include/uapi/linux/fs.h

   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 /*
  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  */
  75 struct fsuuid2 {
  76         __u8    len;
  77         __u8    uuid[16];
  78 };
  79
  80 struct 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 */
  90 struct 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 */
 105 struct 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: */
 115 struct 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
 121 struct 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  */
 133 struct 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
 312 typedef 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  */
 355 struct 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  */
 381 struct 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 */