Граф коммитов

617 Коммитов

Автор SHA1 Сообщение Дата
Jens Axboe 4f6a94d337 net: fix compat pointer in get_compat_msghdr()
A previous change enabled external users to copy the data before
calling __get_compat_msghdr(), but didn't modify get_compat_msghdr() or
__io_compat_recvmsg_copy_hdr() to take that into account. They are both
stil passing in the __user pointer rather than the copied version.

Ensure we pass in the kernel struct, not the pointer to the user data.

Link: https://lore.kernel.org/all/46439555-644d-08a1-7d66-16f8f9a320f0@samsung.com/
Fixes: 1a3e4e94a1b9 ("net: copy from user before calling __get_compat_msghdr")
Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:18 -06:00
Michal Koutný 4890422992 io_uring: Don't require reinitable percpu_ref
The commit 8bb649ee1d ("io_uring: remove ring quiesce for
io_uring_register") removed the worklow relying on reinit/resurrection
of the percpu_ref, hence, initialization with that requested is a relic.

This is based on code review, this causes no real bug (and theoretically
can't). Technically it's a revert of commit 214828962d ("io_uring:
initialize percpu refcounters using PERCU_REF_ALLOW_REINIT") but since
the flag omission is now justified, I'm not making this a revert.

Fixes: 8bb649ee1d ("io_uring: remove ring quiesce for io_uring_register")
Signed-off-by: Michal Koutný <mkoutny@suse.com>
Acked-by: Roman Gushchin <roman.gushchin@linux.dev>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:18 -06:00
Dylan Yudaken 9b0fc3c054 io_uring: fix types in io_recvmsg_multishot_overflow
io_recvmsg_multishot_overflow had incorrect types on non x64 system.
But also it had an unnecessary INT_MAX check, which could just be done
by changing the type of the accumulator to int (also simplifying the
casts).

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Fixes: a8b38c4ce724 ("io_uring: support multishot in recvmsg")
Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220715130252.610639-1-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:18 -06:00
Uros Bizjak 4ccc6db090 io_uring: Use atomic_long_try_cmpxchg in __io_account_mem
Use atomic_long_try_cmpxchg instead of
atomic_long_cmpxchg (*ptr, old, new) == old in __io_account_mem.
x86 CMPXCHG instruction returns success in ZF flag, so this
change saves a compare after cmpxchg (and related move
instruction in front of cmpxchg).

Also, atomic_long_try_cmpxchg implicitly assigns old *ptr value
to "old" when cmpxchg fails, enabling further code simplifications.

No functional change intended.

Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:18 -06:00
Dylan Yudaken 9bb66906f2 io_uring: support multishot in recvmsg
Similar to multishot recv, this will require provided buffers to be
used. However recvmsg is much more complex than recv as it has multiple
outputs. Specifically flags, name, and control messages.

Support this by introducing a new struct io_uring_recvmsg_out with 4
fields. namelen, controllen and flags match the similar out fields in
msghdr from standard recvmsg(2), payloadlen is the length of the payload
following the header.
This struct is placed at the start of the returned buffer. Based on what
the user specifies in struct msghdr, the next bytes of the buffer will be
name (the next msg_namelen bytes), and then control (the next
msg_controllen bytes). The payload will come at the end. The return value
in the CQE is the total used size of the provided buffer.

Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220714110258.1336200-4-dylany@fb.com
[axboe: style fixups, see link]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:18 -06:00
Dylan Yudaken 72c531f8ef net: copy from user before calling __get_compat_msghdr
this is in preparation for multishot receive from io_uring, where it needs
to have access to the original struct user_msghdr.

functionally this should be a no-op.

Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220714110258.1336200-3-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:17 -06:00
Dylan Yudaken 7fa875b8e5 net: copy from user before calling __copy_msghdr
this is in preparation for multishot receive from io_uring, where it needs
to have access to the original struct user_msghdr.

functionally this should be a no-op.

Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220714110258.1336200-2-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:17 -06:00
Dylan Yudaken 6d2f75a0cf io_uring: support 0 length iov in buffer select in compat
Match up work done in "io_uring: allow iov_len = 0 for recvmsg and buffer
select", but for compat code path.

Fixes: a68caad69ce5 ("io_uring: allow iov_len = 0 for recvmsg and buffer select")
Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220708181838.1495428-3-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:17 -06:00
Dylan Yudaken e2df2ccb75 io_uring: fix multishot ending when not polled
If multishot is not actually polling then return IOU_OK rather than the
result.
If the result was > 0 this will confuse things further up the callstack
which expect a return <= 0.

Fixes: 1300ebb20286 ("io_uring: multishot recv")
Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220708181838.1495428-2-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:17 -06:00
Jens Axboe 43e0bbbd0b io_uring: add netmsg cache
For recvmsg/sendmsg, if they don't complete inline, we currently need
to allocate a struct io_async_msghdr for each request. This is a
somewhat large struct.

Hook up sendmsg/recvmsg to use the io_alloc_cache. This reduces the
alloc + free overhead considerably, yielding 4-5% of extra performance
running netbench.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:17 -06:00
Jens Axboe 9731bc9855 io_uring: impose max limit on apoll cache
Caches like this tend to grow to the peak size, and then never get any
smaller. Impose a max limit on the size, to prevent it from growing too
big.

A somewhat randomly chosen 512 is the max size we'll allow the cache
to get. If a batch of frees come in and would bring it over that, we
simply start kfree'ing the surplus.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:17 -06:00
Jens Axboe 9b797a37c4 io_uring: add abstraction around apoll cache
In preparation for adding limits, and one more user, abstract out the
core bits of the allocation+free cache.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:17 -06:00
Jens Axboe 9da7471ed1 io_uring: move apoll cache to poll.c
This is where it's used, move the flush handler in there.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:17 -06:00
Pavel Begunkov e8375e43ca io_uring: consolidate hash_locked io-wq handling
Don't duplicate code disabling REQ_F_HASH_LOCKED for IO_URING_F_UNLOCKED
(i.e. io-wq), move the handling into __io_arm_poll_handler().

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/0ff0ffdfaa65b3d536131535c3dad3c63d9b7bb0.1657203020.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:17 -06:00
Pavel Begunkov b21a51e26e io_uring: clear REQ_F_HASH_LOCKED on hash removal
Instead of clearing REQ_F_HASH_LOCKED while arming a poll, unset the bit
when we're removing the entry from the table in io_poll_tw_hash_eject().

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/02e48bb88d6f1480c94ac2924c43ad1fbd48e92a.1657203020.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:17 -06:00
Pavel Begunkov ceff501790 io_uring: don't race double poll setting REQ_F_ASYNC_DATA
Just as with io_poll_double_prepare() setting REQ_F_DOUBLE_POLL, we can
race with the first poll entry when setting REQ_F_ASYNC_DATA. Move it
under io_poll_double_prepare().

Fixes: a18427bb2d9b ("io_uring: optimise submission side poll_refs")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/df6920f509c11115aa2bce8b34dc5fdb0eb98920.1657203020.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:17 -06:00
Pavel Begunkov 7a121ced6e io_uring: don't miss setting REQ_F_DOUBLE_POLL
When adding a second poll entry we should set REQ_F_DOUBLE_POLL
unconditionally. We might race with the first entry removal but that
doesn't change the rule.

Fixes: a18427bb2d9b ("io_uring: optimise submission side poll_refs")
Reported-and-tested-by: syzbot+49950ba66096b1f0209b@syzkaller.appspotmail.com
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/8b680d83ded07424db83e8745585e7a6d72826ef.1657203020.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:17 -06:00
Dylan Yudaken cf0dd9527e io_uring: disable multishot recvmsg
recvmsg has semantics that do not make it trivial to extend to
multishot. Specifically it has user pointers and returns data in the
original parameter. In order to make this API useful these will need to be
somehow included with the provided buffers.

For now remove multishot for recvmsg as it is not useful.

Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220704140106.200167-1-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:17 -06:00
Dylan Yudaken e0486f3f7c io_uring: only trace one of complete or overflow
In overflow we see a duplcate line in the trace, and in some cases 3
lines (if initial io_post_aux_cqe fails).
Instead just trace once for each CQE

Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220630091231.1456789-13-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:17 -06:00
Dylan Yudaken b3fdea6ecb io_uring: multishot recv
Support multishot receive for io_uring.
Typical server applications will run a loop where for each recv CQE it
requeues another recv/recvmsg.

This can be simplified by using the existing multishot functionality
combined with io_uring's provided buffers.
The API is to add the IORING_RECV_MULTISHOT flag to the SQE. CQEs will
then be posted (with IORING_CQE_F_MORE flag set) when data is available
and is read. Once an error occurs or the socket ends, the multishot will
be removed and a completion without IORING_CQE_F_MORE will be posted.

The benefit to this is that the recv is much more performant.
 * Subsequent receives are queued up straight away without requiring the
   application to finish a processing loop.
 * If there are more data in the socket (sat the provided buffer size is
   smaller than the socket buffer) then the data is immediately
   returned, improving batching.
 * Poll is only armed once and reused, saving CPU cycles

Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220630091231.1456789-11-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:17 -06:00
Dylan Yudaken cbd2574854 io_uring: fix multishot accept ordering
Similar to multishot poll, drop multishot accept when CQE overflow occurs.

Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220630091231.1456789-10-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:17 -06:00
Dylan Yudaken a2da676376 io_uring: fix multishot poll on overflow
On overflow, multishot poll can still complete with the IORING_CQE_F_MORE
flag set.
If in the meantime the user clears a CQE and a the poll was cancelled then
the poll will post a CQE without the IORING_CQE_F_MORE (and likely result
-ECANCELED).

However when processing the application will encounter the non-overflow
CQE which indicates that there will be no more events posted. Typical
userspace applications would free memory associated with the poll in this
case.
It will then subsequently receive the earlier CQE which has overflowed,
which breaks the contract given by the IORING_CQE_F_MORE flag.

Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220630091231.1456789-9-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:17 -06:00
Dylan Yudaken 52120f0fad io_uring: add allow_overflow to io_post_aux_cqe
Some use cases of io_post_aux_cqe would not want to overflow as is, but
might want to change the flags/result. For example multishot receive
requires in order CQE, and so if there is an overflow it would need to
stop receiving until the overflow is taken care of.

Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220630091231.1456789-8-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:17 -06:00
Dylan Yudaken 114eccdf0e io_uring: add IOU_STOP_MULTISHOT return code
For multishot we want a way to signal the caller that multishot has ended
but also this might not be an error return.

For example sockets return 0 when closed, which should end a multishot
recv, but still have a CQE with result 0

Introduce IOU_STOP_MULTISHOT which does this and indicates that the return
code is stored inside req->cqe

Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220630091231.1456789-7-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:17 -06:00
Dylan Yudaken 2ba69707d9 io_uring: clean up io_poll_check_events return values
The values returned are a bit confusing, where 0 and 1 have implied
meaning, so add some definitions for them.

Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220630091231.1456789-6-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:16 -06:00
Dylan Yudaken d4e097dae2 io_uring: recycle buffers on error
Rather than passing an error back to the user with a buffer attached,
recycle the buffer immediately.

Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220630091231.1456789-5-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:16 -06:00
Dylan Yudaken 5702196e7d io_uring: allow iov_len = 0 for recvmsg and buffer select
When using BUFFER_SELECT there is no technical requirement that the user
actually provides iov, and this removes one copy_from_user call.

So allow iov_len to be 0.

Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220630091231.1456789-4-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:16 -06:00
Dylan Yudaken 32f3c434b1 io_uring: restore bgid in io_put_kbuf
Attempt to restore bgid. This is needed when recycling unused buffers as
the next time around it will want the correct bgid.

Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220630091231.1456789-3-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:16 -06:00
Dylan Yudaken b8c015598c io_uring: allow 0 length for buffer select
If user gives 0 for length, we can set it from the available buffer size.

Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220630091231.1456789-2-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:16 -06:00
Pavel Begunkov 6e73dffbb9 io_uring: let to set a range for file slot allocation
From recently io_uring provides an option to allocate a file index for
operation registering fixed files. However, it's utterly unusable with
mixed approaches when for a part of files the userspace knows better
where to place it, as it may race and users don't have any sane way to
pick a slot and hoping it will not be taken.

Let the userspace to register a range of fixed file slots in which the
auto-allocation happens. The use case is splittting the fixed table in
two parts, where on of them is used for auto-allocation and another for
slot-specified operations.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/66ab0394e436f38437cf7c44676e1920d09687ad.1656154403.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:16 -06:00
Jens Axboe e6130eba8a io_uring: add support for passing fixed file descriptors
With IORING_OP_MSG_RING, one ring can send a message to another ring.
Extend that support to also allow sending a fixed file descriptor to
that ring, enabling one ring to pass a registered descriptor to another
one.

Arguments are extended to pass in:

sqe->addr3	fixed file slot in source ring
sqe->file_index	fixed file slot in destination ring

IORING_OP_MSG_RING is extended to take a command argument in sqe->addr.
If set to zero (or IORING_MSG_DATA), it sends just a message like before.
If set to IORING_MSG_SEND_FD, a fixed file descriptor is sent according
to the above arguments.

Two common use cases for this are:

1) Server needs to be shutdown or restarted, pass file descriptors to
   another onei

2) Backend is split, and one accepts connections, while others then get
  the fd passed and handle the actual connection.

Both of those are classic SCM_RIGHTS use cases, and it's not possible to
support them with direct descriptors today.

By default, this will post a CQE to the target ring, similarly to how
IORING_MSG_DATA does it. If IORING_MSG_RING_CQE_SKIP is set, no message
is posted to the target ring. The issuer is expected to notify the
receiver side separately.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:16 -06:00
Jens Axboe f110ed8498 io_uring: split out fixed file installation and removal
Put it with the filetable code, which is where it belongs. While doing
so, have the helpers take a ctx rather than an io_kiocb. It doesn't make
sense to use a request, as it's not an operation on the request itself.
It applies to the ring itself.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:16 -06:00
Pavel Begunkov fbb8bb0291 io_uring: remove ctx->refs pinning on enter
io_uring_enter() takes ctx->refs, which was previously preventing racing
with register quiesce. However, as register now doesn't touch the refs,
we can freely kill extra ctx pinning and rely on the fact that we're
holding a file reference preventing the ring from being destroyed.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/a11c57ad33a1be53541fce90669c1b79cf4d8940.1656153286.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:16 -06:00
Pavel Begunkov 3273c4407a io_uring: don't check file ops of registered rings
Registered rings are per definitions io_uring files, so we don't need to
additionally verify them.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/425cd64fd885b8e329a46c205ee811987691baaf.1656153286.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:16 -06:00
Pavel Begunkov ad8b261d83 io_uring: remove extra TIF_NOTIFY_SIGNAL check
io_run_task_work() accounts for TIF_NOTIFY_SIGNAL, so no need to have an
second check in io_run_task_work_sig().

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/52ce41a592ad904511697f432141e5690fd4b968.1656153285.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:16 -06:00
Pavel Begunkov 3218e5d32d io_uring: fuse fallback_node and normal tw node
Now as both normal and fallback paths use llist, just keep one node head
in struct io_task_work and kill off ->fallback_node.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/d04ebde409f7b162fe247b361b4486b193293e46.1656153285.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:16 -06:00
Pavel Begunkov 37c7bd31b3 io_uring: improve io_fail_links()
io_fail_links() is called with ->completion_lock held and for that
reason we'd want to keep it as small as we can. Instead of doing
__io_req_complete_post() for each linked request under the lock, fail
them in a task_work handler under ->uring_lock.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/a2f68708b970a21f4e84ddfa7b3abd67a8fffb27.1656153285.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:16 -06:00
Jens Axboe fe991a7688 io_uring: move POLLFREE handling to separate function
We really don't care about this at all in terms of performance. Outside
of having it already be marked unlikely(), shove it into a separate
__cold function.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:16 -06:00
Hao Xu 795bbbc8a9 io_uring: kbuf: inline io_kbuf_recycle_ring()
Make io_kbuf_recycle_ring() inline since it is the fast path of
provided buffer.

Signed-off-by: Hao Xu <howeyxu@tencent.com>
Link: https://lore.kernel.org/r/20220623130126.179232-1-hao.xu@linux.dev
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:16 -06:00
Pavel Begunkov 49f1c68e04 io_uring: optimise submission side poll_refs
The final poll_refs put in __io_arm_poll_handler() takes quite some
cycles. When we're arming from the original task context task_work won't
be run, so in this case we can assume that we won't race with task_works
and so not take the initial ownership ref.

One caveat is that after arming a poll we may race with it, so we have
to add a bunch of io_poll_get_ownership() hidden inside of
io_poll_can_finish_inline() whenever we want to complete arming inline.
For the same reason we can't just set REQ_F_DOUBLE_POLL in
__io_queue_proc() and so need to sync with the first poll entry by
taking its wq head lock.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/8825315d7f5e182ac1578a031e546f79b1c97d01.1655990418.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:16 -06:00
Pavel Begunkov de08356f48 io_uring: refactor poll arm error handling
__io_arm_poll_handler() errors parsing is a horror, in case it failed it
returns 0 and the caller is expected to look at ipt.error, which already
led us to a number of problems before.

When it returns a valid mask, leave it as it's not, i.e. return 1 and
store the mask in ipt.result_mask. In case of a failure that can be
handled inline return an error code (negative value), and return 0 if
__io_arm_poll_handler() took ownership of the request and will complete
it.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/018cacdaef5fe95d7dc56b32e85d752cab7607f6.1655990418.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:16 -06:00
Pavel Begunkov 063a007996 io_uring: change arm poll return values
The rules for __io_arm_poll_handler()'s result parsing are complicated,
as the first step don't pass return a mask but pass back a positive
return code and fill ipt->result_mask.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/529e29e9f97f2e6e383ccd44234d8b576a83a921.1655990418.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:16 -06:00
Pavel Begunkov 5204aa8c43 io_uring: add a helper for apoll alloc
Extract a helper function for apoll allocation, makes the code easier to
read.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/2f93282b47dd678e805dd0d7097f66968ced495c.1655990418.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:16 -06:00
Pavel Begunkov 13a99017ff io_uring: remove events caching atavisms
Remove events argument from *io_poll_execute(), it's not needed and not
used.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/12efd4e15c6a90cf9e5b59807cfcb57852b51dc7.1655990418.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:16 -06:00
Pavel Begunkov 0638cd7be2 io_uring: clean poll ->private flagging
We store a req pointer in wqe->private but also take one bit to mark
double poll entries. Replace macro helpers with inline functions for
better type checking and also name the double flag.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/9a61240555c64ac0b7a9b0eb59a9efeb638a35a4.1655990418.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:15 -06:00
Jens Axboe 78a861b949 io_uring: add sync cancelation API through io_uring_register()
The io_uring cancelation API is async, like any other API that we expose
there. For the case of finding a request to cancel, or not finding one,
it is fully sync in that when submission returns, the CQE for both the
cancelation request and the targeted request have been posted to the
CQ ring.

However, if the targeted work is being executed by io-wq, the API can
only start the act of canceling it. This makes it difficult to use in
some circumstances, as the caller then has to wait for the CQEs to come
in and match on the same cancelation data there.

Provide a IORING_REGISTER_SYNC_CANCEL command for io_uring_register()
that does sync cancelations, always. For the io-wq case, it'll wait
for the cancelation to come in before returning. The only expected
returns from this API is:

0		Request found and canceled fine.
> 0		Requests found and canceled. Only happens if asked to
		cancel multiple requests, and if the work wasn't in
		progress.
-ENOENT		Request not found.
-ETIME		A timeout on the operation was requested, but the timeout
		expired before we could cancel.

and we won't get -EALREADY via this API.

If the timeout value passed in is -1 (tv_sec and tv_nsec), then that
means that no timeout is requested. Otherwise, the timespec passed in
is the amount of time the sync cancel will wait for a successful
cancelation.

Link: https://github.com/axboe/liburing/discussions/608
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:15 -06:00
Jens Axboe 7d8ca72501 io_uring: add IORING_ASYNC_CANCEL_FD_FIXED cancel flag
In preparation for not having a request to pass in that carries this
state, add a separate cancelation flag that allows the caller to ask
for a fixed file for cancelation.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:15 -06:00
Jens Axboe 88f52eaad2 io_uring: have cancelation API accept io_uring_task directly
We just use the io_kiocb passed in to find the io_uring_task, and we
already pass in the ctx via cd->ctx anyway.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:15 -06:00
Hao Xu 024b8fde33 io_uring: kbuf: kill __io_kbuf_recycle()
__io_kbuf_recycle() is only called in io_kbuf_recycle(). Kill it and
tweak the code so that the legacy pbuf and ring pbuf code become clear

Signed-off-by: Hao Xu <howeyxu@tencent.com>
Link: https://lore.kernel.org/r/20220622055551.642370-1-hao.xu@linux.dev
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:15 -06:00
Dylan Yudaken c6dd763c24 io_uring: trace task_work_run
trace task_work_run to help provide stats on how often task work is run
and what batch sizes are coming through.

Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220622134028.2013417-9-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:15 -06:00
Dylan Yudaken 3a0c037b0e io_uring: batch task_work
Batching task work up is an important performance optimisation, as
task_work_add is expensive.

In order to keep the semantics replace the task_list with a fake node
while processing the old list, and then do a cmpxchg at the end to see if
there is more work.

Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220622134028.2013417-6-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:15 -06:00
Dylan Yudaken 923d159247 io_uring: introduce llist helpers
Introduce helpers to atomically switch llist.

Will later move this into common code

Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220622134028.2013417-5-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:15 -06:00
Dylan Yudaken f88262e60b io_uring: lockless task list
With networking use cases we see contention on the spinlock used to
protect the task_list when multiple threads try and add completions at once.
Instead we can use a lockless list, and assume that the first caller to
add to the list is responsible for kicking off task work.

Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220622134028.2013417-4-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:15 -06:00
Dylan Yudaken c34398a8c0 io_uring: remove __io_req_task_work_add
this is no longer needed as there is only one caller

Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220622134028.2013417-3-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:15 -06:00
Dylan Yudaken ed5ccb3bee io_uring: remove priority tw list optimisation
This optimisation has some built in assumptions that make it easy to
introduce bugs. It also does not have clear wins that make it worth keeping.

Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220622134028.2013417-2-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:15 -06:00
Pavel Begunkov 024f15e033 io_uring: dedup io_run_task_work
We have an identical copy of io_run_task_work() for io-wq called
io_flush_signals(), deduplicate them.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/a157a4df5fa217b8bd03c73494f2fd0e24e44fbc.1655802465.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:15 -06:00
Pavel Begunkov a6b21fbb4c io_uring: move list helpers to a separate file
It's annoying to have io-wq.h as a dependency every time we want some of
struct io_wq_work_list helpers, move them into a separate file.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/c1d891ce12b30767d1d2a3b7db2ca3abc1ecc4a2.1655802465.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:15 -06:00
Pavel Begunkov 625d38b3fd io_uring: improve io_run_task_work()
Since SQPOLL now uses TWA_SIGNAL_NO_IPI, there won't be task work items
without TIF_NOTIFY_SIGNAL. Simplify io_run_task_work() by removing
task->task_works check. Even though looks it doesn't cause extra cache
bouncing, it's still nice to not touch it an extra time when it might be
not cached.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/75d4f34b0c671075892821a409e28da6cb1d64fe.1655802465.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:15 -06:00
Pavel Begunkov 4a0fef6278 io_uring: optimize io_uring_task layout
task_work bits of io_uring_task are split into two cache lines causing
extra cache bouncing, place them into a separate cache line. Also move
the most used submission path fields closer together, so there are hot.

Cc: stable@vger.kernel.org # 5.15+
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:15 -06:00
Pavel Begunkov bce5d70cd6 io_uring: add a warn_once for poll_find
io_poll_remove() expects poll_find() to search only for poll requests and
passes a flag for this. Just be a little bit extra cautious considering
lots of recent poll/cancellation changes and add a WARN_ON_ONCE checking
that we don't get an apoll'ed request.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/ec9a66f1e22f99dcd02288d4e42f3cc6bb357804.1655684496.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:15 -06:00
Pavel Begunkov 9da070b142 io_uring: consistent naming for inline completion
Improve naming of the inline/deferred completion helper so it's
consistent with it's *_post counterpart. Add some comments and extra
lockdeps to ensure the locking is done right.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/797c619943dac06529e9d3fcb16e4c3cde6ad1a3.1655684496.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:15 -06:00
Pavel Begunkov c059f78584 io_uring: move io_import_fixed()
Move io_import_fixed() into rsrc.c where it belongs.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/4d5becb21f332b4fef6a7cedd6a50e65e2371630.1655684496.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:15 -06:00
Pavel Begunkov f337a84d39 io_uring: opcode independent fixed buf import
Fixed buffers are generic infrastructure, make io_import_fixed() opcode
agnostic.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/b1e765c8a1c2c913a05a28d2399fc53e1d3cf37a.1655684496.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:15 -06:00
Pavel Begunkov 46929b0868 io_uring: add io_commit_cqring_flush()
Since __io_commit_cqring_flush users moved to different files, introduce
io_commit_cqring_flush() helper and encapsulate all flags testing details
inside.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/0da03887435dd9869ffe46dcd3962bf104afcca3.1655684496.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:15 -06:00
Pavel Begunkov 253993210b io_uring: introduce locking helpers for CQE posting
spin_lock(&ctx->completion_lock);
/* post CQEs */
io_commit_cqring(ctx);
spin_unlock(&ctx->completion_lock);
io_cqring_ev_posted(ctx);

We have many places repeating this sequence, and the three function
unlock section is not perfect from the maintainance perspective and also
makes it harder to add new locking/sync trick.

Introduce two helpers. io_cq_lock(), which is simple and only grabs
->completion_lock, and io_cq_unlock_post() encapsulating the three call
section.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/fe0c682bf7f7b55d9be55b0d034be9c1949277dc.1655684496.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:14 -06:00
Pavel Begunkov 305bef9887 io_uring: hide eventfd assumptions in eventfd paths
Some io_uring-eventfd users assume that there won't be spurious wakeups.
That assumption has to be honoured by all io_cqring_ev_posted() callers,
which is inconvenient and from time to time leads to problems but should
be maintained to not break the userspace.

Instead of making the callers track whether a CQE was posted or not, hide
it inside io_eventfd_signal(). It saves ->cached_cq_tail it saw last time
and triggers the eventfd only when ->cached_cq_tail changed since then.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/0ffc66bae37a2513080b601e4370e147faaa72c5.1655684496.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:14 -06:00
Pavel Begunkov b321823a03 io_uring: fix io_poll_remove_all clang warnings
clang complains on bitwise operations with bools, add a bit more
verbosity to better show that we want to call io_poll_remove_all_table()
twice but with different arguments.

Reported-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/f11d21dcdf9233e0eeb15fa13b858a05a78eb310.1655684496.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:14 -06:00
Pavel Begunkov ba3cdb6fbb io_uring: improve task exit timeout cancellations
Don't spin trying to cancel timeouts that are reachable but not
cancellable, e.g. already executing.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/ab8a7440a60bbdf69ae514f672ad050e43dd1b03.1655684496.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:14 -06:00
Pavel Begunkov affa87db90 io_uring: fix multi ctx cancellation
io_uring_try_cancel_requests() loops until there is nothing left to do
with the ring, however there might be several rings and they might have
dependencies between them, e.g. via poll requests.

Instead of cancelling rings one by one, try to cancel them all and only
then loop over if we still potenially some work to do.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/8d491fe02d8ac4c77ff38061cf86b9a827e8845c.1655684496.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:14 -06:00
Pavel Begunkov d9dee4302a io_uring: remove ->flush_cqes optimisation
It's not clear how widely used IOSQE_CQE_SKIP_SUCCESS is, and how often
->flush_cqes flag prevents from completion being flushed. Sometimes it's
high level of concurrency that enables it at least for one CQE, but
sometimes it doesn't save much because nobody waiting on the CQ.

Remove ->flush_cqes flag and the optimisation, it should benefit the
normal use case. Note, that there is no spurious eventfd problem with
that as checks for spuriousness were incorporated into
io_eventfd_signal().

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/692e81eeddccc096f449a7960365fa7b4a18f8e6.1655637157.git.asml.silence@gmail.com
[axboe: remove now dead state->flush_cqes variable]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:14 -06:00
Pavel Begunkov a830ffd287 io_uring: move io_eventfd_signal()
Move io_eventfd_signal() in the sources without any changes and kill its
forward declaration.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/9ebebb3f6f56f5a5448a621e0b6a537720c43334.1655637157.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:14 -06:00
Pavel Begunkov 9046c6415b io_uring: reshuffle io_uring/io_uring.h
It's a good idea to first do forward declarations and then inline
helpers, otherwise there will be keep stumbling on dependencies
between them.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/1d7fa6672ed43f20ccc0c54ae201369ebc3ebfab.1655637157.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:14 -06:00
Pavel Begunkov d142c3ec8d io_uring: remove extra io_commit_cqring()
We don't post events in __io_commit_cqring_flush() anymore but send all
requests to tw, so no need to do io_commit_cqring() there.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/f2481e32375e749be89c42e4804268b608722cef.1655637157.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:14 -06:00
Jens Axboe ad163a7e25 io_uring: move a few private types to local headers
Commit 3a3d47fa9cfd ("io_uring: make io_uring_types.h public") moved
a bunch of io_uring types to a kernel wide header, so we could make
tracing a bit saner rather than pass in a ton of arguments.

However, there are a few types in there that are not really needed to
be system wide. Move the cancel data and mapped buffers back to the
appropriate io_uring local headers.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:14 -06:00
Pavel Begunkov 48863ffd3e io_uring: clean up tracing events
We have lots of trace events accepting an io_uring request and wanting
to print some of its fields like user_data, opcode, flags and so on.
However, as trace points were unaware of io_uring structures, we had to
pass all the fields as arguments. Teach trace/events/io_uring.h about
struct io_kiocb and stop the misery of passing a horde of arguments to
trace helpers.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/40ff72f92798114e56d400f2b003beb6cde6ef53.1655384063.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:14 -06:00
Pavel Begunkov ab1c84d855 io_uring: make io_uring_types.h public
Move io_uring types to linux/include, need them public so tracing can
see the definitions and we can clean trace/events/io_uring.h

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/a15f12e8cb7289b2de0deaddcc7518d98a132d17.1655384063.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:14 -06:00
Pavel Begunkov 27a9d66fec io_uring: kill extra io_uring_types.h includes
io_uring/io_uring.h already includes io_uring_types.h, no need to
include it every time. Kill it in a bunch of places, it prepares us for
following patches.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/94d8c943fbe0ef949981c508ddcee7fc1c18850f.1655384063.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:14 -06:00
Pavel Begunkov b3659a65be io_uring: change ->cqe_cached invariant for CQE32
With IORING_SETUP_CQE32 ->cqe_cached doesn't store a real address but
rather an implicit offset into cqes. Store the real cqe pointer and
increment it accordingly if CQE32.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/1ee1838cba16bed96381a006950b36ba640d998c.1655455613.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:14 -06:00
Pavel Begunkov e8c328c391 io_uring: deduplicate io_get_cqe() calls
Deduplicate calls to io_get_cqe() from __io_fill_cqe_req().

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/4fa077986cc3abab7c59ff4e7c390c783885465f.1655455613.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:14 -06:00
Pavel Begunkov ae5735c69b io_uring: deduplicate __io_fill_cqe_req tracing
Deduplicate two trace_io_uring_complete() calls in __io_fill_cqe_req().

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/277ed85dba5189ab7d932164b314013a0f0b0fdc.1655455613.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:14 -06:00
Pavel Begunkov 68494a65d0 io_uring: introduce io_req_cqe_overflow()
__io_fill_cqe_req() is hot and inlined, we want it to be as small as
possible. Add io_req_cqe_overflow() accepting only a request and doing
all overflow accounting, and replace with it two calls to 6 argument
io_cqring_event_overflow().

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/048b9fbcce56814d77a1a540409c98c3d383edcb.1655455613.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:14 -06:00
Pavel Begunkov faf88dde06 io_uring: don't inline __io_get_cqe()
__io_get_cqe() is not as hot as io_get_cqe(), no need to inline it, it
sheds ~500B from the binary.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/c1ac829198a881b7af8710926f99a3559b9f24c0.1655455613.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:14 -06:00
Pavel Begunkov d245bca637 io_uring: don't expose io_fill_cqe_aux()
Deduplicate some code and add a helper for filling an aux CQE, locking
and notification.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/b7c6557c8f9dc5c4cfb01292116c682a0ff61081.1655455613.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:14 -06:00
Hao Xu f09c8643f0 io_uring: kbuf: add comments for some tricky code
Add comments to explain why it is always under uring lock when
incrementing head in __io_kbuf_recycle. And rectify one comemnt about
kbuf consuming in iowq case.

Signed-off-by: Hao Xu <howeyxu@tencent.com>
Link: https://lore.kernel.org/r/20220617050429.94293-1-hao.xu@linux.dev
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:14 -06:00
Pavel Begunkov 9ca9fb24d5 io_uring: mutex locked poll hashing
Currently we do two extra spin lock/unlock pairs to add a poll/apoll
request to the cancellation hash table and remove it from there.

On the submission side we often already hold ->uring_lock and tw
completion is likely to hold it as well. Add a second cancellation hash
table protected by ->uring_lock. In concerns for latency because of a
need to have the mutex locked on the completion side, use the new table
only in following cases:

1) IORING_SETUP_SINGLE_ISSUER: only one task grabs uring_lock, so there
   is little to no contention and so the main tw hander will almost
   always end up grabbing it before calling callbacks.

2) IORING_SETUP_SQPOLL: same as with single issuer, only one task is
   a major user of ->uring_lock.

3) apoll: we normally grab the lock on the completion side anyway to
   execute the request, so it's free.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/1bbad9c78c454b7b92f100bbf46730a37df7194f.1655371007.git.asml.silence@gmail.com
Reviewed-by: Hao Xu <howeyxu@tencent.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:14 -06:00
Pavel Begunkov 5d7943d99d io_uring: propagate locking state to poll cancel
Poll cancellation will be soon need to grab ->uring_lock inside, pass
the locking state, i.e. issue_flags, inside the cancellation functions.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/b86781d047727c07163443b57551a3fa57c7c5e1.1655371007.git.asml.silence@gmail.com
Reviewed-by: Hao Xu <howeyxu@tencent.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:13 -06:00
Pavel Begunkov e6f89be614 io_uring: introduce a struct for hash table
Instead of passing around a pointer to hash buckets, add a bit of type
safety and wrap it into a structure.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/d65bc3faba537ec2aca9eabf334394936d44bd28.1655371007.git.asml.silence@gmail.com
Reviewed-by: Hao Xu <howeyxu@tencent.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:13 -06:00
Pavel Begunkov a2cdd51932 io_uring: pass hash table into poll_find
In preparation for having multiple cancellation hash tables, pass a
table pointer into io_poll_find() and other poll cancel functions.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/a31c88502463dce09254240fa037352927d7ecc3.1655371007.git.asml.silence@gmail.com
Reviewed-by: Hao Xu <howeyxu@tencent.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:13 -06:00
Pavel Begunkov 97bbdc06a4 io_uring: add IORING_SETUP_SINGLE_ISSUER
Add a new IORING_SETUP_SINGLE_ISSUER flag and the userspace visible part
of it, i.e. put limitations of submitters. Also, don't allow it together
with IOPOLL as we're not going to put it to good use.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/4bcc41ee467fdf04c8aab8baf6ce3ba21858c3d4.1655371007.git.asml.silence@gmail.com
Reviewed-by: Hao Xu <howeyxu@tencent.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:13 -06:00
Pavel Begunkov 0ec6dca223 io_uring: use state completion infra for poll reqs
Use io_req_task_complete() for poll request completions, so it can
utilise state completions and save lots of unnecessary locking.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/ced94cb5a728d8e386c640d052fd3da3f5d6891a.1655371007.git.asml.silence@gmail.com
Reviewed-by: Hao Xu <howeyxu@tencent.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:13 -06:00
Pavel Begunkov 8b1dfd343a io_uring: clean up io_ring_ctx_alloc
Add a variable for the number of hash buckets in io_ring_ctx_alloc(),
makes it more readable.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/993926ed0d614ba9a76b2a85bebae2babcb13983.1655371007.git.asml.silence@gmail.com
Reviewed-by: Hao Xu <howeyxu@tencent.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:13 -06:00
Pavel Begunkov 4a07723fb4 io_uring: limit the number of cancellation buckets
Don't allocate to many hash/cancellation buckets, there might be too
many, clamp it to 8 bits, or 256 * 64B = 16KB. We don't usually have too
many requests, and 256 buckets should be enough, especially since we
do hash search only in the cancellation path.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/b9620c8072ba61a2d50eba894b89bd93a94a9abd.1655371007.git.asml.silence@gmail.com
Reviewed-by: Hao Xu <howeyxu@tencent.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:13 -06:00
Pavel Begunkov 4dfab8abb4 io_uring: clean up io_try_cancel
Get rid of an unnecessary extra goto in io_try_cancel() and simplify the
function.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/48cf5417b43a8386c6c364dba1ad9b4c7382d158.1655371007.git.asml.silence@gmail.com
Reviewed-by: Hao Xu <howeyxu@tencent.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:13 -06:00
Pavel Begunkov 1ab1edb0a1 io_uring: pass poll_find lock back
Instead of using implicit knowledge of what is locked or not after
io_poll_find() and co returns, pass back a pointer to the locked
bucket if any. If set the user must to unlock the spinlock.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/dae1dc5749aa34367812ecf62f82fd3f053aae44.1655371007.git.asml.silence@gmail.com
Reviewed-by: Hao Xu <howeyxu@tencent.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:13 -06:00
Hao Xu 38513c464d io_uring: switch cancel_hash to use per entry spinlock
Add a new io_hash_bucket structure so that each bucket in cancel_hash
has separate spinlock. Use per entry lock for cancel_hash, this removes
some completion lock invocation and remove contension between different
cancel_hash entries.

Signed-off-by: Hao Xu <howeyxu@tencent.com>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/05d1e135b0c8bce9d1441e6346776589e5783e26.1655371007.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:13 -06:00
Hao Xu 3654ab0c51 io_uring: poll: remove unnecessary req->ref set
We now don't need to set req->refcount for poll requests since the
reworked poll code ensures no request release race.

Signed-off-by: Hao Xu <howeyxu@tencent.com>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/ec6fee45705890bdb968b0c175519242753c0215.1655371007.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:13 -06:00
Pavel Begunkov 53ccf69bda io_uring: don't inline io_put_kbuf
io_put_kbuf() is huge, don't bloat the kernel with inlining.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/2e21ccf0be471ffa654032914b9430813cae53f8.1655371007.git.asml.silence@gmail.com
Reviewed-by: Hao Xu <howeyxu@tencent.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:13 -06:00
Pavel Begunkov 7012c81593 io_uring: refactor io_req_task_complete()
Clean up io_req_task_complete() and deduplicate io_put_kbuf() calls.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/ae3148ac7eb5cce3e06895cde306e9e959d6f6ae.1655371007.git.asml.silence@gmail.com
Reviewed-by: Hao Xu <howeyxu@tencent.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:13 -06:00
Pavel Begunkov 75d7b3aec1 io_uring: kill REQ_F_COMPLETE_INLINE
REQ_F_COMPLETE_INLINE is only needed to delay queueing into the
completion list to io_queue_sqe() as __io_req_complete() is inlined and
we don't want to bloat the kernel.

As now we complete in a more centralised fashion in io_issue_sqe() we
can get rid of the flag and queue to the list directly.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/600ba20a9338b8a39b249b23d3d177803613dde4.1655371007.git.asml.silence@gmail.com
Reviewed-by: Hao Xu <howeyxu@tencent.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:13 -06:00
Pavel Begunkov df9830d883 io_uring: rw: delegate sync completions to core io_uring
io_issue_sqe() from the io_uring core knows how to complete requests
based on the returned error code, we can delegate io_read()/io_write()
completion to it. Make kiocb_done() to return the right completion
code and propagate it.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/32ef005b45d23bf6b5e6837740dc0331bb051bd4.1655371007.git.asml.silence@gmail.com
Reviewed-by: Hao Xu <howeyxu@tencent.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:13 -06:00
Jens Axboe bb8f870031 io_uring: remove unused IO_REQ_CACHE_SIZE defined
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:13 -06:00
Pavel Begunkov c65f5279ba io_uring: don't set REQ_F_COMPLETE_INLINE in tw
io_req_task_complete() enqueues requests for state completion itself, no
need for REQ_F_COMPLETE_INLINE, which is only serve the purpose of not
bloating the kernel.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/aca80f71464ad02c06f1311d998a2d6ee0b31573.1655310733.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:13 -06:00
Pavel Begunkov 3a08576b96 io_uring: remove check_cq checking from hot paths
All ctx->check_cq events are slow path, don't test every single flag one
by one in the hot path, but add a common guarding if.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/dff026585cea7ff3a172a7c83894a3b0111bbf6a.1655310733.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:13 -06:00
Pavel Begunkov aeaa72c694 io_uring: never defer-complete multi-apoll
Luckily, nnobody completes multi-apoll requests outside the polling
functions, but don't set IO_URING_F_COMPLETE_DEFER in any case as
there is nobody who is catching REQ_F_COMPLETE_INLINE, and so will leak
requests if used.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/a65ed3f5effd9321ee06e6edea294a03be3e15a0.1655310733.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:13 -06:00
Pavel Begunkov 6a02e4be81 io_uring: inline ->registered_rings
There can be only 16 registered rings, no need to allocate an array for
them separately but store it in tctx.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/495f0b953c87994dd9e13de2134019054fa5830d.1655310733.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:13 -06:00
Pavel Begunkov 48c13d8980 io_uring: explain io_wq_work::cancel_seq placement
Add a comment on why we keep ->cancel_seq in struct io_wq_work instead
of struct io_kiocb despite it needed only by io_uring but not io-wq.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/988e87eec9dc700b5dae933df3aefef303502f6c.1655310733.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:13 -06:00
Pavel Begunkov aa1e90f64e io_uring: move small helpers to headers
There is a bunch of inline helpers that will be useful not only to the
core of io_uring, move them to headers.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/22df99c83723e44cba7e945e8519e64e3642c064.1655310733.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:13 -06:00
Pavel Begunkov 22eb2a3fde io_uring: refactor ctx slow data placement
Shove all slow path data at the end of ctx and get rid of extra
indention.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/bcaf200298dd469af20787650550efc66d89bef2.1655310733.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:12 -06:00
Pavel Begunkov aff5b2df9e io_uring: better caching for ctx timeout fields
Following timeout fields access patterns, move all of them into a
separate cache line inside ctx, so they don't intervene with normal
completion caching, especially since timeout removals and completion
are separated and the later is done via tw.

It also sheds some bytes from io_ring_ctx, 1216B -> 1152B

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/4b163793072840de53b3cb66e0c2995e7226ff78.1655310733.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:12 -06:00
Pavel Begunkov b25436038f io_uring: move defer_list to slow data
draining is slow path, move defer_list to the end where slow data lives
inside the context.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/e16379391ca72b490afdd24e8944baab849b4a7b.1655310733.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:12 -06:00
Pavel Begunkov 5ff4fdffad io_uring: make reg buf init consistent
The default (i.e. empty) state of register buffer is dummy_ubuf, so set
it to dummy on init instead of NULL.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/c5456aecf03d9627fbd6e65e100e2b5293a6151e.1655310733.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:12 -06:00
Jens Axboe 61a2732af4 io_uring: deprecate epoll_ctl support
As far as we know, nobody ever adopted the epoll_ctl management via
io_uring. Deprecate it now with a warning, and plan on removing it in
a later kernel version. When we do remove it, we can revert the following
commits as well:

39220e8d4a ("eventpoll: support non-blocking do_epoll_ctl() calls")
58e41a44c4 ("eventpoll: abstract out epoll_ctl() handler")

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/io-uring/CAHk-=wiTyisXBgKnVHAGYCNvkmjk=50agS2Uk6nr+n3ssLZg2w@mail.gmail.com/
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:12 -06:00
Jens Axboe b9ba8a4463 io_uring: add support for level triggered poll
By default, the POLL_ADD command does edge triggered poll - if we get
a non-zero mask on the initial poll attempt, we complete the request
successfully.

Support level triggered by always waiting for a notification, regardless
of whether or not the initial mask matches the file state.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:12 -06:00
Jens Axboe d9b57aa3cf io_uring: move opcode table to opdef.c
We already have the declarations in opdef.h, move the rest into its own
file rather than in the main io_uring.c file.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:12 -06:00
Jens Axboe f3b44f92e5 io_uring: move read/write related opcodes to its own file
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:12 -06:00
Jens Axboe c98817e6cd io_uring: move remaining file table manipulation to filetable.c
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:12 -06:00
Jens Axboe 7357298448 io_uring: move rsrc related data, core, and commands
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:12 -06:00
Jens Axboe 3b77495a97 io_uring: split provided buffers handling into its own file
Move both the opcodes related to it, and the internals code dealing with
it.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:12 -06:00
Jens Axboe 7aaff708a7 io_uring: move cancelation into its own file
This also helps cleanup the io_uring.h cancel parts, as we can make
things static in the cancel.c file, mostly.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:12 -06:00
Jens Axboe 329061d3e2 io_uring: move poll handling into its own file
Add a io_poll_issue() rather than export the general task_work locking
and io_issue_sqe(), and put the io_op_defs definition and structure into
a separate header file so that poll can use it.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:12 -06:00
Jens Axboe cfd22e6b33 io_uring: add opcode name to io_op_defs
This kills the last per-op switch.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:12 -06:00
Jens Axboe 92ac8beaea io_uring: include and forward-declaration sanitation
Remove some dead headers we no longer need, and get rid of the
io_ring_ctx and io_uring_fops forward declarations.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:12 -06:00
Jens Axboe c9f06aa7de io_uring: move io_uring_task (tctx) helpers into its own file
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:12 -06:00
Jens Axboe a4ad4f748e io_uring: move fdinfo helpers to its own file
This also means moving a bit more of the fixed file handling to the
filetable side, which makes sense separately too.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:12 -06:00
Jens Axboe e5550a1447 io_uring: use io_is_uring_fops() consistently
Convert the last spots that check for io_uring_fops to use the provided
helper instead.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:12 -06:00
Jens Axboe 17437f3114 io_uring: move SQPOLL related handling into its own file
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:12 -06:00
Jens Axboe 59915143e8 io_uring: move timeout opcodes and handling into its own file
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:12 -06:00
Jens Axboe e418bbc97b io_uring: move our reference counting into a header
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:12 -06:00
Jens Axboe 36404b09aa io_uring: move msg_ring into its own file
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:12 -06:00
Jens Axboe f9ead18c10 io_uring: split network related opcodes into its own file
While at it, convert the handlers to just use io_eopnotsupp_prep()
if CONFIG_NET isn't set.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:11 -06:00
Jens Axboe e0da14def1 io_uring: move statx handling to its own file
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:11 -06:00
Jens Axboe a9c210cebe io_uring: move epoll handler to its own file
Would be nice to sort out Kconfig for this and don't even compile
epoll.c if we don't have epoll configured.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:11 -06:00
Jens Axboe 4cf9049528 io_uring: add a dummy -EOPNOTSUPP prep handler
Add it and use it for the epoll handling, if epoll isn't configured.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:11 -06:00
Jens Axboe 99f15d8d61 io_uring: move uring_cmd handling to its own file
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:11 -06:00
Jens Axboe cd40cae29e io_uring: split out open/close operations
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:11 -06:00
Jens Axboe 453b329be5 io_uring: separate out file table handling code
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:11 -06:00
Jens Axboe f4c163dd7d io_uring: split out fadvise/madvise operations
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:11 -06:00
Jens Axboe 0d58472740 io_uring: split out fs related sync/fallocate functions
This splits out sync_file_range, fsync, and fallocate.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:11 -06:00
Jens Axboe 531113bbd5 io_uring: split out splice related operations
This splits out splice and tee support.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:11 -06:00
Jens Axboe 11aeb71406 io_uring: split out filesystem related operations
This splits out renameat, unlinkat, mkdirat, symlinkat, and linkat.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:11 -06:00
Jens Axboe e28683bdfc io_uring: move nop into its own file
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:11 -06:00
Jens Axboe 5e2a18d93f io_uring: move xattr related opcodes to its own file
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:11 -06:00
Jens Axboe 97b388d70b io_uring: handle completions in the core
Normally request handlers complete requests themselves, if they don't
return an error. For the latter case, the core will complete it for
them.

This is unhandy for pushing opcode handlers further out, as we don't
want a bunch of inline completion code and we don't want to make the
completion path slower than it is now.

Let the core handle any completion, unless the handler explicitly
asks us not to.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:11 -06:00
Jens Axboe de23077eda io_uring: set completion results upfront
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:11 -06:00
Jens Axboe e27f928ee1 io_uring: add io_uring_types.h
This adds definitions of structs that both the core and the various
opcode handlers need to know about.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:11 -06:00
Jens Axboe 4d4c9cff4f io_uring: define a request type cleanup handler
This can move request type specific cleanup into a private handler,
removing the need for the core io_uring parts to know what types
they are dealing with.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:11 -06:00
Jens Axboe 890968dc03 io_uring: unify struct io_symlink and io_hardlink
They are really just a subset of each other, just use the one type.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:11 -06:00
Jens Axboe 9a3a11f977 io_uring: convert iouring_cmd to io_cmd_type
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:11 -06:00
Jens Axboe ceb452e1b4 io_uring: convert xattr to use io_cmd_type
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:11 -06:00
Jens Axboe ea5af87d29 io_uring: convert rsrc_update to io_cmd_type
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:11 -06:00
Jens Axboe c1ee559501 io_uring: convert msg and nop to io_cmd_type
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:10 -06:00
Jens Axboe 2511d3030c io_uring: convert splice to use io_cmd_type
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:10 -06:00
Jens Axboe 3e93a3571a io_uring: convert epoll to io_cmd_type
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:10 -06:00
Jens Axboe bb040a21fd io_uring: convert file system request types to use io_cmd_type
This converts statx, rename, unlink, mkdir, symlink, and hardlink to
use io_cmd_type.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:10 -06:00
Jens Axboe 37d4842f11 io_uring: convert madvise/fadvise to use io_cmd_type
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:10 -06:00
Jens Axboe dd752582e3 io_uring: convert open/close path to use io_cmd_type
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:10 -06:00
Jens Axboe a43714ace5 io_uring: convert timeout path to use io_cmd_type
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:10 -06:00
Jens Axboe f38987f09a io_uring: convert cancel path to use io_cmd_type
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:10 -06:00
Jens Axboe e4a71006ea io_uring: convert the sync and fallocate paths to use io_cmd_type
They all share the same struct io_sync, convert them to use the
io_cmd_type approach instead.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:10 -06:00
Jens Axboe 8ff86d85b7 io_uring: convert net related opcodes to use io_cmd_type
This converts accept, connect, send/recv, sendmsg/recvmsg, shutdown, and
socket to use io_cmd_type.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:10 -06:00
Jens Axboe bd8587e499 io_uring: remove recvmsg knowledge from io_arm_poll_handler()
There's a special case for recvmsg with MSG_ERRQUEUE set. This is
problematic as it means the core needs to know about this special
request type.

For now, just add a generic flag for it.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:10 -06:00
Jens Axboe c24b154967 io_uring: convert poll_update path to use io_cmd_type
Remove struct io_poll_update from io_kiocb, and convert the poll path to
use the io_cmd_type approach instead.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:10 -06:00
Jens Axboe 8d4388d116 io_uring: convert poll path to use io_cmd_type
Remove struct io_poll_iocb from io_kiocb, and convert the poll path to
use the io_cmd_type approach instead.

While at it, rename io_poll_iocb to io_poll which is consistent with the
other request type private structures.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:10 -06:00
Jens Axboe 3c306fb2f9 io_uring: convert read/write path to use io_cmd_type
Remove struct io_rw from io_kiocb, and convert the read/write path to
use the io_cmd_type approach instead.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:10 -06:00
Jens Axboe f49eca2156 io_uring: add generic command payload type to struct io_kiocb
Each opcode generally has a command structure in io_kiocb which it can
use to store data associated with that request.

In preparation for having the core layer not know about what's inside
these fields, add a generic io_cmd_data type and put in the union as
well.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:10 -06:00
Jens Axboe dc919caff6 io_uring: move req async preparation into opcode handler
Define an io_op_def->prep_async() handler and push the async preparation
to there. Since we now have that, we can drop ->needs_async_setup, as
they mean the same thing.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:10 -06:00
Jens Axboe ed29b0b4fd io_uring: move to separate directory
In preparation for splitting io_uring up a bit, move it into its own
top level directory. It didn't really belong in fs/ anyway, as it's
not a file system only API.

This adds io_uring/ and moves the core files in there, and updates the
MAINTAINERS file for the new location.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-07-24 18:39:10 -06:00