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|
/*
* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 only,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is included
* in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; If not, see
* http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
* GPL HEADER END
*/
/*
* Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2010, 2012, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*
* lustre/ldlm/ldlm_lockd.c
*
* Author: Peter Braam <braam@clusterfs.com>
* Author: Phil Schwan <phil@clusterfs.com>
*/
#define DEBUG_SUBSYSTEM S_LDLM
# include <linux/libcfs/libcfs.h>
#include <lustre_dlm.h>
#include <obd_class.h>
#include <linux/list.h>
#include "ldlm_internal.h"
static int ldlm_num_threads;
CFS_MODULE_PARM(ldlm_num_threads, "i", int, 0444,
"number of DLM service threads to start");
static char *ldlm_cpts;
CFS_MODULE_PARM(ldlm_cpts, "s", charp, 0444,
"CPU partitions ldlm threads should run on");
extern struct kmem_cache *ldlm_resource_slab;
extern struct kmem_cache *ldlm_lock_slab;
static struct mutex ldlm_ref_mutex;
static int ldlm_refcount;
struct ldlm_cb_async_args {
struct ldlm_cb_set_arg *ca_set_arg;
struct ldlm_lock *ca_lock;
};
/* LDLM state */
static struct ldlm_state *ldlm_state;
inline cfs_time_t round_timeout(cfs_time_t timeout)
{
return cfs_time_seconds((int)cfs_duration_sec(cfs_time_sub(timeout, 0)) + 1);
}
/* timeout for initial callback (AST) reply (bz10399) */
static inline unsigned int ldlm_get_rq_timeout(void)
{
/* Non-AT value */
unsigned int timeout = min(ldlm_timeout, obd_timeout / 3);
return timeout < 1 ? 1 : timeout;
}
#define ELT_STOPPED 0
#define ELT_READY 1
#define ELT_TERMINATE 2
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 bug 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;
};
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;
ldlm_cancel_flags_t blwi_flags;
int blwi_mem_pressure;
};
int ldlm_del_waiting_lock(struct ldlm_lock *lock)
{
RETURN(0);
}
int ldlm_refresh_waiting_lock(struct ldlm_lock *lock, int timeout)
{
RETURN(0);
}
/**
* 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);
lock->l_flags |= LDLM_FL_CBPENDING;
if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK)
lock->l_flags |= LDLM_FL_CANCEL;
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);
}
LDLM_DEBUG(lock, "client blocking callback handler END");
LDLM_LOCK_RELEASE(lock);
EXIT;
}
/**
* Callback handler for receiving incoming completion ASTs.
*
* This only can happen on client side.
*/
static void ldlm_handle_cp_callback(struct ptlrpc_request *req,
struct ldlm_namespace *ns,
struct ldlm_request *dlm_req,
struct ldlm_lock *lock)
{
int lvb_len;
LIST_HEAD(ast_list);
int rc = 0;
ENTRY;
LDLM_DEBUG(lock, "client completion callback handler START");
if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_BL_CB_RACE)) {
int to = cfs_time_seconds(1);
while (to > 0) {
schedule_timeout_and_set_state(
TASK_INTERRUPTIBLE, to);
if (lock->l_granted_mode == lock->l_req_mode ||
lock->l_destroyed)
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 = %d, "
"replied = %d",
lock->l_lvb_len, lvb_len);
GOTO(out, rc = -EINVAL);
}
} else if (ldlm_has_layout(lock)) { /* for layout lock, lvb has
* variable length */
void *lvb_data;
OBD_ALLOC(lvb_data, lvb_len);
if (lvb_data == NULL) {
LDLM_ERROR(lock, "No memory: %d.\n", lvb_len);
GOTO(out, rc = -ENOMEM);
}
lock_res_and_lock(lock);
LASSERT(lock->l_lvb_data == NULL);
lock->l_lvb_data = lvb_data;
lock->l_lvb_len = lvb_len;
unlock_res_and_lock(lock);
}
}
lock_res_and_lock(lock);
if (lock->l_destroyed ||
lock->l_granted_mode == lock->l_req_mode) {
/* bug 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 (memcmp(&dlm_req->lock_desc.l_resource.lr_name,
&lock->l_resource->lr_name,
sizeof(lock->l_resource->lr_name)) != 0) {
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");
CERROR("change resource!\n");
lock_res_and_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);
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 */
OBD_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);
lock->l_flags |= LDLM_FL_FAILED;
unlock_res_and_lock(lock);
wake_up(&lock->l_waitq);
}
LDLM_LOCK_RELEASE(lock);
}
/**
* 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)
{
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 &&
cfs_time_after(cfs_time_current(),
cfs_time_add(lock->l_last_used,
cfs_time_seconds(10)))) {
unlock_res_and_lock(lock);
if (ldlm_bl_to_thread_lock(ns, NULL, lock))
ldlm_handle_bl_callback(ns, NULL, lock);
EXIT;
return;
}
unlock_res_and_lock(lock);
LDLM_LOCK_RELEASE(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);
}
static int __ldlm_bl_to_thread(struct ldlm_bl_work_item *blwi,
ldlm_cancel_flags_t cancel_flags)
{
struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool;
ENTRY;
spin_lock(&blp->blp_lock);
if (blwi->blwi_lock &&
blwi->blwi_lock->l_flags & LDLM_FL_DISCARD_DATA) {
/* add LDLM_FL_DISCARD_DATA requests to the priority list */
list_add_tail(&blwi->blwi_entry, &blp->blp_prio_list);
} else {
/* other blocking callbacks are added to the regular list */
list_add_tail(&blwi->blwi_entry, &blp->blp_list);
}
spin_unlock(&blp->blp_lock);
wake_up(&blp->blp_waitq);
/* 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,
ldlm_cancel_flags_t cancel_flags)
{
init_completion(&blwi->blwi_comp);
INIT_LIST_HEAD(&blwi->blwi_head);
if (memory_pressure_get())
blwi->blwi_mem_pressure = 1;
blwi->blwi_ns = ns;
blwi->blwi_flags = cancel_flags;
if (ld != NULL)
blwi->blwi_ld = *ld;
if (count) {
list_add(&blwi->blwi_head, cancels);
list_del_init(cancels);
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,
ldlm_cancel_flags_t 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,
ldlm_cancel_flags_t cancel_flags)
{
return ldlm_bl_to_thread(ns, ld, NULL, cancels, count, cancel_flags);
}
/* 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\n", 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,
struct lustre_handle *handle)
{
DEBUG_REQ((req->rq_no_reply || rc) ? D_WARNING : D_DLMTRACE, req,
"%s: [nid %s] [rc %d] [lock "LPX64"]",
msg, libcfs_id2str(req->rq_peer), rc,
handle ? handle->cookie : 0);
if (req->rq_no_reply)
CWARN("No reply was sent, maybe cause bug 21636.\n");
else if (rc)
CWARN("Send reply failed, maybe cause bug 21636.\n");
}
static int ldlm_handle_qc_callback(struct ptlrpc_request *req)
{
struct obd_quotactl *oqctl;
struct client_obd *cli = &req->rq_export->exp_obd->u.cli;
oqctl = req_capsule_client_get(&req->rq_pill, &RMF_OBD_QUOTACTL);
if (oqctl == NULL) {
CERROR("Can't unpack obd_quotactl\n");
RETURN(-EPROTO);
}
oqctl->qc_stat = ptlrpc_status_ntoh(oqctl->qc_stat);
cli->cl_qchk_stat = oqctl->qc_stat;
return 0;
}
/* 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 (OBD_FAIL_CHECK(OBD_FAIL_LDLM_BL_CALLBACK_NET))
RETURN(0);
break;
case LDLM_CP_CALLBACK:
if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CP_CALLBACK_NET))
RETURN(0);
break;
case LDLM_GL_CALLBACK:
if (OBD_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);
case OBD_LOG_CANCEL: /* remove this eventually - for 1.4.0 compat */
CERROR("shouldn't be handling OBD_LOG_CANCEL on DLM thread\n");
req_capsule_set(&req->rq_pill, &RQF_LOG_CANCEL);
if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOG_CANCEL_NET))
RETURN(0);
rc = llog_origin_handle_cancel(req);
if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOG_CANCEL_REP))
RETURN(0);
ldlm_callback_reply(req, rc);
RETURN(0);
case LLOG_ORIGIN_HANDLE_CREATE:
req_capsule_set(&req->rq_pill, &RQF_LLOG_ORIGIN_HANDLE_CREATE);
if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
RETURN(0);
rc = llog_origin_handle_open(req);
ldlm_callback_reply(req, rc);
RETURN(0);
case LLOG_ORIGIN_HANDLE_NEXT_BLOCK:
req_capsule_set(&req->rq_pill,
&RQF_LLOG_ORIGIN_HANDLE_NEXT_BLOCK);
if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
RETURN(0);
rc = llog_origin_handle_next_block(req);
ldlm_callback_reply(req, rc);
RETURN(0);
case LLOG_ORIGIN_HANDLE_READ_HEADER:
req_capsule_set(&req->rq_pill,
&RQF_LLOG_ORIGIN_HANDLE_READ_HEADER);
if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
RETURN(0);
rc = llog_origin_handle_read_header(req);
ldlm_callback_reply(req, rc);
RETURN(0);
case LLOG_ORIGIN_HANDLE_CLOSE:
if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET))
RETURN(0);
rc = llog_origin_handle_close(req);
ldlm_callback_reply(req, rc);
RETURN(0);
case OBD_QC_CALLBACK:
req_capsule_set(&req->rq_pill, &RQF_QC_CALLBACK);
if (OBD_FAIL_CHECK(OBD_FAIL_OBD_QC_CALLBACK_NET))
RETURN(0);
rc = ldlm_handle_qc_callback(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);
}
/* 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 (OBD_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 "LPX64" - 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 ((lock->l_flags & LDLM_FL_FAIL_LOC) &&
lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK)
OBD_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_AST_FLAGS);
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 (((lock->l_flags & LDLM_FL_CANCELING) &&
(lock->l_flags & LDLM_FL_BL_DONE)) ||
(lock->l_flags & LDLM_FL_FAILED)) {
LDLM_DEBUG(lock, "callback on lock "
LPX64" - lock disappeared\n",
dlm_req->lock_handle[0].cookie);
unlock_res_and_lock(lock);
LDLM_LOCK_RELEASE(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);
lock->l_flags |= LDLM_FL_BL_AST;
}
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:
CDEBUG(D_INODE, "blocking ast\n");
req_capsule_extend(&req->rq_pill, &RQF_LDLM_BL_CALLBACK);
if (!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK)) {
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:
CDEBUG(D_INODE, "completion ast\n");
req_capsule_extend(&req->rq_pill, &RQF_LDLM_CP_CALLBACK);
ldlm_callback_reply(req, 0);
ldlm_handle_cp_callback(req, ns, dlm_req, lock);
break;
case LDLM_GL_CALLBACK:
CDEBUG(D_INODE, "glimpse ast\n");
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);
}
static struct ldlm_bl_work_item *ldlm_bl_get_work(struct ldlm_bl_pool *blp)
{
struct ldlm_bl_work_item *blwi = NULL;
static unsigned int num_bl = 0;
spin_lock(&blp->blp_lock);
/* 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_entry(blp->blp_list.next,
struct ldlm_bl_work_item, blwi_entry);
else
if (!list_empty(&blp->blp_prio_list))
blwi = list_entry(blp->blp_prio_list.next,
struct ldlm_bl_work_item,
blwi_entry);
if (blwi) {
if (++num_bl >= atomic_read(&blp->blp_num_threads))
num_bl = 0;
list_del(&blwi->blwi_entry);
}
spin_unlock(&blp->blp_lock);
return blwi;
}
/* This only contains temporary data until the thread starts */
struct ldlm_bl_thread_data {
char bltd_name[CFS_CURPROC_COMM_MAX];
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)
{
struct ldlm_bl_thread_data bltd = { .bltd_blp = blp };
task_t *task;
init_completion(&bltd.bltd_comp);
bltd.bltd_num = atomic_read(&blp->blp_num_threads);
snprintf(bltd.bltd_name, sizeof(bltd.bltd_name) - 1,
"ldlm_bl_%02d", bltd.bltd_num);
task = kthread_run(ldlm_bl_thread_main, &bltd, bltd.bltd_name);
if (IS_ERR(task)) {
CERROR("cannot start LDLM thread ldlm_bl_%02d: rc %ld\n",
atomic_read(&blp->blp_num_threads), PTR_ERR(task));
return PTR_ERR(task);
}
wait_for_completion(&bltd.bltd_comp);
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 ldlm_bl_pool *blp;
ENTRY;
{
struct ldlm_bl_thread_data *bltd = arg;
blp = bltd->bltd_blp;
atomic_inc(&blp->blp_num_threads);
atomic_inc(&blp->blp_busy_threads);
complete(&bltd->bltd_comp);
/* cannot use bltd after this, it is only on caller's stack */
}
while (1) {
struct l_wait_info lwi = { 0 };
struct ldlm_bl_work_item *blwi = NULL;
int busy;
blwi = ldlm_bl_get_work(blp);
if (blwi == NULL) {
atomic_dec(&blp->blp_busy_threads);
l_wait_event_exclusive(blp->blp_waitq,
(blwi = ldlm_bl_get_work(blp)) != NULL,
&lwi);
busy = atomic_inc_return(&blp->blp_busy_threads);
} else {
busy = atomic_read(&blp->blp_busy_threads);
}
if (blwi->blwi_ns == NULL)
/* added by ldlm_cleanup() */
break;
/* Not fatal if racy and have a few too many threads */
if (unlikely(busy < blp->blp_max_threads &&
busy >= atomic_read(&blp->blp_num_threads) &&
!blwi->blwi_mem_pressure))
/* discard the return value, we tried */
ldlm_bl_thread_start(blp);
if (blwi->blwi_mem_pressure)
memory_pressure_set();
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,
LCF_BL_AST);
ldlm_cli_cancel_list(&blwi->blwi_head, count, NULL,
blwi->blwi_flags);
} else {
ldlm_handle_bl_callback(blwi->blwi_ns, &blwi->blwi_ld,
blwi->blwi_lock);
}
if (blwi->blwi_mem_pressure)
memory_pressure_clr();
if (blwi->blwi_flags & LCF_ASYNC)
OBD_FREE(blwi, sizeof(*blwi));
else
complete(&blwi->blwi_comp);
}
atomic_dec(&blp->blp_busy_threads);
atomic_dec(&blp->blp_num_threads);
complete(&blp->blp_comp);
RETURN(0);
}
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);
}
EXPORT_SYMBOL(ldlm_get_ref);
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_SYMBOL(ldlm_put_ref);
/*
* Export handle<->lock hash operations.
*/
static unsigned
ldlm_export_lock_hash(cfs_hash_t *hs, const void *key, unsigned mask)
{
return cfs_hash_u64_hash(((struct lustre_handle *)key)->cookie, mask);
}
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(cfs_hash_t *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(cfs_hash_t *hs, struct hlist_node *hnode)
{
struct ldlm_lock *lock;
lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash);
LDLM_LOCK_RELEASE(lock);
}
static cfs_hash_ops_t 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)
{
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);
RETURN(0);
}
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 int ldlm_setup(void)
{
static struct ptlrpc_service_conf conf;
struct ldlm_bl_pool *blp = NULL;
int rc = 0;
int i;
ENTRY;
if (ldlm_state != NULL)
RETURN(-EALREADY);
OBD_ALLOC(ldlm_state, sizeof(*ldlm_state));
if (ldlm_state == NULL)
RETURN(-ENOMEM);
#ifdef LPROCFS
rc = ldlm_proc_setup();
if (rc != 0)
GOTO(out, rc);
#endif
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_affinity = 1,
.tc_ctx_tags = LCT_MD_THREAD | LCT_DT_THREAD,
},
.psc_cpt = {
.cc_pattern = ldlm_cpts,
},
.psc_ops = {
.so_req_handler = ldlm_callback_handler,
},
};
ldlm_state->ldlm_cb_service = \
ptlrpc_register_service(&conf, ldlm_svc_proc_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);
}
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);
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);
if (rc < 0)
GOTO(out, rc);
}
rc = ldlm_pools_init();
if (rc) {
CERROR("Failed to initialize LDLM pools: %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_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);
ldlm_proc_cleanup();
OBD_FREE(ldlm_state, sizeof(*ldlm_state));
ldlm_state = NULL;
RETURN(0);
}
int ldlm_init(void)
{
mutex_init(&ldlm_ref_mutex);
mutex_init(ldlm_namespace_lock(LDLM_NAMESPACE_SERVER));
mutex_init(ldlm_namespace_lock(LDLM_NAMESPACE_CLIENT));
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 | SLAB_DESTROY_BY_RCU, NULL);
if (ldlm_lock_slab == NULL) {
kmem_cache_destroy(ldlm_resource_slab);
return -ENOMEM;
}
ldlm_interval_slab = kmem_cache_create("interval_node",
sizeof(struct ldlm_interval),
0, SLAB_HWCACHE_ALIGN, NULL);
if (ldlm_interval_slab == NULL) {
kmem_cache_destroy(ldlm_resource_slab);
kmem_cache_destroy(ldlm_lock_slab);
return -ENOMEM;
}
#if LUSTRE_TRACKS_LOCK_EXP_REFS
class_export_dump_hook = ldlm_dump_export_locks;
#endif
return 0;
}
void ldlm_exit(void)
{
if (ldlm_refcount)
CERROR("ldlm_refcount is %d in ldlm_exit!\n", ldlm_refcount);
kmem_cache_destroy(ldlm_resource_slab);
/* ldlm_lock_put() use RCU to call ldlm_lock_free, so need call
* synchronize_rcu() to wait a grace period elapsed, so that
* ldlm_lock_free() get a chance to be called. */
synchronize_rcu();
kmem_cache_destroy(ldlm_lock_slab);
kmem_cache_destroy(ldlm_interval_slab);
}
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