--- In "charliem_1216" <> wrote:
>
> --- In "j.chitte" <j.chitte@> wrote:
> >
> > --- In "j.chitte" <j.chitte@> wrote:
> > >
> > > --- In "charliem_1216" <charliem_1216@> wrote:
> > > >
> > > > --- In "j.chitte" <j.chitte@> wrote:
> > > > >
> > > > > Hi,
> > > > >
> > > > > I'm booting to an nfs image that contains a script. The first line is:
> > > > >
> > > > > #! /usr/bin/mawk -f
> > > > >
> > > > > I want to edit this use awk but every time I change and save it, it
> > > > > springs back to reading mawk.
> > > > >
> > > > > I have editted it with nano on the host and with vi via minicom on
> > > > > the running SBC but I can't get the change to stick.
> > > > >
> > > > > In fact it's when I reopen with vi that it gets set back.
> > > > >
> > > > > If I change it with vi and :wq , I can see it saves correctly by
> > > > > looking at the file on the host. But if I reopen with vi it is set
> > > > > back to mawk.
> > > > >
> > > > > Can anyone suggest what is happening?
> > > >
> > > > Be sure to set the sync option in your exportfs lines.
> > > >
> > > > There is a long history here; see nfs.sourceforge.net and the howto
> > > > (http://nfs.sourceforge.net/nfs-howto/ar01s05.html#sync_versus_async)
> > > > specifically.
> > > >
> > > > Basically, if async is used by the server, the server has permission to
> > > > ignore client O_SYNC requests.
> > > >
> > > > regards, ........ Charlie
> > > > >
> > > > > TIA
> > > > >
> > > >
> > > Thanks, I did not think I knew that but apparently I did.
> > >
> > > bash-4.0#/usr/sbin/exportfs -v
> > > /mnt/nfs arm.localdomain(rw,wdelay,no_root_squash,no_subtree_check)
> > > /mnt/nfs linbox.localdomain(rw,wdelay,no_root_squash)
> > >
> > > The absence of async indicating it is mounted sync.
>
> Maybe try adding the sync option to the exportfs line, no matter what you
> think the default should be?
>
> Try calling 'sync' manually after your edits?
>
> regards, ........ Charlie
>
> > >
> > > /mnt/nfs is a bind mount to where I actually work on the image and it it
> > > is what I refer to in my redboot exec command.
> > >
> > > What is even odder is that I managed to add a comment in line 2 of the
> > > file that stuck but mawk keeps coming back in line 1.
> > >
> > > :?
> > >
> >
> > Having rebooted both systems overnight I now see awk as I require.
> >
> > I have not pinned down exactly what sequence produces the error but
> > something is clearly wrong with nfs sync.
> >
> > It seems that nfs is not reliable (I've seen several such comments in the
> > past) and should be used with circumspection.
> >
> > Editing files on the nfs mounted system seems to be a bad idea. An nfs
> > restart and sbc reboot is the only time I can believe what I see.
> >
> > :(
> >
>
yes , that is what I have.
/mnt/nfs arm(no_root_squash,sync,rw,no_subtree_check)
/mnt/nfs linbox(no_root_squash,sync,rw,subtree_check)
My comment about default was that exportfs -v will only display async option.
Absence thereof indicates sync.
I'll try to stick to editing directly on the host machine. If the nfs host is
allowed to lie about the state of a file I'm not sure running sync on the board
will affect much. I'll try next time it happends.
thx.
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