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The C and C++ Include Header Files
/usr/include/linux/fs.h
$ cat -n /usr/include/linux/fs.h 1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2 #ifndef _LINUX_FS_H 3 #define _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 #include <linux/fscrypt.h> 17 18 /* Use of MS_* flags within the kernel is restricted to core mount(2) code. */ 19 #include <linux/mount.h> 20 21 /* 22 * It's silly to have NR_OPEN bigger than NR_FILE, but you can change 23 * the file limit at runtime and only root can increase the per-process 24 * nr_file rlimit, so it's safe to set up a ridiculously high absolute 25 * upper limit on files-per-process. 26 * 27 * Some programs (notably those using select()) may have to be 28 * recompiled to take full advantage of the new limits.. 29 */ 30 31 /* Fixed constants first: */ 32 #undef NR_OPEN 33 #define INR_OPEN_CUR 1024 /* Initial setting for nfile rlimits */ 34 #define INR_OPEN_MAX 4096 /* Hard limit for nfile rlimits */ 35 36 #define BLOCK_SIZE_BITS 10 37 #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS) 38 39 #define SEEK_SET 0 /* seek relative to beginning of file */ 40 #define SEEK_CUR 1 /* seek relative to current file position */ 41 #define SEEK_END 2 /* seek relative to end of file */ 42 #define SEEK_DATA 3 /* seek to the next data */ 43 #define SEEK_HOLE 4 /* seek to the next hole */ 44 #define SEEK_MAX SEEK_HOLE 45 46 #define RENAME_NOREPLACE (1 << 0) /* Don't overwrite target */ 47 #define RENAME_EXCHANGE (1 << 1) /* Exchange source and dest */ 48 #define RENAME_WHITEOUT (1 << 2) /* Whiteout source */ 49 50 struct file_clone_range { 51 __s64 src_fd; 52 __u64 src_offset; 53 __u64 src_length; 54 __u64 dest_offset; 55 }; 56 57 struct fstrim_range { 58 __u64 start; 59 __u64 len; 60 __u64 minlen; 61 }; 62 63 /* extent-same (dedupe) ioctls; these MUST match the btrfs ioctl definitions */ 64 #define FILE_DEDUPE_RANGE_SAME 0 65 #define FILE_DEDUPE_RANGE_DIFFERS 1 66 67 /* from struct btrfs_ioctl_file_extent_same_info */ 68 struct file_dedupe_range_info { 69 __s64 dest_fd; /* in - destination file */ 70 __u64 dest_offset; /* in - start of extent in destination */ 71 __u64 bytes_deduped; /* out - total # of bytes we were able 72 * to dedupe from this file. */ 73 /* status of this dedupe operation: 74 * < 0 for error 75 * == FILE_DEDUPE_RANGE_SAME if dedupe succeeds 76 * == FILE_DEDUPE_RANGE_DIFFERS if data differs 77 */ 78 __s32 status; /* out - see above description */ 79 __u32 reserved; /* must be zero */ 80 }; 81 82 /* from struct btrfs_ioctl_file_extent_same_args */ 83 struct file_dedupe_range { 84 __u64 src_offset; /* in - start of extent in source */ 85 __u64 src_length; /* in - length of extent */ 86 __u16 dest_count; /* in - total elements in info array */ 87 __u16 reserved1; /* must be zero */ 88 __u32 reserved2; /* must be zero */ 89 struct file_dedupe_range_info info[]; 90 }; 91 92 /* And dynamically-tunable limits and defaults: */ 93 struct files_stat_struct { 94 unsigned long nr_files; /* read only */ 95 unsigned long nr_free_files; /* read only */ 96 unsigned long max_files; /* tunable */ 97 }; 98 99 struct inodes_stat_t { 100 long nr_inodes; 101 long nr_unused; 102 long dummy[5]; /* padding for sysctl ABI compatibility */ 103 }; 104 105 106 #define NR_FILE 8192 /* this can well be larger on a larger system */ 107 108 /* 109 * Structure for FS_IOC_FSGETXATTR[A] and FS_IOC_FSSETXATTR. 110 */ 111 struct fsxattr { 112 __u32 fsx_xflags; /* xflags field value (get/set) */ 113 __u32 fsx_extsize; /* extsize field value (get/set)*/ 114 __u32 fsx_nextents; /* nextents field value (get) */ 115 __u32 fsx_projid; /* project identifier (get/set) */ 116 __u32 fsx_cowextsize; /* CoW extsize field value (get/set)*/ 117 unsigned char fsx_pad[8]; 118 }; 119 120 /* 121 * Flags for the fsx_xflags field 122 */ 123 #define FS_XFLAG_REALTIME 0x00000001 /* data in realtime volume */ 124 #define FS_XFLAG_PREALLOC 0x00000002 /* preallocated file extents */ 125 #define FS_XFLAG_IMMUTABLE 0x00000008 /* file cannot be modified */ 126 #define FS_XFLAG_APPEND 0x00000010 /* all writes append */ 127 #define FS_XFLAG_SYNC 0x00000020 /* all writes synchronous */ 128 #define FS_XFLAG_NOATIME 0x00000040 /* do not update access time */ 129 #define FS_XFLAG_NODUMP 0x00000080 /* do not include in backups */ 130 #define FS_XFLAG_RTINHERIT 0x00000100 /* create with rt bit set */ 131 #define FS_XFLAG_PROJINHERIT 0x00000200 /* create with parents projid */ 132 #define FS_XFLAG_NOSYMLINKS 0x00000400 /* disallow symlink creation */ 133 #define FS_XFLAG_EXTSIZE 0x00000800 /* extent size allocator hint */ 134 #define FS_XFLAG_EXTSZINHERIT 0x00001000 /* inherit inode extent size */ 135 #define FS_XFLAG_NODEFRAG 0x00002000 /* do not defragment */ 136 #define FS_XFLAG_FILESTREAM 0x00004000 /* use filestream allocator */ 137 #define FS_XFLAG_DAX 0x00008000 /* use DAX for IO */ 138 #define FS_XFLAG_COWEXTSIZE 0x00010000 /* CoW extent size allocator hint */ 139 #define FS_XFLAG_HASATTR 0x80000000 /* no DIFLAG for this */ 140 141 /* the read-only stuff doesn't really belong here, but any other place is 142 probably as bad and I don't want to create yet another include file. */ 143 144 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */ 145 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */ 146 #define BLKRRPART _IO(0x12,95) /* re-read partition table */ 147 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */ 148 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */ 149 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */ 150 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */ 151 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */ 152 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */ 153 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */ 154 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */ 155 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */ 156 #if 0 157 #define BLKPG _IO(0x12,105)/* See blkpg.h */ 158 159 /* Some people are morons. Do not use sizeof! */ 160 161 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */ 162 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */ 163 /* This was here just to show that the number is taken - 164 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */ 165 #endif 166 /* A jump here: 108-111 have been used for various private purposes. */ 167 #define BLKBSZGET _IOR(0x12,112,size_t) 168 #define BLKBSZSET _IOW(0x12,113,size_t) 169 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */ 170 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup) 171 #define BLKTRACESTART _IO(0x12,116) 172 #define BLKTRACESTOP _IO(0x12,117) 173 #define BLKTRACETEARDOWN _IO(0x12,118) 174 #define BLKDISCARD _IO(0x12,119) 175 #define BLKIOMIN _IO(0x12,120) 176 #define BLKIOOPT _IO(0x12,121) 177 #define BLKALIGNOFF _IO(0x12,122) 178 #define BLKPBSZGET _IO(0x12,123) 179 #define BLKDISCARDZEROES _IO(0x12,124) 180 #define BLKSECDISCARD _IO(0x12,125) 181 #define BLKROTATIONAL _IO(0x12,126) 182 #define BLKZEROOUT _IO(0x12,127) 183 #define BLKGETDISKSEQ _IOR(0x12,128,__u64) 184 /* 185 * A jump here: 130-136 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 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS) 217 * 218 * Note: for historical reasons, these flags were originally used and 219 * defined for use by ext2/ext3, and then other file systems started 220 * using these flags so they wouldn't need to write their own version 221 * of chattr/lsattr (which was shipped as part of e2fsprogs). You 222 * should think twice before trying to use these flags in new 223 * contexts, or trying to assign these flags, since they are used both 224 * as the UAPI and the on-disk encoding for ext2/3/4. Also, we are 225 * almost out of 32-bit flags. :-) 226 * 227 * We have recently hoisted FS_IOC_FSGETXATTR / FS_IOC_FSSETXATTR from 228 * XFS to the generic FS level interface. This uses a structure that 229 * has padding and hence has more room to grow, so it may be more 230 * appropriate for many new use cases. 231 * 232 * Please do not change these flags or interfaces before checking with 233 * linux-fsdevel@vger.kernel.org and linux-api@vger.kernel.org. 234 */ 235 #define FS_SECRM_FL 0x00000001 /* Secure deletion */ 236 #define FS_UNRM_FL 0x00000002 /* Undelete */ 237 #define FS_COMPR_FL 0x00000004 /* Compress file */ 238 #define FS_SYNC_FL 0x00000008 /* Synchronous updates */ 239 #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */ 240 #define FS_APPEND_FL 0x00000020 /* writes to file may only append */ 241 #define FS_NODUMP_FL 0x00000040 /* do not dump file */ 242 #define FS_NOATIME_FL 0x00000080 /* do not update atime */ 243 /* Reserved for compression usage... */ 244 #define FS_DIRTY_FL 0x00000100 245 #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 246 #define FS_NOCOMP_FL 0x00000400 /* Don't compress */ 247 /* End compression flags --- maybe not all used */ 248 #define FS_ENCRYPT_FL 0x00000800 /* Encrypted file */ 249 #define FS_BTREE_FL 0x00001000 /* btree format dir */ 250 #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */ 251 #define FS_IMAGIC_FL 0x00002000 /* AFS directory */ 252 #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */ 253 #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 254 #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 255 #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 256 #define FS_HUGE_FILE_FL 0x00040000 /* Reserved for ext4 */ 257 #define FS_EXTENT_FL 0x00080000 /* Extents */ 258 #define FS_VERITY_FL 0x00100000 /* Verity protected inode */ 259 #define FS_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 260 #define FS_EOFBLOCKS_FL 0x00400000 /* Reserved for ext4 */ 261 #define FS_NOCOW_FL 0x00800000 /* Do not cow file */ 262 #define FS_DAX_FL 0x02000000 /* Inode is DAX */ 263 #define FS_INLINE_DATA_FL 0x10000000 /* Reserved for ext4 */ 264 #define FS_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 265 #define FS_CASEFOLD_FL 0x40000000 /* Folder is case insensitive */ 266 #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 267 268 #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */ 269 #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */ 270 271 272 #define SYNC_FILE_RANGE_WAIT_BEFORE 1 273 #define SYNC_FILE_RANGE_WRITE 2 274 #define SYNC_FILE_RANGE_WAIT_AFTER 4 275 #define SYNC_FILE_RANGE_WRITE_AND_WAIT (SYNC_FILE_RANGE_WRITE | \ 276 SYNC_FILE_RANGE_WAIT_BEFORE | \ 277 SYNC_FILE_RANGE_WAIT_AFTER) 278 279 /* 280 * Flags for preadv2/pwritev2: 281 */ 282 283 typedef int __bitwise __kernel_rwf_t; 284 285 /* high priority request, poll if possible */ 286 #define RWF_HIPRI ((__kernel_rwf_t)0x00000001) 287 288 /* per-IO O_DSYNC */ 289 #define RWF_DSYNC ((__kernel_rwf_t)0x00000002) 290 291 /* per-IO O_SYNC */ 292 #define RWF_SYNC ((__kernel_rwf_t)0x00000004) 293 294 /* per-IO, return -EAGAIN if operation would block */ 295 #define RWF_NOWAIT ((__kernel_rwf_t)0x00000008) 296 297 /* per-IO O_APPEND */ 298 #define RWF_APPEND ((__kernel_rwf_t)0x00000010) 299 300 /* mask of flags supported by the kernel */ 301 #define RWF_SUPPORTED (RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT |\ 302 RWF_APPEND) 303 304 /* Pagemap ioctl */ 305 #define PAGEMAP_SCAN _IOWR('f', 16, struct pm_scan_arg) 306 307 /* Bitmasks provided in pm_scan_args masks and reported in page_region.categories. */ 308 #define PAGE_IS_WPALLOWED (1 << 0) 309 #define PAGE_IS_WRITTEN (1 << 1) 310 #define PAGE_IS_FILE (1 << 2) 311 #define PAGE_IS_PRESENT (1 << 3) 312 #define PAGE_IS_SWAPPED (1 << 4) 313 #define PAGE_IS_PFNZERO (1 << 5) 314 #define PAGE_IS_HUGE (1 << 6) 315 #define PAGE_IS_SOFT_DIRTY (1 << 7) 316 317 /* 318 * struct page_region - Page region with flags 319 * @start: Start of the region 320 * @end: End of the region (exclusive) 321 * @categories: PAGE_IS_* category bitmask for the region 322 */ 323 struct page_region { 324 __u64 start; 325 __u64 end; 326 __u64 categories; 327 }; 328 329 /* Flags for PAGEMAP_SCAN ioctl */ 330 #define PM_SCAN_WP_MATCHING (1 << 0) /* Write protect the pages matched. */ 331 #define PM_SCAN_CHECK_WPASYNC (1 << 1) /* Abort the scan when a non-WP-enabled page is found. */ 332 333 /* 334 * struct pm_scan_arg - Pagemap ioctl argument 335 * @size: Size of the structure 336 * @flags: Flags for the IOCTL 337 * @start: Starting address of the region 338 * @end: Ending address of the region 339 * @walk_end Address where the scan stopped (written by kernel). 340 * walk_end == end (address tags cleared) informs that the scan completed on entire range. 341 * @vec: Address of page_region struct array for output 342 * @vec_len: Length of the page_region struct array 343 * @max_pages: Optional limit for number of returned pages (0 = disabled) 344 * @category_inverted: PAGE_IS_* categories which values match if 0 instead of 1 345 * @category_mask: Skip pages for which any category doesn't match 346 * @category_anyof_mask: Skip pages for which no category matches 347 * @return_mask: PAGE_IS_* categories that are to be reported in `page_region`s returned 348 */ 349 struct pm_scan_arg { 350 __u64 size; 351 __u64 flags; 352 __u64 start; 353 __u64 end; 354 __u64 walk_end; 355 __u64 vec; 356 __u64 vec_len; 357 __u64 max_pages; 358 __u64 category_inverted; 359 __u64 category_mask; 360 __u64 category_anyof_mask; 361 __u64 return_mask; 362 }; 363 364 #endif /* _LINUX_FS_H */
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