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[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: Jens Axboe <axboe@suse.de>
hifive-unleashed-5.1
Jens Axboe 2006-05-02 15:29:57 +02:00
parent a893b99be7
commit 330ab71619
3 changed files with 5 additions and 4 deletions
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6
fs/pipe.c
View File

@ -184,8 +184,8 @@ void generic_pipe_buf_unmap(struct pipe_inode_info *pipe,
kunmap(buf->page);
}
static int anon_pipe_buf_steal(struct pipe_inode_info *pipe,
struct pipe_buffer *buf)
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,
};

2
fs/splice.c
View File

@ -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 = {

1
include/linux/pipe_fs_i.h
View File

@ -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