linux-ext4 - [PATCH 12/12] fuse2fs: check free space when creating a symlink

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Message-ID: <175797569835.245695.17963678318721637704.stgit@frogsfrogsfrogs>
Date: Mon, 15 Sep 2025 15:40:50 -0700
From: "Darrick J. Wong" <djwong@...nel.org>
To: tytso@....edu
Cc: linux-ext4@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: [PATCH 12/12] fuse2fs: check free space when creating a symlink

From: Darrick J. Wong <djwong@...nel.org>

Make sure we have enough space to create the symlink and its remote
block.

Cc: <linux-ext4@...r.kernel.org> # v1.43
Fixes: 81cbf1ef4f5dab ("misc: add fuse2fs, a FUSE server for e2fsprogs")
Signed-off-by: "Darrick J. Wong" <djwong@...nel.org>
---
 misc/fuse2fs.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/misc/fuse2fs.c b/misc/fuse2fs.c
index c09b2aa04c02fb..569ac402427767 100644
--- a/misc/fuse2fs.c
+++ b/misc/fuse2fs.c
@@ -1825,6 +1825,10 @@ static int op_symlink(const char *src, const char *dest)
 	*node_name = 0;

 	pthread_mutex_lock(&ff->bfl);
+	if (!fs_can_allocate(ff, 1)) {
+		ret = -ENOSPC;
+		goto out2;
+	}
 	err = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, temp_path,
 			   &parent);
 	*node_name = a;