diff options
| author | Mark Fasheh <mark.fasheh@oracle.com> | 2007-02-16 11:46:50 -0800 |
|---|---|---|
| committer | Mark Fasheh <mark.fasheh@oracle.com> | 2007-04-26 15:02:20 -0700 |
| commit | 60b11392f1a09433740bda3048202213daa27736 (patch) | |
| tree | a8687fcb0ce62b130b732d663b54a984564d28b2 /fs/ocfs2/ocfs2.h | |
| parent | 25baf2da1473d9dcde1a4c7b0ab26e7d67d9bf62 (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.h | 11 |
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 |