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alistair23-linux/drivers/ide/ide-floppy_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

305 lines
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// SPDX-License-Identifier: GPL-2.0
/*
* ide-floppy IOCTLs handling.
*/
#include <linux/kernel.h>
#include <linux/ide.h>
#include <linux/cdrom.h>
#include <linux/mutex.h>
#include <asm/unaligned.h>
#include <scsi/scsi_ioctl.h>
#include "ide-floppy.h"
/*
* Obtain the list of formattable capacities.
* Very similar to ide_floppy_get_capacity, except that we push the capacity
* descriptors to userland, instead of our own structures.
*
* Userland gives us the following structure:
*
* struct idefloppy_format_capacities {
* int nformats;
* struct {
* int nblocks;
* int blocksize;
* } formats[];
* };
*
* userland initializes nformats to the number of allocated formats[] records.
* On exit we set nformats to the number of records we've actually initialized.
*/
static DEFINE_MUTEX(ide_floppy_ioctl_mutex);
static int ide_floppy_get_format_capacities(ide_drive_t *drive,
struct ide_atapi_pc *pc,
int __user *arg)
{
struct ide_disk_obj *floppy = drive->driver_data;
int i, blocks, length, u_array_size, u_index;
int __user *argp;
u8 pc_buf[256], header_len, desc_cnt;
if (get_user(u_array_size, arg))
return -EFAULT;
if (u_array_size <= 0)
return -EINVAL;
ide_floppy_create_read_capacity_cmd(pc);
if (ide_queue_pc_tail(drive, floppy->disk, pc, pc_buf, pc->req_xfer)) {
printk(KERN_ERR "ide-floppy: Can't get floppy parameters\n");
return -EIO;
}
header_len = pc_buf[3];
desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */
u_index = 0;
argp = arg + 1;
/*
* We always skip the first capacity descriptor. That's the current
* capacity. We are interested in the remaining descriptors, the
* formattable capacities.
*/
for (i = 1; i < desc_cnt; i++) {
unsigned int desc_start = 4 + i*8;
if (u_index >= u_array_size)
break; /* User-supplied buffer too small */
blocks = be32_to_cpup((__be32 *)&pc_buf[desc_start]);
length = be16_to_cpup((__be16 *)&pc_buf[desc_start + 6]);
if (put_user(blocks, argp))
return -EFAULT;
++argp;
if (put_user(length, argp))
return -EFAULT;
++argp;
++u_index;
}
if (put_user(u_index, arg))
return -EFAULT;
return 0;
}
static void ide_floppy_create_format_unit_cmd(struct ide_atapi_pc *pc,
u8 *buf, int b, int l,
int flags)
{
ide_init_pc(pc);
pc->c[0] = GPCMD_FORMAT_UNIT;
pc->c[1] = 0x17;
memset(buf, 0, 12);
buf[1] = 0xA2;
/* Default format list header, u8 1: FOV/DCRT/IMM bits set */
if (flags & 1) /* Verify bit on... */
buf[1] ^= 0x20; /* ... turn off DCRT bit */
buf[3] = 8;
put_unaligned(cpu_to_be32(b), (unsigned int *)(&buf[4]));
put_unaligned(cpu_to_be32(l), (unsigned int *)(&buf[8]));
pc->req_xfer = 12;
pc->flags |= PC_FLAG_WRITING;
}
static int ide_floppy_get_sfrp_bit(ide_drive_t *drive, struct ide_atapi_pc *pc)
{
struct ide_disk_obj *floppy = drive->driver_data;
u8 buf[20];
drive->atapi_flags &= ~IDE_AFLAG_SRFP;
ide_floppy_create_mode_sense_cmd(pc, IDEFLOPPY_CAPABILITIES_PAGE);
pc->flags |= PC_FLAG_SUPPRESS_ERROR;
if (ide_queue_pc_tail(drive, floppy->disk, pc, buf, pc->req_xfer))
return 1;
if (buf[8 + 2] & 0x40)
drive->atapi_flags |= IDE_AFLAG_SRFP;
return 0;
}
static int ide_floppy_format_unit(ide_drive_t *drive, struct ide_atapi_pc *pc,
int __user *arg)
{
struct ide_disk_obj *floppy = drive->driver_data;
u8 buf[12];
int blocks, length, flags, err = 0;
if (floppy->openers > 1) {
/* Don't format if someone is using the disk */
drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
return -EBUSY;
}
drive->dev_flags |= IDE_DFLAG_FORMAT_IN_PROGRESS;
/*
* Send ATAPI_FORMAT_UNIT to the drive.
*
* Userland gives us the following structure:
*
* struct idefloppy_format_command {
* int nblocks;
* int blocksize;
* int flags;
* } ;
*
* flags is a bitmask, currently, the only defined flag is:
*
* 0x01 - verify media after format.
*/
if (get_user(blocks, arg) ||
get_user(length, arg+1) ||
get_user(flags, arg+2)) {
err = -EFAULT;
goto out;
}
ide_floppy_get_sfrp_bit(drive, pc);
ide_floppy_create_format_unit_cmd(pc, buf, blocks, length, flags);
if (ide_queue_pc_tail(drive, floppy->disk, pc, buf, pc->req_xfer))
err = -EIO;
out:
if (err)
drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
return err;
}
/*
* Get ATAPI_FORMAT_UNIT progress indication.
*
* Userland gives a pointer to an int. The int is set to a progress
* indicator 0-65536, with 65536=100%.
*
* If the drive does not support format progress indication, we just check
* the dsc bit, and return either 0 or 65536.
*/
static int ide_floppy_get_format_progress(ide_drive_t *drive,
struct ide_atapi_pc *pc,
int __user *arg)
{
struct ide_disk_obj *floppy = drive->driver_data;
u8 sense_buf[18];
int progress_indication = 0x10000;
if (drive->atapi_flags & IDE_AFLAG_SRFP) {
ide_create_request_sense_cmd(drive, pc);
if (ide_queue_pc_tail(drive, floppy->disk, pc, sense_buf,
pc->req_xfer))
return -EIO;
if (floppy->sense_key == 2 &&
floppy->asc == 4 &&
floppy->ascq == 4)
progress_indication = floppy->progress_indication;
/* Else assume format_unit has finished, and we're at 0x10000 */
} else {
ide_hwif_t *hwif = drive->hwif;
unsigned long flags;
u8 stat;
local_irq_save(flags);
stat = hwif->tp_ops->read_status(hwif);
local_irq_restore(flags);
progress_indication = ((stat & ATA_DSC) == 0) ? 0 : 0x10000;
}
if (put_user(progress_indication, arg))
return -EFAULT;
return 0;
}
static int ide_floppy_lockdoor(ide_drive_t *drive, struct ide_atapi_pc *pc,
unsigned long arg, unsigned int cmd)
{
struct ide_disk_obj *floppy = drive->driver_data;
struct gendisk *disk = floppy->disk;
int prevent = (arg && cmd != CDROMEJECT) ? 1 : 0;
if (floppy->openers > 1)
return -EBUSY;
ide_set_media_lock(drive, disk, prevent);
if (cmd == CDROMEJECT)
ide_do_start_stop(drive, disk, 2);
return 0;
}
static int ide_floppy_format_ioctl(ide_drive_t *drive, struct ide_atapi_pc *pc,
fmode_t mode, unsigned int cmd,
void __user *argp)
{
switch (cmd) {
case IDEFLOPPY_IOCTL_FORMAT_SUPPORTED:
return 0;
case IDEFLOPPY_IOCTL_FORMAT_GET_CAPACITY:
return ide_floppy_get_format_capacities(drive, pc, argp);
case IDEFLOPPY_IOCTL_FORMAT_START:
if (!(mode & FMODE_WRITE))
return -EPERM;
return ide_floppy_format_unit(drive, pc, (int __user *)argp);
case IDEFLOPPY_IOCTL_FORMAT_GET_PROGRESS:
return ide_floppy_get_format_progress(drive, pc, argp);
default:
return -ENOTTY;
}
}
int ide_floppy_ioctl(ide_drive_t *drive, struct block_device *bdev,
fmode_t mode, unsigned int cmd, unsigned long arg)
{
struct ide_atapi_pc pc;
void __user *argp = (void __user *)arg;
int err;
mutex_lock(&ide_floppy_ioctl_mutex);
if (cmd == CDROMEJECT || cmd == CDROM_LOCKDOOR) {
err = ide_floppy_lockdoor(drive, &pc, arg, cmd);
goto out;
}
err = ide_floppy_format_ioctl(drive, &pc, mode, cmd, argp);
if (err != -ENOTTY)
goto out;
/*
* skip SCSI_IOCTL_SEND_COMMAND (deprecated)
* and CDROM_SEND_PACKET (legacy) ioctls
*/
if (cmd != CDROM_SEND_PACKET && cmd != SCSI_IOCTL_SEND_COMMAND)
err = scsi_cmd_blk_ioctl(bdev, mode, cmd, argp);
if (err == -ENOTTY)
err = generic_ide_ioctl(drive, bdev, cmd, arg);
out:
mutex_unlock(&ide_floppy_ioctl_mutex);
return err;
}
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