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Wed, 10 Apr 2024 11:59:05 -0700 (PDT) X-Google-Smtp-Source: AGHT+IH1rZzHlFdlKErUaVzaIIBoz+uophffHDufiBosrVM2ScG6c79A0tsfU5q3lB5GUj4EtqyQxA== X-Received: by 2002:a05:6214:4111:b0:69b:1efb:9d42 with SMTP id kc17-20020a056214411100b0069b1efb9d42mr3445922qvb.6.1712775544953; Wed, 10 Apr 2024 11:59:04 -0700 (PDT) Received: from [192.168.1.165] ([70.22.187.239]) by smtp.gmail.com with ESMTPSA id p20-20020a05621415d400b00698d06df322sm5418657qvz.122.2024.04.10.11.59.04 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 10 Apr 2024 11:59:04 -0700 (PDT) Message-ID: <1e344d3b-1e30-6638-83c3-f743546374ec@redhat.com> Date: Wed, 10 Apr 2024 14:59:03 -0400 Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.12.0 Subject: Re: [PATCH vfs.all 19/26] dm-vdo: convert to use bdev_file Content-Language: en-US To: Al Viro Cc: Yu Kuai , jack@suse.cz, hch@lst.de, brauner@kernel.org, axboe@kernel.dk, linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, yi.zhang@huawei.com, yangerkun@huawei.com, yukuai3@huawei.com, dm-devel@lists.linux.dev References: <20240406090930.2252838-1-yukuai1@huaweicloud.com> <20240406090930.2252838-20-yukuai1@huaweicloud.com> <20240410174022.GF2118490@ZenIV> From: Matthew Sakai In-Reply-To: <20240410174022.GF2118490@ZenIV> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 4/10/24 13:40, Al Viro wrote: > On Wed, Apr 10, 2024 at 01:26:47PM -0400, Matthew Sakai wrote: > >>> 'dm_dev->bdev_file', it's ok to get inode from the file. > > It can be done much easier, though - > > [PATCH] dm-vdo: use bdev_nr_bytes(bdev) instead of i_size_read(bdev->bd_inode) > > going to be faster, actually - shift is cheaper than dereference... This does look simpler. And doing this means there's no reason to switch dm-vdo from using struct block_device * to using struct file *, so the rest of the original patch is unnecessary. Reviewed-by: Matthew Sakai > Signed-off-by: Al Viro > --- > diff --git a/drivers/md/dm-vdo/dm-vdo-target.c b/drivers/md/dm-vdo/dm-vdo-target.c > index 5a4b0a927f56..b423bec6458b 100644 > --- a/drivers/md/dm-vdo/dm-vdo-target.c > +++ b/drivers/md/dm-vdo/dm-vdo-target.c > @@ -878,7 +878,7 @@ static int parse_device_config(int argc, char **argv, struct dm_target *ti, > } > > if (config->version == 0) { > - u64 device_size = i_size_read(config->owned_device->bdev->bd_inode); > + u64 device_size = bdev_nr_bytes(config->owned_device->bdev); > > config->physical_blocks = device_size / VDO_BLOCK_SIZE; > } > @@ -1011,7 +1011,7 @@ static void vdo_status(struct dm_target *ti, status_type_t status_type, > > static block_count_t __must_check get_underlying_device_block_count(const struct vdo *vdo) > { > - return i_size_read(vdo_get_backing_device(vdo)->bd_inode) / VDO_BLOCK_SIZE; > + return bdev_nr_bytes(vdo_get_backing_device(vdo)) / VDO_BLOCK_SIZE; > } > > static int __must_check process_vdo_message_locked(struct vdo *vdo, unsigned int argc, > diff --git a/drivers/md/dm-vdo/indexer/io-factory.c b/drivers/md/dm-vdo/indexer/io-factory.c > index 515765d35794..1bee9d63dc0a 100644 > --- a/drivers/md/dm-vdo/indexer/io-factory.c > +++ b/drivers/md/dm-vdo/indexer/io-factory.c > @@ -90,7 +90,7 @@ void uds_put_io_factory(struct io_factory *factory) > > size_t uds_get_writable_size(struct io_factory *factory) > { > - return i_size_read(factory->bdev->bd_inode); > + return bdev_nr_bytes(factory->bdev); > } > > /* Create a struct dm_bufio_client for an index region starting at offset. */ >