source: cmedia/trunk/Include/Linux/fs.h@ 355

Last change on this file since 355 was 354, checked in by stevenhl, 17 years ago

Import untested baseline cmedia sources, work products and binaries
Binaries and work products should be deleted from repository.
once new builds are verified to work.
File size: 8.5 KB
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1/* $Id: fs.h,v 1.1 2000/04/23 14:55:30 ktk Exp $ */
2
3#ifndef _LINUX_FS_H
4#define _LINUX_FS_H
5
6/*
7 * It's silly to have NR_OPEN bigger than NR_FILE, but you can change
8 * the file limit at runtime and only root can increase the per-process
9 * nr_file rlimit, so it's safe to set up a ridiculously high absolute
10 * upper limit on files-per-process.
11 *
12 * Some programs (notably those using select()) may have to be
13 * recompiled to take full advantage of the new limits..
14 */
15
16#include <linux/types.h>
17#include <linux/fcntl.h>
18#include <linux/signal.h>
19#include <linux/kdev_t.h>
20#include <linux/wait.h>
21#include <linux/list.h>
22#include <linux/dcache.h>
23#include <linux/vmalloc.h>
24#include <linux/tqueue.h>
25
26#define FALSE 0
27#define TRUE 1
28
29/* Fixed constants first: */
30#undef NR_OPEN
31#define NR_OPEN (1024*1024) /* Absolute upper limit on fd num */
32#define INR_OPEN 1024 /* Initial setting for nfile rlimits */
33
34#define BLOCK_SIZE_BITS 10
35#define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
36
37#include <asm/semaphore.h>
38#include <asm/bitops.h>
39
40#define NR_FILE 8192 /* this can well be larger on a larger system */
41#define NR_RESERVED_FILES 10 /* reserved for root */
42#define NR_SUPER 256
43
44#define MAY_EXEC 1
45#define MAY_WRITE 2
46#define MAY_READ 4
47
48#define FMODE_READ 1
49#define FMODE_WRITE 2
50
51#define READ 0
52#define WRITE 1
53#define READA 2 /* read-ahead - don't block if no resources */
54
55#define WRITERAW 5 /* raw write - don't play with buffer lists */
56
57#ifndef NULL
58#define NULL ((void *) 0)
59#endif
60
61#define NIL_FILP ((struct file *)0)
62#define SEL_IN 1
63#define SEL_OUT 2
64#define SEL_EX 4
65
66/* public flags for file_system_type */
67#define FS_REQUIRES_DEV 1
68#define FS_NO_DCACHE 2 /* Only dcache the necessary things. */
69#define FS_NO_PRELIM 4 /* prevent preloading of dentries, even if
70 * FS_NO_DCACHE is not set.
71 */
72#define FS_IBASKET 8 /* FS does callback to free_ibasket() if space gets low. */
73
74/*
75 * These are the fs-independent mount-flags: up to 16 flags are supported
76 */
77#define MS_RDONLY 1 /* Mount read-only */
78#define MS_NOSUID 2 /* Ignore suid and sgid bits */
79#define MS_NODEV 4 /* Disallow access to device special files */
80#define MS_NOEXEC 8 /* Disallow program execution */
81#define MS_SYNCHRONOUS 16 /* Writes are synced at once */
82#define MS_REMOUNT 32 /* Alter flags of a mounted FS */
83#define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
84#define S_QUOTA 128 /* Quota initialized for file/directory/symlink */
85#define S_APPEND 256 /* Append-only file */
86#define S_IMMUTABLE 512 /* Immutable file */
87#define MS_NOATIME 1024 /* Do not update access times. */
88#define MS_NODIRATIME 2048 /* Do not update directory access times */
89
90#define MS_ODD_RENAME 32768 /* Temporary stuff; will go away as soon
91 * as nfs_rename() will be cleaned up
92 */
93
94/*
95 * Flags that can be altered by MS_REMOUNT
96 */
97#define MS_RMT_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|\
98 MS_SYNCHRONOUS|MS_MANDLOCK|MS_NOATIME|MS_NODIRATIME)
99
100/*
101 * Magic mount flag number. Has to be or-ed to the flag values.
102 */
103#define MS_MGC_VAL 0xC0ED0000 /* magic flag number to indicate "new" flags */
104#define MS_MGC_MSK 0xffff0000 /* magic flag number mask */
105
106/*
107 * Note that nosuid etc flags are inode-specific: setting some file-system
108 * flags just means all the inodes inherit those flags by default. It might be
109 * possible to override it selectively if you really wanted to with some
110 * ioctl() that is not currently implemented.
111 *
112 * Exception: MS_RDONLY is always applied to the entire file system.
113 *
114 * Unfortunately, it is possible to change a filesystems flags with it mounted
115 * with files in use. This means that all of the inodes will not have their
116 * i_flags updated. Hence, i_flags no longer inherit the superblock mount
117 * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
118 */
119#define __IS_FLG(inode,flg) (((inode)->i_sb && (inode)->i_sb->s_flags & (flg)) \
120 || (inode)->i_flags & (flg))
121
122#define IS_RDONLY(inode) (((inode)->i_sb) && ((inode)->i_sb->s_flags & MS_RDONLY))
123#define IS_NOSUID(inode) __IS_FLG(inode, MS_NOSUID)
124#define IS_NODEV(inode) __IS_FLG(inode, MS_NODEV)
125#define IS_NOEXEC(inode) __IS_FLG(inode, MS_NOEXEC)
126#define IS_SYNC(inode) __IS_FLG(inode, MS_SYNCHRONOUS)
127#define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
128
129#define IS_QUOTAINIT(inode) ((inode)->i_flags & S_QUOTA)
130#define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
131#define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
132#define IS_NOATIME(inode) __IS_FLG(inode, MS_NOATIME)
133#define IS_NODIRATIME(inode) __IS_FLG(inode, MS_NODIRATIME)
134
135
136/* the read-only stuff doesn't really belong here, but any other place is
137 probably as bad and I don't want to create yet another include file. */
138
139#define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
140#define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
141#define BLKRRPART _IO(0x12,95) /* re-read partition table */
142#define BLKGETSIZE _IO(0x12,96) /* return device size */
143#define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
144#define BLKRASET _IO(0x12,98) /* Set read ahead for block device */
145#define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
146#define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
147#define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
148#define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
149#define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
150#define BLKSSZGET _IO(0x12,104)/* get block device sector size */
151#if 0
152#define BLKPG _IO(0x12,105)/* See blkpg.h */
153/* This was here just to show that the number is taken -
154 probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
155#endif
156
157
158#define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
159#define FIBMAP _IO(0x00,1) /* bmap access */
160#define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
161
162struct fown_struct {
163 int pid; /* pid or -pgrp where SIGIO should be sent */
164 uid_t uid, euid; /* uid/euid of process setting the owner */
165 int signum; /* posix.1b rt signal to be delivered on IO */
166};
167
168struct file {
169 void * f_list;
170 struct dentry *f_dentry;
171 struct file_operations *f_op;
172 atomic_t f_count;
173 unsigned int f_flags;
174 mode_t f_mode;
175 loff_t f_pos;
176 unsigned long f_reada, f_ramax, f_raend, f_ralen, f_rawin;
177 struct fown_struct f_owner;
178 unsigned int f_uid, f_gid;
179 int f_error;
180
181 unsigned long f_version;
182
183 /* needed for tty driver, and maybe others */
184 void *private_data;
185};
186
187struct inode {
188#ifdef TARGET_OS2
189 kdev_t i_rdev;
190 struct semaphore i_sem;
191#else
192 void * i_hash;
193 void * i_list;
194 void * i_dentry;
195 unsigned long i_ino;
196 unsigned int i_count;
197 kdev_t i_dev;
198 umode_t i_mode;
199 nlink_t i_nlink;
200 uid_t i_uid;
201 gid_t i_gid;
202 kdev_t i_rdev;
203 loff_t i_size;
204 time_t i_atime;
205 time_t i_mtime;
206 time_t i_ctime;
207 unsigned long i_blksize;
208 unsigned long i_blocks;
209 unsigned long i_version;
210 struct semaphore i_sem;
211 struct inode_operations *i_op;
212 struct super_block *i_sb;
213 struct file_lock *i_flock;
214 struct vm_area_struct *i_mmap;
215 struct pipe_inode_info *i_pipe;
216 unsigned long i_state;
217
218 unsigned int i_flags;
219 unsigned char i_sock;
220
221 atomic_t i_writecount;
222 unsigned int i_attr_flags;
223 __u32 i_generation;
224 union {
225 void *generic_ip;
226 } u;
227#endif
228};
229
230typedef int (*filldir_t)(void *, const char *, int, off_t, ino_t);
231
232struct file_operations {
233 loff_t (*llseek) (struct file *, loff_t, int);
234 int (*read) (struct file *, char *, size_t, loff_t *);
235 int (*write) (struct file *, const char *, size_t, loff_t *);
236 int (*readdir) (struct file *, void *, filldir_t);
237 unsigned int (*poll) (struct file *, struct poll_table_struct *);
238 int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
239 int (*mmap) (struct file *, struct vm_area_struct *);
240 int (*open) (struct inode *, struct file *);
241 int (*flush) (struct file *);
242 int (*release) (struct inode *, struct file *);
243 int (*fsync) (struct file *, struct dentry *);
244 int (*fasync) (int, struct file *, int);
245 int (*check_media_change) (kdev_t dev);
246 int (*revalidate) (kdev_t dev);
247 int (*lock) (struct file *, int, struct file_lock *);
248};
249
250/* Inode state bits.. */
251#define I_DIRTY 1
252#define I_LOCK 2
253#define I_FREEING 4
254
255#include <linux/poll.h>
256
257#endif /* _LINUX_FS_H */
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