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Wed, 15 Mar 2023 12:36:15 -0400 X-MC-Unique: WUgqb5XdM1OrTaCbnHUsDQ-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id B3540185A78F; Wed, 15 Mar 2023 16:36:14 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.33.36.18]) by smtp.corp.redhat.com (Postfix) with ESMTP id 639B01121314; Wed, 15 Mar 2023 16:36:12 +0000 (UTC) From: David Howells To: Jens Axboe , Al Viro , Christoph Hellwig Cc: David Howells , Matthew Wilcox , Jan Kara , Jeff Layton , David Hildenbrand , Jason Gunthorpe , Logan Gunthorpe , Hillf Danton , Christian Brauner , Linus Torvalds , linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Christoph Hellwig , Steve French , John Hubbard , linux-cifs@vger.kernel.org Subject: [PATCH v19 07/15] splice: Do splice read from a file without using ITER_PIPE Date: Wed, 15 Mar 2023 16:35:41 +0000 Message-Id: <20230315163549.295454-8-dhowells@redhat.com> In-Reply-To: <20230315163549.295454-1-dhowells@redhat.com> References: <20230315163549.295454-1-dhowells@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.1 on 10.11.54.3 X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: C924514001C X-Stat-Signature: tuihox71m3ziftw5t7yedzgh55puyxwx X-HE-Tag: 1678898179-483745 X-HE-Meta: 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 HXvZivtV 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Make generic_file_splice_read() use filemap_splice_read() and direct_splice_read() rather than using an ITER_PIPE and call_read_iter(). With this, ITER_PIPE is no longer used. Signed-off-by: David Howells Reviewed-by: Christoph Hellwig cc: Jens Axboe cc: Steve French cc: Al Viro cc: David Hildenbrand cc: John Hubbard cc: linux-mm@kvack.org cc: linux-block@vger.kernel.org cc: linux-cifs@vger.kernel.org cc: linux-fsdevel@vger.kernel.org --- Notes: ver #18) - Split out the change to cifs to make it use generic_file_splice_read(). - Split out the unexport of filemap_splice_read() (still needed by cifs). fs/splice.c | 30 +++++++----------------------- 1 file changed, 7 insertions(+), 23 deletions(-) diff --git a/fs/splice.c b/fs/splice.c index 90ccd3666dca..f46dd1fb367b 100644 --- a/fs/splice.c +++ b/fs/splice.c @@ -387,29 +387,13 @@ ssize_t generic_file_splice_read(struct file *in, loff_t *ppos, struct pipe_inode_info *pipe, size_t len, unsigned int flags) { - struct iov_iter to; - struct kiocb kiocb; - int ret; - - iov_iter_pipe(&to, ITER_DEST, pipe, len); - init_sync_kiocb(&kiocb, in); - kiocb.ki_pos = *ppos; - ret = call_read_iter(in, &kiocb, &to); - if (ret > 0) { - *ppos = kiocb.ki_pos; - file_accessed(in); - } else if (ret < 0) { - /* free what was emitted */ - pipe_discard_from(pipe, to.start_head); - /* - * callers of ->splice_read() expect -EAGAIN on - * "can't put anything in there", rather than -EFAULT. - */ - if (ret == -EFAULT) - ret = -EAGAIN; - } - - return ret; + if (unlikely(*ppos >= file_inode(in)->i_sb->s_maxbytes)) + return 0; + if (unlikely(!len)) + return 0; + if (in->f_flags & O_DIRECT) + return direct_splice_read(in, ppos, pipe, len, flags); + return filemap_splice_read(in, ppos, pipe, len, flags); } EXPORT_SYMBOL(generic_file_splice_read);