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OpenCloudOS-Kernel/drivers/s390/block/dasd_ioctl.c

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/*
* 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
*
* $Revision: 1.50 $
*
* i/o controls for the dasd driver.
*/
#include <linux/config.h>
#include <linux/interrupt.h>
#include <linux/major.h>
#include <linux/fs.h>
#include <linux/blkpg.h>
#include <asm/ccwdev.h>
#include <asm/uaccess.h>
/* This is ugly... */
#define PRINTK_HEADER "dasd_ioctl:"
#include "dasd_int.h"
/*
* SECTION: ioctl functions.
*/
static struct list_head dasd_ioctl_list = LIST_HEAD_INIT(dasd_ioctl_list);
/*
* Find the ioctl with number no.
*/
static struct dasd_ioctl *
dasd_find_ioctl(int no)
{
struct dasd_ioctl *ioctl;
list_for_each_entry (ioctl, &dasd_ioctl_list, list)
if (ioctl->no == no)
return ioctl;
return NULL;
}
/*
* Register ioctl with number no.
*/
int
dasd_ioctl_no_register(struct module *owner, int no, dasd_ioctl_fn_t handler)
{
struct dasd_ioctl *new;
if (dasd_find_ioctl(no))
return -EBUSY;
new = kmalloc(sizeof (struct dasd_ioctl), GFP_KERNEL);
if (new == NULL)
return -ENOMEM;
new->owner = owner;
new->no = no;
new->handler = handler;
list_add(&new->list, &dasd_ioctl_list);
return 0;
}
/*
* Deregister ioctl with number no.
*/
int
dasd_ioctl_no_unregister(struct module *owner, int no, dasd_ioctl_fn_t handler)
{
struct dasd_ioctl *old = dasd_find_ioctl(no);
if (old == NULL)
return -ENOENT;
if (old->no != no || old->handler != handler || owner != old->owner)
return -EINVAL;
list_del(&old->list);
kfree(old);
return 0;
}
int
dasd_ioctl(struct inode *inp, struct file *filp,
unsigned int no, unsigned long data)
{
struct block_device *bdev = inp->i_bdev;
struct dasd_device *device = bdev->bd_disk->private_data;
struct dasd_ioctl *ioctl;
const char *dir;
int rc;
if ((_IOC_DIR(no) != _IOC_NONE) && (data == 0)) {
PRINT_DEBUG("empty data ptr");
return -EINVAL;
}
dir = _IOC_DIR (no) == _IOC_NONE ? "0" :
_IOC_DIR (no) == _IOC_READ ? "r" :
_IOC_DIR (no) == _IOC_WRITE ? "w" :
_IOC_DIR (no) == (_IOC_READ | _IOC_WRITE) ? "rw" : "u";
DBF_DEV_EVENT(DBF_DEBUG, device,
"ioctl 0x%08x %s'0x%x'%d(%d) with data %8lx", no,
dir, _IOC_TYPE(no), _IOC_NR(no), _IOC_SIZE(no), data);
/* Search for ioctl no in the ioctl list. */
list_for_each_entry(ioctl, &dasd_ioctl_list, list) {
if (ioctl->no == no) {
/* Found a matching ioctl. Call it. */
if (!try_module_get(ioctl->owner))
continue;
rc = ioctl->handler(bdev, no, data);
module_put(ioctl->owner);
return rc;
}
}
/* No ioctl with number no. */
DBF_DEV_EVENT(DBF_INFO, device,
"unknown ioctl 0x%08x=%s'0x%x'%d(%d) data %8lx", no,
dir, _IOC_TYPE(no), _IOC_NR(no), _IOC_SIZE(no), data);
return -EINVAL;
}
long
dasd_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
int rval;
lock_kernel();
rval = dasd_ioctl(filp->f_dentry->d_inode, filp, cmd, arg);
unlock_kernel();
return (rval == -EINVAL) ? -ENOIOCTLCMD : rval;
}
static int
dasd_ioctl_api_version(struct block_device *bdev, int no, long args)
{
int ver = DASD_API_VERSION;
return put_user(ver, (int __user *) args);
}
/*
* Enable device.
* used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection
*/
static int
dasd_ioctl_enable(struct block_device *bdev, int no, long args)
{
struct dasd_device *device;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
device = bdev->bd_disk->private_data;
if (device == NULL)
return -ENODEV;
dasd_enable_device(device);
/* Formatting the dasd device can change the capacity. */
down(&bdev->bd_sem);
i_size_write(bdev->bd_inode, (loff_t)get_capacity(device->gdp) << 9);
up(&bdev->bd_sem);
return 0;
}
/*
* Disable device.
* Used by dasdfmt. Disable I/O operations but allow ioctls.
*/
static int
dasd_ioctl_disable(struct block_device *bdev, int no, long args)
{
struct dasd_device *device;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
device = bdev->bd_disk->private_data;
if (device == NULL)
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(device, DASD_STATE_BASIC);
/*
* Set i_size to zero, since read, write, etc. check against this
* value.
*/
down(&bdev->bd_sem);
i_size_write(bdev->bd_inode, 0);
up(&bdev->bd_sem);
return 0;
}
/*
* Quiesce device.
*/
static int
dasd_ioctl_quiesce(struct block_device *bdev, int no, long args)
{
struct dasd_device *device;
unsigned long flags;
if (!capable (CAP_SYS_ADMIN))
return -EACCES;
device = bdev->bd_disk->private_data;
if (device == NULL)
return -ENODEV;
DEV_MESSAGE (KERN_DEBUG, device, "%s",
"Quiesce IO on device");
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
device->stopped |= DASD_STOPPED_QUIESCE;
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
return 0;
}
/*
* Quiesce device.
*/
static int
dasd_ioctl_resume(struct block_device *bdev, int no, long args)
{
struct dasd_device *device;
unsigned long flags;
if (!capable (CAP_SYS_ADMIN))
return -EACCES;
device = bdev->bd_disk->private_data;
if (device == NULL)
return -ENODEV;
DEV_MESSAGE (KERN_DEBUG, device, "%s",
"resume IO on device");
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
device->stopped &= ~DASD_STOPPED_QUIESCE;
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
dasd_schedule_bh (device);
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_device * device, struct format_data_t * fdata)
{
struct dasd_ccw_req *cqr;
int rc;
if (device->discipline->format_device == NULL)
return -EPERM;
if (device->state != DASD_STATE_BASIC) {
DEV_MESSAGE(KERN_WARNING, device, "%s",
"dasd_format: device is not disabled! ");
return -EBUSY;
}
DBF_DEV_EVENT(DBF_NOTICE, device,
"formatting units %d to %d (%d B blocks) flags %d",
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(device->gdp, 0);
bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize);
bdput(bdev);
}
while (fdata->start_unit <= fdata->stop_unit) {
cqr = device->discipline->format_device(device, fdata);
if (IS_ERR(cqr))
return PTR_ERR(cqr);
rc = dasd_sleep_on_interruptible(cqr);
dasd_sfree_request(cqr, cqr->device);
if (rc) {
if (rc != -ERESTARTSYS)
DEV_MESSAGE(KERN_ERR, device,
" Formatting of unit %d failed "
"with rc = %d",
fdata->start_unit, rc);
return rc;
}
fdata->start_unit++;
}
return 0;
}
/*
* Format device.
*/
static int
dasd_ioctl_format(struct block_device *bdev, int no, long args)
{
struct dasd_device *device;
struct format_data_t fdata;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (!args)
return -EINVAL;
/* fdata == NULL is no longer a valid arg to dasd_format ! */
device = bdev->bd_disk->private_data;
if (device == NULL)
return -ENODEV;
if (device->features & DASD_FEATURE_READONLY)
return -EROFS;
if (copy_from_user(&fdata, (void __user *) args,
sizeof (struct format_data_t)))
return -EFAULT;
if (bdev != bdev->bd_contains) {
DEV_MESSAGE(KERN_WARNING, device, "%s",
"Cannot low-level format a partition");
return -EINVAL;
}
return dasd_format(device, &fdata);
}
#ifdef CONFIG_DASD_PROFILE
/*
* Reset device profile information
*/
static int
dasd_ioctl_reset_profile(struct block_device *bdev, int no, long args)
{
struct dasd_device *device;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
device = bdev->bd_disk->private_data;
if (device == NULL)
return -ENODEV;
memset(&device->profile, 0, sizeof (struct dasd_profile_info_t));
return 0;
}
/*
* Return device profile information
*/
static int
dasd_ioctl_read_profile(struct block_device *bdev, int no, long args)
{
struct dasd_device *device;
device = bdev->bd_disk->private_data;
if (device == NULL)
return -ENODEV;
if (dasd_profile_level == DASD_PROFILE_OFF)
return -EIO;
if (copy_to_user((long __user *) args, (long *) &device->profile,
sizeof (struct dasd_profile_info_t)))
return -EFAULT;
return 0;
}
#else
static int
dasd_ioctl_reset_profile(struct block_device *bdev, int no, long args)
{
return -ENOSYS;
}
static int
dasd_ioctl_read_profile(struct block_device *bdev, int no, long args)
{
return -ENOSYS;
}
#endif
/*
* Return dasd information. Used for BIODASDINFO and BIODASDINFO2.
*/
static int
dasd_ioctl_information(struct block_device *bdev, int no, long args)
{
struct dasd_device *device;
struct dasd_information2_t *dasd_info;
unsigned long flags;
int rc;
struct ccw_device *cdev;
device = bdev->bd_disk->private_data;
if (device == NULL)
return -ENODEV;
if (!device->discipline->fill_info)
return -EINVAL;
dasd_info = kmalloc(sizeof(struct dasd_information2_t), GFP_KERNEL);
if (dasd_info == NULL)
return -ENOMEM;
rc = device->discipline->fill_info(device, dasd_info);
if (rc) {
kfree(dasd_info);
return rc;
}
cdev = device->cdev;
dasd_info->devno = _ccw_device_get_device_number(device->cdev);
dasd_info->schid = _ccw_device_get_subchannel_number(device->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->open_count = atomic_read(&device->open_count);
dasd_info->status = device->state;
/*
* check if device is really formatted
* LDL / CDL was returned by 'fill_info'
*/
if ((device->state < DASD_STATE_READY) ||
(dasd_check_blocksize(device->bp_block)))
dasd_info->format = DASD_FORMAT_NONE;
dasd_info->features |=
((device->features & DASD_FEATURE_READONLY) != 0);
if (device->discipline)
memcpy(dasd_info->type, device->discipline->name, 4);
else
memcpy(dasd_info->type, "none", 4);
dasd_info->req_queue_len = 0;
dasd_info->chanq_len = 0;
if (device->request_queue->request_fn) {
struct list_head *l;
#ifdef DASD_EXTENDED_PROFILING
{
struct list_head *l;
spin_lock_irqsave(&device->lock, flags);
list_for_each(l, &device->request_queue->queue_head)
dasd_info->req_queue_len++;
spin_unlock_irqrestore(&device->lock, flags);
}
#endif /* DASD_EXTENDED_PROFILING */
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
list_for_each(l, &device->ccw_queue)
dasd_info->chanq_len++;
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev),
flags);
}
rc = 0;
if (copy_to_user((long __user *) args, (long *) dasd_info,
((no == (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, int no, long args)
{
struct dasd_device *device;
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 *) args))
return -EFAULT;
device = bdev->bd_disk->private_data;
if (device == NULL)
return -ENODEV;
set_disk_ro(bdev->bd_disk, intval);
rc = dasd_set_feature(device->cdev, DASD_FEATURE_READONLY, intval);
return rc;
}
/*
* List of static ioctls.
*/
static struct { int no; dasd_ioctl_fn_t fn; } dasd_ioctls[] =
{
{ BIODASDDISABLE, dasd_ioctl_disable },
{ BIODASDENABLE, dasd_ioctl_enable },
{ BIODASDQUIESCE, dasd_ioctl_quiesce },
{ BIODASDRESUME, dasd_ioctl_resume },
{ BIODASDFMT, dasd_ioctl_format },
{ BIODASDINFO, dasd_ioctl_information },
{ BIODASDINFO2, dasd_ioctl_information },
{ BIODASDPRRD, dasd_ioctl_read_profile },
{ BIODASDPRRST, dasd_ioctl_reset_profile },
{ BLKROSET, dasd_ioctl_set_ro },
{ DASDAPIVER, dasd_ioctl_api_version },
{ -1, NULL }
};
int
dasd_ioctl_init(void)
{
int i;
for (i = 0; dasd_ioctls[i].no != -1; i++)
dasd_ioctl_no_register(NULL, dasd_ioctls[i].no,
dasd_ioctls[i].fn);
return 0;
}
void
dasd_ioctl_exit(void)
{
int i;
for (i = 0; dasd_ioctls[i].no != -1; i++)
dasd_ioctl_no_unregister(NULL, dasd_ioctls[i].no,
dasd_ioctls[i].fn);
}
EXPORT_SYMBOL(dasd_ioctl_no_register);
EXPORT_SYMBOL(dasd_ioctl_no_unregister);
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