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[bug #25961] fatfs truncating files

From: Thomas Schwinge
Subject: [bug #25961] fatfs truncating files
Date: Sun, 22 Mar 2009 12:10:06 +0000
User-agent: Mozilla/5.0 (X11; U; Linux i686; de; rv: Gecko/2009030422 Ubuntu/8.10 (intrepid) Firefox/3.0.7


                 Summary: fatfs truncating files
                 Project: The GNU Hurd
            Submitted by: tschwinge
            Submitted on: So 22 Mär 2009 13:10:03 CET
                Category: Hurd Servers
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
         Reproducibility: Every Time
              Size (loc): None
         Planned Release: None
                  Effort: 0.00
Wiki-like text discussion box: 



In a QEMU system, accessing the same file through ext2fs (backed by a disk
partiton image file) and fatfs (on-the-fly generated by QEMU from a directory
hierarchy), these files generally are reported by cmp to differ at ``char
8193''.  Copying such a file off of the fatfs will result in a bus error and
the file being truncated to 32768 bytes.

The problem is likely to be in fatfs, as GRUB can successfully access and
load files off of the QEMU-generated fatfs.


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