[DragonFlyBSD - Bug #3237] (Resolved) msdosfs: can't properly read files longer than couple of kilobytes

[bugtracker-admin at leaf.dragonflybsd.org]

Issue #3237 has been updated by dillon.

Status changed from New to Resolved
Assignee set to dillon

Going to push this.  There is clearly something more involved here, probably related to the bmap code or to assumptions made by this older filesystem code with regards to how buffers crossing the file EOF are laid out.  But for now lets just go with this work-around.

-Matt

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Bug #3237: msdosfs: can't properly read files longer than couple of kilobytes
http://bugs.dragonflybsd.org/issues/3237#change-13955

* Author: piecuch
* Status: Resolved
* Priority: Normal
* Assignee: dillon
* Category: Other
* Target version: master
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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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first-ununiq.svg (1.01 MB)
second-ununiq.svg (1.03 MB)
third-ununiq.svg (1010 KB)
0001-msdosfs-fix-3237-where-reading-the-last-sector-of-a-.patch (1.49 KB)


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