From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- drivers/s390/block/dasd_ioctl.c | 579 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 579 insertions(+) create mode 100644 drivers/s390/block/dasd_ioctl.c (limited to 'drivers/s390/block/dasd_ioctl.c') diff --git a/drivers/s390/block/dasd_ioctl.c b/drivers/s390/block/dasd_ioctl.c new file mode 100644 index 000000000..02837d0ad --- /dev/null +++ b/drivers/s390/block/dasd_ioctl.c @@ -0,0 +1,579 @@ +/* + * 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); + /* 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; +} + +/* + * 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 enable_pav = 1; + int rc, retries; + int start, stop; + + 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) { + struct block_device *bdev = bdget_disk(block->gdp, 0); + bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize); + bdput(bdev); + } + + retries = 255; + /* backup start- and endtrack for retries */ + start = fdata->start_unit; + stop = fdata->stop_unit; + do { + rc = base->discipline->format_device(base, fdata, enable_pav); + if (rc) { + if (rc == -EAGAIN) { + retries--; + /* disable PAV in case of errors */ + enable_pav = 0; + fdata->start_unit = start; + fdata->stop_unit = stop; + } else + return rc; + } else + /* success */ + break; + } while (retries); + + if (!retries) + return -EIO; + else + 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 -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, + unsigned int cmd, void __user *argp) +{ + 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; + unsigned long flags; + int rc; + + 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); + 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); + + 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 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 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. */ + rc = -ENOTTY; + if (base->discipline->ioctl) + rc = base->discipline->ioctl(block, cmd, argp); + } + dasd_put_device(base); + return rc; +} -- cgit v1.2.3-54-g00ecf