vfs: add whiteout support
[deliverable/linux.git] / include / uapi / linux / 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
0a7c3937 38#define RENAME_NOREPLACE (1 << 0) /* Don't overwrite target */
da1ce067 39#define RENAME_EXCHANGE (1 << 1) /* Exchange source and dest */
0a7c3937 40
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41struct fstrim_range {
42 __u64 start;
43 __u64 len;
44 __u64 minlen;
45};
46
47/* And dynamically-tunable limits and defaults: */
48struct files_stat_struct {
49 unsigned long nr_files; /* read only */
50 unsigned long nr_free_files; /* read only */
51 unsigned long max_files; /* tunable */
52};
53
54struct inodes_stat_t {
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55 long nr_inodes;
56 long nr_unused;
57 long dummy[5]; /* padding for sysctl ABI compatibility */
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58};
59
60
61#define NR_FILE 8192 /* this can well be larger on a larger system */
62
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63
64/*
65 * These are the fs-independent mount-flags: up to 32 flags are supported
66 */
67#define MS_RDONLY 1 /* Mount read-only */
68#define MS_NOSUID 2 /* Ignore suid and sgid bits */
69#define MS_NODEV 4 /* Disallow access to device special files */
70#define MS_NOEXEC 8 /* Disallow program execution */
71#define MS_SYNCHRONOUS 16 /* Writes are synced at once */
72#define MS_REMOUNT 32 /* Alter flags of a mounted FS */
73#define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
74#define MS_DIRSYNC 128 /* Directory modifications are synchronous */
75#define MS_NOATIME 1024 /* Do not update access times. */
76#define MS_NODIRATIME 2048 /* Do not update directory access times */
77#define MS_BIND 4096
78#define MS_MOVE 8192
79#define MS_REC 16384
80#define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
81 MS_VERBOSE is deprecated. */
82#define MS_SILENT 32768
83#define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
84#define MS_UNBINDABLE (1<<17) /* change to unbindable */
85#define MS_PRIVATE (1<<18) /* change to private */
86#define MS_SLAVE (1<<19) /* change to slave */
87#define MS_SHARED (1<<20) /* change to shared */
88#define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
89#define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */
90#define MS_I_VERSION (1<<23) /* Update inode I_version field */
91#define MS_STRICTATIME (1<<24) /* Always perform atime updates */
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92
93/* These sb flags are internal to the kernel */
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94#define MS_NOSEC (1<<28)
95#define MS_BORN (1<<29)
96#define MS_ACTIVE (1<<30)
97#define MS_NOUSER (1<<31)
98
99/*
100 * Superblock flags that can be altered by MS_REMOUNT
101 */
102#define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION)
103
104/*
105 * Old magic mount flag and mask
106 */
107#define MS_MGC_VAL 0xC0ED0000
108#define MS_MGC_MSK 0xffff0000
109
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110/* the read-only stuff doesn't really belong here, but any other place is
111 probably as bad and I don't want to create yet another include file. */
112
113#define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
114#define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
115#define BLKRRPART _IO(0x12,95) /* re-read partition table */
116#define BLKGETSIZE _IO(0x12,96) /* return device size /512 (long *arg) */
117#define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
118#define BLKRASET _IO(0x12,98) /* set read ahead for block device */
119#define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
120#define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
121#define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
122#define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
123#define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
124#define BLKSSZGET _IO(0x12,104)/* get block device sector size */
125#if 0
126#define BLKPG _IO(0x12,105)/* See blkpg.h */
127
128/* Some people are morons. Do not use sizeof! */
129
130#define BLKELVGET _IOR(0x12,106,size_t)/* elevator get */
131#define BLKELVSET _IOW(0x12,107,size_t)/* elevator set */
132/* This was here just to show that the number is taken -
133 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
134#endif
135/* A jump here: 108-111 have been used for various private purposes. */
136#define BLKBSZGET _IOR(0x12,112,size_t)
137#define BLKBSZSET _IOW(0x12,113,size_t)
138#define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
139#define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
140#define BLKTRACESTART _IO(0x12,116)
141#define BLKTRACESTOP _IO(0x12,117)
142#define BLKTRACETEARDOWN _IO(0x12,118)
143#define BLKDISCARD _IO(0x12,119)
144#define BLKIOMIN _IO(0x12,120)
145#define BLKIOOPT _IO(0x12,121)
146#define BLKALIGNOFF _IO(0x12,122)
147#define BLKPBSZGET _IO(0x12,123)
148#define BLKDISCARDZEROES _IO(0x12,124)
149#define BLKSECDISCARD _IO(0x12,125)
150#define BLKROTATIONAL _IO(0x12,126)
151#define BLKZEROOUT _IO(0x12,127)
152
153#define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
154#define FIBMAP _IO(0x00,1) /* bmap access */
155#define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
156#define FIFREEZE _IOWR('X', 119, int) /* Freeze */
157#define FITHAW _IOWR('X', 120, int) /* Thaw */
158#define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */
159
160#define FS_IOC_GETFLAGS _IOR('f', 1, long)
161#define FS_IOC_SETFLAGS _IOW('f', 2, long)
162#define FS_IOC_GETVERSION _IOR('v', 1, long)
163#define FS_IOC_SETVERSION _IOW('v', 2, long)
164#define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)
165#define FS_IOC32_GETFLAGS _IOR('f', 1, int)
166#define FS_IOC32_SETFLAGS _IOW('f', 2, int)
167#define FS_IOC32_GETVERSION _IOR('v', 1, int)
168#define FS_IOC32_SETVERSION _IOW('v', 2, int)
169
170/*
171 * Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
172 */
173#define FS_SECRM_FL 0x00000001 /* Secure deletion */
174#define FS_UNRM_FL 0x00000002 /* Undelete */
175#define FS_COMPR_FL 0x00000004 /* Compress file */
176#define FS_SYNC_FL 0x00000008 /* Synchronous updates */
177#define FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
178#define FS_APPEND_FL 0x00000020 /* writes to file may only append */
179#define FS_NODUMP_FL 0x00000040 /* do not dump file */
180#define FS_NOATIME_FL 0x00000080 /* do not update atime */
181/* Reserved for compression usage... */
182#define FS_DIRTY_FL 0x00000100
183#define FS_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
184#define FS_NOCOMP_FL 0x00000400 /* Don't compress */
185#define FS_ECOMPR_FL 0x00000800 /* Compression error */
186/* End compression flags --- maybe not all used */
187#define FS_BTREE_FL 0x00001000 /* btree format dir */
188#define FS_INDEX_FL 0x00001000 /* hash-indexed directory */
189#define FS_IMAGIC_FL 0x00002000 /* AFS directory */
190#define FS_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
191#define FS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
192#define FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
193#define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
194#define FS_EXTENT_FL 0x00080000 /* Extents */
195#define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */
196#define FS_NOCOW_FL 0x00800000 /* Do not cow file */
197#define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
198
199#define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
200#define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
201
202
203#define SYNC_FILE_RANGE_WAIT_BEFORE 1
204#define SYNC_FILE_RANGE_WRITE 2
205#define SYNC_FILE_RANGE_WAIT_AFTER 4
206
207#endif /* _UAPI_LINUX_FS_H */
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