2 * osd_uld.c - OSD Upper Layer Driver
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
10 * Copyright (C) 2008 Panasas Inc. All rights reserved.
13 * Boaz Harrosh <bharrosh@panasas.com>
14 * Benny Halevy <bhalevy@panasas.com>
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
19 * Redistribution and use in source and binary forms, with or without
20 * modification, are permitted provided that the following conditions
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.
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.
45 #include <linux/namei.h>
46 #include <linux/cdev.h>
48 #include <linux/module.h>
49 #include <linux/device.h>
50 #include <linux/idr.h>
51 #include <linux/major.h>
52 #include <linux/file.h>
54 #include <scsi/scsi.h>
55 #include <scsi/scsi_driver.h>
56 #include <scsi/scsi_device.h>
57 #include <scsi/scsi_ioctl.h>
59 #include <scsi/osd_initiator.h>
60 #include <scsi/osd_sec.h>
62 #include "osd_debug.h"
65 # define TYPE_OSD 0x11
68 #ifndef SCSI_OSD_MAJOR
69 # define SCSI_OSD_MAJOR 260
71 #define SCSI_OSD_MAX_MINOR 64
73 static const char osd_name[] = "osd";
74 static const char *osd_version_string = "open-osd 0.2.0";
76 MODULE_AUTHOR("Boaz Harrosh <bharrosh@panasas.com>");
77 MODULE_DESCRIPTION("open-osd Upper-Layer-Driver osd.ko");
78 MODULE_LICENSE("GPL");
79 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_OSD_MAJOR);
80 MODULE_ALIAS_SCSI_DEVICE(TYPE_OSD);
82 struct osd_uld_device {
84 struct device class_dev;
90 struct osd_dev_handle {
93 struct osd_uld_device *oud;
96 static DEFINE_IDA(osd_minor_ida);
98 static struct class osd_uld_class = {
104 * Char Device operations
107 static int osd_uld_open(struct inode *inode, struct file *file)
109 struct osd_uld_device *oud = container_of(inode->i_cdev,
110 struct osd_uld_device, cdev);
112 get_device(&oud->class_dev);
113 /* cache osd_uld_device on file handle */
114 file->private_data = oud;
115 OSD_DEBUG("osd_uld_open %p\n", oud);
119 static int osd_uld_release(struct inode *inode, struct file *file)
121 struct osd_uld_device *oud = file->private_data;
123 OSD_DEBUG("osd_uld_release %p\n", file->private_data);
124 file->private_data = NULL;
125 put_device(&oud->class_dev);
129 /* FIXME: Only one vector for now */
130 unsigned g_test_ioctl;
131 do_test_fn *g_do_test;
133 int osduld_register_test(unsigned ioctl, do_test_fn *do_test)
138 g_test_ioctl = ioctl;
142 EXPORT_SYMBOL(osduld_register_test);
144 void osduld_unregister_test(unsigned ioctl)
146 if (ioctl == g_test_ioctl) {
151 EXPORT_SYMBOL(osduld_unregister_test);
153 static do_test_fn *_find_ioctl(unsigned cmd)
155 if (g_test_ioctl == cmd)
161 static long osd_uld_ioctl(struct file *file, unsigned int cmd,
164 struct osd_uld_device *oud = file->private_data;
168 do_test = _find_ioctl(cmd);
170 ret = do_test(&oud->od, cmd, arg);
172 OSD_ERR("Unknown ioctl %d: osd_uld_device=%p\n", cmd, oud);
178 static const struct file_operations osd_fops = {
179 .owner = THIS_MODULE,
180 .open = osd_uld_open,
181 .release = osd_uld_release,
182 .unlocked_ioctl = osd_uld_ioctl,
185 struct osd_dev *osduld_path_lookup(const char *name)
187 struct osd_uld_device *oud;
188 struct osd_dev_handle *odh;
192 if (!name || !*name) {
193 OSD_ERR("Mount with !path || !*path\n");
194 return ERR_PTR(-EINVAL);
197 odh = kzalloc(sizeof(*odh), GFP_KERNEL);
199 return ERR_PTR(-ENOMEM);
201 file = filp_open(name, O_RDWR, 0);
203 error = PTR_ERR(file);
207 if (file->f_op != &osd_fops){
212 oud = file->private_data;
224 return ERR_PTR(error);
226 EXPORT_SYMBOL(osduld_path_lookup);
228 void osduld_put_device(struct osd_dev *od)
230 if (od && !IS_ERR(od)) {
231 struct osd_dev_handle *odh =
232 container_of(od, struct osd_dev_handle, od);
233 struct osd_uld_device *oud = odh->oud;
235 BUG_ON(od->scsi_device != oud->od.scsi_device);
237 /* If scsi has released the device (logout), and exofs has last
238 * reference on oud it will be freed by above osd_uld_release
239 * within fput below. But this will oops in cdev_release which
240 * is called after the fops->release. A get_/put_ pair makes
241 * sure we have a cdev for the duration of fput
243 get_device(&oud->class_dev);
245 put_device(&oud->class_dev);
249 EXPORT_SYMBOL(osduld_put_device);
252 * Scsi Device operations
255 static int __detect_osd(struct osd_uld_device *oud)
257 struct scsi_device *scsi_device = oud->od.scsi_device;
258 char caps[OSD_CAP_LEN];
261 /* sending a test_unit_ready as first command seems to be needed
264 OSD_DEBUG("start scsi_test_unit_ready %p %p %p\n",
265 oud, scsi_device, scsi_device->request_queue);
266 error = scsi_test_unit_ready(scsi_device, 10*HZ, 5, NULL);
268 OSD_ERR("warning: scsi_test_unit_ready failed\n");
270 osd_sec_init_nosec_doall_caps(caps, &osd_root_object, false, true);
271 if (osd_auto_detect_ver(&oud->od, caps))
277 static void __remove(struct device *dev)
279 struct osd_uld_device *oud = container_of(dev, struct osd_uld_device,
281 struct scsi_device *scsi_device = oud->od.scsi_device;
284 cdev_del(&oud->cdev);
286 osd_dev_fini(&oud->od);
287 scsi_device_put(scsi_device);
289 OSD_INFO("osd_remove %s\n",
290 oud->disk ? oud->disk->disk_name : NULL);
294 ida_remove(&osd_minor_ida, oud->minor);
299 static int osd_probe(struct device *dev)
301 struct scsi_device *scsi_device = to_scsi_device(dev);
302 struct gendisk *disk;
303 struct osd_uld_device *oud;
307 if (scsi_device->type != TYPE_OSD)
311 if (!ida_pre_get(&osd_minor_ida, GFP_KERNEL))
314 error = ida_get_new(&osd_minor_ida, &minor);
315 } while (error == -EAGAIN);
319 if (minor >= SCSI_OSD_MAX_MINOR) {
321 goto err_retract_minor;
325 oud = kzalloc(sizeof(*oud), GFP_KERNEL);
327 goto err_retract_minor;
329 dev_set_drvdata(dev, oud);
332 /* allocate a disk and set it up */
333 /* FIXME: do we need this since sg has already done that */
334 disk = alloc_disk(1);
336 OSD_ERR("alloc_disk failed\n");
339 disk->major = SCSI_OSD_MAJOR;
340 disk->first_minor = oud->minor;
341 sprintf(disk->disk_name, "osd%d", oud->minor);
344 /* hold one more reference to the scsi_device that will get released
345 * in __release, in case a logout is happening while fs is mounted
347 scsi_device_get(scsi_device);
348 osd_dev_init(&oud->od, scsi_device);
350 /* Detect the OSD Version */
351 error = __detect_osd(oud);
353 OSD_ERR("osd detection failed, non-compatible OSD device\n");
357 /* init the char-device for communication with user-mode */
358 cdev_init(&oud->cdev, &osd_fops);
359 oud->cdev.owner = THIS_MODULE;
360 error = cdev_add(&oud->cdev,
361 MKDEV(SCSI_OSD_MAJOR, oud->minor), 1);
363 OSD_ERR("cdev_add failed\n");
367 /* class device member */
368 oud->class_dev.devt = oud->cdev.dev;
369 oud->class_dev.class = &osd_uld_class;
370 oud->class_dev.parent = dev;
371 oud->class_dev.release = __remove;
372 error = dev_set_name(&oud->class_dev, disk->disk_name);
374 OSD_ERR("dev_set_name failed => %d\n", error);
378 error = device_register(&oud->class_dev);
380 OSD_ERR("device_register failed => %d\n", error);
384 get_device(&oud->class_dev);
386 OSD_INFO("osd_probe %s\n", disk->disk_name);
390 cdev_del(&oud->cdev);
392 scsi_device_put(scsi_device);
395 dev_set_drvdata(dev, NULL);
398 ida_remove(&osd_minor_ida, minor);
402 static int osd_remove(struct device *dev)
404 struct scsi_device *scsi_device = to_scsi_device(dev);
405 struct osd_uld_device *oud = dev_get_drvdata(dev);
407 if (!oud || (oud->od.scsi_device != scsi_device)) {
408 OSD_ERR("Half cooked osd-device %p,%p || %p!=%p",
409 dev, oud, oud ? oud->od.scsi_device : NULL,
413 device_unregister(&oud->class_dev);
415 put_device(&oud->class_dev);
420 * Global driver and scsi registration
423 static struct scsi_driver osd_driver = {
424 .owner = THIS_MODULE,
428 .remove = osd_remove,
432 static int __init osd_uld_init(void)
436 err = class_register(&osd_uld_class);
438 OSD_ERR("Unable to register sysfs class => %d\n", err);
442 err = register_chrdev_region(MKDEV(SCSI_OSD_MAJOR, 0),
443 SCSI_OSD_MAX_MINOR, osd_name);
445 OSD_ERR("Unable to register major %d for osd ULD => %d\n",
446 SCSI_OSD_MAJOR, err);
450 err = scsi_register_driver(&osd_driver.gendrv);
452 OSD_ERR("scsi_register_driver failed => %d\n", err);
456 OSD_INFO("LOADED %s\n", osd_version_string);
460 unregister_chrdev_region(MKDEV(SCSI_OSD_MAJOR, 0), SCSI_OSD_MAX_MINOR);
462 class_unregister(&osd_uld_class);
466 static void __exit osd_uld_exit(void)
468 scsi_unregister_driver(&osd_driver.gendrv);
469 unregister_chrdev_region(MKDEV(SCSI_OSD_MAJOR, 0), SCSI_OSD_MAX_MINOR);
470 class_unregister(&osd_uld_class);
471 OSD_INFO("UNLOADED %s\n", osd_version_string);
474 module_init(osd_uld_init);
475 module_exit(osd_uld_exit);