1 # SPDX-License-Identifier: GPL-2.0-only
3 tristate "XFS filesystem support"
9 XFS is a high performance journaling filesystem which originated
10 on the SGI IRIX platform. It is completely multi-threaded, can
11 support large files and large filesystems, extended attributes,
12 variable block sizes, is extent based, and makes extensive use of
13 Btrees (directories, extents, free space) to aid both performance
16 Refer to the documentation at <http://oss.sgi.com/projects/xfs/>
17 for complete details. This implementation is on-disk compatible
18 with the IRIX version of XFS.
20 To compile this file system support as a module, choose M here: the
21 module will be called xfs. Be aware, however, that if the file
22 system of your root partition is compiled as a module, you'll need
23 to use an initial ramdisk (initrd) to boot.
26 bool "Support deprecated V4 (crc=0) format"
30 The V4 filesystem format lacks certain features that are supported
31 by the V5 format, such as metadata checksumming, strengthened
32 metadata verification, and the ability to store timestamps past the
33 year 2038. Because of this, the V4 format is deprecated. All users
34 should upgrade by backing up their files, reformatting, and restoring
37 Administrators and users can detect a V4 filesystem by running
38 xfs_info against a filesystem mountpoint and checking for a string
39 beginning with "crc=". If the string "crc=0" is found, the
40 filesystem is a V4 filesystem. If no such string is found, please
41 upgrade xfsprogs to the latest version and try again.
43 This option will become default N in September 2025. Support for the
44 V4 format will be removed entirely in September 2030. Distributors
45 can say N here to withdraw support earlier.
47 To continue supporting the old V4 format (crc=0), say Y.
48 To close off an attack surface, say N.
51 bool "XFS Quota support"
55 If you say Y here, you will be able to set limits for disk usage on
56 a per user and/or a per group basis under XFS. XFS considers quota
57 information as filesystem metadata and uses journaling to provide a
58 higher level guarantee of consistency. The on-disk data format for
59 quota is also compatible with the IRIX version of XFS, allowing a
60 filesystem to be migrated between Linux and IRIX without any need
63 If unsure, say N. More comprehensive documentation can be found in
64 README.quota in the xfsprogs package. XFS quota can be used either
65 with or without the generic quota support enabled (CONFIG_QUOTA) -
66 they are completely independent subsystems.
69 bool "XFS POSIX ACL support"
73 POSIX Access Control Lists (ACLs) support permissions for users and
74 groups beyond the owner/group/world scheme.
76 If you don't know what Access Control Lists are, say N.
79 bool "XFS Realtime subvolume support"
82 If you say Y here you will be able to mount and use XFS filesystems
83 which contain a realtime subvolume. The realtime subvolume is a
84 separate area of disk space where only file data is stored. It was
85 originally designed to provide deterministic data rates suitable
86 for media streaming applications, but is also useful as a generic
87 mechanism for ensuring data and metadata/log I/Os are completely
88 separated. Regular file I/Os are isolated to a separate device
89 from all other requests, and this can be done quite transparently
90 to applications via the inherit-realtime directory inode flag.
92 See the xfs man page in section 5 for additional information.
96 config XFS_ONLINE_SCRUB
97 bool "XFS online metadata check support"
101 If you say Y here you will be able to check metadata on a
102 mounted XFS filesystem. This feature is intended to reduce
103 filesystem downtime by supplementing xfs_repair. The key
104 advantage here is to look for problems proactively so that
105 they can be dealt with in a controlled manner.
107 This feature is considered EXPERIMENTAL. Use with caution!
109 See the xfs_scrub man page in section 8 for additional information.
113 config XFS_ONLINE_REPAIR
114 bool "XFS online metadata repair support"
116 depends on XFS_FS && XFS_ONLINE_SCRUB
118 If you say Y here you will be able to repair metadata on a
119 mounted XFS filesystem. This feature is intended to reduce
120 filesystem downtime by fixing minor problems before they cause the
121 filesystem to go down. However, it requires that the filesystem be
122 formatted with secondary metadata, such as reverse mappings and inode
125 This feature is considered EXPERIMENTAL. Use with caution!
127 See the xfs_scrub man page in section 8 for additional information.
132 bool "XFS Verbose Warnings"
133 depends on XFS_FS && !XFS_DEBUG
135 Say Y here to get an XFS build with many additional warnings.
136 It converts ASSERT checks to WARN, so will log any out-of-bounds
137 conditions that occur that would otherwise be missed. It is much
138 lighter weight than XFS_DEBUG and does not modify algorithms and will
139 not cause the kernel to panic on non-fatal errors.
141 However, similar to XFS_DEBUG, it is only advisable to use this if you
142 are debugging a particular problem.
145 bool "XFS Debugging support"
148 Say Y here to get an XFS build with many debugging features,
149 including ASSERT checks, function wrappers around macros,
150 and extra sanity-checking functions in various code paths.
152 Note that the resulting code will be HUGE and SLOW, and probably
153 not useful unless you are debugging a particular problem.
155 Say N unless you are an XFS developer, or you play one on TV.
157 config XFS_ASSERT_FATAL
158 bool "XFS fatal asserts"
160 depends on XFS_FS && XFS_DEBUG
162 Set the default DEBUG mode ASSERT failure behavior.
164 Say Y here to cause DEBUG mode ASSERT failures to result in fatal
165 errors that BUG() the kernel by default. If you say N, ASSERT failures
168 This behavior can be modified at runtime via sysfs.