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Revert changes to convert to ->poll_mask() and aio IOCB_CMD_POLL

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The poll() changes were not well thought out, and completely
unexplained.  They also caused a huge performance regression, because
"->poll()" was no longer a trivial file operation that just called down
to the underlying file operations, but instead did at least two indirect
calls.

Indirect calls are sadly slow now with the Spectre mitigation, but the
performance problem could at least be largely mitigated by changing the
"->get_poll_head()" operation to just have a per-file-descriptor pointer
to the poll head instead.  That gets rid of one of the new indirections.

But that doesn't fix the new complexity that is completely unwarranted
for the regular case.  The (undocumented) reason for the poll() changes
was some alleged AIO poll race fixing, but we don't make the common case
slower and more complex for some uncommon special case, so this all
really needs way more explanations and most likely a fundamental
redesign.

[ This revert is a revert of about 30 different commits, not reverted
  individually because that would just be unnecessarily messy  - Linus ]

Cc: Al Viro <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Linus Torvalds 2018-06-28 09:43:44 -07:00
commit a11e1d432b
80 changed files with 301 additions and 450 deletions
Download patch file Download diff file Expand all files Collapse all files

3
net/dccp/dccp.h
View file

@ -316,7 +316,8 @@ int dccp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock,
int flags, int *addr_len);
void dccp_shutdown(struct sock *sk, int how);
int inet_dccp_listen(struct socket *sock, int backlog);
__poll_t dccp_poll_mask(struct socket *sock, __poll_t events);
__poll_t dccp_poll(struct file *file, struct socket *sock,
poll_table *wait);
int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
void dccp_req_err(struct sock *sk, u64 seq);

2
net/dccp/ipv4.c
View file

@ -984,7 +984,7 @@ static const struct proto_ops inet_dccp_ops = {
.accept = inet_accept,
.getname = inet_getname,
/* FIXME: work on tcp_poll to rename it to inet_csk_poll */
.poll_mask = dccp_poll_mask,
.poll = dccp_poll,
.ioctl = inet_ioctl,
/* FIXME: work on inet_listen to rename it to sock_common_listen */
.listen = inet_dccp_listen,

2
net/dccp/ipv6.c
View file

@ -1070,7 +1070,7 @@ static const struct proto_ops inet6_dccp_ops = {
.socketpair = sock_no_socketpair,
.accept = inet_accept,
.getname = inet6_getname,
.poll_mask = dccp_poll_mask,
.poll = dccp_poll,
.ioctl = inet6_ioctl,
.listen = inet_dccp_listen,
.shutdown = inet_shutdown,

13
net/dccp/proto.c
View file

@ -312,11 +312,20 @@ int dccp_disconnect(struct sock *sk, int flags)
EXPORT_SYMBOL_GPL(dccp_disconnect);
__poll_t dccp_poll_mask(struct socket *sock, __poll_t events)
/*
* Wait for a DCCP event.
*
* Note that we don't need to lock the socket, as the upper poll layers
* take care of normal races (between the test and the event) and we don't
* go look at any of the socket buffers directly.
*/
__poll_t dccp_poll(struct file *file, struct socket *sock,
poll_table *wait)
{
__poll_t mask;
struct sock *sk = sock->sk;
sock_poll_wait(file, sk_sleep(sk), wait);
if (sk->sk_state == DCCP_LISTEN)
return inet_csk_listen_poll(sk);
@ -358,7 +367,7 @@ __poll_t dccp_poll_mask(struct socket *sock, __poll_t events)
return mask;
}
EXPORT_SYMBOL_GPL(dccp_poll_mask);
EXPORT_SYMBOL_GPL(dccp_poll);
int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg)
{