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