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nfsd4: fix error return when pseudoroot missing 

We really shouldn't hit this case at all, and forthcoming kernel and
nfs-utils changes should eliminate this case; if it does happen,
consider it a bug rather than reporting an error that doesn't really
make sense for the operation (since there's no reason for a server to be
accepting v4 traffic yet have no root filehandle).

Also move some exp_pseudoroot code into a helper function while we're
here.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
J. Bruce Fields 2009-09-27 14:41:43 -04:00
parent 289ede453e
commit f39bde24b2
2 changed files with 19 additions and 4 deletions
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22
fs/nfsd/export.c
View File

@ -1320,6 +1320,23 @@ rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
return exp;
}
static struct svc_export *find_fsidzero_export(struct svc_rqst *rqstp)
{
struct svc_export *exp;
u32 fsidv[2];
mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
exp = rqst_exp_find(rqstp, FSID_NUM, fsidv);
/*
* We shouldn't have accepting an nfsv4 request at all if we
* don't have a pseudoexport!:
*/
if (IS_ERR(exp) && PTR_ERR(exp) == -ENOENT)
exp = ERR_PTR(-ESERVERFAULT);
return exp;
}
/*
* Called when we need the filehandle for the root of the pseudofs,
* for a given NFSv4 client. The root is defined to be the
@ -1330,11 +1347,8 @@ exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
{
struct svc_export *exp;
__be32 rv;
u32 fsidv[2];
mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
exp = rqst_exp_find(rqstp, FSID_NUM, fsidv);
exp = find_fsidzero_export(rqstp);
if (IS_ERR(exp))
return nfserrno(PTR_ERR(exp));
rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);

1
fs/nfsd/nfsproc.c
View File

@ -758,6 +758,7 @@ nfserrno (int errno)
{ nfserr_io, -ETXTBSY },
{ nfserr_notsupp, -EOPNOTSUPP },
{ nfserr_toosmall, -ETOOSMALL },
{ nfserr_serverfault, -ESERVERFAULT },
};
int i;