[deliverable/linux.git] / drivers / scsi / osd / osd_uld.c

/*
 * 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/namei.h>
#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 <linux/file.h>
#include <linux/slab.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_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 MINORMASK

static const char osd_name[] = "osd";
static const char *osd_version_string = "open-osd 0.2.1";

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 device class_dev;
	struct cdev cdev;
	struct osd_dev od;
	struct osd_dev_info odi;
	struct gendisk *disk;
};

struct osd_dev_handle {
	struct osd_dev od;
	struct file *file;
	struct osd_uld_device *oud;
} ;

static DEFINE_IDA(osd_minor_ida);

/*
 * scsi sysfs attribute operations
 */
static ssize_t osdname_show(struct device *dev, struct device_attribute *attr,
			    char *buf)
{
	struct osd_uld_device *ould = container_of(dev, struct osd_uld_device,
						   class_dev);
	return sprintf(buf, "%s\n", ould->odi.osdname);
}

static ssize_t systemid_show(struct device *dev, struct device_attribute *attr,
			    char *buf)
{
	struct osd_uld_device *ould = container_of(dev, struct osd_uld_device,
						   class_dev);

	memcpy(buf, ould->odi.systemid, ould->odi.systemid_len);
	return ould->odi.systemid_len;
}

static struct device_attribute osd_uld_attrs[] = {
	__ATTR(osdname, S_IRUGO, osdname_show, NULL),
	__ATTR(systemid, S_IRUGO, systemid_show, NULL),
	__ATTR_NULL,
};

static struct class osd_uld_class = {
	.owner		= THIS_MODULE,
	.name		= "scsi_osd",
	.dev_attrs	= osd_uld_attrs,
};

/*
 * 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);

	get_device(&oud->class_dev);
	/* 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;
	put_device(&oud->class_dev);
	return 0;
}

/* FIXME: Only one vector for now */
unsigned g_test_ioctl;
do_test_fn *g_do_test;

int osduld_register_test(unsigned ioctl, do_test_fn *do_test)
{
	if (g_test_ioctl)
		return -EINVAL;

	g_test_ioctl = ioctl;
	g_do_test = do_test;
	return 0;
}
EXPORT_SYMBOL(osduld_register_test);

void osduld_unregister_test(unsigned ioctl)
{
	if (ioctl == g_test_ioctl) {
		g_test_ioctl = 0;
		g_do_test = NULL;
	}
}
EXPORT_SYMBOL(osduld_unregister_test);

static do_test_fn *_find_ioctl(unsigned cmd)
{
	if (g_test_ioctl == cmd)
		return g_do_test;
	else
		return NULL;
}

static long osd_uld_ioctl(struct file *file, unsigned int cmd,
	unsigned long arg)
{
	struct osd_uld_device *oud = file->private_data;
	int ret;
	do_test_fn *do_test;

	do_test = _find_ioctl(cmd);
	if (do_test)
		ret = do_test(&oud->od, cmd, arg);
	else {
		OSD_ERR("Unknown ioctl %d: osd_uld_device=%p\n", cmd, oud);
		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,
	.llseek		= noop_llseek,
};

struct osd_dev *osduld_path_lookup(const char *name)
{
	struct osd_uld_device *oud;
	struct osd_dev_handle *odh;
	struct file *file;
	int error;

	if (!name || !*name) {
		OSD_ERR("Mount with !path || !*path\n");
		return ERR_PTR(-EINVAL);
	}

	odh = kzalloc(sizeof(*odh), GFP_KERNEL);
	if (unlikely(!odh))
		return ERR_PTR(-ENOMEM);

	file = filp_open(name, O_RDWR, 0);
	if (IS_ERR(file)) {
		error = PTR_ERR(file);
		goto free_od;
	}

	if (file->f_op != &osd_fops){
		error = -EINVAL;
		goto close_file;
	}

	oud = file->private_data;

	odh->od = oud->od;
	odh->file = file;
	odh->oud = oud;

	return &odh->od;

close_file:
	fput(file);
free_od:
	kfree(odh);
	return ERR_PTR(error);
}
EXPORT_SYMBOL(osduld_path_lookup);

static inline bool _the_same_or_null(const u8 *a1, unsigned a1_len,
				     const u8 *a2, unsigned a2_len)
{
	if (!a2_len) /* User string is Empty means don't care */
		return true;

	if (a1_len != a2_len)
		return false;

	return 0 == memcmp(a1, a2, a1_len);
}

struct find_oud_t {
	const struct osd_dev_info *odi;
	struct device *dev;
	struct osd_uld_device *oud;
} ;

int _mach_odi(struct device *dev, void *find_data)
{
	struct osd_uld_device *oud = container_of(dev, struct osd_uld_device,
						  class_dev);
	struct find_oud_t *fot = find_data;
	const struct osd_dev_info *odi = fot->odi;

	if (_the_same_or_null(oud->odi.systemid, oud->odi.systemid_len,
			      odi->systemid, odi->systemid_len) &&
	    _the_same_or_null(oud->odi.osdname, oud->odi.osdname_len,
			      odi->osdname, odi->osdname_len)) {
		OSD_DEBUG("found device sysid_len=%d osdname=%d\n",
			  odi->systemid_len, odi->osdname_len);
		fot->oud = oud;
		return 1;
	} else {
		return 0;
	}
}

/* osduld_info_lookup - Loop through all devices, return the requested osd_dev.
 *
 * if @odi->systemid_len and/or @odi->osdname_len are zero, they act as a don't
 * care. .e.g if they're both zero /dev/osd0 is returned.
 */
struct osd_dev *osduld_info_lookup(const struct osd_dev_info *odi)
{
	struct find_oud_t find = {.odi = odi};

	find.dev = class_find_device(&osd_uld_class, NULL, &find, _mach_odi);
	if (likely(find.dev)) {
		struct osd_dev_handle *odh = kzalloc(sizeof(*odh), GFP_KERNEL);

		if (unlikely(!odh)) {
			put_device(find.dev);
			return ERR_PTR(-ENOMEM);
		}

		odh->od = find.oud->od;
		odh->oud = find.oud;

		return &odh->od;
	}

	return ERR_PTR(-ENODEV);
}
EXPORT_SYMBOL(osduld_info_lookup);

void osduld_put_device(struct osd_dev *od)
{
	if (od && !IS_ERR(od)) {
		struct osd_dev_handle *odh =
				container_of(od, struct osd_dev_handle, od);
		struct osd_uld_device *oud = odh->oud;

		BUG_ON(od->scsi_device != oud->od.scsi_device);

		/* If scsi has released the device (logout), and exofs has last
		 * reference on oud it will be freed by above osd_uld_release
		 * within fput below. But this will oops in cdev_release which
		 * is called after the fops->release. A get_/put_ pair makes
		 * sure we have a cdev for the duration of fput
		 */
		if (odh->file) {
			get_device(&oud->class_dev);
			fput(odh->file);
		}
		put_device(&oud->class_dev);
		kfree(odh);
	}
}
EXPORT_SYMBOL(osduld_put_device);

const struct osd_dev_info *osduld_device_info(struct osd_dev *od)
{
	struct osd_dev_handle *odh =
				container_of(od, struct osd_dev_handle, od);
	return &odh->oud->odi;
}
EXPORT_SYMBOL(osduld_device_info);

bool osduld_device_same(struct osd_dev *od, const struct osd_dev_info *odi)
{
	struct osd_dev_handle *odh =
				container_of(od, struct osd_dev_handle, od);
	struct osd_uld_device *oud = odh->oud;

	return (oud->odi.systemid_len == odi->systemid_len) &&
		_the_same_or_null(oud->odi.systemid, oud->odi.systemid_len,
				 odi->systemid, odi->systemid_len) &&
		(oud->odi.osdname_len == odi->osdname_len) &&
		_the_same_or_null(oud->odi.osdname, oud->odi.osdname_len,
				  odi->osdname, odi->osdname_len);
}
EXPORT_SYMBOL(osduld_device_same);

/*
 * Scsi Device operations
 */

static int __detect_osd(struct osd_uld_device *oud)
{
	struct scsi_device *scsi_device = oud->od.scsi_device;
	char caps[OSD_CAP_LEN];
	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_device, scsi_device->request_queue);
	error = scsi_test_unit_ready(scsi_device, 10*HZ, 5, NULL);
	if (error)
		OSD_ERR("warning: scsi_test_unit_ready failed\n");

	osd_sec_init_nosec_doall_caps(caps, &osd_root_object, false, true);
	if (osd_auto_detect_ver(&oud->od, caps, &oud->odi))
		return -ENODEV;

	return 0;
}

static void __remove(struct device *dev)
{
	struct osd_uld_device *oud = container_of(dev, struct osd_uld_device,
						  class_dev);
	struct scsi_device *scsi_device = oud->od.scsi_device;

	kfree(oud->odi.osdname);

	if (oud->cdev.owner)
		cdev_del(&oud->cdev);

	osd_dev_fini(&oud->od);
	scsi_device_put(scsi_device);

	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 int osd_probe(struct device *dev)
{
	struct scsi_device *scsi_device = to_scsi_device(dev);
	struct gendisk *disk;
	struct osd_uld_device *oud;
	int minor;
	int error;

	if (scsi_device->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;

	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_device that will get released
	 * in __release, in case a logout is happening while fs is mounted
	 */
	scsi_device_get(scsi_device);
	osd_dev_init(&oud->od, scsi_device);

	/* 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;
	}

	/* class device member */
	oud->class_dev.devt = oud->cdev.dev;
	oud->class_dev.class = &osd_uld_class;
	oud->class_dev.parent = dev;
	oud->class_dev.release = __remove;
	error = dev_set_name(&oud->class_dev, disk->disk_name);
	if (error) {
		OSD_ERR("dev_set_name failed => %d\n", error);
		goto err_put_cdev;
	}

	error = device_register(&oud->class_dev);
	if (error) {
		OSD_ERR("device_register failed => %d\n", error);
		goto err_put_cdev;
	}

	get_device(&oud->class_dev);

	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_device);
	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_device = to_scsi_device(dev);
	struct osd_uld_device *oud = dev_get_drvdata(dev);

	if (!oud || (oud->od.scsi_device != scsi_device)) {
		OSD_ERR("Half cooked osd-device %p,%p || %p!=%p",
			dev, oud, oud ? oud->od.scsi_device : NULL,
			scsi_device);
	}

	device_unregister(&oud->class_dev);

	put_device(&oud->class_dev);
	return 0;
}

/*
 * 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;

	err = class_register(&osd_uld_class);
	if (err) {
		OSD_ERR("Unable to register sysfs class => %d\n", err);
		return err;
	}

	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_unregister(&osd_uld_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_unregister(&osd_uld_class);
	OSD_INFO("UNLOADED %s\n", osd_version_string);
}

module_init(osd_uld_init);
module_exit(osd_uld_exit);
Commit	Line	Data
95b05a7d BH	1	/*
	2	* osd_uld.c - OSD Upper Layer Driver
	3	*
	4	* A Linux driver module that registers as a SCSI ULD and probes
	5	* for OSD type SCSI devices.
	6	* It's main function is to export osd devices to in-kernel users like
	7	* osdfs and pNFS-objects-LD. It also provides one ioctl for running
	8	* in Kernel tests.
	9	*
	10	* Copyright (C) 2008 Panasas Inc. All rights reserved.
	11	*
	12	* Authors:
	13	* Boaz Harrosh <bharrosh@panasas.com>
	14	* Benny Halevy <bhalevy@panasas.com>
	15	*
	16	* This program is free software; you can redistribute it and/or modify
	17	* it under the terms of the GNU General Public License version 2
	18	*
	19	* Redistribution and use in source and binary forms, with or without
	20	* modification, are permitted provided that the following conditions
	21	* are met:
	22	*
	23	* 1. Redistributions of source code must retain the above copyright
	24	* notice, this list of conditions and the following disclaimer.
	25	* 2. Redistributions in binary form must reproduce the above copyright
	26	* notice, this list of conditions and the following disclaimer in the
	27	* documentation and/or other materials provided with the distribution.
	28	* 3. Neither the name of the Panasas company nor the names of its
	29	* contributors may be used to endorse or promote products derived
	30	* from this software without specific prior written permission.
	31	*
	32	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
	33	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
	34	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	35	* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	36	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	37	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	38	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
	39	* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
	40	* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
	41	* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
	42	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	43	*/
	44
	45	#include <linux/namei.h>
	46	#include <linux/cdev.h>
	47	#include <linux/fs.h>
	48	#include <linux/module.h>
	49	#include <linux/device.h>
	50	#include <linux/idr.h>
	51	#include <linux/major.h>
021e2230	52	#include <linux/file.h>
5a0e3ad6	53	#include <linux/slab.h>
95b05a7d BH	54
	55	#include <scsi/scsi.h>
	56	#include <scsi/scsi_driver.h>
	57	#include <scsi/scsi_device.h>
	58	#include <scsi/scsi_ioctl.h>
	59
	60	#include <scsi/osd_initiator.h>
	61	#include <scsi/osd_sec.h>
	62
	63	#include "osd_debug.h"
	64
	65	#ifndef TYPE_OSD
	66	# define TYPE_OSD 0x11
	67	#endif
	68
	69	#ifndef SCSI_OSD_MAJOR
	70	# define SCSI_OSD_MAJOR 260
	71	#endif
41f8ad76	72	#define SCSI_OSD_MAX_MINOR MINORMASK
95b05a7d BH	73
95b05a7d BH	74	static const char osd_name[] = "osd";
41f8ad76	75	static const char *osd_version_string = "open-osd 0.2.1";
95b05a7d BH	76
	77	MODULE_AUTHOR("Boaz Harrosh <bharrosh@panasas.com>");
	78	MODULE_DESCRIPTION("open-osd Upper-Layer-Driver osd.ko");
	79	MODULE_LICENSE("GPL");
	80	MODULE_ALIAS_CHARDEV_MAJOR(SCSI_OSD_MAJOR);
	81	MODULE_ALIAS_SCSI_DEVICE(TYPE_OSD);
	82
	83	struct osd_uld_device {
	84	int minor;
d6ae4333	85	struct device class_dev;
95b05a7d BH	86	struct cdev cdev;
95b05a7d BH	87	struct osd_dev od;
2cdd6410	88	struct osd_dev_info odi;
95b05a7d	89	struct gendisk *disk;
95b05a7d BH	90	};
95b05a7d BH	91
d6ae4333 BH	92	struct osd_dev_handle {
	93	struct osd_dev od;
	94	struct file *file;
	95	struct osd_uld_device *oud;
	96	} ;
	97
	98	static DEFINE_IDA(osd_minor_ida);
	99
51976a8c BH	100	/*
	101	* scsi sysfs attribute operations
	102	*/
	103	static ssize_t osdname_show(struct device dev, struct device_attribute attr,
	104	char *buf)
	105	{
	106	struct osd_uld_device *ould = container_of(dev, struct osd_uld_device,
	107	class_dev);
	108	return sprintf(buf, "%s\n", ould->odi.osdname);
	109	}
	110
	111	static ssize_t systemid_show(struct device dev, struct device_attribute attr,
	112	char *buf)
	113	{
	114	struct osd_uld_device *ould = container_of(dev, struct osd_uld_device,
	115	class_dev);
	116
	117	memcpy(buf, ould->odi.systemid, ould->odi.systemid_len);
	118	return ould->odi.systemid_len;
	119	}
	120
	121	static struct device_attribute osd_uld_attrs[] = {
	122	__ATTR(osdname, S_IRUGO, osdname_show, NULL),
	123	__ATTR(systemid, S_IRUGO, systemid_show, NULL),
	124	__ATTR_NULL,
	125	};
	126
d6ae4333 BH	127	static struct class osd_uld_class = {
	128	.owner = THIS_MODULE,
	129	.name = "scsi_osd",
51976a8c	130	.dev_attrs = osd_uld_attrs,
d6ae4333	131	};
95b05a7d BH	132
	133	/*
	134	* Char Device operations
	135	*/
	136
	137	static int osd_uld_open(struct inode inode, struct file file)
	138	{
	139	struct osd_uld_device *oud = container_of(inode->i_cdev,
	140	struct osd_uld_device, cdev);
	141
d6ae4333	142	get_device(&oud->class_dev);
95b05a7d BH	143	/* cache osd_uld_device on file handle */
	144	file->private_data = oud;
	145	OSD_DEBUG("osd_uld_open %p\n", oud);
	146	return 0;
	147	}
	148
	149	static int osd_uld_release(struct inode inode, struct file file)
	150	{
	151	struct osd_uld_device *oud = file->private_data;
	152
	153	OSD_DEBUG("osd_uld_release %p\n", file->private_data);
	154	file->private_data = NULL;
d6ae4333	155	put_device(&oud->class_dev);
95b05a7d BH	156	return 0;
	157	}
	158
	159	/* FIXME: Only one vector for now */
	160	unsigned g_test_ioctl;
	161	do_test_fn *g_do_test;
	162
	163	int osduld_register_test(unsigned ioctl, do_test_fn *do_test)
	164	{
	165	if (g_test_ioctl)
	166	return -EINVAL;
	167
	168	g_test_ioctl = ioctl;
	169	g_do_test = do_test;
	170	return 0;
	171	}
	172	EXPORT_SYMBOL(osduld_register_test);
	173
	174	void osduld_unregister_test(unsigned ioctl)
	175	{
	176	if (ioctl == g_test_ioctl) {
	177	g_test_ioctl = 0;
	178	g_do_test = NULL;
	179	}
	180	}
	181	EXPORT_SYMBOL(osduld_unregister_test);
	182
	183	static do_test_fn *_find_ioctl(unsigned cmd)
	184	{
	185	if (g_test_ioctl == cmd)
	186	return g_do_test;
	187	else
	188	return NULL;
	189	}
	190
	191	static long osd_uld_ioctl(struct file *file, unsigned int cmd,
	192	unsigned long arg)
	193	{
	194	struct osd_uld_device *oud = file->private_data;
	195	int ret;
	196	do_test_fn *do_test;
	197
	198	do_test = _find_ioctl(cmd);
	199	if (do_test)
	200	ret = do_test(&oud->od, cmd, arg);
	201	else {
	202	OSD_ERR("Unknown ioctl %d: osd_uld_device=%p\n", cmd, oud);
	203	ret = -ENOIOCTLCMD;
	204	}
	205	return ret;
	206	}
	207
	208	static const struct file_operations osd_fops = {
	209	.owner = THIS_MODULE,
	210	.open = osd_uld_open,
	211	.release = osd_uld_release,
	212	.unlocked_ioctl = osd_uld_ioctl,
6038f373	213	.llseek = noop_llseek,
95b05a7d BH	214	};
95b05a7d BH	215
e24977d4	216	struct osd_dev osduld_path_lookup(const char name)
b799bc7d	217	{
021e2230	218	struct osd_uld_device *oud;
d6ae4333	219	struct osd_dev_handle *odh;
021e2230	220	struct file *file;
b799bc7d BH	221	int error;
b799bc7d BH	222
e24977d4	223	if (!name \|\| !*name) {
b799bc7d BH	224	OSD_ERR("Mount with !path \|\| !*path\n");
	225	return ERR_PTR(-EINVAL);
	226	}
	227
d6ae4333 BH	228	odh = kzalloc(sizeof(*odh), GFP_KERNEL);
d6ae4333 BH	229	if (unlikely(!odh))
021e2230	230	return ERR_PTR(-ENOMEM);
b799bc7d	231
021e2230 BH	232	file = filp_open(name, O_RDWR, 0);
	233	if (IS_ERR(file)) {
	234	error = PTR_ERR(file);
	235	goto free_od;
b799bc7d BH	236	}
b799bc7d BH	237
021e2230 BH	238	if (file->f_op != &osd_fops){
	239	error = -EINVAL;
	240	goto close_file;
b799bc7d BH	241	}
b799bc7d BH	242
021e2230	243	oud = file->private_data;
b799bc7d	244
d6ae4333 BH	245	odh->od = oud->od;
	246	odh->file = file;
	247	odh->oud = oud;
b799bc7d	248
d6ae4333	249	return &odh->od;
b799bc7d	250
021e2230 BH	251	close_file:
	252	fput(file);
	253	free_od:
d6ae4333	254	kfree(odh);
021e2230	255	return ERR_PTR(error);
b799bc7d BH	256	}
	257	EXPORT_SYMBOL(osduld_path_lookup);
	258
2cdd6410 BH	259	static inline bool _the_same_or_null(const u8 *a1, unsigned a1_len,
	260	const u8 *a2, unsigned a2_len)
	261	{
	262	if (!a2_len) /* User string is Empty means don't care */
	263	return true;
	264
	265	if (a1_len != a2_len)
	266	return false;
	267
	268	return 0 == memcmp(a1, a2, a1_len);
	269	}
	270
	271	struct find_oud_t {
	272	const struct osd_dev_info *odi;
	273	struct device *dev;
	274	struct osd_uld_device *oud;
	275	} ;
	276
	277	int _mach_odi(struct device dev, void find_data)
	278	{
	279	struct osd_uld_device *oud = container_of(dev, struct osd_uld_device,
	280	class_dev);
	281	struct find_oud_t *fot = find_data;
	282	const struct osd_dev_info *odi = fot->odi;
	283
	284	if (_the_same_or_null(oud->odi.systemid, oud->odi.systemid_len,
	285	odi->systemid, odi->systemid_len) &&
	286	_the_same_or_null(oud->odi.osdname, oud->odi.osdname_len,
	287	odi->osdname, odi->osdname_len)) {
	288	OSD_DEBUG("found device sysid_len=%d osdname=%d\n",
	289	odi->systemid_len, odi->osdname_len);
	290	fot->oud = oud;
	291	return 1;
	292	} else {
	293	return 0;
	294	}
	295	}
	296
	297	/* osduld_info_lookup - Loop through all devices, return the requested osd_dev.
	298	*
	299	* if @odi->systemid_len and/or @odi->osdname_len are zero, they act as a don't
	300	* care. .e.g if they're both zero /dev/osd0 is returned.
	301	*/
	302	struct osd_dev osduld_info_lookup(const struct osd_dev_info odi)
	303	{
	304	struct find_oud_t find = {.odi = odi};
	305
	306	find.dev = class_find_device(&osd_uld_class, NULL, &find, _mach_odi);
	307	if (likely(find.dev)) {
	308	struct osd_dev_handle odh = kzalloc(sizeof(odh), GFP_KERNEL);
	309
	310	if (unlikely(!odh)) {
	311	put_device(find.dev);
	312	return ERR_PTR(-ENOMEM);
	313	}
	314
	315	odh->od = find.oud->od;
	316	odh->oud = find.oud;
	317
	318	return &odh->od;
	319	}
	320
	321	return ERR_PTR(-ENODEV);
	322	}
323	EXPORT_SYMBOL(osduld_info_lookup);
324
b799bc7d BH	325	void osduld_put_device(struct osd_dev *od)
b799bc7d BH	326	{
021e2230	327	if (od && !IS_ERR(od)) {
d6ae4333 BH	328	struct osd_dev_handle *odh =
	329	container_of(od, struct osd_dev_handle, od);
	330	struct osd_uld_device *oud = odh->oud;
021e2230 BH	331
	332	BUG_ON(od->scsi_device != oud->od.scsi_device);
	333
89f5e1f2 BH	334	/* If scsi has released the device (logout), and exofs has last
	335	* reference on oud it will be freed by above osd_uld_release
	336	* within fput below. But this will oops in cdev_release which
d6ae4333	337	* is called after the fops->release. A get_/put_ pair makes
89f5e1f2 BH	338	* sure we have a cdev for the duration of fput
89f5e1f2 BH	339	*/
2cdd6410 BH	340	if (odh->file) {
	341	get_device(&oud->class_dev);
	342	fput(odh->file);
	343	}
d6ae4333 BH	344	put_device(&oud->class_dev);
d6ae4333 BH	345	kfree(odh);
b799bc7d BH	346	}
	347	}
	348	EXPORT_SYMBOL(osduld_put_device);
	349
2cdd6410 BH	350	const struct osd_dev_info osduld_device_info(struct osd_dev od)
	351	{
	352	struct osd_dev_handle *odh =
	353	container_of(od, struct osd_dev_handle, od);
	354	return &odh->oud->odi;
	355	}
	356	EXPORT_SYMBOL(osduld_device_info);
	357
	358	bool osduld_device_same(struct osd_dev od, const struct osd_dev_info odi)
	359	{
	360	struct osd_dev_handle *odh =
	361	container_of(od, struct osd_dev_handle, od);
	362	struct osd_uld_device *oud = odh->oud;
	363
	364	return (oud->odi.systemid_len == odi->systemid_len) &&
	365	_the_same_or_null(oud->odi.systemid, oud->odi.systemid_len,
	366	odi->systemid, odi->systemid_len) &&
	367	(oud->odi.osdname_len == odi->osdname_len) &&
	368	_the_same_or_null(oud->odi.osdname, oud->odi.osdname_len,
	369	odi->osdname, odi->osdname_len);
	370	}
	371	EXPORT_SYMBOL(osduld_device_same);
	372
95b05a7d BH	373	/*
	374	* Scsi Device operations
	375	*/
	376
	377	static int __detect_osd(struct osd_uld_device *oud)
	378	{
	379	struct scsi_device *scsi_device = oud->od.scsi_device;
1b9dce94	380	char caps[OSD_CAP_LEN];
95b05a7d BH	381	int error;
	382
	383	/* sending a test_unit_ready as first command seems to be needed
	384	* by some targets
	385	*/
	386	OSD_DEBUG("start scsi_test_unit_ready %p %p %p\n",
	387	oud, scsi_device, scsi_device->request_queue);
	388	error = scsi_test_unit_ready(scsi_device, 10*HZ, 5, NULL);
	389	if (error)
	390	OSD_ERR("warning: scsi_test_unit_ready failed\n");
	391
1b9dce94	392	osd_sec_init_nosec_doall_caps(caps, &osd_root_object, false, true);
2cdd6410	393	if (osd_auto_detect_ver(&oud->od, caps, &oud->odi))
1b9dce94 BH	394	return -ENODEV;
1b9dce94 BH	395
95b05a7d BH	396	return 0;
	397	}
	398
d6ae4333 BH	399	static void __remove(struct device *dev)
	400	{
	401	struct osd_uld_device *oud = container_of(dev, struct osd_uld_device,
	402	class_dev);
	403	struct scsi_device *scsi_device = oud->od.scsi_device;
	404
2cdd6410 BH	405	kfree(oud->odi.osdname);
2cdd6410 BH	406
d6ae4333 BH	407	if (oud->cdev.owner)
	408	cdev_del(&oud->cdev);
	409
	410	osd_dev_fini(&oud->od);
	411	scsi_device_put(scsi_device);
	412
	413	OSD_INFO("osd_remove %s\n",
	414	oud->disk ? oud->disk->disk_name : NULL);
	415
	416	if (oud->disk)
	417	put_disk(oud->disk);
	418	ida_remove(&osd_minor_ida, oud->minor);
	419
	420	kfree(oud);
	421	}
95b05a7d BH	422
	423	static int osd_probe(struct device *dev)
	424	{
	425	struct scsi_device *scsi_device = to_scsi_device(dev);
	426	struct gendisk *disk;
	427	struct osd_uld_device *oud;
	428	int minor;
	429	int error;
	430
	431	if (scsi_device->type != TYPE_OSD)
	432	return -ENODEV;
	433
	434	do {
	435	if (!ida_pre_get(&osd_minor_ida, GFP_KERNEL))
	436	return -ENODEV;
	437
	438	error = ida_get_new(&osd_minor_ida, &minor);
	439	} while (error == -EAGAIN);
	440
	441	if (error)
	442	return error;
	443	if (minor >= SCSI_OSD_MAX_MINOR) {
	444	error = -EBUSY;
	445	goto err_retract_minor;
	446	}
	447
	448	error = -ENOMEM;
	449	oud = kzalloc(sizeof(*oud), GFP_KERNEL);
	450	if (NULL == oud)
	451	goto err_retract_minor;
	452
95b05a7d BH	453	dev_set_drvdata(dev, oud);
	454	oud->minor = minor;
	455
	456	/* allocate a disk and set it up */
	457	/* FIXME: do we need this since sg has already done that */
	458	disk = alloc_disk(1);
	459	if (!disk) {
	460	OSD_ERR("alloc_disk failed\n");
	461	goto err_free_osd;
	462	}
	463	disk->major = SCSI_OSD_MAJOR;
	464	disk->first_minor = oud->minor;
	465	sprintf(disk->disk_name, "osd%d", oud->minor);
	466	oud->disk = disk;
	467
	468	/* hold one more reference to the scsi_device that will get released
	469	* in __release, in case a logout is happening while fs is mounted
	470	*/
	471	scsi_device_get(scsi_device);
	472	osd_dev_init(&oud->od, scsi_device);
	473
	474	/* Detect the OSD Version */
	475	error = __detect_osd(oud);
	476	if (error) {
	477	OSD_ERR("osd detection failed, non-compatible OSD device\n");
	478	goto err_put_disk;
	479	}
	480
	481	/* init the char-device for communication with user-mode */
	482	cdev_init(&oud->cdev, &osd_fops);
	483	oud->cdev.owner = THIS_MODULE;
	484	error = cdev_add(&oud->cdev,
	485	MKDEV(SCSI_OSD_MAJOR, oud->minor), 1);
	486	if (error) {
	487	OSD_ERR("cdev_add failed\n");
	488	goto err_put_disk;
	489	}
d6ae4333 BH	490
	491	/* class device member */
	492	oud->class_dev.devt = oud->cdev.dev;
	493	oud->class_dev.class = &osd_uld_class;
	494	oud->class_dev.parent = dev;
	495	oud->class_dev.release = __remove;
	496	error = dev_set_name(&oud->class_dev, disk->disk_name);
	497	if (error) {
	498	OSD_ERR("dev_set_name failed => %d\n", error);
95b05a7d BH	499	goto err_put_cdev;
	500	}
	501
d6ae4333 BH	502	error = device_register(&oud->class_dev);
	503	if (error) {
	504	OSD_ERR("device_register failed => %d\n", error);
	505	goto err_put_cdev;
	506	}
	507
	508	get_device(&oud->class_dev);
95b05a7d BH	509
	510	OSD_INFO("osd_probe %s\n", disk->disk_name);
	511	return 0;
	512
	513	err_put_cdev:
	514	cdev_del(&oud->cdev);
	515	err_put_disk:
	516	scsi_device_put(scsi_device);
	517	put_disk(disk);
	518	err_free_osd:
	519	dev_set_drvdata(dev, NULL);
	520	kfree(oud);
	521	err_retract_minor:
	522	ida_remove(&osd_minor_ida, minor);
	523	return error;
	524	}
	525
	526	static int osd_remove(struct device *dev)
	527	{
	528	struct scsi_device *scsi_device = to_scsi_device(dev);
	529	struct osd_uld_device *oud = dev_get_drvdata(dev);
	530
	531	if (!oud \|\| (oud->od.scsi_device != scsi_device)) {
	532	OSD_ERR("Half cooked osd-device %p,%p \|\| %p!=%p",
	533	dev, oud, oud ? oud->od.scsi_device : NULL,
	534	scsi_device);
	535	}
	536
d6ae4333	537	device_unregister(&oud->class_dev);
95b05a7d	538
d6ae4333	539	put_device(&oud->class_dev);
95b05a7d BH	540	return 0;
	541	}
	542
95b05a7d BH	543	/*
	544	* Global driver and scsi registration
	545	*/
	546
	547	static struct scsi_driver osd_driver = {
	548	.owner = THIS_MODULE,
	549	.gendrv = {
	550	.name = osd_name,
	551	.probe = osd_probe,
	552	.remove = osd_remove,
	553	}
	554	};
	555
	556	static int __init osd_uld_init(void)
	557	{
	558	int err;
	559
d6ae4333 BH	560	err = class_register(&osd_uld_class);
	561	if (err) {
	562	OSD_ERR("Unable to register sysfs class => %d\n", err);
	563	return err;
95b05a7d BH	564	}
	565
	566	err = register_chrdev_region(MKDEV(SCSI_OSD_MAJOR, 0),
	567	SCSI_OSD_MAX_MINOR, osd_name);
	568	if (err) {
	569	OSD_ERR("Unable to register major %d for osd ULD => %d\n",
	570	SCSI_OSD_MAJOR, err);
	571	goto err_out;
	572	}
	573
	574	err = scsi_register_driver(&osd_driver.gendrv);
	575	if (err) {
	576	OSD_ERR("scsi_register_driver failed => %d\n", err);
	577	goto err_out_chrdev;
	578	}
	579
	580	OSD_INFO("LOADED %s\n", osd_version_string);
	581	return 0;
	582
	583	err_out_chrdev:
	584	unregister_chrdev_region(MKDEV(SCSI_OSD_MAJOR, 0), SCSI_OSD_MAX_MINOR);
	585	err_out:
d6ae4333	586	class_unregister(&osd_uld_class);
95b05a7d BH	587	return err;
	588	}
	589
	590	static void __exit osd_uld_exit(void)
	591	{
	592	scsi_unregister_driver(&osd_driver.gendrv);
	593	unregister_chrdev_region(MKDEV(SCSI_OSD_MAJOR, 0), SCSI_OSD_MAX_MINOR);
d6ae4333	594	class_unregister(&osd_uld_class);
95b05a7d BH	595	OSD_INFO("UNLOADED %s\n", osd_version_string);
	596	}
	597
	598	module_init(osd_uld_init);
	599	module_exit(osd_uld_exit);