Commit 61a223df authored by Eric Biggers's avatar Eric Biggers
Browse files

xfs: support STATX_DIOALIGN 



Add support for STATX_DIOALIGN to xfs, so that direct I/O alignment
restrictions are exposed to userspace in a generic way.

Signed-off-by: default avatarEric Biggers <ebiggers@google.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarDarrick J. Wong <djwong@kernel.org>
Link: https://lore.kernel.org/r/20220827065851.135710-9-ebiggers@kernel.org
parent c8c02272

fs/xfs/xfs_iops.c

+10 −0
Original line number Diff line number Diff line
@@ -604,6 +604,16 @@ xfs_vn_getattr( 
		stat->blksize = BLKDEV_IOSIZE;

		stat->rdev = inode->i_rdev;

		break;

	case S_IFREG:

		if (request_mask & STATX_DIOALIGN) {

			struct xfs_buftarg	*target = xfs_inode_buftarg(ip);

			struct block_device	*bdev = target->bt_bdev;



			stat->result_mask |= STATX_DIOALIGN;

			stat->dio_mem_align = bdev_dma_alignment(bdev) + 1;

			stat->dio_offset_align = bdev_logical_block_size(bdev);

		}

		fallthrough;

	default:

		stat->blksize = xfs_stat_blksize(ip);

		stat->rdev = 0;