linux-kernel - [PATCH 110/437] fs/pstore: convert to read/write iterators

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Date: Thu, 11 Apr 2024 09:14:10 -0600
From: Jens Axboe <axboe@...nel.dk>
To: linux-kernel@...r.kernel.org
Cc: Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 110/437] fs/pstore: convert to read/write iterators

Signed-off-by: Jens Axboe <axboe@...nel.dk>
---
 fs/pstore/ftrace.c | 16 ++++++++--------
 fs/pstore/inode.c  | 13 ++++++-------
 fs/pstore/pmsg.c   |  3 ++-
 3 files changed, 16 insertions(+), 16 deletions(-)

diff --git a/fs/pstore/ftrace.c b/fs/pstore/ftrace.c
index 776cae20af4e..8c7244df7787 100644
--- a/fs/pstore/ftrace.c
+++ b/fs/pstore/ftrace.c
@@ -88,13 +88,14 @@ static int pstore_set_ftrace_enabled(bool on)
 	return ret;
 }
 
-static ssize_t pstore_ftrace_knob_write(struct file *f, const char __user *buf,
-					size_t count, loff_t *ppos)
+static ssize_t pstore_ftrace_knob_write(struct kiocb *iocb,
+					struct iov_iter *from)
 {
+	size_t count = iov_iter_count(from);
 	u8 on;
 	ssize_t ret;
 
-	ret = kstrtou8_from_user(buf, count, 2, &on);
+	ret = kstrtou8_from_iter(from, count, 2, &on);
 	if (ret)
 		return ret;
 
@@ -108,18 +109,17 @@ static ssize_t pstore_ftrace_knob_write(struct file *f, const char __user *buf,
 	return ret;
 }
 
-static ssize_t pstore_ftrace_knob_read(struct file *f, char __user *buf,
-				       size_t count, loff_t *ppos)
+static ssize_t pstore_ftrace_knob_read(struct kiocb *iocb, struct iov_iter *to)
 {
 	char val[] = { '0' + pstore_ftrace_enabled, '\n' };
 
-	return simple_read_from_buffer(buf, count, ppos, val, sizeof(val));
+	return simple_copy_to_iter(val, &iocb->ki_pos, sizeof(val), to);
 }
 
 static const struct file_operations pstore_knob_fops = {
 	.open	= simple_open,
-	.read	= pstore_ftrace_knob_read,
-	.write	= pstore_ftrace_knob_write,
+	.read_iter	= pstore_ftrace_knob_read,
+	.write_iter	= pstore_ftrace_knob_write,
 };
 
 static struct dentry *pstore_ftrace_dir;
diff --git a/fs/pstore/inode.c b/fs/pstore/inode.c
index 56815799ce79..581f014149a9 100644
--- a/fs/pstore/inode.c
+++ b/fs/pstore/inode.c
@@ -127,16 +127,15 @@ static const struct seq_operations pstore_ftrace_seq_ops = {
 	.show	= pstore_ftrace_seq_show,
 };
 
-static ssize_t pstore_file_read(struct file *file, char __user *userbuf,
-						size_t count, loff_t *ppos)
+static ssize_t pstore_file_read(struct kiocb *iocb, struct iov_iter *to)
 {
-	struct seq_file *sf = file->private_data;
+	struct seq_file *sf = iocb->ki_filp->private_data;
 	struct pstore_private *ps = sf->private;
 
 	if (ps->record->type == PSTORE_TYPE_FTRACE)
-		return seq_read(file, userbuf, count, ppos);
-	return simple_read_from_buffer(userbuf, count, ppos,
-				       ps->record->buf, ps->total_size);
+		return seq_read_iter(iocb, to);
+	return simple_copy_to_iter(ps->record->buf, &iocb->ki_pos,
+					ps->total_size, to);
 }
 
 static int pstore_file_open(struct inode *inode, struct file *file)
@@ -170,7 +169,7 @@ static loff_t pstore_file_llseek(struct file *file, loff_t off, int whence)
 
 static const struct file_operations pstore_file_operations = {
 	.open		= pstore_file_open,
-	.read		= pstore_file_read,
+	.read_iter	= pstore_file_read,
 	.llseek		= pstore_file_llseek,
 	.release	= seq_release,
 };
diff --git a/fs/pstore/pmsg.c b/fs/pstore/pmsg.c
index 55f139afa327..83fef50ecce5 100644
--- a/fs/pstore/pmsg.c
+++ b/fs/pstore/pmsg.c
@@ -33,11 +33,12 @@ static ssize_t write_pmsg(struct file *file, const char __user *buf,
 	mutex_unlock(&pmsg_lock);
 	return ret ? ret : count;
 }
+FOPS_WRITE_ITER_HELPER(write_pmsg);
 
 static const struct file_operations pmsg_fops = {
 	.owner		= THIS_MODULE,
 	.llseek		= noop_llseek,
-	.write		= write_pmsg,
+	.write_iter	= write_pmsg_iter,
 };
 
 static struct class *pmsg_class;
-- 
2.43.0