Linux Kernel  3.7.1
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fs.h
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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 struct fstrim_range {
42 };
43 
44 /* And dynamically-tunable limits and defaults: */
46  unsigned long nr_files; /* read only */
47  unsigned long nr_free_files; /* read only */
48  unsigned long max_files; /* tunable */
49 };
50 
51 struct 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 #define MS_NOSEC (1<<28)
90 #define MS_BORN (1<<29)
91 #define MS_ACTIVE (1<<30)
92 #define MS_NOUSER (1<<31)
93 
94 /*
95  * Superblock flags that can be altered by MS_REMOUNT
96  */
97 #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION)
98 
99 /*
100  * Old magic mount flag and mask
101  */
102 #define MS_MGC_VAL 0xC0ED0000
103 #define MS_MGC_MSK 0xffff0000
104 
105 /* the read-only stuff doesn't really belong here, but any other place is
106  probably as bad and I don't want to create yet another include file. */
108 #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
109 #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
110 #define BLKRRPART _IO(0x12,95) /* re-read partition table */
111 #define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
112 #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
113 #define BLKRASET _IO(0x12,98) /* set read ahead for block device */
114 #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
115 #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
116 #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
117 #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
118 #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
119 #define BLKSSZGET _IO(0x12,104)/* get block device sector size */
120 #if 0
121 #define BLKPG _IO(0x12,105)/* See blkpg.h */
122 
123 /* Some people are morons. Do not use sizeof! */
124 
125 #define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
126 #define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
127 /* This was here just to show that the number is taken -
128  probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
129 #endif
130 /* A jump here: 108-111 have been used for various private purposes. */
131 #define BLKBSZGET _IOR(0x12,112,size_t)
132 #define BLKBSZSET _IOW(0x12,113,size_t)
133 #define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
134 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
135 #define BLKTRACESTART _IO(0x12,116)
136 #define BLKTRACESTOP _IO(0x12,117)
137 #define BLKTRACETEARDOWN _IO(0x12,118)
138 #define BLKDISCARD _IO(0x12,119)
139 #define BLKIOMIN _IO(0x12,120)
140 #define BLKIOOPT _IO(0x12,121)
141 #define BLKALIGNOFF _IO(0x12,122)
142 #define BLKPBSZGET _IO(0x12,123)
143 #define BLKDISCARDZEROES _IO(0x12,124)
144 #define BLKSECDISCARD _IO(0x12,125)
145 #define BLKROTATIONAL _IO(0x12,126)
146 #define BLKZEROOUT _IO(0x12,127)
148 #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
149 #define FIBMAP _IO(0x00,1) /* bmap access */
150 #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
151 #define FIFREEZE _IOWR('X', 119, int) /* Freeze */
152 #define FITHAW _IOWR('X', 120, int) /* Thaw */
153 #define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */
155 #define FS_IOC_GETFLAGS _IOR('f', 1, long)
156 #define FS_IOC_SETFLAGS _IOW('f', 2, long)
157 #define FS_IOC_GETVERSION _IOR('v', 1, long)
158 #define FS_IOC_SETVERSION _IOW('v', 2, long)
159 #define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)
160 #define FS_IOC32_GETFLAGS _IOR('f', 1, int)
161 #define FS_IOC32_SETFLAGS _IOW('f', 2, int)
162 #define FS_IOC32_GETVERSION _IOR('v', 1, int)
163 #define FS_IOC32_SETVERSION _IOW('v', 2, int)
164 
165 /*
166  * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
167  */
168 #define FS_SECRM_FL 0x00000001 /* Secure deletion */
169 #define FS_UNRM_FL 0x00000002 /* Undelete */
170 #define FS_COMPR_FL 0x00000004 /* Compress file */
171 #define FS_SYNC_FL 0x00000008 /* Synchronous updates */
172 #define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
173 #define FS_APPEND_FL 0x00000020 /* writes to file may only append */
174 #define FS_NODUMP_FL 0x00000040 /* do not dump file */
175 #define FS_NOATIME_FL 0x00000080 /* do not update atime */
176 /* Reserved for compression usage... */
177 #define FS_DIRTY_FL 0x00000100
178 #define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
179 #define FS_NOCOMP_FL 0x00000400 /* Don't compress */
180 #define FS_ECOMPR_FL 0x00000800 /* Compression error */
181 /* End compression flags --- maybe not all used */
182 #define FS_BTREE_FL 0x00001000 /* btree format dir */
183 #define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
184 #define FS_IMAGIC_FL 0x00002000 /* AFS directory */
185 #define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
186 #define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
187 #define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
188 #define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
189 #define FS_EXTENT_FL 0x00080000 /* Extents */
190 #define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */
191 #define FS_NOCOW_FL 0x00800000 /* Do not cow file */
192 #define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
194 #define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
195 #define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
196 
198 #define SYNC_FILE_RANGE_WAIT_BEFORE 1
199 #define SYNC_FILE_RANGE_WRITE 2
200 #define SYNC_FILE_RANGE_WAIT_AFTER 4
201 
202 #endif /* _UAPI_LINUX_FS_H */