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[141.239.144.21]) by smtp.gmail.com with ESMTPSA id b4-20020a056a000a8400b006dde023cce8sm7211721pfl.57.2024.01.30.01.13.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 30 Jan 2024 01:13:16 -0800 (PST) Sender: Tejun Heo From: Tejun Heo To: torvalds@linux-foundation.org, mpatocka@redhat.com Cc: linux-kernel@vger.kernel.org, dm-devel@lists.linux.dev, msnitzer@redhat.com, ignat@cloudflare.com, damien.lemoal@wdc.com, bob.liu@oracle.com, houtao1@huawei.com, peterz@infradead.org, mingo@kernel.org, netdev@vger.kernel.org, allen.lkml@gmail.com, kernel-team@meta.com, Tejun Heo , Alasdair Kergon , Mike Snitzer Subject: [PATCH 8/8] dm-verity: Convert from tasklet to BH workqueue Date: Mon, 29 Jan 2024 23:11:55 -1000 Message-ID: <20240130091300.2968534-9-tj@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240130091300.2968534-1-tj@kernel.org> References: <20240130091300.2968534-1-tj@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1789506736591745889 X-GMAIL-MSGID: 1789506736591745889 The only generic interface to execute asynchronously in the BH context is tasklet; however, it's marked deprecated and has some design flaws. To replace tasklets, BH workqueue support was recently added. A BH workqueue behaves similarly to regular workqueues except that the queued work items are executed in the BH context. This patch converts dm-verity from tasklet to BH workqueue. This is a minimal conversion which doesn't rename the related names including the "try_verify_in_tasklet" option. If this patch is applied, a follow-up patch would be necessary. I couldn't decide whether the option name would need to be updated too. Only compile tested. I don't know how to verity. Signed-off-by: Tejun Heo Cc: Alasdair Kergon Cc: Mike Snitzer Cc: Mikulas Patocka Cc: dm-devel@lists.linux.dev --- drivers/md/dm-verity-target.c | 8 ++++---- drivers/md/dm-verity.h | 2 +- 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/md/dm-verity-target.c b/drivers/md/dm-verity-target.c index 14e58ae70521..911261de2d08 100644 --- a/drivers/md/dm-verity-target.c +++ b/drivers/md/dm-verity-target.c @@ -645,9 +645,9 @@ static void verity_work(struct work_struct *w) verity_finish_io(io, errno_to_blk_status(verity_verify_io(io))); } -static void verity_tasklet(unsigned long data) +static void verity_bh_work(struct work_struct *w) { - struct dm_verity_io *io = (struct dm_verity_io *)data; + struct dm_verity_io *io = container_of(w, struct dm_verity_io, bh_work); int err; io->in_tasklet = true; @@ -675,8 +675,8 @@ static void verity_end_io(struct bio *bio) } if (static_branch_unlikely(&use_tasklet_enabled) && io->v->use_tasklet) { - tasklet_init(&io->tasklet, verity_tasklet, (unsigned long)io); - tasklet_schedule(&io->tasklet); + INIT_WORK(&io->bh_work, verity_bh_work); + queue_work(system_bh_wq, &io->bh_work); } else { INIT_WORK(&io->work, verity_work); queue_work(io->v->verify_wq, &io->work); diff --git a/drivers/md/dm-verity.h b/drivers/md/dm-verity.h index f9d522c870e6..7c16f834f31a 100644 --- a/drivers/md/dm-verity.h +++ b/drivers/md/dm-verity.h @@ -83,7 +83,7 @@ struct dm_verity_io { struct bvec_iter iter; struct work_struct work; - struct tasklet_struct tasklet; + struct work_struct bh_work; /* * Three variably-size fields follow this struct: