-/* -*- 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.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
*
- * lustre/fld/fld_request.c
- * FLD (Fids Location Database)
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
*
- * Copyright (C) 2006 Cluster File Systems, Inc.
- * Author: Yury Umanets <umka@clusterfs.com>
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
*
- * This file is part of the Lustre file system, http://www.lustre.org
- * Lustre is a trademark of Cluster File Systems, Inc.
+ * Copyright (c) 2011, 2015, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
*
- * You may have signed or agreed to another license before downloading
- * this software. If so, you are bound by the terms and conditions
- * of that agreement, and the following does not apply to you. See the
- * LICENSE file included with this distribution for more information.
+ * lustre/fld/fld_request.c
*
- * If you did not agree to a different license, then this copy of Lustre
- * is open source software; you can redistribute it and/or modify it
- * under the terms of version 2 of the GNU General Public License as
- * published by the Free Software Foundation.
+ * FLD (Fids Location Database)
*
- * In either case, Lustre is distributed in the hope that it will be
- * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
- * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * license text for more details.
+ * Author: Yury Umanets <umka@clusterfs.com>
*/
-#ifndef EXPORT_SYMTAB
-# define EXPORT_SYMTAB
-#endif
+
#define DEBUG_SUBSYSTEM S_FLD
-#ifdef __KERNEL__
-# include <libcfs/libcfs.h>
-# include <linux/module.h>
-# include <linux/jbd.h>
-# include <asm/div64.h>
-#else /* __KERNEL__ */
-# include <liblustre.h>
-# include <libcfs/list.h>
-#endif
+#include <libcfs/libcfs.h>
+#include <linux/module.h>
+#include <linux/math64.h>
#include <obd.h>
#include <obd_class.h>
-#include <lustre_ver.h>
#include <obd_support.h>
#include <lprocfs_status.h>
-
-#include <dt_object.h>
-#include <md_object.h>
#include <lustre_req_layout.h>
#include <lustre_fld.h>
#include <lustre_mdc.h>
#include "fld_internal.h"
-/* TODO: these 3 functions are copies of flow-control code from mdc_lib.c
- * It should be common thing. The same about mdc RPC lock */
-static int fld_req_avail(struct client_obd *cli, struct mdc_cache_waiter *mcw)
+static int fld_rrb_hash(struct lu_client_fld *fld, u64 seq)
{
- int rc;
- ENTRY;
- spin_lock(&cli->cl_loi_list_lock);
- rc = list_empty(&mcw->mcw_entry);
- spin_unlock(&cli->cl_loi_list_lock);
- RETURN(rc);
-};
-
-static void fld_enter_request(struct client_obd *cli)
-{
- struct mdc_cache_waiter mcw;
- struct l_wait_info lwi = { 0 };
-
- spin_lock(&cli->cl_loi_list_lock);
- if (cli->cl_r_in_flight >= cli->cl_max_rpcs_in_flight) {
- list_add_tail(&mcw.mcw_entry, &cli->cl_cache_waiters);
- cfs_waitq_init(&mcw.mcw_waitq);
- spin_unlock(&cli->cl_loi_list_lock);
- l_wait_event(mcw.mcw_waitq, fld_req_avail(cli, &mcw), &lwi);
- } else {
- cli->cl_r_in_flight++;
- spin_unlock(&cli->cl_loi_list_lock);
- }
-}
-
-static void fld_exit_request(struct client_obd *cli)
-{
- struct list_head *l, *tmp;
- struct mdc_cache_waiter *mcw;
-
- spin_lock(&cli->cl_loi_list_lock);
- cli->cl_r_in_flight--;
- list_for_each_safe(l, tmp, &cli->cl_cache_waiters) {
-
- if (cli->cl_r_in_flight >= cli->cl_max_rpcs_in_flight) {
- /* No free request slots anymore */
- break;
- }
-
- mcw = list_entry(l, struct mdc_cache_waiter, mcw_entry);
- list_del_init(&mcw->mcw_entry);
- cli->cl_r_in_flight++;
- cfs_waitq_signal(&mcw->mcw_waitq);
- }
- spin_unlock(&cli->cl_loi_list_lock);
-}
-
-static int fld_rrb_hash(struct lu_client_fld *fld,
- seqno_t seq)
-{
- LASSERT(fld->lcf_count > 0);
- return do_div(seq, fld->lcf_count);
+ LASSERT(fld->lcf_count > 0);
+ return do_div(seq, fld->lcf_count);
}
static struct lu_fld_target *
-fld_rrb_scan(struct lu_client_fld *fld, seqno_t seq)
+fld_rrb_scan(struct lu_client_fld *fld, u64 seq)
{
struct lu_fld_target *target;
int hash;
ENTRY;
- hash = fld_rrb_hash(fld, seq);
-
- list_for_each_entry(target, &fld->lcf_targets, ft_chain) {
+ /* Because almost all of special sequence located in MDT0,
+ * it should go to index 0 directly, instead of calculating
+ * hash again, and also if other MDTs is not being connected,
+ * the fld lookup requests(for seq on MDT0) should not be
+ * blocked because of other MDTs */
+ if (fid_seq_is_norm(seq))
+ hash = fld_rrb_hash(fld, seq);
+ else
+ hash = 0;
+
+again:
+ list_for_each_entry(target, &fld->lcf_targets, ft_chain) {
if (target->ft_idx == hash)
RETURN(target);
}
+ if (hash != 0) {
+ /* It is possible the remote target(MDT) are not connected to
+ * with client yet, so we will refer this to MDT0, which should
+ * be connected during mount */
+ hash = 0;
+ goto again;
+ }
+
CERROR("%s: Can't find target by hash %d (seq "LPX64"). "
"Targets (%d):\n", fld->lcf_name, hash, seq,
fld->lcf_count);
- list_for_each_entry(target, &fld->lcf_targets, ft_chain) {
+ list_for_each_entry(target, &fld->lcf_targets, ft_chain) {
const char *srv_name = target->ft_srv != NULL ?
target->ft_srv->lsf_name : "<null>";
const char *exp_name = target->ft_exp != NULL ?
RETURN(NULL);
}
-static int fld_dht_hash(struct lu_client_fld *fld,
- seqno_t seq)
-{
- /* XXX: here should be DHT hash */
- return fld_rrb_hash(fld, seq);
-}
-
-static struct lu_fld_target *
-fld_dht_scan(struct lu_client_fld *fld, seqno_t seq)
-{
- /* XXX: here should be DHT scan code */
- return fld_rrb_scan(fld, seq);
-}
-
-struct lu_fld_hash fld_hash[3] = {
- {
- .fh_name = "DHT",
- .fh_hash_func = fld_dht_hash,
- .fh_scan_func = fld_dht_scan
- },
+struct lu_fld_hash fld_hash[] = {
{
.fh_name = "RRB",
.fh_hash_func = fld_rrb_hash,
.fh_scan_func = fld_rrb_scan
},
{
- 0,
+ NULL,
}
};
static struct lu_fld_target *
-fld_client_get_target(struct lu_client_fld *fld,
- seqno_t seq)
+fld_client_get_target(struct lu_client_fld *fld, u64 seq)
{
- struct lu_fld_target *target;
- ENTRY;
+ struct lu_fld_target *target;
+ ENTRY;
- LASSERT(fld->lcf_hash != NULL);
+ LASSERT(fld->lcf_hash != NULL);
- spin_lock(&fld->lcf_lock);
- target = fld->lcf_hash->fh_scan_func(fld, seq);
- spin_unlock(&fld->lcf_lock);
+ spin_lock(&fld->lcf_lock);
+ target = fld->lcf_hash->fh_scan_func(fld, seq);
+ spin_unlock(&fld->lcf_lock);
if (target != NULL) {
CDEBUG(D_INFO, "%s: Found target (idx "LPU64
int fld_client_add_target(struct lu_client_fld *fld,
struct lu_fld_target *tar)
{
- const char *name = fld_target_name(tar);
+ const char *name;
struct lu_fld_target *target, *tmp;
ENTRY;
LASSERT(tar != NULL);
+ name = fld_target_name(tar);
LASSERT(name != NULL);
LASSERT(tar->ft_srv != NULL || tar->ft_exp != NULL);
- if (fld->lcf_flags != LUSTRE_FLD_INIT) {
- CERROR("%s: Attempt to add target %s (idx "LPU64") "
- "on fly - skip it\n", fld->lcf_name, name,
- tar->ft_idx);
- RETURN(0);
- } else {
- CDEBUG(D_INFO, "%s: Adding target %s (idx "
- LPU64")\n", fld->lcf_name, name, tar->ft_idx);
- }
+ CDEBUG(D_INFO, "%s: Adding target %s (idx "LPU64")\n", fld->lcf_name,
+ name, tar->ft_idx);
OBD_ALLOC_PTR(target);
if (target == NULL)
RETURN(-ENOMEM);
- spin_lock(&fld->lcf_lock);
- list_for_each_entry(tmp, &fld->lcf_targets, ft_chain) {
- if (tmp->ft_idx == tar->ft_idx) {
- spin_unlock(&fld->lcf_lock);
+ spin_lock(&fld->lcf_lock);
+ list_for_each_entry(tmp, &fld->lcf_targets, ft_chain) {
+ if (tmp->ft_idx == tar->ft_idx) {
+ spin_unlock(&fld->lcf_lock);
OBD_FREE_PTR(target);
CERROR("Target %s exists in FLD and known as %s:#"LPU64"\n",
name, fld_target_name(tmp), tmp->ft_idx);
target->ft_srv = tar->ft_srv;
target->ft_idx = tar->ft_idx;
- list_add_tail(&target->ft_chain,
- &fld->lcf_targets);
+ list_add_tail(&target->ft_chain, &fld->lcf_targets);
fld->lcf_count++;
- spin_unlock(&fld->lcf_lock);
+ spin_unlock(&fld->lcf_lock);
- RETURN(0);
+ RETURN(0);
}
EXPORT_SYMBOL(fld_client_add_target);
/* Remove export from FLD */
-int fld_client_del_target(struct lu_client_fld *fld,
- __u64 idx)
+int fld_client_del_target(struct lu_client_fld *fld, __u64 idx)
{
- struct lu_fld_target *target, *tmp;
- ENTRY;
+ struct lu_fld_target *target, *tmp;
+ ENTRY;
- spin_lock(&fld->lcf_lock);
- list_for_each_entry_safe(target, tmp,
- &fld->lcf_targets, ft_chain) {
- if (target->ft_idx == idx) {
- fld->lcf_count--;
- list_del(&target->ft_chain);
- spin_unlock(&fld->lcf_lock);
+ spin_lock(&fld->lcf_lock);
+ list_for_each_entry_safe(target, tmp, &fld->lcf_targets, ft_chain) {
+ if (target->ft_idx == idx) {
+ fld->lcf_count--;
+ list_del(&target->ft_chain);
+ spin_unlock(&fld->lcf_lock);
if (target->ft_exp != NULL)
class_export_put(target->ft_exp);
RETURN(0);
}
}
- spin_unlock(&fld->lcf_lock);
- RETURN(-ENOENT);
+ spin_unlock(&fld->lcf_lock);
+ RETURN(-ENOENT);
}
-EXPORT_SYMBOL(fld_client_del_target);
-
-static void fld_client_proc_fini(struct lu_client_fld *fld);
-#ifdef LPROCFS
+#ifdef CONFIG_PROC_FS
static int fld_client_proc_init(struct lu_client_fld *fld)
{
- int rc;
- ENTRY;
-
- fld->lcf_proc_dir = lprocfs_register(fld->lcf_name,
- fld_type_proc_dir,
- NULL, NULL);
-
- if (IS_ERR(fld->lcf_proc_dir)) {
- CERROR("%s: LProcFS failed in fld-init\n",
- fld->lcf_name);
- rc = PTR_ERR(fld->lcf_proc_dir);
- RETURN(rc);
- }
-
- rc = lprocfs_add_vars(fld->lcf_proc_dir,
- fld_client_proc_list, fld);
- if (rc) {
- CERROR("%s: Can't init FLD proc, rc %d\n",
- fld->lcf_name, rc);
- GOTO(out_cleanup, rc);
- }
-
- RETURN(0);
+ int rc;
+ ENTRY;
+
+ fld->lcf_proc_dir = lprocfs_register(fld->lcf_name, fld_type_proc_dir,
+ NULL, NULL);
+ if (IS_ERR(fld->lcf_proc_dir)) {
+ CERROR("%s: LProcFS failed in fld-init\n",
+ fld->lcf_name);
+ rc = PTR_ERR(fld->lcf_proc_dir);
+ RETURN(rc);
+ }
+
+ rc = lprocfs_add_vars(fld->lcf_proc_dir, fld_client_proc_list, fld);
+ if (rc) {
+ CERROR("%s: Can't init FLD proc, rc %d\n",
+ fld->lcf_name, rc);
+ GOTO(out_cleanup, rc);
+ }
+
+ RETURN(0);
out_cleanup:
- fld_client_proc_fini(fld);
- return rc;
+ fld_client_proc_fini(fld);
+ return rc;
}
-static void fld_client_proc_fini(struct lu_client_fld *fld)
+void fld_client_proc_fini(struct lu_client_fld *fld)
{
ENTRY;
if (fld->lcf_proc_dir) {
}
EXIT;
}
-#else
+#else /* !CONFIG_PROC_FS */
static int fld_client_proc_init(struct lu_client_fld *fld)
{
return 0;
}
-static void fld_client_proc_fini(struct lu_client_fld *fld)
+void fld_client_proc_fini(struct lu_client_fld *fld)
{
return;
}
-#endif
+#endif /* CONFIG_PROC_FS */
+
+EXPORT_SYMBOL(fld_client_proc_fini);
static inline int hash_is_sane(int hash)
{
int fld_client_init(struct lu_client_fld *fld,
const char *prefix, int hash)
{
-#ifdef __KERNEL__
int cache_size, cache_threshold;
-#endif
int rc;
ENTRY;
RETURN(-EINVAL);
}
- fld->lcf_count = 0;
- spin_lock_init(&fld->lcf_lock);
- fld->lcf_hash = &fld_hash[hash];
- fld->lcf_flags = LUSTRE_FLD_INIT;
- INIT_LIST_HEAD(&fld->lcf_targets);
+ fld->lcf_count = 0;
+ spin_lock_init(&fld->lcf_lock);
+ fld->lcf_hash = &fld_hash[hash];
+ INIT_LIST_HEAD(&fld->lcf_targets);
-#ifdef __KERNEL__
cache_size = FLD_CLIENT_CACHE_SIZE /
sizeof(struct fld_cache_entry);
FLD_CLIENT_CACHE_THRESHOLD / 100;
fld->lcf_cache = fld_cache_init(fld->lcf_name,
- FLD_CLIENT_HTABLE_SIZE,
cache_size, cache_threshold);
if (IS_ERR(fld->lcf_cache)) {
rc = PTR_ERR(fld->lcf_cache);
fld->lcf_cache = NULL;
GOTO(out, rc);
}
-#endif
rc = fld_client_proc_init(fld);
if (rc)
void fld_client_fini(struct lu_client_fld *fld)
{
- struct lu_fld_target *target, *tmp;
- ENTRY;
-
- fld_client_proc_fini(fld);
+ struct lu_fld_target *target, *tmp;
+ ENTRY;
- spin_lock(&fld->lcf_lock);
- list_for_each_entry_safe(target, tmp,
- &fld->lcf_targets, ft_chain) {
+ spin_lock(&fld->lcf_lock);
+ list_for_each_entry_safe(target, tmp, &fld->lcf_targets, ft_chain) {
fld->lcf_count--;
- list_del(&target->ft_chain);
+ list_del(&target->ft_chain);
if (target->ft_exp != NULL)
class_export_put(target->ft_exp);
OBD_FREE_PTR(target);
}
- spin_unlock(&fld->lcf_lock);
+ spin_unlock(&fld->lcf_lock);
-#ifdef __KERNEL__
if (fld->lcf_cache != NULL) {
if (!IS_ERR(fld->lcf_cache))
fld_cache_fini(fld->lcf_cache);
fld->lcf_cache = NULL;
}
-#endif
EXIT;
}
EXPORT_SYMBOL(fld_client_fini);
-static int fld_client_rpc(struct obd_export *exp,
- struct md_fld *mf, __u32 fld_op)
+int fld_client_rpc(struct obd_export *exp,
+ struct lu_seq_range *range, __u32 fld_op,
+ struct ptlrpc_request **reqp)
{
- struct ptlrpc_request *req;
- struct md_fld *pmf;
- __u32 *op;
- int rc;
- ENTRY;
-
- LASSERT(exp != NULL);
-
- req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp), &RQF_FLD_QUERY,
- LUSTRE_MDS_VERSION, FLD_QUERY);
- if (req == NULL)
- RETURN(-ENOMEM);
-
- op = req_capsule_client_get(&req->rq_pill, &RMF_FLD_OPC);
- *op = fld_op;
-
- pmf = req_capsule_client_get(&req->rq_pill, &RMF_FLD_MDFLD);
- *pmf = *mf;
-
- ptlrpc_request_set_replen(req);
+ struct ptlrpc_request *req = NULL;
+ struct lu_seq_range *prange;
+ __u32 *op;
+ int rc = 0;
+ struct obd_import *imp;
+ ENTRY;
+
+ LASSERT(exp != NULL);
+
+again:
+ imp = class_exp2cliimp(exp);
+ switch (fld_op) {
+ case FLD_QUERY:
+ req = ptlrpc_request_alloc_pack(imp, &RQF_FLD_QUERY,
+ LUSTRE_MDS_VERSION, FLD_QUERY);
+ if (req == NULL)
+ RETURN(-ENOMEM);
+
+ /* XXX: only needed when talking to old server(< 2.6), it should
+ * be removed when < 2.6 server is not supported */
+ op = req_capsule_client_get(&req->rq_pill, &RMF_FLD_OPC);
+ *op = FLD_LOOKUP;
+
+ /* For MDS_MDS seq lookup, it will always use LWP connection,
+ * but LWP will be evicted after restart, so cause the error.
+ * so we will set no_delay for seq lookup request, once the
+ * request fails because of the eviction. always retry here */
+ if (imp->imp_connect_flags_orig & OBD_CONNECT_MDS_MDS) {
+ req->rq_allow_replay = 1;
+ req->rq_no_delay = 1;
+ }
+ break;
+ case FLD_READ:
+ req = ptlrpc_request_alloc_pack(imp, &RQF_FLD_READ,
+ LUSTRE_MDS_VERSION, FLD_READ);
+ if (req == NULL)
+ RETURN(-ENOMEM);
+
+ req_capsule_set_size(&req->rq_pill, &RMF_GENERIC_DATA,
+ RCL_SERVER, PAGE_CACHE_SIZE);
+ break;
+ default:
+ rc = -EINVAL;
+ break;
+ }
+
+ if (rc != 0)
+ RETURN(rc);
+
+ prange = req_capsule_client_get(&req->rq_pill, &RMF_FLD_MDFLD);
+ *prange = *range;
+ ptlrpc_request_set_replen(req);
req->rq_request_portal = FLD_REQUEST_PORTAL;
-
- if (fld_op != FLD_LOOKUP)
- mdc_get_rpc_lock(exp->exp_obd->u.cli.cl_rpc_lock, NULL);
- fld_enter_request(&exp->exp_obd->u.cli);
- rc = ptlrpc_queue_wait(req);
- fld_exit_request(&exp->exp_obd->u.cli);
- if (fld_op != FLD_LOOKUP)
- mdc_put_rpc_lock(exp->exp_obd->u.cli.cl_rpc_lock, NULL);
- if (rc)
- GOTO(out_req, rc);
-
- pmf = req_capsule_server_get(&req->rq_pill, &RMF_FLD_MDFLD);
- if (pmf == NULL)
- GOTO(out_req, rc = -EFAULT);
- *mf = *pmf;
- EXIT;
+ req->rq_reply_portal = MDC_REPLY_PORTAL;
+ ptlrpc_at_set_req_timeout(req);
+
+ obd_get_request_slot(&exp->exp_obd->u.cli);
+ rc = ptlrpc_queue_wait(req);
+ obd_put_request_slot(&exp->exp_obd->u.cli);
+
+ if (rc == -ENOENT) {
+ /* Don't loop forever on non-existing FID sequences. */
+ GOTO(out_req, rc);
+ }
+
+ if (rc != 0) {
+ if (imp->imp_state != LUSTRE_IMP_CLOSED && !imp->imp_deactive) {
+ /* Since LWP is not replayable, so it will keep
+ * trying unless umount happens, otherwise it would
+ * cause unecessary failure of the application. */
+ ptlrpc_req_finished(req);
+ rc = 0;
+ goto again;
+ }
+ GOTO(out_req, rc);
+ }
+
+ if (fld_op == FLD_QUERY) {
+ prange = req_capsule_server_get(&req->rq_pill,
+ &RMF_FLD_MDFLD);
+ if (prange == NULL)
+ GOTO(out_req, rc = -EFAULT);
+ *range = *prange;
+ }
+
+ EXIT;
out_req:
- ptlrpc_req_finished(req);
- return rc;
-}
+ if (rc != 0 || reqp == NULL) {
+ ptlrpc_req_finished(req);
+ req = NULL;
+ }
-int fld_client_create(struct lu_client_fld *fld,
- seqno_t seq, mdsno_t mds,
- const struct lu_env *env)
-{
- struct md_fld md_fld = { .mf_seq = seq, .mf_mds = mds };
- struct lu_fld_target *target;
- int rc;
- ENTRY;
+ if (reqp != NULL)
+ *reqp = req;
- fld->lcf_flags |= LUSTRE_FLD_RUN;
- target = fld_client_get_target(fld, seq);
- LASSERT(target != NULL);
-
- CDEBUG(D_INFO, "%s: Create fld entry (seq: "LPX64"; mds: "
- LPU64") on target %s (idx "LPU64")\n", fld->lcf_name,
- seq, mds, fld_target_name(target), target->ft_idx);
-
-#ifdef __KERNEL__
- if (target->ft_srv != NULL) {
- LASSERT(env != NULL);
- rc = fld_server_create(target->ft_srv, env, seq, mds);
- } else {
-#endif
- rc = fld_client_rpc(target->ft_exp, &md_fld, FLD_CREATE);
-#ifdef __KERNEL__
- }
-#endif
-
- if (rc == 0) {
- /*
- * Do not return result of calling fld_cache_insert()
- * here. First of all because it may return -EEXISTS. Another
- * reason is that, we do not want to stop proceeding because of
- * cache errors.
- */
- fld_cache_insert(fld->lcf_cache, seq, mds);
- } else {
- CERROR("%s: Can't create FLD entry, rc %d\n",
- fld->lcf_name, rc);
- }
-
- RETURN(rc);
+ return rc;
}
-EXPORT_SYMBOL(fld_client_create);
-int fld_client_delete(struct lu_client_fld *fld, seqno_t seq,
- const struct lu_env *env)
+int fld_client_lookup(struct lu_client_fld *fld, u64 seq, u32 *mds,
+ __u32 flags, const struct lu_env *env)
{
- struct md_fld md_fld = { .mf_seq = seq, .mf_mds = 0 };
- struct lu_fld_target *target;
- int rc;
- ENTRY;
-
- fld->lcf_flags |= LUSTRE_FLD_RUN;
- fld_cache_delete(fld->lcf_cache, seq);
+ struct lu_seq_range res = { 0 };
+ struct lu_fld_target *target;
+ struct lu_fld_target *origin;
+ int rc;
+ ENTRY;
+
+ rc = fld_cache_lookup(fld->lcf_cache, seq, &res);
+ if (rc == 0) {
+ *mds = res.lsr_index;
+ RETURN(0);
+ }
+ /* Can not find it in the cache */
target = fld_client_get_target(fld, seq);
LASSERT(target != NULL);
-
- CDEBUG(D_INFO, "%s: Delete fld entry (seq: "LPX64") on "
+ origin = target;
+again:
+ CDEBUG(D_INFO, "%s: Lookup fld entry (seq: "LPX64") on "
"target %s (idx "LPU64")\n", fld->lcf_name, seq,
fld_target_name(target), target->ft_idx);
-#ifdef __KERNEL__
- if (target->ft_srv != NULL) {
- LASSERT(env != NULL);
- rc = fld_server_delete(target->ft_srv,
- env, seq);
- } else {
-#endif
- rc = fld_client_rpc(target->ft_exp,
- &md_fld, FLD_DELETE);
-#ifdef __KERNEL__
- }
-#endif
-
- RETURN(rc);
+ res.lsr_start = seq;
+ fld_range_set_type(&res, flags);
+
+#ifdef HAVE_SERVER_SUPPORT
+ if (target->ft_srv != NULL) {
+ LASSERT(env != NULL);
+ rc = fld_server_lookup(env, target->ft_srv, seq, &res);
+ } else
+#endif /* HAVE_SERVER_SUPPORT */
+ {
+ rc = fld_client_rpc(target->ft_exp, &res, FLD_QUERY, NULL);
+ }
+
+ if (rc == -ESHUTDOWN) {
+ /* If fld lookup failed because the target has been shutdown,
+ * then try next target in the list, until trying all targets
+ * or fld lookup succeeds */
+ spin_lock(&fld->lcf_lock);
+
+ /* If the next entry in the list is the head of the list,
+ * move to the next entry after the head and retrieve
+ * the target. Else retreive the next target entry. */
+
+ if (target->ft_chain.next == &fld->lcf_targets)
+ target = list_entry(target->ft_chain.next->next,
+ struct lu_fld_target, ft_chain);
+ else
+ target = list_entry(target->ft_chain.next,
+ struct lu_fld_target,
+ ft_chain);
+ spin_unlock(&fld->lcf_lock);
+ if (target != origin)
+ goto again;
+ }
+ if (rc == 0) {
+ *mds = res.lsr_index;
+ fld_cache_insert(fld->lcf_cache, &res);
+ }
+
+ RETURN(rc);
}
-EXPORT_SYMBOL(fld_client_delete);
+EXPORT_SYMBOL(fld_client_lookup);
-int fld_client_lookup(struct lu_client_fld *fld,
- seqno_t seq, mdsno_t *mds,
- const struct lu_env *env)
+void fld_client_flush(struct lu_client_fld *fld)
{
- struct md_fld md_fld = { .mf_seq = seq, .mf_mds = 0 };
- struct lu_fld_target *target;
- int rc;
- ENTRY;
+ fld_cache_flush(fld->lcf_cache);
+}
- fld->lcf_flags |= LUSTRE_FLD_RUN;
- rc = fld_cache_lookup(fld->lcf_cache, seq, mds);
- if (rc == 0)
- RETURN(0);
+struct proc_dir_entry *fld_type_proc_dir;
- /* Can not find it in the cache */
- target = fld_client_get_target(fld, seq);
- LASSERT(target != NULL);
+static int __init fld_init(void)
+{
+ fld_type_proc_dir = lprocfs_register(LUSTRE_FLD_NAME,
+ proc_lustre_root,
+ NULL, NULL);
+ if (IS_ERR(fld_type_proc_dir))
+ return PTR_ERR(fld_type_proc_dir);
- CDEBUG(D_INFO, "%s: Lookup fld entry (seq: "LPX64") on "
- "target %s (idx "LPU64")\n", fld->lcf_name, seq,
- fld_target_name(target), target->ft_idx);
+#ifdef HAVE_SERVER_SUPPORT
+ fld_server_mod_init();
+#endif /* HAVE_SERVER_SUPPORT */
-#ifdef __KERNEL__
- if (target->ft_srv != NULL) {
- LASSERT(env != NULL);
- rc = fld_server_lookup(target->ft_srv,
- env, seq, &md_fld.mf_mds);
- } else {
-#endif
- /*
- * insert the 'inflight' sequence. No need to protect that,
- * we are trying to reduce numbers of RPC but not restrict
- * to them exactly one
- */
- fld_cache_insert_inflight(fld->lcf_cache, seq);
- rc = fld_client_rpc(target->ft_exp,
- &md_fld, FLD_LOOKUP);
-#ifdef __KERNEL__
- }
-#endif
- if (rc == 0) {
- *mds = md_fld.mf_mds;
-
- /*
- * Do not return error here as well. See previous comment in
- * same situation in function fld_client_create().
- */
- fld_cache_insert(fld->lcf_cache, seq, *mds);
- } else {
- /* remove 'inflight' seq if it exists */
- fld_cache_delete(fld->lcf_cache, seq);
- }
- RETURN(rc);
+ return 0;
}
-EXPORT_SYMBOL(fld_client_lookup);
-void fld_client_flush(struct lu_client_fld *fld)
+static void __exit fld_exit(void)
{
-#ifdef __KERNEL__
- fld_cache_flush(fld->lcf_cache);
-#endif
+#ifdef HAVE_SERVER_SUPPORT
+ fld_server_mod_exit();
+#endif /* HAVE_SERVER_SUPPORT */
+
+ if (fld_type_proc_dir != NULL && !IS_ERR(fld_type_proc_dir)) {
+ lprocfs_remove(&fld_type_proc_dir);
+ fld_type_proc_dir = NULL;
+ }
}
-EXPORT_SYMBOL(fld_client_flush);
+MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
+MODULE_DESCRIPTION("Lustre FID Location Database");
+MODULE_VERSION(LUSTRE_VERSION_STRING);
+MODULE_LICENSE("GPL");
+
+module_init(fld_init);
+module_exit(fld_exit);
git://git.whamcloud.com / fs / lustre-release.git / blobdiff