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
73 A standard SEGA Dreamcast comes with a modified CD ROM drive called a
74 "GD-ROM" by SEGA to signify it is capable of reading special disks
75 with up to 1 GB of data. This drive will also read standard CD ROM
76 disks. Select this option to access any disks in your GD ROM drive.
77 Most users will want to say "Y" here.
78 You can also build this as a module which will be called gdrom.
81 tristate "Parallel port IDE device support"
84 There are many external CD-ROM and disk devices that connect through
85 your computer's parallel port. Most of them are actually IDE devices
86 using a parallel port IDE adapter. This option enables the PARIDE
87 subsystem which contains drivers for many of these external drives.
88 Read <file:Documentation/blockdev/paride.txt> for more information.
90 If you have said Y to the "Parallel-port support" configuration
91 option, you may share a single port between your printer and other
92 parallel port devices. Answer Y to build PARIDE support into your
93 kernel, or M if you would like to build it as a loadable module. If
94 your parallel port support is in a loadable module, you must build
95 PARIDE as a module. If you built PARIDE support into your kernel,
96 you may still build the individual protocol modules and high-level
97 drivers as loadable modules. If you build this support as a module,
98 it will be called paride.
100 To use the PARIDE support, you must say Y or M here and also to at
101 least one high-level driver (e.g. "Parallel port IDE disks",
102 "Parallel port ATAPI CD-ROMs", "Parallel port ATAPI disks" etc.) and
103 to at least one protocol driver (e.g. "ATEN EH-100 protocol",
104 "MicroSolutions backpack protocol", "DataStor Commuter protocol"
107 source "drivers/block/paride/Kconfig"
109 source "drivers/block/mtip32xx/Kconfig"
111 source "drivers/block/zram/Kconfig"
113 config BLK_CPQ_CISS_DA
114 tristate "Compaq Smart Array 5xxx support"
116 select CHECK_SIGNATURE
118 This is the driver for Compaq Smart Array 5xxx controllers.
119 Everyone using these boards should say Y here.
120 See <file:Documentation/blockdev/cciss.txt> for the current list of
121 boards supported by this driver, and for further information
122 on the use of this driver.
124 config CISS_SCSI_TAPE
125 bool "SCSI tape drive support for Smart Array 5xxx"
126 depends on BLK_CPQ_CISS_DA && PROC_FS
127 depends on SCSI=y || SCSI=BLK_CPQ_CISS_DA
129 When enabled (Y), this option allows SCSI tape drives and SCSI medium
130 changers (tape robots) to be accessed via a Compaq 5xxx array
131 controller. (See <file:Documentation/blockdev/cciss.txt> for more details.)
133 "SCSI support" and "SCSI tape support" must also be enabled for this
136 When this option is disabled (N), the SCSI portion of the driver
139 config BLK_DEV_DAC960
140 tristate "Mylex DAC960/DAC1100 PCI RAID Controller support"
143 This driver adds support for the Mylex DAC960, AcceleRAID, and
144 eXtremeRAID PCI RAID controllers. See the file
145 <file:Documentation/blockdev/README.DAC960> for further information
148 To compile this driver as a module, choose M here: the
149 module will be called DAC960.
152 tristate "Micro Memory MM5415 Battery Backed RAM support"
155 Saying Y here will include support for the MM5415 family of
156 battery backed (Non-volatile) RAM cards.
157 <http://www.umem.com/>
159 The cards appear as block devices that can be partitioned into
160 as many as 15 partitions.
162 To compile this driver as a module, choose M here: the
163 module will be called umem.
165 The umem driver has not yet been allocated a MAJOR number, so
166 one is chosen dynamically.
169 bool "Virtual block device"
172 The User-Mode Linux port includes a driver called UBD which will let
173 you access arbitrary files on the host computer as block devices.
174 Unless you know that you do not need such virtual block devices say
177 config BLK_DEV_UBD_SYNC
178 bool "Always do synchronous disk IO for UBD"
179 depends on BLK_DEV_UBD
181 Writes to the virtual block device are not immediately written to the
182 host's disk; this may cause problems if, for example, the User-Mode
183 Linux 'Virtual Machine' uses a journalling filesystem and the host
186 Synchronous operation (i.e. always writing data to the host's disk
187 immediately) is configurable on a per-UBD basis by using a special
188 kernel command line option. Alternatively, you can say Y here to
189 turn on synchronous operation by default for all block devices.
191 If you're running a journalling file system (like reiserfs, for
192 example) in your virtual machine, you will want to say Y here. If
193 you care for the safety of the data in your virtual machine, Y is a
194 wise choice too. In all other cases (for example, if you're just
195 playing around with User-Mode Linux) you can choose N.
197 config BLK_DEV_COW_COMMON
202 tristate "Loopback device support"
204 Saying Y here will allow you to use a regular file as a block
205 device; you can then create a file system on that block device and
206 mount it just as you would mount other block devices such as hard
207 drive partitions, CD-ROM drives or floppy drives. The loop devices
208 are block special device files with major number 7 and typically
209 called /dev/loop0, /dev/loop1 etc.
211 This is useful if you want to check an ISO 9660 file system before
212 burning the CD, or if you want to use floppy images without first
213 writing them to floppy. Furthermore, some Linux distributions avoid
214 the need for a dedicated Linux partition by keeping their complete
215 root file system inside a DOS FAT file using this loop device
218 To use the loop device, you need the losetup utility, found in the
219 util-linux package, see
220 <ftp://ftp.kernel.org/pub/linux/utils/util-linux/>.
222 The loop device driver can also be used to "hide" a file system in
223 a disk partition, floppy, or regular file, either using encryption
224 (scrambling the data) or steganography (hiding the data in the low
225 bits of, say, a sound file). This is also safe if the file resides
226 on a remote file server.
228 There are several ways of encrypting disks. Some of these require
229 kernel patches. The vanilla kernel offers the cryptoloop option
230 and a Device Mapper target (which is superior, as it supports all
231 file systems). If you want to use the cryptoloop, say Y to both
232 LOOP and CRYPTOLOOP, and make sure you have a recent (version 2.12
233 or later) version of util-linux. Additionally, be aware that
234 the cryptoloop is not safe for storing journaled filesystems.
236 Note that this loop device has nothing to do with the loopback
237 device used for network connections from the machine to itself.
239 To compile this driver as a module, choose M here: the
240 module will be called loop.
242 Most users will answer N here.
244 config BLK_DEV_LOOP_MIN_COUNT
245 int "Number of loop devices to pre-create at init time"
246 depends on BLK_DEV_LOOP
249 Static number of loop devices to be unconditionally pre-created
252 This default value can be overwritten on the kernel command
253 line or with module-parameter loop.max_loop.
255 The historic default is 8. If a late 2011 version of losetup(8)
256 is used, it can be set to 0, since needed loop devices can be
257 dynamically allocated with the /dev/loop-control interface.
259 config BLK_DEV_CRYPTOLOOP
260 tristate "Cryptoloop Support"
263 depends on BLK_DEV_LOOP
265 Say Y here if you want to be able to use the ciphers that are
266 provided by the CryptoAPI as loop transformation. This might be
267 used as hard disk encryption.
269 WARNING: This device is not safe for journaled file systems like
270 ext3 or Reiserfs. Please use the Device Mapper crypto module
271 instead, which can be configured to be on-disk compatible with the
274 source "drivers/block/drbd/Kconfig"
277 tristate "Network block device support"
280 Saying Y here will allow your computer to be a client for network
281 block devices, i.e. it will be able to use block devices exported by
282 servers (mount file systems on them etc.). Communication between
283 client and server works over TCP/IP networking, but to the client
284 program this is hidden: it looks like a regular local file access to
285 a block device special file such as /dev/nd0.
287 Network block devices also allows you to run a block-device in
288 userland (making server and client physically the same computer,
289 communicating using the loopback network device).
291 Read <file:Documentation/blockdev/nbd.txt> for more information,
292 especially about where to find the server code, which runs in user
293 space and does not need special kernel support.
295 Note that this has nothing to do with the network file systems NFS
296 or Coda; you can say N here even if you intend to use NFS or Coda.
298 To compile this driver as a module, choose M here: the
299 module will be called nbd.
304 tristate "STEC S1120 Block Driver"
308 Saying Y or M here will enable support for the
309 STEC, Inc. S1120 PCIe SSD.
311 Use device /dev/skd$N amd /dev/skd$Np$M.
314 tristate "OSD object-as-blkdev support"
315 depends on SCSI_OSD_ULD
317 Saying Y or M here will allow the exporting of a single SCSI
318 OSD (object-based storage) object as a Linux block device.
320 For example, if you create a 2G object on an OSD device,
321 you can then use this module to present that 2G object as
322 a Linux block device.
324 To compile this driver as a module, choose M here: the
325 module will be called osdblk.
330 tristate "Promise SATA SX8 support"
333 Saying Y or M here will enable support for the
334 Promise SATA SX8 controllers.
336 Use devices /dev/sx8/$N and /dev/sx8/$Np$M.
339 tristate "RAM block device support"
341 Saying Y here will allow you to use a portion of your RAM memory as
342 a block device, so that you can make file systems on it, read and
343 write to it and do all the other things that you can do with normal
344 block devices (such as hard drives). It is usually used to load and
345 store a copy of a minimal root file system off of a floppy into RAM
346 during the initial install of Linux.
348 Note that the kernel command line option "ramdisk=XX" is now obsolete.
349 For details, read <file:Documentation/blockdev/ramdisk.txt>.
351 To compile this driver as a module, choose M here: the
352 module will be called brd. An alias "rd" has been defined
353 for historical reasons.
355 Most normal users won't need the RAM disk functionality, and can
358 config BLK_DEV_RAM_COUNT
359 int "Default number of RAM disks"
361 depends on BLK_DEV_RAM
363 The default value is 16 RAM disks. Change this if you know what you
364 are doing. If you boot from a filesystem that needs to be extracted
365 in memory, you will need at least one RAM disk (e.g. root on cramfs).
367 config BLK_DEV_RAM_SIZE
368 int "Default RAM disk size (kbytes)"
369 depends on BLK_DEV_RAM
372 The default value is 4096 kilobytes. Only change this if you know
375 config BLK_DEV_RAM_DAX
376 bool "Support Direct Access (DAX) to RAM block devices"
377 depends on BLK_DEV_RAM && FS_DAX
380 Support filesystems using DAX to access RAM block devices. This
381 avoids double-buffering data in the page cache before copying it
382 to the block device. Answering Y will slightly enlarge the kernel,
383 and will prevent RAM block device backing store memory from being
384 allocated from highmem (only a problem for highmem systems).
387 tristate "Packet writing on CD/DVD media (DEPRECATED)"
390 Note: This driver is deprecated and will be removed from the
391 kernel in the near future!
393 If you have a CDROM/DVD drive that supports packet writing, say
394 Y to include support. It should work with any MMC/Mt Fuji
395 compliant ATAPI or SCSI drive, which is just about any newer
398 Currently only writing to CD-RW, DVD-RW, DVD+RW and DVDRAM discs
400 DVD-RW disks must be in restricted overwrite mode.
402 See the file <file:Documentation/cdrom/packet-writing.txt>
403 for further information on the use of this driver.
405 To compile this driver as a module, choose M here: the
406 module will be called pktcdvd.
408 config CDROM_PKTCDVD_BUFFERS
409 int "Free buffers for data gathering"
410 depends on CDROM_PKTCDVD
413 This controls the maximum number of active concurrent packets. More
414 concurrent packets can increase write performance, but also require
415 more memory. Each concurrent packet will require approximately 64Kb
416 of non-swappable kernel memory, memory which will be allocated when
417 a disc is opened for writing.
419 config CDROM_PKTCDVD_WCACHE
420 bool "Enable write caching"
421 depends on CDROM_PKTCDVD
423 If enabled, write caching will be set for the CD-R/W device. For now
424 this option is dangerous unless the CD-RW media is known good, as we
425 don't do deferred write error handling yet.
428 tristate "ATA over Ethernet support"
431 This driver provides Support for ATA over Ethernet block
432 devices like the Coraid EtherDrive (R) Storage Blade.
435 tristate "mGine mflash, gflash support"
436 depends on ARM && GPIOLIB
438 mGine mFlash(gFlash) block device driver
441 int "Size of reserved area before MBR"
445 Define size of reserved area that usually used for boot. Unit is KB.
446 All of the block device operation will be taken this value as start
452 tristate "Sun Virtual Disk Client support"
455 Support for virtual disk devices as a client under Sun
458 source "drivers/s390/block/Kconfig"
461 tristate "Xilinx SystemACE support"
462 depends on 4xx || MICROBLAZE
464 Include support for the Xilinx SystemACE CompactFlash interface
466 config XEN_BLKDEV_FRONTEND
467 tristate "Xen virtual block device support"
470 select XEN_XENBUS_FRONTEND
472 This driver implements the front-end of the Xen virtual
473 block device driver. It communicates with a back-end driver
474 in another domain which drives the actual block device.
476 config XEN_BLKDEV_BACKEND
477 tristate "Xen block-device backend driver"
478 depends on XEN_BACKEND
480 The block-device backend driver allows the kernel to export its
481 block devices to other guests via a high-performance shared-memory
484 The corresponding Linux frontend driver is enabled by the
485 CONFIG_XEN_BLKDEV_FRONTEND configuration option.
487 The backend driver attaches itself to a any block device specified
488 in the XenBus configuration. There are no limits to what the block
489 device as long as it has a major and minor.
491 If you are compiling a kernel to run in a Xen block backend driver
492 domain (often this is domain 0) you should say Y here. To
493 compile this driver as a module, chose M here: the module
494 will be called xen-blkback.
498 tristate "Virtio block driver"
501 This is the virtual block driver for virtio. It can be used with
502 lguest or QEMU based VMMs (like KVM or Xen). Say Y or M.
505 bool "Very old hard disk (MFM/RLL/IDE) driver"
507 depends on !ARM || ARCH_RPC || BROKEN
509 This is a very old hard disk driver that lacks the enhanced
510 functionality of the newer ones.
512 It is required for systems with ancient MFM/RLL/ESDI drives.
517 tristate "Rados block device (RBD)"
518 depends on INET && BLOCK
525 Say Y here if you want include the Rados block device, which stripes
526 a block device over objects stored in the Ceph distributed object
529 More information at http://ceph.newdream.net/.
534 tristate "IBM Flash Adapter 900GB Full Height PCIe Device Driver"
537 Device driver for IBM's high speed PCIe SSD
538 storage device: Flash Adapter 900GB Full Height.
540 To compile this driver as a module, choose M here: the
541 module will be called rsxx.