From patchwork Mon May 22 13:49:50 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 13250644 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6E661C7EE2F for ; Mon, 22 May 2023 13:52:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230362AbjEVNwP (ORCPT ); Mon, 22 May 2023 09:52:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59008 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233879AbjEVNwE (ORCPT ); Mon, 22 May 2023 09:52:04 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4BEEA19B for ; Mon, 22 May 2023 06:50:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1684763446; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=IqkXhDjcGTp5qgC2QwXKM8JLGfM3IWsybre/9cqiJ5w=; b=RmY4bl/piiTolGCkW5+aW8msXjufuay44u+muJfNFv/5ire5rRdEUhYZUipdHD9IoeG81n j0y18CuiW1508gdcau7QD5laVBi4hcaW+SKn9c/4hcuxn9sCEANxhItjHtl+OP41gv5axg MJ8GOFO5HRfyFJUYauBjn4R1qhKLaRQ= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-383-QM4O9WzdNfyEMQKKRbb3Hw-1; Mon, 22 May 2023 09:50:40 -0400 X-MC-Unique: QM4O9WzdNfyEMQKKRbb3Hw-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 695863C025AD; Mon, 22 May 2023 13:50:37 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.39.192.68]) by smtp.corp.redhat.com (Postfix) with ESMTP id 88BEA2166B25; Mon, 22 May 2023 13:50:34 +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 , linux-cifs@vger.kernel.org Subject: [PATCH v22 03/31] splice: Rename direct_splice_read() to copy_splice_read() Date: Mon, 22 May 2023 14:49:50 +0100 Message-Id: <20230522135018.2742245-4-dhowells@redhat.com> In-Reply-To: <20230522135018.2742245-1-dhowells@redhat.com> References: <20230522135018.2742245-1-dhowells@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.6 Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org Rename direct_splice_read() to copy_splice_read() to better reflect as to what it does. Suggested-by: Christoph Hellwig Signed-off-by: David Howells Reviewed-by: Christoph Hellwig Reviewed-by: Christian Brauner cc: Steve French cc: Jens Axboe cc: Al Viro cc: linux-cifs@vger.kernel.org cc: linux-mm@kvack.org cc: linux-block@vger.kernel.org cc: linux-fsdevel@vger.kernel.org --- Notes: ver #21) - Rename direct_splice_read() to copy_splice_read(). fs/cifs/cifsfs.c | 4 ++-- fs/cifs/file.c | 2 +- fs/splice.c | 11 +++++------ include/linux/fs.h | 6 +++--- 4 files changed, 11 insertions(+), 12 deletions(-) diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c index 43a4d8603db3..fa2477bbcc86 100644 --- a/fs/cifs/cifsfs.c +++ b/fs/cifs/cifsfs.c @@ -1416,7 +1416,7 @@ const struct file_operations cifs_file_direct_ops = { .fsync = cifs_fsync, .flush = cifs_flush, .mmap = cifs_file_mmap, - .splice_read = direct_splice_read, + .splice_read = copy_splice_read, .splice_write = iter_file_splice_write, .unlocked_ioctl = cifs_ioctl, .copy_file_range = cifs_copy_file_range, @@ -1470,7 +1470,7 @@ const struct file_operations cifs_file_direct_nobrl_ops = { .fsync = cifs_fsync, .flush = cifs_flush, .mmap = cifs_file_mmap, - .splice_read = direct_splice_read, + .splice_read = copy_splice_read, .splice_write = iter_file_splice_write, .unlocked_ioctl = cifs_ioctl, .copy_file_range = cifs_copy_file_range, diff --git a/fs/cifs/file.c b/fs/cifs/file.c index c5fcefdfd797..023496207c18 100644 --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -5091,6 +5091,6 @@ ssize_t cifs_splice_read(struct file *in, loff_t *ppos, if (unlikely(!len)) return 0; if (in->f_flags & O_DIRECT) - return direct_splice_read(in, ppos, pipe, len, flags); + return copy_splice_read(in, ppos, pipe, len, flags); return filemap_splice_read(in, ppos, pipe, len, flags); } diff --git a/fs/splice.c b/fs/splice.c index 3e06611d19ae..2478e065bc53 100644 --- a/fs/splice.c +++ b/fs/splice.c @@ -300,12 +300,11 @@ void splice_shrink_spd(struct splice_pipe_desc *spd) } /* - * Splice data from an O_DIRECT file into pages and then add them to the output - * pipe. + * Copy data from a file into pages and then splice those into the output pipe. */ -ssize_t direct_splice_read(struct file *in, loff_t *ppos, - struct pipe_inode_info *pipe, - size_t len, unsigned int flags) +ssize_t copy_splice_read(struct file *in, loff_t *ppos, + struct pipe_inode_info *pipe, + size_t len, unsigned int flags) { struct iov_iter to; struct bio_vec *bv; @@ -390,7 +389,7 @@ ssize_t direct_splice_read(struct file *in, loff_t *ppos, kfree(bv); return ret; } -EXPORT_SYMBOL(direct_splice_read); +EXPORT_SYMBOL(copy_splice_read); /** * generic_file_splice_read - splice data from file to a pipe diff --git a/include/linux/fs.h b/include/linux/fs.h index 21a981680856..e3c22efa413e 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2752,9 +2752,9 @@ ssize_t vfs_iocb_iter_write(struct file *file, struct kiocb *iocb, ssize_t filemap_splice_read(struct file *in, loff_t *ppos, struct pipe_inode_info *pipe, size_t len, unsigned int flags); -ssize_t direct_splice_read(struct file *in, loff_t *ppos, - struct pipe_inode_info *pipe, - size_t len, unsigned int flags); +ssize_t copy_splice_read(struct file *in, loff_t *ppos, + struct pipe_inode_info *pipe, + size_t len, unsigned int flags); extern ssize_t generic_file_splice_read(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int); extern ssize_t iter_file_splice_write(struct pipe_inode_info *, From patchwork Mon May 22 13:50:14 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 13250645 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5D9E6C77B75 for ; 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Mon, 22 May 2023 09:52:11 -0400 X-MC-Unique: yOayTwe9NkiCRekSvPPumw-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id BCAA9802355; Mon, 22 May 2023 13:52:10 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.39.192.68]) by smtp.corp.redhat.com (Postfix) with ESMTP id A8C11482060; Mon, 22 May 2023 13:52:07 +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 , Paulo Alcantara , Steve French , John Hubbard , linux-cifs@vger.kernel.org Subject: [PATCH v22 27/31] cifs: Use filemap_splice_read() Date: Mon, 22 May 2023 14:50:14 +0100 Message-Id: <20230522135018.2742245-28-dhowells@redhat.com> In-Reply-To: <20230522135018.2742245-1-dhowells@redhat.com> References: <20230522135018.2742245-1-dhowells@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.9 Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org Make cifs use filemap_splice_read() rather than doing its own version of generic_file_splice_read(). Signed-off-by: David Howells Reviewed-by: Christoph Hellwig Reviewed-by: Paulo Alcantara (SUSE) 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 #21) - Switch to filemap_splice_read() rather than generic_file_splice_read(). ver #20) - Don't remove the export of filemap_splice_read(). ver #18) - Split out from change to generic_file_splice_read(). fs/cifs/cifsfs.c | 8 ++++---- fs/cifs/cifsfs.h | 3 --- fs/cifs/file.c | 16 ---------------- 3 files changed, 4 insertions(+), 23 deletions(-) diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c index fa2477bbcc86..4f4492eb975f 100644 --- a/fs/cifs/cifsfs.c +++ b/fs/cifs/cifsfs.c @@ -1376,7 +1376,7 @@ const struct file_operations cifs_file_ops = { .fsync = cifs_fsync, .flush = cifs_flush, .mmap = cifs_file_mmap, - .splice_read = cifs_splice_read, + .splice_read = filemap_splice_read, .splice_write = iter_file_splice_write, .llseek = cifs_llseek, .unlocked_ioctl = cifs_ioctl, @@ -1396,7 +1396,7 @@ const struct file_operations cifs_file_strict_ops = { .fsync = cifs_strict_fsync, .flush = cifs_flush, .mmap = cifs_file_strict_mmap, - .splice_read = cifs_splice_read, + .splice_read = filemap_splice_read, .splice_write = iter_file_splice_write, .llseek = cifs_llseek, .unlocked_ioctl = cifs_ioctl, @@ -1434,7 +1434,7 @@ const struct file_operations cifs_file_nobrl_ops = { .fsync = cifs_fsync, .flush = cifs_flush, .mmap = cifs_file_mmap, - .splice_read = cifs_splice_read, + .splice_read = filemap_splice_read, .splice_write = iter_file_splice_write, .llseek = cifs_llseek, .unlocked_ioctl = cifs_ioctl, @@ -1452,7 +1452,7 @@ const struct file_operations cifs_file_strict_nobrl_ops = { .fsync = cifs_strict_fsync, .flush = cifs_flush, .mmap = cifs_file_strict_mmap, - .splice_read = cifs_splice_read, + .splice_read = filemap_splice_read, .splice_write = iter_file_splice_write, .llseek = cifs_llseek, .unlocked_ioctl = cifs_ioctl, diff --git a/fs/cifs/cifsfs.h b/fs/cifs/cifsfs.h index 74cd6fafb33e..d7274eefc666 100644 --- a/fs/cifs/cifsfs.h +++ b/fs/cifs/cifsfs.h @@ -100,9 +100,6 @@ extern ssize_t cifs_strict_readv(struct kiocb *iocb, struct iov_iter *to); extern ssize_t cifs_user_writev(struct kiocb *iocb, struct iov_iter *from); extern ssize_t cifs_direct_writev(struct kiocb *iocb, struct iov_iter *from); extern ssize_t cifs_strict_writev(struct kiocb *iocb, struct iov_iter *from); -extern ssize_t cifs_splice_read(struct file *in, loff_t *ppos, - struct pipe_inode_info *pipe, size_t len, - unsigned int flags); extern int cifs_flock(struct file *pfile, int cmd, struct file_lock *plock); extern int cifs_lock(struct file *, int, struct file_lock *); extern int cifs_fsync(struct file *, loff_t, loff_t, int); diff --git a/fs/cifs/file.c b/fs/cifs/file.c index 023496207c18..375a8037a3f3 100644 --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -5078,19 +5078,3 @@ const struct address_space_operations cifs_addr_ops_smallbuf = { .launder_folio = cifs_launder_folio, .migrate_folio = filemap_migrate_folio, }; - -/* - * Splice data from a file into a pipe. - */ -ssize_t cifs_splice_read(struct file *in, loff_t *ppos, - struct pipe_inode_info *pipe, size_t len, - unsigned int flags) -{ - if (unlikely(*ppos >= file_inode(in)->i_sb->s_maxbytes)) - return 0; - if (unlikely(!len)) - return 0; - if (in->f_flags & O_DIRECT) - return copy_splice_read(in, ppos, pipe, len, flags); - return filemap_splice_read(in, ppos, pipe, len, flags); -} From patchwork Mon May 22 13:50:16 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 13250679 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 56EF6C7EE29 for ; Mon, 22 May 2023 13:56:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233559AbjEVN4X (ORCPT ); Mon, 22 May 2023 09:56:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59356 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233981AbjEVNzo (ORCPT ); Mon, 22 May 2023 09:55:44 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6851719B4 for ; 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Mon, 22 May 2023 13:52:17 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.39.192.68]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0A30C40CFD45; Mon, 22 May 2023 13:52:14 +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 v22 29/31] splice: Remove generic_file_splice_read() Date: Mon, 22 May 2023 14:50:16 +0100 Message-Id: <20230522135018.2742245-30-dhowells@redhat.com> In-Reply-To: <20230522135018.2742245-1-dhowells@redhat.com> References: <20230522135018.2742245-1-dhowells@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org Remove generic_file_splice_read() as it has been replaced with calls to filemap_splice_read() and copy_splice_read(). With this, ITER_PIPE is no longer used. Signed-off-by: David Howells Reviewed-by: Christoph Hellwig Reviewed-by: Christian Brauner 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 #21) - Move zero-len check to vfs_splice_read(). - Move s_maxbytes check to filemap_splice_read(). - DIO (and DAX) are handled by vfs_splice_read(). ver #20) - Use s_maxbytes from the backing store (in->f_mapping), not the front inode (especially for a blockdev). 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 | 43 ------------------------------------------- include/linux/fs.h | 2 -- 2 files changed, 45 deletions(-) diff --git a/fs/splice.c b/fs/splice.c index 8268248df3a9..9be4cb3b9879 100644 --- a/fs/splice.c +++ b/fs/splice.c @@ -386,49 +386,6 @@ ssize_t copy_splice_read(struct file *in, loff_t *ppos, } EXPORT_SYMBOL(copy_splice_read); -/** - * generic_file_splice_read - splice data from file to a pipe - * @in: file to splice from - * @ppos: position in @in - * @pipe: pipe to splice to - * @len: number of bytes to splice - * @flags: splice modifier flags - * - * Description: - * Will read pages from given file and fill them into a pipe. Can be - * used as long as it has more or less sane ->read_iter(). - * - */ -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; -} -EXPORT_SYMBOL(generic_file_splice_read); - const struct pipe_buf_operations default_pipe_buf_ops = { .release = generic_pipe_buf_release, .try_steal = generic_pipe_buf_try_steal, diff --git a/include/linux/fs.h b/include/linux/fs.h index e3c22efa413e..08ba2ae1d3ce 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2755,8 +2755,6 @@ ssize_t filemap_splice_read(struct file *in, loff_t *ppos, ssize_t copy_splice_read(struct file *in, loff_t *ppos, struct pipe_inode_info *pipe, size_t len, unsigned int flags); -extern ssize_t generic_file_splice_read(struct file *, loff_t *, - struct pipe_inode_info *, size_t, unsigned int); extern ssize_t iter_file_splice_write(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe, From patchwork Mon May 22 13:50:18 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 13250680 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1040DC77B75 for ; Mon, 22 May 2023 13:56:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234425AbjEVN4z (ORCPT ); Mon, 22 May 2023 09:56:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59044 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234208AbjEVN42 (ORCPT ); Mon, 22 May 2023 09:56:28 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E2E371BE9 for ; Mon, 22 May 2023 06:52:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1684763549; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=1dW3gfal+wiqS1BsUQ7v1POUMzsncK8bE2BxQUdT+Fw=; b=MSIc70WlbW4QTA7Y/PU+fF7cHraUiYIAEhUKMDssJ8HHiyGZrSVbRA9rjZGRGlM+8gDjmt /+dhtyCMtQjisicd5Q1D54i6gpYZSG3M2rnk8ccQB2DRLv/Nk1n3MoyW97FipeG0rjjz+v EppuDeC+PdYi3ogVGwZELaJYIdg5r/I= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-401-O78IS1gQNUW2bLyo8CEsOA-1; Mon, 22 May 2023 09:52:26 -0400 X-MC-Unique: O78IS1gQNUW2bLyo8CEsOA-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.rdu2.redhat.com [10.11.54.7]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 213773C025AD; Mon, 22 May 2023 13:52:25 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.39.192.68]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6AEE4140E95D; Mon, 22 May 2023 13:52:22 +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 , linux-cifs@vger.kernel.org Subject: [PATCH v22 31/31] splice: kdoc for filemap_splice_read() and copy_splice_read() Date: Mon, 22 May 2023 14:50:18 +0100 Message-Id: <20230522135018.2742245-32-dhowells@redhat.com> In-Reply-To: <20230522135018.2742245-1-dhowells@redhat.com> References: <20230522135018.2742245-1-dhowells@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.7 Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org Provide kerneldoc comments for filemap_splice_read() and copy_splice_read(). Signed-off-by: David Howells cc: Christian Brauner cc: Christoph Hellwig cc: Jens Axboe cc: Steve French cc: Al Viro cc: linux-mm@kvack.org cc: linux-block@vger.kernel.org cc: linux-cifs@vger.kernel.org cc: linux-fsdevel@vger.kernel.org --- fs/splice.c | 21 +++++++++++++++++++-- mm/filemap.c | 21 ++++++++++++++++++--- 2 files changed, 37 insertions(+), 5 deletions(-) diff --git a/fs/splice.c b/fs/splice.c index 9be4cb3b9879..2420ead610a7 100644 --- a/fs/splice.c +++ b/fs/splice.c @@ -299,8 +299,25 @@ void splice_shrink_spd(struct splice_pipe_desc *spd) kfree(spd->partial); } -/* - * Copy data from a file into pages and then splice those into the output pipe. +/** + * copy_splice_read - Copy data from a file and splice the copy into a pipe + * @in: The file to read from + * @ppos: Pointer to the file position to read from + * @pipe: The pipe to splice into + * @len: The amount to splice + * @flags: The SPLICE_F_* flags + * + * This function allocates a bunch of pages sufficient to hold the requested + * amount of data (but limited by the remaining pipe capacity), passes it to + * the file's ->read_iter() to read into and then splices the used pages into + * the pipe. + * + * Return: On success, the number of bytes read will be returned and *@ppos + * will be updated if appropriate; 0 will be returned if there is no more data + * to be read; -EAGAIN will be returned if the pipe had no space, and some + * other negative error code will be returned on error. A short read may occur + * if the pipe has insufficient space, we reach the end of the data or we hit a + * hole. */ ssize_t copy_splice_read(struct file *in, loff_t *ppos, struct pipe_inode_info *pipe, diff --git a/mm/filemap.c b/mm/filemap.c index 603b562d69b1..f87e2ad8cff1 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -2871,9 +2871,24 @@ size_t splice_folio_into_pipe(struct pipe_inode_info *pipe, return spliced; } -/* - * Splice folios from the pagecache of a buffered (ie. non-O_DIRECT) file into - * a pipe. +/** + * filemap_splice_read - Splice data from a file's pagecache into a pipe + * @in: The file to read from + * @ppos: Pointer to the file position to read from + * @pipe: The pipe to splice into + * @len: The amount to splice + * @flags: The SPLICE_F_* flags + * + * This function gets folios from a file's pagecache and splices them into the + * pipe. Readahead will be called as necessary to fill more folios. This may + * be used for blockdevs also. + * + * Return: On success, the number of bytes read will be returned and *@ppos + * will be updated if appropriate; 0 will be returned if there is no more data + * to be read; -EAGAIN will be returned if the pipe had no space, and some + * other negative error code will be returned on error. A short read may occur + * if the pipe has insufficient space, we reach the end of the data or we hit a + * hole. */ ssize_t filemap_splice_read(struct file *in, loff_t *ppos, struct pipe_inode_info *pipe,