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io_uring: move uring_cmd handling to its own file 

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2022-05-25 05:59:19 -06:00
parent cd40cae29e
commit 99f15d8d61
5 changed files with 142 additions and 124 deletions
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2
io_uring/Makefile
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@ -4,5 +4,5 @@
obj-$(CONFIG_IO_URING) += io_uring.o xattr.o nop.o fs.o splice.o \
sync.o advise.o filetable.o \
openclose.o
openclose.o uring_cmd.o
obj-$(CONFIG_IO_WQ) += io-wq.o

127
io_uring/io_uring.c
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@ -99,6 +99,7 @@
#include "sync.h"
#include "advise.h"
#include "openclose.h"
#include "uring_cmd.h"
#define IORING_MAX_ENTRIES 32768
#define IORING_MAX_CQ_ENTRIES (2 * IORING_MAX_ENTRIES)
@ -473,14 +474,6 @@ struct io_cancel_data {
int seq;
};
/*
* The URING_CMD payload starts at 'cmd' in the first sqe, and continues into
* the following sqe if SQE128 is used.
*/
#define uring_cmd_pdu_size(is_sqe128) \
((1 + !!(is_sqe128)) * sizeof(struct io_uring_sqe) - \
offsetof(struct io_uring_sqe, cmd))
struct io_op_def {
/* needs req->file assigned */
unsigned needs_file : 1;
@ -988,11 +981,6 @@ static bool io_match_task_safe(struct io_kiocb *head, struct task_struct *task,
return matched;
}
static inline bool req_has_async_data(struct io_kiocb *req)
{
return req->flags & REQ_F_ASYNC_DATA;
}
static inline void req_fail_link_node(struct io_kiocb *req, int res)
{
req_set_fail(req);
@ -1743,7 +1731,7 @@ static void io_req_complete_post(struct io_kiocb *req)
io_cqring_ev_posted(ctx);
}
static inline void __io_req_complete(struct io_kiocb *req, unsigned issue_flags)
inline void __io_req_complete(struct io_kiocb *req, unsigned issue_flags)
{
if (issue_flags & IO_URING_F_COMPLETE_DEFER)
req->flags |= REQ_F_COMPLETE_INLINE;
@ -2151,7 +2139,7 @@ static void __io_req_task_work_add(struct io_kiocb *req,
}
}
static void io_req_task_work_add(struct io_kiocb *req)
void io_req_task_work_add(struct io_kiocb *req)
{
struct io_uring_task *tctx = req->task->io_uring;
@ -3268,7 +3256,7 @@ static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec,
}
}
static inline bool io_alloc_async_data(struct io_kiocb *req)
bool io_alloc_async_data(struct io_kiocb *req)
{
WARN_ON_ONCE(!io_op_defs[req->opcode].async_size);
req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL);
@ -3714,111 +3702,6 @@ static int io_write(struct io_kiocb *req, unsigned int issue_flags)
return ret;
}
static void io_uring_cmd_work(struct io_kiocb *req, bool *locked)
{
struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req);
ioucmd->task_work_cb(ioucmd);
}
void io_uring_cmd_complete_in_task(struct io_uring_cmd *ioucmd,
void (*task_work_cb)(struct io_uring_cmd *))
{
struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
ioucmd->task_work_cb = task_work_cb;
req->io_task_work.func = io_uring_cmd_work;
io_req_task_work_add(req);
}
EXPORT_SYMBOL_GPL(io_uring_cmd_complete_in_task);
static inline void io_req_set_cqe32_extra(struct io_kiocb *req,
u64 extra1, u64 extra2)
{
req->extra1 = extra1;
req->extra2 = extra2;
req->flags |= REQ_F_CQE32_INIT;
}
/*
* Called by consumers of io_uring_cmd, if they originally returned
* -EIOCBQUEUED upon receiving the command.
*/
void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2)
{
struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
if (ret < 0)
req_set_fail(req);
io_req_set_res(req, 0, ret);
if (req->ctx->flags & IORING_SETUP_CQE32)
io_req_set_cqe32_extra(req, res2, 0);
__io_req_complete(req, 0);
}
EXPORT_SYMBOL_GPL(io_uring_cmd_done);
static int io_uring_cmd_prep_async(struct io_kiocb *req)
{
struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req);
size_t cmd_size;
cmd_size = uring_cmd_pdu_size(req->ctx->flags & IORING_SETUP_SQE128);
memcpy(req->async_data, ioucmd->cmd, cmd_size);
return 0;
}
static int io_uring_cmd_prep(struct io_kiocb *req,
const struct io_uring_sqe *sqe)
{
struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req);
if (sqe->rw_flags || sqe->__pad1)
return -EINVAL;
ioucmd->cmd = sqe->cmd;
ioucmd->cmd_op = READ_ONCE(sqe->cmd_op);
return 0;
}
static int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags)
{
struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req);
struct io_ring_ctx *ctx = req->ctx;
struct file *file = req->file;
int ret;
if (!req->file->f_op->uring_cmd)
return -EOPNOTSUPP;
if (ctx->flags & IORING_SETUP_SQE128)
issue_flags |= IO_URING_F_SQE128;
if (ctx->flags & IORING_SETUP_CQE32)
issue_flags |= IO_URING_F_CQE32;
if (ctx->flags & IORING_SETUP_IOPOLL)
issue_flags |= IO_URING_F_IOPOLL;
if (req_has_async_data(req))
ioucmd->cmd = req->async_data;
ret = file->f_op->uring_cmd(ioucmd, issue_flags);
if (ret == -EAGAIN) {
if (!req_has_async_data(req)) {
if (io_alloc_async_data(req))
return -ENOMEM;
io_uring_cmd_prep_async(req);
}
return -EAGAIN;
}
if (ret != -EIOCBQUEUED) {
io_uring_cmd_done(ioucmd, ret, 0);
return IOU_OK;
}
return IOU_ISSUE_SKIP_COMPLETE;
}
static int io_msg_ring_prep(struct io_kiocb *req,
const struct io_uring_sqe *sqe)
{
@ -11533,8 +11416,6 @@ static int __init io_uring_init(void)
BUILD_BUG_ON(sizeof(atomic_t) != sizeof(u32));
BUILD_BUG_ON(sizeof(struct io_uring_cmd) > 64);
for (i = 0; i < ARRAY_SIZE(io_op_defs); i++) {
BUG_ON(!io_op_defs[i].prep);
BUG_ON(!io_op_defs[i].issue);

9
io_uring/io_uring.h
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@ -25,6 +25,11 @@ static inline void io_req_set_res(struct io_kiocb *req, s32 res, u32 cflags)
req->cqe.flags = cflags;
}
static inline bool req_has_async_data(struct io_kiocb *req)
{
return req->flags & REQ_F_ASYNC_DATA;
}
static inline void io_put_file(struct file *file)
{
if (file)
@ -53,6 +58,8 @@ static inline void io_ring_submit_lock(struct io_ring_ctx *ctx,
lockdep_assert_held(&ctx->uring_lock);
}
void __io_req_complete(struct io_kiocb *req, unsigned issue_flags);
struct file *io_file_get_normal(struct io_kiocb *req, int fd);
struct file *io_file_get_fixed(struct io_kiocb *req, int fd,
unsigned issue_flags);
@ -65,5 +72,7 @@ int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx,
void io_rsrc_node_switch(struct io_ring_ctx *ctx,
struct io_rsrc_data *data_to_kill);
bool io_is_uring_fops(struct file *file);
bool io_alloc_async_data(struct io_kiocb *req);
void io_req_task_work_add(struct io_kiocb *req);
#endif

115
io_uring/uring_cmd.c Normal file
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@ -0,0 +1,115 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/file.h>
#include <linux/io_uring.h>
#include <uapi/linux/io_uring.h>
#include "io_uring_types.h"
#include "io_uring.h"
#include "uring_cmd.h"
static void io_uring_cmd_work(struct io_kiocb *req, bool *locked)
{
struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req);
ioucmd->task_work_cb(ioucmd);
}
void io_uring_cmd_complete_in_task(struct io_uring_cmd *ioucmd,
void (*task_work_cb)(struct io_uring_cmd *))
{
struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
ioucmd->task_work_cb = task_work_cb;
req->io_task_work.func = io_uring_cmd_work;
io_req_task_work_add(req);
}
EXPORT_SYMBOL_GPL(io_uring_cmd_complete_in_task);
static inline void io_req_set_cqe32_extra(struct io_kiocb *req,
u64 extra1, u64 extra2)
{
req->extra1 = extra1;
req->extra2 = extra2;
req->flags |= REQ_F_CQE32_INIT;
}
/*
* Called by consumers of io_uring_cmd, if they originally returned
* -EIOCBQUEUED upon receiving the command.
*/
void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2)
{
struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
if (ret < 0)
req_set_fail(req);
io_req_set_res(req, 0, ret);
if (req->ctx->flags & IORING_SETUP_CQE32)
io_req_set_cqe32_extra(req, res2, 0);
__io_req_complete(req, 0);
}
EXPORT_SYMBOL_GPL(io_uring_cmd_done);
int io_uring_cmd_prep_async(struct io_kiocb *req)
{
struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req);
size_t cmd_size;
cmd_size = uring_cmd_pdu_size(req->ctx->flags & IORING_SETUP_SQE128);
memcpy(req->async_data, ioucmd->cmd, cmd_size);
return 0;
}
int io_uring_cmd_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req);
if (sqe->rw_flags || sqe->__pad1)
return -EINVAL;
ioucmd->cmd = sqe->cmd;
ioucmd->cmd_op = READ_ONCE(sqe->cmd_op);
return 0;
}
int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags)
{
struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req);
struct io_ring_ctx *ctx = req->ctx;
struct file *file = req->file;
int ret;
if (!req->file->f_op->uring_cmd)
return -EOPNOTSUPP;
if (ctx->flags & IORING_SETUP_SQE128)
issue_flags |= IO_URING_F_SQE128;
if (ctx->flags & IORING_SETUP_CQE32)
issue_flags |= IO_URING_F_CQE32;
if (ctx->flags & IORING_SETUP_IOPOLL)
issue_flags |= IO_URING_F_IOPOLL;
if (req_has_async_data(req))
ioucmd->cmd = req->async_data;
ret = file->f_op->uring_cmd(ioucmd, issue_flags);
if (ret == -EAGAIN) {
if (!req_has_async_data(req)) {
if (io_alloc_async_data(req))
return -ENOMEM;
io_uring_cmd_prep_async(req);
}
return -EAGAIN;
}
if (ret != -EIOCBQUEUED) {
io_uring_cmd_done(ioucmd, ret, 0);
return IOU_OK;
}
return IOU_ISSUE_SKIP_COMPLETE;
}

13
io_uring/uring_cmd.h Normal file
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@ -0,0 +1,13 @@
// SPDX-License-Identifier: GPL-2.0
int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags);
int io_uring_cmd_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
int io_uring_cmd_prep_async(struct io_kiocb *req);
/*
* The URING_CMD payload starts at 'cmd' in the first sqe, and continues into
* the following sqe if SQE128 is used.
*/
#define uring_cmd_pdu_size(is_sqe128) \
((1 + !!(is_sqe128)) * sizeof(struct io_uring_sqe) - \
offsetof(struct io_uring_sqe, cmd))