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xfs: Support atomic write for statx

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Support providing info on atomic write unit min and max for an inode.

For simplicity, currently we limit the min at the FS block size. As for
max, we limit also at FS block size, as there is no current method to
guarantee extent alignment or granularity for regular files.

Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: John Garry <john.g.garry@oracle.com>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
This commit is contained in:
John Garry
2024-11-04 16:14:03 -08:00
committed by Darrick J. Wong
parent 9e0933c21c
commit 6432c6e723
4 changed files with 48 additions and 0 deletions
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7
fs/xfs/xfs_buf.c
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@@ -2115,6 +2115,13 @@ xfs_alloc_buftarg(
btp->bt_daxdev = fs_dax_get_by_bdev(btp->bt_bdev, &btp->bt_dax_part_off,
mp, ops);
if (bdev_can_atomic_write(btp->bt_bdev)) {
btp->bt_bdev_awu_min = bdev_atomic_write_unit_min_bytes(
btp->bt_bdev);
btp->bt_bdev_awu_max = bdev_atomic_write_unit_max_bytes(
btp->bt_bdev);
}
/*
* When allocating the buftargs we have not yet read the super block and
* thus don't know the file system sector size yet.