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[PATCH] add sysfs support for ide tape

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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>
This commit is contained in:
Will Dyson 2005-09-16 02:55:07 -07:00 committed by Greg Kroah-Hartman
parent 3dc7c55563
commit d5dee80ad6
1 changed files with 36 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

38
drivers/ide/ide-tape.c
View file

@ -1013,6 +1013,8 @@ typedef struct ide_tape_obj {
static DECLARE_MUTEX(idetape_ref_sem); static DECLARE_MUTEX(idetape_ref_sem);
static struct class *idetape_sysfs_class;
#define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref) #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref)
#define ide_tape_g(disk) \ #define ide_tape_g(disk) \
@ -4704,6 +4706,10 @@ static void ide_tape_release(struct kref *kref)
drive->dsc_overlap = 0; drive->dsc_overlap = 0;
drive->driver_data = NULL; drive->driver_data = NULL;
class_device_destroy(idetape_sysfs_class,
MKDEV(IDETAPE_MAJOR, tape->minor));
class_device_destroy(idetape_sysfs_class,
MKDEV(IDETAPE_MAJOR, tape->minor + 128));
devfs_remove("%s/mt", drive->devfs_name); devfs_remove("%s/mt", drive->devfs_name);
devfs_remove("%s/mtn", drive->devfs_name); devfs_remove("%s/mtn", drive->devfs_name);
devfs_unregister_tape(g->number); devfs_unregister_tape(g->number);
@ -4878,6 +4884,11 @@ static int ide_tape_probe(struct device *dev)
idetape_setup(drive, tape, minor); idetape_setup(drive, tape, minor);
class_device_create(idetape_sysfs_class,
MKDEV(IDETAPE_MAJOR, minor), dev, "%s", tape->name);
class_device_create(idetape_sysfs_class,
MKDEV(IDETAPE_MAJOR, minor + 128), dev, "n%s", tape->name);
devfs_mk_cdev(MKDEV(HWIF(drive)->major, minor), devfs_mk_cdev(MKDEV(HWIF(drive)->major, minor),
S_IFCHR | S_IRUGO | S_IWUGO, S_IFCHR | S_IRUGO | S_IWUGO,
"%s/mt", drive->devfs_name); "%s/mt", drive->devfs_name);
@ -4903,6 +4914,7 @@ MODULE_LICENSE("GPL");
static void __exit idetape_exit (void) static void __exit idetape_exit (void)
{ {
driver_unregister(&idetape_driver.gen_driver); driver_unregister(&idetape_driver.gen_driver);
class_destroy(idetape_sysfs_class);
unregister_chrdev(IDETAPE_MAJOR, "ht"); unregister_chrdev(IDETAPE_MAJOR, "ht");
} }
@ -4911,11 +4923,33 @@ static void __exit idetape_exit (void)
*/ */
static int idetape_init (void) static int idetape_init (void)
{ {
int error = 1;
idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
if (IS_ERR(idetape_sysfs_class)) {
idetape_sysfs_class = NULL;
printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
error = -EBUSY;
goto out;
}
if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
printk(KERN_ERR "ide-tape: Failed to register character device interface\n"); printk(KERN_ERR "ide-tape: Failed to register character device interface\n");
return -EBUSY; error = -EBUSY;
goto out_free_class;
} }
return driver_register(&idetape_driver.gen_driver);
error = driver_register(&idetape_driver.gen_driver);
if (error)
goto out_free_driver;
return 0;
out_free_driver:
driver_unregister(&idetape_driver.gen_driver);
out_free_class:
class_destroy(idetape_sysfs_class);
out:
return error;
} }
module_init(idetape_init); module_init(idetape_init);