[NET] skbuff: Add skb_cow_head

[safe/jmp/linux-2.6] / include / linux / fs.h

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 75dd16e..16421f6 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -697,20 +697,26 @@ struct fown_struct {
  * 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_index;       /* Cache last read() position */
-       unsigned long ahead_start;      /* Ahead window */
-       unsigned long ahead_size;
+       pgoff_t start;                  /* where readahead started */
+       unsigned long size;             /* # of readahead pages */
+       unsigned long async_size;       /* do asynchronous readahead when
+                                          there are only # of pages ahead */
+
        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 */
+       unsigned long prev_index;       /* Cache last read() position */
        unsigned int prev_offset;       /* Offset where last read() ended in a page */
 };
-#define RA_FLAG_MISS 0x01      /* a cache miss occured against this file */
-#define RA_FLAG_INCACHE 0x02   /* file is already in cache */
+
+/*
+ * Check if @index falls in the readahead windows.
+ */
+static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index)
+{
+       return (index >= ra->start &&
+               index <  ra->start + ra->size);
+}
 
 struct file {
        /*
@@ -872,7 +878,7 @@ extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl);
 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 generic_setlease(struct file *, long, struct file_lock **);
 extern int vfs_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);
@@ -1653,7 +1659,6 @@ 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);
 int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk);
 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 struct iovec *, unsigned long, loff_t);