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1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 | #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 <linux/cache.h>
#include <linux/stddef.h>
#include <linux/string.h>
#include <asm/atomic.h>
#include <asm/bitops.h>
struct poll_table_struct;
/*
* It's silly to have NR_OPEN bigger than NR_FILE, but you can change
* the file limit at runtime and only root can increase the per-process
* nr_file rlimit, so it's safe to set up a ridiculously high absolute
* upper limit on files-per-process.
*
* 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*1024) /* Absolute upper limit on fd num */
#define INR_OPEN 1024 /* Initial setting for nfile rlimits */
#define BLOCK_SIZE_BITS 10
#define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
/* And dynamically-tunable limits and defaults: */
extern int max_files, nr_files, nr_free_files;
extern int max_super_blocks, nr_super_blocks;
#define NR_FILE 8192 /* 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 SPECIAL 4 /* For non-blockdevice requests in request queue */
#define WRITERAW 5 /* raw write - don't play with buffer lists */
#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_SINGLE 8 /*
* Filesystem that can have only one superblock;
* kernel-wide vfsmnt is kept in ->kern_mnt.
*/
#define FS_NOMOUNT 16 /* Never mount from userland */
/*
* 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
*/
#define S_DEAD (1<<16) /* removed, but still open directory */
/*
* 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 nosuid 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)
#define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD)
/* 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 */
#if 0
#define BLKPG _IO(0x12,105)/* See blkpg.h */
#define BLKELVGET _IOR(0x12,106,sizeof(blkelv_ioctl_arg_t))/* elevator get */
#define BLKELVSET _IOW(0x12,107,sizeof(blkelv_ioctl_arg_t))/* elevator set */
/* This was here just to show that the number is taken -
probably all these _IO(0x12,*) ioctls should be moved to blkpg.h. */
#endif
#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>
extern void update_atime (struct inode *);
#define UPDATE_ATIME(inode) update_atime (inode)
extern void buffer_init(unsigned long);
extern void inode_init(unsigned long);
extern void file_table_init(void);
extern void dcache_init(unsigned long);
/* 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_Mapped 4 /* 1 if the buffer has a disk mapping */
#define BH_New 5 /* 1 if the buffer is new and not yet written out */
#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() 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 short b_size; /* block size */
unsigned short b_list; /* List that this buffer appears */
kdev_t b_dev; /* device (B_FREE = free) */
atomic_t b_count; /* users using this block */
kdev_t b_rdev; /* Real device */
unsigned long b_state; /* buffer state bitmap (see above) */
unsigned long b_flushtime; /* Time when (dirty) buffer should be written */
struct buffer_head *b_next_free;/* lru/free list linkage */
struct buffer_head *b_prev_free;/* doubly linked list of buffers */
struct buffer_head *b_this_page;/* circular list of buffers in one page */
struct buffer_head *b_reqnext; /* request queue */
struct buffer_head **b_pprev; /* doubly linked list of hash-queue */
char * b_data; /* pointer to data block (512 byte) */
struct page *b_page; /* the page this bh is mapped to */
void (*b_end_io)(struct buffer_head *bh, int uptodate); /* I/O completion */
void *b_dev_id;
unsigned long b_rsector; /* Real buffer location on disk */
wait_queue_head_t b_wait;
struct kiobuf * b_kiobuf; /* kiobuf which owns this IO */
};
typedef void (bh_end_io_t)(struct buffer_head *bh, int uptodate);
void init_buffer(struct buffer_head *, bh_end_io_t *, void *);
#define __buffer_state(bh, state) (((bh)->b_state & (1UL << BH_##state)) != 0)
#define buffer_uptodate(bh) __buffer_state(bh,Uptodate)
#define buffer_dirty(bh) __buffer_state(bh,Dirty)
#define buffer_locked(bh) __buffer_state(bh,Lock)
#define buffer_req(bh) __buffer_state(bh,Req)
#define buffer_mapped(bh) __buffer_state(bh,Mapped)
#define buffer_new(bh) __buffer_state(bh,New)
#define buffer_protected(bh) __buffer_state(bh,Protected)
#define bh_offset(bh) ((unsigned long)(bh)->b_data & ~PAGE_MASK)
extern void set_bh_page(struct buffer_head *bh, struct page *page, unsigned long offset);
#define touch_buffer(bh) SetPageReferenced(bh->b_page)
#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/efs_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>
#include <linux/bfs_fs_i.h>
#include <linux/udf_fs_i.h>
#include <linux/ncp_fs_i.h>
#include <linux/proc_fs_i.h>
#include <linux/usbdev_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;
loff_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>
/*
* oh the beauties of C type declarations.
*/
struct page;
struct address_space;
struct address_space_operations {
int (*writepage)(struct file *, struct page *);
int (*readpage)(struct file *, struct page *);
int (*sync_page)(struct page *);
int (*prepare_write)(struct file *, struct page *, unsigned, unsigned);
int (*commit_write)(struct file *, struct page *, unsigned, unsigned);
/* Unfortunately this kludge is needed for FIBMAP. Don't use it */
int (*bmap)(struct address_space *, long);
};
struct address_space {
struct list_head pages; /* list of pages */
unsigned long nrpages; /* number of pages */
struct address_space_operations *a_ops; /* methods */
void *host; /* owner: inode, block_device */
struct vm_area_struct *i_mmap; /* list of mappings */
spinlock_t i_shared_lock; /* and spinlock protecting it */
};
struct block_device {
struct list_head bd_hash;
atomic_t bd_count;
/* struct address_space bd_data; */
dev_t bd_dev; /* not a kdev_t - it's a search key */
atomic_t bd_openers;
const struct block_device_operations *bd_op;
struct semaphore bd_sem; /* open/close mutex */
};
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;
loff_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;
struct semaphore i_sem;
struct semaphore i_zombie;
struct inode_operations *i_op;
struct file_operations *i_fop; /* former ->i_op->default_file_ops */
struct super_block *i_sb;
wait_queue_head_t i_wait;
struct file_lock *i_flock;
struct address_space *i_mapping;
struct address_space i_data;
struct dquot *i_dquot[MAXQUOTAS];
struct pipe_inode_info *i_pipe;
struct block_device *i_bdev;
unsigned long i_state;
unsigned int i_flags;
unsigned char i_sock;
atomic_t i_writecount;
unsigned int i_attr_flags;
__u32 i_generation;
union {
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 efs_inode_info efs_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 bfs_inode_info bfs_i;
struct udf_inode_info udf_i;
struct ncp_inode_info ncpfs_i;
struct proc_inode_info proc_i;
struct socket socket_i;
struct usbdev_inode_info usbdev_i;
void *generic_ip;
} u;
};
/* Inode state bits.. */
#define I_DIRTY 1
#define I_LOCK 2
#define I_FREEING 4
#define I_CLEAR 8
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 list_head f_list;
struct dentry *f_dentry;
struct vfsmount *f_vfsmnt;
struct file_operations *f_op;
atomic_t f_count;
unsigned int f_flags;
mode_t f_mode;
loff_t f_pos;
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 spinlock_t files_lock;
#define file_list_lock() spin_lock(&files_lock);
#define file_list_unlock() spin_unlock(&files_lock);
#define get_file(x) atomic_inc(&(x)->f_count)
#define file_count(x) atomic_read(&(x)->f_count)
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;
wait_queue_head_t fl_wait;
struct file *fl_file;
unsigned char fl_flags;
unsigned char fl_type;
loff_t fl_start;
loff_t fl_end;
void (*fl_notify)(struct file_lock *); /* unblock callback */
void (*fl_insert)(struct file_lock *); /* lock insertion callback */
void (*fl_remove)(struct file_lock *); /* lock removal callback */
union {
struct nfs_lock_info nfs_fl;
} fl_u;
};
/* The following constant reflects the upper bound of the file/locking space */
#ifndef OFFSET_MAX
#define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1)))
#define OFFSET_MAX INT_LIMIT(loff_t)
#endif
extern struct file_lock *file_lock_table;
#include <linux/fcntl.h>
extern int fcntl_getlk(unsigned int, struct flock *);
extern int fcntl_setlk(unsigned int, unsigned int, struct flock *);
/* fs/locks.c */
extern void locks_remove_posix(struct file *, fl_owner_t);
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 *);
struct fasync_struct {
int magic;
int fa_fd;
struct fasync_struct *fa_next; /* singly linked list */
struct file *fa_file;
};
struct nameidata {
struct dentry *dentry;
struct vfsmount *mnt;
struct qstr last;
unsigned int flags;
int last_type;
};
#define FASYNC_MAGIC 0x4601
extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
#define DQUOT_USR_ENABLED 0x01 /* User diskquotas enabled */
#define DQUOT_GRP_ENABLED 0x02 /* Group diskquotas enabled */
struct quota_mount_options
{
unsigned int flags; /* Flags for diskquotas on this device */
struct semaphore dqio_sem; /* lock device while I/O in progress */
struct semaphore dqoff_sem; /* serialize quota_off() and quota_on() on device */
struct file *files[MAXQUOTAS]; /* fp's to quotafiles */
time_t inode_expire[MAXQUOTAS]; /* expiretime for inode-quota */
time_t block_expire[MAXQUOTAS]; /* expiretime for block-quota */
char rsquash[MAXQUOTAS]; /* for quotas threat root as any other user */
};
/*
* Umount options
*/
#define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
#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/efs_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>
#include <linux/bfs_fs_sb.h>
#include <linux/udf_fs_sb.h>
#include <linux/ncp_fs_sb.h>
#include <linux/usbdev_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_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;
struct dentry *s_root;
wait_queue_head_t s_wait;
struct list_head s_dirty; /* dirty inodes */
struct list_head s_files;
struct block_device *s_bdev;
struct list_head s_mounts; /* vfsmount(s) of this one */
struct quota_mount_options s_dquot; /* Diskquota specific options */
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 efs_sb_info efs_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;
struct bfs_sb_info bfs_sb;
struct udf_sb_info udf_sb;
struct ncp_sb_info ncpfs_sb;
struct usbdev_sb_info usbdevfs_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 */
/* The next field is used by knfsd when converting a (inode number based)
* file handle into a dentry. As it builds a path in the dcache tree from
* the bottom up, there may for a time be a subpath of dentrys which is not
* connected to the main tree. This semaphore ensure that there is only ever
* one such free path per filesystem. Note that unconnected files (or other
* non-directories) are allowed, but not unconnected diretories.
*/
struct semaphore s_nfsd_free_path_sem;
};
/*
* VFS helper functions..
*/
extern int vfs_create(struct inode *, struct dentry *, int);
extern int vfs_mkdir(struct inode *, struct dentry *, int);
extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t);
extern int vfs_symlink(struct inode *, struct dentry *, const char *);
extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
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 block_device_operations {
int (*open) (struct inode *, struct file *);
int (*release) (struct inode *, struct file *);
int (*ioctl) (struct inode *, struct file *, unsigned, unsigned long);
int (*check_media_change) (kdev_t);
int (*revalidate) (kdev_t);
};
/*
* NOTE:
* read, write, poll, fsync, readv, writev can be called
* without the big kernel lock held in all filesystems.
*/
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 (*lock) (struct file *, int, struct file_lock *);
ssize_t (*readv) (struct file *, const struct iovec *, unsigned long, loff_t *);
ssize_t (*writev) (struct file *, const struct iovec *, unsigned long, loff_t *);
};
struct inode_operations {
int (*create) (struct inode *,struct dentry *,int);
struct dentry * (*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);
int (*follow_link) (struct dentry *, struct nameidata *);
void (*truncate) (struct inode *);
int (*permission) (struct inode *, int);
int (*revalidate) (struct dentry *);
int (*setattr) (struct dentry *, struct iattr *);
int (*getattr) (struct dentry *, struct iattr *);
};
/*
* NOTE: write_inode, delete_inode, clear_inode, put_inode can be called
* without the big kernel lock held in all filesystems.
*/
struct super_operations {
void (*read_inode) (struct inode *);
void (*write_inode) (struct inode *);
void (*put_inode) (struct inode *);
void (*delete_inode) (struct inode *);
void (*put_super) (struct super_block *);
void (*write_super) (struct super_block *);
int (*statfs) (struct super_block *, struct statfs *);
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, char);
int (*alloc_inode) (const struct inode *, unsigned long);
void (*free_block) (const struct inode *, unsigned long);
void (*free_inode) (const struct inode *, unsigned long);
int (*transfer) (struct dentry *, struct iattr *);
};
struct file_system_type {
const char *name;
int fs_flags;
struct super_block *(*read_super) (struct super_block *, void *, int);
struct module *owner;
struct vfsmount *kern_mnt; /* For kernel mount, if it's FS_SINGLE fs */
struct file_system_type * next;
};
#define DECLARE_FSTYPE(var,type,read,flags) \
struct file_system_type var = { \
name: type, \
read_super: read, \
fs_flags: flags, \
owner: THIS_MODULE, \
}
#define DECLARE_FSTYPE_DEV(var,type,read) \
DECLARE_FSTYPE(var,type,read,FS_REQUIRES_DEV)
extern int register_filesystem(struct file_system_type *);
extern int unregister_filesystem(struct file_system_type *);
extern struct vfsmount *kern_mount(struct file_system_type *);
extern void kern_umount(struct vfsmount *);
extern int may_umount(struct vfsmount *);
extern long do_mount(char *, char *, char *, unsigned long, void *);
extern int vfs_statfs(struct super_block *, struct statfs *);
/* Return value for VFS lock functions - tells locks.c to lock conventionally
* REALLY kosha for root NFS and nfs_lock
*/
#define LOCK_USE_CLNT 1
#define FLOCK_VERIFY_READ 1
#define FLOCK_VERIFY_WRITE 2
extern int locks_mandatory_locked(struct inode *);
extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t);
/*
* Candidates for mandatory locking have the setgid bit set
* but no group execute bit - an otherwise meaningless combination.
*/
#define MANDATORY_LOCK(inode) \
(IS_MANDLOCK(inode) && ((inode)->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
static inline int locks_verify_locked(struct inode *inode)
{
if (MANDATORY_LOCK(inode))
return locks_mandatory_locked(inode);
return 0;
}
static inline int locks_verify_area(int read_write, struct inode *inode,
struct file *filp, loff_t offset,
size_t count)
{
if (inode->i_flock && MANDATORY_LOCK(inode))
return locks_mandatory_area(read_write, inode, filp, offset, count);
return 0;
}
static inline int locks_verify_truncate(struct inode *inode,
struct file *filp,
loff_t size)
{
if (inode->i_flock && MANDATORY_LOCK(inode))
return locks_mandatory_area(
FLOCK_VERIFY_WRITE, inode, filp,
size < inode->i_size ? size : inode->i_size,
abs(inode->i_size - size)
);
return 0;
}
/* fs/open.c */
asmlinkage long sys_open(const char *, int, int);
asmlinkage long sys_close(unsigned int); /* yes, it's really unsigned */
extern int do_close(unsigned int, int); /* yes, it's really unsigned */
extern int do_truncate(struct dentry *, loff_t start);
extern int get_unused_fd(void);
extern void __put_unused_fd(struct files_struct *, unsigned int); /* locked outside */
extern void put_unused_fd(unsigned int); /* locked inside */
extern struct file *filp_open(const char *, int, int);
extern struct file * dentry_open(struct dentry *, struct vfsmount *, int);
extern int filp_close(struct file *, fl_owner_t id);
extern char * getname(const char *);
#define __getname() ((char *) __get_free_page(GFP_KERNEL))
#define putname(name) free_page((unsigned long)(name))
enum {BDEV_FILE, BDEV_SWAP, BDEV_FS, BDEV_RAW};
extern void kill_fasync(struct fasync_struct *, int, int);
extern int register_blkdev(unsigned int, const char *, struct block_device_operations *);
extern int unregister_blkdev(unsigned int, const char *);
extern struct block_device *bdget(dev_t);
extern void bdput(struct block_device *);
extern int blkdev_open(struct inode *, struct file *);
extern int blkdev_close(struct inode * inode, struct file * filp);
extern struct file_operations def_blk_fops;
extern struct file_operations def_fifo_fops;
extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
extern int blkdev_get(struct block_device *, mode_t, unsigned, int);
extern int blkdev_put(struct block_device *, int);
/* fs/devices.c */
extern const struct block_device_operations *get_blkfops(unsigned int);
extern struct file_operations *get_chrfops(unsigned int, unsigned int);
extern int register_chrdev(unsigned int, const char *, struct file_operations *);
extern int unregister_chrdev(unsigned int, const char *);
extern int chrdev_open(struct inode *, struct file *);
extern const char * bdevname(kdev_t);
extern const char * cdevname(kdev_t);
extern const char * kdevname(kdev_t);
extern void init_special_inode(struct inode *, umode_t, int);
/* Invalid inode operations -- fs/bad_inode.c */
extern void make_bad_inode(struct inode *);
extern int is_bad_inode(struct inode *);
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 int fs_may_remount_ro(struct super_block *);
extern int try_to_free_buffers(struct page *, int);
extern void refile_buffer(struct buffer_head * buf);
#define BUF_CLEAN 0
#define BUF_LOCKED 1 /* Buffers scheduled for write */
#define BUF_DIRTY 2 /* Dirty buffers, not yet scheduled for write */
#define BUF_PROTECTED 3 /* Ramdisk persistent storage */
#define NR_LIST 4
/*
* This is called by bh->b_end_io() handlers when I/O has completed.
*/
static inline void mark_buffer_uptodate(struct buffer_head * bh, int on)
{
if (on)
set_bit(BH_Uptodate, &bh->b_state);
else
clear_bit(BH_Uptodate, &bh->b_state);
}
#define atomic_set_buffer_clean(bh) test_and_clear_bit(BH_Dirty, &(bh)->b_state)
static inline void __mark_buffer_clean(struct buffer_head *bh)
{
refile_buffer(bh);
}
static inline void mark_buffer_clean(struct buffer_head * bh)
{
if (atomic_set_buffer_clean(bh))
__mark_buffer_clean(bh);
}
#define atomic_set_buffer_protected(bh) test_and_set_bit(BH_Protected, &(bh)->b_state)
static inline void __mark_buffer_protected(struct buffer_head *bh)
{
refile_buffer(bh);
}
static inline void mark_buffer_protected(struct buffer_head * bh)
{
if (!atomic_set_buffer_protected(bh))
__mark_buffer_protected(bh);
}
extern void FASTCALL(__mark_buffer_dirty(struct buffer_head *bh, int flag));
extern void FASTCALL(mark_buffer_dirty(struct buffer_head *bh, int flag));
#define atomic_set_buffer_dirty(bh) test_and_set_bit(BH_Dirty, &(bh)->b_state)
extern void balance_dirty(kdev_t);
extern int check_disk_change(kdev_t);
extern int invalidate_inodes(struct super_block *);
extern void invalidate_inode_pages(struct inode *);
#define invalidate_buffers(dev) __invalidate_buffers((dev), 0)
#define destroy_buffers(dev) __invalidate_buffers((dev), 1)
extern void __invalidate_buffers(kdev_t dev, int);
extern void sync_inodes(kdev_t);
extern void write_inode_now(struct inode *);
extern void sync_dev(kdev_t);
extern int fsync_dev(kdev_t);
extern void sync_supers(kdev_t);
extern int bmap(struct inode *, int);
extern int notify_change(struct dentry *, struct iattr *);
extern int permission(struct inode *, int);
extern int get_write_access(struct inode *);
extern void put_write_access(struct inode *);
extern int do_pipe(int *);
extern int open_namei(const char *, int, int, struct nameidata *);
extern int kernel_read(struct file *, unsigned long, char *, unsigned long);
extern struct file * open_exec(const char *);
/* 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))
/*
* The bitmask for a lookup event:
* - follow links at the end
* - require a directory
* - ending slashes ok even for nonexistent files
* - internal "there are more path compnents" flag
*/
#define LOOKUP_FOLLOW (1)
#define LOOKUP_DIRECTORY (2)
#define LOOKUP_CONTINUE (4)
#define LOOKUP_POSITIVE (8)
#define LOOKUP_PARENT (16)
#define LOOKUP_NOALT (32)
/*
* Type of the last component on LOOKUP_PARENT
*/
enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT };
/*
* "descriptor" for what we're up to with a read for sendfile().
* This allows us to use the same read code yet
* have multiple different users of the data that
* we read from a file.
*
* The simplest case just copies the data to user
* mode.
*/
typedef struct {
size_t written;
size_t count;
char * buf;
int error;
} read_descriptor_t;
typedef int (*read_actor_t)(read_descriptor_t *, struct page *, unsigned long, unsigned long);
/* needed for stackable file system support */
extern loff_t default_llseek(struct file *file, loff_t offset, int origin);
extern int __user_walk(const char *, unsigned, struct nameidata *);
extern int path_init(const char *, unsigned, struct nameidata *);
extern int path_walk(const char *, struct nameidata *);
extern void path_release(struct nameidata *);
extern int follow_down(struct vfsmount **, struct dentry **);
extern int follow_up(struct vfsmount **, struct dentry **);
extern struct dentry * lookup_one(const char *, struct dentry *);
extern struct dentry * lookup_hash(struct qstr *, struct dentry *);
#define user_path_walk(name,nd) __user_walk(name, LOOKUP_FOLLOW|LOOKUP_POSITIVE, nd)
#define user_path_walk_link(name,nd) __user_walk(name, LOOKUP_POSITIVE, nd)
extern void iput(struct inode *);
extern struct inode * igrab(struct inode *);
extern ino_t iunique(struct super_block *, ino_t);
typedef int (*find_inode_t)(struct inode *, unsigned long, void *);
extern struct inode * iget4(struct super_block *, unsigned long, find_inode_t, void *);
static inline struct inode *iget(struct super_block *sb, unsigned long ino)
{
return iget4(sb, ino, NULL, NULL);
}
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 void file_move(struct file *f, struct list_head *list);
extern void file_moveto(struct file *new, struct file *old);
extern struct buffer_head * get_hash_table(kdev_t, int, int);
extern struct buffer_head * getblk(kdev_t, int, int);
extern void ll_rw_block(int, int, struct buffer_head * bh[]);
extern int is_read_only(kdev_t);
extern void __brelse(struct buffer_head *);
static inline void brelse(struct buffer_head *buf)
{
if (buf)
__brelse(buf);
}
extern void __bforget(struct buffer_head *);
static inline void bforget(struct buffer_head *buf)
{
if (buf)
__bforget(buf);
}
extern void set_blocksize(kdev_t, int);
extern unsigned int get_hardblocksize(kdev_t);
extern struct buffer_head * bread(kdev_t, int, int);
extern struct buffer_head * breada(kdev_t, int, int, unsigned int, unsigned int);
extern void wakeup_bdflush(int wait);
extern int brw_page(int, struct page *, kdev_t, int [], int);
typedef int (get_block_t)(struct inode*,long,struct buffer_head*,int);
/* Generic buffer handling for block filesystems.. */
extern int block_flushpage(struct page *, unsigned long);
extern int block_fsync(struct file *filp, struct dentry *dentry);
extern int block_symlink(struct inode *, const char *, int);
extern int block_write_full_page(struct page*, get_block_t*);
extern int block_read_full_page(struct page*, get_block_t*);
extern int block_prepare_write(struct page*, unsigned, unsigned, get_block_t*);
extern int cont_prepare_write(struct page*, unsigned, unsigned, get_block_t*,
unsigned long *);
extern int block_sync_page(struct page *);
int generic_block_bmap(struct address_space *, long, get_block_t *);
int generic_commit_write(struct file *, struct page *, unsigned, unsigned);
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 void do_generic_file_read(struct file *, loff_t *, read_descriptor_t *, read_actor_t);
extern ssize_t generic_read_dir(struct file *, char *, size_t, loff_t *);
extern struct file_operations generic_ro_fops;
extern int vfs_readlink(struct dentry *, char *, int, const char *);
extern int vfs_follow_link(struct nameidata *, const char *);
extern int page_readlink(struct dentry *, char *, int);
extern int page_follow_link(struct dentry *, struct nameidata *);
extern struct inode_operations page_symlink_inode_operations;
extern int vfs_readdir(struct file *, filldir_t, void *);
extern int dcache_readdir(struct file *, void *, filldir_t);
extern struct super_block *get_super(kdev_t);
struct super_block *get_empty_super(void);
extern void put_super(kdev_t);
unsigned long generate_cluster(kdev_t, int b[], int);
unsigned long generate_cluster_swab32(kdev_t, int b[], int);
extern kdev_t ROOT_DEV;
extern char root_device_name[];
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, const char *);
#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 file_fsync(struct file *, struct dentry *);
extern int generic_buffer_fdatasync(struct inode *inode, unsigned long start_idx, unsigned long end_idx);
extern int inode_change_ok(struct inode *, struct iattr *);
extern void inode_setattr(struct inode *, struct iattr *);
/*
* Common dentry functions for inclusion in the VFS
* or in other stackable file systems. Some of these
* functions were in linux/fs/ C (VFS) files.
*
*/
/*
* We need to do a check-parent every time
* after we have locked the parent - to verify
* that the parent is still our parent and
* that we are still hashed onto it..
*
* This is required in case two processes race
* on removing (or moving) the same entry: the
* parent lock will serialize them, but the
* other process will be too late..
*/
#define check_parent(dir, dentry) \
((dir) == (dentry)->d_parent && !d_unhashed(dentry))
/*
* Locking the parent is needed to:
* - serialize directory operations
* - make sure the parent doesn't change from
* under us in the middle of an operation.
*
* NOTE! Right now we'd rather use a "struct inode"
* for this, but as I expect things to move toward
* using dentries instead for most things it is
* probably better to start with the conceptually
* better interface of relying on a path of dentries.
*/
static inline struct dentry *lock_parent(struct dentry *dentry)
{
struct dentry *dir = dget(dentry->d_parent);
down(&dir->d_inode->i_sem);
return dir;
}
static inline struct dentry *get_parent(struct dentry *dentry)
{
return dget(dentry->d_parent);
}
static inline void unlock_dir(struct dentry *dir)
{
up(&dir->d_inode->i_sem);
dput(dir);
}
/*
* Whee.. Deadlock country. Happily there are only two VFS
* operations that does this..
*/
static inline void double_down(struct semaphore *s1, struct semaphore *s2)
{
if (s1 != s2) {
if ((unsigned long) s1 < (unsigned long) s2) {
struct semaphore *tmp = s2;
s2 = s1; s1 = tmp;
}
down(s1);
}
down(s2);
}
/*
* Ewwwwwwww... _triple_ lock. We are guaranteed that the 3rd argument is
* not equal to 1st and not equal to 2nd - the first case (target is parent of
* source) would be already caught, the second is plain impossible (target is
* its own parent and that case would be caught even earlier). Very messy.
* I _think_ that it works, but no warranties - please, look it through.
* Pox on bloody lusers who mandated overwriting rename() for directories...
*/
static inline void triple_down(struct semaphore *s1,
struct semaphore *s2,
struct semaphore *s3)
{
if (s1 != s2) {
if ((unsigned long) s1 < (unsigned long) s2) {
if ((unsigned long) s1 < (unsigned long) s3) {
struct semaphore *tmp = s3;
s3 = s1; s1 = tmp;
}
if ((unsigned long) s1 < (unsigned long) s2) {
struct semaphore *tmp = s2;
s2 = s1; s1 = tmp;
}
} else {
if ((unsigned long) s1 < (unsigned long) s3) {
struct semaphore *tmp = s3;
s3 = s1; s1 = tmp;
}
if ((unsigned long) s2 < (unsigned long) s3) {
struct semaphore *tmp = s3;
s3 = s2; s2 = tmp;
}
}
down(s1);
} else if ((unsigned long) s2 < (unsigned long) s3) {
struct semaphore *tmp = s3;
s3 = s2; s2 = tmp;
}
down(s2);
down(s3);
}
static inline void double_up(struct semaphore *s1, struct semaphore *s2)
{
up(s1);
if (s1 != s2)
up(s2);
}
static inline void triple_up(struct semaphore *s1,
struct semaphore *s2,
struct semaphore *s3)
{
up(s1);
if (s1 != s2)
up(s2);
up(s3);
}
static inline void double_lock(struct dentry *d1, struct dentry *d2)
{
double_down(&d1->d_inode->i_sem, &d2->d_inode->i_sem);
}
static inline void double_unlock(struct dentry *d1, struct dentry *d2)
{
double_up(&d1->d_inode->i_sem,&d2->d_inode->i_sem);
dput(d1);
dput(d2);
}
#endif /* __KERNEL__ */
#endif /* _LINUX_FS_H */
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