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[157.230.128.187]) by smtp.gmail.com with ESMTPSA id v7sm6569138pfn.147.2020.06.19.13.47.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 19 Jun 2020 13:47:32 -0700 (PDT) Received: by 42.do-not-panic.com (Postfix, from userid 1000) id 4556A41C23; Fri, 19 Jun 2020 20:47:32 +0000 (UTC) From: Luis Chamberlain To: axboe@kernel.dk, viro@zeniv.linux.org.uk, bvanassche@acm.org, gregkh@linuxfoundation.org, rostedt@goodmis.org, mingo@redhat.com, jack@suse.cz, ming.lei@redhat.com, nstange@suse.de, akpm@linux-foundation.org Cc: mhocko@suse.com, yukuai3@huawei.com, martin.petersen@oracle.com, jejb@linux.ibm.com, linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Luis Chamberlain , Christoph Hellwig Subject: [PATCH v7 2/8] block: clarify context for refcount increment helpers Date: Fri, 19 Jun 2020 20:47:24 +0000 Message-Id: <20200619204730.26124-3-mcgrof@kernel.org> X-Mailer: git-send-email 2.23.0.rc1 In-Reply-To: <20200619204730.26124-1-mcgrof@kernel.org> References: <20200619204730.26124-1-mcgrof@kernel.org> MIME-Version: 1.0 X-Rspamd-Queue-Id: 7EA30180D0184 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam04 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Let us clarify the context under which the helpers to increment the refcount for the gendisk and request_queue can be called under. We make this explicit on the places where we may sleep with might_sleep(). We don't address the decrement context yet, as that needs some extra work and fixes, but will be addressed in the next patch. Reviewed-by: Christoph Hellwig Reviewed-by: Bart Van Assche Signed-off-by: Luis Chamberlain --- block/blk-core.c | 2 ++ block/genhd.c | 6 ++++++ 2 files changed, 8 insertions(+) diff --git a/block/blk-core.c b/block/blk-core.c index a0760aac110a..14c09daf55f3 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -610,6 +610,8 @@ EXPORT_SYMBOL(blk_alloc_queue); * @q: the request_queue structure to increment the refcount for * * Increment the refcount of the request_queue kobject. + * + * Context: Any context. */ bool blk_get_queue(struct request_queue *q) { diff --git a/block/genhd.c b/block/genhd.c index f741613d731f..1be86b1f43ec 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -985,11 +985,15 @@ static ssize_t disk_badblocks_store(struct device *dev, * * This function gets the structure containing partitioning * information for the given device @devt. + * + * Context: can sleep */ struct gendisk *get_gendisk(dev_t devt, int *partno) { struct gendisk *disk = NULL; + might_sleep(); + if (MAJOR(devt) != BLOCK_EXT_MAJOR) { struct kobject *kobj; @@ -1764,6 +1768,8 @@ EXPORT_SYMBOL(__alloc_disk_node); * * This increments the refcount for the struct gendisk, and the gendisk's * fops module owner. + * + * Context: Any context. */ struct kobject *get_disk_and_module(struct gendisk *disk) {