swh:1:snp:c2847dfd741eae21606027cf29250d1ebcd63fb4
Tip revision: e0f2e3a06be513352cb4955313ed7e55909acd84 authored by Linus Torvalds on 25 March 2007, 22:56:23 UTC
Linux 2.6.21-rc5
Linux 2.6.21-rc5
Tip revision: e0f2e3a
dasd_ioctl.c
/*
* 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.
*/
#include <linux/interrupt.h>
#include <linux/major.h>
#include <linux/fs.h>
#include <linux/blkpg.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_device *device = bdev->bd_disk->private_data;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
dasd_enable_device(device);
/* Formatting the dasd device can change the capacity. */
mutex_lock(&bdev->bd_mutex);
i_size_write(bdev->bd_inode, (loff_t)get_capacity(device->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_device *device = 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(device, 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_device *device)
{
unsigned long flags;
if (!capable (CAP_SYS_ADMIN))
return -EACCES;
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 dasd_device *device)
{
unsigned long flags;
if (!capable (CAP_SYS_ADMIN))
return -EACCES;
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, void __user *argp)
{
struct dasd_device *device = bdev->bd_disk->private_data;
struct format_data_t fdata;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (!argp)
return -EINVAL;
if (device->features & DASD_FEATURE_READONLY)
return -EROFS;
if (copy_from_user(&fdata, argp, 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 dasd_device *device)
{
memset(&device->profile, 0, sizeof (struct dasd_profile_info_t));
return 0;
}
/*
* Return device profile information
*/
static int
dasd_ioctl_read_profile(struct dasd_device *device, void __user *argp)
{
if (dasd_profile_level == DASD_PROFILE_OFF)
return -EIO;
if (copy_to_user(argp, &device->profile,
sizeof (struct dasd_profile_info_t)))
return -EFAULT;
return 0;
}
#else
static int
dasd_ioctl_reset_profile(struct dasd_device *device)
{
return -ENOSYS;
}
static int
dasd_ioctl_read_profile(struct dasd_device *device, void __user *argp)
{
return -ENOSYS;
}
#endif
/*
* Return dasd information. Used for BIODASDINFO and BIODASDINFO2.
*/
static int
dasd_ioctl_information(struct dasd_device *device,
unsigned int cmd, void __user *argp)
{
struct dasd_information2_t *dasd_info;
unsigned long flags;
int rc;
struct ccw_device *cdev;
if (!device->discipline->fill_info)
return -EINVAL;
dasd_info = kzalloc(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->status = device->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(&device->open_count);
if (!device->bdev)
dasd_info->open_count++;
/*
* 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);
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(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 *device = 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(device->cdev, DASD_FEATURE_READONLY, intval);
}
static int
dasd_ioctl_readall_cmb(struct dasd_device *device, 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(device->cdev, &data);
if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp))))
return -EFAULT;
return ret;
}
int
dasd_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct block_device *bdev = inode->i_bdev;
struct dasd_device *device = bdev->bd_disk->private_data;
void __user *argp = (void __user *)arg;
if (!device)
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(device);
case BIODASDRESUME:
return dasd_ioctl_resume(device);
case BIODASDFMT:
return dasd_ioctl_format(bdev, argp);
case BIODASDINFO:
return dasd_ioctl_information(device, cmd, argp);
case BIODASDINFO2:
return dasd_ioctl_information(device, cmd, argp);
case BIODASDPRRD:
return dasd_ioctl_read_profile(device, argp);
case BIODASDPRRST:
return dasd_ioctl_reset_profile(device);
case BLKROSET:
return dasd_ioctl_set_ro(bdev, argp);
case DASDAPIVER:
return dasd_ioctl_api_version(argp);
case BIODASDCMFENABLE:
return enable_cmf(device->cdev);
case BIODASDCMFDISABLE:
return disable_cmf(device->cdev);
case BIODASDREADALLCMB:
return dasd_ioctl_readall_cmb(device, cmd, arg);
default:
/* if the discipline has an ioctl method try it. */
if (device->discipline->ioctl) {
int rval = device->discipline->ioctl(device, cmd, argp);
if (rval != -ENOIOCTLCMD)
return rval;
}
return -EINVAL;
}
}
long
dasd_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
int rval;
lock_kernel();
rval = dasd_ioctl(filp->f_path.dentry->d_inode, filp, cmd, arg);
unlock_kernel();
return (rval == -EINVAL) ? -ENOIOCTLCMD : rval;
}