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>
2017-11-01 22:07:57 +08:00
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// SPDX-License-Identifier: GPL-2.0
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2011-09-16 12:45:36 +08:00
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/*
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* Code extracted from drivers/block/genhd.c
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* Copyright (C) 1991-1998 Linus Torvalds
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* Re-organised Feb 1998 Russell King
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*
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* We now have independent partition support from the
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* block drivers, which allows all the partition code to
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* be grouped in one location, and it to be mostly self
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* contained.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/kmod.h>
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#include <linux/ctype.h>
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#include <linux/genhd.h>
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#include <linux/blktrace_api.h>
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#include "partitions/check.h"
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#ifdef CONFIG_BLK_DEV_MD
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extern void md_autodetect_dev(dev_t dev);
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#endif
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/*
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* disk_name() is used by partition check code and the genhd driver.
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* It formats the devicename of the indicated disk into
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* the supplied buffer (of size at least 32), and returns
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* a pointer to that same buffer (for convenience).
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*/
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char *disk_name(struct gendisk *hd, int partno, char *buf)
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{
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if (!partno)
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snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name);
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else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1]))
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snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, partno);
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else
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snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, partno);
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return buf;
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}
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const char *bdevname(struct block_device *bdev, char *buf)
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{
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return disk_name(bdev->bd_disk, bdev->bd_part->partno, buf);
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}
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EXPORT_SYMBOL(bdevname);
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2018-02-27 20:10:18 +08:00
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const char *bio_devname(struct bio *bio, char *buf)
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{
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return disk_name(bio->bi_disk, bio->bi_partno, buf);
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}
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EXPORT_SYMBOL(bio_devname);
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2011-09-16 12:45:36 +08:00
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/*
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* There's very little reason to use this, you should really
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* have a struct block_device just about everywhere and use
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* bdevname() instead.
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*/
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const char *__bdevname(dev_t dev, char *buffer)
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{
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scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)",
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MAJOR(dev), MINOR(dev));
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return buffer;
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}
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EXPORT_SYMBOL(__bdevname);
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static ssize_t part_partition_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct hd_struct *p = dev_to_part(dev);
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return sprintf(buf, "%d\n", p->partno);
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}
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static ssize_t part_start_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct hd_struct *p = dev_to_part(dev);
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return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect);
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}
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ssize_t part_size_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct hd_struct *p = dev_to_part(dev);
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2012-08-01 18:24:18 +08:00
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return sprintf(buf, "%llu\n",(unsigned long long)part_nr_sects_read(p));
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2011-09-16 12:45:36 +08:00
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}
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static ssize_t part_ro_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct hd_struct *p = dev_to_part(dev);
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return sprintf(buf, "%d\n", p->policy ? 1 : 0);
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}
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static ssize_t part_alignment_offset_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct hd_struct *p = dev_to_part(dev);
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return sprintf(buf, "%llu\n", (unsigned long long)p->alignment_offset);
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}
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static ssize_t part_discard_alignment_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct hd_struct *p = dev_to_part(dev);
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return sprintf(buf, "%u\n", p->discard_alignment);
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}
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ssize_t part_stat_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct hd_struct *p = dev_to_part(dev);
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2017-09-22 03:17:16 +08:00
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struct request_queue *q = part_to_disk(p)->queue;
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2018-12-07 00:41:21 +08:00
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unsigned int inflight;
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2011-09-16 12:45:36 +08:00
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2018-12-07 00:41:21 +08:00
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inflight = part_in_flight(q, p);
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2024-06-11 20:26:44 +08:00
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sync_io_ticks(p, inflight > 0 || blk_queue_quiesced(q));
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2011-09-16 12:45:36 +08:00
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return sprintf(buf,
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"%8lu %8lu %8llu %8u "
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"%8lu %8lu %8llu %8u "
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2018-07-18 19:47:40 +08:00
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"%8u %8u %8u "
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"%8lu %8lu %8llu %8u"
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2011-09-16 12:45:36 +08:00
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"\n",
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2018-07-18 19:47:38 +08:00
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part_stat_read(p, ios[STAT_READ]),
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part_stat_read(p, merges[STAT_READ]),
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(unsigned long long)part_stat_read(p, sectors[STAT_READ]),
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2018-09-22 07:44:34 +08:00
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(unsigned int)part_stat_read_msecs(p, STAT_READ),
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2018-07-18 19:47:38 +08:00
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part_stat_read(p, ios[STAT_WRITE]),
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part_stat_read(p, merges[STAT_WRITE]),
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(unsigned long long)part_stat_read(p, sectors[STAT_WRITE]),
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2018-09-22 07:44:34 +08:00
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(unsigned int)part_stat_read_msecs(p, STAT_WRITE),
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2018-12-07 00:41:21 +08:00
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inflight,
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2011-09-16 12:45:36 +08:00
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jiffies_to_msecs(part_stat_read(p, io_ticks)),
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2018-07-18 19:47:40 +08:00
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jiffies_to_msecs(part_stat_read(p, time_in_queue)),
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part_stat_read(p, ios[STAT_DISCARD]),
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part_stat_read(p, merges[STAT_DISCARD]),
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(unsigned long long)part_stat_read(p, sectors[STAT_DISCARD]),
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2018-09-22 07:44:34 +08:00
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(unsigned int)part_stat_read_msecs(p, STAT_DISCARD));
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2011-09-16 12:45:36 +08:00
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}
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2018-04-26 15:21:59 +08:00
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ssize_t part_inflight_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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2011-09-16 12:45:36 +08:00
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{
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struct hd_struct *p = dev_to_part(dev);
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2018-04-26 15:21:59 +08:00
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struct request_queue *q = part_to_disk(p)->queue;
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unsigned int inflight[2];
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2011-09-16 12:45:36 +08:00
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2018-04-26 15:21:59 +08:00
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part_in_flight_rw(q, p, inflight);
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return sprintf(buf, "%8u %8u\n", inflight[0], inflight[1]);
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2011-09-16 12:45:36 +08:00
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}
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#ifdef CONFIG_FAIL_MAKE_REQUEST
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ssize_t part_fail_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct hd_struct *p = dev_to_part(dev);
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return sprintf(buf, "%d\n", p->make_it_fail);
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}
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ssize_t part_fail_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct hd_struct *p = dev_to_part(dev);
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int i;
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if (count > 0 && sscanf(buf, "%d", &i) > 0)
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p->make_it_fail = (i == 0) ? 0 : 1;
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return count;
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}
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#endif
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2018-05-25 03:38:59 +08:00
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static DEVICE_ATTR(partition, 0444, part_partition_show, NULL);
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static DEVICE_ATTR(start, 0444, part_start_show, NULL);
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static DEVICE_ATTR(size, 0444, part_size_show, NULL);
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static DEVICE_ATTR(ro, 0444, part_ro_show, NULL);
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static DEVICE_ATTR(alignment_offset, 0444, part_alignment_offset_show, NULL);
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static DEVICE_ATTR(discard_alignment, 0444, part_discard_alignment_show, NULL);
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static DEVICE_ATTR(stat, 0444, part_stat_show, NULL);
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static DEVICE_ATTR(inflight, 0444, part_inflight_show, NULL);
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2011-09-16 12:45:36 +08:00
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#ifdef CONFIG_FAIL_MAKE_REQUEST
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static struct device_attribute dev_attr_fail =
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2018-05-25 03:38:59 +08:00
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__ATTR(make-it-fail, 0644, part_fail_show, part_fail_store);
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2011-09-16 12:45:36 +08:00
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#endif
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static struct attribute *part_attrs[] = {
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&dev_attr_partition.attr,
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&dev_attr_start.attr,
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&dev_attr_size.attr,
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&dev_attr_ro.attr,
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&dev_attr_alignment_offset.attr,
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&dev_attr_discard_alignment.attr,
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&dev_attr_stat.attr,
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&dev_attr_inflight.attr,
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#ifdef CONFIG_FAIL_MAKE_REQUEST
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&dev_attr_fail.attr,
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#endif
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NULL
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};
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static struct attribute_group part_attr_group = {
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.attrs = part_attrs,
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};
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static const struct attribute_group *part_attr_groups[] = {
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&part_attr_group,
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#ifdef CONFIG_BLK_DEV_IO_TRACE
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&blk_trace_attr_group,
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#endif
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NULL
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};
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static void part_release(struct device *dev)
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{
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struct hd_struct *p = dev_to_part(dev);
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2014-08-26 23:05:36 +08:00
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blk_free_devt(dev->devt);
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2015-07-16 11:16:44 +08:00
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hd_free_part(p);
|
2011-09-16 12:45:36 +08:00
|
|
|
kfree(p);
|
|
|
|
|
}
|
|
|
|
|
|
2016-03-16 05:53:26 +08:00
|
|
|
static int part_uevent(struct device *dev, struct kobj_uevent_env *env)
|
|
|
|
|
{
|
|
|
|
|
struct hd_struct *part = dev_to_part(dev);
|
|
|
|
|
|
|
|
|
|
add_uevent_var(env, "PARTN=%u", part->partno);
|
|
|
|
|
if (part->info && part->info->volname[0])
|
|
|
|
|
add_uevent_var(env, "PARTNAME=%s", part->info->volname);
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
2011-09-16 12:45:36 +08:00
|
|
|
struct device_type part_type = {
|
|
|
|
|
.name = "partition",
|
|
|
|
|
.groups = part_attr_groups,
|
|
|
|
|
.release = part_release,
|
2016-03-16 05:53:26 +08:00
|
|
|
.uevent = part_uevent,
|
2011-09-16 12:45:36 +08:00
|
|
|
};
|
|
|
|
|
|
block: use rcu_work instead of call_rcu to avoid sleep in softirq
We recently got a stack by syzkaller like this:
BUG: sleeping function called from invalid context at mm/slab.h:361
in_atomic(): 1, irqs_disabled(): 0, pid: 6644, name: blkid
INFO: lockdep is turned off.
CPU: 1 PID: 6644 Comm: blkid Not tainted 4.4.163-514.55.6.9.x86_64+ #76
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014
0000000000000000 5ba6a6b879e50c00 ffff8801f6b07b10 ffffffff81cb2194
0000000041b58ab3 ffffffff833c7745 ffffffff81cb2080 5ba6a6b879e50c00
0000000000000000 0000000000000001 0000000000000004 0000000000000000
Call Trace:
<IRQ> [<ffffffff81cb2194>] __dump_stack lib/dump_stack.c:15 [inline]
<IRQ> [<ffffffff81cb2194>] dump_stack+0x114/0x1a0 lib/dump_stack.c:51
[<ffffffff8129a981>] ___might_sleep+0x291/0x490 kernel/sched/core.c:7675
[<ffffffff8129ac33>] __might_sleep+0xb3/0x270 kernel/sched/core.c:7637
[<ffffffff81794c13>] slab_pre_alloc_hook mm/slab.h:361 [inline]
[<ffffffff81794c13>] slab_alloc_node mm/slub.c:2610 [inline]
[<ffffffff81794c13>] slab_alloc mm/slub.c:2692 [inline]
[<ffffffff81794c13>] kmem_cache_alloc_trace+0x2c3/0x5c0 mm/slub.c:2709
[<ffffffff81cbe9a7>] kmalloc include/linux/slab.h:479 [inline]
[<ffffffff81cbe9a7>] kzalloc include/linux/slab.h:623 [inline]
[<ffffffff81cbe9a7>] kobject_uevent_env+0x2c7/0x1150 lib/kobject_uevent.c:227
[<ffffffff81cbf84f>] kobject_uevent+0x1f/0x30 lib/kobject_uevent.c:374
[<ffffffff81cbb5b9>] kobject_cleanup lib/kobject.c:633 [inline]
[<ffffffff81cbb5b9>] kobject_release+0x229/0x440 lib/kobject.c:675
[<ffffffff81cbb0a2>] kref_sub include/linux/kref.h:73 [inline]
[<ffffffff81cbb0a2>] kref_put include/linux/kref.h:98 [inline]
[<ffffffff81cbb0a2>] kobject_put+0x72/0xd0 lib/kobject.c:692
[<ffffffff8216f095>] put_device+0x25/0x30 drivers/base/core.c:1237
[<ffffffff81c4cc34>] delete_partition_rcu_cb+0x1d4/0x2f0 block/partition-generic.c:232
[<ffffffff813c08bc>] __rcu_reclaim kernel/rcu/rcu.h:118 [inline]
[<ffffffff813c08bc>] rcu_do_batch kernel/rcu/tree.c:2705 [inline]
[<ffffffff813c08bc>] invoke_rcu_callbacks kernel/rcu/tree.c:2973 [inline]
[<ffffffff813c08bc>] __rcu_process_callbacks kernel/rcu/tree.c:2940 [inline]
[<ffffffff813c08bc>] rcu_process_callbacks+0x59c/0x1c70 kernel/rcu/tree.c:2957
[<ffffffff8120f509>] __do_softirq+0x299/0xe20 kernel/softirq.c:273
[<ffffffff81210496>] invoke_softirq kernel/softirq.c:350 [inline]
[<ffffffff81210496>] irq_exit+0x216/0x2c0 kernel/softirq.c:391
[<ffffffff82c2cd7b>] exiting_irq arch/x86/include/asm/apic.h:652 [inline]
[<ffffffff82c2cd7b>] smp_apic_timer_interrupt+0x8b/0xc0 arch/x86/kernel/apic/apic.c:926
[<ffffffff82c2bc25>] apic_timer_interrupt+0xa5/0xb0 arch/x86/entry/entry_64.S:746
<EOI> [<ffffffff814cbf40>] ? audit_kill_trees+0x180/0x180
[<ffffffff8187d2f7>] fd_install+0x57/0x80 fs/file.c:626
[<ffffffff8180989e>] do_sys_open+0x45e/0x550 fs/open.c:1043
[<ffffffff818099c2>] SYSC_open fs/open.c:1055 [inline]
[<ffffffff818099c2>] SyS_open+0x32/0x40 fs/open.c:1050
[<ffffffff82c299e1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
In softirq context, we call rcu callback function delete_partition_rcu_cb(),
which may allocate memory by kzalloc with GFP_KERNEL flag. If the
allocation cannot be satisfied, it may sleep. However, That is not allowed
in softirq contex.
Although we found this problem on linux 4.4, the latest kernel version
seems to have this problem as well. And it is very similar to the
previous one:
https://lkml.org/lkml/2018/7/9/391
Fix it by using RCU workqueue, which allows sleep.
Reviewed-by: Paul E. McKenney <paulmck@linux.ibm.com>
Signed-off-by: Yufen Yu <yuyufen@huawei.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-11-28 16:42:01 +08:00
|
|
|
static void delete_partition_work_fn(struct work_struct *work)
|
2011-09-16 12:45:36 +08:00
|
|
|
{
|
block: use rcu_work instead of call_rcu to avoid sleep in softirq
We recently got a stack by syzkaller like this:
BUG: sleeping function called from invalid context at mm/slab.h:361
in_atomic(): 1, irqs_disabled(): 0, pid: 6644, name: blkid
INFO: lockdep is turned off.
CPU: 1 PID: 6644 Comm: blkid Not tainted 4.4.163-514.55.6.9.x86_64+ #76
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014
0000000000000000 5ba6a6b879e50c00 ffff8801f6b07b10 ffffffff81cb2194
0000000041b58ab3 ffffffff833c7745 ffffffff81cb2080 5ba6a6b879e50c00
0000000000000000 0000000000000001 0000000000000004 0000000000000000
Call Trace:
<IRQ> [<ffffffff81cb2194>] __dump_stack lib/dump_stack.c:15 [inline]
<IRQ> [<ffffffff81cb2194>] dump_stack+0x114/0x1a0 lib/dump_stack.c:51
[<ffffffff8129a981>] ___might_sleep+0x291/0x490 kernel/sched/core.c:7675
[<ffffffff8129ac33>] __might_sleep+0xb3/0x270 kernel/sched/core.c:7637
[<ffffffff81794c13>] slab_pre_alloc_hook mm/slab.h:361 [inline]
[<ffffffff81794c13>] slab_alloc_node mm/slub.c:2610 [inline]
[<ffffffff81794c13>] slab_alloc mm/slub.c:2692 [inline]
[<ffffffff81794c13>] kmem_cache_alloc_trace+0x2c3/0x5c0 mm/slub.c:2709
[<ffffffff81cbe9a7>] kmalloc include/linux/slab.h:479 [inline]
[<ffffffff81cbe9a7>] kzalloc include/linux/slab.h:623 [inline]
[<ffffffff81cbe9a7>] kobject_uevent_env+0x2c7/0x1150 lib/kobject_uevent.c:227
[<ffffffff81cbf84f>] kobject_uevent+0x1f/0x30 lib/kobject_uevent.c:374
[<ffffffff81cbb5b9>] kobject_cleanup lib/kobject.c:633 [inline]
[<ffffffff81cbb5b9>] kobject_release+0x229/0x440 lib/kobject.c:675
[<ffffffff81cbb0a2>] kref_sub include/linux/kref.h:73 [inline]
[<ffffffff81cbb0a2>] kref_put include/linux/kref.h:98 [inline]
[<ffffffff81cbb0a2>] kobject_put+0x72/0xd0 lib/kobject.c:692
[<ffffffff8216f095>] put_device+0x25/0x30 drivers/base/core.c:1237
[<ffffffff81c4cc34>] delete_partition_rcu_cb+0x1d4/0x2f0 block/partition-generic.c:232
[<ffffffff813c08bc>] __rcu_reclaim kernel/rcu/rcu.h:118 [inline]
[<ffffffff813c08bc>] rcu_do_batch kernel/rcu/tree.c:2705 [inline]
[<ffffffff813c08bc>] invoke_rcu_callbacks kernel/rcu/tree.c:2973 [inline]
[<ffffffff813c08bc>] __rcu_process_callbacks kernel/rcu/tree.c:2940 [inline]
[<ffffffff813c08bc>] rcu_process_callbacks+0x59c/0x1c70 kernel/rcu/tree.c:2957
[<ffffffff8120f509>] __do_softirq+0x299/0xe20 kernel/softirq.c:273
[<ffffffff81210496>] invoke_softirq kernel/softirq.c:350 [inline]
[<ffffffff81210496>] irq_exit+0x216/0x2c0 kernel/softirq.c:391
[<ffffffff82c2cd7b>] exiting_irq arch/x86/include/asm/apic.h:652 [inline]
[<ffffffff82c2cd7b>] smp_apic_timer_interrupt+0x8b/0xc0 arch/x86/kernel/apic/apic.c:926
[<ffffffff82c2bc25>] apic_timer_interrupt+0xa5/0xb0 arch/x86/entry/entry_64.S:746
<EOI> [<ffffffff814cbf40>] ? audit_kill_trees+0x180/0x180
[<ffffffff8187d2f7>] fd_install+0x57/0x80 fs/file.c:626
[<ffffffff8180989e>] do_sys_open+0x45e/0x550 fs/open.c:1043
[<ffffffff818099c2>] SYSC_open fs/open.c:1055 [inline]
[<ffffffff818099c2>] SyS_open+0x32/0x40 fs/open.c:1050
[<ffffffff82c299e1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
In softirq context, we call rcu callback function delete_partition_rcu_cb(),
which may allocate memory by kzalloc with GFP_KERNEL flag. If the
allocation cannot be satisfied, it may sleep. However, That is not allowed
in softirq contex.
Although we found this problem on linux 4.4, the latest kernel version
seems to have this problem as well. And it is very similar to the
previous one:
https://lkml.org/lkml/2018/7/9/391
Fix it by using RCU workqueue, which allows sleep.
Reviewed-by: Paul E. McKenney <paulmck@linux.ibm.com>
Signed-off-by: Yufen Yu <yuyufen@huawei.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-11-28 16:42:01 +08:00
|
|
|
struct hd_struct *part = container_of(to_rcu_work(work), struct hd_struct,
|
|
|
|
|
rcu_work);
|
2011-09-16 12:45:36 +08:00
|
|
|
|
|
|
|
|
part->start_sect = 0;
|
|
|
|
|
part->nr_sects = 0;
|
|
|
|
|
part_stat_set_all(part, 0);
|
|
|
|
|
put_device(part_to_dev(part));
|
|
|
|
|
}
|
|
|
|
|
|
2015-07-16 11:16:45 +08:00
|
|
|
void __delete_partition(struct percpu_ref *ref)
|
2011-09-16 12:45:36 +08:00
|
|
|
{
|
2015-07-16 11:16:45 +08:00
|
|
|
struct hd_struct *part = container_of(ref, struct hd_struct, ref);
|
block: use rcu_work instead of call_rcu to avoid sleep in softirq
We recently got a stack by syzkaller like this:
BUG: sleeping function called from invalid context at mm/slab.h:361
in_atomic(): 1, irqs_disabled(): 0, pid: 6644, name: blkid
INFO: lockdep is turned off.
CPU: 1 PID: 6644 Comm: blkid Not tainted 4.4.163-514.55.6.9.x86_64+ #76
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014
0000000000000000 5ba6a6b879e50c00 ffff8801f6b07b10 ffffffff81cb2194
0000000041b58ab3 ffffffff833c7745 ffffffff81cb2080 5ba6a6b879e50c00
0000000000000000 0000000000000001 0000000000000004 0000000000000000
Call Trace:
<IRQ> [<ffffffff81cb2194>] __dump_stack lib/dump_stack.c:15 [inline]
<IRQ> [<ffffffff81cb2194>] dump_stack+0x114/0x1a0 lib/dump_stack.c:51
[<ffffffff8129a981>] ___might_sleep+0x291/0x490 kernel/sched/core.c:7675
[<ffffffff8129ac33>] __might_sleep+0xb3/0x270 kernel/sched/core.c:7637
[<ffffffff81794c13>] slab_pre_alloc_hook mm/slab.h:361 [inline]
[<ffffffff81794c13>] slab_alloc_node mm/slub.c:2610 [inline]
[<ffffffff81794c13>] slab_alloc mm/slub.c:2692 [inline]
[<ffffffff81794c13>] kmem_cache_alloc_trace+0x2c3/0x5c0 mm/slub.c:2709
[<ffffffff81cbe9a7>] kmalloc include/linux/slab.h:479 [inline]
[<ffffffff81cbe9a7>] kzalloc include/linux/slab.h:623 [inline]
[<ffffffff81cbe9a7>] kobject_uevent_env+0x2c7/0x1150 lib/kobject_uevent.c:227
[<ffffffff81cbf84f>] kobject_uevent+0x1f/0x30 lib/kobject_uevent.c:374
[<ffffffff81cbb5b9>] kobject_cleanup lib/kobject.c:633 [inline]
[<ffffffff81cbb5b9>] kobject_release+0x229/0x440 lib/kobject.c:675
[<ffffffff81cbb0a2>] kref_sub include/linux/kref.h:73 [inline]
[<ffffffff81cbb0a2>] kref_put include/linux/kref.h:98 [inline]
[<ffffffff81cbb0a2>] kobject_put+0x72/0xd0 lib/kobject.c:692
[<ffffffff8216f095>] put_device+0x25/0x30 drivers/base/core.c:1237
[<ffffffff81c4cc34>] delete_partition_rcu_cb+0x1d4/0x2f0 block/partition-generic.c:232
[<ffffffff813c08bc>] __rcu_reclaim kernel/rcu/rcu.h:118 [inline]
[<ffffffff813c08bc>] rcu_do_batch kernel/rcu/tree.c:2705 [inline]
[<ffffffff813c08bc>] invoke_rcu_callbacks kernel/rcu/tree.c:2973 [inline]
[<ffffffff813c08bc>] __rcu_process_callbacks kernel/rcu/tree.c:2940 [inline]
[<ffffffff813c08bc>] rcu_process_callbacks+0x59c/0x1c70 kernel/rcu/tree.c:2957
[<ffffffff8120f509>] __do_softirq+0x299/0xe20 kernel/softirq.c:273
[<ffffffff81210496>] invoke_softirq kernel/softirq.c:350 [inline]
[<ffffffff81210496>] irq_exit+0x216/0x2c0 kernel/softirq.c:391
[<ffffffff82c2cd7b>] exiting_irq arch/x86/include/asm/apic.h:652 [inline]
[<ffffffff82c2cd7b>] smp_apic_timer_interrupt+0x8b/0xc0 arch/x86/kernel/apic/apic.c:926
[<ffffffff82c2bc25>] apic_timer_interrupt+0xa5/0xb0 arch/x86/entry/entry_64.S:746
<EOI> [<ffffffff814cbf40>] ? audit_kill_trees+0x180/0x180
[<ffffffff8187d2f7>] fd_install+0x57/0x80 fs/file.c:626
[<ffffffff8180989e>] do_sys_open+0x45e/0x550 fs/open.c:1043
[<ffffffff818099c2>] SYSC_open fs/open.c:1055 [inline]
[<ffffffff818099c2>] SyS_open+0x32/0x40 fs/open.c:1050
[<ffffffff82c299e1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
In softirq context, we call rcu callback function delete_partition_rcu_cb(),
which may allocate memory by kzalloc with GFP_KERNEL flag. If the
allocation cannot be satisfied, it may sleep. However, That is not allowed
in softirq contex.
Although we found this problem on linux 4.4, the latest kernel version
seems to have this problem as well. And it is very similar to the
previous one:
https://lkml.org/lkml/2018/7/9/391
Fix it by using RCU workqueue, which allows sleep.
Reviewed-by: Paul E. McKenney <paulmck@linux.ibm.com>
Signed-off-by: Yufen Yu <yuyufen@huawei.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-11-28 16:42:01 +08:00
|
|
|
INIT_RCU_WORK(&part->rcu_work, delete_partition_work_fn);
|
|
|
|
|
queue_rcu_work(system_wq, &part->rcu_work);
|
2011-09-16 12:45:36 +08:00
|
|
|
}
|
|
|
|
|
|
2017-08-18 07:23:06 +08:00
|
|
|
/*
|
|
|
|
|
* Must be called either with bd_mutex held, before a disk can be opened or
|
|
|
|
|
* after all disk users are gone.
|
|
|
|
|
*/
|
2011-09-16 12:45:36 +08:00
|
|
|
void delete_partition(struct gendisk *disk, int partno)
|
|
|
|
|
{
|
2017-08-18 07:23:06 +08:00
|
|
|
struct disk_part_tbl *ptbl =
|
|
|
|
|
rcu_dereference_protected(disk->part_tbl, 1);
|
2011-09-16 12:45:36 +08:00
|
|
|
struct hd_struct *part;
|
2024-06-12 13:13:20 +08:00
|
|
|
struct block_device *bdev;
|
2011-09-16 12:45:36 +08:00
|
|
|
|
|
|
|
|
if (partno >= ptbl->len)
|
|
|
|
|
return;
|
|
|
|
|
|
2017-08-18 07:23:06 +08:00
|
|
|
part = rcu_dereference_protected(ptbl->part[partno], 1);
|
2011-09-16 12:45:36 +08:00
|
|
|
if (!part)
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
|
|
rcu_assign_pointer(ptbl->part[partno], NULL);
|
|
|
|
|
rcu_assign_pointer(ptbl->last_lookup, NULL);
|
|
|
|
|
kobject_put(part->holder_dir);
|
|
|
|
|
device_del(part_to_dev(part));
|
|
|
|
|
|
2019-04-02 20:06:34 +08:00
|
|
|
/*
|
|
|
|
|
* Remove gendisk pointer from idr so that it cannot be looked up
|
|
|
|
|
* while RCU period before freeing gendisk is running to prevent
|
|
|
|
|
* use-after-free issues. Note that the device number stays
|
|
|
|
|
* "in-use" until we really free the gendisk.
|
|
|
|
|
*/
|
|
|
|
|
blk_invalidate_devt(part_devt(part));
|
2024-06-12 13:13:20 +08:00
|
|
|
|
|
|
|
|
bdev = bdget(part_devt(part));
|
|
|
|
|
if (bdev) {
|
|
|
|
|
remove_inode_hash(bdev->bd_inode);
|
|
|
|
|
bdput(bdev);
|
|
|
|
|
}
|
2015-07-16 11:16:45 +08:00
|
|
|
hd_struct_kill(part);
|
2011-09-16 12:45:36 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static ssize_t whole_disk_show(struct device *dev,
|
|
|
|
|
struct device_attribute *attr, char *buf)
|
|
|
|
|
{
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
2018-05-25 03:38:59 +08:00
|
|
|
static DEVICE_ATTR(whole_disk, 0444, whole_disk_show, NULL);
|
2011-09-16 12:45:36 +08:00
|
|
|
|
2017-08-18 07:23:06 +08:00
|
|
|
/*
|
|
|
|
|
* Must be called either with bd_mutex held, before a disk can be opened or
|
|
|
|
|
* after all disk users are gone.
|
|
|
|
|
*/
|
2011-09-16 12:45:36 +08:00
|
|
|
struct hd_struct *add_partition(struct gendisk *disk, int partno,
|
|
|
|
|
sector_t start, sector_t len, int flags,
|
|
|
|
|
struct partition_meta_info *info)
|
|
|
|
|
{
|
|
|
|
|
struct hd_struct *p;
|
|
|
|
|
dev_t devt = MKDEV(0, 0);
|
|
|
|
|
struct device *ddev = disk_to_dev(disk);
|
|
|
|
|
struct device *pdev;
|
|
|
|
|
struct disk_part_tbl *ptbl;
|
|
|
|
|
const char *dname;
|
|
|
|
|
int err;
|
|
|
|
|
|
|
|
|
|
err = disk_expand_part_tbl(disk, partno);
|
|
|
|
|
if (err)
|
|
|
|
|
return ERR_PTR(err);
|
2017-08-18 07:23:06 +08:00
|
|
|
ptbl = rcu_dereference_protected(disk->part_tbl, 1);
|
2011-09-16 12:45:36 +08:00
|
|
|
|
|
|
|
|
if (ptbl->part[partno])
|
|
|
|
|
return ERR_PTR(-EBUSY);
|
|
|
|
|
|
|
|
|
|
p = kzalloc(sizeof(*p), GFP_KERNEL);
|
|
|
|
|
if (!p)
|
|
|
|
|
return ERR_PTR(-EBUSY);
|
|
|
|
|
|
|
|
|
|
if (!init_part_stats(p)) {
|
|
|
|
|
err = -ENOMEM;
|
|
|
|
|
goto out_free;
|
|
|
|
|
}
|
2012-08-01 18:24:18 +08:00
|
|
|
|
|
|
|
|
seqcount_init(&p->nr_sects_seq);
|
2011-09-16 12:45:36 +08:00
|
|
|
pdev = part_to_dev(p);
|
|
|
|
|
|
|
|
|
|
p->start_sect = start;
|
|
|
|
|
p->alignment_offset =
|
|
|
|
|
queue_limit_alignment_offset(&disk->queue->limits, start);
|
|
|
|
|
p->discard_alignment =
|
|
|
|
|
queue_limit_discard_alignment(&disk->queue->limits, start);
|
|
|
|
|
p->nr_sects = len;
|
|
|
|
|
p->partno = partno;
|
|
|
|
|
p->policy = get_disk_ro(disk);
|
|
|
|
|
|
|
|
|
|
if (info) {
|
|
|
|
|
struct partition_meta_info *pinfo = alloc_part_info(disk);
|
2017-05-23 22:28:36 +08:00
|
|
|
if (!pinfo) {
|
|
|
|
|
err = -ENOMEM;
|
2011-09-16 12:45:36 +08:00
|
|
|
goto out_free_stats;
|
2017-05-23 22:28:36 +08:00
|
|
|
}
|
2011-09-16 12:45:36 +08:00
|
|
|
memcpy(pinfo, info, sizeof(*info));
|
|
|
|
|
p->info = pinfo;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
dname = dev_name(ddev);
|
|
|
|
|
if (isdigit(dname[strlen(dname) - 1]))
|
|
|
|
|
dev_set_name(pdev, "%sp%d", dname, partno);
|
|
|
|
|
else
|
|
|
|
|
dev_set_name(pdev, "%s%d", dname, partno);
|
|
|
|
|
|
|
|
|
|
device_initialize(pdev);
|
|
|
|
|
pdev->class = &block_class;
|
|
|
|
|
pdev->type = &part_type;
|
|
|
|
|
pdev->parent = ddev;
|
|
|
|
|
|
|
|
|
|
err = blk_alloc_devt(p, &devt);
|
|
|
|
|
if (err)
|
|
|
|
|
goto out_free_info;
|
|
|
|
|
pdev->devt = devt;
|
|
|
|
|
|
|
|
|
|
/* delay uevent until 'holders' subdir is created */
|
|
|
|
|
dev_set_uevent_suppress(pdev, 1);
|
|
|
|
|
err = device_add(pdev);
|
|
|
|
|
if (err)
|
|
|
|
|
goto out_put;
|
|
|
|
|
|
2024-06-11 20:26:44 +08:00
|
|
|
if (device_is_hidden(ddev))
|
|
|
|
|
device_hide(pdev);
|
|
|
|
|
|
2011-09-16 12:45:36 +08:00
|
|
|
err = -ENOMEM;
|
|
|
|
|
p->holder_dir = kobject_create_and_add("holders", &pdev->kobj);
|
|
|
|
|
if (!p->holder_dir)
|
|
|
|
|
goto out_del;
|
|
|
|
|
|
|
|
|
|
dev_set_uevent_suppress(pdev, 0);
|
|
|
|
|
if (flags & ADDPART_FLAG_WHOLEDISK) {
|
|
|
|
|
err = device_create_file(pdev, &dev_attr_whole_disk);
|
|
|
|
|
if (err)
|
|
|
|
|
goto out_del;
|
|
|
|
|
}
|
|
|
|
|
|
2016-03-30 08:46:31 +08:00
|
|
|
err = hd_ref_init(p);
|
|
|
|
|
if (err) {
|
|
|
|
|
if (flags & ADDPART_FLAG_WHOLEDISK)
|
|
|
|
|
goto out_remove_file;
|
|
|
|
|
goto out_del;
|
|
|
|
|
}
|
|
|
|
|
|
2011-09-16 12:45:36 +08:00
|
|
|
/* everything is up and running, commence */
|
|
|
|
|
rcu_assign_pointer(ptbl->part[partno], p);
|
|
|
|
|
|
|
|
|
|
/* suppress uevent if the disk suppresses it */
|
|
|
|
|
if (!dev_get_uevent_suppress(ddev))
|
|
|
|
|
kobject_uevent(&pdev->kobj, KOBJ_ADD);
|
2016-03-30 08:46:31 +08:00
|
|
|
return p;
|
2011-09-16 12:45:36 +08:00
|
|
|
|
|
|
|
|
out_free_info:
|
|
|
|
|
free_part_info(p);
|
|
|
|
|
out_free_stats:
|
|
|
|
|
free_part_stats(p);
|
|
|
|
|
out_free:
|
|
|
|
|
kfree(p);
|
|
|
|
|
return ERR_PTR(err);
|
2016-03-30 08:46:31 +08:00
|
|
|
out_remove_file:
|
|
|
|
|
device_remove_file(pdev, &dev_attr_whole_disk);
|
2011-09-16 12:45:36 +08:00
|
|
|
out_del:
|
|
|
|
|
kobject_put(p->holder_dir);
|
|
|
|
|
device_del(pdev);
|
|
|
|
|
out_put:
|
|
|
|
|
put_device(pdev);
|
|
|
|
|
return ERR_PTR(err);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static bool disk_unlock_native_capacity(struct gendisk *disk)
|
|
|
|
|
{
|
|
|
|
|
const struct block_device_operations *bdops = disk->fops;
|
|
|
|
|
|
|
|
|
|
if (bdops->unlock_native_capacity &&
|
|
|
|
|
!(disk->flags & GENHD_FL_NATIVE_CAPACITY)) {
|
|
|
|
|
printk(KERN_CONT "enabling native capacity\n");
|
|
|
|
|
bdops->unlock_native_capacity(disk);
|
|
|
|
|
disk->flags |= GENHD_FL_NATIVE_CAPACITY;
|
|
|
|
|
return true;
|
|
|
|
|
} else {
|
|
|
|
|
printk(KERN_CONT "truncated\n");
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
2012-03-02 17:38:33 +08:00
|
|
|
static int drop_partitions(struct gendisk *disk, struct block_device *bdev)
|
2011-09-16 12:45:36 +08:00
|
|
|
{
|
|
|
|
|
struct disk_part_iter piter;
|
|
|
|
|
struct hd_struct *part;
|
2012-03-02 17:38:33 +08:00
|
|
|
int res;
|
2011-09-16 12:45:36 +08:00
|
|
|
|
2015-11-25 07:30:34 +08:00
|
|
|
if (bdev->bd_part_count || bdev->bd_super)
|
2011-09-16 12:45:36 +08:00
|
|
|
return -EBUSY;
|
|
|
|
|
res = invalidate_partition(disk, 0);
|
|
|
|
|
if (res)
|
|
|
|
|
return res;
|
|
|
|
|
|
|
|
|
|
disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
|
|
|
|
|
while ((part = disk_part_iter_next(&piter)))
|
|
|
|
|
delete_partition(disk, part->partno);
|
|
|
|
|
disk_part_iter_exit(&piter);
|
|
|
|
|
|
2012-03-02 17:38:33 +08:00
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
2016-12-01 15:00:25 +08:00
|
|
|
static bool part_zone_aligned(struct gendisk *disk,
|
|
|
|
|
struct block_device *bdev,
|
|
|
|
|
sector_t from, sector_t size)
|
|
|
|
|
{
|
2017-01-12 22:58:32 +08:00
|
|
|
unsigned int zone_sectors = bdev_zone_sectors(bdev);
|
2016-12-01 15:00:25 +08:00
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* If this function is called, then the disk is a zoned block device
|
|
|
|
|
* (host-aware or host-managed). This can be detected even if the
|
|
|
|
|
* zoned block device support is disabled (CONFIG_BLK_DEV_ZONED not
|
|
|
|
|
* set). In this case, however, only host-aware devices will be seen
|
|
|
|
|
* as a block device is not created for host-managed devices. Without
|
|
|
|
|
* zoned block device support, host-aware drives can still be used as
|
|
|
|
|
* regular block devices (no zone operation) and their zone size will
|
|
|
|
|
* be reported as 0. Allow this case.
|
|
|
|
|
*/
|
2017-01-12 22:58:32 +08:00
|
|
|
if (!zone_sectors)
|
2016-12-01 15:00:25 +08:00
|
|
|
return true;
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Check partition start and size alignement. If the drive has a
|
|
|
|
|
* smaller last runt zone, ignore it and allow the partition to
|
|
|
|
|
* use it. Check the zone size too: it should be a power of 2 number
|
|
|
|
|
* of sectors.
|
|
|
|
|
*/
|
2017-01-12 22:58:32 +08:00
|
|
|
if (WARN_ON_ONCE(!is_power_of_2(zone_sectors))) {
|
2016-12-01 15:00:25 +08:00
|
|
|
u32 rem;
|
|
|
|
|
|
2017-01-12 22:58:32 +08:00
|
|
|
div_u64_rem(from, zone_sectors, &rem);
|
2016-12-01 15:00:25 +08:00
|
|
|
if (rem)
|
|
|
|
|
return false;
|
|
|
|
|
if ((from + size) < get_capacity(disk)) {
|
2017-01-12 22:58:32 +08:00
|
|
|
div_u64_rem(size, zone_sectors, &rem);
|
2016-12-01 15:00:25 +08:00
|
|
|
if (rem)
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
} else {
|
|
|
|
|
|
2017-01-12 22:58:32 +08:00
|
|
|
if (from & (zone_sectors - 1))
|
2016-12-01 15:00:25 +08:00
|
|
|
return false;
|
|
|
|
|
if ((from + size) < get_capacity(disk) &&
|
2017-01-12 22:58:32 +08:00
|
|
|
(size & (zone_sectors - 1)))
|
2016-12-01 15:00:25 +08:00
|
|
|
return false;
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return true;
|
|
|
|
|
}
|
|
|
|
|
|
2012-03-02 17:38:33 +08:00
|
|
|
int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
|
|
|
|
|
{
|
|
|
|
|
struct parsed_partitions *state = NULL;
|
|
|
|
|
struct hd_struct *part;
|
|
|
|
|
int p, highest, res;
|
|
|
|
|
rescan:
|
|
|
|
|
if (state && !IS_ERR(state)) {
|
2013-02-28 09:05:19 +08:00
|
|
|
free_partitions(state);
|
2012-03-02 17:38:33 +08:00
|
|
|
state = NULL;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
res = drop_partitions(disk, bdev);
|
|
|
|
|
if (res)
|
|
|
|
|
return res;
|
|
|
|
|
|
2011-09-16 12:45:36 +08:00
|
|
|
if (disk->fops->revalidate_disk)
|
|
|
|
|
disk->fops->revalidate_disk(disk);
|
2018-05-29 22:42:59 +08:00
|
|
|
check_disk_size_change(disk, bdev, true);
|
2011-09-16 12:45:36 +08:00
|
|
|
bdev->bd_invalidated = 0;
|
|
|
|
|
if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
|
|
|
|
|
return 0;
|
|
|
|
|
if (IS_ERR(state)) {
|
|
|
|
|
/*
|
|
|
|
|
* I/O error reading the partition table. If any
|
|
|
|
|
* partition code tried to read beyond EOD, retry
|
|
|
|
|
* after unlocking native capacity.
|
|
|
|
|
*/
|
|
|
|
|
if (PTR_ERR(state) == -ENOSPC) {
|
|
|
|
|
printk(KERN_WARNING "%s: partition table beyond EOD, ",
|
|
|
|
|
disk->disk_name);
|
|
|
|
|
if (disk_unlock_native_capacity(disk))
|
|
|
|
|
goto rescan;
|
|
|
|
|
}
|
|
|
|
|
return -EIO;
|
|
|
|
|
}
|
|
|
|
|
/*
|
|
|
|
|
* If any partition code tried to read beyond EOD, try
|
|
|
|
|
* unlocking native capacity even if partition table is
|
|
|
|
|
* successfully read as we could be missing some partitions.
|
|
|
|
|
*/
|
|
|
|
|
if (state->access_beyond_eod) {
|
|
|
|
|
printk(KERN_WARNING
|
|
|
|
|
"%s: partition table partially beyond EOD, ",
|
|
|
|
|
disk->disk_name);
|
|
|
|
|
if (disk_unlock_native_capacity(disk))
|
|
|
|
|
goto rescan;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* tell userspace that the media / partition table may have changed */
|
|
|
|
|
kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
|
|
|
|
|
|
|
|
|
|
/* Detect the highest partition number and preallocate
|
|
|
|
|
* disk->part_tbl. This is an optimization and not strictly
|
|
|
|
|
* necessary.
|
|
|
|
|
*/
|
|
|
|
|
for (p = 1, highest = 0; p < state->limit; p++)
|
|
|
|
|
if (state->parts[p].size)
|
|
|
|
|
highest = p;
|
|
|
|
|
|
|
|
|
|
disk_expand_part_tbl(disk, highest);
|
|
|
|
|
|
|
|
|
|
/* add partitions */
|
|
|
|
|
for (p = 1; p < state->limit; p++) {
|
|
|
|
|
sector_t size, from;
|
|
|
|
|
|
|
|
|
|
size = state->parts[p].size;
|
|
|
|
|
if (!size)
|
|
|
|
|
continue;
|
|
|
|
|
|
|
|
|
|
from = state->parts[p].from;
|
|
|
|
|
if (from >= get_capacity(disk)) {
|
|
|
|
|
printk(KERN_WARNING
|
|
|
|
|
"%s: p%d start %llu is beyond EOD, ",
|
|
|
|
|
disk->disk_name, p, (unsigned long long) from);
|
|
|
|
|
if (disk_unlock_native_capacity(disk))
|
|
|
|
|
goto rescan;
|
|
|
|
|
continue;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (from + size > get_capacity(disk)) {
|
|
|
|
|
printk(KERN_WARNING
|
|
|
|
|
"%s: p%d size %llu extends beyond EOD, ",
|
|
|
|
|
disk->disk_name, p, (unsigned long long) size);
|
|
|
|
|
|
|
|
|
|
if (disk_unlock_native_capacity(disk)) {
|
|
|
|
|
/* free state and restart */
|
|
|
|
|
goto rescan;
|
|
|
|
|
} else {
|
|
|
|
|
/*
|
|
|
|
|
* we can not ignore partitions of broken tables
|
|
|
|
|
* created by for example camera firmware, but
|
|
|
|
|
* we limit them to the end of the disk to avoid
|
|
|
|
|
* creating invalid block devices
|
|
|
|
|
*/
|
|
|
|
|
size = get_capacity(disk) - from;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
2016-12-01 15:00:25 +08:00
|
|
|
/*
|
|
|
|
|
* On a zoned block device, partitions should be aligned on the
|
|
|
|
|
* device zone size (i.e. zone boundary crossing not allowed).
|
|
|
|
|
* Otherwise, resetting the write pointer of the last zone of
|
|
|
|
|
* one partition may impact the following partition.
|
|
|
|
|
*/
|
|
|
|
|
if (bdev_is_zoned(bdev) &&
|
|
|
|
|
!part_zone_aligned(disk, bdev, from, size)) {
|
|
|
|
|
printk(KERN_WARNING
|
|
|
|
|
"%s: p%d start %llu+%llu is not zone aligned\n",
|
|
|
|
|
disk->disk_name, p, (unsigned long long) from,
|
|
|
|
|
(unsigned long long) size);
|
|
|
|
|
continue;
|
|
|
|
|
}
|
|
|
|
|
|
2011-09-16 12:45:36 +08:00
|
|
|
part = add_partition(disk, p, from, size,
|
|
|
|
|
state->parts[p].flags,
|
|
|
|
|
&state->parts[p].info);
|
|
|
|
|
if (IS_ERR(part)) {
|
|
|
|
|
printk(KERN_ERR " %s: p%d could not be added: %ld\n",
|
|
|
|
|
disk->disk_name, p, -PTR_ERR(part));
|
|
|
|
|
continue;
|
|
|
|
|
}
|
|
|
|
|
#ifdef CONFIG_BLK_DEV_MD
|
|
|
|
|
if (state->parts[p].flags & ADDPART_FLAG_RAID)
|
|
|
|
|
md_autodetect_dev(part_to_dev(part)->devt);
|
|
|
|
|
#endif
|
|
|
|
|
}
|
2013-02-28 09:05:19 +08:00
|
|
|
free_partitions(state);
|
2011-09-16 12:45:36 +08:00
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
2012-03-02 17:38:33 +08:00
|
|
|
int invalidate_partitions(struct gendisk *disk, struct block_device *bdev)
|
|
|
|
|
{
|
|
|
|
|
int res;
|
|
|
|
|
|
|
|
|
|
if (!bdev->bd_invalidated)
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
res = drop_partitions(disk, bdev);
|
|
|
|
|
if (res)
|
|
|
|
|
return res;
|
|
|
|
|
|
|
|
|
|
set_capacity(disk, 0);
|
2018-05-29 22:42:59 +08:00
|
|
|
check_disk_size_change(disk, bdev, false);
|
2012-03-02 17:38:33 +08:00
|
|
|
bdev->bd_invalidated = 0;
|
|
|
|
|
/* tell userspace that the media / partition table may have changed */
|
|
|
|
|
kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
2016-01-29 12:25:31 +08:00
|
|
|
unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
|
|
|
|
|
{
|
2017-01-28 06:13:15 +08:00
|
|
|
struct address_space *mapping = bdev->bd_inode->i_mapping;
|
2011-09-16 12:45:36 +08:00
|
|
|
struct page *page;
|
|
|
|
|
|
2017-01-28 06:13:15 +08:00
|
|
|
page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_SHIFT-9)), NULL);
|
2011-09-16 12:45:36 +08:00
|
|
|
if (!IS_ERR(page)) {
|
|
|
|
|
if (PageError(page))
|
|
|
|
|
goto fail;
|
|
|
|
|
p->v = page;
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 20:29:47 +08:00
|
|
|
return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_SHIFT - 9)) - 1)) << 9);
|
2011-09-16 12:45:36 +08:00
|
|
|
fail:
|
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.
This promise never materialized. And unlikely will.
We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.
Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.
Let's stop pretending that pages in page cache are special. They are
not.
The changes are pretty straight-forward:
- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;
- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};
- page_cache_get() -> get_page();
- page_cache_release() -> put_page();
This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.
The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.
There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.
virtual patch
@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E
@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT
@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE
@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK
@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)
@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)
@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-04-01 20:29:47 +08:00
|
|
|
put_page(page);
|
2011-09-16 12:45:36 +08:00
|
|
|
}
|
|
|
|
|
p->v = NULL;
|
|
|
|
|
return NULL;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
EXPORT_SYMBOL(read_dev_sector);
|