Linux kernel mirror (for testing)
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linux
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
38struct fstrim_range {
39 __u64 start;
40 __u64 len;
41 __u64 minlen;
42};
43
44/* And dynamically-tunable limits and defaults: */
45struct files_stat_struct {
46 unsigned long nr_files; /* read only */
47 unsigned long nr_free_files; /* read only */
48 unsigned long max_files; /* tunable */
49};
50
51struct inodes_stat_t {
52 int nr_inodes;
53 int nr_unused;
54 int dummy[5]; /* padding for sysctl ABI compatibility */
55};
56
57
58#define NR_FILE 8192 /* this can well be larger on a larger system */
59
60
61/*
62 * These are the fs-independent mount-flags: up to 32 flags are supported
63 */
64#define MS_RDONLY 1 /* Mount read-only */
65#define MS_NOSUID 2 /* Ignore suid and sgid bits */
66#define MS_NODEV 4 /* Disallow access to device special files */
67#define MS_NOEXEC 8 /* Disallow program execution */
68#define MS_SYNCHRONOUS 16 /* Writes are synced at once */
69#define MS_REMOUNT 32 /* Alter flags of a mounted FS */
70#define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
71#define MS_DIRSYNC 128 /* Directory modifications are synchronous */
72#define MS_NOATIME 1024 /* Do not update access times. */
73#define MS_NODIRATIME 2048 /* Do not update directory access times */
74#define MS_BIND 4096
75#define MS_MOVE 8192
76#define MS_REC 16384
77#define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
78 MS_VERBOSE is deprecated. */
79#define MS_SILENT 32768
80#define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
81#define MS_UNBINDABLE (1<<17) /* change to unbindable */
82#define MS_PRIVATE (1<<18) /* change to private */
83#define MS_SLAVE (1<<19) /* change to slave */
84#define MS_SHARED (1<<20) /* change to shared */
85#define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
86#define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */
87#define MS_I_VERSION (1<<23) /* Update inode I_version field */
88#define MS_STRICTATIME (1<<24) /* Always perform atime updates */
89
90/* These sb flags are internal to the kernel */
91#define MS_SNAP_STABLE (1<<27) /* Snapshot pages during writeback, if needed */
92#define MS_NOSEC (1<<28)
93#define MS_BORN (1<<29)
94#define MS_ACTIVE (1<<30)
95#define MS_NOUSER (1<<31)
96
97/*
98 * Superblock flags that can be altered by MS_REMOUNT
99 */
100#define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION)
101
102/*
103 * Old magic mount flag and mask
104 */
105#define MS_MGC_VAL 0xC0ED0000
106#define MS_MGC_MSK 0xffff0000
107
108/* the read-only stuff doesn't really belong here, but any other place is
109 probably as bad and I don't want to create yet another include file. */
110
111#define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
112#define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
113#define BLKRRPART _IO(0x12,95) /* re-read partition table */
114#define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
115#define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
116#define BLKRASET _IO(0x12,98) /* set read ahead for block device */
117#define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
118#define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
119#define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
120#define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
121#define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
122#define BLKSSZGET _IO(0x12,104)/* get block device sector size */
123#if 0
124#define BLKPG _IO(0x12,105)/* See blkpg.h */
125
126/* Some people are morons. Do not use sizeof! */
127
128#define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
129#define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
130/* This was here just to show that the number is taken -
131 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
132#endif
133/* A jump here: 108-111 have been used for various private purposes. */
134#define BLKBSZGET _IOR(0x12,112,size_t)
135#define BLKBSZSET _IOW(0x12,113,size_t)
136#define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
137#define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
138#define BLKTRACESTART _IO(0x12,116)
139#define BLKTRACESTOP _IO(0x12,117)
140#define BLKTRACETEARDOWN _IO(0x12,118)
141#define BLKDISCARD _IO(0x12,119)
142#define BLKIOMIN _IO(0x12,120)
143#define BLKIOOPT _IO(0x12,121)
144#define BLKALIGNOFF _IO(0x12,122)
145#define BLKPBSZGET _IO(0x12,123)
146#define BLKDISCARDZEROES _IO(0x12,124)
147#define BLKSECDISCARD _IO(0x12,125)
148#define BLKROTATIONAL _IO(0x12,126)
149#define BLKZEROOUT _IO(0x12,127)
150
151#define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
152#define FIBMAP _IO(0x00,1) /* bmap access */
153#define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
154#define FIFREEZE _IOWR('X', 119, int) /* Freeze */
155#define FITHAW _IOWR('X', 120, int) /* Thaw */
156#define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */
157
158#define FS_IOC_GETFLAGS _IOR('f', 1, long)
159#define FS_IOC_SETFLAGS _IOW('f', 2, long)
160#define FS_IOC_GETVERSION _IOR('v', 1, long)
161#define FS_IOC_SETVERSION _IOW('v', 2, long)
162#define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)
163#define FS_IOC32_GETFLAGS _IOR('f', 1, int)
164#define FS_IOC32_SETFLAGS _IOW('f', 2, int)
165#define FS_IOC32_GETVERSION _IOR('v', 1, int)
166#define FS_IOC32_SETVERSION _IOW('v', 2, int)
167
168/*
169 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
170 */
171#define FS_SECRM_FL 0x00000001 /* Secure deletion */
172#define FS_UNRM_FL 0x00000002 /* Undelete */
173#define FS_COMPR_FL 0x00000004 /* Compress file */
174#define FS_SYNC_FL 0x00000008 /* Synchronous updates */
175#define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
176#define FS_APPEND_FL 0x00000020 /* writes to file may only append */
177#define FS_NODUMP_FL 0x00000040 /* do not dump file */
178#define FS_NOATIME_FL 0x00000080 /* do not update atime */
179/* Reserved for compression usage... */
180#define FS_DIRTY_FL 0x00000100
181#define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
182#define FS_NOCOMP_FL 0x00000400 /* Don't compress */
183#define FS_ECOMPR_FL 0x00000800 /* Compression error */
184/* End compression flags --- maybe not all used */
185#define FS_BTREE_FL 0x00001000 /* btree format dir */
186#define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
187#define FS_IMAGIC_FL 0x00002000 /* AFS directory */
188#define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
189#define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
190#define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
191#define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
192#define FS_EXTENT_FL 0x00080000 /* Extents */
193#define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */
194#define FS_NOCOW_FL 0x00800000 /* Do not cow file */
195#define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
196
197#define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
198#define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
199
200
201#define SYNC_FILE_RANGE_WAIT_BEFORE 1
202#define SYNC_FILE_RANGE_WRITE 2
203#define SYNC_FILE_RANGE_WAIT_AFTER 4
204
205#endif /* _UAPI_LINUX_FS_H */