The NFSv4 protocol allows state to be revoked by the admin and has error
codes which allow this to be communicated to the client.
This patch
- introduces a new state-id status NFS4_STID_ADMIN_REVOKE
which can be set on open, lock, or delegation state.
- reports NFS4ERR_ADMIN_REVOKED when these are accessed
- introduces a per-client counter of these states and returns
SEQ4_STATUS_ADMIN_STATE_REVOKED when the counter is not zero.
Decrements this when freeing any admin-revoked state.
- introduces stub code to find all interesting states for a given
superblock so they can be revoked via the 'unlock_filesystem'
file in /proc/fs/nfsd/
No actual states are handled yet.
Signed-off-by: NeilBrown <[email protected]>
---
fs/nfsd/nfs4state.c | 71 ++++++++++++++++++++++++++++++++++++++++++++-
fs/nfsd/nfsctl.c | 1 +
fs/nfsd/nfsd.h | 1 +
fs/nfsd/state.h | 10 +++++++
fs/nfsd/trace.h | 3 +-
5 files changed, 84 insertions(+), 2 deletions(-)
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index b1fdd0ee0f5c..a2b3320a6ba8 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1215,6 +1215,8 @@ nfs4_put_stid(struct nfs4_stid *s)
return;
}
idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
+ if (s->sc_status & NFS4_STID_ADMIN_REVOKED)
+ atomic_dec(&s->sc_client->cl_admin_revoked);
nfs4_free_cpntf_statelist(clp->net, s);
spin_unlock(&clp->cl_lock);
s->sc_free(s);
@@ -1534,6 +1536,8 @@ static void put_ol_stateid_locked(struct nfs4_ol_stateid *stp,
}
idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
+ if (s->sc_status & NFS4_STID_ADMIN_REVOKED)
+ atomic_dec(&s->sc_client->cl_admin_revoked);
list_add(&stp->st_locks, reaplist);
}
@@ -1679,6 +1683,54 @@ static void release_openowner(struct nfs4_openowner *oo)
nfs4_put_stateowner(&oo->oo_owner);
}
+static struct nfs4_stid *find_one_sb_stid(struct nfs4_client *clp,
+ struct super_block *sb,
+ unsigned int sc_types)
+{
+ unsigned long id, tmp;
+ struct nfs4_stid *stid;
+
+ spin_lock(&clp->cl_lock);
+ idr_for_each_entry_ul(&clp->cl_stateids, stid, tmp, id)
+ if ((stid->sc_type & sc_types) &&
+ stid->sc_status == 0 &&
+ stid->sc_file->fi_inode->i_sb == sb) {
+ refcount_inc(&stid->sc_count);
+ break;
+ }
+ spin_unlock(&clp->cl_lock);
+ return stid;
+}
+
+void nfsd4_revoke_states(struct net *net, struct super_block *sb)
+{
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+ unsigned int idhashval;
+ unsigned int sc_types;
+
+ sc_types = 0;
+
+ spin_lock(&nn->client_lock);
+ for (idhashval = 0; idhashval < CLIENT_HASH_MASK; idhashval++) {
+ struct list_head *head = &nn->conf_id_hashtbl[idhashval];
+ struct nfs4_client *clp;
+ retry:
+ list_for_each_entry(clp, head, cl_idhash) {
+ struct nfs4_stid *stid = find_one_sb_stid(clp, sb,
+ sc_types);
+ if (stid) {
+ spin_unlock(&nn->client_lock);
+ switch (stid->sc_type) {
+ }
+ nfs4_put_stid(stid);
+ spin_lock(&nn->client_lock);
+ goto retry;
+ }
+ }
+ }
+ spin_unlock(&nn->client_lock);
+}
+
static inline int
hash_sessionid(struct nfs4_sessionid *sessionid)
{
@@ -2550,6 +2602,8 @@ static int client_info_show(struct seq_file *m, void *v)
}
seq_printf(m, "callback state: %s\n", cb_state2str(clp->cl_cb_state));
seq_printf(m, "callback address: %pISpc\n", &clp->cl_cb_conn.cb_addr);
+ seq_printf(m, "admin-revoked states: %d\n",
+ atomic_read(&clp->cl_admin_revoked));
drop_client(clp);
return 0;
@@ -4109,6 +4163,8 @@ nfsd4_sequence(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
}
if (!list_empty(&clp->cl_revoked))
seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
+ if (atomic_read(&clp->cl_admin_revoked))
+ seq->status_flags |= SEQ4_STATUS_ADMIN_STATE_REVOKED;
out_no_session:
if (conn)
free_conn(conn);
@@ -4598,7 +4654,9 @@ nfsd4_verify_open_stid(struct nfs4_stid *s)
{
__be32 ret = nfs_ok;
- if (s->sc_status & NFS4_STID_REVOKED)
+ if (s->sc_status & NFS4_STID_ADMIN_REVOKED)
+ ret = nfserr_admin_revoked;
+ else if (s->sc_status & NFS4_STID_REVOKED)
ret = nfserr_deleg_revoked;
else if (s->sc_status & NFS4_STID_CLOSED)
ret = nfserr_bad_stateid;
@@ -5189,6 +5247,11 @@ nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
deleg = find_deleg_stateid(cl, &open->op_delegate_stateid);
if (deleg == NULL)
goto out;
+ if (deleg->dl_stid.sc_status & NFS4_STID_ADMIN_REVOKED) {
+ nfs4_put_stid(&deleg->dl_stid);
+ status = nfserr_admin_revoked;
+ goto out;
+ }
if (deleg->dl_stid.sc_status & NFS4_STID_REVOKED) {
nfs4_put_stid(&deleg->dl_stid);
status = nfserr_deleg_revoked;
@@ -6509,6 +6572,8 @@ nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
*/
statusmask |= NFS4_STID_REVOKED;
+ statusmask |= NFS4_STID_ADMIN_REVOKED;
+
if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
CLOSE_STATEID(stateid))
return nfserr_bad_stateid;
@@ -6527,6 +6592,10 @@ nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
nfs4_put_stid(stid);
return nfserr_deleg_revoked;
}
+ if (stid->sc_type & NFS4_STID_ADMIN_REVOKED) {
+ nfs4_put_stid(stid);
+ return nfserr_admin_revoked;
+ }
*s = stid;
return nfs_ok;
}
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 739ed5bf71cd..50368eec86b0 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -281,6 +281,7 @@ static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
* 3. Is that directory the root of an exported file system?
*/
error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
+ nfsd4_revoke_states(netns(file), path.dentry->d_sb);
path_put(&path);
return error;
diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h
index f5ff42f41ee7..d46203eac3c8 100644
--- a/fs/nfsd/nfsd.h
+++ b/fs/nfsd/nfsd.h
@@ -280,6 +280,7 @@ void nfsd_lockd_shutdown(void);
#define nfserr_no_grace cpu_to_be32(NFSERR_NO_GRACE)
#define nfserr_reclaim_bad cpu_to_be32(NFSERR_RECLAIM_BAD)
#define nfserr_badname cpu_to_be32(NFSERR_BADNAME)
+#define nfserr_admin_revoked cpu_to_be32(NFS4ERR_ADMIN_REVOKED)
#define nfserr_cb_path_down cpu_to_be32(NFSERR_CB_PATH_DOWN)
#define nfserr_locked cpu_to_be32(NFSERR_LOCKED)
#define nfserr_wrongsec cpu_to_be32(NFSERR_WRONGSEC)
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 22f9eb3986d2..18bc2889136c 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -112,6 +112,7 @@ struct nfs4_stid {
#define NFS4_STID_CLOSED BIT(0)
/* For a deleg stateid kept around only to process free_stateid's: */
#define NFS4_STID_REVOKED BIT(1)
+#define NFS4_STID_ADMIN_REVOKED BIT(2)
unsigned short sc_status;
struct list_head sc_cp_list;
@@ -388,6 +389,7 @@ struct nfs4_client {
clientid_t cl_clientid; /* generated by server */
nfs4_verifier cl_confirm; /* generated by server */
u32 cl_minorversion;
+ atomic_t cl_admin_revoked; /* count of admin-revoked states */
/* NFSv4.1 client implementation id: */
struct xdr_netobj cl_nii_domain;
struct xdr_netobj cl_nii_name;
@@ -752,6 +754,14 @@ static inline void get_nfs4_file(struct nfs4_file *fi)
}
struct nfsd_file *find_any_file(struct nfs4_file *f);
+#ifdef CONFIG_NFSD_V4
+void nfsd4_revoke_states(struct net *net, struct super_block *sb);
+#else
+static inline void nfsd4_revoke_states(struct net *net, struct super_block *sb)
+{
+}
+#endif
+
/* grace period management */
void nfsd4_end_grace(struct nfsd_net *nn);
diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
index 54d82e14d724..d0274d203f99 100644
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h
@@ -651,7 +651,8 @@ DEFINE_STATESEQID_EVENT(open_confirm);
#define show_stid_status(x) \
__print_flags(x, "|", \
{ NFS4_STID_CLOSED, "CLOSED" }, \
- { NFS4_STID_REVOKED, "REVOKED" }) \
+ { NFS4_STID_REVOKED, "REVOKED" }, \
+ { NFS4_STID_ADMIN_REVOKED, "ADMIN_REVOKED" })
DECLARE_EVENT_CLASS(nfsd_stid_class,
TP_PROTO(
--
2.42.0