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Message-Id: <1253311697.4498.149.camel@haakon2.linux-iscsi.org>
Date: Fri, 18 Sep 2009 15:08:17 -0700
From: "Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To: LKML <linux-kernel@...r.kernel.org>,
linux-scsi <linux-scsi@...r.kernel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Greg KH <greg@...ah.com>,
Douglas Gilbert <dgilbert@...erlog.com>,
James Bottomley <James.Bottomley@...senPartnership.com>,
Hannes Reinecke <hare@...e.de>,
FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
Mike Christie <michaelc@...wisc.edu>,
Joel Becker <joel.becker@...cle.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Christoph Hellwig <hch@....de>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Alan Stern <stern@...land.harvard.edu>,
Boaz Harrosh <bharrosh@...asas.com>,
Florian Haas <florian.haas@...bit.com>,
Philipp Reisner <philipp.reisner@...bit.com>,
Lars Ellenberg <lars.ellenberg@...bit.com>,
Daniel Walker <dwalker@...o99.com>
Subject: [RFC PATCH 6/19] Target_Core_Mod IBLOCK <-> Linux/Block subsystem
plugin
[RFC PATCH 6/19] Target_Core_Mod IBLOCK <-> Linux/Block subsystem plugin
This patch adds the iBLOCK subsystem plugin for accessing struct block_device
with an emulated SPC-3 control path from upstream Linux/BLOCK code.
Signed-off-by: Nicholas A. Bellinger <nab@...ux-iscsi.org>
diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c
new file mode 100644
index 0000000..1517733
--- /dev/null
+++ b/drivers/target/target_core_iblock.c
@@ -0,0 +1,1058 @@
+/*******************************************************************************
+ * 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) 2007-2009 Rising Tide Software, Inc.
+ * Copyright (c) 2008-2009 Linux-iSCSI.org
+ *
+ * Nicholas A. Bellinger <nab@...nel.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.
+ *
+ ******************************************************************************/
+
+#define TARGET_CORE_IBLOCK_C
+#include <linux/version.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/fs.h>
+#include <linux/blkdev.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/smp_lock.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/target_core_iblock.h>
+
+#undef TARGET_CORE_IBLOCK_C
+
+#if 0
+#define DEBUG_IBLOCK(x...) printk(x)
+#else
+#define DEBUG_IBLOCK(x...)
+#endif
+
+/* iblock_attach_hba(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+int iblock_attach_hba(se_hba_t *hba, u32 host_id)
+{
+ iblock_hba_t *ib_host;
+
+ ib_host = kzalloc(sizeof(iblock_hba_t), GFP_KERNEL);
+ if (!(ib_host)) {
+ printk(KERN_ERR "Unable to allocate memory for iblock_hba_t\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;
+ hba->transport = &iblock_template;
+
+ 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;
+}
+
+/* iblock_detach_hba(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+int iblock_detach_hba(se_hba_t *hba)
+{
+ iblock_hba_t *ib_host;
+
+ if (!hba->hba_ptr) {
+ printk(KERN_ERR "hba->hba_ptr is NULL!\n");
+ return -1;
+ }
+ ib_host = (iblock_hba_t *) 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;
+
+ return 0;
+}
+
+int iblock_claim_phydevice(se_hba_t *hba, se_device_t *dev)
+{
+ iblock_dev_t *ib_dev = (iblock_dev_t *)dev->dev_ptr;
+ struct block_device *bd;
+
+ if (dev->dev_flags & DF_READ_ONLY) {
+ printk(KERN_INFO "IBLOCK: Using previously claimed %p Major:"
+ "Minor" " - %d:%d\n", ib_dev->ibd_bd, ib_dev->ibd_major,
+ ib_dev->ibd_minor);
+ } else {
+ printk(KERN_INFO "IBLOCK: Claiming %p Major:Minor - %d:%d\n",
+ ib_dev, ib_dev->ibd_major, ib_dev->ibd_minor);
+
+ bd = linux_blockdevice_claim(ib_dev->ibd_major,
+ ib_dev->ibd_minor, (void *)ib_dev);
+ if (!(bd))
+ return -1;
+
+ ib_dev->ibd_bd = bd;
+ ib_dev->ibd_bd->bd_contains = bd;
+ }
+
+ return 0;
+}
+
+static int __iblock_release_phydevice(iblock_dev_t *ib_dev, int ro)
+{
+ if (!ib_dev->ibd_bd)
+ return 0;
+
+ if (ro == 1) {
+ printk(KERN_INFO "IBLOCK: Calling blkdev_put() for Major:Minor"
+ " - %d:%d\n", ib_dev->ibd_major, ib_dev->ibd_minor);
+ blkdev_put((struct block_device *)ib_dev->ibd_bd, FMODE_READ);
+ } else {
+ printk(KERN_INFO "IBLOCK: Releasing Major:Minor - %d:%d\n",
+ ib_dev->ibd_major, ib_dev->ibd_minor);
+ linux_blockdevice_release(ib_dev->ibd_major, ib_dev->ibd_minor,
+ (struct block_device *)ib_dev->ibd_bd);
+ }
+
+ ib_dev->ibd_bd = NULL;
+
+ return 0;
+}
+
+int iblock_release_phydevice(se_device_t *dev)
+{
+ iblock_dev_t *ib_dev = (iblock_dev_t *)dev->dev_ptr;
+
+ if (!ib_dev->ibd_bd)
+ return 0;
+
+ return __iblock_release_phydevice(ib_dev,
+ (dev->dev_flags & DF_READ_ONLY) ? 1 : 0);
+}
+
+void *iblock_allocate_virtdevice(se_hba_t *hba, const char *name)
+{
+ iblock_dev_t *ib_dev = NULL;
+ iblock_hba_t *ib_host = (iblock_hba_t *) hba->hba_ptr;
+
+ ib_dev = kzalloc(sizeof(iblock_dev_t), GFP_KERNEL);
+ if (!(ib_dev)) {
+ printk(KERN_ERR "Unable to allocate iblock_dev_t\n");
+ return NULL;
+ }
+ ib_dev->ibd_host = ib_host;
+
+ printk(KERN_INFO "IBLOCK: Allocated ib_dev for %s\n", name);
+
+ return ib_dev;
+}
+
+se_device_t *iblock_create_virtdevice(
+ se_hba_t *hba,
+ se_subsystem_dev_t *se_dev,
+ void *p)
+{
+ iblock_dev_t *ib_dev = (iblock_dev_t *) p;
+ se_device_t *dev;
+ struct block_device *bd = NULL;
+ u32 dev_flags = 0;
+ int ret = 0;
+
+ if (!(ib_dev)) {
+ printk(KERN_ERR "Unable to locate iblock_dev_t parameter\n");
+ return 0;
+ }
+ /*
+ * Check if we have an open file descritpor passed through configfs
+ * $TARGET/iblock_0/some_bd/fd pointing to an underlying.
+ * struct block_device. If so, claim it with the pointer from
+ * iblock_create_virtdevice_from_fd()
+ *
+ * Otherwise, assume that parameters through 'control' attribute
+ * have set ib_dev->ibd_[major,minor]
+ */
+ if (ib_dev->ibd_bd) {
+ printk(KERN_INFO "IBLOCK: Claiming struct block_device: %p\n",
+ ib_dev->ibd_bd);
+
+ bd = linux_blockdevice_claim(ib_dev->ibd_bd->bd_disk->major,
+ ib_dev->ibd_bd->bd_disk->first_minor,
+ ib_dev);
+ if (!(bd)) {
+ printk(KERN_INFO "IBLOCK: Unable to claim"
+ " struct block_device\n");
+ goto failed;
+ }
+ dev_flags = DF_CLAIMED_BLOCKDEV;
+ ib_dev->ibd_major = bd->bd_disk->major;
+ ib_dev->ibd_minor = bd->bd_disk->first_minor;
+ } else {
+ printk(KERN_INFO "IBLOCK: Claiming %p Major:Minor - %d:%d\n",
+ ib_dev, ib_dev->ibd_major, ib_dev->ibd_minor);
+
+ bd = __linux_blockdevice_claim(ib_dev->ibd_major,
+ ib_dev->ibd_minor, ib_dev, &ret);
+ if ((bd)) {
+ if (ret == 1)
+ dev_flags = DF_CLAIMED_BLOCKDEV;
+ else if (ib_dev->ibd_force) {
+ dev_flags = DF_READ_ONLY;
+ printk(KERN_INFO "IBLOCK: DF_READ_ONLY for"
+ " Major:Minor - %d:%d\n",
+ ib_dev->ibd_major, ib_dev->ibd_minor);
+ } else {
+ printk(KERN_INFO "WARNING: Unable to claim"
+ " block device. Only use force=1 for"
+ " READ-ONLY access.\n");
+ goto failed;
+ }
+ ib_dev->ibd_bd = bd;
+ } else
+ goto failed;
+ }
+ if (dev_flags & DF_CLAIMED_BLOCKDEV)
+ ib_dev->ibd_bd->bd_contains = bd;
+ /*
+ * 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");
+ __iblock_release_phydevice(ib_dev,
+ (dev_flags == DF_READ_ONLY ? 1 : 0));
+ goto failed;
+ }
+ printk(KERN_INFO "IBLOCK: Created bio_set() for major/minor: %d:%d\n",
+ ib_dev->ibd_major, ib_dev->ibd_minor);
+ /*
+ * Pass dev_flags for linux_blockdevice_claim() or
+ * linux_blockdevice_claim() from the usage above.
+ *
+ * Note that transport_add_device_to_core_hba() will call
+ * linux_blockdevice_release() internally on failure to
+ * call bd_release() on the referenced struct block_device.
+ */
+ dev = transport_add_device_to_core_hba(hba,
+ &iblock_template, se_dev, dev_flags, (void *)ib_dev);
+ if (!(dev))
+ goto failed;
+
+ ib_dev->ibd_depth = dev->queue_depth;
+
+ 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;
+ return NULL;
+}
+
+/* iblock_activate_device(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+int iblock_activate_device(se_device_t *dev)
+{
+ iblock_dev_t *ib_dev = (iblock_dev_t *) dev->dev_ptr;
+ iblock_hba_t *ib_hba = ib_dev->ibd_host;
+
+ printk(KERN_INFO "CORE_iBLOCK[%u] - Activating Device with TCQ: %d at"
+ " Major: %d Minor %d\n", ib_hba->iblock_host_id,
+ ib_dev->ibd_depth, ib_dev->ibd_major, ib_dev->ibd_minor);
+
+ return 0;
+}
+
+/* iblock_deactivate_device(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+void iblock_deactivate_device(se_device_t *dev)
+{
+ iblock_dev_t *ib_dev = (iblock_dev_t *) dev->dev_ptr;
+ iblock_hba_t *ib_hba = ib_dev->ibd_host;
+
+ printk(KERN_INFO "CORE_iBLOCK[%u] - Deactivating Device with TCQ: %d"
+ " at Major: %d Minor %d\n", ib_hba->iblock_host_id,
+ ib_dev->ibd_depth, ib_dev->ibd_major, ib_dev->ibd_minor);
+}
+
+void iblock_free_device(void *p)
+{
+ iblock_dev_t *ib_dev = (iblock_dev_t *) p;
+
+ if (ib_dev->ibd_bio_set) {
+ DEBUG_IBLOCK("Calling bioset_free ib_dev->ibd_bio_set: %p\n",
+ ib_dev->ibd_bio_set);
+ bioset_free(ib_dev->ibd_bio_set);
+ }
+
+ kfree(ib_dev);
+}
+
+int iblock_transport_complete(se_task_t *task)
+{
+ return 0;
+}
+
+/* iblock_allocate_request(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+void *iblock_allocate_request(
+ se_task_t *task,
+ se_device_t *dev)
+{
+ iblock_req_t *ib_req;
+
+ ib_req = kmalloc(sizeof(iblock_req_t), GFP_KERNEL);
+ if (!(ib_req)) {
+ printk(KERN_ERR "Unable to allocate memory for iblock_req_t\n");
+ return NULL;
+ }
+
+ ib_req->ib_dev = (iblock_dev_t *) dev->dev_ptr;
+ return (void *)ib_req;
+}
+
+static int iblock_emulate_inquiry(se_task_t *task)
+{
+ unsigned char prod[64], se_location[128];
+ se_cmd_t *cmd = TASK_CMD(task);
+ iblock_dev_t *ibd = (iblock_dev_t *) task->se_dev->dev_ptr;
+ se_hba_t *hba = task->se_dev->se_hba;
+
+ memset(prod, 0, 64);
+ memset(se_location, 0, 128);
+
+ sprintf(prod, "IBLOCK");
+ sprintf(se_location, "%u_%u_%u", hba->hba_id, ibd->ibd_major,
+ ibd->ibd_minor);
+
+ return transport_generic_emulate_inquiry(cmd, TYPE_DISK, prod,
+ IBLOCK_VERSION, se_location);
+}
+
+static unsigned long long iblock_emulate_read_cap_with_block_size(
+ se_device_t *dev,
+ struct block_device *bd,
+ struct request_queue *q)
+{
+ unsigned long long blocks_long = (get_capacity(bd->bd_disk) - 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;
+}
+
+static int iblock_emulate_read_cap(se_task_t *task)
+{
+ iblock_dev_t *ibd = (iblock_dev_t *) task->se_dev->dev_ptr;
+ struct block_device *bd = ibd->ibd_bd;
+ struct request_queue *q = bdev_get_queue(bd);
+ unsigned long long blocks_long = 0;
+ u32 blocks = 0;
+
+ blocks_long = iblock_emulate_read_cap_with_block_size(
+ task->se_dev, bd, q);
+ if (blocks_long >= 0x00000000ffffffff)
+ blocks = 0xffffffff;
+ else
+ blocks = (u32)blocks_long;
+
+ return transport_generic_emulate_readcapacity(TASK_CMD(task), blocks);
+}
+
+static int iblock_emulate_read_cap16(se_task_t *task)
+{
+ iblock_dev_t *ibd = (iblock_dev_t *) task->se_dev->dev_ptr;
+ struct block_device *bd = ibd->ibd_bd;
+ struct request_queue *q = bdev_get_queue(bd);
+ unsigned long long blocks_long;
+
+ blocks_long = iblock_emulate_read_cap_with_block_size(
+ task->se_dev, bd, q);
+ return transport_generic_emulate_readcapacity_16(
+ TASK_CMD(task), blocks_long);
+}
+
+static int iblock_emulate_scsi_cdb(se_task_t *task)
+{
+ int ret;
+ se_cmd_t *cmd = TASK_CMD(task);
+
+ switch (T_TASK(cmd)->t_task_cdb[0]) {
+ case INQUIRY:
+ if (iblock_emulate_inquiry(task) < 0)
+ return PYX_TRANSPORT_INVALID_CDB_FIELD;
+ break;
+ case READ_CAPACITY:
+ ret = iblock_emulate_read_cap(task);
+ if (ret < 0)
+ return ret;
+ break;
+ case MODE_SENSE:
+ ret = transport_generic_emulate_modesense(TASK_CMD(task),
+ T_TASK(cmd)->t_task_cdb,
+ T_TASK(cmd)->t_task_buf, 0, TYPE_DISK);
+ if (ret < 0)
+ return ret;
+ break;
+ case MODE_SENSE_10:
+ ret = transport_generic_emulate_modesense(TASK_CMD(task),
+ T_TASK(cmd)->t_task_cdb,
+ T_TASK(cmd)->t_task_buf, 1, TYPE_DISK);
+ if (ret < 0)
+ return ret;
+ break;
+ case SERVICE_ACTION_IN:
+ if ((T_TASK(cmd)->t_task_cdb[1] & 0x1f) !=
+ SAI_READ_CAPACITY_16) {
+ printk(KERN_ERR "Unsupported SA: 0x%02x\n",
+ T_TASK(cmd)->t_task_cdb[1] & 0x1f);
+ return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
+ }
+ ret = iblock_emulate_read_cap16(task);
+ if (ret < 0)
+ return ret;
+ break;
+ case REQUEST_SENSE:
+ ret = transport_generic_emulate_request_sense(cmd,
+ T_TASK(cmd)->t_task_cdb);
+ if (ret < 0)
+ return ret;
+ break;
+ case ALLOW_MEDIUM_REMOVAL:
+ case ERASE:
+ case REZERO_UNIT:
+ case SEEK_10:
+ case SPACE:
+ case START_STOP:
+ case SYNCHRONIZE_CACHE:
+ case TEST_UNIT_READY:
+ case VERIFY:
+ case WRITE_FILEMARKS:
+ case RESERVE:
+ case RESERVE_10:
+ case RELEASE:
+ case RELEASE_10:
+ break;
+ default:
+ printk(KERN_ERR "Unsupported SCSI Opcode: 0x%02x for iBlock\n",
+ T_TASK(cmd)->t_task_cdb[0]);
+ return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
+ }
+
+ task->task_scsi_status = GOOD;
+ transport_complete_task(task, 1);
+
+ return PYX_TRANSPORT_SENT_TO_TRANSPORT;
+}
+
+int iblock_do_task(se_task_t *task)
+{
+ iblock_req_t *req = (iblock_req_t *)task->transport_req;
+ iblock_dev_t *ibd = (iblock_dev_t *)req->ib_dev;
+ struct request_queue *q = bdev_get_queue(ibd->ibd_bd);
+ struct bio *bio = req->ib_bio, *nbio = NULL;
+
+ if (!(TASK_CMD(task)->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB))
+ return iblock_emulate_scsi_cdb(task);
+
+ 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(
+ (TASK_CMD(task)->data_direction == SE_DIRECTION_WRITE),
+ bio);
+
+ bio = nbio;
+ }
+
+ if (q->unplug_fn)
+ q->unplug_fn(q);
+
+ return PYX_TRANSPORT_SENT_TO_TRANSPORT;
+}
+
+void iblock_free_task(se_task_t *task)
+{
+ iblock_req_t *req = (iblock_req_t *) task->transport_req;
+
+ /*
+ * We do not release the bio(s) here associated with this task, as
+ * this is handled by bio_put() and iblock_bio_destructor().
+ */
+
+ kfree(req);
+ task->transport_req = NULL;
+}
+
+ssize_t iblock_set_configfs_dev_params(se_hba_t *hba,
+ se_subsystem_dev_t *se_dev,
+ const char *page, ssize_t count)
+{
+ iblock_dev_t *ib_dev = (iblock_dev_t *) se_dev->se_dev_su_ptr;
+ char *buf, *cur, *ptr, *ptr2;
+ unsigned long major, minor, force;
+ int params = 0, ret = 0;
+
+ buf = kzalloc(count, GFP_KERNEL);
+ if (!(buf)) {
+ printk(KERN_ERR "Unable to allocate memory for temporary"
+ " buffer\n");
+ return 0;
+ }
+ memcpy(buf, page, count);
+ cur = buf;
+
+ while (cur) {
+ ptr = strstr(cur, "=");
+ if (!(ptr))
+ goto out;
+
+ *ptr = '\0';
+ ptr++;
+
+ ptr2 = strstr(cur, "udev_path");
+ if ((ptr2)) {
+ transport_check_dev_params_delim(ptr, &cur);
+ ptr = strstrip(ptr);
+ ret = snprintf(ib_dev->ibd_udev_path, SE_UDEV_PATH_LEN,
+ "%s", ptr);
+ printk(KERN_INFO "IBLOCK: Referencing UDEV path: %s\n",
+ ib_dev->ibd_udev_path);
+ ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH;
+ params++;
+ continue;
+ }
+ ptr2 = strstr(cur, "major");
+ if ((ptr2)) {
+ transport_check_dev_params_delim(ptr, &cur);
+ ret = strict_strtoul(ptr, 0, &major);
+ if (ret < 0) {
+ printk(KERN_ERR "strict_strtoul() failed"
+ " for major=\n");
+ break;
+ }
+ ib_dev->ibd_major = (int)major;
+ printk(KERN_INFO "IBLOCK: Referencing Major: %d\n",
+ ib_dev->ibd_major);
+ ib_dev->ibd_flags |= IBDF_HAS_MAJOR;
+ params++;
+ continue;
+ }
+ ptr2 = strstr(cur, "minor");
+ if ((ptr2)) {
+ transport_check_dev_params_delim(ptr, &cur);
+ ret = strict_strtoul(ptr, 0, &minor);
+ if (ret < 0) {
+ printk(KERN_ERR "strict_strtoul() failed"
+ " for minor=\n");
+ break;
+ }
+ ib_dev->ibd_minor = (int)minor;
+ printk(KERN_INFO "IBLOCK: Referencing Minor: %d\n",
+ ib_dev->ibd_minor);
+ ib_dev->ibd_flags |= IBDF_HAS_MINOR;
+ params++;
+ continue;
+ }
+ ptr2 = strstr(cur, "force");
+ if ((ptr2)) {
+ transport_check_dev_params_delim(ptr, &cur);
+ ret = strict_strtoul(ptr, 0, &force);
+ if (ret < 0) {
+ printk(KERN_ERR "strict_strtoul() failed"
+ " for force=\n");
+ break;
+ }
+ ib_dev->ibd_force = (int)force;
+ printk(KERN_INFO "IBLOCK: Set force=%d\n",
+ ib_dev->ibd_force);
+ params++;
+ } else
+ cur = NULL;
+ }
+
+out:
+ kfree(buf);
+ return (params) ? count : -EINVAL;
+}
+
+ssize_t iblock_check_configfs_dev_params(
+ se_hba_t *hba,
+ se_subsystem_dev_t *se_dev)
+{
+ iblock_dev_t *ibd = (iblock_dev_t *) se_dev->se_dev_su_ptr;
+
+ if (!(ibd->ibd_flags & IBDF_HAS_MAJOR) ||
+ !(ibd->ibd_flags & IBDF_HAS_MINOR)) {
+ printk(KERN_ERR "Missing iblock_major= and iblock_minor="
+ " parameters\n");
+ return -1;
+ }
+
+ return 0;
+}
+
+ssize_t iblock_show_configfs_dev_params(
+ se_hba_t *hba,
+ se_subsystem_dev_t *se_dev,
+ char *page)
+{
+ iblock_dev_t *ibd = (iblock_dev_t *) se_dev->se_dev_su_ptr;
+ int bl = 0;
+
+ __iblock_get_dev_info(ibd, page, &bl);
+ return (ssize_t)bl;
+}
+
+se_device_t *iblock_create_virtdevice_from_fd(
+ se_subsystem_dev_t *se_dev,
+ const char *page)
+{
+ iblock_dev_t *ibd = (iblock_dev_t *) se_dev->se_dev_su_ptr;
+ se_device_t *dev = NULL;
+ struct file *filp;
+ struct inode *inode;
+ char *p = (char *)page;
+ unsigned long long fd;
+ int ret;
+
+ ret = strict_strtoull(p, 0, (unsigned long long *)&fd);
+ if (ret < 0) {
+ printk(KERN_ERR "strict_strtol() failed for fd\n");
+ return ERR_PTR(-EINVAL);
+ }
+ if ((fd < 3 || fd > 7)) {
+ printk(KERN_ERR "IBLOCK: Illegal value of file descriptor:"
+ " %llu\n", fd);
+ return ERR_PTR(-EINVAL);
+ }
+ filp = fget(fd);
+ if (!(filp)) {
+ printk(KERN_ERR "IBLOCK: Unable to fget() fd: %llu\n", fd);
+ return ERR_PTR(-EBADF);
+ }
+ inode = igrab(filp->f_mapping->host);
+ if (!(inode)) {
+ printk(KERN_ERR "IBLOCK: Unable to locate struct inode for"
+ " struct block_device fd\n");
+ fput(filp);
+ return ERR_PTR(-EINVAL);
+ }
+ if (!(S_ISBLK(inode->i_mode))) {
+ printk(KERN_ERR "IBLOCK: S_ISBLK(inode->i_mode) failed for file"
+ " descriptor: %llu\n", fd);
+ iput(inode);
+ fput(filp);
+ return ERR_PTR(-ENODEV);
+ }
+ ibd->ibd_bd = I_BDEV(filp->f_mapping->host);
+ if (!(ibd->ibd_bd)) {
+ printk(KERN_ERR "IBLOCK: Unable to locate struct block_device"
+ " from I_BDEV()\n");
+ iput(inode);
+ fput(filp);
+ return ERR_PTR(-EINVAL);
+ }
+ /*
+ * iblock_create_virtdevice() will call linux_blockdevice_claim()
+ * to claim struct block_device.
+ */
+ dev = iblock_create_virtdevice(se_dev->se_dev_hba, se_dev, (void *)ibd);
+
+ iput(inode);
+ fput(filp);
+ return dev;
+}
+
+void iblock_get_plugin_info(void *p, char *b, int *bl)
+{
+ *bl += sprintf(b + *bl, "TCM iBlock Plugin %s\n", IBLOCK_VERSION);
+}
+
+void iblock_get_hba_info(se_hba_t *hba, char *b, int *bl)
+{
+ iblock_hba_t *ib_host = (iblock_hba_t *)hba->hba_ptr;
+
+ *bl += sprintf(b + *bl, "SE Host ID: %u iBlock Host ID: %u\n",
+ hba->hba_id, ib_host->iblock_host_id);
+ *bl += sprintf(b + *bl, " TCM iBlock HBA\n");
+}
+
+void iblock_get_dev_info(se_device_t *dev, char *b, int *bl)
+{
+ iblock_dev_t *ibd = (iblock_dev_t *) dev->dev_ptr;
+
+ __iblock_get_dev_info(ibd, b, bl);
+}
+
+void __iblock_get_dev_info(iblock_dev_t *ibd, char *b, int *bl)
+{
+ char buf[BDEVNAME_SIZE];
+ struct block_device *bd = ibd->ibd_bd;
+
+ 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 == (iblock_dev_t *)ibd) ?
+ "CLAIMED: IBLOCK" : "CLAIMED: OS");
+ } else {
+ *bl += sprintf(b + *bl, "Major: %d Minor: %d\n",
+ ibd->ibd_major, ibd->ibd_minor);
+ }
+}
+
+static void iblock_bio_destructor(struct bio *bio)
+{
+ se_task_t *task = (se_task_t *)bio->bi_private;
+ iblock_dev_t *ib_dev = (iblock_dev_t *) task->se_dev->dev_ptr;
+
+ bio_free(bio, ib_dev->ibd_bio_set);
+}
+
+static struct bio *iblock_get_bio(se_task_t *task,
+ iblock_req_t *ib_req,
+ iblock_dev_t *ib_dev,
+ int *ret,
+ u64 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;
+}
+
+int iblock_map_task_SG(se_task_t *task)
+{
+ iblock_dev_t *ib_dev = (iblock_dev_t *) task->se_dev->dev_ptr;
+ iblock_req_t *ib_req = (iblock_req_t *) task->transport_req;
+ struct bio *bio = NULL, *hbio = NULL, *tbio = NULL;
+ struct scatterlist *sg = task->task_sg;
+ int ret = 0;
+ u32 i, sg_num = task->task_sg_num;
+ u64 lba = task->task_lba;
+
+ atomic_set(&ib_req->ib_bio_cnt, 0);
+
+ bio = iblock_get_bio(task, ib_req, ib_dev, &ret,
+ task->task_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 se_mem_t -> task->task_sg -> struct scatterlist memory.
+ */
+ for (i = 0; i < 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[i]),
+ sg[i].length, sg[i].offset);
+again:
+ ret = bio_add_page(bio, sg_page(&sg[i]), sg[i].length,
+ sg[i].offset);
+ if (ret != sg[i].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,
+ 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;
+ }
+
+ lba += sg[i].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, lba);
+ DEBUG_IBLOCK("task: %p bio_add_page() passed!, bio->bi_vcnt:"
+ " %u\n", task, bio->bi_vcnt);
+ }
+
+ return task->task_sg_num;
+fail:
+ while (hbio) {
+ bio = hbio;
+ hbio = hbio->bi_next;
+ bio->bi_next = NULL;
+ bio_put(bio);
+ }
+ return ret;
+}
+
+int iblock_CDB_inquiry(se_task_t *task, u32 size)
+{
+ return 0;
+}
+
+int iblock_CDB_none(se_task_t *task, u32 size)
+{
+ return 0;
+}
+
+int iblock_CDB_read_non_SG(se_task_t *task, u32 size)
+{
+ return 0;
+}
+
+int iblock_CDB_read_SG(se_task_t *task, u32 size)
+{
+ return iblock_map_task_SG(task);
+}
+
+int iblock_CDB_write_non_SG(se_task_t *task, u32 size)
+{
+ return 0;
+}
+
+int iblock_CDB_write_SG(se_task_t *task, u32 size)
+{
+ return iblock_map_task_SG(task);
+}
+
+int iblock_check_lba(unsigned long long lba, se_device_t *dev)
+{
+ return 0;
+}
+
+int iblock_check_for_SG(se_task_t *task)
+{
+ return task->task_sg_num;
+}
+
+unsigned char *iblock_get_cdb(se_task_t *task)
+{
+ iblock_req_t *req = (iblock_req_t *) task->transport_req;
+
+ return req->ib_scsi_cdb;
+}
+
+u32 iblock_get_blocksize(se_device_t *dev)
+{
+ iblock_dev_t *ibd = (iblock_dev_t *) dev->dev_ptr;
+
+ return bdev_logical_block_size(ibd->ibd_bd);
+}
+
+u32 iblock_get_device_rev(se_device_t *dev)
+{
+ return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */
+}
+
+u32 iblock_get_device_type(se_device_t *dev)
+{
+ return TYPE_DISK;
+}
+
+u32 iblock_get_dma_length(u32 task_size, se_device_t *dev)
+{
+ return PAGE_SIZE;
+}
+
+u32 iblock_get_max_sectors(se_device_t *dev)
+{
+ iblock_dev_t *ibd = (iblock_dev_t *) dev->dev_ptr;
+ struct request_queue *q = bdev_get_queue(ibd->ibd_bd);
+
+ return q->limits.max_sectors;
+}
+
+u32 iblock_get_queue_depth(se_device_t *dev)
+{
+ return IBLOCK_DEVICE_QUEUE_DEPTH;
+}
+
+u32 iblock_get_max_queue_depth(se_device_t *dev)
+{
+ return IBLOCK_MAX_DEVICE_QUEUE_DEPTH;
+}
+
+void iblock_bio_done(struct bio *bio, int err)
+{
+ se_task_t *task = (se_task_t *)bio->bi_private;
+ iblock_req_t *ibr = (iblock_req_t *)task->transport_req;
+
+ err = test_bit(BIO_UPTODATE, &bio->bi_flags) ? err : -EIO;
+ if (err != 0) {
+ printk(KERN_ERR "test_bit(BIO_UPTODATE) failed for bio: %p,"
+ " err: %d\n", bio, err);
+ transport_complete_task(task, 0);
+ goto out;
+ }
+ 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)))
+ goto out;
+
+ ibr->ib_bio = NULL;
+ transport_complete_task(task, (!err));
+out:
+ return;
+}
diff --git a/include/target/target_core_iblock.h b/include/target/target_core_iblock.h
new file mode 100644
index 0000000..9687f3e
--- /dev/null
+++ b/include/target/target_core_iblock.h
@@ -0,0 +1,173 @@
+/*******************************************************************************
+ * Filename: target_core_iblock.h
+ *
+ * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
+ * Copyright (c) 2005, 2006, 2007 SBE, Inc.
+ * Copyright (c) 2007-2009 Rising Tide Software, Inc.
+ * Copyright (c) 2008-2009 Linux-iSCSI.org
+ *
+ * Nicholas A. Bellinger <nab@...nel.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.
+ *
+ ******************************************************************************/
+
+
+#ifndef TARGET_CORE_IBLOCK_H
+#define TARGET_CORE_IBLOCK_H
+
+#define IBLOCK_VERSION "3.1"
+
+#define IBLOCK_HBA_QUEUE_DEPTH 512
+#define IBLOCK_DEVICE_QUEUE_DEPTH 32
+#define IBLOCK_MAX_DEVICE_QUEUE_DEPTH 128
+#define IBLOCK_MAX_CDBS 16
+#define IBLOCK_LBA_SHIFT 9
+
+extern se_global_t *se_global;
+
+#ifndef IBLOCK_INCLUDE_STRUCTS
+extern int iblock_CDB_inquiry(se_task_t *, u32);
+extern int iblock_CDB_none(se_task_t *, u32);
+extern int iblock_CDB_read_non_SG(se_task_t *, u32);
+extern int iblock_CDB_read_SG(se_task_t *, u32);
+extern int iblock_CDB_write_non_SG(se_task_t *, u32);
+extern int iblock_CDB_write_SG(se_task_t *, u32);
+
+extern int iblock_attach_hba(se_hba_t *, u32);
+extern int iblock_detach_hba(se_hba_t *);
+extern int iblock_claim_phydevice(se_hba_t *, se_device_t *);
+extern int iblock_release_phydevice(se_device_t *);
+extern void *iblock_allocate_virtdevice(se_hba_t *, const char *);
+extern se_device_t *iblock_create_virtdevice(se_hba_t *, se_subsystem_dev_t *,
+ void *);
+extern int iblock_activate_device(se_device_t *);
+extern void iblock_deactivate_device(se_device_t *);
+extern void iblock_free_device(void *);
+extern int iblock_transport_complete(se_task_t *);
+extern void *iblock_allocate_request(se_task_t *, se_device_t *);
+extern int iblock_do_task(se_task_t *);
+extern void iblock_free_task(se_task_t *);
+extern ssize_t iblock_set_configfs_dev_params(se_hba_t *, se_subsystem_dev_t *,
+ const char *, ssize_t);
+extern ssize_t iblock_check_configfs_dev_params(se_hba_t *,
+ se_subsystem_dev_t *);
+extern ssize_t iblock_show_configfs_dev_params(se_hba_t *, se_subsystem_dev_t *,
+ char *);
+extern se_device_t *iblock_create_virtdevice_from_fd(se_subsystem_dev_t *,
+ const char *);
+extern void iblock_get_plugin_info(void *, char *, int *);
+extern void iblock_get_hba_info(se_hba_t *, char *, int *);
+extern void iblock_get_dev_info(se_device_t *, char *, int *);
+extern int iblock_check_lba(unsigned long long, se_device_t *);
+extern int iblock_check_for_SG(se_task_t *);
+extern unsigned char *iblock_get_cdb(se_task_t *);
+extern u32 iblock_get_blocksize(se_device_t *);
+extern u32 iblock_get_device_rev(se_device_t *);
+extern u32 iblock_get_device_type(se_device_t *);
+extern u32 iblock_get_dma_length(u32, se_device_t *);
+extern u32 iblock_get_max_sectors(se_device_t *);
+extern u32 iblock_get_queue_depth(se_device_t *);
+extern u32 iblock_get_max_queue_depth(se_device_t *);
+extern void iblock_bio_done(struct bio *, int);
+#endif /* ! IBLOCK_INCLUDE_STRUCTS */
+
+typedef struct iblock_req_s {
+ unsigned char ib_scsi_cdb[SCSI_CDB_SIZE];
+ atomic_t ib_bio_cnt;
+ u32 ib_sg_count;
+ void *ib_buf;
+ struct bio *ib_bio;
+ struct iblock_dev_s *ib_dev;
+} ____cacheline_aligned iblock_req_t;
+
+#define IBDF_HAS_UDEV_PATH 0x01
+#define IBDF_HAS_MAJOR 0x02
+#define IBDF_HAS_MINOR 0x04
+#define IBDF_HAS_FORCE 0x08
+
+typedef struct iblock_dev_s {
+ unsigned char ibd_udev_path[SE_UDEV_PATH_LEN];
+ int ibd_force;
+ int ibd_major;
+ int ibd_minor;
+ u32 ibd_depth;
+ u32 ibd_flags;
+ struct bio_set *ibd_bio_set;
+ struct block_device *ibd_bd;
+ struct iblock_hba_s *ibd_host;
+} ____cacheline_aligned iblock_dev_t;
+
+void __iblock_get_dev_info(iblock_dev_t *, char *, int *);
+
+typedef struct iblock_hba_s {
+ int iblock_host_id;
+} ____cacheline_aligned iblock_hba_t;
+
+#ifndef IBLOCK_INCLUDE_STRUCTS
+/*
+ * We use the generic command sequencer, so we must setup
+ * se_subsystem_spc_t.
+ */
+se_subsystem_spc_t iblock_template_spc = {
+ .inquiry = iblock_CDB_inquiry,
+ .none = iblock_CDB_none,
+ .read_non_SG = iblock_CDB_read_non_SG,
+ .read_SG = iblock_CDB_read_SG,
+ .write_non_SG = iblock_CDB_write_non_SG,
+ .write_SG = iblock_CDB_write_SG,
+};
+
+se_subsystem_api_t iblock_template = {
+ .name = "iblock",
+ .type = IBLOCK,
+ .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV,
+ .attach_hba = iblock_attach_hba,
+ .detach_hba = iblock_detach_hba,
+ .claim_phydevice = iblock_claim_phydevice,
+ .allocate_virtdevice = iblock_allocate_virtdevice,
+ .create_virtdevice = iblock_create_virtdevice,
+ .activate_device = iblock_activate_device,
+ .deactivate_device = iblock_deactivate_device,
+ .free_device = iblock_free_device,
+ .release_phydevice = iblock_release_phydevice,
+ .transport_complete = iblock_transport_complete,
+ .allocate_request = iblock_allocate_request,
+ .do_task = iblock_do_task,
+ .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,
+ .create_virtdevice_from_fd = iblock_create_virtdevice_from_fd,
+ .get_plugin_info = iblock_get_plugin_info,
+ .get_hba_info = iblock_get_hba_info,
+ .get_dev_info = iblock_get_dev_info,
+ .check_lba = iblock_check_lba,
+ .check_for_SG = iblock_check_for_SG,
+ .get_cdb = iblock_get_cdb,
+ .get_blocksize = iblock_get_blocksize,
+ .get_device_rev = iblock_get_device_rev,
+ .get_device_type = iblock_get_device_type,
+ .get_dma_length = iblock_get_dma_length,
+ .get_max_sectors = iblock_get_max_sectors,
+ .get_queue_depth = iblock_get_queue_depth,
+ .get_max_queue_depth = iblock_get_max_queue_depth,
+ .write_pending = NULL,
+ .spc = &iblock_template_spc,
+};
+
+#endif /* IBLOCK_INCLUDE_STRUCTS */
+
+#endif /* TARGET_CORE_IBLOCK_H */
--
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