1b2441318SGreg Kroah-Hartman# SPDX-License-Identifier: GPL-2.0 21da177e4SLinus Torvalds# 31da177e4SLinus Torvalds# Block device driver configuration 41da177e4SLinus Torvalds# 51da177e4SLinus Torvalds 6fd11d171SJan Engelhardtmenuconfig BLK_DEV 7fd11d171SJan Engelhardt bool "Block devices" 8fd11d171SJan Engelhardt depends on BLOCK 9fd11d171SJan Engelhardt default y 10a7f7f624SMasahiro Yamada help 1106bfb7ebSJan Engelhardt Say Y here to get to see options for various different block device 1206bfb7ebSJan Engelhardt drivers. This option alone does not add any kernel code. 1306bfb7ebSJan Engelhardt 1406bfb7ebSJan Engelhardt If you say N, all options in this submenu will be skipped and disabled; 1506bfb7ebSJan Engelhardt only do this if you know what you are doing. 169361401eSDavid Howells 17fd11d171SJan Engelhardtif BLK_DEV 181da177e4SLinus Torvalds 19eebf34a8SDamien Le Moalsource "drivers/block/null_blk/Kconfig" 20f2298c04SJens Axboe 211da177e4SLinus Torvaldsconfig BLK_DEV_FD 221da177e4SLinus Torvalds tristate "Normal floppy disk support" 23a08b6b79Sviro@ZenIV.linux.org.uk depends on ARCH_MAY_HAVE_PC_FDC 24a7f7f624SMasahiro Yamada help 251da177e4SLinus Torvalds If you want to use the floppy disk drive(s) of your PC under Linux, 261da177e4SLinus Torvalds say Y. Information about this driver, especially important for IBM 2731c00fc1SRandy Dunlap Thinkpad users, is contained in 28e7751617SMauro Carvalho Chehab <file:Documentation/admin-guide/blockdev/floppy.rst>. 291da177e4SLinus Torvalds That file also contains the location of the Floppy driver FAQ as 301da177e4SLinus Torvalds well as location of the fdutils package used to configure additional 311da177e4SLinus Torvalds parameters of the driver at run time. 321da177e4SLinus Torvalds 331da177e4SLinus Torvalds To compile this driver as a module, choose M here: the 341da177e4SLinus Torvalds module will be called floppy. 351da177e4SLinus Torvalds 36233087caSWilly Tarreauconfig BLK_DEV_FD_RAWCMD 37233087caSWilly Tarreau bool "Support for raw floppy disk commands (DEPRECATED)" 38233087caSWilly Tarreau depends on BLK_DEV_FD 39233087caSWilly Tarreau help 40233087caSWilly Tarreau If you want to use actual physical floppies and expect to do 41233087caSWilly Tarreau special low-level hardware accesses to them (access and use 42233087caSWilly Tarreau non-standard formats, for example), then enable this. 43233087caSWilly Tarreau 44233087caSWilly Tarreau Note that the code enabled by this option is rarely used and 45233087caSWilly Tarreau might be unstable or insecure, and distros should not enable it. 46233087caSWilly Tarreau 47233087caSWilly Tarreau Note: FDRAWCMD is deprecated and will be removed from the kernel 48233087caSWilly Tarreau in the near future. 49233087caSWilly Tarreau 50233087caSWilly Tarreau If unsure, say N. 51233087caSWilly Tarreau 521da177e4SLinus Torvaldsconfig AMIGA_FLOPPY 531da177e4SLinus Torvalds tristate "Amiga floppy support" 541da177e4SLinus Torvalds depends on AMIGA 551da177e4SLinus Torvalds 561da177e4SLinus Torvaldsconfig ATARI_FLOPPY 571da177e4SLinus Torvalds tristate "Atari floppy support" 581da177e4SLinus Torvalds depends on ATARI 591da177e4SLinus Torvalds 601da177e4SLinus Torvaldsconfig MAC_FLOPPY 611da177e4SLinus Torvalds tristate "Support for PowerMac floppy" 621da177e4SLinus Torvalds depends on PPC_PMAC && !PPC_PMAC64 631da177e4SLinus Torvalds help 641da177e4SLinus Torvalds If you have a SWIM-3 (Super Woz Integrated Machine 3; from Apple) 651da177e4SLinus Torvalds floppy controller, say Y here. Most commonly found in PowerMacs. 661da177e4SLinus Torvalds 678852ecd9SLaurent Vivierconfig BLK_DEV_SWIM 688852ecd9SLaurent Vivier tristate "Support for SWIM Macintosh floppy" 694c6e5bc8SChristoph Hellwig depends on M68K && MAC && !HIGHMEM 708852ecd9SLaurent Vivier help 718852ecd9SLaurent Vivier You should select this option if you want floppy support 728852ecd9SLaurent Vivier and you don't have a II, IIfx, Q900, Q950 or AV series. 738852ecd9SLaurent Vivier 741da177e4SLinus Torvaldsconfig AMIGA_Z2RAM 751da177e4SLinus Torvalds tristate "Amiga Zorro II ramdisk support" 761da177e4SLinus Torvalds depends on ZORRO 771da177e4SLinus Torvalds help 781da177e4SLinus Torvalds This enables support for using Chip RAM and Zorro II RAM as a 791da177e4SLinus Torvalds ramdisk or as a swap partition. Say Y if you want to include this 801da177e4SLinus Torvalds driver in the kernel. 811da177e4SLinus Torvalds 821da177e4SLinus Torvalds To compile this driver as a module, choose M here: the 831da177e4SLinus Torvalds module will be called z2ram. 841da177e4SLinus Torvalds 85d9b2a2bbSLauri Kasanenconfig N64CART 86d9b2a2bbSLauri Kasanen bool "N64 cart support" 87d9b2a2bbSLauri Kasanen depends on MACH_NINTENDO64 88d9b2a2bbSLauri Kasanen help 89d9b2a2bbSLauri Kasanen Support for the N64 cart. 90d9b2a2bbSLauri Kasanen 912a750166SBart Van Asscheconfig CDROM 92a116895fSJens Axboe tristate 932a750166SBart Van Assche 942395e463SRandy Dunlapconfig GDROM 952395e463SRandy Dunlap tristate "SEGA Dreamcast GD-ROM drive" 962395e463SRandy Dunlap depends on SH_DREAMCAST 972a750166SBart Van Assche select CDROM 982395e463SRandy Dunlap help 992395e463SRandy Dunlap A standard SEGA Dreamcast comes with a modified CD ROM drive called a 1002395e463SRandy Dunlap "GD-ROM" by SEGA to signify it is capable of reading special disks 1012395e463SRandy Dunlap with up to 1 GB of data. This drive will also read standard CD ROM 1022395e463SRandy Dunlap disks. Select this option to access any disks in your GD ROM drive. 1032395e463SRandy Dunlap Most users will want to say "Y" here. 1042395e463SRandy Dunlap You can also build this as a module which will be called gdrom. 1052395e463SRandy Dunlap 10688523a61SSam Bradshawsource "drivers/block/mtip32xx/Kconfig" 10788523a61SSam Bradshaw 108cd67e10aSMinchan Kimsource "drivers/block/zram/Kconfig" 109cd67e10aSMinchan Kim 1101da177e4SLinus Torvaldsconfig BLK_DEV_UBD 1111da177e4SLinus Torvalds bool "Virtual block device" 1121da177e4SLinus Torvalds depends on UML 113a7f7f624SMasahiro Yamada help 1141da177e4SLinus Torvalds The User-Mode Linux port includes a driver called UBD which will let 1151da177e4SLinus Torvalds you access arbitrary files on the host computer as block devices. 1161da177e4SLinus Torvalds Unless you know that you do not need such virtual block devices say 1171da177e4SLinus Torvalds Y here. 1181da177e4SLinus Torvalds 1191da177e4SLinus Torvaldsconfig BLK_DEV_UBD_SYNC 1201da177e4SLinus Torvalds bool "Always do synchronous disk IO for UBD" 1211da177e4SLinus Torvalds depends on BLK_DEV_UBD 122a7f7f624SMasahiro Yamada help 1231da177e4SLinus Torvalds Writes to the virtual block device are not immediately written to the 1241da177e4SLinus Torvalds host's disk; this may cause problems if, for example, the User-Mode 1251da177e4SLinus Torvalds Linux 'Virtual Machine' uses a journalling filesystem and the host 1261da177e4SLinus Torvalds computer crashes. 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds Synchronous operation (i.e. always writing data to the host's disk 1291da177e4SLinus Torvalds immediately) is configurable on a per-UBD basis by using a special 1301da177e4SLinus Torvalds kernel command line option. Alternatively, you can say Y here to 1311da177e4SLinus Torvalds turn on synchronous operation by default for all block devices. 1321da177e4SLinus Torvalds 133*fb6f20ecSJan Kara If you're running a journalling file system (like xfs, for 1341da177e4SLinus Torvalds example) in your virtual machine, you will want to say Y here. If 1351da177e4SLinus Torvalds you care for the safety of the data in your virtual machine, Y is a 1361da177e4SLinus Torvalds wise choice too. In all other cases (for example, if you're just 1371da177e4SLinus Torvalds playing around with User-Mode Linux) you can choose N. 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvaldsconfig BLK_DEV_COW_COMMON 1401da177e4SLinus Torvalds bool 1411da177e4SLinus Torvalds default BLK_DEV_UBD 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvaldsconfig BLK_DEV_LOOP 1441da177e4SLinus Torvalds tristate "Loopback device support" 145a7f7f624SMasahiro Yamada help 1461da177e4SLinus Torvalds Saying Y here will allow you to use a regular file as a block 1471da177e4SLinus Torvalds device; you can then create a file system on that block device and 1481da177e4SLinus Torvalds mount it just as you would mount other block devices such as hard 1491da177e4SLinus Torvalds drive partitions, CD-ROM drives or floppy drives. The loop devices 1501da177e4SLinus Torvalds are block special device files with major number 7 and typically 1511da177e4SLinus Torvalds called /dev/loop0, /dev/loop1 etc. 1521da177e4SLinus Torvalds 1531da177e4SLinus Torvalds This is useful if you want to check an ISO 9660 file system before 1541da177e4SLinus Torvalds burning the CD, or if you want to use floppy images without first 1551da177e4SLinus Torvalds writing them to floppy. Furthermore, some Linux distributions avoid 1561da177e4SLinus Torvalds the need for a dedicated Linux partition by keeping their complete 1571da177e4SLinus Torvalds root file system inside a DOS FAT file using this loop device 1581da177e4SLinus Torvalds driver. 1591da177e4SLinus Torvalds 1601da177e4SLinus Torvalds To use the loop device, you need the losetup utility, found in the 1611da177e4SLinus Torvalds util-linux package, see 1624f6cce39SSeongJae Park <https://www.kernel.org/pub/linux/utils/util-linux/>. 1631da177e4SLinus Torvalds 1641da177e4SLinus Torvalds The loop device driver can also be used to "hide" a file system in 1651da177e4SLinus Torvalds a disk partition, floppy, or regular file, either using encryption 1661da177e4SLinus Torvalds (scrambling the data) or steganography (hiding the data in the low 1671da177e4SLinus Torvalds bits of, say, a sound file). This is also safe if the file resides 1681da177e4SLinus Torvalds on a remote file server. 1691da177e4SLinus Torvalds 1701da177e4SLinus Torvalds Note that this loop device has nothing to do with the loopback 1711da177e4SLinus Torvalds device used for network connections from the machine to itself. 1721da177e4SLinus Torvalds 1731da177e4SLinus Torvalds To compile this driver as a module, choose M here: the 1741da177e4SLinus Torvalds module will be called loop. 1751da177e4SLinus Torvalds 1761da177e4SLinus Torvalds Most users will answer N here. 1771da177e4SLinus Torvalds 178d134b00bSKay Sieversconfig BLK_DEV_LOOP_MIN_COUNT 179d134b00bSKay Sievers int "Number of loop devices to pre-create at init time" 180d134b00bSKay Sievers depends on BLK_DEV_LOOP 181d134b00bSKay Sievers default 8 182d134b00bSKay Sievers help 183d134b00bSKay Sievers Static number of loop devices to be unconditionally pre-created 184d134b00bSKay Sievers at init time. 185d134b00bSKay Sievers 186d134b00bSKay Sievers This default value can be overwritten on the kernel command 187d134b00bSKay Sievers line or with module-parameter loop.max_loop. 188d134b00bSKay Sievers 189d134b00bSKay Sievers The historic default is 8. If a late 2011 version of losetup(8) 190d134b00bSKay Sievers is used, it can be set to 0, since needed loop devices can be 191d134b00bSKay Sievers dynamically allocated with the /dev/loop-control interface. 192d134b00bSKay Sievers 193b411b363SPhilipp Reisnersource "drivers/block/drbd/Kconfig" 194b411b363SPhilipp Reisner 1951da177e4SLinus Torvaldsconfig BLK_DEV_NBD 1961da177e4SLinus Torvalds tristate "Network block device support" 1971da177e4SLinus Torvalds depends on NET 198a7f7f624SMasahiro Yamada help 1991da177e4SLinus Torvalds Saying Y here will allow your computer to be a client for network 2001da177e4SLinus Torvalds block devices, i.e. it will be able to use block devices exported by 2011da177e4SLinus Torvalds servers (mount file systems on them etc.). Communication between 2021da177e4SLinus Torvalds client and server works over TCP/IP networking, but to the client 2031da177e4SLinus Torvalds program this is hidden: it looks like a regular local file access to 2041da177e4SLinus Torvalds a block device special file such as /dev/nd0. 2051da177e4SLinus Torvalds 2061da177e4SLinus Torvalds Network block devices also allows you to run a block-device in 2071da177e4SLinus Torvalds userland (making server and client physically the same computer, 2081da177e4SLinus Torvalds communicating using the loopback network device). 2091da177e4SLinus Torvalds 210e7751617SMauro Carvalho Chehab Read <file:Documentation/admin-guide/blockdev/nbd.rst> for more information, 21131c00fc1SRandy Dunlap especially about where to find the server code, which runs in user 21231c00fc1SRandy Dunlap space and does not need special kernel support. 2131da177e4SLinus Torvalds 2141da177e4SLinus Torvalds Note that this has nothing to do with the network file systems NFS 2151da177e4SLinus Torvalds or Coda; you can say N here even if you intend to use NFS or Coda. 2161da177e4SLinus Torvalds 2171da177e4SLinus Torvalds To compile this driver as a module, choose M here: the 2181da177e4SLinus Torvalds module will be called nbd. 2191da177e4SLinus Torvalds 2201da177e4SLinus Torvalds If unsure, say N. 2211da177e4SLinus Torvalds 2221da177e4SLinus Torvaldsconfig BLK_DEV_RAM 2239db5579bSNick Piggin tristate "RAM block device support" 224a7f7f624SMasahiro Yamada help 2251da177e4SLinus Torvalds Saying Y here will allow you to use a portion of your RAM memory as 2261da177e4SLinus Torvalds a block device, so that you can make file systems on it, read and 2271da177e4SLinus Torvalds write to it and do all the other things that you can do with normal 2281da177e4SLinus Torvalds block devices (such as hard drives). It is usually used to load and 2291da177e4SLinus Torvalds store a copy of a minimal root file system off of a floppy into RAM 2301da177e4SLinus Torvalds during the initial install of Linux. 2311da177e4SLinus Torvalds 23231c00fc1SRandy Dunlap Note that the kernel command line option "ramdisk=XX" is now obsolete. 233e7751617SMauro Carvalho Chehab For details, read <file:Documentation/admin-guide/blockdev/ramdisk.rst>. 2341da177e4SLinus Torvalds 2351da177e4SLinus Torvalds To compile this driver as a module, choose M here: the 236a3b25d9bSFabian Frederick module will be called brd. An alias "rd" has been defined 237a3b25d9bSFabian Frederick for historical reasons. 2381da177e4SLinus Torvalds 2391da177e4SLinus Torvalds Most normal users won't need the RAM disk functionality, and can 2401da177e4SLinus Torvalds thus say N here. 2411da177e4SLinus Torvalds 2421da177e4SLinus Torvaldsconfig BLK_DEV_RAM_COUNT 243a687fb18SAdrian Bunk int "Default number of RAM disks" 2441da177e4SLinus Torvalds default "16" 245a687fb18SAdrian Bunk depends on BLK_DEV_RAM 2461da177e4SLinus Torvalds help 2472e977c85SPatrick Ringl The default value is 16 RAM disks. Change this if you know what you 2481da177e4SLinus Torvalds are doing. If you boot from a filesystem that needs to be extracted 2491da177e4SLinus Torvalds in memory, you will need at least one RAM disk (e.g. root on cramfs). 2501da177e4SLinus Torvalds 2511da177e4SLinus Torvaldsconfig BLK_DEV_RAM_SIZE 2521da177e4SLinus Torvalds int "Default RAM disk size (kbytes)" 2531da177e4SLinus Torvalds depends on BLK_DEV_RAM 2541da177e4SLinus Torvalds default "4096" 2551da177e4SLinus Torvalds help 2561da177e4SLinus Torvalds The default value is 4096 kilobytes. Only change this if you know 2572e977c85SPatrick Ringl what you are doing. 2581da177e4SLinus Torvalds 2594b83e99eSJens Axboeconfig CDROM_PKTCDVD 2604b83e99eSJens Axboe tristate "Packet writing on CD/DVD media (DEPRECATED)" 2614b83e99eSJens Axboe depends on !UML 2624b83e99eSJens Axboe depends on SCSI 2634b83e99eSJens Axboe select CDROM 2644b83e99eSJens Axboe help 2654b83e99eSJens Axboe Note: This driver is deprecated and will be removed from the 2664b83e99eSJens Axboe kernel in the near future! 2674b83e99eSJens Axboe 2684b83e99eSJens Axboe If you have a CDROM/DVD drive that supports packet writing, say 2694b83e99eSJens Axboe Y to include support. It should work with any MMC/Mt Fuji 2704b83e99eSJens Axboe compliant ATAPI or SCSI drive, which is just about any newer 2714b83e99eSJens Axboe DVD/CD writer. 2724b83e99eSJens Axboe 2734b83e99eSJens Axboe Currently only writing to CD-RW, DVD-RW, DVD+RW and DVDRAM discs 2744b83e99eSJens Axboe is possible. 2754b83e99eSJens Axboe DVD-RW disks must be in restricted overwrite mode. 2764b83e99eSJens Axboe 2774b83e99eSJens Axboe See the file <file:Documentation/cdrom/packet-writing.rst> 2784b83e99eSJens Axboe for further information on the use of this driver. 2794b83e99eSJens Axboe 2804b83e99eSJens Axboe To compile this driver as a module, choose M here: the 2814b83e99eSJens Axboe module will be called pktcdvd. 2824b83e99eSJens Axboe 2834b83e99eSJens Axboeconfig CDROM_PKTCDVD_BUFFERS 2844b83e99eSJens Axboe int "Free buffers for data gathering" 2854b83e99eSJens Axboe depends on CDROM_PKTCDVD 2864b83e99eSJens Axboe default "8" 2874b83e99eSJens Axboe help 2884b83e99eSJens Axboe This controls the maximum number of active concurrent packets. More 2894b83e99eSJens Axboe concurrent packets can increase write performance, but also require 2904b83e99eSJens Axboe more memory. Each concurrent packet will require approximately 64Kb 2914b83e99eSJens Axboe of non-swappable kernel memory, memory which will be allocated when 2924b83e99eSJens Axboe a disc is opened for writing. 2934b83e99eSJens Axboe 2944b83e99eSJens Axboeconfig CDROM_PKTCDVD_WCACHE 2954b83e99eSJens Axboe bool "Enable write caching" 2964b83e99eSJens Axboe depends on CDROM_PKTCDVD 2974b83e99eSJens Axboe help 2984b83e99eSJens Axboe If enabled, write caching will be set for the CD-R/W device. For now 2994b83e99eSJens Axboe this option is dangerous unless the CD-RW media is known good, as we 3004b83e99eSJens Axboe don't do deferred write error handling yet. 3014b83e99eSJens Axboe 3021da177e4SLinus Torvaldsconfig ATA_OVER_ETH 3031da177e4SLinus Torvalds tristate "ATA over Ethernet support" 3041da177e4SLinus Torvalds depends on NET 3051da177e4SLinus Torvalds help 3061da177e4SLinus Torvalds This driver provides Support for ATA over Ethernet block 3071da177e4SLinus Torvalds devices like the Coraid EtherDrive (R) Storage Blade. 3081da177e4SLinus Torvalds 309667ef3c3SDavid S. Millerconfig SUNVDC 310667ef3c3SDavid S. Miller tristate "Sun Virtual Disk Client support" 311667ef3c3SDavid S. Miller depends on SUN_LDOMS 312667ef3c3SDavid S. Miller help 313667ef3c3SDavid S. Miller Support for virtual disk devices as a client under Sun 314667ef3c3SDavid S. Miller Logical Domains. 315667ef3c3SDavid S. Miller 31661d48c2cSMartin Schwidefskysource "drivers/s390/block/Kconfig" 31761d48c2cSMartin Schwidefsky 3189f27ee59SJeremy Fitzhardingeconfig XEN_BLKDEV_FRONTEND 3199f27ee59SJeremy Fitzhardinge tristate "Xen virtual block device support" 3209f27ee59SJeremy Fitzhardinge depends on XEN 3219f27ee59SJeremy Fitzhardinge default y 3222de06cc1SIan Campbell select XEN_XENBUS_FRONTEND 3239f27ee59SJeremy Fitzhardinge help 3249f27ee59SJeremy Fitzhardinge This driver implements the front-end of the Xen virtual 3259f27ee59SJeremy Fitzhardinge block device driver. It communicates with a back-end driver 3269f27ee59SJeremy Fitzhardinge in another domain which drives the actual block device. 3279f27ee59SJeremy Fitzhardinge 328dfc07b13SKonrad Rzeszutek Wilkconfig XEN_BLKDEV_BACKEND 329ea5e1161SKonrad Rzeszutek Wilk tristate "Xen block-device backend driver" 330dfc07b13SKonrad Rzeszutek Wilk depends on XEN_BACKEND 331dfc07b13SKonrad Rzeszutek Wilk help 332dfc07b13SKonrad Rzeszutek Wilk The block-device backend driver allows the kernel to export its 333dfc07b13SKonrad Rzeszutek Wilk block devices to other guests via a high-performance shared-memory 334dfc07b13SKonrad Rzeszutek Wilk interface. 335dfc07b13SKonrad Rzeszutek Wilk 336a4c34858SKonrad Rzeszutek Wilk The corresponding Linux frontend driver is enabled by the 337a4c34858SKonrad Rzeszutek Wilk CONFIG_XEN_BLKDEV_FRONTEND configuration option. 338a4c34858SKonrad Rzeszutek Wilk 339a4c34858SKonrad Rzeszutek Wilk The backend driver attaches itself to a any block device specified 340a4c34858SKonrad Rzeszutek Wilk in the XenBus configuration. There are no limits to what the block 341a4c34858SKonrad Rzeszutek Wilk device as long as it has a major and minor. 342a4c34858SKonrad Rzeszutek Wilk 343a4c34858SKonrad Rzeszutek Wilk If you are compiling a kernel to run in a Xen block backend driver 344a4c34858SKonrad Rzeszutek Wilk domain (often this is domain 0) you should say Y here. To 345a4c34858SKonrad Rzeszutek Wilk compile this driver as a module, chose M here: the module 346a4c34858SKonrad Rzeszutek Wilk will be called xen-blkback. 347a4c34858SKonrad Rzeszutek Wilk 348a4c34858SKonrad Rzeszutek Wilk 349e467cde2SRusty Russellconfig VIRTIO_BLK 350b8977285SKees Cook tristate "Virtio block driver" 351b8977285SKees Cook depends on VIRTIO 35202746e26SMax Gurtovoy select SG_POOL 353a7f7f624SMasahiro Yamada help 3540ad07ec1SAnthony Liguori This is the virtual block driver for virtio. It can be used with 355ecda85e7SJuergen Gross QEMU based VMMs (like KVM or Xen). Say Y or M. 356e467cde2SRusty Russell 357bc5b533bSAndreas Hindborgconfig BLK_DEV_RUST_NULL 358bc5b533bSAndreas Hindborg tristate "Rust null block driver (Experimental)" 359bc5b533bSAndreas Hindborg depends on RUST 360bc5b533bSAndreas Hindborg help 361bc5b533bSAndreas Hindborg This is the Rust implementation of the null block driver. For now it 362bc5b533bSAndreas Hindborg is only a minimal stub. 363bc5b533bSAndreas Hindborg 364bc5b533bSAndreas Hindborg If unsure, say N. 365bc5b533bSAndreas Hindborg 366602adf40SYehuda Sadehconfig BLK_DEV_RBD 367602adf40SYehuda Sadeh tristate "Rados block device (RBD)" 368b8977285SKees Cook depends on INET && BLOCK 369602adf40SYehuda Sadeh select CEPH_LIB 370602adf40SYehuda Sadeh select LIBCRC32C 371602adf40SYehuda Sadeh select CRYPTO_AES 372602adf40SYehuda Sadeh select CRYPTO 373602adf40SYehuda Sadeh help 374602adf40SYehuda Sadeh Say Y here if you want include the Rados block device, which stripes 375602adf40SYehuda Sadeh a block device over objects stored in the Ceph distributed object 376602adf40SYehuda Sadeh store. 377602adf40SYehuda Sadeh 378602adf40SYehuda Sadeh More information at http://ceph.newdream.net/. 379602adf40SYehuda Sadeh 380602adf40SYehuda Sadeh If unsure, say N. 381602adf40SYehuda Sadeh 38271f28f31SMing Leiconfig BLK_DEV_UBLK 38371f28f31SMing Lei tristate "Userspace block driver (Experimental)" 38471f28f31SMing Lei select IO_URING 38571f28f31SMing Lei help 38671f28f31SMing Lei io_uring based userspace block driver. Together with ublk server, ublk 38771f28f31SMing Lei has been working well, but interface with userspace or command data 38871f28f31SMing Lei definition isn't finalized yet, and might change according to future 38971f28f31SMing Lei requirement, so mark is as experimental now. 39071f28f31SMing Lei 391d57c2c6cSMing Lei Say Y if you want to get better performance because task_work_add() 392d57c2c6cSMing Lei can be used in IO path for replacing io_uring cmd, which will become 393d57c2c6cSMing Lei shared between IO tasks and ubq daemon, meantime task_work_add() can 394d57c2c6cSMing Lei can handle batch more effectively, but task_work_add() isn't exported 395d57c2c6cSMing Lei for module, so ublk has to be built to kernel. 396d57c2c6cSMing Lei 3972d786e66SMing Leiconfig BLKDEV_UBLK_LEGACY_OPCODES 3982d786e66SMing Lei bool "Support legacy command opcode" 3992d786e66SMing Lei depends on BLK_DEV_UBLK 4002d786e66SMing Lei default y 4012d786e66SMing Lei help 4022d786e66SMing Lei ublk driver started to take plain command encoding, which turns out 4032d786e66SMing Lei one bad way. The traditional ioctl command opcode encodes more 4042d786e66SMing Lei info and basically defines each code uniquely, so opcode conflict 4052d786e66SMing Lei is avoided, and driver can handle wrong command easily, meantime it 4062d786e66SMing Lei may help security subsystem to audit io_uring command. 4072d786e66SMing Lei 4082d786e66SMing Lei Say Y if your application still uses legacy command opcode. 4092d786e66SMing Lei 4102d786e66SMing Lei Say N if you don't want to support legacy command opcode. It is 4112d786e66SMing Lei suggested to enable N if your application(ublk server) switches to 4122d786e66SMing Lei ioctl command encoding. 4132d786e66SMing Lei 414bc018853SJack Wangsource "drivers/block/rnbd/Kconfig" 415bc018853SJack Wang 416fd11d171SJan Engelhardtendif # BLK_DEV 417