source: GPL/include/linux/fs.h@ 18

Last change on this file since 18 was 18, checked in by vladest, 20 years ago

initial import
File size: 8.7 KB
Line 
1#ifndef _LINUX_FS_H
2#define _LINUX_FS_H
3
4/*
5 * It's silly to have NR_OPEN bigger than NR_FILE, but you can change
6 * the file limit at runtime and only root can increase the per-process
7 * nr_file rlimit, so it's safe to set up a ridiculously high absolute
8 * upper limit on files-per-process.
9 *
10 * Some programs (notably those using select()) may have to be
11 * recompiled to take full advantage of the new limits..
12 */
13
14#include <linux/types.h>
15#include <linux/fcntl.h>
16#include <linux/signal.h>
17#include <linux/kdev_t.h>
18#include <linux/wait.h>
19#include <linux/list.h>
20#include <linux/dcache.h>
21#include <linux/vmalloc.h>
22#include <linux/tqueue.h>
23
24#define FALSE 0
25#define TRUE 1
26
27/* Fixed constants first: */
28#undef NR_OPEN
29#define NR_OPEN (1024*1024) /* Absolute upper limit on fd num */
30#define INR_OPEN 1024 /* Initial setting for nfile rlimits */
31
32#define BLOCK_SIZE_BITS 10
33#define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
34
35#include <asm/semaphore.h>
36#include <asm/bitops.h>
37
38#define NR_FILE 8192 /* this can well be larger on a larger system */
39#define NR_RESERVED_FILES 10 /* reserved for root */
40#define NR_SUPER 256
41
42#define MAY_EXEC 1
43#define MAY_WRITE 2
44#define MAY_READ 4
45
46#define FMODE_READ 1
47#define FMODE_WRITE 2
48
49#define READ 0
50#define WRITE 1
51#define READA 2 /* read-ahead - don't block if no resources */
52
53#define WRITERAW 5 /* raw write - don't play with buffer lists */
54
55#ifndef NULL
56#define NULL ((void *) 0)
57#endif
58
59#define NIL_FILP ((struct file *)0)
60#define SEL_IN 1
61#define SEL_OUT 2
62#define SEL_EX 4
63
64/* public flags for file_system_type */
65#define FS_REQUIRES_DEV 1
66#define FS_NO_DCACHE 2 /* Only dcache the necessary things. */
67#define FS_NO_PRELIM 4 /* prevent preloading of dentries, even if
68 * FS_NO_DCACHE is not set.
69 */
70#define FS_IBASKET 8 /* FS does callback to free_ibasket() if space gets low. */
71
72/*
73 * These are the fs-independent mount-flags: up to 16 flags are supported
74 */
75#define MS_RDONLY 1 /* Mount read-only */
76#define MS_NOSUID 2 /* Ignore suid and sgid bits */
77#define MS_NODEV 4 /* Disallow access to device special files */
78#define MS_NOEXEC 8 /* Disallow program execution */
79#define MS_SYNCHRONOUS 16 /* Writes are synced at once */
80#define MS_REMOUNT 32 /* Alter flags of a mounted FS */
81#define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
82#define S_QUOTA 128 /* Quota initialized for file/directory/symlink */
83#define S_APPEND 256 /* Append-only file */
84#define S_IMMUTABLE 512 /* Immutable file */
85#define MS_NOATIME 1024 /* Do not update access times. */
86#define MS_NODIRATIME 2048 /* Do not update directory access times */
87
88#define MS_ODD_RENAME 32768 /* Temporary stuff; will go away as soon
89 * as nfs_rename() will be cleaned up
90 */
91
92/*
93 * Flags that can be altered by MS_REMOUNT
94 */
95#define MS_RMT_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|\
96 MS_SYNCHRONOUS|MS_MANDLOCK|MS_NOATIME|MS_NODIRATIME)
97
98/*
99 * Magic mount flag number. Has to be or-ed to the flag values.
100 */
101#define MS_MGC_VAL 0xC0ED0000 /* magic flag number to indicate "new" flags */
102#define MS_MGC_MSK 0xffff0000 /* magic flag number mask */
103
104/*
105 * Note that nosuid etc flags are inode-specific: setting some file-system
106 * flags just means all the inodes inherit those flags by default. It might be
107 * possible to override it selectively if you really wanted to with some
108 * ioctl() that is not currently implemented.
109 *
110 * Exception: MS_RDONLY is always applied to the entire file system.
111 *
112 * Unfortunately, it is possible to change a filesystems flags with it mounted
113 * with files in use. This means that all of the inodes will not have their
114 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
115 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
116 */
117#define __IS_FLG(inode,flg) (((inode)->i_sb && (inode)->i_sb->s_flags & (flg)) \
118 || (inode)->i_flags & (flg))
119
120#define IS_RDONLY(inode) (((inode)->i_sb) && ((inode)->i_sb->s_flags & MS_RDONLY))
121#define IS_NOSUID(inode) __IS_FLG(inode, MS_NOSUID)
122#define IS_NODEV(inode) __IS_FLG(inode, MS_NODEV)
123#define IS_NOEXEC(inode) __IS_FLG(inode, MS_NOEXEC)
124#define IS_SYNC(inode) __IS_FLG(inode, MS_SYNCHRONOUS)
125#define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
126
127#define IS_QUOTAINIT(inode) ((inode)->i_flags & S_QUOTA)
128#define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
129#define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
130#define IS_NOATIME(inode) __IS_FLG(inode, MS_NOATIME)
131#define IS_NODIRATIME(inode) __IS_FLG(inode, MS_NODIRATIME)
132
133
134/* the read-only stuff doesn't really belong here, but any other place is
135 probably as bad and I don't want to create yet another include file. */
136
137#define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
138#define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
139#define BLKRRPART _IO(0x12,95) /* re-read partition table */
140#define BLKGETSIZE _IO(0x12,96) /* return device size */
141#define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
142#define BLKRASET _IO(0x12,98) /* Set read ahead for block device */
143#define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
144#define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
145#define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
146#define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
147#define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
148#define BLKSSZGET _IO(0x12,104)/* get block device sector size */
149#if 0
150#define BLKPG _IO(0x12,105)/* See blkpg.h */
151/* This was here just to show that the number is taken -
152 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
153#endif
154
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
160struct fown_struct {
161 int pid; /* pid or -pgrp where SIGIO should be sent */
162 uid_t uid, euid; /* uid/euid of process setting the owner */
163 int signum; /* posix.1b rt signal to be delivered on IO */
164};
165
166struct file {
167 void * f_list;
168 struct dentry *f_dentry;
169 struct file_operations *f_op;
170 atomic_t f_count;
171 unsigned int f_flags;
172 mode_t f_mode;
173 loff_t f_pos;
174 unsigned long f_reada, f_ramax, f_raend, f_ralen, f_rawin;
175 struct fown_struct f_owner;
176 unsigned int f_uid, f_gid;
177 int f_error;
178
179 unsigned long f_version;
180
181 /* needed for tty driver, and maybe others */
182 void *private_data;
183};
184
185struct inode {
186#ifdef TARGET_OS2
187 kdev_t i_rdev;
188 struct semaphore i_sem;
189#else
190 void * i_hash;
191 void * i_list;
192 void * i_dentry;
193 unsigned long i_ino;
194 unsigned int i_count;
195 kdev_t i_dev;
196 umode_t i_mode;
197 nlink_t i_nlink;
198 uid_t i_uid;
199 gid_t i_gid;
200 kdev_t i_rdev;
201 loff_t i_size;
202 time_t i_atime;
203 time_t i_mtime;
204 time_t i_ctime;
205 unsigned long i_blksize;
206 unsigned long i_blocks;
207 unsigned long i_version;
208 struct semaphore i_sem;
209 struct inode_operations *i_op;
210 struct super_block *i_sb;
211 struct file_lock *i_flock;
212 struct vm_area_struct *i_mmap;
213 struct pipe_inode_info *i_pipe;
214 unsigned long i_state;
215
216 unsigned int i_flags;
217 unsigned char i_sock;
218
219 atomic_t i_writecount;
220 unsigned int i_attr_flags;
221 __u32 i_generation;
222 union {
223 void *generic_ip;
224 } u;
225#endif
226};
227
228typedef int (*filldir_t)(void *, const char *, int, off_t, ino_t);
229
230struct file_operations {
231 loff_t (*llseek) (struct file *, loff_t, int);
232 int (*read) (struct file *, char *, size_t, loff_t *);
233 int (*write) (struct file *, const char *, size_t, loff_t *);
234 int (*readdir) (struct file *, void *, filldir_t);
235 unsigned int (*poll) (struct file *, struct poll_table_struct *);
236 int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
237 int (*mmap) (struct file *, struct vm_area_struct *);
238 int (*open) (struct inode *, struct file *);
239 int (*flush) (struct file *);
240 int (*release) (struct inode *, struct file *);
241 int (*fsync) (struct file *, struct dentry *);
242 int (*fasync) (int, struct file *, int);
243 int (*check_media_change) (kdev_t dev);
244 int (*revalidate) (kdev_t dev);
245 int (*lock) (struct file *, int, struct file_lock *);
246};
247
248/* Inode state bits.. */
249#define I_DIRTY 1
250#define I_LOCK 2
251#define I_FREEING 4
252
253#include <linux/poll.h>
254
255
256extern int register_chrdev(unsigned int, const char *, struct file_operations *);
257extern int unregister_chrdev(unsigned int, const char *);
258
259extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
260extern void kill_fasync(struct fasync_struct *, int, int);
261
262#endif /* _LINUX_FS_H */
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