[RFC PATCH] f2fs-tools: fix blocks allocation direction inside segment

[Junling Zheng <zhengjunling@huawei.com>]

This fixes the block allocation direction from left to right inside
one segment despite of the direction of segment allocation.

Signed-off-by: Junling Zheng <zhengjunling@huawei.com>
---
 fsck/mount.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/fsck/mount.c b/fsck/mount.c
index 1396a2e..38d2aa2 100644
--- a/fsck/mount.c
+++ b/fsck/mount.c
@@ -1921,13 +1921,13 @@ int find_next_free_block(struct f2fs_sb_info *sbi, u64 *to, int left, int type)
 
 		if (se->valid_blocks == sbi->blocks_per_seg ||
 				IS_CUR_SEGNO(sbi, segno, type)) {
-			*to = left ? START_BLOCK(sbi, segno) - 1:
+			*to = left ? START_BLOCK(sbi, segno - 1) :
 						START_BLOCK(sbi, segno + 1);
 			continue;
 		}
 
 		if (se->valid_blocks == 0 && not_enough) {
-			*to = left ? START_BLOCK(sbi, segno) - 1:
+			*to = left ? START_BLOCK(sbi, segno - 1) :
 						START_BLOCK(sbi, segno + 1);
 			continue;
 		}
@@ -1949,7 +1949,10 @@ int find_next_free_block(struct f2fs_sb_info *sbi, u64 *to, int left, int type)
 			!f2fs_test_bit(offset, (const char *)se->cur_valid_map))
 			return 0;
 
-		*to = left ? *to - 1: *to + 1;
+		if (!(OFFSET_IN_SEG(sbi, *to + 1)) && left)
+			*to = START_BLOCK(sbi, segno - 1);
+		else
+			*to = *to + 1;
 	}
 	return -1;
 }
-- 
2.16.2


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