linux-kernel - [PATCH] fs/ntfs3: drop preallocated clusters for sparse and compressed files

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Message-ID: <20251226174125.15780-1-almaz.alexandrovich@paragon-software.com>
Date: Fri, 26 Dec 2025 18:41:25 +0100
From: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
To: <ntfs3@...ts.linux.dev>
CC: <linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
	Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
Subject: [PATCH] fs/ntfs3: drop preallocated clusters for sparse and compressed files

Do not keep preallocated clusters for sparsed and compressed files.
Preserving preallocation in these cases causes fsx failures when running
with sparse files and preallocation enabled.

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
---
 fs/ntfs3/attrib.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/ntfs3/attrib.c b/fs/ntfs3/attrib.c
index c45880ab2391..0cd15a0983fe 100644
--- a/fs/ntfs3/attrib.c
+++ b/fs/ntfs3/attrib.c
@@ -448,8 +448,10 @@ int attr_set_size(struct ntfs_inode *ni, enum ATTR_TYPE type,
 
 	is_ext = is_attr_ext(attr_b);
 	align = sbi->cluster_size;
-	if (is_ext)
+	if (is_ext) {
 		align <<= attr_b->nres.c_unit;
+		keep_prealloc = false;
+	}
 
 	old_valid = le64_to_cpu(attr_b->nres.valid_size);
 	old_size = le64_to_cpu(attr_b->nres.data_size);
-- 
2.43.0