[dm-devel] [PATCH 1/6] block: factor out a chunk_size_left helper

[Christoph Hellwig]

Factor out a helper from blk_max_size_offset so that it can be reused
independently.

Signed-off-by: Christoph Hellwig <hch at lst.de>
---
 include/linux/blkdev.h | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 17705c970d7e1..c6ecd996c2d46 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -622,6 +622,18 @@ static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,
 	return q->limits.max_sectors;
 }
 
+/*
+ * Return how much of the chunk sectors is left to be used for an I/O at the
+ * given offset.
+ */
+static inline unsigned int blk_chunk_sectors_left(sector_t offset,
+		unsigned int chunk_sectors)
+{
+	if (unlikely(!is_power_of_2(chunk_sectors)))
+		return chunk_sectors - sector_div(offset, chunk_sectors);
+	return chunk_sectors - (offset & (chunk_sectors - 1));
+}
+
 /*
  * Return maximum size of a request at given offset. Only valid for
  * file system requests.
@@ -637,12 +649,8 @@ static inline unsigned int blk_max_size_offset(struct request_queue *q,
 			return q->limits.max_sectors;
 	}
 
-	if (likely(is_power_of_2(chunk_sectors)))
-		chunk_sectors -= offset & (chunk_sectors - 1);
-	else
-		chunk_sectors -= sector_div(offset, chunk_sectors);
-
-	return min(q->limits.max_sectors, chunk_sectors);
+	return min(q->limits.max_sectors,
+			blk_chunk_sectors_left(offset, chunk_sectors));
 }
 
 /*
-- 
2.30.2