*
* 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/cmb.h>
#include <asm/uaccess.h>
/* This is ugly... */
#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(void __user *argp)
+dasd_ioctl_api_version(struct block_device *bdev, int no, long args)
{
int ver = DASD_API_VERSION;
- return put_user(ver, (int __user *)argp);
+ return put_user(ver, (int __user *) args);
}
/*
* used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection
*/
static int
-dasd_ioctl_enable(struct block_device *bdev)
+dasd_ioctl_enable(struct block_device *bdev, int no, long args)
{
- struct dasd_device *device = bdev->bd_disk->private_data;
+ 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. */
- mutex_lock(&bdev->bd_mutex);
+ down(&bdev->bd_sem);
i_size_write(bdev->bd_inode, (loff_t)get_capacity(device->gdp) << 9);
- mutex_unlock(&bdev->bd_mutex);
+ up(&bdev->bd_sem);
return 0;
}
* Used by dasdfmt. Disable I/O operations but allow ioctls.
*/
static int
-dasd_ioctl_disable(struct block_device *bdev)
+dasd_ioctl_disable(struct block_device *bdev, int no, long args)
{
- struct dasd_device *device = bdev->bd_disk->private_data;
+ 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
* Set i_size to zero, since read, write, etc. check against this
* value.
*/
- mutex_lock(&bdev->bd_mutex);
+ down(&bdev->bd_sem);
i_size_write(bdev->bd_inode, 0);
- mutex_unlock(&bdev->bd_mutex);
+ up(&bdev->bd_sem);
return 0;
}
* Quiesce device.
*/
static int
-dasd_ioctl_quiesce(struct dasd_device *device)
+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);
* Quiesce device.
*/
static int
-dasd_ioctl_resume(struct dasd_device *device)
+dasd_ioctl_resume(struct block_device *bdev, int no, long args)
{
+ struct dasd_device *device;
unsigned long flags;
-
- if (!capable (CAP_SYS_ADMIN))
+
+ 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);
* Format device.
*/
static int
-dasd_ioctl_format(struct block_device *bdev, void __user *argp)
+dasd_ioctl_format(struct block_device *bdev, int no, long args)
{
- struct dasd_device *device = bdev->bd_disk->private_data;
+ struct dasd_device *device;
struct format_data_t fdata;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
- if (!argp)
+ 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, argp, sizeof(struct format_data_t)))
+ 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",
* Reset device profile information
*/
static int
-dasd_ioctl_reset_profile(struct dasd_device *device)
+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 dasd_device *device, void __user *argp)
+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(argp, &device->profile,
+
+ 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 dasd_device *device)
+dasd_ioctl_reset_profile(struct block_device *bdev, int no, long args)
{
return -ENOSYS;
}
static int
-dasd_ioctl_read_profile(struct dasd_device *device, void __user *argp)
+dasd_ioctl_read_profile(struct block_device *bdev, int no, long args)
{
return -ENOSYS;
}
* Return dasd information. Used for BIODASDINFO and BIODASDINFO2.
*/
static int
-dasd_ioctl_information(struct dasd_device *device,
- unsigned int cmd, void __user *argp)
+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 = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL);
+ dasd_info = kmalloc(sizeof(struct dasd_information2_t), GFP_KERNEL);
if (dasd_info == NULL)
return -ENOMEM;
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'
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
}
rc = 0;
- if (copy_to_user(argp, dasd_info,
- ((cmd == (unsigned int) BIODASDINFO2) ?
+ 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;
* Set read only
*/
static int
-dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp)
+dasd_ioctl_set_ro(struct block_device *bdev, int no, long args)
{
- struct dasd_device *device = bdev->bd_disk->private_data;
- int intval;
+ 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 *)argp))
+ 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);
- return dasd_set_feature(device->cdev, DASD_FEATURE_READONLY, intval);
+ rc = dasd_set_feature(device->cdev, DASD_FEATURE_READONLY, intval);
+
+ return rc;
}
-static int
-dasd_ioctl_readall_cmb(struct dasd_device *device, unsigned int cmd,
- unsigned long arg)
+/*
+ * List of static ioctls.
+ */
+static struct { int no; dasd_ioctl_fn_t fn; } dasd_ioctls[] =
{
- 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;
-}
+ { 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(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
+dasd_ioctl_init(void)
{
- 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;
- }
+ int i;
- 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;
- }
+ for (i = 0; dasd_ioctls[i].no != -1; i++)
+ dasd_ioctl_no_register(NULL, dasd_ioctls[i].no,
+ dasd_ioctls[i].fn);
+ return 0;
- return -EINVAL;
- }
}
-long
-dasd_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+void
+dasd_ioctl_exit(void)
{
- int rval;
+ int i;
- lock_kernel();
- rval = dasd_ioctl(filp->f_dentry->d_inode, filp, cmd, arg);
- unlock_kernel();
+ for (i = 0; dasd_ioctls[i].no != -1; i++)
+ dasd_ioctl_no_unregister(NULL, dasd_ioctls[i].no,
+ dasd_ioctls[i].fn);
- return (rval == -EINVAL) ? -ENOIOCTLCMD : rval;
}
+
+EXPORT_SYMBOL(dasd_ioctl_no_register);
+EXPORT_SYMBOL(dasd_ioctl_no_unregister);
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