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block: reorder request completion functions

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Reorder request completion functions such that

* All request completion functions are located together.

* Functions which are used by only one caller is put right above the
  caller.

* end_request() is put after other completion functions but before
  blk_update_request().

This change is for completion function cleanup which will follow.

[ Impact: cleanup, code reorganization ]

Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo 2009-04-23 11:05:18 +09:00 committed by Jens Axboe
parent 2eef33e439
commit 5efccd17ce
2 changed files with 80 additions and 80 deletions
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144
block/blk-core.c
View File

@ -1683,6 +1683,35 @@ static void blk_account_io_done(struct request *req)
}
}
/**
* blk_rq_bytes - Returns bytes left to complete in the entire request
* @rq: the request being processed
**/
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
* @rq: the request being processed
**/
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_that_request_first - end I/O on a request
* @req: the request being processed
@ -1797,6 +1826,22 @@ static int __end_that_request_first(struct request *req, int error,
return 1;
}
static int end_that_request_data(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;
/* 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;
}
return 0;
}
/*
* queue lock must be held
*/
@ -1825,78 +1870,6 @@ static void end_that_request_last(struct request *req, int error)
}
}
/**
* blk_rq_bytes - Returns bytes left to complete in the entire request
* @rq: the request being processed
**/
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
* @rq: the request being processed
**/
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_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.
**/
void end_request(struct request *req, int uptodate)
{
int error = 0;
if (uptodate <= 0)
error = uptodate ? uptodate : -EIO;
__blk_end_request(req, error, req->hard_cur_sectors << 9);
}
EXPORT_SYMBOL(end_request);
static int end_that_request_data(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;
/* 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;
}
return 0;
}
/**
* blk_end_io - Generic end_io function to complete a request.
* @rq: the request being processed
@ -2006,6 +1979,33 @@ int blk_end_bidi_request(struct request *rq, int error, unsigned int nr_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.
**/
void end_request(struct request *req, int uptodate)
{
int error = 0;
if (uptodate <= 0)
error = uptodate ? uptodate : -EIO;
__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

16
include/linux/blkdev.h
View File

@ -831,6 +831,14 @@ static inline void blk_run_address_space(struct address_space *mapping)
extern void blkdev_dequeue_request(struct request *req);
/*
* 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);
/*
* blk_end_request() and friends.
* __blk_end_request() and end_request() must be called with
@ -857,14 +865,6 @@ extern void blk_abort_queue(struct request_queue *);
extern void blk_update_request(struct request *rq, int error,
unsigned int nr_bytes);
/*
* 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);
/*
* Access functions for manipulating queue properties
*/