2 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
3 * Horst Hummel <Horst.Hummel@de.ibm.com>
4 * Carsten Otte <Cotte@de.ibm.com>
5 * Martin Schwidefsky <schwidefsky@de.ibm.com>
6 * Bugreports.to..: <Linux390@de.ibm.com>
7 * Copyright IBM Corp. 1999, 2001
9 * i/o controls for the dasd driver.
12 #define KMSG_COMPONENT "dasd"
14 #include <linux/interrupt.h>
15 #include <linux/compat.h>
16 #include <linux/major.h>
18 #include <linux/blkpg.h>
19 #include <linux/slab.h>
20 #include <asm/compat.h>
21 #include <asm/ccwdev.h>
22 #include <asm/schid.h>
24 #include <asm/uaccess.h>
27 #define PRINTK_HEADER "dasd_ioctl:"
33 dasd_ioctl_api_version(void __user *argp)
35 int ver = DASD_API_VERSION;
36 return put_user(ver, (int __user *)argp);
41 * used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection
44 dasd_ioctl_enable(struct block_device *bdev)
46 struct dasd_device *base;
48 if (!capable(CAP_SYS_ADMIN))
51 base = dasd_device_from_gendisk(bdev->bd_disk);
55 dasd_enable_device(base);
56 /* Formatting the dasd device can change the capacity. */
57 mutex_lock(&bdev->bd_mutex);
58 i_size_write(bdev->bd_inode,
59 (loff_t)get_capacity(base->block->gdp) << 9);
60 mutex_unlock(&bdev->bd_mutex);
61 dasd_put_device(base);
67 * Used by dasdfmt. Disable I/O operations but allow ioctls.
70 dasd_ioctl_disable(struct block_device *bdev)
72 struct dasd_device *base;
74 if (!capable(CAP_SYS_ADMIN))
77 base = dasd_device_from_gendisk(bdev->bd_disk);
81 * Man this is sick. We don't do a real disable but only downgrade
82 * the device to DASD_STATE_BASIC. The reason is that dasdfmt uses
83 * BIODASDDISABLE to disable accesses to the device via the block
84 * device layer but it still wants to do i/o on the device by
85 * using the BIODASDFMT ioctl. Therefore the correct state for the
86 * device is DASD_STATE_BASIC that allows to do basic i/o.
88 dasd_set_target_state(base, DASD_STATE_BASIC);
90 * Set i_size to zero, since read, write, etc. check against this
93 mutex_lock(&bdev->bd_mutex);
94 i_size_write(bdev->bd_inode, 0);
95 mutex_unlock(&bdev->bd_mutex);
96 dasd_put_device(base);
103 static int dasd_ioctl_quiesce(struct dasd_block *block)
106 struct dasd_device *base;
109 if (!capable (CAP_SYS_ADMIN))
112 pr_info("%s: The DASD has been put in the quiesce "
113 "state\n", dev_name(&base->cdev->dev));
114 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
115 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
116 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
124 static int dasd_ioctl_resume(struct dasd_block *block)
127 struct dasd_device *base;
130 if (!capable (CAP_SYS_ADMIN))
133 pr_info("%s: I/O operations have been resumed "
134 "on the DASD\n", dev_name(&base->cdev->dev));
135 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
136 dasd_device_remove_stop_bits(base, DASD_STOPPED_QUIESCE);
137 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
139 dasd_schedule_block_bh(block);
144 * Abort all failfast I/O on a device.
146 static int dasd_ioctl_abortio(struct dasd_block *block)
149 struct dasd_device *base;
150 struct dasd_ccw_req *cqr, *n;
153 if (!capable(CAP_SYS_ADMIN))
156 if (test_and_set_bit(DASD_FLAG_ABORTALL, &base->flags))
158 DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag set");
160 spin_lock_irqsave(&block->request_queue_lock, flags);
161 spin_lock(&block->queue_lock);
162 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
163 if (test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
164 cqr->callback_data &&
165 cqr->callback_data != DASD_SLEEPON_START_TAG &&
166 cqr->callback_data != DASD_SLEEPON_END_TAG) {
167 spin_unlock(&block->queue_lock);
168 blk_abort_request(cqr->callback_data);
169 spin_lock(&block->queue_lock);
172 spin_unlock(&block->queue_lock);
173 spin_unlock_irqrestore(&block->request_queue_lock, flags);
175 dasd_schedule_block_bh(block);
180 * Allow I/O on a device
182 static int dasd_ioctl_allowio(struct dasd_block *block)
184 struct dasd_device *base;
187 if (!capable(CAP_SYS_ADMIN))
190 if (test_and_clear_bit(DASD_FLAG_ABORTALL, &base->flags))
191 DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag unset");
197 * performs formatting of _device_ according to _fdata_
198 * Note: The discipline's format_function is assumed to deliver formatting
199 * commands to format multiple units of the device. In terms of the ECKD
200 * devices this means CCWs are generated to format multiple tracks.
203 dasd_format(struct dasd_block *block, struct format_data_t *fdata)
205 struct dasd_device *base;
211 if (base->discipline->format_device == NULL)
214 if (base->state != DASD_STATE_BASIC) {
215 pr_warn("%s: The DASD cannot be formatted while it is enabled\n",
216 dev_name(&base->cdev->dev));
220 DBF_DEV_EVENT(DBF_NOTICE, base,
221 "formatting units %u to %u (%u B blocks) flags %u",
223 fdata->stop_unit, fdata->blksize, fdata->intensity);
225 /* Since dasdfmt keeps the device open after it was disabled,
226 * there still exists an inode for this device.
227 * We must update i_blkbits, otherwise we might get errors when
228 * enabling the device later.
230 if (fdata->start_unit == 0) {
231 struct block_device *bdev = bdget_disk(block->gdp, 0);
232 bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize);
237 /* backup start- and endtrack for retries */
238 start = fdata->start_unit;
239 stop = fdata->stop_unit;
241 rc = base->discipline->format_device(base, fdata, enable_pav);
245 /* disable PAV in case of errors */
247 fdata->start_unit = start;
248 fdata->stop_unit = stop;
266 dasd_ioctl_format(struct block_device *bdev, void __user *argp)
268 struct dasd_device *base;
269 struct format_data_t fdata;
272 if (!capable(CAP_SYS_ADMIN))
276 base = dasd_device_from_gendisk(bdev->bd_disk);
279 if (base->features & DASD_FEATURE_READONLY ||
280 test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
281 dasd_put_device(base);
284 if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) {
285 dasd_put_device(base);
288 if (bdev != bdev->bd_contains) {
289 pr_warning("%s: The specified DASD is a partition and cannot "
291 dev_name(&base->cdev->dev));
292 dasd_put_device(base);
295 rc = dasd_format(base->block, &fdata);
296 dasd_put_device(base);
300 #ifdef CONFIG_DASD_PROFILE
302 * Reset device profile information
304 static int dasd_ioctl_reset_profile(struct dasd_block *block)
306 dasd_profile_reset(&block->profile);
311 * Return device profile information
313 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
315 struct dasd_profile_info_t *data;
318 data = kmalloc(sizeof(*data), GFP_KERNEL);
322 spin_lock_bh(&block->profile.lock);
323 if (block->profile.data) {
324 data->dasd_io_reqs = block->profile.data->dasd_io_reqs;
325 data->dasd_io_sects = block->profile.data->dasd_io_sects;
326 memcpy(data->dasd_io_secs, block->profile.data->dasd_io_secs,
327 sizeof(data->dasd_io_secs));
328 memcpy(data->dasd_io_times, block->profile.data->dasd_io_times,
329 sizeof(data->dasd_io_times));
330 memcpy(data->dasd_io_timps, block->profile.data->dasd_io_timps,
331 sizeof(data->dasd_io_timps));
332 memcpy(data->dasd_io_time1, block->profile.data->dasd_io_time1,
333 sizeof(data->dasd_io_time1));
334 memcpy(data->dasd_io_time2, block->profile.data->dasd_io_time2,
335 sizeof(data->dasd_io_time2));
336 memcpy(data->dasd_io_time2ps,
337 block->profile.data->dasd_io_time2ps,
338 sizeof(data->dasd_io_time2ps));
339 memcpy(data->dasd_io_time3, block->profile.data->dasd_io_time3,
340 sizeof(data->dasd_io_time3));
341 memcpy(data->dasd_io_nr_req,
342 block->profile.data->dasd_io_nr_req,
343 sizeof(data->dasd_io_nr_req));
344 spin_unlock_bh(&block->profile.lock);
346 spin_unlock_bh(&block->profile.lock);
350 if (copy_to_user(argp, data, sizeof(*data)))
357 static int dasd_ioctl_reset_profile(struct dasd_block *block)
362 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
369 * Return dasd information. Used for BIODASDINFO and BIODASDINFO2.
371 static int dasd_ioctl_information(struct dasd_block *block,
372 unsigned int cmd, void __user *argp)
374 struct dasd_information2_t *dasd_info;
375 struct subchannel_id sch_id;
376 struct ccw_dev_id dev_id;
377 struct dasd_device *base;
378 struct ccw_device *cdev;
383 if (!base->discipline || !base->discipline->fill_info)
386 dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL);
387 if (dasd_info == NULL)
390 rc = base->discipline->fill_info(base, dasd_info);
397 ccw_device_get_id(cdev, &dev_id);
398 ccw_device_get_schid(cdev, &sch_id);
400 dasd_info->devno = dev_id.devno;
401 dasd_info->schid = sch_id.sch_no;
402 dasd_info->cu_type = cdev->id.cu_type;
403 dasd_info->cu_model = cdev->id.cu_model;
404 dasd_info->dev_type = cdev->id.dev_type;
405 dasd_info->dev_model = cdev->id.dev_model;
406 dasd_info->status = base->state;
408 * The open_count is increased for every opener, that includes
409 * the blkdev_get in dasd_scan_partitions.
410 * This must be hidden from user-space.
412 dasd_info->open_count = atomic_read(&block->open_count);
414 dasd_info->open_count++;
417 * check if device is really formatted
418 * LDL / CDL was returned by 'fill_info'
420 if ((base->state < DASD_STATE_READY) ||
421 (dasd_check_blocksize(block->bp_block)))
422 dasd_info->format = DASD_FORMAT_NONE;
424 dasd_info->features |=
425 ((base->features & DASD_FEATURE_READONLY) != 0);
427 memcpy(dasd_info->type, base->discipline->name, 4);
429 if (block->request_queue->request_fn) {
431 #ifdef DASD_EXTENDED_PROFILING
434 spin_lock_irqsave(&block->lock, flags);
435 list_for_each(l, &block->request_queue->queue_head)
436 dasd_info->req_queue_len++;
437 spin_unlock_irqrestore(&block->lock, flags);
439 #endif /* DASD_EXTENDED_PROFILING */
440 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
441 list_for_each(l, &base->ccw_queue)
442 dasd_info->chanq_len++;
443 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
448 if (copy_to_user(argp, dasd_info,
449 ((cmd == (unsigned int) BIODASDINFO2) ?
450 sizeof(struct dasd_information2_t) :
451 sizeof(struct dasd_information_t))))
461 dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp)
463 struct dasd_device *base;
466 if (!capable(CAP_SYS_ADMIN))
468 if (bdev != bdev->bd_contains)
469 // ro setting is not allowed for partitions
471 if (get_user(intval, (int __user *)argp))
473 base = dasd_device_from_gendisk(bdev->bd_disk);
476 if (!intval && test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
477 dasd_put_device(base);
480 set_disk_ro(bdev->bd_disk, intval);
481 rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, intval);
482 dasd_put_device(base);
486 static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd,
487 struct cmbdata __user *argp)
489 size_t size = _IOC_SIZE(cmd);
493 ret = cmf_readall(block->base->cdev, &data);
494 if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp))))
499 int dasd_ioctl(struct block_device *bdev, fmode_t mode,
500 unsigned int cmd, unsigned long arg)
502 struct dasd_block *block;
503 struct dasd_device *base;
507 if (is_compat_task())
508 argp = compat_ptr(arg);
510 argp = (void __user *)arg;
512 if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) {
513 PRINT_DEBUG("empty data ptr");
517 base = dasd_device_from_gendisk(bdev->bd_disk);
524 rc = dasd_ioctl_disable(bdev);
527 rc = dasd_ioctl_enable(bdev);
530 rc = dasd_ioctl_quiesce(block);
533 rc = dasd_ioctl_resume(block);
536 rc = dasd_ioctl_abortio(block);
539 rc = dasd_ioctl_allowio(block);
542 rc = dasd_ioctl_format(bdev, argp);
545 rc = dasd_ioctl_information(block, cmd, argp);
548 rc = dasd_ioctl_information(block, cmd, argp);
551 rc = dasd_ioctl_read_profile(block, argp);
554 rc = dasd_ioctl_reset_profile(block);
557 rc = dasd_ioctl_set_ro(bdev, argp);
560 rc = dasd_ioctl_api_version(argp);
562 case BIODASDCMFENABLE:
563 rc = enable_cmf(base->cdev);
565 case BIODASDCMFDISABLE:
566 rc = disable_cmf(base->cdev);
568 case BIODASDREADALLCMB:
569 rc = dasd_ioctl_readall_cmb(block, cmd, argp);
572 /* if the discipline has an ioctl method try it. */
574 if (base->discipline->ioctl)
575 rc = base->discipline->ioctl(block, cmd, argp);
577 dasd_put_device(base);