[RFC PATCH 06/17] btrfs: disable direct IO in HMZONED mode

[Naohiro Aota]

Direct write I/Os can be directed at existing extents that have already
been written. Such write requests are prohibited on host-managed zoned
block devices. So disable direct IO support for a volume with HMZONED mode
enabled.

Signed-off-by: Naohiro Aota <naota@xxxxxxxxx>
---
 fs/btrfs/inode.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 212fa71317d6..05f5e05ccf37 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -8523,6 +8523,9 @@ static ssize_t check_direct_IO(struct btrfs_fs_info *fs_info,
 	unsigned int blocksize_mask = fs_info->sectorsize - 1;
 	ssize_t retval = -EINVAL;
 
+	if (btrfs_fs_incompat(fs_info, HMZONED))
+		goto out;
+
 	if (offset & blocksize_mask)
 		goto out;
 
-- 
2.18.0