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/compat.h>
22 #include <asm/ccwdev.h>
23 #include <asm/schid.h>
25 #include <linux/uaccess.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 mutex_lock(&bdev->bd_mutex);
59 i_size_write(bdev->bd_inode,
60 (loff_t)get_capacity(base->block->gdp) << 9);
61 mutex_unlock(&bdev->bd_mutex);
62 dasd_put_device(base);
68 * Used by dasdfmt. Disable I/O operations but allow ioctls.
71 dasd_ioctl_disable(struct block_device *bdev)
73 struct dasd_device *base;
75 if (!capable(CAP_SYS_ADMIN))
78 base = dasd_device_from_gendisk(bdev->bd_disk);
82 * Man this is sick. We don't do a real disable but only downgrade
83 * the device to DASD_STATE_BASIC. The reason is that dasdfmt uses
84 * BIODASDDISABLE to disable accesses to the device via the block
85 * device layer but it still wants to do i/o on the device by
86 * using the BIODASDFMT ioctl. Therefore the correct state for the
87 * device is DASD_STATE_BASIC that allows to do basic i/o.
89 dasd_set_target_state(base, DASD_STATE_BASIC);
91 * Set i_size to zero, since read, write, etc. check against this
94 mutex_lock(&bdev->bd_mutex);
95 i_size_write(bdev->bd_inode, 0);
96 mutex_unlock(&bdev->bd_mutex);
97 dasd_put_device(base);
104 static int dasd_ioctl_quiesce(struct dasd_block *block)
107 struct dasd_device *base;
110 if (!capable (CAP_SYS_ADMIN))
113 pr_info("%s: The DASD has been put in the quiesce "
114 "state\n", dev_name(&base->cdev->dev));
115 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
116 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
117 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
125 static int dasd_ioctl_resume(struct dasd_block *block)
128 struct dasd_device *base;
131 if (!capable (CAP_SYS_ADMIN))
134 pr_info("%s: I/O operations have been resumed "
135 "on the DASD\n", dev_name(&base->cdev->dev));
136 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
137 dasd_device_remove_stop_bits(base, DASD_STOPPED_QUIESCE);
138 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
140 dasd_schedule_block_bh(block);
141 dasd_schedule_device_bh(base);
146 * Abort all failfast I/O on a device.
148 static int dasd_ioctl_abortio(struct dasd_block *block)
151 struct dasd_device *base;
152 struct dasd_ccw_req *cqr, *n;
155 if (!capable(CAP_SYS_ADMIN))
158 if (test_and_set_bit(DASD_FLAG_ABORTALL, &base->flags))
160 DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag set");
162 spin_lock_irqsave(&block->request_queue_lock, flags);
163 spin_lock(&block->queue_lock);
164 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
165 if (test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
166 cqr->callback_data &&
167 cqr->callback_data != DASD_SLEEPON_START_TAG &&
168 cqr->callback_data != DASD_SLEEPON_END_TAG) {
169 spin_unlock(&block->queue_lock);
170 blk_abort_request(cqr->callback_data);
171 spin_lock(&block->queue_lock);
174 spin_unlock(&block->queue_lock);
175 spin_unlock_irqrestore(&block->request_queue_lock, flags);
177 dasd_schedule_block_bh(block);
182 * Allow I/O on a device
184 static int dasd_ioctl_allowio(struct dasd_block *block)
186 struct dasd_device *base;
189 if (!capable(CAP_SYS_ADMIN))
192 if (test_and_clear_bit(DASD_FLAG_ABORTALL, &base->flags))
193 DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag unset");
199 * performs formatting of _device_ according to _fdata_
200 * Note: The discipline's format_function is assumed to deliver formatting
201 * commands to format multiple units of the device. In terms of the ECKD
202 * devices this means CCWs are generated to format multiple tracks.
205 dasd_format(struct dasd_block *block, struct format_data_t *fdata)
207 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);
236 rc = base->discipline->format_device(base, fdata, 1);
238 rc = base->discipline->format_device(base, fdata, 0);
243 static int dasd_check_format(struct dasd_block *block,
244 struct format_check_t *cdata)
246 struct dasd_device *base;
250 if (!base->discipline->check_device_format)
253 rc = base->discipline->check_device_format(base, cdata, 1);
255 rc = base->discipline->check_device_format(base, cdata, 0);
264 dasd_ioctl_format(struct block_device *bdev, void __user *argp)
266 struct dasd_device *base;
267 struct format_data_t fdata;
270 if (!capable(CAP_SYS_ADMIN))
274 base = dasd_device_from_gendisk(bdev->bd_disk);
277 if (base->features & DASD_FEATURE_READONLY ||
278 test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
279 dasd_put_device(base);
282 if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) {
283 dasd_put_device(base);
286 if (bdev != bdev->bd_contains) {
287 pr_warn("%s: The specified DASD is a partition and cannot be formatted\n",
288 dev_name(&base->cdev->dev));
289 dasd_put_device(base);
292 rc = dasd_format(base->block, &fdata);
293 dasd_put_device(base);
299 * Check device format
301 static int dasd_ioctl_check_format(struct block_device *bdev, void __user *argp)
303 struct format_check_t cdata;
304 struct dasd_device *base;
310 base = dasd_device_from_gendisk(bdev->bd_disk);
313 if (bdev != bdev->bd_contains) {
314 pr_warn("%s: The specified DASD is a partition and cannot be checked\n",
315 dev_name(&base->cdev->dev));
320 if (copy_from_user(&cdata, argp, sizeof(cdata))) {
325 rc = dasd_check_format(base->block, &cdata);
329 if (copy_to_user(argp, &cdata, sizeof(cdata)))
333 dasd_put_device(base);
338 #ifdef CONFIG_DASD_PROFILE
340 * Reset device profile information
342 static int dasd_ioctl_reset_profile(struct dasd_block *block)
344 dasd_profile_reset(&block->profile);
349 * Return device profile information
351 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
353 struct dasd_profile_info_t *data;
356 data = kmalloc(sizeof(*data), GFP_KERNEL);
360 spin_lock_bh(&block->profile.lock);
361 if (block->profile.data) {
362 data->dasd_io_reqs = block->profile.data->dasd_io_reqs;
363 data->dasd_io_sects = block->profile.data->dasd_io_sects;
364 memcpy(data->dasd_io_secs, block->profile.data->dasd_io_secs,
365 sizeof(data->dasd_io_secs));
366 memcpy(data->dasd_io_times, block->profile.data->dasd_io_times,
367 sizeof(data->dasd_io_times));
368 memcpy(data->dasd_io_timps, block->profile.data->dasd_io_timps,
369 sizeof(data->dasd_io_timps));
370 memcpy(data->dasd_io_time1, block->profile.data->dasd_io_time1,
371 sizeof(data->dasd_io_time1));
372 memcpy(data->dasd_io_time2, block->profile.data->dasd_io_time2,
373 sizeof(data->dasd_io_time2));
374 memcpy(data->dasd_io_time2ps,
375 block->profile.data->dasd_io_time2ps,
376 sizeof(data->dasd_io_time2ps));
377 memcpy(data->dasd_io_time3, block->profile.data->dasd_io_time3,
378 sizeof(data->dasd_io_time3));
379 memcpy(data->dasd_io_nr_req,
380 block->profile.data->dasd_io_nr_req,
381 sizeof(data->dasd_io_nr_req));
382 spin_unlock_bh(&block->profile.lock);
384 spin_unlock_bh(&block->profile.lock);
388 if (copy_to_user(argp, data, sizeof(*data)))
395 static int dasd_ioctl_reset_profile(struct dasd_block *block)
400 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
407 * Return dasd information. Used for BIODASDINFO and BIODASDINFO2.
409 static int dasd_ioctl_information(struct dasd_block *block,
410 unsigned int cmd, void __user *argp)
412 struct dasd_information2_t *dasd_info;
413 struct subchannel_id sch_id;
414 struct ccw_dev_id dev_id;
415 struct dasd_device *base;
416 struct ccw_device *cdev;
421 if (!base->discipline || !base->discipline->fill_info)
424 dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL);
425 if (dasd_info == NULL)
428 rc = base->discipline->fill_info(base, dasd_info);
435 ccw_device_get_id(cdev, &dev_id);
436 ccw_device_get_schid(cdev, &sch_id);
438 dasd_info->devno = dev_id.devno;
439 dasd_info->schid = sch_id.sch_no;
440 dasd_info->cu_type = cdev->id.cu_type;
441 dasd_info->cu_model = cdev->id.cu_model;
442 dasd_info->dev_type = cdev->id.dev_type;
443 dasd_info->dev_model = cdev->id.dev_model;
444 dasd_info->status = base->state;
446 * The open_count is increased for every opener, that includes
447 * the blkdev_get in dasd_scan_partitions.
448 * This must be hidden from user-space.
450 dasd_info->open_count = atomic_read(&block->open_count);
452 dasd_info->open_count++;
455 * check if device is really formatted
456 * LDL / CDL was returned by 'fill_info'
458 if ((base->state < DASD_STATE_READY) ||
459 (dasd_check_blocksize(block->bp_block)))
460 dasd_info->format = DASD_FORMAT_NONE;
462 dasd_info->features |=
463 ((base->features & DASD_FEATURE_READONLY) != 0);
465 memcpy(dasd_info->type, base->discipline->name, 4);
467 if (block->request_queue->request_fn) {
469 #ifdef DASD_EXTENDED_PROFILING
472 spin_lock_irqsave(&block->lock, flags);
473 list_for_each(l, &block->request_queue->queue_head)
474 dasd_info->req_queue_len++;
475 spin_unlock_irqrestore(&block->lock, flags);
477 #endif /* DASD_EXTENDED_PROFILING */
478 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
479 list_for_each(l, &base->ccw_queue)
480 dasd_info->chanq_len++;
481 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
486 if (copy_to_user(argp, dasd_info,
487 ((cmd == (unsigned int) BIODASDINFO2) ?
488 sizeof(struct dasd_information2_t) :
489 sizeof(struct dasd_information_t))))
499 dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp)
501 struct dasd_device *base;
504 if (!capable(CAP_SYS_ADMIN))
506 if (bdev != bdev->bd_contains)
507 // ro setting is not allowed for partitions
509 if (get_user(intval, (int __user *)argp))
511 base = dasd_device_from_gendisk(bdev->bd_disk);
514 if (!intval && test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
515 dasd_put_device(base);
518 set_disk_ro(bdev->bd_disk, intval);
519 rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, intval);
520 dasd_put_device(base);
524 static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd,
525 struct cmbdata __user *argp)
527 size_t size = _IOC_SIZE(cmd);
531 ret = cmf_readall(block->base->cdev, &data);
532 if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp))))
537 int dasd_ioctl(struct block_device *bdev, fmode_t mode,
538 unsigned int cmd, unsigned long arg)
540 struct dasd_block *block;
541 struct dasd_device *base;
545 if (is_compat_task())
546 argp = compat_ptr(arg);
548 argp = (void __user *)arg;
550 if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) {
551 PRINT_DEBUG("empty data ptr");
555 base = dasd_device_from_gendisk(bdev->bd_disk);
562 rc = dasd_ioctl_disable(bdev);
565 rc = dasd_ioctl_enable(bdev);
568 rc = dasd_ioctl_quiesce(block);
571 rc = dasd_ioctl_resume(block);
574 rc = dasd_ioctl_abortio(block);
577 rc = dasd_ioctl_allowio(block);
580 rc = dasd_ioctl_format(bdev, argp);
582 case BIODASDCHECKFMT:
583 rc = dasd_ioctl_check_format(bdev, argp);
586 rc = dasd_ioctl_information(block, cmd, argp);
589 rc = dasd_ioctl_information(block, cmd, argp);
592 rc = dasd_ioctl_read_profile(block, argp);
595 rc = dasd_ioctl_reset_profile(block);
598 rc = dasd_ioctl_set_ro(bdev, argp);
601 rc = dasd_ioctl_api_version(argp);
603 case BIODASDCMFENABLE:
604 rc = enable_cmf(base->cdev);
606 case BIODASDCMFDISABLE:
607 rc = disable_cmf(base->cdev);
609 case BIODASDREADALLCMB:
610 rc = dasd_ioctl_readall_cmb(block, cmd, argp);
613 /* if the discipline has an ioctl method try it. */
615 if (base->discipline->ioctl)
616 rc = base->discipline->ioctl(block, cmd, argp);
618 dasd_put_device(base);