Re: files disappearing from ls on NFS

Hartmut Brandt wrote:
> On Fri, 3 May 2013, Rick Macklem wrote:
> 
> RM>Ok, if you succeed in isolating the commit, that would be great.
> 
> Hmm. I'm somewhat stuck. clang from yesterday can't compile clang from
> a
> month ago...
> 
> harti
> 
Oh well. You could try this patch (which is the one to fix readdir for
union mounts), since I can see that VOP_VPTOCNP() will also be broken
without it. (I can't see how that would break "ls", but it breaks __getcwd()
and friends, so maybe it can affect "ls" somehow?)

It's a cut/paste under windows, so I'm afraid the whitespace will be
messed up, but it's pretty simple to apply by hand.

Index: nfs_clvnops.c
===================================================================
--- nfs_clvnops.c        (revision 249568)
+++ nfs_clvnops.c        (working copy)
_at__at_ -2221,6 +2221,7 _at__at_
                             !NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
                                 mtx_unlock(&np->n_mtx);
                                 NFSINCRGLOBAL(newnfsstats.direofcache_hits);
+                                    *ap->a_eofflag = 1;
                                 return (0);
                         } else
                                 mtx_unlock(&np->n_mtx);
_at__at_ -2233,8 +2234,10 _at__at_
         tresid = uio->uio_resid;
         error = ncl_bioread(vp, uio, 0, ap->a_cred);
 
-        if (!error && uio->uio_resid == tresid)
+        if (!error && uio->uio_resid == tresid) {
                 NFSINCRGLOBAL(newnfsstats.direofcache_misses);
+                    *ap->a_eofflag = 1;
+        }
         return (error);
 }

I haven't yet succeeded in reproducing the problem, but will be poking
at it some more, rick

> RM>
> RM>rick
> RM>
> RM>> harti
> RM>>
> RM>> On Fri, 3 May 2013, Rick Macklem wrote:
> RM>>
> RM>> RM>Hartmut Brandt wrote:
> RM>> RM>> Hi,
> RM>> RM>>
> RM>> RM>> I've updated one of my -current machines this week (previous
> RM>> update
> RM>> RM>> was in
> RM>> RM>> february). Now I see a strange effect (it seems only on NFS
> RM>> mounts):
> RM>> RM>> ls or
> RM>> RM>> even echo * will list only some files (strange enough the
> first
> RM>> files
> RM>> RM>> from
> RM>> RM>> the normal, alphabetically ordered list). If I change
> something
> RM>> in the
> RM>> RM>> directory (delete a file or create a new one) for some time
> the
> RM>> RM>> complete
> RM>> RM>> listing will appear but after sime time (seconds to a minute
> or
> RM>> so)
> RM>> RM>> again
> RM>> RM>> only part of the files is listed.
> RM>> RM>>
> RM>> RM>> A ktrace on ls /usr/src/lib/libc/gen shows that
> getdirentries is
> RM>> RM>> called
> RM>> RM>> only once (returning 4096). For a full listing getdirentries
> is
> RM>> called
> RM>> RM>> 5
> RM>> RM>> times with the last returning 0.
> RM>> RM>>
> RM>> RM>> I can still open files that are not listed if I know their
> name,
> RM>> RM>> though.
> RM>> RM>>
> RM>> RM>> The NFS server is a Windows 2008 server with an OpenText NFS
> RM>> Server
> RM>> RM>> which
> RM>> RM>> works without problems to all the other FreeBSD machines.
> RM>> RM>>
> RM>> RM>> So what could that be?
> RM>> RM>>
> RM>> RM>Someone else reported missing files returned via "ls"
> recently,
> RM>> when
> RM>> RM>they used a small readdirsize (below 8K). I haven't yet had a
> RM>> change to try
> RM>> RM>and reproduce it or do any snooping around.
> RM>> RM>
> RM>> RM>There haven't been any recent changes to readdir in the NFS
> client,
> RM>> RM>except a trivial one that adds a check for vnode type being
> VDIR,
> RM>> RM>so I don't see that it can be a recent NFS change.
> RM>> RM>
> RM>> RM>If you can increase the readdirsize, try that to see if it
> avoids
> RM>> RM>the problem. "nfsstat -m" shows you what the mount options end
> up
> RM>> RM>being after doing the mount. The server might be limiting the
> RM>> readdirsize
> RM>> RM>to 4K, so you should check, even if you specify a large value
> for
> RM>> RM>the mount.
> RM>> RM>
> RM>> RM>rick
> RM>> RM>
> RM>> RM>> Regards,
> RM>> RM>> harti
> RM>> RM>> _______________________________________________
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> RM>
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