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Date: Fri, 23 Feb 2024 17:17:07 -0800
Subject: [PATCH 3/5] thread_with_file: create ops structure for
 thread_with_stdio
From: "Darrick J. Wong" <djwong@kernel.org>
To: akpm@linux-foundation.org, daniel@gluo.nz, kent.overstreet@linux.dev,
 djwong@kernel.org
Cc: linux-xfs@vger.kernel.org, linux-bcachefs@vger.kernel.org,
 linux-kernel@vger.kernel.org
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From: Darrick J. Wong <djwong@kernel.org>

Create an ops structure so we can add more file-based functionality in
the next few patches.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
---
 fs/bcachefs/chardev.c            |   18 ++++++++++++------
 include/linux/thread_with_file.h |   16 ++++++++++------
 lib/thread_with_file.c           |   16 ++++++----------
 3 files changed, 28 insertions(+), 22 deletions(-)


diff --git a/fs/bcachefs/chardev.c b/fs/bcachefs/chardev.c
index 4cbda66bb6e0f..a2f30f45f93f7 100644
--- a/fs/bcachefs/chardev.c
+++ b/fs/bcachefs/chardev.c
@@ -165,6 +165,11 @@ static void bch2_fsck_offline_thread_fn(struct thread_with_stdio *stdio)
 		bch2_fs_stop(c);
 }
 
+static const struct thread_with_stdio_ops bch2_offline_fsck_ops = {
+	.exit		= bch2_fsck_thread_exit,
+	.fn		= bch2_fsck_offline_thread_fn,
+};
+
 static long bch2_ioctl_fsck_offline(struct bch_ioctl_fsck_offline __user *user_arg)
 {
 	struct bch_ioctl_fsck_offline arg;
@@ -217,9 +222,7 @@ static long bch2_ioctl_fsck_offline(struct bch_ioctl_fsck_offline __user *user_a
 
 	opt_set(thr->opts, stdio, (u64)(unsigned long)&thr->thr.stdio);
 
-	ret = run_thread_with_stdio(&thr->thr,
-			bch2_fsck_thread_exit,
-			bch2_fsck_offline_thread_fn);
+	ret = run_thread_with_stdio(&thr->thr, &bch2_offline_fsck_ops);
 err:
 	if (ret < 0) {
 		if (thr)
@@ -794,6 +797,11 @@ static void bch2_fsck_online_thread_fn(struct thread_with_stdio *stdio)
 	bch2_ro_ref_put(c);
 }
 
+static const struct thread_with_stdio_ops bch2_online_fsck_ops = {
+	.exit		= bch2_fsck_thread_exit,
+	.fn		= bch2_fsck_online_thread_fn,
+};
+
 static long bch2_ioctl_fsck_online(struct bch_fs *c,
 				   struct bch_ioctl_fsck_online arg)
 {
@@ -834,9 +842,7 @@ static long bch2_ioctl_fsck_online(struct bch_fs *c,
 			goto err;
 	}
 
-	ret = run_thread_with_stdio(&thr->thr,
-			bch2_fsck_thread_exit,
-			bch2_fsck_online_thread_fn);
+	ret = run_thread_with_stdio(&thr->thr, &bch2_online_fsck_ops);
 err:
 	if (ret < 0) {
 		bch_err_fn(c, ret);
diff --git a/include/linux/thread_with_file.h b/include/linux/thread_with_file.h
index 7b133a15d3540..445b1b12a0bd6 100644
--- a/include/linux/thread_with_file.h
+++ b/include/linux/thread_with_file.h
@@ -52,19 +52,23 @@ int run_thread_with_file(struct thread_with_file *,
 			 const struct file_operations *,
 			 int (*fn)(void *));
 
+struct thread_with_stdio;
+
+struct thread_with_stdio_ops {
+	void (*exit)(struct thread_with_stdio *);
+	void (*fn)(struct thread_with_stdio *);
+};
+
 struct thread_with_stdio {
 	struct thread_with_file	thr;
 	struct stdio_redirect	stdio;
-	void			(*exit)(struct thread_with_stdio *);
-	void			(*fn)(struct thread_with_stdio *);
+	const struct thread_with_stdio_ops	*ops;
 };
 
 int run_thread_with_stdio(struct thread_with_stdio *,
-			  void (*exit)(struct thread_with_stdio *),
-			  void (*fn)(struct thread_with_stdio *));
+			  const struct thread_with_stdio_ops *);
 int run_thread_with_stdout(struct thread_with_stdio *,
-			  void (*exit)(struct thread_with_stdio *),
-			  void (*fn)(struct thread_with_stdio *));
+			  const struct thread_with_stdio_ops *);
 int stdio_redirect_read(struct stdio_redirect *, char *, size_t);
 int stdio_redirect_readline(struct stdio_redirect *, char *, size_t);
 
diff --git a/lib/thread_with_file.c b/lib/thread_with_file.c
index 70a805ef017f9..2edf33c3e7dc5 100644
--- a/lib/thread_with_file.c
+++ b/lib/thread_with_file.c
@@ -359,7 +359,7 @@ static int thread_with_stdio_release(struct inode *inode, struct file *file)
 	thread_with_file_exit(&thr->thr);
 	darray_exit(&thr->stdio.input.buf);
 	darray_exit(&thr->stdio.output.buf);
-	thr->exit(thr);
+	thr->ops->exit(thr);
 	return 0;
 }
 
@@ -398,33 +398,29 @@ static int thread_with_stdio_fn(void *arg)
 {
 	struct thread_with_stdio *thr = arg;
 
-	thr->fn(thr);
+	thr->ops->fn(thr);
 
 	thread_with_stdio_done(thr);
 	return 0;
 }
 
 int run_thread_with_stdio(struct thread_with_stdio *thr,
-			  void (*exit)(struct thread_with_stdio *),
-			  void (*fn)(struct thread_with_stdio *))
+			  const struct thread_with_stdio_ops *ops)
 {
 	stdio_buf_init(&thr->stdio.input);
 	stdio_buf_init(&thr->stdio.output);
-	thr->exit	= exit;
-	thr->fn		= fn;
+	thr->ops = ops;
 
 	return run_thread_with_file(&thr->thr, &thread_with_stdio_fops, thread_with_stdio_fn);
 }
 EXPORT_SYMBOL_GPL(run_thread_with_stdio);
 
 int run_thread_with_stdout(struct thread_with_stdio *thr,
-			  void (*exit)(struct thread_with_stdio *),
-			  void (*fn)(struct thread_with_stdio *))
+			   const struct thread_with_stdio_ops *ops)
 {
 	stdio_buf_init(&thr->stdio.input);
 	stdio_buf_init(&thr->stdio.output);
-	thr->exit	= exit;
-	thr->fn		= fn;
+	thr->ops = ops;
 
 	return run_thread_with_file(&thr->thr, &thread_with_stdout_fops, thread_with_stdio_fn);
 }