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Vitaly Fertman authoredb=15904 i=wangdi i=shadow clean log_commit_master properly at cleanup in llog_commit_thread()
Vitaly Fertman authoredb=15904 i=wangdi i=shadow clean log_commit_master properly at cleanup in llog_commit_thread()
recov_thread.c 23.15 KiB
/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=8:tabstop=8:
*
* Copyright (C) 2003 Cluster File Systems, Inc.
* Author: Andreas Dilger <adilger@clusterfs.com>
*
* This file is part of the Lustre file system, http://www.lustre.org
* Lustre is a trademark of Cluster File Systems, Inc.
*
* You may have signed or agreed to another license before downloading
* this software. If so, you are bound by the terms and conditions
* of that agreement, and the following does not apply to you. See the
* LICENSE file included with this distribution for more information.
*
* If you did not agree to a different license, then this copy of Lustre
* is open source software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* In either case, Lustre is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* license text for more details.
*
* OST<->MDS recovery logging thread.
*
* Invariants in implementation:
* - we do not share logs among different OST<->MDS connections, so that
* if an OST or MDS fails it need only look at log(s) relevant to itself
*/
#define DEBUG_SUBSYSTEM S_LOG
#ifndef EXPORT_SYMTAB
# define EXPORT_SYMTAB
#endif
#ifdef __KERNEL__
# include <libcfs/libcfs.h>
#else
# include <libcfs/list.h>
# include <liblustre.h>
#endif
#include <libcfs/kp30.h>
#include <obd_class.h>
#include <lustre_commit_confd.h>
#include <obd_support.h>
#include <obd_class.h>
#include <lustre_net.h>
#include <lnet/types.h>
#include <libcfs/list.h>
#include <lustre_log.h>
#include "ptlrpc_internal.h"
#ifdef __KERNEL__
/* Allocate new commit structs in case we do not have enough.
* Make the llcd size small enough that it fits into a single page when we
* are sending/receiving it. */
static int llcd_alloc(struct llog_commit_master *lcm)
{
struct llog_canceld_ctxt *llcd;
int llcd_size;
/* payload of lustre_msg V2 is bigger */
llcd_size = 4096 - lustre_msg_size(LUSTRE_MSG_MAGIC_V2, 1, NULL);
OBD_ALLOC(llcd,
llcd_size + offsetof(struct llog_canceld_ctxt, llcd_cookies));
if (llcd == NULL) return -ENOMEM;
llcd->llcd_size = llcd_size;
llcd->llcd_lcm = lcm;
spin_lock(&lcm->lcm_llcd_lock);
list_add(&llcd->llcd_list, &lcm->lcm_llcd_free);
atomic_inc(&lcm->lcm_llcd_numfree);
spin_unlock(&lcm->lcm_llcd_lock);
return 0;
}
/* Get a free cookie struct from the list */
static struct llog_canceld_ctxt *llcd_grab(struct llog_commit_master *lcm)
{
struct llog_canceld_ctxt *llcd;
repeat:
spin_lock(&lcm->lcm_llcd_lock);
if (list_empty(&lcm->lcm_llcd_free)) {
spin_unlock(&lcm->lcm_llcd_lock);
if (llcd_alloc(lcm) < 0) {
CERROR("unable to allocate log commit data!\n");
return NULL;
}
/* check new llcd wasn't grabbed while lock dropped, b=7407 */
goto repeat;
}
llcd = list_entry(lcm->lcm_llcd_free.next, typeof(*llcd), llcd_list);
list_del(&llcd->llcd_list);
atomic_dec(&lcm->lcm_llcd_numfree);
spin_unlock(&lcm->lcm_llcd_lock);
llcd->llcd_cookiebytes = 0;
return llcd;
}
static void llcd_put(struct llog_canceld_ctxt *llcd)
{
struct llog_commit_master *lcm = llcd->llcd_lcm;
llog_ctxt_put(llcd->llcd_ctxt);
if (atomic_read(&lcm->lcm_llcd_numfree) >= lcm->lcm_llcd_maxfree) {
int llcd_size = llcd->llcd_size +
offsetof(struct llog_canceld_ctxt, llcd_cookies);
OBD_FREE(llcd, llcd_size);
} else {
spin_lock(&lcm->lcm_llcd_lock);
list_add(&llcd->llcd_list, &lcm->lcm_llcd_free);
atomic_inc(&lcm->lcm_llcd_numfree);
spin_unlock(&lcm->lcm_llcd_lock);
}
}
/* Send some cookies to the appropriate target */
static void llcd_send(struct llog_canceld_ctxt *llcd)
{
if (!(llcd->llcd_lcm->lcm_flags & LLOG_LCM_FL_EXIT)) {
spin_lock(&llcd->llcd_lcm->lcm_llcd_lock);
list_add_tail(&llcd->llcd_list,
&llcd->llcd_lcm->lcm_llcd_pending);
spin_unlock(&llcd->llcd_lcm->lcm_llcd_lock);
}
cfs_waitq_signal_nr(&llcd->llcd_lcm->lcm_waitq, 1);
}
/* deleted objects have a commit callback that cancels the MDS * log record for the deletion. The commit callback calls this
* function
*/
int llog_obd_repl_cancel(struct llog_ctxt *ctxt,
struct lov_stripe_md *lsm, int count,
struct llog_cookie *cookies, int flags)
{
struct llog_canceld_ctxt *llcd;
int rc = 0;
ENTRY;
LASSERT(ctxt);
mutex_down(&ctxt->loc_sem);
if (ctxt->loc_imp == NULL) {
CDEBUG(D_RPCTRACE, "no import for ctxt %p\n", ctxt);
GOTO(out, rc = 0);
}
llcd = ctxt->loc_llcd;
if (count > 0 && cookies != NULL) {
if (llcd == NULL) {
llcd = llcd_grab(ctxt->loc_lcm);
if (llcd == NULL) {
CERROR("couldn't get an llcd - dropped "LPX64
":%x+%u\n",
cookies->lgc_lgl.lgl_oid,
cookies->lgc_lgl.lgl_ogen,
cookies->lgc_index);
GOTO(out, rc = -ENOMEM);
}
llcd->llcd_ctxt = llog_ctxt_get(ctxt);
ctxt->loc_llcd = llcd;
}
memcpy((char *)llcd->llcd_cookies + llcd->llcd_cookiebytes,
cookies, sizeof(*cookies));
llcd->llcd_cookiebytes += sizeof(*cookies);
} else {
if (llcd == NULL || !(flags & OBD_LLOG_FL_SENDNOW))
GOTO(out, rc);
}
if ((llcd->llcd_size - llcd->llcd_cookiebytes) < sizeof(*cookies) ||
(flags & OBD_LLOG_FL_SENDNOW)) {
CDEBUG(D_RPCTRACE, "send llcd %p:%p\n", llcd, llcd->llcd_ctxt);
ctxt->loc_llcd = NULL;
llcd_send(llcd);
}
out:
mutex_up(&ctxt->loc_sem);
return rc;
}
EXPORT_SYMBOL(llog_obd_repl_cancel);
int llog_obd_repl_sync(struct llog_ctxt *ctxt, struct obd_export *exp)
{
int rc = 0;
ENTRY;
if (exp && (ctxt->loc_imp == exp->exp_imp_reverse)) {
CDEBUG(D_RPCTRACE,"reverse import disconnect, put llcd %p:%p\n",
ctxt->loc_llcd, ctxt);
mutex_down(&ctxt->loc_sem);
if (ctxt->loc_llcd != NULL) {
llcd_put(ctxt->loc_llcd);
ctxt->loc_llcd = NULL;
}
ctxt->loc_imp = NULL; mutex_up(&ctxt->loc_sem);
} else {
rc = llog_cancel(ctxt, NULL, 0, NULL, OBD_LLOG_FL_SENDNOW);
}
RETURN(rc);
}
EXPORT_SYMBOL(llog_obd_repl_sync);
static inline void stop_log_commit(struct llog_commit_master *lcm,
struct llog_commit_daemon *lcd,
int rc)
{
CERROR("error preparing commit: rc %d\n", rc);
spin_lock(&lcm->lcm_llcd_lock);
list_splice_init(&lcd->lcd_llcd_list, &lcm->lcm_llcd_resend);
spin_unlock(&lcm->lcm_llcd_lock);
}
static int log_commit_thread(void *arg)
{
struct llog_commit_master *lcm = arg;
struct llog_commit_daemon *lcd;
struct llog_canceld_ctxt *llcd, *n;
struct obd_import *import = NULL;
ENTRY;
OBD_ALLOC(lcd, sizeof(*lcd));
if (lcd == NULL)
RETURN(-ENOMEM);
spin_lock(&lcm->lcm_thread_lock);
THREAD_NAME(cfs_curproc_comm(), CFS_CURPROC_COMM_MAX - 1,
"ll_log_comt_%02d", atomic_read(&lcm->lcm_thread_total));
atomic_inc(&lcm->lcm_thread_total);
spin_unlock(&lcm->lcm_thread_lock);
ptlrpc_daemonize(cfs_curproc_comm()); /* thread never needs to do IO */
CFS_INIT_LIST_HEAD(&lcd->lcd_lcm_list);
CFS_INIT_LIST_HEAD(&lcd->lcd_llcd_list);
lcd->lcd_lcm = lcm;
CDEBUG(D_HA, "%s started\n", cfs_curproc_comm());
do {
struct ptlrpc_request *request;
struct list_head *sending_list;
int rc = 0;
if (import)
class_import_put(import);
import = NULL;
/* If we do not have enough pages available, allocate some */
while (atomic_read(&lcm->lcm_llcd_numfree) <
lcm->lcm_llcd_minfree) {
if (llcd_alloc(lcm) < 0)
break;
}
spin_lock(&lcm->lcm_thread_lock);
atomic_inc(&lcm->lcm_thread_numidle);
list_move(&lcd->lcd_lcm_list, &lcm->lcm_thread_idle);
spin_unlock(&lcm->lcm_thread_lock);
wait_event_interruptible(lcm->lcm_waitq,
!list_empty(&lcm->lcm_llcd_pending) ||
lcm->lcm_flags & LLOG_LCM_FL_EXIT);
/* If we are the last available thread, start a new one in case
* we get blocked on an RPC (nobody else will start a new one)*/
spin_lock(&lcm->lcm_thread_lock);
atomic_dec(&lcm->lcm_thread_numidle);
list_move(&lcd->lcd_lcm_list, &lcm->lcm_thread_busy);
spin_unlock(&lcm->lcm_thread_lock);
sending_list = &lcm->lcm_llcd_pending;
resend:
if (import)
class_import_put(import);
import = NULL;
if (lcm->lcm_flags & LLOG_LCM_FL_EXIT) {
lcm->lcm_llcd_maxfree = 0;
lcm->lcm_llcd_minfree = 0;
lcm->lcm_thread_max = 0;
if (list_empty(&lcm->lcm_llcd_pending) ||
lcm->lcm_flags & LLOG_LCM_FL_EXIT_FORCE)
break;
}
if (atomic_read(&lcm->lcm_thread_numidle) <= 1 &&
atomic_read(&lcm->lcm_thread_total) < lcm->lcm_thread_max) {
rc = llog_start_commit_thread(lcm);
if (rc < 0)
CERROR("error starting thread: rc %d\n", rc);
}
/* Move all of the pending cancels from the same OST off of
* the list, so we don't get multiple threads blocked and/or
* doing upcalls on the same OST in case of failure. */
spin_lock(&lcm->lcm_llcd_lock);
if (!list_empty(sending_list)) {
list_move_tail(sending_list->next,
&lcd->lcd_llcd_list);
llcd = list_entry(lcd->lcd_llcd_list.next,
typeof(*llcd), llcd_list);
LASSERT(llcd->llcd_lcm == lcm);
import = llcd->llcd_ctxt->loc_imp;
if (import)
class_import_get(import);
}
list_for_each_entry_safe(llcd, n, sending_list, llcd_list) {
LASSERT(llcd->llcd_lcm == lcm);
if (import == llcd->llcd_ctxt->loc_imp)
list_move_tail(&llcd->llcd_list,
&lcd->lcd_llcd_list);
}
if (sending_list != &lcm->lcm_llcd_resend) {
list_for_each_entry_safe(llcd, n, &lcm->lcm_llcd_resend,
llcd_list) {
LASSERT(llcd->llcd_lcm == lcm);
if (import == llcd->llcd_ctxt->loc_imp)
list_move_tail(&llcd->llcd_list,
&lcd->lcd_llcd_list);
}
}
spin_unlock(&lcm->lcm_llcd_lock);
/* We are the only one manipulating our local list - no lock */
list_for_each_entry_safe(llcd,n, &lcd->lcd_llcd_list,llcd_list){
char *bufs[2] = { NULL, (char *)llcd->llcd_cookies };
list_del(&llcd->llcd_list);
if (llcd->llcd_cookiebytes == 0) {
CDEBUG(D_RPCTRACE, "put empty llcd %p:%p\n",
llcd, llcd->llcd_ctxt);
llcd_put(llcd);
continue; }
mutex_down(&llcd->llcd_ctxt->loc_sem);
if (llcd->llcd_ctxt->loc_imp == NULL) {
mutex_up(&llcd->llcd_ctxt->loc_sem);
CWARN("import will be destroyed, put "
"llcd %p:%p\n", llcd, llcd->llcd_ctxt);
llcd_put(llcd);
continue;
}
mutex_up(&llcd->llcd_ctxt->loc_sem);
if (!import || (import == LP_POISON) ||
(import->imp_client == LP_POISON)) {
CERROR("No import %p (llcd=%p, ctxt=%p)\n",
import, llcd, llcd->llcd_ctxt);
llcd_put(llcd);
continue;
}
OBD_FAIL_TIMEOUT(OBD_FAIL_PTLRPC_DELAY_RECOV, 10);
request = ptlrpc_request_alloc(import, &RQF_LOG_CANCEL);
if (request == NULL) {
rc = -ENOMEM;
stop_log_commit(lcm, lcd, rc);
break;
}
req_capsule_set_size(&request->rq_pill, &RMF_LOGCOOKIES,
RCL_CLIENT,llcd->llcd_cookiebytes);
rc = ptlrpc_request_bufs_pack(request,
LUSTRE_LOG_VERSION,
OBD_LOG_CANCEL, bufs,
NULL);
if (rc) {
ptlrpc_request_free(request);
stop_log_commit(lcm, lcd, rc);
break;
}
/* XXX FIXME bug 249, 5515 */
request->rq_request_portal = LDLM_CANCEL_REQUEST_PORTAL;
request->rq_reply_portal = LDLM_CANCEL_REPLY_PORTAL;
ptlrpc_request_set_replen(request);
mutex_down(&llcd->llcd_ctxt->loc_sem);
if (llcd->llcd_ctxt->loc_imp == NULL) {
mutex_up(&llcd->llcd_ctxt->loc_sem);
CWARN("import will be destroyed, put "
"llcd %p:%p\n", llcd, llcd->llcd_ctxt);
llcd_put(llcd);
ptlrpc_req_finished(request);
continue;
}
mutex_up(&llcd->llcd_ctxt->loc_sem);
rc = ptlrpc_queue_wait(request);
ptlrpc_req_finished(request);
/* If the RPC failed, we put this and the remaining
* messages onto the resend list for another time. */
if (rc == 0) {
llcd_put(llcd);
continue;
}
CERROR("commit %p:%p drop %d cookies: rc %d\n",
llcd, llcd->llcd_ctxt,
(int)(llcd->llcd_cookiebytes / sizeof(*llcd->llcd_cookies)), rc);
llcd_put(llcd);
}
if (rc == 0) {
sending_list = &lcm->lcm_llcd_resend;
if (!list_empty(sending_list))
goto resend;
}
} while(1);
if (import)
class_import_put(import);
/* If we are force exiting, just drop all of the cookies. */
if (lcm->lcm_flags & LLOG_LCM_FL_EXIT_FORCE) {
spin_lock(&lcm->lcm_llcd_lock);
list_splice_init(&lcm->lcm_llcd_pending, &lcd->lcd_llcd_list);
list_splice_init(&lcm->lcm_llcd_resend, &lcd->lcd_llcd_list);
list_splice_init(&lcm->lcm_llcd_free, &lcd->lcd_llcd_list);
spin_unlock(&lcm->lcm_llcd_lock);
list_for_each_entry_safe(llcd, n, &lcd->lcd_llcd_list,llcd_list)
llcd_put(llcd);
}
spin_lock(&lcm->lcm_thread_lock);
list_del(&lcd->lcd_lcm_list);
spin_unlock(&lcm->lcm_thread_lock);
OBD_FREE(lcd, sizeof(*lcd));
CDEBUG(D_HA, "%s exiting\n", cfs_curproc_comm());
spin_lock(&lcm->lcm_thread_lock);
atomic_dec(&lcm->lcm_thread_total);
spin_unlock(&lcm->lcm_thread_lock);
cfs_waitq_signal(&lcm->lcm_waitq);
return 0;
}
int llog_start_commit_thread(struct llog_commit_master *lcm)
{
int rc;
ENTRY;
if (atomic_read(&lcm->lcm_thread_total) >= lcm->lcm_thread_max)
RETURN(0);
rc = cfs_kernel_thread(log_commit_thread, lcm, CLONE_VM | CLONE_FILES);
if (rc < 0) {
CERROR("error starting thread #%d: %d\n",
atomic_read(&lcm->lcm_thread_total), rc);
RETURN(rc);
}
RETURN(0);
}
EXPORT_SYMBOL(llog_start_commit_thread);
static struct llog_process_args {
struct semaphore llpa_sem;
struct llog_ctxt *llpa_ctxt;
void *llpa_cb;
void *llpa_arg;
} llpa;
int llog_init_commit_master(struct llog_commit_master *lcm)
{
CFS_INIT_LIST_HEAD(&lcm->lcm_thread_busy); CFS_INIT_LIST_HEAD(&lcm->lcm_thread_idle);
spin_lock_init(&lcm->lcm_thread_lock);
atomic_set(&lcm->lcm_thread_numidle, 0);
cfs_waitq_init(&lcm->lcm_waitq);
CFS_INIT_LIST_HEAD(&lcm->lcm_llcd_pending);
CFS_INIT_LIST_HEAD(&lcm->lcm_llcd_resend);
CFS_INIT_LIST_HEAD(&lcm->lcm_llcd_free);
spin_lock_init(&lcm->lcm_llcd_lock);
atomic_set(&lcm->lcm_llcd_numfree, 0);
lcm->lcm_llcd_minfree = 0;
lcm->lcm_thread_max = 5;
/* FIXME initialize semaphore for llog_process_args */
sema_init(&llpa.llpa_sem, 1);
return 0;
}
EXPORT_SYMBOL(llog_init_commit_master);
int llog_cleanup_commit_master(struct llog_commit_master *lcm,
int force)
{
lcm->lcm_flags |= LLOG_LCM_FL_EXIT;
if (force)
lcm->lcm_flags |= LLOG_LCM_FL_EXIT_FORCE;
cfs_waitq_signal(&lcm->lcm_waitq);
wait_event_interruptible(lcm->lcm_waitq,
atomic_read(&lcm->lcm_thread_total) == 0);
return 0;
}
EXPORT_SYMBOL(llog_cleanup_commit_master);
static int log_process_thread(void *args)
{
struct llog_process_args *data = args;
struct llog_ctxt *ctxt = data->llpa_ctxt;
void *cb = data->llpa_cb;
struct llog_logid logid = *(struct llog_logid *)(data->llpa_arg);
struct llog_handle *llh = NULL;
int rc;
ENTRY;
mutex_up(&data->llpa_sem);
ptlrpc_daemonize("llog_process"); /* thread does IO to log files */
rc = llog_create(ctxt, &llh, &logid, NULL);
if (rc) {
CERROR("llog_create failed %d\n", rc);
GOTO(out, rc);
}
rc = llog_init_handle(llh, LLOG_F_IS_CAT, NULL);
if (rc) {
CERROR("llog_init_handle failed %d\n", rc);
GOTO(release_llh, rc);
}
if (cb) {
rc = llog_cat_process(llh, (llog_cb_t)cb, NULL);
if (rc != LLOG_PROC_BREAK)
CERROR("llog_cat_process failed %d\n", rc);
} else {
CWARN("no callback function for recovery\n");
}
CDEBUG(D_HA, "send llcd %p:%p forcibly after recovery\n",
ctxt->loc_llcd, ctxt);
llog_sync(ctxt, NULL);
release_llh:
rc = llog_cat_put(llh);
if (rc) CERROR("llog_cat_put failed %d\n", rc);
out:
llog_ctxt_put(ctxt);
RETURN(rc);
}
static int llog_recovery_generic(struct llog_ctxt *ctxt, void *handle,void *arg)
{
struct obd_device *obd = ctxt->loc_obd;
int rc;
ENTRY;
if (obd->obd_stopping)
RETURN(-ENODEV);
mutex_down(&llpa.llpa_sem);
llpa.llpa_cb = handle;
llpa.llpa_arg = arg;
llpa.llpa_ctxt = llog_ctxt_get(ctxt); //llog_group_get_ctxt(ctxt->loc_olg, ctxt->loc_idx);
if (!llpa.llpa_ctxt) {
up(&llpa.llpa_sem);
RETURN(-ENODEV);
}
rc = cfs_kernel_thread(log_process_thread, &llpa, CLONE_VM | CLONE_FILES);
if (rc < 0)
CERROR("error starting log_process_thread: %d\n", rc);
else {
CDEBUG(D_HA, "log_process_thread: %d\n", rc);
rc = 0;
}
RETURN(rc);
}
int llog_repl_connect(struct llog_ctxt *ctxt, int count,
struct llog_logid *logid, struct llog_gen *gen,
struct obd_uuid *uuid)
{
struct llog_canceld_ctxt *llcd;
int rc;
ENTRY;
/* send back llcd before recovery from llog */
if (ctxt->loc_llcd != NULL) {
CWARN("llcd %p:%p not empty\n", ctxt->loc_llcd, ctxt);
llog_sync(ctxt, NULL);
}
mutex_down(&ctxt->loc_sem);
ctxt->loc_gen = *gen;
llcd = llcd_grab(ctxt->loc_lcm);
if (llcd == NULL) {
CERROR("couldn't get an llcd\n");
mutex_up(&ctxt->loc_sem);
RETURN(-ENOMEM);
}
llcd->llcd_ctxt = llog_ctxt_get(ctxt);
ctxt->loc_llcd = llcd;
mutex_up(&ctxt->loc_sem);
rc = llog_recovery_generic(ctxt, ctxt->llog_proc_cb, logid);
if (rc != 0)
CERROR("error recovery process: %d\n", rc);
RETURN(rc);
}
EXPORT_SYMBOL(llog_repl_connect);
#else /* !__KERNEL__ */
int llog_obd_repl_cancel(struct llog_ctxt *ctxt,
struct lov_stripe_md *lsm, int count,
struct llog_cookie *cookies, int flags)
{
return 0;
}
#endif