2 * File...........: linux/drivers/s390/block/dasd_ioctl.c
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4 * Horst Hummel <Horst.Hummel@de.ibm.com>
5 * Carsten Otte <Cotte@de.ibm.com>
6 * Martin Schwidefsky <schwidefsky@de.ibm.com>
7 * Bugreports.to..: <Linux390@de.ibm.com>
8 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001
12 * i/o controls for the dasd driver.
14 #include <linux/config.h>
15 #include <linux/interrupt.h>
16 #include <linux/major.h>
18 #include <linux/blkpg.h>
20 #include <asm/ccwdev.h>
21 #include <asm/uaccess.h>
24 #define PRINTK_HEADER "dasd_ioctl:"
29 * SECTION: ioctl functions.
31 static struct list_head dasd_ioctl_list = LIST_HEAD_INIT(dasd_ioctl_list);
34 * Find the ioctl with number no.
36 static struct dasd_ioctl *
37 dasd_find_ioctl(int no)
39 struct dasd_ioctl *ioctl;
41 list_for_each_entry (ioctl, &dasd_ioctl_list, list)
48 * Register ioctl with number no.
51 dasd_ioctl_no_register(struct module *owner, int no, dasd_ioctl_fn_t handler)
53 struct dasd_ioctl *new;
54 if (dasd_find_ioctl(no))
56 new = kmalloc(sizeof (struct dasd_ioctl), GFP_KERNEL);
61 new->handler = handler;
62 list_add(&new->list, &dasd_ioctl_list);
67 * Deregister ioctl with number no.
70 dasd_ioctl_no_unregister(struct module *owner, int no, dasd_ioctl_fn_t handler)
72 struct dasd_ioctl *old = dasd_find_ioctl(no);
75 if (old->no != no || old->handler != handler || owner != old->owner)
83 dasd_ioctl(struct inode *inp, struct file *filp,
84 unsigned int no, unsigned long data)
86 struct block_device *bdev = inp->i_bdev;
87 struct dasd_device *device = bdev->bd_disk->private_data;
88 struct dasd_ioctl *ioctl;
92 if ((_IOC_DIR(no) != _IOC_NONE) && (data == 0)) {
93 PRINT_DEBUG("empty data ptr");
96 dir = _IOC_DIR (no) == _IOC_NONE ? "0" :
97 _IOC_DIR (no) == _IOC_READ ? "r" :
98 _IOC_DIR (no) == _IOC_WRITE ? "w" :
99 _IOC_DIR (no) == (_IOC_READ | _IOC_WRITE) ? "rw" : "u";
100 DBF_DEV_EVENT(DBF_DEBUG, device,
101 "ioctl 0x%08x %s'0x%x'%d(%d) with data %8lx", no,
102 dir, _IOC_TYPE(no), _IOC_NR(no), _IOC_SIZE(no), data);
103 /* Search for ioctl no in the ioctl list. */
104 list_for_each_entry(ioctl, &dasd_ioctl_list, list) {
105 if (ioctl->no == no) {
106 /* Found a matching ioctl. Call it. */
107 if (!try_module_get(ioctl->owner))
109 rc = ioctl->handler(bdev, no, data);
110 module_put(ioctl->owner);
114 /* No ioctl with number no. */
115 DBF_DEV_EVENT(DBF_INFO, device,
116 "unknown ioctl 0x%08x=%s'0x%x'%d(%d) data %8lx", no,
117 dir, _IOC_TYPE(no), _IOC_NR(no), _IOC_SIZE(no), data);
122 dasd_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
127 rval = dasd_ioctl(filp->f_dentry->d_inode, filp, cmd, arg);
130 return (rval == -EINVAL) ? -ENOIOCTLCMD : rval;
134 dasd_ioctl_api_version(struct block_device *bdev, int no, long args)
136 int ver = DASD_API_VERSION;
137 return put_user(ver, (int __user *) args);
142 * used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection
145 dasd_ioctl_enable(struct block_device *bdev, int no, long args)
147 struct dasd_device *device;
149 if (!capable(CAP_SYS_ADMIN))
151 device = bdev->bd_disk->private_data;
154 dasd_enable_device(device);
155 /* Formatting the dasd device can change the capacity. */
157 i_size_write(bdev->bd_inode, (loff_t)get_capacity(device->gdp) << 9);
164 * Used by dasdfmt. Disable I/O operations but allow ioctls.
167 dasd_ioctl_disable(struct block_device *bdev, int no, long args)
169 struct dasd_device *device;
171 if (!capable(CAP_SYS_ADMIN))
173 device = bdev->bd_disk->private_data;
177 * Man this is sick. We don't do a real disable but only downgrade
178 * the device to DASD_STATE_BASIC. The reason is that dasdfmt uses
179 * BIODASDDISABLE to disable accesses to the device via the block
180 * device layer but it still wants to do i/o on the device by
181 * using the BIODASDFMT ioctl. Therefore the correct state for the
182 * device is DASD_STATE_BASIC that allows to do basic i/o.
184 dasd_set_target_state(device, DASD_STATE_BASIC);
186 * Set i_size to zero, since read, write, etc. check against this
190 i_size_write(bdev->bd_inode, 0);
199 dasd_ioctl_quiesce(struct block_device *bdev, int no, long args)
201 struct dasd_device *device;
204 if (!capable (CAP_SYS_ADMIN))
207 device = bdev->bd_disk->private_data;
211 DEV_MESSAGE (KERN_DEBUG, device, "%s",
212 "Quiesce IO on device");
213 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
214 device->stopped |= DASD_STOPPED_QUIESCE;
215 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
224 dasd_ioctl_resume(struct block_device *bdev, int no, long args)
226 struct dasd_device *device;
229 if (!capable (CAP_SYS_ADMIN))
232 device = bdev->bd_disk->private_data;
236 DEV_MESSAGE (KERN_DEBUG, device, "%s",
237 "resume IO on device");
239 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
240 device->stopped &= ~DASD_STOPPED_QUIESCE;
241 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
243 dasd_schedule_bh (device);
248 * performs formatting of _device_ according to _fdata_
249 * Note: The discipline's format_function is assumed to deliver formatting
250 * commands to format a single unit of the device. In terms of the ECKD
251 * devices this means CCWs are generated to format a single track.
254 dasd_format(struct dasd_device * device, struct format_data_t * fdata)
256 struct dasd_ccw_req *cqr;
259 if (device->discipline->format_device == NULL)
262 if (device->state != DASD_STATE_BASIC) {
263 DEV_MESSAGE(KERN_WARNING, device, "%s",
264 "dasd_format: device is not disabled! ");
268 DBF_DEV_EVENT(DBF_NOTICE, device,
269 "formatting units %d to %d (%d B blocks) flags %d",
271 fdata->stop_unit, fdata->blksize, fdata->intensity);
273 /* Since dasdfmt keeps the device open after it was disabled,
274 * there still exists an inode for this device.
275 * We must update i_blkbits, otherwise we might get errors when
276 * enabling the device later.
278 if (fdata->start_unit == 0) {
279 struct block_device *bdev = bdget_disk(device->gdp, 0);
280 bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize);
284 while (fdata->start_unit <= fdata->stop_unit) {
285 cqr = device->discipline->format_device(device, fdata);
288 rc = dasd_sleep_on_interruptible(cqr);
289 dasd_sfree_request(cqr, cqr->device);
291 if (rc != -ERESTARTSYS)
292 DEV_MESSAGE(KERN_ERR, device,
293 " Formatting of unit %d failed "
295 fdata->start_unit, rc);
307 dasd_ioctl_format(struct block_device *bdev, int no, long args)
309 struct dasd_device *device;
310 struct format_data_t fdata;
312 if (!capable(CAP_SYS_ADMIN))
316 /* fdata == NULL is no longer a valid arg to dasd_format ! */
317 device = bdev->bd_disk->private_data;
322 if (device->features & DASD_FEATURE_READONLY)
324 if (copy_from_user(&fdata, (void __user *) args,
325 sizeof (struct format_data_t)))
327 if (bdev != bdev->bd_contains) {
328 DEV_MESSAGE(KERN_WARNING, device, "%s",
329 "Cannot low-level format a partition");
332 return dasd_format(device, &fdata);
335 #ifdef CONFIG_DASD_PROFILE
337 * Reset device profile information
340 dasd_ioctl_reset_profile(struct block_device *bdev, int no, long args)
342 struct dasd_device *device;
344 if (!capable(CAP_SYS_ADMIN))
347 device = bdev->bd_disk->private_data;
351 memset(&device->profile, 0, sizeof (struct dasd_profile_info_t));
356 * Return device profile information
359 dasd_ioctl_read_profile(struct block_device *bdev, int no, long args)
361 struct dasd_device *device;
363 device = bdev->bd_disk->private_data;
367 if (dasd_profile_level == DASD_PROFILE_OFF)
370 if (copy_to_user((long __user *) args, (long *) &device->profile,
371 sizeof (struct dasd_profile_info_t)))
377 dasd_ioctl_reset_profile(struct block_device *bdev, int no, long args)
383 dasd_ioctl_read_profile(struct block_device *bdev, int no, long args)
390 * Return dasd information. Used for BIODASDINFO and BIODASDINFO2.
393 dasd_ioctl_information(struct block_device *bdev, int no, long args)
395 struct dasd_device *device;
396 struct dasd_information2_t *dasd_info;
399 struct ccw_device *cdev;
401 device = bdev->bd_disk->private_data;
405 if (!device->discipline->fill_info)
408 dasd_info = kmalloc(sizeof(struct dasd_information2_t), GFP_KERNEL);
409 if (dasd_info == NULL)
412 rc = device->discipline->fill_info(device, dasd_info);
420 dasd_info->devno = _ccw_device_get_device_number(device->cdev);
421 dasd_info->schid = _ccw_device_get_subchannel_number(device->cdev);
422 dasd_info->cu_type = cdev->id.cu_type;
423 dasd_info->cu_model = cdev->id.cu_model;
424 dasd_info->dev_type = cdev->id.dev_type;
425 dasd_info->dev_model = cdev->id.dev_model;
426 dasd_info->open_count = atomic_read(&device->open_count);
427 dasd_info->status = device->state;
430 * check if device is really formatted
431 * LDL / CDL was returned by 'fill_info'
433 if ((device->state < DASD_STATE_READY) ||
434 (dasd_check_blocksize(device->bp_block)))
435 dasd_info->format = DASD_FORMAT_NONE;
437 dasd_info->features |=
438 ((device->features & DASD_FEATURE_READONLY) != 0);
440 if (device->discipline)
441 memcpy(dasd_info->type, device->discipline->name, 4);
443 memcpy(dasd_info->type, "none", 4);
444 dasd_info->req_queue_len = 0;
445 dasd_info->chanq_len = 0;
446 if (device->request_queue->request_fn) {
448 #ifdef DASD_EXTENDED_PROFILING
451 spin_lock_irqsave(&device->lock, flags);
452 list_for_each(l, &device->request_queue->queue_head)
453 dasd_info->req_queue_len++;
454 spin_unlock_irqrestore(&device->lock, flags);
456 #endif /* DASD_EXTENDED_PROFILING */
457 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
458 list_for_each(l, &device->ccw_queue)
459 dasd_info->chanq_len++;
460 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev),
465 if (copy_to_user((long __user *) args, (long *) dasd_info,
466 ((no == (unsigned int) BIODASDINFO2) ?
467 sizeof (struct dasd_information2_t) :
468 sizeof (struct dasd_information_t))))
478 dasd_ioctl_set_ro(struct block_device *bdev, int no, long args)
480 struct dasd_device *device;
483 if (!capable(CAP_SYS_ADMIN))
485 if (bdev != bdev->bd_contains)
486 // ro setting is not allowed for partitions
488 if (get_user(intval, (int __user *) args))
490 device = bdev->bd_disk->private_data;
494 set_disk_ro(bdev->bd_disk, intval);
495 rc = dasd_set_feature(device->cdev, DASD_FEATURE_READONLY, intval);
501 * List of static ioctls.
503 static struct { int no; dasd_ioctl_fn_t fn; } dasd_ioctls[] =
505 { BIODASDDISABLE, dasd_ioctl_disable },
506 { BIODASDENABLE, dasd_ioctl_enable },
507 { BIODASDQUIESCE, dasd_ioctl_quiesce },
508 { BIODASDRESUME, dasd_ioctl_resume },
509 { BIODASDFMT, dasd_ioctl_format },
510 { BIODASDINFO, dasd_ioctl_information },
511 { BIODASDINFO2, dasd_ioctl_information },
512 { BIODASDPRRD, dasd_ioctl_read_profile },
513 { BIODASDPRRST, dasd_ioctl_reset_profile },
514 { BLKROSET, dasd_ioctl_set_ro },
515 { DASDAPIVER, dasd_ioctl_api_version },
520 dasd_ioctl_init(void)
524 for (i = 0; dasd_ioctls[i].no != -1; i++)
525 dasd_ioctl_no_register(NULL, dasd_ioctls[i].no,
532 dasd_ioctl_exit(void)
536 for (i = 0; dasd_ioctls[i].no != -1; i++)
537 dasd_ioctl_no_unregister(NULL, dasd_ioctls[i].no,
542 EXPORT_SYMBOL(dasd_ioctl_no_register);
543 EXPORT_SYMBOL(dasd_ioctl_no_unregister);