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io_uring: Split io_issue_def struct 

This patch removes some "cold" fields from `struct io_issue_def`.

The plan is to keep only highly used fields into `struct io_issue_def`, so,
it may be hot in the cache. The hot fields are basically all the bitfields
and the callback functions for .issue and .prep.

The other less frequently used fields are now located in a secondary and
cold struct, called `io_cold_def`.

This is the size for the structs:

Before: io_issue_def = 56 bytes
After: io_issue_def = 24 bytes; io_cold_def = 40 bytes

Signed-off-by: Breno Leitao <leitao@debian.org>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/20230112144411.2624698-2-leitao@debian.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Breno Leitao 2023-01-12 06:44:11 -08:00 committed by Jens Axboe
parent a7dd27828b
commit f30bd4d038
4 changed files with 238 additions and 115 deletions
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15
io_uring/io_uring.c
View File

@ -1009,7 +1009,7 @@ void io_req_complete_post(struct io_kiocb *req, unsigned issue_flags)
void io_req_defer_failed(struct io_kiocb *req, s32 res)
__must_hold(&ctx->uring_lock)
{
const struct io_issue_def *def = &io_issue_defs[req->opcode];
const struct io_cold_def *def = &io_cold_defs[req->opcode];
lockdep_assert_held(&req->ctx->uring_lock);
@ -1741,8 +1741,8 @@ unsigned int io_file_get_flags(struct file *file)
bool io_alloc_async_data(struct io_kiocb *req)
{
WARN_ON_ONCE(!io_issue_defs[req->opcode].async_size);
req->async_data = kmalloc(io_issue_defs[req->opcode].async_size, GFP_KERNEL);
WARN_ON_ONCE(!io_cold_defs[req->opcode].async_size);
req->async_data = kmalloc(io_cold_defs[req->opcode].async_size, GFP_KERNEL);
if (req->async_data) {
req->flags |= REQ_F_ASYNC_DATA;
return false;
@ -1752,20 +1752,21 @@ bool io_alloc_async_data(struct io_kiocb *req)
int io_req_prep_async(struct io_kiocb *req)
{
const struct io_cold_def *cdef = &io_cold_defs[req->opcode];
const struct io_issue_def *def = &io_issue_defs[req->opcode];
/* assign early for deferred execution for non-fixed file */
if (def->needs_file && !(req->flags & REQ_F_FIXED_FILE))
req->file = io_file_get_normal(req, req->cqe.fd);
if (!def->prep_async)
if (!cdef->prep_async)
return 0;
if (WARN_ON_ONCE(req_has_async_data(req)))
return -EFAULT;
if (!io_issue_defs[req->opcode].manual_alloc) {
if (!def->manual_alloc) {
if (io_alloc_async_data(req))
return -EAGAIN;
}
return def->prep_async(req);
return cdef->prep_async(req);
}
static u32 io_get_sequence(struct io_kiocb *req)
@ -1829,7 +1830,7 @@ static void io_clean_op(struct io_kiocb *req)
}
if (req->flags & REQ_F_NEED_CLEANUP) {
const struct io_issue_def *def = &io_issue_defs[req->opcode];
const struct io_cold_def *def = &io_cold_defs[req->opcode];
if (def->cleanup)
def->cleanup(req);

327
io_uring/opdef.c
View File

@ -50,7 +50,6 @@ const struct io_issue_def io_issue_defs[] = {
[IORING_OP_NOP] = {
.audit_skip = 1,
.iopoll = 1,
.name = "NOP",
.prep = io_nop_prep,
.issue = io_nop,
},
@ -64,13 +63,8 @@ const struct io_issue_def io_issue_defs[] = {
.ioprio = 1,
.iopoll = 1,
.iopoll_queue = 1,
.async_size = sizeof(struct io_async_rw),
.name = "READV",
.prep = io_prep_rw,
.issue = io_read,
.prep_async = io_readv_prep_async,
.cleanup = io_readv_writev_cleanup,
.fail = io_rw_fail,
},
[IORING_OP_WRITEV] = {
.needs_file = 1,
@ -82,18 +76,12 @@ const struct io_issue_def io_issue_defs[] = {
.ioprio = 1,
.iopoll = 1,
.iopoll_queue = 1,
.async_size = sizeof(struct io_async_rw),
.name = "WRITEV",
.prep = io_prep_rw,
.issue = io_write,
.prep_async = io_writev_prep_async,
.cleanup = io_readv_writev_cleanup,
.fail = io_rw_fail,
},
[IORING_OP_FSYNC] = {
.needs_file = 1,
.audit_skip = 1,
.name = "FSYNC",
.prep = io_fsync_prep,
.issue = io_fsync,
},
@ -106,11 +94,8 @@ const struct io_issue_def io_issue_defs[] = {
.ioprio = 1,
.iopoll = 1,
.iopoll_queue = 1,
.async_size = sizeof(struct io_async_rw),
.name = "READ_FIXED",
.prep = io_prep_rw,
.issue = io_read,
.fail = io_rw_fail,
},
[IORING_OP_WRITE_FIXED] = {
.needs_file = 1,
@ -122,30 +107,24 @@ const struct io_issue_def io_issue_defs[] = {
.ioprio = 1,
.iopoll = 1,
.iopoll_queue = 1,
.async_size = sizeof(struct io_async_rw),
.name = "WRITE_FIXED",
.prep = io_prep_rw,
.issue = io_write,
.fail = io_rw_fail,
},
[IORING_OP_POLL_ADD] = {
.needs_file = 1,
.unbound_nonreg_file = 1,
.audit_skip = 1,
.name = "POLL_ADD",
.prep = io_poll_add_prep,
.issue = io_poll_add,
},
[IORING_OP_POLL_REMOVE] = {
.audit_skip = 1,
.name = "POLL_REMOVE",
.prep = io_poll_remove_prep,
.issue = io_poll_remove,
},
[IORING_OP_SYNC_FILE_RANGE] = {
.needs_file = 1,
.audit_skip = 1,
.name = "SYNC_FILE_RANGE",
.prep = io_sfr_prep,
.issue = io_sync_file_range,
},
@ -155,14 +134,9 @@ const struct io_issue_def io_issue_defs[] = {
.pollout = 1,
.ioprio = 1,
.manual_alloc = 1,
.name = "SENDMSG",
#if defined(CONFIG_NET)
.async_size = sizeof(struct io_async_msghdr),
.prep = io_sendmsg_prep,
.issue = io_sendmsg,
.prep_async = io_sendmsg_prep_async,
.cleanup = io_sendmsg_recvmsg_cleanup,
.fail = io_sendrecv_fail,
#else
.prep = io_eopnotsupp_prep,
#endif
@ -174,29 +148,21 @@ const struct io_issue_def io_issue_defs[] = {
.buffer_select = 1,
.ioprio = 1,
.manual_alloc = 1,
.name = "RECVMSG",
#if defined(CONFIG_NET)
.async_size = sizeof(struct io_async_msghdr),
.prep = io_recvmsg_prep,
.issue = io_recvmsg,
.prep_async = io_recvmsg_prep_async,
.cleanup = io_sendmsg_recvmsg_cleanup,
.fail = io_sendrecv_fail,
#else
.prep = io_eopnotsupp_prep,
#endif
},
[IORING_OP_TIMEOUT] = {
.audit_skip = 1,
.async_size = sizeof(struct io_timeout_data),
.name = "TIMEOUT",
.prep = io_timeout_prep,
.issue = io_timeout,
},
[IORING_OP_TIMEOUT_REMOVE] = {
/* used by timeout updates' prep() */
.audit_skip = 1,
.name = "TIMEOUT_REMOVE",
.prep = io_timeout_remove_prep,
.issue = io_timeout_remove,
},
@ -206,7 +172,6 @@ const struct io_issue_def io_issue_defs[] = {
.pollin = 1,
.poll_exclusive = 1,
.ioprio = 1, /* used for flags */
.name = "ACCEPT",
#if defined(CONFIG_NET)
.prep = io_accept_prep,
.issue = io_accept,
@ -216,14 +181,11 @@ const struct io_issue_def io_issue_defs[] = {
},
[IORING_OP_ASYNC_CANCEL] = {
.audit_skip = 1,
.name = "ASYNC_CANCEL",
.prep = io_async_cancel_prep,
.issue = io_async_cancel,
},
[IORING_OP_LINK_TIMEOUT] = {
.audit_skip = 1,
.async_size = sizeof(struct io_timeout_data),
.name = "LINK_TIMEOUT",
.prep = io_link_timeout_prep,
.issue = io_no_issue,
},
@ -231,46 +193,36 @@ const struct io_issue_def io_issue_defs[] = {
.needs_file = 1,
.unbound_nonreg_file = 1,
.pollout = 1,
.name = "CONNECT",
#if defined(CONFIG_NET)
.async_size = sizeof(struct io_async_connect),
.prep = io_connect_prep,
.issue = io_connect,
.prep_async = io_connect_prep_async,
#else
.prep = io_eopnotsupp_prep,
#endif
},
[IORING_OP_FALLOCATE] = {
.needs_file = 1,
.name = "FALLOCATE",
.prep = io_fallocate_prep,
.issue = io_fallocate,
},
[IORING_OP_OPENAT] = {
.name = "OPENAT",
.prep = io_openat_prep,
.issue = io_openat,
.cleanup = io_open_cleanup,
},
[IORING_OP_CLOSE] = {
.name = "CLOSE",
.prep = io_close_prep,
.issue = io_close,
},
[IORING_OP_FILES_UPDATE] = {
.audit_skip = 1,
.iopoll = 1,
.name = "FILES_UPDATE",
.prep = io_files_update_prep,
.issue = io_files_update,
},
[IORING_OP_STATX] = {
.audit_skip = 1,
.name = "STATX",
.prep = io_statx_prep,
.issue = io_statx,
.cleanup = io_statx_cleanup,
},
[IORING_OP_READ] = {
.needs_file = 1,
@ -282,11 +234,8 @@ const struct io_issue_def io_issue_defs[] = {
.ioprio = 1,
.iopoll = 1,
.iopoll_queue = 1,
.async_size = sizeof(struct io_async_rw),
.name = "READ",
.prep = io_prep_rw,
.issue = io_read,
.fail = io_rw_fail,
},
[IORING_OP_WRITE] = {
.needs_file = 1,
@ -298,21 +247,16 @@ const struct io_issue_def io_issue_defs[] = {
.ioprio = 1,
.iopoll = 1,
.iopoll_queue = 1,
.async_size = sizeof(struct io_async_rw),
.name = "WRITE",
.prep = io_prep_rw,
.issue = io_write,
.fail = io_rw_fail,
},
[IORING_OP_FADVISE] = {
.needs_file = 1,
.audit_skip = 1,
.name = "FADVISE",
.prep = io_fadvise_prep,
.issue = io_fadvise,
},
[IORING_OP_MADVISE] = {
.name = "MADVISE",
.prep = io_madvise_prep,
.issue = io_madvise,
},
@ -323,13 +267,9 @@ const struct io_issue_def io_issue_defs[] = {
.audit_skip = 1,
.ioprio = 1,
.manual_alloc = 1,
.name = "SEND",
#if defined(CONFIG_NET)
.async_size = sizeof(struct io_async_msghdr),
.prep = io_sendmsg_prep,
.issue = io_send,
.fail = io_sendrecv_fail,
.prep_async = io_send_prep_async,
#else
.prep = io_eopnotsupp_prep,
#endif
@ -341,25 +281,20 @@ const struct io_issue_def io_issue_defs[] = {
.buffer_select = 1,
.audit_skip = 1,
.ioprio = 1,
.name = "RECV",
#if defined(CONFIG_NET)
.prep = io_recvmsg_prep,
.issue = io_recv,
.fail = io_sendrecv_fail,
#else
.prep = io_eopnotsupp_prep,
#endif
},
[IORING_OP_OPENAT2] = {
.name = "OPENAT2",
.prep = io_openat2_prep,
.issue = io_openat2,
.cleanup = io_open_cleanup,
},
[IORING_OP_EPOLL_CTL] = {
.unbound_nonreg_file = 1,
.audit_skip = 1,
.name = "EPOLL",
#if defined(CONFIG_EPOLL)
.prep = io_epoll_ctl_prep,
.issue = io_epoll_ctl,
@ -372,21 +307,18 @@ const struct io_issue_def io_issue_defs[] = {
.hash_reg_file = 1,
.unbound_nonreg_file = 1,
.audit_skip = 1,
.name = "SPLICE",
.prep = io_splice_prep,
.issue = io_splice,
},
[IORING_OP_PROVIDE_BUFFERS] = {
.audit_skip = 1,
.iopoll = 1,
.name = "PROVIDE_BUFFERS",
.prep = io_provide_buffers_prep,
.issue = io_provide_buffers,
},
[IORING_OP_REMOVE_BUFFERS] = {
.audit_skip = 1,
.iopoll = 1,
.name = "REMOVE_BUFFERS",
.prep = io_remove_buffers_prep,
.issue = io_remove_buffers,
},
@ -395,13 +327,11 @@ const struct io_issue_def io_issue_defs[] = {
.hash_reg_file = 1,
.unbound_nonreg_file = 1,
.audit_skip = 1,
.name = "TEE",
.prep = io_tee_prep,
.issue = io_tee,
},
[IORING_OP_SHUTDOWN] = {
.needs_file = 1,
.name = "SHUTDOWN",
#if defined(CONFIG_NET)
.prep = io_shutdown_prep,
.issue = io_shutdown,
@ -410,72 +340,51 @@ const struct io_issue_def io_issue_defs[] = {
#endif
},
[IORING_OP_RENAMEAT] = {
.name = "RENAMEAT",
.prep = io_renameat_prep,
.issue = io_renameat,
.cleanup = io_renameat_cleanup,
},
[IORING_OP_UNLINKAT] = {
.name = "UNLINKAT",
.prep = io_unlinkat_prep,
.issue = io_unlinkat,
.cleanup = io_unlinkat_cleanup,
},
[IORING_OP_MKDIRAT] = {
.name = "MKDIRAT",
.prep = io_mkdirat_prep,
.issue = io_mkdirat,
.cleanup = io_mkdirat_cleanup,
},
[IORING_OP_SYMLINKAT] = {
.name = "SYMLINKAT",
.prep = io_symlinkat_prep,
.issue = io_symlinkat,
.cleanup = io_link_cleanup,
},
[IORING_OP_LINKAT] = {
.name = "LINKAT",
.prep = io_linkat_prep,
.issue = io_linkat,
.cleanup = io_link_cleanup,
},
[IORING_OP_MSG_RING] = {
.needs_file = 1,
.iopoll = 1,
.name = "MSG_RING",
.prep = io_msg_ring_prep,
.issue = io_msg_ring,
.cleanup = io_msg_ring_cleanup,
},
[IORING_OP_FSETXATTR] = {
.needs_file = 1,
.name = "FSETXATTR",
.prep = io_fsetxattr_prep,
.issue = io_fsetxattr,
.cleanup = io_xattr_cleanup,
},
[IORING_OP_SETXATTR] = {
.name = "SETXATTR",
.prep = io_setxattr_prep,
.issue = io_setxattr,
.cleanup = io_xattr_cleanup,
},
[IORING_OP_FGETXATTR] = {
.needs_file = 1,
.name = "FGETXATTR",
.prep = io_fgetxattr_prep,
.issue = io_fgetxattr,
.cleanup = io_xattr_cleanup,
},
[IORING_OP_GETXATTR] = {
.name = "GETXATTR",
.prep = io_getxattr_prep,
.issue = io_getxattr,
.cleanup = io_xattr_cleanup,
},
[IORING_OP_SOCKET] = {
.audit_skip = 1,
.name = "SOCKET",
#if defined(CONFIG_NET)
.prep = io_socket_prep,
.issue = io_socket,
@ -486,16 +395,12 @@ const struct io_issue_def io_issue_defs[] = {
[IORING_OP_URING_CMD] = {
.needs_file = 1,
.plug = 1,
.name = "URING_CMD",
.iopoll = 1,
.iopoll_queue = 1,
.async_size = uring_cmd_pdu_size(1),
.prep = io_uring_cmd_prep,
.issue = io_uring_cmd,
.prep_async = io_uring_cmd_prep_async,
},
[IORING_OP_SEND_ZC] = {
.name = "SEND_ZC",
.needs_file = 1,
.unbound_nonreg_file = 1,
.pollout = 1,
@ -503,32 +408,243 @@ const struct io_issue_def io_issue_defs[] = {
.ioprio = 1,
.manual_alloc = 1,
#if defined(CONFIG_NET)
.async_size = sizeof(struct io_async_msghdr),
.prep = io_send_zc_prep,
.issue = io_send_zc,
.prep_async = io_send_prep_async,
.cleanup = io_send_zc_cleanup,
.fail = io_sendrecv_fail,
#else
.prep = io_eopnotsupp_prep,
#endif
},
[IORING_OP_SENDMSG_ZC] = {
.name = "SENDMSG_ZC",
.needs_file = 1,
.unbound_nonreg_file = 1,
.pollout = 1,
.ioprio = 1,
.manual_alloc = 1,
#if defined(CONFIG_NET)
.async_size = sizeof(struct io_async_msghdr),
.prep = io_send_zc_prep,
.issue = io_sendmsg_zc,
#else
.prep = io_eopnotsupp_prep,
#endif
},
};
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",
.async_size = uring_cmd_pdu_size(1),
.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),
.prep_async = io_sendmsg_prep_async,
.cleanup = io_send_zc_cleanup,
.fail = io_sendrecv_fail,
#else
.prep = io_eopnotsupp_prep,
#endif
},
};
@ -536,7 +652,7 @@ const struct io_issue_def io_issue_defs[] = {
const char *io_uring_get_opcode(u8 opcode)
{
if (opcode < IORING_OP_LAST)
return io_issue_defs[opcode].name;
return io_cold_defs[opcode].name;
return "INVALID";
}
@ -544,12 +660,13 @@ void __init io_uring_optable_init(void)
{
int i;
BUILD_BUG_ON(ARRAY_SIZE(io_cold_defs) != IORING_OP_LAST);
BUILD_BUG_ON(ARRAY_SIZE(io_issue_defs) != IORING_OP_LAST);
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);
WARN_ON_ONCE(!io_issue_defs[i].name);
WARN_ON_ONCE(!io_cold_defs[i].name);
}
}

9
io_uring/opdef.h
View File

@ -29,19 +29,24 @@ struct io_issue_def {
unsigned iopoll_queue : 1;
/* opcode specific path will handle ->async_data allocation if needed */
unsigned manual_alloc : 1;
int (*issue)(struct io_kiocb *, unsigned int);
int (*prep)(struct io_kiocb *, const struct io_uring_sqe *);
};
struct io_cold_def {
/* size of async data needed, if any */
unsigned short async_size;
const char *name;
int (*prep)(struct io_kiocb *, const struct io_uring_sqe *);
int (*issue)(struct io_kiocb *, unsigned int);
int (*prep_async)(struct io_kiocb *);
void (*cleanup)(struct io_kiocb *);
void (*fail)(struct io_kiocb *);
};
extern const struct io_issue_def io_issue_defs[];
extern const struct io_cold_def io_cold_defs[];
void io_uring_optable_init(void);
#endif

2
io_uring/rw.c
View File

@ -516,7 +516,7 @@ static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec,
static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec,
struct io_rw_state *s, bool force)
{
if (!force && !io_issue_defs[req->opcode].prep_async)
if (!force && !io_cold_defs[req->opcode].prep_async)
return 0;
if (!req_has_async_data(req)) {
struct io_async_rw *iorw;