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Thu, 30 Nov 2023 13:53:37 +0000 (GMT) From: Ojaswin Mujoo To: linux-ext4@vger.kernel.org, "Theodore Ts'o" Cc: Ritesh Harjani , linux-kernel@vger.kernel.org, "Darrick J . Wong" , linux-block@vger.kernel.org, linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, John Garry , dchinner@redhat.com Subject: [RFC 5/7] block: export blkdev_atomic_write_valid() and refactor api Date: Thu, 30 Nov 2023 19:23:14 +0530 Message-Id: X-Mailer: git-send-email 2.39.3 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-ext4@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: ZugCvRCajbO69dPqhlk8SBBZ4fODI8KN X-Proofpoint-ORIG-GUID: c1vCyZy5Tdbw7RUuXr_sq8Rtv4ONgRya X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.997,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-11-30_12,2023-11-30_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 bulkscore=0 mlxlogscore=839 adultscore=0 lowpriorityscore=0 impostorscore=0 suspectscore=0 phishscore=0 malwarescore=0 spamscore=0 priorityscore=1501 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311060000 definitions=main-2311300102 Export the blkdev_atomic_write_valid() function so that other filesystems can call it as a part of validating the atomic write operation. Further, refactor the api to accept a len argument instead of iov_iter to make it easier to call from other places. Signed-off-by: Ojaswin Mujoo --- block/fops.c | 18 ++++++++++-------- include/linux/blkdev.h | 2 ++ 2 files changed, 12 insertions(+), 8 deletions(-) diff --git a/block/fops.c b/block/fops.c index 516669ad69e5..5dae95c49720 100644 --- a/block/fops.c +++ b/block/fops.c @@ -41,8 +41,7 @@ static bool blkdev_dio_unaligned(struct block_device *bdev, loff_t pos, !bdev_iter_is_aligned(bdev, iter); } -static bool blkdev_atomic_write_valid(struct block_device *bdev, loff_t pos, - struct iov_iter *iter) +bool blkdev_atomic_write_valid(struct block_device *bdev, loff_t pos, size_t len) { unsigned int atomic_write_unit_min_bytes = queue_atomic_write_unit_min_bytes(bdev_get_queue(bdev)); @@ -53,16 +52,17 @@ static bool blkdev_atomic_write_valid(struct block_device *bdev, loff_t pos, return false; if (pos % atomic_write_unit_min_bytes) return false; - if (iov_iter_count(iter) % atomic_write_unit_min_bytes) + if (len % atomic_write_unit_min_bytes) return false; - if (!is_power_of_2(iov_iter_count(iter))) + if (!is_power_of_2(len)) return false; - if (iov_iter_count(iter) > atomic_write_unit_max_bytes) + if (len > atomic_write_unit_max_bytes) return false; - if (pos % iov_iter_count(iter)) + if (pos % len) return false; return true; } +EXPORT_SYMBOL_GPL(blkdev_atomic_write_valid); #define DIO_INLINE_BIO_VECS 4 @@ -81,7 +81,8 @@ static ssize_t __blkdev_direct_IO_simple(struct kiocb *iocb, if (blkdev_dio_unaligned(bdev, pos, iter)) return -EINVAL; - if (atomic_write && !blkdev_atomic_write_valid(bdev, pos, iter)) + if (atomic_write && + !blkdev_atomic_write_valid(bdev, pos, iov_iter_count(iter))) return -EINVAL; if (nr_pages <= DIO_INLINE_BIO_VECS) @@ -348,7 +349,8 @@ static ssize_t __blkdev_direct_IO_async(struct kiocb *iocb, if (blkdev_dio_unaligned(bdev, pos, iter)) return -EINVAL; - if (atomic_write && !blkdev_atomic_write_valid(bdev, pos, iter)) + if (atomic_write && + !blkdev_atomic_write_valid(bdev, pos, iov_iter_count(iter))) return -EINVAL; if (iocb->ki_flags & IOCB_ALLOC_CACHE) diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index f70988083734..5a3124fc191f 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1566,6 +1566,8 @@ static inline int early_lookup_bdev(const char *pathname, dev_t *dev) int freeze_bdev(struct block_device *bdev); int thaw_bdev(struct block_device *bdev); +bool blkdev_atomic_write_valid(struct block_device *bdev, loff_t pos, size_t len); + struct io_comp_batch { struct request *req_list; bool need_ts;