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From: Jens Axboe <[email protected]>
To: [email protected]
Cc: Jens Axboe <[email protected]>
Subject: [PATCH 16/18] io_uring: store io_identity in io_uring_task
Date: Fri, 16 Oct 2020 10:02:22 -0600	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

This is, by definition, a per-task structure. So store it in the
task context, instead of doing carrying it in each io_kiocb. We're being
a bit inefficient if members have changed, as that requires an alloc and
copy of a new io_identity struct. The next patch will fix that up.

Signed-off-by: Jens Axboe <[email protected]>
---
 fs/io_uring.c            | 21 +++++++++++----------
 include/linux/io_uring.h |  1 +
 2 files changed, 12 insertions(+), 10 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 3a85b8348135..bc16327a6481 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -689,7 +689,6 @@ struct io_kiocb {
 	struct hlist_node		hash_node;
 	struct async_poll		*apoll;
 	struct io_wq_work		work;
-	struct io_identity		identity;
 };
 
 struct io_defer_entry {
@@ -1072,8 +1071,7 @@ static inline void io_req_init_async(struct io_kiocb *req)
 
 	memset(&req->work, 0, sizeof(req->work));
 	req->flags |= REQ_F_WORK_INITIALIZED;
-	io_init_identity(&req->identity);
-	req->work.identity = &req->identity;
+	req->work.identity = &current->io_uring->identity;
 }
 
 static inline bool io_async_submit(struct io_ring_ctx *ctx)
@@ -1179,9 +1177,9 @@ static void __io_commit_cqring(struct io_ring_ctx *ctx)
 	}
 }
 
-static void io_put_identity(struct io_kiocb *req)
+static void io_put_identity(struct io_uring_task *tctx, struct io_kiocb *req)
 {
-	if (req->work.identity == &req->identity)
+	if (req->work.identity == &tctx->identity)
 		return;
 	if (refcount_dec_and_test(&req->work.identity->count))
 		kfree(req->work.identity);
@@ -1220,7 +1218,7 @@ static void io_req_clean_work(struct io_kiocb *req)
 		req->work.flags &= ~IO_WQ_WORK_FS;
 	}
 
-	io_put_identity(req);
+	io_put_identity(req->task->io_uring, req);
 }
 
 /*
@@ -1229,6 +1227,7 @@ static void io_req_clean_work(struct io_kiocb *req)
  */
 static bool io_identity_cow(struct io_kiocb *req)
 {
+	struct io_uring_task *tctx = current->io_uring;
 	const struct cred *creds = NULL;
 	struct io_identity *id;
 
@@ -1255,7 +1254,7 @@ static bool io_identity_cow(struct io_kiocb *req)
 	refcount_inc(&id->count);
 
 	/* drop old identity, assign new one. one ref for req, one for tctx */
-	if (req->work.identity != &req->identity &&
+	if (req->work.identity != &tctx->identity &&
 	    refcount_sub_and_test(2, &req->work.identity->count))
 		kfree(req->work.identity);
 
@@ -1266,7 +1265,7 @@ static bool io_identity_cow(struct io_kiocb *req)
 static bool io_grab_identity(struct io_kiocb *req)
 {
 	const struct io_op_def *def = &io_op_defs[req->opcode];
-	struct io_identity *id = &req->identity;
+	struct io_identity *id = req->work.identity;
 	struct io_ring_ctx *ctx = req->ctx;
 
 	if (def->needs_fsize && id->fsize != rlimit(RLIMIT_FSIZE))
@@ -1330,10 +1329,11 @@ static bool io_grab_identity(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_identity *id = &req->identity;
 	struct io_ring_ctx *ctx = req->ctx;
+	struct io_identity *id;
 
 	io_req_init_async(req);
+	id = req->work.identity;
 
 	if (req->flags & REQ_F_ISREG) {
 		if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL))
@@ -6474,7 +6474,7 @@ static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req,
 		if (unlikely(!iod))
 			return -EINVAL;
 		refcount_inc(&iod->count);
-		io_put_identity(req);
+		io_put_identity(current->io_uring, req);
 		get_cred(iod->creds);
 		req->work.identity = iod;
 		req->work.flags |= IO_WQ_WORK_CREDS;
@@ -7684,6 +7684,7 @@ static int io_uring_alloc_task_context(struct task_struct *task)
 	tctx->in_idle = 0;
 	atomic_long_set(&tctx->req_issue, 0);
 	atomic_long_set(&tctx->req_complete, 0);
+	io_init_identity(&tctx->identity);
 	task->io_uring = tctx;
 	return 0;
 }
diff --git a/include/linux/io_uring.h b/include/linux/io_uring.h
index 342cc574d5c0..bd3346194bca 100644
--- a/include/linux/io_uring.h
+++ b/include/linux/io_uring.h
@@ -24,6 +24,7 @@ struct io_uring_task {
 	struct wait_queue_head	wait;
 	struct file		*last;
 	atomic_long_t		req_issue;
+	struct io_identity	identity;
 
 	/* completion side */
 	bool			in_idle ____cacheline_aligned_in_smp;
-- 
2.28.0


  parent reply	other threads:[~2020-10-16 16:02 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-16 16:02 [PATCHES 0/10] Fixes queued up for 5.10 Jens Axboe
2020-10-16 16:02 ` [PATCH 01/18] io_uring: Fix sizeof() mismatch Jens Axboe
2020-10-16 16:02 ` [PATCH 02/18] readahead: use limited read-ahead to satisfy read Jens Axboe
2020-10-16 16:02 ` [PATCH 03/18] io_uring: don't clear IOCB_NOWAIT for async buffered retry Jens Axboe
2020-10-16 16:02 ` [PATCH 04/18] io_uring: don't set COMP_LOCKED if won't put Jens Axboe
2020-10-16 16:02 ` [PATCH 05/18] io_uring: don't unnecessarily clear F_LINK_TIMEOUT Jens Axboe
2020-10-16 16:02 ` [PATCH 06/18] io_uring: don't put a poll req under spinlock Jens Axboe
2020-10-16 16:02 ` [PATCH 07/18] io_uring: dig out COMP_LOCK from deep call chain Jens Axboe
2020-10-16 16:02 ` [PATCH 08/18] io_uring: fix REQ_F_COMP_LOCKED by killing it Jens Axboe
2020-10-16 16:02 ` [PATCH 09/18] Revert "io_uring: mark io_uring_fops/io_op_defs as __read_mostly" Jens Axboe
2020-10-16 16:02 ` [PATCH 10/18] io_uring: fix error path cleanup in io_sqe_files_register() Jens Axboe
2020-10-16 16:02 ` [PATCH 11/18] io-wq: assign NUMA node locality if appropriate Jens Axboe
2020-10-16 16:02 ` [PATCH 12/18] io_uring: pass required context in as flags Jens Axboe
2020-10-16 16:02 ` [PATCH 13/18] io_uring: rely solely on work flags to determine personality Jens Axboe
2020-10-16 16:02 ` [PATCH 14/18] io_uring: move io identity items into separate struct Jens Axboe
2020-10-16 16:02 ` [PATCH 15/18] io_uring: COW io_identity on mismatch Jens Axboe
2020-10-16 16:02 ` Jens Axboe [this message]
2020-10-16 16:02 ` [PATCH 17/18] io_uring: assign new io_identity for task if members have changed Jens Axboe
2020-10-16 16:02 ` [PATCH 18/18] io_uring: use percpu counters to track inflight requests Jens Axboe

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