linux-kernel - [PATCH 043/437] ecryptfs: miscdev: convert to read/write iterators

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Date: Thu, 11 Apr 2024 09:13:03 -0600
From: Jens Axboe <axboe@...nel.dk>
To: linux-kernel@...r.kernel.org
Cc: Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 043/437] ecryptfs: miscdev: convert to read/write iterators

Signed-off-by: Jens Axboe <axboe@...nel.dk>
---
 fs/ecryptfs/miscdev.c | 24 +++++++++++-------------
 1 file changed, 11 insertions(+), 13 deletions(-)

diff --git a/fs/ecryptfs/miscdev.c b/fs/ecryptfs/miscdev.c
index 4e62c3cef70f..6ea67a64e2ff 100644
--- a/fs/ecryptfs/miscdev.c
+++ b/fs/ecryptfs/miscdev.c
@@ -309,6 +309,7 @@ ecryptfs_miscdev_read(struct file *file, char __user *buf, size_t count,
 	mutex_unlock(&daemon->mux);
 	return rc;
 }
+FOPS_READ_ITER_HELPER(ecryptfs_miscdev_read);
 
 /**
  * ecryptfs_miscdev_response - miscdevess response to message previously sent to daemon
@@ -342,22 +343,20 @@ static int ecryptfs_miscdev_response(struct ecryptfs_daemon *daemon, char *data,
 
 /**
  * ecryptfs_miscdev_write - handle write to daemon miscdev handle
- * @file: File for misc dev handle
- * @buf: Buffer containing user data
- * @count: Amount of data in @buf
- * @ppos: Pointer to offset in file (ignored)
+ * @iocb: Metadata for IO
+ * @from: Buffer containing user data
  *
  * Returns the number of bytes read from @buf
  */
 static ssize_t
-ecryptfs_miscdev_write(struct file *file, const char __user *buf,
-		       size_t count, loff_t *ppos)
+ecryptfs_miscdev_write(struct kiocb *iocb, struct iov_iter *from)
 {
 	__be32 counter_nbo;
 	u32 seq;
 	size_t packet_size, packet_size_length;
 	char *data;
 	unsigned char packet_size_peek[ECRYPTFS_MAX_PKT_LEN_SIZE];
+	size_t count = iov_iter_count(from);
 	ssize_t rc;
 
 	if (count == 0) {
@@ -372,8 +371,8 @@ ecryptfs_miscdev_write(struct file *file, const char __user *buf,
 		return -EINVAL;
 	}
 
-	if (copy_from_user(packet_size_peek, &buf[PKT_LEN_OFFSET],
-			   sizeof(packet_size_peek))) {
+	if (!copy_from_iter_full(packet_size_peek, sizeof(packet_size_peek),
+				 from)) {
 		printk(KERN_WARNING "%s: Error while inspecting packet size\n",
 		       __func__);
 		return -EFAULT;
@@ -395,7 +394,7 @@ ecryptfs_miscdev_write(struct file *file, const char __user *buf,
 	}
 
 memdup:
-	data = memdup_user(buf, count);
+	data = iterdup(from, count);
 	if (IS_ERR(data)) {
 		printk(KERN_ERR "%s: memdup_user returned error [%ld]\n",
 		       __func__, PTR_ERR(data));
@@ -416,7 +415,7 @@ ecryptfs_miscdev_write(struct file *file, const char __user *buf,
 		}
 		memcpy(&counter_nbo, &data[PKT_CTR_OFFSET], PKT_CTR_SIZE);
 		seq = be32_to_cpu(counter_nbo);
-		rc = ecryptfs_miscdev_response(file->private_data,
+		rc = ecryptfs_miscdev_response(iocb->ki_filp->private_data,
 				&data[PKT_LEN_OFFSET + packet_size_length],
 				packet_size, seq);
 		if (rc) {
@@ -442,13 +441,12 @@ ecryptfs_miscdev_write(struct file *file, const char __user *buf,
 	return rc;
 }
 
-
 static const struct file_operations ecryptfs_miscdev_fops = {
 	.owner   = THIS_MODULE,
 	.open    = ecryptfs_miscdev_open,
 	.poll    = ecryptfs_miscdev_poll,
-	.read    = ecryptfs_miscdev_read,
-	.write   = ecryptfs_miscdev_write,
+	.read_iter    = ecryptfs_miscdev_read_iter,
+	.write_iter   = ecryptfs_miscdev_write,
 	.release = ecryptfs_miscdev_release,
 	.llseek  = noop_llseek,
 };
-- 
2.43.0