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[83.162.234.235]) by smtp.gmail.com with ESMTPSA id d133sm8887008wmc.27.2020.04.29.07.03.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 29 Apr 2020 07:03:46 -0700 (PDT) From: Martijn Coenen To: axboe@kernel.dk, hch@lst.de, ming.lei@redhat.com Cc: narayan@google.com, zezeozue@google.com, kernel-team@android.com, maco@google.com, bvanassche@acm.org, Chaitanya.Kulkarni@wdc.com, jaegeuk@kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Martijn Coenen Subject: [PATCH v4 02/10] loop: Factor out setting loop device size Date: Wed, 29 Apr 2020 16:03:33 +0200 Message-Id: <20200429140341.13294-3-maco@android.com> X-Mailer: git-send-email 2.26.2.303.gf8c07b1a785-goog In-Reply-To: <20200429140341.13294-1-maco@android.com> References: <20200429140341.13294-1-maco@android.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org This code is used repeatedly. Signed-off-by: Martijn Coenen --- drivers/block/loop.c | 31 ++++++++++++++++++++++--------- 1 file changed, 22 insertions(+), 9 deletions(-) diff --git a/drivers/block/loop.c b/drivers/block/loop.c index 396b8bd4d75c..6643e48ad71c 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -241,12 +241,29 @@ loop_validate_size(loff_t size) return 0; } +/** + * loop_set_size() - sets device size and notifies userspace + * @lo: struct loop_device to set the size for + * @size: new size of the loop device + * + * Callers must validate that the size passed into this function fits into + * a sector_t, eg using loop_validate_size() + */ +static void loop_set_size(struct loop_device *lo, loff_t size) +{ + struct block_device *bdev = lo->lo_device; + + set_capacity(lo->lo_disk, size); + bd_set_size(bdev, size << SECTOR_SHIFT); + /* let user-space know about the new size */ + kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE); +} + static int figure_loop_size(struct loop_device *lo, loff_t offset, loff_t sizelimit) { int err; loff_t size = get_size(offset, sizelimit, lo->lo_backing_file); - struct block_device *bdev = lo->lo_device; err = loop_validate_size(size); if (err) @@ -256,10 +273,9 @@ figure_loop_size(struct loop_device *lo, loff_t offset, loff_t sizelimit) lo->lo_offset = offset; if (lo->lo_sizelimit != sizelimit) lo->lo_sizelimit = sizelimit; - set_capacity(lo->lo_disk, x); - bd_set_size(bdev, (loff_t)get_capacity(bdev->bd_disk) << 9); - /* let user-space know about the new size */ - kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE); + + loop_set_size(lo, size); + return 0; } @@ -1055,11 +1071,8 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode, loop_update_rotational(lo); loop_update_dio(lo); - set_capacity(lo->lo_disk, size); - bd_set_size(bdev, size << 9); loop_sysfs_init(lo); - /* let user-space know about the new size */ - kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE); + loop_set_size(lo, size); set_blocksize(bdev, S_ISBLK(inode->i_mode) ? block_size(inode->i_bdev) : PAGE_SIZE); -- 2.26.2.303.gf8c07b1a785-goog