linux-kernel - [PATCH 05/19] btrfs: disable direct IO in HMZONED mode

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Message-Id: <20190607131025.31996-6-naohiro.aota@wdc.com>
Date:   Fri,  7 Jun 2019 22:10:11 +0900
From:   Naohiro Aota <naohiro.aota@....com>
To:     linux-btrfs@...r.kernel.org, David Sterba <dsterba@...e.com>
Cc:     Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
        Qu Wenruo <wqu@...e.com>, Nikolay Borisov <nborisov@...e.com>,
        linux-kernel@...r.kernel.org, Hannes Reinecke <hare@...e.com>,
        linux-fsdevel@...r.kernel.org,
        Damien Le Moal <damien.lemoal@....com>,
        Matias Bjørling <mb@...htnvm.io>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        Bart Van Assche <bvanassche@....org>,
        Naohiro Aota <naohiro.aota@....com>
Subject: [PATCH 05/19] btrfs: disable direct IO in HMZONED mode

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.aota@....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