-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
- *
+/*
* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
* GPL HEADER END
*/
/*
- * Copyright 2008 Sun Microsystems, Inc. All rights reserved
- * Use is subject to license terms.
- *
* Copyright (c) 2003 Hewlett-Packard Development Company LP.
* Developed under the sponsorship of the US Government under
* Subcontract No. B514193
+ *
+ * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2010, 2014, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*/
+/**
+ * This file implements POSIX lock type for Lustre.
+ * Its policy properties are start and end of extent and PID.
+ *
+ * These locks are only done through MDS due to POSIX semantics requiring
+ * e.g. that locks could be only partially released and as such split into
+ * two parts, and also that two adjacent locks from the same process may be
+ * merged into a single wider lock.
+ *
+ * Lock modes are mapped like this:
+ * PR and PW for READ and WRITE locks
+ * NL to request a releasing of a portion of the lock
+ *
+ * These flock locks never timeout.
+ */
+
#define DEBUG_SUBSYSTEM S_LDLM
-#ifdef __KERNEL__
+#include <linux/list.h>
#include <lustre_dlm.h>
#include <obd_support.h>
#include <obd_class.h>
#include <lustre_lib.h>
-#include <libcfs/list.h>
-#else
-#include <liblustre.h>
-#include <obd_class.h>
-#endif
#include "ldlm_internal.h"
-#define l_flock_waitq l_lru
-
-/**
- * Wait queue for Posix lock deadlock detection, added with
- * ldlm_lock::l_flock_waitq.
- */
-static CFS_LIST_HEAD(ldlm_flock_waitq);
-/**
- * Lock protecting access to ldlm_flock_waitq.
- */
-cfs_spinlock_t ldlm_flock_waitq_lock = CFS_SPIN_LOCK_UNLOCKED;
-
int ldlm_flock_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
void *data, int flag);
static inline int
ldlm_same_flock_owner(struct ldlm_lock *lock, struct ldlm_lock *new)
{
- return((new->l_policy_data.l_flock.pid ==
- lock->l_policy_data.l_flock.pid) &&
+ return((new->l_policy_data.l_flock.owner ==
+ lock->l_policy_data.l_flock.owner) &&
(new->l_export == lock->l_export));
}
lock->l_policy_data.l_flock.start));
}
+static inline void ldlm_flock_blocking_link(struct ldlm_lock *req,
+ struct ldlm_lock *lock)
+{
+ /* For server only */
+ if (req->l_export == NULL)
+ return;
+
+ LASSERT(hlist_unhashed(&req->l_exp_flock_hash));
+
+ req->l_policy_data.l_flock.blocking_owner =
+ lock->l_policy_data.l_flock.owner;
+ req->l_policy_data.l_flock.blocking_export =
+ lock->l_export;
+ atomic_set(&req->l_policy_data.l_flock.blocking_refs, 0);
+
+ cfs_hash_add(req->l_export->exp_flock_hash,
+ &req->l_policy_data.l_flock.owner,
+ &req->l_exp_flock_hash);
+}
+
+static inline void ldlm_flock_blocking_unlink(struct ldlm_lock *req)
+{
+ /* For server only */
+ if (req->l_export == NULL)
+ return;
+
+ check_res_locked(req->l_resource);
+ if (req->l_export->exp_flock_hash != NULL &&
+ !hlist_unhashed(&req->l_exp_flock_hash))
+ cfs_hash_del(req->l_export->exp_flock_hash,
+ &req->l_policy_data.l_flock.owner,
+ &req->l_exp_flock_hash);
+}
+
static inline void
-ldlm_flock_destroy(struct ldlm_lock *lock, ldlm_mode_t mode, int flags)
+ldlm_flock_destroy(struct ldlm_lock *lock, enum ldlm_mode mode, __u64 flags)
{
- ENTRY;
+ ENTRY;
- LDLM_DEBUG(lock, "ldlm_flock_destroy(mode: %d, flags: 0x%x)",
- mode, flags);
+ LDLM_DEBUG(lock, "ldlm_flock_destroy(mode: %d, flags: %#llx)",
+ mode, flags);
- /* Safe to not lock here, since it should be empty anyway */
- LASSERT(cfs_list_empty(&lock->l_flock_waitq));
+ /* Safe to not lock here, since it should be empty anyway */
+ LASSERT(hlist_unhashed(&lock->l_exp_flock_hash));
- cfs_list_del_init(&lock->l_res_link);
- if (flags == LDLM_FL_WAIT_NOREPROC &&
- !(lock->l_flags & LDLM_FL_FAILED)) {
- /* client side - set a flag to prevent sending a CANCEL */
- lock->l_flags |= LDLM_FL_LOCAL_ONLY | LDLM_FL_CBPENDING;
+ list_del_init(&lock->l_res_link);
+ if (flags == LDLM_FL_WAIT_NOREPROC) {
+ /* client side - set a flag to prevent sending a CANCEL */
+ lock->l_flags |= LDLM_FL_LOCAL_ONLY | LDLM_FL_CBPENDING;
/* when reaching here, it is under lock_res_and_lock(). Thus,
need call the nolock version of ldlm_lock_decref_internal*/
EXIT;
}
-static int
-ldlm_flock_deadlock(struct ldlm_lock *req, struct ldlm_lock *blocking_lock)
+/**
+ * POSIX locks deadlock detection code.
+ *
+ * Given a new lock \a req and an existing lock \a bl_lock it conflicts
+ * with, we need to iterate through all blocked POSIX locks for this
+ * export and see if there is a deadlock condition arising. (i.e. when
+ * one client holds a lock on something and want a lock on something
+ * else and at the same time another client has the opposite situation).
+ */
+
+struct ldlm_flock_lookup_cb_data {
+ __u64 *bl_owner;
+ struct ldlm_lock *lock;
+ struct obd_export *exp;
+};
+
+static int ldlm_flock_lookup_cb(struct cfs_hash *hs, struct cfs_hash_bd *bd,
+ struct hlist_node *hnode, void *data)
{
- struct obd_export *req_export = req->l_export;
- struct obd_export *blocking_export = blocking_lock->l_export;
- pid_t req_pid = req->l_policy_data.l_flock.pid;
- pid_t blocking_pid = blocking_lock->l_policy_data.l_flock.pid;
- struct ldlm_lock *lock;
+ struct ldlm_flock_lookup_cb_data *cb_data = data;
+ struct obd_export *exp = cfs_hash_object(hs, hnode);
+ struct ldlm_lock *lock;
- cfs_spin_lock(&ldlm_flock_waitq_lock);
-restart:
- cfs_list_for_each_entry(lock, &ldlm_flock_waitq, l_flock_waitq) {
- if ((lock->l_policy_data.l_flock.pid != blocking_pid) ||
- (lock->l_export != blocking_export))
- continue;
+ lock = cfs_hash_lookup(exp->exp_flock_hash, cb_data->bl_owner);
+ if (lock == NULL)
+ return 0;
+
+ /* Stop on first found lock. Same process can't sleep twice */
+ cb_data->lock = lock;
+ cb_data->exp = class_export_get(exp);
+
+ return 1;
+}
- blocking_pid = lock->l_policy_data.l_flock.blocking_pid;
- blocking_export = (struct obd_export *)(long)
- lock->l_policy_data.l_flock.blocking_export;
- if (blocking_pid == req_pid && blocking_export == req_export) {
- cfs_spin_unlock(&ldlm_flock_waitq_lock);
+static int
+ldlm_flock_deadlock(struct ldlm_lock *req, struct ldlm_lock *bl_lock)
+{
+ struct obd_export *req_exp = req->l_export;
+ struct obd_export *bl_exp = bl_lock->l_export;
+ __u64 req_owner = req->l_policy_data.l_flock.owner;
+ __u64 bl_owner = bl_lock->l_policy_data.l_flock.owner;
+
+ /* For server only */
+ if (req_exp == NULL)
+ return 0;
+
+ class_export_get(bl_exp);
+ while (1) {
+ struct ldlm_flock_lookup_cb_data cb_data = {
+ .bl_owner = &bl_owner,
+ .lock = NULL,
+ .exp = NULL };
+ struct obd_export *bl_exp_new;
+ struct ldlm_lock *lock = NULL;
+ struct ldlm_flock *flock;
+
+ if (bl_exp->exp_flock_hash != NULL) {
+ cfs_hash_for_each_key(bl_exp->exp_obd->obd_nid_hash,
+ &bl_exp->exp_connection->c_peer.nid,
+ ldlm_flock_lookup_cb, &cb_data);
+ lock = cb_data.lock;
+ }
+ if (lock == NULL)
+ break;
+
+ class_export_put(bl_exp);
+ bl_exp = cb_data.exp;
+
+ LASSERT(req != lock);
+ flock = &lock->l_policy_data.l_flock;
+ LASSERT(flock->owner == bl_owner);
+ bl_owner = flock->blocking_owner;
+ bl_exp_new = class_export_get(flock->blocking_export);
+ class_export_put(bl_exp);
+
+ cfs_hash_put(bl_exp->exp_flock_hash, &lock->l_exp_flock_hash);
+ bl_exp = bl_exp_new;
+
+ if (bl_exp->exp_failed)
+ break;
+
+ if (bl_owner == req_owner &&
+ (bl_exp->exp_connection->c_peer.nid ==
+ req_exp->exp_connection->c_peer.nid)) {
+ class_export_put(bl_exp);
return 1;
}
-
- goto restart;
}
- cfs_spin_unlock(&ldlm_flock_waitq_lock);
+ class_export_put(bl_exp);
return 0;
}
-int
-ldlm_process_flock_lock(struct ldlm_lock *req, int *flags, int first_enq,
- ldlm_error_t *err, cfs_list_t *work_list)
+static void ldlm_flock_cancel_on_deadlock(struct ldlm_lock *lock,
+ struct list_head *work_list)
{
- struct ldlm_resource *res = req->l_resource;
- struct ldlm_namespace *ns = res->lr_namespace;
- cfs_list_t *tmp;
- cfs_list_t *ownlocks = NULL;
- struct ldlm_lock *lock = NULL;
- struct ldlm_lock *new = req;
- struct ldlm_lock *new2 = NULL;
- ldlm_mode_t mode = req->l_req_mode;
- int local = ns_is_client(ns);
- int added = (mode == LCK_NL);
- int overlaps = 0;
- int splitted = 0;
- const struct ldlm_callback_suite null_cbs = { NULL };
- ENTRY;
+ CDEBUG(D_INFO, "reprocess deadlock req=%p\n", lock);
+
+ if ((exp_connect_flags(lock->l_export) &
+ OBD_CONNECT_FLOCK_DEAD) == 0) {
+ CERROR("deadlock found, but client doesn't "
+ "support flock canceliation\n");
+ } else {
+ LASSERT(lock->l_completion_ast);
+ LASSERT(!ldlm_is_ast_sent(lock));
+ lock->l_flags |= LDLM_FL_AST_SENT | LDLM_FL_CANCEL_ON_BLOCK |
+ LDLM_FL_FLOCK_DEADLOCK;
+ ldlm_flock_blocking_unlink(lock);
+ ldlm_resource_unlink_lock(lock);
+ ldlm_add_ast_work_item(lock, NULL, work_list);
+ }
+}
- CDEBUG(D_DLMTRACE, "flags %#x pid %u mode %u start "LPU64" end "LPU64
- "\n", *flags, new->l_policy_data.l_flock.pid, mode,
+/**
+ * Process a granting attempt for flock lock.
+ * Must be called under ns lock held.
+ *
+ * This function looks for any conflicts for \a lock in the granted or
+ * waiting queues. The lock is granted if no conflicts are found in
+ * either queue.
+ *
+ * It is also responsible for splitting a lock if a portion of the lock
+ * is released.
+ *
+ * If \a first_enq is 0 (ie, called from ldlm_reprocess_queue):
+ * - blocking ASTs have already been sent
+ *
+ * If \a first_enq is 1 (ie, called from ldlm_lock_enqueue):
+ * - blocking ASTs have not been sent yet, so list of conflicting locks
+ * would be collected and ASTs sent.
+ */
+int
+ldlm_process_flock_lock(struct ldlm_lock *req, __u64 *flags, int first_enq,
+ enum ldlm_error *err, struct list_head *work_list)
+{
+ struct ldlm_resource *res = req->l_resource;
+ struct ldlm_namespace *ns = ldlm_res_to_ns(res);
+ struct list_head *tmp;
+ struct list_head *ownlocks = NULL;
+ struct ldlm_lock *lock = NULL;
+ struct ldlm_lock *new = req;
+ struct ldlm_lock *new2 = NULL;
+ enum ldlm_mode mode = req->l_req_mode;
+ int local = ns_is_client(ns);
+ int added = (mode == LCK_NL);
+ int overlaps = 0;
+ int splitted = 0;
+ const struct ldlm_callback_suite null_cbs = { NULL };
+ ENTRY;
+
+ CDEBUG(D_DLMTRACE, "flags %#llx owner %llu pid %u mode %u start "
+ "%llu end %llu\n", *flags,
+ new->l_policy_data.l_flock.owner,
+ new->l_policy_data.l_flock.pid, mode,
req->l_policy_data.l_flock.start,
req->l_policy_data.l_flock.end);
if ((*flags == LDLM_FL_WAIT_NOREPROC) || (mode == LCK_NL)) {
/* This loop determines where this processes locks start
* in the resource lr_granted list. */
- cfs_list_for_each(tmp, &res->lr_granted) {
- lock = cfs_list_entry(tmp, struct ldlm_lock,
+ list_for_each(tmp, &res->lr_granted) {
+ lock = list_entry(tmp, struct ldlm_lock,
l_res_link);
if (ldlm_same_flock_owner(lock, req)) {
ownlocks = tmp;
}
}
} else {
+ int reprocess_failed = 0;
lockmode_verify(mode);
/* This loop determines if there are existing locks
* that conflict with the new lock request. */
- cfs_list_for_each(tmp, &res->lr_granted) {
- lock = cfs_list_entry(tmp, struct ldlm_lock,
+ list_for_each(tmp, &res->lr_granted) {
+ lock = list_entry(tmp, struct ldlm_lock,
l_res_link);
if (ldlm_same_flock_owner(lock, req)) {
if (!ldlm_flocks_overlap(lock, req))
continue;
- if (!first_enq)
- RETURN(LDLM_ITER_CONTINUE);
+ if (!first_enq) {
+ reprocess_failed = 1;
+ if (ldlm_flock_deadlock(req, lock)) {
+ ldlm_flock_cancel_on_deadlock(req,
+ work_list);
+ RETURN(LDLM_ITER_CONTINUE);
+ }
+ continue;
+ }
if (*flags & LDLM_FL_BLOCK_NOWAIT) {
ldlm_flock_destroy(req, mode, *flags);
RETURN(LDLM_ITER_STOP);
}
- if (ldlm_flock_deadlock(req, lock)) {
- ldlm_flock_destroy(req, mode, *flags);
- *err = -EDEADLK;
- RETURN(LDLM_ITER_STOP);
- }
-
- req->l_policy_data.l_flock.blocking_pid =
- lock->l_policy_data.l_flock.pid;
- req->l_policy_data.l_flock.blocking_export =
- (long)(void *)lock->l_export;
+ /* add lock to blocking list before deadlock
+ * check to prevent race */
+ ldlm_flock_blocking_link(req, lock);
- LASSERT(cfs_list_empty(&req->l_flock_waitq));
- cfs_spin_lock(&ldlm_flock_waitq_lock);
- cfs_list_add_tail(&req->l_flock_waitq,
- &ldlm_flock_waitq);
- cfs_spin_unlock(&ldlm_flock_waitq_lock);
+ if (ldlm_flock_deadlock(req, lock)) {
+ ldlm_flock_blocking_unlink(req);
+ ldlm_flock_destroy(req, mode, *flags);
+ *err = -EDEADLK;
+ RETURN(LDLM_ITER_STOP);
+ }
ldlm_resource_add_lock(res, &res->lr_waiting, req);
*flags |= LDLM_FL_BLOCK_GRANTED;
RETURN(LDLM_ITER_STOP);
}
+ if (reprocess_failed)
+ RETURN(LDLM_ITER_CONTINUE);
}
if (*flags & LDLM_FL_TEST_LOCK) {
}
/* In case we had slept on this lock request take it off of the
- * deadlock detection waitq. */
- cfs_spin_lock(&ldlm_flock_waitq_lock);
- cfs_list_del_init(&req->l_flock_waitq);
- cfs_spin_unlock(&ldlm_flock_waitq_lock);
+ * deadlock detection hash list. */
+ ldlm_flock_blocking_unlink(req);
/* Scan the locks owned by this process that overlap this request.
* We may have to merge or split existing locks. */
ownlocks = &res->lr_granted;
list_for_remaining_safe(ownlocks, tmp, &res->lr_granted) {
- lock = cfs_list_entry(ownlocks, struct ldlm_lock, l_res_link);
+ lock = list_entry(ownlocks, struct ldlm_lock, l_res_link);
if (!ldlm_same_flock_owner(lock, new))
break;
* it must see the original lock data in the reply. */
/* XXX - if ldlm_lock_new() can sleep we should
- * release the ns_lock, allocate the new lock,
+ * release the lr_lock, allocate the new lock,
* and restart processing this lock. */
- if (!new2) {
- unlock_res_and_lock(req);
- new2 = ldlm_lock_create(ns, &res->lr_name, LDLM_FLOCK,
- lock->l_granted_mode, &null_cbs,
- NULL, 0);
- lock_res_and_lock(req);
- if (!new2) {
- ldlm_flock_destroy(req, lock->l_granted_mode,
- *flags);
- *err = -ENOLCK;
- RETURN(LDLM_ITER_STOP);
- }
- goto reprocess;
- }
+ if (new2 == NULL) {
+ unlock_res_and_lock(req);
+ new2 = ldlm_lock_create(ns, &res->lr_name, LDLM_FLOCK,
+ lock->l_granted_mode, &null_cbs,
+ NULL, 0, LVB_T_NONE);
+ lock_res_and_lock(req);
+ if (IS_ERR(new2)) {
+ ldlm_flock_destroy(req, lock->l_granted_mode,
+ *flags);
+ *err = PTR_ERR(new2);
+ RETURN(LDLM_ITER_STOP);
+ }
+ goto reprocess;
+ }
splitted = 1;
new2->l_granted_mode = lock->l_granted_mode;
new2->l_policy_data.l_flock.pid =
new->l_policy_data.l_flock.pid;
+ new2->l_policy_data.l_flock.owner =
+ new->l_policy_data.l_flock.owner;
new2->l_policy_data.l_flock.start =
lock->l_policy_data.l_flock.start;
new2->l_policy_data.l_flock.end =
if (lock->l_export != NULL) {
new2->l_export = class_export_lock_get(lock->l_export, new2);
if (new2->l_export->exp_lock_hash &&
- cfs_hlist_unhashed(&new2->l_exp_hash))
+ hlist_unhashed(&new2->l_exp_hash))
cfs_hash_add(new2->l_export->exp_lock_hash,
&new2->l_remote_handle,
&new2->l_exp_hash);
/* Add req to the granted queue before calling ldlm_reprocess_all(). */
if (!added) {
- cfs_list_del_init(&req->l_res_link);
+ list_del_init(&req->l_res_link);
/* insert new lock before ownlocks in list. */
ldlm_resource_add_lock(res, ownlocks, req);
}
if (*flags != LDLM_FL_WAIT_NOREPROC) {
+#ifdef HAVE_SERVER_SUPPORT
if (first_enq) {
/* If this is an unlock, reprocess the waitq and
* send completions ASTs for locks that can now be
* note that ldlm_process_flock_lock() will recurse,
* but only once because first_enq will be false from
* ldlm_reprocess_queue. */
- if ((mode == LCK_NL) && overlaps) {
- CFS_LIST_HEAD(rpc_list);
+ if ((mode == LCK_NL) && overlaps) {
+ struct list_head rpc_list;
int rc;
+
+ INIT_LIST_HEAD(&rpc_list);
restart:
ldlm_reprocess_queue(res, &res->lr_waiting,
&rpc_list);
unlock_res_and_lock(req);
- rc = ldlm_run_ast_work(&rpc_list,
+ rc = ldlm_run_ast_work(ns, &rpc_list,
LDLM_WORK_CP_AST);
lock_res_and_lock(req);
- if (rc == -ERESTART)
- GOTO(restart, -ERESTART);
+ if (rc == -ERESTART)
+ GOTO(restart, rc);
}
} else {
LASSERT(req->l_completion_ast);
ldlm_add_ast_work_item(req, NULL, work_list);
}
+#else /* !HAVE_SERVER_SUPPORT */
+ /* The only one possible case for client-side calls flock
+ * policy function is ldlm_flock_completion_ast inside which
+ * carries LDLM_FL_WAIT_NOREPROC flag. */
+ CERROR("Illegal parameter for client-side-only module.\n");
+ LBUG();
+#endif /* HAVE_SERVER_SUPPORT */
}
- /* In case we're reprocessing the requested lock we can't destroy
- * it until after calling ldlm_ast_work_item() above so that lawi()
- * can bump the reference count on req. Otherwise req could be freed
- * before the completion AST can be sent. */
+ /* In case we're reprocessing the requested lock we can't destroy
+ * it until after calling ldlm_add_ast_work_item() above so that laawi()
+ * can bump the reference count on \a req. Otherwise \a req
+ * could be freed before the completion AST can be sent. */
if (added)
ldlm_flock_destroy(req, mode, *flags);
lock = ((struct ldlm_flock_wait_data *)data)->fwd_lock;
- /* take lock off the deadlock detection waitq. */
- cfs_spin_lock(&ldlm_flock_waitq_lock);
- cfs_list_del_init(&lock->l_flock_waitq);
- cfs_spin_unlock(&ldlm_flock_waitq_lock);
+ /* take lock off the deadlock detection hash list. */
+ lock_res_and_lock(lock);
+ ldlm_flock_blocking_unlink(lock);
- /* client side - set flag to prevent lock from being put on lru list */
- lock->l_flags |= LDLM_FL_CBPENDING;
+ /* client side - set flag to prevent lock from being put on LRU list */
+ ldlm_set_cbpending(lock);
+ unlock_res_and_lock(lock);
EXIT;
}
/**
- * Flock completion calback function.
+ * Flock completion callback function.
*
* \param lock [in,out]: A lock to be handled
* \param flags [in]: flags
* \retval <0 : failure
*/
int
-ldlm_flock_completion_ast(struct ldlm_lock *lock, int flags, void *data)
+ldlm_flock_completion_ast(struct ldlm_lock *lock, __u64 flags, void *data)
{
- cfs_flock_t *getlk = lock->l_ast_data;
- struct obd_device *obd;
- struct obd_import *imp = NULL;
- struct ldlm_flock_wait_data fwd;
- struct l_wait_info lwi;
- ldlm_error_t err;
- int rc = 0;
- ENTRY;
-
- CDEBUG(D_DLMTRACE, "flags: 0x%x data: %p getlk: %p\n",
- flags, data, getlk);
-
- /* Import invalidation. We need to actually release the lock
- * references being held, so that it can go away. No point in
- * holding the lock even if app still believes it has it, since
- * server already dropped it anyway. Only for granted locks too. */
- if ((lock->l_flags & (LDLM_FL_FAILED|LDLM_FL_LOCAL_ONLY)) ==
- (LDLM_FL_FAILED|LDLM_FL_LOCAL_ONLY)) {
- if (lock->l_req_mode == lock->l_granted_mode &&
- lock->l_granted_mode != LCK_NL &&
- NULL == data)
- ldlm_lock_decref_internal(lock, lock->l_req_mode);
-
- /* Need to wake up the waiter if we were evicted */
- cfs_waitq_signal(&lock->l_waitq);
- RETURN(0);
- }
-
- LASSERT(flags != LDLM_FL_WAIT_NOREPROC);
-
- if (!(flags & (LDLM_FL_BLOCK_WAIT | LDLM_FL_BLOCK_GRANTED |
- LDLM_FL_BLOCK_CONV))) {
- if (NULL == data)
- /* mds granted the lock in the reply */
- goto granted;
- /* CP AST RPC: lock get granted, wake it up */
- cfs_waitq_signal(&lock->l_waitq);
- RETURN(0);
- }
+ struct file_lock *getlk = lock->l_ast_data;
+ struct obd_device *obd;
+ struct obd_import *imp = NULL;
+ struct ldlm_flock_wait_data fwd;
+ struct l_wait_info lwi;
+ enum ldlm_error err;
+ int rc = 0;
+ ENTRY;
+
+ OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_CP_CB_WAIT2, 4);
+ if (OBD_FAIL_PRECHECK(OBD_FAIL_LDLM_CP_CB_WAIT3)) {
+ lock_res_and_lock(lock);
+ lock->l_flags |= LDLM_FL_FAIL_LOC;
+ unlock_res_and_lock(lock);
+ OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_CP_CB_WAIT3, 4);
+ }
+ CDEBUG(D_DLMTRACE, "flags: %#llx data: %p getlk: %p\n",
+ flags, data, getlk);
+
+ LASSERT(flags != LDLM_FL_WAIT_NOREPROC);
+
+ if (flags & LDLM_FL_FAILED)
+ goto granted;
+
+ if (!(flags & LDLM_FL_BLOCKED_MASK)) {
+ if (NULL == data)
+ /* mds granted the lock in the reply */
+ goto granted;
+ /* CP AST RPC: lock get granted, wake it up */
+ wake_up(&lock->l_waitq);
+ RETURN(0);
+ }
LDLM_DEBUG(lock, "client-side enqueue returned a blocked lock, "
"sleeping");
imp = obd->u.cli.cl_import;
if (NULL != imp) {
- cfs_spin_lock(&imp->imp_lock);
- fwd.fwd_generation = imp->imp_generation;
- cfs_spin_unlock(&imp->imp_lock);
+ spin_lock(&imp->imp_lock);
+ fwd.fwd_generation = imp->imp_generation;
+ spin_unlock(&imp->imp_lock);
}
lwi = LWI_TIMEOUT_INTR(0, NULL, ldlm_flock_interrupted_wait, &fwd);
granted:
OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_CP_CB_WAIT, 10);
- if (lock->l_destroyed) {
- LDLM_DEBUG(lock, "client-side enqueue waking up: destroyed");
- RETURN(0);
- }
-
- if (lock->l_flags & LDLM_FL_FAILED) {
- LDLM_DEBUG(lock, "client-side enqueue waking up: failed");
- RETURN(-EIO);
- }
-
- if (rc) {
- LDLM_DEBUG(lock, "client-side enqueue waking up: failed (%d)",
- rc);
- RETURN(rc);
- }
-
- LDLM_DEBUG(lock, "client-side enqueue granted");
-
- /* take lock off the deadlock detection waitq. */
- cfs_spin_lock(&ldlm_flock_waitq_lock);
- cfs_list_del_init(&lock->l_flock_waitq);
- cfs_spin_unlock(&ldlm_flock_waitq_lock);
+ if (OBD_FAIL_PRECHECK(OBD_FAIL_LDLM_CP_CB_WAIT4)) {
+ lock_res_and_lock(lock);
+ /* DEADLOCK is always set with CBPENDING */
+ lock->l_flags |= LDLM_FL_FLOCK_DEADLOCK | LDLM_FL_CBPENDING;
+ unlock_res_and_lock(lock);
+ OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_CP_CB_WAIT4, 4);
+ }
+ if (OBD_FAIL_PRECHECK(OBD_FAIL_LDLM_CP_CB_WAIT5)) {
+ lock_res_and_lock(lock);
+ /* DEADLOCK is always set with CBPENDING */
+ lock->l_flags |= LDLM_FL_FAIL_LOC |
+ LDLM_FL_FLOCK_DEADLOCK | LDLM_FL_CBPENDING;
+ unlock_res_and_lock(lock);
+ OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_CP_CB_WAIT5, 4);
+ }
+
+ lock_res_and_lock(lock);
+
+
+ /* Protect against race where lock could have been just destroyed
+ * due to overlap in ldlm_process_flock_lock().
+ */
+ if (ldlm_is_destroyed(lock)) {
+ unlock_res_and_lock(lock);
+ LDLM_DEBUG(lock, "client-side enqueue waking up: destroyed");
+
+ /* An error is still to be returned, to propagate it up to
+ * ldlm_cli_enqueue_fini() caller. */
+ RETURN(-EIO);
+ }
/* ldlm_lock_enqueue() has already placed lock on the granted list. */
- cfs_list_del_init(&lock->l_res_link);
-
- lock_res_and_lock(lock);
- if (flags & LDLM_FL_TEST_LOCK) {
+ ldlm_resource_unlink_lock(lock);
+
+ /* Import invalidation. We need to actually release the lock
+ * references being held, so that it can go away. No point in
+ * holding the lock even if app still believes it has it, since
+ * server already dropped it anyway. Only for granted locks too. */
+ /* Do the same for DEADLOCK'ed locks. */
+ if (ldlm_is_failed(lock) || ldlm_is_flock_deadlock(lock)) {
+ int mode;
+
+ if (flags & LDLM_FL_TEST_LOCK)
+ LASSERT(ldlm_is_test_lock(lock));
+
+ if (ldlm_is_test_lock(lock) || ldlm_is_flock_deadlock(lock))
+ mode = flock_type(getlk);
+ else
+ mode = lock->l_granted_mode;
+
+ if (ldlm_is_flock_deadlock(lock)) {
+ LDLM_DEBUG(lock, "client-side enqueue deadlock "
+ "received");
+ rc = -EDEADLK;
+ }
+ ldlm_flock_destroy(lock, mode, LDLM_FL_WAIT_NOREPROC);
+ unlock_res_and_lock(lock);
+
+ /* Need to wake up the waiter if we were evicted */
+ wake_up(&lock->l_waitq);
+
+ /* An error is still to be returned, to propagate it up to
+ * ldlm_cli_enqueue_fini() caller. */
+ RETURN(rc ? : -EIO);
+ }
+
+ LDLM_DEBUG(lock, "client-side enqueue granted");
+
+ if (flags & LDLM_FL_TEST_LOCK) {
/* fcntl(F_GETLK) request */
/* The old mode was saved in getlk->fl_type so that if the mode
* in the lock changes we can decref the appropriate refcount.*/
- ldlm_flock_destroy(lock, cfs_flock_type(getlk),
- LDLM_FL_WAIT_NOREPROC);
- switch (lock->l_granted_mode) {
- case LCK_PR:
- cfs_flock_set_type(getlk, F_RDLCK);
- break;
- case LCK_PW:
- cfs_flock_set_type(getlk, F_WRLCK);
- break;
- default:
- cfs_flock_set_type(getlk, F_UNLCK);
- }
- cfs_flock_set_pid(getlk,
- (pid_t)lock->l_policy_data.l_flock.pid);
- cfs_flock_set_start(getlk,
- (loff_t)lock->l_policy_data.l_flock.start);
- cfs_flock_set_end(getlk,
- (loff_t)lock->l_policy_data.l_flock.end);
- } else {
- int noreproc = LDLM_FL_WAIT_NOREPROC;
-
- /* We need to reprocess the lock to do merges or splits
- * with existing locks owned by this process. */
- ldlm_process_flock_lock(lock, &noreproc, 1, &err, NULL);
- }
- unlock_res_and_lock(lock);
- RETURN(0);
+ LASSERT(ldlm_is_test_lock(lock));
+ ldlm_flock_destroy(lock, flock_type(getlk),
+ LDLM_FL_WAIT_NOREPROC);
+ switch (lock->l_granted_mode) {
+ case LCK_PR:
+ flock_set_type(getlk, F_RDLCK);
+ break;
+ case LCK_PW:
+ flock_set_type(getlk, F_WRLCK);
+ break;
+ default:
+ flock_set_type(getlk, F_UNLCK);
+ }
+ flock_set_pid(getlk, (pid_t)lock->l_policy_data.l_flock.pid);
+ flock_set_start(getlk,
+ (loff_t)lock->l_policy_data.l_flock.start);
+ flock_set_end(getlk,
+ (loff_t)lock->l_policy_data.l_flock.end);
+ } else {
+ __u64 noreproc = LDLM_FL_WAIT_NOREPROC;
+
+ /* We need to reprocess the lock to do merges or splits
+ * with existing locks owned by this process. */
+ ldlm_process_flock_lock(lock, &noreproc, 1, &err, NULL);
+ }
+ unlock_res_and_lock(lock);
+ RETURN(rc);
}
EXPORT_SYMBOL(ldlm_flock_completion_ast);
int ldlm_flock_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
void *data, int flag)
{
- struct ldlm_namespace *ns;
ENTRY;
LASSERT(lock);
LASSERT(flag == LDLM_CB_CANCELING);
- ns = lock->l_resource->lr_namespace;
-
- /* take lock off the deadlock detection waitq. */
- cfs_spin_lock(&ldlm_flock_waitq_lock);
- cfs_list_del_init(&lock->l_flock_waitq);
- cfs_spin_unlock(&ldlm_flock_waitq_lock);
+ /* take lock off the deadlock detection hash list. */
+ lock_res_and_lock(lock);
+ ldlm_flock_blocking_unlink(lock);
+ unlock_res_and_lock(lock);
RETURN(0);
}
+
+void ldlm_flock_policy_wire_to_local(const union ldlm_wire_policy_data *wpolicy,
+ union ldlm_policy_data *lpolicy)
+{
+ lpolicy->l_flock.start = wpolicy->l_flock.lfw_start;
+ lpolicy->l_flock.end = wpolicy->l_flock.lfw_end;
+ lpolicy->l_flock.pid = wpolicy->l_flock.lfw_pid;
+ lpolicy->l_flock.owner = wpolicy->l_flock.lfw_owner;
+}
+
+void ldlm_flock_policy_local_to_wire(const union ldlm_policy_data *lpolicy,
+ union ldlm_wire_policy_data *wpolicy)
+{
+ memset(wpolicy, 0, sizeof(*wpolicy));
+ wpolicy->l_flock.lfw_start = lpolicy->l_flock.start;
+ wpolicy->l_flock.lfw_end = lpolicy->l_flock.end;
+ wpolicy->l_flock.lfw_pid = lpolicy->l_flock.pid;
+ wpolicy->l_flock.lfw_owner = lpolicy->l_flock.owner;
+}
+
+/*
+ * Export handle<->flock hash operations.
+ */
+static unsigned
+ldlm_export_flock_hash(struct cfs_hash *hs, const void *key, unsigned mask)
+{
+ return cfs_hash_u64_hash(*(__u64 *)key, mask);
+}
+
+static void *
+ldlm_export_flock_key(struct hlist_node *hnode)
+{
+ struct ldlm_lock *lock;
+
+ lock = hlist_entry(hnode, struct ldlm_lock, l_exp_flock_hash);
+ return &lock->l_policy_data.l_flock.owner;
+}
+
+static int
+ldlm_export_flock_keycmp(const void *key, struct hlist_node *hnode)
+{
+ return !memcmp(ldlm_export_flock_key(hnode), key, sizeof(__u64));
+}
+
+static void *
+ldlm_export_flock_object(struct hlist_node *hnode)
+{
+ return hlist_entry(hnode, struct ldlm_lock, l_exp_flock_hash);
+}
+
+static void
+ldlm_export_flock_get(struct cfs_hash *hs, struct hlist_node *hnode)
+{
+ struct ldlm_lock *lock;
+ struct ldlm_flock *flock;
+
+ lock = hlist_entry(hnode, struct ldlm_lock, l_exp_flock_hash);
+ LDLM_LOCK_GET(lock);
+
+ flock = &lock->l_policy_data.l_flock;
+ LASSERT(flock->blocking_export != NULL);
+ class_export_get(flock->blocking_export);
+ atomic_inc(&flock->blocking_refs);
+}
+
+static void
+ldlm_export_flock_put(struct cfs_hash *hs, struct hlist_node *hnode)
+{
+ struct ldlm_lock *lock;
+ struct ldlm_flock *flock;
+
+ lock = hlist_entry(hnode, struct ldlm_lock, l_exp_flock_hash);
+
+ flock = &lock->l_policy_data.l_flock;
+ LASSERT(flock->blocking_export != NULL);
+ class_export_put(flock->blocking_export);
+ if (atomic_dec_and_test(&flock->blocking_refs)) {
+ flock->blocking_owner = 0;
+ flock->blocking_export = NULL;
+ }
+ LDLM_LOCK_RELEASE(lock);
+}
+
+static struct cfs_hash_ops ldlm_export_flock_ops = {
+ .hs_hash = ldlm_export_flock_hash,
+ .hs_key = ldlm_export_flock_key,
+ .hs_keycmp = ldlm_export_flock_keycmp,
+ .hs_object = ldlm_export_flock_object,
+ .hs_get = ldlm_export_flock_get,
+ .hs_put = ldlm_export_flock_put,
+ .hs_put_locked = ldlm_export_flock_put,
+};
+
+int ldlm_init_flock_export(struct obd_export *exp)
+{
+ if( strcmp(exp->exp_obd->obd_type->typ_name, LUSTRE_MDT_NAME) != 0)
+ RETURN(0);
+
+ exp->exp_flock_hash =
+ cfs_hash_create(obd_uuid2str(&exp->exp_client_uuid),
+ HASH_EXP_LOCK_CUR_BITS,
+ HASH_EXP_LOCK_MAX_BITS,
+ HASH_EXP_LOCK_BKT_BITS, 0,
+ CFS_HASH_MIN_THETA, CFS_HASH_MAX_THETA,
+ &ldlm_export_flock_ops,
+ CFS_HASH_DEFAULT | CFS_HASH_NBLK_CHANGE);
+ if (!exp->exp_flock_hash)
+ RETURN(-ENOMEM);
+
+ RETURN(0);
+}
+
+void ldlm_destroy_flock_export(struct obd_export *exp)
+{
+ ENTRY;
+ if (exp->exp_flock_hash) {
+ cfs_hash_putref(exp->exp_flock_hash);
+ exp->exp_flock_hash = NULL;
+ }
+ EXIT;
+}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff