- 根目录:
- drivers
- target
- target_core_iblock.c
/*******************************************************************************
* Filename: target_core_iblock.c
*
* This file contains the Storage Engine <-> Linux BlockIO transport
* specific functions.
*
* Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
* Copyright (c) 2005, 2006, 2007 SBE, Inc.
* Copyright (c) 2007-2010 Rising Tide Systems
* Copyright (c) 2008-2010 Linux-iSCSI.org
*
* Nicholas A. Bellinger <nab@kernel.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
******************************************************************************/
#include <linux/version.h>
#include <linux/string.h>
#include <linux/parser.h>
#include <linux/timer.h>
#include <linux/fs.h>
#include <linux/blkdev.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/bio.h>
#include <linux/genhd.h>
#include <linux/file.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <target/target_core_base.h>
#include <target/target_core_device.h>
#include <target/target_core_transport.h>
#include "target_core_iblock.h"
#if 0
#define DEBUG_IBLOCK(x...) printk(x)
#else
#define DEBUG_IBLOCK(x...)
#endif
static struct se_subsystem_api iblock_template;
static void iblock_bio_done(struct bio *, int);
/* iblock_attach_hba(): (Part of se_subsystem_api_t template)
*
*
*/
static int iblock_attach_hba(struct se_hba *hba, u32 host_id)
{
struct iblock_hba *ib_host;
ib_host = kzalloc(sizeof(struct iblock_hba), GFP_KERNEL);
if (!(ib_host)) {
printk(KERN_ERR "Unable to allocate memory for"
" struct iblock_hba\n");
return -ENOMEM;
}
ib_host->iblock_host_id = host_id;
atomic_set(&hba->left_queue_depth, IBLOCK_HBA_QUEUE_DEPTH);
atomic_set(&hba->max_queue_depth, IBLOCK_HBA_QUEUE_DEPTH);
hba->hba_ptr = (void *) ib_host;
printk(KERN_INFO "CORE_HBA[%d] - TCM iBlock HBA Driver %s on"
" Generic Target Core Stack %s\n", hba->hba_id,
IBLOCK_VERSION, TARGET_CORE_MOD_VERSION);
printk(KERN_INFO "CORE_HBA[%d] - Attached iBlock HBA: %u to Generic"
" Target Core TCQ Depth: %d\n", hba->hba_id,
ib_host->iblock_host_id, atomic_read(&hba->max_queue_depth));
return 0;
}
static void iblock_detach_hba(struct se_hba *hba)
{
struct iblock_hba *ib_host = hba->hba_ptr;
printk(KERN_INFO "CORE_HBA[%d] - Detached iBlock HBA: %u from Generic"
" Target Core\n", hba->hba_id, ib_host->iblock_host_id);
kfree(ib_host);
hba->hba_ptr = NULL;
}
static void *iblock_allocate_virtdevice(struct se_hba *hba, const char *name)
{
struct iblock_dev *ib_dev = NULL;
struct iblock_hba *ib_host = hba->hba_ptr;
ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL);
if (!(ib_dev)) {
printk(KERN_ERR "Unable to allocate struct iblock_dev\n");
return NULL;
}
ib_dev->ibd_host = ib_host;
printk(KERN_INFO "IBLOCK: Allocated ib_dev for %s\n", name);
return ib_dev;
}
static struct se_device *iblock_create_virtdevice(
struct se_hba *hba,
struct se_subsystem_dev *se_dev,
void *p)
{
struct iblock_dev *ib_dev = p;
struct se_device *dev;
struct se_dev_limits dev_limits;
struct block_device *bd = NULL;
struct request_queue *q;
struct queue_limits *limits;
u32 dev_flags = 0;
int ret = -EINVAL;
if (!(ib_dev)) {
printk(KERN_ERR "Unable to locate struct iblock_dev parameter\n");
return ERR_PTR(ret);
}
memset(&dev_limits, 0, sizeof(struct se_dev_limits));
/*
* These settings need to be made tunable..
*/
ib_dev->ibd_bio_set = bioset_create(32, 64);
if (!(ib_dev->ibd_bio_set)) {
printk(KERN_ERR "IBLOCK: Unable to create bioset()\n");
return ERR_PTR(-ENOMEM);
}
printk(KERN_INFO "IBLOCK: Created bio_set()\n");
/*
* iblock_check_configfs_dev_params() ensures that ib_dev->ibd_udev_path
* must already have been set in order for echo 1 > $HBA/$DEV/enable to run.
*/
printk(KERN_INFO "IBLOCK: Claiming struct block_device: %s\n",
ib_dev->ibd_udev_path);
bd = blkdev_get_by_path(ib_dev->ibd_udev_path,
FMODE_WRITE|FMODE_READ|FMODE_EXCL, ib_dev);
if (IS_ERR(bd)) {
ret = PTR_ERR(bd);
goto failed;
}
/*
* Setup the local scope queue_limits from struct request_queue->limits
* to pass into transport_add_device_to_core_hba() as struct se_dev_limits.
*/
q = bdev_get_queue(bd);
limits = &dev_limits.limits;
limits->logical_block_size = bdev_logical_block_size(bd);
limits->max_hw_sectors = queue_max_hw_sectors(q);
limits->max_sectors = queue_max_sectors(q);
dev_limits.hw_queue_depth = IBLOCK_MAX_DEVICE_QUEUE_DEPTH;
dev_limits.queue_depth = IBLOCK_DEVICE_QUEUE_DEPTH;
ib_dev->ibd_major = MAJOR(bd->bd_dev);
ib_dev->ibd_minor = MINOR(bd->bd_dev);
ib_dev->ibd_bd = bd;
dev = transport_add_device_to_core_hba(hba,
&iblock_template, se_dev, dev_flags, (void *)ib_dev,
&dev_limits, "IBLOCK", IBLOCK_VERSION);
if (!(dev))
goto failed;
ib_dev->ibd_depth = dev->queue_depth;
/*
* Check if the underlying struct block_device request_queue supports
* the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
* in ATA and we need to set TPE=1
*/
if (blk_queue_discard(q)) {
DEV_ATTRIB(dev)->max_unmap_lba_count =
q->limits.max_discard_sectors;
/*
* Currently hardcoded to 1 in Linux/SCSI code..
*/
DEV_ATTRIB(dev)->max_unmap_block_desc_count = 1;
DEV_ATTRIB(dev)->unmap_granularity =
q->limits.discard_granularity;
DEV_ATTRIB(dev)->unmap_granularity_alignment =
q->limits.discard_alignment;
printk(KERN_INFO "IBLOCK: BLOCK Discard support available,"
" disabled by default\n");
}
return dev;
failed:
if (ib_dev->ibd_bio_set) {
bioset_free(ib_dev->ibd_bio_set);
ib_dev->ibd_bio_set = NULL;
}
ib_dev->ibd_bd = NULL;
ib_dev->ibd_major = 0;
ib_dev->ibd_minor = 0;
return ERR_PTR(ret);
}
static void iblock_free_device(void *p)
{
struct iblock_dev *ib_dev = p;
if (ib_dev->ibd_bd != NULL)
blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
if (ib_dev->ibd_bio_set != NULL)
bioset_free(ib_dev->ibd_bio_set);
kfree(ib_dev);
}
static inline struct iblock_req *IBLOCK_REQ(struct se_task *task)
{
return container_of(task, struct iblock_req, ib_task);
}
static struct se_task *
iblock_alloc_task(struct se_cmd *cmd)
{
struct iblock_req *ib_req;
ib_req = kzalloc(sizeof(struct iblock_req), GFP_KERNEL);
if (!(ib_req)) {
printk(KERN_ERR "Unable to allocate memory for struct iblock_req\n");
return NULL;
}
ib_req->ib_dev = SE_DEV(cmd)->dev_ptr;
atomic_set(&ib_req->ib_bio_cnt, 0);
return &ib_req->ib_task;
}
static unsigned long long iblock_emulate_read_cap_with_block_size(
struct se_device *dev,
struct block_device *bd,
struct request_queue *q)
{
unsigned long long blocks_long = (div_u64(i_size_read(bd->bd_inode),
bdev_logical_block_size(bd)) - 1);
u32 block_size = bdev_logical_block_size(bd);
if (block_size == DEV_ATTRIB(dev)->block_size)
return blocks_long;
switch (block_size) {
case 4096:
switch (DEV_ATTRIB(dev)->block_size) {
case 2048:
blocks_long <<= 1;
break;
case 1024:
blocks_long <<= 2;
break;
case 512:
blocks_long <<= 3;
default:
break;
}
break;
case 2048:
switch (DEV_ATTRIB(dev)->block_size) {
case 4096:
blocks_long >>= 1;
break;
case 1024:
blocks_long <<= 1;
break;
case 512:
blocks_long <<= 2;
break;
default:
break;
}
break;
case 1024:
switch (DEV_ATTRIB(dev)->block_size) {
case 4096:
blocks_long >>= 2;
break;
case 2048:
blocks_long >>= 1;
break;
case 512:
blocks_long <<= 1;
break;
default:
break;
}
break;
case 512:
switch (DEV_ATTRIB(dev)->block_size) {
case 4096:
blocks_long >>= 3;
break;
case 2048:
blocks_long >>= 2;
break;
case 1024:
blocks_long >>= 1;
break;
default:
break;
}
break;
default:
break;
}
return blocks_long;
}
/*
* Emulate SYCHRONIZE_CACHE_*
*/
static void iblock_emulate_sync_cache(struct se_task *task)
{
struct se_cmd *cmd = TASK_CMD(task);
struct iblock_dev *ib_dev = cmd->se_dev->dev_ptr;
int immed = (T_TASK(cmd)->t_task_cdb[1] & 0x2);
sector_t error_sector;
int ret;
/*
* If the Immediate bit is set, queue up the GOOD response
* for this SYNCHRONIZE_CACHE op
*/
if (immed)
transport_complete_sync_cache(cmd, 1);
/*
* blkdev_issue_flush() does not support a specifying a range, so
* we have to flush the entire cache.
*/
ret = blkdev_issue_flush(ib_dev->ibd_bd, GFP_KERNEL, &error_sector);
if (ret != 0) {
printk(KERN_ERR "IBLOCK: block_issue_flush() failed: %d "
" error_sector: %llu\n", ret,
(unsigned long long)error_sector);
}
if (!immed)
transport_complete_sync_cache(cmd, ret == 0);
}
/*
* Tell TCM Core that we are capable of WriteCache emulation for
* an underlying struct se_device.
*/
static int iblock_emulated_write_cache(struct se_device *dev)
{
return 1;
}
static int iblock_emulated_dpo(struct se_device *dev)
{
return 0;
}
/*
* Tell TCM Core that we will be emulating Forced Unit Access (FUA) for WRITEs
* for TYPE_DISK.
*/
static int iblock_emulated_fua_write(struct se_device *dev)
{
return 1;
}
static int iblock_emulated_fua_read(struct se_device *dev)
{
return 0;
}
static int iblock_do_task(struct se_task *task)
{
struct se_device *dev = task->task_se_cmd->se_dev;
struct iblock_req *req = IBLOCK_REQ(task);
struct bio *bio = req->ib_bio, *nbio = NULL;
struct blk_plug plug;
int rw;
if (task->task_data_direction == DMA_TO_DEVICE) {
/*
* Force data to disk if we pretend to not have a volatile
* write cache, or the initiator set the Force Unit Access bit.
*/
if (DEV_ATTRIB(dev)->emulate_write_cache == 0 ||
(DEV_ATTRIB(dev)->emulate_fua_write > 0 &&
T_TASK(task->task_se_cmd)->t_tasks_fua))
rw = WRITE_FUA;
else
rw = WRITE;
} else {
rw = READ;
}
blk_start_plug(&plug);
while (bio) {
nbio = bio->bi_next;
bio->bi_next = NULL;
DEBUG_IBLOCK("Calling submit_bio() task: %p bio: %p"
" bio->bi_sector: %llu\n", task, bio, bio->bi_sector);
submit_bio(rw, bio);
bio = nbio;
}
blk_finish_plug(&plug);
return PYX_TRANSPORT_SENT_TO_TRANSPORT;
}
static int iblock_do_discard(struct se_device *dev, sector_t lba, u32 range)
{
struct iblock_dev *ibd = dev->dev_ptr;
struct block_device *bd = ibd->ibd_bd;
int barrier = 0;
return blkdev_issue_discard(bd, lba, range, GFP_KERNEL, barrier);
}
static void iblock_free_task(struct se_task *task)
{
struct iblock_req *req = IBLOCK_REQ(task);
struct bio *bio, *hbio = req->ib_bio;
/*
* We only release the bio(s) here if iblock_bio_done() has not called
* bio_put() -> iblock_bio_destructor().
*/
while (hbio != NULL) {
bio = hbio;
hbio = hbio->bi_next;
bio->bi_next = NULL;
bio_put(bio);
}
kfree(req);
}
enum {
Opt_udev_path, Opt_force, Opt_err
};
static match_table_t tokens = {
{Opt_udev_path, "udev_path=%s"},
{Opt_force, "force=%d"},
{Opt_err, NULL}
};
static ssize_t iblock_set_configfs_dev_params(struct se_hba *hba,
struct se_subsystem_dev *se_dev,
const char *page, ssize_t count)
{
struct iblock_dev *ib_dev = se_dev->se_dev_su_ptr;
char *orig, *ptr, *arg_p, *opts;
substring_t args[MAX_OPT_ARGS];
int ret = 0, arg, token;
opts = kstrdup(page, GFP_KERNEL);
if (!opts)
return -ENOMEM;
orig = opts;
while ((ptr = strsep(&opts, ",")) != NULL) {
if (!*ptr)
continue;
token = match_token(ptr, tokens, args);
switch (token) {
case Opt_udev_path:
if (ib_dev->ibd_bd) {
printk(KERN_ERR "Unable to set udev_path= while"
" ib_dev->ibd_bd exists\n");
ret = -EEXIST;
goto out;
}
arg_p = match_strdup(&args[0]);
if (!arg_p) {
ret = -ENOMEM;
break;
}
snprintf(ib_dev->ibd_udev_path, SE_UDEV_PATH_LEN,
"%s", arg_p);
kfree(arg_p);
printk(KERN_INFO "IBLOCK: Referencing UDEV path: %s\n",
ib_dev->ibd_udev_path);
ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH;
break;
case Opt_force:
match_int(args, &arg);
ib_dev->ibd_force = arg;
printk(KERN_INFO "IBLOCK: Set force=%d\n",
ib_dev->ibd_force);
break;
default:
break;
}
}
out:
kfree(orig);
return (!ret) ? count : ret;
}
static ssize_t iblock_check_configfs_dev_params(
struct se_hba *hba,
struct se_subsystem_dev *se_dev)
{
struct iblock_dev *ibd = se_dev->se_dev_su_ptr;
if (!(ibd->ibd_flags & IBDF_HAS_UDEV_PATH)) {
printk(KERN_ERR "Missing udev_path= parameters for IBLOCK\n");
return -1;
}
return 0;
}
static ssize_t iblock_show_configfs_dev_params(
struct se_hba *hba,
struct se_subsystem_dev *se_dev,
char *b)
{
struct iblock_dev *ibd = se_dev->se_dev_su_ptr;
struct block_device *bd = ibd->ibd_bd;
char buf[BDEVNAME_SIZE];
ssize_t bl = 0;
if (bd)
bl += sprintf(b + bl, "iBlock device: %s",
bdevname(bd, buf));
if (ibd->ibd_flags & IBDF_HAS_UDEV_PATH) {
bl += sprintf(b + bl, " UDEV PATH: %s\n",
ibd->ibd_udev_path);
} else
bl += sprintf(b + bl, "\n");
bl += sprintf(b + bl, " ");
if (bd) {
bl += sprintf(b + bl, "Major: %d Minor: %d %s\n",
ibd->ibd_major, ibd->ibd_minor, (!bd->bd_contains) ?
"" : (bd->bd_holder == (struct iblock_dev *)ibd) ?
"CLAIMED: IBLOCK" : "CLAIMED: OS");
} else {
bl += sprintf(b + bl, "Major: %d Minor: %d\n",
ibd->ibd_major, ibd->ibd_minor);
}
return bl;
}
static void iblock_bio_destructor(struct bio *bio)
{
struct se_task *task = bio->bi_private;
struct iblock_dev *ib_dev = task->se_dev->dev_ptr;
bio_free(bio, ib_dev->ibd_bio_set);
}
static struct bio *iblock_get_bio(
struct se_task *task,
struct iblock_req *ib_req,
struct iblock_dev *ib_dev,
int *ret,
sector_t lba,
u32 sg_num)
{
struct bio *bio;
bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set);
if (!(bio)) {
printk(KERN_ERR "Unable to allocate memory for bio\n");
*ret = PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
return NULL;
}
DEBUG_IBLOCK("Allocated bio: %p task_sg_num: %u using ibd_bio_set:"
" %p\n", bio, task->task_sg_num, ib_dev->ibd_bio_set);
DEBUG_IBLOCK("Allocated bio: %p task_size: %u\n", bio, task->task_size);
bio->bi_bdev = ib_dev->ibd_bd;
bio->bi_private = (void *) task;
bio->bi_destructor = iblock_bio_destructor;
bio->bi_end_io = &iblock_bio_done;
bio->bi_sector = lba;
atomic_inc(&ib_req->ib_bio_cnt);
DEBUG_IBLOCK("Set bio->bi_sector: %llu\n", bio->bi_sector);
DEBUG_IBLOCK("Set ib_req->ib_bio_cnt: %d\n",
atomic_read(&ib_req->ib_bio_cnt));
return bio;
}
static int iblock_map_task_SG(struct se_task *task)
{
struct se_cmd *cmd = task->task_se_cmd;
struct se_device *dev = SE_DEV(cmd);
struct iblock_dev *ib_dev = task->se_dev->dev_ptr;
struct iblock_req *ib_req = IBLOCK_REQ(task);
struct bio *bio = NULL, *hbio = NULL, *tbio = NULL;
struct scatterlist *sg;
int ret = 0;
u32 i, sg_num = task->task_sg_num;
sector_t block_lba;
/*
* Do starting conversion up from non 512-byte blocksize with
* struct se_task SCSI blocksize into Linux/Block 512 units for BIO.
*/
if (DEV_ATTRIB(dev)->block_size == 4096)
block_lba = (task->task_lba << 3);
else if (DEV_ATTRIB(dev)->block_size == 2048)
block_lba = (task->task_lba << 2);
else if (DEV_ATTRIB(dev)->block_size == 1024)
block_lba = (task->task_lba << 1);
else if (DEV_ATTRIB(dev)->block_size == 512)
block_lba = task->task_lba;
else {
printk(KERN_ERR "Unsupported SCSI -> BLOCK LBA conversion:"
" %u\n", DEV_ATTRIB(dev)->block_size);
return PYX_TRANSPORT_LU_COMM_FAILURE;
}
bio = iblock_get_bio(task, ib_req, ib_dev, &ret, block_lba, sg_num);
if (!(bio))
return ret;
ib_req->ib_bio = bio;
hbio = tbio = bio;
/*
* Use fs/bio.c:bio_add_pages() to setup the bio_vec maplist
* from TCM struct se_mem -> task->task_sg -> struct scatterlist memory.
*/
for_each_sg(task->task_sg, sg, task->task_sg_num, i) {
DEBUG_IBLOCK("task: %p bio: %p Calling bio_add_page(): page:"
" %p len: %u offset: %u\n", task, bio, sg_page(sg),
sg->length, sg->offset);
again:
ret = bio_add_page(bio, sg_page(sg), sg->length, sg->offset);
if (ret != sg->length) {
DEBUG_IBLOCK("*** Set bio->bi_sector: %llu\n",
bio->bi_sector);
DEBUG_IBLOCK("** task->task_size: %u\n",
task->task_size);
DEBUG_IBLOCK("*** bio->bi_max_vecs: %u\n",
bio->bi_max_vecs);
DEBUG_IBLOCK("*** bio->bi_vcnt: %u\n",
bio->bi_vcnt);
bio = iblock_get_bio(task, ib_req, ib_dev, &ret,
block_lba, sg_num);
if (!(bio))
goto fail;
tbio = tbio->bi_next = bio;
DEBUG_IBLOCK("-----------------> Added +1 bio: %p to"
" list, Going to again\n", bio);
goto again;
}
/* Always in 512 byte units for Linux/Block */
block_lba += sg->length >> IBLOCK_LBA_SHIFT;
sg_num--;
DEBUG_IBLOCK("task: %p bio-add_page() passed!, decremented"
" sg_num to %u\n", task, sg_num);
DEBUG_IBLOCK("task: %p bio_add_page() passed!, increased lba"
" to %llu\n", task, block_lba);
DEBUG_IBLOCK("task: %p bio_add_page() passed!, bio->bi_vcnt:"
" %u\n", task, bio->bi_vcnt);
}
return 0;
fail:
while (hbio) {
bio = hbio;
hbio = hbio->bi_next;
bio->bi_next = NULL;
bio_put(bio);
}
return ret;
}
static unsigned char *iblock_get_cdb(struct se_task *task)
{
return IBLOCK_REQ(task)->ib_scsi_cdb;
}
static u32 iblock_get_device_rev(struct se_device *dev)
{
return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */
}
static u32 iblock_get_device_type(struct se_device *dev)
{
return TYPE_DISK;
}
static sector_t iblock_get_blocks(struct se_device *dev)
{
struct iblock_dev *ibd = dev->dev_ptr;
struct block_device *bd = ibd->ibd_bd;
struct request_queue *q = bdev_get_queue(bd);
return iblock_emulate_read_cap_with_block_size(dev, bd, q);
}
static void iblock_bio_done(struct bio *bio, int err)
{
struct se_task *task = bio->bi_private;
struct iblock_req *ibr = IBLOCK_REQ(task);
/*
* Set -EIO if !BIO_UPTODATE and the passed is still err=0
*/
if (!(test_bit(BIO_UPTODATE, &bio->bi_flags)) && !(err))
err = -EIO;
if (err != 0) {
printk(KERN_ERR "test_bit(BIO_UPTODATE) failed for bio: %p,"
" err: %d\n", bio, err);
/*
* Bump the ib_bio_err_cnt and release bio.
*/
atomic_inc(&ibr->ib_bio_err_cnt);
smp_mb__after_atomic_inc();
bio_put(bio);
/*
* Wait to complete the task until the last bio as completed.
*/
if (!(atomic_dec_and_test(&ibr->ib_bio_cnt)))
return;
ibr->ib_bio = NULL;
transport_complete_task(task, 0);
return;
}
DEBUG_IBLOCK("done[%p] bio: %p task_lba: %llu bio_lba: %llu err=%d\n",
task, bio, task->task_lba, bio->bi_sector, err);
/*
* bio_put() will call iblock_bio_destructor() to release the bio back
* to ibr->ib_bio_set.
*/
bio_put(bio);
/*
* Wait to complete the task until the last bio as completed.
*/
if (!(atomic_dec_and_test(&ibr->ib_bio_cnt)))
return;
/*
* Return GOOD status for task if zero ib_bio_err_cnt exists.
*/
ibr->ib_bio = NULL;
transport_complete_task(task, (!atomic_read(&ibr->ib_bio_err_cnt)));
}
static struct se_subsystem_api iblock_template = {
.name = "iblock",
.owner = THIS_MODULE,
.transport_type = TRANSPORT_PLUGIN_VHBA_PDEV,
.map_task_SG = iblock_map_task_SG,
.attach_hba = iblock_attach_hba,
.detach_hba = iblock_detach_hba,
.allocate_virtdevice = iblock_allocate_virtdevice,
.create_virtdevice = iblock_create_virtdevice,
.free_device = iblock_free_device,
.dpo_emulated = iblock_emulated_dpo,
.fua_write_emulated = iblock_emulated_fua_write,
.fua_read_emulated = iblock_emulated_fua_read,
.write_cache_emulated = iblock_emulated_write_cache,
.alloc_task = iblock_alloc_task,
.do_task = iblock_do_task,
.do_discard = iblock_do_discard,
.do_sync_cache = iblock_emulate_sync_cache,
.free_task = iblock_free_task,
.check_configfs_dev_params = iblock_check_configfs_dev_params,
.set_configfs_dev_params = iblock_set_configfs_dev_params,
.show_configfs_dev_params = iblock_show_configfs_dev_params,
.get_cdb = iblock_get_cdb,
.get_device_rev = iblock_get_device_rev,
.get_device_type = iblock_get_device_type,
.get_blocks = iblock_get_blocks,
};
static int __init iblock_module_init(void)
{
return transport_subsystem_register(&iblock_template);
}
static void iblock_module_exit(void)
{
transport_subsystem_release(&iblock_template);
}
MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin");
MODULE_AUTHOR("nab@Linux-iSCSI.org");
MODULE_LICENSE("GPL");
module_init(iblock_module_init);
module_exit(iblock_module_exit);