[RFC] [PATCH 2/7] reiser4: block_alloc: add a "forward" parameter to reiser4_blocknr_hint to allocate blocks only in forward direction.

[Ivan Shapovalov <intelfx100@gmail.com>]

Signed-off-by: Ivan Shapovalov <intelfx100@gmail.com>
---
 fs/reiser4/block_alloc.h         | 5 +++--
 fs/reiser4/plugin/space/bitmap.c | 3 ++-
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/fs/reiser4/block_alloc.h b/fs/reiser4/block_alloc.h
index bfc6be9..08b3941 100644
--- a/fs/reiser4/block_alloc.h
+++ b/fs/reiser4/block_alloc.h
@@ -51,9 +51,10 @@ struct reiser4_blocknr_hint {
 	/* block allocator assumes that blocks, which will be mapped to disk,
 	   are in this specified block_stage */
 	block_stage_t block_stage;
-	/* If direction = 1 allocate blocks in backward direction from the end
-	 * of disk to the beginning of disk.  */
+	/* Allocate blocks only in backward direction starting from blk. */
 	unsigned int backward:1;
+	/* Allocate blocks only in forward direction starting from blk. */
+	unsigned int forward:1;
 
 };
 
diff --git a/fs/reiser4/plugin/space/bitmap.c b/fs/reiser4/plugin/space/bitmap.c
index 3da3f6b..9beaf66 100644
--- a/fs/reiser4/plugin/space/bitmap.c
+++ b/fs/reiser4/plugin/space/bitmap.c
@@ -1127,7 +1127,8 @@ static int alloc_blocks_forward(reiser4_blocknr_hint *hint, int needed,
 	/* There is only one bitmap search if max_dist was specified or first
 	   pass was from the beginning of the bitmap. We also do one pass for
 	   scanning bitmap in backward direction. */
-	if (!(actual_len != 0 || hint->max_dist != 0 || search_start == 0)) {
+	if (actual_len == 0 && search_start != 0 &&
+	    hint->max_dist == 0 && hint->forward == 0) {
 		/* next step is a scanning from 0 to search_start */
 		search_end = search_start;
 		search_start = 0;
-- 
2.0.4