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Message-Id: <1477728600-12938-27-git-send-email-tom.leiming@gmail.com>
Date: Sat, 29 Oct 2016 16:08:25 +0800
From: Ming Lei <tom.leiming@...il.com>
To: Jens Axboe <axboe@...com>, linux-kernel@...r.kernel.org
Cc: linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
Christoph Hellwig <hch@...radead.org>,
"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
Ming Lei <tom.leiming@...il.com>, Chris Mason <clm@...com>,
Josef Bacik <jbacik@...com>, David Sterba <dsterba@...e.com>,
linux-btrfs@...r.kernel.org (open list:BTRFS FILE SYSTEM)
Subject: [PATCH 26/60] btrfs: set NO_MP for request queues behind BTRFS
There are lots of direct access to .bi_vcnt & .bi_io_vec
of bio, and it isn't ready to support multipage bvecs
for BTRFS, so set NO_MP for these request queues.
Signed-off-by: Ming Lei <tom.leiming@...il.com>
---
fs/btrfs/volumes.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 71a60cc01451..2e7237a3b84d 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1011,6 +1011,9 @@ static int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
if (blk_queue_discard(q))
device->can_discard = 1;
+ /* BTRFS isn't ready to support multipage bvecs */
+ set_bit(QUEUE_FLAG_NO_MP, &q->queue_flags);
+
device->bdev = bdev;
device->in_fs_metadata = 0;
device->mode = flags;
--
2.7.4
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