- 09 May, 2022 8 commits
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Jens Axboe authored
These are mutually exclusive - if you use provided buffers, then you cannot use fixed buffers and vice versa. Move them into the same spot in the io_kiocb, which is also advantageous for provided buffers as they get near the submit side hot cacheline. Signed-off-by:Jens Axboe <axboe@kernel.dk>
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Jens Axboe authored
In preparation for providing another way to select a buffer, move the existing logic into a helper. Signed-off-by: -
Jens Axboe authored
Callers already have room to store the addr and length information, clean it up by having the caller just assign the previously provided data. Signed-off-by: -
Jens Axboe authored
Use a plain array for any group ID that's less than 64, and punt anything beyond that to an xarray. 64 fits in a page even for 4KB page sizes and with the planned additions. This makes the expected group usage faster by avoiding a hash and lookup to find our list, and it uses less memory upfront by not allocating any memory for provided buffers unless it's actually being used. Suggested-by:
Pavel Begunkov <asml.silence@gmail.com> Signed-off-by:
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Jens Axboe authored
The read/write opcodes use it already, but the recv/recvmsg do not. If we switch them over and read and validate this at init time while we're checking if the opcode supports it anyway, then we can do it in one spot and we don't have to pass in a separate group ID for io_buffer_select(). Signed-off-by: -
Jens Axboe authored
There's no point in validity checking buf_index if the request doesn't have REQ_F_BUFFER_SELECT set, as we will never use it for that case. Signed-off-by: -
Jens Axboe authored
After the recent changes, this is direct call to io_buffer_select() anyway. With this change, there are no wrappers left for provided buffer selection. Signed-off-by: -
Jens Axboe authored
There's no point in having callers provide a kbuf, we're just returning the address anyway. Signed-off-by:
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- 05 May, 2022 4 commits
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Jens Axboe authored
It's just a thin wrapper around io_buffer_select(), get rid of it. Signed-off-by: -
Jens Axboe authored
For all of send/sendmsg and recv/recvmsg we have the local 'sr' variable, yet some cases still use req->sr_msg which sr points to. Use 'sr' consistently. Signed-off-by: -
Jens Axboe authored
If IORING_RECVSEND_POLL_FIRST is set for recv/recvmsg or send/sendmsg, then we arm poll first rather than attempt a receive or send upfront. This can be useful if we expect there to be no data (or space) available for the request, as we can then avoid wasting time on the initial issue attempt. Reviewed-by:
Hao Xu <howeyxu@tencent.com> Signed-off-by:
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Jens Axboe authored
Don't punt this check to the op prep handlers, add the support to io_op_defs and we can check them while setting up the request. This reduces the text size by 500 bytes on aarch64, and makes this less fragile by having the check in one spot and needing opcodes to opt in to IOPOLL or ioprio support. Reviewed-by:
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- 30 Apr, 2022 7 commits
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Almog Khaikin authored
The IORING_SQ_NEED_WAKEUP flag is now set using atomic_or() which implies a full barrier on some architectures but it is not required to do so. Use the more appropriate smp_mb__after_atomic() which avoids the extra barrier on those architectures. Signed-off-by:
Almog Khaikin <almogkh@gmail.com> Link: https://lore.kernel.org/r/20220426163403.112692-1-almogkh@gmail.com Fixes: 8018823e6987 ("io_uring: serialize ctx->rings->sq_flags with atomic_or/and") Signed-off-by:
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Jens Axboe authored
If IORING_SETUP_COOP_TASKRUN is set to use cooperative scheduling for running task_work, then IORING_SETUP_TASKRUN_FLAG can be set so the application can tell if task_work is pending in the kernel for this ring. This allows use cases like io_uring_peek_cqe() to still function appropriately, or for the task to know when it would be useful to call io_uring_wait_cqe() to run pending events. Reviewed-by:
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Jens Axboe authored
If this is set, io_uring will never use an IPI to deliver a task_work notification. This can be used in the common case where a single task or thread communicates with the ring, and doesn't rely on io_uring_cqe_peek(). This provides a noticeable win in performance, both from eliminating the IPI itself, but also from avoiding interrupting the submitting task unnecessarily. Reviewed-by:
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Jens Axboe authored
While doing so, switch SQPOLL to TWA_SIGNAL_NO_IPI as well, as that just does a task wakeup and then we can remove the special wakeup we have in task_work_add. Reviewed-by:
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Jens Axboe authored
The only difference between set_notify_signal() and __set_notify_signal() is that the former checks if it needs to deliver an IPI to force a reschedule. As the io-wq workers never leave the kernel, and IPI is never needed, they simply need a wakeup. Reviewed-by:
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Jens Axboe authored
Rather than require ctx->completion_lock for ensuring that we don't clobber the flags, use the atomic bitop helpers instead. This removes the need to grab the completion_lock, in preparation for needing to set or clear sq_flags when we don't know the status of this lock. Reviewed-by:
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Jens Axboe authored
Some use cases don't always need an IPI when sending a TWA_SIGNAL notification. Add TWA_SIGNAL_NO_IPI, which is just like TWA_SIGNAL, except it doesn't send an IPI to the target task. It merely sets TIF_NOTIFY_SIGNAL and wakes up the task. This can be useful in avoiding a forceful transition to the kernel if the task is running in userspace. Depending on the task_work in question, it may be quite fine waiting for the next reschedule or kernel enter anyway, or the use case may even have other mechanisms for hinting to the task that a transition may be useful. This can drive more cooperative scheduling of task_work. Reviewed-by:
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- 25 Apr, 2022 21 commits
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Jens Axboe authored
If IO_URING_SCM_ALL isn't set, as it would not be on 32-bit builds, then we trigger a warning: fs/io_uring.c: In function '__io_sqe_files_unregister': fs/io_uring.c:8992:13: warning: unused variable 'i' [-Wunused-variable] 8992 | int i; | ^ Move the ifdef up to include the 'i' variable declaration. Reported-by:Stephen Rothwell <sfr@canb.auug.org.au> Fixes: 5e45690a ("io_uring: store SCM state in io_fixed_file->file_ptr") Signed-off-by:
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Dylan Yudaken authored
Right now io_uring will not actively inform userspace if a CQE is dropped. This is extremely rare, requiring a CQ ring overflow, as well as a GFP_ATOMIC kmalloc failure. However the consequences could cause for example applications to go into an undefined state, possibly waiting for a CQE that never arrives. Return an error code (EBADR) in these cases. Since this is expected to be incredibly rare, try and avoid as much as possible affecting the hot code paths, and so it only is returned lazily and when there is no other available CQEs. Once the error is returned, reset the error condition assuming the user is either ok with it or will clean up appropriately. Signed-off-by:
Dylan Yudaken <dylany@fb.com> Link: https://lore.kernel.org/r/20220421091345.2115755-6-dylany@fb.comSigned-off-by:
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Dylan Yudaken authored
Prepare to use this bitfield for more flags by using constants instead of magic value 0 Signed-off-by:
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Dylan Yudaken authored
io_uring_enter returns the count submitted preferrably over an error code. In some code paths this check is not required, so reorganise the code so that the check is only done as needed. This is also a prep for returning error codes only in waiting scenarios. Signed-off-by:
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Dylan Yudaken authored
Trace cqe overflows in io_uring. Print ocqe before the check, so if it is NULL it indicates that it has been dropped. Signed-off-by:
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Dylan Yudaken authored
Add trace function for overflowing CQ ring. Signed-off-by:
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Jens Axboe authored
We currently check REQ_F_POLLED before arming async poll for a notification to retry. If it's set, then we don't allow poll and will punt to io-wq instead. This is done to prevent a situation where a buggy driver will repeatedly return that there's space/data available yet we get -EAGAIN. However, if we already transferred data, then it should be safe to rely on poll again. Gate the check on whether or not REQ_F_PARTIAL_IO is also set. Signed-off-by: -
Jens Axboe authored
Like commit 7ba89d2a for recv/recvmsg, support MSG_WAITALL for the send side. If this flag is set and we do a short send, retry for a stream of seqpacket socket. Signed-off-by:
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Jens Axboe authored
Rather than match on a specific key, be it user_data or file, allow canceling any request that we can lookup. Works like IORING_ASYNC_CANCEL_ALL in that it cancels multiple requests, but it doesn't key off user_data or the file. Can't be set with IORING_ASYNC_CANCEL_FD, as that's a key selector. Only one may be used at the time. Signed-off-by:
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Jens Axboe authored
Currently sqe->addr must contain the user_data of the request being canceled. Introduce the IORING_ASYNC_CANCEL_FD flag, which tells the kernel that we're keying off the file fd instead for cancelation. This allows canceling any request that a) uses a file, and b) was assigned the file based on the value being passed in. Signed-off-by:
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Jens Axboe authored
The current cancelation will lookup and cancel the first request it finds based on the key passed in. Add a flag that allows to cancel any request that matches they key. It completes with the number of requests found and canceled, or res < 0 if an error occured. Signed-off-by:
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Jens Axboe authored
In preparation for being able to not only key cancel off the user_data, pass in the io_cancel_data struct for the various functions that deal with request cancelation. Signed-off-by:
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Jens Axboe authored
It's only called from one location, and it always passes in 'false'. Kill the argument, and just pass in 'false' to io_poll_find(). Signed-off-by:
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Pavel Begunkov authored
Split timeout handling into removal + failing, so we can reduce spinlocking time and remove another instance of triple nested locking. Signed-off-by:
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Pavel Begunkov authored
Move ->timeout_lock grabbing inside of io_timeout_cancel(), so we can do io_req_task_queue_fail() outside of the lock. It's much nicer than relying on triple nested locking. Signed-off-by:
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Jens Axboe authored
A previous commit removed SCM accounting for non-unix sockets, as those are the only ones that can cause a fixed file reference. While that is true, it also means we're now dereferencing the file as part of the workqueue driven __io_sqe_files_unregister() after the process has exited. This isn't safe for SCM files, as unix gc may have already reaped them when the process exited. KASAN complains about this: [ 12.307040] Freed by task 0: [ 12.307592] kasan_save_stack+0x28/0x4c [ 12.308318] kasan_set_track+0x28/0x38 [ 12.309049] kasan_set_free_info+0x24/0x44 [ 12.309890] ____kasan_slab_free+0x108/0x11c [ 12.310739] __kasan_slab_free+0x14/0x1c [ 12.311482] slab_free_freelist_hook+0xd4/0x164 [ 12.312382] kmem_cache_free+0x100/0x1dc [ 12.313178] file_free_rcu+0x58/0x74 [ 12.313864] rcu_core+0x59c/0x7c0 [ 12.314675] rcu_core_si+0xc/0x14 [ 12.315496] _stext+0x30c/0x414 [ 12.316287] [ 12.316687] Last potentially related work creation: [ 12.317885] kasan_save_stack+0x28/0x4c [ 12.318845] __kasan_record_aux_stack+0x9c/0xb0 [ 12.319976] kasan_record_aux_stack_noalloc+0x10/0x18 [ 12.321268] call_rcu+0x50/0x35c [ 12.322082] __fput+0x2fc/0x324 [ 12.322873] ____fput+0xc/0x14 [ 12.323644] task_work_run+0xac/0x10c [ 12.324561] do_notify_resume+0x37c/0xe74 [ 12.325420] el0_svc+0x5c/0x68 [ 12.326050] el0t_64_sync_handler+0xb0/0x12c [ 12.326918] el0t_64_sync+0x164/0x168 [ 12.327657] [ 12.327976] Second to last potentially related work creation: [ 12.329134] kasan_save_stack+0x28/0x4c [ 12.329864] __kasan_record_aux_stack+0x9c/0xb0 [ 12.330735] kasan_record_aux_stack+0x10/0x18 [ 12.331576] task_work_add+0x34/0xf0 [ 12.332284] fput_many+0x11c/0x134 [ 12.332960] fput+0x10/0x94 [ 12.333524] __scm_destroy+0x80/0x84 [ 12.334213] unix_destruct_scm+0xc4/0x144 [ 12.334948] skb_release_head_state+0x5c/0x6c [ 12.335696] skb_release_all+0x14/0x38 [ 12.336339] __kfree_skb+0x14/0x28 [ 12.336928] kfree_skb_reason+0xf4/0x108 [ 12.337604] unix_gc+0x1e8/0x42c [ 12.338154] unix_release_sock+0x25c/0x2dc [ 12.338895] unix_release+0x58/0x78 [ 12.339531] __sock_release+0x68/0xec [ 12.340170] sock_close+0x14/0x20 [ 12.340729] __fput+0x18c/0x324 [ 12.341254] ____fput+0xc/0x14 [ 12.341763] task_work_run+0xac/0x10c [ 12.342367] do_notify_resume+0x37c/0xe74 [ 12.343086] el0_svc+0x5c/0x68 [ 12.343510] el0t_64_sync_handler+0xb0/0x12c [ 12.344086] el0t_64_sync+0x164/0x168 We have an extra bit we can use in file_ptr on 64-bit, use that to store whether this file is SCM'ed or not, avoiding the need to look at the file contents itself. This does mean that 32-bit will be stuck with SCM for all registered files, just like 64-bit did before the referenced commit. Fixes: 1f59bc0f ("io_uring: don't scm-account for non af_unix sockets") Signed-off-by:
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Pavel Begunkov authored
The ctx argument of io_req_put_rsrc() is not used, kill it. Signed-off-by:
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Pavel Begunkov authored
Add a simple helper to encapsulating dropping rsrc nodes references, it's cleaner and will help if we'd change rsrc refcounting or play with percpu_ref_put() [no]inlining. Signed-off-by:
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Pavel Begunkov authored
req->fixed_rsrc_refs keeps a pointer to rsrc node pcpu references, but it's more natural just to store rsrc node directly. There were some reasons for that in the past but not anymore. Signed-off-by:
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Pavel Begunkov authored
All io_assign_file() callers do error handling themselves, req_set_fail() in the io_assign_file()'s fail path needlessly bloats the kernel and is not the best abstraction to have. Simplify the error path. Signed-off-by:
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Pavel Begunkov authored
We have io_ring_submit_[un]lock() functions helping us with conditional ->uring_lock locking, use them in io_file_get_fixed() instead of hand coding. Signed-off-by:
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