Hi Laurance,
please try the patch below:
---
>From 69febe1cfb55844862f768447432249781001f9c Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@xxxxxx>
Date: Thu, 22 Dec 2016 16:38:29 +0100
Subject: block: add back plugging in __blkdev_direct_IO
This allows sending larger than 1 MB requess to devices that support
large I/O sizes.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reported-by: Laurence Oberman <loberman@xxxxxxxxxx>
---
fs/block_dev.c | 3 +++
fs/iomap.c | 1 -
2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 7c45072..206a92a 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -328,6 +328,7 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages)
struct file *file = iocb->ki_filp;
struct inode *inode = bdev_file_inode(file);
struct block_device *bdev = I_BDEV(inode);
+ struct blk_plug plug;
struct blkdev_dio *dio;
struct bio *bio;
bool is_read = (iov_iter_rw(iter) == READ);
@@ -353,6 +354,7 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages)
dio->multi_bio = false;
dio->should_dirty = is_read && (iter->type == ITER_IOVEC);
+ blk_start_plug(&plug);
for (;;) {
bio->bi_bdev = bdev;
bio->bi_iter.bi_sector = pos >> 9;
@@ -394,6 +396,7 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages)
submit_bio(bio);
bio = bio_alloc(GFP_KERNEL, nr_pages);
}
+ blk_finish_plug(&plug);
if (!dio->is_sync)
return -EIOCBQUEUED;
diff --git a/fs/iomap.c b/fs/iomap.c
index 354a123..3adf1e1 100644
--- a/fs/iomap.c
+++ b/fs/iomap.c
@@ -844,7 +844,6 @@ iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter, struct iomap_ops *ops,
size_t count = iov_iter_count(iter);
loff_t pos = iocb->ki_pos, end = iocb->ki_pos + count - 1, ret = 0;
unsigned int flags = IOMAP_DIRECT;
- struct blk_plug plug;
struct iomap_dio *dio;
lockdep_assert_held(&inode->i_rwsem);
--
2.1.4
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