- 16 Apr, 2021 2 commits
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Jens Axboe authored
We have this in two spots right now, which is a bit fragile. In preparation for moving REQ_F_POLLED cleanup into the same spot, move the check into a separate helper so we only have it once. Signed-off-by:Jens Axboe <axboe@kernel.dk>
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Jens Axboe authored
The re-add handling isn't correct for the multi wait case, so let's just disable it for now explicitly until we can get that sorted out. This just turns it into a one-shot request. Since we pass back whether or not a poll request terminates in multishot mode on completion, this should not break properly behaving applications that check for IORING_CQE_F_MORE on completion. Signed-off-by:
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- 14 Apr, 2021 4 commits
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Pavel Begunkov authored
Having poll update function as a part of IORING_OP_POLL_ADD is not great, we have to do hack around struct layouts and add some overhead in the way of more popular POLL_ADD. Even more serious drawback is that POLL_ADD requires file and always grabs it, and so poll update, which doesn't need it. Incorporate poll update into IORING_OP_POLL_REMOVE instead of IORING_OP_POLL_ADD. It also more consistent with timeout remove/update. Fixes: b69de288 ("io_uring: allow events and user_data update of running poll requests") Signed-off-by:
Pavel Begunkov <asml.silence@gmail.com> Signed-off-by:
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Pavel Begunkov authored
Isolate poll mask SQE parsing and preparations into a new function, which will be reused shortly. Fixes: b69de288 ("io_uring: allow events and user_data update of running poll requests") Signed-off-by:
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Pavel Begunkov authored
Don't allow REQ_OP_POLL_REMOVE to kill apoll requests, users should not know about it. Also, remove weird -EACCESS in io_poll_update(), it shouldn't know anything about apoll, and have to work even if happened to have a poll and an async poll'ed request with same user_data. Fixes: b69de288 ("io_uring: allow events and user_data update of running poll requests") Signed-off-by:
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Pavel Begunkov authored
Don't reinit io_ring_exit_work()'s exit work/completions on each iteration, that's wasteful. Also add list_rotate_left(), so if we failed to complete the task job, we don't try it again and again but defer it until others are processed. Signed-off-by:
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- 13 Apr, 2021 9 commits
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Pavel Begunkov authored
io_iopoll_getevents() is of no use to us anymore, io_iopoll_check() handles all the cases. Signed-off-by:
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Pavel Begunkov authored
The only way to get out of io_iopoll_getevents() and continue iterating is to have empty iopoll_list, otherwise the main loop would just exit. So, instead of the unlock on 8th time heuristic, do that based on iopoll_list. Also, as no one can add new requests to iopoll_list while io_iopoll_check() hold uring_lock, it's useless to spin with the list empty, return in that case. Signed-off-by:
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Pavel Begunkov authored
As CQE overflows are now untied from requests and so don't hold any ref, we don't need to handle exiting/exec'ing cases there anymore. Moreover, it's much nicer in regards to userspace to save overflowed CQEs whenever possible, so remove failing on in_idle. Signed-off-by:
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Pavel Begunkov authored
Move some parts of io_poll_remove_waitqs() that are opcode independent. Looks better and stresses that both do __io_poll_remove_one(). Signed-off-by:
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Pavel Begunkov authored
Don't save return values of hrtimer_try_to_cancel() in a variable, but use right away. It's in general safer to not have an intermediate variable, which may be reused and passed out wrongly, but it be contracted out. Also clean io_timeout_extract(). Signed-off-by:
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Pavel Begunkov authored
Add one more sparse locking annotation for readability in io_kill_timeout(). Signed-off-by:
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Pavel Begunkov authored
struct io_poll_iocb became pretty nasty combining also update fields. Split them, so we would have more clarity to it. Signed-off-by:
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Pavel Begunkov authored
Both IORING_POLL_UPDATE_EVENTS and IORING_POLL_UPDATE_USER_DATA need old_user_data to find/cancel a poll request, but it's set only for the first one. Signed-off-by:
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Pavel Begunkov authored
If io_sqe_files_unregister() faults on io_rsrc_ref_quiesce(), it will fail to do unregister leaving files referenced. And that may well happen because of a strayed signal or just because it does allocations inside. In io_ring_ctx_free() do an unsafe version of unregister, as it's guaranteed to not have requests by that point and so quiesce is useless. Cc: stable@vger.kernel.org Signed-off-by:
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- 12 Apr, 2021 25 commits
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Pavel Begunkov authored
Revert of revert of "io_uring: wait potential ->release() on resurrect", which adds a helper for resurrect not racing completion reinit, as was removed because of a strange bug with no clear root or link to the patch. Was improved, instead of rcu_synchronize(), just wait_for_completion() because we're at 0 refs and it will happen very shortly. Specifically use non-interruptible version to ignore all pending signals that may have ended prior interruptible wait. This reverts commit cb5e1b81. Signed-off-by:
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Pavel Begunkov authored
req_set_fail_links() condition checking is bulky. Even though it's always in a slow path, it's inlined and generates lots of extra code, simplify it be moving HARDLINK checking into helpers killing linked requests. text data bss dec hex filename before: 79318 12330 8 91656 16608 ./fs/io_uring.o after: 79126 12330 8 91464 16548 ./fs/io_uring.o Signed-off-by: -
Pavel Begunkov authored
Set IO_SQ_THREAD_SHOULD_STOP before taking sqd lock, so the sqpoll task sees earlier. Not a problem, it will stop eventually. Also check invariant that it's stopped only once. Signed-off-by:
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Pavel Begunkov authored
We don't need to store file tables in rsrc nodes, for now it's easier to handle tables not generically, so move file tables into the context. A nice side effect is having one less pointer dereference for request with fixed file initialisation. Signed-off-by:
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Pavel Begunkov authored
In preparation for more changes do a little cleanup of io_sqe_buffers_register(). Move all args/invariant checking into it from io_buffers_map_alloc(), because it's confusing. And add a bit more cleaning for the loop. Signed-off-by:
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Pavel Begunkov authored
Add a helper for unmapping registered buffers, better than double indexing and will be reused in the future. Suggested-by:
Bijan Mottahedeh <bijan.mottahedeh@oracle.com> Signed-off-by:
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Pavel Begunkov authored
We don't take many references of struct io_rsrc_data, only one per each io_rsrc_node, so using percpu refs is overkill. Use atomic ref instead, which is much simpler. Signed-off-by:
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Jens Axboe authored
Randy reports the following error on CONFIG_BLOCK not being set: ../fs/io_uring.c: In function ‘kiocb_done’: ../fs/io_uring.c:2766:7: error: implicit declaration of function ‘io_resubmit_prep’; did you mean ‘io_put_req’? [-Werror=implicit-function-declaration] if (io_resubmit_prep(req)) { Provide a dummy stub for io_resubmit_prep() like we do for io_rw_should_reissue(), which also helps remove an ifdef sequence from io_complete_rw_iopoll() as well. Fixes: 8c130827 ("io_uring: don't alter iopoll reissue fail ret code") Reported-by:Randy Dunlap <rdunlap@infradead.org> Signed-off-by:
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Pavel Begunkov authored
There are three cases where we much care about performance of io_cqring_fill_event() -- flushing inline completions, iopoll and io_req_complete_post(). Inline a hot part of fill_event() into them. All others are not as important and we don't want to bloat binary for them, so add a noinline version of the function for all other use use cases. nops test(batch=32): 16.932 vs 17.822 KIOPS Signed-off-by:
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Pavel Begunkov authored
A simple preparation patch inlining io_cqring_fill_event(), which only role was to pass cflags=0 into an actual fill event. It helps to keep number of related helpers sane in following patches. Signed-off-by:
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Pavel Begunkov authored
Eventfd is not the canonical way of using io_uring, annotate io_should_trigger_evfd() with likely so it improves code generation for non-eventfd branch. Signed-off-by:
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Pavel Begunkov authored
Add an entry for user pointer to compat_msghdr into io_connect, so it's explicit that we may use it as this, and removes annoying casts. Signed-off-by:
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Pavel Begunkov authored
Take advantage of delayed/inline completion flushing and pass right issue flags for completion of open, open2, fadvise and poll remove opcodes. All others either already use it or always punted and never executed inline. Signed-off-by:
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Pavel Begunkov authored
A small refactoring shrinking it and making easier to read. Signed-off-by:
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Pavel Begunkov authored
Now __io_uring_cancel() and __io_uring_files_cancel() are very similar and mostly differ by how we count requests, merge them and allow tctx_inflight() to handle counting. Signed-off-by:
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Pavel Begunkov authored
Instead of keeping requests in a inflight_list, just track them with a per tctx atomic counter. Apart from it being much easier and more consistent with task cancel, it frees ->inflight_entry from being shared between iopoll and cancel-track, so less headache for us. Signed-off-by:
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Pavel Begunkov authored
Move tracked inflight number check up the stack into __io_uring_files_cancel() so it's similar to task cancel. Will be used for further cleaning. Signed-off-by:
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Pavel Begunkov authored
hash_del() works well with non-hashed nodes, there's no need to check if it is hashed first. Signed-off-by:
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Pavel Begunkov authored
Remove error parameter from io_poll_complete(), 0 is always passed, and do a bit of cleaning on top. Signed-off-by:
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Pavel Begunkov authored
io_poll_complete() always fills an event (even an overflowed one), so we always should do io_cqring_ev_posted() afterwards. And that's what is currently happening, because second EPOLLONESHOT check is always true, it can't return !done for oneshots. Remove those branching, it's much easier to read. Signed-off-by:
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Peter Zijlstra authored
Do not include private headers and do not frob in internals. On top of that, while the previous code restores the affinity, it doesn't ensure the task actually moves there if it was running, leading to the fun situation that it can be observed running outside of its allowed mask for potentially significant time. Use the proper API instead. Signed-off-by:
Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/r/YG7QkiUzlEbW85TU@hirez.programming.kicks-ass.netSigned-off-by:
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Jens Axboe authored
We currently allow racy updates to multishot requests, but we can end up double adding the poll request if both completion and update does it. Ensure that we skip re-add on the update side if someone else is completing it. Fixes: b69de288 ("io_uring: allow events and user_data update of running poll requests") Reported-by:
Joakim Hassila <joj@mac.com> Signed-off-by:
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Hao Xu authored
Leverage XOR to simplify the code in __io_worker_busy. Signed-off-by:
Hao Xu <haoxu@linux.alibaba.com> Link: https://lore.kernel.org/r/1617678525-3129-1-git-send-email-haoxu@linux.alibaba.comSigned-off-by:
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Pavel Begunkov authored
The splice/tee comment in io_prep_async_work() isn't relevant since the section was moved, delete it. Signed-off-by:
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Pavel Begunkov authored
Add struct io_fixed_file representing a single registered file, first to hide ugly struct file **, which may be misleading, and secondly to retype it to unsigned long as conversions to it and back to file * for handling and masking FFS_* flags are getting nasty. Signed-off-by:
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