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![Deepa Dinamani](/assets/img/avatar_default.png)
All the current architecture specific defines for these are the same. Refactor these common defines to a common header file. The new common linux/compat_time.h is also useful as it will eventually be used to hold all the defines that are needed for compat time types that support non y2038 safe types. New architectures need not have to define these new types as they will only use new y2038 safe syscalls. This file can be deleted after y2038 when we stop supporting non y2038 safe syscalls. The patch also requires an operation similar to: git grep "asm/compat\.h" | cut -d ":" -f 1 | xargs -n 1 sed -i -e "s%asm/compat.h%linux/compat.h%g" Cc: acme@kernel.org Cc: benh@kernel.crashing.org Cc: borntraeger@de.ibm.com Cc: catalin.marinas@arm.com Cc: cmetcalf@mellanox.com Cc: cohuck@redhat.com Cc: davem@davemloft.net Cc: deller@gmx.de Cc: devel@driverdev.osuosl.org Cc: gerald.schaefer@de.ibm.com Cc: gregkh@linuxfoundation.org Cc: heiko.carstens@de.ibm.com Cc: hoeppner@linux.vnet.ibm.com Cc: hpa@zytor.com Cc: jejb@parisc-linux.org Cc: jwi@linux.vnet.ibm.com Cc: linux-kernel@vger.kernel.org Cc: linux-mips@linux-mips.org Cc: linux-parisc@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-s390@vger.kernel.org Cc: mark.rutland@arm.com Cc: mingo@redhat.com Cc: mpe@ellerman.id.au Cc: oberpar@linux.vnet.ibm.com Cc: oprofile-list@lists.sf.net Cc: paulus@samba.org Cc: peterz@infradead.org Cc: ralf@linux-mips.org Cc: rostedt@goodmis.org Cc: rric@kernel.org Cc: schwidefsky@de.ibm.com Cc: sebott@linux.vnet.ibm.com Cc: sparclinux@vger.kernel.org Cc: sth@linux.vnet.ibm.com Cc: ubraun@linux.vnet.ibm.com Cc: will.deacon@arm.com Cc: x86@kernel.org Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com> Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: James Hogan <jhogan@kernel.org> Acked-by: Helge Deller <deller@gmx.de> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
618 lines
15 KiB
C
618 lines
15 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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/* 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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mutex_lock(&bdev->bd_mutex);
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i_size_write(bdev->bd_inode,
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(loff_t)get_capacity(base->block->gdp) << 9);
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mutex_unlock(&bdev->bd_mutex);
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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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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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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 != bdev->bd_contains) {
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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 != bdev->bd_contains) {
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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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#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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unsigned int cmd, void __user *argp)
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{
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struct dasd_information2_t *dasd_info;
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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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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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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 = base->discipline->fill_info(base, 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 = 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) ||
|
|
(dasd_check_blocksize(block->bp_block)))
|
|
dasd_info->format = DASD_FORMAT_NONE;
|
|
|
|
dasd_info->features |=
|
|
((base->features & DASD_FEATURE_READONLY) != 0);
|
|
|
|
memcpy(dasd_info->type, base->discipline->name, 4);
|
|
|
|
if (block->request_queue->request_fn) {
|
|
struct list_head *l;
|
|
#ifdef DASD_EXTENDED_PROFILING
|
|
{
|
|
struct list_head *l;
|
|
spin_lock_irqsave(&block->lock, flags);
|
|
list_for_each(l, &block->request_queue->queue_head)
|
|
dasd_info->req_queue_len++;
|
|
spin_unlock_irqrestore(&block->lock, flags);
|
|
}
|
|
#endif /* DASD_EXTENDED_PROFILING */
|
|
spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
|
|
list_for_each(l, &base->ccw_queue)
|
|
dasd_info->chanq_len++;
|
|
spin_unlock_irqrestore(get_ccwdev_lock(base->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 *base;
|
|
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))
|
|
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, cmd, argp);
|
|
break;
|
|
case BIODASDINFO2:
|
|
rc = dasd_ioctl_information(block, cmd, argp);
|
|
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;
|
|
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;
|
|
}
|