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Tue, 10 Nov 2020 01:56:03 -0500 X-MC-Unique: JWp5PuSMPiuOTAH7TSzQuw-1 X-Alimail-AntiSpam: AC=PASS; BC=-1|-1; BR=01201311R781e4; CH=green; DM=||false|; DS=||; FP=0|-1|-1|-1|0|-1|-1|-1; HT=e01e04357; MF=jefflexu@linux.alibaba.com; NM=1; PH=DS; RN=4; SR=0; TI=SMTPD_---0UEqxTzN_1604991358 Received: from localhost(mailfrom:jefflexu@linux.alibaba.com fp:SMTPD_---0UEqxTzN_1604991358) by smtp.aliyun-inc.com(127.0.0.1); Tue, 10 Nov 2020 14:55:59 +0800 From: Jeffle Xu To: snitzer@redhat.com Date: Tue, 10 Nov 2020 14:55:58 +0800 Message-Id: <20201110065558.22694-1-jefflexu@linux.alibaba.com> MIME-Version: 1.0 X-Mimecast-Impersonation-Protect: Policy=CLT - Impersonation Protection Definition; Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 2.78 on 10.11.54.6 X-loop: dm-devel@redhat.com X-Mailman-Approved-At: Tue, 10 Nov 2020 02:55:04 -0500 Cc: joseph.qi@linux.alibaba.com, dm-devel@redhat.com, koct9i@gmail.com Subject: [dm-devel] [PATCH] dm: add support for DM_TARGET_NOWAIT for various targets X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dm-devel-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com This is one prep patch for supporting iopoll for dm device. The direct IO routine will set REQ_NOWAIT flag for REQ_HIPRI IO (that is, IO will do iopoll) in bio_set_polled(). Then in the IO submission routine, the ability of handling REQ_NOWAIT of the block device will be checked for REQ_HIPRI IO in submit_bio_checks(). -EOPNOTSUPP will be returned if the block device doesn't support REQ_NOWAIT. DM lacks support for REQ_NOWAIT until commit 6abc49468eea ("dm: add support for REQ_NOWAIT and enable it for linear target"). Since then, dm targets that support REQ_NOWAIT should advertise DM_TARGET_NOWAIT feature. This patch adds support for DM_TARGET_NOWAIT for those dm targets, the .map() algorithm of which just involves sector recalculation. Signed-off-by: Jeffle Xu --- Hi Mike, I could split these boilerplate code that each dm target have one seperate patch if you think that would be better. --- drivers/md/dm-stripe.c | 2 +- drivers/md/dm-switch.c | 1 + drivers/md/dm-unstripe.c | 1 + drivers/md/dm-zero.c | 1 + 4 files changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c index 151d022b032d..df359d33cda8 100644 --- a/drivers/md/dm-stripe.c +++ b/drivers/md/dm-stripe.c @@ -496,7 +496,7 @@ static void stripe_io_hints(struct dm_target *ti, static struct target_type stripe_target = { .name = "striped", .version = {1, 6, 0}, - .features = DM_TARGET_PASSES_INTEGRITY, + .features = DM_TARGET_PASSES_INTEGRITY | DM_TARGET_NOWAIT, .module = THIS_MODULE, .ctr = stripe_ctr, .dtr = stripe_dtr, diff --git a/drivers/md/dm-switch.c b/drivers/md/dm-switch.c index bff4c7fa1cd2..262e2b0fd975 100644 --- a/drivers/md/dm-switch.c +++ b/drivers/md/dm-switch.c @@ -550,6 +550,7 @@ static int switch_iterate_devices(struct dm_target *ti, static struct target_type switch_target = { .name = "switch", .version = {1, 1, 0}, + .features = DM_TARGET_NOWAIT, .module = THIS_MODULE, .ctr = switch_ctr, .dtr = switch_dtr, diff --git a/drivers/md/dm-unstripe.c b/drivers/md/dm-unstripe.c index e673dacf6418..7357c1bd5863 100644 --- a/drivers/md/dm-unstripe.c +++ b/drivers/md/dm-unstripe.c @@ -178,6 +178,7 @@ static void unstripe_io_hints(struct dm_target *ti, static struct target_type unstripe_target = { .name = "unstriped", .version = {1, 1, 0}, + .features = DM_TARGET_NOWAIT, .module = THIS_MODULE, .ctr = unstripe_ctr, .dtr = unstripe_dtr, diff --git a/drivers/md/dm-zero.c b/drivers/md/dm-zero.c index b65ca8dcfbdc..faa1dbffc8b4 100644 --- a/drivers/md/dm-zero.c +++ b/drivers/md/dm-zero.c @@ -59,6 +59,7 @@ static int zero_map(struct dm_target *ti, struct bio *bio) static struct target_type zero_target = { .name = "zero", .version = {1, 1, 0}, + .features = DM_TARGET_NOWAIT, .module = THIS_MODULE, .ctr = zero_ctr, .map = zero_map,