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>
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;
209 if (base->discipline->format_device == NULL)
212 if (base->state != DASD_STATE_BASIC) {
213 pr_warn("%s: The DASD cannot be formatted while it is enabled\n",
214 dev_name(&base->cdev->dev));
218 DBF_DEV_EVENT(DBF_NOTICE, base,
219 "formatting units %u to %u (%u B blocks) flags %u",
221 fdata->stop_unit, fdata->blksize, fdata->intensity);
223 /* Since dasdfmt keeps the device open after it was disabled,
224 * there still exists an inode for this device.
225 * We must update i_blkbits, otherwise we might get errors when
226 * enabling the device later.
228 if (fdata->start_unit == 0) {
229 struct block_device *bdev = bdget_disk(block->gdp, 0);
230 bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize);
234 rc = base->discipline->format_device(base, fdata, 1);
236 rc = base->discipline->format_device(base, fdata, 0);
241 static int dasd_check_format(struct dasd_block *block,
242 struct format_check_t *cdata)
244 struct dasd_device *base;
248 if (!base->discipline->check_device_format)
251 rc = base->discipline->check_device_format(base, cdata, 1);
253 rc = base->discipline->check_device_format(base, cdata, 0);
262 dasd_ioctl_format(struct block_device *bdev, void __user *argp)
264 struct dasd_device *base;
265 struct format_data_t fdata;
268 if (!capable(CAP_SYS_ADMIN))
272 base = dasd_device_from_gendisk(bdev->bd_disk);
275 if (base->features & DASD_FEATURE_READONLY ||
276 test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
277 dasd_put_device(base);
280 if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) {
281 dasd_put_device(base);
284 if (bdev != bdev->bd_contains) {
285 pr_warn("%s: The specified DASD is a partition and cannot be formatted\n",
286 dev_name(&base->cdev->dev));
287 dasd_put_device(base);
290 rc = dasd_format(base->block, &fdata);
291 dasd_put_device(base);
297 * Check device format
299 static int dasd_ioctl_check_format(struct block_device *bdev, void __user *argp)
301 struct format_check_t cdata;
302 struct dasd_device *base;
308 base = dasd_device_from_gendisk(bdev->bd_disk);
311 if (bdev != bdev->bd_contains) {
312 pr_warn("%s: The specified DASD is a partition and cannot be checked\n",
313 dev_name(&base->cdev->dev));
318 if (copy_from_user(&cdata, argp, sizeof(cdata))) {
323 rc = dasd_check_format(base->block, &cdata);
327 if (copy_to_user(argp, &cdata, sizeof(cdata)))
331 dasd_put_device(base);
336 static int dasd_release_space(struct dasd_device *device,
337 struct format_data_t *rdata)
339 if (!device->discipline->is_ese && !device->discipline->is_ese(device))
341 if (!device->discipline->release_space)
344 return device->discipline->release_space(device, rdata);
348 * Release allocated space
350 static int dasd_ioctl_release_space(struct block_device *bdev, void __user *argp)
352 struct format_data_t rdata;
353 struct dasd_device *base;
356 if (!capable(CAP_SYS_ADMIN))
361 base = dasd_device_from_gendisk(bdev->bd_disk);
364 if (base->features & DASD_FEATURE_READONLY ||
365 test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
369 if (bdev != bdev->bd_contains) {
370 pr_warn("%s: The specified DASD is a partition and tracks cannot be released\n",
371 dev_name(&base->cdev->dev));
376 if (copy_from_user(&rdata, argp, sizeof(rdata))) {
381 rc = dasd_release_space(base, &rdata);
384 dasd_put_device(base);
389 #ifdef CONFIG_DASD_PROFILE
391 * Reset device profile information
393 static int dasd_ioctl_reset_profile(struct dasd_block *block)
395 dasd_profile_reset(&block->profile);
400 * Return device profile information
402 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
404 struct dasd_profile_info_t *data;
407 data = kmalloc(sizeof(*data), GFP_KERNEL);
411 spin_lock_bh(&block->profile.lock);
412 if (block->profile.data) {
413 data->dasd_io_reqs = block->profile.data->dasd_io_reqs;
414 data->dasd_io_sects = block->profile.data->dasd_io_sects;
415 memcpy(data->dasd_io_secs, block->profile.data->dasd_io_secs,
416 sizeof(data->dasd_io_secs));
417 memcpy(data->dasd_io_times, block->profile.data->dasd_io_times,
418 sizeof(data->dasd_io_times));
419 memcpy(data->dasd_io_timps, block->profile.data->dasd_io_timps,
420 sizeof(data->dasd_io_timps));
421 memcpy(data->dasd_io_time1, block->profile.data->dasd_io_time1,
422 sizeof(data->dasd_io_time1));
423 memcpy(data->dasd_io_time2, block->profile.data->dasd_io_time2,
424 sizeof(data->dasd_io_time2));
425 memcpy(data->dasd_io_time2ps,
426 block->profile.data->dasd_io_time2ps,
427 sizeof(data->dasd_io_time2ps));
428 memcpy(data->dasd_io_time3, block->profile.data->dasd_io_time3,
429 sizeof(data->dasd_io_time3));
430 memcpy(data->dasd_io_nr_req,
431 block->profile.data->dasd_io_nr_req,
432 sizeof(data->dasd_io_nr_req));
433 spin_unlock_bh(&block->profile.lock);
435 spin_unlock_bh(&block->profile.lock);
439 if (copy_to_user(argp, data, sizeof(*data)))
446 static int dasd_ioctl_reset_profile(struct dasd_block *block)
451 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
458 * Return dasd information. Used for BIODASDINFO and BIODASDINFO2.
460 static int dasd_ioctl_information(struct dasd_block *block,
461 unsigned int cmd, void __user *argp)
463 struct dasd_information2_t *dasd_info;
464 struct subchannel_id sch_id;
465 struct ccw_dev_id dev_id;
466 struct dasd_device *base;
467 struct ccw_device *cdev;
473 if (!base->discipline || !base->discipline->fill_info)
476 dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL);
477 if (dasd_info == NULL)
480 rc = base->discipline->fill_info(base, dasd_info);
487 ccw_device_get_id(cdev, &dev_id);
488 ccw_device_get_schid(cdev, &sch_id);
490 dasd_info->devno = dev_id.devno;
491 dasd_info->schid = sch_id.sch_no;
492 dasd_info->cu_type = cdev->id.cu_type;
493 dasd_info->cu_model = cdev->id.cu_model;
494 dasd_info->dev_type = cdev->id.dev_type;
495 dasd_info->dev_model = cdev->id.dev_model;
496 dasd_info->status = base->state;
498 * The open_count is increased for every opener, that includes
499 * the blkdev_get in dasd_scan_partitions.
500 * This must be hidden from user-space.
502 dasd_info->open_count = atomic_read(&block->open_count);
504 dasd_info->open_count++;
507 * check if device is really formatted
508 * LDL / CDL was returned by 'fill_info'
510 if ((base->state < DASD_STATE_READY) ||
511 (dasd_check_blocksize(block->bp_block)))
512 dasd_info->format = DASD_FORMAT_NONE;
514 dasd_info->features |=
515 ((base->features & DASD_FEATURE_READONLY) != 0);
517 memcpy(dasd_info->type, base->discipline->name, 4);
519 spin_lock_irqsave(&block->queue_lock, flags);
520 list_for_each(l, &base->ccw_queue)
521 dasd_info->chanq_len++;
522 spin_unlock_irqrestore(&block->queue_lock, flags);
525 if (copy_to_user(argp, dasd_info,
526 ((cmd == (unsigned int) BIODASDINFO2) ?
527 sizeof(struct dasd_information2_t) :
528 sizeof(struct dasd_information_t))))
538 dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp)
540 struct dasd_device *base;
543 if (!capable(CAP_SYS_ADMIN))
545 if (bdev != bdev->bd_contains)
546 // ro setting is not allowed for partitions
548 if (get_user(intval, (int __user *)argp))
550 base = dasd_device_from_gendisk(bdev->bd_disk);
553 if (!intval && test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
554 dasd_put_device(base);
557 set_disk_ro(bdev->bd_disk, intval);
558 rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, intval);
559 dasd_put_device(base);
563 static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd,
564 struct cmbdata __user *argp)
566 size_t size = _IOC_SIZE(cmd);
570 ret = cmf_readall(block->base->cdev, &data);
571 if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp))))
576 int dasd_ioctl(struct block_device *bdev, fmode_t mode,
577 unsigned int cmd, unsigned long arg)
579 struct dasd_block *block;
580 struct dasd_device *base;
584 if (is_compat_task())
585 argp = compat_ptr(arg);
587 argp = (void __user *)arg;
589 if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) {
590 PRINT_DEBUG("empty data ptr");
594 base = dasd_device_from_gendisk(bdev->bd_disk);
601 rc = dasd_ioctl_disable(bdev);
604 rc = dasd_ioctl_enable(bdev);
607 rc = dasd_ioctl_quiesce(block);
610 rc = dasd_ioctl_resume(block);
613 rc = dasd_ioctl_abortio(block);
616 rc = dasd_ioctl_allowio(block);
619 rc = dasd_ioctl_format(bdev, argp);
621 case BIODASDCHECKFMT:
622 rc = dasd_ioctl_check_format(bdev, argp);
625 rc = dasd_ioctl_information(block, cmd, argp);
628 rc = dasd_ioctl_information(block, cmd, argp);
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);