[Bug 199152] msdosfs writes on umount to readonly mounted fs

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=199152

longwitz at incore.de changed:

           What    |Removed                     |Added
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                 CC|                            |longwitz at incore.de

--- Comment #4 from longwitz at incore.de ---
Your assertions from r281120 did not trigger. I found the flag FSIMOD is set in
usemap_free() called from fillinusemap(), which is called from mountmsdosfs()
but before the MSDOSFSMNT_RONLY flag is set. Thats the reason why your
assertion is missed. At the begin of the "for (cn = CLUST_FIRST .." loop in
fillinusemap() I see pm_flags=0x20000000 and pm_maxcluster=98305. After the
loop I have pm_flags=0x21000000 and usemap_free() was called 79356 times,
enough to set the FSIMOD bit.
The first install of my test maschine was Windows 7 mit UEFI, I boot FreeBSD 10
Stable with PXE, because my motherboard (Gigabyte hGA-A75M-UD2H) has the
problem described in PR/193646 and FreeBSD hangs on EFI boot. My test msdosfs
partition is the EFI partition installed by Windows 7 and is 100 MB in size.
For clarification the output of "gpart show":

=>       34  234441581  ada0  GPT  (112G)
         34       2014        - free -  (1.0M)
       2048     204800     1  efi  (100M)
     206848     262144     2  ms-reserved  (128M)
     468992  182771712     3  ms-basic-data  (87G)
  183240704       1024     4  freebsd-boot  (512K)
  183241728    2097152     5  freebsd-ufs  (1.0G)
  185338880    8388608     6  freebsd-swap  (4.0G)
  193727488    8388608     7  freebsd-ufs  (4.0G)
  202116096   16777216     8  freebsd-ufs  (8.0G)
  218893312   15548302     9  freebsd-ufs  (7.4G)
  234441614          1        - free -  (512B)

If you need more information let me know.

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