linux-kernel - [PATCH 03/11] fuse: fuse_dev_splice

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Message-ID: <b5c5b0a18a59ec31f098959e26530ff607a67379.1697486714.git.nabijaczleweli@nabijaczleweli.xyz>
Date:   Mon, 16 Oct 2023 22:35:42 +0200
From:   Ahelenia Ziemiańska 
        <nabijaczleweli@...ijaczleweli.xyz>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Miklos Szeredi <miklos@...redi.hu>, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 03/11] fuse: fuse_dev_splice_read: use nonblocking I/O

Otherwise we risk sleeping with the pipe locked for indeterminate
lengths of time.

Link: https://lore.kernel.org/linux-fsdevel/qk6hjuam54khlaikf2ssom6custxf5is2ekkaequf4hvode3ls@zgf7j5j4ubvw/t/#u
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@...ijaczleweli.xyz>
---
 fs/fuse/dev.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 1a8f82f478cb..4e8caf66c01e 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -1202,7 +1202,8 @@ __releases(fiq->lock)
  * the 'sent' flag.
  */
 static ssize_t fuse_dev_do_read(struct fuse_dev *fud, struct file *file,
-				struct fuse_copy_state *cs, size_t nbytes)
+				struct fuse_copy_state *cs, size_t nbytes,
+				bool nonblock)
 {
 	ssize_t err;
 	struct fuse_conn *fc = fud->fc;
@@ -1238,7 +1239,7 @@ static ssize_t fuse_dev_do_read(struct fuse_dev *fud, struct file *file,
 			break;
 		spin_unlock(&fiq->lock);
 
-		if (file->f_flags & O_NONBLOCK)
+		if (nonblock)
 			return -EAGAIN;
 		err = wait_event_interruptible_exclusive(fiq->waitq,
 				!fiq->connected || request_pending(fiq));
@@ -1364,7 +1365,8 @@ static ssize_t fuse_dev_read(struct kiocb *iocb, struct iov_iter *to)
 
 	fuse_copy_init(&cs, 1, to);
 
-	return fuse_dev_do_read(fud, file, &cs, iov_iter_count(to));
+	return fuse_dev_do_read(fud, file, &cs, iov_iter_count(to),
+				file->f_flags & O_NONBLOCK);
 }
 
 static ssize_t fuse_dev_splice_read(struct file *in, loff_t *ppos,
@@ -1388,7 +1390,7 @@ static ssize_t fuse_dev_splice_read(struct file *in, loff_t *ppos,
 	fuse_copy_init(&cs, 1, NULL);
 	cs.pipebufs = bufs;
 	cs.pipe = pipe;
-	ret = fuse_dev_do_read(fud, in, &cs, len);
+	ret = fuse_dev_do_read(fud, in, &cs, len, true);
 	if (ret < 0)
 		goto out;
 
-- 
2.39.2

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