Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=a0cd128542cd9c67f27458a08e989db486a293ce
Commit: a0cd128542cd9c67f27458a08e989db486a293ce
Parent: 992c5ddaf1b8b85d2252339c4c89adf7469c09ca
Author: Jens Axboe <[EMAIL PROTECTED]>
AuthorDate: Fri Sep 21 10:41:07 2007 +0200
Committer: Jens Axboe <[EMAIL PROTECTED]>
CommitDate: Tue Oct 16 11:03:53 2007 +0200
block: add end_queued_request() and end_dequeued_request() helpers
We can use this helper in the elevator core for BLKPREP_KILL, and it'll
also be useful for the empty barrier patch.
Signed-off-by: Jens Axboe <[EMAIL PROTECTED]>
---
block/elevator.c | 9 +-----
block/ll_rw_blk.c | 78 ++++++++++++++++++++++++++++++++++++++++++++---
include/linux/blkdev.h | 4 ++-
3 files changed, 77 insertions(+), 14 deletions(-)
diff --git a/block/elevator.c b/block/elevator.c
index b9c518a..ec23ca0 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -751,15 +751,8 @@ struct request *elv_next_request(struct request_queue *q)
rq = NULL;
break;
} else if (ret == BLKPREP_KILL) {
- int nr_bytes = rq->hard_nr_sectors << 9;
-
- if (!nr_bytes)
- nr_bytes = rq->data_len;
-
- blkdev_dequeue_request(rq);
rq->cmd_flags |= REQ_QUIET;
- end_that_request_chunk(rq, 0, nr_bytes);
- end_that_request_last(rq, 0);
+ end_queued_request(rq, 0);
} else {
printk(KERN_ERR "%s: bad return=%d\n", __FUNCTION__,
ret);
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index 0fa5d3d..8904f8b 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -3630,15 +3630,83 @@ void end_that_request_last(struct request *req, int
uptodate)
EXPORT_SYMBOL(end_that_request_last);
-void end_request(struct request *req, int uptodate)
+static inline void __end_request(struct request *rq, int uptodate,
+ unsigned int nr_bytes, int dequeue)
{
- if (!end_that_request_first(req, uptodate, req->hard_cur_sectors)) {
- add_disk_randomness(req->rq_disk);
- blkdev_dequeue_request(req);
- end_that_request_last(req, uptodate);
+ if (!end_that_request_chunk(rq, uptodate, nr_bytes)) {
+ if (dequeue)
+ blkdev_dequeue_request(rq);
+ add_disk_randomness(rq->rq_disk);
+ end_that_request_last(rq, uptodate);
}
}
+static unsigned int rq_byte_size(struct request *rq)
+{
+ if (blk_fs_request(rq))
+ return rq->hard_nr_sectors << 9;
+
+ return rq->data_len;
+}
+
+/**
+ * end_queued_request - end all I/O on a queued request
+ * @rq: the request being processed
+ * @uptodate: error value or 0/1 uptodate flag
+ *
+ * Description:
+ * Ends all I/O on a request, and removes it from the block layer queues.
+ * Not suitable for normal IO completion, unless the driver still has
+ * the request attached to the block layer.
+ *
+ **/
+void end_queued_request(struct request *rq, int uptodate)
+{
+ __end_request(rq, uptodate, rq_byte_size(rq), 1);
+}
+EXPORT_SYMBOL(end_queued_request);
+
+/**
+ * end_dequeued_request - end all I/O on a dequeued request
+ * @rq: the request being processed
+ * @uptodate: error value or 0/1 uptodate flag
+ *
+ * Description:
+ * Ends all I/O on a request. The request must already have been
+ * dequeued using blkdev_dequeue_request(), as is normally the case
+ * for most drivers.
+ *
+ **/
+void end_dequeued_request(struct request *rq, int uptodate)
+{
+ __end_request(rq, uptodate, rq_byte_size(rq), 0);
+}
+EXPORT_SYMBOL(end_dequeued_request);
+
+
+/**
+ * end_request - end I/O on the current segment of the request
+ * @rq: the request being processed
+ * @uptodate: error value or 0/1 uptodate flag
+ *
+ * Description:
+ * Ends I/O on the current segment of a request. If that is the only
+ * remaining segment, the request is also completed and freed.
+ *
+ * This is a remnant of how older block drivers handled IO completions.
+ * Modern drivers typically end IO on the full request in one go, unless
+ * they have a residual value to account for. For that case this function
+ * isn't really useful, unless the residual just happens to be the
+ * full current segment. In other words, don't use this function in new
+ * code. Either use end_request_completely(), or the
+ * end_that_request_chunk() (along with end_that_request_last()) for
+ * partial completions.
+ *
+ **/
+void end_request(struct request *req, int uptodate)
+{
+ __end_request(req, uptodate, req->hard_cur_sectors << 9, 1);
+}
EXPORT_SYMBOL(end_request);
static void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 5ed888b..6109679 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -729,7 +729,9 @@ static inline void blk_run_address_space(struct
address_space *mapping)
extern int end_that_request_first(struct request *, int, int);
extern int end_that_request_chunk(struct request *, int, int);
extern void end_that_request_last(struct request *, int);
-extern void end_request(struct request *req, int uptodate);
+extern void end_request(struct request *, int);
+extern void end_queued_request(struct request *, int);
+extern void end_dequeued_request(struct request *, int);
extern void blk_complete_request(struct request *);
/*
-
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