Linux-2.6.12-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!
diff --git a/include/linux/fs.h b/include/linux/fs.h
new file mode 100644
index 0000000..5df687d
--- /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 */