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Don't decrement bi_size in bio_endio

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The only caller of bio_endio that does not pass the full bi_size
is end_that_request_first.  Also, no ->bi_end_io method is really
interested in bi_size being decremented.

So move the decrement and related code into ll_rw_blk and merge it
with order_bio_endio to form req_bio_endio which does endio functionality
specific to request completion.

As some ->bi_end_io methods do check bi_size of 0, we set it thus for
now, but that will go in the next patch.

Signed-off-by: Neil Brown <neilb@suse.de>

### Diffstat output
 ./block/ll_rw_blk.c |   42 +++++++++++++++++++++++++++---------------
 ./fs/bio.c          |   23 +++++++++++------------
 2 files changed, 38 insertions(+), 27 deletions(-)

diff .prev/block/ll_rw_blk.c ./block/ll_rw_blk.c
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
NeilBrown 2007-09-27 12:46:13 +02:00 committed by Jens Axboe
parent 9cc54d40b8
commit 5bb23a688b
2 changed files with 38 additions and 27 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

42
block/ll_rw_blk.c
View file

@ -527,22 +527,36 @@ int blk_do_ordered(struct request_queue *q, struct request **rqp)
return 1;
}
static int ordered_bio_endio(struct request *rq, struct bio *bio,
unsigned int nbytes, int error)
static void req_bio_endio(struct request *rq, struct bio *bio,
unsigned int nbytes, int error)
{
struct request_queue *q = rq->q;
if (&q->bar_rq != rq)
return 0;
if (&q->bar_rq != rq) {
if (error)
clear_bit(BIO_UPTODATE, &bio->bi_flags);
else if (!test_bit(BIO_UPTODATE, &bio->bi_flags))
error = -EIO;
/*
* Okay, this is the barrier request in progress, just
* record the error;
*/
if (error && !q->orderr)
q->orderr = error;
if (unlikely(nbytes > bio->bi_size)) {
printk("%s: want %u bytes done, only %u left\n",
__FUNCTION__, nbytes, bio->bi_size);
nbytes = bio->bi_size;
}
return 1;
bio->bi_size -= nbytes;
bio->bi_sector += (nbytes >> 9);
if (bio->bi_size == 0)
bio_endio(bio, bio->bi_size, error);
} else {
/*
* Okay, this is the barrier request in progress, just
* record the error;
*/
if (error && !q->orderr)
q->orderr = error;
}
}
/**
@ -3388,8 +3402,7 @@ static int __end_that_request_first(struct request *req, int uptodate,
if (nr_bytes >= bio->bi_size) {
req->bio = bio->bi_next;
nbytes = bio->bi_size;
if (!ordered_bio_endio(req, bio, nbytes, error))
bio_endio(bio, nbytes, error);
req_bio_endio(req, bio, nbytes, error);
next_idx = 0;
bio_nbytes = 0;
} else {
@ -3444,8 +3457,7 @@ static int __end_that_request_first(struct request *req, int uptodate,
* if the request wasn't completed, update state
*/
if (bio_nbytes) {
if (!ordered_bio_endio(req, bio, bio_nbytes, error))
bio_endio(bio, bio_nbytes, error);
req_bio_endio(req, bio, bio_nbytes, error);
bio->bi_idx += next_idx;
bio_iovec(bio)->bv_offset += nr_bytes;
bio_iovec(bio)->bv_len -= nr_bytes;

23
fs/bio.c
View file

@ -1006,13 +1006,14 @@ void bio_check_pages_dirty(struct bio *bio)
* @error: error, if any
*
* Description:
* bio_endio() will end I/O on @bytes_done number of bytes. This may be
* just a partial part of the bio, or it may be the whole bio. bio_endio()
* is the preferred way to end I/O on a bio, it takes care of decrementing
* bi_size and clearing BIO_UPTODATE on error. @error is 0 on success, and
* and one of the established -Exxxx (-EIO, for instance) error values in
* case something went wrong. Noone should call bi_end_io() directly on
* a bio unless they own it and thus know that it has an end_io function.
* bio_endio() will end I/O on @bytes_done number of bytes. This
* must always be the whole (remaining) bio. bio_endio() is the
* preferred way to end I/O on a bio, it takes care of clearing
* BIO_UPTODATE on error. @error is 0 on success, and and one of the
* established -Exxxx (-EIO, for instance) error values in case
* something went wrong. Noone should call bi_end_io() directly on a
* bio unless they own it and thus know that it has an end_io
* function.
**/
void bio_endio(struct bio *bio, unsigned int bytes_done, int error)
{
@ -1021,16 +1022,14 @@ void bio_endio(struct bio *bio, unsigned int bytes_done, int error)
else if (!test_bit(BIO_UPTODATE, &bio->bi_flags))
error = -EIO;
if (unlikely(bytes_done > bio->bi_size)) {
if (unlikely(bytes_done != bio->bi_size)) {
printk("%s: want %u bytes done, only %u left\n", __FUNCTION__,
bytes_done, bio->bi_size);
bytes_done = bio->bi_size;
}
bio->bi_size -= bytes_done;
bio->bi_sector += (bytes_done >> 9);
if (bio->bi_size && bio->bi_end_io)
bio->bi_size = 0; /* expected by some callees - will be removed */
if (bio->bi_end_io)
bio->bi_end_io(bio, bytes_done, error);
}