diff options
Diffstat (limited to 'include/linux/pipe_fs_i.h')
| -rw-r--r-- | include/linux/pipe_fs_i.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/pipe_fs_i.h b/include/linux/pipe_fs_i.h index c0b6ec6bf65b..18dcca51829e 100644 --- a/include/linux/pipe_fs_i.h +++ b/include/linux/pipe_fs_i.h @@ -229,6 +229,15 @@ static inline bool pipe_buf_try_steal(struct pipe_inode_info *pipe, return buf->ops->try_steal(pipe, buf); } +static inline void pipe_discard_from(struct pipe_inode_info *pipe, + unsigned int old_head) +{ + unsigned int mask = pipe->ring_size - 1; + + while (pipe->head > old_head) + pipe_buf_release(pipe, &pipe->bufs[--pipe->head & mask]); +} + /* 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 |