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#ifndef __KERNEL__ 17#include <linux/fscrypt.h> 18#endif 19 20/* Use of MS_* flags within the kernel is restricted to core mount(2) code. */ 21#if !defined(__KERNEL__) 22#include <linux/mount.h> 23#endif 24 25/* 26 * It's silly to have NR_OPEN bigger than NR_FILE, but you can change 27 * the file limit at runtime and only root can increase the per-process 28 * nr_file rlimit, so it's safe to set up a ridiculously high absolute 29 * upper limit on files-per-process. 30 * 31 * Some programs (notably those using select()) may have to be 32 * recompiled to take full advantage of the new limits.. 33 */ 34 35/* Fixed constants first: */ 36#undef NR_OPEN 37#define INR_OPEN_CUR 1024 /* Initial setting for nfile rlimits */ 38#define INR_OPEN_MAX 4096 /* Hard limit for nfile rlimits */ 39 40#define BLOCK_SIZE_BITS 10 41#define BLOCK_SIZE (1<<BLOCK_SIZE_BITS) 42 43#define SEEK_SET 0 /* seek relative to beginning of file */ 44#define SEEK_CUR 1 /* seek relative to current file position */ 45#define SEEK_END 2 /* seek relative to end of file */ 46#define SEEK_DATA 3 /* seek to the next data */ 47#define SEEK_HOLE 4 /* seek to the next hole */ 48#define SEEK_MAX SEEK_HOLE 49 50#define RENAME_NOREPLACE (1 << 0) /* Don't overwrite target */ 51#define RENAME_EXCHANGE (1 << 1) /* Exchange source and dest */ 52#define RENAME_WHITEOUT (1 << 2) /* Whiteout source */ 53 54struct file_clone_range { 55 __s64 src_fd; 56 __u64 src_offset; 57 __u64 src_length; 58 __u64 dest_offset; 59}; 60 61struct fstrim_range { 62 __u64 start; 63 __u64 len; 64 __u64 minlen; 65}; 66 67/* 68 * We include a length field because some filesystems (vfat) have an identifier 69 * that we do want to expose as a UUID, but doesn't have the standard length. 70 * 71 * We use a fixed size buffer beacuse this interface will, by fiat, never 72 * support "UUIDs" longer than 16 bytes; we don't want to force all downstream 73 * users to have to deal with that. 74 */ 75struct fsuuid2 { 76 __u8 len; 77 __u8 uuid[16]; 78}; 79 80struct fs_sysfs_path { 81 __u8 len; 82 __u8 name[128]; 83}; 84 85/* extent-same (dedupe) ioctls; these MUST match the btrfs ioctl definitions */ 86#define FILE_DEDUPE_RANGE_SAME 0 87#define FILE_DEDUPE_RANGE_DIFFERS 1 88 89/* from struct btrfs_ioctl_file_extent_same_info */ 90struct file_dedupe_range_info { 91 __s64 dest_fd; /* in - destination file */ 92 __u64 dest_offset; /* in - start of extent in destination */ 93 __u64 bytes_deduped; /* out - total # of bytes we were able 94 * to dedupe from this file. */ 95 /* status of this dedupe operation: 96 * < 0 for error 97 * == FILE_DEDUPE_RANGE_SAME if dedupe succeeds 98 * == FILE_DEDUPE_RANGE_DIFFERS if data differs 99 */ 100 __s32 status; /* out - see above description */ 101 __u32 reserved; /* must be zero */ 102}; 103 104/* from struct btrfs_ioctl_file_extent_same_args */ 105struct file_dedupe_range { 106 __u64 src_offset; /* in - start of extent in source */ 107 __u64 src_length; /* in - length of extent */ 108 __u16 dest_count; /* in - total elements in info array */ 109 __u16 reserved1; /* must be zero */ 110 __u32 reserved2; /* must be zero */ 111 struct file_dedupe_range_info info[]; 112}; 113 114/* And dynamically-tunable limits and defaults: */ 115struct files_stat_struct { 116 unsigned long nr_files; /* read only */ 117 unsigned long nr_free_files; /* read only */ 118 unsigned long max_files; /* tunable */ 119}; 120 121struct inodes_stat_t { 122 long nr_inodes; 123 long nr_unused; 124 long dummy[5]; /* padding for sysctl ABI compatibility */ 125}; 126 127 128#define NR_FILE 8192 /* this can well be larger on a larger system */ 129 130/* 131 * Structure for FS_IOC_FSGETXATTR[A] and FS_IOC_FSSETXATTR. 132 */ 133struct fsxattr { 134 __u32 fsx_xflags; /* xflags field value (get/set) */ 135 __u32 fsx_extsize; /* extsize field value (get/set)*/ 136 __u32 fsx_nextents; /* nextents field value (get) */ 137 __u32 fsx_projid; /* project identifier (get/set) */ 138 __u32 fsx_cowextsize; /* CoW extsize field value (get/set)*/ 139 unsigned char fsx_pad[8]; 140}; 141 142/* 143 * Flags for the fsx_xflags field 144 */ 145#define FS_XFLAG_REALTIME 0x00000001 /* data in realtime volume */ 146#define FS_XFLAG_PREALLOC 0x00000002 /* preallocated file extents */ 147#define FS_XFLAG_IMMUTABLE 0x00000008 /* file cannot be modified */ 148#define FS_XFLAG_APPEND 0x00000010 /* all writes append */ 149#define FS_XFLAG_SYNC 0x00000020 /* all writes synchronous */ 150#define FS_XFLAG_NOATIME 0x00000040 /* do not update access time */ 151#define FS_XFLAG_NODUMP 0x00000080 /* do not include in backups */ 152#define FS_XFLAG_RTINHERIT 0x00000100 /* create with rt bit set */ 153#define FS_XFLAG_PROJINHERIT 0x00000200 /* create with parents projid */ 154#define FS_XFLAG_NOSYMLINKS 0x00000400 /* disallow symlink creation */ 155#define FS_XFLAG_EXTSIZE 0x00000800 /* extent size allocator hint */ 156#define FS_XFLAG_EXTSZINHERIT 0x00001000 /* inherit inode extent size */ 157#define FS_XFLAG_NODEFRAG 0x00002000 /* do not defragment */ 158#define FS_XFLAG_FILESTREAM 0x00004000 /* use filestream allocator */ 159#define FS_XFLAG_DAX 0x00008000 /* use DAX for IO */ 160#define FS_XFLAG_COWEXTSIZE 0x00010000 /* CoW extent size allocator hint */ 161#define FS_XFLAG_HASATTR 0x80000000 /* no DIFLAG for this */ 162 163/* the read-only stuff doesn't really belong here, but any other place is 164 probably as bad and I don't want to create yet another include file. */ 165 166#define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */ 167#define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */ 168#define BLKRRPART _IO(0x12,95) /* re-read partition table */ 169#define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */ 170#define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */ 171#define BLKRASET _IO(0x12,98) /* set read ahead for block device */ 172#define BLKRAGET _IO(0x12,99) /* get current read ahead setting */ 173#define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */ 174#define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */ 175#define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */ 176#define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */ 177#define BLKSSZGET _IO(0x12,104)/* get block device sector size */ 178#if 0 179#define BLKPG _IO(0x12,105)/* See blkpg.h */ 180 181/* Some people are morons. Do not use sizeof! */ 182 183#define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */ 184#define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */ 185/* This was here just to show that the number is taken - 186 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */ 187#endif 188/* A jump here: 108-111 have been used for various private purposes. */ 189#define BLKBSZGET _IOR(0x12,112,size_t) 190#define BLKBSZSET _IOW(0x12,113,size_t) 191#define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */ 192#define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup) 193#define BLKTRACESTART _IO(0x12,116) 194#define BLKTRACESTOP _IO(0x12,117) 195#define BLKTRACETEARDOWN _IO(0x12,118) 196#define BLKDISCARD _IO(0x12,119) 197#define BLKIOMIN _IO(0x12,120) 198#define BLKIOOPT _IO(0x12,121) 199#define BLKALIGNOFF _IO(0x12,122) 200#define BLKPBSZGET _IO(0x12,123) 201#define BLKDISCARDZEROES _IO(0x12,124) 202#define BLKSECDISCARD _IO(0x12,125) 203#define BLKROTATIONAL _IO(0x12,126) 204#define BLKZEROOUT _IO(0x12,127) 205#define BLKGETDISKSEQ _IOR(0x12,128,__u64) 206/* 207 * A jump here: 130-136 are reserved for zoned block devices 208 * (see uapi/linux/blkzoned.h) 209 */ 210 211#define BMAP_IOCTL 1 /* obsolete - kept for compatibility */ 212#define FIBMAP _IO(0x00,1) /* bmap access */ 213#define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */ 214#define FIFREEZE _IOWR('X', 119, int) /* Freeze */ 215#define FITHAW _IOWR('X', 120, int) /* Thaw */ 216#define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */ 217#define FICLONE _IOW(0x94, 9, int) 218#define FICLONERANGE _IOW(0x94, 13, struct file_clone_range) 219#define FIDEDUPERANGE _IOWR(0x94, 54, struct file_dedupe_range) 220 221#define FSLABEL_MAX 256 /* Max chars for the interface; each fs may differ */ 222 223#define FS_IOC_GETFLAGS _IOR('f', 1, long) 224#define FS_IOC_SETFLAGS _IOW('f', 2, long) 225#define FS_IOC_GETVERSION _IOR('v', 1, long) 226#define FS_IOC_SETVERSION _IOW('v', 2, long) 227#define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap) 228#define FS_IOC32_GETFLAGS _IOR('f', 1, int) 229#define FS_IOC32_SETFLAGS _IOW('f', 2, int) 230#define FS_IOC32_GETVERSION _IOR('v', 1, int) 231#define FS_IOC32_SETVERSION _IOW('v', 2, int) 232#define FS_IOC_FSGETXATTR _IOR('X', 31, struct fsxattr) 233#define FS_IOC_FSSETXATTR _IOW('X', 32, struct fsxattr) 234#define FS_IOC_GETFSLABEL _IOR(0x94, 49, char[FSLABEL_MAX]) 235#define FS_IOC_SETFSLABEL _IOW(0x94, 50, char[FSLABEL_MAX]) 236/* Returns the external filesystem UUID, the same one blkid returns */ 237#define FS_IOC_GETFSUUID _IOR(0x15, 0, struct fsuuid2) 238/* 239 * Returns the path component under /sys/fs/ that refers to this filesystem; 240 * also /sys/kernel/debug/ for filesystems with debugfs exports 241 */ 242#define FS_IOC_GETFSSYSFSPATH _IOR(0x15, 1, struct fs_sysfs_path) 243 244/* 245 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS) 246 * 247 * Note: for historical reasons, these flags were originally used and 248 * defined for use by ext2/ext3, and then other file systems started 249 * using these flags so they wouldn't need to write their own version 250 * of chattr/lsattr (which was shipped as part of e2fsprogs). You 251 * should think twice before trying to use these flags in new 252 * contexts, or trying to assign these flags, since they are used both 253 * as the UAPI and the on-disk encoding for ext2/3/4. Also, we are 254 * almost out of 32-bit flags. :-) 255 * 256 * We have recently hoisted FS_IOC_FSGETXATTR / FS_IOC_FSSETXATTR from 257 * XFS to the generic FS level interface. This uses a structure that 258 * has padding and hence has more room to grow, so it may be more 259 * appropriate for many new use cases. 260 * 261 * Please do not change these flags or interfaces before checking with 262 * linux-fsdevel@vger.kernel.org and linux-api@vger.kernel.org. 263 */ 264#define FS_SECRM_FL 0x00000001 /* Secure deletion */ 265#define FS_UNRM_FL 0x00000002 /* Undelete */ 266#define FS_COMPR_FL 0x00000004 /* Compress file */ 267#define FS_SYNC_FL 0x00000008 /* Synchronous updates */ 268#define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */ 269#define FS_APPEND_FL 0x00000020 /* writes to file may only append */ 270#define FS_NODUMP_FL 0x00000040 /* do not dump file */ 271#define FS_NOATIME_FL 0x00000080 /* do not update atime */ 272/* Reserved for compression usage... */ 273#define FS_DIRTY_FL 0x00000100 274#define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 275#define FS_NOCOMP_FL 0x00000400 /* Don't compress */ 276/* End compression flags --- maybe not all used */ 277#define FS_ENCRYPT_FL 0x00000800 /* Encrypted file */ 278#define FS_BTREE_FL 0x00001000 /* btree format dir */ 279#define FS_INDEX_FL 0x00001000 /* hash-indexed directory */ 280#define FS_IMAGIC_FL 0x00002000 /* AFS directory */ 281#define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */ 282#define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 283#define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 284#define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 285#define FS_HUGE_FILE_FL 0x00040000 /* Reserved for ext4 */ 286#define FS_EXTENT_FL 0x00080000 /* Extents */ 287#define FS_VERITY_FL 0x00100000 /* Verity protected inode */ 288#define FS_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 289#define FS_EOFBLOCKS_FL 0x00400000 /* Reserved for ext4 */ 290#define FS_NOCOW_FL 0x00800000 /* Do not cow file */ 291#define FS_DAX_FL 0x02000000 /* Inode is DAX */ 292#define FS_INLINE_DATA_FL 0x10000000 /* Reserved for ext4 */ 293#define FS_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 294#define FS_CASEFOLD_FL 0x40000000 /* Folder is case insensitive */ 295#define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 296 297#define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */ 298#define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */ 299 300 301#define SYNC_FILE_RANGE_WAIT_BEFORE 1 302#define SYNC_FILE_RANGE_WRITE 2 303#define SYNC_FILE_RANGE_WAIT_AFTER 4 304#define SYNC_FILE_RANGE_WRITE_AND_WAIT (SYNC_FILE_RANGE_WRITE | \ 305 SYNC_FILE_RANGE_WAIT_BEFORE | \ 306 SYNC_FILE_RANGE_WAIT_AFTER) 307 308/* 309 * Flags for preadv2/pwritev2: 310 */ 311 312typedef int __bitwise __kernel_rwf_t; 313 314/* high priority request, poll if possible */ 315#define RWF_HIPRI ((__force __kernel_rwf_t)0x00000001) 316 317/* per-IO O_DSYNC */ 318#define RWF_DSYNC ((__force __kernel_rwf_t)0x00000002) 319 320/* per-IO O_SYNC */ 321#define RWF_SYNC ((__force __kernel_rwf_t)0x00000004) 322 323/* per-IO, return -EAGAIN if operation would block */ 324#define RWF_NOWAIT ((__force __kernel_rwf_t)0x00000008) 325 326/* per-IO O_APPEND */ 327#define RWF_APPEND ((__force __kernel_rwf_t)0x00000010) 328 329/* per-IO negation of O_APPEND */ 330#define RWF_NOAPPEND ((__force __kernel_rwf_t)0x00000020) 331 332/* mask of flags supported by the kernel */ 333#define RWF_SUPPORTED (RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT |\ 334 RWF_APPEND | RWF_NOAPPEND) 335 336/* Pagemap ioctl */ 337#define PAGEMAP_SCAN _IOWR('f', 16, struct pm_scan_arg) 338 339/* Bitmasks provided in pm_scan_args masks and reported in page_region.categories. */ 340#define PAGE_IS_WPALLOWED (1 << 0) 341#define PAGE_IS_WRITTEN (1 << 1) 342#define PAGE_IS_FILE (1 << 2) 343#define PAGE_IS_PRESENT (1 << 3) 344#define PAGE_IS_SWAPPED (1 << 4) 345#define PAGE_IS_PFNZERO (1 << 5) 346#define PAGE_IS_HUGE (1 << 6) 347#define PAGE_IS_SOFT_DIRTY (1 << 7) 348 349/* 350 * struct page_region - Page region with flags 351 * @start: Start of the region 352 * @end: End of the region (exclusive) 353 * @categories: PAGE_IS_* category bitmask for the region 354 */ 355struct page_region { 356 __u64 start; 357 __u64 end; 358 __u64 categories; 359}; 360 361/* Flags for PAGEMAP_SCAN ioctl */ 362#define PM_SCAN_WP_MATCHING (1 << 0) /* Write protect the pages matched. */ 363#define PM_SCAN_CHECK_WPASYNC (1 << 1) /* Abort the scan when a non-WP-enabled page is found. */ 364 365/* 366 * struct pm_scan_arg - Pagemap ioctl argument 367 * @size: Size of the structure 368 * @flags: Flags for the IOCTL 369 * @start: Starting address of the region 370 * @end: Ending address of the region 371 * @walk_end Address where the scan stopped (written by kernel). 372 * walk_end == end (address tags cleared) informs that the scan completed on entire range. 373 * @vec: Address of page_region struct array for output 374 * @vec_len: Length of the page_region struct array 375 * @max_pages: Optional limit for number of returned pages (0 = disabled) 376 * @category_inverted: PAGE_IS_* categories which values match if 0 instead of 1 377 * @category_mask: Skip pages for which any category doesn't match 378 * @category_anyof_mask: Skip pages for which no category matches 379 * @return_mask: PAGE_IS_* categories that are to be reported in `page_region`s returned 380 */ 381struct pm_scan_arg { 382 __u64 size; 383 __u64 flags; 384 __u64 start; 385 __u64 end; 386 __u64 walk_end; 387 __u64 vec; 388 __u64 vec_len; 389 __u64 max_pages; 390 __u64 category_inverted; 391 __u64 category_mask; 392 __u64 category_anyof_mask; 393 __u64 return_mask; 394}; 395 396#endif /* _UAPI_LINUX_FS_H */ 397