Commit 647d1e4c authored by Fengguang Wu's avatar Fengguang Wu Committed by Jens Axboe
Browse files

block: move down direct IO plugging 



Move unplugging for direct I/O from around ->direct_IO() down to
do_blockdev_direct_IO(). This implicitly adds plugging for direct
writes.

CC: Li Shaohua <shli@fusionio.com>
Acked-by: default avatarJeff Moyer <jmoyer@redhat.com>
Signed-off-by: default avatarWu Fengguang <fengguang.wu@intel.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 8430f977

fs/direct-io.c

+5 −0
Original line number Diff line number Diff line
@@ -1062,6 +1062,7 @@ do_blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, 
	unsigned long user_addr;

	size_t bytes;

	struct buffer_head map_bh = { 0, };

	struct blk_plug plug;



	if (rw & WRITE)

		rw = WRITE_ODIRECT;
@@ -1177,6 +1178,8 @@ do_blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, 
				PAGE_SIZE - user_addr / PAGE_SIZE);

	}



	blk_start_plug(&plug);



	for (seg = 0; seg < nr_segs; seg++) {

		user_addr = (unsigned long)iov[seg].iov_base;

		sdio.size += bytes = iov[seg].iov_len;
@@ -1235,6 +1238,8 @@ do_blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, 
	if (sdio.bio)

		dio_bio_submit(dio, &sdio);



	blk_finish_plug(&plug);



	/*

	 * It is possible that, we return short IO due to end of file.

	 * In that case, we need to release all the pages we got hold on.

mm/filemap.c

+0 −4
Original line number Diff line number Diff line
@@ -1412,12 +1412,8 @@ generic_file_aio_read(struct kiocb *iocb, const struct iovec *iov, 
			retval = filemap_write_and_wait_range(mapping, pos,

					pos + iov_length(iov, nr_segs) - 1);

			if (!retval) {

				struct blk_plug plug;



				blk_start_plug(&plug);

				retval = mapping->a_ops->direct_IO(READ, iocb,

							iov, pos, nr_segs);

				blk_finish_plug(&plug);

			}

			if (retval > 0) {

				*ppos = pos + retval;

CRA Git | Maintained and supported by SUSTech CRA and CCSE