mirror of https://gitee.com/openkylin/linux.git
696 lines
17 KiB
C
696 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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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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* Copyright IBM Corp. 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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#define KMSG_COMPONENT "dasd"
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#include <linux/interrupt.h>
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#include <linux/compat.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 <linux/slab.h>
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#include <asm/ccwdev.h>
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#include <asm/schid.h>
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#include <asm/cmb.h>
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#include <linux/uaccess.h>
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#include <linux/dasd_mod.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 *base;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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base = dasd_device_from_gendisk(bdev->bd_disk);
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if (!base)
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return -ENODEV;
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dasd_enable_device(base);
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/* Formatting the dasd device can change the capacity. */
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bd_set_nr_sectors(bdev, get_capacity(base->block->gdp));
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dasd_put_device(base);
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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 *base;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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base = dasd_device_from_gendisk(bdev->bd_disk);
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if (!base)
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return -ENODEV;
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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(base, 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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bd_set_nr_sectors(bdev, 0);
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dasd_put_device(base);
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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 dasd_ioctl_quiesce(struct dasd_block *block)
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{
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unsigned long flags;
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struct dasd_device *base;
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base = block->base;
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if (!capable (CAP_SYS_ADMIN))
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return -EACCES;
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pr_info("%s: The DASD has been put in the quiesce "
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"state\n", dev_name(&base->cdev->dev));
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spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
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dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
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spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
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return 0;
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}
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/*
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* Resume device.
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*/
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static int dasd_ioctl_resume(struct dasd_block *block)
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{
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unsigned long flags;
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struct dasd_device *base;
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base = block->base;
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if (!capable (CAP_SYS_ADMIN))
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return -EACCES;
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pr_info("%s: I/O operations have been resumed "
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"on the DASD\n", dev_name(&base->cdev->dev));
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spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
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dasd_device_remove_stop_bits(base, DASD_STOPPED_QUIESCE);
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spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
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dasd_schedule_block_bh(block);
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return 0;
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}
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/*
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* Abort all failfast I/O on a device.
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*/
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static int dasd_ioctl_abortio(struct dasd_block *block)
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{
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unsigned long flags;
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struct dasd_device *base;
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struct dasd_ccw_req *cqr, *n;
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base = block->base;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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if (test_and_set_bit(DASD_FLAG_ABORTALL, &base->flags))
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return 0;
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DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag set");
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spin_lock_irqsave(&block->request_queue_lock, flags);
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spin_lock(&block->queue_lock);
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list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
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if (test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
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cqr->callback_data &&
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cqr->callback_data != DASD_SLEEPON_START_TAG &&
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cqr->callback_data != DASD_SLEEPON_END_TAG) {
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spin_unlock(&block->queue_lock);
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blk_abort_request(cqr->callback_data);
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spin_lock(&block->queue_lock);
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}
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}
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spin_unlock(&block->queue_lock);
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spin_unlock_irqrestore(&block->request_queue_lock, flags);
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dasd_schedule_block_bh(block);
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return 0;
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}
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/*
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* Allow I/O on a device
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*/
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static int dasd_ioctl_allowio(struct dasd_block *block)
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{
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struct dasd_device *base;
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base = block->base;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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if (test_and_clear_bit(DASD_FLAG_ABORTALL, &base->flags))
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DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag unset");
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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 multiple units of the device. In terms of the ECKD
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* devices this means CCWs are generated to format multiple tracks.
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*/
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static int
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dasd_format(struct dasd_block *block, struct format_data_t *fdata)
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{
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struct dasd_device *base;
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int rc;
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base = block->base;
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if (base->discipline->format_device == NULL)
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return -EPERM;
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if (base->state != DASD_STATE_BASIC) {
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pr_warn("%s: The DASD cannot be formatted while it is enabled\n",
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dev_name(&base->cdev->dev));
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return -EBUSY;
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}
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DBF_DEV_EVENT(DBF_NOTICE, base,
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"formatting units %u to %u (%u B blocks) flags %u",
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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(block->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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rc = base->discipline->format_device(base, fdata, 1);
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if (rc == -EAGAIN)
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rc = base->discipline->format_device(base, fdata, 0);
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return rc;
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}
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static int dasd_check_format(struct dasd_block *block,
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struct format_check_t *cdata)
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{
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struct dasd_device *base;
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int rc;
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base = block->base;
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if (!base->discipline->check_device_format)
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return -ENOTTY;
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rc = base->discipline->check_device_format(base, cdata, 1);
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if (rc == -EAGAIN)
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rc = base->discipline->check_device_format(base, cdata, 0);
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return rc;
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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 *base;
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struct format_data_t fdata;
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int rc;
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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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base = dasd_device_from_gendisk(bdev->bd_disk);
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if (!base)
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return -ENODEV;
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if (base->features & DASD_FEATURE_READONLY ||
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test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
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dasd_put_device(base);
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return -EROFS;
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}
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if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) {
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dasd_put_device(base);
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return -EFAULT;
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}
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if (bdev_is_partition(bdev)) {
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pr_warn("%s: The specified DASD is a partition and cannot be formatted\n",
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dev_name(&base->cdev->dev));
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dasd_put_device(base);
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return -EINVAL;
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}
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rc = dasd_format(base->block, &fdata);
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dasd_put_device(base);
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return rc;
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}
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/*
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* Check device format
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*/
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static int dasd_ioctl_check_format(struct block_device *bdev, void __user *argp)
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{
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struct format_check_t cdata;
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struct dasd_device *base;
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int rc = 0;
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if (!argp)
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return -EINVAL;
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base = dasd_device_from_gendisk(bdev->bd_disk);
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if (!base)
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return -ENODEV;
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if (bdev_is_partition(bdev)) {
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pr_warn("%s: The specified DASD is a partition and cannot be checked\n",
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dev_name(&base->cdev->dev));
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rc = -EINVAL;
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goto out_err;
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}
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if (copy_from_user(&cdata, argp, sizeof(cdata))) {
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rc = -EFAULT;
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goto out_err;
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}
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rc = dasd_check_format(base->block, &cdata);
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if (rc)
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goto out_err;
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if (copy_to_user(argp, &cdata, sizeof(cdata)))
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rc = -EFAULT;
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out_err:
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dasd_put_device(base);
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return rc;
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}
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static int dasd_release_space(struct dasd_device *device,
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struct format_data_t *rdata)
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{
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if (!device->discipline->is_ese && !device->discipline->is_ese(device))
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return -ENOTSUPP;
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if (!device->discipline->release_space)
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return -ENOTSUPP;
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return device->discipline->release_space(device, rdata);
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}
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/*
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* Release allocated space
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*/
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static int dasd_ioctl_release_space(struct block_device *bdev, void __user *argp)
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{
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struct format_data_t rdata;
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struct dasd_device *base;
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int rc = 0;
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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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base = dasd_device_from_gendisk(bdev->bd_disk);
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if (!base)
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return -ENODEV;
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if (base->features & DASD_FEATURE_READONLY ||
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test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
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rc = -EROFS;
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goto out_err;
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}
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if (bdev_is_partition(bdev)) {
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pr_warn("%s: The specified DASD is a partition and tracks cannot be released\n",
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dev_name(&base->cdev->dev));
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rc = -EINVAL;
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goto out_err;
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}
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if (copy_from_user(&rdata, argp, sizeof(rdata))) {
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rc = -EFAULT;
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goto out_err;
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}
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rc = dasd_release_space(base, &rdata);
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out_err:
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dasd_put_device(base);
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return rc;
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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 dasd_ioctl_reset_profile(struct dasd_block *block)
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{
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dasd_profile_reset(&block->profile);
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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 dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
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{
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struct dasd_profile_info_t *data;
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int rc = 0;
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data = kmalloc(sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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spin_lock_bh(&block->profile.lock);
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if (block->profile.data) {
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data->dasd_io_reqs = block->profile.data->dasd_io_reqs;
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data->dasd_io_sects = block->profile.data->dasd_io_sects;
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memcpy(data->dasd_io_secs, block->profile.data->dasd_io_secs,
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sizeof(data->dasd_io_secs));
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memcpy(data->dasd_io_times, block->profile.data->dasd_io_times,
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sizeof(data->dasd_io_times));
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memcpy(data->dasd_io_timps, block->profile.data->dasd_io_timps,
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sizeof(data->dasd_io_timps));
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memcpy(data->dasd_io_time1, block->profile.data->dasd_io_time1,
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sizeof(data->dasd_io_time1));
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memcpy(data->dasd_io_time2, block->profile.data->dasd_io_time2,
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sizeof(data->dasd_io_time2));
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memcpy(data->dasd_io_time2ps,
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block->profile.data->dasd_io_time2ps,
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sizeof(data->dasd_io_time2ps));
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memcpy(data->dasd_io_time3, block->profile.data->dasd_io_time3,
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sizeof(data->dasd_io_time3));
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memcpy(data->dasd_io_nr_req,
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block->profile.data->dasd_io_nr_req,
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sizeof(data->dasd_io_nr_req));
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spin_unlock_bh(&block->profile.lock);
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} else {
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spin_unlock_bh(&block->profile.lock);
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rc = -EIO;
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goto out;
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}
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if (copy_to_user(argp, data, sizeof(*data)))
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rc = -EFAULT;
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out:
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kfree(data);
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return rc;
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}
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#else
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static int dasd_ioctl_reset_profile(struct dasd_block *block)
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{
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return -ENOTTY;
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}
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static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
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{
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return -ENOTTY;
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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 __dasd_ioctl_information(struct dasd_block *block,
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struct dasd_information2_t *dasd_info)
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{
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struct subchannel_id sch_id;
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struct ccw_dev_id dev_id;
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struct dasd_device *base;
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struct ccw_device *cdev;
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struct list_head *l;
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unsigned long flags;
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int rc;
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base = block->base;
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if (!base->discipline || !base->discipline->fill_info)
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return -EINVAL;
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rc = base->discipline->fill_info(base, dasd_info);
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if (rc)
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return rc;
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cdev = base->cdev;
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ccw_device_get_id(cdev, &dev_id);
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ccw_device_get_schid(cdev, &sch_id);
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dasd_info->devno = dev_id.devno;
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dasd_info->schid = sch_id.sch_no;
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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 = base->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(&block->open_count);
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if (!block->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 ((base->state < DASD_STATE_READY) ||
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(dasd_check_blocksize(block->bp_block)))
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dasd_info->format = DASD_FORMAT_NONE;
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dasd_info->features |=
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((base->features & DASD_FEATURE_READONLY) != 0);
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memcpy(dasd_info->type, base->discipline->name, 4);
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spin_lock_irqsave(&block->queue_lock, flags);
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list_for_each(l, &base->ccw_queue)
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dasd_info->chanq_len++;
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spin_unlock_irqrestore(&block->queue_lock, flags);
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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
|
|
*/
|
|
static int
|
|
dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp)
|
|
{
|
|
struct dasd_device *base;
|
|
int intval, rc;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EACCES;
|
|
if (bdev_is_partition(bdev))
|
|
// ro setting is not allowed for partitions
|
|
return -EINVAL;
|
|
if (get_user(intval, (int __user *)argp))
|
|
return -EFAULT;
|
|
base = dasd_device_from_gendisk(bdev->bd_disk);
|
|
if (!base)
|
|
return -ENODEV;
|
|
if (!intval && test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
|
|
dasd_put_device(base);
|
|
return -EROFS;
|
|
}
|
|
set_disk_ro(bdev->bd_disk, intval);
|
|
rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, intval);
|
|
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, fmode_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) {
|
|
PRINT_DEBUG("empty data ptr");
|
|
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 BLKROSET:
|
|
rc = dasd_ioctl_set_ro(bdev, argp);
|
|
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;
|
|
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);
|