1 # SPDX-License-Identifier: GPL-2.0
3 # Block device driver configuration
11 Say Y here to get to see options for various different block device
12 drivers. This option alone does not add any kernel code.
14 If you say N, all options in this submenu will be skipped and disabled;
15 only do this if you know what you are doing.
19 config BLK_DEV_NULL_BLK
20 tristate "Null test block driver"
23 config BLK_DEV_NULL_BLK_FAULT_INJECTION
24 bool "Support fault injection for Null test block driver"
25 depends on BLK_DEV_NULL_BLK && FAULT_INJECTION
28 tristate "Normal floppy disk support"
29 depends on ARCH_MAY_HAVE_PC_FDC
31 If you want to use the floppy disk drive(s) of your PC under Linux,
32 say Y. Information about this driver, especially important for IBM
33 Thinkpad users, is contained in
34 <file:Documentation/admin-guide/blockdev/floppy.rst>.
35 That file also contains the location of the Floppy driver FAQ as
36 well as location of the fdutils package used to configure additional
37 parameters of the driver at run time.
39 To compile this driver as a module, choose M here: the
40 module will be called floppy.
43 tristate "Amiga floppy support"
47 tristate "Atari floppy support"
51 tristate "Support for PowerMac floppy"
52 depends on PPC_PMAC && !PPC_PMAC64
54 If you have a SWIM-3 (Super Woz Integrated Machine 3; from Apple)
55 floppy controller, say Y here. Most commonly found in PowerMacs.
58 tristate "Support for SWIM Macintosh floppy"
59 depends on M68K && MAC
61 You should select this option if you want floppy support
62 and you don't have a II, IIfx, Q900, Q950 or AV series.
65 tristate "Amiga Zorro II ramdisk support"
68 This enables support for using Chip RAM and Zorro II RAM as a
69 ramdisk or as a swap partition. Say Y if you want to include this
72 To compile this driver as a module, choose M here: the
73 module will be called z2ram.
77 select BLK_SCSI_REQUEST
80 tristate "SEGA Dreamcast GD-ROM drive"
81 depends on SH_DREAMCAST
84 A standard SEGA Dreamcast comes with a modified CD ROM drive called a
85 "GD-ROM" by SEGA to signify it is capable of reading special disks
86 with up to 1 GB of data. This drive will also read standard CD ROM
87 disks. Select this option to access any disks in your GD ROM drive.
88 Most users will want to say "Y" here.
89 You can also build this as a module which will be called gdrom.
92 tristate "Parallel port IDE device support"
95 There are many external CD-ROM and disk devices that connect through
96 your computer's parallel port. Most of them are actually IDE devices
97 using a parallel port IDE adapter. This option enables the PARIDE
98 subsystem which contains drivers for many of these external drives.
99 Read <file:Documentation/admin-guide/blockdev/paride.rst> for more information.
101 If you have said Y to the "Parallel-port support" configuration
102 option, you may share a single port between your printer and other
103 parallel port devices. Answer Y to build PARIDE support into your
104 kernel, or M if you would like to build it as a loadable module. If
105 your parallel port support is in a loadable module, you must build
106 PARIDE as a module. If you built PARIDE support into your kernel,
107 you may still build the individual protocol modules and high-level
108 drivers as loadable modules. If you build this support as a module,
109 it will be called paride.
111 To use the PARIDE support, you must say Y or M here and also to at
112 least one high-level driver (e.g. "Parallel port IDE disks",
113 "Parallel port ATAPI CD-ROMs", "Parallel port ATAPI disks" etc.) and
114 to at least one protocol driver (e.g. "ATEN EH-100 protocol",
115 "MicroSolutions backpack protocol", "DataStor Commuter protocol"
118 source "drivers/block/paride/Kconfig"
120 source "drivers/block/mtip32xx/Kconfig"
122 source "drivers/block/zram/Kconfig"
125 tristate "Micro Memory MM5415 Battery Backed RAM support"
128 Saying Y here will include support for the MM5415 family of
129 battery backed (Non-volatile) RAM cards.
130 <http://www.umem.com/>
132 The cards appear as block devices that can be partitioned into
133 as many as 15 partitions.
135 To compile this driver as a module, choose M here: the
136 module will be called umem.
138 The umem driver has not yet been allocated a MAJOR number, so
139 one is chosen dynamically.
142 bool "Virtual block device"
145 The User-Mode Linux port includes a driver called UBD which will let
146 you access arbitrary files on the host computer as block devices.
147 Unless you know that you do not need such virtual block devices say
150 config BLK_DEV_UBD_SYNC
151 bool "Always do synchronous disk IO for UBD"
152 depends on BLK_DEV_UBD
154 Writes to the virtual block device are not immediately written to the
155 host's disk; this may cause problems if, for example, the User-Mode
156 Linux 'Virtual Machine' uses a journalling filesystem and the host
159 Synchronous operation (i.e. always writing data to the host's disk
160 immediately) is configurable on a per-UBD basis by using a special
161 kernel command line option. Alternatively, you can say Y here to
162 turn on synchronous operation by default for all block devices.
164 If you're running a journalling file system (like reiserfs, for
165 example) in your virtual machine, you will want to say Y here. If
166 you care for the safety of the data in your virtual machine, Y is a
167 wise choice too. In all other cases (for example, if you're just
168 playing around with User-Mode Linux) you can choose N.
170 config BLK_DEV_COW_COMMON
175 tristate "Loopback device support"
177 Saying Y here will allow you to use a regular file as a block
178 device; you can then create a file system on that block device and
179 mount it just as you would mount other block devices such as hard
180 drive partitions, CD-ROM drives or floppy drives. The loop devices
181 are block special device files with major number 7 and typically
182 called /dev/loop0, /dev/loop1 etc.
184 This is useful if you want to check an ISO 9660 file system before
185 burning the CD, or if you want to use floppy images without first
186 writing them to floppy. Furthermore, some Linux distributions avoid
187 the need for a dedicated Linux partition by keeping their complete
188 root file system inside a DOS FAT file using this loop device
191 To use the loop device, you need the losetup utility, found in the
192 util-linux package, see
193 <https://www.kernel.org/pub/linux/utils/util-linux/>.
195 The loop device driver can also be used to "hide" a file system in
196 a disk partition, floppy, or regular file, either using encryption
197 (scrambling the data) or steganography (hiding the data in the low
198 bits of, say, a sound file). This is also safe if the file resides
199 on a remote file server.
201 There are several ways of encrypting disks. Some of these require
202 kernel patches. The vanilla kernel offers the cryptoloop option
203 and a Device Mapper target (which is superior, as it supports all
204 file systems). If you want to use the cryptoloop, say Y to both
205 LOOP and CRYPTOLOOP, and make sure you have a recent (version 2.12
206 or later) version of util-linux. Additionally, be aware that
207 the cryptoloop is not safe for storing journaled filesystems.
209 Note that this loop device has nothing to do with the loopback
210 device used for network connections from the machine to itself.
212 To compile this driver as a module, choose M here: the
213 module will be called loop.
215 Most users will answer N here.
217 config BLK_DEV_LOOP_MIN_COUNT
218 int "Number of loop devices to pre-create at init time"
219 depends on BLK_DEV_LOOP
222 Static number of loop devices to be unconditionally pre-created
225 This default value can be overwritten on the kernel command
226 line or with module-parameter loop.max_loop.
228 The historic default is 8. If a late 2011 version of losetup(8)
229 is used, it can be set to 0, since needed loop devices can be
230 dynamically allocated with the /dev/loop-control interface.
232 config BLK_DEV_CRYPTOLOOP
233 tristate "Cryptoloop Support"
236 depends on BLK_DEV_LOOP
238 Say Y here if you want to be able to use the ciphers that are
239 provided by the CryptoAPI as loop transformation. This might be
240 used as hard disk encryption.
242 WARNING: This device is not safe for journaled file systems like
243 ext3 or Reiserfs. Please use the Device Mapper crypto module
244 instead, which can be configured to be on-disk compatible with the
247 source "drivers/block/drbd/Kconfig"
250 tristate "Network block device support"
253 Saying Y here will allow your computer to be a client for network
254 block devices, i.e. it will be able to use block devices exported by
255 servers (mount file systems on them etc.). Communication between
256 client and server works over TCP/IP networking, but to the client
257 program this is hidden: it looks like a regular local file access to
258 a block device special file such as /dev/nd0.
260 Network block devices also allows you to run a block-device in
261 userland (making server and client physically the same computer,
262 communicating using the loopback network device).
264 Read <file:Documentation/admin-guide/blockdev/nbd.rst> for more information,
265 especially about where to find the server code, which runs in user
266 space and does not need special kernel support.
268 Note that this has nothing to do with the network file systems NFS
269 or Coda; you can say N here even if you intend to use NFS or Coda.
271 To compile this driver as a module, choose M here: the
272 module will be called nbd.
277 tristate "STEC S1120 Block Driver"
281 Saying Y or M here will enable support for the
282 STEC, Inc. S1120 PCIe SSD.
284 Use device /dev/skd$N amd /dev/skd$Np$M.
287 tristate "Promise SATA SX8 support"
290 Saying Y or M here will enable support for the
291 Promise SATA SX8 controllers.
293 Use devices /dev/sx8/$N and /dev/sx8/$Np$M.
296 tristate "RAM block device support"
298 Saying Y here will allow you to use a portion of your RAM memory as
299 a block device, so that you can make file systems on it, read and
300 write to it and do all the other things that you can do with normal
301 block devices (such as hard drives). It is usually used to load and
302 store a copy of a minimal root file system off of a floppy into RAM
303 during the initial install of Linux.
305 Note that the kernel command line option "ramdisk=XX" is now obsolete.
306 For details, read <file:Documentation/admin-guide/blockdev/ramdisk.rst>.
308 To compile this driver as a module, choose M here: the
309 module will be called brd. An alias "rd" has been defined
310 for historical reasons.
312 Most normal users won't need the RAM disk functionality, and can
315 config BLK_DEV_RAM_COUNT
316 int "Default number of RAM disks"
318 depends on BLK_DEV_RAM
320 The default value is 16 RAM disks. Change this if you know what you
321 are doing. If you boot from a filesystem that needs to be extracted
322 in memory, you will need at least one RAM disk (e.g. root on cramfs).
324 config BLK_DEV_RAM_SIZE
325 int "Default RAM disk size (kbytes)"
326 depends on BLK_DEV_RAM
329 The default value is 4096 kilobytes. Only change this if you know
333 tristate "Packet writing on CD/DVD media (DEPRECATED)"
336 select BLK_SCSI_REQUEST
338 Note: This driver is deprecated and will be removed from the
339 kernel in the near future!
341 If you have a CDROM/DVD drive that supports packet writing, say
342 Y to include support. It should work with any MMC/Mt Fuji
343 compliant ATAPI or SCSI drive, which is just about any newer
346 Currently only writing to CD-RW, DVD-RW, DVD+RW and DVDRAM discs
348 DVD-RW disks must be in restricted overwrite mode.
350 See the file <file:Documentation/cdrom/packet-writing.rst>
351 for further information on the use of this driver.
353 To compile this driver as a module, choose M here: the
354 module will be called pktcdvd.
356 config CDROM_PKTCDVD_BUFFERS
357 int "Free buffers for data gathering"
358 depends on CDROM_PKTCDVD
361 This controls the maximum number of active concurrent packets. More
362 concurrent packets can increase write performance, but also require
363 more memory. Each concurrent packet will require approximately 64Kb
364 of non-swappable kernel memory, memory which will be allocated when
365 a disc is opened for writing.
367 config CDROM_PKTCDVD_WCACHE
368 bool "Enable write caching"
369 depends on CDROM_PKTCDVD
371 If enabled, write caching will be set for the CD-R/W device. For now
372 this option is dangerous unless the CD-RW media is known good, as we
373 don't do deferred write error handling yet.
376 tristate "ATA over Ethernet support"
379 This driver provides Support for ATA over Ethernet block
380 devices like the Coraid EtherDrive (R) Storage Blade.
383 tristate "Sun Virtual Disk Client support"
386 Support for virtual disk devices as a client under Sun
389 source "drivers/s390/block/Kconfig"
392 tristate "Xilinx SystemACE support"
393 depends on 4xx || MICROBLAZE
395 Include support for the Xilinx SystemACE CompactFlash interface
397 config XEN_BLKDEV_FRONTEND
398 tristate "Xen virtual block device support"
401 select XEN_XENBUS_FRONTEND
403 This driver implements the front-end of the Xen virtual
404 block device driver. It communicates with a back-end driver
405 in another domain which drives the actual block device.
407 config XEN_BLKDEV_BACKEND
408 tristate "Xen block-device backend driver"
409 depends on XEN_BACKEND
411 The block-device backend driver allows the kernel to export its
412 block devices to other guests via a high-performance shared-memory
415 The corresponding Linux frontend driver is enabled by the
416 CONFIG_XEN_BLKDEV_FRONTEND configuration option.
418 The backend driver attaches itself to a any block device specified
419 in the XenBus configuration. There are no limits to what the block
420 device as long as it has a major and minor.
422 If you are compiling a kernel to run in a Xen block backend driver
423 domain (often this is domain 0) you should say Y here. To
424 compile this driver as a module, chose M here: the module
425 will be called xen-blkback.
429 tristate "Virtio block driver"
432 This is the virtual block driver for virtio. It can be used with
433 QEMU based VMMs (like KVM or Xen). Say Y or M.
435 config VIRTIO_BLK_SCSI
436 bool "SCSI passthrough request for the Virtio block driver"
437 depends on VIRTIO_BLK
438 select BLK_SCSI_REQUEST
440 Enable support for SCSI passthrough (e.g. the SG_IO ioctl) on
441 virtio-blk devices. This is only supported for the legacy
442 virtio protocol and not enabled by default by any hypervisor.
443 You probably want to use virtio-scsi instead.
446 tristate "Rados block device (RBD)"
447 depends on INET && BLOCK
453 Say Y here if you want include the Rados block device, which stripes
454 a block device over objects stored in the Ceph distributed object
457 More information at http://ceph.newdream.net/.
462 tristate "IBM Flash Adapter 900GB Full Height PCIe Device Driver"
465 Device driver for IBM's high speed PCIe SSD
466 storage device: Flash Adapter 900GB Full Height.
468 To compile this driver as a module, choose M here: the
469 module will be called rsxx.