/* * File...........: linux/drivers/s390/block/dasd_ioctl.c * Author(s)......: Holger Smolinski * Horst Hummel * Carsten Otte * Martin Schwidefsky * Bugreports.to..: * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001 * * i/o controls for the dasd driver. */ #define KMSG_COMPONENT "dasd" #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); /* Formatting the dasd device can change the capacity. */ mutex_lock(&bdev->bd_mutex); i_size_write(bdev->bd_inode, (loff_t)get_capacity(base->block->gdp) << 9); mutex_unlock(&bdev->bd_mutex); 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. */ mutex_lock(&bdev->bd_mutex); i_size_write(bdev->bd_inode, 0); mutex_unlock(&bdev->bd_mutex); 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; } /* * performs formatting of _device_ according to _fdata_ * Note: The discipline's format_function is assumed to deliver formatting * commands to format a single unit of the device. In terms of the ECKD * devices this means CCWs are generated to format a single track. */ static int dasd_format(struct dasd_block *block, struct format_data_t *fdata) { struct dasd_ccw_req *cqr; struct dasd_device *base; int rc; base = block->base; if (base->discipline->format_device == NULL) return -EPERM; if (base->state != DASD_STATE_BASIC) { pr_warning("%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) { struct block_device *bdev = bdget_disk(block->gdp, 0); bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize); bdput(bdev); } while (fdata->start_unit <= fdata->stop_unit) { cqr = base->discipline->format_device(base, fdata); if (IS_ERR(cqr)) return PTR_ERR(cqr); rc = dasd_sleep_on_interruptible(cqr); dasd_sfree_request(cqr, cqr->memdev); if (rc) { if (rc != -ERESTARTSYS) pr_err("%s: Formatting unit %d failed with " "rc=%d\n", dev_name(&base->cdev->dev), fdata->start_unit, rc); return rc; } fdata->start_unit++; } return 0; } /* * 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 != bdev->bd_contains) { pr_warning("%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; } #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 -ENOSYS; } static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp) { return -ENOSYS; } #endif /* * Return dasd information. Used for BIODASDINFO and BIODASDINFO2. */ static int dasd_ioctl_information(struct dasd_block *block, unsigned int cmd, void __user *argp) { struct dasd_information2_t *dasd_info; unsigned long flags; int rc; struct dasd_device *base; struct ccw_device *cdev; struct ccw_dev_id dev_id; base = block->base; if (!base->discipline || !base->discipline->fill_info) return -EINVAL; dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL); if (dasd_info == NULL) return -ENOMEM; rc = base->discipline->fill_info(base, dasd_info); if (rc) { kfree(dasd_info); return rc; } cdev = base->cdev; ccw_device_get_id(cdev, &dev_id); dasd_info->devno = dev_id.devno; dasd_info->schid = _ccw_device_get_subchannel_number(base->cdev); 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); if (block->request_queue->request_fn) { struct list_head *l; #ifdef DASD_EXTENDED_PROFILING { struct list_head *l; spin_lock_irqsave(&block->lock, flags); list_for_each(l, &block->request_queue->queue_head) dasd_info->req_queue_len++; spin_unlock_irqrestore(&block->lock, flags); } #endif /* DASD_EXTENDED_PROFILING */ 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); } rc = 0; if (copy_to_user(argp, dasd_info, ((cmd == (unsigned int) BIODASDINFO2) ? sizeof(struct dasd_information2_t) : sizeof(struct dasd_information_t)))) rc = -EFAULT; kfree(dasd_info); return rc; } /* * Set read only */ static int dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp) { struct dasd_device *base; int intval, rc; if (!capable(CAP_SYS_ADMIN)) return -EACCES; if (bdev != bdev->bd_contains) // ro setting is not allowed for partitions return -EINVAL; if (get_user(intval, (int __user *)argp)) return -EFAULT; base = dasd_device_from_gendisk(bdev->bd_disk); if (!base) return -ENODEV; if (!intval && test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) { dasd_put_device(base); return -EROFS; } set_disk_ro(bdev->bd_disk, intval); rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, intval); 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) { PRINT_DEBUG("empty data ptr"); 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 BIODASDFMT: rc = dasd_ioctl_format(bdev, argp); break; case BIODASDINFO: rc = dasd_ioctl_information(block, cmd, argp); break; case BIODASDINFO2: rc = dasd_ioctl_information(block, cmd, argp); break; case BIODASDPRRD: rc = dasd_ioctl_read_profile(block, argp); break; case BIODASDPRRST: rc = dasd_ioctl_reset_profile(block); break; case BLKROSET: rc = dasd_ioctl_set_ro(bdev, argp); 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; default: /* if the discipline has an ioctl method try it. */ if (base->discipline->ioctl) { rc = base->discipline->ioctl(block, cmd, argp); if (rc == -ENOIOCTLCMD) rc = -EINVAL; } else rc = -EINVAL; } dasd_put_device(base); return rc; }