mirror of https://gitee.com/openkylin/linux.git
438 lines
11 KiB
C
438 lines
11 KiB
C
/*
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* File...........: linux/drivers/s390/block/dasd_ioctl.c
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* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
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* Horst Hummel <Horst.Hummel@de.ibm.com>
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* Carsten Otte <Cotte@de.ibm.com>
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* Martin Schwidefsky <schwidefsky@de.ibm.com>
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* Bugreports.to..: <Linux390@de.ibm.com>
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* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001
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*
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* i/o controls for the dasd driver.
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*/
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#include <linux/interrupt.h>
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#include <linux/major.h>
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#include <linux/fs.h>
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#include <linux/blkpg.h>
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#include <asm/ccwdev.h>
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#include <asm/cmb.h>
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#include <asm/uaccess.h>
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/* This is ugly... */
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#define PRINTK_HEADER "dasd_ioctl:"
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#include "dasd_int.h"
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static int
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dasd_ioctl_api_version(void __user *argp)
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{
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int ver = DASD_API_VERSION;
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return put_user(ver, (int __user *)argp);
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}
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/*
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* Enable device.
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* used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection
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*/
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static int
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dasd_ioctl_enable(struct block_device *bdev)
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{
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struct dasd_device *device = bdev->bd_disk->private_data;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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dasd_enable_device(device);
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/* Formatting the dasd device can change the capacity. */
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mutex_lock(&bdev->bd_mutex);
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i_size_write(bdev->bd_inode, (loff_t)get_capacity(device->gdp) << 9);
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mutex_unlock(&bdev->bd_mutex);
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return 0;
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}
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/*
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* Disable device.
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* Used by dasdfmt. Disable I/O operations but allow ioctls.
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*/
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static int
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dasd_ioctl_disable(struct block_device *bdev)
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{
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struct dasd_device *device = bdev->bd_disk->private_data;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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/*
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* Man this is sick. We don't do a real disable but only downgrade
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* the device to DASD_STATE_BASIC. The reason is that dasdfmt uses
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* BIODASDDISABLE to disable accesses to the device via the block
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* device layer but it still wants to do i/o on the device by
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* using the BIODASDFMT ioctl. Therefore the correct state for the
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* device is DASD_STATE_BASIC that allows to do basic i/o.
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*/
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dasd_set_target_state(device, DASD_STATE_BASIC);
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/*
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* Set i_size to zero, since read, write, etc. check against this
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* value.
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*/
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mutex_lock(&bdev->bd_mutex);
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i_size_write(bdev->bd_inode, 0);
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mutex_unlock(&bdev->bd_mutex);
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return 0;
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}
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/*
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* Quiesce device.
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*/
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static int
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dasd_ioctl_quiesce(struct dasd_device *device)
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{
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unsigned long flags;
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if (!capable (CAP_SYS_ADMIN))
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return -EACCES;
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DEV_MESSAGE (KERN_DEBUG, device, "%s",
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"Quiesce IO on device");
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spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
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device->stopped |= DASD_STOPPED_QUIESCE;
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spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
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return 0;
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}
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/*
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* Quiesce device.
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*/
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static int
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dasd_ioctl_resume(struct dasd_device *device)
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{
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unsigned long flags;
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if (!capable (CAP_SYS_ADMIN))
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return -EACCES;
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DEV_MESSAGE (KERN_DEBUG, device, "%s",
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"resume IO on device");
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spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
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device->stopped &= ~DASD_STOPPED_QUIESCE;
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spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
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dasd_schedule_bh (device);
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return 0;
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}
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/*
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* performs formatting of _device_ according to _fdata_
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* Note: The discipline's format_function is assumed to deliver formatting
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* commands to format a single unit of the device. In terms of the ECKD
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* devices this means CCWs are generated to format a single track.
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*/
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static int
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dasd_format(struct dasd_device * device, struct format_data_t * fdata)
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{
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struct dasd_ccw_req *cqr;
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int rc;
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if (device->discipline->format_device == NULL)
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return -EPERM;
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if (device->state != DASD_STATE_BASIC) {
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DEV_MESSAGE(KERN_WARNING, device, "%s",
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"dasd_format: device is not disabled! ");
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return -EBUSY;
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}
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DBF_DEV_EVENT(DBF_NOTICE, device,
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"formatting units %d to %d (%d B blocks) flags %d",
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fdata->start_unit,
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fdata->stop_unit, fdata->blksize, fdata->intensity);
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/* Since dasdfmt keeps the device open after it was disabled,
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* there still exists an inode for this device.
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* We must update i_blkbits, otherwise we might get errors when
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* enabling the device later.
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*/
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if (fdata->start_unit == 0) {
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struct block_device *bdev = bdget_disk(device->gdp, 0);
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bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize);
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bdput(bdev);
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}
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while (fdata->start_unit <= fdata->stop_unit) {
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cqr = device->discipline->format_device(device, fdata);
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if (IS_ERR(cqr))
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return PTR_ERR(cqr);
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rc = dasd_sleep_on_interruptible(cqr);
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dasd_sfree_request(cqr, cqr->device);
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if (rc) {
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if (rc != -ERESTARTSYS)
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DEV_MESSAGE(KERN_ERR, device,
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" Formatting of unit %d failed "
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"with rc = %d",
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fdata->start_unit, rc);
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return rc;
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}
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fdata->start_unit++;
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}
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return 0;
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}
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/*
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* Format device.
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*/
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static int
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dasd_ioctl_format(struct block_device *bdev, void __user *argp)
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{
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struct dasd_device *device = bdev->bd_disk->private_data;
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struct format_data_t fdata;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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if (!argp)
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return -EINVAL;
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if (device->features & DASD_FEATURE_READONLY)
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return -EROFS;
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if (copy_from_user(&fdata, argp, sizeof(struct format_data_t)))
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return -EFAULT;
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if (bdev != bdev->bd_contains) {
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DEV_MESSAGE(KERN_WARNING, device, "%s",
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"Cannot low-level format a partition");
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return -EINVAL;
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}
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return dasd_format(device, &fdata);
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}
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#ifdef CONFIG_DASD_PROFILE
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/*
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* Reset device profile information
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*/
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static int
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dasd_ioctl_reset_profile(struct dasd_device *device)
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{
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memset(&device->profile, 0, sizeof (struct dasd_profile_info_t));
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return 0;
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}
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/*
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* Return device profile information
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*/
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static int
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dasd_ioctl_read_profile(struct dasd_device *device, void __user *argp)
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{
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if (dasd_profile_level == DASD_PROFILE_OFF)
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return -EIO;
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if (copy_to_user(argp, &device->profile,
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sizeof (struct dasd_profile_info_t)))
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return -EFAULT;
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return 0;
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}
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#else
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static int
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dasd_ioctl_reset_profile(struct dasd_device *device)
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{
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return -ENOSYS;
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}
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static int
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dasd_ioctl_read_profile(struct dasd_device *device, void __user *argp)
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{
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return -ENOSYS;
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}
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#endif
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/*
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* Return dasd information. Used for BIODASDINFO and BIODASDINFO2.
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*/
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static int
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dasd_ioctl_information(struct dasd_device *device,
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unsigned int cmd, void __user *argp)
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{
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struct dasd_information2_t *dasd_info;
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unsigned long flags;
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int rc;
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struct ccw_device *cdev;
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if (!device->discipline->fill_info)
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return -EINVAL;
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dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL);
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if (dasd_info == NULL)
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return -ENOMEM;
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rc = device->discipline->fill_info(device, dasd_info);
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if (rc) {
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kfree(dasd_info);
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return rc;
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}
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cdev = device->cdev;
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dasd_info->devno = _ccw_device_get_device_number(device->cdev);
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dasd_info->schid = _ccw_device_get_subchannel_number(device->cdev);
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dasd_info->cu_type = cdev->id.cu_type;
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dasd_info->cu_model = cdev->id.cu_model;
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dasd_info->dev_type = cdev->id.dev_type;
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dasd_info->dev_model = cdev->id.dev_model;
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dasd_info->status = device->state;
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/*
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* The open_count is increased for every opener, that includes
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* the blkdev_get in dasd_scan_partitions.
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* This must be hidden from user-space.
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*/
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dasd_info->open_count = atomic_read(&device->open_count);
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if (!device->bdev)
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dasd_info->open_count++;
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/*
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* check if device is really formatted
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* LDL / CDL was returned by 'fill_info'
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*/
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if ((device->state < DASD_STATE_READY) ||
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(dasd_check_blocksize(device->bp_block)))
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dasd_info->format = DASD_FORMAT_NONE;
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dasd_info->features |=
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((device->features & DASD_FEATURE_READONLY) != 0);
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if (device->discipline)
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memcpy(dasd_info->type, device->discipline->name, 4);
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else
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memcpy(dasd_info->type, "none", 4);
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if (device->request_queue->request_fn) {
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struct list_head *l;
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#ifdef DASD_EXTENDED_PROFILING
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{
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struct list_head *l;
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spin_lock_irqsave(&device->lock, flags);
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list_for_each(l, &device->request_queue->queue_head)
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dasd_info->req_queue_len++;
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spin_unlock_irqrestore(&device->lock, flags);
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}
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#endif /* DASD_EXTENDED_PROFILING */
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spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
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list_for_each(l, &device->ccw_queue)
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dasd_info->chanq_len++;
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spin_unlock_irqrestore(get_ccwdev_lock(device->cdev),
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flags);
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}
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rc = 0;
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if (copy_to_user(argp, dasd_info,
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((cmd == (unsigned int) BIODASDINFO2) ?
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sizeof (struct dasd_information2_t) :
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sizeof (struct dasd_information_t))))
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rc = -EFAULT;
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kfree(dasd_info);
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return rc;
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}
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/*
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* Set read only
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*/
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static int
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dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp)
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{
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struct dasd_device *device = bdev->bd_disk->private_data;
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int intval;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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if (bdev != bdev->bd_contains)
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// ro setting is not allowed for partitions
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return -EINVAL;
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if (get_user(intval, (int __user *)argp))
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return -EFAULT;
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set_disk_ro(bdev->bd_disk, intval);
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return dasd_set_feature(device->cdev, DASD_FEATURE_READONLY, intval);
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}
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static int
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dasd_ioctl_readall_cmb(struct dasd_device *device, unsigned int cmd,
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unsigned long arg)
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{
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struct cmbdata __user *argp = (void __user *) arg;
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size_t size = _IOC_SIZE(cmd);
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struct cmbdata data;
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int ret;
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ret = cmf_readall(device->cdev, &data);
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if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp))))
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return -EFAULT;
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return ret;
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}
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int
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dasd_ioctl(struct inode *inode, struct file *file,
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unsigned int cmd, unsigned long arg)
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{
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struct block_device *bdev = inode->i_bdev;
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struct dasd_device *device = bdev->bd_disk->private_data;
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void __user *argp = (void __user *)arg;
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if (!device)
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return -ENODEV;
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if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) {
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PRINT_DEBUG("empty data ptr");
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return -EINVAL;
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}
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switch (cmd) {
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case BIODASDDISABLE:
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return dasd_ioctl_disable(bdev);
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case BIODASDENABLE:
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return dasd_ioctl_enable(bdev);
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case BIODASDQUIESCE:
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return dasd_ioctl_quiesce(device);
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case BIODASDRESUME:
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return dasd_ioctl_resume(device);
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case BIODASDFMT:
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return dasd_ioctl_format(bdev, argp);
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case BIODASDINFO:
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return dasd_ioctl_information(device, cmd, argp);
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case BIODASDINFO2:
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return dasd_ioctl_information(device, cmd, argp);
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case BIODASDPRRD:
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return dasd_ioctl_read_profile(device, argp);
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case BIODASDPRRST:
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return dasd_ioctl_reset_profile(device);
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case BLKROSET:
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return dasd_ioctl_set_ro(bdev, argp);
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case DASDAPIVER:
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return dasd_ioctl_api_version(argp);
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case BIODASDCMFENABLE:
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return enable_cmf(device->cdev);
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case BIODASDCMFDISABLE:
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return disable_cmf(device->cdev);
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case BIODASDREADALLCMB:
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return dasd_ioctl_readall_cmb(device, cmd, arg);
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default:
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/* if the discipline has an ioctl method try it. */
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if (device->discipline->ioctl) {
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int rval = device->discipline->ioctl(device, cmd, argp);
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if (rval != -ENOIOCTLCMD)
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return rval;
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}
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return -EINVAL;
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}
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}
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long
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dasd_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
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{
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int rval;
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lock_kernel();
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rval = dasd_ioctl(filp->f_path.dentry->d_inode, filp, cmd, arg);
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unlock_kernel();
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return (rval == -EINVAL) ? -ENOIOCTLCMD : rval;
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}
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