linux-kernel - [PATCH 3/4] splice: Use init_sync_kiocb() in filemap_splice

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Date:   Mon, 13 Feb 2023 13:46:18 +0000
From:   David Howells <dhowells@...hat.com>
To:     Jens Axboe <axboe@...nel.dk>, Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@...radead.org>
Cc:     David Howells <dhowells@...hat.com>,
        Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>,
        Jeff Layton <jlayton@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Hillf Danton <hdanton@...a.com>, linux-fsdevel@...r.kernel.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Christoph Hellwig <hch@....de>,
        John Hubbard <jhubbard@...dia.com>
Subject: [PATCH 3/4] splice: Use init_sync_kiocb() in filemap_splice_read()

Use init_sync_kiocb() in filemap_splice_read() rather than open coding it
and filter out IOCB_NOWAIT since the splice is synchronous.

Requested-by: Christoph Hellwig <hch@....de>
Signed-off-by: David Howells <dhowells@...hat.com>
cc: Christoph Hellwig <hch@....de>
cc: Jens Axboe <axboe@...nel.dk>
cc: Al Viro <viro@...iv.linux.org.uk>
cc: John Hubbard <jhubbard@...dia.com>
cc: David Hildenbrand <david@...hat.com>
cc: Matthew Wilcox <willy@...radead.org>
cc: linux-block@...r.kernel.org
cc: linux-fsdevel@...r.kernel.org
cc: linux-mm@...ck.org
---
 fs/splice.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/splice.c b/fs/splice.c
index 7c0ff187f87a..8b2a9d963bc4 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -419,15 +419,15 @@ static ssize_t filemap_splice_read(struct file *in, loff_t *ppos,
 				   size_t len, unsigned int flags)
 {
 	struct folio_batch fbatch;
+	struct kiocb iocb;
 	size_t total_spliced = 0, used, npages;
 	loff_t isize, end_offset;
 	bool writably_mapped;
 	int i, error = 0;
 
-	struct kiocb iocb = {
-		.ki_filp	= in,
-		.ki_pos		= *ppos,
-	};
+	init_sync_kiocb(&iocb, in);
+	iocb.ki_pos = *ppos;
+	iocb.ki_flags &= IOCB_NOWAIT;
 
 	/* Work out how much data we can actually add into the pipe */
 	used = pipe_occupancy(pipe->head, pipe->tail);