Date: Sun, 6 Jan 2008 15:41:21 +0100 From: Greg Byshenk <freebsd@byshenk.net> To: Jose Garcia Juanino <jjuanino@gmail.com> Cc: stable@freebsd.org Subject: Re: Cannot mount a nfs share after doing a snapshot Message-ID: <20080106144120.GD4601@core.byshenk.net> In-Reply-To: <20080105222831.GA862@gauss.sanabria.es> References: <20080105222831.GA862@gauss.sanabria.es>
next in thread | previous in thread | raw e-mail | index | archive | help
On Sat, Jan 05, 2008 at 11:28:31PM +0100, Jose Garcia Juanino wrote: > I have a 7.0-PRERELEASE i386 system with a nfs server, with an unique export > line in /etc/exports file: > > / -maproot=root -network 192.168.1.0 -mask 255.255.255.0 > > After a reboot, I have no problem mounting this nfs share from a nfs client. > But after issuing the following command on the server: > > # mount -u -o snapshot /.snap/now / Is the problem that you are trying to mount your snapshot on top of the / directory? I use snapshots, but have never tried to do this, and can imagine that there might be a problem, since the snapshot is itself a snapshot of a filesystem (different than the actual root filesystem). That would explain the error: > Jan 5 22:47:03 gauss mountd[542]: can't delete exports for /: Cross-device link What happens if you create a directory and mount your snapshot there: mkdir /snapshotmount mount -u -o snapshot /.snap/now /snapshotmount If this works, then you may need a separate exports line for /snapshotmount. If this fails, does it work if you use the more roundabout mount? That is mdconfig -a -t vnode -f /.snapn/now -u 4 mount -r /dev/md4 /snapshotmount -greg > the syslog shows: > > Jan 5 22:47:03 gauss mountd[542]: can't delete exports for /: Cross-device link > Jan 5 22:47:03 gauss mountd[542]: can't export / > Jan 5 22:47:03 gauss mountd[542]: bad exports list line / -maproot > > and I cannot mount this nfs share from a client anymore. The client > complains with a "[udp] gauss:/: Permission denied" error message. > > Some tips about this weird problem: > > 1) On a 6.2-RELEASE nfs server does not happen (or I am not been able to > reproduce it) > > 2) It looks like it is not platform dependent, as on a 7.0-PRERELEASE > sparc64 nfs server I get exactly the same result. > > 3) If I issue the mksnap_ffs command to make the snapshot, I get no error > messages from syslog and I can mount the nfs share from any nfs client. > > 4) If the nfs server is a sparc64 the response of the nfs client is > "[udp] riemann:/: RPCPROG_MNT: RPC: Can't decode result" (after issuing > the mount -u -o snapshot /.snap/now / command on the server, of > course). > > I have a custom kernel on the i386 nfs server. The output of > > # config -x /boot/kernel/kernel > > is: > > ############################# > options CONFIG_AUTOGENERATED > ident MK2007Nov01 > machine i386 > cpu I686_CPU > options CONSPEED=115200 > options ATA_STATIC_ID > options AUDIT > options STOP_NMI > options ADAPTIVE_GIANT > options KBD_INSTALL_CDEV > options _KPOSIX_PRIORITY_SCHEDULING > options SYSVSEM > options SYSVMSG > options SYSVSHM > options KTRACE > options SCSI_DELAY=2000 > options COMPAT_FREEBSD6 > options COMPAT_FREEBSD5 > options COMPAT_FREEBSD4 > options COMPAT_43TTY > options GEOM_LABEL > options GEOM_PART_GPT > options PSEUDOFS > options PROCFS > options CD9660 > options MSDOSFS > options NFS_ROOT > options NFSSERVER > options NFSCLIENT > options MD_ROOT > options UFS_DIRHASH > options UFS_GJOURNAL > options UFS_ACL > options SOFTUPDATES > options FFS > options INET6 > options SCTP > options INET > options PREEMPTION > options SCHED_4BSD > options INCLUDE_CONFIG_FILE > options KSE > options GEOM_MBR > options GEOM_BSD > options ISAPNP > device isa > device npx > device mem > device io > device uart_ns8250 > device apic > device cpufreq > device pci > device fdc > device ata > device atadisk > device atapicd > device atapifd > device scbus > device ch > device da > device sa > device cd > device pass > device ses > device atapicam > device atkbdc > device atkbd > device kbdmux > device psm > device vga > device splash > device sc > device apm > device pmtimer > device uart > device sio > device miibus > device rl > device loop > device random > device ether > device ppp > device tun > device pty > device firmware > device md > device gif > device faith > device bpf > device uhci > device usb > device ugen > device uhid > device umass > device smbus > device viapm > device smb > device iicbus > device iicbb > device ic > device iic > device iicsmb > ############################# > > The dmesg -a output is: > > ############################# > > Copyright (c) 1992-2008 The FreeBSD Project. > Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994 > The Regents of the University of California. All rights reserved. > FreeBSD is a registered trademark of The FreeBSD Foundation. > FreeBSD 7.0-PRERELEASE #0: Sun Dec 30 20:10:53 CET 2007 > root@gauss.sanabria.es:/usr/obj/usr/src/sys/MK2007Nov01 > Timecounter "i8254" frequency 1193182 Hz quality 0 > CPU: Intel Pentium III (1002.28-MHz 686-class CPU) > Origin = "GenuineIntel" Id = 0x68a Stepping = 10 > Features=0x383f9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE> > real memory = 1342111744 (1279 MB) > avail memory = 1304973312 (1244 MB) > kbd1 at kbdmux0 > cpu0 on motherboard > apm0: <APM BIOS> on motherboard > apm0: found APM BIOS v1.2, connected at v1.2 > pcib0: <Host to PCI bridge> pcibus 0 on motherboard > pir0: <PCI Interrupt Routing Table: 8 Entries> on motherboard > pci0: <PCI bus> on pcib0 > pcib1: <PCI-PCI bridge> at device 1.0 on pci0 > pci1: <PCI bus> on pcib1 > isab0: <PCI-ISA bridge> at device 7.0 on pci0 > isa0: <ISA bus> on isab0 > atapci0: <VIA 82C596B UDMA66 controller> port 0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0xd000-0xd00f at device 7.1 on pci0 > ata0: <ATA channel 0> on atapci0 > ata0: [ITHREAD] > ata1: <ATA channel 1> on atapci0 > ata1: [ITHREAD] > viapropm0: <VIA VT82C596A Power Management Unit> port 0x5000-0x500f at device 7.3 on pci0 > smbus0: <System Management Bus> on viapropm0 > smb0: <SMBus generic I/O> on smbus0 > vgapci0: <VGA-compatible display> mem 0xdc000000-0xdfffffff irq 12 at device 15.0 on pci0 > rl0: <RealTek 8139 10/100BaseTX> port 0xd800-0xd8ff mem 0xe1000000-0xe10000ff irq 11 at device 18.0 on pci0 > miibus0: <MII bus> on rl0 > rlphy0: <RealTek internal media interface> PHY 0 on miibus0 > rlphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto > rl0: Ethernet address: 00:50:fc:f7:70:0a > rl0: [ITHREAD] > pci0: <multimedia, audio> at device 19.0 (no driver attached) > pci0: <input device> at device 19.1 (no driver attached) > pmtimer0 on isa0 > orm0: <ISA Option ROM> at iomem 0xc0000-0xc7fff pnpid ORM0000 on isa0 > atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0 > atkbd0: <AT Keyboard> irq 1 on atkbdc0 > kbd0 at atkbd0 > atkbd0: [GIANT-LOCKED] > atkbd0: [ITHREAD] > fdc0: <Enhanced floppy controller> at port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on isa0 > fdc0: [FILTER] > fd0: <1440-KB 3.5" drive> on fdc0 drive 0 > sc0: <System console> at flags 0x100 on isa0 > sc0: VGA <16 virtual consoles, flags=0x300> > sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0 > sio0: type 16550A, console > sio0: [FILTER] > sio1 at port 0x2f8-0x2ff irq 3 on isa0 > sio1: type 16550A > sio1: [FILTER] > vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0 > unknown: <PNP0303> can't assign resources (port) > unknown: <PNP0c01> can't assign resources (memory) > unknown: <PNP0a03> can't assign resources (port) > unknown: <PNP0501> can't assign resources (port) > unknown: <PNP0700> can't assign resources (port) > unknown: <PNP0501> can't assign resources (port) > WARNING: ZFS is considered to be an experimental feature in FreeBSD. > Timecounters tick every 1.000 msec > ZFS filesystem version 6 > ZFS storage ad0: 38166MB <Seagate ST340014A 3.06> at ata0-master UDMA66 > pool version 6 > ad2: 57241MB <Seagate ST360020A 3.39> at ata1-master UDMA66 > acd0: DVDR <HL-DT-ST DVDRAM GSA-4163B/A104> at ata1-slave UDMA33 > acd0: FAILURE - INQUIRY ILLEGAL REQUEST asc=0x24 ascq=0x00 sks=0x40 0x00 0x01 > cd0 at ata1 bus 0 target 1 lun 0 > cd0: <HL-DT-ST DVDRAM GSA-4163B A104> Removable CD-ROM SCSI-0 device > cd0: 33.000MB/s transfers > cd0: Attempt to query device size failed: NOT READY, Medium not present > Trying to mount root from ufs:/dev/ad0s1d > Loading configuration files. > Entropy harvesting: > interrupts > ethernet > point_to_point > kickstart > . > swapon: adding /dev/ad0s1b as swap device > Fast boot: skipping disk checks. > Setting hostuuid: 1e6dbcf7-8aad-11dc-a5e0-0050fcf7700a. > Setting hostid: 0x86fbd995. > Mounting local file systems: > . > Setting hostname: gauss.sanabria.es. > net.inet6.ip6.auto_linklocal: > 1 > -> > 0 > > kern.geom.debugflags: > 0 > -> > 16 > > kern.ipc.shmmax: > 33554432 > -> > 67108864 > > kern.ipc.shmall: > 8192 > -> > 32768 > > kern.coredump: > 1 > -> > 0 > > vfs.usermount: > 0 > -> > 1 > > kern.ipc.shm_allow_removed: > 0 > -> > 1 > > vfs.nfs.iodmin: > 0 > -> > 4 > > lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384 > inet6 fe80::1%lo0 prefixlen 64 scopeid 0x2 > inet6 ::1 prefixlen 128 > inet 127.0.0.1 netmask 0xff000000 > rl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 > options=8<VLAN_MTU> > ether 00:50:fc:f7:70:0a > inet 192.168.1.4 netmask 0xffffff00 broadcast 192.168.1.255 > media: Ethernet autoselect (none) > status: no carrier > add net default: gateway 192.168.1.1 > add net 192.168.57.0: gateway 192.168.1.5 > add net 10.0.0.0: gateway 192.168.1.5 > Additional routing options: > . > Starting devd. > Additional IP options: > . > Mounting NFS file systems: > . > ELF ldconfig path: /lib /usr/lib /usr/lib/compat /usr/local/lib /usr/local/lib/compat/pkg /usr/local/lib/compat /usr/local/lib/compat/pkg /usr/local/lib/gcc/i386-portbld-freebsd7.0/3.4.6 /usr/local/lib/pth /usr/local/lib/zsh > a.out ldconfig path: /usr/lib/aout /usr/lib/compat/aout > Creating and/or trimming log files: > . > Starting syslogd. > Initial i386 initialization: > . > Additional ABI support: > . > Setting date via ntp. > 5 Jan 22:41:49 ntpdate[496]: step time server 212.9.75.245 offset 0.950467 sec > Starting rpcbind. > NFS access cache time=60 > Clearing /tmp (X related). > Starting mountd. > Starting nfsd. > Starting statd. > Starting lockd. > Starting xinetd. > Removing stale Samba tdb files: > . > . > . > . > . > . > . > . > done > Starting nmbd. > Starting smbd. > Starting local daemons: > . > Updating motd > . > Mounting late file systems: > . > Starting ntpd. > postfix/postfix-script: starting the Postfix mail system > Starting distccd. > Performing sanity check on apache22 configuration: > Syntax OK > Starting apache22. > Starting anacron. > Configuring syscons: > keymap > keyrate > font8x16 > font8x14 > font8x8 > blanktime > . > Starting sshd. > Starting cron. > Local package initialization: > ############################# > > > > Also, my /etc/src.conf used to build the world: > > > ############################# > WITHOUT_ACPI=1 > WITHOUT_ASSERT_DEBUG=1 > WITHOUT_ATM=1 > WITHOUT_AUDIT=1 > WITHOUT_AUTHPF=1 > WITHOUT_BIND_DNSSEC=1 > WITHOUT_BIND_ETC=1 > WITHOUT_BIND_LIBS_LWRES=1 > WITHOUT_BIND_MTREE=1 > WITHOUT_BIND_NAMED=1 > WITHOUT_BLUETOOTH=1 > WITHOUT_I4B=1 > WITHOUT_IPFILTER=1 > WITHOUT_IPX=1 > WITHOUT_KERBEROS=1 > WITHOUT_LPR=1 > WITHOUT_NIS=1 > WITHOUT_PF=1 > WITHOUT_PROFILE=1 > WITHOUT_SENDMAIL=1 > WITHOUT_SHAREDOCS=1 > ############################# > > > The /etc/make.conf file: > > ############################# > CPUTYPE?=pentium3 > MODULES_OVERRIDE= linux if_tap sound/driver/emu10k1 syscons/green \ > linprocfs linsysfs smbfs ntfs ext2fs libiconv \ > libmchain aio if_bridge vesa \ > cd9660_iconv udf_iconv msdosfs_iconv ntfs_iconv \ > zfs bridgestp > BOOT_COMCONSOLE_PORT= 0x3F8 > BOOT_COMCONSOLE_SPEED= 115200 > PERL_VER=5.8.8 > PERL_VERSION=5.8.8 > ############################# > > > > Regards -- greg byshenk - gbyshenk@byshenk.net - Leiden, NL
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20080106144120.GD4601>