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List:       dragonfly-bugs
Subject:    [DragonFlyBSD - Bug #3237] msdosfs: can't properly read files longer than couple of kilobytes
From:       bugtracker-admin () leaf ! dragonflybsd ! org
Date:       2020-05-31 16:20:53
Message-ID: redmine.journal-13886.20200531162053.9ccf50fcd3a63c4e () leaf ! dragonflybsd ! org
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Issue #3237 has been updated by tkusumi.


Looks like inmemory buffer for data is somehow not landing ondisk, but can't \
reproduce it myself. Try fsck_msdosfs. I would presume fsck won't complain, meaning \
FAT clusters are in consistent state.

If this consistently (100% always) reproduces on FAT32 with a certain file size,

1) If you want to further investigate, you could try old kernels (probably before \
2019 September) and try to see or bisect if it reproduces. 2) I'd recommend to write \
the exact repro here, e.g. newfs_msdos output (which contains FAT params), the exact \
command to write to a file, the exact command to find out a file with \0 data beyond \
which offset, etc.

----------------------------------------
Bug #3237: msdosfs: can't properly read files longer than couple of kilobytes
http://bugs.dragonflybsd.org/issues/3237#change-13886

* Author: piecuch
* Status: New
* Priority: Normal
* Assignee: 
* Category: Other
* Target version: master
----------------------------------------
Reading a file from msdosfs reports valid data within the first couple of kilobytes, \
everything after that is only NULL bytes (or it might be some data from a different \
sector which is currently zeroed).

I have tested this on the following configurations:
write on Linux - corrupted data on dfly, correct data on Linux
write on dfly - corrupted data on dfly, correct data on Linux

I am running latest version from master.

I will see if this bug can be reproduced on freebsd and try to fix that/port stuff \
from freebsd. Hints welcome.



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