ocfs2: zero tail of sparse files on truncate

Since we don't zero on extend anymore, truncate needs to be fixed up to zero
the part of a file between i_size and and end of it's cluster. Otherwise a
subsequent extend could expose bad data.

This introduced a new helper, which can be used in ocfs2_write().

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/fs/ocfs2/aops.h b/fs/ocfs2/aops.h
index eeb2c42483e..7d94071f0ab 100644
--- a/fs/ocfs2/aops.h
+++ b/fs/ocfs2/aops.h
@@ -30,6 +30,18 @@ handle_t *ocfs2_start_walk_page_trans(struct inode *inode,
                                                          unsigned from,
                                                          unsigned to);
 
+int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
+                          struct inode *inode, unsigned int from,
+                          unsigned int to, int new);
+
+int walk_page_buffers(  handle_t *handle,
+                        struct buffer_head *head,
+                        unsigned from,
+                        unsigned to,
+                        int *partial,
+                        int (*fn)(      handle_t *handle,
+                                        struct buffer_head *bh));
+
 struct ocfs2_write_ctxt;
 typedef int (ocfs2_page_writer)(struct inode *, struct ocfs2_write_ctxt *,
                                 u64 *, unsigned int *, unsigned int *);