411 lines
14 KiB
C
411 lines
14 KiB
C
#ifndef _LINUX_FS_H
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#define _LINUX_FS_H
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/*
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* This file has definitions for some important file table
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* structures etc.
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*/
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#include <linux/linkage.h>
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#include <linux/limits.h>
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#include <linux/wait.h>
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#include <linux/types.h>
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#include <linux/dirent.h>
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#include <linux/vfs.h>
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#include <linux/net.h>
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/*
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* It's silly to have NR_OPEN bigger than NR_FILE, but I'll fix
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* that later. Anyway, now the file code is no longer dependent
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* on bitmaps in unsigned longs, but uses the new fd_set structure..
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*
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* Some programs (notably those using select()) may have to be
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* recompiled to take full advantage of the new limits..
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*/
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#undef NR_OPEN
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#define NR_OPEN 256
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#define NR_INODE 2048 /* this should be bigger than NR_FILE */
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#define NR_FILE 1024 /* this can well be larger on a larger system */
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#define NR_SUPER 32
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#define NR_HASH 997
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#define NR_IHASH 131
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#define NR_FILE_LOCKS 64
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#define BLOCK_SIZE 1024
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#define BLOCK_SIZE_BITS 10
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#define MAY_EXEC 1
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#define MAY_WRITE 2
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#define MAY_READ 4
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#define READ 0
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#define WRITE 1
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#define READA 2 /* read-ahead - don't pause */
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#define WRITEA 3 /* "write-ahead" - silly, but somewhat useful */
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extern void buffer_init(void);
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extern unsigned long inode_init(unsigned long start, unsigned long end);
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extern unsigned long file_table_init(unsigned long start, unsigned long end);
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#define MAJOR(a) (int)((unsigned short)(a) >> 8)
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#define MINOR(a) (int)((unsigned short)(a) & 0xFF)
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#define MKDEV(a,b) ((int)((((a) & 0xff) << 8) | ((b) & 0xff)))
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#ifndef NULL
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#define NULL ((void *) 0)
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#endif
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#define NIL_FILP ((struct file *)0)
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#define SEL_IN 1
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#define SEL_OUT 2
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#define SEL_EX 4
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/*
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* These are the fs-independent mount-flags: up to 16 flags are supported
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*/
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#define MS_RDONLY 1 /* mount read-only */
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#define MS_NOSUID 2 /* ignore suid and sgid bits */
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#define MS_NODEV 4 /* disallow access to device special files */
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#define MS_NOEXEC 8 /* disallow program execution */
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#define MS_SYNC 16 /* writes are synced at once */
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#define MS_REMOUNT 32 /* alter flags of a mounted FS */
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/*
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* Flags that can be altered by MS_REMOUNT
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*/
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#define MS_RMT_MASK (MS_RDONLY)
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/*
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* Magic mount flag number. Has to be or-ed to the flag values.
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*/
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#define MS_MGC_VAL 0xC0ED0000 /* magic flag number to indicate "new" flags */
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#define MS_MGC_MSK 0xffff0000 /* magic flag number mask */
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/*
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* Note that read-only etc flags are inode-specific: setting some file-system
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* flags just means all the inodes inherit those flags by default. It might be
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* possible to overrride it sevelctively if you really wanted to with some
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* ioctl() that is not currently implemented.
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*
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* Exception: MS_RDONLY is always applied to the entire file system.
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*/
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#define IS_RDONLY(inode) (((inode)->i_sb) && ((inode)->i_sb->s_flags & MS_RDONLY))
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#define IS_NOSUID(inode) ((inode)->i_flags & MS_NOSUID)
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#define IS_NODEV(inode) ((inode)->i_flags & MS_NODEV)
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#define IS_NOEXEC(inode) ((inode)->i_flags & MS_NOEXEC)
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#define IS_SYNC(inode) ((inode)->i_flags & MS_SYNC)
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/* the read-only stuff doesn't really belong here, but any other place is
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probably as bad and I don't want to create yet another include file. */
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#define BLKROSET 4701 /* set device read-only (0 = read-write) */
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#define BLKROGET 4702 /* get read-only status (0 = read_write) */
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#define BLKRRPART 4703 /* re-read partition table */
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#define BLKGETSIZE 4704 /* return device size */
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#define BLKFLSBUF 4705 /* flush buffer cache */
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/* These are a few other constants only used by scsi devices */
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#define SCSI_IOCTL_GET_IDLUN 0x5382
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/* Used to turn on and off tagged queueing for scsi devices */
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#define SCSI_IOCTL_TAGGED_ENABLE 0x5383
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#define SCSI_IOCTL_TAGGED_DISABLE 0x5384
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#define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
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#define FIBMAP 1 /* bmap access */
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#define FIGETBSZ 2 /* get the block size used for bmap */
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/* these flags tell notify_change what is being changed */
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#define NOTIFY_SIZE 1
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#define NOTIFY_MODE 2
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#define NOTIFY_TIME 4
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#define NOTIFY_UIDGID 8
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typedef char buffer_block[BLOCK_SIZE];
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struct buffer_head {
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char * b_data; /* pointer to data block (1024 bytes) */
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unsigned long b_size; /* block size */
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unsigned long b_blocknr; /* block number */
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dev_t b_dev; /* device (0 = free) */
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unsigned short b_count; /* users using this block */
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unsigned char b_uptodate;
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unsigned char b_dirt; /* 0-clean,1-dirty */
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unsigned char b_lock; /* 0 - ok, 1 -locked */
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unsigned char b_req; /* 0 if the buffer has been invalidated */
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struct wait_queue * b_wait;
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struct buffer_head * b_prev; /* doubly linked list of hash-queue */
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struct buffer_head * b_next;
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struct buffer_head * b_prev_free; /* doubly linked list of buffers */
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struct buffer_head * b_next_free;
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struct buffer_head * b_this_page; /* circular list of buffers in one page */
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struct buffer_head * b_reqnext; /* request queue */
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};
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#include <linux/pipe_fs_i.h>
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#include <linux/minix_fs_i.h>
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#include <linux/ext_fs_i.h>
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#include <linux/ext2_fs_i.h>
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#include <linux/hpfs_fs_i.h>
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#include <linux/msdos_fs_i.h>
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#include <linux/iso_fs_i.h>
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#include <linux/nfs_fs_i.h>
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#include <linux/xia_fs_i.h>
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#include <linux/sysv_fs_i.h>
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struct inode {
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dev_t i_dev;
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unsigned long i_ino;
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umode_t i_mode;
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nlink_t i_nlink;
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uid_t i_uid;
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gid_t i_gid;
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dev_t i_rdev;
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off_t i_size;
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time_t i_atime;
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time_t i_mtime;
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time_t i_ctime;
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unsigned long i_blksize;
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unsigned long i_blocks;
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struct inode_operations * i_op;
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struct super_block * i_sb;
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struct wait_queue * i_wait;
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struct file_lock * i_flock;
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struct vm_area_struct * i_mmap;
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struct inode * i_next, * i_prev;
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struct inode * i_hash_next, * i_hash_prev;
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struct inode * i_bound_to, * i_bound_by;
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struct inode * i_mount;
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struct socket * i_socket;
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unsigned short i_count;
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unsigned short i_flags;
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unsigned char i_lock;
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unsigned char i_dirt;
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unsigned char i_pipe;
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unsigned char i_seek;
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unsigned char i_update;
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union {
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struct pipe_inode_info pipe_i;
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struct minix_inode_info minix_i;
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struct ext_inode_info ext_i;
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struct ext2_inode_info ext2_i;
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struct hpfs_inode_info hpfs_i;
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struct msdos_inode_info msdos_i;
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struct iso_inode_info isofs_i;
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struct nfs_inode_info nfs_i;
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struct xiafs_inode_info xiafs_i;
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struct sysv_inode_info sysv_i;
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} u;
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};
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struct file {
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mode_t f_mode;
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dev_t f_rdev; /* needed for /dev/tty */
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off_t f_pos;
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unsigned short f_flags;
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unsigned short f_count;
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unsigned short f_reada;
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struct file *f_next, *f_prev;
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struct inode * f_inode;
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struct file_operations * f_op;
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};
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struct file_lock {
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struct file_lock *fl_next; /* singly linked list */
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struct task_struct *fl_owner; /* NULL if on free list, for sanity checks */
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unsigned int fl_fd; /* File descriptor for this lock */
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struct wait_queue *fl_wait;
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char fl_type;
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char fl_whence;
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off_t fl_start;
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off_t fl_end;
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};
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#include <linux/minix_fs_sb.h>
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#include <linux/ext_fs_sb.h>
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#include <linux/ext2_fs_sb.h>
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#include <linux/hpfs_fs_sb.h>
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#include <linux/msdos_fs_sb.h>
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#include <linux/iso_fs_sb.h>
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#include <linux/nfs_fs_sb.h>
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#include <linux/xia_fs_sb.h>
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#include <linux/sysv_fs_sb.h>
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struct super_block {
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dev_t s_dev;
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unsigned long s_blocksize;
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unsigned char s_blocksize_bits;
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unsigned char s_lock;
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unsigned char s_rd_only;
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unsigned char s_dirt;
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struct super_operations *s_op;
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unsigned long s_flags;
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unsigned long s_magic;
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unsigned long s_time;
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struct inode * s_covered;
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struct inode * s_mounted;
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struct wait_queue * s_wait;
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union {
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struct minix_sb_info minix_sb;
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struct ext_sb_info ext_sb;
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struct ext2_sb_info ext2_sb;
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struct hpfs_sb_info hpfs_sb;
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struct msdos_sb_info msdos_sb;
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struct isofs_sb_info isofs_sb;
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struct nfs_sb_info nfs_sb;
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struct xiafs_sb_info xiafs_sb;
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struct sysv_sb_info sysv_sb;
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} u;
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};
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struct file_operations {
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int (*lseek) (struct inode *, struct file *, off_t, int);
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int (*read) (struct inode *, struct file *, char *, int);
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int (*write) (struct inode *, struct file *, char *, int);
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int (*readdir) (struct inode *, struct file *, struct dirent *, int);
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int (*select) (struct inode *, struct file *, int, select_table *);
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int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
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int (*mmap) (struct inode *, struct file *, unsigned long, size_t, int, unsigned long);
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int (*open) (struct inode *, struct file *);
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void (*release) (struct inode *, struct file *);
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int (*fsync) (struct inode *, struct file *);
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};
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struct inode_operations {
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struct file_operations * default_file_ops;
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int (*create) (struct inode *,const char *,int,int,struct inode **);
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int (*lookup) (struct inode *,const char *,int,struct inode **);
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int (*link) (struct inode *,struct inode *,const char *,int);
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int (*unlink) (struct inode *,const char *,int);
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int (*symlink) (struct inode *,const char *,int,const char *);
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int (*mkdir) (struct inode *,const char *,int,int);
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int (*rmdir) (struct inode *,const char *,int);
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int (*mknod) (struct inode *,const char *,int,int,int);
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int (*rename) (struct inode *,const char *,int,struct inode *,const char *,int);
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int (*readlink) (struct inode *,char *,int);
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int (*follow_link) (struct inode *,struct inode *,int,int,struct inode **);
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int (*bmap) (struct inode *,int);
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void (*truncate) (struct inode *);
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int (*permission) (struct inode *, int);
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};
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struct super_operations {
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void (*read_inode) (struct inode *);
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int (*notify_change) (int flags, struct inode *);
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void (*write_inode) (struct inode *);
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void (*put_inode) (struct inode *);
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void (*put_super) (struct super_block *);
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void (*write_super) (struct super_block *);
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void (*statfs) (struct super_block *, struct statfs *);
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int (*remount_fs) (struct super_block *, int *, char *);
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};
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struct file_system_type {
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struct super_block *(*read_super) (struct super_block *, void *, int);
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char *name;
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int requires_dev;
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};
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#ifdef __KERNEL__
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asmlinkage int sys_open(const char *, int, int);
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asmlinkage int sys_close(unsigned int); /* yes, it's really unsigned */
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extern int getname(const char * filename, char **result);
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extern void putname(char * name);
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extern int register_blkdev(unsigned int, const char *, struct file_operations *);
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extern int blkdev_open(struct inode * inode, struct file * filp);
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extern struct file_operations def_blk_fops;
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extern struct inode_operations blkdev_inode_operations;
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extern int register_chrdev(unsigned int, const char *, struct file_operations *);
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extern int unregister_chrdev( unsigned int major, const char * name);
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extern int chrdev_open(struct inode * inode, struct file * filp);
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extern struct file_operations def_chr_fops;
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extern struct inode_operations chrdev_inode_operations;
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extern void init_fifo(struct inode * inode);
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extern struct file_operations connecting_fifo_fops;
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extern struct file_operations read_fifo_fops;
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extern struct file_operations write_fifo_fops;
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extern struct file_operations rdwr_fifo_fops;
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extern struct file_operations read_pipe_fops;
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extern struct file_operations write_pipe_fops;
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extern struct file_operations rdwr_pipe_fops;
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extern struct file_system_type *get_fs_type(char *name);
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extern int fs_may_mount(dev_t dev);
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extern int fs_may_umount(dev_t dev, struct inode * mount_root);
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extern int fs_may_remount_ro(dev_t dev);
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extern struct file *first_file;
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extern int nr_files;
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extern struct super_block super_blocks[NR_SUPER];
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extern int shrink_buffers(unsigned int priority);
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extern int nr_buffers;
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extern int buffermem;
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extern int nr_buffer_heads;
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extern void check_disk_change(dev_t dev);
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extern void invalidate_inodes(dev_t dev);
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extern void invalidate_buffers(dev_t dev);
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extern int floppy_change(struct buffer_head * first_block);
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extern void sync_inodes(dev_t dev);
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extern void sync_dev(dev_t dev);
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extern int fsync_dev(dev_t dev);
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extern void sync_supers(dev_t dev);
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extern int bmap(struct inode * inode,int block);
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extern int notify_change(int flags, struct inode * inode);
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extern int namei(const char * pathname, struct inode ** res_inode);
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extern int lnamei(const char * pathname, struct inode ** res_inode);
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extern int permission(struct inode * inode,int mask);
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extern int open_namei(const char * pathname, int flag, int mode,
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struct inode ** res_inode, struct inode * base);
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extern int do_mknod(const char * filename, int mode, dev_t dev);
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extern void iput(struct inode * inode);
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extern struct inode * __iget(struct super_block * sb,int nr,int crsmnt);
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extern struct inode * iget(struct super_block * sb,int nr);
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extern struct inode * get_empty_inode(void);
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extern void insert_inode_hash(struct inode *);
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extern void clear_inode(struct inode *);
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extern struct inode * get_pipe_inode(void);
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extern struct file * get_empty_filp(void);
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extern struct buffer_head * get_hash_table(dev_t dev, int block, int size);
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extern struct buffer_head * getblk(dev_t dev, int block, int size);
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extern void ll_rw_block(int rw, int nr, struct buffer_head * bh[]);
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extern void ll_rw_page(int rw, int dev, int nr, char * buffer);
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extern void ll_rw_swap_file(int rw, int dev, unsigned int *b, int nb, char *buffer);
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extern void brelse(struct buffer_head * buf);
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extern void set_blocksize(dev_t dev, int size);
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extern struct buffer_head * bread(dev_t dev, int block, int size);
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extern unsigned long bread_page(unsigned long addr,dev_t dev,int b[],int size,int prot);
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extern struct buffer_head * breada(dev_t dev,int block,...);
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extern void put_super(dev_t dev);
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extern dev_t ROOT_DEV;
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extern void mount_root(void);
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extern int char_read(struct inode *, struct file *, char *, int);
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extern int block_read(struct inode *, struct file *, char *, int);
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extern int read_ahead[];
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extern int char_write(struct inode *, struct file *, char *, int);
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extern int block_write(struct inode *, struct file *, char *, int);
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extern int generic_mmap(struct inode *, struct file *, unsigned long, size_t, int, unsigned long);
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extern int block_fsync(struct inode *, struct file *);
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extern int file_fsync(struct inode *, struct file *);
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#endif /* __KERNEL__ */
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#endif
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