| /* |
| * File...........: linux/drivers/s390/block/dasd_ioctl.c |
| * 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> |
| * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001 |
| * |
| * i/o controls for the dasd driver. |
| */ |
| |
| #define KMSG_COMPONENT "dasd" |
| |
| #include <linux/interrupt.h> |
| #include <linux/major.h> |
| #include <linux/fs.h> |
| #include <linux/blkpg.h> |
| #include <linux/smp_lock.h> |
| |
| #include <asm/ccwdev.h> |
| #include <asm/cmb.h> |
| #include <asm/uaccess.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_block *block = bdev->bd_disk->private_data; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EACCES; |
| |
| dasd_enable_device(block->base); |
| /* Formatting the dasd device can change the capacity. */ |
| mutex_lock(&bdev->bd_mutex); |
| i_size_write(bdev->bd_inode, (loff_t)get_capacity(block->gdp) << 9); |
| mutex_unlock(&bdev->bd_mutex); |
| 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_block *block = bdev->bd_disk->private_data; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EACCES; |
| |
| /* |
| * 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(block->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); |
| 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_block *block = bdev->bd_disk->private_data; |
| struct format_data_t fdata; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EACCES; |
| if (!argp) |
| return -EINVAL; |
| |
| if (block->base->features & DASD_FEATURE_READONLY) |
| return -EROFS; |
| if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) |
| return -EFAULT; |
| if (bdev != bdev->bd_contains) { |
| pr_warning("%s: The specified DASD is a partition and cannot " |
| "be formatted\n", |
| dev_name(&block->base->cdev->dev)); |
| return -EINVAL; |
| } |
| return dasd_format(block, &fdata); |
| } |
| |
| #ifdef CONFIG_DASD_PROFILE |
| /* |
| * Reset device profile information |
| */ |
| static int dasd_ioctl_reset_profile(struct dasd_block *block) |
| { |
| memset(&block->profile, 0, sizeof(struct dasd_profile_info_t)); |
| return 0; |
| } |
| |
| /* |
| * Return device profile information |
| */ |
| static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp) |
| { |
| if (dasd_profile_level == DASD_PROFILE_OFF) |
| return -EIO; |
| if (copy_to_user(argp, &block->profile, |
| sizeof(struct dasd_profile_info_t))) |
| return -EFAULT; |
| return 0; |
| } |
| #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->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); |
| |
| if (base->discipline) |
| memcpy(dasd_info->type, base->discipline->name, 4); |
| else |
| memcpy(dasd_info->type, "none", 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_block *block = bdev->bd_disk->private_data; |
| int intval; |
| |
| 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; |
| |
| set_disk_ro(bdev->bd_disk, intval); |
| return dasd_set_feature(block->base->cdev, DASD_FEATURE_READONLY, intval); |
| } |
| |
| static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd, |
| unsigned long arg) |
| { |
| struct cmbdata __user *argp = (void __user *) arg; |
| 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; |
| } |
| |
| static int |
| dasd_do_ioctl(struct block_device *bdev, fmode_t mode, |
| unsigned int cmd, unsigned long arg) |
| { |
| struct dasd_block *block = bdev->bd_disk->private_data; |
| void __user *argp = (void __user *)arg; |
| |
| if (!block) |
| return -ENODEV; |
| |
| if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) { |
| PRINT_DEBUG("empty data ptr"); |
| return -EINVAL; |
| } |
| |
| switch (cmd) { |
| case BIODASDDISABLE: |
| return dasd_ioctl_disable(bdev); |
| case BIODASDENABLE: |
| return dasd_ioctl_enable(bdev); |
| case BIODASDQUIESCE: |
| return dasd_ioctl_quiesce(block); |
| case BIODASDRESUME: |
| return dasd_ioctl_resume(block); |
| case BIODASDFMT: |
| return dasd_ioctl_format(bdev, argp); |
| case BIODASDINFO: |
| return dasd_ioctl_information(block, cmd, argp); |
| case BIODASDINFO2: |
| return dasd_ioctl_information(block, cmd, argp); |
| case BIODASDPRRD: |
| return dasd_ioctl_read_profile(block, argp); |
| case BIODASDPRRST: |
| return dasd_ioctl_reset_profile(block); |
| case BLKROSET: |
| return dasd_ioctl_set_ro(bdev, argp); |
| case DASDAPIVER: |
| return dasd_ioctl_api_version(argp); |
| case BIODASDCMFENABLE: |
| return enable_cmf(block->base->cdev); |
| case BIODASDCMFDISABLE: |
| return disable_cmf(block->base->cdev); |
| case BIODASDREADALLCMB: |
| return dasd_ioctl_readall_cmb(block, cmd, arg); |
| default: |
| /* if the discipline has an ioctl method try it. */ |
| if (block->base->discipline->ioctl) { |
| int rval = block->base->discipline->ioctl(block, cmd, argp); |
| if (rval != -ENOIOCTLCMD) |
| return rval; |
| } |
| |
| return -EINVAL; |
| } |
| } |
| |
| int dasd_ioctl(struct block_device *bdev, fmode_t mode, |
| unsigned int cmd, unsigned long arg) |
| { |
| int rc; |
| |
| lock_kernel(); |
| rc = dasd_do_ioctl(bdev, mode, cmd, arg); |
| unlock_kernel(); |
| return rc; |
| } |