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 dasd_put_device(base);
63 * Used by dasdfmt. Disable I/O operations but allow ioctls.
66 dasd_ioctl_disable(struct block_device *bdev)
68 struct dasd_device *base;
70 if (!capable(CAP_SYS_ADMIN))
73 base = dasd_device_from_gendisk(bdev->bd_disk);
77 * Man this is sick. We don't do a real disable but only downgrade
78 * the device to DASD_STATE_BASIC. The reason is that dasdfmt uses
79 * BIODASDDISABLE to disable accesses to the device via the block
80 * device layer but it still wants to do i/o on the device by
81 * using the BIODASDFMT ioctl. Therefore the correct state for the
82 * device is DASD_STATE_BASIC that allows to do basic i/o.
84 dasd_set_target_state(base, DASD_STATE_BASIC);
86 * Set i_size to zero, since read, write, etc. check against this
89 set_capacity(bdev->bd_disk, 0);
90 dasd_put_device(base);
97 static int dasd_ioctl_quiesce(struct dasd_block *block)
100 struct dasd_device *base;
103 if (!capable (CAP_SYS_ADMIN))
106 pr_info("%s: The DASD has been put in the quiesce "
107 "state\n", dev_name(&base->cdev->dev));
108 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
109 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
110 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
118 static int dasd_ioctl_resume(struct dasd_block *block)
121 struct dasd_device *base;
124 if (!capable (CAP_SYS_ADMIN))
127 pr_info("%s: I/O operations have been resumed "
128 "on the DASD\n", dev_name(&base->cdev->dev));
129 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
130 dasd_device_remove_stop_bits(base, DASD_STOPPED_QUIESCE);
131 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
133 dasd_schedule_block_bh(block);
138 * Abort all failfast I/O on a device.
140 static int dasd_ioctl_abortio(struct dasd_block *block)
143 struct dasd_device *base;
144 struct dasd_ccw_req *cqr, *n;
147 if (!capable(CAP_SYS_ADMIN))
150 if (test_and_set_bit(DASD_FLAG_ABORTALL, &base->flags))
152 DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag set");
154 spin_lock_irqsave(&block->request_queue_lock, flags);
155 spin_lock(&block->queue_lock);
156 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
157 if (test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
158 cqr->callback_data &&
159 cqr->callback_data != DASD_SLEEPON_START_TAG &&
160 cqr->callback_data != DASD_SLEEPON_END_TAG) {
161 spin_unlock(&block->queue_lock);
162 blk_abort_request(cqr->callback_data);
163 spin_lock(&block->queue_lock);
166 spin_unlock(&block->queue_lock);
167 spin_unlock_irqrestore(&block->request_queue_lock, flags);
169 dasd_schedule_block_bh(block);
174 * Allow I/O on a device
176 static int dasd_ioctl_allowio(struct dasd_block *block)
178 struct dasd_device *base;
181 if (!capable(CAP_SYS_ADMIN))
184 if (test_and_clear_bit(DASD_FLAG_ABORTALL, &base->flags))
185 DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag unset");
191 * performs formatting of _device_ according to _fdata_
192 * Note: The discipline's format_function is assumed to deliver formatting
193 * commands to format multiple units of the device. In terms of the ECKD
194 * devices this means CCWs are generated to format multiple tracks.
197 dasd_format(struct dasd_block *block, struct format_data_t *fdata)
199 struct dasd_device *base;
203 if (base->discipline->format_device == NULL)
206 if (base->state != DASD_STATE_BASIC) {
207 pr_warn("%s: The DASD cannot be formatted while it is enabled\n",
208 dev_name(&base->cdev->dev));
212 DBF_DEV_EVENT(DBF_NOTICE, base,
213 "formatting units %u to %u (%u B blocks) flags %u",
215 fdata->stop_unit, fdata->blksize, fdata->intensity);
217 /* Since dasdfmt keeps the device open after it was disabled,
218 * there still exists an inode for this device.
219 * We must update i_blkbits, otherwise we might get errors when
220 * enabling the device later.
222 if (fdata->start_unit == 0) {
223 block->gdp->part0->bd_inode->i_blkbits =
224 blksize_bits(fdata->blksize);
227 rc = base->discipline->format_device(base, fdata, 1);
229 rc = base->discipline->format_device(base, fdata, 0);
234 static int dasd_check_format(struct dasd_block *block,
235 struct format_check_t *cdata)
237 struct dasd_device *base;
241 if (!base->discipline->check_device_format)
244 rc = base->discipline->check_device_format(base, cdata, 1);
246 rc = base->discipline->check_device_format(base, cdata, 0);
255 dasd_ioctl_format(struct block_device *bdev, void __user *argp)
257 struct dasd_device *base;
258 struct format_data_t fdata;
261 if (!capable(CAP_SYS_ADMIN))
265 base = dasd_device_from_gendisk(bdev->bd_disk);
268 if (base->features & DASD_FEATURE_READONLY ||
269 test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
270 dasd_put_device(base);
273 if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) {
274 dasd_put_device(base);
277 if (bdev_is_partition(bdev)) {
278 pr_warn("%s: The specified DASD is a partition and cannot be formatted\n",
279 dev_name(&base->cdev->dev));
280 dasd_put_device(base);
283 rc = dasd_format(base->block, &fdata);
284 dasd_put_device(base);
290 * Check device format
292 static int dasd_ioctl_check_format(struct block_device *bdev, void __user *argp)
294 struct format_check_t cdata;
295 struct dasd_device *base;
301 base = dasd_device_from_gendisk(bdev->bd_disk);
304 if (bdev_is_partition(bdev)) {
305 pr_warn("%s: The specified DASD is a partition and cannot be checked\n",
306 dev_name(&base->cdev->dev));
311 if (copy_from_user(&cdata, argp, sizeof(cdata))) {
316 rc = dasd_check_format(base->block, &cdata);
320 if (copy_to_user(argp, &cdata, sizeof(cdata)))
324 dasd_put_device(base);
329 static int dasd_release_space(struct dasd_device *device,
330 struct format_data_t *rdata)
332 if (!device->discipline->is_ese && !device->discipline->is_ese(device))
334 if (!device->discipline->release_space)
337 return device->discipline->release_space(device, rdata);
341 * Release allocated space
343 static int dasd_ioctl_release_space(struct block_device *bdev, void __user *argp)
345 struct format_data_t rdata;
346 struct dasd_device *base;
349 if (!capable(CAP_SYS_ADMIN))
354 base = dasd_device_from_gendisk(bdev->bd_disk);
357 if (base->features & DASD_FEATURE_READONLY ||
358 test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
362 if (bdev_is_partition(bdev)) {
363 pr_warn("%s: The specified DASD is a partition and tracks cannot be released\n",
364 dev_name(&base->cdev->dev));
369 if (copy_from_user(&rdata, argp, sizeof(rdata))) {
374 rc = dasd_release_space(base, &rdata);
377 dasd_put_device(base);
382 #ifdef CONFIG_DASD_PROFILE
384 * Reset device profile information
386 static int dasd_ioctl_reset_profile(struct dasd_block *block)
388 dasd_profile_reset(&block->profile);
393 * Return device profile information
395 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
397 struct dasd_profile_info_t *data;
400 data = kmalloc(sizeof(*data), GFP_KERNEL);
404 spin_lock_bh(&block->profile.lock);
405 if (block->profile.data) {
406 data->dasd_io_reqs = block->profile.data->dasd_io_reqs;
407 data->dasd_io_sects = block->profile.data->dasd_io_sects;
408 memcpy(data->dasd_io_secs, block->profile.data->dasd_io_secs,
409 sizeof(data->dasd_io_secs));
410 memcpy(data->dasd_io_times, block->profile.data->dasd_io_times,
411 sizeof(data->dasd_io_times));
412 memcpy(data->dasd_io_timps, block->profile.data->dasd_io_timps,
413 sizeof(data->dasd_io_timps));
414 memcpy(data->dasd_io_time1, block->profile.data->dasd_io_time1,
415 sizeof(data->dasd_io_time1));
416 memcpy(data->dasd_io_time2, block->profile.data->dasd_io_time2,
417 sizeof(data->dasd_io_time2));
418 memcpy(data->dasd_io_time2ps,
419 block->profile.data->dasd_io_time2ps,
420 sizeof(data->dasd_io_time2ps));
421 memcpy(data->dasd_io_time3, block->profile.data->dasd_io_time3,
422 sizeof(data->dasd_io_time3));
423 memcpy(data->dasd_io_nr_req,
424 block->profile.data->dasd_io_nr_req,
425 sizeof(data->dasd_io_nr_req));
426 spin_unlock_bh(&block->profile.lock);
428 spin_unlock_bh(&block->profile.lock);
432 if (copy_to_user(argp, data, sizeof(*data)))
439 static int dasd_ioctl_reset_profile(struct dasd_block *block)
444 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
451 * Return dasd information. Used for BIODASDINFO and BIODASDINFO2.
453 static int __dasd_ioctl_information(struct dasd_block *block,
454 struct dasd_information2_t *dasd_info)
456 struct subchannel_id sch_id;
457 struct ccw_dev_id dev_id;
458 struct dasd_device *base;
459 struct ccw_device *cdev;
465 if (!base->discipline || !base->discipline->fill_info)
468 rc = base->discipline->fill_info(base, dasd_info);
473 ccw_device_get_id(cdev, &dev_id);
474 ccw_device_get_schid(cdev, &sch_id);
476 dasd_info->devno = dev_id.devno;
477 dasd_info->schid = sch_id.sch_no;
478 dasd_info->cu_type = cdev->id.cu_type;
479 dasd_info->cu_model = cdev->id.cu_model;
480 dasd_info->dev_type = cdev->id.dev_type;
481 dasd_info->dev_model = cdev->id.dev_model;
482 dasd_info->status = base->state;
484 * The open_count is increased for every opener, that includes
485 * the blkdev_get in dasd_scan_partitions.
486 * This must be hidden from user-space.
488 dasd_info->open_count = atomic_read(&block->open_count);
490 dasd_info->open_count++;
493 * check if device is really formatted
494 * LDL / CDL was returned by 'fill_info'
496 if ((base->state < DASD_STATE_READY) ||
497 (dasd_check_blocksize(block->bp_block)))
498 dasd_info->format = DASD_FORMAT_NONE;
500 dasd_info->features |=
501 ((base->features & DASD_FEATURE_READONLY) != 0);
503 memcpy(dasd_info->type, base->discipline->name, 4);
505 spin_lock_irqsave(&block->queue_lock, flags);
506 list_for_each(l, &base->ccw_queue)
507 dasd_info->chanq_len++;
508 spin_unlock_irqrestore(&block->queue_lock, flags);
512 static int dasd_ioctl_information(struct dasd_block *block, void __user *argp,
515 struct dasd_information2_t *dasd_info;
518 dasd_info = kzalloc(sizeof(*dasd_info), GFP_KERNEL);
522 error = __dasd_ioctl_information(block, dasd_info);
523 if (!error && copy_to_user(argp, dasd_info, copy_size))
532 int dasd_set_read_only(struct block_device *bdev, bool ro)
534 struct dasd_device *base;
537 /* do not manipulate hardware state for partitions */
538 if (bdev_is_partition(bdev))
541 base = dasd_device_from_gendisk(bdev->bd_disk);
544 if (!ro && test_bit(DASD_FLAG_DEVICE_RO, &base->flags))
547 rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, ro);
548 dasd_put_device(base);
552 static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd,
553 struct cmbdata __user *argp)
555 size_t size = _IOC_SIZE(cmd);
559 ret = cmf_readall(block->base->cdev, &data);
560 if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp))))
565 int dasd_ioctl(struct block_device *bdev, fmode_t mode,
566 unsigned int cmd, unsigned long arg)
568 struct dasd_block *block;
569 struct dasd_device *base;
573 if (is_compat_task())
574 argp = compat_ptr(arg);
576 argp = (void __user *)arg;
578 if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) {
579 PRINT_DEBUG("empty data ptr");
583 base = dasd_device_from_gendisk(bdev->bd_disk);
590 rc = dasd_ioctl_disable(bdev);
593 rc = dasd_ioctl_enable(bdev);
596 rc = dasd_ioctl_quiesce(block);
599 rc = dasd_ioctl_resume(block);
602 rc = dasd_ioctl_abortio(block);
605 rc = dasd_ioctl_allowio(block);
608 rc = dasd_ioctl_format(bdev, argp);
610 case BIODASDCHECKFMT:
611 rc = dasd_ioctl_check_format(bdev, argp);
614 rc = dasd_ioctl_information(block, argp,
615 sizeof(struct dasd_information_t));
618 rc = dasd_ioctl_information(block, argp,
619 sizeof(struct dasd_information2_t));
622 rc = dasd_ioctl_read_profile(block, argp);
625 rc = dasd_ioctl_reset_profile(block);
628 rc = dasd_ioctl_api_version(argp);
630 case BIODASDCMFENABLE:
631 rc = enable_cmf(base->cdev);
633 case BIODASDCMFDISABLE:
634 rc = disable_cmf(base->cdev);
636 case BIODASDREADALLCMB:
637 rc = dasd_ioctl_readall_cmb(block, cmd, argp);
640 rc = dasd_ioctl_release_space(bdev, argp);
643 /* if the discipline has an ioctl method try it. */
645 if (base->discipline->ioctl)
646 rc = base->discipline->ioctl(block, cmd, argp);
648 dasd_put_device(base);
654 * dasd_biodasdinfo() - fill out the dasd information structure
655 * @disk [in]: pointer to gendisk structure that references a DASD
656 * @info [out]: pointer to the dasd_information2_t structure
658 * Provide access to DASD specific information.
659 * The gendisk structure is checked if it belongs to the DASD driver by
660 * comparing the gendisk->fops pointer.
661 * If it does not belong to the DASD driver -EINVAL is returned.
662 * Otherwise the provided dasd_information2_t structure is filled out.
665 * %0 on success and a negative error value on failure.
667 int dasd_biodasdinfo(struct gendisk *disk, struct dasd_information2_t *info)
669 struct dasd_device *base;
672 if (disk->fops != &dasd_device_operations)
675 base = dasd_device_from_gendisk(disk);
678 error = __dasd_ioctl_information(base->block, info);
679 dasd_put_device(base);
682 /* export that symbol_get in partition detection is possible */
683 EXPORT_SYMBOL_GPL(dasd_biodasdinfo);