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Mon, 19 Feb 2024 13:01:44 +0000 Received: from DM6PR10MB4313.namprd10.prod.outlook.com ([fe80::56f9:2210:db18:61c4]) by DM6PR10MB4313.namprd10.prod.outlook.com ([fe80::56f9:2210:db18:61c4%4]) with mapi id 15.20.7292.036; Mon, 19 Feb 2024 13:01:44 +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, djwong@kernel.org, viro@zeniv.linux.org.uk, brauner@kernel.org, dchinner@redhat.com, jack@suse.cz Cc: 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, Prasad Singamsetty , John Garry Subject: [PATCH v4 06/11] block: Add atomic write support for statx Date: Mon, 19 Feb 2024 13:01:04 +0000 Message-Id: <20240219130109.341523-7-john.g.garry@oracle.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20240219130109.341523-1-john.g.garry@oracle.com> References: <20240219130109.341523-1-john.g.garry@oracle.com> X-ClientProxiedBy: SJ0PR03CA0279.namprd03.prod.outlook.com (2603:10b6:a03:39e::14) To DM6PR10MB4313.namprd10.prod.outlook.com (2603:10b6:5:212::20) Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6PR10MB4313:EE_|DS0PR10MB6894:EE_ X-MS-Office365-Filtering-Correlation-Id: 2f366cc6-abdd-41c3-5362-08dc314aec82 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Signed-off-by: Prasad Singamsetty Signed-off-by: John Garry --- block/bdev.c | 37 +++++++++++++++++++++++++++---------- fs/stat.c | 13 ++++++------- include/linux/blkdev.h | 5 +++-- 3 files changed, 36 insertions(+), 19 deletions(-) diff --git a/block/bdev.c b/block/bdev.c index e9f1b12bd75c..0dada9902bd4 100644 --- a/block/bdev.c +++ b/block/bdev.c @@ -1116,24 +1116,41 @@ void sync_bdevs(bool wait) iput(old_inode); } +#define BDEV_STATX_SUPPORTED_MASK (STATX_DIOALIGN | STATX_WRITE_ATOMIC) + /* - * 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 dentry *dentry, struct kstat *stat, u32 request_mask) { struct block_device *bdev; - bdev = blkdev_get_no_open(inode->i_rdev); + if (!(request_mask & BDEV_STATX_SUPPORTED_MASK)) + return; + + /* + * Note that d_backing_inode() returns 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(d_backing_inode(dentry)->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 522787a4ab6a..bd0618477702 100644 --- a/fs/stat.c +++ b/fs/stat.c @@ -290,13 +290,12 @@ 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 + */ + if (S_ISBLK(d_backing_inode(path.dentry)->i_mode)) + bdev_statx(path.dentry, 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 40ed56ef4937..4f04456f1250 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1541,7 +1541,7 @@ 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 dentry *dentry, struct kstat *stat, u32 request_mask); void printk_all_partitions(void); int __init early_lookup_bdev(const char *pathname, dev_t *dev); #else @@ -1559,7 +1559,8 @@ 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 dentry *dentry, struct kstat *stat, + u32 request_mask) { } static inline void printk_all_partitions(void)