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authorMark Fasheh <mark.fasheh@oracle.com>2007-02-09 20:24:12 -0800
committerMark Fasheh <mark.fasheh@oracle.com>2007-04-26 15:02:08 -0700
commit9517bac6cc7a7aa4fee63cb38a32cb6014e264c7 (patch)
tree3cac0c18d0cacc316e0e8a60f483282d6f991779 /fs/ocfs2/ocfs2.h
parent89488984ac23b0580f959b9ee549f2fcb1c2f194 (diff)
ocfs2: teach ocfs2_file_aio_write() about sparse files
Unfortunately, ocfs2 can no longer make use of generic_file_aio_write_nlock() because allocating writes will require zeroing of pages adjacent to the I/O for cluster sizes greater than page size. Implement a custom file write here, which can order page locks for zeroing. This also has the advantage that cluster locks can easily be ordered outside of the page locks. Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Diffstat (limited to 'fs/ocfs2/ocfs2.h')
-rw-r--r--fs/ocfs2/ocfs2.h32
1 files changed, 32 insertions, 0 deletions
diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index faeb53f2eecf..2699f7cac21a 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -463,6 +463,38 @@ static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes)
return (unsigned long)((bytes + 511) >> 9);
}
+static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb,
+ unsigned long pg_index)
+{
+ u32 clusters = pg_index;
+ unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
+
+ if (unlikely(PAGE_CACHE_SHIFT > cbits))
+ clusters = pg_index << (PAGE_CACHE_SHIFT - cbits);
+ else if (PAGE_CACHE_SHIFT < cbits)
+ clusters = pg_index >> (cbits - PAGE_CACHE_SHIFT);
+
+ return clusters;
+}
+
+/*
+ * Find the 1st page index which covers the given clusters.
+ */
+static inline unsigned long ocfs2_align_clusters_to_page_index(struct super_block *sb,
+ u32 clusters)
+{
+ unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
+ unsigned long index = clusters;
+
+ if (PAGE_CACHE_SHIFT > cbits) {
+ index = clusters >> (PAGE_CACHE_SHIFT - cbits);
+ } else if (PAGE_CACHE_SHIFT < cbits) {
+ index = clusters << (cbits - PAGE_CACHE_SHIFT);
+ }
+
+ return index;
+}
+
#define ocfs2_set_bit ext2_set_bit
#define ocfs2_clear_bit ext2_clear_bit
#define ocfs2_test_bit ext2_test_bit