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authorMark Fasheh <mark.fasheh@oracle.com>2007-02-16 11:46:50 -0800
committerMark Fasheh <mark.fasheh@oracle.com>2007-04-26 15:02:20 -0700
commit60b11392f1a09433740bda3048202213daa27736 (patch)
treea8687fcb0ce62b130b732d663b54a984564d28b2 /fs/ocfs2/ocfs2.h
parent25baf2da1473d9dcde1a4c7b0ab26e7d67d9bf62 (diff)
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>
Diffstat (limited to 'fs/ocfs2/ocfs2.h')
-rw-r--r--fs/ocfs2/ocfs2.h11
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