Changes in Kconfig

0b7a4817 - ublk: don't suggest CONFIG_BLK_DEV_UBLK=Y

Wed, 16 Apr 2025 00:41:10 +0000

ublk: don't suggest CONFIG_BLK_DEV_UBLK=YThe CONFIG_BLK_DEV_UBLK help text suggests setting the config option toY so task_work_add() can be used to dispatch I/O, improving performance.However, this mechanism was removed in commit 29dc5d06613f2 ("ublk: killqueuing request by task_work_add"). So remove this paragraph from theconfig help text.Signed-off-by: Caleb Sander Mateos Reviewed-by: Uday Shankar Link: https://lore.kernel.org/r/20250416004111.3242817-1-csander@purestorage.comSigned-off-by: Jens Axboe List of files: /linux-6.15/drivers/block/Kconfig

b261d222 - lib/crc: remove CONFIG_LIBCRC32C

Tue, 01 Apr 2025 22:16:00 +0000

lib/crc: remove CONFIG_LIBCRC32CNow that LIBCRC32C does nothing besides select CRC32, make every optionthat selects LIBCRC32C instead select CRC32 directly. Then removeLIBCRC32C.Reviewed-by: Christoph Hellwig Reviewed-by: "Martin K. Petersen" Acked-by: Ard Biesheuvel Link: https://lore.kernel.org/r/20250401221600.24878-8-ebiggers@kernel.orgSigned-off-by: Eric Biggers List of files: /linux-6.15/drivers/block/Kconfig

fb6f20ec - reiserfs: The last commit

Thu, 17 Oct 2024 10:28:23 +0000

reiserfs: The last commitDeprecation period of reiserfs ends with the end of this year so it istime to remove it from the kernel.Acked-by: Darrick J. Wong Acked-by: Christian Brauner Signed-off-by: Jan Kara List of files: /linux-6.15/drivers/block/Kconfig

bc5b533b - rust: block: add rnull, Rust null_blk implementation

Tue, 11 Jun 2024 11:45:50 +0000

rust: block: add rnull, Rust null_blk implementationThis patch adds an initial version of the Rust null block driver.Signed-off-by: Andreas Hindborg Reviewed-by: Benno Lossin Link: https://lore.kernel.org/r/20240611114551.228679-3-nmi@metaspace.dkSigned-off-by: Jens Axboe List of files: /linux-6.15/drivers/block/Kconfig

2d786e66 - block: ublk: switch to ioctl command encoding

Tue, 18 Apr 2023 13:18:10 +0000

block: ublk: switch to ioctl command encodingAll ublk commands(control, IO) should have taken ioctl command encodingfrom the beginning, because ioctl command encoding defines each codeuniquely, so driver can figure out wrong command sent from userspaceeasily; 2) it might help security subsystem for audit uring cmd[1].Unfortunately we didn't do that way, and it could be one lesson forublk driver.So switch to ioctl command encoding now, we still support commands encodedin old way, but they become legacy definition. Any new command should takeioctl encoding.See ublksrv code for switching to ioctl command encoding in [2].[1] https://lore.kernel.org/io-uring/CAHC9VhSVzujW9LOj5Km80AjU0EfAuukoLrxO6BEfnXeK_s6bAg@mail.gmail.com/[2] https://github.com/ming1/ubdsrv/commits/ioctl_cmd_encodingCc: Christoph Hellwig Cc: Ken Kurematsu Signed-off-by: Ming Lei Reviewed-by: Christoph Hellwig Link: https://lore.kernel.org/r/20230418131810.855959-1-ming.lei@redhat.comSigned-off-by: Jens Axboe List of files: /linux-6.15/drivers/block/Kconfig

72f2b0b2 - drivers/block: Move PARIDE protocol modules to drivers/ata/pata_parport

Mon, 30 Jan 2023 21:10:50 +0000

drivers/block: Move PARIDE protocol modules to drivers/ata/pata_parportMove PARIDE protocol modules out of drivers/block intodrivers/ata/pata_parport and update the CONFIG_ symbol names toPATA_PARPORT.[Damien]The pata_parport driver file itsef is also moved together with theprotocol modules in drivers/ata/pata_parport.Signed-off-by: Ondrej Zary Acked-by: Jens Axboe Signed-off-by: Damien Le Moal List of files: /linux-6.15/drivers/block/Kconfig

7750d8b5 - drivers/block: Remove PARIDE core and high-level protocols

Mon, 30 Jan 2023 21:10:49 +0000

drivers/block: Remove PARIDE core and high-level protocolsRemove PARIDE core and high level protocols, taking care not to breaklow-level drivers (used by pata_parport). Also update documentation.Signed-off-by: Ondrej Zary Acked-by: Jens Axboe Signed-off-by: Damien Le Moal List of files: /linux-6.15/drivers/block/Kconfig

4b83e99e - Revert "pktcdvd: remove driver."

Wed, 04 Jan 2023 21:44:13 +0000

Revert "pktcdvd: remove driver."This reverts commit f40eb99897af665f11858dd7b56edcb62c3f3c67.There are apparently still users out there of this driver. While we'dlove to remove it to ease the maintenance burden, let's reinstate itfor now until better (userspace) solutions can be developed.Link: https://lore.kernel.org/lkml/20230104190115.ceglfefco475ev6c@pali/Reported-by: Pali Rohár Signed-off-by: Jens Axboe List of files: /linux-6.15/drivers/block/Kconfig

f40eb998 - pktcdvd: remove driver.

Fri, 02 Dec 2022 18:27:58 +0000

pktcdvd: remove driver.Way back in 2016 in commit 5a8b187c61e9 ("pktcdvd: mark as unmaintainedand deprecated") this driver was marked as "will be removed soon". 5years seems long enough to have it stick around after that, so finallyremove the thing now.Reported-by: Christoph Hellwig Cc: Jens Axboe Cc: Thomas Maier Cc: Peter Osterlund Cc: linux-block@vger.kernel.orgSigned-off-by: Greg Kroah-Hartman Link: https://lore.kernel.org/r/20221202182758.1339039-1-gregkh@linuxfoundation.orgSigned-off-by: Jens Axboe List of files: /linux-6.15/drivers/block/Kconfig

d57c2c6c - ublk_drv: comment on ublk_driver entry of Kconfig

Sat, 29 Oct 2022 01:04:30 +0000

ublk_drv: comment on ublk_driver entry of KconfigAdd help info for choosing to build ublk_drv as module or builtin.Signed-off-by: Ming Lei Reviewed-by: ZiyangZhang Link: https://lore.kernel.org/r/20221029010432.598367-3-ming.lei@redhat.comSigned-off-by: Jens Axboe List of files: /linux-6.15/drivers/block/Kconfig

d13bc4d8 - remove the sx8 block driver

Thu, 21 Jul 2022 06:41:02 +0000

remove the sx8 block driverThis driver is for fairly obscure hardware, and has only seen randomdrive-by changes after the maintainer stopped working on it in 2005(about a year and a half after it was introduced). It has some"interesting" block layer interactions, so let's just drop it unlessanyone complains.Signed-off-by: Christoph Hellwig Link: https://lore.kernel.org/r/20220721064102.1715460-1-hch@lst.de[axboe: fix date typo, it was in 2005, not 2015]Signed-off-by: Jens Axboe List of files: /linux-6.15/drivers/block/Kconfig

71f28f31 - ublk_drv: add io_uring based userspace block driver

Wed, 13 Jul 2022 14:07:10 +0000

ublk_drv: add io_uring based userspace block driverThis is the driver part of userspace block driver(ublk driver), the otherpart is userspace daemon part(ublksrv)[1].The two parts communicate by io_uring's IORING_OP_URING_CMD with oneshared cmd buffer for storing io command, and the buffer is read only forublksrv, each io command is indexed by io request tag directly, and iswritten by ublk driver.For example, when one READ io request is submitted to ublk block driver,ublk driver stores the io command into cmd buffer first, then completesone IORING_OP_URING_CMD for notifying ublksrv, and the URING_CMD is issuedto ublk driver beforehand by ublksrv for getting notification of any newio request, and each URING_CMD is associated with one io request by tag.After ublksrv gets the io command, it translates and handles the ublk iorequest, such as, for the ublk-loop target, ublksrv translates the requestinto same request on another file or disk, like the kernel loop blockdriver. In ublksrv's implementation, the io is still handled by io_uring,and share same ring with IORING_OP_URING_CMD command. When the target iorequest is done, the same IORING_OP_URING_CMD is issued to ublk driver forboth committing io request result and getting future notification of newio request.Another thing done by ublk driver is to copy data between kernel iorequest and ublksrv's io buffer:1) before ubsrv handles WRITE request, copy the request's data into ublksrv's userspace io buffer, so that ublksrv can handle the write request2) after ubsrv handles READ request, copy ublksrv's userspace io buffer into this READ request, then ublk driver can complete the READ requestZero copy may be switched if mm is ready to support it.ublk driver doesn't handle any logic of the specific user space driver,so it is small/simple enough.[1] ublksrvhttps://github.com/ming1/ubdsrvSigned-off-by: Ming Lei Link: https://lore.kernel.org/r/20220713140711.97356-2-ming.lei@redhat.comSigned-off-by: Jens Axboe List of files: /linux-6.15/drivers/block/Kconfig

233087ca - floppy: disable FDRAWCMD by default

Tue, 26 Apr 2022 20:41:05 +0000

floppy: disable FDRAWCMD by defaultMinh Yuan reported a concurrency use-after-free issue in the floppy codebetween 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 tomanipulate non-standard formats. The risk of breaking the driver ishigher than the risk presented by this race, and accessing the devicerequires privileges anyway.Let's just add a config option to completely disable this ioctl andleave it disabled by default. Distros shouldn't use it, and only thoserunning 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.comLink: https://lore.kernel.org/all/CAEAjamu1FRhz6StCe_55XY5s389ZP_xmCF69k987En+1z53=eg@mail.gmail.comReported-by: Minh Yuan Reported-by: syzbot+8e8958586909d62b6840@syzkaller.appspotmail.comReported-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 List of files: /linux-6.15/drivers/block/Kconfig

3427f2b2 - block: remove the rsxx driver

Thu, 16 Dec 2021 08:42:44 +0000

block: remove the rsxx driverThis driver was for rare and shortlived high end enterprise hardwareand hasn't been maintained since 2014, which also means it never gotconverted to use blk-mq.Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe List of files: /linux-6.15/drivers/block/Kconfig

02746e26 - virtio-blk: avoid preallocating big SGL for data

Wed, 01 Sep 2021 13:14:34 +0000

virtio-blk: avoid preallocating big SGL for dataNo need to pre-allocate a big buffer for the IO SGL anymore. If a devicehas lots of deep queues, preallocation for the sg list can consumesubstantial amounts of memory. For HW virtio-blk device, nr_hw_queuescan be 64 or 128 and each queue's depth might be 128. This means theresulting preallocation for the data SGLs is big.Switch to runtime allocation for SGL for lists longer than 2 entries.This is the approach used by NVMe drivers so it should be reasonable forvirtio block as well. Runtime SGL allocation has always been the casefor the legacy I/O path so this is nothing new.The preallocated small SGL depends on SG_CHAIN so if the ARCH doesn'tsupport SG_CHAIN, use only runtime allocation for the SGL.Re-organize the setup of the IO request to fit the new sg chainmechanism.No performance degradation was seen (fio libaio engine with 16 jobs and128 iodepth):IO size IOPs Rand Read (before/after) IOPs Rand Write (before/after)-------- --------------------------------- ----------------------------------512B 318K/316K 329K/325K4KB 323K/321K 353K/349K16KB 199K/208K 250K/275K128KB 36K/36.1K 39.2K/41.7KSigned-off-by: Max Gurtovoy Reviewed-by: Israel Rukshin Link: https://lore.kernel.org/r/20210901131434.31158-1-mgurtovoy@nvidia.comReviewed-by: Feng Li Reviewed-by: Stefan Hajnoczi Tested-by: Stefan Hajnoczi Reviewed-by: Christoph Hellwig Signed-off-by: Arnd Bergmann # kconfig fixupsSigned-off-by: Michael S. Tsirkin List of files: /linux-6.15/drivers/block/Kconfig

47e96246 - block: remove support for cryptoloop and the xor transfer

Tue, 19 Oct 2021 07:56:39 +0000

block: remove support for cryptoloop and the xor transferSupport for cyrptoloop has been officially marked broken and deprecatedin favor of dm-crypt (which supports the same broken algorithms ifneeded) in Linux 2.6.4 (released in March 2004), and support for it hasbeen entirely removed from losetup in util-linux 2.23 (released in April2013). The XOR transfer has never been more than a toy to demonstratethe transfer in the bad old times of crypto export restrictions.Remove them as they have some nasty interactions with loop device lifetimes due to the iteration over all loop devices inloop_unregister_transfer.Suggested-by: Milan Broz Signed-off-by: Christoph Hellwig Link: https://lore.kernel.org/r/20211019075639.2333969-1-hch@lst.deSigned-off-by: Jens Axboe List of files: /linux-6.15/drivers/block/Kconfig

68ec3b81 - scsi: add a scsi_alloc_request helper

Thu, 21 Oct 2021 06:06:05 +0000

scsi: add a scsi_alloc_request helperAdd a new helper that calls blk_get_request and initializes thescsi_request to avoid the indirect call through ->.initialize_rq_fn.Note that this makes the pktcdvd driver depend on the SCSI core, butgiven that only SCSI devices support SCSI passthrough requests thatis not a functional change.Signed-off-by: Christoph Hellwig Reviewed-by: Hannes Reinecke Link: https://lore.kernel.org/r/20211021060607.264371-6-hch@lst.deSigned-off-by: Jens Axboe List of files: /linux-6.15/drivers/block/Kconfig

222013f9 - cryptoloop: add a deprecation warning

Fri, 27 Aug 2021 16:32:50 +0000

cryptoloop: add a deprecation warningSupport for cryptoloop has been officially marked broken and deprecatedin favor of dm-crypt (which supports the same broken algorithms ifneeded) in Linux 2.6.4 (released in March 2004), and support for it hasbeen entirely removed from losetup in util-linux 2.23 (released in April2013). Add a warning and a deprecation schedule.Signed-off-by: Christoph Hellwig Link: https://lore.kernel.org/r/20210827163250.255325-1-hch@lst.deSigned-off-by: Jens Axboe List of files: /linux-6.15/drivers/block/Kconfig

33ff4ce4 - scsi: core: Rename CONFIG_BLK_SCSI_REQUEST to CONFIG_SCSI_COMMON

Sat, 24 Jul 2021 07:20:28 +0000

scsi: core: Rename CONFIG_BLK_SCSI_REQUEST to CONFIG_SCSI_COMMONCONFIG_BLK_SCSI_REQUEST is rather misnamed as it enables building a smallamount of code shared by the SCSI initiator, target, and consumers of thescsi_request passthrough API. Rename it and also allow building it as amodule.[mkp: add module license]Link: https://lore.kernel.org/r/20210724072033.1284840-20-hch@lst.deSigned-off-by: Christoph Hellwig Signed-off-by: Martin K. Petersen List of files: /linux-6.15/drivers/block/Kconfig

e9ee7fea - scsi: cdrom: Remove the call to scsi_cmd_blk_ioctl() from cdrom_ioctl()

Sat, 24 Jul 2021 07:20:17 +0000

scsi: cdrom: Remove the call to scsi_cmd_blk_ioctl() from cdrom_ioctl()Only the sr driver can handle SCSI passthrough requests, so move the callto scsi_cmd_blk_ioctl() there.Link: https://lore.kernel.org/r/20210724072033.1284840-9-hch@lst.deSigned-off-by: Christoph Hellwig Signed-off-by: Martin K. Petersen List of files: /linux-6.15/drivers/block/Kconfig