linux-kernel - [PATCH] io_uring: remove io_remove

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Date:   Wed, 23 Dec 2020 11:27:05 +0800
From:   Yejune Deng <yejune.deng@...il.com>
To:     viro@...iv.linux.org.uk, axboe@...nel.dk
Cc:     linux-fsdevel@...r.kernel.org, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org, yejune.deng@...il.com
Subject: [PATCH] io_uring: remove io_remove_personalities()

The function io_remove_personalities() is very similar to
io_unregister_personality(),but the latter has a more reasonable
return value.

Signed-off-by: Yejune Deng <yejune.deng@...il.com>
---
 fs/io_uring.c | 25 ++++++-------------------
 1 file changed, 6 insertions(+), 19 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index b749578..000ea9a 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -8608,7 +8608,7 @@ static int io_uring_fasync(int fd, struct file *file, int on)
 	return fasync_helper(fd, file, on, &ctx->cq_fasync);
 }
 
-static int io_remove_personalities(int id, void *p, void *data)
+static int io_unregister_personality(int id, void *p, void *data)
 {
 	struct io_ring_ctx *ctx = data;
 	struct io_identity *iod;
@@ -8618,8 +8618,10 @@ static int io_remove_personalities(int id, void *p, void *data)
 		put_cred(iod->creds);
 		if (refcount_dec_and_test(&iod->count))
 			kfree(iod);
+		return 0;
 	}
-	return 0;
+
+	return -EINVAL;
 }
 
 static void io_ring_exit_work(struct work_struct *work)
@@ -8657,7 +8659,7 @@ static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx)
 
 	/* if we failed setting up the ctx, we might not have any rings */
 	io_iopoll_try_reap_events(ctx);
-	idr_for_each(&ctx->personality_idr, io_remove_personalities, ctx);
+	idr_for_each(&ctx->personality_idr, io_unregister_personality, ctx);
 
 	/*
 	 * Do this upfront, so we won't have a grace period where the ring
@@ -9679,21 +9681,6 @@ static int io_register_personality(struct io_ring_ctx *ctx)
 	return ret;
 }
 
-static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id)
-{
-	struct io_identity *iod;
-
-	iod = idr_remove(&ctx->personality_idr, id);
-	if (iod) {
-		put_cred(iod->creds);
-		if (refcount_dec_and_test(&iod->count))
-			kfree(iod);
-		return 0;
-	}
-
-	return -EINVAL;
-}
-
 static int io_register_restrictions(struct io_ring_ctx *ctx, void __user *arg,
 				    unsigned int nr_args)
 {
@@ -9906,7 +9893,7 @@ static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode,
 		ret = -EINVAL;
 		if (arg)
 			break;
-		ret = io_unregister_personality(ctx, nr_args);
+		ret = io_unregister_personality(nr_args, NULL, ctx);
 		break;
 	case IORING_REGISTER_ENABLE_RINGS:
 		ret = -EINVAL;
-- 
1.9.1