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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
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>
501 lines
11 KiB
C
501 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* character device frontend for tape device driver
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*
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* S390 and zSeries version
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* Copyright IBM Corp. 2001, 2006
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* Author(s): Carsten Otte <cotte@de.ibm.com>
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* Michael Holzheu <holzheu@de.ibm.com>
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* Tuan Ngo-Anh <ngoanh@de.ibm.com>
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* Martin Schwidefsky <schwidefsky@de.ibm.com>
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*/
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#define KMSG_COMPONENT "tape"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/proc_fs.h>
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#include <linux/mtio.h>
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#include <linux/compat.h>
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#include <linux/uaccess.h>
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#define TAPE_DBF_AREA tape_core_dbf
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#include "tape.h"
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#include "tape_std.h"
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#include "tape_class.h"
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#define TAPECHAR_MAJOR 0 /* get dynamic major */
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/*
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* file operation structure for tape character frontend
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*/
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static ssize_t tapechar_read(struct file *, char __user *, size_t, loff_t *);
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static ssize_t tapechar_write(struct file *, const char __user *, size_t, loff_t *);
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static int tapechar_open(struct inode *,struct file *);
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static int tapechar_release(struct inode *,struct file *);
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static long tapechar_ioctl(struct file *, unsigned int, unsigned long);
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#ifdef CONFIG_COMPAT
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static long tapechar_compat_ioctl(struct file *, unsigned int, unsigned long);
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#endif
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static const struct file_operations tape_fops =
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{
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.owner = THIS_MODULE,
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.read = tapechar_read,
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.write = tapechar_write,
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.unlocked_ioctl = tapechar_ioctl,
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#ifdef CONFIG_COMPAT
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.compat_ioctl = tapechar_compat_ioctl,
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#endif
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.open = tapechar_open,
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.release = tapechar_release,
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.llseek = no_llseek,
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};
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static int tapechar_major = TAPECHAR_MAJOR;
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/*
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* This function is called for every new tapedevice
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*/
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int
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tapechar_setup_device(struct tape_device * device)
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{
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char device_name[20];
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sprintf(device_name, "ntibm%i", device->first_minor / 2);
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device->nt = register_tape_dev(
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&device->cdev->dev,
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MKDEV(tapechar_major, device->first_minor),
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&tape_fops,
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device_name,
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"non-rewinding"
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);
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device_name[0] = 'r';
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device->rt = register_tape_dev(
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&device->cdev->dev,
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MKDEV(tapechar_major, device->first_minor + 1),
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&tape_fops,
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device_name,
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"rewinding"
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);
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return 0;
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}
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void
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tapechar_cleanup_device(struct tape_device *device)
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{
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unregister_tape_dev(&device->cdev->dev, device->rt);
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device->rt = NULL;
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unregister_tape_dev(&device->cdev->dev, device->nt);
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device->nt = NULL;
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}
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static int
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tapechar_check_idalbuffer(struct tape_device *device, size_t block_size)
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{
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struct idal_buffer *new;
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if (device->char_data.idal_buf != NULL &&
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device->char_data.idal_buf->size == block_size)
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return 0;
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if (block_size > MAX_BLOCKSIZE) {
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DBF_EVENT(3, "Invalid blocksize (%zd > %d)\n",
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block_size, MAX_BLOCKSIZE);
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return -EINVAL;
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}
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/* The current idal buffer is not correct. Allocate a new one. */
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new = idal_buffer_alloc(block_size, 0);
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if (IS_ERR(new))
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return -ENOMEM;
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if (device->char_data.idal_buf != NULL)
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idal_buffer_free(device->char_data.idal_buf);
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device->char_data.idal_buf = new;
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return 0;
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}
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/*
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* Tape device read function
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*/
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static ssize_t
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tapechar_read(struct file *filp, char __user *data, size_t count, loff_t *ppos)
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{
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struct tape_device *device;
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struct tape_request *request;
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size_t block_size;
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int rc;
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DBF_EVENT(6, "TCHAR:read\n");
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device = (struct tape_device *) filp->private_data;
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/*
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* If the tape isn't terminated yet, do it now. And since we then
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* are at the end of the tape there wouldn't be anything to read
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* anyways. So we return immediately.
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*/
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if(device->required_tapemarks) {
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return tape_std_terminate_write(device);
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}
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/* Find out block size to use */
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if (device->char_data.block_size != 0) {
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if (count < device->char_data.block_size) {
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DBF_EVENT(3, "TCHAR:read smaller than block "
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"size was requested\n");
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return -EINVAL;
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}
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block_size = device->char_data.block_size;
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} else {
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block_size = count;
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}
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rc = tapechar_check_idalbuffer(device, block_size);
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if (rc)
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return rc;
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DBF_EVENT(6, "TCHAR:nbytes: %lx\n", block_size);
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/* Let the discipline build the ccw chain. */
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request = device->discipline->read_block(device, block_size);
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if (IS_ERR(request))
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return PTR_ERR(request);
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/* Execute it. */
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rc = tape_do_io(device, request);
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if (rc == 0) {
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rc = block_size - request->rescnt;
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DBF_EVENT(6, "TCHAR:rbytes: %x\n", rc);
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/* Copy data from idal buffer to user space. */
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if (idal_buffer_to_user(device->char_data.idal_buf,
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data, rc) != 0)
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rc = -EFAULT;
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}
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tape_free_request(request);
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return rc;
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}
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/*
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* Tape device write function
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*/
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static ssize_t
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tapechar_write(struct file *filp, const char __user *data, size_t count, loff_t *ppos)
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{
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struct tape_device *device;
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struct tape_request *request;
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size_t block_size;
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size_t written;
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int nblocks;
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int i, rc;
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DBF_EVENT(6, "TCHAR:write\n");
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device = (struct tape_device *) filp->private_data;
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/* Find out block size and number of blocks */
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if (device->char_data.block_size != 0) {
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if (count < device->char_data.block_size) {
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DBF_EVENT(3, "TCHAR:write smaller than block "
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"size was requested\n");
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return -EINVAL;
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}
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block_size = device->char_data.block_size;
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nblocks = count / block_size;
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} else {
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block_size = count;
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nblocks = 1;
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}
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rc = tapechar_check_idalbuffer(device, block_size);
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if (rc)
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return rc;
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DBF_EVENT(6,"TCHAR:nbytes: %lx\n", block_size);
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DBF_EVENT(6, "TCHAR:nblocks: %x\n", nblocks);
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/* Let the discipline build the ccw chain. */
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request = device->discipline->write_block(device, block_size);
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if (IS_ERR(request))
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return PTR_ERR(request);
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rc = 0;
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written = 0;
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for (i = 0; i < nblocks; i++) {
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/* Copy data from user space to idal buffer. */
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if (idal_buffer_from_user(device->char_data.idal_buf,
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data, block_size)) {
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rc = -EFAULT;
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break;
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}
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rc = tape_do_io(device, request);
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if (rc)
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break;
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DBF_EVENT(6, "TCHAR:wbytes: %lx\n",
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block_size - request->rescnt);
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written += block_size - request->rescnt;
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if (request->rescnt != 0)
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break;
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data += block_size;
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}
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tape_free_request(request);
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if (rc == -ENOSPC) {
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/*
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* Ok, the device has no more space. It has NOT written
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* the block.
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*/
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if (device->discipline->process_eov)
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device->discipline->process_eov(device);
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if (written > 0)
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rc = 0;
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}
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/*
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* After doing a write we always need two tapemarks to correctly
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* terminate the tape (one to terminate the file, the second to
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* flag the end of recorded data.
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* Since process_eov positions the tape in front of the written
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* tapemark it doesn't hurt to write two marks again.
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*/
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if (!rc)
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device->required_tapemarks = 2;
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return rc ? rc : written;
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}
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/*
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* Character frontend tape device open function.
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*/
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static int
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tapechar_open (struct inode *inode, struct file *filp)
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{
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struct tape_device *device;
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int minor, rc;
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DBF_EVENT(6, "TCHAR:open: %i:%i\n",
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imajor(file_inode(filp)),
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iminor(file_inode(filp)));
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if (imajor(file_inode(filp)) != tapechar_major)
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return -ENODEV;
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minor = iminor(file_inode(filp));
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device = tape_find_device(minor / TAPE_MINORS_PER_DEV);
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if (IS_ERR(device)) {
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DBF_EVENT(3, "TCHAR:open: tape_find_device() failed\n");
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return PTR_ERR(device);
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}
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rc = tape_open(device);
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if (rc == 0) {
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filp->private_data = device;
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nonseekable_open(inode, filp);
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} else
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tape_put_device(device);
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return rc;
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}
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/*
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* Character frontend tape device release function.
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*/
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static int
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tapechar_release(struct inode *inode, struct file *filp)
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{
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struct tape_device *device;
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DBF_EVENT(6, "TCHAR:release: %x\n", iminor(inode));
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device = (struct tape_device *) filp->private_data;
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/*
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* If this is the rewinding tape minor then rewind. In that case we
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* write all required tapemarks. Otherwise only one to terminate the
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* file.
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*/
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if ((iminor(inode) & 1) != 0) {
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if (device->required_tapemarks)
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tape_std_terminate_write(device);
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tape_mtop(device, MTREW, 1);
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} else {
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if (device->required_tapemarks > 1) {
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if (tape_mtop(device, MTWEOF, 1) == 0)
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device->required_tapemarks--;
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}
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}
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if (device->char_data.idal_buf != NULL) {
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idal_buffer_free(device->char_data.idal_buf);
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device->char_data.idal_buf = NULL;
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}
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tape_release(device);
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filp->private_data = NULL;
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tape_put_device(device);
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return 0;
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}
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/*
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* Tape device io controls.
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*/
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static int
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__tapechar_ioctl(struct tape_device *device,
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unsigned int no, unsigned long data)
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{
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int rc;
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if (no == MTIOCTOP) {
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struct mtop op;
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if (copy_from_user(&op, (char __user *) data, sizeof(op)) != 0)
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return -EFAULT;
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if (op.mt_count < 0)
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return -EINVAL;
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/*
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* Operations that change tape position should write final
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* tapemarks.
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*/
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switch (op.mt_op) {
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case MTFSF:
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case MTBSF:
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case MTFSR:
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case MTBSR:
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case MTREW:
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case MTOFFL:
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case MTEOM:
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case MTRETEN:
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case MTBSFM:
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case MTFSFM:
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case MTSEEK:
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if (device->required_tapemarks)
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tape_std_terminate_write(device);
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default:
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;
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}
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rc = tape_mtop(device, op.mt_op, op.mt_count);
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if (op.mt_op == MTWEOF && rc == 0) {
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if (op.mt_count > device->required_tapemarks)
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device->required_tapemarks = 0;
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else
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device->required_tapemarks -= op.mt_count;
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}
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return rc;
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}
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if (no == MTIOCPOS) {
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/* MTIOCPOS: query the tape position. */
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struct mtpos pos;
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rc = tape_mtop(device, MTTELL, 1);
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if (rc < 0)
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return rc;
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pos.mt_blkno = rc;
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if (copy_to_user((char __user *) data, &pos, sizeof(pos)) != 0)
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return -EFAULT;
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return 0;
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}
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if (no == MTIOCGET) {
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/* MTIOCGET: query the tape drive status. */
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struct mtget get;
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memset(&get, 0, sizeof(get));
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get.mt_type = MT_ISUNKNOWN;
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get.mt_resid = 0 /* device->devstat.rescnt */;
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get.mt_dsreg =
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((device->char_data.block_size << MT_ST_BLKSIZE_SHIFT)
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& MT_ST_BLKSIZE_MASK);
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/* FIXME: mt_gstat, mt_erreg, mt_fileno */
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get.mt_gstat = 0;
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get.mt_erreg = 0;
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get.mt_fileno = 0;
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get.mt_gstat = device->tape_generic_status;
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if (device->medium_state == MS_LOADED) {
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rc = tape_mtop(device, MTTELL, 1);
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if (rc < 0)
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return rc;
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if (rc == 0)
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get.mt_gstat |= GMT_BOT(~0);
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get.mt_blkno = rc;
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}
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if (copy_to_user((char __user *) data, &get, sizeof(get)) != 0)
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return -EFAULT;
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return 0;
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}
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/* Try the discipline ioctl function. */
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|
if (device->discipline->ioctl_fn == NULL)
|
|
return -EINVAL;
|
|
return device->discipline->ioctl_fn(device, no, data);
|
|
}
|
|
|
|
static long
|
|
tapechar_ioctl(struct file *filp, unsigned int no, unsigned long data)
|
|
{
|
|
struct tape_device *device;
|
|
long rc;
|
|
|
|
DBF_EVENT(6, "TCHAR:ioct\n");
|
|
|
|
device = (struct tape_device *) filp->private_data;
|
|
mutex_lock(&device->mutex);
|
|
rc = __tapechar_ioctl(device, no, data);
|
|
mutex_unlock(&device->mutex);
|
|
return rc;
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static long
|
|
tapechar_compat_ioctl(struct file *filp, unsigned int no, unsigned long data)
|
|
{
|
|
struct tape_device *device = filp->private_data;
|
|
int rval = -ENOIOCTLCMD;
|
|
unsigned long argp;
|
|
|
|
/* The 'arg' argument of any ioctl function may only be used for
|
|
* pointers because of the compat pointer conversion.
|
|
* Consider this when adding new ioctls.
|
|
*/
|
|
argp = (unsigned long) compat_ptr(data);
|
|
if (device->discipline->ioctl_fn) {
|
|
mutex_lock(&device->mutex);
|
|
rval = device->discipline->ioctl_fn(device, no, argp);
|
|
mutex_unlock(&device->mutex);
|
|
if (rval == -EINVAL)
|
|
rval = -ENOIOCTLCMD;
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
#endif /* CONFIG_COMPAT */
|
|
|
|
/*
|
|
* Initialize character device frontend.
|
|
*/
|
|
int
|
|
tapechar_init (void)
|
|
{
|
|
dev_t dev;
|
|
|
|
if (alloc_chrdev_region(&dev, 0, 256, "tape") != 0)
|
|
return -1;
|
|
|
|
tapechar_major = MAJOR(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* cleanup
|
|
*/
|
|
void
|
|
tapechar_exit(void)
|
|
{
|
|
unregister_chrdev_region(MKDEV(tapechar_major, 0), 256);
|
|
}
|