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