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, 11 insertions, 0 deletions

diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index 2699f7cac21a..82cc92dcf8a6 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -495,6 +495,17 @@ static inline unsigned long ocfs2_align_clusters_to_page_index(struct super_bloc
         return index;
 }
 
+static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb)
+{
+        unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
+        unsigned int pages_per_cluster = 1;
+
+        if (PAGE_CACHE_SHIFT < cbits)
+                pages_per_cluster = 1 << (cbits - PAGE_CACHE_SHIFT);
+
+        return pages_per_cluster;
+}
+
 #define ocfs2_set_bit ext2_set_bit
 #define ocfs2_clear_bit ext2_clear_bit
 #define ocfs2_test_bit ext2_test_bit