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fs: make the pipe_buf_operations ->steal operation optional

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Just return 1 for failure if it is not present.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig
2020-05-20 17:58:14 +02:00
committed by Al Viro
parent 6797d97ab9
commit 76887c2567
4 changed files with 2 additions and 16 deletions
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3
include/linux/pipe_fs_i.h
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@@ -206,6 +206,8 @@ static inline int pipe_buf_confirm(struct pipe_inode_info *pipe,
static inline int pipe_buf_steal(struct pipe_inode_info *pipe,
struct pipe_buffer *buf)
{
if (!buf->ops->steal)
return 1;
return buf->ops->steal(pipe, buf);
}
@@ -232,7 +234,6 @@ void free_pipe_info(struct pipe_inode_info *);
bool generic_pipe_buf_get(struct pipe_inode_info *, struct pipe_buffer *);
int generic_pipe_buf_confirm(struct pipe_inode_info *, struct pipe_buffer *);
int generic_pipe_buf_steal(struct pipe_inode_info *, struct pipe_buffer *);
int generic_pipe_buf_nosteal(struct pipe_inode_info *, struct pipe_buffer *);
void generic_pipe_buf_release(struct pipe_inode_info *, struct pipe_buffer *);
extern const struct pipe_buf_operations nosteal_pipe_buf_ops;