[PATCH] add sysfs support for ide tape
I was recently given an old Travan tape drive and asked to do something useful with it. The ide-scsi + st (+serverworks ide controller) combo results in a hard lockup of the machine which I have not had the energy to debug, so I turned to ide-tape (which seems to work). The system in question debian stable, using udev to manage /dev. The following patch to ide-tape.c allows udev to create the cdev nodes for my drive. Cc: Gadi Oxman <gadio@netvision.net.il> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -1013,6 +1013,8 @@ typedef struct ide_tape_obj {
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static DECLARE_MUTEX(idetape_ref_sem);
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static struct class *idetape_sysfs_class;
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#define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref)
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#define ide_tape_g(disk) \
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@ -4704,6 +4706,10 @@ static void ide_tape_release(struct kref *kref)
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drive->dsc_overlap = 0;
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drive->driver_data = NULL;
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class_device_destroy(idetape_sysfs_class,
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MKDEV(IDETAPE_MAJOR, tape->minor));
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class_device_destroy(idetape_sysfs_class,
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MKDEV(IDETAPE_MAJOR, tape->minor + 128));
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devfs_remove("%s/mt", drive->devfs_name);
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devfs_remove("%s/mtn", drive->devfs_name);
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devfs_unregister_tape(g->number);
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@ -4878,6 +4884,11 @@ static int ide_tape_probe(struct device *dev)
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idetape_setup(drive, tape, minor);
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class_device_create(idetape_sysfs_class,
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MKDEV(IDETAPE_MAJOR, minor), dev, "%s", tape->name);
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class_device_create(idetape_sysfs_class,
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MKDEV(IDETAPE_MAJOR, minor + 128), dev, "n%s", tape->name);
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devfs_mk_cdev(MKDEV(HWIF(drive)->major, minor),
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S_IFCHR | S_IRUGO | S_IWUGO,
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"%s/mt", drive->devfs_name);
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@ -4903,6 +4914,7 @@ MODULE_LICENSE("GPL");
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static void __exit idetape_exit (void)
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{
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driver_unregister(&idetape_driver.gen_driver);
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class_destroy(idetape_sysfs_class);
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unregister_chrdev(IDETAPE_MAJOR, "ht");
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}
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@ -4911,11 +4923,33 @@ static void __exit idetape_exit (void)
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*/
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static int idetape_init (void)
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{
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int error = 1;
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idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
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if (IS_ERR(idetape_sysfs_class)) {
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idetape_sysfs_class = NULL;
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printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
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error = -EBUSY;
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goto out;
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}
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if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
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printk(KERN_ERR "ide-tape: Failed to register character device interface\n");
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return -EBUSY;
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error = -EBUSY;
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goto out_free_class;
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}
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return driver_register(&idetape_driver.gen_driver);
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error = driver_register(&idetape_driver.gen_driver);
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if (error)
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goto out_free_driver;
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return 0;
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out_free_driver:
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driver_unregister(&idetape_driver.gen_driver);
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out_free_class:
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class_destroy(idetape_sysfs_class);
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out:
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return error;
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}
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module_init(idetape_init);
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