// SPDX-License-Identifier: GPL-2.0
/*
* Author(s)......: Holger Smolinski <[email protected]>
* Horst Hummel <[email protected]>
* Carsten Otte <[email protected]>
* Martin Schwidefsky <[email protected]>
* Bugreports.to..: <[email protected]>
* Copyright IBM Corp. 1999, 2001
*
* i/o controls for the dasd driver.
*/
#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>
#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_mapping->host->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;
}
/*
* Swap driver iternal copy relation.
*/
static int
dasd_ioctl_copy_pair_swap(struct block_device *bdev, void __user *argp)
{
struct dasd_copypair_swap_data_t data;
struct dasd_device *device;
int rc;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
device = dasd_device_from_gendisk(bdev->bd_disk);
if (!device)
return -ENODEV;
if (copy_from_user(&data, argp, sizeof(struct dasd_copypair_swap_data_t))) {
dasd_put_device(device);
return -EFAULT;
}
if (memchr_inv(data.reserved, 0, sizeof(data.reserved))) {
pr_warn("%s: Invalid swap data specified\n",
dev_name(&device->cdev->dev));
dasd_put_device(device);
return DASD_COPYPAIRSWAP_INVALID;
}
if (bdev_is_partition(bdev)) {
pr_warn("%s: The specified DASD is a partition and cannot be swapped\n",
dev_name(&device->cdev->dev));
dasd_put_device(device);
return DASD_COPYPAIRSWAP_INVALID;
}
if (!device->copy) {
pr_warn("%s: The specified DASD has no copy pair set up\n",
dev_name(&device->cdev->dev));
dasd_put_device(device);
return -ENODEV;
}
if (!device->discipline->copy_pair_swap) {
dasd_put_device(device);
return -EOPNOTSUPP;
}
rc = device->discipline->copy_pair_swap(device, data.primary,
data.secondary);
dasd_put_device(device);
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_file)
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, blk_mode_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;
case BIODASDCOPYPAIRSWAP:
rc = dasd_ioctl_copy_pair_swap(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);
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