1 #ifndef _UAPI_LINUX_FS_H
2 #define _UAPI_LINUX_FS_H
5 * This file has definitions for some important file table
9 #include <linux/limits.h>
10 #include <linux/ioctl.h>
11 #include <linux/types.h>
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.
19 * Some programs (notably those using select()) may have to be
20 * recompiled to take full advantage of the new limits..
23 /* Fixed constants first: */
25 #define INR_OPEN_CUR 1024 /* Initial setting for nfile rlimits */
26 #define INR_OPEN_MAX 4096 /* Hard limit for nfile rlimits */
28 #define BLOCK_SIZE_BITS 10
29 #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
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
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 */
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 */
55 struct inodes_stat_t
{
58 long dummy
[5]; /* padding for sysctl ABI compatibility */
62 #define NR_FILE 8192 /* this can well be larger on a larger system */
66 * These are the fs-independent mount-flags: up to 32 flags are supported
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 */
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 */
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)
102 * Superblock flags that can be altered by MS_REMOUNT
104 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION|\
108 * Old magic mount flag and mask
110 #define MS_MGC_VAL 0xC0ED0000
111 #define MS_MGC_MSK 0xffff0000
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. */
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 */
129 #define BLKPG _IO(0x12,105)/* See blkpg.h */
131 /* Some people are morons. Do not use sizeof! */
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. */
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)
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 */
163 #define FIDTRIM _IOWR('f', 128, struct fstrim_range) /* Deep discard trim */
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)
176 * File system encryption support
178 /* Policy provided via an ioctl on the topmost directory */
179 #define FS_KEY_DESCRIPTOR_SIZE 8
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
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
198 struct fscrypt_policy
{
200 __u8 contents_encryption_mode
;
201 __u8 filenames_encryption_mode
;
203 __u8 master_key_descriptor
[FS_KEY_DESCRIPTOR_SIZE
];
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)
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
214 /* Structure that userspace passes to the kernel keyring */
215 #define FS_MAX_KEY_SIZE 64
219 __u8 raw
[FS_MAX_KEY_SIZE
];
224 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
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 */
253 #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
254 #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
257 #define SYNC_FILE_RANGE_WAIT_BEFORE 1
258 #define SYNC_FILE_RANGE_WRITE 2
259 #define SYNC_FILE_RANGE_WAIT_AFTER 4
261 #endif /* _UAPI_LINUX_FS_H */