2 # Block device driver configuration
10 Say Y here to get to see options for various different block device
11 drivers. This option alone does not add any kernel code.
13 If you say N, all options in this submenu will be skipped and disabled;
14 only do this if you know what you are doing.
18 config BLK_DEV_NULL_BLK
19 tristate "Null test block driver"
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/blockdev/floppy.txt>.
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.
70 tristate "SEGA Dreamcast GD-ROM drive"
71 depends on SH_DREAMCAST
72 select BLK_SCSI_REQUEST # only for the generic cdrom code
74 A standard SEGA Dreamcast comes with a modified CD ROM drive called a
75 "GD-ROM" by SEGA to signify it is capable of reading special disks
76 with up to 1 GB of data. This drive will also read standard CD ROM
77 disks. Select this option to access any disks in your GD ROM drive.
78 Most users will want to say "Y" here.
79 You can also build this as a module which will be called gdrom.
82 tristate "Parallel port IDE device support"
85 There are many external CD-ROM and disk devices that connect through
86 your computer's parallel port. Most of them are actually IDE devices
87 using a parallel port IDE adapter. This option enables the PARIDE
88 subsystem which contains drivers for many of these external drives.
89 Read <file:Documentation/blockdev/paride.txt> for more information.
91 If you have said Y to the "Parallel-port support" configuration
92 option, you may share a single port between your printer and other
93 parallel port devices. Answer Y to build PARIDE support into your
94 kernel, or M if you would like to build it as a loadable module. If
95 your parallel port support is in a loadable module, you must build
96 PARIDE as a module. If you built PARIDE support into your kernel,
97 you may still build the individual protocol modules and high-level
98 drivers as loadable modules. If you build this support as a module,
99 it will be called paride.
101 To use the PARIDE support, you must say Y or M here and also to at
102 least one high-level driver (e.g. "Parallel port IDE disks",
103 "Parallel port ATAPI CD-ROMs", "Parallel port ATAPI disks" etc.) and
104 to at least one protocol driver (e.g. "ATEN EH-100 protocol",
105 "MicroSolutions backpack protocol", "DataStor Commuter protocol"
108 source "drivers/block/paride/Kconfig"
110 source "drivers/block/mtip32xx/Kconfig"
112 source "drivers/block/zram/Kconfig"
114 config BLK_CPQ_CISS_DA
115 tristate "Compaq Smart Array 5xxx support"
117 select CHECK_SIGNATURE
118 select BLK_SCSI_REQUEST
120 This is the driver for Compaq Smart Array 5xxx controllers.
121 Everyone using these boards should say Y here.
122 See <file:Documentation/blockdev/cciss.txt> for the current list of
123 boards supported by this driver, and for further information
124 on the use of this driver.
126 config CISS_SCSI_TAPE
127 bool "SCSI tape drive support for Smart Array 5xxx"
128 depends on BLK_CPQ_CISS_DA && PROC_FS
129 depends on SCSI=y || SCSI=BLK_CPQ_CISS_DA
131 When enabled (Y), this option allows SCSI tape drives and SCSI medium
132 changers (tape robots) to be accessed via a Compaq 5xxx array
133 controller. (See <file:Documentation/blockdev/cciss.txt> for more details.)
135 "SCSI support" and "SCSI tape support" must also be enabled for this
138 When this option is disabled (N), the SCSI portion of the driver
141 config BLK_DEV_DAC960
142 tristate "Mylex DAC960/DAC1100 PCI RAID Controller support"
145 This driver adds support for the Mylex DAC960, AcceleRAID, and
146 eXtremeRAID PCI RAID controllers. See the file
147 <file:Documentation/blockdev/README.DAC960> for further information
150 To compile this driver as a module, choose M here: the
151 module will be called DAC960.
154 tristate "Micro Memory MM5415 Battery Backed RAM support"
157 Saying Y here will include support for the MM5415 family of
158 battery backed (Non-volatile) RAM cards.
159 <http://www.umem.com/>
161 The cards appear as block devices that can be partitioned into
162 as many as 15 partitions.
164 To compile this driver as a module, choose M here: the
165 module will be called umem.
167 The umem driver has not yet been allocated a MAJOR number, so
168 one is chosen dynamically.
171 bool "Virtual block device"
174 The User-Mode Linux port includes a driver called UBD which will let
175 you access arbitrary files on the host computer as block devices.
176 Unless you know that you do not need such virtual block devices say
179 config BLK_DEV_UBD_SYNC
180 bool "Always do synchronous disk IO for UBD"
181 depends on BLK_DEV_UBD
183 Writes to the virtual block device are not immediately written to the
184 host's disk; this may cause problems if, for example, the User-Mode
185 Linux 'Virtual Machine' uses a journalling filesystem and the host
188 Synchronous operation (i.e. always writing data to the host's disk
189 immediately) is configurable on a per-UBD basis by using a special
190 kernel command line option. Alternatively, you can say Y here to
191 turn on synchronous operation by default for all block devices.
193 If you're running a journalling file system (like reiserfs, for
194 example) in your virtual machine, you will want to say Y here. If
195 you care for the safety of the data in your virtual machine, Y is a
196 wise choice too. In all other cases (for example, if you're just
197 playing around with User-Mode Linux) you can choose N.
199 config BLK_DEV_COW_COMMON
204 tristate "Loopback device support"
206 Saying Y here will allow you to use a regular file as a block
207 device; you can then create a file system on that block device and
208 mount it just as you would mount other block devices such as hard
209 drive partitions, CD-ROM drives or floppy drives. The loop devices
210 are block special device files with major number 7 and typically
211 called /dev/loop0, /dev/loop1 etc.
213 This is useful if you want to check an ISO 9660 file system before
214 burning the CD, or if you want to use floppy images without first
215 writing them to floppy. Furthermore, some Linux distributions avoid
216 the need for a dedicated Linux partition by keeping their complete
217 root file system inside a DOS FAT file using this loop device
220 To use the loop device, you need the losetup utility, found in the
221 util-linux package, see
222 <https://www.kernel.org/pub/linux/utils/util-linux/>.
224 The loop device driver can also be used to "hide" a file system in
225 a disk partition, floppy, or regular file, either using encryption
226 (scrambling the data) or steganography (hiding the data in the low
227 bits of, say, a sound file). This is also safe if the file resides
228 on a remote file server.
230 There are several ways of encrypting disks. Some of these require
231 kernel patches. The vanilla kernel offers the cryptoloop option
232 and a Device Mapper target (which is superior, as it supports all
233 file systems). If you want to use the cryptoloop, say Y to both
234 LOOP and CRYPTOLOOP, and make sure you have a recent (version 2.12
235 or later) version of util-linux. Additionally, be aware that
236 the cryptoloop is not safe for storing journaled filesystems.
238 Note that this loop device has nothing to do with the loopback
239 device used for network connections from the machine to itself.
241 To compile this driver as a module, choose M here: the
242 module will be called loop.
244 Most users will answer N here.
246 config BLK_DEV_LOOP_MIN_COUNT
247 int "Number of loop devices to pre-create at init time"
248 depends on BLK_DEV_LOOP
251 Static number of loop devices to be unconditionally pre-created
254 This default value can be overwritten on the kernel command
255 line or with module-parameter loop.max_loop.
257 The historic default is 8. If a late 2011 version of losetup(8)
258 is used, it can be set to 0, since needed loop devices can be
259 dynamically allocated with the /dev/loop-control interface.
261 config BLK_DEV_CRYPTOLOOP
262 tristate "Cryptoloop Support"
265 depends on BLK_DEV_LOOP
267 Say Y here if you want to be able to use the ciphers that are
268 provided by the CryptoAPI as loop transformation. This might be
269 used as hard disk encryption.
271 WARNING: This device is not safe for journaled file systems like
272 ext3 or Reiserfs. Please use the Device Mapper crypto module
273 instead, which can be configured to be on-disk compatible with the
276 source "drivers/block/drbd/Kconfig"
279 tristate "Network block device support"
282 Saying Y here will allow your computer to be a client for network
283 block devices, i.e. it will be able to use block devices exported by
284 servers (mount file systems on them etc.). Communication between
285 client and server works over TCP/IP networking, but to the client
286 program this is hidden: it looks like a regular local file access to
287 a block device special file such as /dev/nd0.
289 Network block devices also allows you to run a block-device in
290 userland (making server and client physically the same computer,
291 communicating using the loopback network device).
293 Read <file:Documentation/blockdev/nbd.txt> for more information,
294 especially about where to find the server code, which runs in user
295 space and does not need special kernel support.
297 Note that this has nothing to do with the network file systems NFS
298 or Coda; you can say N here even if you intend to use NFS or Coda.
300 To compile this driver as a module, choose M here: the
301 module will be called nbd.
306 tristate "STEC S1120 Block Driver"
310 Saying Y or M here will enable support for the
311 STEC, Inc. S1120 PCIe SSD.
313 Use device /dev/skd$N amd /dev/skd$Np$M.
316 tristate "Promise SATA SX8 support"
319 Saying Y or M here will enable support for the
320 Promise SATA SX8 controllers.
322 Use devices /dev/sx8/$N and /dev/sx8/$Np$M.
325 tristate "RAM block device support"
326 select DAX if BLK_DEV_RAM_DAX
328 Saying Y here will allow you to use a portion of your RAM memory as
329 a block device, so that you can make file systems on it, read and
330 write to it and do all the other things that you can do with normal
331 block devices (such as hard drives). It is usually used to load and
332 store a copy of a minimal root file system off of a floppy into RAM
333 during the initial install of Linux.
335 Note that the kernel command line option "ramdisk=XX" is now obsolete.
336 For details, read <file:Documentation/blockdev/ramdisk.txt>.
338 To compile this driver as a module, choose M here: the
339 module will be called brd. An alias "rd" has been defined
340 for historical reasons.
342 Most normal users won't need the RAM disk functionality, and can
345 config BLK_DEV_RAM_COUNT
346 int "Default number of RAM disks"
348 depends on BLK_DEV_RAM
350 The default value is 16 RAM disks. Change this if you know what you
351 are doing. If you boot from a filesystem that needs to be extracted
352 in memory, you will need at least one RAM disk (e.g. root on cramfs).
354 config BLK_DEV_RAM_SIZE
355 int "Default RAM disk size (kbytes)"
356 depends on BLK_DEV_RAM
359 The default value is 4096 kilobytes. Only change this if you know
362 config BLK_DEV_RAM_DAX
363 bool "Support Direct Access (DAX) to RAM block devices"
364 depends on BLK_DEV_RAM && FS_DAX
367 Support filesystems using DAX to access RAM block devices. This
368 avoids double-buffering data in the page cache before copying it
369 to the block device. Answering Y will slightly enlarge the kernel,
370 and will prevent RAM block device backing store memory from being
371 allocated from highmem (only a problem for highmem systems).
374 tristate "Packet writing on CD/DVD media (DEPRECATED)"
376 select BLK_SCSI_REQUEST
378 Note: This driver is deprecated and will be removed from the
379 kernel in the near future!
381 If you have a CDROM/DVD drive that supports packet writing, say
382 Y to include support. It should work with any MMC/Mt Fuji
383 compliant ATAPI or SCSI drive, which is just about any newer
386 Currently only writing to CD-RW, DVD-RW, DVD+RW and DVDRAM discs
388 DVD-RW disks must be in restricted overwrite mode.
390 See the file <file:Documentation/cdrom/packet-writing.txt>
391 for further information on the use of this driver.
393 To compile this driver as a module, choose M here: the
394 module will be called pktcdvd.
396 config CDROM_PKTCDVD_BUFFERS
397 int "Free buffers for data gathering"
398 depends on CDROM_PKTCDVD
401 This controls the maximum number of active concurrent packets. More
402 concurrent packets can increase write performance, but also require
403 more memory. Each concurrent packet will require approximately 64Kb
404 of non-swappable kernel memory, memory which will be allocated when
405 a disc is opened for writing.
407 config CDROM_PKTCDVD_WCACHE
408 bool "Enable write caching"
409 depends on CDROM_PKTCDVD
411 If enabled, write caching will be set for the CD-R/W device. For now
412 this option is dangerous unless the CD-RW media is known good, as we
413 don't do deferred write error handling yet.
416 tristate "ATA over Ethernet support"
419 This driver provides Support for ATA over Ethernet block
420 devices like the Coraid EtherDrive (R) Storage Blade.
423 tristate "Sun Virtual Disk Client support"
426 Support for virtual disk devices as a client under Sun
429 source "drivers/s390/block/Kconfig"
432 tristate "Xilinx SystemACE support"
433 depends on 4xx || MICROBLAZE
435 Include support for the Xilinx SystemACE CompactFlash interface
437 config XEN_BLKDEV_FRONTEND
438 tristate "Xen virtual block device support"
441 select XEN_XENBUS_FRONTEND
443 This driver implements the front-end of the Xen virtual
444 block device driver. It communicates with a back-end driver
445 in another domain which drives the actual block device.
447 config XEN_BLKDEV_BACKEND
448 tristate "Xen block-device backend driver"
449 depends on XEN_BACKEND
451 The block-device backend driver allows the kernel to export its
452 block devices to other guests via a high-performance shared-memory
455 The corresponding Linux frontend driver is enabled by the
456 CONFIG_XEN_BLKDEV_FRONTEND configuration option.
458 The backend driver attaches itself to a any block device specified
459 in the XenBus configuration. There are no limits to what the block
460 device as long as it has a major and minor.
462 If you are compiling a kernel to run in a Xen block backend driver
463 domain (often this is domain 0) you should say Y here. To
464 compile this driver as a module, chose M here: the module
465 will be called xen-blkback.
469 tristate "Virtio block driver"
472 This is the virtual block driver for virtio. It can be used with
473 lguest or QEMU based VMMs (like KVM or Xen). Say Y or M.
475 config VIRTIO_BLK_SCSI
476 bool "SCSI passthrough request for the Virtio block driver"
477 depends on VIRTIO_BLK
478 select BLK_SCSI_REQUEST
480 Enable support for SCSI passthrough (e.g. the SG_IO ioctl) on
481 virtio-blk devices. This is only supported for the legacy
482 virtio protocol and not enabled by default by any hypervisor.
483 You probably want to use virtio-scsi instead.
486 tristate "Rados block device (RBD)"
487 depends on INET && BLOCK
494 Say Y here if you want include the Rados block device, which stripes
495 a block device over objects stored in the Ceph distributed object
498 More information at http://ceph.newdream.net/.
503 tristate "IBM Flash Adapter 900GB Full Height PCIe Device Driver"
506 Device driver for IBM's high speed PCIe SSD
507 storage device: Flash Adapter 900GB Full Height.
509 To compile this driver as a module, choose M here: the
510 module will be called rsxx.