linux-stable.git/drivers/block/Kconfig, branch linux-4.9.y

floppy: disable FDRAWCMD by default

2022-05-12T10:14:53+00:00

commit 233087ca063686964a53c829d547c7571e3f67bf upstream.

Minh Yuan reported a concurrency use-after-free issue in the floppy code
between raw_cmd_ioctl and seek_interrupt.

[ It turns out this has been around, and that others have reported the
  KASAN splats over the years, but Minh Yuan had a reproducer for it and
  so gets primary credit for reporting it for this fix   - Linus ]

The problem is, this driver tends to break very easily and nowadays,
nobody is expected to use FDRAWCMD anyway since it was used to
manipulate non-standard formats.  The risk of breaking the driver is
higher than the risk presented by this race, and accessing the device
requires privileges anyway.

Let's just add a config option to completely disable this ioctl and
leave it disabled by default.  Distros shouldn't use it, and only those
running on antique hardware might need to enable it.

Link: https://lore.kernel.org/all/000000000000b71cdd05d703f6bf@google.com/
Link: https://lore.kernel.org/lkml/CAKcFiNC=MfYVW-Jt9A3=FPJpTwCD2PL_ULNCpsCVE5s8ZeBQgQ@mail.gmail.com
Link: https://lore.kernel.org/all/CAEAjamu1FRhz6StCe_55XY5s389ZP_xmCF69k987En+1z53=eg@mail.gmail.com
Reported-by: Minh Yuan 
Reported-by: syzbot+8e8958586909d62b6840@syzkaller.appspotmail.com
Reported-by: cruise k 
Reported-by: Kyungtae Kim 
Suggested-by: Linus Torvalds 
Tested-by: Denis Efremov 
Signed-off-by: Willy Tarreau 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

cryptoloop: add a deprecation warning

2021-09-22T09:42:55+00:00

[ Upstream commit 222013f9ac30b9cec44301daa8dbd0aae38abffb ]

Support for cryptoloop has been officially marked broken and deprecated
in favor of dm-crypt (which supports the same broken algorithms if
needed) in Linux 2.6.4 (released in March 2004), and support for it has
been entirely removed from losetup in util-linux 2.23 (released in April
2013).  Add a warning and a deprecation schedule.

Signed-off-by: Christoph Hellwig 
Link: https://lore.kernel.org/r/20210827163250.255325-1-hch@lst.de
Signed-off-by: Jens Axboe 
Signed-off-by: Sasha Levin

block: rsxx: select CONFIG_CRC32

2021-01-17T12:57:55+00:00

commit 36a106a4c1c100d55ba3d32a21ef748cfcd4fa99 upstream.

Without crc32, the driver fails to link:

arm-linux-gnueabi-ld: drivers/block/rsxx/config.o: in function `rsxx_load_config':
config.c:(.text+0x124): undefined reference to `crc32_le'

Fixes: 8722ff8cdbfa ("block: IBM RamSan 70/80 device driver")
Signed-off-by: Arnd Bergmann 
Signed-off-by: Jens Axboe 
Signed-off-by: Greg Kroah-Hartman

cpqarray: remove it from the kernel

2016-03-14T15:06:01+00:00

We disabled the ability to enable this driver back in October of 2013,
we should be able to safely remove it at this point. The initial goal
was to remove it in 3.15, so now is the time.

Signed-off-by: Jens Axboe

nvme: move to a new drivers/nvme/host directory

2015-10-09T16:40:37+00:00

This patch moves the NVMe driver from drivers/block/ to its own new
drivers/nvme/host/ directory.  This is in preparation of splitting the
current monolithic driver up and add support for the upcoming NVMe
over Fabrics standard.  The drivers/nvme/host/ is chose to leave space
for a NVMe target implementation in addition to this host side driver.

Signed-off-by: Jay Sternberg 
[hch: rebased, renamed core.c to pci.c, slight tweaks]
Signed-off-by: Christoph Hellwig 
Acked-by: Keith Busch 
Signed-off-by: Jens Axboe

libnvdimm, pmem: move pmem to drivers/nvdimm/

2015-06-25T01:24:10+00:00

Prepare the pmem driver to consume PMEM namespaces emitted by regions of
an nvdimm_bus instance.  No functional change.

Acked-by: Christoph Hellwig 
Tested-by: Toshi Kani 
Signed-off-by: Dan Williams

drivers/block/pmem: Add a driver for persistent memory

2015-04-01T15:03:56+00:00

PMEM is a new driver that presents a reserved range of memory as
a block device.  This is useful for developing with NV-DIMMs,
and can be used with volatile memory as a development platform.

This patch contains the initial driver from Ross Zwisler, with
various changes: converted it to use a platform_device for
discovery, fixed partition support and merged various patches
from Boaz Harrosh.

Tested-by: Ross Zwisler 
Signed-off-by: Ross Zwisler 
Signed-off-by: Christoph Hellwig 
Acked-by: Dan Williams 
Cc: Andrew Morton 
Cc: Andy Lutomirski 
Cc: Boaz Harrosh 
Cc: Borislav Petkov 
Cc: H. Peter Anvin 
Cc: Jens Axboe 
Cc: Jens Axboe 
Cc: Keith Busch 
Cc: Linus Torvalds 
Cc: Matthew Wilcox 
Cc: Thomas Gleixner 
Cc: linux-nvdimm@ml01.01.org
Link: http://lkml.kernel.org/r/1427872339-6688-3-git-send-email-hch@lst.de
[ Minor cleanups. ]
Signed-off-by: Ingo Molnar

brd: rename XIP to DAX

2015-02-17T01:56:04+00:00

Since this is relating to FS_XIP, not KERNEL_XIP, it should be called
DAX instead of XIP.

Signed-off-by: Matthew Wilcox 
Cc: Andreas Dilger 
Cc: Boaz Harrosh 
Cc: Christoph Hellwig 
Cc: Dave Chinner 
Cc: Jan Kara 
Cc: Jens Axboe 
Cc: Kirill A. Shutemov 
Cc: Mathieu Desnoyers 
Cc: Randy Dunlap 
Cc: Ross Zwisler 
Cc: Theodore Ts'o 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

zram: promote zram from staging

2014-01-31T00:56:55+00:00

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 
Reviewed-by: Konrad Rzeszutek Wilk 
Acked-by: Nitin Gupta 
Acked-by: Pekka Enberg 
Cc: Bob Liu 
Cc: Greg Kroah-Hartman 
Cc: Hugh Dickins 
Cc: Jens Axboe 
Cc: Luigi Semenzato 
Cc: Mel Gorman 
Cc: Rik van Riel 
Cc: Seth Jennings 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

drivers/block/Kconfig: update RAM block device module name

2014-01-24T00:36:53+00:00

RAM block device support module name changed to brd.ko some years ago
with an "rd" alias to match previous module implementation.  This patch
updates its Kconfig definition.

Signed-off-by: Fabian Frederick 
Acked-by: Randy Dunlap 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds