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// SPDX-License-Identifier: GPL-2.0
/*
* io_uring opcode handling table
*/
# include <linux/kernel.h>
# include <linux/errno.h>
# include <linux/fs.h>
# include <linux/file.h>
# include <linux/io_uring.h>
# include "io_uring.h"
# include "opdef.h"
# include "refs.h"
# include "tctx.h"
# include "sqpoll.h"
# include "fdinfo.h"
# include "kbuf.h"
# include "rsrc.h"
# include "xattr.h"
# include "nop.h"
# include "fs.h"
# include "splice.h"
# include "sync.h"
# include "advise.h"
# include "openclose.h"
# include "uring_cmd.h"
# include "epoll.h"
# include "statx.h"
# include "net.h"
# include "msg_ring.h"
# include "timeout.h"
# include "poll.h"
# include "cancel.h"
# include "rw.h"
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# include "waitid.h"
io_uring: add support for futex wake and wait
Add support for FUTEX_WAKE/WAIT primitives.
IORING_OP_FUTEX_WAKE is mix of FUTEX_WAKE and FUTEX_WAKE_BITSET, as
it does support passing in a bitset.
Similary, IORING_OP_FUTEX_WAIT is a mix of FUTEX_WAIT and
FUTEX_WAIT_BITSET.
For both of them, they are using the futex2 interface.
FUTEX_WAKE is straight forward, as those can always be done directly from
the io_uring submission without needing async handling. For FUTEX_WAIT,
things are a bit more complicated. If the futex isn't ready, then we
rely on a callback via futex_queue->wake() when someone wakes up the
futex. From that calback, we queue up task_work with the original task,
which will post a CQE and wake it, if necessary.
Cancelations are supported, both from the application point-of-view,
but also to be able to cancel pending waits if the ring exits before
all events have occurred. The return value of futex_unqueue() is used
to gate who wins the potential race between cancelation and futex
wakeups. Whomever gets a 'ret == 1' return from that claims ownership
of the io_uring futex request.
This is just the barebones wait/wake support. PI or REQUEUE support is
not added at this point, unclear if we might look into that later.
Likewise, explicit timeouts are not supported either. It is expected
that users that need timeouts would do so via the usual io_uring
mechanism to do that using linked timeouts.
The SQE format is as follows:
`addr` Address of futex
`fd` futex2(2) FUTEX2_* flags
`futex_flags` io_uring specific command flags. None valid now.
`addr2` Value of futex
`addr3` Mask to wake/wait
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2023-06-08 20:57:40 +03:00
# include "futex.h"
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static int io_no_issue ( struct io_kiocb * req , unsigned int issue_flags )
{
WARN_ON_ONCE ( 1 ) ;
return - ECANCELED ;
}
static __maybe_unused int io_eopnotsupp_prep ( struct io_kiocb * kiocb ,
const struct io_uring_sqe * sqe )
{
return - EOPNOTSUPP ;
}
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const struct io_issue_def io_issue_defs [ ] = {
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[ IORING_OP_NOP ] = {
. audit_skip = 1 ,
. iopoll = 1 ,
. prep = io_nop_prep ,
. issue = io_nop ,
} ,
[ IORING_OP_READV ] = {
. needs_file = 1 ,
. unbound_nonreg_file = 1 ,
. pollin = 1 ,
. buffer_select = 1 ,
. plug = 1 ,
. audit_skip = 1 ,
. ioprio = 1 ,
. iopoll = 1 ,
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. iopoll_queue = 1 ,
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. vectored = 1 ,
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. prep = io_prep_rwv ,
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. issue = io_read ,
} ,
[ IORING_OP_WRITEV ] = {
. needs_file = 1 ,
. hash_reg_file = 1 ,
. unbound_nonreg_file = 1 ,
. pollout = 1 ,
. plug = 1 ,
. audit_skip = 1 ,
. ioprio = 1 ,
. iopoll = 1 ,
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. iopoll_queue = 1 ,
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. vectored = 1 ,
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. prep = io_prep_rwv ,
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. issue = io_write ,
} ,
[ IORING_OP_FSYNC ] = {
. needs_file = 1 ,
. audit_skip = 1 ,
. prep = io_fsync_prep ,
. issue = io_fsync ,
} ,
[ IORING_OP_READ_FIXED ] = {
. needs_file = 1 ,
. unbound_nonreg_file = 1 ,
. pollin = 1 ,
. plug = 1 ,
. audit_skip = 1 ,
. ioprio = 1 ,
. iopoll = 1 ,
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. iopoll_queue = 1 ,
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. prep = io_prep_rw_fixed ,
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. issue = io_read ,
} ,
[ IORING_OP_WRITE_FIXED ] = {
. needs_file = 1 ,
. hash_reg_file = 1 ,
. unbound_nonreg_file = 1 ,
. pollout = 1 ,
. plug = 1 ,
. audit_skip = 1 ,
. ioprio = 1 ,
. iopoll = 1 ,
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. iopoll_queue = 1 ,
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. prep = io_prep_rw_fixed ,
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. issue = io_write ,
} ,
[ IORING_OP_POLL_ADD ] = {
. needs_file = 1 ,
. unbound_nonreg_file = 1 ,
. audit_skip = 1 ,
. prep = io_poll_add_prep ,
. issue = io_poll_add ,
} ,
[ IORING_OP_POLL_REMOVE ] = {
. audit_skip = 1 ,
. prep = io_poll_remove_prep ,
. issue = io_poll_remove ,
} ,
[ IORING_OP_SYNC_FILE_RANGE ] = {
. needs_file = 1 ,
. audit_skip = 1 ,
. prep = io_sfr_prep ,
. issue = io_sync_file_range ,
} ,
[ IORING_OP_SENDMSG ] = {
. needs_file = 1 ,
. unbound_nonreg_file = 1 ,
. pollout = 1 ,
. ioprio = 1 ,
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. manual_alloc = 1 ,
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# if defined(CONFIG_NET)
. prep = io_sendmsg_prep ,
. issue = io_sendmsg ,
# else
. prep = io_eopnotsupp_prep ,
# endif
} ,
[ IORING_OP_RECVMSG ] = {
. needs_file = 1 ,
. unbound_nonreg_file = 1 ,
. pollin = 1 ,
. buffer_select = 1 ,
. ioprio = 1 ,
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. manual_alloc = 1 ,
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# if defined(CONFIG_NET)
. prep = io_recvmsg_prep ,
. issue = io_recvmsg ,
# else
. prep = io_eopnotsupp_prep ,
# endif
} ,
[ IORING_OP_TIMEOUT ] = {
. audit_skip = 1 ,
. prep = io_timeout_prep ,
. issue = io_timeout ,
} ,
[ IORING_OP_TIMEOUT_REMOVE ] = {
/* used by timeout updates' prep() */
. audit_skip = 1 ,
. prep = io_timeout_remove_prep ,
. issue = io_timeout_remove ,
} ,
[ IORING_OP_ACCEPT ] = {
. needs_file = 1 ,
. unbound_nonreg_file = 1 ,
. pollin = 1 ,
. poll_exclusive = 1 ,
. ioprio = 1 , /* used for flags */
# if defined(CONFIG_NET)
. prep = io_accept_prep ,
. issue = io_accept ,
# else
. prep = io_eopnotsupp_prep ,
# endif
} ,
[ IORING_OP_ASYNC_CANCEL ] = {
. audit_skip = 1 ,
. prep = io_async_cancel_prep ,
. issue = io_async_cancel ,
} ,
[ IORING_OP_LINK_TIMEOUT ] = {
. audit_skip = 1 ,
. prep = io_link_timeout_prep ,
. issue = io_no_issue ,
} ,
[ IORING_OP_CONNECT ] = {
. needs_file = 1 ,
. unbound_nonreg_file = 1 ,
. pollout = 1 ,
# if defined(CONFIG_NET)
. prep = io_connect_prep ,
. issue = io_connect ,
# else
. prep = io_eopnotsupp_prep ,
# endif
} ,
[ IORING_OP_FALLOCATE ] = {
. needs_file = 1 ,
. prep = io_fallocate_prep ,
. issue = io_fallocate ,
} ,
[ IORING_OP_OPENAT ] = {
. prep = io_openat_prep ,
. issue = io_openat ,
} ,
[ IORING_OP_CLOSE ] = {
. prep = io_close_prep ,
. issue = io_close ,
} ,
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[ IORING_OP_FILES_UPDATE ] = {
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. audit_skip = 1 ,
. iopoll = 1 ,
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. prep = io_files_update_prep ,
. issue = io_files_update ,
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} ,
[ IORING_OP_STATX ] = {
. audit_skip = 1 ,
. prep = io_statx_prep ,
. issue = io_statx ,
} ,
[ IORING_OP_READ ] = {
. needs_file = 1 ,
. unbound_nonreg_file = 1 ,
. pollin = 1 ,
. buffer_select = 1 ,
. plug = 1 ,
. audit_skip = 1 ,
. ioprio = 1 ,
. iopoll = 1 ,
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. iopoll_queue = 1 ,
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. prep = io_prep_rw ,
. issue = io_read ,
} ,
[ IORING_OP_WRITE ] = {
. needs_file = 1 ,
. hash_reg_file = 1 ,
. unbound_nonreg_file = 1 ,
. pollout = 1 ,
. plug = 1 ,
. audit_skip = 1 ,
. ioprio = 1 ,
. iopoll = 1 ,
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. iopoll_queue = 1 ,
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. prep = io_prep_rw ,
. issue = io_write ,
} ,
[ IORING_OP_FADVISE ] = {
. needs_file = 1 ,
. audit_skip = 1 ,
. prep = io_fadvise_prep ,
. issue = io_fadvise ,
} ,
[ IORING_OP_MADVISE ] = {
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. audit_skip = 1 ,
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. prep = io_madvise_prep ,
. issue = io_madvise ,
} ,
[ IORING_OP_SEND ] = {
. needs_file = 1 ,
. unbound_nonreg_file = 1 ,
. pollout = 1 ,
. audit_skip = 1 ,
. ioprio = 1 ,
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. manual_alloc = 1 ,
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# if defined(CONFIG_NET)
. prep = io_sendmsg_prep ,
. issue = io_send ,
# else
. prep = io_eopnotsupp_prep ,
# endif
} ,
[ IORING_OP_RECV ] = {
. needs_file = 1 ,
. unbound_nonreg_file = 1 ,
. pollin = 1 ,
. buffer_select = 1 ,
. audit_skip = 1 ,
. ioprio = 1 ,
# if defined(CONFIG_NET)
. prep = io_recvmsg_prep ,
. issue = io_recv ,
# else
. prep = io_eopnotsupp_prep ,
# endif
} ,
[ IORING_OP_OPENAT2 ] = {
. prep = io_openat2_prep ,
. issue = io_openat2 ,
} ,
[ IORING_OP_EPOLL_CTL ] = {
. unbound_nonreg_file = 1 ,
. audit_skip = 1 ,
# if defined(CONFIG_EPOLL)
. prep = io_epoll_ctl_prep ,
. issue = io_epoll_ctl ,
# else
. prep = io_eopnotsupp_prep ,
# endif
} ,
[ IORING_OP_SPLICE ] = {
. needs_file = 1 ,
. hash_reg_file = 1 ,
. unbound_nonreg_file = 1 ,
. audit_skip = 1 ,
. prep = io_splice_prep ,
. issue = io_splice ,
} ,
[ IORING_OP_PROVIDE_BUFFERS ] = {
. audit_skip = 1 ,
. iopoll = 1 ,
. prep = io_provide_buffers_prep ,
. issue = io_provide_buffers ,
} ,
[ IORING_OP_REMOVE_BUFFERS ] = {
. audit_skip = 1 ,
. iopoll = 1 ,
. prep = io_remove_buffers_prep ,
. issue = io_remove_buffers ,
} ,
[ IORING_OP_TEE ] = {
. needs_file = 1 ,
. hash_reg_file = 1 ,
. unbound_nonreg_file = 1 ,
. audit_skip = 1 ,
. prep = io_tee_prep ,
. issue = io_tee ,
} ,
[ IORING_OP_SHUTDOWN ] = {
. needs_file = 1 ,
# if defined(CONFIG_NET)
. prep = io_shutdown_prep ,
. issue = io_shutdown ,
# else
. prep = io_eopnotsupp_prep ,
# endif
} ,
[ IORING_OP_RENAMEAT ] = {
. prep = io_renameat_prep ,
. issue = io_renameat ,
} ,
[ IORING_OP_UNLINKAT ] = {
. prep = io_unlinkat_prep ,
. issue = io_unlinkat ,
} ,
[ IORING_OP_MKDIRAT ] = {
. prep = io_mkdirat_prep ,
. issue = io_mkdirat ,
} ,
[ IORING_OP_SYMLINKAT ] = {
. prep = io_symlinkat_prep ,
. issue = io_symlinkat ,
} ,
[ IORING_OP_LINKAT ] = {
. prep = io_linkat_prep ,
. issue = io_linkat ,
} ,
[ IORING_OP_MSG_RING ] = {
. needs_file = 1 ,
. iopoll = 1 ,
. prep = io_msg_ring_prep ,
. issue = io_msg_ring ,
} ,
[ IORING_OP_FSETXATTR ] = {
. needs_file = 1 ,
. prep = io_fsetxattr_prep ,
. issue = io_fsetxattr ,
} ,
[ IORING_OP_SETXATTR ] = {
. prep = io_setxattr_prep ,
. issue = io_setxattr ,
} ,
[ IORING_OP_FGETXATTR ] = {
. needs_file = 1 ,
. prep = io_fgetxattr_prep ,
. issue = io_fgetxattr ,
} ,
[ IORING_OP_GETXATTR ] = {
. prep = io_getxattr_prep ,
. issue = io_getxattr ,
} ,
[ IORING_OP_SOCKET ] = {
. audit_skip = 1 ,
# if defined(CONFIG_NET)
. prep = io_socket_prep ,
. issue = io_socket ,
# else
. prep = io_eopnotsupp_prep ,
# endif
} ,
[ IORING_OP_URING_CMD ] = {
. needs_file = 1 ,
. plug = 1 ,
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. iopoll = 1 ,
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. iopoll_queue = 1 ,
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. prep = io_uring_cmd_prep ,
. issue = io_uring_cmd ,
} ,
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[ IORING_OP_SEND_ZC ] = {
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. needs_file = 1 ,
. unbound_nonreg_file = 1 ,
. pollout = 1 ,
. audit_skip = 1 ,
. ioprio = 1 ,
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. manual_alloc = 1 ,
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# if defined(CONFIG_NET)
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. prep = io_send_zc_prep ,
. issue = io_send_zc ,
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# else
. prep = io_eopnotsupp_prep ,
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# endif
} ,
[ IORING_OP_SENDMSG_ZC ] = {
. needs_file = 1 ,
. unbound_nonreg_file = 1 ,
. pollout = 1 ,
. ioprio = 1 ,
. manual_alloc = 1 ,
# if defined(CONFIG_NET)
. prep = io_send_zc_prep ,
. issue = io_sendmsg_zc ,
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# else
. prep = io_eopnotsupp_prep ,
# endif
} ,
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[ IORING_OP_READ_MULTISHOT ] = {
. needs_file = 1 ,
. unbound_nonreg_file = 1 ,
. pollin = 1 ,
. buffer_select = 1 ,
. audit_skip = 1 ,
. prep = io_read_mshot_prep ,
. issue = io_read_mshot ,
} ,
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[ IORING_OP_WAITID ] = {
. prep = io_waitid_prep ,
. issue = io_waitid ,
} ,
io_uring: add support for futex wake and wait
Add support for FUTEX_WAKE/WAIT primitives.
IORING_OP_FUTEX_WAKE is mix of FUTEX_WAKE and FUTEX_WAKE_BITSET, as
it does support passing in a bitset.
Similary, IORING_OP_FUTEX_WAIT is a mix of FUTEX_WAIT and
FUTEX_WAIT_BITSET.
For both of them, they are using the futex2 interface.
FUTEX_WAKE is straight forward, as those can always be done directly from
the io_uring submission without needing async handling. For FUTEX_WAIT,
things are a bit more complicated. If the futex isn't ready, then we
rely on a callback via futex_queue->wake() when someone wakes up the
futex. From that calback, we queue up task_work with the original task,
which will post a CQE and wake it, if necessary.
Cancelations are supported, both from the application point-of-view,
but also to be able to cancel pending waits if the ring exits before
all events have occurred. The return value of futex_unqueue() is used
to gate who wins the potential race between cancelation and futex
wakeups. Whomever gets a 'ret == 1' return from that claims ownership
of the io_uring futex request.
This is just the barebones wait/wake support. PI or REQUEUE support is
not added at this point, unclear if we might look into that later.
Likewise, explicit timeouts are not supported either. It is expected
that users that need timeouts would do so via the usual io_uring
mechanism to do that using linked timeouts.
The SQE format is as follows:
`addr` Address of futex
`fd` futex2(2) FUTEX2_* flags
`futex_flags` io_uring specific command flags. None valid now.
`addr2` Value of futex
`addr3` Mask to wake/wait
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2023-06-08 20:57:40 +03:00
[ IORING_OP_FUTEX_WAIT ] = {
# if defined(CONFIG_FUTEX)
. prep = io_futex_prep ,
. issue = io_futex_wait ,
# else
. prep = io_eopnotsupp_prep ,
# endif
} ,
[ IORING_OP_FUTEX_WAKE ] = {
# if defined(CONFIG_FUTEX)
. prep = io_futex_prep ,
. issue = io_futex_wake ,
# else
. prep = io_eopnotsupp_prep ,
io_uring: add support for vectored futex waits
This adds support for IORING_OP_FUTEX_WAITV, which allows registering a
notification for a number of futexes at once. If one of the futexes are
woken, then the request will complete with the index of the futex that got
woken as the result. This is identical to what the normal vectored futex
waitv operation does.
Use like IORING_OP_FUTEX_WAIT, except sqe->addr must now contain a
pointer to a struct futex_waitv array, and sqe->off must now contain the
number of elements in that array. As flags are passed in the futex_vector
array, and likewise for the value and futex address(es), sqe->addr2
and sqe->addr3 are also reserved for IORING_OP_FUTEX_WAITV.
For cancelations, FUTEX_WAITV does not rely on the futex_unqueue()
return value as we're dealing with multiple futexes. Instead, a separate
per io_uring request atomic is used to claim ownership of the request.
Waiting on N futexes could be done with IORING_OP_FUTEX_WAIT as well,
but that punts a lot of the work to the application:
1) Application would need to submit N IORING_OP_FUTEX_WAIT requests,
rather than just a single IORING_OP_FUTEX_WAITV.
2) When one futex is woken, application would need to cancel the
remaining N-1 requests that didn't trigger.
While this is of course doable, having a single vectored futex wait
makes for much simpler application code.
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2023-06-13 04:04:32 +03:00
# endif
} ,
[ IORING_OP_FUTEX_WAITV ] = {
# if defined(CONFIG_FUTEX)
. prep = io_futexv_prep ,
. issue = io_futexv_wait ,
# else
. prep = io_eopnotsupp_prep ,
io_uring: add support for futex wake and wait
Add support for FUTEX_WAKE/WAIT primitives.
IORING_OP_FUTEX_WAKE is mix of FUTEX_WAKE and FUTEX_WAKE_BITSET, as
it does support passing in a bitset.
Similary, IORING_OP_FUTEX_WAIT is a mix of FUTEX_WAIT and
FUTEX_WAIT_BITSET.
For both of them, they are using the futex2 interface.
FUTEX_WAKE is straight forward, as those can always be done directly from
the io_uring submission without needing async handling. For FUTEX_WAIT,
things are a bit more complicated. If the futex isn't ready, then we
rely on a callback via futex_queue->wake() when someone wakes up the
futex. From that calback, we queue up task_work with the original task,
which will post a CQE and wake it, if necessary.
Cancelations are supported, both from the application point-of-view,
but also to be able to cancel pending waits if the ring exits before
all events have occurred. The return value of futex_unqueue() is used
to gate who wins the potential race between cancelation and futex
wakeups. Whomever gets a 'ret == 1' return from that claims ownership
of the io_uring futex request.
This is just the barebones wait/wake support. PI or REQUEUE support is
not added at this point, unclear if we might look into that later.
Likewise, explicit timeouts are not supported either. It is expected
that users that need timeouts would do so via the usual io_uring
mechanism to do that using linked timeouts.
The SQE format is as follows:
`addr` Address of futex
`fd` futex2(2) FUTEX2_* flags
`futex_flags` io_uring specific command flags. None valid now.
`addr2` Value of futex
`addr3` Mask to wake/wait
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2023-06-08 20:57:40 +03:00
# endif
} ,
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} ;
const struct io_cold_def io_cold_defs [ ] = {
[ IORING_OP_NOP ] = {
. name = " NOP " ,
} ,
[ IORING_OP_READV ] = {
. async_size = sizeof ( struct io_async_rw ) ,
. name = " READV " ,
. prep_async = io_readv_prep_async ,
. cleanup = io_readv_writev_cleanup ,
. fail = io_rw_fail ,
} ,
[ IORING_OP_WRITEV ] = {
. async_size = sizeof ( struct io_async_rw ) ,
. name = " WRITEV " ,
. prep_async = io_writev_prep_async ,
. cleanup = io_readv_writev_cleanup ,
. fail = io_rw_fail ,
} ,
[ IORING_OP_FSYNC ] = {
. name = " FSYNC " ,
} ,
[ IORING_OP_READ_FIXED ] = {
. async_size = sizeof ( struct io_async_rw ) ,
. name = " READ_FIXED " ,
. fail = io_rw_fail ,
} ,
[ IORING_OP_WRITE_FIXED ] = {
. async_size = sizeof ( struct io_async_rw ) ,
. name = " WRITE_FIXED " ,
. fail = io_rw_fail ,
} ,
[ IORING_OP_POLL_ADD ] = {
. name = " POLL_ADD " ,
} ,
[ IORING_OP_POLL_REMOVE ] = {
. name = " POLL_REMOVE " ,
} ,
[ IORING_OP_SYNC_FILE_RANGE ] = {
. name = " SYNC_FILE_RANGE " ,
} ,
[ IORING_OP_SENDMSG ] = {
. name = " SENDMSG " ,
# if defined(CONFIG_NET)
. async_size = sizeof ( struct io_async_msghdr ) ,
. prep_async = io_sendmsg_prep_async ,
. cleanup = io_sendmsg_recvmsg_cleanup ,
. fail = io_sendrecv_fail ,
# endif
} ,
[ IORING_OP_RECVMSG ] = {
. name = " RECVMSG " ,
# if defined(CONFIG_NET)
. async_size = sizeof ( struct io_async_msghdr ) ,
. prep_async = io_recvmsg_prep_async ,
. cleanup = io_sendmsg_recvmsg_cleanup ,
. fail = io_sendrecv_fail ,
# endif
} ,
[ IORING_OP_TIMEOUT ] = {
. async_size = sizeof ( struct io_timeout_data ) ,
. name = " TIMEOUT " ,
} ,
[ IORING_OP_TIMEOUT_REMOVE ] = {
. name = " TIMEOUT_REMOVE " ,
} ,
[ IORING_OP_ACCEPT ] = {
. name = " ACCEPT " ,
} ,
[ IORING_OP_ASYNC_CANCEL ] = {
. name = " ASYNC_CANCEL " ,
} ,
[ IORING_OP_LINK_TIMEOUT ] = {
. async_size = sizeof ( struct io_timeout_data ) ,
. name = " LINK_TIMEOUT " ,
} ,
[ IORING_OP_CONNECT ] = {
. name = " CONNECT " ,
# if defined(CONFIG_NET)
. async_size = sizeof ( struct io_async_connect ) ,
. prep_async = io_connect_prep_async ,
# endif
} ,
[ IORING_OP_FALLOCATE ] = {
. name = " FALLOCATE " ,
} ,
[ IORING_OP_OPENAT ] = {
. name = " OPENAT " ,
. cleanup = io_open_cleanup ,
} ,
[ IORING_OP_CLOSE ] = {
. name = " CLOSE " ,
} ,
[ IORING_OP_FILES_UPDATE ] = {
. name = " FILES_UPDATE " ,
} ,
[ IORING_OP_STATX ] = {
. name = " STATX " ,
. cleanup = io_statx_cleanup ,
} ,
[ IORING_OP_READ ] = {
. async_size = sizeof ( struct io_async_rw ) ,
. name = " READ " ,
. fail = io_rw_fail ,
} ,
[ IORING_OP_WRITE ] = {
. async_size = sizeof ( struct io_async_rw ) ,
. name = " WRITE " ,
. fail = io_rw_fail ,
} ,
[ IORING_OP_FADVISE ] = {
. name = " FADVISE " ,
} ,
[ IORING_OP_MADVISE ] = {
. name = " MADVISE " ,
} ,
[ IORING_OP_SEND ] = {
. name = " SEND " ,
# if defined(CONFIG_NET)
. async_size = sizeof ( struct io_async_msghdr ) ,
. fail = io_sendrecv_fail ,
. prep_async = io_send_prep_async ,
# endif
} ,
[ IORING_OP_RECV ] = {
. name = " RECV " ,
# if defined(CONFIG_NET)
. fail = io_sendrecv_fail ,
# endif
} ,
[ IORING_OP_OPENAT2 ] = {
. name = " OPENAT2 " ,
. cleanup = io_open_cleanup ,
} ,
[ IORING_OP_EPOLL_CTL ] = {
. name = " EPOLL " ,
} ,
[ IORING_OP_SPLICE ] = {
. name = " SPLICE " ,
} ,
[ IORING_OP_PROVIDE_BUFFERS ] = {
. name = " PROVIDE_BUFFERS " ,
} ,
[ IORING_OP_REMOVE_BUFFERS ] = {
. name = " REMOVE_BUFFERS " ,
} ,
[ IORING_OP_TEE ] = {
. name = " TEE " ,
} ,
[ IORING_OP_SHUTDOWN ] = {
. name = " SHUTDOWN " ,
} ,
[ IORING_OP_RENAMEAT ] = {
. name = " RENAMEAT " ,
. cleanup = io_renameat_cleanup ,
} ,
[ IORING_OP_UNLINKAT ] = {
. name = " UNLINKAT " ,
. cleanup = io_unlinkat_cleanup ,
} ,
[ IORING_OP_MKDIRAT ] = {
. name = " MKDIRAT " ,
. cleanup = io_mkdirat_cleanup ,
} ,
[ IORING_OP_SYMLINKAT ] = {
. name = " SYMLINKAT " ,
. cleanup = io_link_cleanup ,
} ,
[ IORING_OP_LINKAT ] = {
. name = " LINKAT " ,
. cleanup = io_link_cleanup ,
} ,
[ IORING_OP_MSG_RING ] = {
. name = " MSG_RING " ,
. cleanup = io_msg_ring_cleanup ,
} ,
[ IORING_OP_FSETXATTR ] = {
. name = " FSETXATTR " ,
. cleanup = io_xattr_cleanup ,
} ,
[ IORING_OP_SETXATTR ] = {
. name = " SETXATTR " ,
. cleanup = io_xattr_cleanup ,
} ,
[ IORING_OP_FGETXATTR ] = {
. name = " FGETXATTR " ,
. cleanup = io_xattr_cleanup ,
} ,
[ IORING_OP_GETXATTR ] = {
. name = " GETXATTR " ,
. cleanup = io_xattr_cleanup ,
} ,
[ IORING_OP_SOCKET ] = {
. name = " SOCKET " ,
} ,
[ IORING_OP_URING_CMD ] = {
. name = " URING_CMD " ,
io_uring: Pass whole sqe to commands
Currently uring CMD operation relies on having large SQEs, but future
operations might want to use normal SQE.
The io_uring_cmd currently only saves the payload (cmd) part of the SQE,
but, for commands that use normal SQE size, it might be necessary to
access the initial SQE fields outside of the payload/cmd block. So,
saves the whole SQE other than just the pdu.
This changes slightly how the io_uring_cmd works, since the cmd
structures and callbacks are not opaque to io_uring anymore. I.e, the
callbacks can look at the SQE entries, not only, in the cmd structure.
The main advantage is that we don't need to create custom structures for
simple commands.
Creates io_uring_sqe_cmd() that returns the cmd private data as a null
pointer and avoids casting in the callee side.
Also, make most of ublk_drv's sqe->cmd priv structure into const, and use
io_uring_sqe_cmd() to get the private structure, removing the unwanted
cast. (There is one case where the cast is still needed since the
header->{len,addr} is updated in the private structure)
Suggested-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Breno Leitao <leitao@debian.org>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/20230504121856.904491-3-leitao@debian.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2023-05-04 15:18:55 +03:00
. async_size = 2 * sizeof ( struct io_uring_sqe ) ,
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. prep_async = io_uring_cmd_prep_async ,
} ,
[ IORING_OP_SEND_ZC ] = {
. name = " SEND_ZC " ,
# if defined(CONFIG_NET)
. async_size = sizeof ( struct io_async_msghdr ) ,
. prep_async = io_send_prep_async ,
. cleanup = io_send_zc_cleanup ,
. fail = io_sendrecv_fail ,
# endif
} ,
[ IORING_OP_SENDMSG_ZC ] = {
. name = " SENDMSG_ZC " ,
# if defined(CONFIG_NET)
. async_size = sizeof ( struct io_async_msghdr ) ,
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. prep_async = io_sendmsg_prep_async ,
. cleanup = io_send_zc_cleanup ,
. fail = io_sendrecv_fail ,
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# endif
} ,
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[ IORING_OP_READ_MULTISHOT ] = {
. name = " READ_MULTISHOT " ,
} ,
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[ IORING_OP_WAITID ] = {
. name = " WAITID " ,
. async_size = sizeof ( struct io_waitid_async ) ,
} ,
io_uring: add support for futex wake and wait
Add support for FUTEX_WAKE/WAIT primitives.
IORING_OP_FUTEX_WAKE is mix of FUTEX_WAKE and FUTEX_WAKE_BITSET, as
it does support passing in a bitset.
Similary, IORING_OP_FUTEX_WAIT is a mix of FUTEX_WAIT and
FUTEX_WAIT_BITSET.
For both of them, they are using the futex2 interface.
FUTEX_WAKE is straight forward, as those can always be done directly from
the io_uring submission without needing async handling. For FUTEX_WAIT,
things are a bit more complicated. If the futex isn't ready, then we
rely on a callback via futex_queue->wake() when someone wakes up the
futex. From that calback, we queue up task_work with the original task,
which will post a CQE and wake it, if necessary.
Cancelations are supported, both from the application point-of-view,
but also to be able to cancel pending waits if the ring exits before
all events have occurred. The return value of futex_unqueue() is used
to gate who wins the potential race between cancelation and futex
wakeups. Whomever gets a 'ret == 1' return from that claims ownership
of the io_uring futex request.
This is just the barebones wait/wake support. PI or REQUEUE support is
not added at this point, unclear if we might look into that later.
Likewise, explicit timeouts are not supported either. It is expected
that users that need timeouts would do so via the usual io_uring
mechanism to do that using linked timeouts.
The SQE format is as follows:
`addr` Address of futex
`fd` futex2(2) FUTEX2_* flags
`futex_flags` io_uring specific command flags. None valid now.
`addr2` Value of futex
`addr3` Mask to wake/wait
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2023-06-08 20:57:40 +03:00
[ IORING_OP_FUTEX_WAIT ] = {
. name = " FUTEX_WAIT " ,
} ,
[ IORING_OP_FUTEX_WAKE ] = {
. name = " FUTEX_WAKE " ,
} ,
io_uring: add support for vectored futex waits
This adds support for IORING_OP_FUTEX_WAITV, which allows registering a
notification for a number of futexes at once. If one of the futexes are
woken, then the request will complete with the index of the futex that got
woken as the result. This is identical to what the normal vectored futex
waitv operation does.
Use like IORING_OP_FUTEX_WAIT, except sqe->addr must now contain a
pointer to a struct futex_waitv array, and sqe->off must now contain the
number of elements in that array. As flags are passed in the futex_vector
array, and likewise for the value and futex address(es), sqe->addr2
and sqe->addr3 are also reserved for IORING_OP_FUTEX_WAITV.
For cancelations, FUTEX_WAITV does not rely on the futex_unqueue()
return value as we're dealing with multiple futexes. Instead, a separate
per io_uring request atomic is used to claim ownership of the request.
Waiting on N futexes could be done with IORING_OP_FUTEX_WAIT as well,
but that punts a lot of the work to the application:
1) Application would need to submit N IORING_OP_FUTEX_WAIT requests,
rather than just a single IORING_OP_FUTEX_WAITV.
2) When one futex is woken, application would need to cancel the
remaining N-1 requests that didn't trigger.
While this is of course doable, having a single vectored futex wait
makes for much simpler application code.
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2023-06-13 04:04:32 +03:00
[ IORING_OP_FUTEX_WAITV ] = {
. name = " FUTEX_WAITV " ,
} ,
2022-06-16 01:27:42 +03:00
} ;
const char * io_uring_get_opcode ( u8 opcode )
{
if ( opcode < IORING_OP_LAST )
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return io_cold_defs [ opcode ] . name ;
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return " INVALID " ;
}
void __init io_uring_optable_init ( void )
{
int i ;
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BUILD_BUG_ON ( ARRAY_SIZE ( io_cold_defs ) ! = IORING_OP_LAST ) ;
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BUILD_BUG_ON ( ARRAY_SIZE ( io_issue_defs ) ! = IORING_OP_LAST ) ;
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for ( i = 0 ; i < ARRAY_SIZE ( io_issue_defs ) ; i + + ) {
BUG_ON ( ! io_issue_defs [ i ] . prep ) ;
if ( io_issue_defs [ i ] . prep ! = io_eopnotsupp_prep )
BUG_ON ( ! io_issue_defs [ i ] . issue ) ;
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WARN_ON_ONCE ( ! io_cold_defs [ i ] . name ) ;
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}
}
