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The V4 filesystem format contains known weaknesses in the on-disk format that make metadata verification diffiult. In addition, the format does not support dates past 2038 and will not be upgraded to do so. We should start the process of retiring the old format to close off attack surfaces and to encourage users to migrate onto V5. Therefore, make XFS V4 support a configurable option. For the first period it will be default Y in case some distributors want to withdraw support early; for the second period it will be default N so that anyone who wishes to continue support can do so; and after that, support will be removed from the kernel. Dates for these events have been added to the upstream kernel. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Eric Sandeen <sandeen@redhat.com>
168 lines
6.3 KiB
Plaintext
168 lines
6.3 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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config XFS_FS
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tristate "XFS filesystem support"
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depends on BLOCK
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select EXPORTFS
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select LIBCRC32C
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select FS_IOMAP
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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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config XFS_SUPPORT_V4
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bool "Support deprecated V4 (crc=0) format"
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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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config XFS_QUOTA
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bool "XFS Quota support"
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depends on XFS_FS
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select QUOTACTL
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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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bool "XFS POSIX ACL support"
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depends on XFS_FS
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select FS_POSIX_ACL
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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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config XFS_RT
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bool "XFS Realtime subvolume support"
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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 mount and use XFS filesystems
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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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See the xfs man page in section 5 for additional information.
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If unsure, say N.
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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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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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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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config XFS_DEBUG
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bool "XFS Debugging support"
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depends on XFS_FS
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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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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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