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- #ifndef _LINUX_FS_H
- #define _LINUX_FS_H
-
- /*
- * This file has definitions for some important file table
- * structures etc.
- */
-
- #include <linux/config.h>
- #include <linux/linkage.h>
- #include <linux/limits.h>
- #include <linux/wait.h>
- #include <linux/types.h>
- #include <linux/vfs.h>
- #include <linux/net.h>
- #include <linux/kdev_t.h>
- #include <linux/ioctl.h>
- #include <linux/list.h>
- #include <linux/dcache.h>
- #include <linux/stat.h>
-
- #include <asm/atomic.h>
- #include <asm/bitops.h>
- #include <asm/cache.h>
-
- struct poll_table_struct;
-
-
- /*
- * It's silly to have NR_OPEN bigger than NR_FILE, but I'll fix
- * that later. Anyway, now the file code is no longer dependent
- * on bitmaps in unsigned longs, but uses the new fd_set structure..
- *
- * Some programs (notably those using select()) may have to be
- * recompiled to take full advantage of the new limits..
- */
-
- /* Fixed constants first: */
- #undef NR_OPEN
- #define NR_OPEN 1024
-
- #define BLOCK_SIZE_BITS 10
- #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
-
- /* And dynamically-tunable limits and defaults: */
- extern int max_inodes;
- extern int max_files, nr_files, nr_free_files;
- extern int max_super_blocks, nr_super_blocks;
-
- #define NR_FILE 4096 /* this can well be larger on a larger system */
- #define NR_RESERVED_FILES 10 /* reserved for root */
- #define NR_SUPER 256
-
- #define MAY_EXEC 1
- #define MAY_WRITE 2
- #define MAY_READ 4
-
- #define FMODE_READ 1
- #define FMODE_WRITE 2
-
- #define READ 0
- #define WRITE 1
- #define READA 2 /* read-ahead - don't block if no resources */
- #define WRITEA 3 /* write-ahead - don't block if no resources */
-
- #ifndef NULL
- #define NULL ((void *) 0)
- #endif
-
- #define NIL_FILP ((struct file *)0)
- #define SEL_IN 1
- #define SEL_OUT 2
- #define SEL_EX 4
-
- /* public flags for file_system_type */
- #define FS_REQUIRES_DEV 1
- #define FS_NO_DCACHE 2 /* Only dcache the necessary things. */
- #define FS_NO_PRELIM 4 /* prevent preloading of dentries, even if
- * FS_NO_DCACHE is not set.
- */
- #define FS_IBASKET 8 /* FS does callback to free_ibasket() if space gets low. */
-
- /*
- * These are the fs-independent mount-flags: up to 16 flags are supported
- */
- #define MS_RDONLY 1 /* Mount read-only */
- #define MS_NOSUID 2 /* Ignore suid and sgid bits */
- #define MS_NODEV 4 /* Disallow access to device special files */
- #define MS_NOEXEC 8 /* Disallow program execution */
- #define MS_SYNCHRONOUS 16 /* Writes are synced at once */
- #define MS_REMOUNT 32 /* Alter flags of a mounted FS */
- #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
- #define S_QUOTA 128 /* Quota initialized for file/directory/symlink */
- #define S_APPEND 256 /* Append-only file */
- #define S_IMMUTABLE 512 /* Immutable file */
- #define MS_NOATIME 1024 /* Do not update access times. */
- #define MS_NODIRATIME 2048 /* Do not update directory access times */
-
- #define MS_ODD_RENAME 32768 /* Temporary stuff; will go away as soon
- * as nfs_rename() will be cleaned up
- */
-
- /*
- * Flags that can be altered by MS_REMOUNT
- */
- #define MS_RMT_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS|MS_MANDLOCK|MS_NOATIME|MS_NODIRATIME)
-
- /*
- * Magic mount flag number. Has to be or-ed to the flag values.
- */
- #define MS_MGC_VAL 0xC0ED0000 /* magic flag number to indicate "new" flags */
- #define MS_MGC_MSK 0xffff0000 /* magic flag number mask */
-
- /*
- * Note that read-only etc flags are inode-specific: setting some file-system
- * flags just means all the inodes inherit those flags by default. It might be
- * possible to override it selectively if you really wanted to with some
- * ioctl() that is not currently implemented.
- *
- * Exception: MS_RDONLY is always applied to the entire file system.
- *
- * Unfortunately, it is possible to change a filesystems flags with it mounted
- * with files in use. This means that all of the inodes will not have their
- * i_flags updated. Hence, i_flags no longer inherit the superblock mount
- * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org
- */
- #define __IS_FLG(inode,flg) (((inode)->i_sb && (inode)->i_sb->s_flags & (flg)) \
- || (inode)->i_flags & (flg))
-
- #define IS_RDONLY(inode) (((inode)->i_sb) && ((inode)->i_sb->s_flags & MS_RDONLY))
- #define IS_NOSUID(inode) __IS_FLG(inode, MS_NOSUID)
- #define IS_NODEV(inode) __IS_FLG(inode, MS_NODEV)
- #define IS_NOEXEC(inode) __IS_FLG(inode, MS_NOEXEC)
- #define IS_SYNC(inode) __IS_FLG(inode, MS_SYNCHRONOUS)
- #define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK)
-
- #define IS_QUOTAINIT(inode) ((inode)->i_flags & S_QUOTA)
- #define IS_APPEND(inode) ((inode)->i_flags & S_APPEND)
- #define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE)
- #define IS_NOATIME(inode) __IS_FLG(inode, MS_NOATIME)
- #define IS_NODIRATIME(inode) __IS_FLG(inode, MS_NODIRATIME)
-
- /* the read-only stuff doesn't really belong here, but any other place is
- probably as bad and I don't want to create yet another include file. */
-
- #define BLKROSET _IO(0x12,93) /* set device read-only (0 = read-write) */
- #define BLKROGET _IO(0x12,94) /* get read-only status (0 = read_write) */
- #define BLKRRPART _IO(0x12,95) /* re-read partition table */
- #define BLKGETSIZE _IO(0x12,96) /* return device size */
- #define BLKFLSBUF _IO(0x12,97) /* flush buffer cache */
- #define BLKRASET _IO(0x12,98) /* Set read ahead for block device */
- #define BLKRAGET _IO(0x12,99) /* get current read ahead setting */
- #define BLKFRASET _IO(0x12,100)/* set filesystem (mm/filemap.c) read-ahead */
- #define BLKFRAGET _IO(0x12,101)/* get filesystem (mm/filemap.c) read-ahead */
- #define BLKSECTSET _IO(0x12,102)/* set max sectors per request (ll_rw_blk.c) */
- #define BLKSECTGET _IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
- #define BLKSSZGET _IO(0x12,104)/* get block device sector size (reserved for) */
-
- #define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
- #define FIBMAP _IO(0x00,1) /* bmap access */
- #define FIGETBSZ _IO(0x00,2) /* get the block size used for bmap */
-
- #ifdef __KERNEL__
-
- #include <asm/semaphore.h>
- #include <asm/byteorder.h>
- #include <asm/bitops.h>
-
- extern void update_atime (struct inode *inode);
- #define UPDATE_ATIME(inode) update_atime (inode)
-
- extern void buffer_init(void);
- extern void inode_init(void);
- extern void file_table_init(void);
- extern void dcache_init(void);
-
- typedef char buffer_block[BLOCK_SIZE];
-
- /* bh state bits */
- #define BH_Uptodate 0 /* 1 if the buffer contains valid data */
- #define BH_Dirty 1 /* 1 if the buffer is dirty */
- #define BH_Lock 2 /* 1 if the buffer is locked */
- #define BH_Req 3 /* 0 if the buffer has been invalidated */
- #define BH_Protected 6 /* 1 if the buffer is protected */
-
- /*
- * Try to keep the most commonly used fields in single cache lines (16
- * bytes) to improve performance. This ordering should be
- * particularly beneficial on 32-bit processors.
- *
- * We use the first 16 bytes for the data which is used in searches
- * over the block hash lists (ie. getblk(), find_buffer() and
- * friends).
- *
- * The second 16 bytes we use for lru buffer scans, as used by
- * sync_buffers() and refill_freelist(). -- sct
- */
- struct buffer_head {
- /* First cache line: */
- struct buffer_head * b_next; /* Hash queue list */
- unsigned long b_blocknr; /* block number */
- unsigned long b_size; /* block size */
- kdev_t b_dev; /* device (B_FREE = free) */
- kdev_t b_rdev; /* Real device */
- unsigned long b_rsector; /* Real buffer location on disk */
- struct buffer_head * b_this_page; /* circular list of buffers in one page */
- unsigned long b_state; /* buffer state bitmap (see above) */
- struct buffer_head * b_next_free;
- unsigned int b_count; /* users using this block */
-
- /* Non-performance-critical data follows. */
- char * b_data; /* pointer to data block (1024 bytes) */
- unsigned int b_list; /* List that this buffer appears */
- unsigned long b_flushtime; /* Time when this (dirty) buffer
- * should be written */
- struct wait_queue * b_wait;
- struct buffer_head ** b_pprev; /* doubly linked list of hash-queue */
- struct buffer_head * b_prev_free; /* doubly linked list of buffers */
- struct buffer_head * b_reqnext; /* request queue */
-
- /*
- * I/O completion
- */
- void (*b_end_io)(struct buffer_head *bh, int uptodate);
- void *b_dev_id;
- };
-
- typedef void (bh_end_io_t)(struct buffer_head *bh, int uptodate);
- void init_buffer(struct buffer_head *bh, kdev_t dev, int block,
- bh_end_io_t *handler, void *dev_id);
-
- static inline int buffer_uptodate(struct buffer_head * bh)
- {
- return test_bit(BH_Uptodate, &bh->b_state);
- }
-
- static inline int buffer_dirty(struct buffer_head * bh)
- {
- return test_bit(BH_Dirty, &bh->b_state);
- }
-
- static inline int buffer_locked(struct buffer_head * bh)
- {
- return test_bit(BH_Lock, &bh->b_state);
- }
-
- static inline int buffer_req(struct buffer_head * bh)
- {
- return test_bit(BH_Req, &bh->b_state);
- }
-
- static inline int buffer_protected(struct buffer_head * bh)
- {
- return test_bit(BH_Protected, &bh->b_state);
- }
-
- /*
- * Deprecated - we don't keep per-buffer reference flags
- * any more.
- *
- * We _could_ try to update the page reference, but that
- * doesn't seem to really be worth it either. If we did,
- * it would look something like this:
- *
- * #define buffer_page(bh) (mem_map + MAP_NR((bh)->b_data))
- * #define touch_buffer(bh) set_bit(PG_referenced, &buffer_page(bh)->flags)
- */
- #define touch_buffer(bh) do { } while (0)
-
- #include <linux/pipe_fs_i.h>
- #include <linux/minix_fs_i.h>
- #include <linux/ext2_fs_i.h>
- #include <linux/hpfs_fs_i.h>
- #include <linux/ntfs_fs_i.h>
- #include <linux/msdos_fs_i.h>
- #include <linux/umsdos_fs_i.h>
- #include <linux/iso_fs_i.h>
- #include <linux/nfs_fs_i.h>
- #include <linux/sysv_fs_i.h>
- #include <linux/affs_fs_i.h>
- #include <linux/ufs_fs_i.h>
- #include <linux/coda_fs_i.h>
- #include <linux/romfs_fs_i.h>
- #include <linux/smb_fs_i.h>
- #include <linux/hfs_fs_i.h>
- #include <linux/adfs_fs_i.h>
- #include <linux/qnx4_fs_i.h>
-
- /*
- * Attribute flags. These should be or-ed together to figure out what
- * has been changed!
- */
- #define ATTR_MODE 1
- #define ATTR_UID 2
- #define ATTR_GID 4
- #define ATTR_SIZE 8
- #define ATTR_ATIME 16
- #define ATTR_MTIME 32
- #define ATTR_CTIME 64
- #define ATTR_ATIME_SET 128
- #define ATTR_MTIME_SET 256
- #define ATTR_FORCE 512 /* Not a change, but a change it */
- #define ATTR_ATTR_FLAG 1024
-
- /*
- * This is the Inode Attributes structure, used for notify_change(). It
- * uses the above definitions as flags, to know which values have changed.
- * Also, in this manner, a Filesystem can look at only the values it cares
- * about. Basically, these are the attributes that the VFS layer can
- * request to change from the FS layer.
- *
- * Derek Atkins <warlord@MIT.EDU> 94-10-20
- */
- struct iattr {
- unsigned int ia_valid;
- umode_t ia_mode;
- uid_t ia_uid;
- gid_t ia_gid;
- off_t ia_size;
- time_t ia_atime;
- time_t ia_mtime;
- time_t ia_ctime;
- unsigned int ia_attr_flags;
- };
-
- /*
- * This is the inode attributes flag definitions
- */
- #define ATTR_FLAG_SYNCRONOUS 1 /* Syncronous write */
- #define ATTR_FLAG_NOATIME 2 /* Don't update atime */
- #define ATTR_FLAG_APPEND 4 /* Append-only file */
- #define ATTR_FLAG_IMMUTABLE 8 /* Immutable file */
- #define ATTR_FLAG_NODIRATIME 16 /* Don't update atime for directory */
-
- /*
- * Includes for diskquotas and mount structures.
- */
- #include <linux/quota.h>
- #include <linux/mount.h>
-
- struct inode {
- struct list_head i_hash;
- struct list_head i_list;
- struct list_head i_dentry;
-
- unsigned long i_ino;
- unsigned int i_count;
- kdev_t i_dev;
- umode_t i_mode;
- nlink_t i_nlink;
- uid_t i_uid;
- gid_t i_gid;
- kdev_t i_rdev;
- off_t i_size;
- time_t i_atime;
- time_t i_mtime;
- time_t i_ctime;
- unsigned long i_blksize;
- unsigned long i_blocks;
- unsigned long i_version;
- unsigned long i_nrpages;
- struct semaphore i_sem;
- struct semaphore i_atomic_write;
- struct inode_operations *i_op;
- struct super_block *i_sb;
- struct wait_queue *i_wait;
- struct file_lock *i_flock;
- struct vm_area_struct *i_mmap;
- struct page *i_pages;
- struct dquot *i_dquot[MAXQUOTAS];
-
- unsigned long i_state;
-
- unsigned int i_flags;
- unsigned char i_pipe;
- unsigned char i_sock;
-
- int i_writecount;
- unsigned int i_attr_flags;
- __u32 i_generation;
- union {
- struct pipe_inode_info pipe_i;
- struct minix_inode_info minix_i;
- struct ext2_inode_info ext2_i;
- struct hpfs_inode_info hpfs_i;
- struct ntfs_inode_info ntfs_i;
- struct msdos_inode_info msdos_i;
- struct umsdos_inode_info umsdos_i;
- struct iso_inode_info isofs_i;
- struct nfs_inode_info nfs_i;
- struct sysv_inode_info sysv_i;
- struct affs_inode_info affs_i;
- struct ufs_inode_info ufs_i;
- struct romfs_inode_info romfs_i;
- struct coda_inode_info coda_i;
- struct smb_inode_info smbfs_i;
- struct hfs_inode_info hfs_i;
- struct adfs_inode_info adfs_i;
- struct qnx4_inode_info qnx4_i;
- struct socket socket_i;
- void *generic_ip;
- } u;
- };
-
- /* Inode state bits.. */
- #define I_DIRTY 1
- #define I_LOCK 2
- #define I_FREEING 4
-
- extern void __mark_inode_dirty(struct inode *);
- static inline void mark_inode_dirty(struct inode *inode)
- {
- if (!(inode->i_state & I_DIRTY))
- __mark_inode_dirty(inode);
- }
-
- struct fown_struct {
- int pid; /* pid or -pgrp where SIGIO should be sent */
- uid_t uid, euid; /* uid/euid of process setting the owner */
- int signum; /* posix.1b rt signal to be delivered on IO */
- };
-
- struct file {
- struct file *f_next, **f_pprev;
- struct dentry *f_dentry;
- struct file_operations *f_op;
- mode_t f_mode;
- loff_t f_pos;
- unsigned int f_count, f_flags;
- unsigned long f_reada, f_ramax, f_raend, f_ralen, f_rawin;
- struct fown_struct f_owner;
- unsigned int f_uid, f_gid;
- int f_error;
-
- unsigned long f_version;
-
- /* needed for tty driver, and maybe others */
- void *private_data;
- };
-
- extern int init_private_file(struct file *, struct dentry *, int);
-
- #define FL_POSIX 1
- #define FL_FLOCK 2
- #define FL_BROKEN 4 /* broken flock() emulation */
- #define FL_ACCESS 8 /* for processes suspended by mandatory locking */
- #define FL_LOCKD 16 /* lock held by rpc.lockd */
-
- /*
- * The POSIX file lock owner is determined by
- * the "struct files_struct" in the thread group
- * (or NULL for no owner - BSD locks).
- *
- * Lockd stuffs a "host" pointer into this.
- */
- typedef struct files_struct *fl_owner_t;
-
- struct file_lock {
- struct file_lock *fl_next; /* singly linked list for this inode */
- struct file_lock *fl_nextlink; /* doubly linked list of all locks */
- struct file_lock *fl_prevlink; /* used to simplify lock removal */
- struct file_lock *fl_nextblock; /* circular list of blocked processes */
- struct file_lock *fl_prevblock;
- fl_owner_t fl_owner;
- unsigned int fl_pid;
- struct wait_queue *fl_wait;
- struct file *fl_file;
- unsigned char fl_flags;
- unsigned char fl_type;
- off_t fl_start;
- off_t fl_end;
-
- void (*fl_notify)(struct file_lock *); /* unblock callback */
-
- union {
- struct nfs_lock_info nfs_fl;
- } fl_u;
- };
-
- extern struct file_lock *file_lock_table;
-
- #include <linux/fcntl.h>
-
- extern int fcntl_getlk(unsigned int fd, struct flock *l);
- extern int fcntl_setlk(unsigned int fd, unsigned int cmd, struct flock *l);
-
- /* fs/locks.c */
- extern void locks_remove_posix(struct file *, fl_owner_t id);
- extern void locks_remove_flock(struct file *);
- extern struct file_lock *posix_test_lock(struct file *, struct file_lock *);
- extern int posix_lock_file(struct file *, struct file_lock *, unsigned int);
- extern void posix_block_lock(struct file_lock *, struct file_lock *);
- extern void posix_unblock_lock(struct file_lock *);
-
- #include <linux/stat.h>
-
- struct fasync_struct {
- int magic;
- int fa_fd;
- struct fasync_struct *fa_next; /* singly linked list */
- struct file *fa_file;
- };
-
- #define FASYNC_MAGIC 0x4601
-
- extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
-
- #include <linux/minix_fs_sb.h>
- #include <linux/ext2_fs_sb.h>
- #include <linux/hpfs_fs_sb.h>
- #include <linux/ntfs_fs_sb.h>
- #include <linux/msdos_fs_sb.h>
- #include <linux/iso_fs_sb.h>
- #include <linux/nfs_fs_sb.h>
- #include <linux/sysv_fs_sb.h>
- #include <linux/affs_fs_sb.h>
- #include <linux/ufs_fs_sb.h>
- #include <linux/romfs_fs_sb.h>
- #include <linux/smb_fs_sb.h>
- #include <linux/hfs_fs_sb.h>
- #include <linux/adfs_fs_sb.h>
- #include <linux/qnx4_fs_sb.h>
-
- extern struct list_head super_blocks;
-
- #define sb_entry(list) list_entry((list), struct super_block, s_list)
- struct super_block {
- struct list_head s_list; /* Keep this first */
- kdev_t s_dev;
- unsigned long s_blocksize;
- unsigned char s_blocksize_bits;
- unsigned char s_lock;
- unsigned char s_rd_only;
- unsigned char s_dirt;
- struct file_system_type *s_type;
- struct super_operations *s_op;
- struct dquot_operations *dq_op;
- unsigned long s_flags;
- unsigned long s_magic;
- unsigned long s_time;
- struct dentry *s_root;
- struct wait_queue *s_wait;
-
- struct inode *s_ibasket;
- short int s_ibasket_count;
- short int s_ibasket_max;
- struct list_head s_dirty; /* dirty inodes */
-
- union {
- struct minix_sb_info minix_sb;
- struct ext2_sb_info ext2_sb;
- struct hpfs_sb_info hpfs_sb;
- struct ntfs_sb_info ntfs_sb;
- struct msdos_sb_info msdos_sb;
- struct isofs_sb_info isofs_sb;
- struct nfs_sb_info nfs_sb;
- struct sysv_sb_info sysv_sb;
- struct affs_sb_info affs_sb;
- struct ufs_sb_info ufs_sb;
- struct romfs_sb_info romfs_sb;
- struct smb_sb_info smbfs_sb;
- struct hfs_sb_info hfs_sb;
- struct adfs_sb_info adfs_sb;
- struct qnx4_sb_info qnx4_sb;
- void *generic_sbp;
- } u;
- /*
- * The next field is for VFS *only*. No filesystems have any business
- * even looking at it. You had been warned.
- */
- struct semaphore s_vfs_rename_sem; /* Kludge */
- };
-
- /*
- * VFS helper functions..
- */
- extern int vfs_rmdir(struct inode *, struct dentry *);
- extern int vfs_unlink(struct inode *, struct dentry *);
- extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
-
- /*
- * This is the "filldir" function type, used by readdir() to let
- * the kernel specify what kind of dirent layout it wants to have.
- * This allows the kernel to read directories into kernel space or
- * to have different dirent layouts depending on the binary type.
- */
- typedef int (*filldir_t)(void *, const char *, int, off_t, ino_t);
-
- struct file_operations {
- loff_t (*llseek) (struct file *, loff_t, int);
- ssize_t (*read) (struct file *, char *, size_t, loff_t *);
- ssize_t (*write) (struct file *, const char *, size_t, loff_t *);
- int (*readdir) (struct file *, void *, filldir_t);
- unsigned int (*poll) (struct file *, struct poll_table_struct *);
- int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
- int (*mmap) (struct file *, struct vm_area_struct *);
- int (*open) (struct inode *, struct file *);
- int (*flush) (struct file *);
- int (*release) (struct inode *, struct file *);
- int (*fsync) (struct file *, struct dentry *);
- int (*fasync) (int, struct file *, int);
- int (*check_media_change) (kdev_t dev);
- int (*revalidate) (kdev_t dev);
- int (*lock) (struct file *, int, struct file_lock *);
- };
-
- struct inode_operations {
- struct file_operations * default_file_ops;
- int (*create) (struct inode *,struct dentry *,int);
- int (*lookup) (struct inode *,struct dentry *);
- int (*link) (struct dentry *,struct inode *,struct dentry *);
- int (*unlink) (struct inode *,struct dentry *);
- int (*symlink) (struct inode *,struct dentry *,const char *);
- int (*mkdir) (struct inode *,struct dentry *,int);
- int (*rmdir) (struct inode *,struct dentry *);
- int (*mknod) (struct inode *,struct dentry *,int,int);
- int (*rename) (struct inode *, struct dentry *,
- struct inode *, struct dentry *);
- int (*readlink) (struct dentry *, char *,int);
- struct dentry * (*follow_link) (struct dentry *, struct dentry *, unsigned int);
- int (*readpage) (struct file *, struct page *);
- int (*writepage) (struct file *, struct page *);
- int (*bmap) (struct inode *,int);
- void (*truncate) (struct inode *);
- int (*permission) (struct inode *, int);
- int (*smap) (struct inode *,int);
- int (*updatepage) (struct file *, struct page *, unsigned long, unsigned int, int);
- int (*revalidate) (struct dentry *);
- };
-
- struct super_operations {
- void (*read_inode) (struct inode *);
- void (*write_inode) (struct inode *);
- void (*put_inode) (struct inode *);
- void (*delete_inode) (struct inode *);
- int (*notify_change) (struct dentry *, struct iattr *);
- void (*put_super) (struct super_block *);
- void (*write_super) (struct super_block *);
- int (*statfs) (struct super_block *, struct statfs *, int);
- int (*remount_fs) (struct super_block *, int *, char *);
- void (*clear_inode) (struct inode *);
- void (*umount_begin) (struct super_block *);
- };
-
- struct dquot_operations {
- void (*initialize) (struct inode *, short);
- void (*drop) (struct inode *);
- int (*alloc_block) (const struct inode *, unsigned long, uid_t, char);
- int (*alloc_inode) (const struct inode *, unsigned long, uid_t);
- void (*free_block) (const struct inode *, unsigned long);
- void (*free_inode) (const struct inode *, unsigned long);
- int (*transfer) (struct inode *, struct iattr *, char, uid_t);
- };
-
- struct file_system_type {
- const char *name;
- int fs_flags;
- struct super_block *(*read_super) (struct super_block *, void *, int);
- struct file_system_type * next;
- };
-
- extern int register_filesystem(struct file_system_type *);
- extern int unregister_filesystem(struct file_system_type *);
-
-
- #define FLOCK_VERIFY_READ 1
- #define FLOCK_VERIFY_WRITE 2
-
- extern int locks_mandatory_locked(struct inode *inode);
- extern int locks_mandatory_area(int read_write, struct inode *inode,
- struct file *filp, loff_t offset,
- size_t count);
-
- extern inline int locks_verify_locked(struct inode *inode)
- {
- /* Candidates for mandatory locking have the setgid bit set
- * but no group execute bit - an otherwise meaningless combination.
- */
- if (IS_MANDLOCK(inode) &&
- (inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
- return (locks_mandatory_locked(inode));
- return (0);
- }
-
- extern inline int locks_verify_area(int read_write, struct inode *inode,
- struct file *filp, loff_t offset,
- size_t count)
- {
- /* Candidates for mandatory locking have the setgid bit set
- * but no group execute bit - an otherwise meaningless combination.
- */
- if (IS_MANDLOCK(inode) &&
- (inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
- return (locks_mandatory_area(read_write, inode, filp, offset,
- count));
- return (0);
- }
-
-
- /* fs/open.c */
-
- asmlinkage int sys_open(const char *, int, int);
- asmlinkage int sys_close(unsigned int); /* yes, it's really unsigned */
- extern int do_truncate(struct dentry *, unsigned long);
- extern int get_unused_fd(void);
- extern void put_unused_fd(unsigned int);
-
- extern struct file *filp_open(const char *, int, int);
- extern int filp_close(struct file *, fl_owner_t id);
-
- extern char * getname(const char * filename);
- #define __getname() ((char *) __get_free_page(GFP_KERNEL))
- #define putname(name) free_page((unsigned long)(name))
-
- extern void kill_fasync(struct fasync_struct *fa, int sig);
- extern int register_blkdev(unsigned int, const char *, struct file_operations *);
- extern int unregister_blkdev(unsigned int major, const char * name);
- extern int blkdev_open(struct inode * inode, struct file * filp);
- extern int blkdev_release (struct inode * inode);
- extern struct file_operations def_blk_fops;
- extern struct inode_operations blkdev_inode_operations;
-
- /* fs/devices.c */
- extern int register_chrdev(unsigned int, const char *, struct file_operations *);
- extern int unregister_chrdev(unsigned int major, const char * name);
- extern int chrdev_open(struct inode * inode, struct file * filp);
- extern struct file_operations def_chr_fops;
- extern struct inode_operations chrdev_inode_operations;
- extern char * bdevname(kdev_t dev);
- extern char * cdevname(kdev_t dev);
- extern char * kdevname(kdev_t dev);
-
-
- extern void init_fifo(struct inode * inode);
- extern struct inode_operations fifo_inode_operations;
-
- /* Invalid inode operations -- fs/bad_inode.c */
- extern void make_bad_inode(struct inode * inode);
- extern int is_bad_inode(struct inode * inode);
-
- extern struct file_operations connecting_fifo_fops;
- extern struct file_operations read_fifo_fops;
- extern struct file_operations write_fifo_fops;
- extern struct file_operations rdwr_fifo_fops;
- extern struct file_operations read_pipe_fops;
- extern struct file_operations write_pipe_fops;
- extern struct file_operations rdwr_pipe_fops;
-
- extern struct file_system_type *get_fs_type(const char *name);
-
- extern int fs_may_remount_ro(struct super_block *);
- extern int fs_may_mount(kdev_t dev);
-
- extern struct file *inuse_filps;
-
- extern void refile_buffer(struct buffer_head * buf);
- extern void set_writetime(struct buffer_head * buf, int flag);
- extern int try_to_free_buffers(struct page *);
-
- extern int nr_buffers;
- extern int buffermem;
- extern int nr_buffer_heads;
-
- #define BUF_CLEAN 0
- #define BUF_LOCKED 1 /* Buffers scheduled for write */
- #define BUF_DIRTY 2 /* Dirty buffers, not yet scheduled for write */
- #define NR_LIST 3
-
- void mark_buffer_uptodate(struct buffer_head * bh, int on);
-
- extern inline void mark_buffer_clean(struct buffer_head * bh)
- {
- if (test_and_clear_bit(BH_Dirty, &bh->b_state)) {
- if (bh->b_list == BUF_DIRTY)
- refile_buffer(bh);
- }
- }
-
- extern inline void mark_buffer_dirty(struct buffer_head * bh, int flag)
- {
- if (!test_and_set_bit(BH_Dirty, &bh->b_state)) {
- set_writetime(bh, flag);
- if (bh->b_list != BUF_DIRTY)
- refile_buffer(bh);
- }
- }
-
- extern int check_disk_change(kdev_t dev);
- extern int invalidate_inodes(struct super_block * sb);
- extern void invalidate_inode_pages(struct inode *);
- extern void invalidate_buffers(kdev_t dev);
- extern int floppy_is_wp(int minor);
- extern void sync_inodes(kdev_t dev);
- extern void write_inode_now(struct inode *inode);
- extern void sync_dev(kdev_t dev);
- extern int fsync_dev(kdev_t dev);
- extern void sync_supers(kdev_t dev);
- extern int bmap(struct inode * inode,int block);
- extern int notify_change(struct dentry *, struct iattr *);
- extern int permission(struct inode * inode,int mask);
- extern int get_write_access(struct inode *inode);
- extern void put_write_access(struct inode *inode);
- extern struct dentry * open_namei(const char * pathname, int flag, int mode);
- extern struct dentry * do_mknod(const char * filename, int mode, dev_t dev);
- extern int do_pipe(int *);
-
- /* fs/dcache.c -- generic fs support functions */
- extern int is_subdir(struct dentry *, struct dentry *);
- extern ino_t find_inode_number(struct dentry *, struct qstr *);
-
- /*
- * Kernel pointers have redundant information, so we can use a
- * scheme where we can return either an error code or a dentry
- * pointer with the same return value.
- *
- * This should be a per-architecture thing, to allow different
- * error and pointer decisions.
- */
- #define ERR_PTR(err) ((void *)((long)(err)))
- #define PTR_ERR(ptr) ((long)(ptr))
- #define IS_ERR(ptr) ((unsigned long)(ptr) > (unsigned long)(-1000))
-
- extern struct dentry * lookup_dentry(const char *, struct dentry *, unsigned int);
- extern struct dentry * __namei(const char *, unsigned int);
-
- #define namei(pathname) __namei(pathname, 1)
- #define lnamei(pathname) __namei(pathname, 0)
-
- extern void iput(struct inode *);
- extern struct inode * iget(struct super_block *, unsigned long);
- extern void clear_inode(struct inode *);
- extern struct inode * get_empty_inode(void);
-
- extern void insert_inode_hash(struct inode *);
- extern void remove_inode_hash(struct inode *);
- extern struct file * get_empty_filp(void);
- extern struct buffer_head * get_hash_table(kdev_t, int, int);
- extern struct buffer_head * getblk(kdev_t, int, int);
- extern struct buffer_head * find_buffer(kdev_t dev, int block, int size);
- extern void ll_rw_block(int, int, struct buffer_head * bh[]);
- extern int is_read_only(kdev_t);
- extern void __brelse(struct buffer_head *);
- extern inline void brelse(struct buffer_head *buf)
- {
- if (buf)
- __brelse(buf);
- }
- extern void __bforget(struct buffer_head *buf);
- extern inline void bforget(struct buffer_head *buf)
- {
- if (buf)
- __bforget(buf);
- }
- extern void set_blocksize(kdev_t dev, int size);
- extern unsigned int get_hardblocksize(kdev_t dev);
- extern struct buffer_head * bread(kdev_t dev, int block, int size);
- extern struct buffer_head * breada(kdev_t dev,int block, int size,
- unsigned int pos, unsigned int filesize);
-
- extern int brw_page(int, struct page *, kdev_t, int [], int, int);
-
- extern int generic_readpage(struct file *, struct page *);
- extern int generic_file_mmap(struct file *, struct vm_area_struct *);
- extern ssize_t generic_file_read(struct file *, char *, size_t, loff_t *);
- extern ssize_t generic_file_write(struct file *, const char*, size_t, loff_t*);
-
- extern struct super_block *get_super(kdev_t dev);
- extern void put_super(kdev_t dev);
- unsigned long generate_cluster(kdev_t dev, int b[], int size);
- unsigned long generate_cluster_swab32(kdev_t dev, int b[], int size);
- extern kdev_t ROOT_DEV;
-
- extern void show_buffers(void);
- extern void mount_root(void);
-
- #ifdef CONFIG_BLK_DEV_INITRD
- extern kdev_t real_root_dev;
- extern int change_root(kdev_t new_root_dev,const char *put_old);
- #endif
-
- extern ssize_t char_read(struct file *, char *, size_t, loff_t *);
- extern ssize_t block_read(struct file *, char *, size_t, loff_t *);
- extern int read_ahead[];
-
- extern ssize_t char_write(struct file *, const char *, size_t, loff_t *);
- extern ssize_t block_write(struct file *, const char *, size_t, loff_t *);
-
- extern int block_fsync(struct file *, struct dentry *dir);
- extern int file_fsync(struct file *, struct dentry *dir);
-
- extern int inode_change_ok(struct inode *, struct iattr *);
- extern void inode_setattr(struct inode *, struct iattr *);
-
- /* kludge to get SCSI modules working */
- #include <linux/minix_fs.h>
- #include <linux/minix_fs_sb.h>
-
- #endif /* __KERNEL__ */
-
- #endif
-