[PATCH] Make address_space_operations->sync_page return void

The only user ignores the return value, and the only instanace
(block_sync_page) always returns 0...
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/buffer.c

@@ -3007,7 +3007,7 @@ int try_to_free_buffers(struct page *page)
 }
 EXPORT_SYMBOL(try_to_free_buffers);
 
-int block_sync_page(struct page *page)
+void block_sync_page(struct page *page)
 {
 	struct address_space *mapping;
 
@@ -3015,7 +3015,6 @@ int block_sync_page(struct page *page)
 	mapping = page_mapping(page);
 	if (mapping)
 		blk_run_backing_dev(mapping->backing_dev_info, page);
-	return 0;
 }
 
 /*

fs/cifs/file.c

@@ -1339,7 +1339,7 @@ int cifs_fsync(struct file *file, struct dentry *dentry, int datasync)
 	return rc;
 }
 
-/* static int cifs_sync_page(struct page *page)
+/* static void cifs_sync_page(struct page *page)
 {
 	struct address_space *mapping;
 	struct inode *inode;
@@ -1353,16 +1353,18 @@ int cifs_fsync(struct file *file, struct dentry *dentry, int datasync)
 		return 0;
 	inode = mapping->host;
 	if (!inode)
-		return 0; */
+		return; */
 
 /*	fill in rpages then 
 	result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */
 
 /*	cFYI(1, ("rpages is %d for sync page of Index %ld ", rpages, index));
 
+#if 0
 	if (rc < 0)
 		return rc;
 	return 0;
+#endif
 } */
 
 /*

include/linux/buffer_head.h

@@ -200,7 +200,7 @@ int cont_prepare_write(struct page*, unsigned, unsigned, get_block_t*,
 int generic_cont_expand(struct inode *inode, loff_t size);
 int generic_cont_expand_simple(struct inode *inode, loff_t size);
 int block_commit_write(struct page *page, unsigned from, unsigned to);
-int block_sync_page(struct page *);
+void block_sync_page(struct page *);
 sector_t generic_block_bmap(struct address_space *, sector_t, get_block_t *);
 int generic_commit_write(struct file *, struct page *, unsigned, unsigned);
 int block_truncate_page(struct address_space *, loff_t, get_block_t *);

include/linux/fs.h

@@ -350,7 +350,7 @@ struct writeback_control;
 struct address_space_operations {
 	int (*writepage)(struct page *page, struct writeback_control *wbc);
 	int (*readpage)(struct file *, struct page *);
-	int (*sync_page)(struct page *);
+	void (*sync_page)(struct page *);
 
 	/* Write back some dirty pages from this mapping. */
 	int (*writepages)(struct address_space *, struct writeback_control *);