| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> |
| * Horst Hummel <Horst.Hummel@de.ibm.com> |
| * Carsten Otte <Cotte@de.ibm.com> |
| * Martin Schwidefsky <schwidefsky@de.ibm.com> |
| * Bugreports.to..: <Linux390@de.ibm.com> |
| * Copyright IBM Corp. 1999, 2001 |
| * |
| * i/o controls for the dasd driver. |
| */ |
| |
| #define KMSG_COMPONENT "dasd" |
| |
| #include <linux/interrupt.h> |
| #include <linux/compat.h> |
| #include <linux/major.h> |
| #include <linux/fs.h> |
| #include <linux/blkpg.h> |
| #include <linux/slab.h> |
| #include <asm/ccwdev.h> |
| #include <asm/schid.h> |
| #include <asm/cmb.h> |
| #include <linux/uaccess.h> |
| #include <linux/dasd_mod.h> |
| |
| /* This is ugly... */ |
| #define PRINTK_HEADER "dasd_ioctl:" |
| |
| #include "dasd_int.h" |
| |
| |
| static int |
| dasd_ioctl_api_version(void __user *argp) |
| { |
| int ver = DASD_API_VERSION; |
| return put_user(ver, (int __user *)argp); |
| } |
| |
| /* |
| * Enable device. |
| * used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection |
| */ |
| static int |
| dasd_ioctl_enable(struct block_device *bdev) |
| { |
| struct dasd_device *base; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EACCES; |
| |
| base = dasd_device_from_gendisk(bdev->bd_disk); |
| if (!base) |
| return -ENODEV; |
| |
| dasd_enable_device(base); |
| dasd_put_device(base); |
| return 0; |
| } |
| |
| /* |
| * Disable device. |
| * Used by dasdfmt. Disable I/O operations but allow ioctls. |
| */ |
| static int |
| dasd_ioctl_disable(struct block_device *bdev) |
| { |
| struct dasd_device *base; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EACCES; |
| |
| base = dasd_device_from_gendisk(bdev->bd_disk); |
| if (!base) |
| return -ENODEV; |
| /* |
| * Man this is sick. We don't do a real disable but only downgrade |
| * the device to DASD_STATE_BASIC. The reason is that dasdfmt uses |
| * BIODASDDISABLE to disable accesses to the device via the block |
| * device layer but it still wants to do i/o on the device by |
| * using the BIODASDFMT ioctl. Therefore the correct state for the |
| * device is DASD_STATE_BASIC that allows to do basic i/o. |
| */ |
| dasd_set_target_state(base, DASD_STATE_BASIC); |
| /* |
| * Set i_size to zero, since read, write, etc. check against this |
| * value. |
| */ |
| set_capacity(bdev->bd_disk, 0); |
| dasd_put_device(base); |
| return 0; |
| } |
| |
| /* |
| * Quiesce device. |
| */ |
| static int dasd_ioctl_quiesce(struct dasd_block *block) |
| { |
| unsigned long flags; |
| struct dasd_device *base; |
| |
| base = block->base; |
| if (!capable (CAP_SYS_ADMIN)) |
| return -EACCES; |
| |
| pr_info("%s: The DASD has been put in the quiesce " |
| "state\n", dev_name(&base->cdev->dev)); |
| spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); |
| dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE); |
| spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags); |
| return 0; |
| } |
| |
| |
| /* |
| * Resume device. |
| */ |
| static int dasd_ioctl_resume(struct dasd_block *block) |
| { |
| unsigned long flags; |
| struct dasd_device *base; |
| |
| base = block->base; |
| if (!capable (CAP_SYS_ADMIN)) |
| return -EACCES; |
| |
| pr_info("%s: I/O operations have been resumed " |
| "on the DASD\n", dev_name(&base->cdev->dev)); |
| spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); |
| dasd_device_remove_stop_bits(base, DASD_STOPPED_QUIESCE); |
| spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags); |
| |
| dasd_schedule_block_bh(block); |
| return 0; |
| } |
| |
| /* |
| * Abort all failfast I/O on a device. |
| */ |
| static int dasd_ioctl_abortio(struct dasd_block *block) |
| { |
| unsigned long flags; |
| struct dasd_device *base; |
| struct dasd_ccw_req *cqr, *n; |
| |
| base = block->base; |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EACCES; |
| |
| if (test_and_set_bit(DASD_FLAG_ABORTALL, &base->flags)) |
| return 0; |
| DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag set"); |
| |
| spin_lock_irqsave(&block->request_queue_lock, flags); |
| spin_lock(&block->queue_lock); |
| list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) { |
| if (test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && |
| cqr->callback_data && |
| cqr->callback_data != DASD_SLEEPON_START_TAG && |
| cqr->callback_data != DASD_SLEEPON_END_TAG) { |
| spin_unlock(&block->queue_lock); |
| blk_abort_request(cqr->callback_data); |
| spin_lock(&block->queue_lock); |
| } |
| } |
| spin_unlock(&block->queue_lock); |
| spin_unlock_irqrestore(&block->request_queue_lock, flags); |
| |
| dasd_schedule_block_bh(block); |
| return 0; |
| } |
| |
| /* |
| * Allow I/O on a device |
| */ |
| static int dasd_ioctl_allowio(struct dasd_block *block) |
| { |
| struct dasd_device *base; |
| |
| base = block->base; |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EACCES; |
| |
| if (test_and_clear_bit(DASD_FLAG_ABORTALL, &base->flags)) |
| DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag unset"); |
| |
| return 0; |
| } |
| |
| /* |
| * performs formatting of _device_ according to _fdata_ |
| * Note: The discipline's format_function is assumed to deliver formatting |
| * commands to format multiple units of the device. In terms of the ECKD |
| * devices this means CCWs are generated to format multiple tracks. |
| */ |
| static int |
| dasd_format(struct dasd_block *block, struct format_data_t *fdata) |
| { |
| struct dasd_device *base; |
| int rc; |
| |
| base = block->base; |
| if (base->discipline->format_device == NULL) |
| return -EPERM; |
| |
| if (base->state != DASD_STATE_BASIC) { |
| pr_warn("%s: The DASD cannot be formatted while it is enabled\n", |
| dev_name(&base->cdev->dev)); |
| return -EBUSY; |
| } |
| |
| DBF_DEV_EVENT(DBF_NOTICE, base, |
| "formatting units %u to %u (%u B blocks) flags %u", |
| fdata->start_unit, |
| fdata->stop_unit, fdata->blksize, fdata->intensity); |
| |
| /* Since dasdfmt keeps the device open after it was disabled, |
| * there still exists an inode for this device. |
| * We must update i_blkbits, otherwise we might get errors when |
| * enabling the device later. |
| */ |
| if (fdata->start_unit == 0) { |
| block->gdp->part0->bd_inode->i_blkbits = |
| blksize_bits(fdata->blksize); |
| } |
| |
| rc = base->discipline->format_device(base, fdata, 1); |
| if (rc == -EAGAIN) |
| rc = base->discipline->format_device(base, fdata, 0); |
| |
| return rc; |
| } |
| |
| static int dasd_check_format(struct dasd_block *block, |
| struct format_check_t *cdata) |
| { |
| struct dasd_device *base; |
| int rc; |
| |
| base = block->base; |
| if (!base->discipline->check_device_format) |
| return -ENOTTY; |
| |
| rc = base->discipline->check_device_format(base, cdata, 1); |
| if (rc == -EAGAIN) |
| rc = base->discipline->check_device_format(base, cdata, 0); |
| |
| return rc; |
| } |
| |
| /* |
| * Format device. |
| */ |
| static int |
| dasd_ioctl_format(struct block_device *bdev, void __user *argp) |
| { |
| struct dasd_device *base; |
| struct format_data_t fdata; |
| int rc; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EACCES; |
| if (!argp) |
| return -EINVAL; |
| base = dasd_device_from_gendisk(bdev->bd_disk); |
| if (!base) |
| return -ENODEV; |
| if (base->features & DASD_FEATURE_READONLY || |
| test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) { |
| dasd_put_device(base); |
| return -EROFS; |
| } |
| if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) { |
| dasd_put_device(base); |
| return -EFAULT; |
| } |
| if (bdev_is_partition(bdev)) { |
| pr_warn("%s: The specified DASD is a partition and cannot be formatted\n", |
| dev_name(&base->cdev->dev)); |
| dasd_put_device(base); |
| return -EINVAL; |
| } |
| rc = dasd_format(base->block, &fdata); |
| dasd_put_device(base); |
| |
| return rc; |
| } |
| |
| /* |
| * Check device format |
| */ |
| static int dasd_ioctl_check_format(struct block_device *bdev, void __user *argp) |
| { |
| struct format_check_t cdata; |
| struct dasd_device *base; |
| int rc = 0; |
| |
| if (!argp) |
| return -EINVAL; |
| |
| base = dasd_device_from_gendisk(bdev->bd_disk); |
| if (!base) |
| return -ENODEV; |
| if (bdev_is_partition(bdev)) { |
| pr_warn("%s: The specified DASD is a partition and cannot be checked\n", |
| dev_name(&base->cdev->dev)); |
| rc = -EINVAL; |
| goto out_err; |
| } |
| |
| if (copy_from_user(&cdata, argp, sizeof(cdata))) { |
| rc = -EFAULT; |
| goto out_err; |
| } |
| |
| rc = dasd_check_format(base->block, &cdata); |
| if (rc) |
| goto out_err; |
| |
| if (copy_to_user(argp, &cdata, sizeof(cdata))) |
| rc = -EFAULT; |
| |
| out_err: |
| dasd_put_device(base); |
| |
| return rc; |
| } |
| |
| static int dasd_release_space(struct dasd_device *device, |
| struct format_data_t *rdata) |
| { |
| if (!device->discipline->is_ese && !device->discipline->is_ese(device)) |
| return -ENOTSUPP; |
| if (!device->discipline->release_space) |
| return -ENOTSUPP; |
| |
| return device->discipline->release_space(device, rdata); |
| } |
| |
| /* |
| * Release allocated space |
| */ |
| static int dasd_ioctl_release_space(struct block_device *bdev, void __user *argp) |
| { |
| struct format_data_t rdata; |
| struct dasd_device *base; |
| int rc = 0; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EACCES; |
| if (!argp) |
| return -EINVAL; |
| |
| base = dasd_device_from_gendisk(bdev->bd_disk); |
| if (!base) |
| return -ENODEV; |
| if (base->features & DASD_FEATURE_READONLY || |
| test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) { |
| rc = -EROFS; |
| goto out_err; |
| } |
| if (bdev_is_partition(bdev)) { |
| pr_warn("%s: The specified DASD is a partition and tracks cannot be released\n", |
| dev_name(&base->cdev->dev)); |
| rc = -EINVAL; |
| goto out_err; |
| } |
| |
| if (copy_from_user(&rdata, argp, sizeof(rdata))) { |
| rc = -EFAULT; |
| goto out_err; |
| } |
| |
| rc = dasd_release_space(base, &rdata); |
| |
| out_err: |
| dasd_put_device(base); |
| |
| return rc; |
| } |
| |
| #ifdef CONFIG_DASD_PROFILE |
| /* |
| * Reset device profile information |
| */ |
| static int dasd_ioctl_reset_profile(struct dasd_block *block) |
| { |
| dasd_profile_reset(&block->profile); |
| return 0; |
| } |
| |
| /* |
| * Return device profile information |
| */ |
| static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp) |
| { |
| struct dasd_profile_info_t *data; |
| int rc = 0; |
| |
| data = kmalloc(sizeof(*data), GFP_KERNEL); |
| if (!data) |
| return -ENOMEM; |
| |
| spin_lock_bh(&block->profile.lock); |
| if (block->profile.data) { |
| data->dasd_io_reqs = block->profile.data->dasd_io_reqs; |
| data->dasd_io_sects = block->profile.data->dasd_io_sects; |
| memcpy(data->dasd_io_secs, block->profile.data->dasd_io_secs, |
| sizeof(data->dasd_io_secs)); |
| memcpy(data->dasd_io_times, block->profile.data->dasd_io_times, |
| sizeof(data->dasd_io_times)); |
| memcpy(data->dasd_io_timps, block->profile.data->dasd_io_timps, |
| sizeof(data->dasd_io_timps)); |
| memcpy(data->dasd_io_time1, block->profile.data->dasd_io_time1, |
| sizeof(data->dasd_io_time1)); |
| memcpy(data->dasd_io_time2, block->profile.data->dasd_io_time2, |
| sizeof(data->dasd_io_time2)); |
| memcpy(data->dasd_io_time2ps, |
| block->profile.data->dasd_io_time2ps, |
| sizeof(data->dasd_io_time2ps)); |
| memcpy(data->dasd_io_time3, block->profile.data->dasd_io_time3, |
| sizeof(data->dasd_io_time3)); |
| memcpy(data->dasd_io_nr_req, |
| block->profile.data->dasd_io_nr_req, |
| sizeof(data->dasd_io_nr_req)); |
| spin_unlock_bh(&block->profile.lock); |
| } else { |
| spin_unlock_bh(&block->profile.lock); |
| rc = -EIO; |
| goto out; |
| } |
| if (copy_to_user(argp, data, sizeof(*data))) |
| rc = -EFAULT; |
| out: |
| kfree(data); |
| return rc; |
| } |
| #else |
| static int dasd_ioctl_reset_profile(struct dasd_block *block) |
| { |
| return -ENOTTY; |
| } |
| |
| static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp) |
| { |
| return -ENOTTY; |
| } |
| #endif |
| |
| /* |
| * Return dasd information. Used for BIODASDINFO and BIODASDINFO2. |
| */ |
| static int __dasd_ioctl_information(struct dasd_block *block, |
| struct dasd_information2_t *dasd_info) |
| { |
| struct subchannel_id sch_id; |
| struct ccw_dev_id dev_id; |
| struct dasd_device *base; |
| struct ccw_device *cdev; |
| struct list_head *l; |
| unsigned long flags; |
| int rc; |
| |
| base = block->base; |
| if (!base->discipline || !base->discipline->fill_info) |
| return -EINVAL; |
| |
| rc = base->discipline->fill_info(base, dasd_info); |
| if (rc) |
| return rc; |
| |
| cdev = base->cdev; |
| ccw_device_get_id(cdev, &dev_id); |
| ccw_device_get_schid(cdev, &sch_id); |
| |
| dasd_info->devno = dev_id.devno; |
| dasd_info->schid = sch_id.sch_no; |
| dasd_info->cu_type = cdev->id.cu_type; |
| dasd_info->cu_model = cdev->id.cu_model; |
| dasd_info->dev_type = cdev->id.dev_type; |
| dasd_info->dev_model = cdev->id.dev_model; |
| dasd_info->status = base->state; |
| /* |
| * The open_count is increased for every opener, that includes |
| * the blkdev_get in dasd_scan_partitions. |
| * This must be hidden from user-space. |
| */ |
| dasd_info->open_count = atomic_read(&block->open_count); |
| if (!block->bdev) |
| dasd_info->open_count++; |
| |
| /* |
| * check if device is really formatted |
| * LDL / CDL was returned by 'fill_info' |
| */ |
| if ((base->state < DASD_STATE_READY) || |
| (dasd_check_blocksize(block->bp_block))) |
| dasd_info->format = DASD_FORMAT_NONE; |
| |
| dasd_info->features |= |
| ((base->features & DASD_FEATURE_READONLY) != 0); |
| |
| memcpy(dasd_info->type, base->discipline->name, 4); |
| |
| spin_lock_irqsave(&block->queue_lock, flags); |
| list_for_each(l, &base->ccw_queue) |
| dasd_info->chanq_len++; |
| spin_unlock_irqrestore(&block->queue_lock, flags); |
| return 0; |
| } |
| |
| static int dasd_ioctl_information(struct dasd_block *block, void __user *argp, |
| size_t copy_size) |
| { |
| struct dasd_information2_t *dasd_info; |
| int error; |
| |
| dasd_info = kzalloc(sizeof(*dasd_info), GFP_KERNEL); |
| if (!dasd_info) |
| return -ENOMEM; |
| |
| error = __dasd_ioctl_information(block, dasd_info); |
| if (!error && copy_to_user(argp, dasd_info, copy_size)) |
| error = -EFAULT; |
| kfree(dasd_info); |
| return error; |
| } |
| |
| /* |
| * Set read only |
| */ |
| int dasd_set_read_only(struct block_device *bdev, bool ro) |
| { |
| struct dasd_device *base; |
| int rc; |
| |
| /* do not manipulate hardware state for partitions */ |
| if (bdev_is_partition(bdev)) |
| return 0; |
| |
| base = dasd_device_from_gendisk(bdev->bd_disk); |
| if (!base) |
| return -ENODEV; |
| if (!ro && test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) |
| rc = -EROFS; |
| else |
| rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, ro); |
| dasd_put_device(base); |
| return rc; |
| } |
| |
| static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd, |
| struct cmbdata __user *argp) |
| { |
| size_t size = _IOC_SIZE(cmd); |
| struct cmbdata data; |
| int ret; |
| |
| ret = cmf_readall(block->base->cdev, &data); |
| if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp)))) |
| return -EFAULT; |
| return ret; |
| } |
| |
| int dasd_ioctl(struct block_device *bdev, fmode_t mode, |
| unsigned int cmd, unsigned long arg) |
| { |
| struct dasd_block *block; |
| struct dasd_device *base; |
| void __user *argp; |
| int rc; |
| |
| if (is_compat_task()) |
| argp = compat_ptr(arg); |
| else |
| argp = (void __user *)arg; |
| |
| if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) |
| return -EINVAL; |
| |
| base = dasd_device_from_gendisk(bdev->bd_disk); |
| if (!base) |
| return -ENODEV; |
| block = base->block; |
| rc = 0; |
| switch (cmd) { |
| case BIODASDDISABLE: |
| rc = dasd_ioctl_disable(bdev); |
| break; |
| case BIODASDENABLE: |
| rc = dasd_ioctl_enable(bdev); |
| break; |
| case BIODASDQUIESCE: |
| rc = dasd_ioctl_quiesce(block); |
| break; |
| case BIODASDRESUME: |
| rc = dasd_ioctl_resume(block); |
| break; |
| case BIODASDABORTIO: |
| rc = dasd_ioctl_abortio(block); |
| break; |
| case BIODASDALLOWIO: |
| rc = dasd_ioctl_allowio(block); |
| break; |
| case BIODASDFMT: |
| rc = dasd_ioctl_format(bdev, argp); |
| break; |
| case BIODASDCHECKFMT: |
| rc = dasd_ioctl_check_format(bdev, argp); |
| break; |
| case BIODASDINFO: |
| rc = dasd_ioctl_information(block, argp, |
| sizeof(struct dasd_information_t)); |
| break; |
| case BIODASDINFO2: |
| rc = dasd_ioctl_information(block, argp, |
| sizeof(struct dasd_information2_t)); |
| break; |
| case BIODASDPRRD: |
| rc = dasd_ioctl_read_profile(block, argp); |
| break; |
| case BIODASDPRRST: |
| rc = dasd_ioctl_reset_profile(block); |
| break; |
| case DASDAPIVER: |
| rc = dasd_ioctl_api_version(argp); |
| break; |
| case BIODASDCMFENABLE: |
| rc = enable_cmf(base->cdev); |
| break; |
| case BIODASDCMFDISABLE: |
| rc = disable_cmf(base->cdev); |
| break; |
| case BIODASDREADALLCMB: |
| rc = dasd_ioctl_readall_cmb(block, cmd, argp); |
| break; |
| case BIODASDRAS: |
| rc = dasd_ioctl_release_space(bdev, argp); |
| break; |
| default: |
| /* if the discipline has an ioctl method try it. */ |
| rc = -ENOTTY; |
| if (base->discipline->ioctl) |
| rc = base->discipline->ioctl(block, cmd, argp); |
| } |
| dasd_put_device(base); |
| return rc; |
| } |
| |
| |
| /** |
| * dasd_biodasdinfo() - fill out the dasd information structure |
| * @disk: [in] pointer to gendisk structure that references a DASD |
| * @info: [out] pointer to the dasd_information2_t structure |
| * |
| * Provide access to DASD specific information. |
| * The gendisk structure is checked if it belongs to the DASD driver by |
| * comparing the gendisk->fops pointer. |
| * If it does not belong to the DASD driver -EINVAL is returned. |
| * Otherwise the provided dasd_information2_t structure is filled out. |
| * |
| * Returns: |
| * %0 on success and a negative error value on failure. |
| */ |
| int dasd_biodasdinfo(struct gendisk *disk, struct dasd_information2_t *info) |
| { |
| struct dasd_device *base; |
| int error; |
| |
| if (disk->fops != &dasd_device_operations) |
| return -EINVAL; |
| |
| base = dasd_device_from_gendisk(disk); |
| if (!base) |
| return -ENODEV; |
| error = __dasd_ioctl_information(base->block, info); |
| dasd_put_device(base); |
| return error; |
| } |
| /* export that symbol_get in partition detection is possible */ |
| EXPORT_SYMBOL_GPL(dasd_biodasdinfo); |