Message-ID:
 <DS0PR12MB7607A64713EFA94389870625BA302@DS0PR12MB7607.namprd12.prod.outlook.com>
Date: Thu, 5 Dec 2024 18:37:23 +0000
From: Richa Sahasrabudhe <rsahasrabudh@...dia.com>
To: "stable@...r.kernel.org" <stable@...r.kernel.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: QNX6 Linux kernel module RO limitation

Hi

I am trying to use the linux qnx6 module to mount a QNX6 filesystem partition from an SSD onto a linux host. I am able to mount the partition, however any file > 2GB get truncated (or corrupted?) to 2GB when read from the mountpoint.

Questions -
Is there a limitation on maximum file size that the module supports?
I have tried formatting the QNX6 partition to use 1K, 4K, and 16K block size.
The linux module could only mount ones with 1K & 4K bs. However, both cannot read files >2GB without corruption.
16K did not mount — “mount: /mnt/qnx6_16kbs: wrong fs type, bad option, bad superblock on /dev/nvme1n3p2, missing codepage or helper program, or other error.”
Is there a limitation on block size supported by this module?

I browsed the kernel source code to look for any such limitations, but I could not find any. I want to patch the module to add support for files >2GB. Can you please provide some inputs that will help me find the appropriate part of the code?

$ modinfo qnx6
filename:       /lib/modules/6.8.0-45-generic/kernel/fs/qnx6/qnx6.ko
license:        GPL
alias:          fs-qnx6
srcversion:     B81F3D9620B1753DF4431D7
depends:        
retpoline:      Y
intree:         Y
name:           qnx6
vermagic:       6.8.0-45-generic SMP preempt mod_unload modversions
sig_id:         PKCS#7
signer:         Build time autogenerated kernel key
sig_key:        03:0B:6C:98:F4:46:33:57:AA:65:3F:5B:DF:E4:5A:02:84:DF:3A:24
sig_hashalgo:   sha512
signature:      0D:5A:21:4B:A4:74:DF:06:9C:63:9F:51:02:7A:DD:54:EE:94:A8:F5:
22:3F:B2:1A:F7:1B:BC:55:3B:D5:25:A2:01:C7:40:9B:E8:A1:50:F5:
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AE:DE:22:BB:DF:E1:CC:11:E9:33:A6:49

Thanks!

-
Richa

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