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pipe: add pipe_buf_confirm() helper

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Signed-off-by: Miklos Szeredi <[email protected]>
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Miklos Szeredi 2016-09-27 10:45:12 +02:00 • committed by Al Viro
commit fba597db42
4 changed files with 18 additions and 10 deletions
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8
fs/pipe.c
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@ -267,7 +267,6 @@ pipe_read(struct kiocb *iocb, struct iov_iter *to)
if (bufs) {
int curbuf = pipe->curbuf;
struct pipe_buffer *buf = pipe->bufs + curbuf;
const struct pipe_buf_operations *ops = buf->ops;
size_t chars = buf->len;
size_t written;
int error;
@ -275,7 +274,7 @@ pipe_read(struct kiocb *iocb, struct iov_iter *to)
if (chars > total_len)
chars = total_len;
error = ops->confirm(pipe, buf);
error = pipe_buf_confirm(pipe, buf);
if (error) {
if (!ret)
ret = error;
@ -382,11 +381,10 @@ pipe_write(struct kiocb *iocb, struct iov_iter *from)
int lastbuf = (pipe->curbuf + pipe->nrbufs - 1) &
(pipe->buffers - 1);
struct pipe_buffer *buf = pipe->bufs + lastbuf;
const struct pipe_buf_operations *ops = buf->ops;
int offset = buf->offset + buf->len;
if (ops->can_merge && offset + chars <= PAGE_SIZE) {
ret = ops->confirm(pipe, buf);
if (buf->ops->can_merge && offset + chars <= PAGE_SIZE) {
ret = pipe_buf_confirm(pipe, buf);
if (ret)
goto out;