source: sbliveos2/trunk/include/linux/fs.h

Last change on this file was 142, checked in by ktk, 25 years ago

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[142]1/* $Id: fs.h 142 2000-04-23 14:55:46Z ktk $ */
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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