linux-kernel - [PATCH v2] fs/ntfs3: Forbid FALLOC_FL_PUNCH

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Date:   Wed, 29 Sep 2021 19:38:28 +0300
From:   Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
To:     <ntfs3@...ts.linux.dev>
CC:     <linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>
Subject: [PATCH v2] fs/ntfs3: Forbid FALLOC_FL_PUNCH_HOLE for normal files

FALLOC_FL_PUNCH_HOLE isn't allowed with normal files.
Filesystem must remember info about hole, but for normal file
we can only zero it and forget.

Fixes: 4342306f0f0d ("fs/ntfs3: Add file operations and implementation")
Now xfstests generic/016 generic/021 generic/022 pass.

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
---
 fs/ntfs3/file.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/fs/ntfs3/file.c b/fs/ntfs3/file.c
index 5fb3508e5422..43b1451bff53 100644
--- a/fs/ntfs3/file.c
+++ b/fs/ntfs3/file.c
@@ -587,8 +587,11 @@ static long ntfs_fallocate(struct file *file, int mode, loff_t vbo, loff_t len)
                truncate_pagecache(inode, vbo_down);
 
                if (!is_sparsed(ni) && !is_compressed(ni)) {
-                       /* Normal file. */
-                       err = ntfs_zero_range(inode, vbo, end);
+                       /*
+                        * Normal file, can't make hole.
+                        * TODO: Try to find way to save info about hole.
+                        */
+                       err = -EOPNOTSUPP;
                        goto out;
                }
 
-- 
2.33.0