torvalds/linux
torvalds/linux
2
0
Fork 0
mirror of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2025-09-04 20:19:47 +08:00
Code
19f7e94273
linux/io_uring/opdef.c
Jens Axboe 19f7e94273 io_uring/epoll: add support for IORING_OP_EPOLL_WAIT 
For existing epoll event loops that can't fully convert to io_uring,
the used approach is usually to add the io_uring fd to the epoll
instance and use epoll_wait() to wait on both "legacy" and io_uring
events. While this work, it isn't optimal as:

1) epoll_wait() is pretty limited in what it can do. It does not support
   partial reaping of events, or waiting on a batch of events.

2) When an io_uring ring is added to an epoll instance, it activates the
   io_uring "I'm being polled" logic which slows things down.

Rather than use this approach, with EPOLL_WAIT support added to io_uring,
event loops can use the normal io_uring wait logic for everything, as
long as an epoll wait request has been armed with io_uring.

Note that IORING_OP_EPOLL_WAIT does NOT take a timeout value, as this
is an async request. Waiting on io_uring events in general has various
timeout parameters, and those are the ones that should be used when
waiting on any kind of request. If events are immediately available for
reaping, then This opcode will return those immediately. If none are
available, then it will post an async completion when they become
available.

cqe->res will contain either an error code (< 0 value) for a malformed
request, invalid epoll instance, etc. It will return a positive result
indicating how many events were reaped.

IORING_OP_EPOLL_WAIT requests may be canceled using the normal io_uring
cancelation infrastructure.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
2025-02-20 07:59:56 -07:00

809 lines
17 KiB
C
Raw Blame History

// 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 <linux/io_uring/cmd.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"
#include "waitid.h"
#include "futex.h"
#include "truncate.h"
#include "zcrx.h"
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;
}
const struct io_issue_def io_issue_defs[] = {
[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,
.iopoll_queue = 1,
.vectored = 1,
.async_size = sizeof(struct io_async_rw),
.prep = io_prep_readv,
.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,
.iopoll_queue = 1,
.vectored = 1,
.async_size = sizeof(struct io_async_rw),
.prep = io_prep_writev,
.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,
.iopoll_queue = 1,
.async_size = sizeof(struct io_async_rw),
.prep = io_prep_read_fixed,
.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,
.iopoll_queue = 1,
.async_size = sizeof(struct io_async_rw),
.prep = io_prep_write_fixed,
.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,
#if defined(CONFIG_NET)
.async_size = sizeof(struct io_async_msghdr),
.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,
#if defined(CONFIG_NET)
.async_size = sizeof(struct io_async_msghdr),
.prep = io_recvmsg_prep,
.issue = io_recvmsg,
#else
.prep = io_eopnotsupp_prep,
#endif
},
[IORING_OP_TIMEOUT] = {
.audit_skip = 1,
.async_size = sizeof(struct io_timeout_data),
.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,
.async_size = sizeof(struct io_timeout_data),
.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)
.async_size = sizeof(struct io_async_msghdr),
.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,
},
[IORING_OP_FILES_UPDATE] = {
.audit_skip = 1,
.iopoll = 1,
.prep = io_files_update_prep,
.issue = io_files_update,
},
[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,
.iopoll_queue = 1,
.async_size = sizeof(struct io_async_rw),
.prep = io_prep_read,
.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,
.iopoll_queue = 1,
.async_size = sizeof(struct io_async_rw),
.prep = io_prep_write,
.issue = io_write,
},
[IORING_OP_FADVISE] = {
.needs_file = 1,
.audit_skip = 1,
.prep = io_fadvise_prep,
.issue = io_fadvise,
},
[IORING_OP_MADVISE] = {
.audit_skip = 1,
.prep = io_madvise_prep,
.issue = io_madvise,
},
[IORING_OP_SEND] = {
.needs_file = 1,
.unbound_nonreg_file = 1,
.pollout = 1,
.audit_skip = 1,
.ioprio = 1,
.buffer_select = 1,
#if defined(CONFIG_NET)
.async_size = sizeof(struct io_async_msghdr),
.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)
.async_size = sizeof(struct io_async_msghdr),
.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,
.iopoll = 1,
.iopoll_queue = 1,
.async_size = sizeof(struct io_uring_cmd_data),
.prep = io_uring_cmd_prep,
.issue = io_uring_cmd,
},
[IORING_OP_SEND_ZC] = {
.needs_file = 1,
.unbound_nonreg_file = 1,
.pollout = 1,
.audit_skip = 1,
.ioprio = 1,
#if defined(CONFIG_NET)
.async_size = sizeof(struct io_async_msghdr),
.prep = io_send_zc_prep,
.issue = io_send_zc,
#else
.prep = io_eopnotsupp_prep,
#endif
},
[IORING_OP_SENDMSG_ZC] = {
.needs_file = 1,
.unbound_nonreg_file = 1,
.pollout = 1,
.ioprio = 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
},
[IORING_OP_READ_MULTISHOT] = {
.needs_file = 1,
.unbound_nonreg_file = 1,
.pollin = 1,
.buffer_select = 1,
.audit_skip = 1,
.async_size = sizeof(struct io_async_rw),
.prep = io_read_mshot_prep,
.issue = io_read_mshot,
},
[IORING_OP_WAITID] = {
.async_size = sizeof(struct io_waitid_async),
.prep = io_waitid_prep,
.issue = io_waitid,
},
[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,
#endif
},
[IORING_OP_FUTEX_WAITV] = {
#if defined(CONFIG_FUTEX)
.prep = io_futexv_prep,
.issue = io_futexv_wait,
#else
.prep = io_eopnotsupp_prep,
#endif
},
[IORING_OP_FIXED_FD_INSTALL] = {
.needs_file = 1,
.prep = io_install_fixed_fd_prep,
.issue = io_install_fixed_fd,
},
[IORING_OP_FTRUNCATE] = {
.needs_file = 1,
.hash_reg_file = 1,
.prep = io_ftruncate_prep,
.issue = io_ftruncate,
},
[IORING_OP_BIND] = {
#if defined(CONFIG_NET)
.needs_file = 1,
.prep = io_bind_prep,
.issue = io_bind,
.async_size = sizeof(struct io_async_msghdr),
#else
.prep = io_eopnotsupp_prep,
#endif
},
[IORING_OP_LISTEN] = {
#if defined(CONFIG_NET)
.needs_file = 1,
.prep = io_listen_prep,
.issue = io_listen,
.async_size = sizeof(struct io_async_msghdr),
#else
.prep = io_eopnotsupp_prep,
#endif
},
[IORING_OP_RECV_ZC] = {
.needs_file = 1,
.unbound_nonreg_file = 1,
.pollin = 1,
.ioprio = 1,
#if defined(CONFIG_NET)
.prep = io_recvzc_prep,
.issue = io_recvzc,
#else
.prep = io_eopnotsupp_prep,
#endif
},
[IORING_OP_EPOLL_WAIT] = {
.needs_file = 1,
.audit_skip = 1,
.pollin = 1,
#if defined(CONFIG_EPOLL)
.prep = io_epoll_wait_prep,
.issue = io_epoll_wait,
#else
.prep = io_eopnotsupp_prep,
#endif
},
};
const struct io_cold_def io_cold_defs[] = {
[IORING_OP_NOP] = {
.name = "NOP",
},
[IORING_OP_READV] = {
.name = "READV",
.cleanup = io_readv_writev_cleanup,
.fail = io_rw_fail,
},
[IORING_OP_WRITEV] = {
.name = "WRITEV",
.cleanup = io_readv_writev_cleanup,
.fail = io_rw_fail,
},
[IORING_OP_FSYNC] = {
.name = "FSYNC",
},
[IORING_OP_READ_FIXED] = {
.name = "READ_FIXED",
.cleanup = io_readv_writev_cleanup,
.fail = io_rw_fail,
},
[IORING_OP_WRITE_FIXED] = {
.name = "WRITE_FIXED",
.cleanup = io_readv_writev_cleanup,
.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)
.cleanup = io_sendmsg_recvmsg_cleanup,
.fail = io_sendrecv_fail,
#endif
},
[IORING_OP_RECVMSG] = {
.name = "RECVMSG",
#if defined(CONFIG_NET)
.cleanup = io_sendmsg_recvmsg_cleanup,
.fail = io_sendrecv_fail,
#endif
},
[IORING_OP_TIMEOUT] = {
.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] = {
.name = "LINK_TIMEOUT",
},
[IORING_OP_CONNECT] = {
.name = "CONNECT",
},
[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] = {
.name = "READ",
.cleanup = io_readv_writev_cleanup,
.fail = io_rw_fail,
},
[IORING_OP_WRITE] = {
.name = "WRITE",
.cleanup = io_readv_writev_cleanup,
.fail = io_rw_fail,
},
[IORING_OP_FADVISE] = {
.name = "FADVISE",
},
[IORING_OP_MADVISE] = {
.name = "MADVISE",
},
[IORING_OP_SEND] = {
.name = "SEND",
#if defined(CONFIG_NET)
.cleanup = io_sendmsg_recvmsg_cleanup,
.fail = io_sendrecv_fail,
#endif
},
[IORING_OP_RECV] = {
.name = "RECV",
#if defined(CONFIG_NET)
.cleanup = io_sendmsg_recvmsg_cleanup,
.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",
.cleanup = io_splice_cleanup,
},
[IORING_OP_PROVIDE_BUFFERS] = {
.name = "PROVIDE_BUFFERS",
},
[IORING_OP_REMOVE_BUFFERS] = {
.name = "REMOVE_BUFFERS",
},
[IORING_OP_TEE] = {
.name = "TEE",
.cleanup = io_splice_cleanup,
},
[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",
},
[IORING_OP_SEND_ZC] = {
.name = "SEND_ZC",
#if defined(CONFIG_NET)
.cleanup = io_send_zc_cleanup,
.fail = io_sendrecv_fail,
#endif
},
[IORING_OP_SENDMSG_ZC] = {
.name = "SENDMSG_ZC",
#if defined(CONFIG_NET)
.cleanup = io_send_zc_cleanup,
.fail = io_sendrecv_fail,
#endif
},
[IORING_OP_READ_MULTISHOT] = {
.name = "READ_MULTISHOT",
.cleanup = io_readv_writev_cleanup,
},
[IORING_OP_WAITID] = {
.name = "WAITID",
},
[IORING_OP_FUTEX_WAIT] = {
.name = "FUTEX_WAIT",
},
[IORING_OP_FUTEX_WAKE] = {
.name = "FUTEX_WAKE",
},
[IORING_OP_FUTEX_WAITV] = {
.name = "FUTEX_WAITV",
},
[IORING_OP_FIXED_FD_INSTALL] = {
.name = "FIXED_FD_INSTALL",
},
[IORING_OP_FTRUNCATE] = {
.name = "FTRUNCATE",
},
[IORING_OP_BIND] = {
.name = "BIND",
},
[IORING_OP_LISTEN] = {
.name = "LISTEN",
},
[IORING_OP_RECV_ZC] = {
.name = "RECV_ZC",
},
[IORING_OP_EPOLL_WAIT] = {
.name = "EPOLL_WAIT",
},
};
const char *io_uring_get_opcode(u8 opcode)
{
if (opcode < IORING_OP_LAST)
return io_cold_defs[opcode].name;
return "INVALID";
}
bool io_uring_op_supported(u8 opcode)
{
if (opcode < IORING_OP_LAST &&
io_issue_defs[opcode].prep != io_eopnotsupp_prep)
return true;
return false;
}
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_cold_defs[i].name);
}
}
View Git Blame Copy Permalink