#include <obd_class.h>
#include <lprocfs_status.h>
-extern cfs_list_t obd_types;
spinlock_t obd_types_lock;
struct kmem_cache *obd_device_cachep;
EXPORT_SYMBOL(obdo_cachep);
struct kmem_cache *import_cachep;
-cfs_list_t obd_zombie_imports;
-cfs_list_t obd_zombie_exports;
+struct list_head obd_zombie_imports;
+struct list_head obd_zombie_exports;
spinlock_t obd_zombie_impexp_lock;
static void obd_zombie_impexp_notify(void);
static void obd_zombie_export_add(struct obd_export *exp);
struct obd_type *class_search_type(const char *name)
{
- cfs_list_t *tmp;
+ struct list_head *tmp;
struct obd_type *type;
spin_lock(&obd_types_lock);
- cfs_list_for_each(tmp, &obd_types) {
- type = cfs_list_entry(tmp, struct obd_type, typ_chain);
+ list_for_each(tmp, &obd_types) {
+ type = list_entry(tmp, struct obd_type, typ_chain);
if (strcmp(type->typ_name, name) == 0) {
spin_unlock(&obd_types_lock);
return type;
#define CLASS_MAX_NAME 1024
int class_register_type(struct obd_ops *dt_ops, struct md_ops *md_ops,
- struct lprocfs_seq_vars *module_vars,
+ bool enable_proc, struct lprocfs_seq_vars *module_vars,
#ifndef HAVE_ONLY_PROCFS_SEQ
struct lprocfs_vars *vars,
#endif
spin_lock_init(&type->obd_type_lock);
#ifdef LPROCFS
+ if (enable_proc) {
#ifndef HAVE_ONLY_PROCFS_SEQ
- if (vars) {
- type->typ_procroot = lprocfs_register(type->typ_name,
- proc_lustre_root,
- vars, type);
- } else
+ if (vars) {
+ type->typ_procroot = lprocfs_register(type->typ_name,
+ proc_lustre_root,
+ vars, type);
+ } else
#endif
- {
- type->typ_procroot = lprocfs_seq_register(type->typ_name,
- proc_lustre_root,
- module_vars, type);
- }
- if (IS_ERR(type->typ_procroot)) {
- rc = PTR_ERR(type->typ_procroot);
- type->typ_procroot = NULL;
- GOTO (failed, rc);
+ {
+ type->typ_procroot = lprocfs_seq_register(type->typ_name,
+ proc_lustre_root,
+ module_vars, type);
+ }
+ if (IS_ERR(type->typ_procroot)) {
+ rc = PTR_ERR(type->typ_procroot);
+ type->typ_procroot = NULL;
+ GOTO(failed, rc);
+ }
}
#endif
if (ldt != NULL) {
}
spin_lock(&obd_types_lock);
- cfs_list_add(&type->typ_chain, &obd_types);
+ list_add(&type->typ_chain, &obd_types);
spin_unlock(&obd_types_lock);
RETURN (0);
- failed:
- if (type->typ_name != NULL)
- OBD_FREE(type->typ_name, strlen(name) + 1);
- if (type->typ_md_ops != NULL)
- OBD_FREE_PTR(type->typ_md_ops);
- if (type->typ_dt_ops != NULL)
- OBD_FREE_PTR(type->typ_dt_ops);
+failed:
+ if (type->typ_name != NULL) {
#ifdef LPROCFS
+ if (type->typ_procroot != NULL) {
#ifndef HAVE_ONLY_PROCFS_SEQ
- lprocfs_try_remove_proc_entry(type->typ_name, proc_lustre_root);
+ lprocfs_try_remove_proc_entry(type->typ_name,
+ proc_lustre_root);
#else
- remove_proc_subtree(type->typ_name, proc_lustre_root);
+ remove_proc_subtree(type->typ_name, proc_lustre_root);
#endif
+ }
#endif
+ OBD_FREE(type->typ_name, strlen(name) + 1);
+ }
+ if (type->typ_md_ops != NULL)
+ OBD_FREE_PTR(type->typ_md_ops);
+ if (type->typ_dt_ops != NULL)
+ OBD_FREE_PTR(type->typ_dt_ops);
OBD_FREE(type, sizeof(*type));
RETURN(rc);
}
* we can't reference pointer as it can get invalided when another
* module removes the entry */
#ifdef LPROCFS
+ if (type->typ_procroot != NULL) {
#ifndef HAVE_ONLY_PROCFS_SEQ
- lprocfs_try_remove_proc_entry(type->typ_name, proc_lustre_root);
+ lprocfs_try_remove_proc_entry(type->typ_name, proc_lustre_root);
#else
- remove_proc_subtree(type->typ_name, proc_lustre_root);
+ remove_proc_subtree(type->typ_name, proc_lustre_root);
#endif
+ }
+
+ if (type->typ_procsym != NULL)
+ lprocfs_remove(&type->typ_procsym);
#endif
if (type->typ_lu)
lu_device_type_fini(type->typ_lu);
spin_lock(&obd_types_lock);
- cfs_list_del(&type->typ_chain);
+ list_del(&type->typ_chain);
spin_unlock(&obd_types_lock);
OBD_FREE(type->typ_name, strlen(name) + 1);
if (type->typ_dt_ops != NULL)
if (exp->exp_connection)
ptlrpc_put_connection_superhack(exp->exp_connection);
- LASSERT(cfs_list_empty(&exp->exp_outstanding_replies));
- LASSERT(cfs_list_empty(&exp->exp_uncommitted_replies));
- LASSERT(cfs_list_empty(&exp->exp_req_replay_queue));
- LASSERT(cfs_list_empty(&exp->exp_hp_rpcs));
+ LASSERT(list_empty(&exp->exp_outstanding_replies));
+ LASSERT(list_empty(&exp->exp_uncommitted_replies));
+ LASSERT(list_empty(&exp->exp_req_replay_queue));
+ LASSERT(list_empty(&exp->exp_hp_rpcs));
obd_destroy_export(exp);
class_decref(obd, "export", exp);
atomic_read(&exp->exp_refcount) - 1);
if (atomic_dec_and_test(&exp->exp_refcount)) {
- LASSERT(!cfs_list_empty(&exp->exp_obd_chain));
+ LASSERT(!list_empty(&exp->exp_obd_chain));
CDEBUG(D_IOCTL, "final put %p/%s\n",
exp, exp->exp_client_uuid.uuid);
atomic_set(&export->exp_cb_count, 0);
atomic_set(&export->exp_locks_count, 0);
#if LUSTRE_TRACKS_LOCK_EXP_REFS
- CFS_INIT_LIST_HEAD(&export->exp_locks_list);
+ INIT_LIST_HEAD(&export->exp_locks_list);
spin_lock_init(&export->exp_locks_list_guard);
#endif
atomic_set(&export->exp_replay_count, 0);
export->exp_obd = obd;
- CFS_INIT_LIST_HEAD(&export->exp_outstanding_replies);
+ INIT_LIST_HEAD(&export->exp_outstanding_replies);
spin_lock_init(&export->exp_uncommitted_replies_lock);
- CFS_INIT_LIST_HEAD(&export->exp_uncommitted_replies);
- CFS_INIT_LIST_HEAD(&export->exp_req_replay_queue);
- CFS_INIT_LIST_HEAD(&export->exp_handle.h_link);
- CFS_INIT_LIST_HEAD(&export->exp_hp_rpcs);
- CFS_INIT_LIST_HEAD(&export->exp_reg_rpcs);
+ INIT_LIST_HEAD(&export->exp_uncommitted_replies);
+ INIT_LIST_HEAD(&export->exp_req_replay_queue);
+ INIT_LIST_HEAD(&export->exp_handle.h_link);
+ INIT_LIST_HEAD(&export->exp_hp_rpcs);
+ INIT_LIST_HEAD(&export->exp_reg_rpcs);
class_handle_hash(&export->exp_handle, &export_handle_ops);
export->exp_last_request_time = cfs_time_current_sec();
spin_lock_init(&export->exp_lock);
spin_lock_init(&export->exp_rpc_lock);
- CFS_INIT_HLIST_NODE(&export->exp_uuid_hash);
- CFS_INIT_HLIST_NODE(&export->exp_nid_hash);
+ INIT_HLIST_NODE(&export->exp_uuid_hash);
+ INIT_HLIST_NODE(&export->exp_nid_hash);
spin_lock_init(&export->exp_bl_list_lock);
- CFS_INIT_LIST_HEAD(&export->exp_bl_list);
+ INIT_LIST_HEAD(&export->exp_bl_list);
export->exp_sp_peer = LUSTRE_SP_ANY;
export->exp_flvr.sf_rpc = SPTLRPC_FLVR_INVALID;
}
class_incref(obd, "export", export);
- cfs_list_add(&export->exp_obd_chain, &export->exp_obd->obd_exports);
- cfs_list_add_tail(&export->exp_obd_chain_timed,
- &export->exp_obd->obd_exports_timed);
+ list_add(&export->exp_obd_chain, &export->exp_obd->obd_exports);
+ list_add_tail(&export->exp_obd_chain_timed,
+ &export->exp_obd->obd_exports_timed);
export->exp_obd->obd_num_exports++;
spin_unlock(&obd->obd_dev_lock);
cfs_hash_putref(hash);
if (hash)
cfs_hash_putref(hash);
class_handle_unhash(&export->exp_handle);
- LASSERT(cfs_hlist_unhashed(&export->exp_uuid_hash));
+ LASSERT(hlist_unhashed(&export->exp_uuid_hash));
obd_destroy_export(export);
OBD_FREE_PTR(export);
return ERR_PTR(rc);
spin_lock(&exp->exp_obd->obd_dev_lock);
/* delete an uuid-export hashitem from hashtables */
- if (!cfs_hlist_unhashed(&exp->exp_uuid_hash))
+ if (!hlist_unhashed(&exp->exp_uuid_hash))
cfs_hash_del(exp->exp_obd->obd_uuid_hash,
&exp->exp_client_uuid,
&exp->exp_uuid_hash);
- cfs_list_move(&exp->exp_obd_chain, &exp->exp_obd->obd_unlinked_exports);
- cfs_list_del_init(&exp->exp_obd_chain_timed);
+ list_move(&exp->exp_obd_chain, &exp->exp_obd->obd_unlinked_exports);
+ list_del_init(&exp->exp_obd_chain_timed);
exp->exp_obd->obd_num_exports--;
spin_unlock(&exp->exp_obd->obd_dev_lock);
class_export_put(exp);
ptlrpc_put_connection_superhack(imp->imp_connection);
- while (!cfs_list_empty(&imp->imp_conn_list)) {
- struct obd_import_conn *imp_conn;
+ while (!list_empty(&imp->imp_conn_list)) {
+ struct obd_import_conn *imp_conn;
- imp_conn = cfs_list_entry(imp->imp_conn_list.next,
- struct obd_import_conn, oic_item);
- cfs_list_del_init(&imp_conn->oic_item);
+ imp_conn = list_entry(imp->imp_conn_list.next,
+ struct obd_import_conn, oic_item);
+ list_del_init(&imp_conn->oic_item);
ptlrpc_put_connection_superhack(imp_conn->oic_conn);
OBD_FREE(imp_conn, sizeof(*imp_conn));
}
void class_import_put(struct obd_import *imp)
{
- ENTRY;
+ ENTRY;
- LASSERT(cfs_list_empty(&imp->imp_zombie_chain));
+ LASSERT(list_empty(&imp->imp_zombie_chain));
LASSERT_ATOMIC_GT_LT(&imp->imp_refcount, 0, LI_POISON);
CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", imp,
if (imp == NULL)
return NULL;
- CFS_INIT_LIST_HEAD(&imp->imp_pinger_chain);
- CFS_INIT_LIST_HEAD(&imp->imp_zombie_chain);
- CFS_INIT_LIST_HEAD(&imp->imp_replay_list);
- CFS_INIT_LIST_HEAD(&imp->imp_sending_list);
- CFS_INIT_LIST_HEAD(&imp->imp_delayed_list);
- CFS_INIT_LIST_HEAD(&imp->imp_committed_list);
+ INIT_LIST_HEAD(&imp->imp_pinger_chain);
+ INIT_LIST_HEAD(&imp->imp_zombie_chain);
+ INIT_LIST_HEAD(&imp->imp_replay_list);
+ INIT_LIST_HEAD(&imp->imp_sending_list);
+ INIT_LIST_HEAD(&imp->imp_delayed_list);
+ INIT_LIST_HEAD(&imp->imp_committed_list);
imp->imp_replay_cursor = &imp->imp_committed_list;
spin_lock_init(&imp->imp_lock);
imp->imp_last_success_conn = 0;
atomic_set(&imp->imp_inflight, 0);
atomic_set(&imp->imp_replay_inflight, 0);
atomic_set(&imp->imp_inval_count, 0);
- CFS_INIT_LIST_HEAD(&imp->imp_conn_list);
- CFS_INIT_LIST_HEAD(&imp->imp_handle.h_link);
+ INIT_LIST_HEAD(&imp->imp_conn_list);
+ INIT_LIST_HEAD(&imp->imp_handle.h_link);
class_handle_hash(&imp->imp_handle, &import_handle_ops);
init_imp_at(&imp->imp_at);
exp, lock, lock->l_exp_refs_target);
}
if ((lock->l_exp_refs_nr ++) == 0) {
- cfs_list_add(&lock->l_exp_refs_link, &exp->exp_locks_list);
+ list_add(&lock->l_exp_refs_link, &exp->exp_locks_list);
lock->l_exp_refs_target = exp;
}
CDEBUG(D_INFO, "lock = %p, export = %p, refs = %u\n",
lock, lock->l_exp_refs_target, exp);
}
if (-- lock->l_exp_refs_nr == 0) {
- cfs_list_del_init(&lock->l_exp_refs_link);
+ list_del_init(&lock->l_exp_refs_link);
lock->l_exp_refs_target = NULL;
}
CDEBUG(D_INFO, "lock = %p, export = %p, refs = %u\n",
struct obd_device *obd = exp->exp_obd;
spin_lock(&obd->obd_recovery_task_lock);
- if (exp->exp_delayed)
- obd->obd_delayed_clients--;
if (obd->obd_recovering) {
if (exp->exp_in_recovery) {
spin_lock(&exp->exp_lock);
exp->exp_obd->obd_stale_clients++;
}
spin_unlock(&obd->obd_recovery_task_lock);
+
+ spin_lock(&exp->exp_lock);
/** Cleanup req replay fields */
if (exp->exp_req_replay_needed) {
- spin_lock(&exp->exp_lock);
exp->exp_req_replay_needed = 0;
- spin_unlock(&exp->exp_lock);
+
LASSERT(atomic_read(&obd->obd_req_replay_clients));
atomic_dec(&obd->obd_req_replay_clients);
}
+
/** Cleanup lock replay data */
if (exp->exp_lock_replay_needed) {
- spin_lock(&exp->exp_lock);
exp->exp_lock_replay_needed = 0;
- spin_unlock(&exp->exp_lock);
+
LASSERT(atomic_read(&obd->obd_lock_replay_clients));
atomic_dec(&obd->obd_lock_replay_clients);
}
+ spin_unlock(&exp->exp_lock);
}
/* This function removes 1-3 references from the export:
* all end up in here, and if any of them race we shouldn't
* call extra class_export_puts(). */
if (already_disconnected) {
- LASSERT(cfs_hlist_unhashed(&export->exp_nid_hash));
+ LASSERT(hlist_unhashed(&export->exp_nid_hash));
GOTO(no_disconn, already_disconnected);
}
CDEBUG(D_IOCTL, "disconnect: cookie "LPX64"\n",
export->exp_handle.h_cookie);
- if (!cfs_hlist_unhashed(&export->exp_nid_hash))
+ if (!hlist_unhashed(&export->exp_nid_hash))
cfs_hash_del(export->exp_obd->obd_nid_hash,
&export->exp_connection->c_peer.nid,
&export->exp_nid_hash);
}
EXPORT_SYMBOL(class_connected_export);
-static void class_disconnect_export_list(cfs_list_t *list,
+static void class_disconnect_export_list(struct list_head *list,
enum obd_option flags)
{
int rc;
/* It's possible that an export may disconnect itself, but
* nothing else will be added to this list. */
- while (!cfs_list_empty(list)) {
- exp = cfs_list_entry(list->next, struct obd_export,
- exp_obd_chain);
- /* need for safe call CDEBUG after obd_disconnect */
- class_export_get(exp);
+ while (!list_empty(list)) {
+ exp = list_entry(list->next, struct obd_export,
+ exp_obd_chain);
+ /* need for safe call CDEBUG after obd_disconnect */
+ class_export_get(exp);
spin_lock(&exp->exp_lock);
exp->exp_flags = flags;
exp);
/* Need to delete this now so we don't end up pointing
* to work_list later when this export is cleaned up. */
- cfs_list_del_init(&exp->exp_obd_chain);
+ list_del_init(&exp->exp_obd_chain);
class_export_put(exp);
continue;
}
void class_disconnect_exports(struct obd_device *obd)
{
- cfs_list_t work_list;
+ struct list_head work_list;
ENTRY;
/* Move all of the exports from obd_exports to a work list, en masse. */
- CFS_INIT_LIST_HEAD(&work_list);
+ INIT_LIST_HEAD(&work_list);
spin_lock(&obd->obd_dev_lock);
- cfs_list_splice_init(&obd->obd_exports, &work_list);
- cfs_list_splice_init(&obd->obd_delayed_exports, &work_list);
+ list_splice_init(&obd->obd_exports, &work_list);
+ list_splice_init(&obd->obd_delayed_exports, &work_list);
spin_unlock(&obd->obd_dev_lock);
- if (!cfs_list_empty(&work_list)) {
+ if (!list_empty(&work_list)) {
CDEBUG(D_HA, "OBD device %d (%p) has exports, "
"disconnecting them\n", obd->obd_minor, obd);
class_disconnect_export_list(&work_list,
void class_disconnect_stale_exports(struct obd_device *obd,
int (*test_export)(struct obd_export *))
{
- cfs_list_t work_list;
+ struct list_head work_list;
struct obd_export *exp, *n;
int evicted = 0;
ENTRY;
- CFS_INIT_LIST_HEAD(&work_list);
+ INIT_LIST_HEAD(&work_list);
spin_lock(&obd->obd_dev_lock);
- cfs_list_for_each_entry_safe(exp, n, &obd->obd_exports,
- exp_obd_chain) {
+ list_for_each_entry_safe(exp, n, &obd->obd_exports,
+ exp_obd_chain) {
/* don't count self-export as client */
if (obd_uuid_equals(&exp->exp_client_uuid,
&exp->exp_obd->obd_uuid))
exp->exp_failed = 1;
spin_unlock(&exp->exp_lock);
- cfs_list_move(&exp->exp_obd_chain, &work_list);
+ list_move(&exp->exp_obd_chain, &work_list);
evicted++;
CDEBUG(D_HA, "%s: disconnect stale client %s@%s\n",
obd->obd_name, exp->exp_client_uuid.uuid,
int nreplies = 0;
spin_lock(&exp->exp_lock);
- cfs_list_for_each_entry(rs, &exp->exp_outstanding_replies,
- rs_exp_list) {
+ list_for_each_entry(rs, &exp->exp_outstanding_replies,
+ rs_exp_list) {
if (nreplies == 0)
first_reply = rs;
nreplies++;
struct obd_export *exp;
spin_lock(&obd->obd_dev_lock);
- cfs_list_for_each_entry(exp, &obd->obd_exports, exp_obd_chain)
+ list_for_each_entry(exp, &obd->obd_exports, exp_obd_chain)
print_export_data(exp, "ACTIVE", locks);
- cfs_list_for_each_entry(exp, &obd->obd_unlinked_exports, exp_obd_chain)
+ list_for_each_entry(exp, &obd->obd_unlinked_exports, exp_obd_chain)
print_export_data(exp, "UNLINKED", locks);
- cfs_list_for_each_entry(exp, &obd->obd_delayed_exports, exp_obd_chain)
+ list_for_each_entry(exp, &obd->obd_delayed_exports, exp_obd_chain)
print_export_data(exp, "DELAYED", locks);
spin_unlock(&obd->obd_dev_lock);
spin_lock(&obd_zombie_impexp_lock);
- cfs_list_for_each_entry(exp, &obd_zombie_exports, exp_obd_chain)
+ list_for_each_entry(exp, &obd_zombie_exports, exp_obd_chain)
print_export_data(exp, "ZOMBIE", locks);
spin_unlock(&obd_zombie_impexp_lock);
}
void obd_exports_barrier(struct obd_device *obd)
{
int waited = 2;
- LASSERT(cfs_list_empty(&obd->obd_exports));
+ LASSERT(list_empty(&obd->obd_exports));
spin_lock(&obd->obd_dev_lock);
- while (!cfs_list_empty(&obd->obd_unlinked_exports)) {
+ while (!list_empty(&obd->obd_unlinked_exports)) {
spin_unlock(&obd->obd_dev_lock);
schedule_timeout_and_set_state(TASK_UNINTERRUPTIBLE,
cfs_time_seconds(waited));
do {
spin_lock(&obd_zombie_impexp_lock);
- import = NULL;
- if (!cfs_list_empty(&obd_zombie_imports)) {
- import = cfs_list_entry(obd_zombie_imports.next,
- struct obd_import,
- imp_zombie_chain);
- cfs_list_del_init(&import->imp_zombie_chain);
- }
+ import = NULL;
+ if (!list_empty(&obd_zombie_imports)) {
+ import = list_entry(obd_zombie_imports.next,
+ struct obd_import,
+ imp_zombie_chain);
+ list_del_init(&import->imp_zombie_chain);
+ }
- export = NULL;
- if (!cfs_list_empty(&obd_zombie_exports)) {
- export = cfs_list_entry(obd_zombie_exports.next,
- struct obd_export,
- exp_obd_chain);
- cfs_list_del_init(&export->exp_obd_chain);
- }
+ export = NULL;
+ if (!list_empty(&obd_zombie_exports)) {
+ export = list_entry(obd_zombie_exports.next,
+ struct obd_export,
+ exp_obd_chain);
+ list_del_init(&export->exp_obd_chain);
+ }
spin_unlock(&obd_zombie_impexp_lock);
*/
static void obd_zombie_export_add(struct obd_export *exp) {
spin_lock(&exp->exp_obd->obd_dev_lock);
- LASSERT(!cfs_list_empty(&exp->exp_obd_chain));
- cfs_list_del_init(&exp->exp_obd_chain);
+ LASSERT(!list_empty(&exp->exp_obd_chain));
+ list_del_init(&exp->exp_obd_chain);
spin_unlock(&exp->exp_obd->obd_dev_lock);
spin_lock(&obd_zombie_impexp_lock);
zombies_count++;
- cfs_list_add(&exp->exp_obd_chain, &obd_zombie_exports);
+ list_add(&exp->exp_obd_chain, &obd_zombie_exports);
spin_unlock(&obd_zombie_impexp_lock);
obd_zombie_impexp_notify();
LASSERT(imp->imp_sec == NULL);
LASSERT(imp->imp_rq_pool == NULL);
spin_lock(&obd_zombie_impexp_lock);
- LASSERT(cfs_list_empty(&imp->imp_zombie_chain));
+ LASSERT(list_empty(&imp->imp_zombie_chain));
zombies_count++;
- cfs_list_add(&imp->imp_zombie_chain, &obd_zombie_imports);
+ list_add(&imp->imp_zombie_chain, &obd_zombie_imports);
spin_unlock(&obd_zombie_impexp_lock);
obd_zombie_impexp_notify();
struct task_struct *task;
#endif
- CFS_INIT_LIST_HEAD(&obd_zombie_imports);
- CFS_INIT_LIST_HEAD(&obd_zombie_exports);
+ INIT_LIST_HEAD(&obd_zombie_imports);
+
+ INIT_LIST_HEAD(&obd_zombie_exports);
spin_lock_init(&obd_zombie_impexp_lock);
init_completion(&obd_zombie_start);
init_completion(&obd_zombie_stop);
}
EXPORT_SYMBOL(kuc_free);
+struct obd_request_slot_waiter {
+ struct list_head orsw_entry;
+ wait_queue_head_t orsw_waitq;
+ bool orsw_signaled;
+};
+
+static bool obd_request_slot_avail(struct client_obd *cli,
+ struct obd_request_slot_waiter *orsw)
+{
+ bool avail;
+
+ client_obd_list_lock(&cli->cl_loi_list_lock);
+ avail = !!list_empty(&orsw->orsw_entry);
+ client_obd_list_unlock(&cli->cl_loi_list_lock);
+
+ return avail;
+};
+
+/*
+ * For network flow control, the RPC sponsor needs to acquire a credit
+ * before sending the RPC. The credits count for a connection is defined
+ * by the "cl_max_rpcs_in_flight". If all the credits are occpuied, then
+ * the subsequent RPC sponsors need to wait until others released their
+ * credits, or the administrator increased the "cl_max_rpcs_in_flight".
+ */
+int obd_get_request_slot(struct client_obd *cli)
+{
+ struct obd_request_slot_waiter orsw;
+ struct l_wait_info lwi;
+ int rc;
+
+ client_obd_list_lock(&cli->cl_loi_list_lock);
+ if (cli->cl_r_in_flight < cli->cl_max_rpcs_in_flight) {
+ cli->cl_r_in_flight++;
+ client_obd_list_unlock(&cli->cl_loi_list_lock);
+ return 0;
+ }
+
+ init_waitqueue_head(&orsw.orsw_waitq);
+ list_add_tail(&orsw.orsw_entry, &cli->cl_loi_read_list);
+ orsw.orsw_signaled = false;
+ client_obd_list_unlock(&cli->cl_loi_list_lock);
+
+ lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
+ rc = l_wait_event(orsw.orsw_waitq,
+ obd_request_slot_avail(cli, &orsw) ||
+ orsw.orsw_signaled,
+ &lwi);
+
+ /* Here, we must take the lock to avoid the on-stack 'orsw' to be
+ * freed but other (such as obd_put_request_slot) is using it. */
+ client_obd_list_lock(&cli->cl_loi_list_lock);
+ if (rc != 0) {
+ if (!orsw.orsw_signaled) {
+ if (list_empty(&orsw.orsw_entry))
+ cli->cl_r_in_flight--;
+ else
+ list_del(&orsw.orsw_entry);
+ }
+ }
+
+ if (orsw.orsw_signaled) {
+ LASSERT(list_empty(&orsw.orsw_entry));
+
+ rc = -EINTR;
+ }
+ client_obd_list_unlock(&cli->cl_loi_list_lock);
+
+ return rc;
+}
+EXPORT_SYMBOL(obd_get_request_slot);
+
+void obd_put_request_slot(struct client_obd *cli)
+{
+ struct obd_request_slot_waiter *orsw;
+
+ client_obd_list_lock(&cli->cl_loi_list_lock);
+ cli->cl_r_in_flight--;
+
+ /* If there is free slot, wakeup the first waiter. */
+ if (!list_empty(&cli->cl_loi_read_list) &&
+ likely(cli->cl_r_in_flight < cli->cl_max_rpcs_in_flight)) {
+ orsw = list_entry(cli->cl_loi_read_list.next,
+ struct obd_request_slot_waiter, orsw_entry);
+ list_del_init(&orsw->orsw_entry);
+ cli->cl_r_in_flight++;
+ wake_up(&orsw->orsw_waitq);
+ }
+ client_obd_list_unlock(&cli->cl_loi_list_lock);
+}
+EXPORT_SYMBOL(obd_put_request_slot);
+
+__u32 obd_get_max_rpcs_in_flight(struct client_obd *cli)
+{
+ return cli->cl_max_rpcs_in_flight;
+}
+EXPORT_SYMBOL(obd_get_max_rpcs_in_flight);
+
+int obd_set_max_rpcs_in_flight(struct client_obd *cli, __u32 max)
+{
+ struct obd_request_slot_waiter *orsw;
+ __u32 old;
+ int diff;
+ int i;
+
+ if (max > OBD_MAX_RIF_MAX || max < 1)
+ return -ERANGE;
+ client_obd_list_lock(&cli->cl_loi_list_lock);
+ old = cli->cl_max_rpcs_in_flight;
+ cli->cl_max_rpcs_in_flight = max;
+ diff = max - old;
+ /* We increase the max_rpcs_in_flight, then wakeup some waiters. */
+ for (i = 0; i < diff; i++) {
+ if (list_empty(&cli->cl_loi_read_list))
+ break;
+
+ orsw = list_entry(cli->cl_loi_read_list.next,
+ struct obd_request_slot_waiter, orsw_entry);
+ list_del_init(&orsw->orsw_entry);
+ cli->cl_r_in_flight++;
+ wake_up(&orsw->orsw_waitq);
+ }
+ client_obd_list_unlock(&cli->cl_loi_list_lock);
+
+ return 0;
+}
+EXPORT_SYMBOL(obd_set_max_rpcs_in_flight);
git://git.whamcloud.com / fs / lustre-release.git / blobdiff