-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
- *
+/*
* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
* GPL HEADER END
*/
/*
- * Copyright 2008 Sun Microsystems, Inc. All rights reserved
+ * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
+ *
+ * Copyright (c) 2011, 2012, Whamcloud, Inc.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*/
+/** Implementation of client-side PortalRPC interfaces */
+
#define DEBUG_SUBSYSTEM S_RPC
#ifndef __KERNEL__
#include <errno.h>
#include "ptlrpc_internal.h"
+static int ptlrpc_send_new_req(struct ptlrpc_request *req);
+
+/**
+ * Initialize passed in client structure \a cl.
+ */
void ptlrpc_init_client(int req_portal, int rep_portal, char *name,
struct ptlrpc_client *cl)
{
cl->cli_reply_portal = rep_portal;
cl->cli_name = name;
}
+EXPORT_SYMBOL(ptlrpc_init_client);
+/**
+ * Return PortalRPC connection for remore uud \a uuid
+ */
struct ptlrpc_connection *ptlrpc_uuid_to_connection(struct obd_uuid *uuid)
{
struct ptlrpc_connection *c;
err = ptlrpc_uuid_to_peer(uuid, &peer, &self);
if (err != 0) {
- CERROR("cannot find peer %s!\n", uuid->uuid);
+ CNETERR("cannot find peer %s!\n", uuid->uuid);
return NULL;
}
return c;
}
+EXPORT_SYMBOL(ptlrpc_uuid_to_connection);
-static inline struct ptlrpc_bulk_desc *new_bulk(int npages, int type, int portal)
+/**
+ * Allocate and initialize new bulk descriptor
+ * Returns pointer to the descriptor or NULL on error.
+ */
+struct ptlrpc_bulk_desc *new_bulk(int npages, int type, int portal)
{
struct ptlrpc_bulk_desc *desc;
if (!desc)
return NULL;
- spin_lock_init(&desc->bd_lock);
+ cfs_spin_lock_init(&desc->bd_lock);
cfs_waitq_init(&desc->bd_waitq);
desc->bd_max_iov = npages;
desc->bd_iov_count = 0;
- desc->bd_md_h = LNET_INVALID_HANDLE;
+ LNetInvalidateHandle(&desc->bd_md_h);
desc->bd_portal = portal;
desc->bd_type = type;
return desc;
}
-struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_imp (struct ptlrpc_request *req,
- int npages, int type, int portal)
+/**
+ * Prepare bulk descriptor for specified outgoing request \a req that
+ * can fit \a npages * pages. \a type is bulk type. \a portal is where
+ * the bulk to be sent. Used on client-side.
+ * Returns pointer to newly allocatrd initialized bulk descriptor or NULL on
+ * error.
+ */
+struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_imp(struct ptlrpc_request *req,
+ int npages, int type, int portal)
{
struct obd_import *imp = req->rq_import;
struct ptlrpc_bulk_desc *desc;
return desc;
}
+EXPORT_SYMBOL(ptlrpc_prep_bulk_imp);
-struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_exp(struct ptlrpc_request *req,
- int npages, int type, int portal)
-{
- struct obd_export *exp = req->rq_export;
- struct ptlrpc_bulk_desc *desc;
-
- ENTRY;
- LASSERT(type == BULK_PUT_SOURCE || type == BULK_GET_SINK);
-
- desc = new_bulk(npages, type, portal);
- if (desc == NULL)
- RETURN(NULL);
-
- desc->bd_export = class_export_get(exp);
- desc->bd_req = req;
-
- desc->bd_cbid.cbid_fn = server_bulk_callback;
- desc->bd_cbid.cbid_arg = desc;
-
- /* NB we don't assign rq_bulk here; server-side requests are
- * re-used, and the handler frees the bulk desc explicitly. */
-
- return desc;
-}
-
+/**
+ * Add a page \a page to the bulk descriptor \a desc.
+ * Data to transfer in the page starts at offset \a pageoffset and
+ * amount of data to transfer from the page is \a len
+ */
void ptlrpc_prep_bulk_page(struct ptlrpc_bulk_desc *desc,
cfs_page_t *page, int pageoffset, int len)
{
desc->bd_nob += len;
+ cfs_page_pin(page);
ptlrpc_add_bulk_page(desc, page, pageoffset, len);
}
+EXPORT_SYMBOL(ptlrpc_prep_bulk_page);
+/**
+ * Uninitialize and free bulk descriptor \a desc.
+ * Works on bulk descriptors both from server and client side.
+ */
void ptlrpc_free_bulk(struct ptlrpc_bulk_desc *desc)
{
+ int i;
ENTRY;
LASSERT(desc != NULL);
else
class_import_put(desc->bd_import);
+ for (i = 0; i < desc->bd_iov_count ; i++)
+ cfs_page_unpin(desc->bd_iov[i].kiov_page);
+
OBD_FREE(desc, offsetof(struct ptlrpc_bulk_desc,
bd_iov[desc->bd_max_iov]));
EXIT;
}
+EXPORT_SYMBOL(ptlrpc_free_bulk);
-/* Set server timelimit for this req */
+/**
+ * Set server timelimit for this req, i.e. how long are we willing to wait
+ * for reply before timing out this request.
+ */
void ptlrpc_at_set_req_timeout(struct ptlrpc_request *req)
{
__u32 serv_est;
if (AT_OFF) {
/* non-AT settings */
+ /**
+ * \a imp_server_timeout means this is reverse import and
+ * we send (currently only) ASTs to the client and cannot afford
+ * to wait too long for the reply, otherwise the other client
+ * (because of which we are sending this request) would
+ * timeout waiting for us
+ */
req->rq_timeout = req->rq_import->imp_server_timeout ?
- obd_timeout / 2 : obd_timeout;
- lustre_msg_set_timeout(req->rq_reqmsg, req->rq_timeout);
- return;
+ obd_timeout / 2 : obd_timeout;
+ } else {
+ at = &req->rq_import->imp_at;
+ idx = import_at_get_index(req->rq_import,
+ req->rq_request_portal);
+ serv_est = at_get(&at->iat_service_estimate[idx]);
+ req->rq_timeout = at_est2timeout(serv_est);
}
-
- at = &req->rq_import->imp_at;
- idx = import_at_get_index(req->rq_import,
- req->rq_request_portal);
- serv_est = at_get(&at->iat_service_estimate[idx]);
- /* add an arbitrary minimum: 125% +5 sec */
- req->rq_timeout = serv_est + (serv_est >> 2) + 5;
/* We could get even fancier here, using history to predict increased
loading... */
reqmsg*/
lustre_msg_set_timeout(req->rq_reqmsg, req->rq_timeout);
}
+EXPORT_SYMBOL(ptlrpc_at_set_req_timeout);
/* Adjust max service estimate based on server value */
static void ptlrpc_at_adj_service(struct ptlrpc_request *req,
idx = import_at_get_index(req->rq_import, req->rq_request_portal);
/* max service estimates are tracked on the server side,
so just keep minimal history here */
- oldse = at_add(&at->iat_service_estimate[idx], serv_est);
+ oldse = at_measured(&at->iat_service_estimate[idx], serv_est);
if (oldse != 0)
CDEBUG(D_ADAPTTO, "The RPC service estimate for %s ptl %d "
"has changed from %d to %d\n",
CFS_DURATION_T"\n", service_time,
cfs_time_sub(now, req->rq_sent));
- oldnl = at_add(&at->iat_net_latency, nl);
+ oldnl = at_measured(&at->iat_net_latency, nl);
if (oldnl != 0)
CDEBUG(D_ADAPTTO, "The network latency for %s (nid %s) "
"has changed from %d to %d\n",
{
int rc;
- /* Clear reply swab mask; we may have already swabbed an early reply */
- req->rq_rep_swab_mask = 0;
-
- rc = lustre_unpack_msg(req->rq_repmsg, req->rq_replen);
- if (rc) {
- DEBUG_REQ(D_ERROR, req, "unpack_rep failed: %d", rc);
- return(-EPROTO);
+ if (SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) != SPTLRPC_POLICY_NULL) {
+ rc = ptlrpc_unpack_rep_msg(req, req->rq_replen);
+ if (rc) {
+ DEBUG_REQ(D_ERROR, req, "unpack_rep failed: %d", rc);
+ return(-EPROTO);
+ }
}
rc = lustre_unpack_rep_ptlrpc_body(req, MSG_PTLRPC_BODY_OFF);
return 0;
}
-/*
+/**
* Handle an early reply message, called with the rq_lock held.
* If anything goes wrong just ignore it - same as if it never happened
*/
ENTRY;
req->rq_early = 0;
- spin_unlock(&req->rq_lock);
+ cfs_spin_unlock(&req->rq_lock);
rc = sptlrpc_cli_unwrap_early_reply(req, &early_req);
if (rc) {
- spin_lock(&req->rq_lock);
+ cfs_spin_lock(&req->rq_lock);
RETURN(rc);
}
sptlrpc_cli_finish_early_reply(early_req);
- spin_lock(&req->rq_lock);
+ cfs_spin_lock(&req->rq_lock);
if (rc == 0) {
/* Adjust the local timeout for this req */
RETURN(rc);
}
+/**
+ * Wind down request pool \a pool.
+ * Frees all requests from the pool too
+ */
void ptlrpc_free_rq_pool(struct ptlrpc_request_pool *pool)
{
- struct list_head *l, *tmp;
+ cfs_list_t *l, *tmp;
struct ptlrpc_request *req;
- if (!pool)
- return;
+ LASSERT(pool != NULL);
- list_for_each_safe(l, tmp, &pool->prp_req_list) {
- req = list_entry(l, struct ptlrpc_request, rq_list);
- list_del(&req->rq_list);
+ cfs_spin_lock(&pool->prp_lock);
+ cfs_list_for_each_safe(l, tmp, &pool->prp_req_list) {
+ req = cfs_list_entry(l, struct ptlrpc_request, rq_list);
+ cfs_list_del(&req->rq_list);
LASSERT(req->rq_reqbuf);
LASSERT(req->rq_reqbuf_len == pool->prp_rq_size);
- OBD_FREE(req->rq_reqbuf, pool->prp_rq_size);
+ OBD_FREE_LARGE(req->rq_reqbuf, pool->prp_rq_size);
OBD_FREE(req, sizeof(*req));
}
+ cfs_spin_unlock(&pool->prp_lock);
OBD_FREE(pool, sizeof(*pool));
}
+EXPORT_SYMBOL(ptlrpc_free_rq_pool);
+/**
+ * Allocates, initializes and adds \a num_rq requests to the pool \a pool
+ */
void ptlrpc_add_rqs_to_pool(struct ptlrpc_request_pool *pool, int num_rq)
{
int i;
int size = 1;
- while (size < pool->prp_rq_size + SPTLRPC_MAX_PAYLOAD)
+ while (size < pool->prp_rq_size)
size <<= 1;
- LASSERTF(list_empty(&pool->prp_req_list) || size == pool->prp_rq_size,
+ LASSERTF(cfs_list_empty(&pool->prp_req_list) ||
+ size == pool->prp_rq_size,
"Trying to change pool size with nonempty pool "
"from %d to %d bytes\n", pool->prp_rq_size, size);
- spin_lock(&pool->prp_lock);
+ cfs_spin_lock(&pool->prp_lock);
pool->prp_rq_size = size;
for (i = 0; i < num_rq; i++) {
struct ptlrpc_request *req;
struct lustre_msg *msg;
- spin_unlock(&pool->prp_lock);
+ cfs_spin_unlock(&pool->prp_lock);
OBD_ALLOC(req, sizeof(struct ptlrpc_request));
if (!req)
return;
- OBD_ALLOC_GFP(msg, size, CFS_ALLOC_STD);
+ OBD_ALLOC_LARGE(msg, size);
if (!msg) {
OBD_FREE(req, sizeof(struct ptlrpc_request));
return;
req->rq_reqbuf = msg;
req->rq_reqbuf_len = size;
req->rq_pool = pool;
- spin_lock(&pool->prp_lock);
- list_add_tail(&req->rq_list, &pool->prp_req_list);
+ cfs_spin_lock(&pool->prp_lock);
+ cfs_list_add_tail(&req->rq_list, &pool->prp_req_list);
}
- spin_unlock(&pool->prp_lock);
+ cfs_spin_unlock(&pool->prp_lock);
return;
}
+EXPORT_SYMBOL(ptlrpc_add_rqs_to_pool);
-struct ptlrpc_request_pool *ptlrpc_init_rq_pool(int num_rq, int msgsize,
- void (*populate_pool)(struct ptlrpc_request_pool *, int))
+/**
+ * Create and initialize new request pool with given attributes:
+ * \a num_rq - initial number of requests to create for the pool
+ * \a msgsize - maximum message size possible for requests in thid pool
+ * \a populate_pool - function to be called when more requests need to be added
+ * to the pool
+ * Returns pointer to newly created pool or NULL on error.
+ */
+struct ptlrpc_request_pool *
+ptlrpc_init_rq_pool(int num_rq, int msgsize,
+ void (*populate_pool)(struct ptlrpc_request_pool *, int))
{
struct ptlrpc_request_pool *pool;
/* Request next power of two for the allocation, because internally
kernel would do exactly this */
- spin_lock_init(&pool->prp_lock);
+ cfs_spin_lock_init(&pool->prp_lock);
CFS_INIT_LIST_HEAD(&pool->prp_req_list);
- pool->prp_rq_size = msgsize;
+ pool->prp_rq_size = msgsize + SPTLRPC_MAX_PAYLOAD;
pool->prp_populate = populate_pool;
populate_pool(pool, num_rq);
- if (list_empty(&pool->prp_req_list)) {
+ if (cfs_list_empty(&pool->prp_req_list)) {
/* have not allocated a single request for the pool */
OBD_FREE(pool, sizeof (struct ptlrpc_request_pool));
pool = NULL;
}
return pool;
}
+EXPORT_SYMBOL(ptlrpc_init_rq_pool);
-static struct ptlrpc_request *ptlrpc_prep_req_from_pool(struct ptlrpc_request_pool *pool)
+/**
+ * Fetches one request from pool \a pool
+ */
+static struct ptlrpc_request *
+ptlrpc_prep_req_from_pool(struct ptlrpc_request_pool *pool)
{
struct ptlrpc_request *request;
struct lustre_msg *reqbuf;
if (!pool)
return NULL;
- spin_lock(&pool->prp_lock);
+ cfs_spin_lock(&pool->prp_lock);
/* See if we have anything in a pool, and bail out if nothing,
* in writeout path, where this matters, this is safe to do, because
* nothing is lost in this case, and when some in-flight requests
* complete, this code will be called again. */
- if (unlikely(list_empty(&pool->prp_req_list))) {
- spin_unlock(&pool->prp_lock);
+ if (unlikely(cfs_list_empty(&pool->prp_req_list))) {
+ cfs_spin_unlock(&pool->prp_lock);
return NULL;
}
- request = list_entry(pool->prp_req_list.next, struct ptlrpc_request,
- rq_list);
- list_del(&request->rq_list);
- spin_unlock(&pool->prp_lock);
+ request = cfs_list_entry(pool->prp_req_list.next, struct ptlrpc_request,
+ rq_list);
+ cfs_list_del_init(&request->rq_list);
+ cfs_spin_unlock(&pool->prp_lock);
LASSERT(request->rq_reqbuf);
LASSERT(request->rq_pool);
return request;
}
+/**
+ * Returns freed \a request to pool.
+ */
static void __ptlrpc_free_req_to_pool(struct ptlrpc_request *request)
{
struct ptlrpc_request_pool *pool = request->rq_pool;
- spin_lock(&pool->prp_lock);
- LASSERT(list_empty(&request->rq_list));
- list_add_tail(&request->rq_list, &pool->prp_req_list);
- spin_unlock(&pool->prp_lock);
+ cfs_spin_lock(&pool->prp_lock);
+ LASSERT(cfs_list_empty(&request->rq_list));
+ LASSERT(!request->rq_receiving_reply);
+ cfs_list_add_tail(&request->rq_list, &pool->prp_req_list);
+ cfs_spin_unlock(&pool->prp_lock);
}
static int __ptlrpc_request_bufs_pack(struct ptlrpc_request *request,
request->rq_reply_cbid.cbid_fn = reply_in_callback;
request->rq_reply_cbid.cbid_arg = request;
+ request->rq_reply_deadline = 0;
request->rq_phase = RQ_PHASE_NEW;
+ request->rq_next_phase = RQ_PHASE_UNDEFINED;
request->rq_request_portal = imp->imp_client->cli_request_portal;
request->rq_reply_portal = imp->imp_client->cli_reply_portal;
ptlrpc_at_set_req_timeout(request);
- spin_lock_init(&request->rq_lock);
+ cfs_spin_lock_init(&request->rq_lock);
CFS_INIT_LIST_HEAD(&request->rq_list);
CFS_INIT_LIST_HEAD(&request->rq_timed_list);
CFS_INIT_LIST_HEAD(&request->rq_replay_list);
- CFS_INIT_LIST_HEAD(&request->rq_mod_list);
CFS_INIT_LIST_HEAD(&request->rq_ctx_chain);
CFS_INIT_LIST_HEAD(&request->rq_set_chain);
CFS_INIT_LIST_HEAD(&request->rq_history_list);
+ CFS_INIT_LIST_HEAD(&request->rq_exp_list);
cfs_waitq_init(&request->rq_reply_waitq);
+ cfs_waitq_init(&request->rq_set_waitq);
request->rq_xid = ptlrpc_next_xid();
- atomic_set(&request->rq_refcount, 1);
+ cfs_atomic_set(&request->rq_refcount, 1);
lustre_msg_set_opc(request->rq_reqmsg, opcode);
}
EXPORT_SYMBOL(ptlrpc_request_bufs_pack);
+/**
+ * Pack request buffers for network transfer, performing necessary encryption
+ * steps if necessary.
+ */
int ptlrpc_request_pack(struct ptlrpc_request *request,
__u32 version, int opcode)
{
- return ptlrpc_request_bufs_pack(request, version, opcode, NULL, NULL);
-}
+ int rc;
+ rc = ptlrpc_request_bufs_pack(request, version, opcode, NULL, NULL);
+ if (rc)
+ return rc;
+
+ /* For some old 1.8 clients (< 1.8.7), they will LASSERT the size of
+ * ptlrpc_body sent from server equal to local ptlrpc_body size, so we
+ * have to send old ptlrpc_body to keep interoprability with these
+ * clients.
+ *
+ * Only three kinds of server->client RPCs so far:
+ * - LDLM_BL_CALLBACK
+ * - LDLM_CP_CALLBACK
+ * - LDLM_GL_CALLBACK
+ *
+ * XXX This should be removed whenever we drop the interoprability with
+ * the these old clients.
+ */
+ if (opcode == LDLM_BL_CALLBACK || opcode == LDLM_CP_CALLBACK ||
+ opcode == LDLM_GL_CALLBACK)
+ req_capsule_shrink(&request->rq_pill, &RMF_PTLRPC_BODY,
+ sizeof(struct ptlrpc_body_v2), RCL_CLIENT);
+
+ return rc;
+}
+EXPORT_SYMBOL(ptlrpc_request_pack);
+/**
+ * Helper function to allocate new request on import \a imp
+ * and possibly using existing request from pool \a pool if provided.
+ * Returns allocated request structure with import field filled or
+ * NULL on error.
+ */
static inline
struct ptlrpc_request *__ptlrpc_request_alloc(struct obd_import *imp,
struct ptlrpc_request_pool *pool)
return request;
}
+/**
+ * Helper function for creating a request.
+ * Calls __ptlrpc_request_alloc to allocate new request sturcture and inits
+ * buffer structures according to capsule template \a format.
+ * Returns allocated request structure pointer or NULL on error.
+ */
static struct ptlrpc_request *
ptlrpc_request_alloc_internal(struct obd_import *imp,
struct ptlrpc_request_pool * pool,
return request;
}
+/**
+ * Allocate new request structure for import \a imp and initialize its
+ * buffer structure according to capsule template \a format.
+ */
struct ptlrpc_request *ptlrpc_request_alloc(struct obd_import *imp,
const struct req_format *format)
{
return ptlrpc_request_alloc_internal(imp, NULL, format);
}
+EXPORT_SYMBOL(ptlrpc_request_alloc);
+/**
+ * Allocate new request structure for import \a imp from pool \a pool and
+ * initialize its buffer structure according to capsule template \a format.
+ */
struct ptlrpc_request *ptlrpc_request_alloc_pool(struct obd_import *imp,
struct ptlrpc_request_pool * pool,
const struct req_format *format)
{
return ptlrpc_request_alloc_internal(imp, pool, format);
}
+EXPORT_SYMBOL(ptlrpc_request_alloc_pool);
+/**
+ * For requests not from pool, free memory of the request structure.
+ * For requests obtained from a pool earlier, return request back to pool.
+ */
void ptlrpc_request_free(struct ptlrpc_request *request)
{
if (request->rq_pool)
else
OBD_FREE_PTR(request);
}
+EXPORT_SYMBOL(ptlrpc_request_free);
+/**
+ * Allocate new request for operatione \a opcode and immediatelly pack it for
+ * network transfer.
+ * Only used for simple requests like OBD_PING where the only important
+ * part of the request is operation itself.
+ * Returns allocated request or NULL on error.
+ */
struct ptlrpc_request *ptlrpc_request_alloc_pack(struct obd_import *imp,
const struct req_format *format,
__u32 version, int opcode)
}
return req;
}
+EXPORT_SYMBOL(ptlrpc_request_alloc_pack);
+/**
+ * Prepare request (fetched from pool \a poolif not NULL) on import \a imp
+ * for operation \a opcode. Request would contain \a count buffers.
+ * Sizes of buffers are described in array \a lengths and buffers themselves
+ * are provided by a pointer \a bufs.
+ * Returns prepared request structure pointer or NULL on error.
+ */
struct ptlrpc_request *
ptlrpc_prep_req_pool(struct obd_import *imp,
__u32 version, int opcode,
}
return request;
}
+EXPORT_SYMBOL(ptlrpc_prep_req_pool);
+/**
+ * Same as ptlrpc_prep_req_pool, but without pool
+ */
struct ptlrpc_request *
ptlrpc_prep_req(struct obd_import *imp, __u32 version, int opcode, int count,
__u32 *lengths, char **bufs)
return ptlrpc_prep_req_pool(imp, version, opcode, count, lengths, bufs,
NULL);
}
+EXPORT_SYMBOL(ptlrpc_prep_req);
-struct ptlrpc_request_set *ptlrpc_prep_set(void)
+/**
+ * Allocate "fake" request that would not be sent anywhere in the end.
+ * Only used as a hack because we have no other way of performing
+ * async actions in lustre between layers.
+ * Used on MDS to request object preallocations from more than one OST at a
+ * time.
+ */
+struct ptlrpc_request *ptlrpc_prep_fakereq(struct obd_import *imp,
+ unsigned int timeout,
+ ptlrpc_interpterer_t interpreter)
{
- struct ptlrpc_request_set *set;
-
+ struct ptlrpc_request *request = NULL;
ENTRY;
- OBD_ALLOC(set, sizeof *set);
- if (!set)
+
+ OBD_ALLOC(request, sizeof(*request));
+ if (!request) {
+ CERROR("request allocation out of memory\n");
RETURN(NULL);
- CFS_INIT_LIST_HEAD(&set->set_requests);
- cfs_waitq_init(&set->set_waitq);
- set->set_remaining = 0;
- spin_lock_init(&set->set_new_req_lock);
- CFS_INIT_LIST_HEAD(&set->set_new_requests);
- CFS_INIT_LIST_HEAD(&set->set_cblist);
+ }
+
+ request->rq_send_state = LUSTRE_IMP_FULL;
+ request->rq_type = PTL_RPC_MSG_REQUEST;
+ request->rq_import = class_import_get(imp);
+ request->rq_export = NULL;
+ request->rq_import_generation = imp->imp_generation;
+
+ request->rq_timeout = timeout;
+ request->rq_sent = cfs_time_current_sec();
+ request->rq_deadline = request->rq_sent + timeout;
+ request->rq_reply_deadline = request->rq_deadline;
+ request->rq_interpret_reply = interpreter;
+ request->rq_phase = RQ_PHASE_RPC;
+ request->rq_next_phase = RQ_PHASE_INTERPRET;
+ /* don't want reply */
+ request->rq_receiving_reply = 0;
+ request->rq_must_unlink = 0;
+ request->rq_no_delay = request->rq_no_resend = 1;
+ request->rq_fake = 1;
+
+ cfs_spin_lock_init(&request->rq_lock);
+ CFS_INIT_LIST_HEAD(&request->rq_list);
+ CFS_INIT_LIST_HEAD(&request->rq_replay_list);
+ CFS_INIT_LIST_HEAD(&request->rq_set_chain);
+ CFS_INIT_LIST_HEAD(&request->rq_history_list);
+ CFS_INIT_LIST_HEAD(&request->rq_exp_list);
+ cfs_waitq_init(&request->rq_reply_waitq);
+ cfs_waitq_init(&request->rq_set_waitq);
- RETURN(set);
+ request->rq_xid = ptlrpc_next_xid();
+ cfs_atomic_set(&request->rq_refcount, 1);
+
+ RETURN(request);
}
+EXPORT_SYMBOL(ptlrpc_prep_fakereq);
+
+/**
+ * Indicate that processing of "fake" request is finished.
+ */
+void ptlrpc_fakereq_finished(struct ptlrpc_request *req)
+{
+ struct ptlrpc_request_set *set = req->rq_set;
+ int wakeup = 0;
+
+ /* hold ref on the request to prevent others (ptlrpcd) to free it */
+ ptlrpc_request_addref(req);
+ cfs_list_del_init(&req->rq_list);
+
+ /* if we kill request before timeout - need adjust counter */
+ if (req->rq_phase == RQ_PHASE_RPC && set != NULL &&
+ cfs_atomic_dec_and_test(&set->set_remaining))
+ wakeup = 1;
+
+ ptlrpc_rqphase_move(req, RQ_PHASE_COMPLETE);
+
+ /* Only need to call wakeup once when to be empty. */
+ if (wakeup)
+ cfs_waitq_signal(&set->set_waitq);
+ ptlrpc_req_finished(req);
+}
+EXPORT_SYMBOL(ptlrpc_fakereq_finished);
+
+/**
+ * Allocate and initialize new request set structure.
+ * Returns a pointer to the newly allocated set structure or NULL on error.
+ */
+struct ptlrpc_request_set *ptlrpc_prep_set(void)
+{
+ struct ptlrpc_request_set *set;
+
+ ENTRY;
+ OBD_ALLOC(set, sizeof *set);
+ if (!set)
+ RETURN(NULL);
+ cfs_atomic_set(&set->set_refcount, 1);
+ CFS_INIT_LIST_HEAD(&set->set_requests);
+ cfs_waitq_init(&set->set_waitq);
+ cfs_atomic_set(&set->set_new_count, 0);
+ cfs_atomic_set(&set->set_remaining, 0);
+ cfs_spin_lock_init(&set->set_new_req_lock);
+ CFS_INIT_LIST_HEAD(&set->set_new_requests);
+ CFS_INIT_LIST_HEAD(&set->set_cblist);
+ set->set_max_inflight = UINT_MAX;
+ set->set_producer = NULL;
+ set->set_producer_arg = NULL;
+ set->set_rc = 0;
+
+ RETURN(set);
+}
+EXPORT_SYMBOL(ptlrpc_prep_set);
+
+/**
+ * Allocate and initialize new request set structure with flow control
+ * extension. This extension allows to control the number of requests in-flight
+ * for the whole set. A callback function to generate requests must be provided
+ * and the request set will keep the number of requests sent over the wire to
+ * @max_inflight.
+ * Returns a pointer to the newly allocated set structure or NULL on error.
+ */
+struct ptlrpc_request_set *ptlrpc_prep_fcset(int max, set_producer_func func,
+ void *arg)
+
+{
+ struct ptlrpc_request_set *set;
+
+ set = ptlrpc_prep_set();
+ if (!set)
+ RETURN(NULL);
-/* Finish with this set; opposite of prep_set. */
+ set->set_max_inflight = max;
+ set->set_producer = func;
+ set->set_producer_arg = arg;
+
+ RETURN(set);
+}
+EXPORT_SYMBOL(ptlrpc_prep_fcset);
+
+/**
+ * Wind down and free request set structure previously allocated with
+ * ptlrpc_prep_set.
+ * Ensures that all requests on the set have completed and removes
+ * all requests from the request list in a set.
+ * If any unsent request happen to be on the list, pretends that they got
+ * an error in flight and calls their completion handler.
+ */
void ptlrpc_set_destroy(struct ptlrpc_request_set *set)
{
- struct list_head *tmp;
- struct list_head *next;
+ cfs_list_t *tmp;
+ cfs_list_t *next;
int expected_phase;
int n = 0;
ENTRY;
/* Requests on the set should either all be completed, or all be new */
- expected_phase = (set->set_remaining == 0) ?
+ expected_phase = (cfs_atomic_read(&set->set_remaining) == 0) ?
RQ_PHASE_COMPLETE : RQ_PHASE_NEW;
- list_for_each (tmp, &set->set_requests) {
+ cfs_list_for_each (tmp, &set->set_requests) {
struct ptlrpc_request *req =
- list_entry(tmp, struct ptlrpc_request, rq_set_chain);
+ cfs_list_entry(tmp, struct ptlrpc_request,
+ rq_set_chain);
LASSERT(req->rq_phase == expected_phase);
n++;
}
- LASSERT(set->set_remaining == 0 || set->set_remaining == n);
+ LASSERTF(cfs_atomic_read(&set->set_remaining) == 0 ||
+ cfs_atomic_read(&set->set_remaining) == n, "%d / %d\n",
+ cfs_atomic_read(&set->set_remaining), n);
- list_for_each_safe(tmp, next, &set->set_requests) {
+ cfs_list_for_each_safe(tmp, next, &set->set_requests) {
struct ptlrpc_request *req =
- list_entry(tmp, struct ptlrpc_request, rq_set_chain);
- list_del_init(&req->rq_set_chain);
+ cfs_list_entry(tmp, struct ptlrpc_request,
+ rq_set_chain);
+ cfs_list_del_init(&req->rq_set_chain);
LASSERT(req->rq_phase == expected_phase);
if (req->rq_phase == RQ_PHASE_NEW) {
-
- if (req->rq_interpret_reply != NULL) {
- int (*interpreter)(struct ptlrpc_request *,
- void *, int) =
- req->rq_interpret_reply;
-
- /* higher level (i.e. LOV) failed;
- * let the sub reqs clean up */
- req->rq_status = -EBADR;
- interpreter(req, &req->rq_async_args,
- req->rq_status);
- }
- set->set_remaining--;
+ ptlrpc_req_interpret(NULL, req, -EBADR);
+ cfs_atomic_dec(&set->set_remaining);
}
+ cfs_spin_lock(&req->rq_lock);
req->rq_set = NULL;
+ req->rq_invalid_rqset = 0;
+ cfs_spin_unlock(&req->rq_lock);
+
ptlrpc_req_finished (req);
}
- LASSERT(set->set_remaining == 0);
+ LASSERT(cfs_atomic_read(&set->set_remaining) == 0);
- OBD_FREE(set, sizeof(*set));
+ ptlrpc_reqset_put(set);
EXIT;
}
+EXPORT_SYMBOL(ptlrpc_set_destroy);
+/**
+ * Add a callback function \a fn to the set.
+ * This function would be called when all requests on this set are completed.
+ * The function will be passed \a data argument.
+ */
int ptlrpc_set_add_cb(struct ptlrpc_request_set *set,
set_interpreter_func fn, void *data)
{
cbdata->psc_interpret = fn;
cbdata->psc_data = data;
- list_add_tail(&cbdata->psc_item, &set->set_cblist);
+ cfs_list_add_tail(&cbdata->psc_item, &set->set_cblist);
RETURN(0);
}
+EXPORT_SYMBOL(ptlrpc_set_add_cb);
+/**
+ * Add a new request to the general purpose request set.
+ * Assumes request reference from the caller.
+ */
void ptlrpc_set_add_req(struct ptlrpc_request_set *set,
struct ptlrpc_request *req)
{
- /* The set takes over the caller's request reference */
- list_add_tail(&req->rq_set_chain, &set->set_requests);
- req->rq_set = set;
- set->set_remaining++;
+ LASSERT(cfs_list_empty(&req->rq_set_chain));
+
+ /* The set takes over the caller's request reference */
+ cfs_list_add_tail(&req->rq_set_chain, &set->set_requests);
+ req->rq_set = set;
+ cfs_atomic_inc(&set->set_remaining);
+ req->rq_queued_time = cfs_time_current();
+
+ if (req->rq_reqmsg != NULL)
+ lustre_msg_set_jobid(req->rq_reqmsg, NULL);
- atomic_inc(&req->rq_import->imp_inflight);
+ if (set->set_producer != NULL)
+ /* If the request set has a producer callback, the RPC must be
+ * sent straight away */
+ ptlrpc_send_new_req(req);
}
+EXPORT_SYMBOL(ptlrpc_set_add_req);
/**
- * Lock so many callers can add things, the context that owns the set
- * is supposed to notice these and move them into the set proper.
+ * Add a request to a request with dedicated server thread
+ * and wake the thread to make any necessary processing.
+ * Currently only used for ptlrpcd.
*/
-int ptlrpc_set_add_new_req(struct ptlrpcd_ctl *pc,
+void ptlrpc_set_add_new_req(struct ptlrpcd_ctl *pc,
struct ptlrpc_request *req)
{
struct ptlrpc_request_set *set = pc->pc_set;
+ int count, i;
- /*
- * Let caller know that we stopped and will not handle this request.
- * It needs to take care itself of request.
- */
- if (test_bit(LIOD_STOP, &pc->pc_flags))
- return -EALREADY;
+ LASSERT(req->rq_set == NULL);
+ LASSERT(cfs_test_bit(LIOD_STOP, &pc->pc_flags) == 0);
- spin_lock(&set->set_new_req_lock);
+ cfs_spin_lock(&set->set_new_req_lock);
/*
* The set takes over the caller's request reference.
*/
- list_add_tail(&req->rq_set_chain, &set->set_new_requests);
req->rq_set = set;
- spin_unlock(&set->set_new_req_lock);
+ req->rq_queued_time = cfs_time_current();
+ cfs_list_add_tail(&req->rq_set_chain, &set->set_new_requests);
+ count = cfs_atomic_inc_return(&set->set_new_count);
+ cfs_spin_unlock(&set->set_new_req_lock);
- /*
- * Let thead know that we added something and better it to wake up
- * and process.
- */
- cfs_waitq_signal(&set->set_waitq);
- return 0;
+ /* Only need to call wakeup once for the first entry. */
+ if (count == 1) {
+ cfs_waitq_signal(&set->set_waitq);
+
+ /* XXX: It maybe unnecessary to wakeup all the partners. But to
+ * guarantee the async RPC can be processed ASAP, we have
+ * no other better choice. It maybe fixed in future. */
+ for (i = 0; i < pc->pc_npartners; i++)
+ cfs_waitq_signal(&pc->pc_partners[i]->pc_set->set_waitq);
+ }
}
+EXPORT_SYMBOL(ptlrpc_set_add_new_req);
-/*
+/**
* Based on the current state of the import, determine if the request
* can be sent, is an error, or should be delayed.
*
} else if (imp->imp_state == LUSTRE_IMP_NEW) {
DEBUG_REQ(D_ERROR, req, "Uninitialized import.");
*status = -EIO;
- LBUG();
} else if (imp->imp_state == LUSTRE_IMP_CLOSED) {
DEBUG_REQ(D_ERROR, req, "IMP_CLOSED ");
*status = -EIO;
+ } else if (ptlrpc_send_limit_expired(req)) {
+ /* probably doesn't need to be a D_ERROR after initial testing */
+ DEBUG_REQ(D_ERROR, req, "send limit expired ");
+ *status = -EIO;
} else if (req->rq_send_state == LUSTRE_IMP_CONNECTING &&
imp->imp_state == LUSTRE_IMP_CONNECTING) {
/* allow CONNECT even if import is invalid */ ;
- if (atomic_read(&imp->imp_inval_count) != 0) {
+ if (cfs_atomic_read(&imp->imp_inval_count) != 0) {
DEBUG_REQ(D_ERROR, req, "invalidate in flight");
*status = -EIO;
}
- } else if ((imp->imp_invalid && (!imp->imp_recon_bk)) ||
- imp->imp_obd->obd_no_recov) {
- /* If the import has been invalidated (such as by an OST
- * failure), and if the import(MGC) tried all of its connection
- * list (Bug 13464), the request must fail with -ESHUTDOWN.
- * This indicates the requests should be discarded; an -EIO
- * may result in a resend of the request. */
+ } else if (imp->imp_invalid || imp->imp_obd->obd_no_recov) {
if (!imp->imp_deactive)
DEBUG_REQ(D_ERROR, req, "IMP_INVALID");
*status = -ESHUTDOWN; /* bz 12940 */
*status = -EIO;
} else if (req->rq_send_state != imp->imp_state) {
/* invalidate in progress - any requests should be drop */
- if (atomic_read(&imp->imp_inval_count) != 0) {
+ if (cfs_atomic_read(&imp->imp_inval_count) != 0) {
DEBUG_REQ(D_ERROR, req, "invalidate in flight");
*status = -EIO;
} else if (imp->imp_dlm_fake || req->rq_no_delay) {
RETURN(delay);
}
-static int ptlrpc_check_reply(struct ptlrpc_request *req)
+/**
+ * Decide if the eror message regarding provided request \a req
+ * should be printed to the console or not.
+ * Makes it's decision on request status and other properties.
+ * Returns 1 to print error on the system console or 0 if not.
+ */
+static int ptlrpc_console_allow(struct ptlrpc_request *req)
{
- int rc = 0;
- ENTRY;
-
- /* serialise with network callback */
- spin_lock(&req->rq_lock);
-
- if (req->rq_replied)
- GOTO(out, rc = 1);
+ __u32 opc;
+ int err;
- if (req->rq_net_err && !req->rq_timedout) {
- spin_unlock(&req->rq_lock);
- rc = ptlrpc_expire_one_request(req);
- spin_lock(&req->rq_lock);
- GOTO(out, rc);
- }
+ /* Fake requests include no rq_reqmsg */
+ if (req->rq_fake)
+ return 0;
- if (req->rq_err)
- GOTO(out, rc = 1);
+ LASSERT(req->rq_reqmsg != NULL);
+ opc = lustre_msg_get_opc(req->rq_reqmsg);
- if (req->rq_resend)
- GOTO(out, rc = 1);
+ /* Suppress particular reconnect errors which are to be expected. No
+ * errors are suppressed for the initial connection on an import */
+ if ((lustre_handle_is_used(&req->rq_import->imp_remote_handle)) &&
+ (opc == OST_CONNECT || opc == MDS_CONNECT || opc == MGS_CONNECT)) {
- if (req->rq_restart)
- GOTO(out, rc = 1);
+ /* Suppress timed out reconnect requests */
+ if (req->rq_timedout)
+ return 0;
- if (req->rq_early) {
- ptlrpc_at_recv_early_reply(req);
- GOTO(out, rc = 0); /* keep waiting */
+ /* Suppress unavailable/again reconnect requests */
+ err = lustre_msg_get_status(req->rq_repmsg);
+ if (err == -ENODEV || err == -EAGAIN)
+ return 0;
}
- EXIT;
- out:
- spin_unlock(&req->rq_lock);
- DEBUG_REQ(D_NET, req, "rc = %d for", rc);
- return rc;
+ return 1;
}
+/**
+ * Check request processing status.
+ * Returns the status.
+ */
static int ptlrpc_check_status(struct ptlrpc_request *req)
{
int err;
DEBUG_REQ(D_INFO, req, "status is %d", err);
}
+ if (lustre_msg_get_type(req->rq_repmsg) == PTL_RPC_MSG_ERR) {
+ struct obd_import *imp = req->rq_import;
+ __u32 opc = lustre_msg_get_opc(req->rq_reqmsg);
+
+ if (ptlrpc_console_allow(req))
+ LCONSOLE_ERROR_MSG(0x011,"an error occurred while "
+ "communicating with %s. The %s "
+ "operation failed with %d\n",
+ libcfs_nid2str(
+ imp->imp_connection->c_peer.nid),
+ ll_opcode2str(opc), err);
+
+ RETURN(err < 0 ? err : -EINVAL);
+ }
+
RETURN(err);
}
/**
+ * save pre-versions of objects into request for replay.
+ * Versions are obtained from server reply.
+ * used for VBR.
+ */
+static void ptlrpc_save_versions(struct ptlrpc_request *req)
+{
+ struct lustre_msg *repmsg = req->rq_repmsg;
+ struct lustre_msg *reqmsg = req->rq_reqmsg;
+ __u64 *versions = lustre_msg_get_versions(repmsg);
+ ENTRY;
+
+ if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)
+ return;
+
+ LASSERT(versions);
+ lustre_msg_set_versions(reqmsg, versions);
+ CDEBUG(D_INFO, "Client save versions ["LPX64"/"LPX64"]\n",
+ versions[0], versions[1]);
+
+ EXIT;
+}
+
+/**
* Callback function called when client receives RPC reply for \a req.
+ * Returns 0 on success or error code.
+ * The return alue would be assigned to req->rq_status by the caller
+ * as request processing status.
+ * This function also decides if the request needs to be saved for later replay.
*/
static int after_reply(struct ptlrpc_request *req)
{
long timediff;
ENTRY;
- LASSERT(!req->rq_receiving_reply);
- LASSERT(obd);
- LASSERT(req->rq_nob_received <= req->rq_repbuf_len);
+ LASSERT(obd != NULL);
+ /* repbuf must be unlinked */
+ LASSERT(!req->rq_receiving_reply && !req->rq_must_unlink);
+
+ if (req->rq_reply_truncate) {
+ if (ptlrpc_no_resend(req)) {
+ DEBUG_REQ(D_ERROR, req, "reply buffer overflow,"
+ " expected: %d, actual size: %d",
+ req->rq_nob_received, req->rq_repbuf_len);
+ RETURN(-EOVERFLOW);
+ }
+
+ sptlrpc_cli_free_repbuf(req);
+ /* Pass the required reply buffer size (include
+ * space for early reply).
+ * NB: no need to roundup because alloc_repbuf
+ * will roundup it */
+ req->rq_replen = req->rq_nob_received;
+ req->rq_nob_received = 0;
+ req->rq_resend = 1;
+ RETURN(0);
+ }
/*
* NB Until this point, the whole of the incoming message,
* including buflens, status etc is in the sender's byte order.
*/
-
rc = sptlrpc_cli_unwrap_reply(req);
if (rc) {
DEBUG_REQ(D_ERROR, req, "unwrap reply failed (%d):", rc);
RETURN(rc);
}
+ /* retry indefinitely on EINPROGRESS */
+ if (lustre_msg_get_status(req->rq_repmsg) == -EINPROGRESS &&
+ ptlrpc_no_resend(req) == 0 && !req->rq_no_retry_einprogress) {
+ time_t now = cfs_time_current_sec();
+
+ DEBUG_REQ(D_RPCTRACE, req, "Resending request on EINPROGRESS");
+ req->rq_resend = 1;
+ req->rq_nr_resend++;
+
+ /* Readjust the timeout for current conditions */
+ ptlrpc_at_set_req_timeout(req);
+ /* delay resend to give a chance to the server to get ready.
+ * The delay is increased by 1s on every resend and is capped to
+ * the current request timeout (i.e. obd_timeout if AT is off,
+ * or AT service time x 125% + 5s, see at_est2timeout) */
+ if (req->rq_nr_resend > req->rq_timeout)
+ req->rq_sent = now + req->rq_timeout;
+ else
+ req->rq_sent = now + req->rq_nr_resend;
+ }
+
/*
* Security layer unwrap might ask resend this request.
*/
if (rc)
RETURN(rc);
- do_gettimeofday(&work_start);
+ cfs_gettimeofday(&work_start);
timediff = cfs_timeval_sub(&work_start, &req->rq_arrival_time, NULL);
- if (obd->obd_svc_stats != NULL)
+ if (obd->obd_svc_stats != NULL) {
lprocfs_counter_add(obd->obd_svc_stats, PTLRPC_REQWAIT_CNTR,
timediff);
+ ptlrpc_lprocfs_rpc_sent(req, timediff);
+ }
if (lustre_msg_get_type(req->rq_repmsg) != PTL_RPC_MSG_REPLY &&
lustre_msg_get_type(req->rq_repmsg) != PTL_RPC_MSG_ERR) {
RETURN(-EPROTO);
}
- OBD_FAIL_TIMEOUT(OBD_FAIL_PTLRPC_PAUSE_REP, obd_fail_val);
+ if (lustre_msg_get_opc(req->rq_reqmsg) != OBD_PING)
+ CFS_FAIL_TIMEOUT(OBD_FAIL_PTLRPC_PAUSE_REP, cfs_fail_val);
ptlrpc_at_adj_service(req, lustre_msg_get_timeout(req->rq_repmsg));
ptlrpc_at_adj_net_latency(req,
lustre_msg_get_service_time(req->rq_repmsg));
/*
* Store transno in reqmsg for replay.
*/
- req->rq_transno = lustre_msg_get_transno(req->rq_repmsg);
- lustre_msg_set_transno(req->rq_reqmsg, req->rq_transno);
+ if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)) {
+ req->rq_transno = lustre_msg_get_transno(req->rq_repmsg);
+ lustre_msg_set_transno(req->rq_reqmsg, req->rq_transno);
+ }
- if (req->rq_import->imp_replayable) {
- spin_lock(&imp->imp_lock);
+ if (imp->imp_replayable) {
+ cfs_spin_lock(&imp->imp_lock);
/*
* No point in adding already-committed requests to the replay
* list, we will just remove them immediately. b=9829
if (req->rq_transno != 0 &&
(req->rq_transno >
lustre_msg_get_last_committed(req->rq_repmsg) ||
- req->rq_replay))
+ req->rq_replay)) {
+ /** version recovery */
+ ptlrpc_save_versions(req);
ptlrpc_retain_replayable_request(req, imp);
- else if (req->rq_commit_cb != NULL) {
- spin_unlock(&imp->imp_lock);
+ } else if (req->rq_commit_cb != NULL) {
+ cfs_spin_unlock(&imp->imp_lock);
req->rq_commit_cb(req);
- spin_lock(&imp->imp_lock);
+ cfs_spin_lock(&imp->imp_lock);
}
/*
lustre_msg_get_last_committed(req->rq_repmsg);
}
ptlrpc_free_committed(imp);
- spin_unlock(&imp->imp_lock);
+
+ if (req->rq_transno > imp->imp_peer_committed_transno)
+ ptlrpc_pinger_commit_expected(imp);
+
+ cfs_spin_unlock(&imp->imp_lock);
}
RETURN(rc);
}
+/**
+ * Helper function to send request \a req over the network for the first time
+ * Also adjusts request phase.
+ * Returns 0 on success or error code.
+ */
static int ptlrpc_send_new_req(struct ptlrpc_request *req)
{
- struct obd_import *imp;
+ struct obd_import *imp = req->rq_import;
int rc;
ENTRY;
LASSERT(req->rq_phase == RQ_PHASE_NEW);
- if (req->rq_sent && (req->rq_sent > cfs_time_current_sec()))
+ if (req->rq_sent && (req->rq_sent > cfs_time_current_sec()) &&
+ (!req->rq_generation_set ||
+ req->rq_import_generation == imp->imp_generation))
RETURN (0);
- req->rq_phase = RQ_PHASE_RPC;
+ ptlrpc_rqphase_move(req, RQ_PHASE_RPC);
- imp = req->rq_import;
- spin_lock(&imp->imp_lock);
+ cfs_spin_lock(&imp->imp_lock);
- req->rq_import_generation = imp->imp_generation;
+ if (!req->rq_generation_set)
+ req->rq_import_generation = imp->imp_generation;
if (ptlrpc_import_delay_req(imp, req, &rc)) {
- spin_lock (&req->rq_lock);
+ cfs_spin_lock(&req->rq_lock);
req->rq_waiting = 1;
- spin_unlock (&req->rq_lock);
+ cfs_spin_unlock(&req->rq_lock);
DEBUG_REQ(D_HA, req, "req from PID %d waiting for recovery: "
- "(%s != %s)",
- lustre_msg_get_status(req->rq_reqmsg) ,
+ "(%s != %s)", lustre_msg_get_status(req->rq_reqmsg),
ptlrpc_import_state_name(req->rq_send_state),
ptlrpc_import_state_name(imp->imp_state));
- LASSERT(list_empty (&req->rq_list));
-
- list_add_tail(&req->rq_list, &imp->imp_delayed_list);
- spin_unlock(&imp->imp_lock);
+ LASSERT(cfs_list_empty(&req->rq_list));
+ cfs_list_add_tail(&req->rq_list, &imp->imp_delayed_list);
+ cfs_atomic_inc(&req->rq_import->imp_inflight);
+ cfs_spin_unlock(&imp->imp_lock);
RETURN(0);
}
if (rc != 0) {
- spin_unlock(&imp->imp_lock);
+ cfs_spin_unlock(&imp->imp_lock);
req->rq_status = rc;
- req->rq_phase = RQ_PHASE_INTERPRET;
+ ptlrpc_rqphase_move(req, RQ_PHASE_INTERPRET);
RETURN(rc);
}
- /* XXX this is the same as ptlrpc_queue_wait */
- LASSERT(list_empty(&req->rq_list));
- list_add_tail(&req->rq_list, &imp->imp_sending_list);
- spin_unlock(&imp->imp_lock);
+ LASSERT(cfs_list_empty(&req->rq_list));
+ cfs_list_add_tail(&req->rq_list, &imp->imp_sending_list);
+ cfs_atomic_inc(&req->rq_import->imp_inflight);
+ cfs_spin_unlock(&imp->imp_lock);
lustre_msg_set_status(req->rq_reqmsg, cfs_curproc_pid());
RETURN(0);
}
-/* this sends any unsent RPCs in @set and returns TRUE if all are sent */
-int ptlrpc_check_set(struct ptlrpc_request_set *set)
+static inline int ptlrpc_set_producer(struct ptlrpc_request_set *set)
{
- struct list_head *tmp;
+ int remaining, rc;
+ ENTRY;
+
+ LASSERT(set->set_producer != NULL);
+
+ remaining = cfs_atomic_read(&set->set_remaining);
+
+ /* populate the ->set_requests list with requests until we
+ * reach the maximum number of RPCs in flight for this set */
+ while (cfs_atomic_read(&set->set_remaining) < set->set_max_inflight) {
+ rc = set->set_producer(set, set->set_producer_arg);
+ if (rc == -ENOENT) {
+ /* no more RPC to produce */
+ set->set_producer = NULL;
+ set->set_producer_arg = NULL;
+ RETURN(0);
+ }
+ }
+
+ RETURN((cfs_atomic_read(&set->set_remaining) - remaining));
+}
+
+/**
+ * this sends any unsent RPCs in \a set and returns 1 if all are sent
+ * and no more replies are expected.
+ * (it is possible to get less replies than requests sent e.g. due to timed out
+ * requests or requests that we had trouble to send out)
+ */
+int ptlrpc_check_set(const struct lu_env *env, struct ptlrpc_request_set *set)
+{
+ cfs_list_t *tmp, *next;
int force_timer_recalc = 0;
ENTRY;
- if (set->set_remaining == 0)
+ if (cfs_atomic_read(&set->set_remaining) == 0)
RETURN(1);
- list_for_each(tmp, &set->set_requests) {
+ cfs_list_for_each_safe(tmp, next, &set->set_requests) {
struct ptlrpc_request *req =
- list_entry(tmp, struct ptlrpc_request, rq_set_chain);
+ cfs_list_entry(tmp, struct ptlrpc_request,
+ rq_set_chain);
struct obd_import *imp = req->rq_import;
+ int unregistered = 0;
int rc = 0;
if (req->rq_phase == RQ_PHASE_NEW &&
ptlrpc_send_new_req(req)) {
force_timer_recalc = 1;
}
+
/* delayed send - skip */
if (req->rq_phase == RQ_PHASE_NEW && req->rq_sent)
- continue;
+ continue;
+
+ /* delayed resend - skip */
+ if (req->rq_phase == RQ_PHASE_RPC && req->rq_resend &&
+ req->rq_sent > cfs_time_current_sec())
+ continue;
if (!(req->rq_phase == RQ_PHASE_RPC ||
req->rq_phase == RQ_PHASE_BULK ||
req->rq_phase == RQ_PHASE_INTERPRET ||
+ req->rq_phase == RQ_PHASE_UNREGISTERING ||
req->rq_phase == RQ_PHASE_COMPLETE)) {
DEBUG_REQ(D_ERROR, req, "bad phase %x", req->rq_phase);
LBUG();
}
+ if (req->rq_phase == RQ_PHASE_UNREGISTERING) {
+ LASSERT(req->rq_next_phase != req->rq_phase);
+ LASSERT(req->rq_next_phase != RQ_PHASE_UNDEFINED);
+
+ /*
+ * Skip processing until reply is unlinked. We
+ * can't return to pool before that and we can't
+ * call interpret before that. We need to make
+ * sure that all rdma transfers finished and will
+ * not corrupt any data.
+ */
+ if (ptlrpc_client_recv_or_unlink(req) ||
+ ptlrpc_client_bulk_active(req))
+ continue;
+
+ /*
+ * Turn fail_loc off to prevent it from looping
+ * forever.
+ */
+ if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK)) {
+ OBD_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK,
+ OBD_FAIL_ONCE);
+ }
+ if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_BULK_UNLINK)) {
+ OBD_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_LONG_BULK_UNLINK,
+ OBD_FAIL_ONCE);
+ }
+
+ /*
+ * Move to next phase if reply was successfully
+ * unlinked.
+ */
+ ptlrpc_rqphase_move(req, req->rq_next_phase);
+ }
+
if (req->rq_phase == RQ_PHASE_COMPLETE)
continue;
if (req->rq_phase == RQ_PHASE_INTERPRET)
GOTO(interpret, req->rq_status);
- if (req->rq_net_err && !req->rq_timedout)
- ptlrpc_expire_one_request(req);
+ /*
+ * Note that this also will start async reply unlink.
+ */
+ if (req->rq_net_err && !req->rq_timedout) {
+ ptlrpc_expire_one_request(req, 1);
+
+ /*
+ * Check if we still need to wait for unlink.
+ */
+ if (ptlrpc_client_recv_or_unlink(req) ||
+ ptlrpc_client_bulk_active(req))
+ continue;
+ /* If there is no need to resend, fail it now. */
+ if (req->rq_no_resend) {
+ if (req->rq_status == 0)
+ req->rq_status = -EIO;
+ ptlrpc_rqphase_move(req, RQ_PHASE_INTERPRET);
+ GOTO(interpret, req->rq_status);
+ } else {
+ continue;
+ }
+ }
if (req->rq_err) {
- ptlrpc_unregister_reply(req);
+ cfs_spin_lock(&req->rq_lock);
req->rq_replied = 0;
+ cfs_spin_unlock(&req->rq_lock);
if (req->rq_status == 0)
req->rq_status = -EIO;
- req->rq_phase = RQ_PHASE_INTERPRET;
-
- spin_lock(&imp->imp_lock);
- list_del_init(&req->rq_list);
- spin_unlock(&imp->imp_lock);
-
+ ptlrpc_rqphase_move(req, RQ_PHASE_INTERPRET);
GOTO(interpret, req->rq_status);
}
- /* ptlrpc_queue_wait->l_wait_event guarantees that rq_intr
- * will only be set after rq_timedout, but the oig waiting
- * path sets rq_intr irrespective of whether ptlrpcd has
- * seen a timeout. our policy is to only interpret
- * interrupted rpcs after they have timed out */
+ /* ptlrpc_set_wait->l_wait_event sets lwi_allow_intr
+ * so it sets rq_intr regardless of individual rpc
+ * timeouts. The synchronous IO waiting path sets
+ * rq_intr irrespective of whether ptlrpcd
+ * has seen a timeout. Our policy is to only interpret
+ * interrupted rpcs after they have timed out, so we
+ * need to enforce that here.
+ */
+
if (req->rq_intr && (req->rq_timedout || req->rq_waiting ||
req->rq_wait_ctx)) {
- /* NB could be on delayed list */
- ptlrpc_unregister_reply(req);
req->rq_status = -EINTR;
- req->rq_phase = RQ_PHASE_INTERPRET;
-
- spin_lock(&imp->imp_lock);
- list_del_init(&req->rq_list);
- spin_unlock(&imp->imp_lock);
-
+ ptlrpc_rqphase_move(req, RQ_PHASE_INTERPRET);
GOTO(interpret, req->rq_status);
}
req->rq_waiting || req->rq_wait_ctx) {
int status;
- ptlrpc_unregister_reply(req);
-
- spin_lock(&imp->imp_lock);
+ if (!ptlrpc_unregister_reply(req, 1))
+ continue;
+ cfs_spin_lock(&imp->imp_lock);
if (ptlrpc_import_delay_req(imp, req, &status)){
- spin_unlock(&imp->imp_lock);
+ /* put on delay list - only if we wait
+ * recovery finished - before send */
+ cfs_list_del_init(&req->rq_list);
+ cfs_list_add_tail(&req->rq_list,
+ &imp-> \
+ imp_delayed_list);
+ cfs_spin_unlock(&imp->imp_lock);
continue;
}
- list_del_init(&req->rq_list);
if (status != 0) {
req->rq_status = status;
- req->rq_phase = RQ_PHASE_INTERPRET;
- spin_unlock(&imp->imp_lock);
+ ptlrpc_rqphase_move(req,
+ RQ_PHASE_INTERPRET);
+ cfs_spin_unlock(&imp->imp_lock);
GOTO(interpret, req->rq_status);
}
- if (req->rq_no_resend && !req->rq_wait_ctx) {
+ if (ptlrpc_no_resend(req) && !req->rq_wait_ctx) {
req->rq_status = -ENOTCONN;
- req->rq_phase = RQ_PHASE_INTERPRET;
- spin_unlock(&imp->imp_lock);
+ ptlrpc_rqphase_move(req,
+ RQ_PHASE_INTERPRET);
+ cfs_spin_unlock(&imp->imp_lock);
GOTO(interpret, req->rq_status);
}
- list_add_tail(&req->rq_list,
+
+ cfs_list_del_init(&req->rq_list);
+ cfs_list_add_tail(&req->rq_list,
&imp->imp_sending_list);
- spin_unlock(&imp->imp_lock);
+ cfs_spin_unlock(&imp->imp_lock);
+ cfs_spin_lock(&req->rq_lock);
req->rq_waiting = 0;
- if (req->rq_resend) {
- lustre_msg_add_flags(req->rq_reqmsg,
- MSG_RESENT);
+ cfs_spin_unlock(&req->rq_lock);
+
+ if (req->rq_timedout || req->rq_resend) {
+ /* This is re-sending anyways,
+ * let's mark req as resend. */
+ cfs_spin_lock(&req->rq_lock);
+ req->rq_resend = 1;
+ cfs_spin_unlock(&req->rq_lock);
if (req->rq_bulk) {
- __u64 old_xid = req->rq_xid;
+ __u64 old_xid;
- ptlrpc_unregister_bulk (req);
+ if (!ptlrpc_unregister_bulk(req, 1))
+ continue;
/* ensure previous bulk fails */
+ old_xid = req->rq_xid;
req->rq_xid = ptlrpc_next_xid();
CDEBUG(D_HA, "resend bulk "
"old x"LPU64
if (status) {
if (req->rq_err) {
req->rq_status = status;
+ cfs_spin_lock(&req->rq_lock);
+ req->rq_wait_ctx = 0;
+ cfs_spin_unlock(&req->rq_lock);
force_timer_recalc = 1;
} else {
+ cfs_spin_lock(&req->rq_lock);
req->rq_wait_ctx = 1;
+ cfs_spin_unlock(&req->rq_lock);
}
continue;
} else {
+ cfs_spin_lock(&req->rq_lock);
req->rq_wait_ctx = 0;
+ cfs_spin_unlock(&req->rq_lock);
}
rc = ptl_send_rpc(req, 0);
DEBUG_REQ(D_HA, req, "send failed (%d)",
rc);
force_timer_recalc = 1;
+ cfs_spin_lock(&req->rq_lock);
req->rq_net_err = 1;
+ cfs_spin_unlock(&req->rq_lock);
}
/* need to reset the timeout */
force_timer_recalc = 1;
}
- spin_lock(&req->rq_lock);
+ cfs_spin_lock(&req->rq_lock);
- if (req->rq_early) {
+ if (ptlrpc_client_early(req)) {
ptlrpc_at_recv_early_reply(req);
- spin_unlock(&req->rq_lock);
+ cfs_spin_unlock(&req->rq_lock);
continue;
}
/* Still waiting for a reply? */
- if (req->rq_receiving_reply) {
- spin_unlock(&req->rq_lock);
+ if (ptlrpc_client_recv(req)) {
+ cfs_spin_unlock(&req->rq_lock);
continue;
}
/* Did we actually receive a reply? */
- if (!req->rq_replied) {
- spin_unlock(&req->rq_lock);
+ if (!ptlrpc_client_replied(req)) {
+ cfs_spin_unlock(&req->rq_lock);
continue;
}
- spin_unlock(&req->rq_lock);
+ cfs_spin_unlock(&req->rq_lock);
- spin_lock(&imp->imp_lock);
- list_del_init(&req->rq_list);
- spin_unlock(&imp->imp_lock);
+ /* unlink from net because we are going to
+ * swab in-place of reply buffer */
+ unregistered = ptlrpc_unregister_reply(req, 1);
+ if (!unregistered)
+ continue;
req->rq_status = after_reply(req);
- if (req->rq_resend) {
- /* Add this req to the delayed list so
- it can be errored if the import is
- evicted after recovery. */
- spin_lock(&imp->imp_lock);
- list_add_tail(&req->rq_list,
- &imp->imp_delayed_list);
- spin_unlock(&imp->imp_lock);
+ if (req->rq_resend)
continue;
- }
/* If there is no bulk associated with this request,
* then we're done and should let the interpreter
- * process the reply. Similarly if the RPC returned
+ * process the reply. Similarly if the RPC returned
* an error, and therefore the bulk will never arrive.
*/
- if (req->rq_bulk == NULL || req->rq_status != 0) {
- req->rq_phase = RQ_PHASE_INTERPRET;
+ if (req->rq_bulk == NULL || req->rq_status < 0) {
+ ptlrpc_rqphase_move(req, RQ_PHASE_INTERPRET);
GOTO(interpret, req->rq_status);
}
- req->rq_phase = RQ_PHASE_BULK;
+ ptlrpc_rqphase_move(req, RQ_PHASE_BULK);
}
LASSERT(req->rq_phase == RQ_PHASE_BULK);
- if (ptlrpc_bulk_active(req->rq_bulk))
+ if (ptlrpc_client_bulk_active(req))
continue;
if (!req->rq_bulk->bd_success) {
/* The RPC reply arrived OK, but the bulk screwed
- * up! Dead wierd since the server told us the RPC
+ * up! Dead weird since the server told us the RPC
* was good after getting the REPLY for her GET or
* the ACK for her PUT. */
DEBUG_REQ(D_ERROR, req, "bulk transfer failed");
- LBUG();
+ req->rq_status = -EIO;
}
- req->rq_phase = RQ_PHASE_INTERPRET;
+ ptlrpc_rqphase_move(req, RQ_PHASE_INTERPRET);
interpret:
LASSERT(req->rq_phase == RQ_PHASE_INTERPRET);
- LASSERT(!req->rq_receiving_reply);
- ptlrpc_unregister_reply(req);
- if (req->rq_bulk != NULL)
- ptlrpc_unregister_bulk (req);
+ /* This moves to "unregistering" phase we need to wait for
+ * reply unlink. */
+ if (!unregistered && !ptlrpc_unregister_reply(req, 1)) {
+ /* start async bulk unlink too */
+ ptlrpc_unregister_bulk(req, 1);
+ continue;
+ }
+
+ if (!ptlrpc_unregister_bulk(req, 1))
+ continue;
+
+ /* When calling interpret receiving already should be
+ * finished. */
+ LASSERT(!req->rq_receiving_reply);
- if (req->rq_interpret_reply != NULL) {
- int (*interpreter)(struct ptlrpc_request *,void *,int) =
- req->rq_interpret_reply;
- req->rq_status = interpreter(req, &req->rq_async_args,
- req->rq_status);
+ ptlrpc_req_interpret(env, req, req->rq_status);
+
+ ptlrpc_rqphase_move(req, RQ_PHASE_COMPLETE);
+
+ CDEBUG(req->rq_reqmsg != NULL ? D_RPCTRACE : 0,
+ "Completed RPC pname:cluuid:pid:xid:nid:"
+ "opc %s:%s:%d:"LPU64":%s:%d\n",
+ cfs_curproc_comm(), imp->imp_obd->obd_uuid.uuid,
+ lustre_msg_get_status(req->rq_reqmsg), req->rq_xid,
+ libcfs_nid2str(imp->imp_connection->c_peer.nid),
+ lustre_msg_get_opc(req->rq_reqmsg));
+
+ cfs_spin_lock(&imp->imp_lock);
+ /* Request already may be not on sending or delaying list. This
+ * may happen in the case of marking it erroneous for the case
+ * ptlrpc_import_delay_req(req, status) find it impossible to
+ * allow sending this rpc and returns *status != 0. */
+ if (!cfs_list_empty(&req->rq_list)) {
+ cfs_list_del_init(&req->rq_list);
+ cfs_atomic_dec(&imp->imp_inflight);
}
- req->rq_phase = RQ_PHASE_COMPLETE;
+ cfs_spin_unlock(&imp->imp_lock);
+
+ cfs_atomic_dec(&set->set_remaining);
+ cfs_waitq_broadcast(&imp->imp_recovery_waitq);
- CDEBUG(D_RPCTRACE, "Completed RPC pname:cluuid:pid:xid:nid:"
- "opc %s:%s:%d:"LPU64":%s:%d\n", cfs_curproc_comm(),
- imp->imp_obd->obd_uuid.uuid,
- lustre_msg_get_status(req->rq_reqmsg), req->rq_xid,
- libcfs_nid2str(imp->imp_connection->c_peer.nid),
- lustre_msg_get_opc(req->rq_reqmsg));
+ if (set->set_producer) {
+ /* produce a new request if possible */
+ if (ptlrpc_set_producer(set) > 0)
+ force_timer_recalc = 1;
- atomic_dec(&imp->imp_inflight);
- set->set_remaining--;
- cfs_waitq_signal(&imp->imp_recovery_waitq);
+ /* free the request that has just been completed
+ * in order not to pollute set->set_requests */
+ cfs_list_del_init(&req->rq_set_chain);
+ cfs_spin_lock(&req->rq_lock);
+ req->rq_set = NULL;
+ req->rq_invalid_rqset = 0;
+ cfs_spin_unlock(&req->rq_lock);
+
+ /* record rq_status to compute the final status later */
+ if (req->rq_status != 0)
+ set->set_rc = req->rq_status;
+ ptlrpc_req_finished(req);
+ }
}
/* If we hit an error, we want to recover promptly. */
- RETURN(set->set_remaining == 0 || force_timer_recalc);
+ RETURN(cfs_atomic_read(&set->set_remaining) == 0 || force_timer_recalc);
}
+EXPORT_SYMBOL(ptlrpc_check_set);
-/* Return 1 if we should give up, else 0 */
-int ptlrpc_expire_one_request(struct ptlrpc_request *req)
+/**
+ * Time out request \a req. is \a async_unlink is set, that means do not wait
+ * until LNet actually confirms network buffer unlinking.
+ * Return 1 if we should give up further retrying attempts or 0 otherwise.
+ */
+int ptlrpc_expire_one_request(struct ptlrpc_request *req, int async_unlink)
{
struct obd_import *imp = req->rq_import;
int rc = 0;
ENTRY;
- DEBUG_REQ(D_ERROR|D_NETERROR, req,
- "%s (sent at "CFS_TIME_T", "CFS_DURATION_T"s ago)",
- req->rq_net_err ? "network error" : "timeout",
- req->rq_sent, cfs_time_sub(cfs_time_current_sec(),
- req->rq_sent));
-
- if (imp) {
- LCONSOLE_WARN("Request x"LPU64" sent from %s to NID %s "
- CFS_DURATION_T"s ago has timed out "
- "(limit "CFS_DURATION_T"s).\n", req->rq_xid,
- req->rq_import->imp_obd->obd_name,
- libcfs_nid2str(imp->imp_connection->c_peer.nid),
- cfs_time_sub(cfs_time_current_sec(), req->rq_sent),
- cfs_time_sub(req->rq_deadline, req->rq_sent));
- }
+ cfs_spin_lock(&req->rq_lock);
+ req->rq_timedout = 1;
+ cfs_spin_unlock(&req->rq_lock);
+
+ DEBUG_REQ(req->rq_fake ? D_INFO : D_WARNING, req, "Request "
+ " sent has %s: [sent "CFS_DURATION_T"/"
+ "real "CFS_DURATION_T"]",
+ req->rq_net_err ? "failed due to network error" :
+ ((req->rq_real_sent == 0 ||
+ cfs_time_before(req->rq_real_sent, req->rq_sent) ||
+ cfs_time_aftereq(req->rq_real_sent, req->rq_deadline)) ?
+ "timed out for sent delay" : "timed out for slow reply"),
+ req->rq_sent, req->rq_real_sent);
if (imp != NULL && obd_debug_peer_on_timeout)
LNetCtl(IOC_LIBCFS_DEBUG_PEER, &imp->imp_connection->c_peer);
- spin_lock(&req->rq_lock);
- req->rq_timedout = 1;
- spin_unlock(&req->rq_lock);
-
- ptlrpc_unregister_reply (req);
+ ptlrpc_unregister_reply(req, async_unlink);
+ ptlrpc_unregister_bulk(req, async_unlink);
if (obd_dump_on_timeout)
libcfs_debug_dumplog();
- if (req->rq_bulk != NULL)
- ptlrpc_unregister_bulk (req);
-
if (imp == NULL) {
DEBUG_REQ(D_HA, req, "NULL import: already cleaned up?");
RETURN(1);
}
+ if (req->rq_fake)
+ RETURN(1);
+
+ cfs_atomic_inc(&imp->imp_timeouts);
+
/* The DLM server doesn't want recovery run on its imports. */
if (imp->imp_dlm_fake)
RETURN(1);
DEBUG_REQ(D_RPCTRACE, req, "err -110, sent_state=%s (now=%s)",
ptlrpc_import_state_name(req->rq_send_state),
ptlrpc_import_state_name(imp->imp_state));
- spin_lock(&req->rq_lock);
+ cfs_spin_lock(&req->rq_lock);
req->rq_status = -ETIMEDOUT;
req->rq_err = 1;
- spin_unlock(&req->rq_lock);
+ cfs_spin_unlock(&req->rq_lock);
RETURN(1);
}
/* if a request can't be resent we can't wait for an answer after
the timeout */
- if (req->rq_no_resend) {
+ if (ptlrpc_no_resend(req)) {
DEBUG_REQ(D_RPCTRACE, req, "TIMEOUT-NORESEND:");
rc = 1;
}
RETURN(rc);
}
+/**
+ * Time out all uncompleted requests in request set pointed by \a data
+ * Callback used when waiting on sets with l_wait_event.
+ * Always returns 1.
+ */
int ptlrpc_expired_set(void *data)
{
struct ptlrpc_request_set *set = data;
- struct list_head *tmp;
+ cfs_list_t *tmp;
time_t now = cfs_time_current_sec();
ENTRY;
LASSERT(set != NULL);
- /* A timeout expired; see which reqs it applies to... */
- list_for_each (tmp, &set->set_requests) {
+ /*
+ * A timeout expired. See which reqs it applies to...
+ */
+ cfs_list_for_each (tmp, &set->set_requests) {
struct ptlrpc_request *req =
- list_entry(tmp, struct ptlrpc_request, rq_set_chain);
+ cfs_list_entry(tmp, struct ptlrpc_request,
+ rq_set_chain);
+
+ /* don't expire request waiting for context */
+ if (req->rq_wait_ctx)
+ continue;
- /* request in-flight? */
- if (!(((req->rq_phase == RQ_PHASE_RPC) && !req->rq_waiting &&
- !req->rq_resend) ||
+ /* Request in-flight? */
+ if (!((req->rq_phase == RQ_PHASE_RPC &&
+ !req->rq_waiting && !req->rq_resend) ||
(req->rq_phase == RQ_PHASE_BULK)))
continue;
- if (req->rq_timedout || /* already dealt with */
- req->rq_deadline > now) /* not expired */
+ if (req->rq_timedout || /* already dealt with */
+ req->rq_deadline > now) /* not expired */
continue;
- /* deal with this guy */
- ptlrpc_expire_one_request (req);
+ /* Deal with this guy. Do it asynchronously to not block
+ * ptlrpcd thread. */
+ ptlrpc_expire_one_request(req, 1);
}
- /* When waiting for a whole set, we always to break out of the
+ /*
+ * When waiting for a whole set, we always break out of the
* sleep so we can recalculate the timeout, or enable interrupts
- * iff everyone's timed out.
+ * if everyone's timed out.
*/
RETURN(1);
}
+EXPORT_SYMBOL(ptlrpc_expired_set);
+/**
+ * Sets rq_intr flag in \a req under spinlock.
+ */
void ptlrpc_mark_interrupted(struct ptlrpc_request *req)
{
- spin_lock(&req->rq_lock);
+ cfs_spin_lock(&req->rq_lock);
req->rq_intr = 1;
- spin_unlock(&req->rq_lock);
+ cfs_spin_unlock(&req->rq_lock);
}
+EXPORT_SYMBOL(ptlrpc_mark_interrupted);
+/**
+ * Interrupts (sets interrupted flag) all uncompleted requests in
+ * a set \a data. Callback for l_wait_event for interruptible waits.
+ */
void ptlrpc_interrupted_set(void *data)
{
struct ptlrpc_request_set *set = data;
- struct list_head *tmp;
+ cfs_list_t *tmp;
LASSERT(set != NULL);
- CERROR("INTERRUPTED SET %p\n", set);
+ CDEBUG(D_RPCTRACE, "INTERRUPTED SET %p\n", set);
- list_for_each(tmp, &set->set_requests) {
+ cfs_list_for_each(tmp, &set->set_requests) {
struct ptlrpc_request *req =
- list_entry(tmp, struct ptlrpc_request, rq_set_chain);
+ cfs_list_entry(tmp, struct ptlrpc_request,
+ rq_set_chain);
- if (req->rq_phase != RQ_PHASE_RPC)
+ if (req->rq_phase != RQ_PHASE_RPC &&
+ req->rq_phase != RQ_PHASE_UNREGISTERING)
continue;
ptlrpc_mark_interrupted(req);
}
}
+EXPORT_SYMBOL(ptlrpc_interrupted_set);
-/* get the smallest timeout in the set; this does NOT set a timeout. */
+/**
+ * Get the smallest timeout in the set; this does NOT set a timeout.
+ */
int ptlrpc_set_next_timeout(struct ptlrpc_request_set *set)
{
- struct list_head *tmp;
+ cfs_list_t *tmp;
time_t now = cfs_time_current_sec();
int timeout = 0;
struct ptlrpc_request *req;
SIGNAL_MASK_ASSERT(); /* XXX BUG 1511 */
- list_for_each(tmp, &set->set_requests) {
- req = list_entry(tmp, struct ptlrpc_request, rq_set_chain);
+ cfs_list_for_each(tmp, &set->set_requests) {
+ req = cfs_list_entry(tmp, struct ptlrpc_request, rq_set_chain);
- /* request in-flight? */
- if (!((req->rq_phase == RQ_PHASE_RPC && !req->rq_waiting) ||
+ /*
+ * Request in-flight?
+ */
+ if (!(((req->rq_phase == RQ_PHASE_RPC) && !req->rq_waiting) ||
(req->rq_phase == RQ_PHASE_BULK) ||
(req->rq_phase == RQ_PHASE_NEW)))
continue;
- if (req->rq_timedout) /* already timed out */
+ /*
+ * Already timed out.
+ */
+ if (req->rq_timedout)
continue;
- if (req->rq_wait_ctx) /* waiting for ctx */
+ /*
+ * Waiting for ctx.
+ */
+ if (req->rq_wait_ctx)
continue;
if (req->rq_phase == RQ_PHASE_NEW)
deadline = req->rq_sent;
+ else if (req->rq_phase == RQ_PHASE_RPC && req->rq_resend)
+ deadline = req->rq_sent;
else
deadline = req->rq_sent + req->rq_timeout;
}
RETURN(timeout);
}
+EXPORT_SYMBOL(ptlrpc_set_next_timeout);
+/**
+ * Send all unset request from the set and then wait untill all
+ * requests in the set complete (either get a reply, timeout, get an
+ * error or otherwise be interrupted).
+ * Returns 0 on success or error code otherwise.
+ */
int ptlrpc_set_wait(struct ptlrpc_request_set *set)
{
- struct list_head *tmp;
+ cfs_list_t *tmp;
struct ptlrpc_request *req;
struct l_wait_info lwi;
int rc, timeout;
ENTRY;
- if (list_empty(&set->set_requests))
+ if (set->set_producer)
+ (void)ptlrpc_set_producer(set);
+ else
+ cfs_list_for_each(tmp, &set->set_requests) {
+ req = cfs_list_entry(tmp, struct ptlrpc_request,
+ rq_set_chain);
+ if (req->rq_phase == RQ_PHASE_NEW)
+ (void)ptlrpc_send_new_req(req);
+ }
+
+ if (cfs_list_empty(&set->set_requests))
RETURN(0);
- list_for_each(tmp, &set->set_requests) {
- req = list_entry(tmp, struct ptlrpc_request, rq_set_chain);
- if (req->rq_phase == RQ_PHASE_NEW)
- (void)ptlrpc_send_new_req(req);
- }
-
do {
timeout = ptlrpc_set_next_timeout(set);
* req times out */
CDEBUG(D_RPCTRACE, "set %p going to sleep for %d seconds\n",
set, timeout);
- lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(timeout ? timeout : 1),
- ptlrpc_expired_set,
- ptlrpc_interrupted_set, set);
- rc = l_wait_event(set->set_waitq, ptlrpc_check_set(set), &lwi);
+
+ if (timeout == 0 && !cfs_signal_pending())
+ /*
+ * No requests are in-flight (ether timed out
+ * or delayed), so we can allow interrupts.
+ * We still want to block for a limited time,
+ * so we allow interrupts during the timeout.
+ */
+ lwi = LWI_TIMEOUT_INTR_ALL(cfs_time_seconds(1),
+ ptlrpc_expired_set,
+ ptlrpc_interrupted_set, set);
+ else
+ /*
+ * At least one request is in flight, so no
+ * interrupts are allowed. Wait until all
+ * complete, or an in-flight req times out.
+ */
+ lwi = LWI_TIMEOUT(cfs_time_seconds(timeout? timeout : 1),
+ ptlrpc_expired_set, set);
+
+ rc = l_wait_event(set->set_waitq, ptlrpc_check_set(NULL, set), &lwi);
+
+ /* LU-769 - if we ignored the signal because it was already
+ * pending when we started, we need to handle it now or we risk
+ * it being ignored forever */
+ if (rc == -ETIMEDOUT && !lwi.lwi_allow_intr &&
+ cfs_signal_pending()) {
+ cfs_sigset_t blocked_sigs =
+ cfs_block_sigsinv(LUSTRE_FATAL_SIGS);
+
+ /* In fact we only interrupt for the "fatal" signals
+ * like SIGINT or SIGKILL. We still ignore less
+ * important signals since ptlrpc set is not easily
+ * reentrant from userspace again */
+ if (cfs_signal_pending())
+ ptlrpc_interrupted_set(set);
+ cfs_restore_sigs(blocked_sigs);
+ }
LASSERT(rc == 0 || rc == -EINTR || rc == -ETIMEDOUT);
/* -EINTR => all requests have been flagged rq_intr so next
* check completes.
- * -ETIMEOUTD => someone timed out. When all reqs have
+ * -ETIMEDOUT => someone timed out. When all reqs have
* timed out, signals are enabled allowing completion with
* EINTR.
* I don't really care if we go once more round the loop in
* the error cases -eeb. */
- } while (rc != 0 || set->set_remaining != 0);
+ if (rc == 0 && cfs_atomic_read(&set->set_remaining) == 0) {
+ cfs_list_for_each(tmp, &set->set_requests) {
+ req = cfs_list_entry(tmp, struct ptlrpc_request,
+ rq_set_chain);
+ cfs_spin_lock(&req->rq_lock);
+ req->rq_invalid_rqset = 1;
+ cfs_spin_unlock(&req->rq_lock);
+ }
+ }
+ } while (rc != 0 || cfs_atomic_read(&set->set_remaining) != 0);
- LASSERT(set->set_remaining == 0);
+ LASSERT(cfs_atomic_read(&set->set_remaining) == 0);
- rc = 0;
- list_for_each(tmp, &set->set_requests) {
- req = list_entry(tmp, struct ptlrpc_request, rq_set_chain);
+ rc = set->set_rc; /* rq_status of already freed requests if any */
+ cfs_list_for_each(tmp, &set->set_requests) {
+ req = cfs_list_entry(tmp, struct ptlrpc_request, rq_set_chain);
LASSERT(req->rq_phase == RQ_PHASE_COMPLETE);
if (req->rq_status != 0)
struct ptlrpc_set_cbdata *cbdata, *n;
int err;
- list_for_each_entry_safe(cbdata, n,
+ cfs_list_for_each_entry_safe(cbdata, n,
&set->set_cblist, psc_item) {
- list_del_init(&cbdata->psc_item);
+ cfs_list_del_init(&cbdata->psc_item);
err = cbdata->psc_interpret(set, cbdata->psc_data, rc);
if (err && !rc)
rc = err;
RETURN(rc);
}
+EXPORT_SYMBOL(ptlrpc_set_wait);
+/**
+ * Helper fuction for request freeing.
+ * Called when request count reached zero and request needs to be freed.
+ * Removes request from all sorts of sending/replay lists it might be on,
+ * frees network buffers if any are present.
+ * If \a locked is set, that means caller is already holding import imp_lock
+ * and so we no longer need to reobtain it (for certain lists manipulations)
+ */
static void __ptlrpc_free_req(struct ptlrpc_request *request, int locked)
{
ENTRY;
LASSERTF(!request->rq_receiving_reply, "req %p\n", request);
LASSERTF(request->rq_rqbd == NULL, "req %p\n",request);/* client-side */
- LASSERTF(list_empty(&request->rq_list), "req %p\n", request);
- LASSERTF(list_empty(&request->rq_set_chain), "req %p\n", request);
+ LASSERTF(cfs_list_empty(&request->rq_list), "req %p\n", request);
+ LASSERTF(cfs_list_empty(&request->rq_set_chain), "req %p\n", request);
+ LASSERTF(cfs_list_empty(&request->rq_exp_list), "req %p\n", request);
LASSERTF(!request->rq_replay, "req %p\n", request);
- LASSERT(request->rq_cli_ctx);
req_capsule_fini(&request->rq_pill);
* request->rq_reqmsg to NULL while osc_close is dereferencing it. */
if (request->rq_import != NULL) {
if (!locked)
- spin_lock(&request->rq_import->imp_lock);
- list_del_init(&request->rq_mod_list);
- list_del_init(&request->rq_replay_list);
+ cfs_spin_lock(&request->rq_import->imp_lock);
+ cfs_list_del_init(&request->rq_replay_list);
if (!locked)
- spin_unlock(&request->rq_import->imp_lock);
+ cfs_spin_unlock(&request->rq_import->imp_lock);
}
- LASSERTF(list_empty(&request->rq_replay_list), "req %p\n", request);
+ LASSERTF(cfs_list_empty(&request->rq_replay_list), "req %p\n", request);
- if (atomic_read(&request->rq_refcount) != 0) {
+ if (cfs_atomic_read(&request->rq_refcount) != 0) {
DEBUG_REQ(D_ERROR, request,
"freeing request with nonzero refcount");
LBUG();
if (request->rq_reqbuf != NULL || request->rq_clrbuf != NULL)
sptlrpc_cli_free_reqbuf(request);
- sptlrpc_req_put_ctx(request, !locked);
+ if (request->rq_cli_ctx)
+ sptlrpc_req_put_ctx(request, !locked);
if (request->rq_pool)
__ptlrpc_free_req_to_pool(request);
}
static int __ptlrpc_req_finished(struct ptlrpc_request *request, int locked);
+/**
+ * Drop one request reference. Must be called with import imp_lock held.
+ * When reference count drops to zero, reuqest is freed.
+ */
void ptlrpc_req_finished_with_imp_lock(struct ptlrpc_request *request)
{
LASSERT_SPIN_LOCKED(&request->rq_import->imp_lock);
(void)__ptlrpc_req_finished(request, 1);
}
+EXPORT_SYMBOL(ptlrpc_req_finished_with_imp_lock);
+/**
+ * Helper function
+ * Drops one reference count for request \a request.
+ * \a locked set indicates that caller holds import imp_lock.
+ * Frees the request whe reference count reaches zero.
+ */
static int __ptlrpc_req_finished(struct ptlrpc_request *request, int locked)
{
ENTRY;
}
DEBUG_REQ(D_INFO, request, "refcount now %u",
- atomic_read(&request->rq_refcount) - 1);
+ cfs_atomic_read(&request->rq_refcount) - 1);
- if (atomic_dec_and_test(&request->rq_refcount)) {
+ if (cfs_atomic_dec_and_test(&request->rq_refcount)) {
__ptlrpc_free_req(request, locked);
RETURN(1);
}
RETURN(0);
}
+/**
+ * Drops one reference count for a request.
+ */
void ptlrpc_req_finished(struct ptlrpc_request *request)
{
__ptlrpc_req_finished(request, 0);
}
+EXPORT_SYMBOL(ptlrpc_req_finished);
+/**
+ * Returns xid of a \a request
+ */
__u64 ptlrpc_req_xid(struct ptlrpc_request *request)
{
return request->rq_xid;
}
EXPORT_SYMBOL(ptlrpc_req_xid);
-/* Disengage the client's reply buffer from the network
+/**
+ * Disengage the client's reply buffer from the network
* NB does _NOT_ unregister any client-side bulk.
* IDEMPOTENT, but _not_ safe against concurrent callers.
* The request owner (i.e. the thread doing the I/O) must call...
+ * Returns 0 on success or 1 if unregistering cannot be made.
*/
-void ptlrpc_unregister_reply (struct ptlrpc_request *request)
+int ptlrpc_unregister_reply(struct ptlrpc_request *request, int async)
{
int rc;
cfs_waitq_t *wq;
struct l_wait_info lwi;
- LASSERT(!in_interrupt ()); /* might sleep */
+ /*
+ * Might sleep.
+ */
+ LASSERT(!cfs_in_interrupt());
+
+ /*
+ * Let's setup deadline for reply unlink.
+ */
+ if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK) &&
+ async && request->rq_reply_deadline == 0)
+ request->rq_reply_deadline = cfs_time_current_sec()+LONG_UNLINK;
+
+ /*
+ * Nothing left to do.
+ */
if (!ptlrpc_client_recv_or_unlink(request))
- /* Nothing left to do */
- return;
+ RETURN(1);
- LNetMDUnlink (request->rq_reply_md_h);
+ LNetMDUnlink(request->rq_reply_md_h);
- /* We have to l_wait_event() whatever the result, to give liblustre
- * a chance to run reply_in_callback(), and to make sure we've
- * unlinked before returning a req to the pool */
+ /*
+ * Let's check it once again.
+ */
+ if (!ptlrpc_client_recv_or_unlink(request))
+ RETURN(1);
+ /*
+ * Move to "Unregistering" phase as reply was not unlinked yet.
+ */
+ ptlrpc_rqphase_move(request, RQ_PHASE_UNREGISTERING);
+
+ /*
+ * Do not wait for unlink to finish.
+ */
+ if (async)
+ RETURN(0);
+
+ /*
+ * We have to l_wait_event() whatever the result, to give liblustre
+ * a chance to run reply_in_callback(), and to make sure we've
+ * unlinked before returning a req to the pool.
+ */
if (request->rq_set != NULL)
wq = &request->rq_set->set_waitq;
else
for (;;) {
/* Network access will complete in finite time but the HUGE
* timeout lets us CWARN for visibility of sluggish NALs */
- lwi = LWI_TIMEOUT(cfs_time_seconds(LONG_UNLINK), NULL, NULL);
- rc = l_wait_event (*wq, !ptlrpc_client_recv_or_unlink(request),
- &lwi);
- if (rc == 0)
- return;
+ lwi = LWI_TIMEOUT_INTERVAL(cfs_time_seconds(LONG_UNLINK),
+ cfs_time_seconds(1), NULL, NULL);
+ rc = l_wait_event(*wq, !ptlrpc_client_recv_or_unlink(request),
+ &lwi);
+ if (rc == 0) {
+ ptlrpc_rqphase_move(request, request->rq_next_phase);
+ RETURN(1);
+ }
- LASSERT (rc == -ETIMEDOUT);
+ LASSERT(rc == -ETIMEDOUT);
DEBUG_REQ(D_WARNING, request, "Unexpectedly long timeout "
"rvcng=%d unlnk=%d", request->rq_receiving_reply,
request->rq_must_unlink);
}
+ RETURN(0);
}
+EXPORT_SYMBOL(ptlrpc_unregister_reply);
-/* caller must hold imp->imp_lock */
+/**
+ * Iterates through replay_list on import and prunes
+ * all requests have transno smaller than last_committed for the
+ * import and don't have rq_replay set.
+ * Since requests are sorted in transno order, stops when meetign first
+ * transno bigger than last_committed.
+ * caller must hold imp->imp_lock
+ */
void ptlrpc_free_committed(struct obd_import *imp)
{
- struct list_head *tmp, *saved;
+ cfs_list_t *tmp, *saved;
struct ptlrpc_request *req;
struct ptlrpc_request *last_req = NULL; /* temporary fire escape */
ENTRY;
if (imp->imp_peer_committed_transno == imp->imp_last_transno_checked &&
imp->imp_generation == imp->imp_last_generation_checked) {
- CDEBUG(D_RPCTRACE, "%s: skip recheck: last_committed "LPU64"\n",
+ CDEBUG(D_INFO, "%s: skip recheck: last_committed "LPU64"\n",
imp->imp_obd->obd_name, imp->imp_peer_committed_transno);
EXIT;
return;
}
-
CDEBUG(D_RPCTRACE, "%s: committing for last_committed "LPU64" gen %d\n",
imp->imp_obd->obd_name, imp->imp_peer_committed_transno,
imp->imp_generation);
imp->imp_last_transno_checked = imp->imp_peer_committed_transno;
imp->imp_last_generation_checked = imp->imp_generation;
- list_for_each_safe(tmp, saved, &imp->imp_replay_list) {
- req = list_entry(tmp, struct ptlrpc_request, rq_replay_list);
+ cfs_list_for_each_safe(tmp, saved, &imp->imp_replay_list) {
+ req = cfs_list_entry(tmp, struct ptlrpc_request,
+ rq_replay_list);
/* XXX ok to remove when 1357 resolved - rread 05/29/03 */
LASSERT(req != last_req);
last_req = req;
+ if (req->rq_transno == 0) {
+ DEBUG_REQ(D_EMERG, req, "zero transno during replay");
+ LBUG();
+ }
if (req->rq_import_generation < imp->imp_generation) {
DEBUG_REQ(D_RPCTRACE, req, "free request with old gen");
GOTO(free_req, 0);
break;
}
- DEBUG_REQ(D_RPCTRACE, req, "commit (last_committed "LPU64")",
+ DEBUG_REQ(D_INFO, req, "commit (last_committed "LPU64")",
imp->imp_peer_committed_transno);
free_req:
- spin_lock(&req->rq_lock);
+ cfs_spin_lock(&req->rq_lock);
req->rq_replay = 0;
- spin_unlock(&req->rq_lock);
+ cfs_spin_unlock(&req->rq_lock);
if (req->rq_commit_cb != NULL)
req->rq_commit_cb(req);
- list_del_init(&req->rq_replay_list);
+ cfs_list_del_init(&req->rq_replay_list);
__ptlrpc_req_finished(req, 1);
}
EXIT;
return;
}
+EXPORT_SYMBOL(ptlrpc_cleanup_client);
+/**
+ * Schedule previously sent request for resend.
+ * For bulk requests we assign new xid (to avoid problems with
+ * lost replies and therefore several transfers landing into same buffer
+ * from different sending attempts).
+ */
void ptlrpc_resend_req(struct ptlrpc_request *req)
{
DEBUG_REQ(D_HA, req, "going to resend");
lustre_msg_set_handle(req->rq_reqmsg, &(struct lustre_handle){ 0 });
req->rq_status = -EAGAIN;
- spin_lock(&req->rq_lock);
+ cfs_spin_lock(&req->rq_lock);
req->rq_resend = 1;
req->rq_net_err = 0;
req->rq_timedout = 0;
CDEBUG(D_HA, "resend bulk old x"LPU64" new x"LPU64"\n",
old_xid, req->rq_xid);
}
- ptlrpc_wake_client_req(req);
- spin_unlock(&req->rq_lock);
+ ptlrpc_client_wake_req(req);
+ cfs_spin_unlock(&req->rq_lock);
}
+EXPORT_SYMBOL(ptlrpc_resend_req);
/* XXX: this function and rq_status are currently unused */
void ptlrpc_restart_req(struct ptlrpc_request *req)
DEBUG_REQ(D_HA, req, "restarting (possibly-)completed request");
req->rq_status = -ERESTARTSYS;
- spin_lock(&req->rq_lock);
+ cfs_spin_lock(&req->rq_lock);
req->rq_restart = 1;
req->rq_timedout = 0;
- ptlrpc_wake_client_req(req);
- spin_unlock(&req->rq_lock);
-}
-
-static int expired_request(void *data)
-{
- struct ptlrpc_request *req = data;
- ENTRY;
-
- /* some failure can suspend regular timeouts */
- if (ptlrpc_check_suspend())
- RETURN(1);
-
- /* deadline may have changed with an early reply */
- if (req->rq_deadline > cfs_time_current_sec())
- RETURN(1);
-
- RETURN(ptlrpc_expire_one_request(req));
-}
-
-static void interrupted_request(void *data)
-{
- struct ptlrpc_request *req = data;
- DEBUG_REQ(D_HA, req, "request interrupted");
- spin_lock(&req->rq_lock);
- req->rq_intr = 1;
- spin_unlock(&req->rq_lock);
+ ptlrpc_client_wake_req(req);
+ cfs_spin_unlock(&req->rq_lock);
}
+EXPORT_SYMBOL(ptlrpc_restart_req);
+/**
+ * Grab additional reference on a request \a req
+ */
struct ptlrpc_request *ptlrpc_request_addref(struct ptlrpc_request *req)
{
ENTRY;
- atomic_inc(&req->rq_refcount);
+ cfs_atomic_inc(&req->rq_refcount);
RETURN(req);
}
+EXPORT_SYMBOL(ptlrpc_request_addref);
+/**
+ * Add a request to import replay_list.
+ * Must be called under imp_lock
+ */
void ptlrpc_retain_replayable_request(struct ptlrpc_request *req,
struct obd_import *imp)
{
- struct list_head *tmp;
+ cfs_list_t *tmp;
LASSERT_SPIN_LOCKED(&imp->imp_lock);
+ if (req->rq_transno == 0) {
+ DEBUG_REQ(D_EMERG, req, "saving request with zero transno");
+ LBUG();
+ }
+
/* clear this for new requests that were resent as well
as resent replayed requests. */
lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
/* don't re-add requests that have been replayed */
- if (!list_empty(&req->rq_replay_list))
+ if (!cfs_list_empty(&req->rq_replay_list))
return;
lustre_msg_add_flags(req->rq_reqmsg, MSG_REPLAY);
LASSERT(imp->imp_replayable);
/* Balanced in ptlrpc_free_committed, usually. */
ptlrpc_request_addref(req);
- list_for_each_prev(tmp, &imp->imp_replay_list) {
+ cfs_list_for_each_prev(tmp, &imp->imp_replay_list) {
struct ptlrpc_request *iter =
- list_entry(tmp, struct ptlrpc_request, rq_replay_list);
+ cfs_list_entry(tmp, struct ptlrpc_request,
+ rq_replay_list);
/* We may have duplicate transnos if we create and then
* open a file, or for closes retained if to match creating
continue;
}
- list_add(&req->rq_replay_list, &iter->rq_replay_list);
+ cfs_list_add(&req->rq_replay_list, &iter->rq_replay_list);
return;
}
- list_add_tail(&req->rq_replay_list, &imp->imp_replay_list);
+ cfs_list_add(&req->rq_replay_list, &imp->imp_replay_list);
}
+EXPORT_SYMBOL(ptlrpc_retain_replayable_request);
+/**
+ * Send request and wait until it completes.
+ * Returns request processing status.
+ */
int ptlrpc_queue_wait(struct ptlrpc_request *req)
{
- int rc = 0;
- int brc;
- struct l_wait_info lwi;
- struct obd_import *imp = req->rq_import;
- cfs_duration_t timeout = CFS_TICK;
- long timeoutl;
+ struct ptlrpc_request_set *set;
+ int rc;
ENTRY;
LASSERT(req->rq_set == NULL);
LASSERT(!req->rq_receiving_reply);
- atomic_inc(&imp->imp_inflight);
-
- /* for distributed debugging */
- lustre_msg_set_status(req->rq_reqmsg, cfs_curproc_pid());
- LASSERT(imp->imp_obd != NULL);
- CDEBUG(D_RPCTRACE, "Sending RPC pname:cluuid:pid:xid:nid:opc "
- "%s:%s:%d:"LPU64":%s:%d\n", cfs_curproc_comm(),
- imp->imp_obd->obd_uuid.uuid,
- lustre_msg_get_status(req->rq_reqmsg), req->rq_xid,
- libcfs_nid2str(imp->imp_connection->c_peer.nid),
- lustre_msg_get_opc(req->rq_reqmsg));
-
- /* Mark phase here for a little debug help */
- req->rq_phase = RQ_PHASE_RPC;
-
- spin_lock(&imp->imp_lock);
- req->rq_import_generation = imp->imp_generation;
-restart:
- if (ptlrpc_import_delay_req(imp, req, &rc)) {
- list_del(&req->rq_list);
-
- list_add_tail(&req->rq_list, &imp->imp_delayed_list);
- spin_unlock(&imp->imp_lock);
-
- DEBUG_REQ(D_HA, req, "\"%s\" waiting for recovery: (%s != %s)",
- cfs_curproc_comm(),
- ptlrpc_import_state_name(req->rq_send_state),
- ptlrpc_import_state_name(imp->imp_state));
- lwi = LWI_INTR(interrupted_request, req);
- rc = l_wait_event(req->rq_reply_waitq,
- (req->rq_send_state == imp->imp_state ||
- req->rq_err || req->rq_intr),
- &lwi);
- DEBUG_REQ(D_HA, req, "\"%s\" awake: (%s == %s or %d/%d == 1)",
- cfs_curproc_comm(),
- ptlrpc_import_state_name(imp->imp_state),
- ptlrpc_import_state_name(req->rq_send_state),
- req->rq_err, req->rq_intr);
-
- spin_lock(&imp->imp_lock);
- list_del_init(&req->rq_list);
-
- if (req->rq_err) {
- /* rq_status was set locally */
- rc = -EIO;
- }
- else if (req->rq_intr) {
- rc = -EINTR;
- }
- else if (req->rq_no_resend) {
- spin_unlock(&imp->imp_lock);
- GOTO(out, rc = -ETIMEDOUT);
- }
- else {
- GOTO(restart, rc);
- }
- }
-
- if (rc != 0) {
- list_del_init(&req->rq_list);
- spin_unlock(&imp->imp_lock);
- req->rq_status = rc; // XXX this ok?
- GOTO(out, rc);
- }
-
- if (req->rq_resend) {
- lustre_msg_add_flags(req->rq_reqmsg, MSG_RESENT);
-
- if (req->rq_bulk != NULL) {
- ptlrpc_unregister_bulk (req);
-
- /* bulk requests are supposed to be
- * idempotent, so we are free to bump the xid
- * here, which we need to do before
- * registering the bulk again (bug 6371).
- * print the old xid first for sanity.
- */
- DEBUG_REQ(D_HA, req, "bumping xid for bulk: ");
- req->rq_xid = ptlrpc_next_xid();
- }
-
- DEBUG_REQ(D_HA, req, "resending: ");
- }
-
- /* XXX this is the same as ptlrpc_set_wait */
- LASSERT(list_empty(&req->rq_list));
- list_add_tail(&req->rq_list, &imp->imp_sending_list);
- spin_unlock(&imp->imp_lock);
-
- rc = sptlrpc_req_refresh_ctx(req, 0);
- if (rc) {
- if (req->rq_err) {
- /* we got fatal ctx refresh error, directly jump out
- * thus we can pass back the actual error code.
- */
- spin_lock(&imp->imp_lock);
- list_del_init(&req->rq_list);
- spin_unlock(&imp->imp_lock);
-
- CERROR("Failed to refresh ctx of req %p: %d\n", req, rc);
- GOTO(out, rc);
- }
- /* simulating we got error during send rpc */
- goto after_send;
- }
-
- rc = ptl_send_rpc(req, 0);
- if (rc)
- DEBUG_REQ(D_HA, req, "send failed (%d); recovering", rc);
-
-repeat:
- timeoutl = req->rq_deadline - cfs_time_current_sec();
- timeout = (timeoutl <= 0 || rc) ? CFS_TICK :
- cfs_time_seconds(timeoutl);
- DEBUG_REQ(D_NET, req,
- "-- sleeping for "CFS_DURATION_T" ticks", timeout);
- lwi = LWI_TIMEOUT_INTR(timeout, expired_request, interrupted_request,
- req);
- brc = l_wait_event(req->rq_reply_waitq, ptlrpc_check_reply(req), &lwi);
- if (brc == -ETIMEDOUT && ((req->rq_deadline > cfs_time_current_sec()) ||
- ptlrpc_check_and_wait_suspend(req)))
- goto repeat;
-
-after_send:
- CDEBUG(D_RPCTRACE, "Completed RPC pname:cluuid:pid:xid:nid:opc "
- "%s:%s:%d:"LPU64":%s:%d\n", cfs_curproc_comm(),
- imp->imp_obd->obd_uuid.uuid,
- lustre_msg_get_status(req->rq_reqmsg), req->rq_xid,
- libcfs_nid2str(imp->imp_connection->c_peer.nid),
- lustre_msg_get_opc(req->rq_reqmsg));
-
- spin_lock(&imp->imp_lock);
- list_del_init(&req->rq_list);
- spin_unlock(&imp->imp_lock);
-
- /* If the reply was received normally, this just grabs the spinlock
- * (ensuring the reply callback has returned), sees that
- * req->rq_receiving_reply is clear and returns. */
- ptlrpc_unregister_reply (req);
-
-
- if (req->rq_err) {
- DEBUG_REQ(D_RPCTRACE, req, "err rc=%d status=%d",
- rc, req->rq_status);
- GOTO(out, rc = rc ? rc : -EIO);
- }
-
- if (req->rq_intr) {
- /* Should only be interrupted if we timed out. */
- if (!req->rq_timedout)
- DEBUG_REQ(D_ERROR, req,
- "rq_intr set but rq_timedout not");
- GOTO(out, rc = -EINTR);
- }
-
- /* Resend if we need to */
- if (req->rq_resend) {
- /* ...unless we were specifically told otherwise. */
- if (req->rq_no_resend)
- GOTO(out, rc = -ETIMEDOUT);
- spin_lock(&imp->imp_lock);
- goto restart;
- }
-
- if (req->rq_timedout) { /* non-recoverable timeout */
- GOTO(out, rc = -ETIMEDOUT);
- }
-
- if (!req->rq_replied) {
- /* How can this be? -eeb */
- DEBUG_REQ(D_ERROR, req, "!rq_replied: ");
- LBUG();
- GOTO(out, rc = req->rq_status);
- }
- rc = after_reply(req);
- /* NB may return +ve success rc */
- if (req->rq_resend) {
- spin_lock(&imp->imp_lock);
- goto restart;
+ set = ptlrpc_prep_set();
+ if (set == NULL) {
+ CERROR("Unable to allocate ptlrpc set.");
+ RETURN(-ENOMEM);
}
- out:
- if (req->rq_bulk != NULL) {
- if (rc >= 0) {
- /* success so far. Note that anything going wrong
- * with bulk now, is EXTREMELY strange, since the
- * server must have believed that the bulk
- * tranferred OK before she replied with success to
- * me. */
- lwi = LWI_TIMEOUT(timeout, NULL, NULL);
- brc = l_wait_event(req->rq_reply_waitq,
- !ptlrpc_bulk_active(req->rq_bulk),
- &lwi);
- LASSERT(brc == 0 || brc == -ETIMEDOUT);
- if (brc != 0) {
- LASSERT(brc == -ETIMEDOUT);
- DEBUG_REQ(D_ERROR, req, "bulk timed out");
- rc = brc;
- } else if (!req->rq_bulk->bd_success) {
- DEBUG_REQ(D_ERROR, req, "bulk transfer failed");
- rc = -EIO;
- }
- }
- if (rc < 0)
- ptlrpc_unregister_bulk (req);
- }
+ /* for distributed debugging */
+ lustre_msg_set_status(req->rq_reqmsg, cfs_curproc_pid());
- LASSERT(!req->rq_receiving_reply);
- req->rq_phase = RQ_PHASE_INTERPRET;
+ /* add a ref for the set (see comment in ptlrpc_set_add_req) */
+ ptlrpc_request_addref(req);
+ ptlrpc_set_add_req(set, req);
+ rc = ptlrpc_set_wait(set);
+ ptlrpc_set_destroy(set);
- atomic_dec(&imp->imp_inflight);
- cfs_waitq_signal(&imp->imp_recovery_waitq);
RETURN(rc);
}
+EXPORT_SYMBOL(ptlrpc_queue_wait);
struct ptlrpc_replay_async_args {
int praa_old_state;
int praa_old_status;
};
-static int ptlrpc_replay_interpret(struct ptlrpc_request *req,
- void * data, int rc)
+/**
+ * Callback used for replayed requests reply processing.
+ * In case of succesful reply calls registeresd request replay callback.
+ * In case of error restart replay process.
+ */
+static int ptlrpc_replay_interpret(const struct lu_env *env,
+ struct ptlrpc_request *req,
+ void * data, int rc)
{
struct ptlrpc_replay_async_args *aa = data;
struct obd_import *imp = req->rq_import;
ENTRY;
- atomic_dec(&imp->imp_replay_inflight);
+ cfs_atomic_dec(&imp->imp_replay_inflight);
- if (!req->rq_replied) {
+ if (!ptlrpc_client_replied(req)) {
CERROR("request replay timed out, restarting recovery\n");
GOTO(out, rc = -ETIMEDOUT);
}
lustre_msg_get_status(req->rq_repmsg) == -ENODEV))
GOTO(out, rc = lustre_msg_get_status(req->rq_repmsg));
- /* The transno had better not change over replay. */
- LASSERT(lustre_msg_get_transno(req->rq_reqmsg) ==
- lustre_msg_get_transno(req->rq_repmsg));
+ /** VBR: check version failure */
+ if (lustre_msg_get_status(req->rq_repmsg) == -EOVERFLOW) {
+ /** replay was failed due to version mismatch */
+ DEBUG_REQ(D_WARNING, req, "Version mismatch during replay\n");
+ cfs_spin_lock(&imp->imp_lock);
+ imp->imp_vbr_failed = 1;
+ imp->imp_no_lock_replay = 1;
+ cfs_spin_unlock(&imp->imp_lock);
+ lustre_msg_set_status(req->rq_repmsg, aa->praa_old_status);
+ } else {
+ /** The transno had better not change over replay. */
+ LASSERTF(lustre_msg_get_transno(req->rq_reqmsg) ==
+ lustre_msg_get_transno(req->rq_repmsg) ||
+ lustre_msg_get_transno(req->rq_repmsg) == 0,
+ LPX64"/"LPX64"\n",
+ lustre_msg_get_transno(req->rq_reqmsg),
+ lustre_msg_get_transno(req->rq_repmsg));
+ }
+
+ cfs_spin_lock(&imp->imp_lock);
+ /** if replays by version then gap was occur on server, no trust to locks */
+ if (lustre_msg_get_flags(req->rq_repmsg) & MSG_VERSION_REPLAY)
+ imp->imp_no_lock_replay = 1;
+ imp->imp_last_replay_transno = lustre_msg_get_transno(req->rq_reqmsg);
+ cfs_spin_unlock(&imp->imp_lock);
+ LASSERT(imp->imp_last_replay_transno);
+
+ /* transaction number shouldn't be bigger than the latest replayed */
+ if (req->rq_transno > lustre_msg_get_transno(req->rq_reqmsg)) {
+ DEBUG_REQ(D_ERROR, req,
+ "Reported transno "LPU64" is bigger than the "
+ "replayed one: "LPU64, req->rq_transno,
+ lustre_msg_get_transno(req->rq_reqmsg));
+ GOTO(out, rc = -EINVAL);
+ }
DEBUG_REQ(D_HA, req, "got rep");
if (req->rq_replay_cb)
req->rq_replay_cb(req);
- if (req->rq_replied &&
+ if (ptlrpc_client_replied(req) &&
lustre_msg_get_status(req->rq_repmsg) != aa->praa_old_status) {
DEBUG_REQ(D_ERROR, req, "status %d, old was %d",
lustre_msg_get_status(req->rq_repmsg),
* Errors while replay can set transno to 0, but
* imp_last_replay_transno shouldn't be set to 0 anyway
*/
- if (req->rq_transno > 0) {
- spin_lock(&imp->imp_lock);
- LASSERT(req->rq_transno <= imp->imp_last_replay_transno);
- imp->imp_last_replay_transno = req->rq_transno;
- spin_unlock(&imp->imp_lock);
- } else
+ if (req->rq_transno == 0)
CERROR("Transno is 0 during replay!\n");
+
/* continue with recovery */
rc = ptlrpc_import_recovery_state_machine(imp);
out:
if (rc != 0)
/* this replay failed, so restart recovery */
- ptlrpc_connect_import(imp, NULL);
+ ptlrpc_connect_import(imp);
RETURN(rc);
}
+/**
+ * Prepares and queues request for replay.
+ * Adds it to ptlrpcd queue for actual sending.
+ * Returns 0 on success.
+ */
int ptlrpc_replay_req(struct ptlrpc_request *req)
{
struct ptlrpc_replay_async_args *aa;
ENTRY;
LASSERT(req->rq_import->imp_state == LUSTRE_IMP_REPLAY);
- /* Not handling automatic bulk replay yet (or ever?) */
- LASSERT(req->rq_bulk == NULL);
LASSERT (sizeof (*aa) <= sizeof (req->rq_async_args));
aa = ptlrpc_req_async_args(req);
aa->praa_old_state = req->rq_send_state;
req->rq_send_state = LUSTRE_IMP_REPLAY;
req->rq_phase = RQ_PHASE_NEW;
+ req->rq_next_phase = RQ_PHASE_UNDEFINED;
if (req->rq_repmsg)
aa->praa_old_status = lustre_msg_get_status(req->rq_repmsg);
req->rq_status = 0;
/* Readjust the timeout for current conditions */
ptlrpc_at_set_req_timeout(req);
+ /* Tell server the net_latency, so the server can calculate how long
+ * it should wait for next replay */
+ lustre_msg_set_service_time(req->rq_reqmsg,
+ ptlrpc_at_get_net_latency(req));
DEBUG_REQ(D_HA, req, "REPLAY");
- atomic_inc(&req->rq_import->imp_replay_inflight);
+ cfs_atomic_inc(&req->rq_import->imp_replay_inflight);
ptlrpc_request_addref(req); /* ptlrpcd needs a ref */
- ptlrpcd_add_req(req);
+ ptlrpcd_add_req(req, PDL_POLICY_LOCAL, -1);
RETURN(0);
}
+EXPORT_SYMBOL(ptlrpc_replay_req);
+/**
+ * Aborts all in-flight request on import \a imp sending and delayed lists
+ */
void ptlrpc_abort_inflight(struct obd_import *imp)
{
- struct list_head *tmp, *n;
+ cfs_list_t *tmp, *n;
ENTRY;
/* Make sure that no new requests get processed for this import.
* ptlrpc_{queue,set}_wait must (and does) hold imp_lock while testing
* this flag and then putting requests on sending_list or delayed_list.
*/
- spin_lock(&imp->imp_lock);
+ cfs_spin_lock(&imp->imp_lock);
/* XXX locking? Maybe we should remove each request with the list
* locked? Also, how do we know if the requests on the list are
* being freed at this time?
*/
- list_for_each_safe(tmp, n, &imp->imp_sending_list) {
+ cfs_list_for_each_safe(tmp, n, &imp->imp_sending_list) {
struct ptlrpc_request *req =
- list_entry(tmp, struct ptlrpc_request, rq_list);
+ cfs_list_entry(tmp, struct ptlrpc_request, rq_list);
DEBUG_REQ(D_RPCTRACE, req, "inflight");
- spin_lock (&req->rq_lock);
+ cfs_spin_lock (&req->rq_lock);
if (req->rq_import_generation < imp->imp_generation) {
req->rq_err = 1;
- req->rq_status = -EINTR;
- ptlrpc_wake_client_req(req);
+ req->rq_status = -EIO;
+ ptlrpc_client_wake_req(req);
}
- spin_unlock (&req->rq_lock);
+ cfs_spin_unlock (&req->rq_lock);
}
- list_for_each_safe(tmp, n, &imp->imp_delayed_list) {
+ cfs_list_for_each_safe(tmp, n, &imp->imp_delayed_list) {
struct ptlrpc_request *req =
- list_entry(tmp, struct ptlrpc_request, rq_list);
+ cfs_list_entry(tmp, struct ptlrpc_request, rq_list);
DEBUG_REQ(D_RPCTRACE, req, "aborting waiting req");
- spin_lock (&req->rq_lock);
+ cfs_spin_lock (&req->rq_lock);
if (req->rq_import_generation < imp->imp_generation) {
req->rq_err = 1;
- req->rq_status = -EINTR;
- ptlrpc_wake_client_req(req);
+ req->rq_status = -EIO;
+ ptlrpc_client_wake_req(req);
}
- spin_unlock (&req->rq_lock);
+ cfs_spin_unlock (&req->rq_lock);
}
/* Last chance to free reqs left on the replay list, but we
if (imp->imp_replayable)
ptlrpc_free_committed(imp);
- spin_unlock(&imp->imp_lock);
+ cfs_spin_unlock(&imp->imp_lock);
EXIT;
}
+EXPORT_SYMBOL(ptlrpc_abort_inflight);
+/**
+ * Abort all uncompleted requests in request set \a set
+ */
void ptlrpc_abort_set(struct ptlrpc_request_set *set)
{
- struct list_head *tmp, *n;
+ cfs_list_t *tmp, *pos;
LASSERT(set != NULL);
- list_for_each_safe(tmp, n, &set->set_requests) {
+ cfs_list_for_each_safe(pos, tmp, &set->set_requests) {
struct ptlrpc_request *req =
- list_entry(tmp, struct ptlrpc_request, rq_set_chain);
+ cfs_list_entry(pos, struct ptlrpc_request,
+ rq_set_chain);
- spin_lock (&req->rq_lock);
+ cfs_spin_lock(&req->rq_lock);
if (req->rq_phase != RQ_PHASE_RPC) {
- spin_unlock (&req->rq_lock);
+ cfs_spin_unlock(&req->rq_lock);
continue;
}
req->rq_err = 1;
req->rq_status = -EINTR;
- ptlrpc_wake_client_req(req);
- spin_unlock (&req->rq_lock);
+ ptlrpc_client_wake_req(req);
+ cfs_spin_unlock(&req->rq_lock);
}
}
static __u64 ptlrpc_last_xid;
-static spinlock_t ptlrpc_last_xid_lock;
+static cfs_spinlock_t ptlrpc_last_xid_lock;
-/* Initialize the XID for the node. This is common among all requests on
+/**
+ * Initialize the XID for the node. This is common among all requests on
* this node, and only requires the property that it is monotonically
* increasing. It does not need to be sequential. Since this is also used
* as the RDMA match bits, it is important that a single client NOT have
* NOT want to have an XID per target or similar.
*
* To avoid an unlikely collision between match bits after a client reboot
- * (which would cause old to be delivered into the wrong buffer) we initialize
+ * (which would deliver old data into the wrong RDMA buffer) initialize
* the XID based on the current time, assuming a maximum RPC rate of 1M RPC/s.
* If the time is clearly incorrect, we instead use a 62-bit random number.
* In the worst case the random number will overflow 1M RPCs per second in
{
time_t now = cfs_time_current_sec();
- spin_lock_init(&ptlrpc_last_xid_lock);
+ cfs_spin_lock_init(&ptlrpc_last_xid_lock);
if (now < YEAR_2004) {
- ll_get_random_bytes(&ptlrpc_last_xid, sizeof(ptlrpc_last_xid));
+ cfs_get_random_bytes(&ptlrpc_last_xid, sizeof(ptlrpc_last_xid));
ptlrpc_last_xid >>= 2;
ptlrpc_last_xid |= (1ULL << 61);
} else {
- ptlrpc_last_xid = (now << 20);
+ ptlrpc_last_xid = (__u64)now << 20;
}
}
+/**
+ * Increase xid and returns resultng new value to the caller.
+ */
__u64 ptlrpc_next_xid(void)
{
__u64 tmp;
- spin_lock(&ptlrpc_last_xid_lock);
+ cfs_spin_lock(&ptlrpc_last_xid_lock);
tmp = ++ptlrpc_last_xid;
- spin_unlock(&ptlrpc_last_xid_lock);
+ cfs_spin_unlock(&ptlrpc_last_xid_lock);
return tmp;
}
+EXPORT_SYMBOL(ptlrpc_next_xid);
+/**
+ * Get a glimpse at what next xid value might have been.
+ * Returns possible next xid.
+ */
__u64 ptlrpc_sample_next_xid(void)
{
#if BITS_PER_LONG == 32
/* need to avoid possible word tearing on 32-bit systems */
__u64 tmp;
- spin_lock(&ptlrpc_last_xid_lock);
+ cfs_spin_lock(&ptlrpc_last_xid_lock);
tmp = ptlrpc_last_xid + 1;
- spin_unlock(&ptlrpc_last_xid_lock);
+ cfs_spin_unlock(&ptlrpc_last_xid_lock);
return tmp;
#else
/* No need to lock, since returned value is racy anyways */
#endif
}
EXPORT_SYMBOL(ptlrpc_sample_next_xid);
+
+/**
+ * Functions for operating ptlrpc workers.
+ *
+ * A ptlrpc work is a function which will be running inside ptlrpc context.
+ * The callback shouldn't sleep otherwise it will block that ptlrpcd thread.
+ *
+ * 1. after a work is created, it can be used many times, that is:
+ * handler = ptlrpcd_alloc_work();
+ * ptlrpcd_queue_work();
+ *
+ * queue it again when necessary:
+ * ptlrpcd_queue_work();
+ * ptlrpcd_destroy_work();
+ * 2. ptlrpcd_queue_work() can be called by multiple processes meanwhile, but
+ * it will only be queued once in any time. Also as its name implies, it may
+ * have delay before it really runs by ptlrpcd thread.
+ */
+struct ptlrpc_work_async_args {
+ __u64 magic;
+ int (*cb)(const struct lu_env *, void *);
+ void *cbdata;
+};
+
+#define PTLRPC_WORK_MAGIC 0x6655436b676f4f44ULL /* magic code */
+
+static int work_interpreter(const struct lu_env *env,
+ struct ptlrpc_request *req, void *data, int rc)
+{
+ struct ptlrpc_work_async_args *arg = data;
+
+ LASSERT(arg->magic == PTLRPC_WORK_MAGIC);
+ LASSERT(arg->cb != NULL);
+
+ return arg->cb(env, arg->cbdata);
+}
+
+/**
+ * Create a work for ptlrpc.
+ */
+void *ptlrpcd_alloc_work(struct obd_import *imp,
+ int (*cb)(const struct lu_env *, void *), void *cbdata)
+{
+ struct ptlrpc_request *req = NULL;
+ struct ptlrpc_work_async_args *args;
+ ENTRY;
+
+ cfs_might_sleep();
+
+ if (cb == NULL)
+ RETURN(ERR_PTR(-EINVAL));
+
+ /* copy some code from deprecated fakereq. */
+ OBD_ALLOC_PTR(req);
+ if (req == NULL) {
+ CERROR("ptlrpc: run out of memory!\n");
+ RETURN(ERR_PTR(-ENOMEM));
+ }
+
+ req->rq_send_state = LUSTRE_IMP_FULL;
+ req->rq_type = PTL_RPC_MSG_REQUEST;
+ req->rq_import = class_import_get(imp);
+ req->rq_export = NULL;
+ req->rq_interpret_reply = work_interpreter;
+ /* don't want reply */
+ req->rq_receiving_reply = 0;
+ req->rq_must_unlink = 0;
+ req->rq_no_delay = req->rq_no_resend = 1;
+
+ cfs_spin_lock_init(&req->rq_lock);
+ CFS_INIT_LIST_HEAD(&req->rq_list);
+ CFS_INIT_LIST_HEAD(&req->rq_replay_list);
+ CFS_INIT_LIST_HEAD(&req->rq_set_chain);
+ CFS_INIT_LIST_HEAD(&req->rq_history_list);
+ CFS_INIT_LIST_HEAD(&req->rq_exp_list);
+ cfs_waitq_init(&req->rq_reply_waitq);
+ cfs_waitq_init(&req->rq_set_waitq);
+ cfs_atomic_set(&req->rq_refcount, 1);
+
+ CLASSERT (sizeof(*args) <= sizeof(req->rq_async_args));
+ args = ptlrpc_req_async_args(req);
+ args->magic = PTLRPC_WORK_MAGIC;
+ args->cb = cb;
+ args->cbdata = cbdata;
+
+ RETURN(req);
+}
+EXPORT_SYMBOL(ptlrpcd_alloc_work);
+
+void ptlrpcd_destroy_work(void *handler)
+{
+ struct ptlrpc_request *req = handler;
+
+ if (req)
+ ptlrpc_req_finished(req);
+}
+EXPORT_SYMBOL(ptlrpcd_destroy_work);
+
+int ptlrpcd_queue_work(void *handler)
+{
+ struct ptlrpc_request *req = handler;
+
+ /*
+ * Check if the req is already being queued.
+ *
+ * Here comes a trick: it lacks a way of checking if a req is being
+ * processed reliably in ptlrpc. Here I have to use refcount of req
+ * for this purpose. This is okay because the caller should use this
+ * req as opaque data. - Jinshan
+ */
+ LASSERT(cfs_atomic_read(&req->rq_refcount) > 0);
+ if (cfs_atomic_read(&req->rq_refcount) > 1)
+ return -EBUSY;
+
+ if (cfs_atomic_inc_return(&req->rq_refcount) > 2) { /* race */
+ cfs_atomic_dec(&req->rq_refcount);
+ return -EBUSY;
+ }
+
+ /* re-initialize the req */
+ req->rq_timeout = obd_timeout;
+ req->rq_sent = cfs_time_current_sec();
+ req->rq_deadline = req->rq_sent + req->rq_timeout;
+ req->rq_reply_deadline = req->rq_deadline;
+ req->rq_phase = RQ_PHASE_INTERPRET;
+ req->rq_next_phase = RQ_PHASE_COMPLETE;
+ req->rq_xid = ptlrpc_next_xid();
+ req->rq_import_generation = req->rq_import->imp_generation;
+
+ ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
+ return 0;
+}
+EXPORT_SYMBOL(ptlrpcd_queue_work);
git://git.whamcloud.com / fs / lustre-release.git / blobdiff