Date: Tue, 12 Aug 2008 20:50:11 +0200 From: Kris Kennaway <kris@FreeBSD.org> To: freebsd-fs@freebsd.org Subject: Re: new file system (my experiments) Message-ID: <48A1DB63.3050804@FreeBSD.org> In-Reply-To: <20080812182028.GA7047@dchagin.dialup.corbina.ru> References: <20080812182028.GA7047@dchagin.dialup.corbina.ru>
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Chagin Dmitry wrote:
> Hi
>
> I experiment resalization of new file system based on tmpfs - shmfs for
> Linux emulation layer. for the beginning has simply copied current source
> codes to compat/lintmps, has compiled a module and tried to mount:
>
> mount -t lintmpfs lintmpfs /compat/linux/dev/shm
> and has received a panic:
>
> #11 0xffffffff803b6ade in calltrap ()
> at /usr/local/root/pub/linux_shmfs/sys/amd64/amd64/exception.S:217
> ---Type <return> to continue, or q <return> to quit---
> #12 0xffffffff802a794b in vfs_filteropt (opts=0x0, legal=0xffffffff808497e0)
> at /usr/local/root/pub/linux_shmfs/sys/kern/vfs_mount.c:1812
> #13 0xffffffff80847015 in tmpfs_mount (mp=0xffffff0001a3a000,
> td=0xffffff004dcb56c0)
> at /usr/local/root/pub/linux_shmfs/sys/modules/lintmpfs/../../compat/lintmpf
> s/lintmpfs_vfsops.c:206
> #14 0xffffffff802a947f in vfs_donmount (td=0xffffff004dcb56c0, fsflags=0,
> fsoptions=0xffffff000190e800)
> at /usr/local/root/pub/linux_shmfs/sys/kern/vfs_mount.c:1010
> #15 0xffffffff802aaa46 in nmount (td=0xffffff004dcb56c0,
> uap=0xfffffffe7e7fcbf0)
> at /usr/local/root/pub/linux_shmfs/sys/kern/vfs_mount.c:417
> #16 0xffffffff803d4e47 in syscall (frame=0xfffffffe7e7fcc80)
> at /usr/local/root/pub/linux_shmfs/sys/amd64/amd64/trap.c:902
> #17 0xffffffff803b6ceb in Xfast_syscall ()
>
> (kgdb) f 12
> #12 0xffffffff802a794b in vfs_filteropt (opts=0x0, legal=0xffffffff808497e0)
> at /usr/local/root/pub/linux_shmfs/sys/kern/vfs_mount.c:1812
> 1812 {
> (kgdb) list *0xffffffff802a794b
> 0xffffffff802a794b is in vfs_filteropt (/usr/local/root/pub/linux_shmfs/sys/kern
> /vfs_mount.c:1818).
> 1813 struct vfsopt *opt;
> 1814 char errmsg[255];
> 1815 const char **t, *p, *q;
> 1816 int ret = 0;
> 1817
> 1818 TAILQ_FOREACH(opt, opts, link) {
> 1819 p = opt->name;
> 1820 q = NULL;
> 1821 if (p[0] == 'n' && p[1] == 'o')
> 1822 q = p + 2;
> (kgdb)
> (kgdb) up
> #13 0xffffffff80847015 in tmpfs_mount (mp=0xffffff0001a3a000,
> td=0xffffff004dcb56c0)
> at /usr/local/root/pub/linux_shmfs/sys/modules/lintmpfs/../../compat/lintmpf
> s/lintmpfs_vfsops.c:206
> 206 if (vfs_filteropt(mp->mnt_optnew, lintmpfs_opts))
> (kgdb)
>
> Problem in that mp->mnt_optnew is 0, but tmpfs works correctly.
> I shall not understand that I have missied...
>
If you have DEBUG_LOCKS and/or DEBUG_VFS_LOCKS then one of them changes
the kernel ABI (adds entries to structs somewhere). You need to either
add them to the module CFLAGS or use make buildkernel.
Kris
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