linux/drivers/scsi/scsi_proc.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

484 lines
11 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* linux/drivers/scsi/scsi_proc.c
*
* The functions in this file provide an interface between
* the PROC file system and the SCSI device drivers
* It is mainly used for debugging, statistics and to pass
* information directly to the lowlevel driver.
*
* (c) 1995 Michael Neuffer neuffer@goofy.zdv.uni-mainz.de
* Version: 0.99.8 last change: 95/09/13
*
* generic command parser provided by:
* Andreas Heilwagen <crashcar@informatik.uni-koblenz.de>
*
* generic_proc_info() support of xxxx_info() by:
* Michael A. Griffith <grif@acm.org>
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/proc_fs.h>
#include <linux/errno.h>
#include <linux/blkdev.h>
#include <linux/seq_file.h>
#include <linux/mutex.h>
#include <linux/gfp.h>
#include <linux/uaccess.h>
#include <scsi/scsi.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport.h>
#include "scsi_priv.h"
#include "scsi_logging.h"
/* 4K page size, but our output routines, use some slack for overruns */
#define PROC_BLOCK_SIZE (3*1024)
static struct proc_dir_entry *proc_scsi;
/* Protect sht->present and sht->proc_dir */
static DEFINE_MUTEX(global_host_template_mutex);
static ssize_t proc_scsi_host_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
struct Scsi_Host *shost = PDE_DATA(file_inode(file));
ssize_t ret = -ENOMEM;
char *page;
if (count > PROC_BLOCK_SIZE)
return -EOVERFLOW;
if (!shost->hostt->write_info)
return -EINVAL;
page = (char *)__get_free_page(GFP_KERNEL);
if (page) {
ret = -EFAULT;
if (copy_from_user(page, buf, count))
goto out;
ret = shost->hostt->write_info(shost, page, count);
}
out:
free_page((unsigned long)page);
return ret;
}
static int proc_scsi_show(struct seq_file *m, void *v)
{
struct Scsi_Host *shost = m->private;
return shost->hostt->show_info(m, shost);
}
static int proc_scsi_host_open(struct inode *inode, struct file *file)
{
return single_open_size(file, proc_scsi_show, PDE_DATA(inode),
4 * PAGE_SIZE);
}
static const struct file_operations proc_scsi_fops = {
.open = proc_scsi_host_open,
.release = single_release,
.read = seq_read,
.llseek = seq_lseek,
.write = proc_scsi_host_write
};
/**
* scsi_proc_hostdir_add - Create directory in /proc for a scsi host
* @sht: owner of this directory
*
* Sets sht->proc_dir to the new directory.
*/
void scsi_proc_hostdir_add(struct scsi_host_template *sht)
{
if (!sht->show_info)
return;
mutex_lock(&global_host_template_mutex);
if (!sht->present++) {
sht->proc_dir = proc_mkdir(sht->proc_name, proc_scsi);
if (!sht->proc_dir)
printk(KERN_ERR "%s: proc_mkdir failed for %s\n",
__func__, sht->proc_name);
}
mutex_unlock(&global_host_template_mutex);
}
/**
* scsi_proc_hostdir_rm - remove directory in /proc for a scsi host
* @sht: owner of directory
*/
void scsi_proc_hostdir_rm(struct scsi_host_template *sht)
{
if (!sht->show_info)
return;
mutex_lock(&global_host_template_mutex);
if (!--sht->present && sht->proc_dir) {
remove_proc_entry(sht->proc_name, proc_scsi);
sht->proc_dir = NULL;
}
mutex_unlock(&global_host_template_mutex);
}
/**
* scsi_proc_host_add - Add entry for this host to appropriate /proc dir
* @shost: host to add
*/
void scsi_proc_host_add(struct Scsi_Host *shost)
{
struct scsi_host_template *sht = shost->hostt;
struct proc_dir_entry *p;
char name[10];
if (!sht->proc_dir)
return;
sprintf(name,"%d", shost->host_no);
p = proc_create_data(name, S_IRUGO | S_IWUSR,
sht->proc_dir, &proc_scsi_fops, shost);
if (!p)
printk(KERN_ERR "%s: Failed to register host %d in"
"%s\n", __func__, shost->host_no,
sht->proc_name);
}
/**
* scsi_proc_host_rm - remove this host's entry from /proc
* @shost: which host
*/
void scsi_proc_host_rm(struct Scsi_Host *shost)
{
char name[10];
if (!shost->hostt->proc_dir)
return;
sprintf(name,"%d", shost->host_no);
remove_proc_entry(name, shost->hostt->proc_dir);
}
/**
* proc_print_scsidevice - return data about this host
* @dev: A scsi device
* @data: &struct seq_file to output to.
*
* Description: prints Host, Channel, Id, Lun, Vendor, Model, Rev, Type,
* and revision.
*/
static int proc_print_scsidevice(struct device *dev, void *data)
{
struct scsi_device *sdev;
struct seq_file *s = data;
int i;
if (!scsi_is_sdev_device(dev))
goto out;
sdev = to_scsi_device(dev);
seq_printf(s,
"Host: scsi%d Channel: %02d Id: %02d Lun: %02llu\n Vendor: ",
sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
for (i = 0; i < 8; i++) {
if (sdev->vendor[i] >= 0x20)
seq_putc(s, sdev->vendor[i]);
else
seq_putc(s, ' ');
}
seq_puts(s, " Model: ");
for (i = 0; i < 16; i++) {
if (sdev->model[i] >= 0x20)
seq_putc(s, sdev->model[i]);
else
seq_putc(s, ' ');
}
seq_puts(s, " Rev: ");
for (i = 0; i < 4; i++) {
if (sdev->rev[i] >= 0x20)
seq_putc(s, sdev->rev[i]);
else
seq_putc(s, ' ');
}
seq_putc(s, '\n');
seq_printf(s, " Type: %s ", scsi_device_type(sdev->type));
seq_printf(s, " ANSI SCSI revision: %02x",
sdev->scsi_level - (sdev->scsi_level > 1));
if (sdev->scsi_level == 2)
seq_puts(s, " CCS\n");
else
seq_putc(s, '\n');
out:
return 0;
}
/**
* scsi_add_single_device - Respond to user request to probe for/add device
* @host: user-supplied decimal integer
* @channel: user-supplied decimal integer
* @id: user-supplied decimal integer
* @lun: user-supplied decimal integer
*
* Description: called by writing "scsi add-single-device" to /proc/scsi/scsi.
*
* does scsi_host_lookup() and either user_scan() if that transport
* type supports it, or else scsi_scan_host_selected()
*
* Note: this seems to be aimed exclusively at SCSI parallel busses.
*/
static int scsi_add_single_device(uint host, uint channel, uint id, uint lun)
{
struct Scsi_Host *shost;
int error = -ENXIO;
shost = scsi_host_lookup(host);
if (!shost)
return error;
if (shost->transportt->user_scan)
error = shost->transportt->user_scan(shost, channel, id, lun);
else
error = scsi_scan_host_selected(shost, channel, id, lun,
SCSI_SCAN_MANUAL);
scsi_host_put(shost);
return error;
}
/**
* scsi_remove_single_device - Respond to user request to remove a device
* @host: user-supplied decimal integer
* @channel: user-supplied decimal integer
* @id: user-supplied decimal integer
* @lun: user-supplied decimal integer
*
* Description: called by writing "scsi remove-single-device" to
* /proc/scsi/scsi. Does a scsi_device_lookup() and scsi_remove_device()
*/
static int scsi_remove_single_device(uint host, uint channel, uint id, uint lun)
{
struct scsi_device *sdev;
struct Scsi_Host *shost;
int error = -ENXIO;
shost = scsi_host_lookup(host);
if (!shost)
return error;
sdev = scsi_device_lookup(shost, channel, id, lun);
if (sdev) {
scsi_remove_device(sdev);
scsi_device_put(sdev);
error = 0;
}
scsi_host_put(shost);
return error;
}
/**
* proc_scsi_write - handle writes to /proc/scsi/scsi
* @file: not used
* @buf: buffer to write
* @length: length of buf, at most PAGE_SIZE
* @ppos: not used
*
* Description: this provides a legacy mechanism to add or remove devices by
* Host, Channel, ID, and Lun. To use,
* "echo 'scsi add-single-device 0 1 2 3' > /proc/scsi/scsi" or
* "echo 'scsi remove-single-device 0 1 2 3' > /proc/scsi/scsi" with
* "0 1 2 3" replaced by the Host, Channel, Id, and Lun.
*
* Note: this seems to be aimed at parallel SCSI. Most modern busses (USB,
* SATA, Firewire, Fibre Channel, etc) dynamically assign these values to
* provide a unique identifier and nothing more.
*/
static ssize_t proc_scsi_write(struct file *file, const char __user *buf,
size_t length, loff_t *ppos)
{
int host, channel, id, lun;
char *buffer, *p;
int err;
if (!buf || length > PAGE_SIZE)
return -EINVAL;
buffer = (char *)__get_free_page(GFP_KERNEL);
if (!buffer)
return -ENOMEM;
err = -EFAULT;
if (copy_from_user(buffer, buf, length))
goto out;
err = -EINVAL;
if (length < PAGE_SIZE)
buffer[length] = '\0';
else if (buffer[PAGE_SIZE-1])
goto out;
/*
* Usage: echo "scsi add-single-device 0 1 2 3" >/proc/scsi/scsi
* with "0 1 2 3" replaced by your "Host Channel Id Lun".
*/
if (!strncmp("scsi add-single-device", buffer, 22)) {
p = buffer + 23;
host = simple_strtoul(p, &p, 0);
channel = simple_strtoul(p + 1, &p, 0);
id = simple_strtoul(p + 1, &p, 0);
lun = simple_strtoul(p + 1, &p, 0);
err = scsi_add_single_device(host, channel, id, lun);
/*
* Usage: echo "scsi remove-single-device 0 1 2 3" >/proc/scsi/scsi
* with "0 1 2 3" replaced by your "Host Channel Id Lun".
*/
} else if (!strncmp("scsi remove-single-device", buffer, 25)) {
p = buffer + 26;
host = simple_strtoul(p, &p, 0);
channel = simple_strtoul(p + 1, &p, 0);
id = simple_strtoul(p + 1, &p, 0);
lun = simple_strtoul(p + 1, &p, 0);
err = scsi_remove_single_device(host, channel, id, lun);
}
/*
* convert success returns so that we return the
* number of bytes consumed.
*/
if (!err)
err = length;
out:
free_page((unsigned long)buffer);
return err;
}
static int always_match(struct device *dev, void *data)
{
return 1;
}
static inline struct device *next_scsi_device(struct device *start)
{
struct device *next = bus_find_device(&scsi_bus_type, start, NULL,
always_match);
put_device(start);
return next;
}
static void *scsi_seq_start(struct seq_file *sfile, loff_t *pos)
{
struct device *dev = NULL;
loff_t n = *pos;
while ((dev = next_scsi_device(dev))) {
if (!n--)
break;
sfile->private++;
}
return dev;
}
static void *scsi_seq_next(struct seq_file *sfile, void *v, loff_t *pos)
{
(*pos)++;
sfile->private++;
return next_scsi_device(v);
}
static void scsi_seq_stop(struct seq_file *sfile, void *v)
{
put_device(v);
}
static int scsi_seq_show(struct seq_file *sfile, void *dev)
{
if (!sfile->private)
seq_puts(sfile, "Attached devices:\n");
return proc_print_scsidevice(dev, sfile);
}
static const struct seq_operations scsi_seq_ops = {
.start = scsi_seq_start,
.next = scsi_seq_next,
.stop = scsi_seq_stop,
.show = scsi_seq_show
};
/**
* proc_scsi_open - glue function
* @inode: not used
* @file: passed to single_open()
*
* Associates proc_scsi_show with this file
*/
static int proc_scsi_open(struct inode *inode, struct file *file)
{
/*
* We don't really need this for the write case but it doesn't
* harm either.
*/
return seq_open(file, &scsi_seq_ops);
}
static const struct file_operations proc_scsi_operations = {
.owner = THIS_MODULE,
.open = proc_scsi_open,
.read = seq_read,
.write = proc_scsi_write,
.llseek = seq_lseek,
.release = seq_release,
};
/**
* scsi_init_procfs - create scsi and scsi/scsi in procfs
*/
int __init scsi_init_procfs(void)
{
struct proc_dir_entry *pde;
proc_scsi = proc_mkdir("scsi", NULL);
if (!proc_scsi)
goto err1;
pde = proc_create("scsi/scsi", 0, NULL, &proc_scsi_operations);
if (!pde)
goto err2;
return 0;
err2:
remove_proc_entry("scsi", NULL);
err1:
return -ENOMEM;
}
/**
* scsi_exit_procfs - Remove scsi/scsi and scsi from procfs
*/
void scsi_exit_procfs(void)
{
remove_proc_entry("scsi/scsi", NULL);
remove_proc_entry("scsi", NULL);
}