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Wed, 3 May 2023 18:39:31 +0000 Received: from DM6PR10MB4313.namprd10.prod.outlook.com ([fe80::8456:ba59:80ec:d804]) by DM6PR10MB4313.namprd10.prod.outlook.com ([fe80::8456:ba59:80ec:d804%7]) with mapi id 15.20.6340.031; Wed, 3 May 2023 18:39:31 +0000 From: John Garry To: axboe@kernel.dk, kbusch@kernel.org, hch@lst.de, sagi@grimberg.me, martin.petersen@oracle.com, djwong@kernel.org, viro@zeniv.linux.org.uk, brauner@kernel.org, dchinner@redhat.com, jejb@linux.ibm.com Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, linux-scsi@vger.kernel.org, linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-security-module@vger.kernel.org, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, Prasad Singamsetty , John Garry Subject: [PATCH RFC 02/16] fs/bdev: Add atomic write support info to statx Date: Wed, 3 May 2023 18:38:07 +0000 Message-Id: <20230503183821.1473305-3-john.g.garry@oracle.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20230503183821.1473305-1-john.g.garry@oracle.com> References: <20230503183821.1473305-1-john.g.garry@oracle.com> X-ClientProxiedBy: DS7PR05CA0106.namprd05.prod.outlook.com (2603:10b6:8:56::24) To DM6PR10MB4313.namprd10.prod.outlook.com (2603:10b6:5:212::20) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6PR10MB4313:EE_|IA1PR10MB6171:EE_ X-MS-Office365-Filtering-Correlation-Id: 77e0a29a-5755-4916-9500-08db4c05bb90 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Add initial support for a block device. Signed-off-by: Prasad Singamsetty Signed-off-by: John Garry --- block/bdev.c | 21 +++++++++++++++++++++ fs/stat.c | 10 ++++++++++ include/linux/blkdev.h | 4 ++++ include/linux/stat.h | 2 ++ include/uapi/linux/stat.h | 7 ++++++- 5 files changed, 43 insertions(+), 1 deletion(-) diff --git a/block/bdev.c b/block/bdev.c index 1795c7d4b99e..6a5fd5abaadc 100644 --- a/block/bdev.c +++ b/block/bdev.c @@ -1014,3 +1014,24 @@ void bdev_statx_dioalign(struct inode *inode, struct kstat *stat) blkdev_put_no_open(bdev); } + +/* + * Handle statx for block devices to get properties of WRITE ATOMIC + * feature support. + */ +void bdev_statx_atomic(struct inode *inode, struct kstat *stat) +{ + struct block_device *bdev; + + bdev = blkdev_get_no_open(inode->i_rdev); + if (!bdev) + return; + + stat->atomic_write_unit_min = queue_atomic_write_unit_min(bdev->bd_queue); + stat->atomic_write_unit_max = queue_atomic_write_unit_max(bdev->bd_queue); + stat->attributes |= STATX_ATTR_WRITE_ATOMIC; + stat->attributes_mask |= STATX_ATTR_WRITE_ATOMIC; + stat->result_mask |= STATX_WRITE_ATOMIC; + + blkdev_put_no_open(bdev); +} diff --git a/fs/stat.c b/fs/stat.c index 7c238da22ef0..d20334a0e9ae 100644 --- a/fs/stat.c +++ b/fs/stat.c @@ -256,6 +256,14 @@ static int vfs_statx(int dfd, struct filename *filename, int flags, bdev_statx_dioalign(inode, stat); } + /* Handle STATX_WRITE_ATOMIC for block devices */ + if (request_mask & STATX_WRITE_ATOMIC) { + struct inode *inode = d_backing_inode(path.dentry); + + if (S_ISBLK(inode->i_mode)) + bdev_statx_atomic(inode, stat); + } + path_put(&path); if (retry_estale(error, lookup_flags)) { lookup_flags |= LOOKUP_REVAL; @@ -636,6 +644,8 @@ cp_statx(const struct kstat *stat, struct statx __user *buffer) tmp.stx_mnt_id = stat->mnt_id; tmp.stx_dio_mem_align = stat->dio_mem_align; tmp.stx_dio_offset_align = stat->dio_offset_align; + tmp.stx_atomic_write_unit_min = stat->atomic_write_unit_min; + tmp.stx_atomic_write_unit_max = stat->atomic_write_unit_max; return copy_to_user(buffer, &tmp, sizeof(tmp)) ? -EFAULT : 0; } diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 6b6f2992338c..19d33b2897b2 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1527,6 +1527,7 @@ 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_atomic(struct inode *inode, struct kstat *stat); void printk_all_partitions(void); #else static inline void invalidate_bdev(struct block_device *bdev) @@ -1546,6 +1547,9 @@ static inline void sync_bdevs(bool wait) static inline void bdev_statx_dioalign(struct inode *inode, struct kstat *stat) { } +static inline void bdev_statx_atomic(struct inode *inode, struct kstat *stat) +{ +} static inline void printk_all_partitions(void) { } diff --git a/include/linux/stat.h b/include/linux/stat.h index 52150570d37a..dfa69ecfaacf 100644 --- a/include/linux/stat.h +++ b/include/linux/stat.h @@ -53,6 +53,8 @@ struct kstat { u32 dio_mem_align; u32 dio_offset_align; u64 change_cookie; + u32 atomic_write_unit_max; + u32 atomic_write_unit_min; }; /* These definitions are internal to the kernel for now. Mainly used by nfsd. */ diff --git a/include/uapi/linux/stat.h b/include/uapi/linux/stat.h index 7cab2c65d3d7..c99d7cac2aa6 100644 --- a/include/uapi/linux/stat.h +++ b/include/uapi/linux/stat.h @@ -127,7 +127,10 @@ struct statx { __u32 stx_dio_mem_align; /* Memory buffer alignment for direct I/O */ __u32 stx_dio_offset_align; /* File offset alignment for direct I/O */ /* 0xa0 */ - __u64 __spare3[12]; /* Spare space for future expansion */ + __u32 stx_atomic_write_unit_max; + __u32 stx_atomic_write_unit_min; + /* 0xb0 */ + __u64 __spare3[11]; /* Spare space for future expansion */ /* 0x100 */ }; @@ -154,6 +157,7 @@ struct statx { #define STATX_BTIME 0x00000800U /* Want/got stx_btime */ #define STATX_MNT_ID 0x00001000U /* Got stx_mnt_id */ #define STATX_DIOALIGN 0x00002000U /* Want/got direct I/O alignment info */ +#define STATX_WRITE_ATOMIC 0x00004000U /* Want/got atomic_write_* fields */ #define STATX__RESERVED 0x80000000U /* Reserved for future struct statx expansion */ @@ -189,6 +193,7 @@ struct statx { #define STATX_ATTR_MOUNT_ROOT 0x00002000 /* Root of a mount */ #define STATX_ATTR_VERITY 0x00100000 /* [I] Verity protected file */ #define STATX_ATTR_DAX 0x00200000 /* File is currently in DAX state */ +#define STATX_ATTR_WRITE_ATOMIC 0x00400000 /* File supports atomic write operations */ #endif /* _UAPI_LINUX_STAT_H */