include/uapi/linux/fs.h

   1 #ifndef _UAPI_LINUX_FS_H
   2 #define _UAPI_LINUX_FS_H
   3
   4 /*
   5  * This file has definitions for some important file table
   6  * structures etc.
   7  */
   8
   9 #include <linux/limits.h>
  10 #include <linux/ioctl.h>
  11 #include <linux/types.h>
  12
  13 /*
  14  * It's silly to have NR_OPEN bigger than NR_FILE, but you can change
  15  * the file limit at runtime and only root can increase the per-process
  16  * nr_file rlimit, so it's safe to set up a ridiculously high absolute
  17  * upper limit on files-per-process.
  18  *
  19  * Some programs (notably those using select()) may have to be
  20  * recompiled to take full advantage of the new limits..
  21  */
  22
  23 /* Fixed constants first: */
  24 #undef NR_OPEN
  25 #define INR_OPEN_CUR 1024       /* Initial setting for nfile rlimits */
  26 #define INR_OPEN_MAX 4096       /* Hard limit for nfile rlimits */
  27
  28 #define BLOCK_SIZE_BITS 10
  29 #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
  30
  31 #define SEEK_SET        0       /* seek relative to beginning of file */
  32 #define SEEK_CUR        1       /* seek relative to current file position */
  33 #define SEEK_END        2       /* seek relative to end of file */
  34 #define SEEK_DATA       3       /* seek to the next data */
  35 #define SEEK_HOLE       4       /* seek to the next hole */
  36 #define SEEK_MAX        SEEK_HOLE
  37
  38 #define RENAME_NOREPLACE        (1 << 0)        /* Don't overwrite target */
  39 #define RENAME_EXCHANGE         (1 << 1)        /* Exchange source and dest */
  40 #define RENAME_WHITEOUT         (1 << 2)        /* Whiteout source */
  41
  42 struct fstrim_range {
  43         __u64 start;
  44         __u64 len;
  45         __u64 minlen;
  46 };
  47
  48 /* And dynamically-tunable limits and defaults: */
  49 struct files_stat_struct {
  50         unsigned long nr_files;         /* read only */
  51         unsigned long nr_free_files;    /* read only */
  52         unsigned long max_files;                /* tunable */
  53 };
  54
  55 struct inodes_stat_t {
  56         long nr_inodes;
  57         long nr_unused;
  58         long dummy[5];          /* padding for sysctl ABI compatibility */
  59 };
  60
  61 struct ci_lookup_data {
  62         char d[PATH_MAX];
  63 };
  64
  65 #define NR_FILE  8192   /* this can well be larger on a larger system */
  66
  67
  68 /*
  69  * These are the fs-independent mount-flags: up to 32 flags are supported
  70  */
  71 #define MS_RDONLY        1      /* Mount read-only */
  72 #define MS_NOSUID        2      /* Ignore suid and sgid bits */
  73 #define MS_NODEV         4      /* Disallow access to device special files */
  74 #define MS_NOEXEC        8      /* Disallow program execution */
  75 #define MS_SYNCHRONOUS  16      /* Writes are synced at once */
  76 #define MS_REMOUNT      32      /* Alter flags of a mounted FS */
  77 #define MS_MANDLOCK     64      /* Allow mandatory locks on an FS */
  78 #define MS_DIRSYNC      128     /* Directory modifications are synchronous */
  79 #define MS_NOATIME      1024    /* Do not update access times. */
  80 #define MS_NODIRATIME   2048    /* Do not update directory access times */
  81 #define MS_BIND         4096
  82 #define MS_MOVE         8192
  83 #define MS_REC          16384
  84 #define MS_VERBOSE      32768   /* War is peace. Verbosity is silence.
  85                                    MS_VERBOSE is deprecated. */
  86 #define MS_SILENT       32768
  87 #define MS_POSIXACL     (1<<16) /* VFS does not apply the umask */
  88 #define MS_UNBINDABLE   (1<<17) /* change to unbindable */
  89 #define MS_PRIVATE      (1<<18) /* change to private */
  90 #define MS_SLAVE        (1<<19) /* change to slave */
  91 #define MS_SHARED       (1<<20) /* change to shared */
  92 #define MS_RELATIME     (1<<21) /* Update atime relative to mtime/ctime. */
  93 #define MS_KERNMOUNT    (1<<22) /* this is a kern_mount call */
  94 #define MS_I_VERSION    (1<<23) /* Update inode I_version field */
  95 #define MS_STRICTATIME  (1<<24) /* Always perform atime updates */
  96 #define MS_LAZYTIME     (1<<25) /* Update the on-disk [acm]times lazily */
  97
  98 /* These sb flags are internal to the kernel */
  99 #define MS_NOSEC        (1<<28)
 100 #define MS_BORN         (1<<29)
 101 #define MS_ACTIVE       (1<<30)
 102 #define MS_NOUSER       (1<<31)
 103
 104 /*
 105  * Superblock flags that can be altered by MS_REMOUNT
 106  */
 107 #define MS_RMT_MASK     (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION|\
 108                          MS_LAZYTIME)
 109
 110 /*
 111  * Old magic mount flag and mask
 112  */
 113 #define MS_MGC_VAL 0xC0ED0000
 114 #define MS_MGC_MSK 0xffff0000
 115
 116 /* the read-only stuff doesn't really belong here, but any other place is
 117    probably as bad and I don't want to create yet another include file. */
 118
 119 #define BLKROSET   _IO(0x12,93) /* set device read-only (0 = read-write) */
 120 #define BLKROGET   _IO(0x12,94) /* get read-only status (0 = read_write) */
 121 #define BLKRRPART  _IO(0x12,95) /* re-read partition table */
 122 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
 123 #define BLKFLSBUF  _IO(0x12,97) /* flush buffer cache */
 124 #define BLKRASET   _IO(0x12,98) /* set read ahead for block device */
 125 #define BLKRAGET   _IO(0x12,99) /* get current read ahead setting */
 126 #define BLKFRASET  _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
 127 #define BLKFRAGET  _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
 128 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
 129 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
 130 #define BLKSSZGET  _IO(0x12,104)/* get block device sector size */
 131 #if 0
 132 #define BLKPG      _IO(0x12,105)/* See blkpg.h */
 133
 134 /* Some people are morons.  Do not use sizeof! */
 135
 136 #define BLKELVGET  _IOR(0x12,106,size_t)/* elevator get */
 137 #define BLKELVSET  _IOW(0x12,107,size_t)/* elevator set */
 138 /* This was here just to show that the number is taken -
 139    probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
 140 #endif
 141 /* A jump here: 108-111 have been used for various private purposes. */
 142 #define BLKBSZGET  _IOR(0x12,112,size_t)
 143 #define BLKBSZSET  _IOW(0x12,113,size_t)
 144 #define BLKGETSIZE64 _IOR(0x12,114,size_t)      /* return device size in bytes (u64 *arg) */
 145 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
 146 #define BLKTRACESTART _IO(0x12,116)
 147 #define BLKTRACESTOP _IO(0x12,117)
 148 #define BLKTRACETEARDOWN _IO(0x12,118)
 149 #define BLKDISCARD _IO(0x12,119)
 150 #define BLKIOMIN _IO(0x12,120)
 151 #define BLKIOOPT _IO(0x12,121)
 152 #define BLKALIGNOFF _IO(0x12,122)
 153 #define BLKPBSZGET _IO(0x12,123)
 154 #define BLKDISCARDZEROES _IO(0x12,124)
 155 #define BLKSECDISCARD _IO(0x12,125)
 156 #define BLKROTATIONAL _IO(0x12,126)
 157 #define BLKZEROOUT _IO(0x12,127)
 158
 159 #define BMAP_IOCTL 1            /* obsolete - kept for compatibility */
 160 #define FIBMAP     _IO(0x00,1)  /* bmap access */
 161 #define FIGETBSZ   _IO(0x00,2)  /* get the block size used for bmap */
 162 #define FIFREEZE        _IOWR('X', 119, int)    /* Freeze */
 163 #define FITHAW          _IOWR('X', 120, int)    /* Thaw */
 164 #define FITRIM          _IOWR('X', 121, struct fstrim_range)    /* Trim */
 165
 166 #define FIDTRIM _IOWR('f', 128, struct fstrim_range)    /* Deep discard trim */
 167
 168 #define FS_IOC_GETFLAGS                 _IOR('f', 1, long)
 169 #define FS_IOC_SETFLAGS                 _IOW('f', 2, long)
 170 #define FS_IOC_GETVERSION               _IOR('v', 1, long)
 171 #define FS_IOC_SETVERSION               _IOW('v', 2, long)
 172 #define FS_IOC_FIEMAP                   _IOWR('f', 11, struct fiemap)
 173 #define FS_IOC32_GETFLAGS               _IOR('f', 1, int)
 174 #define FS_IOC32_SETFLAGS               _IOW('f', 2, int)
 175 #define FS_IOC32_GETVERSION             _IOR('v', 1, int)
 176 #define FS_IOC32_SETVERSION             _IOW('v', 2, int)
 177
 178 #define FS_IOC_INVAL_MAPPING            _IO('f', 13)    /* CONFIG_EPM FMP */
 179 #define FS_IOC_CI_LOOKUP                _IOWR('f', 15, struct ci_lookup_data)
 180 /*
 181  * File system encryption support
 182  */
 183 /* Policy provided via an ioctl on the topmost directory */
 184 #define FS_KEY_DESCRIPTOR_SIZE  8
 185
 186 #define FS_POLICY_FLAGS_PAD_4           0x00
 187 #define FS_POLICY_FLAGS_PAD_8           0x01
 188 #define FS_POLICY_FLAGS_PAD_16          0x02
 189 #define FS_POLICY_FLAGS_PAD_32          0x03
 190 #define FS_POLICY_FLAGS_PAD_MASK        0x03
 191 #define FS_POLICY_FLAGS_VALID           0x03
 192
 193 /* Encryption algorithms */
 194 #define FS_ENCRYPTION_MODE_INVALID              0
 195 #define FS_ENCRYPTION_MODE_AES_256_XTS          1
 196 #define FS_ENCRYPTION_MODE_AES_256_GCM          2
 197 #define FS_ENCRYPTION_MODE_AES_256_CBC          3
 198 #define FS_ENCRYPTION_MODE_AES_256_CTS          4
 199 #define FS_ENCRYPTION_MODE_AES_128_CBC          5
 200 #define FS_ENCRYPTION_MODE_AES_128_CTS          6
 201
 202
 203 struct fscrypt_policy {
 204         __u8 version;
 205         __u8 contents_encryption_mode;
 206         __u8 filenames_encryption_mode;
 207         __u8 flags;
 208         __u8 master_key_descriptor[FS_KEY_DESCRIPTOR_SIZE];
 209 } __packed;
 210
 211 #define FS_IOC_SET_ENCRYPTION_POLICY    _IOR('f', 19, struct fscrypt_policy)
 212 #define FS_IOC_GET_ENCRYPTION_PWSALT    _IOW('f', 20, __u8[16])
 213 #define FS_IOC_GET_ENCRYPTION_POLICY    _IOW('f', 21, struct fscrypt_policy)
 214
 215 /* Parameters for passing an encryption key into the kernel keyring */
 216 #define FS_KEY_DESC_PREFIX              "fscrypt:"
 217 #define FS_KEY_DESC_PREFIX_SIZE         8
 218
 219 /* Structure that userspace passes to the kernel keyring */
 220 #define FS_MAX_KEY_SIZE                 64
 221
 222 struct fscrypt_key {
 223         __u32 mode;
 224         __u8 raw[FS_MAX_KEY_SIZE];
 225         __u32 size;
 226 };
 227
 228 /*
 229  * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
 230  */
 231 #define FS_SECRM_FL                     0x00000001 /* Secure deletion */
 232 #define FS_UNRM_FL                      0x00000002 /* Undelete */
 233 #define FS_COMPR_FL                     0x00000004 /* Compress file */
 234 #define FS_SYNC_FL                      0x00000008 /* Synchronous updates */
 235 #define FS_IMMUTABLE_FL                 0x00000010 /* Immutable file */
 236 #define FS_APPEND_FL                    0x00000020 /* writes to file may only append */
 237 #define FS_NODUMP_FL                    0x00000040 /* do not dump file */
 238 #define FS_NOATIME_FL                   0x00000080 /* do not update atime */
 239 /* Reserved for compression usage... */
 240 #define FS_DIRTY_FL                     0x00000100
 241 #define FS_COMPRBLK_FL                  0x00000200 /* One or more compressed clusters */
 242 #define FS_NOCOMP_FL                    0x00000400 /* Don't compress */
 243 #define FS_ECOMPR_FL                    0x00000800 /* Compression error */
 244 /* End compression flags --- maybe not all used */
 245 #define FS_BTREE_FL                     0x00001000 /* btree format dir */
 246 #define FS_INDEX_FL                     0x00001000 /* hash-indexed directory */
 247 #define FS_IMAGIC_FL                    0x00002000 /* AFS directory */
 248 #define FS_JOURNAL_DATA_FL              0x00004000 /* Reserved for ext3 */
 249 #define FS_NOTAIL_FL                    0x00008000 /* file tail should not be merged */
 250 #define FS_DIRSYNC_FL                   0x00010000 /* dirsync behaviour (directories only) */
 251 #define FS_TOPDIR_FL                    0x00020000 /* Top of directory hierarchies*/
 252 #define FS_EXTENT_FL                    0x00080000 /* Extents */
 253 #define FS_DIRECTIO_FL                  0x00100000 /* Use direct i/o */
 254 #define FS_NOCOW_FL                     0x00800000 /* Do not cow file */
 255 #define FS_PROJINHERIT_FL               0x20000000 /* Create with parents projid */
 256 #define FS_RESERVED_FL                  0x80000000 /* reserved for ext2 lib */
 257
 258 #define FS_FL_USER_VISIBLE              0x0003DFFF /* User visible flags */
 259 #define FS_FL_USER_MODIFIABLE           0x000380FF /* User modifiable flags */
 260
 261
 262 #define SYNC_FILE_RANGE_WAIT_BEFORE     1
 263 #define SYNC_FILE_RANGE_WRITE           2
 264 #define SYNC_FILE_RANGE_WAIT_AFTER      4
 265
 266 #endif /* _UAPI_LINUX_FS_H */