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
|
2005-04-17 06:20:36 +08:00
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#
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# Block device driver configuration
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#
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2007-07-10 18:26:06 +08:00
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menuconfig BLK_DEV
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bool "Block devices"
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depends on BLOCK
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default y
|
2020-06-14 00:50:22 +08:00
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help
|
2007-08-18 18:56:21 +08:00
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Say Y here to get to see options for various different block device
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drivers. This option alone does not add any kernel code.
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If you say N, all options in this submenu will be skipped and disabled;
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only do this if you know what you are doing.
|
[PATCH] BLOCK: Make it possible to disable the block layer [try #6]
Make it possible to disable the block layer. Not all embedded devices require
it, some can make do with just JFFS2, NFS, ramfs, etc - none of which require
the block layer to be present.
This patch does the following:
(*) Introduces CONFIG_BLOCK to disable the block layer, buffering and blockdev
support.
(*) Adds dependencies on CONFIG_BLOCK to any configuration item that controls
an item that uses the block layer. This includes:
(*) Block I/O tracing.
(*) Disk partition code.
(*) All filesystems that are block based, eg: Ext3, ReiserFS, ISOFS.
(*) The SCSI layer. As far as I can tell, even SCSI chardevs use the
block layer to do scheduling. Some drivers that use SCSI facilities -
such as USB storage - end up disabled indirectly from this.
(*) Various block-based device drivers, such as IDE and the old CDROM
drivers.
(*) MTD blockdev handling and FTL.
(*) JFFS - which uses set_bdev_super(), something it could avoid doing by
taking a leaf out of JFFS2's book.
(*) Makes most of the contents of linux/blkdev.h, linux/buffer_head.h and
linux/elevator.h contingent on CONFIG_BLOCK being set. sector_div() is,
however, still used in places, and so is still available.
(*) Also made contingent are the contents of linux/mpage.h, linux/genhd.h and
parts of linux/fs.h.
(*) Makes a number of files in fs/ contingent on CONFIG_BLOCK.
(*) Makes mm/bounce.c (bounce buffering) contingent on CONFIG_BLOCK.
(*) set_page_dirty() doesn't call __set_page_dirty_buffers() if CONFIG_BLOCK
is not enabled.
(*) fs/no-block.c is created to hold out-of-line stubs and things that are
required when CONFIG_BLOCK is not set:
(*) Default blockdev file operations (to give error ENODEV on opening).
(*) Makes some /proc changes:
(*) /proc/devices does not list any blockdevs.
(*) /proc/diskstats and /proc/partitions are contingent on CONFIG_BLOCK.
(*) Makes some compat ioctl handling contingent on CONFIG_BLOCK.
(*) If CONFIG_BLOCK is not defined, makes sys_quotactl() return -ENODEV if
given command other than Q_SYNC or if a special device is specified.
(*) In init/do_mounts.c, no reference is made to the blockdev routines if
CONFIG_BLOCK is not defined. This does not prohibit NFS roots or JFFS2.
(*) The bdflush, ioprio_set and ioprio_get syscalls can now be absent (return
error ENOSYS by way of cond_syscall if so).
(*) The seclvl_bd_claim() and seclvl_bd_release() security calls do nothing if
CONFIG_BLOCK is not set, since they can't then happen.
Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2006-10-01 02:45:40 +08:00
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2007-07-10 18:26:06 +08:00
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if BLK_DEV
|
2005-04-17 06:20:36 +08:00
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2020-11-20 09:55:19 +08:00
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source "drivers/block/null_blk/Kconfig"
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2013-10-25 18:52:25 +08:00
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2005-04-17 06:20:36 +08:00
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config BLK_DEV_FD
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tristate "Normal floppy disk support"
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2005-09-06 08:48:42 +08:00
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depends on ARCH_MAY_HAVE_PC_FDC
|
2020-06-14 00:50:22 +08:00
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help
|
2005-04-17 06:20:36 +08:00
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If you want to use the floppy disk drive(s) of your PC under Linux,
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say Y. Information about this driver, especially important for IBM
|
2008-11-14 05:33:24 +08:00
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Thinkpad users, is contained in
|
2019-06-18 22:47:10 +08:00
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<file:Documentation/admin-guide/blockdev/floppy.rst>.
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2005-04-17 06:20:36 +08:00
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That file also contains the location of the Floppy driver FAQ as
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well as location of the fdutils package used to configure additional
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parameters of the driver at run time.
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To compile this driver as a module, choose M here: the
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module will be called floppy.
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config AMIGA_FLOPPY
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tristate "Amiga floppy support"
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depends on AMIGA
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config ATARI_FLOPPY
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tristate "Atari floppy support"
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depends on ATARI
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config MAC_FLOPPY
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tristate "Support for PowerMac floppy"
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depends on PPC_PMAC && !PPC_PMAC64
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help
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If you have a SWIM-3 (Super Woz Integrated Machine 3; from Apple)
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floppy controller, say Y here. Most commonly found in PowerMacs.
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2008-11-15 23:10:10 +08:00
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config BLK_DEV_SWIM
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tristate "Support for SWIM Macintosh floppy"
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2021-04-06 14:17:25 +08:00
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depends on M68K && MAC && !HIGHMEM
|
2008-11-15 23:10:10 +08:00
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help
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You should select this option if you want floppy support
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and you don't have a II, IIfx, Q900, Q950 or AV series.
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2005-04-17 06:20:36 +08:00
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config AMIGA_Z2RAM
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tristate "Amiga Zorro II ramdisk support"
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depends on ZORRO
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help
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This enables support for using Chip RAM and Zorro II RAM as a
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ramdisk or as a swap partition. Say Y if you want to include this
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driver in the kernel.
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To compile this driver as a module, choose M here: the
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module will be called z2ram.
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2021-01-23 15:53:27 +08:00
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config N64CART
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bool "N64 cart support"
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depends on MACH_NINTENDO64
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help
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Support for the N64 cart.
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2017-10-31 00:02:19 +08:00
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config CDROM
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2017-11-04 01:00:03 +08:00
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tristate
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2017-10-31 00:02:19 +08:00
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2010-05-11 15:02:55 +08:00
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config GDROM
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tristate "SEGA Dreamcast GD-ROM drive"
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depends on SH_DREAMCAST
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2017-10-31 00:02:19 +08:00
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select CDROM
|
2010-05-11 15:02:55 +08:00
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help
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|
A standard SEGA Dreamcast comes with a modified CD ROM drive called a
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"GD-ROM" by SEGA to signify it is capable of reading special disks
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with up to 1 GB of data. This drive will also read standard CD ROM
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disks. Select this option to access any disks in your GD ROM drive.
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Most users will want to say "Y" here.
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You can also build this as a module which will be called gdrom.
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2005-04-17 06:20:36 +08:00
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config PARIDE
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tristate "Parallel port IDE device support"
|
2006-01-06 16:19:49 +08:00
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depends on PARPORT_PC
|
2020-06-14 00:50:22 +08:00
|
|
|
help
|
2005-04-17 06:20:36 +08:00
|
|
|
There are many external CD-ROM and disk devices that connect through
|
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|
|
your computer's parallel port. Most of them are actually IDE devices
|
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using a parallel port IDE adapter. This option enables the PARIDE
|
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subsystem which contains drivers for many of these external drives.
|
2019-06-18 22:47:10 +08:00
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Read <file:Documentation/admin-guide/blockdev/paride.rst> for more information.
|
2005-04-17 06:20:36 +08:00
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If you have said Y to the "Parallel-port support" configuration
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option, you may share a single port between your printer and other
|
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parallel port devices. Answer Y to build PARIDE support into your
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kernel, or M if you would like to build it as a loadable module. If
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your parallel port support is in a loadable module, you must build
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PARIDE as a module. If you built PARIDE support into your kernel,
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you may still build the individual protocol modules and high-level
|
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drivers as loadable modules. If you build this support as a module,
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it will be called paride.
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To use the PARIDE support, you must say Y or M here and also to at
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least one high-level driver (e.g. "Parallel port IDE disks",
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"Parallel port ATAPI CD-ROMs", "Parallel port ATAPI disks" etc.) and
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to at least one protocol driver (e.g. "ATEN EH-100 protocol",
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"MicroSolutions backpack protocol", "DataStor Commuter protocol"
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etc.).
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source "drivers/block/paride/Kconfig"
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|
2011-08-30 22:34:26 +08:00
|
|
|
source "drivers/block/mtip32xx/Kconfig"
|
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|
zram: promote zram from staging
Zram has lived in staging for a LONG LONG time and have been
fixed/improved by many contributors so code is clean and stable now. Of
course, there are lots of product using zram in real practice.
The major TV companys have used zram as swap since two years ago and
recently our production team released android smart phone with zram
which is used as swap, too and recently Android Kitkat start to use zram
for small memory smart phone. And there was a report Google released
their ChromeOS with zram, too and cyanogenmod have been used zram long
time ago. And I heard some disto have used zram block device for tmpfs.
In addition, I saw many report from many other peoples. For example,
Lubuntu start to use it.
The benefit of zram is very clear. With my experience, one of the
benefit was to remove jitter of video application with backgroud memory
pressure. It would be effect of efficient memory usage by compression
but more issue is whether swap is there or not in the system. Recent
mobile platforms have used JAVA so there are many anonymous pages. But
embedded system normally are reluctant to use eMMC or SDCard as swap
because there is wear-leveling and latency issues so if we do not use
swap, it means we can't reclaim anoymous pages and at last, we could
encounter OOM kill. :(
Although we have real storage as swap, it was a problem, too. Because
it sometime ends up making system very unresponsible caused by slow swap
storage performance.
Quote from Luigi on Google
"Since Chrome OS was mentioned: the main reason why we don't use swap
to a disk (rotating or SSD) is because it doesn't degrade gracefully
and leads to a bad interactive experience. Generally we prefer to
manage RAM at a higher level, by transparently killing and restarting
processes. But we noticed that zram is fast enough to be competitive
with the latter, and it lets us make more efficient use of the
available RAM. " and he announced.
http://www.spinics.net/lists/linux-mm/msg57717.html
Other uses case is to use zram for block device. Zram is block device
so anyone can format the block device and mount on it so some guys on
the internet start zram as /var/tmp.
http://forums.gentoo.org/viewtopic-t-838198-start-0.html
Let's promote zram and enhance/maintain it instead of removing.
Signed-off-by: Minchan Kim <minchan@kernel.org>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Nitin Gupta <ngupta@vflare.org>
Acked-by: Pekka Enberg <penberg@kernel.org>
Cc: Bob Liu <bob.liu@oracle.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Luigi Semenzato <semenzato@google.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Seth Jennings <sjenning@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-01-31 07:45:52 +08:00
|
|
|
source "drivers/block/zram/Kconfig"
|
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
config BLK_DEV_UBD
|
|
|
|
|
bool "Virtual block device"
|
|
|
|
|
depends on UML
|
2020-06-14 00:50:22 +08:00
|
|
|
help
|
2005-04-17 06:20:36 +08:00
|
|
|
The User-Mode Linux port includes a driver called UBD which will let
|
|
|
|
|
you access arbitrary files on the host computer as block devices.
|
|
|
|
|
Unless you know that you do not need such virtual block devices say
|
|
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Y here.
|
|
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|
|
config BLK_DEV_UBD_SYNC
|
|
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|
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bool "Always do synchronous disk IO for UBD"
|
|
|
|
|
depends on BLK_DEV_UBD
|
2020-06-14 00:50:22 +08:00
|
|
|
help
|
2005-04-17 06:20:36 +08:00
|
|
|
Writes to the virtual block device are not immediately written to the
|
|
|
|
|
host's disk; this may cause problems if, for example, the User-Mode
|
|
|
|
|
Linux 'Virtual Machine' uses a journalling filesystem and the host
|
|
|
|
|
computer crashes.
|
|
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|
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|
Synchronous operation (i.e. always writing data to the host's disk
|
|
|
|
|
immediately) is configurable on a per-UBD basis by using a special
|
|
|
|
|
kernel command line option. Alternatively, you can say Y here to
|
|
|
|
|
turn on synchronous operation by default for all block devices.
|
|
|
|
|
|
|
|
|
|
If you're running a journalling file system (like reiserfs, for
|
|
|
|
|
example) in your virtual machine, you will want to say Y here. If
|
|
|
|
|
you care for the safety of the data in your virtual machine, Y is a
|
|
|
|
|
wise choice too. In all other cases (for example, if you're just
|
|
|
|
|
playing around with User-Mode Linux) you can choose N.
|
|
|
|
|
|
|
|
|
|
config BLK_DEV_COW_COMMON
|
|
|
|
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bool
|
|
|
|
|
default BLK_DEV_UBD
|
|
|
|
|
|
|
|
|
|
config BLK_DEV_LOOP
|
|
|
|
|
tristate "Loopback device support"
|
2020-06-14 00:50:22 +08:00
|
|
|
help
|
2005-04-17 06:20:36 +08:00
|
|
|
Saying Y here will allow you to use a regular file as a block
|
|
|
|
|
device; you can then create a file system on that block device and
|
|
|
|
|
mount it just as you would mount other block devices such as hard
|
|
|
|
|
drive partitions, CD-ROM drives or floppy drives. The loop devices
|
|
|
|
|
are block special device files with major number 7 and typically
|
|
|
|
|
called /dev/loop0, /dev/loop1 etc.
|
|
|
|
|
|
|
|
|
|
This is useful if you want to check an ISO 9660 file system before
|
|
|
|
|
burning the CD, or if you want to use floppy images without first
|
|
|
|
|
writing them to floppy. Furthermore, some Linux distributions avoid
|
|
|
|
|
the need for a dedicated Linux partition by keeping their complete
|
|
|
|
|
root file system inside a DOS FAT file using this loop device
|
|
|
|
|
driver.
|
|
|
|
|
|
|
|
|
|
To use the loop device, you need the losetup utility, found in the
|
|
|
|
|
util-linux package, see
|
2017-03-27 20:44:06 +08:00
|
|
|
<https://www.kernel.org/pub/linux/utils/util-linux/>.
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
|
The loop device driver can also be used to "hide" a file system in
|
|
|
|
|
a disk partition, floppy, or regular file, either using encryption
|
|
|
|
|
(scrambling the data) or steganography (hiding the data in the low
|
|
|
|
|
bits of, say, a sound file). This is also safe if the file resides
|
|
|
|
|
on a remote file server.
|
|
|
|
|
|
|
|
|
|
Note that this loop device has nothing to do with the loopback
|
|
|
|
|
device used for network connections from the machine to itself.
|
|
|
|
|
|
|
|
|
|
To compile this driver as a module, choose M here: the
|
|
|
|
|
module will be called loop.
|
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|
|
|
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|
|
Most users will answer N here.
|
|
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|
|
2011-08-01 04:08:04 +08:00
|
|
|
config BLK_DEV_LOOP_MIN_COUNT
|
|
|
|
|
int "Number of loop devices to pre-create at init time"
|
|
|
|
|
depends on BLK_DEV_LOOP
|
|
|
|
|
default 8
|
|
|
|
|
help
|
|
|
|
|
Static number of loop devices to be unconditionally pre-created
|
|
|
|
|
at init time.
|
|
|
|
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|
|
This default value can be overwritten on the kernel command
|
|
|
|
|
line or with module-parameter loop.max_loop.
|
|
|
|
|
|
|
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|
|
The historic default is 8. If a late 2011 version of losetup(8)
|
|
|
|
|
is used, it can be set to 0, since needed loop devices can be
|
|
|
|
|
dynamically allocated with the /dev/loop-control interface.
|
|
|
|
|
|
2009-09-26 07:07:19 +08:00
|
|
|
source "drivers/block/drbd/Kconfig"
|
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
config BLK_DEV_NBD
|
|
|
|
|
tristate "Network block device support"
|
|
|
|
|
depends on NET
|
2020-06-14 00:50:22 +08:00
|
|
|
help
|
2005-04-17 06:20:36 +08:00
|
|
|
Saying Y here will allow your computer to be a client for network
|
|
|
|
|
block devices, i.e. it will be able to use block devices exported by
|
|
|
|
|
servers (mount file systems on them etc.). Communication between
|
|
|
|
|
client and server works over TCP/IP networking, but to the client
|
|
|
|
|
program this is hidden: it looks like a regular local file access to
|
|
|
|
|
a block device special file such as /dev/nd0.
|
|
|
|
|
|
|
|
|
|
Network block devices also allows you to run a block-device in
|
|
|
|
|
userland (making server and client physically the same computer,
|
|
|
|
|
communicating using the loopback network device).
|
|
|
|
|
|
2019-06-18 22:47:10 +08:00
|
|
|
Read <file:Documentation/admin-guide/blockdev/nbd.rst> for more information,
|
2008-11-14 05:33:24 +08:00
|
|
|
especially about where to find the server code, which runs in user
|
|
|
|
|
space and does not need special kernel support.
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
|
Note that this has nothing to do with the network file systems NFS
|
|
|
|
|
or Coda; you can say N here even if you intend to use NFS or Coda.
|
|
|
|
|
|
|
|
|
|
To compile this driver as a module, choose M here: the
|
|
|
|
|
module will be called nbd.
|
|
|
|
|
|
|
|
|
|
If unsure, say N.
|
|
|
|
|
|
|
|
|
|
config BLK_DEV_SX8
|
|
|
|
|
tristate "Promise SATA SX8 support"
|
|
|
|
|
depends on PCI
|
2020-06-14 00:50:22 +08:00
|
|
|
help
|
2005-04-17 06:20:36 +08:00
|
|
|
Saying Y or M here will enable support for the
|
|
|
|
|
Promise SATA SX8 controllers.
|
|
|
|
|
|
|
|
|
|
Use devices /dev/sx8/$N and /dev/sx8/$Np$M.
|
|
|
|
|
|
|
|
|
|
config BLK_DEV_RAM
|
rewrite rd
This is a rewrite of the ramdisk block device driver.
The old one is really difficult because it effectively implements a block
device which serves data out of its own buffer cache. It relies on the dirty
bit being set, to pin its backing store in cache, however there are non
trivial paths which can clear the dirty bit (eg. try_to_free_buffers()),
which had recently lead to data corruption. And in general it is completely
wrong for a block device driver to do this.
The new one is more like a regular block device driver. It has no idea about
vm/vfs stuff. It's backing store is similar to the buffer cache (a simple
radix-tree of pages), but it doesn't know anything about page cache (the pages
in the radix tree are not pagecache pages).
There is one slight downside -- direct block device access and filesystem
metadata access goes through an extra copy and gets stored in RAM twice.
However, this downside is only slight, because the real buffercache of the
device is now reclaimable (because we're not playing crazy games with it), so
under memory intensive situations, footprint should effectively be the same --
maybe even a slight advantage to the new driver because it can also reclaim
buffer heads.
The fact that it now goes through all the regular vm/fs paths makes it
much more useful for testing, too.
text data bss dec hex filename
2837 849 384 4070 fe6 drivers/block/rd.o
3528 371 12 3911 f47 drivers/block/brd.o
Text is larger, but data and bss are smaller, making total size smaller.
A few other nice things about it:
- Similar structure and layout to the new loop device handlinag.
- Dynamic ramdisk creation.
- Runtime flexible buffer head size (because it is no longer part of the
ramdisk code).
- Boot / load time flexible ramdisk size, which could easily be extended
to a per-ramdisk runtime changeable size (eg. with an ioctl).
- Can use highmem for the backing store.
[akpm@linux-foundation.org: fix build]
[byron.bbradley@gmail.com: make rd_size non-static]
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Byron Bradley <byron.bbradley@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-08 20:19:49 +08:00
|
|
|
tristate "RAM block device support"
|
2020-06-14 00:50:22 +08:00
|
|
|
help
|
2005-04-17 06:20:36 +08:00
|
|
|
Saying Y here will allow you to use a portion of your RAM memory as
|
|
|
|
|
a block device, so that you can make file systems on it, read and
|
|
|
|
|
write to it and do all the other things that you can do with normal
|
|
|
|
|
block devices (such as hard drives). It is usually used to load and
|
|
|
|
|
store a copy of a minimal root file system off of a floppy into RAM
|
|
|
|
|
during the initial install of Linux.
|
|
|
|
|
|
2008-11-14 05:33:24 +08:00
|
|
|
Note that the kernel command line option "ramdisk=XX" is now obsolete.
|
2019-06-18 22:47:10 +08:00
|
|
|
For details, read <file:Documentation/admin-guide/blockdev/ramdisk.rst>.
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
|
To compile this driver as a module, choose M here: the
|
2014-01-24 07:53:46 +08:00
|
|
|
module will be called brd. An alias "rd" has been defined
|
|
|
|
|
for historical reasons.
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
|
Most normal users won't need the RAM disk functionality, and can
|
|
|
|
|
thus say N here.
|
|
|
|
|
|
|
|
|
|
config BLK_DEV_RAM_COUNT
|
2006-03-28 17:56:17 +08:00
|
|
|
int "Default number of RAM disks"
|
2005-04-17 06:20:36 +08:00
|
|
|
default "16"
|
2006-03-28 17:56:17 +08:00
|
|
|
depends on BLK_DEV_RAM
|
2005-04-17 06:20:36 +08:00
|
|
|
help
|
2007-10-20 05:05:02 +08:00
|
|
|
The default value is 16 RAM disks. Change this if you know what you
|
2005-04-17 06:20:36 +08:00
|
|
|
are doing. If you boot from a filesystem that needs to be extracted
|
|
|
|
|
in memory, you will need at least one RAM disk (e.g. root on cramfs).
|
|
|
|
|
|
|
|
|
|
config BLK_DEV_RAM_SIZE
|
|
|
|
|
int "Default RAM disk size (kbytes)"
|
|
|
|
|
depends on BLK_DEV_RAM
|
|
|
|
|
default "4096"
|
|
|
|
|
help
|
|
|
|
|
The default value is 4096 kilobytes. Only change this if you know
|
2007-10-20 05:05:02 +08:00
|
|
|
what you are doing.
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
|
config CDROM_PKTCDVD
|
2016-11-22 00:33:17 +08:00
|
|
|
tristate "Packet writing on CD/DVD media (DEPRECATED)"
|
2005-04-17 06:20:36 +08:00
|
|
|
depends on !UML
|
2021-10-21 14:06:05 +08:00
|
|
|
depends on SCSI
|
2017-10-31 00:02:19 +08:00
|
|
|
select CDROM
|
2005-04-17 06:20:36 +08:00
|
|
|
help
|
2016-11-22 00:33:17 +08:00
|
|
|
Note: This driver is deprecated and will be removed from the
|
|
|
|
|
kernel in the near future!
|
|
|
|
|
|
2006-12-08 18:36:10 +08:00
|
|
|
If you have a CDROM/DVD drive that supports packet writing, say
|
|
|
|
|
Y to include support. It should work with any MMC/Mt Fuji
|
|
|
|
|
compliant ATAPI or SCSI drive, which is just about any newer
|
|
|
|
|
DVD/CD writer.
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2006-12-08 18:36:10 +08:00
|
|
|
Currently only writing to CD-RW, DVD-RW, DVD+RW and DVDRAM discs
|
|
|
|
|
is possible.
|
2005-04-17 06:20:36 +08:00
|
|
|
DVD-RW disks must be in restricted overwrite mode.
|
|
|
|
|
|
2019-06-13 01:52:40 +08:00
|
|
|
See the file <file:Documentation/cdrom/packet-writing.rst>
|
2006-12-08 18:36:10 +08:00
|
|
|
for further information on the use of this driver.
|
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
To compile this driver as a module, choose M here: the
|
|
|
|
|
module will be called pktcdvd.
|
|
|
|
|
|
|
|
|
|
config CDROM_PKTCDVD_BUFFERS
|
|
|
|
|
int "Free buffers for data gathering"
|
|
|
|
|
depends on CDROM_PKTCDVD
|
|
|
|
|
default "8"
|
|
|
|
|
help
|
|
|
|
|
This controls the maximum number of active concurrent packets. More
|
|
|
|
|
concurrent packets can increase write performance, but also require
|
|
|
|
|
more memory. Each concurrent packet will require approximately 64Kb
|
2006-02-05 15:27:47 +08:00
|
|
|
of non-swappable kernel memory, memory which will be allocated when
|
|
|
|
|
a disc is opened for writing.
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
|
config CDROM_PKTCDVD_WCACHE
|
2012-10-24 04:01:51 +08:00
|
|
|
bool "Enable write caching"
|
|
|
|
|
depends on CDROM_PKTCDVD
|
2005-04-17 06:20:36 +08:00
|
|
|
help
|
|
|
|
|
If enabled, write caching will be set for the CD-R/W device. For now
|
|
|
|
|
this option is dangerous unless the CD-RW media is known good, as we
|
|
|
|
|
don't do deferred write error handling yet.
|
|
|
|
|
|
|
|
|
|
config ATA_OVER_ETH
|
|
|
|
|
tristate "ATA over Ethernet support"
|
|
|
|
|
depends on NET
|
|
|
|
|
help
|
|
|
|
|
This driver provides Support for ATA over Ethernet block
|
|
|
|
|
devices like the Coraid EtherDrive (R) Storage Blade.
|
|
|
|
|
|
2007-07-16 19:03:56 +08:00
|
|
|
config SUNVDC
|
|
|
|
|
tristate "Sun Virtual Disk Client support"
|
|
|
|
|
depends on SUN_LDOMS
|
|
|
|
|
help
|
|
|
|
|
Support for virtual disk devices as a client under Sun
|
|
|
|
|
Logical Domains.
|
|
|
|
|
|
2007-05-10 21:46:00 +08:00
|
|
|
source "drivers/s390/block/Kconfig"
|
2007-07-17 19:03:39 +08:00
|
|
|
|
2007-07-18 09:37:06 +08:00
|
|
|
config XEN_BLKDEV_FRONTEND
|
|
|
|
|
tristate "Xen virtual block device support"
|
|
|
|
|
depends on XEN
|
|
|
|
|
default y
|
2009-02-10 04:05:51 +08:00
|
|
|
select XEN_XENBUS_FRONTEND
|
2007-07-18 09:37:06 +08:00
|
|
|
help
|
|
|
|
|
This driver implements the front-end of the Xen virtual
|
|
|
|
|
block device driver. It communicates with a back-end driver
|
|
|
|
|
in another domain which drives the actual block device.
|
|
|
|
|
|
2011-04-19 02:24:23 +08:00
|
|
|
config XEN_BLKDEV_BACKEND
|
2011-08-03 23:12:17 +08:00
|
|
|
tristate "Xen block-device backend driver"
|
2011-04-19 02:24:23 +08:00
|
|
|
depends on XEN_BACKEND
|
|
|
|
|
help
|
|
|
|
|
The block-device backend driver allows the kernel to export its
|
|
|
|
|
block devices to other guests via a high-performance shared-memory
|
|
|
|
|
interface.
|
|
|
|
|
|
2011-05-13 04:10:55 +08:00
|
|
|
The corresponding Linux frontend driver is enabled by the
|
|
|
|
|
CONFIG_XEN_BLKDEV_FRONTEND configuration option.
|
|
|
|
|
|
|
|
|
|
The backend driver attaches itself to a any block device specified
|
|
|
|
|
in the XenBus configuration. There are no limits to what the block
|
|
|
|
|
device as long as it has a major and minor.
|
|
|
|
|
|
|
|
|
|
If you are compiling a kernel to run in a Xen block backend driver
|
|
|
|
|
domain (often this is domain 0) you should say Y here. To
|
|
|
|
|
compile this driver as a module, chose M here: the module
|
|
|
|
|
will be called xen-blkback.
|
|
|
|
|
|
|
|
|
|
|
2007-10-22 09:03:38 +08:00
|
|
|
config VIRTIO_BLK
|
2012-10-24 04:01:51 +08:00
|
|
|
tristate "Virtio block driver"
|
|
|
|
|
depends on VIRTIO
|
2021-09-01 21:14:34 +08:00
|
|
|
select SG_POOL
|
2020-06-14 00:50:22 +08:00
|
|
|
help
|
2007-11-08 10:46:31 +08:00
|
|
|
This is the virtual block driver for virtio. It can be used with
|
2017-08-17 01:31:57 +08:00
|
|
|
QEMU based VMMs (like KVM or Xen). Say Y or M.
|
2007-10-22 09:03:38 +08:00
|
|
|
|
2010-08-13 07:11:25 +08:00
|
|
|
config BLK_DEV_RBD
|
|
|
|
|
tristate "Rados block device (RBD)"
|
2012-10-24 04:01:51 +08:00
|
|
|
depends on INET && BLOCK
|
2010-08-13 07:11:25 +08:00
|
|
|
select CEPH_LIB
|
|
|
|
|
select LIBCRC32C
|
|
|
|
|
select CRYPTO_AES
|
|
|
|
|
select CRYPTO
|
|
|
|
|
help
|
|
|
|
|
Say Y here if you want include the Rados block device, which stripes
|
|
|
|
|
a block device over objects stored in the Ceph distributed object
|
|
|
|
|
store.
|
|
|
|
|
|
|
|
|
|
More information at http://ceph.newdream.net/.
|
|
|
|
|
|
|
|
|
|
If unsure, say N.
|
|
|
|
|
|
2020-05-11 21:51:29 +08:00
|
|
|
source "drivers/block/rnbd/Kconfig"
|
|
|
|
|
|
2007-07-10 18:26:06 +08:00
|
|
|
endif # BLK_DEV
|
