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authorTejun Heo <tj@kernel.org>2009-04-23 11:05:18 +0900
committerJens Axboe <jens.axboe@oracle.com>2009-04-28 07:37:35 +0200
commit2e60e02297cf54e367567f2d85b2ca56b1c4a906 (patch)
treeea824afcaff58be894799a011f74d80c3560f372 /block
parent0b302d5aa7975006fa2ec3d66386610b9b36c669 (diff)
downloadlinux-2e60e02297cf54e367567f2d85b2ca56b1c4a906.tar.bz2
block: clean up request completion API
Request completion has gone through several changes and became a bit messy over the time. Clean it up. 1. end_that_request_data() is a thin wrapper around end_that_request_data_first() which checks whether bio is NULL before doing anything and handles bidi completion. blk_update_request() is a thin wrapper around end_that_request_data() which clears nr_sectors on the last iteration but doesn't use the bidi completion. Clean it up by moving the initial bio NULL check and nr_sectors clearing on the last iteration into end_that_request_data() and renaming it to blk_update_request(), which makes blk_end_io() the only user of end_that_request_data(). Collapse end_that_request_data() into blk_end_io(). 2. There are four visible completion variants - blk_end_request(), __blk_end_request(), blk_end_bidi_request() and end_request(). blk_end_request() and blk_end_bidi_request() uses blk_end_request() as the backend but __blk_end_request() and end_request() use separate implementation in __blk_end_request() due to different locking rules. blk_end_bidi_request() is identical to blk_end_io(). Collapse blk_end_io() into blk_end_bidi_request(), separate out request update into internal helper blk_update_bidi_request() and add __blk_end_bidi_request(). Redefine [__]blk_end_request() as thin inline wrappers around [__]blk_end_bidi_request(). 3. As the whole request issue/completion usages are about to be modified and audited, it's a good chance to convert completion functions return bool which better indicates the intended meaning of return values. 4. The function name end_that_request_last() is from the days when it was a public interface and slighly confusing. Give it a proper internal name - blk_finish_request(). 5. Add description explaning that blk_end_bidi_request() can be safely used for uni requests as suggested by Boaz Harrosh. The only visible behavior change is from #1. nr_sectors counts are cleared after the final iteration no matter which function is used to complete the request. I couldn't find any place where the code assumes those nr_sectors counters contain the values for the last segment and this change is good as it makes the API much more consistent as the end result is now same whether a request is completed using [__]blk_end_request() alone or in combination with blk_update_request(). API further cleaned up per Christoph's suggestion. [ Impact: cleanup, rq->*nr_sectors always updated after req completion ] Signed-off-by: Tejun Heo <tj@kernel.org> Reviewed-by: Boaz Harrosh <bharrosh@panasas.com> Cc: Christoph Hellwig <hch@infradead.org>
Diffstat (limited to 'block')
-rw-r--r--block/blk-core.c226
1 files changed, 75 insertions, 151 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 2f277ea0e599..89cc05d9a7a9 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1808,25 +1808,35 @@ void elv_dequeue_request(struct request_queue *q, struct request *rq)
}
/**
- * __end_that_request_first - end I/O on a request
- * @req: the request being processed
+ * blk_update_request - Special helper function for request stacking drivers
+ * @rq: the request being processed
* @error: %0 for success, < %0 for error
- * @nr_bytes: number of bytes to complete
+ * @nr_bytes: number of bytes to complete @rq
*
* Description:
- * Ends I/O on a number of bytes attached to @req, and sets it up
- * for the next range of segments (if any) in the cluster.
+ * Ends I/O on a number of bytes attached to @rq, but doesn't complete
+ * the request structure even if @rq doesn't have leftover.
+ * If @rq has leftover, sets it up for the next range of segments.
+ *
+ * This special helper function is only for request stacking drivers
+ * (e.g. request-based dm) so that they can handle partial completion.
+ * Actual device drivers should use blk_end_request instead.
+ *
+ * Passing the result of blk_rq_bytes() as @nr_bytes guarantees
+ * %false return from this function.
*
* Return:
- * %0 - we are done with this request, call end_that_request_last()
- * %1 - still buffers pending for this request
+ * %false - this request doesn't have any more data
+ * %true - this request has more data
**/
-static int __end_that_request_first(struct request *req, int error,
- int nr_bytes)
+bool blk_update_request(struct request *req, int error, unsigned int nr_bytes)
{
int total_bytes, bio_nbytes, next_idx = 0;
struct bio *bio;
+ if (!req->bio)
+ return false;
+
trace_block_rq_complete(req->q, req);
/*
@@ -1903,8 +1913,16 @@ static int __end_that_request_first(struct request *req, int error,
/*
* completely done
*/
- if (!req->bio)
- return 0;
+ if (!req->bio) {
+ /*
+ * Reset counters so that the request stacking driver
+ * can find how many bytes remain in the request
+ * later.
+ */
+ req->nr_sectors = req->hard_nr_sectors = 0;
+ req->current_nr_sectors = req->hard_cur_sectors = 0;
+ return false;
+ }
/*
* if the request wasn't completed, update state
@@ -1918,29 +1936,31 @@ static int __end_that_request_first(struct request *req, int error,
blk_recalc_rq_sectors(req, total_bytes >> 9);
blk_recalc_rq_segments(req);
- return 1;
+ return true;
}
+EXPORT_SYMBOL_GPL(blk_update_request);
-static int end_that_request_data(struct request *rq, int error,
- unsigned int nr_bytes, unsigned int bidi_bytes)
+static bool blk_update_bidi_request(struct request *rq, int error,
+ unsigned int nr_bytes,
+ unsigned int bidi_bytes)
{
- if (rq->bio) {
- if (__end_that_request_first(rq, error, nr_bytes))
- return 1;
+ if (blk_update_request(rq, error, nr_bytes))
+ return true;
- /* Bidi request must be completed as a whole */
- if (blk_bidi_rq(rq) &&
- __end_that_request_first(rq->next_rq, error, bidi_bytes))
- return 1;
- }
+ /* Bidi request must be completed as a whole */
+ if (unlikely(blk_bidi_rq(rq)) &&
+ blk_update_request(rq->next_rq, error, bidi_bytes))
+ return true;
- return 0;
+ add_disk_randomness(rq->rq_disk);
+
+ return false;
}
/*
* queue lock must be held
*/
-static void end_that_request_last(struct request *req, int error)
+static void blk_finish_request(struct request *req, int error)
{
if (blk_rq_tagged(req))
blk_queue_end_tag(req->q, req);
@@ -1966,161 +1986,65 @@ static void end_that_request_last(struct request *req, int error)
}
/**
- * blk_end_io - Generic end_io function to complete a request.
- * @rq: the request being processed
- * @error: %0 for success, < %0 for error
- * @nr_bytes: number of bytes to complete @rq
- * @bidi_bytes: number of bytes to complete @rq->next_rq
+ * blk_end_bidi_request - Complete a bidi request
+ * @rq: the request to complete
+ * @error: %0 for success, < %0 for error
+ * @nr_bytes: number of bytes to complete @rq
+ * @bidi_bytes: number of bytes to complete @rq->next_rq
*
* Description:
* Ends I/O on a number of bytes attached to @rq and @rq->next_rq.
- * If @rq has leftover, sets it up for the next range of segments.
+ * Drivers that supports bidi can safely call this member for any
+ * type of request, bidi or uni. In the later case @bidi_bytes is
+ * just ignored.
*
* Return:
- * %0 - we are done with this request
- * %1 - this request is not freed yet, it still has pending buffers.
+ * %false - we are done with this request
+ * %true - still buffers pending for this request
**/
-static int blk_end_io(struct request *rq, int error, unsigned int nr_bytes,
- unsigned int bidi_bytes)
+bool blk_end_bidi_request(struct request *rq, int error,
+ unsigned int nr_bytes, unsigned int bidi_bytes)
{
struct request_queue *q = rq->q;
- unsigned long flags = 0UL;
-
- if (end_that_request_data(rq, error, nr_bytes, bidi_bytes))
- return 1;
+ unsigned long flags;
- add_disk_randomness(rq->rq_disk);
+ if (blk_update_bidi_request(rq, error, nr_bytes, bidi_bytes))
+ return true;
spin_lock_irqsave(q->queue_lock, flags);
- end_that_request_last(rq, error);
+ blk_finish_request(rq, error);
spin_unlock_irqrestore(q->queue_lock, flags);
- return 0;
-}
-
-/**
- * blk_end_request - Helper function for drivers to complete the request.
- * @rq: the request being processed
- * @error: %0 for success, < %0 for error
- * @nr_bytes: number of bytes to complete
- *
- * Description:
- * Ends I/O on a number of bytes attached to @rq.
- * If @rq has leftover, sets it up for the next range of segments.
- *
- * Return:
- * %0 - we are done with this request
- * %1 - still buffers pending for this request
- **/
-int blk_end_request(struct request *rq, int error, unsigned int nr_bytes)
-{
- return blk_end_io(rq, error, nr_bytes, 0);
-}
-EXPORT_SYMBOL_GPL(blk_end_request);
-
-/**
- * __blk_end_request - Helper function for drivers to complete the request.
- * @rq: the request being processed
- * @error: %0 for success, < %0 for error
- * @nr_bytes: number of bytes to complete
- *
- * Description:
- * Must be called with queue lock held unlike blk_end_request().
- *
- * Return:
- * %0 - we are done with this request
- * %1 - still buffers pending for this request
- **/
-int __blk_end_request(struct request *rq, int error, unsigned int nr_bytes)
-{
- if (rq->bio && __end_that_request_first(rq, error, nr_bytes))
- return 1;
-
- add_disk_randomness(rq->rq_disk);
-
- end_that_request_last(rq, error);
-
- return 0;
+ return false;
}
-EXPORT_SYMBOL_GPL(__blk_end_request);
+EXPORT_SYMBOL_GPL(blk_end_bidi_request);
/**
- * blk_end_bidi_request - Helper function for drivers to complete bidi request.
- * @rq: the bidi request being processed
+ * __blk_end_bidi_request - Complete a bidi request with queue lock held
+ * @rq: the request to complete
* @error: %0 for success, < %0 for error
* @nr_bytes: number of bytes to complete @rq
* @bidi_bytes: number of bytes to complete @rq->next_rq
*
* Description:
- * Ends I/O on a number of bytes attached to @rq and @rq->next_rq.
+ * Identical to blk_end_bidi_request() except that queue lock is
+ * assumed to be locked on entry and remains so on return.
*
* Return:
- * %0 - we are done with this request
- * %1 - still buffers pending for this request
- **/
-int blk_end_bidi_request(struct request *rq, int error, unsigned int nr_bytes,
- unsigned int bidi_bytes)
-{
- return blk_end_io(rq, error, nr_bytes, bidi_bytes);
-}
-EXPORT_SYMBOL_GPL(blk_end_bidi_request);
-
-/**
- * end_request - end I/O on the current segment of the request
- * @req: 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 I/O completions.
- * Modern drivers typically end I/O 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. Use blk_end_request() or __blk_end_request() to end a request.
+ * %false - we are done with this request
+ * %true - still buffers pending for this request
**/
-void end_request(struct request *req, int uptodate)
+bool __blk_end_bidi_request(struct request *rq, int error,
+ unsigned int nr_bytes, unsigned int bidi_bytes)
{
- int error = 0;
+ if (blk_update_bidi_request(rq, error, nr_bytes, bidi_bytes))
+ return true;
- if (uptodate <= 0)
- error = uptodate ? uptodate : -EIO;
+ blk_finish_request(rq, error);
- __blk_end_request(req, error, req->hard_cur_sectors << 9);
-}
-EXPORT_SYMBOL(end_request);
-
-/**
- * blk_update_request - Special helper function for request stacking drivers
- * @rq: the request being processed
- * @error: %0 for success, < %0 for error
- * @nr_bytes: number of bytes to complete @rq
- *
- * Description:
- * Ends I/O on a number of bytes attached to @rq, but doesn't complete
- * the request structure even if @rq doesn't have leftover.
- * If @rq has leftover, sets it up for the next range of segments.
- *
- * This special helper function is only for request stacking drivers
- * (e.g. request-based dm) so that they can handle partial completion.
- * Actual device drivers should use blk_end_request instead.
- */
-void blk_update_request(struct request *rq, int error, unsigned int nr_bytes)
-{
- if (!end_that_request_data(rq, error, nr_bytes, 0)) {
- /*
- * These members are not updated in end_that_request_data()
- * when all bios are completed.
- * Update them so that the request stacking driver can find
- * how many bytes remain in the request later.
- */
- rq->nr_sectors = rq->hard_nr_sectors = 0;
- rq->current_nr_sectors = rq->hard_cur_sectors = 0;
- }
+ return false;
}
-EXPORT_SYMBOL_GPL(blk_update_request);
+EXPORT_SYMBOL_GPL(__blk_end_bidi_request);
void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
struct bio *bio)