void (*create)(struct nfs4_client *);
void (*remove)(struct nfs4_client *);
int (*check)(struct nfs4_client *);
- void (*grace_done)(struct nfsd_net *, time_t);
+ void (*grace_done)(struct nfsd_net *);
};
/* Globals */
status = mnt_want_write_file(nn->rec_file);
if (status)
- return;
+ goto out_creds;
dir = nn->rec_file->f_path.dentry;
/* lock the parent */
user_recovery_dirname);
}
mnt_drop_write_file(nn->rec_file);
+out_creds:
nfs4_reset_creds(original_cred);
}
}
static void
-nfsd4_recdir_purge_old(struct nfsd_net *nn, time_t boot_time)
+nfsd4_recdir_purge_old(struct nfsd_net *nn)
{
int status;
return status;
}
+static void
+nfsd4_shutdown_recdir(struct net *net)
+{
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+
+ if (!nn->rec_file)
+ return;
+ fput(nn->rec_file);
+ nn->rec_file = NULL;
+}
static int
nfs4_legacy_state_init(struct net *net)
int status;
status = nfsd4_init_recdir(net);
- if (!status)
- status = nfsd4_recdir_load(net);
if (status)
- printk(KERN_ERR "NFSD: Failure reading reboot recovery data\n");
+ return status;
+
+ status = nfsd4_recdir_load(net);
+ if (status)
+ nfsd4_shutdown_recdir(net);
+
return status;
}
return status;
}
-static void
-nfsd4_shutdown_recdir(struct nfsd_net *nn)
-{
- if (!nn->rec_file)
- return;
- fput(nn->rec_file);
- nn->rec_file = NULL;
-}
-
static void
nfsd4_legacy_tracking_exit(struct net *net)
{
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
nfs4_release_reclaim(nn);
- nfsd4_shutdown_recdir(nn);
+ nfsd4_shutdown_recdir(net);
nfs4_legacy_state_shutdown(net);
}
}
static void
-nfsd4_cld_grace_done(struct nfsd_net *nn, time_t boot_time)
+nfsd4_cld_grace_done(struct nfsd_net *nn)
{
int ret;
struct cld_upcall *cup;
}
cup->cu_msg.cm_cmd = Cld_GraceDone;
- cup->cu_msg.cm_u.cm_gracetime = (int64_t)boot_time;
+ cup->cu_msg.cm_u.cm_gracetime = (int64_t)nn->boot_time;
ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
if (!ret)
ret = cup->cu_msg.cm_status;
#define LEGACY_TOPDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_TOPDIR="
#define LEGACY_RECDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_RECDIR="
+#define HAS_SESSION_ENV_PREFIX "NFSDCLTRACK_CLIENT_HAS_SESSION="
+#define GRACE_START_ENV_PREFIX "NFSDCLTRACK_GRACE_START="
static char *
nfsd4_cltrack_legacy_topdir(void)
return result;
}
+static char *
+nfsd4_cltrack_client_has_session(struct nfs4_client *clp)
+{
+ int copied;
+ size_t len;
+ char *result;
+
+ /* prefix + Y/N character + terminating NULL */
+ len = strlen(HAS_SESSION_ENV_PREFIX) + 1 + 1;
+
+ result = kmalloc(len, GFP_KERNEL);
+ if (!result)
+ return result;
+
+ copied = snprintf(result, len, HAS_SESSION_ENV_PREFIX "%c",
+ clp->cl_minorversion ? 'Y' : 'N');
+ if (copied >= len) {
+ /* just return nothing if output was truncated */
+ kfree(result);
+ return NULL;
+ }
+
+ return result;
+}
+
+static char *
+nfsd4_cltrack_grace_start(time_t grace_start)
+{
+ int copied;
+ size_t len;
+ char *result;
+
+ /* prefix + max width of int64_t string + terminating NULL */
+ len = strlen(GRACE_START_ENV_PREFIX) + 22 + 1;
+
+ result = kmalloc(len, GFP_KERNEL);
+ if (!result)
+ return result;
+
+ copied = snprintf(result, len, GRACE_START_ENV_PREFIX "%ld",
+ grace_start);
+ if (copied >= len) {
+ /* just return nothing if output was truncated */
+ kfree(result);
+ return NULL;
+ }
+
+ return result;
+}
+
static int
-nfsd4_umh_cltrack_upcall(char *cmd, char *arg, char *legacy)
+nfsd4_umh_cltrack_upcall(char *cmd, char *arg, char *env0, char *env1)
{
- char *envp[2];
+ char *envp[3];
char *argv[4];
int ret;
dprintk("%s: cmd: %s\n", __func__, cmd);
dprintk("%s: arg: %s\n", __func__, arg ? arg : "(null)");
- dprintk("%s: legacy: %s\n", __func__, legacy ? legacy : "(null)");
+ dprintk("%s: env0: %s\n", __func__, env0 ? env0 : "(null)");
+ dprintk("%s: env1: %s\n", __func__, env1 ? env1 : "(null)");
- envp[0] = legacy;
- envp[1] = NULL;
+ envp[0] = env0;
+ envp[1] = env1;
+ envp[2] = NULL;
argv[0] = (char *)cltrack_prog;
argv[1] = cmd;
}
static int
-nfsd4_umh_cltrack_init(struct net __attribute__((unused)) *net)
+nfsd4_umh_cltrack_init(struct net *net)
{
+ int ret;
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+ char *grace_start = nfsd4_cltrack_grace_start(nn->boot_time);
+
/* XXX: The usermode helper s not working in container yet. */
if (net != &init_net) {
WARN(1, KERN_ERR "NFSD: attempt to initialize umh client "
"tracking in a container!\n");
return -EINVAL;
}
- return nfsd4_umh_cltrack_upcall("init", NULL, NULL);
+
+ ret = nfsd4_umh_cltrack_upcall("init", NULL, grace_start, NULL);
+ kfree(grace_start);
+ return ret;
+}
+
+static void
+nfsd4_cltrack_upcall_lock(struct nfs4_client *clp)
+{
+ wait_on_bit_lock(&clp->cl_flags, NFSD4_CLIENT_UPCALL_LOCK,
+ TASK_UNINTERRUPTIBLE);
+}
+
+static void
+nfsd4_cltrack_upcall_unlock(struct nfs4_client *clp)
+{
+ smp_mb__before_atomic();
+ clear_bit(NFSD4_CLIENT_UPCALL_LOCK, &clp->cl_flags);
+ smp_mb__after_atomic();
+ wake_up_bit(&clp->cl_flags, NFSD4_CLIENT_UPCALL_LOCK);
}
static void
nfsd4_umh_cltrack_create(struct nfs4_client *clp)
{
- char *hexid;
+ char *hexid, *has_session, *grace_start;
+ struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
+
+ /*
+ * With v4.0 clients, there's little difference in outcome between a
+ * create and check operation, and we can end up calling into this
+ * function multiple times per client (once for each openowner). So,
+ * for v4.0 clients skip upcalling once the client has been recorded
+ * on stable storage.
+ *
+ * For v4.1+ clients, the outcome of the two operations is different,
+ * so we must ensure that we upcall for the create operation. v4.1+
+ * clients call this on RECLAIM_COMPLETE though, so we should only end
+ * up doing a single create upcall per client.
+ */
+ if (clp->cl_minorversion == 0 &&
+ test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
+ return;
hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
if (!hexid) {
dprintk("%s: can't allocate memory for upcall!\n", __func__);
return;
}
- nfsd4_umh_cltrack_upcall("create", hexid, NULL);
+
+ has_session = nfsd4_cltrack_client_has_session(clp);
+ grace_start = nfsd4_cltrack_grace_start(nn->boot_time);
+
+ nfsd4_cltrack_upcall_lock(clp);
+ if (!nfsd4_umh_cltrack_upcall("create", hexid, has_session, grace_start))
+ set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
+ nfsd4_cltrack_upcall_unlock(clp);
+
+ kfree(has_session);
+ kfree(grace_start);
kfree(hexid);
}
{
char *hexid;
+ if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
+ return;
+
hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
if (!hexid) {
dprintk("%s: can't allocate memory for upcall!\n", __func__);
return;
}
- nfsd4_umh_cltrack_upcall("remove", hexid, NULL);
+
+ nfsd4_cltrack_upcall_lock(clp);
+ if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags) &&
+ nfsd4_umh_cltrack_upcall("remove", hexid, NULL, NULL) == 0)
+ clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
+ nfsd4_cltrack_upcall_unlock(clp);
+
kfree(hexid);
}
nfsd4_umh_cltrack_check(struct nfs4_client *clp)
{
int ret;
- char *hexid, *legacy;
+ char *hexid, *has_session, *legacy;
+
+ if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
+ return 0;
hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
if (!hexid) {
dprintk("%s: can't allocate memory for upcall!\n", __func__);
return -ENOMEM;
}
+
+ has_session = nfsd4_cltrack_client_has_session(clp);
legacy = nfsd4_cltrack_legacy_recdir(&clp->cl_name);
- ret = nfsd4_umh_cltrack_upcall("check", hexid, legacy);
+
+ nfsd4_cltrack_upcall_lock(clp);
+ if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) {
+ ret = 0;
+ } else {
+ ret = nfsd4_umh_cltrack_upcall("check", hexid, has_session, legacy);
+ if (ret == 0)
+ set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
+ }
+ nfsd4_cltrack_upcall_unlock(clp);
+ kfree(has_session);
kfree(legacy);
kfree(hexid);
+
return ret;
}
static void
-nfsd4_umh_cltrack_grace_done(struct nfsd_net __attribute__((unused)) *nn,
- time_t boot_time)
+nfsd4_umh_cltrack_grace_done(struct nfsd_net *nn)
{
char *legacy;
char timestr[22]; /* FIXME: better way to determine max size? */
- sprintf(timestr, "%ld", boot_time);
+ sprintf(timestr, "%ld", nn->boot_time);
legacy = nfsd4_cltrack_legacy_topdir();
- nfsd4_umh_cltrack_upcall("gracedone", timestr, legacy);
+ nfsd4_umh_cltrack_upcall("gracedone", timestr, legacy, NULL);
kfree(legacy);
}
}
void
-nfsd4_record_grace_done(struct nfsd_net *nn, time_t boot_time)
+nfsd4_record_grace_done(struct nfsd_net *nn)
{
if (nn->client_tracking_ops)
- nn->client_tracking_ops->grace_done(nn, boot_time);
+ nn->client_tracking_ops->grace_done(nn);
}
static int
git.openpandora.org / pandora-kernel.git / blobdiff