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io_uring: clean up ->files grabbing 

Move work.files grabbing into io_prep_async_work() to all other work
resources initialisation. We don't need to keep it separately now, as
->ring_fd/file are gone. It also allows to not grab it when a request
is not going to io-wq.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-10-10 18:34:06 +01:00 committed by Jens Axboe
parent 5bf5e464f1
commit 233295130e
1 changed files with 13 additions and 39 deletions
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52
fs/io_uring.c
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@ -967,7 +967,6 @@ static void io_queue_linked_timeout(struct io_kiocb *req);
static int __io_sqe_files_update(struct io_ring_ctx *ctx,
struct io_uring_files_update *ip,
unsigned nr_args);
static int io_prep_work_files(struct io_kiocb *req);
static void __io_clean_op(struct io_kiocb *req);
static int io_file_get(struct io_submit_state *state, struct io_kiocb *req,
int fd, struct file **out_file, bool fixed);
@ -1222,16 +1221,28 @@ static bool io_req_clean_work(struct io_kiocb *req)
static void io_prep_async_work(struct io_kiocb *req)
{
const struct io_op_def *def = &io_op_defs[req->opcode];
struct io_ring_ctx *ctx = req->ctx;
io_req_init_async(req);
if (req->flags & REQ_F_ISREG) {
if (def->hash_reg_file || (req->ctx->flags & IORING_SETUP_IOPOLL))
if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL))
io_wq_hash_work(&req->work, file_inode(req->file));
} else {
if (def->unbound_nonreg_file)
req->work.flags |= IO_WQ_WORK_UNBOUND;
}
if (!req->work.files && io_op_defs[req->opcode].file_table &&
!(req->flags & REQ_F_NO_FILE_TABLE)) {
req->work.files = get_files_struct(current);
get_nsproxy(current->nsproxy);
req->work.nsproxy = current->nsproxy;
req->flags |= REQ_F_INFLIGHT;
spin_lock_irq(&ctx->inflight_lock);
list_add(&req->inflight_entry, &ctx->inflight_list);
spin_unlock_irq(&ctx->inflight_lock);
}
if (!req->work.mm && def->needs_mm) {
mmgrab(current->mm);
req->work.mm = current->mm;
@ -5662,16 +5673,10 @@ static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
static int io_req_defer_prep(struct io_kiocb *req,
const struct io_uring_sqe *sqe)
{
int ret;
if (!sqe)
return 0;
if (io_alloc_async_data(req))
return -EAGAIN;
ret = io_prep_work_files(req);
if (unlikely(ret))
return ret;
return io_req_prep(req, sqe);
}
@ -6015,33 +6020,6 @@ static int io_req_set_file(struct io_submit_state *state, struct io_kiocb *req,
return io_file_get(state, req, fd, &req->file, fixed);
}
static int io_grab_files(struct io_kiocb *req)
{
struct io_ring_ctx *ctx = req->ctx;
io_req_init_async(req);
if (req->work.files || (req->flags & REQ_F_NO_FILE_TABLE))
return 0;
req->work.files = get_files_struct(current);
get_nsproxy(current->nsproxy);
req->work.nsproxy = current->nsproxy;
req->flags |= REQ_F_INFLIGHT;
spin_lock_irq(&ctx->inflight_lock);
list_add(&req->inflight_entry, &ctx->inflight_list);
spin_unlock_irq(&ctx->inflight_lock);
return 0;
}
static inline int io_prep_work_files(struct io_kiocb *req)
{
if (!io_op_defs[req->opcode].file_table)
return 0;
return io_grab_files(req);
}
static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer)
{
struct io_timeout_data *data = container_of(timer,
@ -6153,9 +6131,6 @@ static void __io_queue_sqe(struct io_kiocb *req, struct io_comp_state *cs)
if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) {
if (!io_arm_poll_handler(req)) {
punt:
ret = io_prep_work_files(req);
if (unlikely(ret))
goto err;
/*
* Queued up for async execution, worker will release
* submit reference when the iocb is actually submitted.
@ -6169,7 +6144,6 @@ static void __io_queue_sqe(struct io_kiocb *req, struct io_comp_state *cs)
}
if (unlikely(ret)) {
err:
/* un-prep timeout, so it'll be killed as any other linked */
req->flags &= ~REQ_F_LINK_TIMEOUT;
req_set_fail_links(req);