mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-21 00:42:16 +00:00
[SCSI] osd_uld: OSD scsi ULD
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. Signed-off-by: Boaz Harrosh <bharrosh@panasas.com> Reviewed-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Boaz Harrosh
James Bottomley
parent
02941a530e
commit
95b05a7db5
@ -17,6 +17,9 @@ ifneq ($(OSD_INC),)
|
||||
CONFIG_SCSI_OSD_INITIATOR=m
|
||||
ccflags-y += -DCONFIG_SCSI_OSD_INITIATOR -DCONFIG_SCSI_OSD_INITIATOR_MODULE
|
||||
|
||||
CONFIG_SCSI_OSD_ULD=m
|
||||
ccflags-y += -DCONFIG_SCSI_OSD_ULD -DCONFIG_SCSI_OSD_ULD_MODULE
|
||||
|
||||
# Uncomment to turn debug on
|
||||
# ccflags-y += -DCONFIG_SCSI_OSD_DEBUG
|
||||
|
||||
@ -30,3 +33,7 @@ endif
|
||||
# libosd.ko - osd-initiator library
|
||||
libosd-y := osd_initiator.o
|
||||
obj-$(CONFIG_SCSI_OSD_INITIATOR) += libosd.o
|
||||
|
||||
# osd.ko - SCSI ULD and char-device
|
||||
osd-y := osd_uld.o
|
||||
obj-$(CONFIG_SCSI_OSD_ULD) += osd.o
|
||||
|
||||
419
drivers/scsi/osd/osd_uld.c
Normal file
419
drivers/scsi/osd/osd_uld.c
Normal file
@ -0,0 +1,419 @@
|
||||
/*
|
||||
* 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 <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 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;
|
||||
}
|
||||
|
||||
/* 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,
|
||||
};
|
||||
|
||||
/*
|
||||
* Scsi Device operations
|
||||
*/
|
||||
|
||||
static int __detect_osd(struct osd_uld_device *oud)
|
||||
{
|
||||
struct scsi_device *scsi_device = oud->od.scsi_device;
|
||||
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");
|
||||
|
||||
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_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;
|
||||
|
||||
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_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;
|
||||
}
|
||||
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_device->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_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);
|
||||
}
|
||||
|
||||
sysfs_remove_link(&oud->od.scsi_device->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_device = oud->od.scsi_device;
|
||||
|
||||
/* now let delete the char_dev */
|
||||
kobject_put(&oud->cdev.kobj);
|
||||
|
||||
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 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);
|
||||
@ -33,6 +33,12 @@ struct osd_dev {
|
||||
unsigned def_timeout;
|
||||
};
|
||||
|
||||
/* Add/remove test ioctls from external modules */
|
||||
typedef int (do_test_fn)(struct osd_dev *od, unsigned cmd, unsigned long arg);
|
||||
int osduld_register_test(unsigned ioctl, do_test_fn *do_test);
|
||||
void osduld_unregister_test(unsigned ioctl);
|
||||
|
||||
/* These are called by uld at probe time */
|
||||
void osd_dev_init(struct osd_dev *od, struct scsi_device *scsi_device);
|
||||
void osd_dev_fini(struct osd_dev *od);
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user