e1bc89bc99
Allocate memory for read-gathering at open time, when it is known just how much memory is needed. This avoids wasting kernel memory when the real packet size is smaller than the maximum packet size supported by the driver. This is always the case when using DVD discs. Signed-off-by: Peter Osterlund <petero2@telia.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
457 lines
17 KiB
Plaintext
457 lines
17 KiB
Plaintext
#
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# Block device driver configuration
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#
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menu "Block devices"
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config BLK_DEV_FD
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tristate "Normal floppy disk support"
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depends on ARCH_MAY_HAVE_PC_FDC
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---help---
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If you want to use the floppy disk drive(s) of your PC under Linux,
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say Y. Information about this driver, especially important for IBM
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Thinkpad users, is contained in <file:Documentation/floppy.txt>.
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That file also contains the location of the Floppy driver FAQ as
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well as location of the fdutils package used to configure additional
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parameters of the driver at run time.
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To compile this driver as a module, choose M here: the
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module will be called floppy.
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config AMIGA_FLOPPY
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tristate "Amiga floppy support"
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depends on AMIGA
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config ATARI_FLOPPY
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tristate "Atari floppy support"
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depends on ATARI
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config BLK_DEV_SWIM_IOP
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bool "Macintosh IIfx/Quadra 900/Quadra 950 floppy support (EXPERIMENTAL)"
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depends on MAC && EXPERIMENTAL && BROKEN
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help
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Say Y here to support the SWIM (Super Woz Integrated Machine) IOP
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floppy controller on the Macintosh IIfx and Quadra 900/950.
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config MAC_FLOPPY
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tristate "Support for PowerMac floppy"
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depends on PPC_PMAC && !PPC_PMAC64
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help
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If you have a SWIM-3 (Super Woz Integrated Machine 3; from Apple)
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floppy controller, say Y here. Most commonly found in PowerMacs.
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config BLK_DEV_PS2
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tristate "PS/2 ESDI hard disk support"
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depends on MCA && MCA_LEGACY && BROKEN
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help
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Say Y here if you have a PS/2 machine with a MCA bus and an ESDI
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hard disk.
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To compile this driver as a module, choose M here: the
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module will be called ps2esdi.
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config AMIGA_Z2RAM
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tristate "Amiga Zorro II ramdisk support"
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depends on ZORRO
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help
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This enables support for using Chip RAM and Zorro II RAM as a
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ramdisk or as a swap partition. Say Y if you want to include this
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driver in the kernel.
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To compile this driver as a module, choose M here: the
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module will be called z2ram.
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config ATARI_ACSI
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tristate "Atari ACSI support"
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depends on ATARI && BROKEN
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---help---
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This enables support for the Atari ACSI interface. The driver
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supports hard disks and CD-ROMs, which have 512-byte sectors, or can
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be switched to that mode. Due to the ACSI command format, only disks
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up to 1 GB are supported. Special support for certain ACSI to SCSI
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adapters, which could relax that, isn't included yet. The ACSI
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driver is also the basis for certain other drivers for devices
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attached to the ACSI bus: Atari SLM laser printer, BioNet-100
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Ethernet, and PAMsNet Ethernet. If you want to use one of these
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devices, you need ACSI support, too.
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To compile this driver as a module, choose M here: the
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module will be called acsi.
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comment "Some devices (e.g. CD jukebox) support multiple LUNs"
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depends on ATARI && ATARI_ACSI
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config ACSI_MULTI_LUN
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bool "Probe all LUNs on each ACSI device"
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depends on ATARI_ACSI
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help
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If you have a ACSI device that supports more than one LUN (Logical
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Unit Number), e.g. a CD jukebox, you should say Y here so that all
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will be found by the ACSI driver. An ACSI device with multiple LUNs
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acts logically like multiple ACSI devices. The vast majority of ACSI
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devices have only one LUN, and so most people can say N here and
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should in fact do so, because it is safer.
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config ATARI_SLM
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tristate "Atari SLM laser printer support"
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depends on ATARI && ATARI_ACSI!=n
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help
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If you have an Atari SLM laser printer, say Y to include support for
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it in the kernel. Otherwise, say N. This driver is also available as
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a module ( = code which can be inserted in and removed from the
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running kernel whenever you want). The module will be called
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acsi_slm. Be warned: the driver needs much ST-RAM and can cause
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problems due to that fact!
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config BLK_DEV_XD
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tristate "XT hard disk support"
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depends on ISA && ISA_DMA_API
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help
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Very old 8 bit hard disk controllers used in the IBM XT computer
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will be supported if you say Y here.
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To compile this driver as a module, choose M here: the
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module will be called xd.
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It's pretty unlikely that you have one of these: say N.
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config PARIDE
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tristate "Parallel port IDE device support"
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depends on PARPORT_PC
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---help---
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There are many external CD-ROM and disk devices that connect through
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your computer's parallel port. Most of them are actually IDE devices
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using a parallel port IDE adapter. This option enables the PARIDE
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subsystem which contains drivers for many of these external drives.
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Read <file:Documentation/paride.txt> for more information.
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If you have said Y to the "Parallel-port support" configuration
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option, you may share a single port between your printer and other
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parallel port devices. Answer Y to build PARIDE support into your
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kernel, or M if you would like to build it as a loadable module. If
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your parallel port support is in a loadable module, you must build
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PARIDE as a module. If you built PARIDE support into your kernel,
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you may still build the individual protocol modules and high-level
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drivers as loadable modules. If you build this support as a module,
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it will be called paride.
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To use the PARIDE support, you must say Y or M here and also to at
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least one high-level driver (e.g. "Parallel port IDE disks",
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"Parallel port ATAPI CD-ROMs", "Parallel port ATAPI disks" etc.) and
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to at least one protocol driver (e.g. "ATEN EH-100 protocol",
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"MicroSolutions backpack protocol", "DataStor Commuter protocol"
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etc.).
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source "drivers/block/paride/Kconfig"
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config BLK_CPQ_DA
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tristate "Compaq SMART2 support"
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depends on PCI
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help
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This is the driver for Compaq Smart Array controllers. Everyone
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using these boards should say Y here. See the file
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<file:Documentation/cpqarray.txt> for the current list of boards
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supported by this driver, and for further information on the use of
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this driver.
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config BLK_CPQ_CISS_DA
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tristate "Compaq Smart Array 5xxx support"
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depends on PCI
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help
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This is the driver for Compaq Smart Array 5xxx controllers.
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Everyone using these boards should say Y here.
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See <file:Documentation/cciss.txt> for the current list of
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boards supported by this driver, and for further information
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on the use of this driver.
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config CISS_SCSI_TAPE
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bool "SCSI tape drive support for Smart Array 5xxx"
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depends on BLK_CPQ_CISS_DA && SCSI && PROC_FS
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help
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When enabled (Y), this option allows SCSI tape drives and SCSI medium
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changers (tape robots) to be accessed via a Compaq 5xxx array
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controller. (See <file:Documentation/cciss.txt> for more details.)
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"SCSI support" and "SCSI tape support" must also be enabled for this
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option to work.
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When this option is disabled (N), the SCSI portion of the driver
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is not compiled.
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config BLK_DEV_DAC960
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tristate "Mylex DAC960/DAC1100 PCI RAID Controller support"
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depends on PCI
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help
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This driver adds support for the Mylex DAC960, AcceleRAID, and
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eXtremeRAID PCI RAID controllers. See the file
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<file:Documentation/README.DAC960> for further information about
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this driver.
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To compile this driver as a module, choose M here: the
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module will be called DAC960.
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config BLK_DEV_UMEM
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tristate "Micro Memory MM5415 Battery Backed RAM support (EXPERIMENTAL)"
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depends on PCI && EXPERIMENTAL
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---help---
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Saying Y here will include support for the MM5415 family of
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battery backed (Non-volatile) RAM cards.
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<http://www.umem.com/>
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The cards appear as block devices that can be partitioned into
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as many as 15 partitions.
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To compile this driver as a module, choose M here: the
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module will be called umem.
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The umem driver has not yet been allocated a MAJOR number, so
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one is chosen dynamically. Use "devfs" or look in /proc/devices
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for the device number
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config BLK_DEV_UBD
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bool "Virtual block device"
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depends on UML
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---help---
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The User-Mode Linux port includes a driver called UBD which will let
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you access arbitrary files on the host computer as block devices.
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Unless you know that you do not need such virtual block devices say
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Y here.
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config BLK_DEV_UBD_SYNC
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bool "Always do synchronous disk IO for UBD"
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depends on BLK_DEV_UBD
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---help---
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Writes to the virtual block device are not immediately written to the
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host's disk; this may cause problems if, for example, the User-Mode
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Linux 'Virtual Machine' uses a journalling filesystem and the host
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computer crashes.
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Synchronous operation (i.e. always writing data to the host's disk
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immediately) is configurable on a per-UBD basis by using a special
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kernel command line option. Alternatively, you can say Y here to
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turn on synchronous operation by default for all block devices.
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If you're running a journalling file system (like reiserfs, for
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example) in your virtual machine, you will want to say Y here. If
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you care for the safety of the data in your virtual machine, Y is a
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wise choice too. In all other cases (for example, if you're just
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playing around with User-Mode Linux) you can choose N.
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config BLK_DEV_COW_COMMON
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bool
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default BLK_DEV_UBD
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config MMAPPER
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tristate "Example IO memory driver (BROKEN)"
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depends on UML && BROKEN
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---help---
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The User-Mode Linux port can provide support for IO Memory
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emulation with this option. This allows a host file to be
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specified as an I/O region on the kernel command line. That file
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will be mapped into UML's kernel address space where a driver can
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locate it and do whatever it wants with the memory, including
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providing an interface to it for UML processes to use.
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For more information, see
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<http://user-mode-linux.sourceforge.net/iomem.html>.
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If you'd like to be able to provide a simulated IO port space for
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User-Mode Linux processes, say Y. If unsure, say N.
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config BLK_DEV_LOOP
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tristate "Loopback device support"
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---help---
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Saying Y here will allow you to use a regular file as a block
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device; you can then create a file system on that block device and
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mount it just as you would mount other block devices such as hard
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drive partitions, CD-ROM drives or floppy drives. The loop devices
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are block special device files with major number 7 and typically
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called /dev/loop0, /dev/loop1 etc.
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This is useful if you want to check an ISO 9660 file system before
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burning the CD, or if you want to use floppy images without first
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writing them to floppy. Furthermore, some Linux distributions avoid
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the need for a dedicated Linux partition by keeping their complete
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root file system inside a DOS FAT file using this loop device
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driver.
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To use the loop device, you need the losetup utility, found in the
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util-linux package, see
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<ftp://ftp.kernel.org/pub/linux/utils/util-linux/>.
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The loop device driver can also be used to "hide" a file system in
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a disk partition, floppy, or regular file, either using encryption
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(scrambling the data) or steganography (hiding the data in the low
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bits of, say, a sound file). This is also safe if the file resides
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on a remote file server.
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There are several ways of encrypting disks. Some of these require
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kernel patches. The vanilla kernel offers the cryptoloop option
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and a Device Mapper target (which is superior, as it supports all
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file systems). If you want to use the cryptoloop, say Y to both
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LOOP and CRYPTOLOOP, and make sure you have a recent (version 2.12
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or later) version of util-linux. Additionally, be aware that
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the cryptoloop is not safe for storing journaled filesystems.
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Note that this loop device has nothing to do with the loopback
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device used for network connections from the machine to itself.
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To compile this driver as a module, choose M here: the
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module will be called loop.
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Most users will answer N here.
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config BLK_DEV_CRYPTOLOOP
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tristate "Cryptoloop Support"
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select CRYPTO
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depends on BLK_DEV_LOOP
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---help---
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Say Y here if you want to be able to use the ciphers that are
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provided by the CryptoAPI as loop transformation. This might be
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used as hard disk encryption.
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WARNING: This device is not safe for journaled file systems like
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ext3 or Reiserfs. Please use the Device Mapper crypto module
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instead, which can be configured to be on-disk compatible with the
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cryptoloop device.
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config BLK_DEV_NBD
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tristate "Network block device support"
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depends on NET
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---help---
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Saying Y here will allow your computer to be a client for network
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block devices, i.e. it will be able to use block devices exported by
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servers (mount file systems on them etc.). Communication between
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client and server works over TCP/IP networking, but to the client
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program this is hidden: it looks like a regular local file access to
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a block device special file such as /dev/nd0.
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Network block devices also allows you to run a block-device in
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userland (making server and client physically the same computer,
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communicating using the loopback network device).
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Read <file:Documentation/nbd.txt> for more information, especially
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about where to find the server code, which runs in user space and
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does not need special kernel support.
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Note that this has nothing to do with the network file systems NFS
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or Coda; you can say N here even if you intend to use NFS or Coda.
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To compile this driver as a module, choose M here: the
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module will be called nbd.
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If unsure, say N.
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config BLK_DEV_SX8
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tristate "Promise SATA SX8 support"
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depends on PCI
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---help---
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Saying Y or M here will enable support for the
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Promise SATA SX8 controllers.
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Use devices /dev/sx8/$N and /dev/sx8/$Np$M.
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config BLK_DEV_UB
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tristate "Low Performance USB Block driver"
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depends on USB
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help
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This driver supports certain USB attached storage devices
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such as flash keys.
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If you enable this driver, it is recommended to avoid conflicts
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with usb-storage by enabling USB_LIBUSUAL.
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If unsure, say N.
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config BLK_DEV_RAM
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tristate "RAM disk support"
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---help---
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Saying Y here will allow you to use a portion of your RAM memory as
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a block device, so that you can make file systems on it, read and
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write to it and do all the other things that you can do with normal
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block devices (such as hard drives). It is usually used to load and
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store a copy of a minimal root file system off of a floppy into RAM
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during the initial install of Linux.
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Note that the kernel command line option "ramdisk=XX" is now
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obsolete. For details, read <file:Documentation/ramdisk.txt>.
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To compile this driver as a module, choose M here: the
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module will be called rd.
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Most normal users won't need the RAM disk functionality, and can
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thus say N here.
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config BLK_DEV_RAM_COUNT
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int "Default number of RAM disks" if BLK_DEV_RAM
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default "16"
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help
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The default value is 16 RAM disks. Change this if you know what
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are doing. If you boot from a filesystem that needs to be extracted
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in memory, you will need at least one RAM disk (e.g. root on cramfs).
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config BLK_DEV_RAM_SIZE
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int "Default RAM disk size (kbytes)"
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depends on BLK_DEV_RAM
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default "4096"
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help
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The default value is 4096 kilobytes. Only change this if you know
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what are you doing. If you are using IBM S/390, then set this to
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8192.
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config BLK_DEV_INITRD
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bool "Initial RAM disk (initrd) support"
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depends on BLK_DEV_RAM=y
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help
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The initial RAM disk is a RAM disk that is loaded by the boot loader
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(loadlin or lilo) and that is mounted as root before the normal boot
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procedure. It is typically used to load modules needed to mount the
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"real" root file system, etc. See <file:Documentation/initrd.txt>
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for details.
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config CDROM_PKTCDVD
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tristate "Packet writing on CD/DVD media"
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depends on !UML
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help
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If you have a CDROM drive that supports packet writing, say Y to
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include preliminary support. It should work with any MMC/Mt Fuji
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compliant ATAPI or SCSI drive, which is just about any newer CD
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writer.
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Currently only writing to CD-RW, DVD-RW and DVD+RW discs is possible.
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DVD-RW disks must be in restricted overwrite mode.
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To compile this driver as a module, choose M here: the
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module will be called pktcdvd.
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config CDROM_PKTCDVD_BUFFERS
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int "Free buffers for data gathering"
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depends on CDROM_PKTCDVD
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default "8"
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help
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This controls the maximum number of active concurrent packets. More
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concurrent packets can increase write performance, but also require
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more memory. Each concurrent packet will require approximately 64Kb
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of non-swappable kernel memory, memory which will be allocated when
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a disc is opened for writing.
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config CDROM_PKTCDVD_WCACHE
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bool "Enable write caching (EXPERIMENTAL)"
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depends on CDROM_PKTCDVD && EXPERIMENTAL
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help
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If enabled, write caching will be set for the CD-R/W device. For now
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this option is dangerous unless the CD-RW media is known good, as we
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don't do deferred write error handling yet.
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source "drivers/s390/block/Kconfig"
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config ATA_OVER_ETH
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tristate "ATA over Ethernet support"
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depends on NET
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help
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This driver provides Support for ATA over Ethernet block
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devices like the Coraid EtherDrive (R) Storage Blade.
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endmenu
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