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authorKiyoshi Ueda <k-ueda@ct.jp.nec.com>2007-12-11 17:41:17 -0500
committerJens Axboe <jens.axboe@oracle.com>2008-01-28 10:35:56 +0100
commit3b11313a6c2a42425bf06e92528bda6affd58dec (patch)
treec2d550b2954c106387f1ebe6badb387603002202
parentblk_end_request: add new request completion interface (take 4) (diff)
downloadlinux-dev-3b11313a6c2a42425bf06e92528bda6affd58dec.tar.xz
linux-dev-3b11313a6c2a42425bf06e92528bda6affd58dec.zip
blk_end_request: add/export functions to get request size (take 4)
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> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
-rw-r--r--block/ll_rw_blk.c25
-rw-r--r--include/linux/blkdev.h8
2 files changed, 30 insertions, 3 deletions
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index 5c01911af47c..8b2b2509f60e 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -3723,13 +3723,32 @@ static inline void __end_request(struct request *rq, int uptodate,
}
}
-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
@@ -3744,7 +3763,7 @@ static unsigned int rq_byte_size(struct request *rq)
**/
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);
@@ -3761,7 +3780,7 @@ 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);
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 3b212f02db8d..aa2341df7932 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -737,6 +737,14 @@ extern void end_dequeued_request(struct request *, int);
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