1 // SPDX-License-Identifier: GPL-2.0
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 * Copyright IBM Corp. 1999, 2001
10 * i/o controls for the dasd driver.
13 #define KMSG_COMPONENT "dasd"
15 #include <linux/interrupt.h>
16 #include <linux/compat.h>
17 #include <linux/major.h>
19 #include <linux/blkpg.h>
20 #include <linux/slab.h>
21 #include <asm/ccwdev.h>
22 #include <asm/schid.h>
24 #include <linux/uaccess.h>
25 #include <linux/dasd_mod.h>
28 #define PRINTK_HEADER "dasd_ioctl:"
34 dasd_ioctl_api_version(void __user *argp)
36 int ver = DASD_API_VERSION;
37 return put_user(ver, (int __user *)argp);
42 * used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection
45 dasd_ioctl_enable(struct block_device *bdev)
47 struct dasd_device *base;
49 if (!capable(CAP_SYS_ADMIN))
52 base = dasd_device_from_gendisk(bdev->bd_disk);
56 dasd_enable_device(base);
57 /* Formatting the dasd device can change the capacity. */
58 bd_set_nr_sectors(bdev, get_capacity(base->block->gdp));
59 dasd_put_device(base);
65 * Used by dasdfmt. Disable I/O operations but allow ioctls.
68 dasd_ioctl_disable(struct block_device *bdev)
70 struct dasd_device *base;
72 if (!capable(CAP_SYS_ADMIN))
75 base = dasd_device_from_gendisk(bdev->bd_disk);
79 * Man this is sick. We don't do a real disable but only downgrade
80 * the device to DASD_STATE_BASIC. The reason is that dasdfmt uses
81 * BIODASDDISABLE to disable accesses to the device via the block
82 * device layer but it still wants to do i/o on the device by
83 * using the BIODASDFMT ioctl. Therefore the correct state for the
84 * device is DASD_STATE_BASIC that allows to do basic i/o.
86 dasd_set_target_state(base, DASD_STATE_BASIC);
88 * Set i_size to zero, since read, write, etc. check against this
91 bd_set_nr_sectors(bdev, 0);
92 dasd_put_device(base);
99 static int dasd_ioctl_quiesce(struct dasd_block *block)
102 struct dasd_device *base;
105 if (!capable (CAP_SYS_ADMIN))
108 pr_info("%s: The DASD has been put in the quiesce "
109 "state\n", dev_name(&base->cdev->dev));
110 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
111 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
112 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
120 static int dasd_ioctl_resume(struct dasd_block *block)
123 struct dasd_device *base;
126 if (!capable (CAP_SYS_ADMIN))
129 pr_info("%s: I/O operations have been resumed "
130 "on the DASD\n", dev_name(&base->cdev->dev));
131 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
132 dasd_device_remove_stop_bits(base, DASD_STOPPED_QUIESCE);
133 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
135 dasd_schedule_block_bh(block);
140 * Abort all failfast I/O on a device.
142 static int dasd_ioctl_abortio(struct dasd_block *block)
145 struct dasd_device *base;
146 struct dasd_ccw_req *cqr, *n;
149 if (!capable(CAP_SYS_ADMIN))
152 if (test_and_set_bit(DASD_FLAG_ABORTALL, &base->flags))
154 DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag set");
156 spin_lock_irqsave(&block->request_queue_lock, flags);
157 spin_lock(&block->queue_lock);
158 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
159 if (test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
160 cqr->callback_data &&
161 cqr->callback_data != DASD_SLEEPON_START_TAG &&
162 cqr->callback_data != DASD_SLEEPON_END_TAG) {
163 spin_unlock(&block->queue_lock);
164 blk_abort_request(cqr->callback_data);
165 spin_lock(&block->queue_lock);
168 spin_unlock(&block->queue_lock);
169 spin_unlock_irqrestore(&block->request_queue_lock, flags);
171 dasd_schedule_block_bh(block);
176 * Allow I/O on a device
178 static int dasd_ioctl_allowio(struct dasd_block *block)
180 struct dasd_device *base;
183 if (!capable(CAP_SYS_ADMIN))
186 if (test_and_clear_bit(DASD_FLAG_ABORTALL, &base->flags))
187 DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag unset");
193 * performs formatting of _device_ according to _fdata_
194 * Note: The discipline's format_function is assumed to deliver formatting
195 * commands to format multiple units of the device. In terms of the ECKD
196 * devices this means CCWs are generated to format multiple tracks.
199 dasd_format(struct dasd_block *block, struct format_data_t *fdata)
201 struct dasd_device *base;
205 if (base->discipline->format_device == NULL)
208 if (base->state != DASD_STATE_BASIC) {
209 pr_warn("%s: The DASD cannot be formatted while it is enabled\n",
210 dev_name(&base->cdev->dev));
214 DBF_DEV_EVENT(DBF_NOTICE, base,
215 "formatting units %u to %u (%u B blocks) flags %u",
217 fdata->stop_unit, fdata->blksize, fdata->intensity);
219 /* Since dasdfmt keeps the device open after it was disabled,
220 * there still exists an inode for this device.
221 * We must update i_blkbits, otherwise we might get errors when
222 * enabling the device later.
224 if (fdata->start_unit == 0) {
225 struct block_device *bdev = bdget_disk(block->gdp, 0);
226 bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize);
230 rc = base->discipline->format_device(base, fdata, 1);
232 rc = base->discipline->format_device(base, fdata, 0);
237 static int dasd_check_format(struct dasd_block *block,
238 struct format_check_t *cdata)
240 struct dasd_device *base;
244 if (!base->discipline->check_device_format)
247 rc = base->discipline->check_device_format(base, cdata, 1);
249 rc = base->discipline->check_device_format(base, cdata, 0);
258 dasd_ioctl_format(struct block_device *bdev, void __user *argp)
260 struct dasd_device *base;
261 struct format_data_t fdata;
264 if (!capable(CAP_SYS_ADMIN))
268 base = dasd_device_from_gendisk(bdev->bd_disk);
271 if (base->features & DASD_FEATURE_READONLY ||
272 test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
273 dasd_put_device(base);
276 if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) {
277 dasd_put_device(base);
280 if (bdev_is_partition(bdev)) {
281 pr_warn("%s: The specified DASD is a partition and cannot be formatted\n",
282 dev_name(&base->cdev->dev));
283 dasd_put_device(base);
286 rc = dasd_format(base->block, &fdata);
287 dasd_put_device(base);
293 * Check device format
295 static int dasd_ioctl_check_format(struct block_device *bdev, void __user *argp)
297 struct format_check_t cdata;
298 struct dasd_device *base;
304 base = dasd_device_from_gendisk(bdev->bd_disk);
307 if (bdev_is_partition(bdev)) {
308 pr_warn("%s: The specified DASD is a partition and cannot be checked\n",
309 dev_name(&base->cdev->dev));
314 if (copy_from_user(&cdata, argp, sizeof(cdata))) {
319 rc = dasd_check_format(base->block, &cdata);
323 if (copy_to_user(argp, &cdata, sizeof(cdata)))
327 dasd_put_device(base);
332 static int dasd_release_space(struct dasd_device *device,
333 struct format_data_t *rdata)
335 if (!device->discipline->is_ese && !device->discipline->is_ese(device))
337 if (!device->discipline->release_space)
340 return device->discipline->release_space(device, rdata);
344 * Release allocated space
346 static int dasd_ioctl_release_space(struct block_device *bdev, void __user *argp)
348 struct format_data_t rdata;
349 struct dasd_device *base;
352 if (!capable(CAP_SYS_ADMIN))
357 base = dasd_device_from_gendisk(bdev->bd_disk);
360 if (base->features & DASD_FEATURE_READONLY ||
361 test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
365 if (bdev_is_partition(bdev)) {
366 pr_warn("%s: The specified DASD is a partition and tracks cannot be released\n",
367 dev_name(&base->cdev->dev));
372 if (copy_from_user(&rdata, argp, sizeof(rdata))) {
377 rc = dasd_release_space(base, &rdata);
380 dasd_put_device(base);
385 #ifdef CONFIG_DASD_PROFILE
387 * Reset device profile information
389 static int dasd_ioctl_reset_profile(struct dasd_block *block)
391 dasd_profile_reset(&block->profile);
396 * Return device profile information
398 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
400 struct dasd_profile_info_t *data;
403 data = kmalloc(sizeof(*data), GFP_KERNEL);
407 spin_lock_bh(&block->profile.lock);
408 if (block->profile.data) {
409 data->dasd_io_reqs = block->profile.data->dasd_io_reqs;
410 data->dasd_io_sects = block->profile.data->dasd_io_sects;
411 memcpy(data->dasd_io_secs, block->profile.data->dasd_io_secs,
412 sizeof(data->dasd_io_secs));
413 memcpy(data->dasd_io_times, block->profile.data->dasd_io_times,
414 sizeof(data->dasd_io_times));
415 memcpy(data->dasd_io_timps, block->profile.data->dasd_io_timps,
416 sizeof(data->dasd_io_timps));
417 memcpy(data->dasd_io_time1, block->profile.data->dasd_io_time1,
418 sizeof(data->dasd_io_time1));
419 memcpy(data->dasd_io_time2, block->profile.data->dasd_io_time2,
420 sizeof(data->dasd_io_time2));
421 memcpy(data->dasd_io_time2ps,
422 block->profile.data->dasd_io_time2ps,
423 sizeof(data->dasd_io_time2ps));
424 memcpy(data->dasd_io_time3, block->profile.data->dasd_io_time3,
425 sizeof(data->dasd_io_time3));
426 memcpy(data->dasd_io_nr_req,
427 block->profile.data->dasd_io_nr_req,
428 sizeof(data->dasd_io_nr_req));
429 spin_unlock_bh(&block->profile.lock);
431 spin_unlock_bh(&block->profile.lock);
435 if (copy_to_user(argp, data, sizeof(*data)))
442 static int dasd_ioctl_reset_profile(struct dasd_block *block)
447 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
454 * Return dasd information. Used for BIODASDINFO and BIODASDINFO2.
456 static int __dasd_ioctl_information(struct dasd_block *block,
457 struct dasd_information2_t *dasd_info)
459 struct subchannel_id sch_id;
460 struct ccw_dev_id dev_id;
461 struct dasd_device *base;
462 struct ccw_device *cdev;
468 if (!base->discipline || !base->discipline->fill_info)
471 rc = base->discipline->fill_info(base, dasd_info);
476 ccw_device_get_id(cdev, &dev_id);
477 ccw_device_get_schid(cdev, &sch_id);
479 dasd_info->devno = dev_id.devno;
480 dasd_info->schid = sch_id.sch_no;
481 dasd_info->cu_type = cdev->id.cu_type;
482 dasd_info->cu_model = cdev->id.cu_model;
483 dasd_info->dev_type = cdev->id.dev_type;
484 dasd_info->dev_model = cdev->id.dev_model;
485 dasd_info->status = base->state;
487 * The open_count is increased for every opener, that includes
488 * the blkdev_get in dasd_scan_partitions.
489 * This must be hidden from user-space.
491 dasd_info->open_count = atomic_read(&block->open_count);
493 dasd_info->open_count++;
496 * check if device is really formatted
497 * LDL / CDL was returned by 'fill_info'
499 if ((base->state < DASD_STATE_READY) ||
500 (dasd_check_blocksize(block->bp_block)))
501 dasd_info->format = DASD_FORMAT_NONE;
503 dasd_info->features |=
504 ((base->features & DASD_FEATURE_READONLY) != 0);
506 memcpy(dasd_info->type, base->discipline->name, 4);
508 spin_lock_irqsave(&block->queue_lock, flags);
509 list_for_each(l, &base->ccw_queue)
510 dasd_info->chanq_len++;
511 spin_unlock_irqrestore(&block->queue_lock, flags);
515 static int dasd_ioctl_information(struct dasd_block *block, void __user *argp,
518 struct dasd_information2_t *dasd_info;
521 dasd_info = kzalloc(sizeof(*dasd_info), GFP_KERNEL);
525 error = __dasd_ioctl_information(block, dasd_info);
526 if (!error && copy_to_user(argp, dasd_info, copy_size))
536 dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp)
538 struct dasd_device *base;
541 if (!capable(CAP_SYS_ADMIN))
543 if (bdev_is_partition(bdev))
544 // ro setting is not allowed for partitions
546 if (get_user(intval, (int __user *)argp))
548 base = dasd_device_from_gendisk(bdev->bd_disk);
551 if (!intval && test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
552 dasd_put_device(base);
555 set_disk_ro(bdev->bd_disk, intval);
556 rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, intval);
557 dasd_put_device(base);
561 static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd,
562 struct cmbdata __user *argp)
564 size_t size = _IOC_SIZE(cmd);
568 ret = cmf_readall(block->base->cdev, &data);
569 if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp))))
574 int dasd_ioctl(struct block_device *bdev, fmode_t mode,
575 unsigned int cmd, unsigned long arg)
577 struct dasd_block *block;
578 struct dasd_device *base;
582 if (is_compat_task())
583 argp = compat_ptr(arg);
585 argp = (void __user *)arg;
587 if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) {
588 PRINT_DEBUG("empty data ptr");
592 base = dasd_device_from_gendisk(bdev->bd_disk);
599 rc = dasd_ioctl_disable(bdev);
602 rc = dasd_ioctl_enable(bdev);
605 rc = dasd_ioctl_quiesce(block);
608 rc = dasd_ioctl_resume(block);
611 rc = dasd_ioctl_abortio(block);
614 rc = dasd_ioctl_allowio(block);
617 rc = dasd_ioctl_format(bdev, argp);
619 case BIODASDCHECKFMT:
620 rc = dasd_ioctl_check_format(bdev, argp);
623 rc = dasd_ioctl_information(block, argp,
624 sizeof(struct dasd_information_t));
627 rc = dasd_ioctl_information(block, argp,
628 sizeof(struct dasd_information2_t));
631 rc = dasd_ioctl_read_profile(block, argp);
634 rc = dasd_ioctl_reset_profile(block);
637 rc = dasd_ioctl_set_ro(bdev, argp);
640 rc = dasd_ioctl_api_version(argp);
642 case BIODASDCMFENABLE:
643 rc = enable_cmf(base->cdev);
645 case BIODASDCMFDISABLE:
646 rc = disable_cmf(base->cdev);
648 case BIODASDREADALLCMB:
649 rc = dasd_ioctl_readall_cmb(block, cmd, argp);
652 rc = dasd_ioctl_release_space(bdev, argp);
655 /* if the discipline has an ioctl method try it. */
657 if (base->discipline->ioctl)
658 rc = base->discipline->ioctl(block, cmd, argp);
660 dasd_put_device(base);
666 * dasd_biodasdinfo() - fill out the dasd information structure
667 * @disk [in]: pointer to gendisk structure that references a DASD
668 * @info [out]: pointer to the dasd_information2_t structure
670 * Provide access to DASD specific information.
671 * The gendisk structure is checked if it belongs to the DASD driver by
672 * comparing the gendisk->fops pointer.
673 * If it does not belong to the DASD driver -EINVAL is returned.
674 * Otherwise the provided dasd_information2_t structure is filled out.
677 * %0 on success and a negative error value on failure.
679 int dasd_biodasdinfo(struct gendisk *disk, struct dasd_information2_t *info)
681 struct dasd_device *base;
684 if (disk->fops != &dasd_device_operations)
687 base = dasd_device_from_gendisk(disk);
690 error = __dasd_ioctl_information(base->block, info);
691 dasd_put_device(base);
694 /* export that symbol_get in partition detection is possible */
695 EXPORT_SYMBOL_GPL(dasd_biodasdinfo);