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linux/drivers/s390/block/dasd_ioctl.c
Greg Kroah-Hartman b24413180f License cleanup: add SPDX GPL-2.0 license identifier to files with no license 
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.

By default all files without license information are under the default
license of the kernel, which is GPL version 2.

Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier.  The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.

This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.

How this work was done:

Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
 - file had no licensing information it it.
 - file was a */uapi/* one with no licensing information in it,
 - file was a */uapi/* one with existing licensing information,

Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.

The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne.  Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.

The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed.  Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.

Criteria used to select files for SPDX license identifier tagging was:
 - Files considered eligible had to be source code files.
 - Make and config files were included as candidates if they contained >5
   lines of source
 - File already had some variant of a license header in it (even if <5
   lines).

All documentation files were explicitly excluded.

The following heuristics were used to determine which SPDX license
identifiers to apply.

 - when both scanners couldn't find any license traces, file was
   considered to have no license information in it, and the top level
   COPYING file license applied.

   For non */uapi/* files that summary was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0                                              11139

   and resulted in the first patch in this series.

   If that file was a */uapi/* path one, it was "GPL-2.0 WITH
   Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0 WITH Linux-syscall-note                        930

   and resulted in the second patch in this series.

 - if a file had some form of licensing information in it, and was one
   of the */uapi/* ones, it was denoted with the Linux-syscall-note if
   any GPL family license was found in the file or had no licensing in
   it (per prior point).  Results summary:

   SPDX license identifier                            # files
   ---------------------------------------------------|------
   GPL-2.0 WITH Linux-syscall-note                       270
   GPL-2.0+ WITH Linux-syscall-note                      169
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
   LGPL-2.1+ WITH Linux-syscall-note                      15
   GPL-1.0+ WITH Linux-syscall-note                       14
   ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
   LGPL-2.0+ WITH Linux-syscall-note                       4
   LGPL-2.1 WITH Linux-syscall-note                        3
   ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
   ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1

   and that resulted in the third patch in this series.

 - when the two scanners agreed on the detected license(s), that became
   the concluded license(s).

 - when there was disagreement between the two scanners (one detected a
   license but the other didn't, or they both detected different
   licenses) a manual inspection of the file occurred.

 - In most cases a manual inspection of the information in the file
   resulted in a clear resolution of the license that should apply (and
   which scanner probably needed to revisit its heuristics).

 - When it was not immediately clear, the license identifier was
   confirmed with lawyers working with the Linux Foundation.

 - If there was any question as to the appropriate license identifier,
   the file was flagged for further research and to be revisited later
   in time.

In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.

Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights.  The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.

Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.

In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.

Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
 - a full scancode scan run, collecting the matched texts, detected
   license ids and scores
 - reviewing anything where there was a license detected (about 500+
   files) to ensure that the applied SPDX license was correct
 - reviewing anything where there was no detection but the patch license
   was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
   SPDX license was correct

This produced a worksheet with 20 files needing minor correction.  This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.

These .csv files were then reviewed by Greg.  Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected.  This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.)  Finally Greg ran the script using the .csv files to
generate the patches.

Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-02 11:10:55 +01:00

620 lines
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// SPDX-License-Identifier: GPL-2.0
/*
* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
* Horst Hummel <Horst.Hummel@de.ibm.com>
* Carsten Otte <Cotte@de.ibm.com>
* Martin Schwidefsky <schwidefsky@de.ibm.com>
* Bugreports.to..: <Linux390@de.ibm.com>
* Copyright IBM Corp. 1999, 2001
*
* i/o controls for the dasd driver.
*/
#define KMSG_COMPONENT "dasd"
#include <linux/interrupt.h>
#include <linux/compat.h>
#include <linux/major.h>
#include <linux/fs.h>
#include <linux/blkpg.h>
#include <linux/slab.h>
#include <asm/compat.h>
#include <asm/ccwdev.h>
#include <asm/schid.h>
#include <asm/cmb.h>
#include <linux/uaccess.h>
/* This is ugly... */
#define PRINTK_HEADER "dasd_ioctl:"
#include "dasd_int.h"
static int
dasd_ioctl_api_version(void __user *argp)
{
int ver = DASD_API_VERSION;
return put_user(ver, (int __user *)argp);
}
/*
* Enable device.
* used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection
*/
static int
dasd_ioctl_enable(struct block_device *bdev)
{
struct dasd_device *base;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
base = dasd_device_from_gendisk(bdev->bd_disk);
if (!base)
return -ENODEV;
dasd_enable_device(base);
/* Formatting the dasd device can change the capacity. */
mutex_lock(&bdev->bd_mutex);
i_size_write(bdev->bd_inode,
(loff_t)get_capacity(base->block->gdp) << 9);
mutex_unlock(&bdev->bd_mutex);
dasd_put_device(base);
return 0;
}
/*
* Disable device.
* Used by dasdfmt. Disable I/O operations but allow ioctls.
*/
static int
dasd_ioctl_disable(struct block_device *bdev)
{
struct dasd_device *base;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
base = dasd_device_from_gendisk(bdev->bd_disk);
if (!base)
return -ENODEV;
/*
* Man this is sick. We don't do a real disable but only downgrade
* the device to DASD_STATE_BASIC. The reason is that dasdfmt uses
* BIODASDDISABLE to disable accesses to the device via the block
* device layer but it still wants to do i/o on the device by
* using the BIODASDFMT ioctl. Therefore the correct state for the
* device is DASD_STATE_BASIC that allows to do basic i/o.
*/
dasd_set_target_state(base, DASD_STATE_BASIC);
/*
* Set i_size to zero, since read, write, etc. check against this
* value.
*/
mutex_lock(&bdev->bd_mutex);
i_size_write(bdev->bd_inode, 0);
mutex_unlock(&bdev->bd_mutex);
dasd_put_device(base);
return 0;
}
/*
* Quiesce device.
*/
static int dasd_ioctl_quiesce(struct dasd_block *block)
{
unsigned long flags;
struct dasd_device *base;
base = block->base;
if (!capable (CAP_SYS_ADMIN))
return -EACCES;
pr_info("%s: The DASD has been put in the quiesce "
"state\n", dev_name(&base->cdev->dev));
spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
return 0;
}
/*
* Resume device.
*/
static int dasd_ioctl_resume(struct dasd_block *block)
{
unsigned long flags;
struct dasd_device *base;
base = block->base;
if (!capable (CAP_SYS_ADMIN))
return -EACCES;
pr_info("%s: I/O operations have been resumed "
"on the DASD\n", dev_name(&base->cdev->dev));
spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
dasd_device_remove_stop_bits(base, DASD_STOPPED_QUIESCE);
spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
dasd_schedule_block_bh(block);
return 0;
}
/*
* Abort all failfast I/O on a device.
*/
static int dasd_ioctl_abortio(struct dasd_block *block)
{
unsigned long flags;
struct dasd_device *base;
struct dasd_ccw_req *cqr, *n;
base = block->base;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (test_and_set_bit(DASD_FLAG_ABORTALL, &base->flags))
return 0;
DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag set");
spin_lock_irqsave(&block->request_queue_lock, flags);
spin_lock(&block->queue_lock);
list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
if (test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
cqr->callback_data &&
cqr->callback_data != DASD_SLEEPON_START_TAG &&
cqr->callback_data != DASD_SLEEPON_END_TAG) {
spin_unlock(&block->queue_lock);
blk_abort_request(cqr->callback_data);
spin_lock(&block->queue_lock);
}
}
spin_unlock(&block->queue_lock);
spin_unlock_irqrestore(&block->request_queue_lock, flags);
dasd_schedule_block_bh(block);
return 0;
}
/*
* Allow I/O on a device
*/
static int dasd_ioctl_allowio(struct dasd_block *block)
{
struct dasd_device *base;
base = block->base;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (test_and_clear_bit(DASD_FLAG_ABORTALL, &base->flags))
DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag unset");
return 0;
}
/*
* performs formatting of _device_ according to _fdata_
* Note: The discipline's format_function is assumed to deliver formatting
* commands to format multiple units of the device. In terms of the ECKD
* devices this means CCWs are generated to format multiple tracks.
*/
static int
dasd_format(struct dasd_block *block, struct format_data_t *fdata)
{
struct dasd_device *base;
int rc;
base = block->base;
if (base->discipline->format_device == NULL)
return -EPERM;
if (base->state != DASD_STATE_BASIC) {
pr_warn("%s: The DASD cannot be formatted while it is enabled\n",
dev_name(&base->cdev->dev));
return -EBUSY;
}
DBF_DEV_EVENT(DBF_NOTICE, base,
"formatting units %u to %u (%u B blocks) flags %u",
fdata->start_unit,
fdata->stop_unit, fdata->blksize, fdata->intensity);
/* Since dasdfmt keeps the device open after it was disabled,
* there still exists an inode for this device.
* We must update i_blkbits, otherwise we might get errors when
* enabling the device later.
*/
if (fdata->start_unit == 0) {
struct block_device *bdev = bdget_disk(block->gdp, 0);
bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize);
bdput(bdev);
}
rc = base->discipline->format_device(base, fdata, 1);
if (rc == -EAGAIN)
rc = base->discipline->format_device(base, fdata, 0);
return rc;
}
static int dasd_check_format(struct dasd_block *block,
struct format_check_t *cdata)
{
struct dasd_device *base;
int rc;
base = block->base;
if (!base->discipline->check_device_format)
return -ENOTTY;
rc = base->discipline->check_device_format(base, cdata, 1);
if (rc == -EAGAIN)
rc = base->discipline->check_device_format(base, cdata, 0);
return rc;
}
/*
* Format device.
*/
static int
dasd_ioctl_format(struct block_device *bdev, void __user *argp)
{
struct dasd_device *base;
struct format_data_t fdata;
int rc;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (!argp)
return -EINVAL;
base = dasd_device_from_gendisk(bdev->bd_disk);
if (!base)
return -ENODEV;
if (base->features & DASD_FEATURE_READONLY ||
test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
dasd_put_device(base);
return -EROFS;
}
if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) {
dasd_put_device(base);
return -EFAULT;
}
if (bdev != bdev->bd_contains) {
pr_warn("%s: The specified DASD is a partition and cannot be formatted\n",
dev_name(&base->cdev->dev));
dasd_put_device(base);
return -EINVAL;
}
rc = dasd_format(base->block, &fdata);
dasd_put_device(base);
return rc;
}
/*
* Check device format
*/
static int dasd_ioctl_check_format(struct block_device *bdev, void __user *argp)
{
struct format_check_t cdata;
struct dasd_device *base;
int rc = 0;
if (!argp)
return -EINVAL;
base = dasd_device_from_gendisk(bdev->bd_disk);
if (!base)
return -ENODEV;
if (bdev != bdev->bd_contains) {
pr_warn("%s: The specified DASD is a partition and cannot be checked\n",
dev_name(&base->cdev->dev));
rc = -EINVAL;
goto out_err;
}
if (copy_from_user(&cdata, argp, sizeof(cdata))) {
rc = -EFAULT;
goto out_err;
}
rc = dasd_check_format(base->block, &cdata);
if (rc)
goto out_err;
if (copy_to_user(argp, &cdata, sizeof(cdata)))
rc = -EFAULT;
out_err:
dasd_put_device(base);
return rc;
}
#ifdef CONFIG_DASD_PROFILE
/*
* Reset device profile information
*/
static int dasd_ioctl_reset_profile(struct dasd_block *block)
{
dasd_profile_reset(&block->profile);
return 0;
}
/*
* Return device profile information
*/
static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
{
struct dasd_profile_info_t *data;
int rc = 0;
data = kmalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
spin_lock_bh(&block->profile.lock);
if (block->profile.data) {
data->dasd_io_reqs = block->profile.data->dasd_io_reqs;
data->dasd_io_sects = block->profile.data->dasd_io_sects;
memcpy(data->dasd_io_secs, block->profile.data->dasd_io_secs,
sizeof(data->dasd_io_secs));
memcpy(data->dasd_io_times, block->profile.data->dasd_io_times,
sizeof(data->dasd_io_times));
memcpy(data->dasd_io_timps, block->profile.data->dasd_io_timps,
sizeof(data->dasd_io_timps));
memcpy(data->dasd_io_time1, block->profile.data->dasd_io_time1,
sizeof(data->dasd_io_time1));
memcpy(data->dasd_io_time2, block->profile.data->dasd_io_time2,
sizeof(data->dasd_io_time2));
memcpy(data->dasd_io_time2ps,
block->profile.data->dasd_io_time2ps,
sizeof(data->dasd_io_time2ps));
memcpy(data->dasd_io_time3, block->profile.data->dasd_io_time3,
sizeof(data->dasd_io_time3));
memcpy(data->dasd_io_nr_req,
block->profile.data->dasd_io_nr_req,
sizeof(data->dasd_io_nr_req));
spin_unlock_bh(&block->profile.lock);
} else {
spin_unlock_bh(&block->profile.lock);
rc = -EIO;
goto out;
}
if (copy_to_user(argp, data, sizeof(*data)))
rc = -EFAULT;
out:
kfree(data);
return rc;
}
#else
static int dasd_ioctl_reset_profile(struct dasd_block *block)
{
return -ENOTTY;
}
static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
{
return -ENOTTY;
}
#endif
/*
* Return dasd information. Used for BIODASDINFO and BIODASDINFO2.
*/
static int dasd_ioctl_information(struct dasd_block *block,
unsigned int cmd, void __user *argp)
{
struct dasd_information2_t *dasd_info;
struct subchannel_id sch_id;
struct ccw_dev_id dev_id;
struct dasd_device *base;
struct ccw_device *cdev;
unsigned long flags;
int rc;
base = block->base;
if (!base->discipline || !base->discipline->fill_info)
return -EINVAL;
dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL);
if (dasd_info == NULL)
return -ENOMEM;
rc = base->discipline->fill_info(base, dasd_info);
if (rc) {
kfree(dasd_info);
return rc;
}
cdev = base->cdev;
ccw_device_get_id(cdev, &dev_id);
ccw_device_get_schid(cdev, &sch_id);
dasd_info->devno = dev_id.devno;
dasd_info->schid = sch_id.sch_no;
dasd_info->cu_type = cdev->id.cu_type;
dasd_info->cu_model = cdev->id.cu_model;
dasd_info->dev_type = cdev->id.dev_type;
dasd_info->dev_model = cdev->id.dev_model;
dasd_info->status = base->state;
/*
* The open_count is increased for every opener, that includes
* the blkdev_get in dasd_scan_partitions.
* This must be hidden from user-space.
*/
dasd_info->open_count = atomic_read(&block->open_count);
if (!block->bdev)
dasd_info->open_count++;
/*
* check if device is really formatted
* LDL / CDL was returned by 'fill_info'
*/
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;
}
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