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xfs: support STATX_DIOALIGN

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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 <ebiggers@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Link: https://lore.kernel.org/r/20220827065851.135710-9-ebiggers@kernel.org
This commit is contained in:
Eric Biggers 2022-08-26 23:58:51 -07:00
parent c8c02272a9
commit 61a223df42
1 changed files with 10 additions and 0 deletions
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10
fs/xfs/xfs_iops.c
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@ -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;