[PATCH] export/change sync_page_range/_nolock()

This exports/changes the sync_page_range/_nolock().  The fatfs needs
sync_page_range/_nolock() for expanding truncate, and changes "size_t count"
to "loff_t count".

Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 7 insertions, 5 deletions

diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index b096159086e8..beaef5c7a0ea 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -103,7 +103,9 @@ void balance_dirty_pages_ratelimited(struct address_space *mapping);
 int pdflush_operation(void (*fn)(unsigned long), unsigned long arg0);
 int do_writepages(struct address_space *mapping, struct writeback_control *wbc);
 int sync_page_range(struct inode *inode, struct address_space *mapping,
-                        loff_t pos, size_t count);
+                        loff_t pos, loff_t count);
+int sync_page_range_nolock(struct inode *inode, struct address_space *mapping,
+                           loff_t pos, loff_t count);
 
 /* pdflush.c */
 extern int nr_pdflush_threads;  /* Global so it can be exported to sysctl
diff --git a/mm/filemap.c b/mm/filemap.c
index 4ef24a397684..8fdf36508023 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -280,7 +280,7 @@ static int wait_on_page_writeback_range(struct address_space *mapping,
  * it is otherwise livelockable.
  */
 int sync_page_range(struct inode *inode, struct address_space *mapping,
-                        loff_t pos, size_t count)
+                        loff_t pos, loff_t count)
 {
         pgoff_t start = pos >> PAGE_CACHE_SHIFT;
         pgoff_t end = (pos + count - 1) >> PAGE_CACHE_SHIFT;
@@ -305,9 +305,8 @@ EXPORT_SYMBOL(sync_page_range);
  * as it forces O_SYNC writers to different parts of the same file
  * to be serialised right until io completion.
  */
-static int sync_page_range_nolock(struct inode *inode,
-                                  struct address_space *mapping,
-                                  loff_t pos, size_t count)
+int sync_page_range_nolock(struct inode *inode, struct address_space *mapping,
+                           loff_t pos, loff_t count)
 {
         pgoff_t start = pos >> PAGE_CACHE_SHIFT;
         pgoff_t end = (pos + count - 1) >> PAGE_CACHE_SHIFT;
@@ -322,6 +321,7 @@ static int sync_page_range_nolock(struct inode *inode,
                 ret = wait_on_page_writeback_range(mapping, start, end);
         return ret;
 }
+EXPORT_SYMBOL(sync_page_range_nolock);
 
 /**
  * filemap_fdatawait - walk the list of under-writeback pages of the given