* Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
- * Copyright (c) 2010, 2011, Whamcloud, Inc.
+ * Copyright (c) 2010, 2013, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*/
+/**
+ * This file contains Asynchronous System Trap (AST) handlers and related
+ * LDLM request-processing routines.
+ *
+ * An AST is a callback issued on a lock when its state is changed. There are
+ * several different types of ASTs (callbacks) registered for each lock:
+ *
+ * - completion AST: when a lock is enqueued by some process, but cannot be
+ * granted immediately due to other conflicting locks on the same resource,
+ * the completion AST is sent to notify the caller when the lock is
+ * eventually granted
+ *
+ * - blocking AST: when a lock is granted to some process, if another process
+ * enqueues a conflicting (blocking) lock on a resource, a blocking AST is
+ * sent to notify the holder(s) of the lock(s) of the conflicting lock
+ * request. The lock holder(s) must release their lock(s) on that resource in
+ * a timely manner or be evicted by the server.
+ *
+ * - glimpse AST: this is used when a process wants information about a lock
+ * (i.e. the lock value block (LVB)) but does not necessarily require holding
+ * the lock. If the resource is locked, the lock holder(s) are sent glimpse
+ * ASTs and the LVB is returned to the caller, and lock holder(s) may CANCEL
+ * their lock(s) if they are idle. If the resource is not locked, the server
+ * may grant the lock.
+ */
#define DEBUG_SUBSYSTEM S_LDLM
#ifndef __KERNEL__
if (lock->l_conn_export == NULL) {
static cfs_time_t next_dump = 0, last_dump = 0;
- if (ptlrpc_check_suspend())
- RETURN(0);
-
- LDLM_ERROR(lock, "lock timed out (enqueued at "CFS_TIME_T", "
- CFS_DURATION_T"s ago); not entering recovery in "
- "server code, just going back to sleep",
- lock->l_last_activity,
- cfs_time_sub(cfs_time_current_sec(),
- lock->l_last_activity));
+ LCONSOLE_WARN("lock timed out (enqueued at "CFS_TIME_T", "
+ CFS_DURATION_T"s ago)\n",
+ lock->l_last_activity,
+ cfs_time_sub(cfs_time_current_sec(),
+ lock->l_last_activity));
+ LDLM_DEBUG(lock, "lock timed out (enqueued at "CFS_TIME_T", "
+ CFS_DURATION_T"s ago); not entering recovery in "
+ "server code, just going back to sleep",
+ lock->l_last_activity,
+ cfs_time_sub(cfs_time_current_sec(),
+ lock->l_last_activity));
if (cfs_time_after(cfs_time_current(), next_dump)) {
last_dump = next_dump;
next_dump = cfs_time_shift(300);
*/
static int ldlm_completion_tail(struct ldlm_lock *lock)
{
- long delay;
- int result;
-
- if (lock->l_destroyed || lock->l_flags & LDLM_FL_FAILED) {
- LDLM_DEBUG(lock, "client-side enqueue: destroyed");
- result = -EIO;
- } else {
- delay = cfs_time_sub(cfs_time_current_sec(),
- lock->l_last_activity);
- LDLM_DEBUG(lock, "client-side enqueue: granted after "
- CFS_DURATION_T"s", delay);
-
- /* Update our time estimate */
- at_measured(ldlm_lock_to_ns_at(lock),
- delay);
- result = 0;
- }
- return result;
+ long delay;
+ int result;
+
+ if (ldlm_is_destroyed(lock) || ldlm_is_failed(lock)) {
+ LDLM_DEBUG(lock, "client-side enqueue: destroyed");
+ result = -EIO;
+ } else {
+ delay = cfs_time_sub(cfs_time_current_sec(),
+ lock->l_last_activity);
+ LDLM_DEBUG(lock, "client-side enqueue: granted after "
+ CFS_DURATION_T"s", delay);
+
+ /* Update our time estimate */
+ at_measured(ldlm_lock_to_ns_at(lock),
+ delay);
+ result = 0;
+ }
+ return result;
}
/**
*/
int ldlm_completion_ast_async(struct ldlm_lock *lock, __u64 flags, void *data)
{
- ENTRY;
+ ENTRY;
- if (flags == LDLM_FL_WAIT_NOREPROC) {
- LDLM_DEBUG(lock, "client-side enqueue waiting on pending lock");
- RETURN(0);
- }
-
- if (!(flags & (LDLM_FL_BLOCK_WAIT | LDLM_FL_BLOCK_GRANTED |
- LDLM_FL_BLOCK_CONV))) {
- cfs_waitq_signal(&lock->l_waitq);
- RETURN(ldlm_completion_tail(lock));
- }
-
- LDLM_DEBUG(lock, "client-side enqueue returned a blocked lock, "
- "going forward");
- ldlm_reprocess_all(lock->l_resource);
- RETURN(0);
+ if (flags == LDLM_FL_WAIT_NOREPROC) {
+ LDLM_DEBUG(lock, "client-side enqueue waiting on pending lock");
+ RETURN(0);
+ }
+
+ if (!(flags & (LDLM_FL_BLOCK_WAIT | LDLM_FL_BLOCK_GRANTED |
+ LDLM_FL_BLOCK_CONV))) {
+ wake_up(&lock->l_waitq);
+ RETURN(ldlm_completion_tail(lock));
+ }
+
+ LDLM_DEBUG(lock, "client-side enqueue returned a blocked lock, "
+ "going forward");
+ ldlm_reprocess_all(lock->l_resource);
+ RETURN(0);
}
EXPORT_SYMBOL(ldlm_completion_ast_async);
/**
- * Client side LDLM "completion" AST. This is called in several cases:
+ * Generic LDLM "completion" AST. This is called in several cases:
*
- * - when a reply to an ENQUEUE rpc is received from the server
+ * - when a reply to an ENQUEUE RPC is received from the server
* (ldlm_cli_enqueue_fini()). Lock might be granted or not granted at
* this point (determined by flags);
*
- * - when LDLM_CP_CALLBACK rpc comes to client to notify it that lock has
+ * - when LDLM_CP_CALLBACK RPC comes to client to notify it that lock has
* been granted;
*
* - when ldlm_lock_match(LDLM_FL_LVB_READY) is about to wait until lock
goto noreproc;
}
- if (!(flags & (LDLM_FL_BLOCK_WAIT | LDLM_FL_BLOCK_GRANTED |
- LDLM_FL_BLOCK_CONV))) {
- cfs_waitq_signal(&lock->l_waitq);
- RETURN(0);
- }
+ if (!(flags & (LDLM_FL_BLOCK_WAIT | LDLM_FL_BLOCK_GRANTED |
+ LDLM_FL_BLOCK_CONV))) {
+ wake_up(&lock->l_waitq);
+ RETURN(0);
+ }
LDLM_DEBUG(lock, "client-side enqueue returned a blocked lock, "
"sleeping");
lwd.lwd_lock = lock;
- if (lock->l_flags & LDLM_FL_NO_TIMEOUT) {
+ if (ldlm_is_no_timeout(lock)) {
LDLM_DEBUG(lock, "waiting indefinitely because of NO_TIMEOUT");
lwi = LWI_INTR(interrupted_completion_wait, &lwd);
} else {
interrupted_completion_wait, &lwd);
}
- if (imp != NULL) {
- cfs_spin_lock(&imp->imp_lock);
- lwd.lwd_conn_cnt = imp->imp_conn_cnt;
- cfs_spin_unlock(&imp->imp_lock);
- }
+ if (imp != NULL) {
+ spin_lock(&imp->imp_lock);
+ lwd.lwd_conn_cnt = imp->imp_conn_cnt;
+ spin_unlock(&imp->imp_lock);
+ }
if (ns_is_client(ldlm_lock_to_ns(lock)) &&
OBD_FAIL_CHECK_RESET(OBD_FAIL_LDLM_INTR_CP_AST,
OBD_FAIL_LDLM_CP_BL_RACE | OBD_FAIL_ONCE)) {
- lock->l_flags |= LDLM_FL_FAIL_LOC;
+ ldlm_set_fail_loc(lock);
rc = -EINTR;
} else {
/* Go to sleep until the lock is granted or cancelled. */
EXPORT_SYMBOL(ldlm_completion_ast);
/**
- * A helper to build a blocking ast function
+ * A helper to build a blocking AST function
*
- * Perform a common operation for blocking asts:
+ * Perform a common operation for blocking ASTs:
* defferred lock cancellation.
*
- * \param lock the lock blocking or canceling ast was called on
+ * \param lock the lock blocking or canceling AST was called on
* \retval 0
* \see mdt_blocking_ast
* \see ldlm_blocking_ast
int do_ast;
ENTRY;
- lock->l_flags |= LDLM_FL_CBPENDING;
+ ldlm_set_cbpending(lock);
do_ast = (!lock->l_readers && !lock->l_writers);
unlock_res_and_lock(lock);
LDLM_DEBUG(lock, "already unused, calling ldlm_cli_cancel");
ldlm_lock2handle(lock, &lockh);
- rc = ldlm_cli_cancel(&lockh);
+ rc = ldlm_cli_cancel(&lockh, LCF_ASYNC);
if (rc < 0)
CERROR("ldlm_cli_cancel: %d\n", rc);
} else {
}
EXPORT_SYMBOL(ldlm_blocking_ast);
-/*
+/**
* ->l_glimpse_ast() for DLM extent locks acquired on the server-side. See
* comment in filter_intent_policy() on why you may need this.
*/
}
EXPORT_SYMBOL(ldlm_glimpse_ast);
+/**
+ * Enqueue a local lock (typically on a server).
+ */
int ldlm_cli_enqueue_local(struct ldlm_namespace *ns,
const struct ldlm_res_id *res_id,
ldlm_type_t type, ldlm_policy_data_t *policy,
ldlm_blocking_callback blocking,
ldlm_completion_callback completion,
ldlm_glimpse_callback glimpse,
- void *data, __u32 lvb_len,
+ void *data, __u32 lvb_len, enum lvb_type lvb_type,
const __u64 *client_cookie,
struct lustre_handle *lockh)
{
LBUG();
}
- lock = ldlm_lock_create(ns, res_id, type, mode, &cbs, data, lvb_len);
+ lock = ldlm_lock_create(ns, res_id, type, mode, &cbs, data, lvb_len,
+ lvb_type);
if (unlikely(!lock))
GOTO(out_nolock, err = -ENOMEM);
/* NB: we don't have any lock now (lock_res_and_lock)
* because it's a new lock */
ldlm_lock_addref_internal_nolock(lock, mode);
- lock->l_flags |= LDLM_FL_LOCAL;
+ ldlm_set_local(lock);
if (*flags & LDLM_FL_ATOMIC_CB)
- lock->l_flags |= LDLM_FL_ATOMIC_CB;
+ ldlm_set_atomic_cb(lock);
if (policy != NULL)
lock->l_policy_data = *policy;
if (client_cookie != NULL)
lock->l_client_cookie = *client_cookie;
- if (type == LDLM_EXTENT)
- lock->l_req_extent = policy->l_extent;
+ if (type == LDLM_EXTENT) {
+ /* extent lock without policy is a bug */
+ if (policy == NULL)
+ LBUG();
+
+ lock->l_req_extent = policy->l_extent;
+ }
err = ldlm_lock_enqueue(ns, &lock, policy, flags);
if (unlikely(err != ELDLM_OK))
lock_res_and_lock(lock);
/* Check that lock is not granted or failed, we might race. */
if ((lock->l_req_mode != lock->l_granted_mode) &&
- !(lock->l_flags & LDLM_FL_FAILED)) {
- /* Make sure that this lock will not be found by raced
- * bl_ast and -EINVAL reply is sent to server anyways.
- * bug 17645 */
- lock->l_flags |= LDLM_FL_LOCAL_ONLY | LDLM_FL_FAILED |
- LDLM_FL_ATOMIC_CB | LDLM_FL_CBPENDING;
- need_cancel = 1;
+ !ldlm_is_failed(lock)) {
+ /* Make sure that this lock will not be found by raced
+ * bl_ast and -EINVAL reply is sent to server anyways.
+ * b=17645*/
+ lock->l_flags |= LDLM_FL_LOCAL_ONLY | LDLM_FL_FAILED |
+ LDLM_FL_ATOMIC_CB | LDLM_FL_CBPENDING;
+ need_cancel = 1;
}
unlock_res_and_lock(lock);
}
}
+/**
+ * Finishing portion of client lock enqueue code.
+ *
+ * Called after receiving reply from server.
+ */
int ldlm_cli_enqueue_fini(struct obd_export *exp, struct ptlrpc_request *req,
ldlm_type_t type, __u8 with_policy, ldlm_mode_t mode,
__u64 *flags, void *lvb, __u32 lvb_len,
int is_replay = *flags & LDLM_FL_REPLAY;
struct ldlm_lock *lock;
struct ldlm_reply *reply;
- struct ost_lvb *tmplvb;
int cleanup_phase = 1;
+ int size = 0;
ENTRY;
lock = ldlm_handle2lock(lockh);
RETURN(-ENOLCK);
}
+ LASSERTF(ergo(lvb_len != 0, lvb_len == lock->l_lvb_len),
+ "lvb_len = %d, l_lvb_len = %d\n", lvb_len, lock->l_lvb_len);
+
if (rc != ELDLM_OK) {
LASSERT(!is_replay);
LDLM_DEBUG(lock, "client-side enqueue END (%s)",
rc == ELDLM_LOCK_ABORTED ? "ABORTED" : "FAILED");
- if (rc == ELDLM_LOCK_ABORTED) {
- /* Before we return, swab the reply */
- reply = req_capsule_server_get(&req->rq_pill,
- &RMF_DLM_REP);
- if (reply == NULL)
- rc = -EPROTO;
- if (lvb_len) {
-
- req_capsule_set_size(&req->rq_pill,
- &RMF_DLM_LVB, RCL_SERVER,
- lvb_len);
- tmplvb = req_capsule_server_get(&req->rq_pill,
- &RMF_DLM_LVB);
- if (tmplvb == NULL)
- GOTO(cleanup, rc = -EPROTO);
- if (lvb != NULL)
- memcpy(lvb, tmplvb, lvb_len);
- }
- }
- GOTO(cleanup, rc);
- }
- reply = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
- if (reply == NULL)
- GOTO(cleanup, rc = -EPROTO);
+ if (rc != ELDLM_LOCK_ABORTED)
+ GOTO(cleanup, rc);
+ }
+
+ /* Before we return, swab the reply */
+ reply = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
+ if (reply == NULL)
+ GOTO(cleanup, rc = -EPROTO);
+
+ if (lvb_len != 0) {
+ LASSERT(lvb != NULL);
+
+ size = req_capsule_get_size(&req->rq_pill, &RMF_DLM_LVB,
+ RCL_SERVER);
+ if (size < 0) {
+ LDLM_ERROR(lock, "Fail to get lvb_len, rc = %d", size);
+ GOTO(cleanup, rc = size);
+ } else if (unlikely(size > lvb_len)) {
+ LDLM_ERROR(lock, "Replied LVB is larger than "
+ "expectation, expected = %d, replied = %d",
+ lvb_len, size);
+ GOTO(cleanup, rc = -EINVAL);
+ }
+ }
+
+ if (rc == ELDLM_LOCK_ABORTED) {
+ if (lvb_len != 0)
+ rc = ldlm_fill_lvb(lock, &req->rq_pill, RCL_SERVER,
+ lvb, size);
+ GOTO(cleanup, rc = (rc != 0 ? rc : ELDLM_LOCK_ABORTED));
+ }
/* lock enqueued on the server */
cleanup_phase = 0;
*flags = ldlm_flags_from_wire(reply->lock_flags);
lock->l_flags |= ldlm_flags_from_wire(reply->lock_flags &
- LDLM_INHERIT_FLAGS);
+ LDLM_FL_INHERIT_MASK);
/* move NO_TIMEOUT flag to the lock to force ldlm_lock_match()
* to wait with no timeout as well */
lock->l_flags |= ldlm_flags_from_wire(reply->lock_flags &
lock->l_req_mode = newmode;
}
- if (memcmp(reply->lock_desc.l_resource.lr_name.name,
- lock->l_resource->lr_name.name,
- sizeof(struct ldlm_res_id))) {
- CDEBUG(D_INFO, "remote intent success, locking "
- "(%ld,%ld,%ld) instead of "
- "(%ld,%ld,%ld)\n",
- (long)reply->lock_desc.l_resource.lr_name.name[0],
- (long)reply->lock_desc.l_resource.lr_name.name[1],
- (long)reply->lock_desc.l_resource.lr_name.name[2],
- (long)lock->l_resource->lr_name.name[0],
- (long)lock->l_resource->lr_name.name[1],
- (long)lock->l_resource->lr_name.name[2]);
-
- rc = ldlm_lock_change_resource(ns, lock,
- &reply->lock_desc.l_resource.lr_name);
- if (rc || lock->l_resource == NULL)
- GOTO(cleanup, rc = -ENOMEM);
- LDLM_DEBUG(lock, "client-side enqueue, new resource");
- }
- if (with_policy)
- if (!(type == LDLM_IBITS && !(exp->exp_connect_flags &
- OBD_CONNECT_IBITS)))
- /* We assume lock type cannot change on server*/
- ldlm_convert_policy_to_local(exp,
- lock->l_resource->lr_type,
- &reply->lock_desc.l_policy_data,
- &lock->l_policy_data);
+ if (!ldlm_res_eq(&reply->lock_desc.l_resource.lr_name,
+ &lock->l_resource->lr_name)) {
+ CDEBUG(D_INFO, "remote intent success, locking "DLDLMRES
+ " instead of "DLDLMRES"\n",
+ PLDLMRES(&reply->lock_desc.l_resource),
+ PLDLMRES(lock->l_resource));
+
+ rc = ldlm_lock_change_resource(ns, lock,
+ &reply->lock_desc.l_resource.lr_name);
+ if (rc || lock->l_resource == NULL)
+ GOTO(cleanup, rc = -ENOMEM);
+ LDLM_DEBUG(lock, "client-side enqueue, new resource");
+ }
+ if (with_policy)
+ if (!(type == LDLM_IBITS &&
+ !(exp_connect_flags(exp) & OBD_CONNECT_IBITS)))
+ /* We assume lock type cannot change on server*/
+ ldlm_convert_policy_to_local(exp,
+ lock->l_resource->lr_type,
+ &reply->lock_desc.l_policy_data,
+ &lock->l_policy_data);
if (type != LDLM_PLAIN)
LDLM_DEBUG(lock,"client-side enqueue, new policy data");
}
* bug 7311). */
(LIBLUSTRE_CLIENT && type == LDLM_EXTENT)) {
lock_res_and_lock(lock);
- lock->l_flags |= LDLM_FL_CBPENDING | LDLM_FL_BL_AST;
+ lock->l_flags |= LDLM_FL_CBPENDING | LDLM_FL_BL_AST;
unlock_res_and_lock(lock);
LDLM_DEBUG(lock, "enqueue reply includes blocking AST");
}
/* If the lock has already been granted by a completion AST, don't
* clobber the LVB with an older one. */
- if (lvb_len) {
- /* We must lock or a racing completion might update lvb
- without letting us know and we'll clobber the correct value.
- Cannot unlock after the check either, a that still leaves
- a tiny window for completion to get in */
- lock_res_and_lock(lock);
- if (lock->l_req_mode != lock->l_granted_mode) {
-
- req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB,
- RCL_SERVER, lvb_len);
- tmplvb = req_capsule_server_get(&req->rq_pill,
- &RMF_DLM_LVB);
- if (tmplvb == NULL) {
- unlock_res_and_lock(lock);
- GOTO(cleanup, rc = -EPROTO);
- }
- memcpy(lock->l_lvb_data, tmplvb, lvb_len);
- }
- unlock_res_and_lock(lock);
+ if (lvb_len != 0) {
+ /* We must lock or a racing completion might update lvb without
+ * letting us know and we'll clobber the correct value.
+ * Cannot unlock after the check either, a that still leaves
+ * a tiny window for completion to get in */
+ lock_res_and_lock(lock);
+ if (lock->l_req_mode != lock->l_granted_mode)
+ rc = ldlm_fill_lvb(lock, &req->rq_pill, RCL_SERVER,
+ lock->l_lvb_data, size);
+ unlock_res_and_lock(lock);
+ if (rc < 0) {
+ cleanup_phase = 1;
+ GOTO(cleanup, rc);
+ }
}
if (!is_replay) {
}
EXPORT_SYMBOL(ldlm_cli_enqueue_fini);
-/* PAGE_SIZE-512 is to allow TCP/IP and LNET headers to fit into
- * a single page on the send/receive side. XXX: 512 should be changed
- * to more adequate value. */
+/**
+ * Estimate number of lock handles that would fit into request of given
+ * size. PAGE_SIZE-512 is to allow TCP/IP and LNET headers to fit into
+ * a single page on the send/receive side. XXX: 512 should be changed to
+ * more adequate value.
+ */
static inline int ldlm_req_handles_avail(int req_size, int off)
{
int avail;
- avail = min_t(int, LDLM_MAXREQSIZE, CFS_PAGE_SIZE - 512) - req_size;
+ avail = min_t(int, LDLM_MAXREQSIZE, PAGE_CACHE_SIZE - 512) - req_size;
if (likely(avail >= 0))
avail /= (int)sizeof(struct lustre_handle);
else
return ldlm_req_handles_avail(size, off);
}
-/* Cancel lru locks and pack them into the enqueue request. Pack there the given
- * @count locks in @cancels. */
+/**
+ * Cancel LRU locks and pack them into the enqueue request. Pack there the given
+ * \a count locks in \a cancels.
+ *
+ * This is to be called by functions preparing their own requests that
+ * might contain lists of locks to cancel in addition to actual operation
+ * that needs to be performed.
+ */
int ldlm_prep_elc_req(struct obd_export *exp, struct ptlrpc_request *req,
int version, int opc, int canceloff,
cfs_list_t *cancels, int count)
to_free = !ns_connect_lru_resize(ns) &&
opc == LDLM_ENQUEUE ? 1 : 0;
- /* Cancel lru locks here _only_ if the server supports
- * EARLY_CANCEL. Otherwise we have to send extra CANCEL
- * rpc, what will make us slower. */
+ /* Cancel LRU locks here _only_ if the server supports
+ * EARLY_CANCEL. Otherwise we have to send extra CANCEL
+ * RPC, which will make us slower. */
if (avail > count)
count += ldlm_cancel_lru_local(ns, cancels, to_free,
avail - count, 0, flags);
}
/* Pack into the request @pack lock handles. */
ldlm_cli_cancel_list(cancels, pack, req, 0);
- /* Prepare and send separate cancel rpc for others. */
+ /* Prepare and send separate cancel RPC for others. */
ldlm_cli_cancel_list(cancels, count - pack, NULL, 0);
} else {
ldlm_lock_list_put(cancels, l_bl_ast, count);
}
EXPORT_SYMBOL(ldlm_prep_enqueue_req);
-/* If a request has some specific initialisation it is passed in @reqp,
+struct ptlrpc_request *ldlm_enqueue_pack(struct obd_export *exp, int lvb_len)
+{
+ struct ptlrpc_request *req;
+ int rc;
+ ENTRY;
+
+ req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_LDLM_ENQUEUE);
+ if (req == NULL)
+ RETURN(ERR_PTR(-ENOMEM));
+
+ rc = ldlm_prep_enqueue_req(exp, req, NULL, 0);
+ if (rc) {
+ ptlrpc_request_free(req);
+ RETURN(ERR_PTR(rc));
+ }
+
+ req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER, lvb_len);
+ ptlrpc_request_set_replen(req);
+ RETURN(req);
+}
+EXPORT_SYMBOL(ldlm_enqueue_pack);
+
+/**
+ * Client-side lock enqueue.
+ *
+ * If a request has some specific initialisation it is passed in \a reqp,
* otherwise it is created in ldlm_cli_enqueue.
*
- * Supports sync and async requests, pass @async flag accordingly. If a
+ * Supports sync and async requests, pass \a async flag accordingly. If a
* request was created in ldlm_cli_enqueue and it is the async request,
- * pass it to the caller in @reqp. */
+ * pass it to the caller in \a reqp.
+ */
int ldlm_cli_enqueue(struct obd_export *exp, struct ptlrpc_request **reqp,
struct ldlm_enqueue_info *einfo,
const struct ldlm_res_id *res_id,
ldlm_policy_data_t const *policy, __u64 *flags,
- void *lvb, __u32 lvb_len, struct lustre_handle *lockh,
- int async)
+ void *lvb, __u32 lvb_len, enum lvb_type lvb_type,
+ struct lustre_handle *lockh, int async)
{
- struct ldlm_namespace *ns = exp->exp_obd->obd_namespace;
+ struct ldlm_namespace *ns;
struct ldlm_lock *lock;
struct ldlm_request *body;
int is_replay = *flags & LDLM_FL_REPLAY;
LASSERT(exp != NULL);
+ ns = exp->exp_obd->obd_namespace;
+
/* If we're replaying this lock, just check some invariants.
* If we're creating a new lock, get everything all setup nice. */
if (is_replay) {
LDLM_DEBUG(lock, "client-side enqueue START");
LASSERT(exp == lock->l_conn_export);
} else {
- const struct ldlm_callback_suite cbs = {
- .lcs_completion = einfo->ei_cb_cp,
- .lcs_blocking = einfo->ei_cb_bl,
- .lcs_glimpse = einfo->ei_cb_gl,
- .lcs_weigh = einfo->ei_cb_wg
- };
- lock = ldlm_lock_create(ns, res_id, einfo->ei_type,
- einfo->ei_mode, &cbs, einfo->ei_cbdata,
- lvb_len);
- if (lock == NULL)
- RETURN(-ENOMEM);
+ const struct ldlm_callback_suite cbs = {
+ .lcs_completion = einfo->ei_cb_cp,
+ .lcs_blocking = einfo->ei_cb_bl,
+ .lcs_glimpse = einfo->ei_cb_gl
+ };
+ lock = ldlm_lock_create(ns, res_id, einfo->ei_type,
+ einfo->ei_mode, &cbs, einfo->ei_cbdata,
+ lvb_len, lvb_type);
+ if (lock == NULL)
+ RETURN(-ENOMEM);
/* for the local lock, add the reference */
ldlm_lock_addref_internal(lock, einfo->ei_mode);
ldlm_lock2handle(lock, lockh);
* inodebits lock internally with both bits set.
*/
if (einfo->ei_type == LDLM_IBITS &&
- !(exp->exp_connect_flags & OBD_CONNECT_IBITS))
+ !(exp_connect_flags(exp) &
+ OBD_CONNECT_IBITS))
lock->l_policy_data.l_inodebits.bits =
MDS_INODELOCK_LOOKUP |
MDS_INODELOCK_UPDATE;
lock->l_policy_data = *policy;
}
- if (einfo->ei_type == LDLM_EXTENT)
- lock->l_req_extent = policy->l_extent;
- LDLM_DEBUG(lock, "client-side enqueue START");
+ if (einfo->ei_type == LDLM_EXTENT) {
+ /* extent lock without policy is a bug */
+ if (policy == NULL)
+ LBUG();
+
+ lock->l_req_extent = policy->l_extent;
+ }
+ LDLM_DEBUG(lock, "client-side enqueue START, flags %llx\n",
+ *flags);
}
lock->l_conn_export = exp;
lock->l_export = NULL;
lock->l_blocking_ast = einfo->ei_cb_bl;
- lock->l_flags |= (*flags & LDLM_FL_NO_LRU);
+ lock->l_flags |= (*flags & (LDLM_FL_NO_LRU | LDLM_FL_EXCL));
/* lock not sent to server yet */
/* Continue as normal. */
if (!req_passed_in) {
- if (lvb_len > 0) {
- req_capsule_extend(&req->rq_pill,
- &RQF_LDLM_ENQUEUE_LVB);
- req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB,
- RCL_SERVER, lvb_len);
- }
- ptlrpc_request_set_replen(req);
+ if (lvb_len > 0)
+ req_capsule_extend(&req->rq_pill,
+ &RQF_LDLM_ENQUEUE_LVB);
+ req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
+ lvb_len);
+ ptlrpc_request_set_replen(req);
}
/*
ldlm_reprocess_all(res);
rc = 0;
} else {
- rc = EDEADLOCK;
+ rc = LUSTRE_EDEADLK;
}
LDLM_DEBUG(lock, "client-side local convert handler END");
LDLM_LOCK_PUT(lock);
GOTO(out, rc);
}
} else {
- rc = EDEADLOCK;
+ rc = LUSTRE_EDEADLK;
}
EXIT;
out:
}
EXPORT_SYMBOL(ldlm_cli_convert);
-/* Cancel locks locally.
+/**
+ * Cancel locks locally.
* Returns:
- * LDLM_FL_LOCAL_ONLY if tere is no need in a CANCEL rpc to the server;
- * LDLM_FL_CANCELING otherwise;
- * LDLM_FL_BL_AST if there is a need in a separate CANCEL rpc. */
+ * \retval LDLM_FL_LOCAL_ONLY if there is no need for a CANCEL RPC to the server
+ * \retval LDLM_FL_CANCELING otherwise;
+ * \retval LDLM_FL_BL_AST if there is a need for a separate CANCEL RPC.
+ */
static __u64 ldlm_cli_cancel_local(struct ldlm_lock *lock)
{
__u64 rc = LDLM_FL_LOCAL_ONLY;
LDLM_DEBUG(lock, "client-side cancel");
/* Set this flag to prevent others from getting new references*/
lock_res_and_lock(lock);
- lock->l_flags |= LDLM_FL_CBPENDING;
+ ldlm_set_cbpending(lock);
local_only = !!(lock->l_flags &
(LDLM_FL_LOCAL_ONLY|LDLM_FL_CANCEL_ON_BLOCK));
- ldlm_cancel_callback(lock);
- rc = (lock->l_flags & LDLM_FL_BL_AST) ?
- LDLM_FL_BL_AST : LDLM_FL_CANCELING;
- unlock_res_and_lock(lock);
+ ldlm_cancel_callback(lock);
+ rc = (ldlm_is_bl_ast(lock)) ?
+ LDLM_FL_BL_AST : LDLM_FL_CANCELING;
+ unlock_res_and_lock(lock);
if (local_only) {
CDEBUG(D_DLMTRACE, "not sending request (at caller's "
RETURN(rc);
}
-/* Pack @count locks in @head into ldlm_request buffer at the offset @off,
- of the request @req. */
+/**
+ * Pack \a count locks in \a head into ldlm_request buffer of request \a req.
+ */
static void ldlm_cancel_pack(struct ptlrpc_request *req,
cfs_list_t *head, int count)
{
EXIT;
}
-/* Prepare and send a batched cancel rpc, it will include count lock handles
- * of locks given in @head. */
+/**
+ * Prepare and send a batched cancel RPC. It will include \a count lock
+ * handles of locks given in \a cancels list. */
int ldlm_cli_cancel_req(struct obd_export *exp, cfs_list_t *cancels,
int count, ldlm_cancel_flags_t flags)
{
} else {
rc = ptlrpc_queue_wait(req);
}
- if (rc == ESTALE) {
+ if (rc == LUSTRE_ESTALE) {
CDEBUG(D_DLMTRACE, "client/server (nid %s) "
"out of sync -- not fatal\n",
libcfs_nid2str(req->rq_import->
ptlrpc_req_finished(req);
continue;
} else if (rc != ELDLM_OK) {
- if (rc != -ESHUTDOWN)
- CERROR("Got rc %d from cancel RPC: canceling "
- "anyway\n", rc);
- break;
+ /* -ESHUTDOWN is common on umount */
+ CDEBUG_LIMIT(rc == -ESHUTDOWN ? D_DLMTRACE : D_ERROR,
+ "Got rc %d from cancel RPC: "
+ "canceling anyway\n", rc);
+ break;
}
sent = count;
break;
}
/**
- * Update client's obd pool related fields with new SLV and Limit from \a req.
+ * Update client's OBD pool related fields with new SLV and Limit from \a req.
*/
int ldlm_cli_update_pool(struct ptlrpc_request *req)
{
RETURN(0);
}
- /*
- * In some cases RPC may contain slv and limit zeroed out. This is
- * the case when server does not support lru resize feature. This is
- * also possible in some recovery cases when server side reqs have no
- * ref to obd export and thus access to server side namespace is no
- * possible.
- */
+ /* In some cases RPC may contain SLV and limit zeroed out. This
+ * is the case when server does not support LRU resize feature.
+ * This is also possible in some recovery cases when server-side
+ * reqs have no reference to the OBD export and thus access to
+ * server-side namespace is not possible. */
if (lustre_msg_get_slv(req->rq_repmsg) == 0 ||
lustre_msg_get_limit(req->rq_repmsg) == 0) {
DEBUG_REQ(D_HA, req, "Zero SLV or Limit found "
new_slv = lustre_msg_get_slv(req->rq_repmsg);
obd = req->rq_import->imp_obd;
- /*
- * Set new SLV and Limit to obd fields to make accessible for pool
- * thread. We do not access obd_namespace and pool directly here
- * as there is no reliable way to make sure that they are still
- * alive in cleanup time. Evil races are possible which may cause
- * oops in that time.
- */
- cfs_write_lock(&obd->obd_pool_lock);
+ /* Set new SLV and limit in OBD fields to make them accessible
+ * to the pool thread. We do not access obd_namespace and pool
+ * directly here as there is no reliable way to make sure that
+ * they are still alive at cleanup time. Evil races are possible
+ * which may cause Oops at that time. */
+ write_lock(&obd->obd_pool_lock);
obd->obd_pool_slv = new_slv;
obd->obd_pool_limit = new_limit;
- cfs_write_unlock(&obd->obd_pool_lock);
+ write_unlock(&obd->obd_pool_lock);
RETURN(0);
}
EXPORT_SYMBOL(ldlm_cli_update_pool);
-int ldlm_cli_cancel(struct lustre_handle *lockh)
+/**
+ * Client side lock cancel.
+ *
+ * Lock must not have any readers or writers by this time.
+ */
+int ldlm_cli_cancel(struct lustre_handle *lockh,
+ ldlm_cancel_flags_t cancel_flags)
{
struct obd_export *exp;
int avail, flags, count = 1;
}
rc = ldlm_cli_cancel_local(lock);
- if (rc == LDLM_FL_LOCAL_ONLY) {
- LDLM_LOCK_RELEASE(lock);
+ if (rc == LDLM_FL_LOCAL_ONLY || cancel_flags & LCF_LOCAL) {
+ LDLM_LOCK_RELEASE(lock);
RETURN(0);
- }
- /* Even if the lock is marked as LDLM_FL_BL_AST, this is a LDLM_CANCEL
- * rpc which goes to canceld portal, so we can cancel other lru locks
- * here and send them all as one LDLM_CANCEL rpc. */
+ }
+ /* Even if the lock is marked as LDLM_FL_BL_AST, this is a LDLM_CANCEL
+ * RPC which goes to canceld portal, so we can cancel other LRU locks
+ * here and send them all as one LDLM_CANCEL RPC. */
LASSERT(cfs_list_empty(&lock->l_bl_ast));
cfs_list_add(&lock->l_bl_ast, &cancels);
count += ldlm_cancel_lru_local(ns, &cancels, 0, avail - 1,
LCF_BL_AST, flags);
}
- ldlm_cli_cancel_list(&cancels, count, NULL, 0);
+ ldlm_cli_cancel_list(&cancels, count, NULL, cancel_flags);
RETURN(0);
}
EXPORT_SYMBOL(ldlm_cli_cancel);
-/* XXX until we will have compound requests and can cut cancels from generic rpc
- * we need send cancels with LDLM_FL_BL_AST flag as separate rpc */
+/**
+ * Locally cancel up to \a count locks in list \a cancels.
+ * Return the number of cancelled locks.
+ */
int ldlm_cli_cancel_list_local(cfs_list_t *cancels, int count,
ldlm_cancel_flags_t flags)
{
} else {
rc = ldlm_cli_cancel_local(lock);
}
- if (!(flags & LCF_BL_AST) && (rc == LDLM_FL_BL_AST)) {
- LDLM_DEBUG(lock, "Cancel lock separately");
- cfs_list_del_init(&lock->l_bl_ast);
- cfs_list_add(&lock->l_bl_ast, &head);
- bl_ast ++;
+ /* Until we have compound requests and can send LDLM_CANCEL
+ * requests batched with generic RPCs, we need to send cancels
+ * with the LDLM_FL_BL_AST flag in a separate RPC from
+ * the one being generated now. */
+ if (!(flags & LCF_BL_AST) && (rc == LDLM_FL_BL_AST)) {
+ LDLM_DEBUG(lock, "Cancel lock separately");
+ cfs_list_del_init(&lock->l_bl_ast);
+ cfs_list_add(&lock->l_bl_ast, &head);
+ bl_ast++;
continue;
}
if (rc == LDLM_FL_LOCAL_ONLY) {
LDLM_LOCK_RELEASE(lock);
count--;
}
-
}
if (bl_ast > 0) {
count -= bl_ast;
EXPORT_SYMBOL(ldlm_cli_cancel_list_local);
/**
- * Cancel as many locks as possible w/o sending any rpcs (e.g. to write back
- * dirty data, to close a file, ...) or waiting for any rpcs in-flight (e.g.
+ * Cancel as many locks as possible w/o sending any RPCs (e.g. to write back
+ * dirty data, to close a file, ...) or waiting for any RPCs in-flight (e.g.
* readahead requests, ...)
*/
static ldlm_policy_res_t ldlm_cancel_no_wait_policy(struct ldlm_namespace *ns,
int unused, int added,
int count)
{
- ldlm_policy_res_t result = LDLM_POLICY_CANCEL_LOCK;
- ldlm_cancel_for_recovery cb = ns->ns_cancel_for_recovery;
- lock_res_and_lock(lock);
-
- /* don't check added & count since we want to process all locks
- * from unused list */
- switch (lock->l_resource->lr_type) {
- case LDLM_EXTENT:
- case LDLM_IBITS:
- if (cb && cb(lock))
- break;
- default:
- result = LDLM_POLICY_SKIP_LOCK;
- lock->l_flags |= LDLM_FL_SKIPPED;
- break;
- }
-
- unlock_res_and_lock(lock);
- RETURN(result);
+ ldlm_policy_res_t result = LDLM_POLICY_CANCEL_LOCK;
+ ldlm_cancel_for_recovery cb = ns->ns_cancel_for_recovery;
+
+ /* don't check added & count since we want to process all locks
+ * from unused list.
+ * It's fine to not take lock to access lock->l_resource since
+ * the lock has already been granted so it won't change. */
+ switch (lock->l_resource->lr_type) {
+ case LDLM_EXTENT:
+ case LDLM_IBITS:
+ if (cb && cb(lock))
+ break;
+ default:
+ result = LDLM_POLICY_SKIP_LOCK;
+ lock_res_and_lock(lock);
+ ldlm_set_skipped(lock);
+ unlock_res_and_lock(lock);
+ break;
+ }
+
+ RETURN(result);
}
/**
- * Callback function for lru-resize policy. Makes decision whether to keep
- * \a lock in LRU for current \a LRU size \a unused, added in current scan
- * \a added and number of locks to be preferably canceled \a count.
+ * Callback function for LRU-resize policy. Decides whether to keep
+ * \a lock in LRU for current \a LRU size \a unused, added in current
+ * scan \a added and number of locks to be preferably canceled \a count.
*
* \retval LDLM_POLICY_KEEP_LOCK keep lock in LRU in stop scanning
*
__u64 slv, lvf, lv;
cfs_time_t la;
- /*
- * Stop lru processing when we reached passed @count or checked all
- * locks in lru.
- */
+ /* Stop LRU processing when we reach past @count or have checked all
+ * locks in LRU. */
if (count && added >= count)
return LDLM_POLICY_KEEP_LOCK;
lvf = ldlm_pool_get_lvf(pl);
la = cfs_duration_sec(cfs_time_sub(cur,
lock->l_last_used));
+ lv = lvf * la * unused;
- /*
- * Stop when slv is not yet come from server or lv is smaller than
- * it is.
- */
- lv = lvf * la * unused;
+ /* Inform pool about current CLV to see it via proc. */
+ ldlm_pool_set_clv(pl, lv);
- /*
- * Inform pool about current CLV to see it via proc.
- */
- ldlm_pool_set_clv(pl, lv);
- return (slv == 0 || lv < slv) ?
- LDLM_POLICY_KEEP_LOCK : LDLM_POLICY_CANCEL_LOCK;
+ /* Stop when SLV is not yet come from server or lv is smaller than
+ * it is. */
+ return (slv == 0 || lv < slv) ?
+ LDLM_POLICY_KEEP_LOCK : LDLM_POLICY_CANCEL_LOCK;
}
/**
* Callback function for proc used policy. Makes decision whether to keep
- * \a lock in LRU for current \a LRU size \a unused, added in current scan
- * \a added and number of locks to be preferably canceled \a count.
+ * \a lock in LRU for current \a LRU size \a unused, added in current scan \a
+ * added and number of locks to be preferably canceled \a count.
*
* \retval LDLM_POLICY_KEEP_LOCK keep lock in LRU in stop scanning
*
int unused, int added,
int count)
{
- /*
- * Stop lru processing when we reached passed @count or checked all
- * locks in lru.
- */
- return (added >= count) ?
- LDLM_POLICY_KEEP_LOCK : LDLM_POLICY_CANCEL_LOCK;
+ /* Stop LRU processing when we reach past @count or have checked all
+ * locks in LRU. */
+ return (added >= count) ?
+ LDLM_POLICY_KEEP_LOCK : LDLM_POLICY_CANCEL_LOCK;
}
/**
- * Callback function for aged policy. Makes decision whether to keep
- * \a lock in LRU for current \a LRU size \a unused, added in current scan
- * \a added and number of locks to be preferably canceled \a count.
+ * Callback function for aged policy. Makes decision whether to keep \a lock in
+ * LRU for current LRU size \a unused, added in current scan \a added and
+ * number of locks to be preferably canceled \a count.
*
* \retval LDLM_POLICY_KEEP_LOCK keep lock in LRU in stop scanning
*
* \retval LDLM_POLICY_CANCEL_LOCK cancel lock from LRU
*/
static ldlm_policy_res_t ldlm_cancel_aged_policy(struct ldlm_namespace *ns,
- struct ldlm_lock *lock,
- int unused, int added,
- int count)
+ struct ldlm_lock *lock,
+ int unused, int added,
+ int count)
{
- /*
- * Stop lru processing if young lock is found and we reached passed
- * @count.
- */
+ /* Stop LRU processing if young lock is found and we reach past count */
return ((added >= count) &&
cfs_time_before(cfs_time_current(),
cfs_time_add(lock->l_last_used,
}
/**
- * Callback function for default policy. Makes decision whether to keep
- * \a lock in LRU for current \a LRU size \a unused, added in current scan
- * \a added and number of locks to be preferably canceled \a count.
+ * Callback function for default policy. Makes decision whether to keep \a lock
+ * in LRU for current LRU size \a unused, added in current scan \a added and
+ * number of locks to be preferably canceled \a count.
*
* \retval LDLM_POLICY_KEEP_LOCK keep lock in LRU in stop scanning
*
* \retval LDLM_POLICY_CANCEL_LOCK cancel lock from LRU
*/
static ldlm_policy_res_t ldlm_cancel_default_policy(struct ldlm_namespace *ns,
- struct ldlm_lock *lock,
- int unused, int added,
- int count)
+ struct ldlm_lock *lock,
+ int unused, int added,
+ int count)
{
- /*
- * Stop lru processing when we reached passed @count or checked all
- * locks in lru.
- */
+ /* Stop LRU processing when we reach past count or have checked all
+ * locks in LRU. */
return (added >= count) ?
LDLM_POLICY_KEEP_LOCK : LDLM_POLICY_CANCEL_LOCK;
}
return ldlm_cancel_default_policy;
}
-/* - Free space in lru for @count new locks,
+/**
+ * - Free space in LRU for \a count new locks,
* redundant unused locks are canceled locally;
* - also cancel locally unused aged locks;
- * - do not cancel more than @max locks;
- * - GET the found locks and add them into the @cancels list.
+ * - do not cancel more than \a max locks;
+ * - GET the found locks and add them into the \a cancels list.
*
* A client lock can be added to the l_bl_ast list only when it is
- * marked LDLM_FL_CANCELING. Otherwise, somebody is already doing CANCEL.
- * There are the following use cases: ldlm_cancel_resource_local(),
- * ldlm_cancel_lru_local() and ldlm_cli_cancel(), which check&set this
- * flag properly. As any attempt to cancel a lock rely on this flag,
- * l_bl_ast list is accessed later without any special locking.
+ * marked LDLM_FL_CANCELING. Otherwise, somebody is already doing
+ * CANCEL. There are the following use cases:
+ * ldlm_cancel_resource_local(), ldlm_cancel_lru_local() and
+ * ldlm_cli_cancel(), which check and set this flag properly. As any
+ * attempt to cancel a lock rely on this flag, l_bl_ast list is accessed
+ * later without any special locking.
*
- * Calling policies for enabled lru resize:
+ * Calling policies for enabled LRU resize:
* ----------------------------------------
- * flags & LDLM_CANCEL_LRUR - use lru resize policy (SLV from server) to
- * cancel not more than @count locks;
+ * flags & LDLM_CANCEL_LRUR - use LRU resize policy (SLV from server) to
+ * cancel not more than \a count locks;
*
- * flags & LDLM_CANCEL_PASSED - cancel @count number of old locks (located at
- * the beginning of lru list);
+ * flags & LDLM_CANCEL_PASSED - cancel \a count number of old locks (located at
+ * the beginning of LRU list);
*
- * flags & LDLM_CANCEL_SHRINK - cancel not more than @count locks according to
+ * flags & LDLM_CANCEL_SHRINK - cancel not more than \a count locks according to
* memory pressre policy function;
*
- * flags & LDLM_CANCEL_AGED - cancel alocks according to "aged policy".
+ * flags & LDLM_CANCEL_AGED - cancel \a count locks according to "aged policy".
*
* flags & LDLM_CANCEL_NO_WAIT - cancel as many unused locks as possible
* (typically before replaying locks) w/o
- * sending any rpcs or waiting for any
- * outstanding rpc to complete.
+ * sending any RPCs or waiting for any
+ * outstanding RPC to complete.
*/
static int ldlm_prepare_lru_list(struct ldlm_namespace *ns, cfs_list_t *cancels,
int count, int max, int flags)
{
- ldlm_cancel_lru_policy_t pf;
- struct ldlm_lock *lock, *next;
- int added = 0, unused, remained;
- ENTRY;
+ ldlm_cancel_lru_policy_t pf;
+ struct ldlm_lock *lock, *next;
+ int added = 0, unused, remained;
+ ENTRY;
- cfs_spin_lock(&ns->ns_lock);
+ spin_lock(&ns->ns_lock);
unused = ns->ns_nr_unused;
remained = unused;
break;
cfs_list_for_each_entry_safe(lock, next, &ns->ns_unused_list,
- l_lru){
+ l_lru) {
/* No locks which got blocking requests. */
- LASSERT(!(lock->l_flags & LDLM_FL_BL_AST));
+ LASSERT(!ldlm_is_bl_ast(lock));
- if (flags & LDLM_CANCEL_NO_WAIT &&
- lock->l_flags & LDLM_FL_SKIPPED)
- /* already processed */
- continue;
+ if (flags & LDLM_CANCEL_NO_WAIT &&
+ ldlm_is_skipped(lock))
+ /* already processed */
+ continue;
- /* Somebody is already doing CANCEL. No need in this
- * lock in lru, do not traverse it again. */
- if (!(lock->l_flags & LDLM_FL_CANCELING))
+ /* Somebody is already doing CANCEL. No need for this
+ * lock in LRU, do not traverse it again. */
+ if (!ldlm_is_canceling(lock))
break;
- ldlm_lock_remove_from_lru_nolock(lock);
- }
- if (&lock->l_lru == &ns->ns_unused_list)
- break;
-
- LDLM_LOCK_GET(lock);
- cfs_spin_unlock(&ns->ns_lock);
- lu_ref_add(&lock->l_reference, __FUNCTION__, cfs_current());
-
- /* Pass the lock through the policy filter and see if it
- * should stay in lru.
- *
- * Even for shrinker policy we stop scanning if
- * we find a lock that should stay in the cache.
- * We should take into account lock age anyway
- * as new lock even if it is small of weight is
- * valuable resource.
- *
- * That is, for shrinker policy we drop only
- * old locks, but additionally chose them by
- * their weight. Big extent locks will stay in
- * the cache. */
- result = pf(ns, lock, unused, added, count);
- if (result == LDLM_POLICY_KEEP_LOCK) {
- lu_ref_del(&lock->l_reference,
- __FUNCTION__, cfs_current());
- LDLM_LOCK_RELEASE(lock);
- cfs_spin_lock(&ns->ns_lock);
- break;
- }
- if (result == LDLM_POLICY_SKIP_LOCK) {
- lu_ref_del(&lock->l_reference,
- __FUNCTION__, cfs_current());
- LDLM_LOCK_RELEASE(lock);
- cfs_spin_lock(&ns->ns_lock);
- continue;
- }
-
- lock_res_and_lock(lock);
- /* Check flags again under the lock. */
- if ((lock->l_flags & LDLM_FL_CANCELING) ||
- (ldlm_lock_remove_from_lru(lock) == 0)) {
- /* other thread is removing lock from lru or
- * somebody is already doing CANCEL or
- * there is a blocking request which will send
- * cancel by itseft or the lock is matched
- * is already not unused. */
- unlock_res_and_lock(lock);
- lu_ref_del(&lock->l_reference,
- __FUNCTION__, cfs_current());
- LDLM_LOCK_RELEASE(lock);
- cfs_spin_lock(&ns->ns_lock);
- continue;
- }
- LASSERT(!lock->l_readers && !lock->l_writers);
-
- /* If we have chosen to cancel this lock voluntarily, we
- * better send cancel notification to server, so that it
- * frees appropriate state. This might lead to a race
- * where while we are doing cancel here, server is also
- * silently cancelling this lock. */
- lock->l_flags &= ~LDLM_FL_CANCEL_ON_BLOCK;
-
- /* Setting the CBPENDING flag is a little misleading,
- * but prevents an important race; namely, once
- * CBPENDING is set, the lock can accumulate no more
- * readers/writers. Since readers and writers are
- * already zero here, ldlm_lock_decref() won't see
- * this flag and call l_blocking_ast */
- lock->l_flags |= LDLM_FL_CBPENDING | LDLM_FL_CANCELING;
-
- /* We can't re-add to l_lru as it confuses the
- * refcounting in ldlm_lock_remove_from_lru() if an AST
- * arrives after we drop lr_lock below. We use l_bl_ast
- * and can't use l_pending_chain as it is used both on
- * server and client nevertheless bug 5666 says it is
- * used only on server */
- LASSERT(cfs_list_empty(&lock->l_bl_ast));
- cfs_list_add(&lock->l_bl_ast, cancels);
- unlock_res_and_lock(lock);
- lu_ref_del(&lock->l_reference, __FUNCTION__, cfs_current());
- cfs_spin_lock(&ns->ns_lock);
- added++;
- unused--;
- }
- cfs_spin_unlock(&ns->ns_lock);
- RETURN(added);
+ ldlm_lock_remove_from_lru_nolock(lock);
+ }
+ if (&lock->l_lru == &ns->ns_unused_list)
+ break;
+
+ LDLM_LOCK_GET(lock);
+ spin_unlock(&ns->ns_lock);
+ lu_ref_add(&lock->l_reference, __FUNCTION__, current);
+
+ /* Pass the lock through the policy filter and see if it
+ * should stay in LRU.
+ *
+ * Even for shrinker policy we stop scanning if
+ * we find a lock that should stay in the cache.
+ * We should take into account lock age anyway
+ * as a new lock is a valuable resource even if
+ * it has a low weight.
+ *
+ * That is, for shrinker policy we drop only
+ * old locks, but additionally choose them by
+ * their weight. Big extent locks will stay in
+ * the cache. */
+ result = pf(ns, lock, unused, added, count);
+ if (result == LDLM_POLICY_KEEP_LOCK) {
+ lu_ref_del(&lock->l_reference,
+ __FUNCTION__, current);
+ LDLM_LOCK_RELEASE(lock);
+ spin_lock(&ns->ns_lock);
+ break;
+ }
+ if (result == LDLM_POLICY_SKIP_LOCK) {
+ lu_ref_del(&lock->l_reference,
+ __func__, current);
+ LDLM_LOCK_RELEASE(lock);
+ spin_lock(&ns->ns_lock);
+ continue;
+ }
+
+ lock_res_and_lock(lock);
+ /* Check flags again under the lock. */
+ if (ldlm_is_canceling(lock) ||
+ (ldlm_lock_remove_from_lru(lock) == 0)) {
+ /* Another thread is removing lock from LRU, or
+ * somebody is already doing CANCEL, or there
+ * is a blocking request which will send cancel
+ * by itself, or the lock is no longer unused. */
+ unlock_res_and_lock(lock);
+ lu_ref_del(&lock->l_reference, __FUNCTION__, current);
+ LDLM_LOCK_RELEASE(lock);
+ spin_lock(&ns->ns_lock);
+ continue;
+ }
+ LASSERT(!lock->l_readers && !lock->l_writers);
+
+ /* If we have chosen to cancel this lock voluntarily, we
+ * better send cancel notification to server, so that it
+ * frees appropriate state. This might lead to a race
+ * where while we are doing cancel here, server is also
+ * silently cancelling this lock. */
+ ldlm_clear_cancel_on_block(lock);
+
+ /* Setting the CBPENDING flag is a little misleading,
+ * but prevents an important race; namely, once
+ * CBPENDING is set, the lock can accumulate no more
+ * readers/writers. Since readers and writers are
+ * already zero here, ldlm_lock_decref() won't see
+ * this flag and call l_blocking_ast */
+ lock->l_flags |= LDLM_FL_CBPENDING | LDLM_FL_CANCELING;
+
+ /* We can't re-add to l_lru as it confuses the
+ * refcounting in ldlm_lock_remove_from_lru() if an AST
+ * arrives after we drop lr_lock below. We use l_bl_ast
+ * and can't use l_pending_chain as it is used both on
+ * server and client nevertheless bug 5666 says it is
+ * used only on server */
+ LASSERT(cfs_list_empty(&lock->l_bl_ast));
+ cfs_list_add(&lock->l_bl_ast, cancels);
+ unlock_res_and_lock(lock);
+ lu_ref_del(&lock->l_reference, __FUNCTION__, current);
+ spin_lock(&ns->ns_lock);
+ added++;
+ unused--;
+ }
+ spin_unlock(&ns->ns_lock);
+ RETURN(added);
}
int ldlm_cancel_lru_local(struct ldlm_namespace *ns, cfs_list_t *cancels,
return ldlm_cli_cancel_list_local(cancels, added, cancel_flags);
}
-/* when called with LDLM_ASYNC the blocking callback will be handled
+/**
+ * Cancel at least \a nr locks from given namespace LRU.
+ *
+ * When called with LCF_ASYNC the blocking callback will be handled
* in a thread and this function will return after the thread has been
- * asked to call the callback. when called with LDLM_SYNC the blocking
- * callback will be performed in this function. */
-int ldlm_cancel_lru(struct ldlm_namespace *ns, int nr, ldlm_sync_t mode,
- int flags)
+ * asked to call the callback. When called with LCF_ASYNC the blocking
+ * callback will be performed in this function.
+ */
+int ldlm_cancel_lru(struct ldlm_namespace *ns, int nr,
+ ldlm_cancel_flags_t cancel_flags,
+ int flags)
{
- CFS_LIST_HEAD(cancels);
- int count, rc;
- ENTRY;
+ CFS_LIST_HEAD(cancels);
+ int count, rc;
+ ENTRY;
#ifndef __KERNEL__
- mode = LDLM_SYNC; /* force to be sync in user space */
+ cancel_flags &= ~LCF_ASYNC; /* force to be sync in user space */
#endif
- /* Just prepare the list of locks, do not actually cancel them yet.
- * Locks are cancelled later in a separate thread. */
- count = ldlm_prepare_lru_list(ns, &cancels, nr, 0, flags);
- rc = ldlm_bl_to_thread_list(ns, NULL, &cancels, count, mode);
- if (rc == 0)
- RETURN(count);
-
- RETURN(0);
+ /* Just prepare the list of locks, do not actually cancel them yet.
+ * Locks are cancelled later in a separate thread. */
+ count = ldlm_prepare_lru_list(ns, &cancels, nr, 0, flags);
+ rc = ldlm_bl_to_thread_list(ns, NULL, &cancels, count, cancel_flags);
+ if (rc == 0)
+ RETURN(count);
+
+ RETURN(0);
}
-/* Find and cancel locally unused locks found on resource, matched to the
- * given policy, mode. GET the found locks and add them into the @cancels
- * list. */
+/**
+ * Find and cancel locally unused locks found on resource, matched to the
+ * given policy, mode. GET the found locks and add them into the \a cancels
+ * list.
+ */
int ldlm_cancel_resource_local(struct ldlm_resource *res,
- cfs_list_t *cancels,
- ldlm_policy_data_t *policy,
- ldlm_mode_t mode, int lock_flags,
- ldlm_cancel_flags_t cancel_flags, void *opaque)
+ cfs_list_t *cancels,
+ ldlm_policy_data_t *policy,
+ ldlm_mode_t mode, __u64 lock_flags,
+ ldlm_cancel_flags_t cancel_flags, void *opaque)
{
struct ldlm_lock *lock;
int count = 0;
if (lock->l_readers || lock->l_writers)
continue;
- /* If somebody is already doing CANCEL, or blocking ast came,
- * skip this lock. */
- if (lock->l_flags & LDLM_FL_BL_AST ||
- lock->l_flags & LDLM_FL_CANCELING)
- continue;
+ /* If somebody is already doing CANCEL, or blocking AST came,
+ * skip this lock. */
+ if (ldlm_is_bl_ast(lock) || ldlm_is_canceling(lock))
+ continue;
if (lockmode_compat(lock->l_granted_mode, mode))
continue;
policy->l_inodebits.bits))
continue;
- /* See CBPENDING comment in ldlm_cancel_lru */
- lock->l_flags |= LDLM_FL_CBPENDING | LDLM_FL_CANCELING |
- lock_flags;
+ /* See CBPENDING comment in ldlm_cancel_lru */
+ lock->l_flags |= LDLM_FL_CBPENDING | LDLM_FL_CANCELING |
+ lock_flags;
LASSERT(cfs_list_empty(&lock->l_bl_ast));
cfs_list_add(&lock->l_bl_ast, cancels);
}
EXPORT_SYMBOL(ldlm_cancel_resource_local);
-/* If @req is NULL, send CANCEL request to server with handles of locks
- * in the @cancels. If EARLY_CANCEL is not supported, send CANCEL requests
+/**
+ * Cancel client-side locks from a list and send/prepare cancel RPCs to the
+ * server.
+ * If \a req is NULL, send CANCEL request to server with handles of locks
+ * in the \a cancels. If EARLY_CANCEL is not supported, send CANCEL requests
* separately per lock.
- * If @req is not NULL, put handles of locks in @cancels into the request
- * buffer at the offset @off.
- * Destroy @cancels at the end. */
+ * If \a req is not NULL, put handles of locks in \a cancels into the request
+ * buffer at the offset \a off.
+ * Destroy \a cancels at the end.
+ */
int ldlm_cli_cancel_list(cfs_list_t *cancels, int count,
struct ptlrpc_request *req, ldlm_cancel_flags_t flags)
{
/* XXX: requests (both batched and not) could be sent in parallel.
* Usually it is enough to have just 1 RPC, but it is possible that
- * there are to many locks to be cancelled in LRU or on a resource.
+ * there are too many locks to be cancelled in LRU or on a resource.
* It would also speed up the case when the server does not support
* the feature. */
while (count > 0) {
cancels, 1, flags);
}
- if (res < 0) {
- if (res != -ESHUTDOWN)
- CERROR("ldlm_cli_cancel_list: %d\n", res);
- res = count;
- }
+ if (res < 0) {
+ CDEBUG_LIMIT(res == -ESHUTDOWN ? D_DLMTRACE : D_ERROR,
+ "ldlm_cli_cancel_list: %d\n", res);
+ res = count;
+ }
count -= res;
ldlm_lock_list_put(cancels, l_bl_ast, res);
}
EXPORT_SYMBOL(ldlm_cli_cancel_list);
+/**
+ * Cancel all locks on a resource that have 0 readers/writers.
+ *
+ * If flags & LDLM_FL_LOCAL_ONLY, throw the locks away without trying
+ * to notify the server. */
int ldlm_cli_cancel_unused_resource(struct ldlm_namespace *ns,
const struct ldlm_res_id *res_id,
ldlm_policy_data_t *policy,
0, flags | LCF_BL_AST, opaque);
rc = ldlm_cli_cancel_list(&cancels, count, NULL, flags);
if (rc != ELDLM_OK)
- CERROR("ldlm_cli_cancel_unused_resource: %d\n", rc);
+ CERROR("canceling unused lock "DLDLMRES": rc = %d\n",
+ PLDLMRES(res), rc);
LDLM_RESOURCE_DELREF(res);
ldlm_resource_putref(res);
};
static int ldlm_cli_hash_cancel_unused(cfs_hash_t *hs, cfs_hash_bd_t *bd,
- cfs_hlist_node_t *hnode, void *arg)
+ cfs_hlist_node_t *hnode, void *arg)
{
- struct ldlm_resource *res = cfs_hash_object(hs, hnode);
- struct ldlm_cli_cancel_arg *lc = arg;
- int rc;
-
- rc = ldlm_cli_cancel_unused_resource(ldlm_res_to_ns(res), &res->lr_name,
- NULL, LCK_MINMODE,
- lc->lc_flags, lc->lc_opaque);
- if (rc != 0) {
- CERROR("ldlm_cli_cancel_unused ("LPU64"): %d\n",
- res->lr_name.name[0], rc);
- }
- /* must return 0 for hash iteration */
- return 0;
+ struct ldlm_resource *res = cfs_hash_object(hs, hnode);
+ struct ldlm_cli_cancel_arg *lc = arg;
+
+ ldlm_cli_cancel_unused_resource(ldlm_res_to_ns(res), &res->lr_name,
+ NULL, LCK_MINMODE, lc->lc_flags,
+ lc->lc_opaque);
+ /* must return 0 for hash iteration */
+ return 0;
}
-/* Cancel all locks on a namespace (or a specific resource, if given)
+/**
+ * Cancel all locks on a namespace (or a specific resource, if given)
* that have 0 readers/writers.
*
* If flags & LCF_LOCAL, throw the locks away without trying
}
static int replay_lock_interpret(const struct lu_env *env,
- struct ptlrpc_request *req,
- struct ldlm_async_args *aa, int rc)
+ struct ptlrpc_request *req,
+ struct ldlm_async_args *aa, int rc)
{
- struct ldlm_lock *lock;
- struct ldlm_reply *reply;
- struct obd_export *exp;
-
- ENTRY;
- cfs_atomic_dec(&req->rq_import->imp_replay_inflight);
- if (rc != ELDLM_OK)
- GOTO(out, rc);
+ struct ldlm_lock *lock;
+ struct ldlm_reply *reply;
+ struct obd_export *exp;
+ ENTRY;
+ atomic_dec(&req->rq_import->imp_replay_inflight);
+ if (rc != ELDLM_OK)
+ GOTO(out, rc);
reply = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
if (reply == NULL)
/* Bug 11974: Do not replay a lock which is actively being canceled */
- if (lock->l_flags & LDLM_FL_CANCELING) {
+ if (ldlm_is_canceling(lock)) {
LDLM_DEBUG(lock, "Not replaying canceled lock:");
RETURN(0);
}
/* If this is reply-less callback lock, we cannot replay it, since
* server might have long dropped it, but notification of that event was
* lost by network. (and server granted conflicting lock already) */
- if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK) {
+ if (ldlm_is_cancel_on_block(lock)) {
LDLM_DEBUG(lock, "Not replaying reply-less lock:");
ldlm_lock_cancel(lock);
RETURN(0);
}
+
/*
* If granted mode matches the requested mode, this lock is granted.
*
body->lock_flags = ldlm_flags_to_wire(flags);
ldlm_lock2handle(lock, &body->lock_handle[0]);
- if (lock->l_lvb_len != 0) {
- req_capsule_extend(&req->rq_pill, &RQF_LDLM_ENQUEUE_LVB);
- req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
- lock->l_lvb_len);
- }
+ if (lock->l_lvb_len > 0)
+ req_capsule_extend(&req->rq_pill, &RQF_LDLM_ENQUEUE_LVB);
+ req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
+ lock->l_lvb_len);
ptlrpc_request_set_replen(req);
/* notify the server we've replayed all requests.
* also, we mark the request to be put on a dedicated
* queue to be processed after all request replayes.
* bug 6063 */
- lustre_msg_set_flags(req->rq_reqmsg, MSG_REQ_REPLAY_DONE);
+ lustre_msg_set_flags(req->rq_reqmsg, MSG_REQ_REPLAY_DONE);
- LDLM_DEBUG(lock, "replaying lock:");
+ LDLM_DEBUG(lock, "replaying lock:");
- cfs_atomic_inc(&req->rq_import->imp_replay_inflight);
- CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
- aa = ptlrpc_req_async_args(req);
- aa->lock_handle = body->lock_handle[0];
- req->rq_interpret_reply = (ptlrpc_interpterer_t)replay_lock_interpret;
- ptlrpcd_add_req(req, PDL_POLICY_LOCAL, -1);
+ atomic_inc(&req->rq_import->imp_replay_inflight);
+ CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
+ aa = ptlrpc_req_async_args(req);
+ aa->lock_handle = body->lock_handle[0];
+ req->rq_interpret_reply = (ptlrpc_interpterer_t)replay_lock_interpret;
+ ptlrpcd_add_req(req, PDL_POLICY_LOCAL, -1);
- RETURN(0);
+ RETURN(0);
}
/**
int ldlm_replay_locks(struct obd_import *imp)
{
- struct ldlm_namespace *ns = imp->imp_obd->obd_namespace;
- CFS_LIST_HEAD(list);
- struct ldlm_lock *lock, *next;
- int rc = 0;
+ struct ldlm_namespace *ns = imp->imp_obd->obd_namespace;
+ CFS_LIST_HEAD(list);
+ struct ldlm_lock *lock, *next;
+ int rc = 0;
- ENTRY;
+ ENTRY;
- LASSERT(cfs_atomic_read(&imp->imp_replay_inflight) == 0);
+ LASSERT(atomic_read(&imp->imp_replay_inflight) == 0);
- /* don't replay locks if import failed recovery */
- if (imp->imp_vbr_failed)
- RETURN(0);
+ /* don't replay locks if import failed recovery */
+ if (imp->imp_vbr_failed)
+ RETURN(0);
- /* ensure this doesn't fall to 0 before all have been queued */
- cfs_atomic_inc(&imp->imp_replay_inflight);
+ /* ensure this doesn't fall to 0 before all have been queued */
+ atomic_inc(&imp->imp_replay_inflight);
- if (ldlm_cancel_unused_locks_before_replay)
- ldlm_cancel_unused_locks_for_replay(ns);
+ if (ldlm_cancel_unused_locks_before_replay)
+ ldlm_cancel_unused_locks_for_replay(ns);
- ldlm_namespace_foreach(ns, ldlm_chain_lock_for_replay, &list);
+ ldlm_namespace_foreach(ns, ldlm_chain_lock_for_replay, &list);
- cfs_list_for_each_entry_safe(lock, next, &list, l_pending_chain) {
- cfs_list_del_init(&lock->l_pending_chain);
- if (rc) {
- LDLM_LOCK_RELEASE(lock);
- continue; /* or try to do the rest? */
- }
- rc = replay_one_lock(imp, lock);
- LDLM_LOCK_RELEASE(lock);
- }
+ cfs_list_for_each_entry_safe(lock, next, &list, l_pending_chain) {
+ cfs_list_del_init(&lock->l_pending_chain);
+ if (rc) {
+ LDLM_LOCK_RELEASE(lock);
+ continue; /* or try to do the rest? */
+ }
+ rc = replay_one_lock(imp, lock);
+ LDLM_LOCK_RELEASE(lock);
+ }
- cfs_atomic_dec(&imp->imp_replay_inflight);
+ atomic_dec(&imp->imp_replay_inflight);
- RETURN(rc);
+ RETURN(rc);
}
EXPORT_SYMBOL(ldlm_replay_locks);
git://git.whamcloud.com / fs / lustre-release.git / blobdiff