Export a directory that does not exist:
exportfs -orw,fsid=0,insecure,no_subtree_check client:/home/NFS4
Try to mount from client with nfs4. Mount hangs (I'm not sure why -
that's another issue).
While client is hung, back on server
mkdir /home/NFS4
The server panics in dput. I traced the problem back to svc_export_parse()
calling path_release() even though path_lookup() failed (it happens
to fill in the nameidata structure with a negative dentry - so the test
after out: succeeds).
After patching, an recreating the problem, the client mount still takes
some time before finally exiting with a message "couldn't read
superblock".
Here is a simple patch to resolve this issue:
Signed-Off-By: Frank Filz <[email protected]>
Signed-off-by: J. Bruce Fields <[email protected]>
Signed-off-by: Neil Brown <[email protected]>
### Diffstat output
./fs/nfsd/export.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff ./fs/nfsd/export.c~current~ ./fs/nfsd/export.c
--- ./fs/nfsd/export.c~current~ 2006-04-03 15:12:08.000000000 +1000
+++ ./fs/nfsd/export.c 2006-04-03 15:12:08.000000000 +1000
@@ -422,7 +422,7 @@ static int svc_export_parse(struct cache
if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
goto out;
err = path_lookup(buf, 0, &nd);
- if (err) goto out;
+ if (err) goto out_no_path;
exp.h.flags = 0;
exp.ex_client = dom;
@@ -475,6 +475,7 @@ static int svc_export_parse(struct cache
out:
if (nd.dentry)
path_release(&nd);
+ out_no_path:
if (dom)
auth_domain_put(dom);
kfree(buf);
-
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