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);
136 dasd_schedule_device_bh(base);
141 * Abort all failfast I/O on a device.
143 static int dasd_ioctl_abortio(struct dasd_block *block)
146 struct dasd_device *base;
147 struct dasd_ccw_req *cqr, *n;
150 if (!capable(CAP_SYS_ADMIN))
153 if (test_and_set_bit(DASD_FLAG_ABORTALL, &base->flags))
155 DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag set");
157 spin_lock_irqsave(&block->request_queue_lock, flags);
158 spin_lock(&block->queue_lock);
159 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
160 if (test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
161 cqr->callback_data &&
162 cqr->callback_data != DASD_SLEEPON_START_TAG &&
163 cqr->callback_data != DASD_SLEEPON_END_TAG) {
164 spin_unlock(&block->queue_lock);
165 blk_abort_request(cqr->callback_data);
166 spin_lock(&block->queue_lock);
169 spin_unlock(&block->queue_lock);
170 spin_unlock_irqrestore(&block->request_queue_lock, flags);
172 dasd_schedule_block_bh(block);
177 * Allow I/O on a device
179 static int dasd_ioctl_allowio(struct dasd_block *block)
181 struct dasd_device *base;
184 if (!capable(CAP_SYS_ADMIN))
187 if (test_and_clear_bit(DASD_FLAG_ABORTALL, &base->flags))
188 DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag unset");
194 * performs formatting of _device_ according to _fdata_
195 * Note: The discipline's format_function is assumed to deliver formatting
196 * commands to format multiple units of the device. In terms of the ECKD
197 * devices this means CCWs are generated to format multiple tracks.
200 dasd_format(struct dasd_block *block, struct format_data_t *fdata)
202 struct dasd_device *base;
206 if (base->discipline->format_device == NULL)
209 if (base->state != DASD_STATE_BASIC) {
210 pr_warn("%s: The DASD cannot be formatted while it is enabled\n",
211 dev_name(&base->cdev->dev));
215 DBF_DEV_EVENT(DBF_NOTICE, base,
216 "formatting units %u to %u (%u B blocks) flags %u",
218 fdata->stop_unit, fdata->blksize, fdata->intensity);
220 /* Since dasdfmt keeps the device open after it was disabled,
221 * there still exists an inode for this device.
222 * We must update i_blkbits, otherwise we might get errors when
223 * enabling the device later.
225 if (fdata->start_unit == 0) {
226 struct block_device *bdev = bdget_disk(block->gdp, 0);
227 bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize);
231 rc = base->discipline->format_device(base, fdata, 1);
233 rc = base->discipline->format_device(base, fdata, 0);
238 static int dasd_check_format(struct dasd_block *block,
239 struct format_check_t *cdata)
241 struct dasd_device *base;
245 if (!base->discipline->check_device_format)
248 rc = base->discipline->check_device_format(base, cdata, 1);
250 rc = base->discipline->check_device_format(base, cdata, 0);
259 dasd_ioctl_format(struct block_device *bdev, void __user *argp)
261 struct dasd_device *base;
262 struct format_data_t fdata;
265 if (!capable(CAP_SYS_ADMIN))
269 base = dasd_device_from_gendisk(bdev->bd_disk);
272 if (base->features & DASD_FEATURE_READONLY ||
273 test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
274 dasd_put_device(base);
277 if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) {
278 dasd_put_device(base);
281 if (bdev_is_partition(bdev)) {
282 pr_warn("%s: The specified DASD is a partition and cannot be formatted\n",
283 dev_name(&base->cdev->dev));
284 dasd_put_device(base);
287 rc = dasd_format(base->block, &fdata);
288 dasd_put_device(base);
294 * Check device format
296 static int dasd_ioctl_check_format(struct block_device *bdev, void __user *argp)
298 struct format_check_t cdata;
299 struct dasd_device *base;
305 base = dasd_device_from_gendisk(bdev->bd_disk);
308 if (bdev_is_partition(bdev)) {
309 pr_warn("%s: The specified DASD is a partition and cannot be checked\n",
310 dev_name(&base->cdev->dev));
315 if (copy_from_user(&cdata, argp, sizeof(cdata))) {
320 rc = dasd_check_format(base->block, &cdata);
324 if (copy_to_user(argp, &cdata, sizeof(cdata)))
328 dasd_put_device(base);
333 static int dasd_release_space(struct dasd_device *device,
334 struct format_data_t *rdata)
336 if (!device->discipline->is_ese && !device->discipline->is_ese(device))
338 if (!device->discipline->release_space)
341 return device->discipline->release_space(device, rdata);
345 * Release allocated space
347 static int dasd_ioctl_release_space(struct block_device *bdev, void __user *argp)
349 struct format_data_t rdata;
350 struct dasd_device *base;
353 if (!capable(CAP_SYS_ADMIN))
358 base = dasd_device_from_gendisk(bdev->bd_disk);
361 if (base->features & DASD_FEATURE_READONLY ||
362 test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
366 if (bdev_is_partition(bdev)) {
367 pr_warn("%s: The specified DASD is a partition and tracks cannot be released\n",
368 dev_name(&base->cdev->dev));
373 if (copy_from_user(&rdata, argp, sizeof(rdata))) {
378 rc = dasd_release_space(base, &rdata);
381 dasd_put_device(base);
386 #ifdef CONFIG_DASD_PROFILE
388 * Reset device profile information
390 static int dasd_ioctl_reset_profile(struct dasd_block *block)
392 dasd_profile_reset(&block->profile);
397 * Return device profile information
399 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
401 struct dasd_profile_info_t *data;
404 data = kmalloc(sizeof(*data), GFP_KERNEL);
408 spin_lock_bh(&block->profile.lock);
409 if (block->profile.data) {
410 data->dasd_io_reqs = block->profile.data->dasd_io_reqs;
411 data->dasd_io_sects = block->profile.data->dasd_io_sects;
412 memcpy(data->dasd_io_secs, block->profile.data->dasd_io_secs,
413 sizeof(data->dasd_io_secs));
414 memcpy(data->dasd_io_times, block->profile.data->dasd_io_times,
415 sizeof(data->dasd_io_times));
416 memcpy(data->dasd_io_timps, block->profile.data->dasd_io_timps,
417 sizeof(data->dasd_io_timps));
418 memcpy(data->dasd_io_time1, block->profile.data->dasd_io_time1,
419 sizeof(data->dasd_io_time1));
420 memcpy(data->dasd_io_time2, block->profile.data->dasd_io_time2,
421 sizeof(data->dasd_io_time2));
422 memcpy(data->dasd_io_time2ps,
423 block->profile.data->dasd_io_time2ps,
424 sizeof(data->dasd_io_time2ps));
425 memcpy(data->dasd_io_time3, block->profile.data->dasd_io_time3,
426 sizeof(data->dasd_io_time3));
427 memcpy(data->dasd_io_nr_req,
428 block->profile.data->dasd_io_nr_req,
429 sizeof(data->dasd_io_nr_req));
430 spin_unlock_bh(&block->profile.lock);
432 spin_unlock_bh(&block->profile.lock);
436 if (copy_to_user(argp, data, sizeof(*data)))
443 static int dasd_ioctl_reset_profile(struct dasd_block *block)
448 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
455 * Return dasd information. Used for BIODASDINFO and BIODASDINFO2.
457 static int __dasd_ioctl_information(struct dasd_block *block,
458 struct dasd_information2_t *dasd_info)
460 struct subchannel_id sch_id;
461 struct ccw_dev_id dev_id;
462 struct dasd_device *base;
463 struct ccw_device *cdev;
469 if (!base->discipline || !base->discipline->fill_info)
472 rc = base->discipline->fill_info(base, dasd_info);
477 ccw_device_get_id(cdev, &dev_id);
478 ccw_device_get_schid(cdev, &sch_id);
480 dasd_info->devno = dev_id.devno;
481 dasd_info->schid = sch_id.sch_no;
482 dasd_info->cu_type = cdev->id.cu_type;
483 dasd_info->cu_model = cdev->id.cu_model;
484 dasd_info->dev_type = cdev->id.dev_type;
485 dasd_info->dev_model = cdev->id.dev_model;
486 dasd_info->status = base->state;
488 * The open_count is increased for every opener, that includes
489 * the blkdev_get in dasd_scan_partitions.
490 * This must be hidden from user-space.
492 dasd_info->open_count = atomic_read(&block->open_count);
494 dasd_info->open_count++;
497 * check if device is really formatted
498 * LDL / CDL was returned by 'fill_info'
500 if ((base->state < DASD_STATE_READY) ||
501 (dasd_check_blocksize(block->bp_block)))
502 dasd_info->format = DASD_FORMAT_NONE;
504 dasd_info->features |=
505 ((base->features & DASD_FEATURE_READONLY) != 0);
507 memcpy(dasd_info->type, base->discipline->name, 4);
509 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
510 list_for_each(l, &base->ccw_queue)
511 dasd_info->chanq_len++;
512 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
516 static int dasd_ioctl_information(struct dasd_block *block, void __user *argp,
519 struct dasd_information2_t *dasd_info;
522 dasd_info = kzalloc(sizeof(*dasd_info), GFP_KERNEL);
526 error = __dasd_ioctl_information(block, dasd_info);
527 if (!error && copy_to_user(argp, dasd_info, copy_size))
537 dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp)
539 struct dasd_device *base;
542 if (!capable(CAP_SYS_ADMIN))
544 if (bdev_is_partition(bdev))
545 // ro setting is not allowed for partitions
547 if (get_user(intval, (int __user *)argp))
549 base = dasd_device_from_gendisk(bdev->bd_disk);
552 if (!intval && test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
553 dasd_put_device(base);
556 set_disk_ro(bdev->bd_disk, intval);
557 rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, intval);
558 dasd_put_device(base);
562 static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd,
563 struct cmbdata __user *argp)
565 size_t size = _IOC_SIZE(cmd);
569 ret = cmf_readall(block->base->cdev, &data);
570 if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp))))
575 int dasd_ioctl(struct block_device *bdev, fmode_t mode,
576 unsigned int cmd, unsigned long arg)
578 struct dasd_block *block;
579 struct dasd_device *base;
583 if (is_compat_task())
584 argp = compat_ptr(arg);
586 argp = (void __user *)arg;
588 if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) {
589 PRINT_DEBUG("empty data ptr");
593 base = dasd_device_from_gendisk(bdev->bd_disk);
600 rc = dasd_ioctl_disable(bdev);
603 rc = dasd_ioctl_enable(bdev);
606 rc = dasd_ioctl_quiesce(block);
609 rc = dasd_ioctl_resume(block);
612 rc = dasd_ioctl_abortio(block);
615 rc = dasd_ioctl_allowio(block);
618 rc = dasd_ioctl_format(bdev, argp);
620 case BIODASDCHECKFMT:
621 rc = dasd_ioctl_check_format(bdev, argp);
624 rc = dasd_ioctl_information(block, argp,
625 sizeof(struct dasd_information_t));
628 rc = dasd_ioctl_information(block, argp,
629 sizeof(struct dasd_information2_t));
632 rc = dasd_ioctl_read_profile(block, argp);
635 rc = dasd_ioctl_reset_profile(block);
638 rc = dasd_ioctl_set_ro(bdev, argp);
641 rc = dasd_ioctl_api_version(argp);
643 case BIODASDCMFENABLE:
644 rc = enable_cmf(base->cdev);
646 case BIODASDCMFDISABLE:
647 rc = disable_cmf(base->cdev);
649 case BIODASDREADALLCMB:
650 rc = dasd_ioctl_readall_cmb(block, cmd, argp);
653 rc = dasd_ioctl_release_space(bdev, argp);
656 /* if the discipline has an ioctl method try it. */
658 if (base->discipline->ioctl)
659 rc = base->discipline->ioctl(block, cmd, argp);
661 dasd_put_device(base);
667 * dasd_biodasdinfo() - fill out the dasd information structure
668 * @disk [in]: pointer to gendisk structure that references a DASD
669 * @info [out]: pointer to the dasd_information2_t structure
671 * Provide access to DASD specific information.
672 * The gendisk structure is checked if it belongs to the DASD driver by
673 * comparing the gendisk->fops pointer.
674 * If it does not belong to the DASD driver -EINVAL is returned.
675 * Otherwise the provided dasd_information2_t structure is filled out.
678 * %0 on success and a negative error value on failure.
680 int dasd_biodasdinfo(struct gendisk *disk, struct dasd_information2_t *info)
682 struct dasd_device *base;
685 if (disk->fops != &dasd_device_operations)
688 base = dasd_device_from_gendisk(disk);
691 error = __dasd_ioctl_information(base->block, info);
692 dasd_put_device(base);
695 /* export that symbol_get in partition detection is possible */
696 EXPORT_SYMBOL_GPL(dasd_biodasdinfo);