1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2 #ifndef _UAPI_LINUX_FS_H 3 #define _UAPI_LINUX_FS_H 4 5 /* 6 * This file has definitions for some important file table structures 7 * and constants and structures used by various generic file system 8 * ioctl's. Please do not make any changes in this file before 9 * sending patches for review to linux-fsdevel@vger.kernel.org and 10 * linux-api@vger.kernel.org. 11 */ 12 13 #include <linux/limits.h> 14 #include <linux/ioctl.h> 15 #include <linux/types.h> 16 17 /* Use of MS_* flags within the kernel is restricted to core mount(2) code. */ 18 #if !defined(__KERNEL__) 19 #include <linux/mount.h> 20 #endif 21 22 /* 23 * It's silly to have NR_OPEN bigger than NR_FILE, but you can change 24 * the file limit at runtime and only root can increase the per-process 25 * nr_file rlimit, so it's safe to set up a ridiculously high absolute 26 * upper limit on files-per-process. 27 * 28 * Some programs (notably those using select()) may have to be 29 * recompiled to take full advantage of the new limits.. 30 */ 31 32 /* Fixed constants first: */ 33 #undef NR_OPEN 34 #define INR_OPEN_CUR 1024 /* Initial setting for nfile rlimits */ 35 #define INR_OPEN_MAX 4096 /* Hard limit for nfile rlimits */ 36 37 #define BLOCK_SIZE_BITS 10 38 #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS) 39 40 #define SEEK_SET 0 /* seek relative to beginning of file */ 41 #define SEEK_CUR 1 /* seek relative to current file position */ 42 #define SEEK_END 2 /* seek relative to end of file */ 43 #define SEEK_DATA 3 /* seek to the next data */ 44 #define SEEK_HOLE 4 /* seek to the next hole */ 45 #define SEEK_MAX SEEK_HOLE 46 47 #define RENAME_NOREPLACE (1 << 0) /* Don't overwrite target */ 48 #define RENAME_EXCHANGE (1 << 1) /* Exchange source and dest */ 49 #define RENAME_WHITEOUT (1 << 2) /* Whiteout source */ 50 51 struct file_clone_range { 52 __s64 src_fd; 53 __u64 src_offset; 54 __u64 src_length; 55 __u64 dest_offset; 56 }; 57 58 struct fstrim_range { 59 __u64 start; 60 __u64 len; 61 __u64 minlen; 62 }; 63 64 /* extent-same (dedupe) ioctls; these MUST match the btrfs ioctl definitions */ 65 #define FILE_DEDUPE_RANGE_SAME 0 66 #define FILE_DEDUPE_RANGE_DIFFERS 1 67 68 /* from struct btrfs_ioctl_file_extent_same_info */ 69 struct file_dedupe_range_info { 70 __s64 dest_fd; /* in - destination file */ 71 __u64 dest_offset; /* in - start of extent in destination */ 72 __u64 bytes_deduped; /* out - total # of bytes we were able 73 * to dedupe from this file. */ 74 /* status of this dedupe operation: 75 * < 0 for error 76 * == FILE_DEDUPE_RANGE_SAME if dedupe succeeds 77 * == FILE_DEDUPE_RANGE_DIFFERS if data differs 78 */ 79 __s32 status; /* out - see above description */ 80 __u32 reserved; /* must be zero */ 81 }; 82 83 /* from struct btrfs_ioctl_file_extent_same_args */ 84 struct file_dedupe_range { 85 __u64 src_offset; /* in - start of extent in source */ 86 __u64 src_length; /* in - length of extent */ 87 __u16 dest_count; /* in - total elements in info array */ 88 __u16 reserved1; /* must be zero */ 89 __u32 reserved2; /* must be zero */ 90 struct file_dedupe_range_info info[0]; 91 }; 92 93 /* And dynamically-tunable limits and defaults: */ 94 struct files_stat_struct { 95 unsigned long nr_files; /* read only */ 96 unsigned long nr_free_files; /* read only */ 97 unsigned long max_files; /* tunable */ 98 }; 99 100 struct inodes_stat_t { 101 long nr_inodes; 102 long nr_unused; 103 long dummy[5]; /* padding for sysctl ABI compatibility */ 104 }; 105 106 107 #define NR_FILE 8192 /* this can well be larger on a larger system */ 108 109 /* 110 * Structure for FS_IOC_FSGETXATTR[A] and FS_IOC_FSSETXATTR. 111 */ 112 struct fsxattr { 113 __u32 fsx_xflags; /* xflags field value (get/set) */ 114 __u32 fsx_extsize; /* extsize field value (get/set)*/ 115 __u32 fsx_nextents; /* nextents field value (get) */ 116 __u32 fsx_projid; /* project identifier (get/set) */ 117 __u32 fsx_cowextsize; /* CoW extsize field value (get/set)*/ 118 unsigned char fsx_pad[8]; 119 }; 120 121 /* 122 * Flags for the fsx_xflags field 123 */ 124 #define FS_XFLAG_REALTIME 0x00000001 /* data in realtime volume */ 125 #define FS_XFLAG_PREALLOC 0x00000002 /* preallocated file extents */ 126 #define FS_XFLAG_IMMUTABLE 0x00000008 /* file cannot be modified */ 127 #define FS_XFLAG_APPEND 0x00000010 /* all writes append */ 128 #define FS_XFLAG_SYNC 0x00000020 /* all writes synchronous */ 129 #define FS_XFLAG_NOATIME 0x00000040 /* do not update access time */ 130 #define FS_XFLAG_NODUMP 0x00000080 /* do not include in backups */ 131 #define FS_XFLAG_RTINHERIT 0x00000100 /* create with rt bit set */ 132 #define FS_XFLAG_PROJINHERIT 0x00000200 /* create with parents projid */ 133 #define FS_XFLAG_NOSYMLINKS 0x00000400 /* disallow symlink creation */ 134 #define FS_XFLAG_EXTSIZE 0x00000800 /* extent size allocator hint */ 135 #define FS_XFLAG_EXTSZINHERIT 0x00001000 /* inherit inode extent size */ 136 #define FS_XFLAG_NODEFRAG 0x00002000 /* do not defragment */ 137 #define FS_XFLAG_FILESTREAM 0x00004000 /* use filestream allocator */ 138 #define FS_XFLAG_DAX 0x00008000 /* use DAX for IO */ 139 #define FS_XFLAG_COWEXTSIZE 0x00010000 /* CoW extent size allocator hint */ 140 #define FS_XFLAG_HASATTR 0x80000000 /* no DIFLAG for this */ 141 142 /* the read-only stuff doesn't really belong here, but any other place is 143 probably as bad and I don't want to create yet another include file. */ 144 145 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */ 146 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */ 147 #define BLKRRPART _IO(0x12,95) /* re-read partition table */ 148 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */ 149 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */ 150 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */ 151 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */ 152 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */ 153 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */ 154 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */ 155 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */ 156 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */ 157 #if 0 158 #define BLKPG _IO(0x12,105)/* See blkpg.h */ 159 160 /* Some people are morons. Do not use sizeof! */ 161 162 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */ 163 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */ 164 /* This was here just to show that the number is taken - 165 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */ 166 #endif 167 /* A jump here: 108-111 have been used for various private purposes. */ 168 #define BLKBSZGET _IOR(0x12,112,size_t) 169 #define BLKBSZSET _IOW(0x12,113,size_t) 170 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */ 171 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup) 172 #define BLKTRACESTART _IO(0x12,116) 173 #define BLKTRACESTOP _IO(0x12,117) 174 #define BLKTRACETEARDOWN _IO(0x12,118) 175 #define BLKDISCARD _IO(0x12,119) 176 #define BLKIOMIN _IO(0x12,120) 177 #define BLKIOOPT _IO(0x12,121) 178 #define BLKALIGNOFF _IO(0x12,122) 179 #define BLKPBSZGET _IO(0x12,123) 180 #define BLKDISCARDZEROES _IO(0x12,124) 181 #define BLKSECDISCARD _IO(0x12,125) 182 #define BLKROTATIONAL _IO(0x12,126) 183 #define BLKZEROOUT _IO(0x12,127) 184 /* 185 * A jump here: 130-131 are reserved for zoned block devices 186 * (see uapi/linux/blkzoned.h) 187 */ 188 189 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */ 190 #define FIBMAP _IO(0x00,1) /* bmap access */ 191 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */ 192 #define FIFREEZE _IOWR('X', 119, int) /* Freeze */ 193 #define FITHAW _IOWR('X', 120, int) /* Thaw */ 194 #define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */ 195 #define FICLONE _IOW(0x94, 9, int) 196 #define FICLONERANGE _IOW(0x94, 13, struct file_clone_range) 197 #define FIDEDUPERANGE _IOWR(0x94, 54, struct file_dedupe_range) 198 199 #define FSLABEL_MAX 256 /* Max chars for the interface; each fs may differ */ 200 201 #define FS_IOC_GETFLAGS _IOR('f', 1, long) 202 #define FS_IOC_SETFLAGS _IOW('f', 2, long) 203 #define FS_IOC_GETVERSION _IOR('v', 1, long) 204 #define FS_IOC_SETVERSION _IOW('v', 2, long) 205 #define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap) 206 #define FS_IOC32_GETFLAGS _IOR('f', 1, int) 207 #define FS_IOC32_SETFLAGS _IOW('f', 2, int) 208 #define FS_IOC32_GETVERSION _IOR('v', 1, int) 209 #define FS_IOC32_SETVERSION _IOW('v', 2, int) 210 #define FS_IOC_FSGETXATTR _IOR('X', 31, struct fsxattr) 211 #define FS_IOC_FSSETXATTR _IOW('X', 32, struct fsxattr) 212 #define FS_IOC_GETFSLABEL _IOR(0x94, 49, char[FSLABEL_MAX]) 213 #define FS_IOC_SETFSLABEL _IOW(0x94, 50, char[FSLABEL_MAX]) 214 215 /* 216 * File system encryption support 217 */ 218 /* Policy provided via an ioctl on the topmost directory */ 219 #define FS_KEY_DESCRIPTOR_SIZE 8 220 221 #define FS_POLICY_FLAGS_PAD_4 0x00 222 #define FS_POLICY_FLAGS_PAD_8 0x01 223 #define FS_POLICY_FLAGS_PAD_16 0x02 224 #define FS_POLICY_FLAGS_PAD_32 0x03 225 #define FS_POLICY_FLAGS_PAD_MASK 0x03 226 #define FS_POLICY_FLAG_DIRECT_KEY 0x04 /* use master key directly */ 227 #define FS_POLICY_FLAGS_VALID 0x07 228 229 /* Encryption algorithms */ 230 #define FS_ENCRYPTION_MODE_INVALID 0 231 #define FS_ENCRYPTION_MODE_AES_256_XTS 1 232 #define FS_ENCRYPTION_MODE_AES_256_GCM 2 233 #define FS_ENCRYPTION_MODE_AES_256_CBC 3 234 #define FS_ENCRYPTION_MODE_AES_256_CTS 4 235 #define FS_ENCRYPTION_MODE_AES_128_CBC 5 236 #define FS_ENCRYPTION_MODE_AES_128_CTS 6 237 #define FS_ENCRYPTION_MODE_SPECK128_256_XTS 7 /* Removed, do not use. */ 238 #define FS_ENCRYPTION_MODE_SPECK128_256_CTS 8 /* Removed, do not use. */ 239 #define FS_ENCRYPTION_MODE_ADIANTUM 9 240 241 struct fscrypt_policy { 242 __u8 version; 243 __u8 contents_encryption_mode; 244 __u8 filenames_encryption_mode; 245 __u8 flags; 246 __u8 master_key_descriptor[FS_KEY_DESCRIPTOR_SIZE]; 247 }; 248 249 #define FS_IOC_SET_ENCRYPTION_POLICY _IOR('f', 19, struct fscrypt_policy) 250 #define FS_IOC_GET_ENCRYPTION_PWSALT _IOW('f', 20, __u8[16]) 251 #define FS_IOC_GET_ENCRYPTION_POLICY _IOW('f', 21, struct fscrypt_policy) 252 253 /* Parameters for passing an encryption key into the kernel keyring */ 254 #define FS_KEY_DESC_PREFIX "fscrypt:" 255 #define FS_KEY_DESC_PREFIX_SIZE 8 256 257 /* Structure that userspace passes to the kernel keyring */ 258 #define FS_MAX_KEY_SIZE 64 259 260 struct fscrypt_key { 261 __u32 mode; 262 __u8 raw[FS_MAX_KEY_SIZE]; 263 __u32 size; 264 }; 265 266 /* 267 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS) 268 * 269 * Note: for historical reasons, these flags were originally used and 270 * defined for use by ext2/ext3, and then other file systems started 271 * using these flags so they wouldn't need to write their own version 272 * of chattr/lsattr (which was shipped as part of e2fsprogs). You 273 * should think twice before trying to use these flags in new 274 * contexts, or trying to assign these flags, since they are used both 275 * as the UAPI and the on-disk encoding for ext2/3/4. Also, we are 276 * almost out of 32-bit flags. :-) 277 * 278 * We have recently hoisted FS_IOC_FSGETXATTR / FS_IOC_FSSETXATTR from 279 * XFS to the generic FS level interface. This uses a structure that 280 * has padding and hence has more room to grow, so it may be more 281 * appropriate for many new use cases. 282 * 283 * Please do not change these flags or interfaces before checking with 284 * linux-fsdevel@vger.kernel.org and linux-api@vger.kernel.org. 285 */ 286 #define FS_SECRM_FL 0x00000001 /* Secure deletion */ 287 #define FS_UNRM_FL 0x00000002 /* Undelete */ 288 #define FS_COMPR_FL 0x00000004 /* Compress file */ 289 #define FS_SYNC_FL 0x00000008 /* Synchronous updates */ 290 #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */ 291 #define FS_APPEND_FL 0x00000020 /* writes to file may only append */ 292 #define FS_NODUMP_FL 0x00000040 /* do not dump file */ 293 #define FS_NOATIME_FL 0x00000080 /* do not update atime */ 294 /* Reserved for compression usage... */ 295 #define FS_DIRTY_FL 0x00000100 296 #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 297 #define FS_NOCOMP_FL 0x00000400 /* Don't compress */ 298 /* End compression flags --- maybe not all used */ 299 #define FS_ENCRYPT_FL 0x00000800 /* Encrypted file */ 300 #define FS_BTREE_FL 0x00001000 /* btree format dir */ 301 #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */ 302 #define FS_IMAGIC_FL 0x00002000 /* AFS directory */ 303 #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */ 304 #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 305 #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 306 #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 307 #define FS_HUGE_FILE_FL 0x00040000 /* Reserved for ext4 */ 308 #define FS_EXTENT_FL 0x00080000 /* Extents */ 309 #define FS_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 310 #define FS_EOFBLOCKS_FL 0x00400000 /* Reserved for ext4 */ 311 #define FS_NOCOW_FL 0x00800000 /* Do not cow file */ 312 #define FS_INLINE_DATA_FL 0x10000000 /* Reserved for ext4 */ 313 #define FS_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 314 #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 315 316 #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */ 317 #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */ 318 319 320 #define SYNC_FILE_RANGE_WAIT_BEFORE 1 321 #define SYNC_FILE_RANGE_WRITE 2 322 #define SYNC_FILE_RANGE_WAIT_AFTER 4 323 324 /* 325 * Flags for preadv2/pwritev2: 326 */ 327 328 typedef int __bitwise __kernel_rwf_t; 329 330 /* high priority request, poll if possible */ 331 #define RWF_HIPRI ((__force __kernel_rwf_t)0x00000001) 332 333 /* per-IO O_DSYNC */ 334 #define RWF_DSYNC ((__force __kernel_rwf_t)0x00000002) 335 336 /* per-IO O_SYNC */ 337 #define RWF_SYNC ((__force __kernel_rwf_t)0x00000004) 338 339 /* per-IO, return -EAGAIN if operation would block */ 340 #define RWF_NOWAIT ((__force __kernel_rwf_t)0x00000008) 341 342 /* per-IO O_APPEND */ 343 #define RWF_APPEND ((__force __kernel_rwf_t)0x00000010) 344 345 /* mask of flags supported by the kernel */ 346 #define RWF_SUPPORTED (RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT |\ 347 RWF_APPEND) 348 349 #endif /* _UAPI_LINUX_FS_H */ 350