This patch adds/exports functions to get the size of request in bytes.
They are useful because blk_end_request interfaces take bytes
as a completed I/O size instead of sectors.
Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
---
block/ll_rw_blk.c | 25 ++++++++++++++++++++++---
include/linux/blkdev.h | 8 ++++++++
2 files changed, 30 insertions(+), 3 deletions(-)
Index: 2.6.24-rc4/include/linux/blkdev.h
===================================================================
--- 2.6.24-rc4.orig/include/linux/blkdev.h
+++ 2.6.24-rc4/include/linux/blkdev.h
@@ -739,6 +739,14 @@ extern void end_dequeued_request(struct
extern void blk_complete_request(struct request *);
/*
+ * blk_end_request() takes bytes instead of sectors as a complete size.
+ * blk_rq_bytes() returns bytes left to complete in the entire request.
+ * blk_rq_cur_bytes() returns bytes left to complete in the current segment.
+ */
+extern unsigned int blk_rq_bytes(struct request *rq);
+extern unsigned int blk_rq_cur_bytes(struct request *rq);
+
+/*
* end_that_request_first/chunk() takes an uptodate argument. we account
* any value <= as an io error. 0 means -EIO for compatability reasons,
* any other < 0 value is the direct error type. An uptodate value of
Index: 2.6.24-rc4/block/ll_rw_blk.c
===================================================================
--- 2.6.24-rc4.orig/block/ll_rw_blk.c
+++ 2.6.24-rc4/block/ll_rw_blk.c
@@ -3701,13 +3701,32 @@ static inline void __end_request(struct
}
}
-static unsigned int rq_byte_size(struct request *rq)
+/**
+ * blk_rq_bytes - Returns bytes left to complete in the entire request
+ **/
+unsigned int blk_rq_bytes(struct request *rq)
{
if (blk_fs_request(rq))
return rq->hard_nr_sectors << 9;
return rq->data_len;
}
+EXPORT_SYMBOL_GPL(blk_rq_bytes);
+
+/**
+ * blk_rq_cur_bytes - Returns bytes left to complete in the current segment
+ **/
+unsigned int blk_rq_cur_bytes(struct request *rq)
+{
+ if (blk_fs_request(rq))
+ return rq->current_nr_sectors << 9;
+
+ if (rq->bio)
+ return rq->bio->bi_size;
+
+ return rq->data_len;
+}
+EXPORT_SYMBOL_GPL(blk_rq_cur_bytes);
/**
* end_queued_request - end all I/O on a queued request
@@ -3722,7 +3741,7 @@ static unsigned int rq_byte_size(struct
**/
void end_queued_request(struct request *rq, int uptodate)
{
- __end_request(rq, uptodate, rq_byte_size(rq), 1);
+ __end_request(rq, uptodate, blk_rq_bytes(rq), 1);
}
EXPORT_SYMBOL(end_queued_request);
@@ -3739,7 +3758,7 @@ EXPORT_SYMBOL(end_queued_request);
**/
void end_dequeued_request(struct request *rq, int uptodate)
{
- __end_request(rq, uptodate, rq_byte_size(rq), 0);
+ __end_request(rq, uptodate, blk_rq_bytes(rq), 0);
}
EXPORT_SYMBOL(end_dequeued_request);
--
