2019-05-19 20:07:45 +08:00
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# SPDX-License-Identifier: GPL-2.0-only
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2005-04-17 06:20:36 +08:00
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config XFS_FS
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tristate "XFS filesystem support"
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[PATCH] BLOCK: Make it possible to disable the block layer [try #6]
Make it possible to disable the block layer. Not all embedded devices require
it, some can make do with just JFFS2, NFS, ramfs, etc - none of which require
the block layer to be present.
This patch does the following:
(*) Introduces CONFIG_BLOCK to disable the block layer, buffering and blockdev
support.
(*) Adds dependencies on CONFIG_BLOCK to any configuration item that controls
an item that uses the block layer. This includes:
(*) Block I/O tracing.
(*) Disk partition code.
(*) All filesystems that are block based, eg: Ext3, ReiserFS, ISOFS.
(*) The SCSI layer. As far as I can tell, even SCSI chardevs use the
block layer to do scheduling. Some drivers that use SCSI facilities -
such as USB storage - end up disabled indirectly from this.
(*) Various block-based device drivers, such as IDE and the old CDROM
drivers.
(*) MTD blockdev handling and FTL.
(*) JFFS - which uses set_bdev_super(), something it could avoid doing by
taking a leaf out of JFFS2's book.
(*) Makes most of the contents of linux/blkdev.h, linux/buffer_head.h and
linux/elevator.h contingent on CONFIG_BLOCK being set. sector_div() is,
however, still used in places, and so is still available.
(*) Also made contingent are the contents of linux/mpage.h, linux/genhd.h and
parts of linux/fs.h.
(*) Makes a number of files in fs/ contingent on CONFIG_BLOCK.
(*) Makes mm/bounce.c (bounce buffering) contingent on CONFIG_BLOCK.
(*) set_page_dirty() doesn't call __set_page_dirty_buffers() if CONFIG_BLOCK
is not enabled.
(*) fs/no-block.c is created to hold out-of-line stubs and things that are
required when CONFIG_BLOCK is not set:
(*) Default blockdev file operations (to give error ENODEV on opening).
(*) Makes some /proc changes:
(*) /proc/devices does not list any blockdevs.
(*) /proc/diskstats and /proc/partitions are contingent on CONFIG_BLOCK.
(*) Makes some compat ioctl handling contingent on CONFIG_BLOCK.
(*) If CONFIG_BLOCK is not defined, makes sys_quotactl() return -ENODEV if
given command other than Q_SYNC or if a special device is specified.
(*) In init/do_mounts.c, no reference is made to the blockdev routines if
CONFIG_BLOCK is not defined. This does not prohibit NFS roots or JFFS2.
(*) The bdflush, ioprio_set and ioprio_get syscalls can now be absent (return
error ENOSYS by way of cond_syscall if so).
(*) The seclvl_bd_claim() and seclvl_bd_release() security calls do nothing if
CONFIG_BLOCK is not set, since they can't then happen.
Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2006-10-01 02:45:40 +08:00
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depends on BLOCK
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2009-01-19 09:02:57 +08:00
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select EXPORTFS
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2012-11-16 06:20:37 +08:00
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select LIBCRC32C
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2016-06-21 07:53:44 +08:00
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select FS_IOMAP
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2005-04-17 06:20:36 +08:00
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help
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XFS is a high performance journaling filesystem which originated
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on the SGI IRIX platform. It is completely multi-threaded, can
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support large files and large filesystems, extended attributes,
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variable block sizes, is extent based, and makes extensive use of
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Btrees (directories, extents, free space) to aid both performance
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and scalability.
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Refer to the documentation at <http://oss.sgi.com/projects/xfs/>
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for complete details. This implementation is on-disk compatible
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with the IRIX version of XFS.
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To compile this file system support as a module, choose M here: the
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module will be called xfs. Be aware, however, that if the file
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system of your root partition is compiled as a module, you'll need
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to use an initial ramdisk (initrd) to boot.
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2020-09-11 01:57:17 +08:00
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config XFS_SUPPORT_V4
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bool "Support deprecated V4 (crc=0) format"
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2020-10-13 05:10:03 +08:00
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depends on XFS_FS
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2020-09-11 01:57:17 +08:00
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default y
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help
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The V4 filesystem format lacks certain features that are supported
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by the V5 format, such as metadata checksumming, strengthened
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metadata verification, and the ability to store timestamps past the
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year 2038. Because of this, the V4 format is deprecated. All users
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should upgrade by backing up their files, reformatting, and restoring
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from the backup.
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Administrators and users can detect a V4 filesystem by running
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xfs_info against a filesystem mountpoint and checking for a string
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beginning with "crc=". If the string "crc=0" is found, the
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filesystem is a V4 filesystem. If no such string is found, please
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upgrade xfsprogs to the latest version and try again.
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This option will become default N in September 2025. Support for the
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V4 format will be removed entirely in September 2030. Distributors
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can say N here to withdraw support earlier.
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To continue supporting the old V4 format (crc=0), say Y.
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To close off an attack surface, say N.
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2005-04-17 06:20:36 +08:00
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config XFS_QUOTA
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2005-11-03 10:55:06 +08:00
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bool "XFS Quota support"
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2005-04-17 06:20:36 +08:00
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depends on XFS_FS
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2010-08-17 18:14:44 +08:00
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select QUOTACTL
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2005-04-17 06:20:36 +08:00
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help
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If you say Y here, you will be able to set limits for disk usage on
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a per user and/or a per group basis under XFS. XFS considers quota
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information as filesystem metadata and uses journaling to provide a
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higher level guarantee of consistency. The on-disk data format for
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quota is also compatible with the IRIX version of XFS, allowing a
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filesystem to be migrated between Linux and IRIX without any need
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for conversion.
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If unsure, say N. More comprehensive documentation can be found in
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README.quota in the xfsprogs package. XFS quota can be used either
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with or without the generic quota support enabled (CONFIG_QUOTA) -
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they are completely independent subsystems.
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config XFS_POSIX_ACL
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2005-09-08 13:34:58 +08:00
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bool "XFS POSIX ACL support"
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2005-04-17 06:20:36 +08:00
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depends on XFS_FS
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2009-06-10 23:07:47 +08:00
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select FS_POSIX_ACL
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2005-04-17 06:20:36 +08:00
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help
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POSIX Access Control Lists (ACLs) support permissions for users and
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groups beyond the owner/group/world scheme.
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If you don't know what Access Control Lists are, say N.
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2005-09-08 13:34:58 +08:00
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config XFS_RT
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2006-06-13 14:28:11 +08:00
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bool "XFS Realtime subvolume support"
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depends on XFS_FS
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2005-09-08 13:34:58 +08:00
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help
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If you say Y here you will be able to mount and use XFS filesystems
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2006-06-13 14:28:11 +08:00
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which contain a realtime subvolume. The realtime subvolume is a
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separate area of disk space where only file data is stored. It was
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originally designed to provide deterministic data rates suitable
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for media streaming applications, but is also useful as a generic
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mechanism for ensuring data and metadata/log I/Os are completely
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separated. Regular file I/Os are isolated to a separate device
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from all other requests, and this can be done quite transparently
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to applications via the inherit-realtime directory inode flag.
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2005-09-08 13:34:58 +08:00
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2006-06-13 14:28:11 +08:00
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See the xfs man page in section 5 for additional information.
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2005-09-08 13:34:58 +08:00
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If unsure, say N.
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2008-04-21 15:22:27 +08:00
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2017-10-18 12:37:34 +08:00
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config XFS_ONLINE_SCRUB
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bool "XFS online metadata check support"
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default n
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depends on XFS_FS
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help
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If you say Y here you will be able to check metadata on a
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mounted XFS filesystem. This feature is intended to reduce
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filesystem downtime by supplementing xfs_repair. The key
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advantage here is to look for problems proactively so that
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they can be dealt with in a controlled manner.
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This feature is considered EXPERIMENTAL. Use with caution!
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See the xfs_scrub man page in section 8 for additional information.
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If unsure, say N.
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2018-05-14 21:34:36 +08:00
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config XFS_ONLINE_REPAIR
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bool "XFS online metadata repair support"
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default n
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depends on XFS_FS && XFS_ONLINE_SCRUB
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help
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If you say Y here you will be able to repair metadata on a
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mounted XFS filesystem. This feature is intended to reduce
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filesystem downtime by fixing minor problems before they cause the
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filesystem to go down. However, it requires that the filesystem be
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formatted with secondary metadata, such as reverse mappings and inode
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parent pointers.
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This feature is considered EXPERIMENTAL. Use with caution!
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See the xfs_scrub man page in section 8 for additional information.
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If unsure, say N.
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2013-04-30 19:39:34 +08:00
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config XFS_WARN
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bool "XFS Verbose Warnings"
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depends on XFS_FS && !XFS_DEBUG
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help
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Say Y here to get an XFS build with many additional warnings.
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It converts ASSERT checks to WARN, so will log any out-of-bounds
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conditions that occur that would otherwise be missed. It is much
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lighter weight than XFS_DEBUG and does not modify algorithms and will
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not cause the kernel to panic on non-fatal errors.
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However, similar to XFS_DEBUG, it is only advisable to use this if you
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are debugging a particular problem.
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2008-04-21 15:22:27 +08:00
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config XFS_DEBUG
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2012-10-03 02:19:27 +08:00
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bool "XFS Debugging support"
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depends on XFS_FS
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2008-04-21 15:22:27 +08:00
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help
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Say Y here to get an XFS build with many debugging features,
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including ASSERT checks, function wrappers around macros,
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and extra sanity-checking functions in various code paths.
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Note that the resulting code will be HUGE and SLOW, and probably
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not useful unless you are debugging a particular problem.
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Say N unless you are an XFS developer, or you play one on TV.
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2017-06-15 12:29:13 +08:00
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config XFS_ASSERT_FATAL
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bool "XFS fatal asserts"
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default y
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depends on XFS_FS && XFS_DEBUG
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help
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Set the default DEBUG mode ASSERT failure behavior.
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Say Y here to cause DEBUG mode ASSERT failures to result in fatal
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errors that BUG() the kernel by default. If you say N, ASSERT failures
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result in warnings.
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This behavior can be modified at runtime via sysfs.
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