[DragonFlyBSD - Bug #3459] (New) fuse(4)/mount_fusefs/ntfs-3g: hang in the I/O helper, zero file handle, short reads, explicit truncate, "nempty" option

[sigttou]

Issue #3459 has been reported by sigttou.

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Bug #3459: fuse(4)/mount_fusefs/ntfs-3g: hang in the I/O helper, zero file handle, short reads, explicit truncate, "nempty" option
http://bugs.dragonflybsd.org/issues/3459

* Author: sigttou
* Status: New
* Priority: Normal
* Category: Kernel
* Target version: 6.6
* Start date: 2026-11-02
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ntfs-3g 2022.10.3 on DragonFly:
* a mount with ntfs-3g's default options is refused outright
* a file whose daemon handle is 0 is never released, so after unlink it stays behind as @.fuse_hidden*@ (and rmdir fails)
* a short @FUSE_READ@ reply leaves stale bytes in the buffer
* an explicit @ftruncate()@ after an extending write is ignored
* and heavy I/O can hang forever.

The first four are bugs in the driver and in @mount_fusefs@, the hang is a lost wakeup in the FUSE BIO helper thread.

---Files--------------------------------
0002-fuse-zero-fill-the-tail-of-a-short-read.patch (1.2 KB)
0001-fuse-treat-a-zero-file-handle-as-a-valid-handle.patch (2.57 KB)
0003-fuse-honor-an-explicit-ftruncate-size.patch (872 Bytes)
0004-mount_fusefs-accept-the-nempty-option.patch (1.08 KB)
0005-fuse-fix-a-lost-wakeup-in-the-I-O-helper.patch (1.45 KB)


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