// SPDX-License-Identifier: GPL-2.0 /* * Author(s)......: Holger Smolinski * Horst Hummel * Carsten Otte * Martin Schwidefsky * Bugreports.to..: * Copyright IBM Corp. 1999, 2001 * * i/o controls for the dasd driver. */ #define KMSG_COMPONENT "dasd" #include #include #include #include #include #include #include #include #include #include #include /* 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); dasd_schedule_device_bh(base); 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(get_ccwdev_lock(base->cdev), flags); list_for_each(l, &base->ccw_queue) dasd_info->chanq_len++; spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), 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);