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block: make bdev_ops->rw_page() take a REQ_OP instead of bool

Browse source 
c11f0c0b5b ("block/mm: make bdev_ops->rw_page() take a bool for
read/write") replaced @op with boolean @is_write, which limited the
amount of information going into ->rw_page() and more importantly
page_endio(), which removed the need to expose block internals to mm.

Unfortunately, we want to track discards separately and @is_write
isn't enough information.  This patch updates bdev_ops->rw_page() to
take REQ_OP instead but leaves page_endio() to take bool @is_write.
This allows the block part of operations to have enough information
while not leaking it to mm.

Signed-off-by: Tejun Heo <[email protected]>
Cc: Mike Christie <[email protected]>
Cc: Minchan Kim <[email protected]>
Cc: Dan Williams <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Tejun Heo 2018-07-18 04:47:36 -07:00 • committed by Jens Axboe
commit 3f289dcb4b
7 changed files with 34 additions and 33 deletions
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4
fs/mpage.c
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@ -51,8 +51,8 @@ static void mpage_end_io(struct bio *bio)
bio_for_each_segment_all(bv, bio, i) {
struct page *page = bv->bv_page;
page_endio(page, op_is_write(bio_op(bio)),
blk_status_to_errno(bio->bi_status));
page_endio(page, bio_op(bio),
blk_status_to_errno(bio->bi_status));
}
bio_put(bio);