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 54 struct file_clone_range { 55 __s64 src_fd; 56 __u64 src_offset; 57 __u64 src_length; 58 __u64 dest_offset; 59 }; 60 61 struct fstrim_range { 62 __u64 start; 63 __u64 len; 64 __u64 minlen; 65 }; 66 67 /* extent-same (dedupe) ioctls; these MUST match the btrfs ioctl definitions */ 68 #define FILE_DEDUPE_RANGE_SAME 0 69 #define FILE_DEDUPE_RANGE_DIFFERS 1 70 71 /* from struct btrfs_ioctl_file_extent_same_info */ 72 struct file_dedupe_range_info { 73 __s64 dest_fd; /* in - destination file */ 74 __u64 dest_offset; /* in - start of extent in destination */ 75 __u64 bytes_deduped; /* out - total # of bytes we were able 76 * to dedupe from this file. */ 77 /* status of this dedupe operation: 78 * < 0 for error 79 * == FILE_DEDUPE_RANGE_SAME if dedupe succeeds 80 * == FILE_DEDUPE_RANGE_DIFFERS if data differs 81 */ 82 __s32 status; /* out - see above description */ 83 __u32 reserved; /* must be zero */ 84 }; 85 86 /* from struct btrfs_ioctl_file_extent_same_args */ 87 struct file_dedupe_range { 88 __u64 src_offset; /* in - start of extent in source */ 89 __u64 src_length; /* in - length of extent */ 90 __u16 dest_count; /* in - total elements in info array */ 91 __u16 reserved1; /* must be zero */ 92 __u32 reserved2; /* must be zero */ 93 struct file_dedupe_range_info info[]; 94 }; 95 96 /* And dynamically-tunable limits and defaults: */ 97 struct files_stat_struct { 98 unsigned long nr_files; /* read only */ 99 unsigned long nr_free_files; /* read only */ 100 unsigned long max_files; /* tunable */ 101 }; 102 103 struct inodes_stat_t { 104 long nr_inodes; 105 long nr_unused; 106 long dummy[5]; /* padding for sysctl ABI compatibility */ 107 }; 108 109 110 #define NR_FILE 8192 /* this can well be larger on a larger system */ 111 112 /* 113 * Structure for FS_IOC_FSGETXATTR[A] and FS_IOC_FSSETXATTR. 114 */ 115 struct fsxattr { 116 __u32 fsx_xflags; /* xflags field value (get/set) */ 117 __u32 fsx_extsize; /* extsize field value (get/set)*/ 118 __u32 fsx_nextents; /* nextents field value (get) */ 119 __u32 fsx_projid; /* project identifier (get/set) */ 120 __u32 fsx_cowextsize; /* CoW extsize field value (get/set)*/ 121 unsigned char fsx_pad[8]; 122 }; 123 124 /* 125 * Flags for the fsx_xflags field 126 */ 127 #define FS_XFLAG_REALTIME 0x00000001 /* data in realtime volume */ 128 #define FS_XFLAG_PREALLOC 0x00000002 /* preallocated file extents */ 129 #define FS_XFLAG_IMMUTABLE 0x00000008 /* file cannot be modified */ 130 #define FS_XFLAG_APPEND 0x00000010 /* all writes append */ 131 #define FS_XFLAG_SYNC 0x00000020 /* all writes synchronous */ 132 #define FS_XFLAG_NOATIME 0x00000040 /* do not update access time */ 133 #define FS_XFLAG_NODUMP 0x00000080 /* do not include in backups */ 134 #define FS_XFLAG_RTINHERIT 0x00000100 /* create with rt bit set */ 135 #define FS_XFLAG_PROJINHERIT 0x00000200 /* create with parents projid */ 136 #define FS_XFLAG_NOSYMLINKS 0x00000400 /* disallow symlink creation */ 137 #define FS_XFLAG_EXTSIZE 0x00000800 /* extent size allocator hint */ 138 #define FS_XFLAG_EXTSZINHERIT 0x00001000 /* inherit inode extent size */ 139 #define FS_XFLAG_NODEFRAG 0x00002000 /* do not defragment */ 140 #define FS_XFLAG_FILESTREAM 0x00004000 /* use filestream allocator */ 141 #define FS_XFLAG_DAX 0x00008000 /* use DAX for IO */ 142 #define FS_XFLAG_COWEXTSIZE 0x00010000 /* CoW extent size allocator hint */ 143 #define FS_XFLAG_HASATTR 0x80000000 /* no DIFLAG for this */ 144 145 /* the read-only stuff doesn't really belong here, but any other place is 146 probably as bad and I don't want to create yet another include file. */ 147 148 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */ 149 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */ 150 #define BLKRRPART _IO(0x12,95) /* re-read partition table */ 151 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */ 152 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */ 153 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */ 154 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */ 155 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */ 156 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */ 157 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */ 158 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */ 159 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */ 160 #if 0 161 #define BLKPG _IO(0x12,105)/* See blkpg.h */ 162 163 /* Some people are morons. Do not use sizeof! */ 164 165 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */ 166 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */ 167 /* This was here just to show that the number is taken - 168 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */ 169 #endif 170 /* A jump here: 108-111 have been used for various private purposes. */ 171 #define BLKBSZGET _IOR(0x12,112,size_t) 172 #define BLKBSZSET _IOW(0x12,113,size_t) 173 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */ 174 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup) 175 #define BLKTRACESTART _IO(0x12,116) 176 #define BLKTRACESTOP _IO(0x12,117) 177 #define BLKTRACETEARDOWN _IO(0x12,118) 178 #define BLKDISCARD _IO(0x12,119) 179 #define BLKIOMIN _IO(0x12,120) 180 #define BLKIOOPT _IO(0x12,121) 181 #define BLKALIGNOFF _IO(0x12,122) 182 #define BLKPBSZGET _IO(0x12,123) 183 #define BLKDISCARDZEROES _IO(0x12,124) 184 #define BLKSECDISCARD _IO(0x12,125) 185 #define BLKROTATIONAL _IO(0x12,126) 186 #define BLKZEROOUT _IO(0x12,127) 187 #define BLKGETDISKSEQ _IOR(0x12,128,__u64) 188 /* 189 * A jump here: 130-136 are reserved for zoned block devices 190 * (see uapi/linux/blkzoned.h) 191 */ 192 193 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */ 194 #define FIBMAP _IO(0x00,1) /* bmap access */ 195 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */ 196 #define FIFREEZE _IOWR('X', 119, int) /* Freeze */ 197 #define FITHAW _IOWR('X', 120, int) /* Thaw */ 198 #define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */ 199 #define FICLONE _IOW(0x94, 9, int) 200 #define FICLONERANGE _IOW(0x94, 13, struct file_clone_range) 201 #define FIDEDUPERANGE _IOWR(0x94, 54, struct file_dedupe_range) 202 203 #define FSLABEL_MAX 256 /* Max chars for the interface; each fs may differ */ 204 205 #define FS_IOC_GETFLAGS _IOR('f', 1, long) 206 #define FS_IOC_SETFLAGS _IOW('f', 2, long) 207 #define FS_IOC_GETVERSION _IOR('v', 1, long) 208 #define FS_IOC_SETVERSION _IOW('v', 2, long) 209 #define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap) 210 #define FS_IOC32_GETFLAGS _IOR('f', 1, int) 211 #define FS_IOC32_SETFLAGS _IOW('f', 2, int) 212 #define FS_IOC32_GETVERSION _IOR('v', 1, int) 213 #define FS_IOC32_SETVERSION _IOW('v', 2, int) 214 #define FS_IOC_FSGETXATTR _IOR('X', 31, struct fsxattr) 215 #define FS_IOC_FSSETXATTR _IOW('X', 32, struct fsxattr) 216 #define FS_IOC_GETFSLABEL _IOR(0x94, 49, char[FSLABEL_MAX]) 217 #define FS_IOC_SETFSLABEL _IOW(0x94, 50, char[FSLABEL_MAX]) 218 219 /* 220 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS) 221 * 222 * Note: for historical reasons, these flags were originally used and 223 * defined for use by ext2/ext3, and then other file systems started 224 * using these flags so they wouldn't need to write their own version 225 * of chattr/lsattr (which was shipped as part of e2fsprogs). You 226 * should think twice before trying to use these flags in new 227 * contexts, or trying to assign these flags, since they are used both 228 * as the UAPI and the on-disk encoding for ext2/3/4. Also, we are 229 * almost out of 32-bit flags. :-) 230 * 231 * We have recently hoisted FS_IOC_FSGETXATTR / FS_IOC_FSSETXATTR from 232 * XFS to the generic FS level interface. This uses a structure that 233 * has padding and hence has more room to grow, so it may be more 234 * appropriate for many new use cases. 235 * 236 * Please do not change these flags or interfaces before checking with 237 * linux-fsdevel@vger.kernel.org and linux-api@vger.kernel.org. 238 */ 239 #define FS_SECRM_FL 0x00000001 /* Secure deletion */ 240 #define FS_UNRM_FL 0x00000002 /* Undelete */ 241 #define FS_COMPR_FL 0x00000004 /* Compress file */ 242 #define FS_SYNC_FL 0x00000008 /* Synchronous updates */ 243 #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */ 244 #define FS_APPEND_FL 0x00000020 /* writes to file may only append */ 245 #define FS_NODUMP_FL 0x00000040 /* do not dump file */ 246 #define FS_NOATIME_FL 0x00000080 /* do not update atime */ 247 /* Reserved for compression usage... */ 248 #define FS_DIRTY_FL 0x00000100 249 #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 250 #define FS_NOCOMP_FL 0x00000400 /* Don't compress */ 251 /* End compression flags --- maybe not all used */ 252 #define FS_ENCRYPT_FL 0x00000800 /* Encrypted file */ 253 #define FS_BTREE_FL 0x00001000 /* btree format dir */ 254 #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */ 255 #define FS_IMAGIC_FL 0x00002000 /* AFS directory */ 256 #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */ 257 #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 258 #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 259 #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 260 #define FS_HUGE_FILE_FL 0x00040000 /* Reserved for ext4 */ 261 #define FS_EXTENT_FL 0x00080000 /* Extents */ 262 #define FS_VERITY_FL 0x00100000 /* Verity protected inode */ 263 #define FS_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 264 #define FS_EOFBLOCKS_FL 0x00400000 /* Reserved for ext4 */ 265 #define FS_NOCOW_FL 0x00800000 /* Do not cow file */ 266 #define FS_DAX_FL 0x02000000 /* Inode is DAX */ 267 #define FS_INLINE_DATA_FL 0x10000000 /* Reserved for ext4 */ 268 #define FS_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ 269 #define FS_CASEFOLD_FL 0x40000000 /* Folder is case insensitive */ 270 #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 271 272 #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */ 273 #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */ 274 275 276 #define SYNC_FILE_RANGE_WAIT_BEFORE 1 277 #define SYNC_FILE_RANGE_WRITE 2 278 #define SYNC_FILE_RANGE_WAIT_AFTER 4 279 #define SYNC_FILE_RANGE_WRITE_AND_WAIT (SYNC_FILE_RANGE_WRITE | \ 280 SYNC_FILE_RANGE_WAIT_BEFORE | \ 281 SYNC_FILE_RANGE_WAIT_AFTER) 282 283 /* 284 * Flags for preadv2/pwritev2: 285 */ 286 287 typedef int __bitwise __kernel_rwf_t; 288 289 /* high priority request, poll if possible */ 290 #define RWF_HIPRI ((__force __kernel_rwf_t)0x00000001) 291 292 /* per-IO O_DSYNC */ 293 #define RWF_DSYNC ((__force __kernel_rwf_t)0x00000002) 294 295 /* per-IO O_SYNC */ 296 #define RWF_SYNC ((__force __kernel_rwf_t)0x00000004) 297 298 /* per-IO, return -EAGAIN if operation would block */ 299 #define RWF_NOWAIT ((__force __kernel_rwf_t)0x00000008) 300 301 /* per-IO O_APPEND */ 302 #define RWF_APPEND ((__force __kernel_rwf_t)0x00000010) 303 304 /* mask of flags supported by the kernel */ 305 #define RWF_SUPPORTED (RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT |\ 306 RWF_APPEND) 307 308 #endif /* _UAPI_LINUX_FS_H */ 309