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From: Miklos Szeredi <mszeredi@redhat.com>
To: linux-fsdevel@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, Al Viro <viro@zeniv.linux.org.uk>
Subject: [PATCH 04/11] pipe: add pipe_buf_steal() helper
Date: Wed, 14 Sep 2016 10:37:09 +0200	[thread overview]
Message-ID: <1473842236-28655-5-git-send-email-mszeredi@redhat.com> (raw)
In-Reply-To: <1473842236-28655-1-git-send-email-mszeredi@redhat.com>

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
---
 drivers/char/virtio_console.c |  2 +-
 fs/fuse/dev.c                 |  2 +-
 include/linux/pipe_fs_i.h     | 11 +++++++++++
 3 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 5da47e26a012..8114744bf30c 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -889,7 +889,7 @@ static int pipe_to_sg(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
 		return 0;
 
 	/* Try lock this page */
-	if (buf->ops->steal(pipe, buf) == 0) {
+	if (pipe_buf_steal(pipe, buf) == 0) {
 		/* Get reference and unlock page for moving */
 		get_page(buf->page);
 		unlock_page(buf->page);
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 9aa757f283e5..6830b3ca1bbb 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -841,7 +841,7 @@ static int fuse_try_move_page(struct fuse_copy_state *cs, struct page **pagep)
 	if (cs->len != PAGE_SIZE)
 		goto out_fallback;
 
-	if (buf->ops->steal(cs->pipe, buf) != 0)
+	if (pipe_buf_steal(cs->pipe, buf) != 0)
 		goto out_fallback;
 
 	newpage = buf->page;
diff --git a/include/linux/pipe_fs_i.h b/include/linux/pipe_fs_i.h
index 654413334537..bddccf0159bb 100644
--- a/include/linux/pipe_fs_i.h
+++ b/include/linux/pipe_fs_i.h
@@ -151,6 +151,17 @@ static inline int pipe_buf_confirm(struct pipe_inode_info *pipe,
 	return buf->ops->confirm(pipe, buf);
 }
 
+/**
+ * pipe_buf_steal - attempt to take ownership of a pipe_buffer
+ * @pipe:	the pipe that the buffer belongs to
+ * @buf:	the buffer to attempt to steal
+ */
+static inline int pipe_buf_steal(struct pipe_inode_info *pipe,
+				 struct pipe_buffer *buf)
+{
+	return buf->ops->steal(pipe, buf);
+}
+
 /* Differs from PIPE_BUF in that PIPE_SIZE is the length of the actual
    memory allocation, whereas PIPE_BUF makes atomicity guarantees.  */
 #define PIPE_SIZE		PAGE_SIZE
-- 
2.5.5

  parent reply	other threads:[~2016-09-14  8:40 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-09-14  8:37 [PATCH 00/11] splice cleanups Miklos Szeredi
2016-09-14  8:37 ` [PATCH 01/11] pipe: add pipe_buf_get() helper Miklos Szeredi
2016-09-14  8:37 ` [PATCH 02/11] pipe: add pipe_buf_release() helper Miklos Szeredi
2016-09-14  8:37 ` [PATCH 03/11] pipe: add pipe_buf_confirm() helper Miklos Szeredi
2016-09-14  8:37 ` Miklos Szeredi [this message]
2016-09-14  8:37 ` [PATCH 05/11] pipe: fix comment in pipe_buf_operations Miklos Szeredi
2016-09-14  8:37 ` [PATCH 06/11] pipe: no need to confirm page cache buf Miklos Szeredi
2016-09-27  3:40   ` Al Viro
2016-09-27  7:34     ` Miklos Szeredi
2016-09-14  8:37 ` [PATCH 07/11] pipe: remove generic_pipe_buf_confirm() Miklos Szeredi
2016-09-16 11:23   ` Christoph Hellwig
2016-09-14  8:37 ` [PATCH 08/11] filemap: add get_page_for_read() helper Miklos Szeredi
2016-09-27  3:43   ` Al Viro
2016-09-14  8:37 ` [PATCH 09/11] splice: use get_page_for_read() Miklos Szeredi
2016-09-27  3:45   ` Al Viro
2016-09-14  8:37 ` [PATCH 10/11] splice: don't check i_size in generic_file_splice_read() Miklos Szeredi
2016-09-14  8:37 ` [PATCH 11/11] splice: fold __generic_file_splice_read() into caller Miklos Szeredi
2016-09-14  8:55 ` [PATCH 00/11] splice cleanups Cedric Blancher
2016-09-14  9:30   ` Miklos Szeredi
2016-09-16 11:24 ` Christoph Hellwig
2016-09-27  3:55 ` Al Viro

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