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Commit 330ab716 authored by Jens Axboe's avatar Jens Axboe
Browse files

[PATCH] vmsplice: restrict stealing a little more 



Apply the same rules as the anon pipe pages, only allow stealing
if no one else is using the page.

Signed-off-by: default avatarJens Axboe <axboe@suse.de>
parent a893b99b

fs/pipe.c

+3 −3
Original line number Diff line number Diff line
@@ -184,7 +184,7 @@ void generic_pipe_buf_unmap(struct pipe_inode_info *pipe, 
		kunmap(buf->page);

}



static int anon_pipe_buf_steal(struct pipe_inode_info *pipe,

int generic_pipe_buf_steal(struct pipe_inode_info *pipe,

			   struct pipe_buffer *buf)

{

	struct page *page = buf->page;
@@ -213,7 +213,7 @@ static struct pipe_buf_operations anon_pipe_buf_ops = { 
	.unmap = generic_pipe_buf_unmap,

	.pin = generic_pipe_buf_pin,

	.release = anon_pipe_buf_release,

	.steal = anon_pipe_buf_steal,

	.steal = generic_pipe_buf_steal,

	.get = generic_pipe_buf_get,

};

fs/splice.c

+1 −1
Original line number Diff line number Diff line
@@ -141,7 +141,7 @@ static int user_page_pipe_buf_steal(struct pipe_inode_info *pipe, 
	if (!(buf->flags & PIPE_BUF_FLAG_GIFT))

		return 1;



	return 0;

	return generic_pipe_buf_steal(pipe, buf);

}



static struct pipe_buf_operations user_page_pipe_buf_ops = {

include/linux/pipe_fs_i.h

+1 −0
Original line number Diff line number Diff line
@@ -69,6 +69,7 @@ void *generic_pipe_buf_map(struct pipe_inode_info *, struct pipe_buffer *, int); 
void generic_pipe_buf_unmap(struct pipe_inode_info *, struct pipe_buffer *, void *);

void generic_pipe_buf_get(struct pipe_inode_info *, struct pipe_buffer *);

int generic_pipe_buf_pin(struct pipe_inode_info *, struct pipe_buffer *);

int generic_pipe_buf_steal(struct pipe_inode_info *, struct pipe_buffer *);



/*

 * splice is tied to pipes as a transport (at least for now), so we'll just