struct lustre_handle *, int unref);
ldlm_mode_t ldlm_revalidate_lock_handle(struct lustre_handle *lockh,
__u64 *bits);
-struct ldlm_resource *ldlm_lock_convert(struct ldlm_lock *lock, int new_mode,
- __u32 *flags);
-void ldlm_lock_downgrade(struct ldlm_lock *lock, int new_mode);
void ldlm_lock_cancel(struct ldlm_lock *lock);
void ldlm_reprocess_all(struct ldlm_resource *res);
void ldlm_reprocess_all_ns(struct ldlm_namespace *ns);
struct lustre_handle *lockh);
int ldlm_server_ast(struct lustre_handle *lockh, struct ldlm_lock_desc *new,
void *data, __u32 data_len);
-int ldlm_cli_convert(struct lustre_handle *, int new_mode, __u32 *flags);
int ldlm_cli_update_pool(struct ptlrpc_request *req);
int ldlm_cli_cancel(struct lustre_handle *lockh,
ldlm_cancel_flags_t cancel_flags);
};
/**
- * Downgrade an exclusive lock.
- *
- * A fast variant of ldlm_lock_convert for conversion of exclusive
- * locks. The conversion is always successful.
- * Used by Commit on Sharing (COS) code.
- *
- * \param lock A lock to convert
- * \param new_mode new lock mode
- */
-void ldlm_lock_downgrade(struct ldlm_lock *lock, int new_mode)
-{
- LASSERT(lock->l_granted_mode & (LCK_PW | LCK_EX));
- LASSERT(new_mode == LCK_COS);
-
- lock_res_and_lock(lock);
- ldlm_resource_unlink_lock(lock);
- /*
- * Remove the lock from pool as it will be added again in
- * ldlm_grant_lock() called below.
- */
- ldlm_pool_del(&ldlm_lock_to_ns(lock)->ns_pool, lock);
-
- lock->l_req_mode = new_mode;
- ldlm_grant_lock(lock, NULL);
- unlock_res_and_lock(lock);
- ldlm_reprocess_all(lock->l_resource);
-}
-EXPORT_SYMBOL(ldlm_lock_downgrade);
-
-/**
- * Attempt to convert already granted lock to a different mode.
- *
- * While lock conversion is not currently used, future client-side
- * optimizations could take advantage of it to avoid discarding cached
- * pages on a file.
- */
-struct ldlm_resource *ldlm_lock_convert(struct ldlm_lock *lock, int new_mode,
- __u32 *flags)
-{
- LIST_HEAD(rpc_list);
- struct ldlm_resource *res;
- struct ldlm_namespace *ns;
- int granted = 0;
- struct ldlm_interval *node;
-
- /* Just return if mode is unchanged. */
- if (new_mode == lock->l_granted_mode) {
- *flags |= LDLM_FL_BLOCK_GRANTED;
- return lock->l_resource;
- }
-
- /* I can't check the type of lock here because the bitlock of lock
- * is not held here, so do the allocation blindly. -jay */
- OBD_SLAB_ALLOC_PTR_GFP(node, ldlm_interval_slab, GFP_NOFS);
- if (node == NULL)
- /* Actually, this causes EDEADLOCK to be returned */
- return NULL;
-
- LASSERTF((new_mode == LCK_PW && lock->l_granted_mode == LCK_PR),
- "new_mode %u, granted %u\n", new_mode, lock->l_granted_mode);
-
- lock_res_and_lock(lock);
-
- res = lock->l_resource;
- ns = ldlm_res_to_ns(res);
-
- lock->l_req_mode = new_mode;
- if (res->lr_type == LDLM_PLAIN || res->lr_type == LDLM_IBITS) {
- ldlm_resource_unlink_lock(lock);
- } else {
- ldlm_resource_unlink_lock(lock);
- if (res->lr_type == LDLM_EXTENT) {
- /* FIXME: ugly code, I have to attach the lock to a
- * interval node again since perhaps it will be granted
- * soon */
- INIT_LIST_HEAD(&node->li_group);
- ldlm_interval_attach(node, lock);
- node = NULL;
- }
- }
-
- /*
- * Remove old lock from the pool before adding the lock with new
- * mode below in ->policy()
- */
- ldlm_pool_del(&ns->ns_pool, lock);
-
- /* If this is a local resource, put it on the appropriate list. */
- if (ns_is_client(ldlm_res_to_ns(res))) {
- if (*flags & (LDLM_FL_BLOCK_CONV | LDLM_FL_BLOCK_GRANTED)) {
- ldlm_resource_add_lock(res, &res->lr_converting, lock);
- } else {
- /* This should never happen, because of the way the
- * server handles conversions. */
- LDLM_ERROR(lock, "Erroneous flags %x on local lock\n",
- *flags);
- LBUG();
-
- ldlm_grant_lock(lock, &rpc_list);
- granted = 1;
- /* FIXME: completion handling not with lr_lock held ! */
- if (lock->l_completion_ast)
- lock->l_completion_ast(lock, 0, NULL);
- }
- } else {
- CERROR("This is client-side-only module, cannot handle LDLM_NAMESPACE_SERVER resource type lock.\n");
- LBUG();
- }
- unlock_res_and_lock(lock);
-
- if (granted)
- ldlm_run_ast_work(ns, &rpc_list, LDLM_WORK_CP_AST);
- if (node)
- OBD_SLAB_FREE(node, ldlm_interval_slab, sizeof(*node));
- return res;
-}
-EXPORT_SYMBOL(ldlm_lock_convert);
-
-/**
* Print lock with lock handle \a lockh description into debug log.
*
* Used when printing all locks on a resource for debug purposes.
}
EXPORT_SYMBOL(ldlm_cli_enqueue);
-static int ldlm_cli_convert_local(struct ldlm_lock *lock, int new_mode,
- __u32 *flags)
-{
- struct ldlm_resource *res;
- int rc;
-
- if (ns_is_client(ldlm_lock_to_ns(lock))) {
- CERROR("Trying to cancel local lock\n");
- LBUG();
- }
- LDLM_DEBUG(lock, "client-side local convert");
-
- res = ldlm_lock_convert(lock, new_mode, flags);
- if (res) {
- ldlm_reprocess_all(res);
- rc = 0;
- } else {
- rc = LUSTRE_EDEADLK;
- }
- LDLM_DEBUG(lock, "client-side local convert handler END");
- LDLM_LOCK_PUT(lock);
- return rc;
-}
-
-/* FIXME: one of ldlm_cli_convert or the server side should reject attempted
- * conversion of locks which are on the waiting or converting queue */
-/* Caller of this code is supposed to take care of lock readers/writers
- accounting */
-int ldlm_cli_convert(struct lustre_handle *lockh, int new_mode, __u32 *flags)
-{
- struct ldlm_request *body;
- struct ldlm_reply *reply;
- struct ldlm_lock *lock;
- struct ldlm_resource *res;
- struct ptlrpc_request *req;
- int rc;
-
- lock = ldlm_handle2lock(lockh);
- if (!lock) {
- LBUG();
- return -EINVAL;
- }
- *flags = 0;
-
- if (lock->l_conn_export == NULL)
- return ldlm_cli_convert_local(lock, new_mode, flags);
-
- LDLM_DEBUG(lock, "client-side convert");
-
- req = ptlrpc_request_alloc_pack(class_exp2cliimp(lock->l_conn_export),
- &RQF_LDLM_CONVERT, LUSTRE_DLM_VERSION,
- LDLM_CONVERT);
- if (req == NULL) {
- LDLM_LOCK_PUT(lock);
- return -ENOMEM;
- }
-
- body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
- body->lock_handle[0] = lock->l_remote_handle;
-
- body->lock_desc.l_req_mode = new_mode;
- body->lock_flags = ldlm_flags_to_wire(*flags);
-
-
- ptlrpc_request_set_replen(req);
- rc = ptlrpc_queue_wait(req);
- if (rc != ELDLM_OK)
- goto out;
-
- reply = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
- if (reply == NULL) {
- rc = -EPROTO;
- goto out;
- }
-
- if (req->rq_status) {
- rc = req->rq_status;
- goto out;
- }
-
- res = ldlm_lock_convert(lock, new_mode, &reply->lock_flags);
- if (res != NULL) {
- ldlm_reprocess_all(res);
- /* Go to sleep until the lock is granted. */
- /* FIXME: or cancelled. */
- if (lock->l_completion_ast) {
- rc = lock->l_completion_ast(lock, LDLM_FL_WAIT_NOREPROC,
- NULL);
- if (rc)
- goto out;
- }
- } else {
- rc = LUSTRE_EDEADLK;
- }
- out:
- LDLM_LOCK_PUT(lock);
- ptlrpc_req_finished(req);
- return rc;
-}
-EXPORT_SYMBOL(ldlm_cli_convert);
-
/**
* Cancel locks locally.
* Returns:
projects / platform / kernel / linux-rpi.git / commitdiff