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+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Block device driver configuration
+#
+
+menuconfig MD
+ bool "Multiple devices driver support (RAID and LVM)"
+ depends on BLOCK
+ help
+ Support multiple physical spindles through a single logical device.
+ Required for RAID and logical volume management.
+
+if MD
+
+config BLK_DEV_MD
+ tristate "RAID support"
+ select BLOCK_HOLDER_DEPRECATED if SYSFS
+ select BUFFER_HEAD
+ # BLOCK_LEGACY_AUTOLOAD requirement should be removed
+ # after relevant mdadm enhancements - to make "names=yes"
+ # the default - are widely available.
+ select BLOCK_LEGACY_AUTOLOAD
+ help
+ This driver lets you combine several hard disk partitions into one
+ logical block device. This can be used to simply append one
+ partition to another one or to combine several redundant hard disks
+ into a RAID1/4/5 device so as to provide protection against hard
+ disk failures. This is called "Software RAID" since the combining of
+ the partitions is done by the kernel. "Hardware RAID" means that the
+ combining is done by a dedicated controller; if you have such a
+ controller, you do not need to say Y here.
+
+ More information about Software RAID on Linux is contained in the
+ Software RAID mini-HOWTO, available from
+ <https://www.tldp.org/docs.html#howto>. There you will also learn
+ where to get the supporting user space utilities raidtools.
+
+ If unsure, say N.
+
+config MD_AUTODETECT
+ bool "Autodetect RAID arrays during kernel boot"
+ depends on BLK_DEV_MD=y
+ default y
+ help
+ If you say Y here, then the kernel will try to autodetect raid
+ arrays as part of its boot process.
+
+ If you don't use raid and say Y, this autodetection can cause
+ a several-second delay in the boot time due to various
+ synchronisation steps that are part of this step.
+
+ If unsure, say Y.
+
+config MD_BITMAP_FILE
+ bool "MD bitmap file support (deprecated)"
+ default y
+ help
+ If you say Y here, support for write intent bitmaps in files on an
+ external file system is enabled. This is an alternative to the internal
+ bitmaps near the MD superblock, and very problematic code that abuses
+ various kernel APIs and can only work with files on a file system not
+ actually sitting on the MD device.
+
+config MD_LINEAR
+ tristate "Linear (append) mode (deprecated)"
+ depends on BLK_DEV_MD
+ help
+ If you say Y here, then your multiple devices driver will be able to
+ use the so-called linear mode, i.e. it will combine the hard disk
+ partitions by simply appending one to the other.
+
+ To compile this as a module, choose M here: the module
+ will be called linear.
+
+ If unsure, say Y.
+
+config MD_RAID0
+ tristate "RAID-0 (striping) mode"
+ depends on BLK_DEV_MD
+ help
+ If you say Y here, then your multiple devices driver will be able to
+ use the so-called raid0 mode, i.e. it will combine the hard disk
+ partitions into one logical device in such a fashion as to fill them
+ up evenly, one chunk here and one chunk there. This will increase
+ the throughput rate if the partitions reside on distinct disks.
+
+ Information about Software RAID on Linux is contained in the
+ Software-RAID mini-HOWTO, available from
+ <https://www.tldp.org/docs.html#howto>. There you will also
+ learn where to get the supporting user space utilities raidtools.
+
+ To compile this as a module, choose M here: the module
+ will be called raid0.
+
+ If unsure, say Y.
+
+config MD_RAID1
+ tristate "RAID-1 (mirroring) mode"
+ depends on BLK_DEV_MD
+ help
+ A RAID-1 set consists of several disk drives which are exact copies
+ of each other. In the event of a mirror failure, the RAID driver
+ will continue to use the operational mirrors in the set, providing
+ an error free MD (multiple device) to the higher levels of the
+ kernel. In a set with N drives, the available space is the capacity
+ of a single drive, and the set protects against a failure of (N - 1)
+ drives.
+
+ Information about Software RAID on Linux is contained in the
+ Software-RAID mini-HOWTO, available from
+ <https://www.tldp.org/docs.html#howto>. There you will also
+ learn where to get the supporting user space utilities raidtools.
+
+ If you want to use such a RAID-1 set, say Y. To compile this code
+ as a module, choose M here: the module will be called raid1.
+
+ If unsure, say Y.
+
+config MD_RAID10
+ tristate "RAID-10 (mirrored striping) mode"
+ depends on BLK_DEV_MD
+ help
+ RAID-10 provides a combination of striping (RAID-0) and
+ mirroring (RAID-1) with easier configuration and more flexible
+ layout.
+ Unlike RAID-0, but like RAID-1, RAID-10 requires all devices to
+ be the same size (or at least, only as much as the smallest device
+ will be used).
+ RAID-10 provides a variety of layouts that provide different levels
+ of redundancy and performance.
+
+ RAID-10 requires mdadm-1.7.0 or later, available at:
+
+ https://www.kernel.org/pub/linux/utils/raid/mdadm/
+
+ If unsure, say Y.
+
+config MD_RAID456
+ tristate "RAID-4/RAID-5/RAID-6 mode"
+ depends on BLK_DEV_MD
+ select RAID6_PQ
+ select LIBCRC32C
+ select ASYNC_MEMCPY
+ select ASYNC_XOR
+ select ASYNC_PQ
+ select ASYNC_RAID6_RECOV
+ help
+ A RAID-5 set of N drives with a capacity of C MB per drive provides
+ the capacity of C * (N - 1) MB, and protects against a failure
+ of a single drive. For a given sector (row) number, (N - 1) drives
+ contain data sectors, and one drive contains the parity protection.
+ For a RAID-4 set, the parity blocks are present on a single drive,
+ while a RAID-5 set distributes the parity across the drives in one
+ of the available parity distribution methods.
+
+ A RAID-6 set of N drives with a capacity of C MB per drive
+ provides the capacity of C * (N - 2) MB, and protects
+ against a failure of any two drives. For a given sector
+ (row) number, (N - 2) drives contain data sectors, and two
+ drives contains two independent redundancy syndromes. Like
+ RAID-5, RAID-6 distributes the syndromes across the drives
+ in one of the available parity distribution methods.
+
+ Information about Software RAID on Linux is contained in the
+ Software-RAID mini-HOWTO, available from
+ <https://www.tldp.org/docs.html#howto>. There you will also
+ learn where to get the supporting user space utilities raidtools.
+
+ If you want to use such a RAID-4/RAID-5/RAID-6 set, say Y. To
+ compile this code as a module, choose M here: the module
+ will be called raid456.
+
+ If unsure, say Y.
+
+config MD_MULTIPATH
+ tristate "Multipath I/O support (deprecated)"
+ depends on BLK_DEV_MD
+ help
+ MD_MULTIPATH provides a simple multi-path personality for use
+ the MD framework. It is not under active development. New
+ projects should consider using DM_MULTIPATH which has more
+ features and more testing.
+
+ If unsure, say N.
+
+config MD_FAULTY
+ tristate "Faulty test module for MD (deprecated)"
+ depends on BLK_DEV_MD
+ help
+ The "faulty" module allows for a block device that occasionally returns
+ read or write errors. It is useful for testing.
+
+ In unsure, say N.
+
+
+config MD_CLUSTER
+ tristate "Cluster Support for MD"
+ depends on BLK_DEV_MD
+ depends on DLM
+ default n
+ help
+ Clustering support for MD devices. This enables locking and
+ synchronization across multiple systems on the cluster, so all
+ nodes in the cluster can access the MD devices simultaneously.
+
+ This brings the redundancy (and uptime) of RAID levels across the
+ nodes of the cluster. Currently, it can work with raid1 and raid10
+ (limited support).
+
+ If unsure, say N.
+
+source "drivers/md/bcache/Kconfig"
+
+config BLK_DEV_DM_BUILTIN
+ bool
+
+config BLK_DEV_DM
+ tristate "Device mapper support"
+ select BLOCK_HOLDER_DEPRECATED if SYSFS
+ select BLK_DEV_DM_BUILTIN
+ select BLK_MQ_STACKING
+ depends on DAX || DAX=n
+ help
+ Device-mapper is a low level volume manager. It works by allowing
+ people to specify mappings for ranges of logical sectors. Various
+ mapping types are available, in addition people may write their own
+ modules containing custom mappings if they wish.
+
+ Higher level volume managers such as LVM2 use this driver.
+
+ To compile this as a module, choose M here: the module will be
+ called dm-mod.
+
+ If unsure, say N.
+
+config DM_DEBUG
+ bool "Device mapper debugging support"
+ depends on BLK_DEV_DM
+ help
+ Enable this for messages that may help debug device-mapper problems.
+
+ If unsure, say N.
+
+config DM_BUFIO
+ tristate
+ depends on BLK_DEV_DM
+ help
+ This interface allows you to do buffered I/O on a device and acts
+ as a cache, holding recently-read blocks in memory and performing
+ delayed writes.
+
+config DM_DEBUG_BLOCK_MANAGER_LOCKING
+ bool "Block manager locking"
+ depends on DM_BUFIO
+ help
+ Block manager locking can catch various metadata corruption issues.
+
+ If unsure, say N.
+
+config DM_DEBUG_BLOCK_STACK_TRACING
+ bool "Keep stack trace of persistent data block lock holders"
+ depends on STACKTRACE_SUPPORT && DM_DEBUG_BLOCK_MANAGER_LOCKING
+ select STACKTRACE
+ help
+ Enable this for messages that may help debug problems with the
+ block manager locking used by thin provisioning and caching.
+
+ If unsure, say N.
+
+config DM_BIO_PRISON
+ tristate
+ depends on BLK_DEV_DM
+ help
+ Some bio locking schemes used by other device-mapper targets
+ including thin provisioning.
+
+source "drivers/md/persistent-data/Kconfig"
+
+config DM_UNSTRIPED
+ tristate "Unstriped target"
+ depends on BLK_DEV_DM
+ help
+ Unstripes I/O so it is issued solely on a single drive in a HW
+ RAID0 or dm-striped target.
+
+config DM_CRYPT
+ tristate "Crypt target support"
+ depends on BLK_DEV_DM
+ depends on (ENCRYPTED_KEYS || ENCRYPTED_KEYS=n)
+ depends on (TRUSTED_KEYS || TRUSTED_KEYS=n)
+ select CRYPTO
+ select CRYPTO_CBC
+ select CRYPTO_ESSIV
+ help
+ This device-mapper target allows you to create a device that
+ transparently encrypts the data on it. You'll need to activate
+ the ciphers you're going to use in the cryptoapi configuration.
+
+ For further information on dm-crypt and userspace tools see:
+ <https://gitlab.com/cryptsetup/cryptsetup/wikis/DMCrypt>
+
+ To compile this code as a module, choose M here: the module will
+ be called dm-crypt.
+
+ If unsure, say N.
+
+config DM_SNAPSHOT
+ tristate "Snapshot target"
+ depends on BLK_DEV_DM
+ select DM_BUFIO
+ help
+ Allow volume managers to take writable snapshots of a device.
+
+config DM_THIN_PROVISIONING
+ tristate "Thin provisioning target"
+ depends on BLK_DEV_DM
+ select DM_PERSISTENT_DATA
+ select DM_BIO_PRISON
+ help
+ Provides thin provisioning and snapshots that share a data store.
+
+config DM_CACHE
+ tristate "Cache target (EXPERIMENTAL)"
+ depends on BLK_DEV_DM
+ default n
+ select DM_PERSISTENT_DATA
+ select DM_BIO_PRISON
+ help
+ dm-cache attempts to improve performance of a block device by
+ moving frequently used data to a smaller, higher performance
+ device. Different 'policy' plugins can be used to change the
+ algorithms used to select which blocks are promoted, demoted,
+ cleaned etc. It supports writeback and writethrough modes.
+
+config DM_CACHE_SMQ
+ tristate "Stochastic MQ Cache Policy (EXPERIMENTAL)"
+ depends on DM_CACHE
+ default y
+ help
+ A cache policy that uses a multiqueue ordered by recent hits
+ to select which blocks should be promoted and demoted.
+ This is meant to be a general purpose policy. It prioritises
+ reads over writes. This SMQ policy (vs MQ) offers the promise
+ of less memory utilization, improved performance and increased
+ adaptability in the face of changing workloads.
+
+config DM_WRITECACHE
+ tristate "Writecache target"
+ depends on BLK_DEV_DM
+ help
+ The writecache target caches writes on persistent memory or SSD.
+ It is intended for databases or other programs that need extremely
+ low commit latency.
+
+ The writecache target doesn't cache reads because reads are supposed
+ to be cached in standard RAM.
+
+config DM_EBS
+ tristate "Emulated block size target (EXPERIMENTAL)"
+ depends on BLK_DEV_DM && !HIGHMEM
+ select DM_BUFIO
+ help
+ dm-ebs emulates smaller logical block size on backing devices
+ with larger ones (e.g. 512 byte sectors on 4K native disks).
+
+config DM_ERA
+ tristate "Era target (EXPERIMENTAL)"
+ depends on BLK_DEV_DM
+ default n
+ select DM_PERSISTENT_DATA
+ select DM_BIO_PRISON
+ help
+ dm-era tracks which parts of a block device are written to
+ over time. Useful for maintaining cache coherency when using
+ vendor snapshots.
+
+config DM_CLONE
+ tristate "Clone target (EXPERIMENTAL)"
+ depends on BLK_DEV_DM
+ default n
+ select DM_PERSISTENT_DATA
+ help
+ dm-clone produces a one-to-one copy of an existing, read-only source
+ device into a writable destination device. The cloned device is
+ visible/mountable immediately and the copy of the source device to the
+ destination device happens in the background, in parallel with user
+ I/O.
+
+ If unsure, say N.
+
+config DM_MIRROR
+ tristate "Mirror target"
+ depends on BLK_DEV_DM
+ help
+ Allow volume managers to mirror logical volumes, also
+ needed for live data migration tools such as 'pvmove'.
+
+config DM_LOG_USERSPACE
+ tristate "Mirror userspace logging"
+ depends on DM_MIRROR && NET
+ select CONNECTOR
+ help
+ The userspace logging module provides a mechanism for
+ relaying the dm-dirty-log API to userspace. Log designs
+ which are more suited to userspace implementation (e.g.
+ shared storage logs) or experimental logs can be implemented
+ by leveraging this framework.
+
+config DM_RAID
+ tristate "RAID 1/4/5/6/10 target"
+ depends on BLK_DEV_DM
+ select MD_RAID0
+ select MD_RAID1
+ select MD_RAID10
+ select MD_RAID456
+ select BLK_DEV_MD
+ help
+ A dm target that supports RAID1, RAID10, RAID4, RAID5 and RAID6 mappings
+
+ A RAID-5 set of N drives with a capacity of C MB per drive provides
+ the capacity of C * (N - 1) MB, and protects against a failure
+ of a single drive. For a given sector (row) number, (N - 1) drives
+ contain data sectors, and one drive contains the parity protection.
+ For a RAID-4 set, the parity blocks are present on a single drive,
+ while a RAID-5 set distributes the parity across the drives in one
+ of the available parity distribution methods.
+
+ A RAID-6 set of N drives with a capacity of C MB per drive
+ provides the capacity of C * (N - 2) MB, and protects
+ against a failure of any two drives. For a given sector
+ (row) number, (N - 2) drives contain data sectors, and two
+ drives contains two independent redundancy syndromes. Like
+ RAID-5, RAID-6 distributes the syndromes across the drives
+ in one of the available parity distribution methods.
+
+config DM_ZERO
+ tristate "Zero target"
+ depends on BLK_DEV_DM
+ help
+ A target that discards writes, and returns all zeroes for
+ reads. Useful in some recovery situations.
+
+config DM_MULTIPATH
+ tristate "Multipath target"
+ depends on BLK_DEV_DM
+ # nasty syntax but means make DM_MULTIPATH independent
+ # of SCSI_DH if the latter isn't defined but if
+ # it is, DM_MULTIPATH must depend on it. We get a build
+ # error if SCSI_DH=m and DM_MULTIPATH=y
+ depends on !SCSI_DH || SCSI
+ help
+ Allow volume managers to support multipath hardware.
+
+config DM_MULTIPATH_QL
+ tristate "I/O Path Selector based on the number of in-flight I/Os"
+ depends on DM_MULTIPATH
+ help
+ This path selector is a dynamic load balancer which selects
+ the path with the least number of in-flight I/Os.
+
+ If unsure, say N.
+
+config DM_MULTIPATH_ST
+ tristate "I/O Path Selector based on the service time"
+ depends on DM_MULTIPATH
+ help
+ This path selector is a dynamic load balancer which selects
+ the path expected to complete the incoming I/O in the shortest
+ time.
+
+ If unsure, say N.
+
+config DM_MULTIPATH_HST
+ tristate "I/O Path Selector based on historical service time"
+ depends on DM_MULTIPATH
+ help
+ This path selector is a dynamic load balancer which selects
+ the path expected to complete the incoming I/O in the shortest
+ time by comparing estimated service time (based on historical
+ service time).
+
+ If unsure, say N.
+
+config DM_MULTIPATH_IOA
+ tristate "I/O Path Selector based on CPU submission"
+ depends on DM_MULTIPATH
+ help
+ This path selector selects the path based on the CPU the IO is
+ executed on and the CPU to path mapping setup at path addition time.
+
+ If unsure, say N.
+
+config DM_DELAY
+ tristate "I/O delaying target"
+ depends on BLK_DEV_DM
+ help
+ A target that delays reads and/or writes and can send
+ them to different devices. Useful for testing.
+
+ If unsure, say N.
+
+config DM_DUST
+ tristate "Bad sector simulation target"
+ depends on BLK_DEV_DM
+ help
+ A target that simulates bad sector behavior.
+ Useful for testing.
+
+ If unsure, say N.
+
+config DM_INIT
+ bool "DM \"dm-mod.create=\" parameter support"
+ depends on BLK_DEV_DM=y
+ help
+ Enable "dm-mod.create=" parameter to create mapped devices at init time.
+ This option is useful to allow mounting rootfs without requiring an
+ initramfs.
+ See Documentation/admin-guide/device-mapper/dm-init.rst for dm-mod.create="..."
+ format.
+
+ If unsure, say N.
+
+config DM_UEVENT
+ bool "DM uevents"
+ depends on BLK_DEV_DM
+ help
+ Generate udev events for DM events.
+
+config DM_FLAKEY
+ tristate "Flakey target"
+ depends on BLK_DEV_DM
+ help
+ A target that intermittently fails I/O for debugging purposes.
+
+config DM_VERITY
+ tristate "Verity target support"
+ depends on BLK_DEV_DM
+ select CRYPTO
+ select CRYPTO_HASH
+ select DM_BUFIO
+ help
+ This device-mapper target creates a read-only device that
+ transparently validates the data on one underlying device against
+ a pre-generated tree of cryptographic checksums stored on a second
+ device.
+
+ You'll need to activate the digests you're going to use in the
+ cryptoapi configuration.
+
+ To compile this code as a module, choose M here: the module will
+ be called dm-verity.
+
+ If unsure, say N.
+
+config DM_VERITY_VERIFY_ROOTHASH_SIG
+ def_bool n
+ bool "Verity data device root hash signature verification support"
+ depends on DM_VERITY
+ select SYSTEM_DATA_VERIFICATION
+ help
+ Add ability for dm-verity device to be validated if the
+ pre-generated tree of cryptographic checksums passed has a pkcs#7
+ signature file that can validate the roothash of the tree.
+
+ By default, rely on the builtin trusted keyring.
+
+ If unsure, say N.
+
+config DM_VERITY_VERIFY_ROOTHASH_SIG_SECONDARY_KEYRING
+ bool "Verity data device root hash signature verification with secondary keyring"
+ depends on DM_VERITY_VERIFY_ROOTHASH_SIG
+ depends on SECONDARY_TRUSTED_KEYRING
+ help
+ Rely on the secondary trusted keyring to verify dm-verity signatures.
+
+ If unsure, say N.
+
+config DM_VERITY_FEC
+ bool "Verity forward error correction support"
+ depends on DM_VERITY
+ select REED_SOLOMON
+ select REED_SOLOMON_DEC8
+ help
+ Add forward error correction support to dm-verity. This option
+ makes it possible to use pre-generated error correction data to
+ recover from corrupted blocks.
+
+ If unsure, say N.
+
+config DM_SWITCH
+ tristate "Switch target support (EXPERIMENTAL)"
+ depends on BLK_DEV_DM
+ help
+ This device-mapper target creates a device that supports an arbitrary
+ mapping of fixed-size regions of I/O across a fixed set of paths.
+ The path used for any specific region can be switched dynamically
+ by sending the target a message.
+
+ To compile this code as a module, choose M here: the module will
+ be called dm-switch.
+
+ If unsure, say N.
+
+config DM_LOG_WRITES
+ tristate "Log writes target support"
+ depends on BLK_DEV_DM
+ help
+ This device-mapper target takes two devices, one device to use
+ normally, one to log all write operations done to the first device.
+ This is for use by file system developers wishing to verify that
+ their fs is writing a consistent file system at all times by allowing
+ them to replay the log in a variety of ways and to check the
+ contents.
+
+ To compile this code as a module, choose M here: the module will
+ be called dm-log-writes.
+
+ If unsure, say N.
+
+config DM_INTEGRITY
+ tristate "Integrity target support"
+ depends on BLK_DEV_DM
+ select BLK_DEV_INTEGRITY
+ select DM_BUFIO
+ select CRYPTO
+ select CRYPTO_SKCIPHER
+ select ASYNC_XOR
+ select DM_AUDIT if AUDIT
+ help
+ This device-mapper target emulates a block device that has
+ additional per-sector tags that can be used for storing
+ integrity information.
+
+ This integrity target is used with the dm-crypt target to
+ provide authenticated disk encryption or it can be used
+ standalone.
+
+ To compile this code as a module, choose M here: the module will
+ be called dm-integrity.
+
+config DM_ZONED
+ tristate "Drive-managed zoned block device target support"
+ depends on BLK_DEV_DM
+ depends on BLK_DEV_ZONED
+ select CRC32
+ help
+ This device-mapper target takes a host-managed or host-aware zoned
+ block device and exposes most of its capacity as a regular block
+ device (drive-managed zoned block device) without any write
+ constraints. This is mainly intended for use with file systems that
+ do not natively support zoned block devices but still want to
+ benefit from the increased capacity offered by SMR disks. Other uses
+ by applications using raw block devices (for example object stores)
+ are also possible.
+
+ To compile this code as a module, choose M here: the module will
+ be called dm-zoned.
+
+ If unsure, say N.
+
+config DM_AUDIT
+ bool "DM audit events"
+ depends on BLK_DEV_DM
+ depends on AUDIT
+ help
+ Generate audit events for device-mapper.
+
+ Enables audit logging of several security relevant events in the
+ particular device-mapper targets, especially the integrity target.
+
+endif # MD