From: NeilBrown <neilb@xxxxxxx>
__fh_verify() offers an interface like fh_verify() but doesn't require
a struct svc_rqst *, instead it also takes the specific parts as
explicit required arguments. So it is safe to call __fh_verify() with
a NULL rqstp, but the net, cred, and client args must not be NULL.
__fh_verify() does not use SVC_NET(), nor does the functions it calls.
Rather than using rqstp->rq_client pass the client and gssclient
explicitly to __fh_verify and then to nfsd_set_fh_dentry().
Lastly, it should be noted that the previous commit prepared for 4
associated tracepoints to only be used if rqstp is not NULL (this is a
stop-gap that should be properly fixed so localio also benefits from
the utility these tracepoints provide when debugging fh_verify
issues).
Signed-off-by: NeilBrown <neilb@xxxxxxx>
Co-developed-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
---
fs/nfsd/nfsfh.c | 91 ++++++++++++++++++++++++++++++++-----------------
1 file changed, 60 insertions(+), 31 deletions(-)
diff --git a/fs/nfsd/nfsfh.c b/fs/nfsd/nfsfh.c
index 60c2395d7af7..a77af71892a3 100644
--- a/fs/nfsd/nfsfh.c
+++ b/fs/nfsd/nfsfh.c
@@ -142,7 +142,11 @@ static inline __be32 check_pseudo_root(struct dentry *dentry,
* dentry. On success, the results are used to set fh_export and
* fh_dentry.
*/
-static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp)
+static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct net *net,
+ struct svc_cred *cred,
+ struct auth_domain *client,
+ struct auth_domain *gssclient,
+ struct svc_fh *fhp)
{
struct knfsd_fh *fh = &fhp->fh_handle;
struct fid *fid = NULL;
@@ -184,8 +188,8 @@ static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp)
data_left -= len;
if (data_left < 0)
return error;
- exp = rqst_exp_find(&rqstp->rq_chandle, SVC_NET(rqstp),
- rqstp->rq_client, rqstp->rq_gssclient,
+ exp = rqst_exp_find(rqstp ? &rqstp->rq_chandle : NULL,
+ net, client, gssclient,
fh->fh_fsid_type, fh->fh_fsid);
fid = (struct fid *)(fh->fh_fsid + len);
@@ -220,7 +224,7 @@ static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp)
put_cred(override_creds(new));
put_cred(new);
} else {
- error = nfsd_setuser_and_check_port(rqstp, &rqstp->rq_cred, exp);
+ error = nfsd_setuser_and_check_port(rqstp, cred, exp);
if (error)
goto out;
}
@@ -295,42 +299,33 @@ static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp)
}
/**
- * fh_verify - filehandle lookup and access checking
- * @rqstp: pointer to current rpc request
+ * __fh_verify - filehandle lookup and access checking
+ * @rqstp: RPC transaction context, or NULL
+ * @net: net namespace in which to perform the export lookup
+ * @cred: RPC user credential
+ * @client: RPC auth domain
+ * @gssclient: RPC GSS auth domain, or NULL
* @fhp: filehandle to be verified
* @type: expected type of object pointed to by filehandle
* @access: type of access needed to object
*
- * Look up a dentry from the on-the-wire filehandle, check the client's
- * access to the export, and set the current task's credentials.
- *
- * Regardless of success or failure of fh_verify(), fh_put() should be
- * called on @fhp when the caller is finished with the filehandle.
- *
- * fh_verify() may be called multiple times on a given filehandle, for
- * example, when processing an NFSv4 compound. The first call will look
- * up a dentry using the on-the-wire filehandle. Subsequent calls will
- * skip the lookup and just perform the other checks and possibly change
- * the current task's credentials.
- *
- * @type specifies the type of object expected using one of the S_IF*
- * constants defined in include/linux/stat.h. The caller may use zero
- * to indicate that it doesn't care, or a negative integer to indicate
- * that it expects something not of the given type.
- *
- * @access is formed from the NFSD_MAY_* constants defined in
- * fs/nfsd/vfs.h.
+ * See fh_verify() for further descriptions of @fhp, @type, and @access.
*/
-__be32
-fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, int access)
+static __be32
+__fh_verify(struct svc_rqst *rqstp,
+ struct net *net, struct svc_cred *cred,
+ struct auth_domain *client,
+ struct auth_domain *gssclient,
+ struct svc_fh *fhp, umode_t type, int access)
{
- struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
struct svc_export *exp = NULL;
struct dentry *dentry;
__be32 error;
if (!fhp->fh_dentry) {
- error = nfsd_set_fh_dentry(rqstp, fhp);
+ error = nfsd_set_fh_dentry(rqstp, net, cred, client,
+ gssclient, fhp);
if (error)
goto out;
}
@@ -359,7 +354,7 @@ fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, int access)
if (error)
goto out;
- error = nfsd_setuser_and_check_port(rqstp, &rqstp->rq_cred, exp);
+ error = nfsd_setuser_and_check_port(rqstp, cred, exp);
if (error)
goto out;
@@ -389,7 +384,7 @@ fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, int access)
skip_pseudoflavor_check:
/* Finally, check access permissions. */
- error = nfsd_permission(&rqstp->rq_cred, exp, dentry, access);
+ error = nfsd_permission(cred, exp, dentry, access);
out:
trace_nfsd_fh_verify_err(rqstp, fhp, type, access, error);
if (error == nfserr_stale)
@@ -397,6 +392,40 @@ fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, int access)
return error;
}
+/**
+ * fh_verify - filehandle lookup and access checking
+ * @rqstp: pointer to current rpc request
+ * @fhp: filehandle to be verified
+ * @type: expected type of object pointed to by filehandle
+ * @access: type of access needed to object
+ *
+ * Look up a dentry from the on-the-wire filehandle, check the client's
+ * access to the export, and set the current task's credentials.
+ *
+ * Regardless of success or failure of fh_verify(), fh_put() should be
+ * called on @fhp when the caller is finished with the filehandle.
+ *
+ * fh_verify() may be called multiple times on a given filehandle, for
+ * example, when processing an NFSv4 compound. The first call will look
+ * up a dentry using the on-the-wire filehandle. Subsequent calls will
+ * skip the lookup and just perform the other checks and possibly change
+ * the current task's credentials.
+ *
+ * @type specifies the type of object expected using one of the S_IF*
+ * constants defined in include/linux/stat.h. The caller may use zero
+ * to indicate that it doesn't care, or a negative integer to indicate
+ * that it expects something not of the given type.
+ *
+ * @access is formed from the NFSD_MAY_* constants defined in
+ * fs/nfsd/vfs.h.
+ */
+__be32
+fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, int access)
+{
+ return __fh_verify(rqstp, SVC_NET(rqstp), &rqstp->rq_cred,
+ rqstp->rq_client, rqstp->rq_gssclient,
+ fhp, type, access);
+}
/*
* Compose a file handle for an NFS reply.
--
2.44.0
