Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1677 insertions, 0 deletions

diff --git a/include/linux/fs.h b/include/linux/fs.h
new file mode 100644
index 000000000000..5df687d940fa
--- /dev/null
+++ b/include/linux/fs.h
@@ -0,0 +1,1677 @@
+#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/limits.h>
+#include <linux/ioctl.h>
+
+/*
+ * 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: */
+struct files_stat_struct {
+        int nr_files;           /* read only */
+        int nr_free_files;      /* read only */
+        int max_files;          /* tunable */
+};
+extern struct files_stat_struct files_stat;
+
+struct inodes_stat_t {
+        int nr_inodes;
+        int nr_unused;
+        int dummy[5];
+};
+extern struct inodes_stat_t inodes_stat;
+
+extern int leases_enable, lease_break_time;
+
+#ifdef CONFIG_DNOTIFY
+extern int dir_notify_enable;
+#endif
+
+#define NR_FILE  8192   /* this can well be larger on a larger system */
+
+#define MAY_EXEC 1
+#define MAY_WRITE 2
+#define MAY_READ 4
+#define MAY_APPEND 8
+
+#define FMODE_READ 1
+#define FMODE_WRITE 2
+
+/* Internal kernel extensions */
+#define FMODE_LSEEK     4
+#define FMODE_PREAD     8
+#define FMODE_PWRITE    FMODE_PREAD     /* These go hand in hand */
+
+#define RW_MASK         1
+#define RWA_MASK        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 READ_SYNC       (READ | (1 << BIO_RW_SYNC))
+#define WRITE_SYNC      (WRITE | (1 << BIO_RW_SYNC))
+#define WRITE_BARRIER   ((1 << BIO_RW) | (1 << BIO_RW_BARRIER))
+
+#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_BINARY_MOUNTDATA 2
+#define FS_REVAL_DOT    16384   /* Check the paths ".", ".." for staleness */
+#define FS_ODD_RENAME   32768   /* Temporary stuff; will go away as soon
+                                  * as nfs_rename() will be cleaned up
+                                  */
+/*
+ * These are the fs-independent mount-flags: up to 32 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 MS_DIRSYNC      128     /* Directory modifications are synchronous */
+#define MS_NOATIME      1024    /* Do not update access times. */
+#define MS_NODIRATIME   2048    /* Do not update directory access times */
+#define MS_BIND         4096
+#define MS_MOVE         8192
+#define MS_REC          16384
+#define MS_VERBOSE      32768
+#define MS_POSIXACL     (1<<16) /* VFS does not apply the umask */
+#define MS_ACTIVE       (1<<30)
+#define MS_NOUSER       (1<<31)
+
+/*
+ * Superblock flags that can be altered by MS_REMOUNT
+ */
+#define MS_RMT_MASK     (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_NOATIME|\
+                         MS_NODIRATIME)
+
+/*
+ * Old magic mount flag and mask
+ */
+#define MS_MGC_VAL 0xC0ED0000
+#define MS_MGC_MSK 0xffff0000
+
+/* Inode flags - they have nothing to superblock flags now */
+
+#define S_SYNC          1       /* Writes are synced at once */
+#define S_NOATIME       2       /* Do not update access times */
+#define S_APPEND        4       /* Append-only file */
+#define S_IMMUTABLE     8       /* Immutable file */
+#define S_DEAD          16      /* removed, but still open directory */
+#define S_NOQUOTA       32      /* Inode is not counted to quota */
+#define S_DIRSYNC       64      /* Directory modifications are synchronous */
+#define S_NOCMTIME      128     /* Do not update file c/mtime */
+#define S_SWAPFILE      256     /* Do not truncate: swapon got its bmaps */
+#define S_PRIVATE       512     /* Inode is fs-internal */
+
+/*
+ * 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->s_flags & (flg))
+
+#define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY)
+#define IS_SYNC(inode)          (__IS_FLG(inode, MS_SYNCHRONOUS) || \
+                                        ((inode)->i_flags & S_SYNC))
+#define IS_DIRSYNC(inode)       (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \
+                                        ((inode)->i_flags & (S_SYNC|S_DIRSYNC)))
+#define IS_MANDLOCK(inode)      __IS_FLG(inode, MS_MANDLOCK)
+
+#define IS_NOQUOTA(inode)       ((inode)->i_flags & S_NOQUOTA)
+#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) || ((inode)->i_flags & S_NOATIME))
+#define IS_NODIRATIME(inode)    __IS_FLG(inode, MS_NODIRATIME)
+#define IS_POSIXACL(inode)      __IS_FLG(inode, MS_POSIXACL)
+
+#define IS_DEADDIR(inode)       ((inode)->i_flags & S_DEAD)
+#define IS_NOCMTIME(inode)      ((inode)->i_flags & S_NOCMTIME)
+#define IS_SWAPFILE(inode)      ((inode)->i_flags & S_SWAPFILE)
+#define IS_PRIVATE(inode)       ((inode)->i_flags & S_PRIVATE)
+
+/* 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 /512 (long *arg) */
+#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 */
+
+/* Some people are morons.  Do not use sizeof! */
+
+#define BLKELVGET  _IOR(0x12,106,size_t)/* elevator get */
+#define BLKELVSET  _IOW(0x12,107,size_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
+/* A jump here: 108-111 have been used for various private purposes. */
+#define BLKBSZGET  _IOR(0x12,112,size_t)
+#define BLKBSZSET  _IOW(0x12,113,size_t)
+#define BLKGETSIZE64 _IOR(0x12,114,size_t)      /* return device size in bytes (u64 *arg) */
+
+#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 <linux/linkage.h>
+#include <linux/wait.h>
+#include <linux/types.h>
+#include <linux/kdev_t.h>
+#include <linux/dcache.h>
+#include <linux/stat.h>
+#include <linux/cache.h>
+#include <linux/kobject.h>
+#include <linux/list.h>
+#include <linux/radix-tree.h>
+#include <linux/prio_tree.h>
+#include <linux/init.h>
+
+#include <asm/atomic.h>
+#include <asm/semaphore.h>
+#include <asm/byteorder.h>
+
+struct iovec;
+struct nameidata;
+struct pipe_inode_info;
+struct poll_table_struct;
+struct kstatfs;
+struct vm_area_struct;
+struct vfsmount;
+
+/* Used to be a macro which just called the function, now just a function */
+extern void update_atime (struct inode *);
+
+extern void __init inode_init(unsigned long);
+extern void __init inode_init_early(void);
+extern void __init mnt_init(unsigned long);
+extern void __init files_init(unsigned long);
+
+struct buffer_head;
+typedef int (get_block_t)(struct inode *inode, sector_t iblock,
+                        struct buffer_head *bh_result, int create);
+typedef int (get_blocks_t)(struct inode *inode, sector_t iblock,
+                        unsigned long max_blocks,
+                        struct buffer_head *bh_result, int create);
+typedef void (dio_iodone_t)(struct inode *inode, loff_t offset,
+                        ssize_t bytes, void *private);
+
+/*
+ * 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
+#define ATTR_KILL_SUID  2048
+#define ATTR_KILL_SGID  4096
+
+/*
+ * 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;
+        struct timespec ia_atime;
+        struct timespec ia_mtime;
+        struct timespec 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.
+ */
+#include <linux/quota.h>
+
+/*
+ * oh the beauties of C type declarations.
+ */
+struct page;
+struct address_space;
+struct writeback_control;
+struct kiocb;
+
+struct address_space_operations {
+        int (*writepage)(struct page *page, struct writeback_control *wbc);
+        int (*readpage)(struct file *, struct page *);
+        int (*sync_page)(struct page *);
+
+        /* Write back some dirty pages from this mapping. */
+        int (*writepages)(struct address_space *, struct writeback_control *);
+
+        /* Set a page dirty */
+        int (*set_page_dirty)(struct page *page);
+
+        int (*readpages)(struct file *filp, struct address_space *mapping,
+                        struct list_head *pages, unsigned nr_pages);
+
+        /*
+         * ext3 requires that a successful prepare_write() call be followed
+         * by a commit_write() call - they must be balanced
+         */
+        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 */
+        sector_t (*bmap)(struct address_space *, sector_t);
+        int (*invalidatepage) (struct page *, unsigned long);
+        int (*releasepage) (struct page *, int);
+        ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
+                        loff_t offset, unsigned long nr_segs);
+};
+
+struct backing_dev_info;
+struct address_space {
+        struct inode            *host;          /* owner: inode, block_device */
+        struct radix_tree_root  page_tree;      /* radix tree of all pages */
+        rwlock_t                tree_lock;      /* and rwlock protecting it */
+        unsigned int            i_mmap_writable;/* count VM_SHARED mappings */
+        struct prio_tree_root   i_mmap;         /* tree of private and shared mappings */
+        struct list_head        i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
+        spinlock_t              i_mmap_lock;    /* protect tree, count, list */
+        unsigned int            truncate_count; /* Cover race condition with truncate */
+        unsigned long           nrpages;        /* number of total pages */
+        pgoff_t                 writeback_index;/* writeback starts here */
+        struct address_space_operations *a_ops; /* methods */
+        unsigned long           flags;          /* error bits/gfp mask */
+        struct backing_dev_info *backing_dev_info; /* device readahead, etc */
+        spinlock_t              private_lock;   /* for use by the address_space */
+        struct list_head        private_list;   /* ditto */
+        struct address_space    *assoc_mapping; /* ditto */
+} __attribute__((aligned(sizeof(long))));
+        /*
+         * On most architectures that alignment is already the case; but
+         * must be enforced here for CRIS, to let the least signficant bit
+         * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
+         */
+
+struct block_device {
+        dev_t                   bd_dev;  /* not a kdev_t - it's a search key */
+        struct inode *          bd_inode;       /* will die */
+        int                     bd_openers;
+        struct semaphore        bd_sem; /* open/close mutex */
+        struct semaphore        bd_mount_sem;   /* mount mutex */
+        struct list_head        bd_inodes;
+        void *                  bd_holder;
+        int                     bd_holders;
+        struct block_device *   bd_contains;
+        unsigned                bd_block_size;
+        struct hd_struct *      bd_part;
+        /* number of times partitions within this device have been opened. */
+        unsigned                bd_part_count;
+        int                     bd_invalidated;
+        struct gendisk *        bd_disk;
+        struct list_head        bd_list;
+        struct backing_dev_info *bd_inode_backing_dev_info;
+        /*
+         * Private data.  You must have bd_claim'ed the block_device
+         * to use this.  NOTE:  bd_claim allows an owner to claim
+         * the same device multiple times, the owner must take special
+         * care to not mess up bd_private for that case.
+         */
+        unsigned long           bd_private;
+};
+
+/*
+ * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
+ * radix trees
+ */
+#define PAGECACHE_TAG_DIRTY     0
+#define PAGECACHE_TAG_WRITEBACK 1
+
+int mapping_tagged(struct address_space *mapping, int tag);
+
+/*
+ * Might pages of this file be mapped into userspace?
+ */
+static inline int mapping_mapped(struct address_space *mapping)
+{
+        return  !prio_tree_empty(&mapping->i_mmap) ||
+                !list_empty(&mapping->i_mmap_nonlinear);
+}
+
+/*
+ * Might pages of this file have been modified in userspace?
+ * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff
+ * marks vma as VM_SHARED if it is shared, and the file was opened for
+ * writing i.e. vma may be mprotected writable even if now readonly.
+ */
+static inline int mapping_writably_mapped(struct address_space *mapping)
+{
+        return mapping->i_mmap_writable != 0;
+}
+
+/*
+ * Use sequence counter to get consistent i_size on 32-bit processors.
+ */
+#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
+#include <linux/seqlock.h>
+#define __NEED_I_SIZE_ORDERED
+#define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount)
+#else
+#define i_size_ordered_init(inode) do { } while (0)
+#endif
+
+struct inode {
+        struct hlist_node       i_hash;
+        struct list_head        i_list;
+        struct list_head        i_sb_list;
+        struct list_head        i_dentry;
+        unsigned long           i_ino;
+        atomic_t                i_count;
+        umode_t                 i_mode;
+        unsigned int            i_nlink;
+        uid_t                   i_uid;
+        gid_t                   i_gid;
+        dev_t                   i_rdev;
+        loff_t                  i_size;
+        struct timespec         i_atime;
+        struct timespec         i_mtime;
+        struct timespec         i_ctime;
+        unsigned int            i_blkbits;
+        unsigned long           i_blksize;
+        unsigned long           i_version;
+        unsigned long           i_blocks;
+        unsigned short          i_bytes;
+        spinlock_t              i_lock; /* i_blocks, i_bytes, maybe i_size */
+        struct semaphore        i_sem;
+        struct rw_semaphore     i_alloc_sem;
+        struct inode_operations *i_op;
+        struct file_operations  *i_fop; /* former ->i_op->default_file_ops */
+        struct super_block      *i_sb;
+        struct file_lock        *i_flock;
+        struct address_space    *i_mapping;
+        struct address_space    i_data;
+#ifdef CONFIG_QUOTA
+        struct dquot            *i_dquot[MAXQUOTAS];
+#endif
+        /* These three should probably be a union */
+        struct list_head        i_devices;
+        struct pipe_inode_info  *i_pipe;
+        struct block_device     *i_bdev;
+        struct cdev             *i_cdev;
+        int                     i_cindex;
+
+        __u32                   i_generation;
+
+#ifdef CONFIG_DNOTIFY
+        unsigned long           i_dnotify_mask; /* Directory notify events */
+        struct dnotify_struct   *i_dnotify; /* for directory notifications */
+#endif
+
+        unsigned long           i_state;
+        unsigned long           dirtied_when;   /* jiffies of first dirtying */
+
+        unsigned int            i_flags;
+
+        atomic_t                i_writecount;
+        void                    *i_security;
+        union {
+                void            *generic_ip;
+        } u;
+#ifdef __NEED_I_SIZE_ORDERED
+        seqcount_t              i_size_seqcount;
+#endif
+};
+
+/*
+ * NOTE: in a 32bit arch with a preemptable kernel and
+ * an UP compile the i_size_read/write must be atomic
+ * with respect to the local cpu (unlike with preempt disabled),
+ * but they don't need to be atomic with respect to other cpus like in
+ * true SMP (so they need either to either locally disable irq around
+ * the read or for example on x86 they can be still implemented as a
+ * cmpxchg8b without the need of the lock prefix). For SMP compiles
+ * and 64bit archs it makes no difference if preempt is enabled or not.
+ */
+static inline loff_t i_size_read(struct inode *inode)
+{
+#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
+        loff_t i_size;
+        unsigned int seq;
+
+        do {
+                seq = read_seqcount_begin(&inode->i_size_seqcount);
+                i_size = inode->i_size;
+        } while (read_seqcount_retry(&inode->i_size_seqcount, seq));
+        return i_size;
+#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
+        loff_t i_size;
+
+        preempt_disable();
+        i_size = inode->i_size;
+        preempt_enable();
+        return i_size;
+#else
+        return inode->i_size;
+#endif
+}
+
+
+static inline void i_size_write(struct inode *inode, loff_t i_size)
+{
+#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
+        write_seqcount_begin(&inode->i_size_seqcount);
+        inode->i_size = i_size;
+        write_seqcount_end(&inode->i_size_seqcount);
+#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
+        preempt_disable();
+        inode->i_size = i_size;
+        preempt_enable();
+#else
+        inode->i_size = i_size;
+#endif
+}
+
+static inline unsigned iminor(struct inode *inode)
+{
+        return MINOR(inode->i_rdev);
+}
+
+static inline unsigned imajor(struct inode *inode)
+{
+        return MAJOR(inode->i_rdev);
+}
+
+extern struct block_device *I_BDEV(struct inode *inode);
+
+struct fown_struct {
+        rwlock_t lock;          /* protects pid, uid, euid fields */
+        int pid;                /* pid or -pgrp where SIGIO should be sent */
+        uid_t uid, euid;        /* uid/euid of process setting the owner */
+        void *security;
+        int signum;             /* posix.1b rt signal to be delivered on IO */
+};
+
+/*
+ * Track a single file's readahead state
+ */
+struct file_ra_state {
+        unsigned long start;            /* Current window */
+        unsigned long size;
+        unsigned long flags;            /* ra flags RA_FLAG_xxx*/
+        unsigned long cache_hit;        /* cache hit count*/
+        unsigned long prev_page;        /* Cache last read() position */
+        unsigned long ahead_start;      /* Ahead window */
+        unsigned long ahead_size;
+        unsigned long ra_pages;         /* Maximum readahead window */
+        unsigned long mmap_hit;         /* Cache hit stat for mmap accesses */
+        unsigned long mmap_miss;        /* Cache miss stat for mmap accesses */
+};
+#define RA_FLAG_MISS 0x01       /* a cache miss occured against this file */
+#define RA_FLAG_INCACHE 0x02    /* file is already in cache */
+
+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;
+        int                     f_error;
+        loff_t                  f_pos;
+        struct fown_struct      f_owner;
+        unsigned int            f_uid, f_gid;
+        struct file_ra_state    f_ra;
+
+        size_t                  f_maxcount;
+        unsigned long           f_version;
+        void                    *f_security;
+
+        /* needed for tty driver, and maybe others */
+        void                    *private_data;
+
+#ifdef CONFIG_EPOLL
+        /* Used by fs/eventpoll.c to link all the hooks to this file */
+        struct list_head        f_ep_links;
+        spinlock_t              f_ep_lock;
+#endif /* #ifdef CONFIG_EPOLL */
+        struct address_space    *f_mapping;
+};
+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)
+
+#define MAX_NON_LFS     ((1UL<<31) - 1)
+
+/* Page cache limit. The filesystems should put that into their s_maxbytes 
+   limits, otherwise bad things can happen in VM. */ 
+#if BITS_PER_LONG==32
+#define MAX_LFS_FILESIZE        (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) 
+#elif BITS_PER_LONG==64
+#define MAX_LFS_FILESIZE        0x7fffffffffffffffUL
+#endif
+
+#define FL_POSIX        1
+#define FL_FLOCK        2
+#define FL_ACCESS       8       /* not trying to lock, just looking */
+#define FL_LOCKD        16      /* lock held by rpc.lockd */
+#define FL_LEASE        32      /* lease held on this file */
+#define FL_SLEEP        128     /* A blocking lock */
+
+/*
+ * 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_operations {
+        void (*fl_insert)(struct file_lock *);  /* lock insertion callback */
+        void (*fl_remove)(struct file_lock *);  /* lock removal callback */
+        void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
+        void (*fl_release_private)(struct file_lock *);
+};
+
+struct lock_manager_operations {
+        int (*fl_compare_owner)(struct file_lock *, struct file_lock *);
+        void (*fl_notify)(struct file_lock *);  /* unblock callback */
+        void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
+        void (*fl_release_private)(struct file_lock *);
+        void (*fl_break)(struct file_lock *);
+        int (*fl_mylease)(struct file_lock *, struct file_lock *);
+        int (*fl_change)(struct file_lock **, int);
+};
+
+/* that will die - we need it for nfs_lock_info */
+#include <linux/nfs_fs_i.h>
+
+struct file_lock {
+        struct file_lock *fl_next;      /* singly linked list for this inode  */
+        struct list_head fl_link;       /* doubly linked list of all locks */
+        struct list_head fl_block;      /* circular list of blocked processes */
+        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;
+
+        struct fasync_struct *  fl_fasync; /* for lease break notifications */
+        unsigned long fl_break_time;    /* for nonblocking lease breaks */
+
+        struct file_lock_operations *fl_ops;    /* Callbacks for filesystems */
+        struct lock_manager_operations *fl_lmops;       /* Callbacks for lockmanagers */
+        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)
+#define OFFT_OFFSET_MAX INT_LIMIT(off_t)
+#endif
+
+extern struct list_head file_lock_list;
+
+#include <linux/fcntl.h>
+
+extern int fcntl_getlk(struct file *, struct flock __user *);
+extern int fcntl_setlk(struct file *, unsigned int, struct flock __user *);
+
+#if BITS_PER_LONG == 32
+extern int fcntl_getlk64(struct file *, struct flock64 __user *);
+extern int fcntl_setlk64(struct file *, unsigned int, struct flock64 __user *);
+#endif
+
+extern void send_sigio(struct fown_struct *fown, int fd, int band);
+extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
+extern int fcntl_getlease(struct file *filp);
+
+/* fs/locks.c */
+extern void locks_init_lock(struct file_lock *);
+extern void locks_copy_lock(struct file_lock *, struct file_lock *);
+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 *);
+extern int posix_lock_file_wait(struct file *, struct file_lock *);
+extern void posix_block_lock(struct file_lock *, struct file_lock *);
+extern void posix_unblock_lock(struct file *, struct file_lock *);
+extern int posix_locks_deadlock(struct file_lock *, struct file_lock *);
+extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl);
+extern int __break_lease(struct inode *inode, unsigned int flags);
+extern void lease_get_mtime(struct inode *, struct timespec *time);
+extern int setlease(struct file *, long, struct file_lock **);
+extern int lease_modify(struct file_lock **, int);
+extern int lock_may_read(struct inode *, loff_t start, unsigned long count);
+extern int lock_may_write(struct inode *, loff_t start, unsigned long count);
+extern void steal_locks(fl_owner_t from);
+
+struct fasync_struct {
+        int     magic;
+        int     fa_fd;
+        struct  fasync_struct   *fa_next; /* singly linked list */
+        struct  file            *fa_file;
+};
+
+#define FASYNC_MAGIC 0x4601
+
+/* SMP safe fasync helpers: */
+extern int fasync_helper(int, struct file *, int, struct fasync_struct **);
+/* can be called from interrupts */
+extern void kill_fasync(struct fasync_struct **, int, int);
+/* only for net: no internal synchronization */
+extern void __kill_fasync(struct fasync_struct *, int, int);
+
+extern int f_setown(struct file *filp, unsigned long arg, int force);
+extern void f_delown(struct file *filp);
+extern int send_sigurg(struct fown_struct *fown);
+
+/*
+ *      Umount options
+ */
+
+#define MNT_FORCE       0x00000001      /* Attempt to forcibily umount */
+#define MNT_DETACH      0x00000002      /* Just detach from the tree */
+#define MNT_EXPIRE      0x00000004      /* Mark for expiry */
+
+extern struct list_head super_blocks;
+extern spinlock_t sb_lock;
+
+#define sb_entry(list)  list_entry((list), struct super_block, s_list)
+#define S_BIAS (1<<30)
+struct super_block {
+        struct list_head        s_list;         /* Keep this first */
+        dev_t                   s_dev;          /* search index; _not_ kdev_t */
+        unsigned long           s_blocksize;
+        unsigned long           s_old_blocksize;
+        unsigned char           s_blocksize_bits;
+        unsigned char           s_dirt;
+        unsigned long long      s_maxbytes;     /* Max file size */
+        struct file_system_type *s_type;
+        struct super_operations *s_op;
+        struct dquot_operations *dq_op;
+        struct quotactl_ops     *s_qcop;
+        struct export_operations *s_export_op;
+        unsigned long           s_flags;
+        unsigned long           s_magic;
+        struct dentry           *s_root;
+        struct rw_semaphore     s_umount;
+        struct semaphore        s_lock;
+        int                     s_count;
+        int                     s_syncing;
+        int                     s_need_sync_fs;
+        atomic_t                s_active;
+        void                    *s_security;
+        struct xattr_handler    **s_xattr;
+
+        struct list_head        s_inodes;       /* all inodes */
+        struct list_head        s_dirty;        /* dirty inodes */
+        struct list_head        s_io;           /* parked for writeback */
+        struct hlist_head       s_anon;         /* anonymous dentries for (nfs) exporting */
+        struct list_head        s_files;
+
+        struct block_device     *s_bdev;
+        struct list_head        s_instances;
+        struct quota_info       s_dquot;        /* Diskquota specific options */
+
+        int                     s_frozen;
+        wait_queue_head_t       s_wait_unfrozen;
+
+        char s_id[32];                          /* Informational name */
+
+        void                    *s_fs_info;     /* Filesystem private info */
+
+        /*
+         * 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 */
+
+        /* Granuality of c/m/atime in ns.
+           Cannot be worse than a second */
+        u32                s_time_gran;
+};
+
+extern struct timespec current_fs_time(struct super_block *sb);
+
+/*
+ * Snapshotting support.
+ */
+enum {
+        SB_UNFROZEN = 0,
+        SB_FREEZE_WRITE = 1,
+        SB_FREEZE_TRANS = 2,
+};
+
+#define vfs_check_frozen(sb, level) \
+        wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
+
+/*
+ * Superblock locking.
+ */
+static inline void lock_super(struct super_block * sb)
+{
+        down(&sb->s_lock);
+}
+
+static inline void unlock_super(struct super_block * sb)
+{
+        up(&sb->s_lock);
+}
+
+/*
+ * VFS helper functions..
+ */
+extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *);
+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 *, int);
+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 *);
+
+/*
+ * VFS dentry helper functions.
+ */
+extern void dentry_unhash(struct dentry *dentry);
+
+/*
+ * File types
+ *
+ * NOTE! These match bits 12..15 of stat.st_mode
+ * (ie "(i_mode >> 12) & 15").
+ */
+#define DT_UNKNOWN      0
+#define DT_FIFO         1
+#define DT_CHR          2
+#define DT_DIR          4
+#define DT_BLK          6
+#define DT_REG          8
+#define DT_LNK          10
+#define DT_SOCK         12
+#define DT_WHT          14
+
+#define OSYNC_METADATA  (1<<0)
+#define OSYNC_DATA      (1<<1)
+#define OSYNC_INODE     (1<<2)
+int generic_osync_inode(struct inode *, struct address_space *, int);
+
+/*
+ * 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, loff_t, ino_t, unsigned);
+
+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);
+        long (*compat_ioctl) (struct file *, unsigned, unsigned long);
+        int (*media_changed) (struct gendisk *);
+        int (*revalidate_disk) (struct gendisk *);
+        struct module *owner;
+};
+
+/*
+ * "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;
+        union {
+                char __user * buf;
+                void *data;
+        } arg;
+        int error;
+} read_descriptor_t;
+
+typedef int (*read_actor_t)(read_descriptor_t *, struct page *, unsigned long, unsigned long);
+
+/* These macros are for out of kernel modules to test that
+ * the kernel supports the unlocked_ioctl and compat_ioctl
+ * fields in struct file_operations. */
+#define HAVE_COMPAT_IOCTL 1
+#define HAVE_UNLOCKED_IOCTL 1
+
+/*
+ * NOTE:
+ * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl
+ * can be called without the big kernel lock held in all filesystems.
+ */
+struct file_operations {
+        struct module *owner;
+        loff_t (*llseek) (struct file *, loff_t, int);
+        ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
+        ssize_t (*aio_read) (struct kiocb *, char __user *, size_t, loff_t);
+        ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
+        ssize_t (*aio_write) (struct kiocb *, const char __user *, 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);
+        long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
+        long (*compat_ioctl) (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 datasync);
+        int (*aio_fsync) (struct kiocb *, int datasync);
+        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 *);
+        ssize_t (*sendfile) (struct file *, loff_t *, size_t, read_actor_t, void *);
+        ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
+        unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
+        int (*check_flags)(int);
+        int (*dir_notify)(struct file *filp, unsigned long arg);
+        int (*flock) (struct file *, int, struct file_lock *);
+};
+
+struct inode_operations {
+        int (*create) (struct inode *,struct dentry *,int, struct nameidata *);
+        struct dentry * (*lookup) (struct inode *,struct dentry *, struct nameidata *);
+        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,dev_t);
+        int (*rename) (struct inode *, struct dentry *,
+                        struct inode *, struct dentry *);
+        int (*readlink) (struct dentry *, char __user *,int);
+        int (*follow_link) (struct dentry *, struct nameidata *);
+        void (*put_link) (struct dentry *, struct nameidata *);
+        void (*truncate) (struct inode *);
+        int (*permission) (struct inode *, int, struct nameidata *);
+        int (*setattr) (struct dentry *, struct iattr *);
+        int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
+        int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
+        ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
+        ssize_t (*listxattr) (struct dentry *, char *, size_t);
+        int (*removexattr) (struct dentry *, const char *);
+};
+
+struct seq_file;
+
+extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
+extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
+extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
+                unsigned long, loff_t *);
+extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
+                unsigned long, loff_t *);
+
+/*
+ * NOTE: write_inode, delete_inode, clear_inode, put_inode can be called
+ * without the big kernel lock held in all filesystems.
+ */
+struct super_operations {
+        struct inode *(*alloc_inode)(struct super_block *sb);
+        void (*destroy_inode)(struct inode *);
+
+        void (*read_inode) (struct inode *);
+  
+        void (*dirty_inode) (struct inode *);
+        int (*write_inode) (struct inode *, int);
+        void (*put_inode) (struct inode *);
+        void (*drop_inode) (struct inode *);
+        void (*delete_inode) (struct inode *);
+        void (*put_super) (struct super_block *);
+        void (*write_super) (struct super_block *);
+        int (*sync_fs)(struct super_block *sb, int wait);
+        void (*write_super_lockfs) (struct super_block *);
+        void (*unlockfs) (struct super_block *);
+        int (*statfs) (struct super_block *, struct kstatfs *);
+        int (*remount_fs) (struct super_block *, int *, char *);
+        void (*clear_inode) (struct inode *);
+        void (*umount_begin) (struct super_block *);
+
+        int (*show_options)(struct seq_file *, struct vfsmount *);
+
+        ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
+        ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
+};
+
+/* Inode state bits.  Protected by inode_lock. */
+#define I_DIRTY_SYNC            1 /* Not dirty enough for O_DATASYNC */
+#define I_DIRTY_DATASYNC        2 /* Data-related inode changes pending */
+#define I_DIRTY_PAGES           4 /* Data-related inode changes pending */
+#define __I_LOCK                3
+#define I_LOCK                  (1 << __I_LOCK)
+#define I_FREEING               16
+#define I_CLEAR                 32
+#define I_NEW                   64
+
+#define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
+
+extern void __mark_inode_dirty(struct inode *, int);
+static inline void mark_inode_dirty(struct inode *inode)
+{
+        __mark_inode_dirty(inode, I_DIRTY);
+}
+
+static inline void mark_inode_dirty_sync(struct inode *inode)
+{
+        __mark_inode_dirty(inode, I_DIRTY_SYNC);
+}
+
+static inline void touch_atime(struct vfsmount *mnt, struct dentry *dentry)
+{
+        /* per-mountpoint checks will go here */
+        update_atime(dentry->d_inode);
+}
+
+static inline void file_accessed(struct file *file)
+{
+        if (!(file->f_flags & O_NOATIME))
+                touch_atime(file->f_vfsmnt, file->f_dentry);
+}
+
+int sync_inode(struct inode *inode, struct writeback_control *wbc);
+
+/**
+ * &export_operations - for nfsd to communicate with file systems
+ * decode_fh:      decode a file handle fragment and return a &struct dentry
+ * encode_fh:      encode a file handle fragment from a dentry
+ * get_name:       find the name for a given inode in a given directory
+ * get_parent:     find the parent of a given directory
+ * get_dentry:     find a dentry for the inode given a file handle sub-fragment
+ *
+ * Description:
+ *    The export_operations structure provides a means for nfsd to communicate
+ *    with a particular exported file system  - particularly enabling nfsd and
+ *    the filesystem to co-operate when dealing with file handles.
+ *
+ *    export_operations contains two basic operation for dealing with file handles,
+ *    decode_fh() and encode_fh(), and allows for some other operations to be defined
+ *    which standard helper routines use to get specific information from the
+ *    filesystem.
+ *
+ *    nfsd encodes information use to determine which filesystem a filehandle
+ *    applies to in the initial part of the file handle.  The remainder, termed a
+ *    file handle fragment, is controlled completely by the filesystem.
+ *    The standard helper routines assume that this fragment will contain one or two
+ *    sub-fragments, one which identifies the file, and one which may be used to
+ *    identify the (a) directory containing the file.
+ *
+ *    In some situations, nfsd needs to get a dentry which is connected into a
+ *    specific part of the file tree.  To allow for this, it passes the function
+ *    acceptable() together with a @context which can be used to see if the dentry
+ *    is acceptable.  As there can be multiple dentrys for a given file, the filesystem
+ *    should check each one for acceptability before looking for the next.  As soon
+ *    as an acceptable one is found, it should be returned.
+ *
+ * decode_fh:
+ *    @decode_fh is given a &struct super_block (@sb), a file handle fragment (@fh, @fh_len)
+ *    and an acceptability testing function (@acceptable, @context).  It should return
+ *    a &struct dentry which refers to the same file that the file handle fragment refers
+ *    to,  and which passes the acceptability test.  If it cannot, it should return
+ *    a %NULL pointer if the file was found but no acceptable &dentries were available, or
+ *    a %ERR_PTR error code indicating why it couldn't be found (e.g. %ENOENT or %ENOMEM).
+ *
+ * encode_fh:
+ *    @encode_fh should store in the file handle fragment @fh (using at most @max_len bytes)
+ *    information that can be used by @decode_fh to recover the file refered to by the
+ *    &struct dentry @de.  If the @connectable flag is set, the encode_fh() should store
+ *    sufficient information so that a good attempt can be made to find not only
+ *    the file but also it's place in the filesystem.   This typically means storing
+ *    a reference to de->d_parent in the filehandle fragment.
+ *    encode_fh() should return the number of bytes stored or a negative error code
+ *    such as %-ENOSPC
+ *
+ * get_name:
+ *    @get_name should find a name for the given @child in the given @parent directory.
+ *    The name should be stored in the @name (with the understanding that it is already
+ *    pointing to a a %NAME_MAX+1 sized buffer.   get_name() should return %0 on success,
+ *    a negative error code or error.
+ *    @get_name will be called without @parent->i_sem held.
+ *
+ * get_parent:
+ *    @get_parent should find the parent directory for the given @child which is also
+ *    a directory.  In the event that it cannot be found, or storage space cannot be
+ *    allocated, a %ERR_PTR should be returned.
+ *
+ * get_dentry:
+ *    Given a &super_block (@sb) and a pointer to a file-system specific inode identifier,
+ *    possibly an inode number, (@inump) get_dentry() should find the identified inode and
+ *    return a dentry for that inode.
+ *    Any suitable dentry can be returned including, if necessary, a new dentry created
+ *    with d_alloc_root.  The caller can then find any other extant dentrys by following the
+ *    d_alias links.  If a new dentry was created using d_alloc_root, DCACHE_NFSD_DISCONNECTED
+ *    should be set, and the dentry should be d_rehash()ed.
+ *
+ *    If the inode cannot be found, either a %NULL pointer or an %ERR_PTR code can be returned.
+ *    The @inump will be whatever was passed to nfsd_find_fh_dentry() in either the
+ *    @obj or @parent parameters.
+ *
+ * Locking rules:
+ *  get_parent is called with child->d_inode->i_sem down
+ *  get_name is not (which is possibly inconsistent)
+ */
+
+struct export_operations {
+        struct dentry *(*decode_fh)(struct super_block *sb, __u32 *fh, int fh_len, int fh_type,
+                         int (*acceptable)(void *context, struct dentry *de),
+                         void *context);
+        int (*encode_fh)(struct dentry *de, __u32 *fh, int *max_len,
+                         int connectable);
+
+        /* the following are only called from the filesystem itself */
+        int (*get_name)(struct dentry *parent, char *name,
+                        struct dentry *child);
+        struct dentry * (*get_parent)(struct dentry *child);
+        struct dentry * (*get_dentry)(struct super_block *sb, void *inump);
+
+        /* This is set by the exporting module to a standard helper */
+        struct dentry * (*find_exported_dentry)(
+                struct super_block *sb, void *obj, void *parent,
+                int (*acceptable)(void *context, struct dentry *de),
+                void *context);
+
+
+};
+
+extern struct dentry *
+find_exported_dentry(struct super_block *sb, void *obj, void *parent,
+                     int (*acceptable)(void *context, struct dentry *de),
+                     void *context);
+
+struct file_system_type {
+        const char *name;
+        int fs_flags;
+        struct super_block *(*get_sb) (struct file_system_type *, int,
+                                       const char *, void *);
+        void (*kill_sb) (struct super_block *);
+        struct module *owner;
+        struct file_system_type * next;
+        struct list_head fs_supers;
+};
+
+struct super_block *get_sb_bdev(struct file_system_type *fs_type,
+        int flags, const char *dev_name, void *data,
+        int (*fill_super)(struct super_block *, void *, int));
+struct super_block *get_sb_single(struct file_system_type *fs_type,
+        int flags, void *data,
+        int (*fill_super)(struct super_block *, void *, int));
+struct super_block *get_sb_nodev(struct file_system_type *fs_type,
+        int flags, void *data,
+        int (*fill_super)(struct super_block *, void *, int));
+void generic_shutdown_super(struct super_block *sb);
+void kill_block_super(struct super_block *sb);
+void kill_anon_super(struct super_block *sb);
+void kill_litter_super(struct super_block *sb);
+void deactivate_super(struct super_block *sb);
+int set_anon_super(struct super_block *s, void *data);
+struct super_block *sget(struct file_system_type *type,
+                        int (*test)(struct super_block *,void *),
+                        int (*set)(struct super_block *,void *),
+                        void *data);
+struct super_block *get_sb_pseudo(struct file_system_type *, char *,
+                        struct super_operations *ops, unsigned long);
+int __put_super(struct super_block *sb);
+int __put_super_and_need_restart(struct super_block *sb);
+void unnamed_dev_init(void);
+
+/* Alas, no aliases. Too much hassle with bringing module.h everywhere */
+#define fops_get(fops) \
+        (((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
+#define fops_put(fops) \
+        do { if (fops) module_put((fops)->owner); } while(0)
+
+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 int may_umount_tree(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 kstatfs *);
+
+#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;
+}
+
+extern int rw_verify_area(int, struct file *, loff_t *, size_t);
+
+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,
+                        (size < inode->i_size ? inode->i_size - size
+                         : size - inode->i_size)
+                );
+        return 0;
+}
+
+static inline int break_lease(struct inode *inode, unsigned int mode)
+{
+        if (inode->i_flock)
+                return __break_lease(inode, mode);
+        return 0;
+}
+
+/* fs/open.c */
+
+extern int do_truncate(struct dentry *, loff_t start);
+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 __user *);
+
+/* fs/dcache.c */
+extern void __init vfs_caches_init_early(void);
+extern void __init vfs_caches_init(unsigned long);
+
+#define __getname()     kmem_cache_alloc(names_cachep, SLAB_KERNEL)
+#define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
+#ifndef CONFIG_AUDITSYSCALL
+#define putname(name)   __putname(name)
+#else
+extern void putname(const char *name);
+#endif
+
+extern int register_blkdev(unsigned int, const char *);
+extern int unregister_blkdev(unsigned int, const char *);
+extern struct block_device *bdget(dev_t);
+extern void bd_set_size(struct block_device *, loff_t size);
+extern void bd_forget(struct inode *inode);
+extern void bdput(struct block_device *);
+extern struct block_device *open_by_devnum(dev_t, unsigned);
+extern struct file_operations def_blk_fops;
+extern struct address_space_operations def_blk_aops;
+extern struct file_operations def_chr_fops;
+extern struct file_operations bad_sock_fops;
+extern struct file_operations def_fifo_fops;
+extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
+extern int blkdev_ioctl(struct inode *, struct file *, unsigned, unsigned long);
+extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
+extern int blkdev_get(struct block_device *, mode_t, unsigned);
+extern int blkdev_put(struct block_device *);
+extern int bd_claim(struct block_device *, void *);
+extern void bd_release(struct block_device *);
+
+/* fs/char_dev.c */
+extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
+extern int register_chrdev_region(dev_t, unsigned, const char *);
+extern int register_chrdev(unsigned int, const char *,
+                           struct file_operations *);
+extern int unregister_chrdev(unsigned int, const char *);
+extern void unregister_chrdev_region(dev_t, unsigned);
+extern int chrdev_open(struct inode *, struct file *);
+
+/* fs/block_dev.c */
+#define BDEVNAME_SIZE   32      /* Largest string for a blockdev identifier */
+extern const char *__bdevname(dev_t, char *buffer);
+extern const char *bdevname(struct block_device *bdev, char *buffer);
+extern struct block_device *lookup_bdev(const char *);
+extern struct block_device *open_bdev_excl(const char *, int, void *);
+extern void close_bdev_excl(struct block_device *);
+
+extern void init_special_inode(struct inode *, umode_t, dev_t);
+
+/* 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 *);
+
+/*
+ * return READ, READA, or WRITE
+ */
+#define bio_rw(bio)             ((bio)->bi_rw & (RW_MASK | RWA_MASK))
+
+/*
+ * return data direction, READ or WRITE
+ */
+#define bio_data_dir(bio)       ((bio)->bi_rw & 1)
+
+extern int check_disk_change(struct block_device *);
+extern int invalidate_inodes(struct super_block *);
+extern int __invalidate_device(struct block_device *, int);
+extern int invalidate_partition(struct gendisk *, int);
+unsigned long invalidate_mapping_pages(struct address_space *mapping,
+                                        pgoff_t start, pgoff_t end);
+unsigned long invalidate_inode_pages(struct address_space *mapping);
+static inline void invalidate_remote_inode(struct inode *inode)
+{
+        if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
+            S_ISLNK(inode->i_mode))
+                invalidate_inode_pages(inode->i_mapping);
+}
+extern int invalidate_inode_pages2(struct address_space *mapping);
+extern int invalidate_inode_pages2_range(struct address_space *mapping,
+                                         pgoff_t start, pgoff_t end);
+extern int write_inode_now(struct inode *, int);
+extern int filemap_fdatawrite(struct address_space *);
+extern int filemap_flush(struct address_space *);
+extern int filemap_fdatawait(struct address_space *);
+extern int filemap_write_and_wait(struct address_space *mapping);
+extern int filemap_write_and_wait_range(struct address_space *mapping,
+                                        loff_t lstart, loff_t lend);
+extern void sync_supers(void);
+extern void sync_filesystems(int wait);
+extern void emergency_sync(void);
+extern void emergency_remount(void);
+extern int do_remount_sb(struct super_block *sb, int flags,
+                         void *data, int force);
+extern sector_t bmap(struct inode *, sector_t);
+extern int setattr_mask(unsigned int);
+extern int notify_change(struct dentry *, struct iattr *);
+extern int permission(struct inode *, int, struct nameidata *);
+extern int generic_permission(struct inode *, int,
+                int (*check_acl)(struct inode *, int));
+
+extern int get_write_access(struct inode *);
+extern int deny_write_access(struct file *);
+static inline void put_write_access(struct inode * inode)
+{
+        atomic_dec(&inode->i_writecount);
+}
+static inline void allow_write_access(struct file *file)
+{
+        if (file)
+                atomic_inc(&file->f_dentry->d_inode->i_writecount);
+}
+extern int do_pipe(int *);
+
+extern int open_namei(const char *, int, int, struct nameidata *);
+extern int may_open(struct nameidata *, int, int);
+
+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 *);
+
+#include <linux/err.h>
+
+/* needed for stackable file system support */
+extern loff_t default_llseek(struct file *file, loff_t offset, int origin);
+
+extern loff_t vfs_llseek(struct file *file, loff_t offset, int origin);
+
+extern void inode_init_once(struct inode *);
+extern void iput(struct inode *);
+extern struct inode * igrab(struct inode *);
+extern ino_t iunique(struct super_block *, ino_t);
+extern int inode_needs_sync(struct inode *inode);
+extern void generic_delete_inode(struct inode *inode);
+
+extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
+                int (*test)(struct inode *, void *), void *data);
+extern struct inode *ilookup(struct super_block *sb, unsigned long ino);
+
+extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *);
+extern struct inode * iget_locked(struct super_block *, unsigned long);
+extern void unlock_new_inode(struct inode *);
+
+static inline struct inode *iget(struct super_block *sb, unsigned long ino)
+{
+        struct inode *inode = iget_locked(sb, ino);
+        
+        if (inode && (inode->i_state & I_NEW)) {
+                sb->s_op->read_inode(inode);
+                unlock_new_inode(inode);
+        }
+
+        return inode;
+}
+
+extern void __iget(struct inode * inode);
+extern void clear_inode(struct inode *);
+extern void destroy_inode(struct inode *);
+extern struct inode *new_inode(struct super_block *);
+extern int remove_suid(struct dentry *);
+extern void remove_dquot_ref(struct super_block *, int, struct list_head *);
+extern struct semaphore iprune_sem;
+
+extern void __insert_inode_hash(struct inode *, unsigned long hashval);
+extern void remove_inode_hash(struct inode *);
+static inline void insert_inode_hash(struct inode *inode) {
+        __insert_inode_hash(inode, inode->i_ino);
+}
+
+extern struct file * get_empty_filp(void);
+extern void file_move(struct file *f, struct list_head *list);
+extern void file_kill(struct file *f);
+struct bio;
+extern void submit_bio(int, struct bio *);
+extern int bdev_read_only(struct block_device *);
+extern int set_blocksize(struct block_device *, int);
+extern int sb_set_blocksize(struct super_block *, int);
+extern int sb_min_blocksize(struct super_block *, int);
+
+extern int generic_file_mmap(struct file *, struct vm_area_struct *);
+extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
+extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
+extern int file_send_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
+extern ssize_t generic_file_read(struct file *, char __user *, size_t, loff_t *);
+int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk);
+extern ssize_t generic_file_write(struct file *, const char __user *, size_t, loff_t *);
+extern ssize_t generic_file_aio_read(struct kiocb *, char __user *, size_t, loff_t);
+extern ssize_t __generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t *);
+extern ssize_t generic_file_aio_write(struct kiocb *, const char __user *, size_t, loff_t);
+extern ssize_t generic_file_aio_write_nolock(struct kiocb *, const struct iovec *,
+                unsigned long, loff_t *);
+extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *,
+                unsigned long *, loff_t, loff_t *, size_t, size_t);
+extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *,
+                unsigned long, loff_t, loff_t *, size_t, ssize_t);
+extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
+extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos);
+ssize_t generic_file_write_nolock(struct file *file, const struct iovec *iov,
+                                unsigned long nr_segs, loff_t *ppos);
+extern ssize_t generic_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void *);
+extern void do_generic_mapping_read(struct address_space *mapping,
+                                    struct file_ra_state *, struct file *,
+                                    loff_t *, read_descriptor_t *, read_actor_t);
+extern void
+file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
+extern ssize_t generic_file_direct_IO(int rw, struct kiocb *iocb,
+        const struct iovec *iov, loff_t offset, unsigned long nr_segs);
+extern ssize_t generic_file_readv(struct file *filp, const struct iovec *iov, 
+        unsigned long nr_segs, loff_t *ppos);
+ssize_t generic_file_writev(struct file *filp, const struct iovec *iov, 
+                        unsigned long nr_segs, loff_t *ppos);
+extern loff_t no_llseek(struct file *file, loff_t offset, int origin);
+extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin);
+extern loff_t remote_llseek(struct file *file, loff_t offset, int origin);
+extern int generic_file_open(struct inode * inode, struct file * filp);
+extern int nonseekable_open(struct inode * inode, struct file * filp);
+
+static inline void do_generic_file_read(struct file * filp, loff_t *ppos,
+                                        read_descriptor_t * desc,
+                                        read_actor_t actor)
+{
+        do_generic_mapping_read(filp->f_mapping,
+                                &filp->f_ra,
+                                filp,
+                                ppos,
+                                desc,
+                                actor);
+}
+
+ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
+        struct block_device *bdev, const struct iovec *iov, loff_t offset,
+        unsigned long nr_segs, get_blocks_t get_blocks, dio_iodone_t end_io,
+        int lock_type);
+
+enum {
+        DIO_LOCKING = 1, /* need locking between buffered and direct access */
+        DIO_NO_LOCKING,  /* bdev; no locking at all between buffered/direct */
+        DIO_OWN_LOCKING, /* filesystem locks buffered and direct internally */
+};
+
+static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb,
+        struct inode *inode, struct block_device *bdev, const struct iovec *iov,
+        loff_t offset, unsigned long nr_segs, get_blocks_t get_blocks,
+        dio_iodone_t end_io)
+{
+        return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
+                                nr_segs, get_blocks, end_io, DIO_LOCKING);
+}
+
+static inline ssize_t blockdev_direct_IO_no_locking(int rw, struct kiocb *iocb,
+        struct inode *inode, struct block_device *bdev, const struct iovec *iov,
+        loff_t offset, unsigned long nr_segs, get_blocks_t get_blocks,
+        dio_iodone_t end_io)
+{
+        return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
+                                nr_segs, get_blocks, end_io, DIO_NO_LOCKING);
+}
+
+static inline ssize_t blockdev_direct_IO_own_locking(int rw, struct kiocb *iocb,
+        struct inode *inode, struct block_device *bdev, const struct iovec *iov,
+        loff_t offset, unsigned long nr_segs, get_blocks_t get_blocks,
+        dio_iodone_t end_io)
+{
+        return __blockdev_direct_IO(rw, iocb, inode, bdev, iov, offset,
+                                nr_segs, get_blocks, end_io, DIO_OWN_LOCKING);
+}
+
+extern struct file_operations generic_ro_fops;
+
+#define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
+
+extern int vfs_readlink(struct dentry *, char __user *, int, const char *);
+extern int vfs_follow_link(struct nameidata *, const char *);
+extern int page_readlink(struct dentry *, char __user *, int);
+extern int page_follow_link_light(struct dentry *, struct nameidata *);
+extern void page_put_link(struct dentry *, struct nameidata *);
+extern int page_symlink(struct inode *inode, const char *symname, int len);
+extern struct inode_operations page_symlink_inode_operations;
+extern int generic_readlink(struct dentry *, char __user *, int);
+extern void generic_fillattr(struct inode *, struct kstat *);
+extern int vfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
+void inode_add_bytes(struct inode *inode, loff_t bytes);
+void inode_sub_bytes(struct inode *inode, loff_t bytes);
+loff_t inode_get_bytes(struct inode *inode);
+void inode_set_bytes(struct inode *inode, loff_t bytes);
+
+extern int vfs_readdir(struct file *, filldir_t, void *);
+
+extern int vfs_stat(char __user *, struct kstat *);
+extern int vfs_lstat(char __user *, struct kstat *);
+extern int vfs_fstat(unsigned int, struct kstat *);
+
+extern int vfs_ioctl(struct file *, unsigned int, unsigned int, unsigned long);
+
+extern struct file_system_type *get_fs_type(const char *name);
+extern struct super_block *get_super(struct block_device *);
+extern struct super_block *user_get_super(dev_t);
+extern void drop_super(struct super_block *sb);
+
+extern int dcache_dir_open(struct inode *, struct file *);
+extern int dcache_dir_close(struct inode *, struct file *);
+extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
+extern int dcache_readdir(struct file *, void *, filldir_t);
+extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
+extern int simple_statfs(struct super_block *, struct kstatfs *);
+extern int simple_link(struct dentry *, struct inode *, struct dentry *);
+extern int simple_unlink(struct inode *, struct dentry *);
+extern int simple_rmdir(struct inode *, struct dentry *);
+extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
+extern int simple_sync_file(struct file *, struct dentry *, int);
+extern int simple_empty(struct dentry *);
+extern int simple_readpage(struct file *file, struct page *page);
+extern int simple_prepare_write(struct file *file, struct page *page,
+                        unsigned offset, unsigned to);
+extern int simple_commit_write(struct file *file, struct page *page,
+                                unsigned offset, unsigned to);
+
+extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *);
+extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);
+extern struct file_operations simple_dir_operations;
+extern struct inode_operations simple_dir_inode_operations;
+struct tree_descr { char *name; struct file_operations *ops; int mode; };
+struct dentry *d_alloc_name(struct dentry *, const char *);
+extern int simple_fill_super(struct super_block *, int, struct tree_descr *);
+extern int simple_pin_fs(char *name, struct vfsmount **mount, int *count);
+extern void simple_release_fs(struct vfsmount **mount, int *count);
+
+extern ssize_t simple_read_from_buffer(void __user *, size_t, loff_t *, const void *, size_t);
+
+extern int inode_change_ok(struct inode *, struct iattr *);
+extern int __must_check inode_setattr(struct inode *, struct iattr *);
+
+extern void inode_update_time(struct inode *inode, int ctime_too);
+
+static inline ino_t parent_ino(struct dentry *dentry)
+{
+        ino_t res;
+
+        spin_lock(&dentry->d_lock);
+        res = dentry->d_parent->d_inode->i_ino;
+        spin_unlock(&dentry->d_lock);
+        return res;
+}
+
+/* kernel/fork.c */
+extern int unshare_files(void);
+
+/* Transaction based IO helpers */
+
+/*
+ * An argresp is stored in an allocated page and holds the
+ * size of the argument or response, along with its content
+ */
+struct simple_transaction_argresp {
+        ssize_t size;
+        char data[0];
+};
+
+#define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp))
+
+char *simple_transaction_get(struct file *file, const char __user *buf,
+                                size_t size);
+ssize_t simple_transaction_read(struct file *file, char __user *buf,
+                                size_t size, loff_t *pos);
+int simple_transaction_release(struct inode *inode, struct file *file);
+
+static inline void simple_transaction_set(struct file *file, size_t n)
+{
+        struct simple_transaction_argresp *ar = file->private_data;
+
+        BUG_ON(n > SIMPLE_TRANSACTION_LIMIT);
+
+        /*
+         * The barrier ensures that ar->size will really remain zero until
+         * ar->data is ready for reading.
+         */
+        smp_mb();
+        ar->size = n;
+}
+
+#ifdef CONFIG_SECURITY
+static inline char *alloc_secdata(void)
+{
+        return (char *)get_zeroed_page(GFP_KERNEL);
+}
+
+static inline void free_secdata(void *secdata)
+{
+        free_page((unsigned long)secdata);
+}
+#else
+static inline char *alloc_secdata(void)
+{
+        return (char *)1;
+}
+
+static inline void free_secdata(void *secdata)
+{ }
+#endif  /* CONFIG_SECURITY */
+
+#endif /* __KERNEL__ */
+#endif /* _LINUX_FS_H */