| /* |
| * GPL HEADER START |
| * |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 only, |
| * as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License version 2 for more details (a copy is included |
| * in the LICENSE file that accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License |
| * version 2 along with this program; If not, see |
| * http://www.gnu.org/licenses/gpl-2.0.html |
| * |
| * GPL HEADER END |
| */ |
| /* |
| * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved. |
| * Use is subject to license terms. |
| * |
| * Copyright (c) 2010, 2015, 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 |
| |
| #include "../include/lustre_dlm.h" |
| #include "../include/obd_class.h" |
| #include "../include/obd.h" |
| |
| #include "ldlm_internal.h" |
| |
| unsigned int ldlm_enqueue_min = OBD_TIMEOUT_DEFAULT; |
| module_param(ldlm_enqueue_min, uint, 0644); |
| MODULE_PARM_DESC(ldlm_enqueue_min, "lock enqueue timeout minimum"); |
| |
| /* in client side, whether the cached locks will be canceled before replay */ |
| unsigned int ldlm_cancel_unused_locks_before_replay = 1; |
| |
| static void interrupted_completion_wait(void *data) |
| { |
| } |
| |
| struct lock_wait_data { |
| struct ldlm_lock *lwd_lock; |
| __u32 lwd_conn_cnt; |
| }; |
| |
| struct ldlm_async_args { |
| struct lustre_handle lock_handle; |
| }; |
| |
| static int ldlm_expired_completion_wait(void *data) |
| { |
| struct lock_wait_data *lwd = data; |
| struct ldlm_lock *lock = lwd->lwd_lock; |
| struct obd_import *imp; |
| struct obd_device *obd; |
| |
| if (!lock->l_conn_export) { |
| static unsigned long next_dump, last_dump; |
| |
| LCONSOLE_WARN("lock timed out (enqueued at %lld, %llds ago)\n", |
| (s64)lock->l_last_activity, |
| (s64)(ktime_get_real_seconds() - |
| lock->l_last_activity)); |
| LDLM_DEBUG(lock, "lock timed out (enqueued at %lld, %llds ago); not entering recovery in server code, just going back to sleep", |
| (s64)lock->l_last_activity, |
| (s64)(ktime_get_real_seconds() - |
| lock->l_last_activity)); |
| if (cfs_time_after(cfs_time_current(), next_dump)) { |
| last_dump = next_dump; |
| next_dump = cfs_time_shift(300); |
| ldlm_namespace_dump(D_DLMTRACE, |
| ldlm_lock_to_ns(lock)); |
| if (last_dump == 0) |
| libcfs_debug_dumplog(); |
| } |
| return 0; |
| } |
| |
| obd = lock->l_conn_export->exp_obd; |
| imp = obd->u.cli.cl_import; |
| ptlrpc_fail_import(imp, lwd->lwd_conn_cnt); |
| LDLM_ERROR(lock, "lock timed out (enqueued at %lld, %llds ago), entering recovery for %s@%s", |
| (s64)lock->l_last_activity, |
| (s64)(ktime_get_real_seconds() - lock->l_last_activity), |
| obd2cli_tgt(obd), imp->imp_connection->c_remote_uuid.uuid); |
| |
| return 0; |
| } |
| |
| /** |
| * Calculate the Completion timeout (covering enqueue, BL AST, data flush, |
| * lock cancel, and their replies). Used for lock completion timeout on the |
| * client side. |
| * |
| * \param[in] lock lock which is waiting the completion callback |
| * |
| * \retval timeout in seconds to wait for the server reply |
| */ |
| /* We use the same basis for both server side and client side functions |
| * from a single node. |
| */ |
| static unsigned int ldlm_cp_timeout(struct ldlm_lock *lock) |
| { |
| unsigned int timeout; |
| |
| if (AT_OFF) |
| return obd_timeout; |
| |
| /* |
| * Wait a long time for enqueue - server may have to callback a |
| * lock from another client. Server will evict the other client if it |
| * doesn't respond reasonably, and then give us the lock. |
| */ |
| timeout = at_get(ldlm_lock_to_ns_at(lock)); |
| return max(3 * timeout, ldlm_enqueue_min); |
| } |
| |
| /** |
| * Helper function for ldlm_completion_ast(), updating timings when lock is |
| * actually granted. |
| */ |
| static int ldlm_completion_tail(struct ldlm_lock *lock, void *data) |
| { |
| long delay; |
| int result = 0; |
| |
| if (ldlm_is_destroyed(lock) || ldlm_is_failed(lock)) { |
| LDLM_DEBUG(lock, "client-side enqueue: destroyed"); |
| result = -EIO; |
| } else if (!data) { |
| LDLM_DEBUG(lock, "client-side enqueue: granted"); |
| } else { |
| /* Take into AT only CP RPC, not immediately granted locks */ |
| delay = ktime_get_real_seconds() - lock->l_last_activity; |
| LDLM_DEBUG(lock, "client-side enqueue: granted after %lds", |
| delay); |
| |
| /* Update our time estimate */ |
| at_measured(ldlm_lock_to_ns_at(lock), delay); |
| } |
| return result; |
| } |
| |
| /** |
| * Implementation of ->l_completion_ast() for a client, that doesn't wait |
| * until lock is granted. Suitable for locks enqueued through ptlrpcd, of |
| * other threads that cannot block for long. |
| */ |
| int ldlm_completion_ast_async(struct ldlm_lock *lock, __u64 flags, void *data) |
| { |
| if (flags == LDLM_FL_WAIT_NOREPROC) { |
| LDLM_DEBUG(lock, "client-side enqueue waiting on pending lock"); |
| return 0; |
| } |
| |
| if (!(flags & LDLM_FL_BLOCKED_MASK)) { |
| wake_up(&lock->l_waitq); |
| return ldlm_completion_tail(lock, data); |
| } |
| |
| LDLM_DEBUG(lock, "client-side enqueue returned a blocked lock, going forward"); |
| return 0; |
| } |
| EXPORT_SYMBOL(ldlm_completion_ast_async); |
| |
| /** |
| * Generic LDLM "completion" AST. This is called in several cases: |
| * |
| * - 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 |
| * been granted; |
| * |
| * - when ldlm_lock_match(LDLM_FL_LVB_READY) is about to wait until lock |
| * gets correct lvb; |
| * |
| * - to force all locks when resource is destroyed (cleanup_resource()); |
| * |
| * - during lock conversion (not used currently). |
| * |
| * If lock is not granted in the first case, this function waits until second |
| * or penultimate cases happen in some other thread. |
| * |
| */ |
| int ldlm_completion_ast(struct ldlm_lock *lock, __u64 flags, void *data) |
| { |
| /* XXX ALLOCATE - 160 bytes */ |
| struct lock_wait_data lwd; |
| struct obd_device *obd; |
| struct obd_import *imp = NULL; |
| struct l_wait_info lwi; |
| __u32 timeout; |
| int rc = 0; |
| |
| if (flags == LDLM_FL_WAIT_NOREPROC) { |
| LDLM_DEBUG(lock, "client-side enqueue waiting on pending lock"); |
| goto noreproc; |
| } |
| |
| if (!(flags & LDLM_FL_BLOCKED_MASK)) { |
| wake_up(&lock->l_waitq); |
| return 0; |
| } |
| |
| LDLM_DEBUG(lock, "client-side enqueue returned a blocked lock, sleeping"); |
| |
| noreproc: |
| |
| obd = class_exp2obd(lock->l_conn_export); |
| |
| /* if this is a local lock, then there is no import */ |
| if (obd) |
| imp = obd->u.cli.cl_import; |
| |
| timeout = ldlm_cp_timeout(lock); |
| |
| lwd.lwd_lock = lock; |
| lock->l_last_activity = ktime_get_real_seconds(); |
| |
| if (ldlm_is_no_timeout(lock)) { |
| LDLM_DEBUG(lock, "waiting indefinitely because of NO_TIMEOUT"); |
| lwi = LWI_INTR(interrupted_completion_wait, &lwd); |
| } else { |
| lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(timeout), |
| ldlm_expired_completion_wait, |
| interrupted_completion_wait, &lwd); |
| } |
| |
| if (imp) { |
| spin_lock(&imp->imp_lock); |
| lwd.lwd_conn_cnt = imp->imp_conn_cnt; |
| spin_unlock(&imp->imp_lock); |
| } |
| |
| if (OBD_FAIL_CHECK_RESET(OBD_FAIL_LDLM_INTR_CP_AST, |
| OBD_FAIL_LDLM_CP_BL_RACE | OBD_FAIL_ONCE)) { |
| ldlm_set_fail_loc(lock); |
| rc = -EINTR; |
| } else { |
| /* Go to sleep until the lock is granted or cancelled. */ |
| rc = l_wait_event(lock->l_waitq, |
| is_granted_or_cancelled(lock), &lwi); |
| } |
| |
| if (rc) { |
| LDLM_DEBUG(lock, "client-side enqueue waking up: failed (%d)", |
| rc); |
| return rc; |
| } |
| |
| return ldlm_completion_tail(lock, data); |
| } |
| EXPORT_SYMBOL(ldlm_completion_ast); |
| |
| static void failed_lock_cleanup(struct ldlm_namespace *ns, |
| struct ldlm_lock *lock, int mode) |
| { |
| int need_cancel = 0; |
| |
| /* Set a flag to prevent us from sending a CANCEL (bug 407) */ |
| 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) && |
| !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. |
| * bug 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); |
| |
| if (need_cancel) |
| LDLM_DEBUG(lock, |
| "setting FL_LOCAL_ONLY | LDLM_FL_FAILED | LDLM_FL_ATOMIC_CB | LDLM_FL_CBPENDING"); |
| else |
| LDLM_DEBUG(lock, "lock was granted or failed in race"); |
| |
| /* XXX - HACK because we shouldn't call ldlm_lock_destroy() |
| * from llite/file.c/ll_file_flock(). |
| */ |
| /* This code makes for the fact that we do not have blocking handler on |
| * a client for flock locks. As such this is the place where we must |
| * completely kill failed locks. (interrupted and those that |
| * were waiting to be granted when server evicted us. |
| */ |
| if (lock->l_resource->lr_type == LDLM_FLOCK) { |
| lock_res_and_lock(lock); |
| if (!ldlm_is_destroyed(lock)) { |
| ldlm_resource_unlink_lock(lock); |
| ldlm_lock_decref_internal_nolock(lock, mode); |
| ldlm_lock_destroy_nolock(lock); |
| } |
| unlock_res_and_lock(lock); |
| } else { |
| ldlm_lock_decref_internal(lock, mode); |
| } |
| } |
| |
| /** |
| * 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, |
| enum ldlm_type type, __u8 with_policy, |
| enum ldlm_mode mode, |
| __u64 *flags, void *lvb, __u32 lvb_len, |
| const struct lustre_handle *lockh, int rc) |
| { |
| struct ldlm_namespace *ns = exp->exp_obd->obd_namespace; |
| int is_replay = *flags & LDLM_FL_REPLAY; |
| struct ldlm_lock *lock; |
| struct ldlm_reply *reply; |
| int cleanup_phase = 1; |
| |
| lock = ldlm_handle2lock(lockh); |
| /* ldlm_cli_enqueue is holding a reference on this lock. */ |
| if (!lock) { |
| LASSERT(type == LDLM_FLOCK); |
| 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) |
| goto cleanup; |
| } |
| |
| /* Before we return, swab the reply */ |
| reply = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP); |
| if (!reply) { |
| rc = -EPROTO; |
| goto cleanup; |
| } |
| |
| if (lvb_len > 0) { |
| int size = 0; |
| |
| 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); |
| rc = size; |
| goto cleanup; |
| } else if (unlikely(size > lvb_len)) { |
| LDLM_ERROR(lock, "Replied LVB is larger than expectation, expected = %d, replied = %d", |
| lvb_len, size); |
| rc = -EINVAL; |
| goto cleanup; |
| } |
| lvb_len = size; |
| } |
| |
| if (rc == ELDLM_LOCK_ABORTED) { |
| if (lvb_len > 0 && lvb) |
| rc = ldlm_fill_lvb(lock, &req->rq_pill, RCL_SERVER, |
| lvb, lvb_len); |
| if (rc == 0) |
| rc = ELDLM_LOCK_ABORTED; |
| goto cleanup; |
| } |
| |
| /* lock enqueued on the server */ |
| cleanup_phase = 0; |
| |
| lock_res_and_lock(lock); |
| /* Key change rehash lock in per-export hash with new key */ |
| if (exp->exp_lock_hash) { |
| /* In the function below, .hs_keycmp resolves to |
| * ldlm_export_lock_keycmp() |
| */ |
| /* coverity[overrun-buffer-val] */ |
| cfs_hash_rehash_key(exp->exp_lock_hash, |
| &lock->l_remote_handle, |
| &reply->lock_handle, |
| &lock->l_exp_hash); |
| } else { |
| lock->l_remote_handle = reply->lock_handle; |
| } |
| |
| *flags = ldlm_flags_from_wire(reply->lock_flags); |
| lock->l_flags |= ldlm_flags_from_wire(reply->lock_flags & |
| LDLM_FL_INHERIT_MASK); |
| unlock_res_and_lock(lock); |
| |
| CDEBUG(D_INFO, "local: %p, remote cookie: %#llx, flags: 0x%llx\n", |
| lock, reply->lock_handle.cookie, *flags); |
| |
| /* If enqueue returned a blocked lock but the completion handler has |
| * already run, then it fixed up the resource and we don't need to do it |
| * again. |
| */ |
| if ((*flags) & LDLM_FL_LOCK_CHANGED) { |
| int newmode = reply->lock_desc.l_req_mode; |
| |
| LASSERT(!is_replay); |
| if (newmode && newmode != lock->l_req_mode) { |
| LDLM_DEBUG(lock, "server returned different mode %s", |
| ldlm_lockname[newmode]); |
| lock->l_req_mode = newmode; |
| } |
| |
| 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) { |
| rc = -ENOMEM; |
| goto cleanup; |
| } |
| 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"); |
| } |
| |
| if ((*flags) & LDLM_FL_AST_SENT || |
| /* Cancel extent locks as soon as possible on a liblustre client, |
| * because it cannot handle asynchronous ASTs robustly (see |
| * bug 7311). |
| */ |
| (LIBLUSTRE_CLIENT && type == LDLM_EXTENT)) { |
| lock_res_and_lock(lock); |
| 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 > 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, as 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, lvb_len); |
| unlock_res_and_lock(lock); |
| if (rc < 0) { |
| cleanup_phase = 1; |
| goto cleanup; |
| } |
| } |
| |
| if (!is_replay) { |
| rc = ldlm_lock_enqueue(ns, &lock, NULL, flags); |
| if (lock->l_completion_ast) { |
| int err = lock->l_completion_ast(lock, *flags, NULL); |
| |
| if (!rc) |
| rc = err; |
| if (rc) |
| cleanup_phase = 1; |
| } |
| } |
| |
| if (lvb_len > 0 && lvb) { |
| /* Copy the LVB here, and not earlier, because the completion |
| * AST (if any) can override what we got in the reply |
| */ |
| memcpy(lvb, lock->l_lvb_data, lvb_len); |
| } |
| |
| LDLM_DEBUG(lock, "client-side enqueue END"); |
| cleanup: |
| if (cleanup_phase == 1 && rc) |
| failed_lock_cleanup(ns, lock, mode); |
| /* Put lock 2 times, the second reference is held by ldlm_cli_enqueue */ |
| LDLM_LOCK_PUT(lock); |
| LDLM_LOCK_RELEASE(lock); |
| return rc; |
| } |
| EXPORT_SYMBOL(ldlm_cli_enqueue_fini); |
| |
| /** |
| * 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, PAGE_SIZE - 512) - req_size; |
| if (likely(avail >= 0)) |
| avail /= (int)sizeof(struct lustre_handle); |
| else |
| avail = 0; |
| avail += LDLM_LOCKREQ_HANDLES - off; |
| |
| return avail; |
| } |
| |
| static inline int ldlm_capsule_handles_avail(struct req_capsule *pill, |
| enum req_location loc, |
| int off) |
| { |
| u32 size = req_capsule_msg_size(pill, loc); |
| |
| return ldlm_req_handles_avail(size, off); |
| } |
| |
| static inline int ldlm_format_handles_avail(struct obd_import *imp, |
| const struct req_format *fmt, |
| enum req_location loc, int off) |
| { |
| u32 size = req_capsule_fmt_size(imp->imp_msg_magic, fmt, loc); |
| |
| return ldlm_req_handles_avail(size, off); |
| } |
| |
| /** |
| * 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, |
| struct list_head *cancels, int count) |
| { |
| struct ldlm_namespace *ns = exp->exp_obd->obd_namespace; |
| struct req_capsule *pill = &req->rq_pill; |
| struct ldlm_request *dlm = NULL; |
| int flags, avail, to_free, pack = 0; |
| LIST_HEAD(head); |
| int rc; |
| |
| if (!cancels) |
| cancels = &head; |
| if (ns_connect_cancelset(ns)) { |
| /* Estimate the amount of available space in the request. */ |
| req_capsule_filled_sizes(pill, RCL_CLIENT); |
| avail = ldlm_capsule_handles_avail(pill, RCL_CLIENT, canceloff); |
| |
| flags = ns_connect_lru_resize(ns) ? |
| LDLM_CANCEL_LRUR_NO_WAIT : LDLM_CANCEL_AGED; |
| 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, which will make us slower. |
| */ |
| if (avail > count) |
| count += ldlm_cancel_lru_local(ns, cancels, to_free, |
| avail - count, 0, flags); |
| if (avail > count) |
| pack = count; |
| else |
| pack = avail; |
| req_capsule_set_size(pill, &RMF_DLM_REQ, RCL_CLIENT, |
| ldlm_request_bufsize(pack, opc)); |
| } |
| |
| rc = ptlrpc_request_pack(req, version, opc); |
| if (rc) { |
| ldlm_lock_list_put(cancels, l_bl_ast, count); |
| return rc; |
| } |
| |
| if (ns_connect_cancelset(ns)) { |
| if (canceloff) { |
| dlm = req_capsule_client_get(pill, &RMF_DLM_REQ); |
| LASSERT(dlm); |
| /* Skip first lock handler in ldlm_request_pack(), |
| * this method will increment @lock_count according |
| * to the lock handle amount actually written to |
| * the buffer. |
| */ |
| dlm->lock_count = canceloff; |
| } |
| /* Pack into the request @pack lock handles. */ |
| ldlm_cli_cancel_list(cancels, pack, req, 0); |
| /* 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); |
| } |
| return 0; |
| } |
| EXPORT_SYMBOL(ldlm_prep_elc_req); |
| |
| int ldlm_prep_enqueue_req(struct obd_export *exp, struct ptlrpc_request *req, |
| struct list_head *cancels, int count) |
| { |
| return ldlm_prep_elc_req(exp, req, LUSTRE_DLM_VERSION, LDLM_ENQUEUE, |
| LDLM_ENQUEUE_CANCEL_OFF, cancels, count); |
| } |
| EXPORT_SYMBOL(ldlm_prep_enqueue_req); |
| |
| /** |
| * 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 \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 \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, enum lvb_type lvb_type, |
| struct lustre_handle *lockh, int async) |
| { |
| struct ldlm_namespace *ns; |
| struct ldlm_lock *lock; |
| struct ldlm_request *body; |
| int is_replay = *flags & LDLM_FL_REPLAY; |
| int req_passed_in = 1; |
| int rc, err; |
| struct ptlrpc_request *req; |
| |
| 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 nicely. |
| */ |
| if (is_replay) { |
| lock = ldlm_handle2lock_long(lockh, 0); |
| LASSERT(lock); |
| 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 |
| }; |
| lock = ldlm_lock_create(ns, res_id, einfo->ei_type, |
| einfo->ei_mode, &cbs, einfo->ei_cbdata, |
| lvb_len, lvb_type); |
| if (IS_ERR(lock)) |
| return PTR_ERR(lock); |
| /* for the local lock, add the reference */ |
| ldlm_lock_addref_internal(lock, einfo->ei_mode); |
| ldlm_lock2handle(lock, lockh); |
| if (policy) |
| lock->l_policy_data = *policy; |
| |
| if (einfo->ei_type == LDLM_EXTENT) { |
| /* extent lock without policy is a bug */ |
| if (!policy) |
| LBUG(); |
| |
| lock->l_req_extent = policy->l_extent; |
| } |
| LDLM_DEBUG(lock, "client-side enqueue START, flags %llx", |
| *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 | LDLM_FL_EXCL)); |
| lock->l_last_activity = ktime_get_real_seconds(); |
| |
| /* lock not sent to server yet */ |
| |
| if (!reqp || !*reqp) { |
| req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp), |
| &RQF_LDLM_ENQUEUE, |
| LUSTRE_DLM_VERSION, |
| LDLM_ENQUEUE); |
| if (!req) { |
| failed_lock_cleanup(ns, lock, einfo->ei_mode); |
| LDLM_LOCK_RELEASE(lock); |
| return -ENOMEM; |
| } |
| req_passed_in = 0; |
| if (reqp) |
| *reqp = req; |
| } else { |
| int len; |
| |
| req = *reqp; |
| len = req_capsule_get_size(&req->rq_pill, &RMF_DLM_REQ, |
| RCL_CLIENT); |
| LASSERTF(len >= sizeof(*body), "buflen[%d] = %d, not %d\n", |
| DLM_LOCKREQ_OFF, len, (int)sizeof(*body)); |
| } |
| |
| /* Dump lock data into the request buffer */ |
| body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ); |
| ldlm_lock2desc(lock, &body->lock_desc); |
| body->lock_flags = ldlm_flags_to_wire(*flags); |
| body->lock_handle[0] = *lockh; |
| |
| /* 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); |
| } |
| |
| /* |
| * Liblustre client doesn't get extent locks, except for O_APPEND case |
| * where [0, OBD_OBJECT_EOF] lock is taken, or truncate, where |
| * [i_size, OBD_OBJECT_EOF] lock is taken. |
| */ |
| LASSERT(ergo(LIBLUSTRE_CLIENT, einfo->ei_type != LDLM_EXTENT || |
| policy->l_extent.end == OBD_OBJECT_EOF)); |
| |
| if (async) { |
| LASSERT(reqp); |
| return 0; |
| } |
| |
| LDLM_DEBUG(lock, "sending request"); |
| |
| rc = ptlrpc_queue_wait(req); |
| |
| err = ldlm_cli_enqueue_fini(exp, req, einfo->ei_type, policy ? 1 : 0, |
| einfo->ei_mode, flags, lvb, lvb_len, |
| lockh, rc); |
| |
| /* If ldlm_cli_enqueue_fini did not find the lock, we need to free |
| * one reference that we took |
| */ |
| if (err == -ENOLCK) |
| LDLM_LOCK_RELEASE(lock); |
| else |
| rc = err; |
| |
| if (!req_passed_in && req) { |
| ptlrpc_req_finished(req); |
| if (reqp) |
| *reqp = NULL; |
| } |
| |
| return rc; |
| } |
| EXPORT_SYMBOL(ldlm_cli_enqueue); |
| |
| /** |
| * Cancel locks locally. |
| * Returns: |
| * \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; |
| |
| if (lock->l_conn_export) { |
| bool local_only; |
| |
| LDLM_DEBUG(lock, "client-side cancel"); |
| /* Set this flag to prevent others from getting new references*/ |
| lock_res_and_lock(lock); |
| ldlm_set_cbpending(lock); |
| local_only = !!(lock->l_flags & |
| (LDLM_FL_LOCAL_ONLY | LDLM_FL_CANCEL_ON_BLOCK)); |
| 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 instruction)\n"); |
| rc = LDLM_FL_LOCAL_ONLY; |
| } |
| ldlm_lock_cancel(lock); |
| } else { |
| LDLM_ERROR(lock, "Trying to cancel local lock"); |
| LBUG(); |
| } |
| |
| return rc; |
| } |
| |
| /** |
| * Pack \a count locks in \a head into ldlm_request buffer of request \a req. |
| */ |
| static void ldlm_cancel_pack(struct ptlrpc_request *req, |
| struct list_head *head, int count) |
| { |
| struct ldlm_request *dlm; |
| struct ldlm_lock *lock; |
| int max, packed = 0; |
| |
| dlm = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ); |
| LASSERT(dlm); |
| |
| /* Check the room in the request buffer. */ |
| max = req_capsule_get_size(&req->rq_pill, &RMF_DLM_REQ, RCL_CLIENT) - |
| sizeof(struct ldlm_request); |
| max /= sizeof(struct lustre_handle); |
| max += LDLM_LOCKREQ_HANDLES; |
| LASSERT(max >= dlm->lock_count + count); |
| |
| /* XXX: it would be better to pack lock handles grouped by resource. |
| * so that the server cancel would call filter_lvbo_update() less |
| * frequently. |
| */ |
| list_for_each_entry(lock, head, l_bl_ast) { |
| if (!count--) |
| break; |
| LASSERT(lock->l_conn_export); |
| /* Pack the lock handle to the given request buffer. */ |
| LDLM_DEBUG(lock, "packing"); |
| dlm->lock_handle[dlm->lock_count++] = lock->l_remote_handle; |
| packed++; |
| } |
| CDEBUG(D_DLMTRACE, "%d locks packed\n", packed); |
| } |
| |
| /** |
| * Prepare and send a batched cancel RPC. It will include \a count lock |
| * handles of locks given in \a cancels list. |
| */ |
| static int ldlm_cli_cancel_req(struct obd_export *exp, |
| struct list_head *cancels, |
| int count, enum ldlm_cancel_flags flags) |
| { |
| struct ptlrpc_request *req = NULL; |
| struct obd_import *imp; |
| int free, sent = 0; |
| int rc = 0; |
| |
| LASSERT(exp); |
| LASSERT(count > 0); |
| |
| CFS_FAIL_TIMEOUT(OBD_FAIL_LDLM_PAUSE_CANCEL, cfs_fail_val); |
| |
| if (CFS_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_RACE)) |
| return count; |
| |
| free = ldlm_format_handles_avail(class_exp2cliimp(exp), |
| &RQF_LDLM_CANCEL, RCL_CLIENT, 0); |
| if (count > free) |
| count = free; |
| |
| while (1) { |
| imp = class_exp2cliimp(exp); |
| if (!imp || imp->imp_invalid) { |
| CDEBUG(D_DLMTRACE, |
| "skipping cancel on invalid import %p\n", imp); |
| return count; |
| } |
| |
| req = ptlrpc_request_alloc(imp, &RQF_LDLM_CANCEL); |
| if (!req) { |
| rc = -ENOMEM; |
| goto out; |
| } |
| |
| req_capsule_filled_sizes(&req->rq_pill, RCL_CLIENT); |
| req_capsule_set_size(&req->rq_pill, &RMF_DLM_REQ, RCL_CLIENT, |
| ldlm_request_bufsize(count, LDLM_CANCEL)); |
| |
| rc = ptlrpc_request_pack(req, LUSTRE_DLM_VERSION, LDLM_CANCEL); |
| if (rc) { |
| ptlrpc_request_free(req); |
| goto out; |
| } |
| |
| req->rq_request_portal = LDLM_CANCEL_REQUEST_PORTAL; |
| req->rq_reply_portal = LDLM_CANCEL_REPLY_PORTAL; |
| ptlrpc_at_set_req_timeout(req); |
| |
| ldlm_cancel_pack(req, cancels, count); |
| |
| ptlrpc_request_set_replen(req); |
| if (flags & LCF_ASYNC) { |
| ptlrpcd_add_req(req); |
| sent = count; |
| goto out; |
| } |
| |
| rc = ptlrpc_queue_wait(req); |
| if (rc == LUSTRE_ESTALE) { |
| CDEBUG(D_DLMTRACE, "client/server (nid %s) out of sync -- not fatal\n", |
| libcfs_nid2str(req->rq_import-> |
| imp_connection->c_peer.nid)); |
| rc = 0; |
| } else if (rc == -ETIMEDOUT && /* check there was no reconnect*/ |
| req->rq_import_generation == imp->imp_generation) { |
| ptlrpc_req_finished(req); |
| continue; |
| } else if (rc != ELDLM_OK) { |
| /* -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; |
| } |
| |
| ptlrpc_req_finished(req); |
| out: |
| return sent ? sent : rc; |
| } |
| |
| static inline struct ldlm_pool *ldlm_imp2pl(struct obd_import *imp) |
| { |
| return &imp->imp_obd->obd_namespace->ns_pool; |
| } |
| |
| /** |
| * Update client's OBD pool related fields with new SLV and Limit from \a req. |
| */ |
| int ldlm_cli_update_pool(struct ptlrpc_request *req) |
| { |
| struct obd_device *obd; |
| __u64 new_slv; |
| __u32 new_limit; |
| |
| if (unlikely(!req->rq_import || !req->rq_import->imp_obd || |
| !imp_connect_lru_resize(req->rq_import))) { |
| /* |
| * Do nothing for corner cases. |
| */ |
| 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 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 (SLV: %llu, Limit: %u)", |
| lustre_msg_get_slv(req->rq_repmsg), |
| lustre_msg_get_limit(req->rq_repmsg)); |
| return 0; |
| } |
| |
| new_limit = lustre_msg_get_limit(req->rq_repmsg); |
| new_slv = lustre_msg_get_slv(req->rq_repmsg); |
| obd = req->rq_import->imp_obd; |
| |
| /* 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; |
| write_unlock(&obd->obd_pool_lock); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(ldlm_cli_update_pool); |
| |
| /** |
| * Client side lock cancel. |
| * |
| * Lock must not have any readers or writers by this time. |
| */ |
| int ldlm_cli_cancel(const struct lustre_handle *lockh, |
| enum ldlm_cancel_flags cancel_flags) |
| { |
| struct obd_export *exp; |
| int avail, flags, count = 1; |
| __u64 rc = 0; |
| struct ldlm_namespace *ns; |
| struct ldlm_lock *lock; |
| LIST_HEAD(cancels); |
| |
| /* concurrent cancels on the same handle can happen */ |
| lock = ldlm_handle2lock_long(lockh, LDLM_FL_CANCELING); |
| if (!lock) { |
| LDLM_DEBUG_NOLOCK("lock is already being destroyed"); |
| return 0; |
| } |
| |
| rc = ldlm_cli_cancel_local(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. |
| */ |
| LASSERT(list_empty(&lock->l_bl_ast)); |
| list_add(&lock->l_bl_ast, &cancels); |
| |
| exp = lock->l_conn_export; |
| if (exp_connect_cancelset(exp)) { |
| avail = ldlm_format_handles_avail(class_exp2cliimp(exp), |
| &RQF_LDLM_CANCEL, |
| RCL_CLIENT, 0); |
| LASSERT(avail > 0); |
| |
| ns = ldlm_lock_to_ns(lock); |
| flags = ns_connect_lru_resize(ns) ? |
| LDLM_CANCEL_LRUR : LDLM_CANCEL_AGED; |
| count += ldlm_cancel_lru_local(ns, &cancels, 0, avail - 1, |
| LCF_BL_AST, flags); |
| } |
| ldlm_cli_cancel_list(&cancels, count, NULL, cancel_flags); |
| return 0; |
| } |
| EXPORT_SYMBOL(ldlm_cli_cancel); |
| |
| /** |
| * Locally cancel up to \a count locks in list \a cancels. |
| * Return the number of cancelled locks. |
| */ |
| int ldlm_cli_cancel_list_local(struct list_head *cancels, int count, |
| enum ldlm_cancel_flags flags) |
| { |
| LIST_HEAD(head); |
| struct ldlm_lock *lock, *next; |
| int left = 0, bl_ast = 0; |
| __u64 rc; |
| |
| left = count; |
| list_for_each_entry_safe(lock, next, cancels, l_bl_ast) { |
| if (left-- == 0) |
| break; |
| |
| if (flags & LCF_LOCAL) { |
| rc = LDLM_FL_LOCAL_ONLY; |
| ldlm_lock_cancel(lock); |
| } else { |
| rc = ldlm_cli_cancel_local(lock); |
| } |
| /* 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"); |
| list_del_init(&lock->l_bl_ast); |
| list_add(&lock->l_bl_ast, &head); |
| bl_ast++; |
| continue; |
| } |
| if (rc == LDLM_FL_LOCAL_ONLY) { |
| /* CANCEL RPC should not be sent to server. */ |
| list_del_init(&lock->l_bl_ast); |
| LDLM_LOCK_RELEASE(lock); |
| count--; |
| } |
| } |
| if (bl_ast > 0) { |
| count -= bl_ast; |
| ldlm_cli_cancel_list(&head, bl_ast, NULL, 0); |
| } |
| |
| return count; |
| } |
| 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. |
| * readahead requests, ...) |
| */ |
| static enum ldlm_policy_res |
| ldlm_cancel_no_wait_policy(struct ldlm_namespace *ns, struct ldlm_lock *lock, |
| int unused, int added, int count) |
| { |
| enum ldlm_policy_res result = LDLM_POLICY_CANCEL_LOCK; |
| |
| /* 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 (ns->ns_cancel && ns->ns_cancel(lock) != 0) |
| 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. 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 |
| * |
| * \retval LDLM_POLICY_CANCEL_LOCK cancel lock from LRU |
| */ |
| static enum ldlm_policy_res ldlm_cancel_lrur_policy(struct ldlm_namespace *ns, |
| struct ldlm_lock *lock, |
| int unused, int added, |
| int count) |
| { |
| unsigned long cur = cfs_time_current(); |
| struct ldlm_pool *pl = &ns->ns_pool; |
| __u64 slv, lvf, lv; |
| unsigned long la; |
| |
| /* Stop LRU processing when we reach past @count or have checked all |
| * locks in LRU. |
| */ |
| if (count && added >= count) |
| return LDLM_POLICY_KEEP_LOCK; |
| |
| slv = ldlm_pool_get_slv(pl); |
| lvf = ldlm_pool_get_lvf(pl); |
| la = cfs_duration_sec(cfs_time_sub(cur, lock->l_last_used)); |
| lv = lvf * la * unused; |
| |
| /* Inform pool about current CLV to see it via debugfs. */ |
| ldlm_pool_set_clv(pl, lv); |
| |
| /* Stop when SLV is not yet come from server or lv is smaller than |
| * it is. |
| */ |
| if (slv == 0 || lv < slv) |
| return LDLM_POLICY_KEEP_LOCK; |
| |
| return LDLM_POLICY_CANCEL_LOCK; |
| } |
| |
| /** |
| * Callback function for debugfs 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. |
| * |
| * \retval LDLM_POLICY_KEEP_LOCK keep lock in LRU in stop scanning |
| * |
| * \retval LDLM_POLICY_CANCEL_LOCK cancel lock from LRU |
| */ |
| static enum ldlm_policy_res ldlm_cancel_passed_policy(struct ldlm_namespace *ns, |
| struct ldlm_lock *lock, |
| int unused, int added, |
| int count) |
| { |
| /* 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 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 enum ldlm_policy_res ldlm_cancel_aged_policy(struct ldlm_namespace *ns, |
| struct ldlm_lock *lock, |
| int unused, int added, |
| int count) |
| { |
| if ((added >= count) && |
| time_before(cfs_time_current(), |
| cfs_time_add(lock->l_last_used, ns->ns_max_age))) |
| return LDLM_POLICY_KEEP_LOCK; |
| |
| return LDLM_POLICY_CANCEL_LOCK; |
| } |
| |
| static enum ldlm_policy_res |
| ldlm_cancel_lrur_no_wait_policy(struct ldlm_namespace *ns, |
| struct ldlm_lock *lock, |
| int unused, int added, |
| int count) |
| { |
| enum ldlm_policy_res result; |
| |
| result = ldlm_cancel_lrur_policy(ns, lock, unused, added, count); |
| if (result == LDLM_POLICY_KEEP_LOCK) |
| return result; |
| |
| return ldlm_cancel_no_wait_policy(ns, lock, unused, added, 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 enum ldlm_policy_res |
| ldlm_cancel_default_policy(struct ldlm_namespace *ns, struct ldlm_lock *lock, |
| int unused, int added, int count) |
| { |
| /* 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; |
| } |
| |
| typedef enum ldlm_policy_res (*ldlm_cancel_lru_policy_t)( |
| struct ldlm_namespace *, |
| struct ldlm_lock *, int, |
| int, int); |
| |
| static ldlm_cancel_lru_policy_t |
| ldlm_cancel_lru_policy(struct ldlm_namespace *ns, int flags) |
| { |
| if (flags & LDLM_CANCEL_NO_WAIT) |
| return ldlm_cancel_no_wait_policy; |
| |
| if (ns_connect_lru_resize(ns)) { |
| if (flags & LDLM_CANCEL_SHRINK) |
| /* We kill passed number of old locks. */ |
| return ldlm_cancel_passed_policy; |
| else if (flags & LDLM_CANCEL_LRUR) |
| return ldlm_cancel_lrur_policy; |
| else if (flags & LDLM_CANCEL_PASSED) |
| return ldlm_cancel_passed_policy; |
| else if (flags & LDLM_CANCEL_LRUR_NO_WAIT) |
| return ldlm_cancel_lrur_no_wait_policy; |
| } else { |
| if (flags & LDLM_CANCEL_AGED) |
| return ldlm_cancel_aged_policy; |
| } |
| |
| return ldlm_cancel_default_policy; |
| } |
| |
| /** |
| * - 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 \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 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: |
| * ---------------------------------------- |
| * flags & LDLM_CANCEL_LRUR - use LRU resize policy (SLV from server) to |
| * cancel not more than \a count locks; |
| * |
| * 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 \a count locks according to |
| * memory pressure policy function; |
| * |
| * 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. |
| */ |
| static int ldlm_prepare_lru_list(struct ldlm_namespace *ns, |
| struct list_head *cancels, int count, int max, |
| int flags) |
| { |
| ldlm_cancel_lru_policy_t pf; |
| struct ldlm_lock *lock, *next; |
| int added = 0, unused, remained; |
| int no_wait = flags & (LDLM_CANCEL_NO_WAIT | LDLM_CANCEL_LRUR_NO_WAIT); |
| |
| spin_lock(&ns->ns_lock); |
| unused = ns->ns_nr_unused; |
| remained = unused; |
| |
| if (!ns_connect_lru_resize(ns)) |
| count += unused - ns->ns_max_unused; |
| |
| pf = ldlm_cancel_lru_policy(ns, flags); |
| LASSERT(pf); |
| |
| while (!list_empty(&ns->ns_unused_list)) { |
| enum ldlm_policy_res result; |
| time_t last_use = 0; |
| |
| /* all unused locks */ |
| if (remained-- <= 0) |
| break; |
| |
| /* For any flags, stop scanning if @max is reached. */ |
| if (max && added >= max) |
| break; |
| |
| list_for_each_entry_safe(lock, next, &ns->ns_unused_list, |
| l_lru) { |
| /* No locks which got blocking requests. */ |
| LASSERT(!ldlm_is_bl_ast(lock)); |
| |
| if (no_wait && ldlm_is_skipped(lock)) |
| /* already processed */ |
| continue; |
| |
| last_use = lock->l_last_used; |
| if (last_use == cfs_time_current()) |
| continue; |
| |
| /* 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); |
| spin_unlock(&ns->ns_lock); |
| lu_ref_add(&lock->l_reference, __func__, 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, |
| __func__, 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_check(lock, last_use) == 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 or |
| * the lock has been used since the pf() call and |
| * pages could be put under it. |
| */ |
| unlock_res_and_lock(lock); |
| lu_ref_del(&lock->l_reference, |
| __func__, 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(list_empty(&lock->l_bl_ast)); |
| list_add(&lock->l_bl_ast, cancels); |
| unlock_res_and_lock(lock); |
| lu_ref_del(&lock->l_reference, __func__, current); |
| spin_lock(&ns->ns_lock); |
| added++; |
| unused--; |
| } |
| spin_unlock(&ns->ns_lock); |
| return added; |
| } |
| |
| int ldlm_cancel_lru_local(struct ldlm_namespace *ns, |
| struct list_head *cancels, int count, int max, |
| enum ldlm_cancel_flags cancel_flags, int flags) |
| { |
| int added; |
| |
| added = ldlm_prepare_lru_list(ns, cancels, count, max, flags); |
| if (added <= 0) |
| return added; |
| return ldlm_cli_cancel_list_local(cancels, added, cancel_flags); |
| } |
| |
| /** |
| * 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 LCF_ASYNC the blocking |
| * callback will be performed in this function. |
| */ |
| int ldlm_cancel_lru(struct ldlm_namespace *ns, int nr, |
| enum ldlm_cancel_flags cancel_flags, |
| int flags) |
| { |
| LIST_HEAD(cancels); |
| int count, rc; |
| |
| /* 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 \a cancels |
| * list. |
| */ |
| int ldlm_cancel_resource_local(struct ldlm_resource *res, |
| struct list_head *cancels, |
| ldlm_policy_data_t *policy, |
| enum ldlm_mode mode, __u64 lock_flags, |
| enum ldlm_cancel_flags cancel_flags, |
| void *opaque) |
| { |
| struct ldlm_lock *lock; |
| int count = 0; |
| |
| lock_res(res); |
| list_for_each_entry(lock, &res->lr_granted, l_res_link) { |
| if (opaque && lock->l_ast_data != opaque) { |
| LDLM_ERROR(lock, "data %p doesn't match opaque %p", |
| lock->l_ast_data, opaque); |
| continue; |
| } |
| |
| if (lock->l_readers || lock->l_writers) |
| 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; |
| |
| /* If policy is given and this is IBITS lock, add to list only |
| * those locks that match by policy. |
| */ |
| if (policy && (lock->l_resource->lr_type == LDLM_IBITS) && |
| !(lock->l_policy_data.l_inodebits.bits & |
| policy->l_inodebits.bits)) |
| continue; |
| |
| /* See CBPENDING comment in ldlm_cancel_lru */ |
| lock->l_flags |= LDLM_FL_CBPENDING | LDLM_FL_CANCELING | |
| lock_flags; |
| |
| LASSERT(list_empty(&lock->l_bl_ast)); |
| list_add(&lock->l_bl_ast, cancels); |
| LDLM_LOCK_GET(lock); |
| count++; |
| } |
| unlock_res(res); |
| |
| return ldlm_cli_cancel_list_local(cancels, count, cancel_flags); |
| } |
| EXPORT_SYMBOL(ldlm_cancel_resource_local); |
| |
| /** |
| * 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 \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(struct list_head *cancels, int count, |
| struct ptlrpc_request *req, |
| enum ldlm_cancel_flags flags) |
| { |
| struct ldlm_lock *lock; |
| int res = 0; |
| |
| if (list_empty(cancels) || count == 0) |
| return 0; |
| |
| /* 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 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) { |
| LASSERT(!list_empty(cancels)); |
| lock = list_entry(cancels->next, struct ldlm_lock, l_bl_ast); |
| LASSERT(lock->l_conn_export); |
| |
| if (exp_connect_cancelset(lock->l_conn_export)) { |
| res = count; |
| if (req) |
| ldlm_cancel_pack(req, cancels, count); |
| else |
| res = ldlm_cli_cancel_req(lock->l_conn_export, |
| cancels, count, |
| flags); |
| } else { |
| res = ldlm_cli_cancel_req(lock->l_conn_export, |
| cancels, 1, flags); |
| } |
| |
| 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); |
| } |
| LASSERT(count == 0); |
| return 0; |
| } |
| 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, |
| enum ldlm_mode mode, |
| enum ldlm_cancel_flags flags, |
| void *opaque) |
| { |
| struct ldlm_resource *res; |
| LIST_HEAD(cancels); |
| int count; |
| int rc; |
| |
| res = ldlm_resource_get(ns, NULL, res_id, 0, 0); |
| if (IS_ERR(res)) { |
| /* This is not a problem. */ |
| CDEBUG(D_INFO, "No resource %llu\n", res_id->name[0]); |
| return 0; |
| } |
| |
| LDLM_RESOURCE_ADDREF(res); |
| count = ldlm_cancel_resource_local(res, &cancels, policy, mode, |
| 0, flags | LCF_BL_AST, opaque); |
| rc = ldlm_cli_cancel_list(&cancels, count, NULL, flags); |
| if (rc != ELDLM_OK) |
| CERROR("canceling unused lock "DLDLMRES": rc = %d\n", |
| PLDLMRES(res), rc); |
| |
| LDLM_RESOURCE_DELREF(res); |
| ldlm_resource_putref(res); |
| return 0; |
| } |
| EXPORT_SYMBOL(ldlm_cli_cancel_unused_resource); |
| |
| struct ldlm_cli_cancel_arg { |
| int lc_flags; |
| void *lc_opaque; |
| }; |
| |
| static int ldlm_cli_hash_cancel_unused(struct cfs_hash *hs, |
| struct cfs_hash_bd *bd, |
| struct hlist_node *hnode, void *arg) |
| { |
| 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) |
| * that have 0 readers/writers. |
| * |
| * If flags & LCF_LOCAL, throw the locks away without trying |
| * to notify the server. |
| */ |
| int ldlm_cli_cancel_unused(struct ldlm_namespace *ns, |
| const struct ldlm_res_id *res_id, |
| enum ldlm_cancel_flags flags, void *opaque) |
| { |
| struct ldlm_cli_cancel_arg arg = { |
| .lc_flags = flags, |
| .lc_opaque = opaque, |
| }; |
| |
| if (!ns) |
| return ELDLM_OK; |
| |
| if (res_id) { |
| return ldlm_cli_cancel_unused_resource(ns, res_id, NULL, |
| LCK_MINMODE, flags, |
| opaque); |
| } else { |
| cfs_hash_for_each_nolock(ns->ns_rs_hash, |
| ldlm_cli_hash_cancel_unused, &arg); |
| return ELDLM_OK; |
| } |
| } |
| EXPORT_SYMBOL(ldlm_cli_cancel_unused); |
| |
| /* Lock iterators. */ |
| |
| static int ldlm_resource_foreach(struct ldlm_resource *res, |
| ldlm_iterator_t iter, void *closure) |
| { |
| struct list_head *tmp, *next; |
| struct ldlm_lock *lock; |
| int rc = LDLM_ITER_CONTINUE; |
| |
| if (!res) |
| return LDLM_ITER_CONTINUE; |
| |
| lock_res(res); |
| list_for_each_safe(tmp, next, &res->lr_granted) { |
| lock = list_entry(tmp, struct ldlm_lock, l_res_link); |
| |
| if (iter(lock, closure) == LDLM_ITER_STOP) { |
| rc = LDLM_ITER_STOP; |
| goto out; |
| } |
| } |
| |
| list_for_each_safe(tmp, next, &res->lr_waiting) { |
| lock = list_entry(tmp, struct ldlm_lock, l_res_link); |
| |
| if (iter(lock, closure) == LDLM_ITER_STOP) { |
| rc = LDLM_ITER_STOP; |
| goto out; |
| } |
| } |
| out: |
| unlock_res(res); |
| return rc; |
| } |
| |
| struct iter_helper_data { |
| ldlm_iterator_t iter; |
| void *closure; |
| }; |
| |
| static int ldlm_iter_helper(struct ldlm_lock *lock, void *closure) |
| { |
| struct iter_helper_data *helper = closure; |
| |
| return helper->iter(lock, helper->closure); |
| } |
| |
| static int ldlm_res_iter_helper(struct cfs_hash *hs, struct cfs_hash_bd *bd, |
| struct hlist_node *hnode, void *arg) |
| |
| { |
| struct ldlm_resource *res = cfs_hash_object(hs, hnode); |
| |
| return ldlm_resource_foreach(res, ldlm_iter_helper, arg) == |
| LDLM_ITER_STOP; |
| } |
| |
| static void ldlm_namespace_foreach(struct ldlm_namespace *ns, |
| ldlm_iterator_t iter, void *closure) |
| |
| { |
| struct iter_helper_data helper = { |
| .iter = iter, |
| .closure = closure, |
| }; |
| |
| cfs_hash_for_each_nolock(ns->ns_rs_hash, |
| ldlm_res_iter_helper, &helper); |
| } |
| |
| /* non-blocking function to manipulate a lock whose cb_data is being put away. |
| * return 0: find no resource |
| * > 0: must be LDLM_ITER_STOP/LDLM_ITER_CONTINUE. |
| * < 0: errors |
| */ |
| int ldlm_resource_iterate(struct ldlm_namespace *ns, |
| const struct ldlm_res_id *res_id, |
| ldlm_iterator_t iter, void *data) |
| { |
| struct ldlm_resource *res; |
| int rc; |
| |
| LASSERTF(ns, "must pass in namespace\n"); |
| |
| res = ldlm_resource_get(ns, NULL, res_id, 0, 0); |
| if (IS_ERR(res)) |
| return 0; |
| |
| LDLM_RESOURCE_ADDREF(res); |
| rc = ldlm_resource_foreach(res, iter, data); |
| LDLM_RESOURCE_DELREF(res); |
| ldlm_resource_putref(res); |
| return rc; |
| } |
| EXPORT_SYMBOL(ldlm_resource_iterate); |
| |
| /* Lock replay */ |
| |
| static int ldlm_chain_lock_for_replay(struct ldlm_lock *lock, void *closure) |
| { |
| struct list_head *list = closure; |
| |
| /* we use l_pending_chain here, because it's unused on clients. */ |
| LASSERTF(list_empty(&lock->l_pending_chain), |
| "lock %p next %p prev %p\n", |
| lock, &lock->l_pending_chain.next, |
| &lock->l_pending_chain.prev); |
| /* bug 9573: don't replay locks left after eviction, or |
| * bug 17614: locks being actively cancelled. Get a reference |
| * on a lock so that it does not disappear under us (e.g. due to cancel) |
| */ |
| if (!(lock->l_flags & (LDLM_FL_FAILED | LDLM_FL_CANCELING))) { |
| list_add(&lock->l_pending_chain, list); |
| LDLM_LOCK_GET(lock); |
| } |
| |
| return LDLM_ITER_CONTINUE; |
| } |
| |
| static int replay_lock_interpret(const struct lu_env *env, |
| struct ptlrpc_request *req, |
| struct ldlm_async_args *aa, int rc) |
| { |
| struct ldlm_lock *lock; |
| struct ldlm_reply *reply; |
| struct obd_export *exp; |
| |
| atomic_dec(&req->rq_import->imp_replay_inflight); |
| if (rc != ELDLM_OK) |
| goto out; |
| |
| reply = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP); |
| if (!reply) { |
| rc = -EPROTO; |
| goto out; |
| } |
| |
| lock = ldlm_handle2lock(&aa->lock_handle); |
| if (!lock) { |
| CERROR("received replay ack for unknown local cookie %#llx remote cookie %#llx from server %s id %s\n", |
| aa->lock_handle.cookie, reply->lock_handle.cookie, |
| req->rq_export->exp_client_uuid.uuid, |
| libcfs_id2str(req->rq_peer)); |
| rc = -ESTALE; |
| goto out; |
| } |
| |
| /* Key change rehash lock in per-export hash with new key */ |
| exp = req->rq_export; |
| if (exp && exp->exp_lock_hash) { |
| /* In the function below, .hs_keycmp resolves to |
| * ldlm_export_lock_keycmp() |
| */ |
| /* coverity[overrun-buffer-val] */ |
| cfs_hash_rehash_key(exp->exp_lock_hash, |
| &lock->l_remote_handle, |
| &reply->lock_handle, |
| &lock->l_exp_hash); |
| } else { |
| lock->l_remote_handle = reply->lock_handle; |
| } |
| |
| LDLM_DEBUG(lock, "replayed lock:"); |
| ptlrpc_import_recovery_state_machine(req->rq_import); |
| LDLM_LOCK_PUT(lock); |
| out: |
| if (rc != ELDLM_OK) |
| ptlrpc_connect_import(req->rq_import); |
| |
| return rc; |
| } |
| |
| static int replay_one_lock(struct obd_import *imp, struct ldlm_lock *lock) |
| { |
| struct ptlrpc_request *req; |
| struct ldlm_async_args *aa; |
| struct ldlm_request *body; |
| int flags; |
| |
| /* Bug 11974: Do not replay a lock which is actively being canceled */ |
| 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 (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. |
| * |
| * If they differ, but we have a granted mode, then we were granted |
| * one mode and now want another: ergo, converting. |
| * |
| * If we haven't been granted anything and are on a resource list, |
| * then we're blocked/waiting. |
| * |
| * If we haven't been granted anything and we're NOT on a resource list, |
| * then we haven't got a reply yet and don't have a known disposition. |
| * This happens whenever a lock enqueue is the request that triggers |
| * recovery. |
| */ |
| if (lock->l_granted_mode == lock->l_req_mode) |
| flags = LDLM_FL_REPLAY | LDLM_FL_BLOCK_GRANTED; |
| else if (lock->l_granted_mode) |
| flags = LDLM_FL_REPLAY | LDLM_FL_BLOCK_CONV; |
| else if (!list_empty(&lock->l_res_link)) |
| flags = LDLM_FL_REPLAY | LDLM_FL_BLOCK_WAIT; |
| else |
| flags = LDLM_FL_REPLAY; |
| |
| req = ptlrpc_request_alloc_pack(imp, &RQF_LDLM_ENQUEUE, |
| LUSTRE_DLM_VERSION, LDLM_ENQUEUE); |
| if (!req) |
| return -ENOMEM; |
| |
| /* We're part of recovery, so don't wait for it. */ |
| req->rq_send_state = LUSTRE_IMP_REPLAY_LOCKS; |
| |
| body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ); |
| ldlm_lock2desc(lock, &body->lock_desc); |
| 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); |
| 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); |
| |
| LDLM_DEBUG(lock, "replaying lock:"); |
| |
| 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); |
| |
| return 0; |
| } |
| |
| /** |
| * Cancel as many unused locks as possible before replay. since we are |
| * in recovery, we can't wait for any outstanding RPCs to send any RPC |
| * to the server. |
| * |
| * Called only in recovery before replaying locks. there is no need to |
| * replay locks that are unused. since the clients may hold thousands of |
| * cached unused locks, dropping the unused locks can greatly reduce the |
| * load on the servers at recovery time. |
| */ |
| static void ldlm_cancel_unused_locks_for_replay(struct ldlm_namespace *ns) |
| { |
| int canceled; |
| LIST_HEAD(cancels); |
| |
| CDEBUG(D_DLMTRACE, "Dropping as many unused locks as possible before replay for namespace %s (%d)\n", |
| ldlm_ns_name(ns), ns->ns_nr_unused); |
| |
| /* We don't need to care whether or not LRU resize is enabled |
| * because the LDLM_CANCEL_NO_WAIT policy doesn't use the |
| * count parameter |
| */ |
| canceled = ldlm_cancel_lru_local(ns, &cancels, ns->ns_nr_unused, 0, |
| LCF_LOCAL, LDLM_CANCEL_NO_WAIT); |
| |
| CDEBUG(D_DLMTRACE, "Canceled %d unused locks from namespace %s\n", |
| canceled, ldlm_ns_name(ns)); |
| } |
| |
| int ldlm_replay_locks(struct obd_import *imp) |
| { |
| struct ldlm_namespace *ns = imp->imp_obd->obd_namespace; |
| LIST_HEAD(list); |
| struct ldlm_lock *lock, *next; |
| int rc = 0; |
| |
| LASSERT(atomic_read(&imp->imp_replay_inflight) == 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 */ |
| atomic_inc(&imp->imp_replay_inflight); |
| |
| if (ldlm_cancel_unused_locks_before_replay) |
| ldlm_cancel_unused_locks_for_replay(ns); |
| |
| ldlm_namespace_foreach(ns, ldlm_chain_lock_for_replay, &list); |
| |
| list_for_each_entry_safe(lock, next, &list, l_pending_chain) { |
| 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); |
| } |
| |
| atomic_dec(&imp->imp_replay_inflight); |
| |
| return rc; |
| } |
| EXPORT_SYMBOL(ldlm_replay_locks); |