USB: use the no_callbacks flag for interfaces

[zen-stable.git] / drivers / block / Kconfig

#
# Block device driver configuration
#

menuconfig BLK_DEV
        bool "Block devices"
        depends on BLOCK
        default y
        ---help---
          Say Y here to get to see options for various different block device
          drivers. This option alone does not add any kernel code.

          If you say N, all options in this submenu will be skipped and disabled;
          only do this if you know what you are doing.

if BLK_DEV

config BLK_DEV_FD
        tristate "Normal floppy disk support"
        depends on ARCH_MAY_HAVE_PC_FDC
        ---help---
          If you want to use the floppy disk drive(s) of your PC under Linux,
          say Y. Information about this driver, especially important for IBM
          Thinkpad users, is contained in
          <file:Documentation/blockdev/floppy.txt>.
          That file also contains the location of the Floppy driver FAQ as
          well as location of the fdutils package used to configure additional
          parameters of the driver at run time.

          To compile this driver as a module, choose M here: the
          module will be called floppy.

config AMIGA_FLOPPY
        tristate "Amiga floppy support"
        depends on AMIGA

config ATARI_FLOPPY
        tristate "Atari floppy support"
        depends on ATARI

config MAC_FLOPPY
        tristate "Support for PowerMac floppy"
        depends on PPC_PMAC && !PPC_PMAC64
        help
          If you have a SWIM-3 (Super Woz Integrated Machine 3; from Apple)
          floppy controller, say Y here. Most commonly found in PowerMacs.

config BLK_DEV_SWIM
        tristate "Support for SWIM Macintosh floppy"
        depends on M68K && MAC
        help
          You should select this option if you want floppy support
          and you don't have a II, IIfx, Q900, Q950 or AV series.

config AMIGA_Z2RAM
        tristate "Amiga Zorro II ramdisk support"
        depends on ZORRO
        help
          This enables support for using Chip RAM and Zorro II RAM as a
          ramdisk or as a swap partition. Say Y if you want to include this
          driver in the kernel.

          To compile this driver as a module, choose M here: the
          module will be called z2ram.

config BLK_DEV_XD
        tristate "XT hard disk support"
        depends on ISA && ISA_DMA_API
        select CHECK_SIGNATURE
        help
          Very old 8 bit hard disk controllers used in the IBM XT computer
          will be supported if you say Y here.

          To compile this driver as a module, choose M here: the
          module will be called xd.

          It's pretty unlikely that you have one of these: say N.

config GDROM
        tristate "SEGA Dreamcast GD-ROM drive"
        depends on SH_DREAMCAST
        help
          A standard SEGA Dreamcast comes with a modified CD ROM drive called a
          "GD-ROM" by SEGA to signify it is capable of reading special disks
          with up to 1 GB of data. This drive will also read standard CD ROM
          disks. Select this option to access any disks in your GD ROM drive.
          Most users will want to say "Y" here.
          You can also build this as a module which will be called gdrom.

config PARIDE
        tristate "Parallel port IDE device support"
        depends on PARPORT_PC
        ---help---
          There are many external CD-ROM and disk devices that connect through
          your computer's parallel port. Most of them are actually IDE devices
          using a parallel port IDE adapter. This option enables the PARIDE
          subsystem which contains drivers for many of these external drives.
          Read <file:Documentation/blockdev/paride.txt> for more information.

          If you have said Y to the "Parallel-port support" configuration
          option, you may share a single port between your printer and other
          parallel port devices. Answer Y to build PARIDE support into your
          kernel, or M if you would like to build it as a loadable module. If
          your parallel port support is in a loadable module, you must build
          PARIDE as a module. If you built PARIDE support into your kernel,
          you may still build the individual protocol modules and high-level
          drivers as loadable modules. If you build this support as a module,
          it will be called paride.

          To use the PARIDE support, you must say Y or M here and also to at
          least one high-level driver (e.g. "Parallel port IDE disks",
          "Parallel port ATAPI CD-ROMs", "Parallel port ATAPI disks" etc.) and
          to at least one protocol driver (e.g. "ATEN EH-100 protocol",
          "MicroSolutions backpack protocol", "DataStor Commuter protocol"
          etc.).

source "drivers/block/paride/Kconfig"

config BLK_CPQ_DA
        tristate "Compaq SMART2 support"
        depends on PCI && VIRT_TO_BUS
        help
          This is the driver for Compaq Smart Array controllers.  Everyone
          using these boards should say Y here.  See the file
          <file:Documentation/blockdev/cpqarray.txt> for the current list of
          boards supported by this driver, and for further information on the
          use of this driver.

config BLK_CPQ_CISS_DA
        tristate "Compaq Smart Array 5xxx support"
        depends on PCI
        help
          This is the driver for Compaq Smart Array 5xxx controllers.
          Everyone using these boards should say Y here.
          See <file:Documentation/blockdev/cciss.txt> for the current list of
          boards supported by this driver, and for further information
          on the use of this driver.

config CISS_SCSI_TAPE
        bool "SCSI tape drive support for Smart Array 5xxx"
        depends on BLK_CPQ_CISS_DA && PROC_FS
        depends on SCSI=y || SCSI=BLK_CPQ_CISS_DA
        help
          When enabled (Y), this option allows SCSI tape drives and SCSI medium
          changers (tape robots) to be accessed via a Compaq 5xxx array 
          controller.  (See <file:Documentation/blockdev/cciss.txt> for more details.)

          "SCSI support" and "SCSI tape support" must also be enabled for this 
          option to work.

          When this option is disabled (N), the SCSI portion of the driver 
          is not compiled.

config BLK_DEV_DAC960
        tristate "Mylex DAC960/DAC1100 PCI RAID Controller support"
        depends on PCI
        help
          This driver adds support for the Mylex DAC960, AcceleRAID, and
          eXtremeRAID PCI RAID controllers.  See the file
          <file:Documentation/blockdev/README.DAC960> for further information
          about this driver.

          To compile this driver as a module, choose M here: the
          module will be called DAC960.

config BLK_DEV_UMEM
        tristate "Micro Memory MM5415 Battery Backed RAM support (EXPERIMENTAL)"
        depends on PCI && EXPERIMENTAL
        ---help---
          Saying Y here will include support for the MM5415 family of
          battery backed (Non-volatile) RAM cards.
          <http://www.umem.com/>

          The cards appear as block devices that can be partitioned into
          as many as 15 partitions.

          To compile this driver as a module, choose M here: the
          module will be called umem.

          The umem driver has not yet been allocated a MAJOR number, so
          one is chosen dynamically.

config BLK_DEV_UBD
        bool "Virtual block device"
        depends on UML
        ---help---
          The User-Mode Linux port includes a driver called UBD which will let
          you access arbitrary files on the host computer as block devices.
          Unless you know that you do not need such virtual block devices say
          Y here.

config BLK_DEV_UBD_SYNC
        bool "Always do synchronous disk IO for UBD"
        depends on BLK_DEV_UBD
        ---help---
          Writes to the virtual block device are not immediately written to the
          host's disk; this may cause problems if, for example, the User-Mode
          Linux 'Virtual Machine' uses a journalling filesystem and the host
          computer crashes.

          Synchronous operation (i.e. always writing data to the host's disk
          immediately) is configurable on a per-UBD basis by using a special
          kernel command line option.  Alternatively, you can say Y here to
          turn on synchronous operation by default for all block devices.

          If you're running a journalling file system (like reiserfs, for
          example) in your virtual machine, you will want to say Y here.  If
          you care for the safety of the data in your virtual machine, Y is a
          wise choice too.  In all other cases (for example, if you're just
          playing around with User-Mode Linux) you can choose N.

config BLK_DEV_COW_COMMON
        bool
        default BLK_DEV_UBD

config BLK_DEV_LOOP
        tristate "Loopback device support"
        ---help---
          Saying Y here will allow you to use a regular file as a block
          device; you can then create a file system on that block device and
          mount it just as you would mount other block devices such as hard
          drive partitions, CD-ROM drives or floppy drives. The loop devices
          are block special device files with major number 7 and typically
          called /dev/loop0, /dev/loop1 etc.

          This is useful if you want to check an ISO 9660 file system before
          burning the CD, or if you want to use floppy images without first
          writing them to floppy. Furthermore, some Linux distributions avoid
          the need for a dedicated Linux partition by keeping their complete
          root file system inside a DOS FAT file using this loop device
          driver.

          To use the loop device, you need the losetup utility, found in the
          util-linux package, see
          <ftp://ftp.kernel.org/pub/linux/utils/util-linux/>.

          The loop device driver can also be used to "hide" a file system in
          a disk partition, floppy, or regular file, either using encryption
          (scrambling the data) or steganography (hiding the data in the low
          bits of, say, a sound file). This is also safe if the file resides
          on a remote file server.

          There are several ways of encrypting disks. Some of these require
          kernel patches. The vanilla kernel offers the cryptoloop option
          and a Device Mapper target (which is superior, as it supports all
          file systems). If you want to use the cryptoloop, say Y to both
          LOOP and CRYPTOLOOP, and make sure you have a recent (version 2.12
          or later) version of util-linux. Additionally, be aware that
          the cryptoloop is not safe for storing journaled filesystems.

          Note that this loop device has nothing to do with the loopback
          device used for network connections from the machine to itself.

          To compile this driver as a module, choose M here: the
          module will be called loop.

          Most users will answer N here.

config BLK_DEV_CRYPTOLOOP
        tristate "Cryptoloop Support"
        select CRYPTO
        select CRYPTO_CBC
        depends on BLK_DEV_LOOP
        ---help---
          Say Y here if you want to be able to use the ciphers that are 
          provided by the CryptoAPI as loop transformation. This might be
          used as hard disk encryption.

          WARNING: This device is not safe for journaled file systems like
          ext3 or Reiserfs. Please use the Device Mapper crypto module
          instead, which can be configured to be on-disk compatible with the
          cryptoloop device.

source "drivers/block/drbd/Kconfig"

config BLK_DEV_NBD
        tristate "Network block device support"
        depends on NET
        ---help---
          Saying Y here will allow your computer to be a client for network
          block devices, i.e. it will be able to use block devices exported by
          servers (mount file systems on them etc.). Communication between
          client and server works over TCP/IP networking, but to the client
          program this is hidden: it looks like a regular local file access to
          a block device special file such as /dev/nd0.

          Network block devices also allows you to run a block-device in
          userland (making server and client physically the same computer,
          communicating using the loopback network device).

          Read <file:Documentation/blockdev/nbd.txt> for more information,
          especially about where to find the server code, which runs in user
          space and does not need special kernel support.

          Note that this has nothing to do with the network file systems NFS
          or Coda; you can say N here even if you intend to use NFS or Coda.

          To compile this driver as a module, choose M here: the
          module will be called nbd.

          If unsure, say N.

config BLK_DEV_OSD
        tristate "OSD object-as-blkdev support"
        depends on SCSI_OSD_ULD
        ---help---
          Saying Y or M here will allow the exporting of a single SCSI
          OSD (object-based storage) object as a Linux block device.

          For example, if you create a 2G object on an OSD device,
          you can then use this module to present that 2G object as
          a Linux block device.

          To compile this driver as a module, choose M here: the
          module will be called osdblk.

          If unsure, say N.

config BLK_DEV_SX8
        tristate "Promise SATA SX8 support"
        depends on PCI
        ---help---
          Saying Y or M here will enable support for the 
          Promise SATA SX8 controllers.

          Use devices /dev/sx8/$N and /dev/sx8/$Np$M.

config BLK_DEV_UB
        tristate "Low Performance USB Block driver"
        depends on USB
        help
          This driver supports certain USB attached storage devices
          such as flash keys.

          If you enable this driver, it is recommended to avoid conflicts
          with usb-storage by enabling USB_LIBUSUAL.

          If unsure, say N.

config BLK_DEV_RAM
        tristate "RAM block device support"
        ---help---
          Saying Y here will allow you to use a portion of your RAM memory as
          a block device, so that you can make file systems on it, read and
          write to it and do all the other things that you can do with normal
          block devices (such as hard drives). It is usually used to load and
          store a copy of a minimal root file system off of a floppy into RAM
          during the initial install of Linux.

          Note that the kernel command line option "ramdisk=XX" is now obsolete.
          For details, read <file:Documentation/blockdev/ramdisk.txt>.

          To compile this driver as a module, choose M here: the
          module will be called rd.

          Most normal users won't need the RAM disk functionality, and can
          thus say N here.

config BLK_DEV_RAM_COUNT
        int "Default number of RAM disks"
        default "16"
        depends on BLK_DEV_RAM
        help
          The default value is 16 RAM disks. Change this if you know what you
          are doing. If you boot from a filesystem that needs to be extracted
          in memory, you will need at least one RAM disk (e.g. root on cramfs).

config BLK_DEV_RAM_SIZE
        int "Default RAM disk size (kbytes)"
        depends on BLK_DEV_RAM
        default "4096"
        help
          The default value is 4096 kilobytes. Only change this if you know
          what you are doing.

config BLK_DEV_XIP
        bool "Support XIP filesystems on RAM block device"
        depends on BLK_DEV_RAM
        default n
        help
          Support XIP filesystems (such as ext2 with XIP support on) on
          top of block ram device. This will slightly enlarge the kernel, and
          will prevent RAM block device backing store memory from being
          allocated from highmem (only a problem for highmem systems).

config CDROM_PKTCDVD
        tristate "Packet writing on CD/DVD media"
        depends on !UML
        help
          If you have a CDROM/DVD drive that supports packet writing, say
          Y to include support. It should work with any MMC/Mt Fuji
          compliant ATAPI or SCSI drive, which is just about any newer
          DVD/CD writer.

          Currently only writing to CD-RW, DVD-RW, DVD+RW and DVDRAM discs
          is possible.
          DVD-RW disks must be in restricted overwrite mode.

          See the file <file:Documentation/cdrom/packet-writing.txt>
          for further information on the use of this driver.

          To compile this driver as a module, choose M here: the
          module will be called pktcdvd.

config CDROM_PKTCDVD_BUFFERS
        int "Free buffers for data gathering"
        depends on CDROM_PKTCDVD
        default "8"
        help
          This controls the maximum number of active concurrent packets. More
          concurrent packets can increase write performance, but also require
          more memory. Each concurrent packet will require approximately 64Kb
          of non-swappable kernel memory, memory which will be allocated when
          a disc is opened for writing.

config CDROM_PKTCDVD_WCACHE
        bool "Enable write caching (EXPERIMENTAL)"
        depends on CDROM_PKTCDVD && EXPERIMENTAL
        help
          If enabled, write caching will be set for the CD-R/W device. For now
          this option is dangerous unless the CD-RW media is known good, as we
          don't do deferred write error handling yet.

config ATA_OVER_ETH
        tristate "ATA over Ethernet support"
        depends on NET
        help
        This driver provides Support for ATA over Ethernet block
        devices like the Coraid EtherDrive (R) Storage Blade.

config MG_DISK
        tristate "mGine mflash, gflash support"
        depends on ARM && GPIOLIB
        help
          mGine mFlash(gFlash) block device driver

config MG_DISK_RES
        int "Size of reserved area before MBR"
        depends on MG_DISK
        default 0
        help
          Define size of reserved area that usually used for boot. Unit is KB.
          All of the block device operation will be taken this value as start
          offset
          Examples:
                        1024 => 1 MB

config SUNVDC
        tristate "Sun Virtual Disk Client support"
        depends on SUN_LDOMS
        help
          Support for virtual disk devices as a client under Sun
          Logical Domains.

source "drivers/s390/block/Kconfig"

config XILINX_SYSACE
        tristate "Xilinx SystemACE support"
        depends on 4xx || MICROBLAZE
        help
          Include support for the Xilinx SystemACE CompactFlash interface

config XEN_BLKDEV_FRONTEND
        tristate "Xen virtual block device support"
        depends on XEN
        default y
        help
          This driver implements the front-end of the Xen virtual
          block device driver.  It communicates with a back-end driver
          in another domain which drives the actual block device.

config VIRTIO_BLK
        tristate "Virtio block driver (EXPERIMENTAL)"
        depends on EXPERIMENTAL && VIRTIO
        ---help---
          This is the virtual block driver for virtio.  It can be used with
          lguest or QEMU based VMMs (like KVM or Xen).  Say Y or M.

config BLK_DEV_HD
        bool "Very old hard disk (MFM/RLL/IDE) driver"
        depends on HAVE_IDE
        depends on !ARM || ARCH_RPC || ARCH_SHARK || BROKEN
        help
          This is a very old hard disk driver that lacks the enhanced
          functionality of the newer ones.

          It is required for systems with ancient MFM/RLL/ESDI drives.

          If unsure, say N.

config BLK_DEV_RBD
        tristate "Rados block device (RBD)"
        depends on INET && EXPERIMENTAL && BLOCK
        select CEPH_LIB
        select LIBCRC32C
        select CRYPTO_AES
        select CRYPTO
        default n
        help
          Say Y here if you want include the Rados block device, which stripes
          a block device over objects stored in the Ceph distributed object
          store.

          More information at http://ceph.newdream.net/.

          If unsure, say N.

endif # BLK_DEV