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Linux/block/Kconfig

  1 #
  2 # Block layer core configuration
  3 #
  4 menuconfig BLOCK
  5        bool "Enable the block layer" if EXPERT
  6        default y
  7        help
  8          Provide block layer support for the kernel.
  9 
 10          Disable this option to remove the block layer support from the
 11          kernel. This may be useful for embedded devices.
 12 
 13          If this option is disabled:
 14 
 15            - block device files will become unusable
 16            - some filesystems (such as ext3) will become unavailable.
 17 
 18          Also, SCSI character devices and USB storage will be disabled since
 19          they make use of various block layer definitions and facilities.
 20 
 21          Say Y here unless you know you really don't want to mount disks and
 22          suchlike.
 23 
 24 if BLOCK
 25 
 26 config LBDAF
 27         bool "Support for large (2TB+) block devices and files"
 28         depends on !64BIT
 29         default y
 30         help
 31           Enable block devices or files of size 2TB and larger.
 32 
 33           This option is required to support the full capacity of large
 34           (2TB+) block devices, including RAID, disk, Network Block Device,
 35           Logical Volume Manager (LVM) and loopback.
 36         
 37           This option also enables support for single files larger than
 38           2TB.
 39 
 40           The ext4 filesystem requires that this feature be enabled in
 41           order to support filesystems that have the huge_file feature
 42           enabled.  Otherwise, it will refuse to mount in the read-write
 43           mode any filesystems that use the huge_file feature, which is
 44           enabled by default by mke2fs.ext4.
 45 
 46           The GFS2 filesystem also requires this feature.
 47 
 48           If unsure, say Y.
 49 
 50 config BLK_DEV_BSG
 51         bool "Block layer SG support v4"
 52         default y
 53         help
 54           Saying Y here will enable generic SG (SCSI generic) v4 support
 55           for any block device.
 56 
 57           Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4
 58           can handle complicated SCSI commands: tagged variable length cdbs
 59           with bidirectional data transfers and generic request/response
 60           protocols (e.g. Task Management Functions and SMP in Serial
 61           Attached SCSI).
 62 
 63           This option is required by recent UDEV versions to properly
 64           access device serial numbers, etc.
 65 
 66           If unsure, say Y.
 67 
 68 config BLK_DEV_BSGLIB
 69         bool "Block layer SG support v4 helper lib"
 70         default n
 71         select BLK_DEV_BSG
 72         help
 73           Subsystems will normally enable this if needed. Users will not
 74           normally need to manually enable this.
 75 
 76           If unsure, say N.
 77 
 78 config BLK_DEV_INTEGRITY
 79         bool "Block layer data integrity support"
 80         select CRC_T10DIF if BLK_DEV_INTEGRITY
 81         ---help---
 82         Some storage devices allow extra information to be
 83         stored/retrieved to help protect the data.  The block layer
 84         data integrity option provides hooks which can be used by
 85         filesystems to ensure better data integrity.
 86 
 87         Say yes here if you have a storage device that provides the
 88         T10/SCSI Data Integrity Field or the T13/ATA External Path
 89         Protection.  If in doubt, say N.
 90 
 91 config BLK_DEV_DAX
 92         bool "Block device DAX support"
 93         depends on FS_DAX
 94         depends on BROKEN
 95         help
 96           When DAX support is available (CONFIG_FS_DAX) raw block
 97           devices can also support direct userspace access to the
 98           storage capacity via MMAP(2) similar to a file on a
 99           DAX-enabled filesystem.  However, the DAX I/O-path disables
100           some standard I/O-statistics, and the MMAP(2) path has some
101           operational differences due to bypassing the page
102           cache.  If in doubt, say N.
103 
104 config BLK_DEV_THROTTLING
105         bool "Block layer bio throttling support"
106         depends on BLK_CGROUP=y
107         default n
108         ---help---
109         Block layer bio throttling support. It can be used to limit
110         the IO rate to a device. IO rate policies are per cgroup and
111         one needs to mount and use blkio cgroup controller for creating
112         cgroups and specifying per device IO rate policies.
113 
114         See Documentation/cgroups/blkio-controller.txt for more information.
115 
116 config BLK_CMDLINE_PARSER
117         bool "Block device command line partition parser"
118         default n
119         ---help---
120         Enabling this option allows you to specify the partition layout from
121         the kernel boot args.  This is typically of use for embedded devices
122         which don't otherwise have any standardized method for listing the
123         partitions on a block device.
124 
125         See Documentation/block/cmdline-partition.txt for more information.
126 
127 menu "Partition Types"
128 
129 source "block/partitions/Kconfig"
130 
131 endmenu
132 
133 endif # BLOCK
134 
135 config BLOCK_COMPAT
136         bool
137         depends on BLOCK && COMPAT
138         default y
139 
140 source block/Kconfig.iosched

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