Date: Tue, 27 Sep 2005 10:53:22 +0100 From: Peter Edwards <peadar.edwards@gmail.com> To: Mikhail Teterin <mi+mx@aldan.algebra.com> Cc: gayn.winters@bristolsystems.com, fs@freebsd.org Subject: Re: can not mount a large FAT32 filesystem Message-ID: <34cb7c840509270253194f7487@mail.gmail.com> In-Reply-To: <20050927183235.T24493@delplex.bde.org> References: <20050927014825.6378E1BB0B@citi.umich.edu> <20050927183235.T24493@delplex.bde.org>
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[-- Attachment #1 --] On 9/27/05, Bruce Evans <bde@zeta.org.au> wrote: > On Mon, 26 Sep 2005, Jim Rees wrote: > > > Maybe a quick fsck_msdos would do the trick.. > > > > I doubt it. The message implies a problem with the partition table, not the > > file system. I suspect it's a geometry problem, especially since the CHS > > values don't match the LBA. > > Except the eror is reading the partition table itself. This cannot be a > "geometry" problem, except possibly one involving the sector size, since > the partition table is in sector 0 and contains the geometry. This is > a very strange error, since the kernel does the same read as fdisk to > read the partition table, and fdisk seems to work. > I think I've seen this before: the validation of the boot sector is a bit OTT. The description of the bootblock on the microsoft website at http://support.microsoft.com/kb/q140418/ Gives no description at all of the BOOTSIG3 and BOOTSIG3 fields that are validated: I don't think there's any reason to check them. Can you try this patch? [-- Attachment #2 --] Index: msdosfs_vfsops.c =================================================================== RCS file: /nfs/dyson/export/home/petere/freebsd-cvs/cvs/FreeBSD/src/sys/fs/msdosfs/msdosfs_vfsops.c,v retrieving revision 1.144 diff -u -r1.144 msdosfs_vfsops.c --- msdosfs_vfsops.c 24 Mar 2005 07:36:13 -0000 1.144 +++ msdosfs_vfsops.c 27 Sep 2005 09:40:19 -0000 @@ -512,9 +512,7 @@ #endif /* !MSDOSFS_LARGE */ if (pmp->pm_RootDirEnts == 0) { - if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 - || bsp->bs710.bsBootSectSig3 != BOOTSIG3 - || pmp->pm_Sectors + if (pmp->pm_Sectors || pmp->pm_FATsecs || getushort(b710->bpbFSVers)) { error = EINVAL;
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