Lustre devel - Feb 2007 - [Bug 10786] NFS export and use of fsid

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today i finished investigate this problem...
problem is more complex then only lustre problem. 
>From other posts i see you use RHEL kernels - if i right root of problem in
nfs-tools and knfsd.
nfs-tools from RHEL4 can`t correctly read data from procfs in 2.6 kernels. If
MINOR or MAJOR number of device exceed 256 - 2.6 kernel use fsid type 3 to
communicate with rpc.mountd, but rpc.mountd from RHEL4 (nfs-utils 1.0.6-70.EL)
can`t read data in this format (can be read only type 0,1). 
After fix this in rpc.mountd, i found other bug in knfsd. knfsd can be read data
only with fsid type 1, other types is ignored. 
after fixing this isses i`m able to correctly export lustre file system without
set fsid in /etc/exports.

Other distros can be have similar problems.

problem don`t exist with rpc.mountd from nfs-utils v1.0.10 and in kernel after
2.6.16 (i inspect SLES10 kernel).

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Created an attachment (id=9473)
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patch for kernel fs/nfsd/export.c

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Created an attachment (id=9474)
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patch for nfs-tools

obtain from sles10.

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Created an attachment (id=9475)
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 --> (https://bugzilla.lustre.org/attachment.cgi?id=9475&action=view)
remove necessity set fsid for lustre exports

patch set flag FS_REQUIRES_DEV to lustre file system type. it`s safe for 2.6
kernel because none check it`s flag in kernel, except kNFSD (export.c).
nfs failover enabled by default for kernels up from 2.6.16 or any 2.4 kernel
(witch correctly exchange with mountd), or with set flag --enable-nfs-failover.

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just for reference.
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using the following link:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=226746

Please don''t reply to lustre-devel. Instead, comment in Bugzilla by
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(From update of attachment 9475)
>+# check kernel can support nfs failover
>+AC_DEFUN([LC_CORRECT_NFSD],
>+[AC_MSG_CHECKING([check nfsd can support failover])
>+LB_LINUX_TRY_COMPILE([
>+        #include <linux/version.h>
>+],[
>+        #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0)) &&
(LINUX_VERSION_CODE < KERNEL_VERSION(2,6,16))
>+        #error "this version nfsd can\`t support export non standart
devices"
>+        #endif
I tend to agree with Andreas that check like this is not enough due to patched
kernels. Of course it is hard to find out if there is no kernel source, too.
(and if we were to use code like this, no point in configure check, just put
that same #if into lustre sources)

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Created an attachment (id=9541)
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 --> (https://bugzilla.lustre.org/attachment.cgi?id=9541&action=view)
remove necessity set fsid for lustre exports

merge fixes from bug 9306.
add check CFS kernel patch into autoconf macro.