nilfs2: support contiguous lookup of blocks

Although get_block() callback function can return extent of contiguous
blocks with bh->b_size, nilfs_get_block() function did not support
this feature.

This adds contiguous lookup feature to the block mapping codes of
nilfs, and allows the nilfs_get_blocks() function to return the extent
information by applying the feature.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>

1 files changed, 4 insertions, 0 deletions

diff --git a/fs/nilfs2/bmap.h b/fs/nilfs2/bmap.h
index 47f5b74713c0..b2890cdcef12 100644
--- a/fs/nilfs2/bmap.h
+++ b/fs/nilfs2/bmap.h
@@ -64,6 +64,8 @@ struct nilfs_bmap_stats {
  */
 struct nilfs_bmap_operations {
         int (*bop_lookup)(const struct nilfs_bmap *, __u64, int, __u64 *);
+        int (*bop_lookup_contig)(const struct nilfs_bmap *, __u64, __u64 *,
+                                 unsigned);
         int (*bop_insert)(struct nilfs_bmap *, __u64, __u64);
         int (*bop_delete)(struct nilfs_bmap *, __u64);
         void (*bop_clear)(struct nilfs_bmap *);
@@ -140,6 +142,7 @@ int nilfs_bmap_test_and_clear_dirty(struct nilfs_bmap *);
 int nilfs_bmap_read(struct nilfs_bmap *, struct nilfs_inode *);
 void nilfs_bmap_write(struct nilfs_bmap *, struct nilfs_inode *);
 int nilfs_bmap_lookup(struct nilfs_bmap *, unsigned long, unsigned long *);
+int nilfs_bmap_lookup_contig(struct nilfs_bmap *, __u64, __u64 *, unsigned);
 int nilfs_bmap_insert(struct nilfs_bmap *, unsigned long, unsigned long);
 int nilfs_bmap_delete(struct nilfs_bmap *, unsigned long);
 int nilfs_bmap_last_key(struct nilfs_bmap *, unsigned long *);
@@ -160,6 +163,7 @@ void nilfs_bmap_commit_gcdat(struct nilfs_bmap *, struct nilfs_bmap *);
 /*
  * Internal use only
  */
+struct inode *nilfs_bmap_get_dat(const struct nilfs_bmap *);
 int nilfs_bmap_prepare_alloc_v(struct nilfs_bmap *,
                                union nilfs_bmap_ptr_req *);
 void nilfs_bmap_commit_alloc_v(struct nilfs_bmap *,