https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=199152
Bug ID: 199152
Summary: msdosfs writes on umount to readonly mounted fs
Product: Base System
Version: 10.1-STABLE
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: longw...@incore.de
Created attachment 155169
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=155169&action=edit
Patch for msdosfs
In FreeBSD 10.1-STABLE #10 r279940 I see
mount -r /mydosfs
umount /mydosfs
umount: unmount of /mydosfs failed: Operation not permitted
On console: g_vfs_done():ada0p1[WRITE(offset=512, length=512)]error = 1
The next umount works.
This problem was introduced by rev 275638 to head, because in the case of a
readonly mounted msdosfs a call of msdosfs_sync() was introduced which failes
to write in msdos_fsiflush(). This happens because the flag MSDOSFS_FSIMOD is
set on the first call of msdosfs_sync().
The attached patch solves the problem for me and includes also some minor
changes necessary to build the kernel with MSDOS_DEBUG.
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