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block, drivers, cgroup: use op_is_write helper instead of checking for REQ_WRITE 

We currently set REQ_WRITE/WRITE for all non READ IOs
like discard, flush, writesame, etc. In the next patches where we
no longer set up the op as a bitmap, we will not be able to
detect a operation direction like writesame by testing if REQ_WRITE is
set.

This patch converts the drivers and cgroup to use the
op_is_write helper. This should just cover the simple
cases. I did dm, md and bcache in their own patches
because they were more involved.

Signed-off-by: Mike Christie <mchristi@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Mike Christie 2016-06-05 14:31:45 -05:00 committed by Jens Axboe
parent dfec8a14fc
commit a8ebb056a8
7 changed files with 11 additions and 11 deletions
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4
block/blk-core.c
View File

@ -2115,7 +2115,7 @@ blk_qc_t submit_bio(struct bio *bio)
else
count = bio_sectors(bio);
if (bio->bi_rw & WRITE) {
if (op_is_write(bio_op(bio))) {
count_vm_events(PGPGOUT, count);
} else {
task_io_account_read(bio->bi_iter.bi_size);
@ -2126,7 +2126,7 @@ blk_qc_t submit_bio(struct bio *bio)
char b[BDEVNAME_SIZE];
printk(KERN_DEBUG "%s(%d): %s block %Lu on %s (%u sectors)\n",
current->comm, task_pid_nr(current),
(bio->bi_rw & WRITE) ? "WRITE" : "READ",
op_is_write(bio_op(bio)) ? "WRITE" : "READ",
(unsigned long long)bio->bi_iter.bi_sector,
bdevname(bio->bi_bdev, b),
count);

2
block/blk-merge.c
View File

@ -439,7 +439,7 @@ int blk_rq_map_sg(struct request_queue *q, struct request *rq,
}
if (q->dma_drain_size && q->dma_drain_needed(rq)) {
if (rq->cmd_flags & REQ_WRITE)
if (op_is_write(req_op(rq)))
memset(q->dma_drain_buffer, 0, q->dma_drain_size);
sg_unmark_end(sg);

2
drivers/ata/libata-scsi.c
View File

@ -1190,7 +1190,7 @@ static int atapi_drain_needed(struct request *rq)
if (likely(rq->cmd_type != REQ_TYPE_BLOCK_PC))
return 0;
if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_WRITE))
if (!blk_rq_bytes(rq) || op_is_write(req_op(rq)))
return 0;
return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC;

6
drivers/block/loop.c
View File

@ -447,7 +447,7 @@ static int lo_req_flush(struct loop_device *lo, struct request *rq)
static inline void handle_partial_read(struct loop_cmd *cmd, long bytes)
{
if (bytes < 0 || (cmd->rq->cmd_flags & REQ_WRITE))
if (bytes < 0 || op_is_write(req_op(cmd->rq)))
return;
if (unlikely(bytes < blk_rq_bytes(cmd->rq))) {
@ -541,7 +541,7 @@ static int do_req_filebacked(struct loop_device *lo, struct request *rq)
pos = ((loff_t) blk_rq_pos(rq) << 9) + lo->lo_offset;
if (rq->cmd_flags & REQ_WRITE) {
if (op_is_write(req_op(rq))) {
if (rq->cmd_flags & REQ_FLUSH)
ret = lo_req_flush(lo, rq);
else if (rq->cmd_flags & REQ_DISCARD)
@ -1672,7 +1672,7 @@ static int loop_queue_rq(struct blk_mq_hw_ctx *hctx,
static void loop_handle_cmd(struct loop_cmd *cmd)
{
const bool write = cmd->rq->cmd_flags & REQ_WRITE;
const bool write = op_is_write(req_op(cmd->rq));
struct loop_device *lo = cmd->rq->q->queuedata;
int ret = 0;

2
drivers/block/umem.c
View File

@ -462,7 +462,7 @@ static void process_page(unsigned long data)
le32_to_cpu(desc->local_addr)>>9,
le32_to_cpu(desc->transfer_size));
dump_dmastat(card, control);
} else if ((bio->bi_rw & REQ_WRITE) &&
} else if (op_is_write(bio_op(bio)) &&
le32_to_cpu(desc->local_addr) >> 9 ==
card->init_size) {
card->init_size += le32_to_cpu(desc->transfer_size) >> 9;

4
drivers/scsi/osd/osd_initiator.c
View File

@ -824,7 +824,7 @@ void osd_req_write(struct osd_request *or,
{
_osd_req_encode_common(or, OSD_ACT_WRITE, obj, offset, len);
WARN_ON(or->out.bio || or->out.total_bytes);
WARN_ON(0 == (bio->bi_rw & REQ_WRITE));
WARN_ON(!op_is_write(bio_op(bio)));
or->out.bio = bio;
or->out.total_bytes = len;
}
@ -875,7 +875,7 @@ void osd_req_read(struct osd_request *or,
{
_osd_req_encode_common(or, OSD_ACT_READ, obj, offset, len);
WARN_ON(or->in.bio || or->in.total_bytes);
WARN_ON(bio->bi_rw & REQ_WRITE);
WARN_ON(op_is_write(bio_op(bio)));
or->in.bio = bio;
or->in.total_bytes = len;
}

2
include/linux/blk-cgroup.h
View File

@ -601,7 +601,7 @@ static inline void blkg_rwstat_add(struct blkg_rwstat *rwstat,
{
struct percpu_counter *cnt;
if (rw & REQ_WRITE)
if (op_is_write(rw))
cnt = &rwstat->cpu_cnt[BLKG_RWSTAT_WRITE];
else
cnt = &rwstat->cpu_cnt[BLKG_RWSTAT_READ];