Re: [PATCH v5 8/8] xfs: support STATX_DIOALIGN
From: "Darrick J. Wong" <djwong@kernel.org>
Date: 2022-08-27 15:34:59
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linux-api, linux-block, linux-f2fs-devel, linux-fscrypt, linux-fsdevel, linux-xfs, lkml
On Fri, Aug 26, 2022 at 11:58:51PM -0700, Eric Biggers wrote:
From: Eric Biggers <redacted> 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: Eric Biggers <redacted>
Looks good to me; I particularly like the adjustment to report the device's DMA alignment. Someone should probably fix DIONINFO, or perhaps turn it into a getattr wrapper and hoist it? IMHO none of those suggestions are necessary to land this patch, though. Reviewed-by: Darrick J. Wong <djwong@kernel.org> --D
quoted hunk ↗ jump to hunk
--- fs/xfs/xfs_iops.c | 10 ++++++++++ 1 file changed, 10 insertions(+)diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c index 45518b8c613c9a..f51c60d7e2054a 100644 --- a/fs/xfs/xfs_iops.c +++ b/fs/xfs/xfs_iops.c@@ -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;-- 2.37.2