Viewing: ldlm_lockd.c
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2010, 2017, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
*
* Author: Peter Braam <braam@clusterfs.com>
* Author: Phil Schwan <phil@clusterfs.com>
*/
#define DEBUG_SUBSYSTEM S_LDLM
#include <linux/kthread.h>
#include <linux/list.h>
#include <lustre_errno.h>
#include <lustre_dlm.h>
#include <obd_class.h>
#include "ldlm_internal.h"
static int ldlm_num_threads;
module_param(ldlm_num_threads, int, 0444);
MODULE_PARM_DESC(ldlm_num_threads, "number of DLM service threads to start");
static unsigned int ldlm_cpu_bind = 1;
module_param(ldlm_cpu_bind, uint, 0444);
MODULE_PARM_DESC(ldlm_cpu_bind,
"bind DLM service threads to particular CPU partitions");
static char *ldlm_cpts;
module_param(ldlm_cpts, charp, 0444);
MODULE_PARM_DESC(ldlm_cpts, "CPU partitions ldlm threads should run on");
static DEFINE_MUTEX(ldlm_ref_mutex);
static int ldlm_refcount;
static struct kobject *ldlm_kobj;
struct kset *ldlm_ns_kset;
struct kset *ldlm_svc_kset;
/* LDLM state */
static struct ldlm_state *ldlm_state;
/*
* timeout for initial callback (AST) reply (bz10399)
* Due to having to send a 32 bit time value over the
* wire return it as timeout_t instead of time64_t
*/
static inline timeout_t ldlm_get_rq_timeout(void)
{
/* Non-AT value */
timeout_t timeout = min(ldlm_timeout, obd_timeout / 3);
return timeout < 1 ? 1 : timeout;
}
struct ldlm_bl_pool {
spinlock_t blp_lock;
/*
* blp_prio_list is used for callbacks that should be handled
* as a priority. It is used for LDLM_FL_DISCARD_DATA requests.
* see b=13843
*/
struct list_head blp_prio_list;
/*
* blp_list is used for all other callbacks which are likely
* to take longer to process.
*/
struct list_head blp_list;
wait_queue_head_t blp_waitq;
struct completion blp_comp;
atomic_t blp_num_threads;
atomic_t blp_busy_threads;
int blp_min_threads;
int blp_max_threads;
int blp_total_locks;
int blp_total_blwis;
};
struct ldlm_bl_work_item {
struct list_head blwi_entry;
struct ldlm_namespace *blwi_ns;
struct ldlm_lock_desc blwi_ld;
struct ldlm_lock *blwi_lock;
struct list_head blwi_head;
int blwi_count;
struct completion blwi_comp;
enum ldlm_cancel_flags blwi_flags;
int blwi_mem_pressure;
};
#ifdef CONFIG_LUSTRE_FS_SERVER
/**
* Protects both waiting_locks_list and expired_lock_thread.
*/
static DEFINE_SPINLOCK(waiting_locks_spinlock); /* BH lock (timer) */
/**
* List for contended locks.
*
* As soon as a lock is contended, it gets placed on this list and
* expected time to get a response is filled in the lock. A special
* thread walks the list looking for locks that should be released and
* schedules client evictions for those that have not been released in
* time.
*
* All access to it should be under waiting_locks_spinlock.
*/
static LIST_HEAD(waiting_locks_list);
static void waiting_locks_callback(struct timer_list *unused);
static DEFINE_TIMER(waiting_locks_timer, waiting_locks_callback);
enum elt_state {
ELT_STOPPED,
ELT_READY,
ELT_TERMINATE,
};
static DECLARE_WAIT_QUEUE_HEAD(expired_lock_wait_queue);
static enum elt_state expired_lock_thread_state = ELT_STOPPED;
static int expired_lock_dump;
static LIST_HEAD(expired_lock_list);
static int ldlm_lock_busy(struct ldlm_lock *lock);
static int ldlm_add_waiting_lock(struct ldlm_lock *lock, timeout_t timeout);
static int __ldlm_add_waiting_lock(struct ldlm_lock *lock, timeout_t timeout);
static inline int have_expired_locks(void)
{
int need_to_run;
ENTRY;
spin_lock_bh(&waiting_locks_spinlock);
need_to_run = !list_empty(&expired_lock_list);
spin_unlock_bh(&waiting_locks_spinlock);
RETURN(need_to_run);
}
/**
* Check expired lock list for expired locks and time them out.
*/
static int expired_lock_main(void *arg)
{
struct list_head *expired = &expired_lock_list;
struct lu_env env;
int rc, do_dump;
ENTRY;
rc = lu_env_init(&env, LCT_DT_THREAD | LCT_MD_THREAD);
if (rc)
RETURN(rc);
rc = lu_env_add(&env);
if (unlikely(rc))
GOTO(out_fini, rc);
expired_lock_thread_state = ELT_READY;
wake_up(&expired_lock_wait_queue);
while (1) {
wait_event_idle(expired_lock_wait_queue,
have_expired_locks() ||
expired_lock_thread_state == ELT_TERMINATE);
rc = lu_env_refill(&env);
if (unlikely(rc)) {
CERROR("can't refill env context: rc=%d\n", rc);
schedule_timeout(HZ * 3);
continue;
}
spin_lock_bh(&waiting_locks_spinlock);
if (expired_lock_dump) {
spin_unlock_bh(&waiting_locks_spinlock);
/* from waiting_locks_callback, but not in timer */
libcfs_debug_dumplog();
spin_lock_bh(&waiting_locks_spinlock);
expired_lock_dump = 0;
}
do_dump = 0;
while (!list_empty(expired)) {
struct obd_export *export;
struct ldlm_lock *lock;
lock = list_first_entry(expired, struct ldlm_lock,
l_pending_chain);
if ((void *)lock < LP_POISON + PAGE_SIZE &&
(void *)lock >= LP_POISON) {
spin_unlock_bh(&waiting_locks_spinlock);
CERROR("free lock on elt list %p\n", lock);
LBUG();
}
list_del_init(&lock->l_pending_chain);
if ((void *)lock->l_export <
LP_POISON + PAGE_SIZE &&
(void *)lock->l_export >= LP_POISON) {
CERROR("lock with free export on elt list %p\n",
lock->l_export);
lock->l_export = NULL;
LDLM_ERROR(lock, "free export");
/*
* release extra ref grabbed by
* ldlm_add_waiting_lock() or
* ldlm_failed_ast()
*/
ldlm_lock_put(lock);
continue;
}
if (ldlm_is_destroyed(lock)) {
/*
* release the lock refcount where
* waiting_locks_callback() founds
*/
ldlm_lock_put(lock);
continue;
}
export = class_export_lock_get(lock->l_export, lock);
spin_unlock_bh(&waiting_locks_spinlock);
/* Check if we need to prolong timeout */
if (!CFS_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT) &&
lock->l_callback_timestamp != 0 && /* not AST err */
ldlm_lock_busy(lock)) {
LDLM_DEBUG(lock, "prolong the busy lock");
lock_res_and_lock(lock);
ldlm_add_waiting_lock(lock,
ldlm_bl_timeout(lock) >> 1);
unlock_res_and_lock(lock);
} else {
spin_lock_bh(&export->exp_bl_list_lock);
list_del_init(&lock->l_exp_list);
spin_unlock_bh(&export->exp_bl_list_lock);
LDLM_ERROR(lock,
"lock callback timer expired after %llds: evicting client at %s ",
ktime_get_seconds() -
lock->l_blast_sent,
obd_export_nid2str(export));
ldlm_lock_to_ns(lock)->ns_timeouts++;
if (do_dump_on_eviction(export->exp_obd,
DUMP_LDLM_LOCK))
do_dump++;
class_fail_export(export);
}
class_export_lock_put(export, lock);
/*
* release extra ref grabbed by ldlm_add_waiting_lock()
* or ldlm_failed_ast()
*/
ldlm_lock_put(lock);
spin_lock_bh(&waiting_locks_spinlock);
}
spin_unlock_bh(&waiting_locks_spinlock);
if (do_dump) {
CERROR("dump the log upon eviction\n");
libcfs_debug_dumplog();
}
if (expired_lock_thread_state == ELT_TERMINATE)
break;
}
expired_lock_thread_state = ELT_STOPPED;
wake_up(&expired_lock_wait_queue);
rc = 0;
lu_env_remove(&env);
out_fini:
lu_env_fini(&env);
RETURN(rc);
}
/**
* Check if there is a request in the export request list
* which prevents the lock canceling.
*/
static int ldlm_lock_busy(struct ldlm_lock *lock)
{
struct ptlrpc_request *req;
int match = 0;
ENTRY;
if (lock->l_export == NULL)
return 0;
spin_lock(&lock->l_export->exp_rpc_lock);
list_for_each_entry(req, &lock->l_export->exp_hp_rpcs,
rq_exp_list) {
if (req->rq_ops->hpreq_lock_match) {
match = req->rq_ops->hpreq_lock_match(req, lock);
if (match)
break;
}
}
spin_unlock(&lock->l_export->exp_rpc_lock);
RETURN(match);
}
/* This is called from within a timer interrupt and cannot schedule */
static void waiting_locks_callback(struct timer_list *unused)
{
struct ldlm_lock *lock;
int need_dump = 0;
spin_lock_bh(&waiting_locks_spinlock);
while (!list_empty(&waiting_locks_list)) {
lock = list_first_entry(&waiting_locks_list, struct ldlm_lock,
l_pending_chain);
if (lock->l_callback_timestamp > ktime_get_seconds() ||
lock->l_req_mode == LCK_GROUP)
break;
/*
* no needs to take an extra ref on the lock since it was in
* the waiting_locks_list and ldlm_add_waiting_lock()
* already grabbed a ref
*/
list_move(&lock->l_pending_chain, &expired_lock_list);
need_dump = 1;
}
if (!list_empty(&expired_lock_list)) {
if (obd_dump_on_timeout && need_dump)
expired_lock_dump = __LINE__;
wake_up(&expired_lock_wait_queue);
}
/*
* Make sure the timer will fire again if we have any locks
* left.
*/
if (!list_empty(&waiting_locks_list)) {
time64_t now = ktime_get_seconds();
timeout_t delta = 0;
lock = list_first_entry(&waiting_locks_list, struct ldlm_lock,
l_pending_chain);
if (lock->l_callback_timestamp - now > 0)
delta = lock->l_callback_timestamp - now;
mod_timer(&waiting_locks_timer,
jiffies + cfs_time_seconds(delta));
}
spin_unlock_bh(&waiting_locks_spinlock);
}
/**
* Add lock to the list of contended locks.
*
* Indicate that we're waiting for a client to call us back cancelling a given
* lock. We add it to the pending-callback chain, and schedule the lock-timeout
* timer to fire appropriately. (We round up to the next second, to avoid
* floods of timer firings during periods of high lock contention and traffic).
* As done by ldlm_add_waiting_lock(), the caller must grab a lock reference
* if it has been added to the waiting list (1 is returned).
*
* Called with the namespace lock held.
*/
static int __ldlm_add_waiting_lock(struct ldlm_lock *lock, timeout_t delay)
{
unsigned long timeout_jiffies = jiffies;
time64_t deadline;
timeout_t timeout;
lock->l_blast_sent = ktime_get_seconds();
if (!list_empty(&lock->l_pending_chain))
return 0;
if (CFS_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT) ||
CFS_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT))
delay = 1;
deadline = lock->l_blast_sent + delay;
if (likely(deadline > lock->l_callback_timestamp))
lock->l_callback_timestamp = deadline;
timeout = clamp_t(timeout_t,
lock->l_callback_timestamp - lock->l_blast_sent,
0, delay);
timeout_jiffies += cfs_time_seconds(timeout);
if (time_before(timeout_jiffies, waiting_locks_timer.expires) ||
!timer_pending(&waiting_locks_timer))
mod_timer(&waiting_locks_timer, timeout_jiffies);
/*
* if the new lock has a shorter timeout than something earlier on
* the list, we'll wait the longer amount of time; no big deal.
*/
/* FIFO */
list_add_tail(&lock->l_pending_chain, &waiting_locks_list);
return 1;
}
static void ldlm_add_blocked_lock(struct ldlm_lock *lock)
{
spin_lock_bh(&lock->l_export->exp_bl_list_lock);
if (list_empty(&lock->l_exp_list)) {
if (!ldlm_is_granted(lock))
list_add_tail(&lock->l_exp_list,
&lock->l_export->exp_bl_list);
else
list_add(&lock->l_exp_list,
&lock->l_export->exp_bl_list);
}
spin_unlock_bh(&lock->l_export->exp_bl_list_lock);
/*
* A blocked lock is added. Adjust the position in
* the stale list if the export is in the list.
* If export is stale and not in the list - it is being
* processed and will be placed on the right position
* on obd_stale_export_put().
*/
if (!list_empty(&lock->l_export->exp_stale_list))
obd_stale_export_adjust(lock->l_export);
}
static int ldlm_add_waiting_lock(struct ldlm_lock *lock, timeout_t timeout)
{
struct obd_device *obd = NULL;
int at_off, ret;
/* NB: must be called with hold of lock_res_and_lock() */
LASSERT(ldlm_is_res_locked(lock));
LASSERT(!ldlm_is_cancel_on_block(lock));
/*
* Do not put cross-MDT lock in the waiting list, since we
* will not evict it due to timeout for now
*/
if (lock->l_export != NULL) {
obd = lock->l_export->exp_obd;
if (exp_connect_flags(lock->l_export) & OBD_CONNECT_MDS_MDS)
return 0;
}
spin_lock_bh(&waiting_locks_spinlock);
if (ldlm_is_cancel(lock)) {
spin_unlock_bh(&waiting_locks_spinlock);
return 0;
}
if (ldlm_is_destroyed(lock)) {
static time64_t next;
spin_unlock_bh(&waiting_locks_spinlock);
LDLM_ERROR(lock, "not waiting on destroyed lock (b=5653)");
if (ktime_get_seconds() > next) {
next = ktime_get_seconds() + 14400;
dump_stack();
}
return 0;
}
ldlm_set_waited(lock);
ret = __ldlm_add_waiting_lock(lock, timeout);
if (ret) {
/*
* grab ref on the lock if it has been added to the
* waiting list
*/
ldlm_lock_get(lock);
}
spin_unlock_bh(&waiting_locks_spinlock);
if (ret)
ldlm_add_blocked_lock(lock);
at_off = obd_at_off(obd);
LDLM_DEBUG(lock, "%sadding to wait list(timeout: %d, AT: %s)",
ret == 0 ? "not re-" : "", timeout,
at_off ? "off" : "on");
return ret;
}
/**
* Remove a lock from the pending list, likely because it had its cancellation
* callback arrive without incident. This adjusts the lock-timeout timer if
* needed. Returns 0 if the lock wasn't pending after all, 1 if it was.
* As done by ldlm_del_waiting_lock(), the caller must release the lock
* reference when the lock is removed from any list (1 is returned).
*
* Called with namespace lock held.
*/
static int __ldlm_del_waiting_lock(struct ldlm_lock *lock)
{
struct list_head *list_next;
if (list_empty(&lock->l_pending_chain))
return 0;
list_next = lock->l_pending_chain.next;
if (lock->l_pending_chain.prev == &waiting_locks_list) {
/* Removing the head of the list, adjust timer. */
if (list_next == &waiting_locks_list) {
/* No more, just cancel. */
timer_delete(&waiting_locks_timer);
} else {
time64_t now = ktime_get_seconds();
struct ldlm_lock *next;
timeout_t delta = 0;
next = list_entry(list_next, struct ldlm_lock,
l_pending_chain);
if (next->l_callback_timestamp - now > 0)
delta = next->l_callback_timestamp - now;
mod_timer(&waiting_locks_timer,
jiffies + cfs_time_seconds(delta));
}
}
list_del_init(&lock->l_pending_chain);
return 1;
}
int ldlm_del_waiting_lock(struct ldlm_lock *lock)
{
int ret;
if (lock->l_export == NULL) {
/* We don't have a "waiting locks list" on clients. */
CDEBUG(D_DLMTRACE, "Client lock %p : no-op\n", lock);
return 0;
}
spin_lock_bh(&waiting_locks_spinlock);
ret = __ldlm_del_waiting_lock(lock);
ldlm_clear_waited(lock);
spin_unlock_bh(&waiting_locks_spinlock);
/* remove the lock out of export blocking list */
spin_lock_bh(&lock->l_export->exp_bl_list_lock);
list_del_init(&lock->l_exp_list);
spin_unlock_bh(&lock->l_export->exp_bl_list_lock);
if (ret) {
/*
* release lock ref if it has indeed been removed
* from a list
*/
ldlm_lock_put(lock);
}
LDLM_DEBUG(lock, "%s", ret == 0 ? "wasn't waiting" : "removed");
return ret;
}
/**
* Prolong the contended lock waiting time.
*
* Called with namespace lock held.
*/
int ldlm_refresh_waiting_lock(struct ldlm_lock *lock, timeout_t timeout)
{
if (lock->l_export == NULL) {
/* We don't have a "waiting locks list" on clients. */
LDLM_DEBUG(lock, "client lock: no-op");
return 0;
}
if (exp_connect_flags(lock->l_export) & OBD_CONNECT_MDS_MDS) {
/* We don't have a "waiting locks list" on OSP. */
LDLM_DEBUG(lock, "MDS-MDS lock: no-op");
return 0;
}
spin_lock_bh(&waiting_locks_spinlock);
if (list_empty(&lock->l_pending_chain)) {
spin_unlock_bh(&waiting_locks_spinlock);
LDLM_DEBUG(lock, "wasn't waiting");
return 0;
}
/*
* we remove/add the lock to the waiting list, so no needs to
* release/take a lock reference
*/
__ldlm_del_waiting_lock(lock);
__ldlm_add_waiting_lock(lock, timeout);
spin_unlock_bh(&waiting_locks_spinlock);
LDLM_DEBUG(lock, "refreshed to %ds", timeout);
return 1;
}
EXPORT_SYMBOL(ldlm_refresh_waiting_lock);
#else /* CONFIG_LUSTRE_FS_SERVER */
int ldlm_del_waiting_lock(struct ldlm_lock *lock)
{
RETURN(0);
}
int ldlm_refresh_waiting_lock(struct ldlm_lock *lock, timeout_t timeout)
{
RETURN(0);
}
#endif /* !CONFIG_LUSTRE_FS_SERVER */
#ifdef CONFIG_LUSTRE_FS_SERVER
/**
* Calculate the per-export Blocking timeout (covering BL AST, data flush,
* lock cancel, and their replies). Used for lock callback timeout and AST
* re-send period.
*
* \param[in] lock lock which is getting the blocking callback
*
* \retval timeout in seconds to wait for the client reply
*/
timeout_t ldlm_bl_timeout(struct ldlm_lock *lock)
{
timeout_t timeout;
struct obd_device *obd = lock->l_export->exp_obd;
if (obd_at_off(obd))
return obd_timeout / 2;
/*
* Since these are non-updating timeouts, we should be conservative.
* Take more than usually, 150%
* It would be nice to have some kind of "early reply" mechanism for
* lock callbacks too...
*/
timeout = obd_at_get(obd, &lock->l_export->exp_bl_lock_at);
return max_t(timeout_t, timeout + (timeout >> 1),
(timeout_t)obd_get_ldlm_enqueue_min(obd));
}
EXPORT_SYMBOL(ldlm_bl_timeout);
/**
* Perform lock cleanup if AST sending failed.
*/
static void ldlm_failed_ast(struct ldlm_lock *lock, int rc,
const char *ast_type)
{
LCONSOLE_ERROR("%s: A client on nid %s was evicted due to a lock %s callback time out: rc %d\n",
lock->l_export->exp_obd->obd_name,
obd_export_nid2str(lock->l_export), ast_type, rc);
if (obd_dump_on_timeout)
libcfs_debug_dumplog();
spin_lock_bh(&waiting_locks_spinlock);
if (__ldlm_del_waiting_lock(lock) == 0)
/*
* the lock was not in any list, grab an extra ref before adding
* the lock to the expired list
*/
ldlm_lock_get(lock);
/* differentiate it from expired locks */
lock->l_callback_timestamp = 0;
list_add(&lock->l_pending_chain, &expired_lock_list);
wake_up(&expired_lock_wait_queue);
spin_unlock_bh(&waiting_locks_spinlock);
}
/**
* Perform lock cleanup if AST reply came with error.
*/
static int ldlm_handle_ast_error(struct ldlm_lock *lock,
struct ptlrpc_request *req, int rc,
const char *ast_type)
{
struct lnet_processid *peer = &req->rq_import->imp_connection->c_peer;
if (!req->rq_replied || (rc && rc != -EINVAL)) {
if (ldlm_is_cancel(lock)) {
LDLM_DEBUG(lock,
"%s AST (req@%p x%llu) timeout from nid %s, but cancel was received (AST reply lost?)",
ast_type, req, req->rq_xid,
libcfs_nidstr(&peer->nid));
ldlm_lock_cancel(lock);
rc = -ERESTART;
} else if (rc == -ENODEV || rc == -ESHUTDOWN ||
(rc == -EIO &&
req->rq_import->imp_state == LUSTRE_IMP_CLOSED)) {
/*
* Upon umount process the AST fails because cannot be
* sent. This shouldn't lead to the client eviction.
* -ENODEV error is returned by ptl_send_rpc() for
* new request in such import.
* -SHUTDOWN is returned by ptlrpc_import_delay_req()
* if imp_invalid is set or OBDF_NO_RECOV.
* Meanwhile there is also check for LUSTRE_IMP_CLOSED
* in ptlrpc_import_delay_req() as well with -EIO code.
* In all such cases errors are ignored.
*/
LDLM_DEBUG(lock,
"%s AST can't be sent due to a server %s failure or umount process: rc = %d",
ast_type,
req->rq_import->imp_obd->obd_name, rc);
} else {
LDLM_ERROR(lock,
"client (nid %s) %s %s AST (req@%p x%llu status %d rc %d), evict it",
libcfs_nidstr(&peer->nid),
req->rq_replied ? "returned error from" :
"failed to reply to",
ast_type, req, req->rq_xid,
(req->rq_repmsg != NULL) ?
lustre_msg_get_status(req->rq_repmsg) : 0,
rc);
ldlm_failed_ast(lock, rc, ast_type);
}
return rc;
}
if (rc == -EINVAL) {
struct ldlm_resource *res = lock->l_resource;
LDLM_DEBUG(lock,
"client (nid %s) returned %d from %s AST (req@%p x%llu) - normal race",
libcfs_nidstr(&peer->nid),
req->rq_repmsg ?
lustre_msg_get_status(req->rq_repmsg) : -1,
ast_type, req, req->rq_xid);
if (res) {
/*
* update lvbo to return proper attributes.
* see b=23174
*/
ldlm_resource_getref(res);
ldlm_lvbo_update(res, lock, NULL, 1);
ldlm_resource_putref(res);
}
ldlm_lock_cancel(lock);
rc = -ERESTART;
}
return rc;
}
static int ldlm_cb_interpret(const struct lu_env *env,
struct ptlrpc_request *req, void *args, int rc)
{
struct ldlm_cb_async_args *ca = args;
struct ldlm_lock *lock = ca->ca_lock;
struct ldlm_cb_set_arg *arg = ca->ca_set_arg;
ENTRY;
LASSERT(lock != NULL);
switch (arg->type) {
case LDLM_GL_CALLBACK:
/*
* Update the LVB from disk if the AST failed
* (this is a legal race)
*
* - Glimpse callback of local lock just returns
* -ELDLM_NO_LOCK_DATA.
* - Glimpse callback of remote lock might return
* -ELDLM_NO_LOCK_DATA when inode is cleared. LU-274
*/
if (unlikely(arg->gl_interpret_reply)) {
rc = arg->gl_interpret_reply(NULL, req, args, rc);
} else if (rc == -ELDLM_NO_LOCK_DATA) {
LDLM_DEBUG(lock,
"lost race - client has a lock but no inode");
ldlm_lvbo_update(lock->l_resource, lock, NULL, 1);
} else if (rc != 0) {
rc = ldlm_handle_ast_error(lock, req, rc, "glimpse");
} else {
rc = ldlm_lvbo_update(lock->l_resource,
lock, req, 1);
}
break;
case LDLM_BL_CALLBACK:
if (rc != 0)
rc = ldlm_handle_ast_error(lock, req, rc, "blocking");
break;
case LDLM_CP_CALLBACK:
if (rc != 0)
rc = ldlm_handle_ast_error(lock, req, rc, "completion");
break;
default:
LDLM_ERROR(lock, "invalid opcode for lock callback %d",
arg->type);
LBUG();
}
/* release extra reference taken in ldlm_ast_fini() */
ldlm_lock_put(lock);
if (rc == -ERESTART)
atomic_inc(&arg->restart);
RETURN(0);
}
static void ldlm_update_resend(struct ptlrpc_request *req, void *data)
{
struct ldlm_cb_async_args *ca = data;
struct ldlm_lock *lock = ca->ca_lock;
ldlm_refresh_waiting_lock(lock, ldlm_bl_timeout(lock));
}
static inline int ldlm_ast_fini(struct ptlrpc_request *req,
struct ldlm_cb_set_arg *arg,
struct ldlm_lock *lock,
int instant_cancel)
{
int rc = 0;
ENTRY;
if (unlikely(instant_cancel)) {
rc = ptl_send_rpc(req, 1);
ptlrpc_req_put(req);
if (rc == 0)
atomic_inc(&arg->restart);
} else {
ldlm_lock_get(lock);
ptlrpc_set_add_req(arg->set, req);
}
RETURN(rc);
}
/**
* Check if there are requests in the export request list which prevent
* the lock canceling and make these requests high priority ones.
*/
static void ldlm_lock_reorder_req(struct ldlm_lock *lock)
{
struct ptlrpc_request *req;
ENTRY;
if (lock->l_export == NULL) {
LDLM_DEBUG(lock, "client lock: no-op");
RETURN_EXIT;
}
spin_lock(&lock->l_export->exp_rpc_lock);
list_for_each_entry(req, &lock->l_export->exp_hp_rpcs,
rq_exp_list) {
/*
* Do not process requests that were not yet added to there
* incoming queue or were already removed from there for
* processing. We evaluate ptlrpc_nrs_req_can_move() without
* holding svcpt->scp_req_lock, and then redo the check with
* the lock held once we need to obtain a reliable result.
*/
if (ptlrpc_nrs_req_can_move(req) &&
req->rq_ops->hpreq_lock_match &&
req->rq_ops->hpreq_lock_match(req, lock))
ptlrpc_nrs_req_hp_move(req);
}
spin_unlock(&lock->l_export->exp_rpc_lock);
EXIT;
}
/**
* ->l_blocking_ast() method for server-side locks. This is invoked when newly
* enqueued server lock conflicts with given one.
*
* Sends blocking AST RPC to the client owning that lock; arms timeout timer
* to wait for client response.
*/
int ldlm_server_blocking_ast(struct ldlm_lock *lock,
struct ldlm_lock_desc *desc,
void *data, int flag)
{
struct ldlm_cb_async_args *ca;
struct ldlm_cb_set_arg *arg = data;
struct ldlm_request *body;
struct ptlrpc_request *req;
int instant_cancel = 0;
int rc = 0;
struct obd_device *obd;
ENTRY;
if (flag == LDLM_CB_CANCELING)
/* Don't need to do anything here. */
RETURN(0);
if (CFS_FAIL_PRECHECK(OBD_FAIL_LDLM_SRV_BL_AST)) {
LDLM_DEBUG(lock, "dropping BL AST");
RETURN(0);
}
LASSERT(lock);
LASSERT(data != NULL);
obd = lock->l_export->exp_obd;
if (test_bit(OBDF_RECOVERING, obd->obd_flags))
LDLM_ERROR(lock, "BUG 6063: lock collide during recovery");
ldlm_lock_reorder_req(lock);
req = ptlrpc_request_alloc_pack(lock->l_export->exp_imp_reverse,
&RQF_LDLM_BL_CALLBACK,
LUSTRE_DLM_VERSION, LDLM_BL_CALLBACK);
if (IS_ERR(req))
RETURN(PTR_ERR(req));
ca = ptlrpc_req_async_args(ca, req);
ca->ca_set_arg = arg;
ca->ca_lock = lock;
req->rq_interpret_reply = ldlm_cb_interpret;
lock_res_and_lock(lock);
if (ldlm_is_destroyed(lock)) {
/* What's the point? */
unlock_res_and_lock(lock);
ptlrpc_req_put(req);
RETURN(0);
}
if (!ldlm_is_granted(lock)) {
/*
* this blocking AST will be communicated as part of the
* completion AST instead
*/
ldlm_add_blocked_lock(lock);
ldlm_set_waited(lock);
unlock_res_and_lock(lock);
ptlrpc_req_put(req);
LDLM_DEBUG(lock, "lock not granted, not sending blocking AST");
RETURN(0);
}
if (ldlm_is_cancel_on_block(lock))
instant_cancel = 1;
body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
body->lock_handle[0] = lock->l_remote_handle;
body->lock_handle[1].cookie = lock->l_handle.h_cookie;
body->lock_desc = *desc;
body->lock_flags |= ldlm_flags_to_wire(lock->l_flags &
LDLM_FL_AST_MASK);
LDLM_DEBUG(lock, "server preparing blocking AST");
ptlrpc_request_set_replen(req);
ldlm_set_cbpending(lock);
if (instant_cancel) {
unlock_res_and_lock(lock);
ldlm_lock_cancel(lock);
req->rq_no_resend = 1;
} else {
LASSERT(ldlm_is_granted(lock));
ldlm_add_waiting_lock(lock, ldlm_bl_timeout(lock));
unlock_res_and_lock(lock);
/* Do not resend after lock callback timeout */
req->rq_delay_limit_ns = ktime_set(ldlm_bl_timeout(lock), 0);
req->rq_resend_cb = ldlm_update_resend;
}
req->rq_send_state = LUSTRE_IMP_FULL;
/* ptlrpc_request_alloc_pack already set timeout */
if (obd_at_off(obd))
req->rq_timeout = ldlm_get_rq_timeout();
if (lock->l_export && lock->l_export->exp_nid_stats &&
lock->l_export->exp_nid_stats->nid_ldlm_stats)
lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
LDLM_BL_CALLBACK - LDLM_FIRST_OPC);
rc = ldlm_ast_fini(req, arg, lock, instant_cancel);
RETURN(rc);
}
/**
* ->l_completion_ast callback for a remote lock in server namespace.
*
* Sends AST to the client notifying it of lock granting. If initial
* lock response was not sent yet, instead of sending another RPC, just
* mark the lock as granted and client will understand
*/
int ldlm_server_completion_ast(struct ldlm_lock *lock, __u64 flags, void *data)
{
struct ldlm_cb_set_arg *arg = data;
struct ldlm_request *body;
struct ptlrpc_request *req;
struct ldlm_cb_async_args *ca;
int instant_cancel = 0;
int rc = 0;
int lvb_len;
struct obd_device *obd;
ENTRY;
LASSERT(lock != NULL);
LASSERT(data != NULL);
if (CFS_FAIL_PRECHECK(OBD_FAIL_LDLM_SRV_CP_AST)) {
LDLM_DEBUG(lock, "dropping CP AST");
RETURN(0);
}
obd = lock->l_export->exp_obd;
req = ptlrpc_request_alloc(lock->l_export->exp_imp_reverse,
&RQF_LDLM_CP_CALLBACK);
if (req == NULL)
RETURN(-ENOMEM);
/* server namespace, doesn't need lock */
lvb_len = ldlm_lvbo_size(lock);
/*
* LU-3124 & LU-2187: to not return layout in completion AST because
* it may deadlock for LU-2187, or client may not have enough space
* for large layout. The layout will be returned to client with an
* extra RPC to fetch xattr.lov
*/
if (ldlm_has_layout(lock))
lvb_len = 0;
req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_CLIENT, lvb_len);
rc = ptlrpc_request_pack(req, LUSTRE_DLM_VERSION, LDLM_CP_CALLBACK);
if (rc) {
ptlrpc_request_free(req);
RETURN(rc);
}
ca = ptlrpc_req_async_args(ca, req);
ca->ca_set_arg = arg;
ca->ca_lock = lock;
req->rq_interpret_reply = ldlm_cb_interpret;
body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
body->lock_handle[0] = lock->l_remote_handle;
body->lock_handle[1].cookie = lock->l_handle.h_cookie;
body->lock_flags = ldlm_flags_to_wire(flags);
ldlm_lock2desc(lock, &body->lock_desc);
if (lvb_len > 0) {
void *lvb = req_capsule_client_get(&req->rq_pill, &RMF_DLM_LVB);
lvb_len = ldlm_lvbo_fill(lock, lvb, &lvb_len);
if (lvb_len < 0) {
/*
* We still need to send the RPC to wake up the blocked
* enqueue thread on the client.
*
* Consider old client, there is no better way to notify
* the failure, just zero-sized the LVB, then the client
* will fail out as "-EPROTO".
*/
req_capsule_shrink(&req->rq_pill, &RMF_DLM_LVB, 0,
RCL_CLIENT);
instant_cancel = 1;
} else {
req_capsule_shrink(&req->rq_pill, &RMF_DLM_LVB, lvb_len,
RCL_CLIENT);
}
}
LDLM_DEBUG(lock, "server preparing completion AST");
ptlrpc_request_set_replen(req);
req->rq_send_state = LUSTRE_IMP_FULL;
/* ptlrpc_request_pack already set timeout */
if (obd_at_off(obd))
req->rq_timeout = ldlm_get_rq_timeout();
/* We only send real blocking ASTs after the lock is granted */
lock_res_and_lock(lock);
if (ldlm_is_ast_sent(lock)) {
body->lock_flags |= ldlm_flags_to_wire(LDLM_FL_AST_SENT);
/* Copy AST flags like LDLM_FL_DISCARD_DATA. */
body->lock_flags |= ldlm_flags_to_wire(lock->l_flags &
LDLM_FL_AST_MASK);
/*
* We might get here prior to ldlm_handle_enqueue setting
* LDLM_FL_CANCEL_ON_BLOCK flag. Then we will put this lock
* into waiting list, but this is safe and similar code in
* ldlm_handle_enqueue will call ldlm_lock_cancel() still,
* that would not only cancel the lock, but will also remove
* it from waiting list
*/
if (ldlm_is_cancel_on_block(lock)) {
unlock_res_and_lock(lock);
ldlm_lock_cancel(lock);
instant_cancel = 1;
req->rq_no_resend = 1;
lock_res_and_lock(lock);
} else {
u64 timeout = ldlm_bl_timeout(lock);
/* start the lock-timeout clock */
ldlm_add_waiting_lock(lock, ldlm_bl_timeout(lock));
/* Do not resend after lock callback timeout */
req->rq_delay_limit_ns = ktime_set(timeout, 0);
req->rq_resend_cb = ldlm_update_resend;
}
}
unlock_res_and_lock(lock);
if (lock->l_export && lock->l_export->exp_nid_stats &&
lock->l_export->exp_nid_stats->nid_ldlm_stats)
lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats,
LDLM_CP_CALLBACK - LDLM_FIRST_OPC);
rc = ldlm_ast_fini(req, arg, lock, instant_cancel);
RETURN(lvb_len < 0 ? lvb_len : rc);
}
EXPORT_SYMBOL(ldlm_server_completion_ast);
/**
* Server side ->l_glimpse_ast handler for client locks.
*
* Sends glimpse AST to the client and waits for reply. Then updates
* lvbo with the result.
*/
int ldlm_server_glimpse_ast(struct ldlm_lock *lock, void *data)
{
struct ldlm_cb_set_arg *arg = data;
struct ldlm_request *body;
struct ptlrpc_request *req;
struct ldlm_cb_async_args *ca;
int rc;
struct req_format *req_fmt;
struct obd_device *obd = lock->l_export->exp_obd;
ENTRY;
LASSERT(lock != NULL);
if (arg->gl_desc != NULL)
/* There is a glimpse descriptor to pack */
req_fmt = &RQF_LDLM_GL_CALLBACK_DESC;
else
req_fmt = &RQF_LDLM_GL_CALLBACK;
req = ptlrpc_request_alloc_pack(lock->l_export->exp_imp_reverse,
req_fmt, LUSTRE_DLM_VERSION,
LDLM_GL_CALLBACK);
if (IS_ERR(req))
RETURN(PTR_ERR(req));
if (arg->gl_desc != NULL) {
/* copy the GL descriptor */
union ldlm_gl_desc *desc;
desc = req_capsule_client_get(&req->rq_pill, &RMF_DLM_GL_DESC);
*desc = *arg->gl_desc;
}
body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
body->lock_handle[0] = lock->l_remote_handle;
ldlm_lock2desc(lock, &body->lock_desc);
ca = ptlrpc_req_async_args(ca, req);
ca->ca_set_arg = arg;
ca->ca_lock = lock;
/* server namespace, doesn't need lock */
req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
ldlm_lvbo_size(lock));
ptlrpc_request_set_replen(req);
req->rq_send_state = LUSTRE_IMP_FULL;
/* ptlrpc_request_alloc_pack already set timeout */
if (obd_at_off(obd))
req->rq_timeout = ldlm_get_rq_timeout();
req->rq_interpret_reply = ldlm_cb_interpret;
if (lock->l_export && lock->l_export->exp_nid_stats) {
struct nid_stat *nid_stats = lock->l_export->exp_nid_stats;
lprocfs_counter_incr(nid_stats->nid_ldlm_stats,
LDLM_GL_CALLBACK - LDLM_FIRST_OPC);
}
rc = ldlm_ast_fini(req, arg, lock, 0);
RETURN(rc);
}
EXPORT_SYMBOL(ldlm_server_glimpse_ast);
int ldlm_glimpse_locks(struct ldlm_resource *res,
struct list_head *gl_work_list)
{
int rc;
ENTRY;
rc = ldlm_run_ast_work(ldlm_res_to_ns(res), gl_work_list,
LDLM_WORK_GL_AST);
if (rc == -ERESTART)
ldlm_reprocess_all(res, 0);
RETURN(rc);
}
EXPORT_SYMBOL(ldlm_glimpse_locks);
/* return LDLM lock associated with a lock callback request */
struct ldlm_lock *ldlm_request_lock(struct ptlrpc_request *req)
{
struct ldlm_cb_async_args *ca;
struct ldlm_lock *lock;
ENTRY;
ca = ptlrpc_req_async_args(ca, req);
lock = ca->ca_lock;
if (lock == NULL)
RETURN(ERR_PTR(-EFAULT));
RETURN(lock);
}
EXPORT_SYMBOL(ldlm_request_lock);
/**
* Main server-side entry point into LDLM for enqueue. This is called by ptlrpc
* service threads to carry out client lock enqueueing requests.
*/
int ldlm_handle_enqueue(struct ldlm_namespace *ns,
struct req_capsule *pill,
const struct ldlm_request *dlm_req,
const struct ldlm_callback_suite *cbs)
{
struct ldlm_reply *dlm_rep;
__u64 flags;
enum ldlm_error err = ELDLM_OK;
struct ldlm_lock *lock = NULL;
void *cookie = NULL;
int rc = 0;
struct ldlm_resource *res = NULL;
struct ptlrpc_request *req = pill->rc_req;
const struct lu_env *env = req->rq_svc_thread->t_env;
ENTRY;
LDLM_DEBUG_NOLOCK("server-side enqueue handler START");
LASSERT(req && req->rq_export);
if (req_capsule_ptlreq(pill))
ldlm_request_cancel(req, dlm_req, LDLM_ENQUEUE_CANCEL_OFF,
LATF_SKIP);
flags = ldlm_flags_from_wire(dlm_req->lock_flags);
if (flags & ~LDLM_FL_WIRE_REQ_FLAGS_MASK) {
DEBUG_REQ(D_ERROR, req, "invalid lock request flags %llx",
flags & ~LDLM_FL_WIRE_REQ_FLAGS_MASK);
GOTO(out, rc = -EPROTO);
}
/* for intent enqueue the stat will be updated inside intent policy */
if (ptlrpc_req2svc(req)->srv_stats != NULL &&
!(dlm_req->lock_flags & LDLM_FL_HAS_INTENT))
ldlm_svc_get_eopc(dlm_req, ptlrpc_req2svc(req)->srv_stats);
if (req->rq_export->exp_nid_stats &&
req->rq_export->exp_nid_stats->nid_ldlm_stats)
lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
LDLM_ENQUEUE - LDLM_FIRST_OPC);
if (unlikely(dlm_req->lock_desc.l_resource.lr_type < LDLM_TYPE_MIN ||
dlm_req->lock_desc.l_resource.lr_type >= LDLM_TYPE_END)) {
DEBUG_REQ(D_ERROR, req, "invalid lock request type %d",
dlm_req->lock_desc.l_resource.lr_type);
GOTO(out, rc = -EFAULT);
}
if (unlikely(dlm_req->lock_desc.l_req_mode <= LCK_MODE_MIN ||
dlm_req->lock_desc.l_req_mode >= LCK_MODE_END ||
dlm_req->lock_desc.l_req_mode &
(dlm_req->lock_desc.l_req_mode-1))) {
DEBUG_REQ(D_ERROR, req, "invalid lock request mode %d",
dlm_req->lock_desc.l_req_mode);
GOTO(out, rc = -EFAULT);
}
if (unlikely((flags & LDLM_FL_REPLAY) ||
(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT))) {
/* Find an existing lock in the per-export lock hash */
/*
* In the function below, .hs_keycmp resolves to
* ldlm_export_lock_keycmp()
*/
lock = cfs_hash_lookup(req->rq_export->exp_lock_hash,
(void *)&dlm_req->lock_handle[0]);
if (lock != NULL) {
DEBUG_REQ(D_DLMTRACE, req,
"found existing lock cookie %#llx",
lock->l_handle.h_cookie);
flags |= LDLM_FL_RESENT;
GOTO(existing_lock, rc = 0);
}
} else {
if (ldlm_reclaim_full()) {
DEBUG_REQ(D_WARNING | D_RPCTRACE, req,
"Too many granted locks, reject current enqueue request and let the client retry later");
GOTO(out, rc = -EINPROGRESS);
}
}
/* The lock's callback data might be set in the policy function */
lock = ldlm_lock_create(ns, &dlm_req->lock_desc.l_resource.lr_name,
dlm_req->lock_desc.l_resource.lr_type,
dlm_req->lock_desc.l_req_mode,
cbs, NULL, 0, LVB_T_NONE);
if (IS_ERR(lock)) {
rc = PTR_ERR(lock);
lock = NULL;
GOTO(out, rc);
}
lock->l_remote_handle = dlm_req->lock_handle[0];
LDLM_DEBUG(lock, "server-side enqueue handler, new lock created");
/*
* Initialize resource lvb but not for a lock being replayed since
* Client already got lvb sent in this case.
* This must occur early since some policy methods assume resource
* lvb is available (lr_lvb_data != NULL).
*/
res = lock->l_resource;
if (!(flags & LDLM_FL_REPLAY)) {
/* non-replayed lock, delayed lvb init may need to be done */
rc = ldlm_lvbo_init(res);
if (rc < 0) {
LDLM_DEBUG(lock, "delayed lvb init failed (rc %d)", rc);
GOTO(out, rc);
}
}
CFS_FAIL_TIMEOUT(OBD_FAIL_LDLM_ENQUEUE_BLOCKED, obd_timeout * 2);
/*
* Don't enqueue a lock onto the export if it is been disonnected
* due to eviction (b=3822) or server umount (b=24324).
* Cancel it now instead.
*/
if (req->rq_export->exp_disconnected) {
LDLM_ERROR(lock, "lock on disconnected export %p",
req->rq_export);
GOTO(out, rc = -ENOTCONN);
}
lock->l_export = class_export_lock_get(req->rq_export, lock);
if (lock->l_export->exp_lock_hash)
cfs_hash_add(lock->l_export->exp_lock_hash,
&lock->l_remote_handle,
&lock->l_exp_hash);
/*
* Inherit the enqueue flags before the operation, because we do not
* keep the res lock on return and next operations (BL AST) may proceed
* without them.
*/
lock->l_flags |= ldlm_flags_from_wire(dlm_req->lock_flags &
LDLM_FL_INHERIT_MASK);
ldlm_convert_policy_to_local(req->rq_export,
dlm_req->lock_desc.l_resource.lr_type,
&dlm_req->lock_desc.l_policy_data,
&lock->l_policy_data);
if (dlm_req->lock_desc.l_resource.lr_type == LDLM_EXTENT) {
lock->l_req_extent = lock->l_policy_data.l_extent;
} else if (dlm_req->lock_desc.l_resource.lr_type == LDLM_IBITS) {
lock->l_policy_data.l_inodebits.try_bits =
dlm_req->lock_desc.l_policy_data.l_inodebits.try_bits;
lock->l_policy_data.l_inodebits.li_gid =
dlm_req->lock_desc.l_policy_data.l_inodebits.li_gid;
}
existing_lock:
cookie = req;
if (!(flags & LDLM_FL_HAS_INTENT)) {
/* based on the assumption that lvb size never changes during
* resource life time otherwise it need resource->lr_lock's
* protection
*/
req_capsule_set_size(pill, &RMF_DLM_LVB,
RCL_SERVER, ldlm_lvbo_size(lock));
if (CFS_FAIL_CHECK(OBD_FAIL_LDLM_ENQUEUE_EXTENT_ERR))
GOTO(out, rc = -ENOMEM);
rc = req_capsule_server_pack(pill);
if (rc)
GOTO(out, rc);
}
err = ldlm_lock_enqueue(env, ns, &lock, cookie, &flags);
if (err) {
if ((int)err < 0)
rc = (int)err;
GOTO(out, err);
}
dlm_rep = req_capsule_server_get(pill, &RMF_DLM_REP);
ldlm_lock2desc(lock, &dlm_rep->lock_desc);
ldlm_lock2handle(lock, &dlm_rep->lock_handle);
if (lock->l_resource->lr_type == LDLM_EXTENT)
CFS_FAIL_TIMEOUT(OBD_FAIL_LDLM_BL_EVICT, 6);
/*
* We never send a blocking AST until the lock is granted, but
* we can tell it right now
*/
lock_res_and_lock(lock);
/*
* Now take into account flags to be inherited from original lock
* request both in reply to client and in our own lock flags.
*/
dlm_rep->lock_flags = ldlm_flags_to_wire(flags);
lock->l_flags |= flags & LDLM_FL_INHERIT_MASK;
/*
* Don't move a pending lock onto the export if it has already been
* disconnected due to eviction (b=5683) or server umount (b=24324).
* Cancel it now instead.
*/
if (unlikely(req->rq_export->exp_disconnected ||
CFS_FAIL_CHECK(OBD_FAIL_LDLM_ENQUEUE_OLD_EXPORT))) {
LDLM_ERROR(lock, "lock on destroyed export %p", req->rq_export);
rc = -ENOTCONN;
} else if (ldlm_is_ast_sent(lock)) {
/* fill lock desc for possible lock convert */
if (lock->l_blocking_lock &&
lock->l_resource->lr_type == LDLM_IBITS) {
struct ldlm_lock *bl_lock = lock->l_blocking_lock;
struct ldlm_lock_desc *rep_desc = &dlm_rep->lock_desc;
LDLM_DEBUG(lock,
"save blocking bits %lx in granted lock",
bl_lock->l_policy_data.l_inodebits.bits);
/*
* If lock is blocked then save blocking ibits
* in returned lock policy for the possible lock
* convert on a client.
*/
rep_desc->l_policy_data.l_inodebits.cancel_bits =
bl_lock->l_policy_data.l_inodebits.bits;
}
dlm_rep->lock_flags |= ldlm_flags_to_wire(LDLM_FL_AST_SENT);
if (ldlm_is_granted(lock)) {
/*
* Only cancel lock if it was granted, because it would
* be destroyed immediately and would never be granted
* in the future, causing timeouts on client. Not
* granted lock will be cancelled immediately after
* sending completion AST.
*/
if (ldlm_is_cancel_on_block(lock)) {
unlock_res_and_lock(lock);
ldlm_lock_cancel(lock);
lock_res_and_lock(lock);
} else {
ldlm_add_waiting_lock(lock,
ldlm_bl_timeout(lock));
}
}
}
unlock_res_and_lock(lock);
EXIT;
out:
if (req_capsule_ptlreq(pill)) {
req->rq_status = rc ?: err; /* return either error - b=11190 */
if (!req->rq_packed_final) {
int rc1 = lustre_pack_reply(req, 1, NULL, NULL);
if (rc == 0)
rc = rc1;
}
}
/*
* The LOCK_CHANGED code in ldlm_lock_enqueue depends on this
* ldlm_reprocess_all. If this moves, revisit that code. -phil
*/
if (lock != NULL) {
LDLM_DEBUG(lock,
"server-side enqueue handler, sending reply (err=%d, rc=%d)",
err, rc);
if (rc == 0 &&
req_capsule_has_field(pill, &RMF_DLM_LVB,
RCL_SERVER) &&
ldlm_lvbo_size(lock) > 0) {
void *buf;
int buflen;
retry:
buf = req_capsule_server_get(pill, &RMF_DLM_LVB);
LASSERTF(buf != NULL, "req %px, lock %px\n", req, lock);
buflen = req_capsule_get_size(pill, &RMF_DLM_LVB,
RCL_SERVER);
/*
* non-replayed lock, delayed lvb init may
* need to be occur now
*/
if ((buflen > 0) && !(flags & LDLM_FL_REPLAY)) {
int rc2;
rc2 = ldlm_lvbo_fill(lock, buf, &buflen);
if (rc2 >= 0) {
req_capsule_shrink(pill, &RMF_DLM_LVB,
rc2, RCL_SERVER);
} else if (rc2 == -ERANGE) {
rc2 = req_capsule_server_grow(
pill, &RMF_DLM_LVB,
buflen);
if (!rc2) {
goto retry;
} else {
/*
* if we can't grow the buffer,
* it's ok to return empty lvb
* to client.
*/
req_capsule_shrink(
pill, &RMF_DLM_LVB, 0,
RCL_SERVER);
}
} else {
rc = rc2;
}
} else if (flags & LDLM_FL_REPLAY) {
/* no LVB resend upon replay */
if (buflen > 0)
req_capsule_shrink(pill, &RMF_DLM_LVB,
0, RCL_SERVER);
else
rc = buflen;
} else {
rc = buflen;
}
}
if ((rc != 0 || err == ELDLM_LOCK_ABORTED) &&
!(flags & LDLM_FL_RESENT)) {
if (lock->l_export) {
ldlm_lock_cancel(lock);
} else {
lock_res_and_lock(lock);
ldlm_resource_unlink_lock(lock);
ldlm_lock_destroy_nolock(lock);
unlock_res_and_lock(lock);
}
ldlm_reprocess_all(lock->l_resource,
lock->l_policy_data.l_inodebits.bits);
}
if (!err && !ldlm_is_cbpending(lock) &&
dlm_req->lock_desc.l_resource.lr_type != LDLM_FLOCK)
ldlm_reprocess_all(lock->l_resource,
lock->l_policy_data.l_inodebits.bits);
ldlm_lock_put(lock);
}
LDLM_DEBUG_NOLOCK("server-side enqueue handler END (lock %p, rc %d)",
lock, rc);
return rc;
}
EXPORT_SYMBOL(ldlm_handle_enqueue);
/*
* Clear the blocking lock, the race is possible between ldlm_handle_convert0()
* and ldlm_work_bl_ast_lock(), so this is done under lock with check for NULL.
*/
void ldlm_clear_blocking_lock(struct ldlm_lock *lock)
{
if (lock->l_blocking_lock) {
ldlm_lock_put(lock->l_blocking_lock);
lock->l_blocking_lock = NULL;
}
}
/* A lock can be converted to new ibits or mode and should be considered
* as new lock. Clear all states related to a previous blocking AST
* processing so new conflicts will cause new blocking ASTs.
*
* This is used during lock convert below and lock downgrade to COS mode in
* ldlm_lock_mode_downgrade().
*/
void ldlm_clear_blocking_data(struct ldlm_lock *lock)
{
ldlm_clear_ast_sent(lock);
lock->l_bl_ast_run = 0;
ldlm_clear_blocking_lock(lock);
}
/* Main LDLM entry point for server code to process lock conversion requests */
int ldlm_handle_convert0(struct ptlrpc_request *req,
const struct ldlm_request *dlm_req)
{
struct obd_export *exp = req->rq_export;
struct ldlm_reply *dlm_rep;
struct ldlm_lock *lock;
enum mds_ibits_locks bits;
enum mds_ibits_locks new_bits;
int rc;
ENTRY;
if (exp && exp->exp_nid_stats && exp->exp_nid_stats->nid_ldlm_stats)
lprocfs_counter_incr(exp->exp_nid_stats->nid_ldlm_stats,
LDLM_CONVERT - LDLM_FIRST_OPC);
rc = req_capsule_server_pack(&req->rq_pill);
if (rc)
RETURN(rc);
dlm_rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
dlm_rep->lock_flags = dlm_req->lock_flags;
lock = ldlm_handle2lock(&dlm_req->lock_handle[0]);
if (!lock) {
LDLM_DEBUG_NOLOCK("server lock is canceled already");
req->rq_status = ELDLM_NO_LOCK_DATA;
RETURN(0);
}
LDLM_DEBUG(lock, "server-side convert handler START");
lock_res_and_lock(lock);
bits = lock->l_policy_data.l_inodebits.bits;
new_bits = dlm_req->lock_desc.l_policy_data.l_inodebits.bits;
if (ldlm_is_cancel(lock)) {
LDLM_DEBUG(lock, "convert on canceled lock!");
unlock_res_and_lock(lock);
GOTO(out_put, rc = ELDLM_NO_LOCK_DATA);
}
if (dlm_req->lock_desc.l_req_mode != lock->l_granted_mode) {
LDLM_ERROR(lock, "lock mode differs!");
unlock_res_and_lock(lock);
GOTO(out_put, rc = -EPROTO);
}
if (bits == new_bits) {
/*
* This can be valid situation if CONVERT RPCs are
* re-ordered. Just finish silently
*/
LDLM_DEBUG(lock, "lock is converted already!");
unlock_res_and_lock(lock);
} else {
if (ldlm_is_waited(lock))
ldlm_del_waiting_lock(lock);
ldlm_clear_cbpending(lock);
lock->l_policy_data.l_inodebits.cancel_bits =
MDS_INODELOCK_NONE;
ldlm_inodebits_drop(lock, bits & ~new_bits);
ldlm_clear_blocking_data(lock);
unlock_res_and_lock(lock);
/* All old bits should be reprocessed to send new BL AST if
* it wasn't sent earlier due to LDLM_FL_AST_SENT bit set.
*/
ldlm_reprocess_all(lock->l_resource, bits);
}
dlm_rep->lock_handle = lock->l_remote_handle;
ldlm_ibits_policy_local_to_wire(&lock->l_policy_data,
&dlm_rep->lock_desc.l_policy_data);
rc = ELDLM_OK;
EXIT;
out_put:
LDLM_DEBUG(lock, "server-side convert handler END, rc = %d", rc);
ldlm_lock_put(lock);
req->rq_status = rc;
return 0;
}
/**
* Cancel all the locks whose handles are packed into ldlm_request
*
* Called by server code expecting such combined cancel activity
* requests.
*/
int ldlm_request_cancel(struct ptlrpc_request *req,
const struct ldlm_request *dlm_req,
int first, enum lustre_at_flags flags)
{
struct ldlm_resource *res, *pres = NULL;
struct ldlm_lock *lock;
int i, count, done = 0;
unsigned int size;
ENTRY;
size = req_capsule_get_size(&req->rq_pill, &RMF_DLM_REQ, RCL_CLIENT);
if (size <= sizeof(*dlm_req) || dlm_req->lock_count >
(size - sizeof(*dlm_req)) / sizeof(struct lustre_handle))
RETURN(0);
count = dlm_req->lock_count ? dlm_req->lock_count : 1;
if (first >= count)
RETURN(0);
if (count == 1 && dlm_req->lock_handle[0].cookie == 0)
RETURN(0);
/*
* There is no lock on the server at the replay time,
* skip lock cancelling to make replay tests to pass.
*/
if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
RETURN(0);
LDLM_DEBUG_NOLOCK("server-side cancel handler START: %d locks, starting at %d",
count, first);
for (i = first; i < count; i++) {
lock = ldlm_handle2lock(&dlm_req->lock_handle[i]);
if (!lock) {
/* below message checked in replay-single.sh test_36 */
LDLM_DEBUG_NOLOCK("server-side cancel handler stale lock (cookie %llx)",
dlm_req->lock_handle[i].cookie);
continue;
}
if (lock->l_export != req->rq_export) {
LDLM_DEBUG_NOLOCK("server-side cancel mismatched export (cookie %llx)",
dlm_req->lock_handle[i].cookie);
ldlm_lock_put(lock);
continue;
}
res = lock->l_resource;
done++;
/*
* This code is an optimization to only attempt lock
* granting on the resource (that could be CPU-expensive)
* after we are done cancelling lock in that resource.
*/
if (res != pres) {
if (pres != NULL) {
ldlm_reprocess_all(pres, 0);
ldlm_resource_putref(pres);
}
if (res != NULL) {
ldlm_resource_getref(res);
if (!ldlm_is_discard_data(lock))
ldlm_lvbo_update(res, lock,
NULL, 1);
}
pres = res;
}
if ((flags & LATF_STATS) && ldlm_is_ast_sent(lock) &&
lock->l_blast_sent != 0) {
timeout_t delay = 0;
if (ktime_get_seconds() > lock->l_blast_sent)
delay = ktime_get_seconds() -
lock->l_blast_sent;
LDLM_DEBUG(lock,
"server cancels blocked lock after %ds",
delay);
obd_at_measure(lock->l_export->exp_obd,
&lock->l_export->exp_bl_lock_at,
delay);
}
ldlm_lock_cancel(lock);
ldlm_lock_put(lock);
}
if (pres != NULL) {
ldlm_reprocess_all(pres, 0);
ldlm_resource_putref(pres);
}
LDLM_DEBUG_NOLOCK("server-side cancel handler END");
RETURN(done);
}
EXPORT_SYMBOL(ldlm_request_cancel);
/**
* Main LDLM entry point for server code to cancel locks.
*
* Typically gets called from service handler on LDLM_CANCEL opc.
*/
int ldlm_handle_cancel(struct ptlrpc_request *req)
{
struct ldlm_request *dlm_req;
int rc;
ENTRY;
dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
if (dlm_req == NULL) {
CDEBUG(D_INFO, "bad request buffer for cancel\n");
RETURN(-EFAULT);
}
if (req_capsule_get_size(&req->rq_pill, &RMF_DLM_REQ, RCL_CLIENT) <
offsetof(struct ldlm_request, lock_handle[1]))
RETURN(-EPROTO);
if (req->rq_export && req->rq_export->exp_nid_stats &&
req->rq_export->exp_nid_stats->nid_ldlm_stats)
lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats,
LDLM_CANCEL - LDLM_FIRST_OPC);
rc = req_capsule_server_pack(&req->rq_pill);
if (rc)
RETURN(rc);
if (!ldlm_request_cancel(req, dlm_req, 0, LATF_STATS))
req->rq_status = LUSTRE_ESTALE;
RETURN(ptlrpc_reply(req));
}
#endif /* CONFIG_LUSTRE_FS_SERVER */
/**
* Server may pass additional information about blocking lock.
* For IBITS locks it is conflicting bits which can be used for
* lock convert instead of cancel.
*/
void ldlm_bl_desc2lock(const struct ldlm_lock_desc *ld, struct ldlm_lock *lock)
{
struct ldlm_namespace *ns = ldlm_lock_to_ns(lock);
check_res_locked(lock->l_resource);
if (ns_is_client(ns) && ld &&
(lock->l_resource->lr_type == LDLM_IBITS)) {
/*
* Lock description contains policy of blocking lock,
* and its cancel_bits is used to pass conflicting bits.
* NOTE: ld can be NULL or can be not NULL but zeroed if
* passed from ldlm_bl_thread_blwi(), check below used bits
* in ld to make sure it is valid description.
*
* If server may replace lock resource keeping the same cookie,
* never use cancel bits from different resource, full cancel
* is to be used.
*/
if (ld->l_policy_data.l_inodebits.cancel_bits &&
ldlm_res_eq(&ld->l_resource.lr_name,
&lock->l_resource->lr_name) &&
!(ldlm_is_cbpending(lock) &&
lock->l_policy_data.l_inodebits.cancel_bits ==
MDS_INODELOCK_NONE)) {
/* always combine conflicting ibits */
lock->l_policy_data.l_inodebits.cancel_bits |=
ld->l_policy_data.l_inodebits.cancel_bits;
} else {
/* If cancel_bits are not obtained or
* if the lock is already CBPENDING and
* has no cancel_bits set
* - the full lock is to be cancelled
*/
lock->l_policy_data.l_inodebits.cancel_bits =
MDS_INODELOCK_NONE;
}
}
}
/**
* Callback handler for receiving incoming blocking ASTs.
*
* This can only happen on client side.
*/
void ldlm_handle_bl_callback(struct ldlm_namespace *ns,
struct ldlm_lock_desc *ld, struct ldlm_lock *lock)
{
int do_ast;
ENTRY;
LDLM_DEBUG(lock, "client blocking AST callback handler");
lock_res_and_lock(lock);
/* get extra information from desc if any */
ldlm_bl_desc2lock(ld, lock);
ldlm_set_cbpending(lock);
do_ast = (!lock->l_readers && !lock->l_writers);
unlock_res_and_lock(lock);
if (do_ast) {
CDEBUG(D_DLMTRACE,
"Lock %p already unused, calling callback (%p)\n",
lock, lock->l_blocking_ast);
if (lock->l_blocking_ast != NULL)
lock->l_blocking_ast(lock, ld, lock->l_ast_data,
LDLM_CB_BLOCKING);
} else {
CDEBUG(D_DLMTRACE,
"Lock %p is referenced, will be cancelled later\n",
lock);
if (ns->ns_hp_handler != NULL)
ns->ns_hp_handler(lock);
}
LDLM_DEBUG(lock, "client blocking callback handler END");
ldlm_lock_put(lock);
EXIT;
}
static int ldlm_callback_reply(struct ptlrpc_request *req, int rc)
{
if (req->rq_no_reply)
return 0;
req->rq_status = rc;
if (!req->rq_packed_final) {
rc = lustre_pack_reply(req, 1, NULL, NULL);
if (rc)
return rc;
}
return ptlrpc_reply(req);
}
/**
* Callback handler for receiving incoming completion ASTs.
*
* This only can happen on client side.
*/
static int ldlm_handle_cp_callback(struct ptlrpc_request *req,
struct ldlm_namespace *ns,
struct ldlm_request *dlm_req,
struct ldlm_lock *lock)
{
LIST_HEAD(ast_list);
int lvb_len;
int rc = 0;
ENTRY;
LDLM_DEBUG(lock, "client completion callback handler START");
if (CFS_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_BL_CB_RACE)) {
long to = cfs_time_seconds(1);
ldlm_callback_reply(req, 0);
while (to > 0) {
to = schedule_timeout_interruptible(to);
if (ldlm_is_granted(lock) ||
ldlm_is_destroyed(lock))
break;
}
}
lvb_len = req_capsule_get_size(&req->rq_pill, &RMF_DLM_LVB, RCL_CLIENT);
if (lvb_len < 0) {
LDLM_ERROR(lock, "Fail to get lvb_len, rc = %d", lvb_len);
GOTO(out, rc = lvb_len);
} else if (lvb_len > 0) {
if (lock->l_lvb_len > 0) {
/* for extent lock, lvb contains ost_lvb{}. */
LASSERT(lock->l_lvb_data != NULL);
if (unlikely(lock->l_lvb_len < lvb_len)) {
LDLM_ERROR(lock,
"Replied LVB is larger than expectation, expected = %u, replied = %u",
lock->l_lvb_len, lvb_len);
GOTO(out, rc = -EINVAL);
}
}
}
lock_res_and_lock(lock);
if (!ldlm_res_eq(&dlm_req->lock_desc.l_resource.lr_name,
&lock->l_resource->lr_name)) {
ldlm_resource_unlink_lock(lock);
unlock_res_and_lock(lock);
rc = ldlm_lock_change_resource(ns, lock,
&dlm_req->lock_desc.l_resource.lr_name);
if (rc < 0) {
LDLM_ERROR(lock, "Failed to allocate resource");
GOTO(out, rc);
}
LDLM_DEBUG(lock, "completion AST, new resource");
lock_res_and_lock(lock);
}
if (ldlm_is_failed(lock)) {
unlock_res_and_lock(lock);
ldlm_lock_put(lock);
RETURN(-EINVAL);
}
if (ldlm_is_destroyed(lock) ||
ldlm_is_granted(lock)) {
/* b=11300: the lock has already been granted */
unlock_res_and_lock(lock);
LDLM_DEBUG(lock, "Double grant race happened");
GOTO(out, rc = 0);
}
/*
* If we receive the completion AST before the actual enqueue returned,
* then we might need to switch lock modes, resources, or extents.
*/
if (dlm_req->lock_desc.l_granted_mode != lock->l_req_mode) {
lock->l_req_mode = dlm_req->lock_desc.l_granted_mode;
LDLM_DEBUG(lock, "completion AST, new lock mode");
}
if (lock->l_resource->lr_type != LDLM_PLAIN) {
ldlm_convert_policy_to_local(req->rq_export,
dlm_req->lock_desc.l_resource.lr_type,
&dlm_req->lock_desc.l_policy_data,
&lock->l_policy_data);
LDLM_DEBUG(lock, "completion AST, new policy data");
}
ldlm_resource_unlink_lock(lock);
if (dlm_req->lock_flags & LDLM_FL_AST_SENT) {
/*
* BL_AST locks are not needed in LRU.
* Let ldlm_cancel_lru() be fast.
*/
ldlm_lock_remove_from_lru(lock);
ldlm_bl_desc2lock(&dlm_req->lock_desc, lock);
lock->l_flags |= LDLM_FL_CBPENDING | LDLM_FL_BL_AST;
LDLM_DEBUG(lock, "completion AST includes blocking AST");
}
if (lock->l_lvb_len > 0) {
rc = ldlm_fill_lvb(lock, &req->rq_pill, RCL_CLIENT,
lock->l_lvb_data, lvb_len);
if (rc < 0) {
unlock_res_and_lock(lock);
GOTO(out, rc);
}
}
ldlm_grant_lock(lock, &ast_list);
unlock_res_and_lock(lock);
LDLM_DEBUG(lock, "callback handler finished, about to run_ast_work");
/*
* Let Enqueue to call osc_lock_upcall() and initialize
* l_ast_data
*/
CFS_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_ENQ_RACE, 2);
ldlm_run_ast_work(ns, &ast_list, LDLM_WORK_CP_AST);
LDLM_DEBUG_NOLOCK("client completion callback handler END (lock %p)",
lock);
GOTO(out, rc);
out:
if (rc < 0) {
lock_res_and_lock(lock);
ldlm_set_failed(lock);
unlock_res_and_lock(lock);
wake_up(&lock->l_waitq);
}
ldlm_lock_put(lock);
return 0;
}
/**
* Callback handler for receiving incoming glimpse ASTs.
*
* This only can happen on client side. After handling the glimpse AST
* we also consider dropping the lock here if it is unused locally for a
* long time.
*/
static void ldlm_handle_gl_callback(struct ptlrpc_request *req,
struct ldlm_namespace *ns,
struct ldlm_request *dlm_req,
struct ldlm_lock *lock)
{
struct ldlm_lock_desc *ld = &dlm_req->lock_desc;
int rc = -ENOSYS;
ENTRY;
LDLM_DEBUG(lock, "client glimpse AST callback handler");
if (lock->l_glimpse_ast != NULL)
rc = lock->l_glimpse_ast(lock, req);
if (req->rq_repmsg != NULL) {
ptlrpc_reply(req);
} else {
req->rq_status = rc;
ptlrpc_error(req);
}
lock_res_and_lock(lock);
if (lock->l_granted_mode == LCK_PW &&
!lock->l_readers && !lock->l_writers &&
ktime_after(ktime_get(),
ktime_add(lock->l_last_used, ns->ns_dirty_age_limit))) {
unlock_res_and_lock(lock);
/* For MDS glimpse it is always DOM lock, set corresponding
* cancel_bits to perform lock convert if needed
*/
if (lock->l_resource->lr_type == LDLM_IBITS)
ld->l_policy_data.l_inodebits.cancel_bits =
MDS_INODELOCK_DOM;
if (ldlm_bl_to_thread_lock(ns, ld, lock))
ldlm_handle_bl_callback(ns, ld, lock);
EXIT;
return;
}
unlock_res_and_lock(lock);
ldlm_lock_put(lock);
EXIT;
}
static int __ldlm_bl_to_thread(struct ldlm_bl_work_item *blwi,
enum ldlm_cancel_flags cancel_flags)
{
struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool;
char *prio = "regular";
int count;
ENTRY;
spin_lock(&blp->blp_lock);
/* cannot access blwi after added to list and lock is dropped */
count = blwi->blwi_lock ? 1 : blwi->blwi_count;
/* if the server is waiting on a lock to be cancelled (bl_ast), this is
* an urgent request and should go in the priority queue so it doesn't
* get stuck behind non-priority work (eg, lru size management)
*
* We also prioritize discard_data, which is for eviction handling
*/
if (blwi->blwi_lock &&
(ldlm_is_discard_data(blwi->blwi_lock) ||
ldlm_is_bl_ast(blwi->blwi_lock))) {
list_add_tail(&blwi->blwi_entry, &blp->blp_prio_list);
prio = "priority";
} else {
/* other blocking callbacks are added to the regular list */
list_add_tail(&blwi->blwi_entry, &blp->blp_list);
}
blp->blp_total_locks += count;
blp->blp_total_blwis++;
spin_unlock(&blp->blp_lock);
wake_up(&blp->blp_waitq);
/* unlocked read of blp values is intentional - OK for debug */
CDEBUG(D_DLMTRACE,
"added %d/%d locks to %s blp list, %d blwis in pool\n",
count, blp->blp_total_locks, prio, blp->blp_total_blwis);
/*
* can not check blwi->blwi_flags as blwi could be already freed in
* LCF_ASYNC mode
*/
if (!(cancel_flags & LCF_ASYNC))
wait_for_completion(&blwi->blwi_comp);
RETURN(0);
}
static inline void init_blwi(struct ldlm_bl_work_item *blwi,
struct ldlm_namespace *ns,
struct ldlm_lock_desc *ld,
struct list_head *cancels, int count,
struct ldlm_lock *lock,
enum ldlm_cancel_flags cancel_flags)
{
init_completion(&blwi->blwi_comp);
INIT_LIST_HEAD(&blwi->blwi_head);
if (current->flags & PF_MEMALLOC)
blwi->blwi_mem_pressure = 1;
blwi->blwi_ns = ns;
blwi->blwi_flags = cancel_flags;
if (ld != NULL)
blwi->blwi_ld = *ld;
if (count) {
list_splice_init(cancels, &blwi->blwi_head);
blwi->blwi_count = count;
} else {
blwi->blwi_lock = lock;
}
}
/**
* Queues a list of locks \a cancels containing \a count locks
* for later processing by a blocking thread. If \a count is zero,
* then the lock referenced as \a lock is queued instead.
*
* The blocking thread would then call ->l_blocking_ast callback in the lock.
* If list addition fails an error is returned and caller is supposed to
* call ->l_blocking_ast itself.
*/
static int ldlm_bl_to_thread(struct ldlm_namespace *ns,
struct ldlm_lock_desc *ld,
struct ldlm_lock *lock,
struct list_head *cancels, int count,
enum ldlm_cancel_flags cancel_flags)
{
ENTRY;
if (cancels && count == 0)
RETURN(0);
if (cancel_flags & LCF_ASYNC) {
struct ldlm_bl_work_item *blwi;
OBD_ALLOC(blwi, sizeof(*blwi));
if (blwi == NULL)
RETURN(-ENOMEM);
init_blwi(blwi, ns, ld, cancels, count, lock, cancel_flags);
RETURN(__ldlm_bl_to_thread(blwi, cancel_flags));
} else {
/*
* if it is synchronous call do minimum mem alloc, as it could
* be triggered from kernel shrinker
*/
struct ldlm_bl_work_item blwi;
memset(&blwi, 0, sizeof(blwi));
init_blwi(&blwi, ns, ld, cancels, count, lock, cancel_flags);
RETURN(__ldlm_bl_to_thread(&blwi, cancel_flags));
}
}
int ldlm_bl_to_thread_lock(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
struct ldlm_lock *lock)
{
return ldlm_bl_to_thread(ns, ld, lock, NULL, 0, LCF_ASYNC);
}
int ldlm_bl_to_thread_list(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld,
struct list_head *cancels, int count,
enum ldlm_cancel_flags cancel_flags)
{
return ldlm_bl_to_thread(ns, ld, NULL, cancels, count, cancel_flags);
}
int ldlm_bl_to_thread_ns(struct ldlm_namespace *ns)
{
return ldlm_bl_to_thread(ns, NULL, NULL, NULL, 0, LCF_ASYNC);
}
int ldlm_bl_thread_wakeup(void)
{
wake_up(&ldlm_state->ldlm_bl_pool->blp_waitq);
return 0;
}
/* Setinfo coming from Server (eg MDT) to Client (eg MDC)! */
static int ldlm_handle_setinfo(struct ptlrpc_request *req)
{
struct obd_device *obd = req->rq_export->exp_obd;
char *key;
void *val;
int keylen, vallen;
int rc = -ENOSYS;
ENTRY;
DEBUG_REQ(D_HSM, req, "%s: handle setinfo", obd->obd_name);
req_capsule_set(&req->rq_pill, &RQF_OBD_SET_INFO);
key = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
if (key == NULL) {
DEBUG_REQ(D_IOCTL, req, "no set_info key");
RETURN(-EFAULT);
}
keylen = req_capsule_get_size(&req->rq_pill, &RMF_SETINFO_KEY,
RCL_CLIENT);
val = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_VAL);
if (val == NULL) {
DEBUG_REQ(D_IOCTL, req, "no set_info val");
RETURN(-EFAULT);
}
vallen = req_capsule_get_size(&req->rq_pill, &RMF_SETINFO_VAL,
RCL_CLIENT);
/* We are responsible for swabbing contents of val */
if (KEY_IS(KEY_HSM_COPYTOOL_SEND))
/* Pass it on to mdc (the "export" in this case) */
rc = obd_set_info_async(req->rq_svc_thread->t_env,
req->rq_export,
sizeof(KEY_HSM_COPYTOOL_SEND),
KEY_HSM_COPYTOOL_SEND,
vallen, val, NULL);
else
DEBUG_REQ(D_WARNING, req, "ignoring unknown key '%s'", key);
return rc;
}
static inline void ldlm_callback_errmsg(struct ptlrpc_request *req,
const char *msg, int rc,
const struct lustre_handle *handle)
{
DEBUG_REQ((req->rq_no_reply || rc) ? D_WARNING : D_DLMTRACE, req,
"%s, NID=%s lock=%#llx: rc = %d",
msg, libcfs_idstr(&req->rq_peer),
handle ? handle->cookie : 0, rc);
if (req->rq_no_reply)
CWARN("No reply was sent, maybe cause b=21636.\n");
else if (rc)
CWARN("Send reply failed, maybe cause b=21636.\n");
}
/* TODO: handle requests in a similar way as MDT: see mdt_handle_common() */
static int ldlm_callback_handler(struct ptlrpc_request *req)
{
struct ldlm_namespace *ns;
struct ldlm_request *dlm_req;
struct ldlm_lock *lock;
int rc;
ENTRY;
/*
* Requests arrive in sender's byte order. The ptlrpc service
* handler has already checked and, if necessary, byte-swapped the
* incoming request message body, but I am responsible for the
* message buffers.
*/
/* do nothing for sec context finalize */
if (lustre_msg_get_opc(req->rq_reqmsg) == SEC_CTX_FINI)
RETURN(0);
req_capsule_init(&req->rq_pill, req, RCL_SERVER);
if (req->rq_export == NULL) {
rc = ldlm_callback_reply(req, -ENOTCONN);
ldlm_callback_errmsg(req, "Operate on unconnected server",
rc, NULL);
RETURN(0);
}
LASSERT(req->rq_export != NULL);
LASSERT(req->rq_export->exp_obd != NULL);
switch (lustre_msg_get_opc(req->rq_reqmsg)) {
case LDLM_BL_CALLBACK:
if (CFS_FAIL_CHECK(OBD_FAIL_LDLM_BL_CALLBACK_NET)) {
if (cfs_fail_err)
ldlm_callback_reply(req, -(int)cfs_fail_err);
RETURN(0);
}
break;
case LDLM_CP_CALLBACK:
if (CFS_FAIL_CHECK(OBD_FAIL_LDLM_CP_CALLBACK_NET))
RETURN(0);
break;
case LDLM_GL_CALLBACK:
if (CFS_FAIL_CHECK(OBD_FAIL_LDLM_GL_CALLBACK_NET))
RETURN(0);
break;
case LDLM_SET_INFO:
rc = ldlm_handle_setinfo(req);
ldlm_callback_reply(req, rc);
RETURN(0);
default:
CERROR("unknown opcode %u\n",
lustre_msg_get_opc(req->rq_reqmsg));
ldlm_callback_reply(req, -EPROTO);
RETURN(0);
}
ns = req->rq_export->exp_obd->obd_namespace;
LASSERT(ns != NULL);
req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
if (dlm_req == NULL) {
rc = ldlm_callback_reply(req, -EPROTO);
ldlm_callback_errmsg(req, "Operate without parameter", rc,
NULL);
RETURN(0);
}
if (dlm_req->lock_flags & ~LDLM_FL_WIRE_AST_FLAGS_MASK) {
rc = ldlm_callback_reply(req, -EPROTO);
ldlm_callback_errmsg(req, "invalid lock request flags",
dlm_req->lock_flags &
~LDLM_FL_WIRE_AST_FLAGS_MASK, NULL);
RETURN(0);
}
/*
* Force a known safe race, send a cancel to the server for a lock
* which the server has already started a blocking callback on.
*/
if (CFS_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_BL_CB_RACE) &&
lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK) {
rc = ldlm_cli_cancel(&dlm_req->lock_handle[0], 0);
if (rc < 0)
CERROR("ldlm_cli_cancel: %d\n", rc);
}
lock = ldlm_handle2lock_long(&dlm_req->lock_handle[0], 0);
if (!lock) {
CDEBUG(D_DLMTRACE,
"callback on lock %#llx - lock disappeared\n",
dlm_req->lock_handle[0].cookie);
rc = ldlm_callback_reply(req, -EINVAL);
ldlm_callback_errmsg(req, "Operate with invalid parameter", rc,
&dlm_req->lock_handle[0]);
RETURN(0);
}
if (ldlm_is_fail_loc(lock) &&
lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK)
CFS_RACE(OBD_FAIL_LDLM_CP_BL_RACE);
/* Copy hints/flags (e.g. LDLM_FL_DISCARD_DATA) from AST. */
lock_res_and_lock(lock);
lock->l_flags |= ldlm_flags_from_wire(dlm_req->lock_flags &
LDLM_FL_AST_MASK);
if (lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK) {
/*
* If somebody cancels lock and cache is already dropped,
* or lock is failed before cp_ast received on client,
* we can tell the server we have no lock. Otherwise, we
* should send cancel after dropping the cache.
*/
if ((ldlm_is_canceling(lock) && ldlm_is_bl_done(lock)) ||
ldlm_is_failed(lock)) {
LDLM_DEBUG(lock,
"callback on lock %llx - lock disappeared",
dlm_req->lock_handle[0].cookie);
unlock_res_and_lock(lock);
ldlm_lock_put(lock);
rc = ldlm_callback_reply(req, -EINVAL);
ldlm_callback_errmsg(req, "Operate on stale lock", rc,
&dlm_req->lock_handle[0]);
RETURN(0);
}
/*
* BL_AST locks are not needed in LRU.
* Let ldlm_cancel_lru() be fast.
*/
ldlm_lock_remove_from_lru(lock);
ldlm_set_bl_ast(lock);
}
if (lock->l_remote_handle.cookie == 0)
lock->l_remote_handle = dlm_req->lock_handle[1];
unlock_res_and_lock(lock);
/*
* We want the ost thread to get this reply so that it can respond
* to ost requests (write cache writeback) that might be triggered
* in the callback.
*
* But we'd also like to be able to indicate in the reply that we're
* cancelling right now, because it's unused, or have an intent result
* in the reply, so we might have to push the responsibility for sending
* the reply down into the AST handlers, alas.
*/
switch (lustre_msg_get_opc(req->rq_reqmsg)) {
case LDLM_BL_CALLBACK:
LDLM_DEBUG(lock, "blocking ast ");
req_capsule_extend(&req->rq_pill, &RQF_LDLM_BL_CALLBACK);
if (!ldlm_is_cancel_on_block(lock)) {
rc = ldlm_callback_reply(req, 0);
if (req->rq_no_reply || rc)
ldlm_callback_errmsg(req, "Normal process", rc,
&dlm_req->lock_handle[0]);
}
if (ldlm_bl_to_thread_lock(ns, &dlm_req->lock_desc, lock))
ldlm_handle_bl_callback(ns, &dlm_req->lock_desc, lock);
break;
case LDLM_CP_CALLBACK:
LDLM_DEBUG(lock, "completion ast ");
req_capsule_extend(&req->rq_pill, &RQF_LDLM_CP_CALLBACK);
rc = ldlm_handle_cp_callback(req, ns, dlm_req, lock);
if (!CFS_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_BL_CB_RACE))
ldlm_callback_reply(req, rc);
break;
case LDLM_GL_CALLBACK:
LDLM_DEBUG(lock, "glimpse ast ");
req_capsule_extend(&req->rq_pill, &RQF_LDLM_GL_CALLBACK);
ldlm_handle_gl_callback(req, ns, dlm_req, lock);
break;
default:
LBUG(); /* checked above */
}
RETURN(0);
}
#ifdef CONFIG_LUSTRE_FS_SERVER
/**
* Main handler for canceld thread.
*
* Separated into its own thread to avoid deadlocks.
*/
static int ldlm_cancel_handler(struct ptlrpc_request *req)
{
int rc;
ENTRY;
/*
* Requests arrive in sender's byte order. The ptlrpc service
* handler has already checked and, if necessary, byte-swapped the
* incoming request message body, but I am responsible for the
* message buffers.
*/
req_capsule_init(&req->rq_pill, req, RCL_SERVER);
if (req->rq_export == NULL) {
struct ldlm_request *dlm_req;
CERROR("%s from %s arrived at %llu with bad export cookie %llu\n",
ll_opcode2str(lustre_msg_get_opc(req->rq_reqmsg)),
libcfs_nidstr(&req->rq_peer.nid),
(unsigned long long)req->rq_arrival_time.tv_sec,
lustre_msg_get_handle(req->rq_reqmsg)->cookie);
if (lustre_msg_get_opc(req->rq_reqmsg) == LDLM_CANCEL) {
req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
dlm_req = req_capsule_client_get(&req->rq_pill,
&RMF_DLM_REQ);
if (dlm_req != NULL)
ldlm_lock_dump_handle(D_ERROR,
&dlm_req->lock_handle[0]);
}
ldlm_callback_reply(req, -ENOTCONN);
RETURN(0);
}
switch (lustre_msg_get_opc(req->rq_reqmsg)) {
/* XXX FIXME move this back to mds/handler.c, b=249 */
case LDLM_CANCEL:
req_capsule_set(&req->rq_pill, &RQF_LDLM_CANCEL);
CDEBUG(D_INODE, "cancel\n");
if (CFS_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_NET) ||
CFS_FAIL_CHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND) ||
CFS_FAIL_CHECK(OBD_FAIL_LDLM_BL_EVICT))
RETURN(0);
rc = ldlm_handle_cancel(req);
break;
case LDLM_CONVERT:
{
struct ldlm_request *dlm_req;
req_capsule_set(&req->rq_pill, &RQF_LDLM_CONVERT);
CDEBUG(D_INODE, "convert\n");
dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
if (dlm_req == NULL) {
CDEBUG(D_INFO, "bad request buffer for cancel\n");
rc = ldlm_callback_reply(req, -EPROTO);
} else {
req->rq_status = ldlm_handle_convert0(req, dlm_req);
rc = ptlrpc_reply(req);
}
break;
}
default:
CERROR("invalid opcode %d\n",
lustre_msg_get_opc(req->rq_reqmsg));
req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK);
rc = ldlm_callback_reply(req, -EINVAL);
}
RETURN(rc);
}
static int ldlm_cancel_hpreq_lock_match(struct ptlrpc_request *req,
struct ldlm_lock *lock)
{
struct ldlm_request *dlm_req;
struct lustre_handle lockh;
int rc = 0;
int i;
ENTRY;
dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
if (dlm_req == NULL)
RETURN(0);
ldlm_lock2handle(lock, &lockh);
for (i = 0; i < dlm_req->lock_count; i++) {
if (lustre_handle_equal(&dlm_req->lock_handle[i],
&lockh)) {
DEBUG_REQ(D_RPCTRACE, req,
"Prio raised by lock %#llx", lockh.cookie);
rc = 1;
break;
}
}
RETURN(rc);
}
static int ldlm_cancel_hpreq_check(struct ptlrpc_request *req)
{
struct ldlm_request *dlm_req;
int rc = 0;
int i;
unsigned int size;
ENTRY;
/* no prolong in recovery */
if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
RETURN(0);
dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ);
if (dlm_req == NULL)
RETURN(-EFAULT);
size = req_capsule_get_size(&req->rq_pill, &RMF_DLM_REQ, RCL_CLIENT);
if (size <= offsetof(struct ldlm_request, lock_handle) ||
(size - offsetof(struct ldlm_request, lock_handle)) /
sizeof(struct lustre_handle) < dlm_req->lock_count)
RETURN(-EPROTO);
for (i = 0; i < dlm_req->lock_count; i++) {
struct ldlm_lock *lock;
/*
* 1st locks is enough. Others are guaranteed to get a separate
* cancel RPC or EINVAL on BLAST RPC.
*/
if (exp_connect_hpreq_check1(req->rq_export) && i > 0)
break;
lock = ldlm_handle2lock(&dlm_req->lock_handle[i]);
if (lock == NULL)
continue;
rc = ldlm_is_ast_sent(lock) ? 1 : 0;
if (rc)
LDLM_DEBUG(lock, "hpreq cancel/convert lock");
ldlm_lock_put(lock);
if (rc)
break;
}
RETURN(rc);
}
static struct ptlrpc_hpreq_ops ldlm_cancel_hpreq_ops = {
.hpreq_lock_match = ldlm_cancel_hpreq_lock_match,
.hpreq_check = ldlm_cancel_hpreq_check,
.hpreq_fini = NULL,
};
static int ldlm_hpreq_handler(struct ptlrpc_request *req)
{
ENTRY;
req_capsule_init(&req->rq_pill, req, RCL_SERVER);
if (req->rq_export == NULL)
RETURN(0);
if (lustre_msg_get_opc(req->rq_reqmsg) == LDLM_CANCEL) {
req_capsule_set(&req->rq_pill, &RQF_LDLM_CANCEL);
req->rq_ops = &ldlm_cancel_hpreq_ops;
} else if (lustre_msg_get_opc(req->rq_reqmsg) == LDLM_CONVERT) {
req_capsule_set(&req->rq_pill, &RQF_LDLM_CONVERT);
req->rq_ops = &ldlm_cancel_hpreq_ops;
}
RETURN(0);
}
void ldlm_revoke_export_locks(struct obd_export *exp)
{
struct lu_env *env = lu_env_find();
struct lu_env _env;
int rc = 0;
ENTRY;
if (!env) {
rc = lu_env_init(&_env, LCT_DT_THREAD);
if (rc)
RETURN_EXIT;
env = &_env;
rc = lu_env_add(env);
if (rc)
GOTO(out_env_fini, rc);
}
/* From ldlm_bl_thread_exports:
* If the given export has blocked locks, the next in the list may have
* them too, thus cancel regular locks only if the current export has
* no blocked locks.
*/
rc = ldlm_export_cancel_blocked_locks(exp);
if (rc == 0)
ldlm_export_cancel_locks(exp);
if (env == &_env) {
lu_env_remove(env);
out_env_fini:
lu_env_fini(env);
}
EXIT;
}
EXPORT_SYMBOL(ldlm_revoke_export_locks);
#endif /* CONFIG_LUSTRE_FS_SERVER */
static int ldlm_bl_get_work(struct ldlm_bl_pool *blp,
struct ldlm_bl_work_item **p_blwi,
struct obd_export **p_exp)
{
struct ldlm_bl_work_item *blwi = NULL;
static unsigned int num_bl;
static unsigned int num_stale;
int num_th = atomic_read(&blp->blp_num_threads);
*p_exp = obd_stale_export_get();
spin_lock(&blp->blp_lock);
if (*p_exp != NULL) {
if (num_th == 1 || ++num_stale < num_th) {
spin_unlock(&blp->blp_lock);
return 1;
}
num_stale = 0;
}
/* process a request from the blp_list at least every blp_num_threads */
if (!list_empty(&blp->blp_list) &&
(list_empty(&blp->blp_prio_list) || num_bl == 0))
blwi = list_first_entry(&blp->blp_list,
struct ldlm_bl_work_item, blwi_entry);
else
if (!list_empty(&blp->blp_prio_list))
blwi = list_first_entry(&blp->blp_prio_list,
struct ldlm_bl_work_item,
blwi_entry);
if (blwi) {
if (++num_bl >= num_th)
num_bl = 0;
list_del(&blwi->blwi_entry);
blp->blp_total_locks -= blwi->blwi_lock ? 1 : blwi->blwi_count;
blp->blp_total_blwis--;
}
spin_unlock(&blp->blp_lock);
*p_blwi = blwi;
/* intentional unlocked read of blp values - OK for debug */
if (blwi) {
CDEBUG(D_DLMTRACE,
"Got %d locks of %d total in blp. (%d blwis in pool)\n",
blwi->blwi_lock ? 1 : blwi->blwi_count,
blp->blp_total_locks, blp->blp_total_blwis);
} else {
CDEBUG(D_DLMTRACE,
"No blwi found in queue (no bl locks in queue)\n");
}
if (*p_exp != NULL && *p_blwi != NULL) {
obd_stale_export_put(*p_exp);
*p_exp = NULL;
}
return (*p_blwi != NULL || *p_exp != NULL) ? 1 : 0;
}
/* This only contains temporary data until the thread starts */
struct ldlm_bl_thread_data {
struct ldlm_bl_pool *bltd_blp;
struct completion bltd_comp;
int bltd_num;
};
static int ldlm_bl_thread_main(void *arg);
static int ldlm_bl_thread_start(struct ldlm_bl_pool *blp, bool check_busy)
{
struct ldlm_bl_thread_data bltd = { .bltd_blp = blp };
struct task_struct *task;
init_completion(&bltd.bltd_comp);
bltd.bltd_num = atomic_inc_return(&blp->blp_num_threads);
if (bltd.bltd_num >= blp->blp_max_threads) {
atomic_dec(&blp->blp_num_threads);
return 0;
}
LASSERTF(bltd.bltd_num > 0, "thread num:%d\n", bltd.bltd_num);
if (check_busy &&
atomic_read(&blp->blp_busy_threads) < (bltd.bltd_num - 1)) {
atomic_dec(&blp->blp_num_threads);
return 0;
}
task = kthread_run(ldlm_bl_thread_main, &bltd, "ldlm_bl_%02d",
bltd.bltd_num);
if (IS_ERR(task)) {
CERROR("cannot start LDLM thread ldlm_bl_%02d: rc %ld\n",
bltd.bltd_num, PTR_ERR(task));
atomic_dec(&blp->blp_num_threads);
return PTR_ERR(task);
}
wait_for_completion(&bltd.bltd_comp);
return 0;
}
/* Not fatal if racy and have a few too many threads */
static int ldlm_bl_thread_need_create(struct ldlm_bl_pool *blp,
struct ldlm_bl_work_item *blwi)
{
if (atomic_read(&blp->blp_num_threads) >= blp->blp_max_threads)
return 0;
if (atomic_read(&blp->blp_busy_threads) <
atomic_read(&blp->blp_num_threads))
return 0;
if (blwi != NULL && (blwi->blwi_ns == NULL ||
blwi->blwi_mem_pressure))
return 0;
return 1;
}
static int ldlm_bl_thread_blwi(struct ldlm_bl_pool *blp,
struct ldlm_bl_work_item *blwi)
{
/* '1' for consistency with code that checks !mpflag to restore */
unsigned int mpflags = 1;
ENTRY;
if (blwi->blwi_ns == NULL)
/* added by ldlm_cleanup() */
RETURN(LDLM_ITER_STOP);
if (blwi->blwi_mem_pressure)
mpflags = memalloc_noreclaim_save();
CFS_FAIL_TIMEOUT(OBD_FAIL_LDLM_PAUSE_CANCEL2, 4);
if (blwi->blwi_count) {
int count;
/*
* The special case when we cancel locks in lru
* asynchronously, we pass the list of locks here.
* Thus locks are marked LDLM_FL_CANCELING, but NOT
* canceled locally yet.
*/
count = ldlm_cli_cancel_list_local(&blwi->blwi_head,
blwi->blwi_count, 0);
ldlm_cli_cancel_list(&blwi->blwi_head, count, NULL, NULL,
blwi->blwi_flags);
} else if (blwi->blwi_lock) {
ldlm_handle_bl_callback(blwi->blwi_ns, &blwi->blwi_ld,
blwi->blwi_lock);
} else {
ldlm_pool_recalc(&blwi->blwi_ns->ns_pool, true);
spin_lock(&blwi->blwi_ns->ns_lock);
clear_bit(LDLM_NS_RPC_RECALC, blwi->blwi_ns->ns_flags);
spin_unlock(&blwi->blwi_ns->ns_lock);
ldlm_namespace_put(blwi->blwi_ns);
}
if (blwi->blwi_mem_pressure)
memalloc_noreclaim_restore(mpflags);
if (blwi->blwi_flags & LCF_ASYNC)
OBD_FREE(blwi, sizeof(*blwi));
else
complete(&blwi->blwi_comp);
RETURN(0);
}
/**
* Cancel stale locks on export. Cancel blocked locks first.
* If the given export has blocked locks, the next in the list may have
* them too, thus cancel not blocked locks only if the current export has
* no blocked locks.
**/
static int ldlm_bl_thread_exports(struct ldlm_bl_pool *blp,
struct obd_export *exp)
{
int num;
ENTRY;
CFS_FAIL_TIMEOUT(OBD_FAIL_LDLM_BL_EVICT, 4);
num = ldlm_export_cancel_blocked_locks(exp);
if (num == 0)
ldlm_export_cancel_locks(exp);
obd_stale_export_put(exp);
RETURN(0);
}
/**
* Main blocking requests processing thread.
*
* Callers put locks into its queue by calling ldlm_bl_to_thread.
* This thread in the end ends up doing actual call to ->l_blocking_ast
* for queued locks.
*/
static int ldlm_bl_thread_main(void *arg)
{
struct lu_env *env;
struct ldlm_bl_pool *blp;
struct ldlm_bl_thread_data *bltd = arg;
int rc;
ENTRY;
OBD_ALLOC_PTR(env);
if (!env)
RETURN(-ENOMEM);
rc = lu_env_init(env, LCT_DT_THREAD);
if (rc)
GOTO(out_env, rc);
rc = lu_env_add(env);
if (rc)
GOTO(out_env_fini, rc);
blp = bltd->bltd_blp;
complete(&bltd->bltd_comp);
/* cannot use bltd after this, it is only on caller's stack */
while (1) {
struct ldlm_bl_work_item *blwi = NULL;
struct obd_export *exp = NULL;
int rc;
rc = ldlm_bl_get_work(blp, &blwi, &exp);
if (rc == 0)
wait_event_idle_exclusive(blp->blp_waitq,
ldlm_bl_get_work(blp, &blwi,
&exp));
atomic_inc(&blp->blp_busy_threads);
if (ldlm_bl_thread_need_create(blp, blwi))
/* discard the return value, we tried */
ldlm_bl_thread_start(blp, true);
if (exp)
rc = ldlm_bl_thread_exports(blp, exp);
else if (blwi)
rc = ldlm_bl_thread_blwi(blp, blwi);
atomic_dec(&blp->blp_busy_threads);
if (rc == LDLM_ITER_STOP)
break;
/*
* If there are many namespaces, we will not sleep waiting for
* work, and must do a cond_resched to avoid holding the CPU
* for too long
*/
cond_resched();
}
atomic_dec(&blp->blp_num_threads);
complete(&blp->blp_comp);
lu_env_remove(env);
out_env_fini:
lu_env_fini(env);
out_env:
OBD_FREE_PTR(env);
RETURN(rc);
}
static int ldlm_setup(void);
static int ldlm_cleanup(void);
int ldlm_get_ref(void)
{
int rc = 0;
ENTRY;
mutex_lock(&ldlm_ref_mutex);
if (++ldlm_refcount == 1) {
rc = ldlm_setup();
if (rc)
ldlm_refcount--;
}
mutex_unlock(&ldlm_ref_mutex);
RETURN(rc);
}
void ldlm_put_ref(void)
{
ENTRY;
mutex_lock(&ldlm_ref_mutex);
if (ldlm_refcount == 1) {
int rc = ldlm_cleanup();
if (rc)
CERROR("ldlm_cleanup failed: %d\n", rc);
else
ldlm_refcount--;
} else {
ldlm_refcount--;
}
mutex_unlock(&ldlm_ref_mutex);
EXIT;
}
/* Export handle<->lock hash operations. */
static unsigned
ldlm_export_lock_hash(struct cfs_hash *hs, const void *key,
const unsigned int bits)
{
return hash_64(((struct lustre_handle *)key)->cookie, bits);
}
static void *
ldlm_export_lock_key(struct hlist_node *hnode)
{
struct ldlm_lock *lock;
lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
return &lock->l_remote_handle;
}
static void
ldlm_export_lock_keycpy(struct hlist_node *hnode, void *key)
{
struct ldlm_lock *lock;
lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
lock->l_remote_handle = *(struct lustre_handle *)key;
}
static int
ldlm_export_lock_keycmp(const void *key, struct hlist_node *hnode)
{
return lustre_handle_equal(ldlm_export_lock_key(hnode), key);
}
static void *
ldlm_export_lock_object(struct hlist_node *hnode)
{
return hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
}
static void
ldlm_export_lock_get(struct cfs_hash *hs, struct hlist_node *hnode)
{
struct ldlm_lock *lock;
lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
ldlm_lock_get(lock);
}
static void
ldlm_export_lock_put(struct cfs_hash *hs, struct hlist_node *hnode)
{
struct ldlm_lock *lock;
lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
ldlm_lock_put(lock);
}
static struct cfs_hash_ops ldlm_export_lock_ops = {
.hs_hash = ldlm_export_lock_hash,
.hs_key = ldlm_export_lock_key,
.hs_keycmp = ldlm_export_lock_keycmp,
.hs_keycpy = ldlm_export_lock_keycpy,
.hs_object = ldlm_export_lock_object,
.hs_get = ldlm_export_lock_get,
.hs_put = ldlm_export_lock_put,
.hs_put_locked = ldlm_export_lock_put,
};
int ldlm_init_export(struct obd_export *exp)
{
int rc;
ENTRY;
exp->exp_lock_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_lock_ops,
CFS_HASH_DEFAULT | CFS_HASH_REHASH_KEY |
CFS_HASH_NBLK_CHANGE);
if (!exp->exp_lock_hash)
RETURN(-ENOMEM);
rc = ldlm_init_flock_export(exp);
if (rc)
GOTO(err, rc);
RETURN(0);
err:
ldlm_destroy_export(exp);
RETURN(rc);
}
EXPORT_SYMBOL(ldlm_init_export);
void ldlm_destroy_export(struct obd_export *exp)
{
ENTRY;
cfs_hash_putref(exp->exp_lock_hash);
exp->exp_lock_hash = NULL;
ldlm_destroy_flock_export(exp);
EXIT;
}
EXPORT_SYMBOL(ldlm_destroy_export);
static ssize_t dump_granted_max_show(struct kobject *kobj,
struct attribute *attr,
char *buf)
{
return scnprintf(buf, PAGE_SIZE, "%u\n",
ldlm_dump_granted_max);
}
static ssize_t dump_granted_max_store(struct kobject *kobj,
struct attribute *attr,
const char *buffer,
size_t count)
{
unsigned int val;
int rc;
rc = kstrtouint(buffer, 10, &val);
if (rc)
return rc;
ldlm_dump_granted_max = val;
return count;
}
LUSTRE_RW_ATTR(dump_granted_max);
static ssize_t cancel_unused_locks_before_replay_show(struct kobject *kobj,
struct attribute *attr,
char *buf)
{
return scnprintf(buf, PAGE_SIZE, "%d\n",
ldlm_cancel_unused_locks_before_replay);
}
static ssize_t cancel_unused_locks_before_replay_store(struct kobject *kobj,
struct attribute *attr,
const char *buffer,
size_t count)
{
int rc;
unsigned long val;
rc = kstrtoul(buffer, 10, &val);
if (rc)
return rc;
ldlm_cancel_unused_locks_before_replay = val;
return count;
}
LUSTRE_RW_ATTR(cancel_unused_locks_before_replay);
#ifdef CONFIG_LUSTRE_FS_SERVER
static ssize_t lock_reclaim_threshold_mb_show(struct kobject *kobj,
struct attribute *attr,
char *buf)
{
return scnprintf(buf, PAGE_SIZE, "%llu\n", ldlm_reclaim_threshold_mb);
}
static ssize_t lock_reclaim_threshold_mb_store(struct kobject *kobj,
struct attribute *attr,
const char *buffer,
size_t count)
{
u64 watermark, value;
int rc;
rc = sysfs_memparse(buffer, count, &value, "MiB");
if (rc < 0) {
CERROR("Failed to set lock_reclaim_threshold_mb, rc = %d.\n",
rc);
return rc;
} else if (value != 0 && value < (1 << 20)) {
CERROR("lock_reclaim_threshold_mb should be greater than 1MB.\n");
return -EINVAL;
}
watermark = value >> 20;
if (ldlm_lock_limit_mb != 0 && watermark > ldlm_lock_limit_mb) {
CERROR("lock_reclaim_threshold_mb must be smaller than lock_limit_mb.\n");
return -EINVAL;
}
ldlm_reclaim_threshold_mb = watermark;
if (watermark != 0) {
watermark <<= 20;
do_div(watermark, LDLM_LOCK_MEM_OVERHEAD);
}
ldlm_reclaim_threshold = watermark;
return count;
}
LUSTRE_RW_ATTR(lock_reclaim_threshold_mb);
static ssize_t lock_limit_mb_show(struct kobject *kobj,
struct attribute *attr,
char *buf)
{
return scnprintf(buf, PAGE_SIZE, "%llu\n", ldlm_lock_limit_mb);
}
static ssize_t lock_limit_mb_store(struct kobject *kobj,
struct attribute *attr,
const char *buffer,
size_t count)
{
u64 watermark, value;
int rc;
rc = sysfs_memparse(buffer, count, &value, "MiB");
if (rc < 0) {
CERROR("Failed to set lock_limit_mb, rc = %d.\n", rc);
return rc;
} else if (value != 0 && value < (1 << 20)) {
CERROR("lock_limit_mb should be greater than 1MB.\n");
return -EINVAL;
}
watermark = value >> 20;
if (ldlm_reclaim_threshold_mb != 0 &&
watermark < ldlm_reclaim_threshold_mb) {
CERROR("lock_limit_mb must be greater than lock_reclaim_threshold_mb.\n");
return -EINVAL;
}
ldlm_lock_limit_mb = watermark;
if (watermark != 0) {
watermark <<= 20;
do_div(watermark, LDLM_LOCK_MEM_OVERHEAD);
}
ldlm_lock_limit = watermark;
return count;
}
LUSTRE_RW_ATTR(lock_limit_mb);
static ssize_t lock_granted_count_show(struct kobject *kobj,
struct attribute *attr,
char *buf)
{
u64 sum = percpu_counter_sum_positive(&ldlm_granted_total);
return scnprintf(buf, PAGE_SIZE, "%llu\n", sum);
}
LUSTRE_RO_ATTR(lock_granted_count);
static ssize_t lock_limit_count_show(struct kobject *kobj,
struct attribute *attr,
char *buf)
{
return scnprintf(buf, PAGE_SIZE, "%llu\n", ldlm_lock_limit);
}
LUSTRE_RO_ATTR(lock_limit_count);
static ssize_t lock_reclaim_threshold_count_show(struct kobject *kobj,
struct attribute *attr,
char *buf)
{
return scnprintf(buf, PAGE_SIZE, "%llu\n", ldlm_reclaim_threshold);
}
LUSTRE_RO_ATTR(lock_reclaim_threshold_count);
#endif
static ssize_t ldlm_enqueue_min_show(struct kobject *kobj,
struct attribute *attr,
char *buf)
{
return scnprintf(buf, PAGE_SIZE, "%u\n", ldlm_enqueue_min);
}
LUSTRE_RO_ATTR(ldlm_enqueue_min);
static struct attribute *ldlm_attrs[] = {
&lustre_attr_dump_granted_max.attr,
&lustre_attr_cancel_unused_locks_before_replay.attr,
#ifdef CONFIG_LUSTRE_FS_SERVER
&lustre_attr_lock_reclaim_threshold_mb.attr,
&lustre_attr_lock_reclaim_threshold_count.attr,
&lustre_attr_lock_limit_mb.attr,
&lustre_attr_lock_limit_count.attr,
&lustre_attr_lock_granted_count.attr,
#endif
&lustre_attr_ldlm_enqueue_min.attr,
NULL,
};
static struct attribute_group ldlm_attr_group = {
.attrs = ldlm_attrs,
};
static int ldlm_setup(void)
{
static struct ptlrpc_service_conf conf;
struct ldlm_bl_pool *blp = NULL;
#ifdef CONFIG_LUSTRE_FS_SERVER
struct task_struct *task;
#endif /* CONFIG_LUSTRE_FS_SERVER */
int i;
int rc = 0;
ENTRY;
if (ldlm_state != NULL)
RETURN(-EALREADY);
OBD_ALLOC(ldlm_state, sizeof(*ldlm_state));
if (ldlm_state == NULL)
RETURN(-ENOMEM);
ldlm_kobj = kobject_create_and_add("ldlm", &lustre_kset->kobj);
if (!ldlm_kobj)
GOTO(out, -ENOMEM);
rc = sysfs_create_group(ldlm_kobj, &ldlm_attr_group);
if (rc)
GOTO(out, rc);
ldlm_ns_kset = kset_create_and_add("namespaces", NULL, ldlm_kobj);
if (!ldlm_ns_kset)
GOTO(out, -ENOMEM);
ldlm_svc_kset = kset_create_and_add("services", NULL, ldlm_kobj);
if (!ldlm_svc_kset)
GOTO(out, -ENOMEM);
rc = ldlm_debugfs_setup();
if (rc != 0)
GOTO(out, rc);
memset(&conf, 0, sizeof(conf));
conf = (typeof(conf)) {
.psc_name = "ldlm_cbd",
.psc_watchdog_factor = 2,
.psc_buf = {
.bc_nbufs = LDLM_CLIENT_NBUFS,
.bc_buf_size = LDLM_BUFSIZE,
.bc_req_max_size = LDLM_MAXREQSIZE,
.bc_rep_max_size = LDLM_MAXREPSIZE,
.bc_req_portal = LDLM_CB_REQUEST_PORTAL,
.bc_rep_portal = LDLM_CB_REPLY_PORTAL,
},
.psc_thr = {
.tc_thr_name = "ldlm_cb",
.tc_thr_factor = LDLM_THR_FACTOR,
.tc_nthrs_init = LDLM_NTHRS_INIT,
.tc_nthrs_base = LDLM_NTHRS_BASE,
.tc_nthrs_max = LDLM_NTHRS_MAX,
.tc_nthrs_user = ldlm_num_threads,
.tc_cpu_bind = ldlm_cpu_bind,
.tc_ctx_tags = LCT_MD_THREAD | LCT_DT_THREAD,
},
.psc_cpt = {
.cc_pattern = ldlm_cpts,
.cc_affinity = true,
},
.psc_ops = {
.so_req_handler = ldlm_callback_handler,
},
};
ldlm_state->ldlm_cb_service = ptlrpc_register_service(&conf,
ldlm_svc_kset,
ldlm_svc_debugfs_dir);
if (IS_ERR(ldlm_state->ldlm_cb_service)) {
CERROR("failed to start service\n");
rc = PTR_ERR(ldlm_state->ldlm_cb_service);
ldlm_state->ldlm_cb_service = NULL;
GOTO(out, rc);
}
#ifdef CONFIG_LUSTRE_FS_SERVER
memset(&conf, 0, sizeof(conf));
conf = (typeof(conf)) {
.psc_name = "ldlm_canceld",
.psc_watchdog_factor = 6,
.psc_buf = {
.bc_nbufs = LDLM_SERVER_NBUFS,
.bc_buf_size = LDLM_BUFSIZE,
.bc_req_max_size = LDLM_MAXREQSIZE,
.bc_rep_max_size = LDLM_MAXREPSIZE,
.bc_req_portal = LDLM_CANCEL_REQUEST_PORTAL,
.bc_rep_portal = LDLM_CANCEL_REPLY_PORTAL,
},
.psc_thr = {
.tc_thr_name = "ldlm_cn",
.tc_thr_factor = LDLM_THR_FACTOR,
.tc_nthrs_init = LDLM_NTHRS_INIT,
.tc_nthrs_base = LDLM_NTHRS_BASE,
.tc_nthrs_max = LDLM_NTHRS_MAX,
.tc_nthrs_user = ldlm_num_threads,
.tc_cpu_bind = ldlm_cpu_bind,
.tc_ctx_tags = LCT_MD_THREAD |
LCT_DT_THREAD |
LCT_CL_THREAD,
},
.psc_cpt = {
.cc_pattern = ldlm_cpts,
.cc_affinity = true,
},
.psc_ops = {
.so_req_handler = ldlm_cancel_handler,
.so_hpreq_handler = ldlm_hpreq_handler,
},
};
ldlm_state->ldlm_cancel_service =
ptlrpc_register_service(&conf, ldlm_svc_kset,
ldlm_svc_debugfs_dir);
if (IS_ERR(ldlm_state->ldlm_cancel_service)) {
CERROR("failed to start service\n");
rc = PTR_ERR(ldlm_state->ldlm_cancel_service);
ldlm_state->ldlm_cancel_service = NULL;
GOTO(out, rc);
}
#endif /* CONFIG_LUSTRE_FS_SERVER */
OBD_ALLOC(blp, sizeof(*blp));
if (blp == NULL)
GOTO(out, rc = -ENOMEM);
ldlm_state->ldlm_bl_pool = blp;
spin_lock_init(&blp->blp_lock);
INIT_LIST_HEAD(&blp->blp_list);
INIT_LIST_HEAD(&blp->blp_prio_list);
init_waitqueue_head(&blp->blp_waitq);
atomic_set(&blp->blp_num_threads, 0);
atomic_set(&blp->blp_busy_threads, 0);
blp->blp_total_locks = 0;
blp->blp_total_blwis = 0;
if (ldlm_num_threads == 0) {
blp->blp_min_threads = LDLM_NTHRS_INIT;
blp->blp_max_threads = LDLM_NTHRS_MAX;
} else {
blp->blp_min_threads = blp->blp_max_threads =
min_t(int, LDLM_NTHRS_MAX, max_t(int, LDLM_NTHRS_INIT,
ldlm_num_threads));
}
for (i = 0; i < blp->blp_min_threads; i++) {
rc = ldlm_bl_thread_start(blp, false);
if (rc < 0)
GOTO(out, rc);
}
#ifdef CONFIG_LUSTRE_FS_SERVER
task = kthread_run(expired_lock_main, NULL, "ldlm_elt");
if (IS_ERR(task)) {
rc = PTR_ERR(task);
CERROR("Cannot start ldlm expired-lock thread: %d\n", rc);
GOTO(out, rc);
}
wait_event(expired_lock_wait_queue,
expired_lock_thread_state == ELT_READY);
#endif /* CONFIG_LUSTRE_FS_SERVER */
rc = ldlm_pools_init();
if (rc) {
CERROR("Failed to initialize LDLM pools: %d\n", rc);
GOTO(out, rc);
}
rc = ldlm_reclaim_setup();
if (rc) {
CERROR("Failed to setup reclaim thread: rc = %d\n", rc);
GOTO(out, rc);
}
RETURN(0);
out:
ldlm_cleanup();
RETURN(rc);
}
static int ldlm_cleanup(void)
{
ENTRY;
if (!list_empty(ldlm_namespace_list(LDLM_NAMESPACE_SERVER)) ||
!list_empty(ldlm_namespace_list(LDLM_NAMESPACE_CLIENT))) {
CERROR("ldlm still has namespaces; clean these up first.\n");
ldlm_dump_all_namespaces(LDLM_NAMESPACE_SERVER, D_DLMTRACE);
ldlm_dump_all_namespaces(LDLM_NAMESPACE_CLIENT, D_DLMTRACE);
RETURN(-EBUSY);
}
ldlm_reclaim_cleanup();
ldlm_pools_fini();
if (ldlm_state->ldlm_bl_pool != NULL) {
struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool;
while (atomic_read(&blp->blp_num_threads) > 0) {
struct ldlm_bl_work_item blwi = { .blwi_ns = NULL };
init_completion(&blp->blp_comp);
spin_lock(&blp->blp_lock);
list_add_tail(&blwi.blwi_entry, &blp->blp_list);
wake_up(&blp->blp_waitq);
spin_unlock(&blp->blp_lock);
wait_for_completion(&blp->blp_comp);
}
OBD_FREE(blp, sizeof(*blp));
}
if (ldlm_state->ldlm_cb_service != NULL)
ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
#ifdef CONFIG_LUSTRE_FS_SERVER
if (ldlm_state->ldlm_cancel_service != NULL)
ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service);
#endif
if (ldlm_ns_kset)
kset_unregister(ldlm_ns_kset);
if (ldlm_svc_kset)
kset_unregister(ldlm_svc_kset);
if (ldlm_kobj) {
sysfs_remove_group(ldlm_kobj, &ldlm_attr_group);
kobject_put(ldlm_kobj);
}
ldlm_debugfs_cleanup();
#ifdef CONFIG_LUSTRE_FS_SERVER
if (expired_lock_thread_state != ELT_STOPPED) {
expired_lock_thread_state = ELT_TERMINATE;
wake_up(&expired_lock_wait_queue);
wait_event(expired_lock_wait_queue,
expired_lock_thread_state == ELT_STOPPED);
}
#endif
OBD_FREE(ldlm_state, sizeof(*ldlm_state));
ldlm_state = NULL;
RETURN(0);
}
int ldlm_init(void)
{
BUILD_BUG_ON(LDLM_TYPE_END > (1 << 4 /* lr_type bits */));
BUILD_BUG_ON(LVB_T_END > (1 << 3 /* l_lvb_type bits */));
BUILD_BUG_ON(LCK_MODE_END > (1 << 9 /* l_req_mode/l_granted_mode */));
ldlm_resource_slab = kmem_cache_create("ldlm_resources",
sizeof(struct ldlm_resource), 0,
SLAB_HWCACHE_ALIGN, NULL);
if (ldlm_resource_slab == NULL)
return -ENOMEM;
ldlm_lock_slab = kmem_cache_create("ldlm_locks",
sizeof(struct ldlm_lock), 0,
SLAB_HWCACHE_ALIGN, NULL);
if (ldlm_lock_slab == NULL)
goto out_resource;
ldlm_interval_tree_slab = kmem_cache_create("interval_tree",
sizeof(struct ldlm_interval_tree) * LCK_MODE_NUM,
0, SLAB_HWCACHE_ALIGN, NULL);
if (ldlm_interval_tree_slab == NULL)
goto out_lock_slab;
#ifdef CONFIG_LUSTRE_FS_SERVER
ldlm_inodebits_slab = kmem_cache_create("ldlm_ibits_node",
sizeof(struct ldlm_ibits_node),
0, SLAB_HWCACHE_ALIGN, NULL);
if (ldlm_inodebits_slab == NULL)
goto out_interval_tree;
ldlm_glimpse_work_kmem = kmem_cache_create("ldlm_glimpse_work_kmem",
sizeof(struct ldlm_glimpse_work),
0, 0, NULL);
if (ldlm_glimpse_work_kmem == NULL)
goto out_inodebits;
#endif
#if LUSTRE_TRACKS_LOCK_EXP_REFS
class_export_dump_hook = ldlm_dump_export_locks;
#endif
return 0;
#ifdef CONFIG_LUSTRE_FS_SERVER
out_inodebits:
kmem_cache_destroy(ldlm_inodebits_slab);
out_interval_tree:
kmem_cache_destroy(ldlm_interval_tree_slab);
#endif
out_lock_slab:
kmem_cache_destroy(ldlm_lock_slab);
out_resource:
kmem_cache_destroy(ldlm_resource_slab);
return -ENOMEM;
}
void ldlm_exit(void)
{
if (ldlm_refcount)
CERROR("ldlm_refcount is %d in %s\n", ldlm_refcount, __func__);
rcu_barrier();
kmem_cache_destroy(ldlm_resource_slab);
/*
* ldlm_lock_put() use RCU to call ldlm_lock_free, so need call
* rcu_barrier() to wait all outstanding RCU callbacks to complete,
* so that ldlm_lock_free() get a chance to be called.
*/
rcu_barrier();
kmem_cache_destroy(ldlm_lock_slab);
kmem_cache_destroy(ldlm_interval_tree_slab);
#ifdef CONFIG_LUSTRE_FS_SERVER
kmem_cache_destroy(ldlm_inodebits_slab);
kmem_cache_destroy(ldlm_glimpse_work_kmem);
#endif
}
