static int seq_server_handle(struct lu_site *site,
const struct lu_env *env,
__u32 opc, struct lu_seq_range *out)
{
int rc;
struct seq_server_site *ss_site;
ENTRY;
ss_site = lu_site2seq(site);
switch (opc) {
case SEQ_ALLOC_META:
if (!ss_site->ss_server_seq) {
CERROR("Sequence server is not "
"initialized\n");
RETURN(-EINVAL);
}
rc = seq_server_alloc_meta(ss_site->ss_server_seq, out, env);
break;
case SEQ_ALLOC_SUPER:
if (!ss_site->ss_control_seq) {
CERROR("Sequence controller is not "
"initialized\n");
RETURN(-EINVAL);
}
rc = seq_server_alloc_super(ss_site->ss_control_seq, out, env);
break;
default:
rc = -EINVAL;
break;
}
RETURN(rc);
}
/* Request sequence-controller node to allocate new meta-sequence. */
static int seq_client_alloc_meta(const struct lu_env *env,
struct lu_client_seq *seq)
{
int rc;
ENTRY;
if (seq->lcs_srv) {
#ifdef HAVE_SEQ_SERVER
LASSERT(env != NULL);
rc = seq_server_alloc_meta(seq->lcs_srv, &seq->lcs_space, env);
#else
rc = 0;
#endif
} else {
do {
/* If meta server return -EINPROGRESS or EAGAIN,
* it means meta server might not be ready to
* allocate super sequence from sequence controller
* (MDT0)yet */
rc = seq_client_rpc(seq, &seq->lcs_space,
SEQ_ALLOC_META, "meta");
} while (rc == -EINPROGRESS || rc == -EAGAIN);
}
RETURN(rc);
}
/* Request sequence-controller node to allocate new meta-sequence. */
static int seq_client_alloc_meta(const struct lu_env *env,
struct lu_client_seq *seq)
{
int rc;
ENTRY;
#ifdef __KERNEL__
if (seq->lcs_srv) {
LASSERT(env != NULL);
rc = seq_server_alloc_meta(seq->lcs_srv, &seq->lcs_space, env);
} else {
#endif
rc = seq_client_rpc(seq, &seq->lcs_space,
SEQ_ALLOC_META, "meta");
#ifdef __KERNEL__
}
#endif
RETURN(rc);
}
/* Request sequence-controller node to allocate new meta-sequence. */
static int seq_client_alloc_meta(const struct lu_env *env,
struct lu_client_seq *seq)
{
int rc;
ENTRY;
if (seq->lcs_srv) {
#ifdef HAVE_SEQ_SERVER
LASSERT(env != NULL);
rc = seq_server_alloc_meta(seq->lcs_srv, &seq->lcs_space, env);
#else
rc = 0;
#endif
} else {
do {
/* If meta server return -EINPROGRESS or EAGAIN,
* it means meta server might not be ready to
* allocate super sequence from sequence controller
* (MDT0)yet */
rc = seq_client_rpc(seq, &seq->lcs_space,
SEQ_ALLOC_META, "meta");
if (rc == -EINPROGRESS || rc == -EAGAIN) {
wait_queue_head_t waitq;
struct l_wait_info lwi;
/* MDT0 is not ready, let's wait for 2
* seconds and retry. */
init_waitqueue_head(&waitq);
lwi = LWI_TIMEOUT(cfs_time_seconds(2), NULL,
NULL);
l_wait_event(waitq, 0, &lwi);
}
} while (rc == -EINPROGRESS || rc == -EAGAIN);
}
RETURN(rc);
}