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Subject[PATCH 05/18] osd_uld: OSD scsi ULD
Date
Add a Linux driver module that registers as a SCSI ULD and probes
for OSD type SCSI devices.

When an OSD-type SCSI device is found a character device is created
in the form of /dev/osdX - where X goes from 0 up to hard coded 64.
The Major character device number used is *260*, which is free
(as of Linux v2.6.28-rc3).

A single ioctl is currently supported that will invoke an in-kernel
test on the specified OSD device (lun).

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Reviewed-by: Benny Halevy <bhalevy@panasas.com>
---
drivers/scsi/osd/Kbuild | 7 +
drivers/scsi/osd/osd_ktests.h | 27 +++
drivers/scsi/osd/osd_uld.c | 388 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 422 insertions(+), 0 deletions(-)
create mode 100644 drivers/scsi/osd/osd_ktests.h
create mode 100644 drivers/scsi/osd/osd_uld.c
diff --git a/drivers/scsi/osd/Kbuild b/drivers/scsi/osd/Kbuild
index b4678e0..f39f82f 100644
--- a/drivers/scsi/osd/Kbuild
+++ b/drivers/scsi/osd/Kbuild
@@ -17,6 +17,9 @@ ifneq ($(OSD_INC),)
CONFIG_SCSI_OSD_INITIATOR=m
EXTRA_CFLAGS += -DCONFIG_SCSI_OSD_INITIATOR -DCONFIG_SCSI_OSD_INITIATOR_MODULE

+CONFIG_SCSI_OSD_ULD=m
+EXTRA_CFLAGS += -DCONFIG_SCSI_OSD_ULD -DCONFIG_SCSI_OSD_ULD_MODULE
+
EXTRA_CFLAGS += -I$(OSD_INC)
# EXTRA_CFLAGS += -DCONFIG_SCSI_OSD_DEBUG

@@ -24,3 +27,7 @@ endif

libosd-objs := osd_initiator.o
obj-$(CONFIG_SCSI_OSD_INITIATOR) += libosd.o
+
+# osd.ko - SCSI ULD and char-device
+osd-objs := osd_uld.o
+obj-$(CONFIG_SCSI_OSD_ULD) += osd.o
diff --git a/drivers/scsi/osd/osd_ktests.h b/drivers/scsi/osd/osd_ktests.h
new file mode 100644
index 0000000..a9e5e00
--- /dev/null
+++ b/drivers/scsi/osd/osd_ktests.h
@@ -0,0 +1,27 @@
+/*
+ * osd_ktests.h - Define the ktests.c API
+ *
+ * Copyright (C) 2008 Panasas Inc. All rights reserved.
+ *
+ * Authors:
+ * Boaz Harrosh <bharrosh@panasas.com>
+ * Benny Halevy <bhalevy@panasas.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ *
+ */
+#ifndef __OSD_KTESTS_H__
+#define __OSD_KTESTS_H__
+
+/* Tests from osd_ktests.c */
+/* TODO: Only one simple test for now. Later I will add a test definition
+ * structure that will define what tests to preform and with some
+ * parametrization, so concurrent tests could be run on same OSD lun
+ * without stepping on each other. (E.g. Format called when other tests
+ * are in progress)
+ */
+
+enum { OSD_TEST_ALL = 17 };
+
+#endif /*ndef __OSD_KTESTS_H__*/
diff --git a/drivers/scsi/osd/osd_uld.c b/drivers/scsi/osd/osd_uld.c
new file mode 100644
index 0000000..87b4540
--- /dev/null
+++ b/drivers/scsi/osd/osd_uld.c
@@ -0,0 +1,388 @@
+/*
+ * osd_uld.c - OSD Upper Layer Driver
+ *
+ * A Linux driver module that registers as a SCSI ULD and probes
+ * for OSD type SCSI devices.
+ * It's main function is to export osd devices to in-kernel users like
+ * osdfs and pNFS-objects-LD. It also provides one ioctl for running
+ * in Kernel tests.
+ *
+ * Copyright (C) 2008 Panasas Inc. All rights reserved.
+ *
+ * Authors:
+ * Boaz Harrosh <bharrosh@panasas.com>
+ * Benny Halevy <bhalevy@panasas.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ *
+ * 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.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Panasas company nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, 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 DAMAGE.
+ */
+
+#include <linux/cdev.h>
+#include <linux/fs.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/idr.h>
+#include <linux/major.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_driver.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_ioctl.h>
+
+#include <scsi/osd_initiator.h>
+#include <scsi/osd_sec.h>
+
+#include "osd_ktests.h"
+#include "osd_debug.h"
+
+#ifndef TYPE_OSD
+# define TYPE_OSD 0x11
+#endif
+
+#ifndef SCSI_OSD_MAJOR
+# define SCSI_OSD_MAJOR 260
+#endif
+#define SCSI_OSD_MAX_MINOR 64
+
+static const char osd_name[] = "osd";
+static const char *osd_version_string = "open-osd 0.1.0";
+const char osd_symlink[] = "scsi_osd";
+
+MODULE_AUTHOR("Boaz Harrosh <bharrosh@panasas.com>");
+MODULE_DESCRIPTION("open-osd Upper-Layer-Driver osd.ko");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_CHARDEV_MAJOR(SCSI_OSD_MAJOR);
+MODULE_ALIAS_SCSI_DEVICE(TYPE_OSD);
+
+struct osd_uld_device {
+ int minor;
+ struct kref kref;
+ struct cdev cdev;
+ struct osd_dev od;
+ struct gendisk *disk;
+ struct device *class_member;
+};
+
+static void __uld_get(struct osd_uld_device *oud);
+static void __uld_put(struct osd_uld_device *oud);
+
+/*
+ * Char Device operations
+ */
+
+static int osd_uld_open(struct inode *inode, struct file *file)
+{
+ struct osd_uld_device *oud = container_of(inode->i_cdev,
+ struct osd_uld_device, cdev);
+
+ __uld_get(oud);
+ /* cache osd_uld_device on file handle */
+ file->private_data = oud;
+ OSD_DEBUG("osd_uld_open %p\n", oud);
+ return 0;
+}
+
+static int osd_uld_release(struct inode *inode, struct file *file)
+{
+ struct osd_uld_device *oud = file->private_data;
+
+ OSD_DEBUG("osd_uld_release %p\n", file->private_data);
+ file->private_data = NULL;
+ __uld_put(oud);
+ return 0;
+}
+
+static long osd_uld_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ struct osd_uld_device *oud = file->private_data;
+ int ret;
+
+ switch (cmd) {
+ case OSD_TEST_ALL:
+ OSD_DEBUG("Kernel test %d: osd_uld_device=%p\n", cmd, oud);
+ ret = 0;
+ break;
+ default:
+ OSD_ERR("Unknown osd_uld_ioctl %d\n", cmd);
+ ret = -ENOIOCTLCMD;
+ }
+ return ret;
+}
+
+static const struct file_operations osd_fops = {
+ .owner = THIS_MODULE,
+ .open = osd_uld_open,
+ .release = osd_uld_release,
+ .unlocked_ioctl = osd_uld_ioctl,
+};
+
+/*
+ * Scsi Device operations
+ */
+
+static int __detect_osd(struct osd_uld_device *oud)
+{
+ struct scsi_device *scsi_dev = oud->od.scsi_dev;
+ int error;
+
+ /* sending a test_unit_ready as first command seems to be needed
+ * by some targets
+ */
+ OSD_DEBUG("start scsi_test_unit_ready %p %p %p\n",
+ oud, scsi_dev, scsi_dev->request_queue);
+ error = scsi_test_unit_ready(scsi_dev, 10*HZ, 5, NULL);
+ if (error)
+ OSD_ERR("warning: scsi_test_unit_ready failed\n");
+
+ return 0;
+}
+
+static struct class *osd_sysfs_class;
+static DEFINE_IDA(osd_minor_ida);
+
+static int osd_probe(struct device *dev)
+{
+ struct scsi_device *scsi_dev = to_scsi_device(dev);
+ struct gendisk *disk;
+ struct osd_uld_device *oud;
+ int minor;
+ int error;
+
+ if (scsi_dev->type != TYPE_OSD)
+ return -ENODEV;
+
+ do {
+ if (!ida_pre_get(&osd_minor_ida, GFP_KERNEL))
+ return -ENODEV;
+
+ error = ida_get_new(&osd_minor_ida, &minor);
+ } while (error == -EAGAIN);
+
+ if (error)
+ return error;
+ if (minor >= SCSI_OSD_MAX_MINOR) {
+ error = -EBUSY;
+ goto err_retract_minor;
+ }
+
+ error = -ENOMEM;
+ oud = kzalloc(sizeof(*oud), GFP_KERNEL);
+ if (NULL == oud)
+ goto err_retract_minor;
+
+ kref_init(&oud->kref);
+ dev_set_drvdata(dev, oud);
+ oud->minor = minor;
+
+ /* allocate a disk and set it up */
+ /* FIXME: do we need this since sg has already done that */
+ disk = alloc_disk(1);
+ if (!disk) {
+ OSD_ERR("alloc_disk failed\n");
+ goto err_free_osd;
+ }
+ disk->major = SCSI_OSD_MAJOR;
+ disk->first_minor = oud->minor;
+ sprintf(disk->disk_name, "osd%d", oud->minor);
+ oud->disk = disk;
+
+ /* hold one more reference to the scsi_dev that will get released
+ * in __release, in case a logout is happening while fs is mounted
+ */
+ scsi_device_get(scsi_dev);
+ osd_dev_init(&oud->od, scsi_dev);
+
+ /* Detect the OSD Version */
+ error = __detect_osd(oud);
+ if (error) {
+ OSD_ERR("osd detection failed, non-compatible OSD device\n");
+ goto err_put_disk;
+ }
+
+ /* init the char-device for communication with user-mode */
+ cdev_init(&oud->cdev, &osd_fops);
+ oud->cdev.owner = THIS_MODULE;
+ error = cdev_add(&oud->cdev,
+ MKDEV(SCSI_OSD_MAJOR, oud->minor), 1);
+ if (error) {
+ OSD_ERR("cdev_add failed\n");
+ goto err_put_disk;
+ }
+ kobject_get(&oud->cdev.kobj); /* 2nd ref see osd_remove() */
+
+ /* class_member */
+ oud->class_member = device_create(osd_sysfs_class, dev,
+ MKDEV(SCSI_OSD_MAJOR, oud->minor), "%s", disk->disk_name);
+ if (IS_ERR(oud->class_member)) {
+ OSD_ERR("class_device_create failed\n");
+ error = PTR_ERR(oud->class_member);
+ goto err_put_cdev;
+ }
+
+ dev_set_drvdata(oud->class_member, oud);
+ error = sysfs_create_link(&scsi_dev->sdev_gendev.kobj,
+ &oud->class_member->kobj, osd_symlink);
+ if (error)
+ OSD_ERR("warning: unable to make symlink\n");
+
+ OSD_INFO("osd_probe %s\n", disk->disk_name);
+ return 0;
+
+err_put_cdev:
+ cdev_del(&oud->cdev);
+err_put_disk:
+ scsi_device_put(scsi_dev);
+ put_disk(disk);
+err_free_osd:
+ dev_set_drvdata(dev, NULL);
+ kfree(oud);
+err_retract_minor:
+ ida_remove(&osd_minor_ida, minor);
+ return error;
+}
+
+static int osd_remove(struct device *dev)
+{
+ struct scsi_device *scsi_dev = to_scsi_device(dev);
+ struct osd_uld_device *oud = dev_get_drvdata(dev);
+
+ if (!oud || (oud->od.scsi_dev != scsi_dev)) {
+ OSD_ERR("Half cooked osd-device %p,%p || %p!=%p",
+ dev, oud, oud ? oud->od.scsi_dev : NULL,
+ scsi_dev);
+ }
+
+ sysfs_remove_link(&oud->od.scsi_dev->sdev_gendev.kobj, osd_symlink);
+
+ if (oud->class_member)
+ device_destroy(osd_sysfs_class,
+ MKDEV(SCSI_OSD_MAJOR, oud->minor));
+
+ /* We have 2 references to the cdev. One is released here
+ * and also takes down the /dev/osdX mapping. The second
+ * Will be released in __remove() after all users have released
+ * the osd_uld_device.
+ */
+ if (oud->cdev.owner)
+ cdev_del(&oud->cdev);
+
+ __uld_put(oud);
+ return 0;
+}
+
+static void __remove(struct kref *kref)
+{
+ struct osd_uld_device *oud = container_of(kref,
+ struct osd_uld_device, kref);
+ struct scsi_device *scsi_dev = oud->od.scsi_dev;
+
+ /* now let delete the char_dev */
+ kobject_put(&oud->cdev.kobj);
+
+ osd_dev_fini(&oud->od);
+ scsi_device_put(scsi_dev);
+
+ OSD_INFO("osd_remove %s\n",
+ oud->disk ? oud->disk->disk_name : NULL);
+
+ if (oud->disk)
+ put_disk(oud->disk);
+
+ ida_remove(&osd_minor_ida, oud->minor);
+ kfree(oud);
+}
+
+static void __uld_get(struct osd_uld_device *oud)
+{
+ kref_get(&oud->kref);
+}
+
+static void __uld_put(struct osd_uld_device *oud)
+{
+ kref_put(&oud->kref, __remove);
+}
+
+/*
+ * Global driver and scsi registration
+ */
+
+static struct scsi_driver osd_driver = {
+ .owner = THIS_MODULE,
+ .gendrv = {
+ .name = osd_name,
+ .probe = osd_probe,
+ .remove = osd_remove,
+ }
+};
+
+static int __init osd_uld_init(void)
+{
+ int err;
+
+ osd_sysfs_class = class_create(THIS_MODULE, osd_symlink);
+ if (IS_ERR(osd_sysfs_class)) {
+ OSD_ERR("Unable to register sysfs class => %ld\n",
+ PTR_ERR(osd_sysfs_class));
+ return PTR_ERR(osd_sysfs_class);
+ }
+
+ err = register_chrdev_region(MKDEV(SCSI_OSD_MAJOR, 0),
+ SCSI_OSD_MAX_MINOR, osd_name);
+ if (err) {
+ OSD_ERR("Unable to register major %d for osd ULD => %d\n",
+ SCSI_OSD_MAJOR, err);
+ goto err_out;
+ }
+
+ err = scsi_register_driver(&osd_driver.gendrv);
+ if (err) {
+ OSD_ERR("scsi_register_driver failed => %d\n", err);
+ goto err_out_chrdev;
+ }
+
+ OSD_INFO("LOADED %s\n", osd_version_string);
+ return 0;
+
+err_out_chrdev:
+ unregister_chrdev_region(MKDEV(SCSI_OSD_MAJOR, 0), SCSI_OSD_MAX_MINOR);
+err_out:
+ class_destroy(osd_sysfs_class);
+ return err;
+}
+
+static void __exit osd_uld_exit(void)
+{
+ scsi_unregister_driver(&osd_driver.gendrv);
+ unregister_chrdev_region(MKDEV(SCSI_OSD_MAJOR, 0), SCSI_OSD_MAX_MINOR);
+ class_destroy(osd_sysfs_class);
+ OSD_INFO("UNLOADED %s\n", osd_version_string);
+}
+
+module_init(osd_uld_init);
+module_exit(osd_uld_exit);
--
1.6.0.1


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