Paul B Mahol <one...@gmail.com> wrote: > FreeBSD 9.0 CURRENT panics when mounting file system created via > newfs_msdos on DVD-RAM disc. > Something to do about divide by zero.
I recently had a similar problem with a 16GB iPod. I still haven't
managed to actually mount it, but the patch below at least works
around the panic.
Does it work for you, too?
From 682d827f591d703e049274f495bf90f41b27c15f Mon Sep 17 00:00:00 2001
From: Fabian Keil <f...@fabiankeil.de>
Date: Fri, 19 Mar 2010 18:59:49 +0100
Subject: [PATCH] Work around weird msdosfs crash on mount. How can SecPerClust
be zero here?
---
sys/fs/msdosfs/msdosfs_vfsops.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/sys/fs/msdosfs/msdosfs_vfsops.c b/sys/fs/msdosfs/msdosfs_vfsops.c
index f229e91..22913c2 100644
--- a/sys/fs/msdosfs/msdosfs_vfsops.c
+++ b/sys/fs/msdosfs/msdosfs_vfsops.c
@@ -606,6 +606,12 @@ mountmsdosfs(struct vnode *devvp, struct mount *mp)
pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize;
}
+ if (SecPerClust == 0) {
+ printf("SecPerClust is 0? When did this happen?\n");
+ error = EINVAL;
+ goto error_exit;
+ }
+
pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) /
SecPerClust + 1;
pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */
--
1.6.6.2
Fabian
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