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Thu, 20 Jun 2024 12:54:33 +0000 Received: from DM6PR10MB4313.namprd10.prod.outlook.com ([fe80::4f45:f4ab:121:e088]) by DM6PR10MB4313.namprd10.prod.outlook.com ([fe80::4f45:f4ab:121:e088%6]) with mapi id 15.20.7698.020; Thu, 20 Jun 2024 12:54:33 +0000 From: John Garry To: axboe@kernel.dk, kbusch@kernel.org, hch@lst.de, sagi@grimberg.me, jejb@linux.ibm.com, martin.petersen@oracle.com, viro@zeniv.linux.org.uk, brauner@kernel.org, dchinner@redhat.com, jack@suse.cz Cc: djwong@kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, linux-fsdevel@vger.kernel.org, tytso@mit.edu, jbongio@google.com, linux-scsi@vger.kernel.org, ojaswin@linux.ibm.com, linux-aio@kvack.org, linux-btrfs@vger.kernel.org, io-uring@vger.kernel.org, nilay@linux.ibm.com, ritesh.list@gmail.com, willy@infradead.org, agk@redhat.com, snitzer@kernel.org, mpatocka@redhat.com, dm-devel@lists.linux.dev, hare@suse.de, Prasad Singamsetty , John Garry Subject: [Patch v9 06/10] block: Add atomic write support for statx Date: Thu, 20 Jun 2024 12:53:55 +0000 Message-Id: <20240620125359.2684798-7-john.g.garry@oracle.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20240620125359.2684798-1-john.g.garry@oracle.com> References: <20240620125359.2684798-1-john.g.garry@oracle.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: BL0PR1501CA0029.namprd15.prod.outlook.com (2603:10b6:207:17::42) To DM6PR10MB4313.namprd10.prod.outlook.com (2603:10b6:5:212::20) Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6PR10MB4313:EE_|PH7PR10MB7695:EE_ X-MS-Office365-Filtering-Correlation-Id: 34c998f6-9695-46fb-4f64-08dc912821cd X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230037|376011|7416011|1800799021|366013|921017; 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Reviewed-by: Martin K. Petersen Signed-off-by: Prasad Singamsetty Signed-off-by: John Garry --- block/bdev.c | 36 ++++++++++++++++++++++++++---------- fs/stat.c | 16 +++++++++------- include/linux/blkdev.h | 6 ++++-- 3 files changed, 39 insertions(+), 19 deletions(-) diff --git a/block/bdev.c b/block/bdev.c index 353677ac49b3..3976a652fcc7 100644 --- a/block/bdev.c +++ b/block/bdev.c @@ -1260,23 +1260,39 @@ void sync_bdevs(bool wait) } /* - * Handle STATX_DIOALIGN for block devices. - * - * Note that the inode passed to this is the inode of a block device node file, - * not the block device's internal inode. Therefore it is *not* valid to use - * I_BDEV() here; the block device has to be looked up by i_rdev instead. + * Handle STATX_{DIOALIGN, WRITE_ATOMIC} for block devices. */ -void bdev_statx_dioalign(struct inode *inode, struct kstat *stat) +void bdev_statx(struct inode *backing_inode, struct kstat *stat, + u32 request_mask) { struct block_device *bdev; - bdev = blkdev_get_no_open(inode->i_rdev); + if (!(request_mask & (STATX_DIOALIGN | STATX_WRITE_ATOMIC))) + return; + + /* + * Note that backing_inode is the inode of a block device node file, + * not the block device's internal inode. Therefore it is *not* valid + * to use I_BDEV() here; the block device has to be looked up by i_rdev + * instead. + */ + bdev = blkdev_get_no_open(backing_inode->i_rdev); if (!bdev) return; - stat->dio_mem_align = bdev_dma_alignment(bdev) + 1; - stat->dio_offset_align = bdev_logical_block_size(bdev); - stat->result_mask |= STATX_DIOALIGN; + if (request_mask & STATX_DIOALIGN) { + stat->dio_mem_align = bdev_dma_alignment(bdev) + 1; + stat->dio_offset_align = bdev_logical_block_size(bdev); + stat->result_mask |= STATX_DIOALIGN; + } + + if (request_mask & STATX_WRITE_ATOMIC && bdev_can_atomic_write(bdev)) { + struct request_queue *bd_queue = bdev->bd_queue; + + generic_fill_statx_atomic_writes(stat, + queue_atomic_write_unit_min_bytes(bd_queue), + queue_atomic_write_unit_max_bytes(bd_queue)); + } blkdev_put_no_open(bdev); } diff --git a/fs/stat.c b/fs/stat.c index 72d0e6357b91..bd0698dfd7b3 100644 --- a/fs/stat.c +++ b/fs/stat.c @@ -265,6 +265,7 @@ static int vfs_statx(int dfd, struct filename *filename, int flags, { struct path path; unsigned int lookup_flags = getname_statx_lookup_flags(flags); + struct inode *backing_inode; int error; if (flags & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT | AT_EMPTY_PATH | @@ -290,13 +291,14 @@ static int vfs_statx(int dfd, struct filename *filename, int flags, stat->attributes |= STATX_ATTR_MOUNT_ROOT; stat->attributes_mask |= STATX_ATTR_MOUNT_ROOT; - /* Handle STATX_DIOALIGN for block devices. */ - if (request_mask & STATX_DIOALIGN) { - struct inode *inode = d_backing_inode(path.dentry); - - if (S_ISBLK(inode->i_mode)) - bdev_statx_dioalign(inode, stat); - } + /* + * If this is a block device inode, override the filesystem + * attributes with the block device specific parameters that need to be + * obtained from the bdev backing inode. + */ + backing_inode = d_backing_inode(path.dentry); + if (S_ISBLK(backing_inode->i_mode)) + bdev_statx(backing_inode, stat, request_mask); path_put(&path); if (retry_estale(error, lookup_flags)) { diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index c0a5a061f8b9..5e024b2b1311 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1644,7 +1644,8 @@ int sync_blockdev(struct block_device *bdev); int sync_blockdev_range(struct block_device *bdev, loff_t lstart, loff_t lend); int sync_blockdev_nowait(struct block_device *bdev); void sync_bdevs(bool wait); -void bdev_statx_dioalign(struct inode *inode, struct kstat *stat); +void bdev_statx(struct inode *backing_inode, struct kstat *stat, + u32 request_mask); void printk_all_partitions(void); int __init early_lookup_bdev(const char *pathname, dev_t *dev); #else @@ -1662,7 +1663,8 @@ static inline int sync_blockdev_nowait(struct block_device *bdev) static inline void sync_bdevs(bool wait) { } -static inline void bdev_statx_dioalign(struct inode *inode, struct kstat *stat) +static inline void bdev_statx(struct inode *backing_inode, struct kstat *stat, + u32 request_mask) { } static inline void printk_all_partitions(void) -- 2.31.1