linux-kernel - Re: [PATCH v14 00/17] iov_iter: Improve page extraction (pin or just list)

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Message-ID: <2895995.1676448478@warthog.procyon.org.uk>
Date:   Wed, 15 Feb 2023 08:07:58 +0000
From:   David Howells <dhowells@...hat.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     dhowells@...hat.com, smfrench@...il.com,
        Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@...radead.org>,
        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
Subject: Re: [PATCH v14 00/17] iov_iter: Improve page extraction (pin or just list)

Jens Axboe <axboe@...nel.dk> wrote:

> Let's update the branch and see how it goes... If there's more fallout, then
> let's make a fallback plan for the first few.

I forgot to export the new functions, as Steve found out.  Fix attached.

David
---
splice: Export filemap/direct_splice_read()

filemap_splice_read() and direct_splice_read() should be exported.

Signed-off-by: David Howells <dhowells@...hat.com>
cc: Steve French <sfrench@...ba.org>
cc: Jens Axboe <axboe@...nel.dk>
cc: Christoph Hellwig <hch@....de>
cc: Al Viro <viro@...iv.linux.org.uk>
cc: David Hildenbrand <david@...hat.com>
cc: John Hubbard <jhubbard@...dia.com>
cc: linux-cifs@...r.kernel.org
cc: linux-mm@...ck.org
cc: linux-block@...r.kernel.org
cc: linux-fsdevel@...r.kernel.org
---
 fs/splice.c  |    1 +
 mm/filemap.c |    1 +
 2 files changed, 2 insertions(+)

diff --git a/fs/splice.c b/fs/splice.c
index 4c6332854b63..928c7be2f318 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -373,6 +373,7 @@ ssize_t direct_splice_read(struct file *in, loff_t *ppos,
 	kfree(bv);
 	return ret;
 }
+EXPORT_SYMBOL(direct_splice_read);
 
 /**
  * generic_file_splice_read - splice data from file to a pipe
diff --git a/mm/filemap.c b/mm/filemap.c
index 8c7b135c8e23..570f86578f7c 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2969,6 +2969,7 @@ ssize_t filemap_splice_read(struct file *in, loff_t *ppos,
 
 	return total_spliced ? total_spliced : error;
 }
+EXPORT_SYMBOL(filemap_splice_read);
 
 static inline loff_t folio_seek_hole_data(struct xa_state *xas,
 		struct address_space *mapping, struct folio *folio,