ceph: pass inclusive lend parameter to filemap_write_and_wait_range()

The 'lend' parameter of filemap_write_and_wait_range is required to be
inclusive, so follow the rule. Same for invalidate_inode_pages2_range.

Signed-off-by: zhengbin <[e-mail]>
Reviewed-by: "Yan, Zheng" <[e-mail]>
Signed-off-by: Ilya Dryomov <[e-mail]>

fs/ceph/file.c

···
 	 * but it will at least behave sensibly when they are
 	 * in sequence.
 	 */
-	ret = filemap_write_and_wait_range(inode->i_mapping, off, off + len);
+	ret = filemap_write_and_wait_range(inode->i_mapping,
+					   off, off + len - 1);
 	if (ret < 0)
 		return ret;
 
···
 	     (write ? "write" : "read"), file, pos, (unsigned)count,
 	     snapc, snapc->seq);
 
-	ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
+	ret = filemap_write_and_wait_range(inode->i_mapping,
+					   pos, pos + count - 1);
 	if (ret < 0)
 		return ret;
 
 	if (write) {
 		int ret2 = invalidate_inode_pages2_range(inode->i_mapping,
 					pos >> PAGE_SHIFT,
-					(pos + count) >> PAGE_SHIFT);
+					(pos + count - 1) >> PAGE_SHIFT);
 		if (ret2 < 0)
 			dout("invalidate_inode_pages2_range returned %d\n", ret2);
 
···
 	dout("sync_write on file %p %lld~%u snapc %p seq %lld\n",
 	     file, pos, (unsigned)count, snapc, snapc->seq);
 
-	ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
+	ret = filemap_write_and_wait_range(inode->i_mapping,
+					   pos, pos + count - 1);
 	if (ret < 0)
 		return ret;
 
 	ret = invalidate_inode_pages2_range(inode->i_mapping,
 					    pos >> PAGE_SHIFT,
-					    (pos + count) >> PAGE_SHIFT);
+					    (pos + count - 1) >> PAGE_SHIFT);
 	if (ret < 0)
 		dout("invalidate_inode_pages2_range returned %d\n", ret);