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 source "drivers/block/null_blk/Kconfig"
22 tristate "Normal floppy disk support"
23 depends on ARCH_MAY_HAVE_PC_FDC
25 If you want to use the floppy disk drive(s) of your PC under Linux,
26 say Y. Information about this driver, especially important for IBM
27 Thinkpad users, is contained in
28 <file:Documentation/admin-guide/blockdev/floppy.rst>.
29 That file also contains the location of the Floppy driver FAQ as
30 well as location of the fdutils package used to configure additional
31 parameters of the driver at run time.
33 To compile this driver as a module, choose M here: the
34 module will be called floppy.
37 tristate "Amiga floppy support"
41 tristate "Atari floppy support"
45 tristate "Support for PowerMac floppy"
46 depends on PPC_PMAC && !PPC_PMAC64
48 If you have a SWIM-3 (Super Woz Integrated Machine 3; from Apple)
49 floppy controller, say Y here. Most commonly found in PowerMacs.
52 tristate "Support for SWIM Macintosh floppy"
53 depends on M68K && MAC
55 You should select this option if you want floppy support
56 and you don't have a II, IIfx, Q900, Q950 or AV series.
59 tristate "Amiga Zorro II ramdisk support"
62 This enables support for using Chip RAM and Zorro II RAM as a
63 ramdisk or as a swap partition. Say Y if you want to include this
66 To compile this driver as a module, choose M here: the
67 module will be called z2ram.
71 select BLK_SCSI_REQUEST
74 tristate "SEGA Dreamcast GD-ROM drive"
75 depends on SH_DREAMCAST
78 A standard SEGA Dreamcast comes with a modified CD ROM drive called a
79 "GD-ROM" by SEGA to signify it is capable of reading special disks
80 with up to 1 GB of data. This drive will also read standard CD ROM
81 disks. Select this option to access any disks in your GD ROM drive.
82 Most users will want to say "Y" here.
83 You can also build this as a module which will be called gdrom.
86 tristate "Parallel port IDE device support"
89 There are many external CD-ROM and disk devices that connect through
90 your computer's parallel port. Most of them are actually IDE devices
91 using a parallel port IDE adapter. This option enables the PARIDE
92 subsystem which contains drivers for many of these external drives.
93 Read <file:Documentation/admin-guide/blockdev/paride.rst> for more information.
95 If you have said Y to the "Parallel-port support" configuration
96 option, you may share a single port between your printer and other
97 parallel port devices. Answer Y to build PARIDE support into your
98 kernel, or M if you would like to build it as a loadable module. If
99 your parallel port support is in a loadable module, you must build
100 PARIDE as a module. If you built PARIDE support into your kernel,
101 you may still build the individual protocol modules and high-level
102 drivers as loadable modules. If you build this support as a module,
103 it will be called paride.
105 To use the PARIDE support, you must say Y or M here and also to at
106 least one high-level driver (e.g. "Parallel port IDE disks",
107 "Parallel port ATAPI CD-ROMs", "Parallel port ATAPI disks" etc.) and
108 to at least one protocol driver (e.g. "ATEN EH-100 protocol",
109 "MicroSolutions backpack protocol", "DataStor Commuter protocol"
112 source "drivers/block/paride/Kconfig"
114 source "drivers/block/mtip32xx/Kconfig"
116 source "drivers/block/zram/Kconfig"
119 tristate "Micro Memory MM5415 Battery Backed RAM support"
122 Saying Y here will include support for the MM5415 family of
123 battery backed (Non-volatile) RAM cards.
124 <http://www.umem.com/>
126 The cards appear as block devices that can be partitioned into
127 as many as 15 partitions.
129 To compile this driver as a module, choose M here: the
130 module will be called umem.
132 The umem driver has not yet been allocated a MAJOR number, so
133 one is chosen dynamically.
136 bool "Virtual block device"
139 The User-Mode Linux port includes a driver called UBD which will let
140 you access arbitrary files on the host computer as block devices.
141 Unless you know that you do not need such virtual block devices say
144 config BLK_DEV_UBD_SYNC
145 bool "Always do synchronous disk IO for UBD"
146 depends on BLK_DEV_UBD
148 Writes to the virtual block device are not immediately written to the
149 host's disk; this may cause problems if, for example, the User-Mode
150 Linux 'Virtual Machine' uses a journalling filesystem and the host
153 Synchronous operation (i.e. always writing data to the host's disk
154 immediately) is configurable on a per-UBD basis by using a special
155 kernel command line option. Alternatively, you can say Y here to
156 turn on synchronous operation by default for all block devices.
158 If you're running a journalling file system (like reiserfs, for
159 example) in your virtual machine, you will want to say Y here. If
160 you care for the safety of the data in your virtual machine, Y is a
161 wise choice too. In all other cases (for example, if you're just
162 playing around with User-Mode Linux) you can choose N.
164 config BLK_DEV_COW_COMMON
169 tristate "Loopback device support"
171 Saying Y here will allow you to use a regular file as a block
172 device; you can then create a file system on that block device and
173 mount it just as you would mount other block devices such as hard
174 drive partitions, CD-ROM drives or floppy drives. The loop devices
175 are block special device files with major number 7 and typically
176 called /dev/loop0, /dev/loop1 etc.
178 This is useful if you want to check an ISO 9660 file system before
179 burning the CD, or if you want to use floppy images without first
180 writing them to floppy. Furthermore, some Linux distributions avoid
181 the need for a dedicated Linux partition by keeping their complete
182 root file system inside a DOS FAT file using this loop device
185 To use the loop device, you need the losetup utility, found in the
186 util-linux package, see
187 <https://www.kernel.org/pub/linux/utils/util-linux/>.
189 The loop device driver can also be used to "hide" a file system in
190 a disk partition, floppy, or regular file, either using encryption
191 (scrambling the data) or steganography (hiding the data in the low
192 bits of, say, a sound file). This is also safe if the file resides
193 on a remote file server.
195 There are several ways of encrypting disks. Some of these require
196 kernel patches. The vanilla kernel offers the cryptoloop option
197 and a Device Mapper target (which is superior, as it supports all
198 file systems). If you want to use the cryptoloop, say Y to both
199 LOOP and CRYPTOLOOP, and make sure you have a recent (version 2.12
200 or later) version of util-linux. Additionally, be aware that
201 the cryptoloop is not safe for storing journaled filesystems.
203 Note that this loop device has nothing to do with the loopback
204 device used for network connections from the machine to itself.
206 To compile this driver as a module, choose M here: the
207 module will be called loop.
209 Most users will answer N here.
211 config BLK_DEV_LOOP_MIN_COUNT
212 int "Number of loop devices to pre-create at init time"
213 depends on BLK_DEV_LOOP
216 Static number of loop devices to be unconditionally pre-created
219 This default value can be overwritten on the kernel command
220 line or with module-parameter loop.max_loop.
222 The historic default is 8. If a late 2011 version of losetup(8)
223 is used, it can be set to 0, since needed loop devices can be
224 dynamically allocated with the /dev/loop-control interface.
226 config BLK_DEV_CRYPTOLOOP
227 tristate "Cryptoloop Support"
230 depends on BLK_DEV_LOOP
232 Say Y here if you want to be able to use the ciphers that are
233 provided by the CryptoAPI as loop transformation. This might be
234 used as hard disk encryption.
236 WARNING: This device is not safe for journaled file systems like
237 ext3 or Reiserfs. Please use the Device Mapper crypto module
238 instead, which can be configured to be on-disk compatible with the
241 source "drivers/block/drbd/Kconfig"
244 tristate "Network block device support"
247 Saying Y here will allow your computer to be a client for network
248 block devices, i.e. it will be able to use block devices exported by
249 servers (mount file systems on them etc.). Communication between
250 client and server works over TCP/IP networking, but to the client
251 program this is hidden: it looks like a regular local file access to
252 a block device special file such as /dev/nd0.
254 Network block devices also allows you to run a block-device in
255 userland (making server and client physically the same computer,
256 communicating using the loopback network device).
258 Read <file:Documentation/admin-guide/blockdev/nbd.rst> for more information,
259 especially about where to find the server code, which runs in user
260 space and does not need special kernel support.
262 Note that this has nothing to do with the network file systems NFS
263 or Coda; you can say N here even if you intend to use NFS or Coda.
265 To compile this driver as a module, choose M here: the
266 module will be called nbd.
271 tristate "STEC S1120 Block Driver"
275 Saying Y or M here will enable support for the
276 STEC, Inc. S1120 PCIe SSD.
278 Use device /dev/skd$N amd /dev/skd$Np$M.
281 tristate "Promise SATA SX8 support"
284 Saying Y or M here will enable support for the
285 Promise SATA SX8 controllers.
287 Use devices /dev/sx8/$N and /dev/sx8/$Np$M.
290 tristate "RAM block device support"
292 Saying Y here will allow you to use a portion of your RAM memory as
293 a block device, so that you can make file systems on it, read and
294 write to it and do all the other things that you can do with normal
295 block devices (such as hard drives). It is usually used to load and
296 store a copy of a minimal root file system off of a floppy into RAM
297 during the initial install of Linux.
299 Note that the kernel command line option "ramdisk=XX" is now obsolete.
300 For details, read <file:Documentation/admin-guide/blockdev/ramdisk.rst>.
302 To compile this driver as a module, choose M here: the
303 module will be called brd. An alias "rd" has been defined
304 for historical reasons.
306 Most normal users won't need the RAM disk functionality, and can
309 config BLK_DEV_RAM_COUNT
310 int "Default number of RAM disks"
312 depends on BLK_DEV_RAM
314 The default value is 16 RAM disks. Change this if you know what you
315 are doing. If you boot from a filesystem that needs to be extracted
316 in memory, you will need at least one RAM disk (e.g. root on cramfs).
318 config BLK_DEV_RAM_SIZE
319 int "Default RAM disk size (kbytes)"
320 depends on BLK_DEV_RAM
323 The default value is 4096 kilobytes. Only change this if you know
327 tristate "Packet writing on CD/DVD media (DEPRECATED)"
330 select BLK_SCSI_REQUEST
332 Note: This driver is deprecated and will be removed from the
333 kernel in the near future!
335 If you have a CDROM/DVD drive that supports packet writing, say
336 Y to include support. It should work with any MMC/Mt Fuji
337 compliant ATAPI or SCSI drive, which is just about any newer
340 Currently only writing to CD-RW, DVD-RW, DVD+RW and DVDRAM discs
342 DVD-RW disks must be in restricted overwrite mode.
344 See the file <file:Documentation/cdrom/packet-writing.rst>
345 for further information on the use of this driver.
347 To compile this driver as a module, choose M here: the
348 module will be called pktcdvd.
350 config CDROM_PKTCDVD_BUFFERS
351 int "Free buffers for data gathering"
352 depends on CDROM_PKTCDVD
355 This controls the maximum number of active concurrent packets. More
356 concurrent packets can increase write performance, but also require
357 more memory. Each concurrent packet will require approximately 64Kb
358 of non-swappable kernel memory, memory which will be allocated when
359 a disc is opened for writing.
361 config CDROM_PKTCDVD_WCACHE
362 bool "Enable write caching"
363 depends on CDROM_PKTCDVD
365 If enabled, write caching will be set for the CD-R/W device. For now
366 this option is dangerous unless the CD-RW media is known good, as we
367 don't do deferred write error handling yet.
370 tristate "ATA over Ethernet support"
373 This driver provides Support for ATA over Ethernet block
374 devices like the Coraid EtherDrive (R) Storage Blade.
377 tristate "Sun Virtual Disk Client support"
380 Support for virtual disk devices as a client under Sun
383 source "drivers/s390/block/Kconfig"
386 tristate "Xilinx SystemACE support"
387 depends on 4xx || MICROBLAZE
389 Include support for the Xilinx SystemACE CompactFlash interface
391 config XEN_BLKDEV_FRONTEND
392 tristate "Xen virtual block device support"
395 select XEN_XENBUS_FRONTEND
397 This driver implements the front-end of the Xen virtual
398 block device driver. It communicates with a back-end driver
399 in another domain which drives the actual block device.
401 config XEN_BLKDEV_BACKEND
402 tristate "Xen block-device backend driver"
403 depends on XEN_BACKEND
405 The block-device backend driver allows the kernel to export its
406 block devices to other guests via a high-performance shared-memory
409 The corresponding Linux frontend driver is enabled by the
410 CONFIG_XEN_BLKDEV_FRONTEND configuration option.
412 The backend driver attaches itself to a any block device specified
413 in the XenBus configuration. There are no limits to what the block
414 device as long as it has a major and minor.
416 If you are compiling a kernel to run in a Xen block backend driver
417 domain (often this is domain 0) you should say Y here. To
418 compile this driver as a module, chose M here: the module
419 will be called xen-blkback.
423 tristate "Virtio block driver"
426 This is the virtual block driver for virtio. It can be used with
427 QEMU based VMMs (like KVM or Xen). Say Y or M.
430 tristate "Rados block device (RBD)"
431 depends on INET && BLOCK
437 Say Y here if you want include the Rados block device, which stripes
438 a block device over objects stored in the Ceph distributed object
441 More information at http://ceph.newdream.net/.
446 tristate "IBM Flash Adapter 900GB Full Height PCIe Device Driver"
450 Device driver for IBM's high speed PCIe SSD
451 storage device: Flash Adapter 900GB Full Height.
453 To compile this driver as a module, choose M here: the
454 module will be called rsxx.
456 source "drivers/block/rnbd/Kconfig"