[PATCH 05/19] 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 <naohiro.a...@wdc.com>
---
 fs/btrfs/inode.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 6bebc0ca751d..89542c19d09e 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -8520,6 +8520,9 @@ 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;
 
-- 
2.21.0