Factor out a helper from blk_max_size_offset so that it can be reused
independently.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
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..0b020bb45a3e7 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 chunk_size_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,
+ chunk_size_left(offset, chunk_sectors));
}
/*
--
2.30.2
--
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