lun_id = be_lun->ctl_be_lun.lun_id;
}
mtx_unlock(&softc->lock);
be_lun->disk_stats = devstat_new_entry("cbb", params->req_lun_id,
be_lun->blocksize,
DEVSTAT_ALL_SUPPORTED,
be_lun->ctl_be_lun.lun_type
| DEVSTAT_TYPE_IF_OTHER,
DEVSTAT_PRIORITY_OTHER);
req->status = CTL_LUN_OK;
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);
if (be_lun->lun_zone != NULL)
uma_zdestroy(be_lun->lun_zone);
ctl_free_opts(&be_lun->ctl_be_lun);
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;
int retval;
params = &req->reqdata.rm;
mtx_lock(&softc->lock);
be_lun = NULL;
STAILQ_FOREACH(be_lun, &softc->lun_list, links) {
if (be_lun->ctl_be_lun.lun_id == params->lun_id)
break;
}
mtx_unlock(&softc->lock);
if (be_lun == NULL) {
snprintf(req->error_str, sizeof(req->error_str),
"%s: LUN %u is not managed by the block backend",
__func__, params->lun_id);
goto bailout_error;
}
retval = ctl_disable_lun(&be_lun->ctl_be_lun);
if (retval != 0) {
snprintf(req->error_str, sizeof(req->error_str),
"%s: error %d returned from ctl_disable_lun() for "
"LUN %d", __func__, retval, params->lun_id);
goto bailout_error;
}
retval = ctl_invalidate_lun(&be_lun->ctl_be_lun);
if (retval != 0) {
snprintf(req->error_str, sizeof(req->error_str),
"%s: error %d returned from ctl_invalidate_lun() for "
"LUN %d", __func__, retval, params->lun_id);
goto bailout_error;
}
mtx_lock(&softc->lock);
be_lun->flags |= CTL_BE_BLOCK_LUN_WAITING;
while ((be_lun->flags & CTL_BE_BLOCK_LUN_UNCONFIGURED) == 0) {
retval = msleep(be_lun, &softc->lock, PCATCH, "ctlblk", 0);
if (retval == EINTR)
break;
}
be_lun->flags &= ~CTL_BE_BLOCK_LUN_WAITING;
if ((be_lun->flags & CTL_BE_BLOCK_LUN_UNCONFIGURED) == 0) {
snprintf(req->error_str, sizeof(req->error_str),
"%s: interrupted waiting for LUN to be freed",
__func__);
mtx_unlock(&softc->lock);
goto bailout_error;
}
STAILQ_REMOVE(&softc->lun_list, be_lun, ctl_be_block_lun, links);
softc->num_luns--;
mtx_unlock(&softc->lock);
taskqueue_drain(be_lun->io_taskqueue, &be_lun->io_task);
taskqueue_free(be_lun->io_taskqueue);
ctl_be_block_close(be_lun);
if (be_lun->disk_stats != NULL)
devstat_remove_entry(be_lun->disk_stats);
uma_zdestroy(be_lun->lun_zone);
ctl_free_opts(&be_lun->ctl_be_lun);
free(be_lun->dev_path, M_CTLBLK);
mtx_destroy(&be_lun->queue_lock);
mtx_destroy(&be_lun->io_lock);
free(be_lun, M_CTLBLK);
req->status = CTL_LUN_OK;
return (0);
bailout_error:
req->status = CTL_LUN_ERROR;
return (0);
}
static int
ctl_be_block_modify_file(struct ctl_be_block_lun *be_lun,
struct ctl_lun_req *req)
{
struct vattr vattr;
int error;
struct ctl_lun_modify_params *params;
params = &req->reqdata.modify;
if (params->lun_size_bytes != 0) {
be_lun->size_bytes = params->lun_size_bytes;
} else {
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);
}
be_lun->size_bytes = vattr.va_size;
}
return (0);
}
static int
ctl_be_block_modify_dev(struct ctl_be_block_lun *be_lun,
struct ctl_lun_req *req)
{
struct cdev *dev;
struct cdevsw *devsw;
int error;
struct ctl_lun_modify_params *params;
uint64_t size_bytes;
params = &req->reqdata.modify;
dev = be_lun->vn->v_rdev;
devsw = dev->si_devsw;
if (!devsw->d_ioctl) {
snprintf(req->error_str, sizeof(req->error_str),
"%s: no d_ioctl for device %s!", __func__,
be_lun->dev_path);
return (ENODEV);
}
error = devsw->d_ioctl(dev, DIOCGMEDIASIZE,
(caddr_t)&size_bytes, FREAD,
curthread);
if (error) {
snprintf(req->error_str, sizeof(req->error_str),
"%s: error %d returned for DIOCGMEDIASIZE ioctl "
"on %s!", __func__, error, be_lun->dev_path);
return (error);
}
if (params->lun_size_bytes != 0) {
if (params->lun_size_bytes > size_bytes) {
snprintf(req->error_str, sizeof(req->error_str),
"%s: requested LUN size %ju > backing device "
"size %ju", __func__,
(uintmax_t)params->lun_size_bytes,
(uintmax_t)size_bytes);
return (EINVAL);
}
be_lun->size_bytes = params->lun_size_bytes;
} else {
be_lun->size_bytes = size_bytes;
}
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;
int error;
params = &req->reqdata.modify;
mtx_lock(&softc->lock);
be_lun = NULL;
STAILQ_FOREACH(be_lun, &softc->lun_list, links) {
if (be_lun->ctl_be_lun.lun_id == params->lun_id)
break;
}
mtx_unlock(&softc->lock);
if (be_lun == NULL) {
snprintf(req->error_str, sizeof(req->error_str),
"%s: LUN %u is not managed by the block backend",
__func__, params->lun_id);
goto bailout_error;
}
if (params->lun_size_bytes != 0) {
if (params->lun_size_bytes < be_lun->blocksize) {
snprintf(req->error_str, sizeof(req->error_str),
"%s: LUN size %ju < blocksize %u", __func__,
params->lun_size_bytes, be_lun->blocksize);
goto bailout_error;
}
}
vn_lock(be_lun->vn, LK_SHARED | LK_RETRY);
if (be_lun->vn->v_type == VREG)
error = ctl_be_block_modify_file(be_lun, req);
else
error = ctl_be_block_modify_dev(be_lun, req);
VOP_UNLOCK(be_lun->vn, 0);
if (error != 0)
goto bailout_error;
be_lun->size_blocks = be_lun->size_bytes >> be_lun->blocksize_shift;
/*
* The maximum LBA is the size - 1.
*
* XXX: Note that this field is being updated without locking,
* which might cause problems on 32-bit architectures.
*/
be_lun->ctl_be_lun.maxlba = be_lun->size_blocks - 1;
ctl_lun_capacity_changed(&be_lun->ctl_be_lun);
/* Tell the user the exact size we ended up using */
params->lun_size_bytes = be_lun->size_bytes;
req->status = CTL_LUN_OK;
return (0);
bailout_error:
req->status = CTL_LUN_ERROR;
return (0);
}
static void
ctl_be_block_lun_shutdown(void *be_lun)
{
struct ctl_be_block_lun *lun;
struct ctl_be_block_softc *softc;
lun = (struct ctl_be_block_lun *)be_lun;
softc = lun->softc;
mtx_lock(&softc->lock);
lun->flags |= CTL_BE_BLOCK_LUN_UNCONFIGURED;
if (lun->flags & CTL_BE_BLOCK_LUN_WAITING)
wakeup(lun);
mtx_unlock(&softc->lock);
}
static void
ctl_be_block_lun_config_status(void *be_lun, ctl_lun_config_status status)
{
struct ctl_be_block_lun *lun;
struct ctl_be_block_softc *softc;
lun = (struct ctl_be_block_lun *)be_lun;
softc = lun->softc;
if (status == CTL_LUN_CONFIG_OK) {
mtx_lock(&softc->lock);
lun->flags &= ~CTL_BE_BLOCK_LUN_UNCONFIGURED;
if (lun->flags & CTL_BE_BLOCK_LUN_WAITING)
wakeup(lun);
mtx_unlock(&softc->lock);
/*
* We successfully added the LUN, attempt to enable it.
*/
if (ctl_enable_lun(&lun->ctl_be_lun) != 0) {
printf("%s: ctl_enable_lun() failed!\n", __func__);
if (ctl_invalidate_lun(&lun->ctl_be_lun) != 0) {
printf("%s: ctl_invalidate_lun() failed!\n",
__func__);
}
}
return;
}
mtx_lock(&softc->lock);
lun->flags &= ~CTL_BE_BLOCK_LUN_UNCONFIGURED;
lun->flags |= CTL_BE_BLOCK_LUN_CONFIG_ERR;
wakeup(lun);
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 *ctl_be_lun;
int retval;
retval = 0;
DPRINTF("entered\n");
ctl_be_lun = (struct ctl_be_lun *)io->io_hdr.ctl_private[
CTL_PRIV_BACKEND_LUN].ptr;
be_lun = (struct ctl_be_block_lun *)ctl_be_lun->be_lun;
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;
cdb = (struct scsi_start_stop_unit *)io->scsiio.cdb;
if (cdb->how & SSS_START)
retval = ctl_start_lun(ctl_be_lun);
else {
retval = ctl_stop_lun(ctl_be_lun);
/*
* XXX KDM Copan-specific offline behavior.
* Figure out a reasonable way to port this?
*/
#ifdef NEEDTOPORT
if ((retval == 0)
&& (cdb->byte2 & SSS_ONOFFLINE))
retval = ctl_lun_offline(ctl_be_lun);
#endif
}
/*
* In general, the above routines should not fail. They
* just set state for the LUN. So we've got something
* pretty wrong here if we can't start or stop the LUN.
*/
if (retval != 0) {
ctl_set_internal_failure(&io->scsiio,
/*sks_valid*/ 1,
/*retry_count*/ 0xf051);
retval = CTL_RETVAL_COMPLETE;
} else {
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)
{
return (0);
}
static int
ctl_be_block_lun_info(void *be_lun, struct sbuf *sb)
{
struct ctl_be_block_lun *lun;
int retval;
lun = (struct ctl_be_block_lun *)be_lun;
retval = 0;
retval = sbuf_printf(sb, "<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>");
bailout:
return (retval);
}
int
ctl_be_block_init(void)
{
struct ctl_be_block_softc *softc;
int retval;
softc = &backend_block_softc;
retval = 0;
mtx_init(&softc->lock, "ctlblock", NULL, MTX_DEF);
beio_zone = uma_zcreate("beio", sizeof(struct ctl_be_block_io),
NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
STAILQ_INIT(&softc->disk_list);
STAILQ_INIT(&softc->lun_list);
return (retval);
}
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