locks: add special return value for asynchronous locks

[linux-2.6-omap-h63xx.git] / include / linux / fs.h

diff --git a/include/linux/fs.h b/include/linux/fs.h
index d8e2762ed14df21bb05c50fde55158d6ec42bd5e..49d8eb7a71be2b89d9148575618d2550018a5141 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -885,6 +885,12 @@ static inline int file_check_writeable(struct file *filp)
 #define FL_CLOSE       64      /* unlock on close */
 #define FL_SLEEP       128     /* A blocking lock */
 
+/*
+ * Special return value from posix_lock_file() and vfs_lock_file() for
+ * asynchronous locking.
+ */
+#define FILE_LOCK_DEFERRED 1
+
 /*
  * The POSIX file lock owner is determined by
  * the "struct files_struct" in the thread group
@@ -918,12 +924,12 @@ struct file_lock {
        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 char fl_flags;
+       unsigned char fl_type;
        unsigned int fl_pid;
        struct pid *fl_nspid;
        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;
 
@@ -1025,6 +1031,7 @@ extern int send_sigurg(struct fown_struct *fown);
 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 */
@@ -1058,6 +1065,9 @@ struct super_block {
        struct list_head        s_more_io;      /* parked for more writeback */
        struct hlist_head       s_anon;         /* anonymous dentries for (nfs) exporting */
        struct list_head        s_files;
+       /* s_dentry_lru and s_nr_dentry_unused are protected by dcache_lock */
+       struct list_head        s_dentry_lru;   /* unused dentry lru */
+       int                     s_nr_dentry_unused;     /* # of dentry on lru */
 
        struct block_device     *s_bdev;
        struct mtd_info         *s_mtd;
@@ -1729,6 +1739,8 @@ static inline void invalidate_remote_inode(struct inode *inode)
 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 void generic_sync_sb_inodes(struct super_block *sb,
+                               struct writeback_control *wbc);
 extern int write_inode_now(struct inode *, int);
 extern int filemap_fdatawrite(struct address_space *);
 extern int filemap_flush(struct address_space *);
@@ -1740,6 +1752,8 @@ extern int wait_on_page_writeback_range(struct address_space *mapping,
                                pgoff_t start, pgoff_t end);
 extern int __filemap_fdatawrite_range(struct address_space *mapping,
                                loff_t start, loff_t end, int sync_mode);
+extern int filemap_fdatawrite_range(struct address_space *mapping,
+                               loff_t start, loff_t end);
 
 extern long do_fsync(struct file *file, int datasync);
 extern void sync_supers(void);
@@ -1769,8 +1783,9 @@ static inline void allow_write_access(struct file *file)
                atomic_inc(&file->f_path.dentry->d_inode->i_writecount);
 }
 extern int do_pipe(int *);
-extern struct file *create_read_pipe(struct file *f);
-extern struct file *create_write_pipe(void);
+extern int do_pipe_flags(int *, int);
+extern struct file *create_read_pipe(struct file *f, int flags);
+extern struct file *create_write_pipe(int flags);
 extern void free_write_pipe(struct file *);
 
 extern struct file *do_filp_open(int dfd, const char *pathname,
@@ -1870,7 +1885,8 @@ extern void
 file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
 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 loff_t generic_file_llseek_unlocked(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);
 
@@ -2001,8 +2017,6 @@ extern void simple_release_fs(struct vfsmount **mount, int *count);
 
 extern ssize_t simple_read_from_buffer(void __user *to, size_t count,
                        loff_t *ppos, const void *from, size_t available);
-extern ssize_t memory_read_from_buffer(void *to, size_t count, loff_t *ppos,
-                       const void *from, size_t available);
 
 #ifdef CONFIG_MIGRATION
 extern int buffer_migrate_page(struct address_space *,