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681 lines
16 KiB
681 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Author(s)......: Holger Smolinski <[email protected]> |
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* Horst Hummel <[email protected]> |
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* Carsten Otte <[email protected]> |
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* Martin Schwidefsky <[email protected]> |
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* Bugreports.to..: <[email protected]> |
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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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|
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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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/* |
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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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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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set_capacity(bdev->bd_disk, 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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block->gdp->part0->bd_inode->i_blkbits = |
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blksize_bits(fdata->blksize); |
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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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/* |
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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; |
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} |
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static int dasd_ioctl_information(struct dasd_block *block, void __user *argp, |
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size_t copy_size) |
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{ |
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struct dasd_information2_t *dasd_info; |
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int error; |
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dasd_info = kzalloc(sizeof(*dasd_info), GFP_KERNEL); |
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if (!dasd_info) |
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return -ENOMEM; |
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error = __dasd_ioctl_information(block, dasd_info); |
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if (!error && copy_to_user(argp, dasd_info, copy_size)) |
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error = -EFAULT; |
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kfree(dasd_info); |
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return error; |
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} |
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|
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/* |
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* Set read only |
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*/ |
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int dasd_set_read_only(struct block_device *bdev, bool ro) |
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{ |
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struct dasd_device *base; |
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int rc; |
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|
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/* do not manipulate hardware state for partitions */ |
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if (bdev_is_partition(bdev)) |
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return 0; |
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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 (!ro && test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) |
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rc = -EROFS; |
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else |
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rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, ro); |
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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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static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd, |
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struct cmbdata __user *argp) |
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{ |
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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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|
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ret = cmf_readall(block->base->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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|
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int dasd_ioctl(struct block_device *bdev, fmode_t mode, |
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unsigned int cmd, unsigned long arg) |
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{ |
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struct dasd_block *block; |
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struct dasd_device *base; |
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void __user *argp; |
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int rc; |
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|
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if (is_compat_task()) |
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argp = compat_ptr(arg); |
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else |
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argp = (void __user *)arg; |
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|
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if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) |
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return -EINVAL; |
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|
|
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 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);
|
|
|