1# SPDX-License-Identifier: GPL-2.0-only 2config XFS_FS 3 tristate "XFS filesystem support" 4 depends on BLOCK 5 select EXPORTFS 6 select CRC32 7 select FS_IOMAP 8 help 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 14 and scalability. 15 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. 19 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. 24 25config XFS_SUPPORT_V4 26 bool "Support deprecated V4 (crc=0) format" 27 depends on XFS_FS 28 default n 29 help 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 35 from the backup. 36 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. 42 43 This option became 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. 46 47 To continue supporting the old V4 format (crc=0), say Y. 48 To close off an attack surface, say N. 49 50config XFS_SUPPORT_ASCII_CI 51 bool "Support deprecated case-insensitive ascii (ascii-ci=1) format" 52 depends on XFS_FS 53 default n 54 help 55 The ASCII case insensitivity filesystem feature only works correctly 56 on systems that have been coerced into using ISO 8859-1, and it does 57 not work on extended attributes. The kernel has no visibility into 58 the locale settings in userspace, so it corrupts UTF-8 names. 59 Enabling this feature makes XFS vulnerable to mixed case sensitivity 60 attacks. Because of this, the feature is deprecated. All users 61 should upgrade by backing up their files, reformatting, and restoring 62 from the backup. 63 64 Administrators and users can detect such a filesystem by running 65 xfs_info against a filesystem mountpoint and checking for a string 66 beginning with "ascii-ci=". If the string "ascii-ci=1" is found, the 67 filesystem is a case-insensitive filesystem. If no such string is 68 found, please upgrade xfsprogs to the latest version and try again. 69 70 This option became default N in September 2025. Support for the 71 feature will be removed entirely in September 2030. Distributors 72 can say N here to withdraw support earlier. 73 74 To continue supporting case-insensitivity (ascii-ci=1), say Y. 75 To close off an attack surface, say N. 76 77config XFS_QUOTA 78 bool "XFS Quota support" 79 depends on XFS_FS 80 select QUOTACTL 81 help 82 If you say Y here, you will be able to set limits for disk usage on 83 a per user and/or a per group basis under XFS. XFS considers quota 84 information as filesystem metadata and uses journaling to provide a 85 higher level guarantee of consistency. The on-disk data format for 86 quota is also compatible with the IRIX version of XFS, allowing a 87 filesystem to be migrated between Linux and IRIX without any need 88 for conversion. 89 90 If unsure, say N. More comprehensive documentation can be found in 91 README.quota in the xfsprogs package. XFS quota can be used either 92 with or without the generic quota support enabled (CONFIG_QUOTA) - 93 they are completely independent subsystems. 94 95config XFS_POSIX_ACL 96 bool "XFS POSIX ACL support" 97 depends on XFS_FS 98 select FS_POSIX_ACL 99 help 100 POSIX Access Control Lists (ACLs) support permissions for users and 101 groups beyond the owner/group/world scheme. 102 103 If you don't know what Access Control Lists are, say N. 104 105config XFS_RT 106 bool "XFS Realtime subvolume support" 107 depends on XFS_FS 108 default BLK_DEV_ZONED 109 help 110 If you say Y here you will be able to mount and use XFS filesystems 111 which contain a realtime subvolume. The realtime subvolume is a 112 separate area of disk space where only file data is stored. It was 113 originally designed to provide deterministic data rates suitable 114 for media streaming applications, but is also useful as a generic 115 mechanism for ensuring data and metadata/log I/Os are completely 116 separated. Regular file I/Os are isolated to a separate device 117 from all other requests, and this can be done quite transparently 118 to applications via the inherit-realtime directory inode flag. 119 120 See the xfs man page in section 5 for additional information. 121 122 This option is mandatory to support zoned block devices. For these 123 devices, the realtime subvolume must be backed by a zoned block 124 device and a regular block device used as the main device (for 125 metadata). If the zoned block device is a host-managed SMR hard-disk 126 containing conventional zones at the beginning of its address space, 127 XFS will use the disk conventional zones as the main device and the 128 remaining sequential write required zones as the backing storage for 129 the realtime subvolume. 130 131 If unsure, say N. 132 133config XFS_DRAIN_INTENTS 134 bool 135 select JUMP_LABEL if HAVE_ARCH_JUMP_LABEL 136 137config XFS_LIVE_HOOKS 138 bool 139 select JUMP_LABEL if HAVE_ARCH_JUMP_LABEL 140 141config XFS_MEMORY_BUFS 142 bool 143 144config XFS_BTREE_IN_MEM 145 bool 146 147config XFS_ONLINE_SCRUB 148 bool "XFS online metadata check support" 149 default y 150 depends on XFS_FS 151 depends on TMPFS && SHMEM 152 select XFS_LIVE_HOOKS 153 select XFS_DRAIN_INTENTS 154 select XFS_MEMORY_BUFS 155 help 156 If you say Y here you will be able to check metadata on a 157 mounted XFS filesystem. This feature is intended to reduce 158 filesystem downtime by supplementing xfs_repair. The key 159 advantage here is to look for problems proactively so that 160 they can be dealt with in a controlled manner. 161 162 See the xfs_scrub man page in section 8 for additional information. 163 164config XFS_ONLINE_SCRUB_STATS 165 bool "XFS online metadata check usage data collection" 166 default y 167 depends on XFS_ONLINE_SCRUB 168 depends on DEBUG_FS 169 help 170 If you say Y here, the kernel will gather usage data about 171 the online metadata check subsystem. This includes the number 172 of invocations, the outcomes, and the results of repairs, if any. 173 This may slow down scrub slightly due to the use of high precision 174 timers and the need to merge per-invocation information into the 175 filesystem counters. 176 177 Usage data are collected in /sys/kernel/debug/xfs/scrub. 178 179config XFS_ONLINE_REPAIR 180 bool "XFS online metadata repair support" 181 default y 182 depends on XFS_FS && XFS_ONLINE_SCRUB 183 select XFS_BTREE_IN_MEM 184 help 185 If you say Y here you will be able to repair metadata on a 186 mounted XFS filesystem. This feature is intended to reduce 187 filesystem downtime by fixing minor problems before they cause the 188 filesystem to go down. However, it requires that the filesystem be 189 formatted with secondary metadata, such as reverse mappings and inode 190 parent pointers. 191 192 See the xfs_scrub man page in section 8 for additional information. 193 194config XFS_WARN 195 bool "XFS Verbose Warnings" 196 depends on XFS_FS && !XFS_DEBUG 197 help 198 Say Y here to get an XFS build with many additional warnings. 199 It converts ASSERT checks to WARN, so will log any out-of-bounds 200 conditions that occur that would otherwise be missed. It is much 201 lighter weight than XFS_DEBUG and does not modify algorithms and will 202 not cause the kernel to panic on non-fatal errors. 203 204 However, similar to XFS_DEBUG, it is only advisable to use this if you 205 are debugging a particular problem. 206 207config XFS_DEBUG 208 bool "XFS Debugging support" 209 depends on XFS_FS 210 help 211 Say Y here to get an XFS build with many debugging features, 212 including ASSERT checks, function wrappers around macros, 213 and extra sanity-checking functions in various code paths. 214 215 Note that the resulting code will be HUGE and SLOW, and probably 216 not useful unless you are debugging a particular problem. 217 218 Say N unless you are an XFS developer, or you play one on TV. 219 220config XFS_DEBUG_EXPENSIVE 221 bool "XFS expensive debugging checks" 222 depends on XFS_FS && XFS_DEBUG 223 help 224 Say Y here to get an XFS build with expensive debugging checks 225 enabled. These checks may affect performance significantly. 226 227 Note that the resulting code will be HUGER and SLOWER, and probably 228 not useful unless you are debugging a particular problem. 229 230 Say N unless you are an XFS developer, or you play one on TV. 231 232config XFS_ASSERT_FATAL 233 bool "XFS fatal asserts" 234 default y 235 depends on XFS_FS && XFS_DEBUG 236 help 237 Set the default DEBUG mode ASSERT failure behavior. 238 239 Say Y here to cause DEBUG mode ASSERT failures to result in fatal 240 errors that BUG() the kernel by default. If you say N, ASSERT failures 241 result in warnings. 242 243 This behavior can be modified at runtime via sysfs. 244