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dm kcopyd: avoid useless atomic operations 

The functions set_bit and clear_bit are atomic. We don't need
atomicity when making flags for dm-kcopyd. So, change them to direct
manipulation of the flags.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mikulas Patocka 2021-05-26 10:16:01 -04:00 committed by Mike Snitzer
parent 6b06dd5a97
commit db2351eb22
3 changed files with 12 additions and 12 deletions
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20
drivers/md/dm-kcopyd.c
View File

@ -341,7 +341,7 @@ static void client_free_pages(struct dm_kcopyd_client *kc)
struct kcopyd_job {
struct dm_kcopyd_client *kc;
struct list_head list;
unsigned long flags;
unsigned flags;
/*
* Error state of the job.
@ -418,7 +418,7 @@ static struct kcopyd_job *pop_io_job(struct list_head *jobs,
* constraint and sequential writes that are at the right position.
*/
list_for_each_entry(job, jobs, list) {
if (job->rw == READ || !test_bit(DM_KCOPYD_WRITE_SEQ, &job->flags)) {
if (job->rw == READ || !(job->flags & BIT(DM_KCOPYD_WRITE_SEQ))) {
list_del(&job->list);
return job;
}
@ -525,7 +525,7 @@ static void complete_io(unsigned long error, void *context)
else
job->read_err = 1;
if (!test_bit(DM_KCOPYD_IGNORE_ERROR, &job->flags)) {
if (!(job->flags & BIT(DM_KCOPYD_IGNORE_ERROR))) {
push(&kc->complete_jobs, job);
wake(kc);
return;
@ -565,7 +565,7 @@ static int run_io_job(struct kcopyd_job *job)
* If we need to write sequentially and some reads or writes failed,
* no point in continuing.
*/
if (test_bit(DM_KCOPYD_WRITE_SEQ, &job->flags) &&
if (job->flags & BIT(DM_KCOPYD_WRITE_SEQ) &&
job->master_job->write_err) {
job->write_err = job->master_job->write_err;
return -EIO;
@ -709,7 +709,7 @@ static void segment_complete(int read_err, unsigned long write_err,
* Only dispatch more work if there hasn't been an error.
*/
if ((!job->read_err && !job->write_err) ||
test_bit(DM_KCOPYD_IGNORE_ERROR, &job->flags)) {
job->flags & BIT(DM_KCOPYD_IGNORE_ERROR)) {
/* get the next chunk of work */
progress = job->progress;
count = job->source.count - progress;
@ -801,10 +801,10 @@ void dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from,
* we need to write sequentially. If one of the destination is a
* host-aware device, then leave it to the caller to choose what to do.
*/
if (!test_bit(DM_KCOPYD_WRITE_SEQ, &job->flags)) {
if (!(job->flags & BIT(DM_KCOPYD_WRITE_SEQ))) {
for (i = 0; i < job->num_dests; i++) {
if (bdev_zoned_model(dests[i].bdev) == BLK_ZONED_HM) {
set_bit(DM_KCOPYD_WRITE_SEQ, &job->flags);
job->flags |= BIT(DM_KCOPYD_WRITE_SEQ);
break;
}
}
@ -813,9 +813,9 @@ void dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from,
/*
* If we need to write sequentially, errors cannot be ignored.
*/
if (test_bit(DM_KCOPYD_WRITE_SEQ, &job->flags) &&
test_bit(DM_KCOPYD_IGNORE_ERROR, &job->flags))
clear_bit(DM_KCOPYD_IGNORE_ERROR, &job->flags);
if (job->flags & BIT(DM_KCOPYD_WRITE_SEQ) &&
job->flags & BIT(DM_KCOPYD_IGNORE_ERROR))
job->flags &= ~BIT(DM_KCOPYD_IGNORE_ERROR);
if (from) {
job->source = *from;

2
drivers/md/dm-raid1.c
View File

@ -364,7 +364,7 @@ static void recover(struct mirror_set *ms, struct dm_region *reg)
/* hand to kcopyd */
if (!errors_handled(ms))
set_bit(DM_KCOPYD_IGNORE_ERROR, &flags);
flags |= BIT(DM_KCOPYD_IGNORE_ERROR);
dm_kcopyd_copy(ms->kcopyd_client, &from, ms->nr_mirrors - 1, to,
flags, recovery_complete, reg);

2
drivers/md/dm-zoned-reclaim.c
View File

@ -134,7 +134,7 @@ static int dmz_reclaim_copy(struct dmz_reclaim *zrc,
dst_zone_block = dmz_start_block(zmd, dst_zone);
if (dmz_is_seq(dst_zone))
set_bit(DM_KCOPYD_WRITE_SEQ, &flags);
flags |= BIT(DM_KCOPYD_WRITE_SEQ);
while (block < end_block) {
if (src_zone->dev->flags & DMZ_BDEV_DYING)