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* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 only,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is included
* in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; If not, see
* http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
* GPL HEADER END
*/
/*
* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2011, 2013, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*
* lustre/fld/fld_handler.c
*
* FLD (Fids Location Database)
*
* Author: Yury Umanets <umka@clusterfs.com>
* Author: WangDi <wangdi@clusterfs.com>
* Author: Pravin Shelar <pravin.shelar@sun.com>
*/
#define DEBUG_SUBSYSTEM S_FLD
# include <linux/libcfs/libcfs.h>
# include <linux/module.h>
# include <linux/jbd.h>
# include <asm/div64.h>
#include <obd.h>
#include <obd_class.h>
#include <lustre_ver.h>
#include <obd_support.h>
#include <lprocfs_status.h>
#include <md_object.h>
#include <lustre_fid.h>
#include <lustre_req_layout.h>
#include "fld_internal.h"
#include <lustre_fid.h>
/* context key constructor/destructor: fld_key_init, fld_key_fini */
LU_KEY_INIT_FINI(fld, struct fld_thread_info);
/* context key: fld_thread_key */
LU_CONTEXT_KEY_DEFINE(fld, LCT_MD_THREAD | LCT_DT_THREAD | LCT_MG_THREAD);
proc_dir_entry_t *fld_type_proc_dir = NULL;
static int __init fld_mod_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);
LU_CONTEXT_KEY_INIT(&fld_thread_key);
lu_context_key_register(&fld_thread_key);
return 0;
}
static void __exit fld_mod_exit(void)
{
lu_context_key_degister(&fld_thread_key);
if (fld_type_proc_dir != NULL && !IS_ERR(fld_type_proc_dir)) {
lprocfs_remove(&fld_type_proc_dir);
fld_type_proc_dir = NULL;
}
}
int fld_declare_server_create(const struct lu_env *env,
struct lu_server_fld *fld,
struct lu_seq_range *range,
struct thandle *th)
{
int rc;
rc = fld_declare_index_create(env, fld, range, th);
RETURN(rc);
}
EXPORT_SYMBOL(fld_declare_server_create);
/**
* Insert FLD index entry and update FLD cache.
*
* This function is called from the sequence allocator when a super-sequence
* is granted to a server.
*/
int fld_server_create(const struct lu_env *env, struct lu_server_fld *fld,
struct lu_seq_range *range, struct thandle *th)
{
int rc;
mutex_lock(&fld->lsf_lock);
rc = fld_index_create(env, fld, range, th);
mutex_unlock(&fld->lsf_lock);
RETURN(rc);
}
EXPORT_SYMBOL(fld_server_create);
/**
* Lookup mds by seq, returns a range for given seq.
*
* If that entry is not cached in fld cache, request is sent to super
* sequence controller node (MDT0). All other MDT[1...N] and client
* cache fld entries, but this cache is not persistent.
*/
int fld_server_lookup(const struct lu_env *env, struct lu_server_fld *fld,
seqno_t seq, struct lu_seq_range *range)
{
struct lu_seq_range *erange;
struct fld_thread_info *info;
int rc;
ENTRY;
info = lu_context_key_get(&env->le_ctx, &fld_thread_key);
LASSERT(info != NULL);
erange = &info->fti_lrange;
/* Lookup it in the cache. */
rc = fld_cache_lookup(fld->lsf_cache, seq, erange);
if (rc == 0) {
if (unlikely(fld_range_type(erange) != fld_range_type(range) &&
!fld_range_is_any(range))) {
CERROR("%s: FLD cache range "DRANGE" does not match"
"requested flag %x: rc = %d\n", fld->lsf_name,
PRANGE(erange), range->lsr_flags, -EIO);
RETURN(-EIO);
}
*range = *erange;
RETURN(0);
}
if (fld->lsf_obj) {
/* On server side, all entries should be in cache.
* If we can not find it in cache, just return error */
CERROR("%s: Cannot find sequence "LPX64": rc = %d\n",
fld->lsf_name, seq, -EIO);
RETURN(-EIO);
} else {
LASSERT(fld->lsf_control_exp);
/* send request to mdt0 i.e. super seq. controller.
* This is temporary solution, long term solution is fld
* replication on all mdt servers.
*/
range->lsr_start = seq;
rc = fld_client_rpc(fld->lsf_control_exp,
range, FLD_LOOKUP);
if (rc == 0)
fld_cache_insert(fld->lsf_cache, range);
}
RETURN(rc);
}
EXPORT_SYMBOL(fld_server_lookup);
/**
* All MDT server handle fld lookup operation. But only MDT0 has fld index.
* if entry is not found in cache we need to forward lookup request to MDT0
*/
static int fld_server_handle(struct lu_server_fld *fld,
const struct lu_env *env,
__u32 opc, struct lu_seq_range *range,
struct fld_thread_info *info)
{
int rc;
ENTRY;
switch (opc) {
case FLD_LOOKUP:
rc = fld_server_lookup(env, fld, range->lsr_start, range);
break;
default:
rc = -EINVAL;
break;
}
CDEBUG(D_INFO, "%s: FLD req handle: error %d (opc: %d, range: "
DRANGE"\n", fld->lsf_name, rc, opc, PRANGE(range));
RETURN(rc);
}
static int fld_req_handle(struct ptlrpc_request *req,
struct fld_thread_info *info)
{
struct obd_export *exp = req->rq_export;
struct lu_site *site = exp->exp_obd->obd_lu_dev->ld_site;
struct lu_seq_range *in;
struct lu_seq_range *out;
int rc;
__u32 *opc;
ENTRY;
rc = req_capsule_server_pack(info->fti_pill);
if (rc)
RETURN(err_serious(rc));
opc = req_capsule_client_get(info->fti_pill, &RMF_FLD_OPC);
if (opc != NULL) {
in = req_capsule_client_get(info->fti_pill, &RMF_FLD_MDFLD);
if (in == NULL)
RETURN(err_serious(-EPROTO));
out = req_capsule_server_get(info->fti_pill, &RMF_FLD_MDFLD);
if (out == NULL)
RETURN(err_serious(-EPROTO));
*out = *in;
/* For old 2.0 client, the 'lsr_flags' is uninitialized.
* Set it as 'LU_SEQ_RANGE_MDT' by default. */
if (!(exp_connect_flags(exp) & OBD_CONNECT_64BITHASH) &&
!(exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) &&
!(exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT) &&
!exp->exp_libclient)
fld_range_set_mdt(out);
rc = fld_server_handle(lu_site2seq(site)->ss_server_fld,
req->rq_svc_thread->t_env,
*opc, out, info);
} else {
rc = err_serious(-EPROTO);
}
RETURN(rc);
}
static void fld_thread_info_init(struct ptlrpc_request *req,
struct fld_thread_info *info)
{
info->fti_pill = &req->rq_pill;
/* Init request capsule. */
req_capsule_init(info->fti_pill, req, RCL_SERVER);
req_capsule_set(info->fti_pill, &RQF_FLD_QUERY);
}
static void fld_thread_info_fini(struct fld_thread_info *info)
{
req_capsule_fini(info->fti_pill);
}
static int fld_handle(struct ptlrpc_request *req)
{
struct fld_thread_info *info;
const struct lu_env *env;
int rc;
env = req->rq_svc_thread->t_env;
LASSERT(env != NULL);
info = lu_context_key_get(&env->le_ctx, &fld_thread_key);
LASSERT(info != NULL);
fld_thread_info_init(req, info);
rc = fld_req_handle(req, info);
fld_thread_info_fini(info);
return rc;
}
/*
* Entry point for handling FLD RPCs called from MDT.
*/
int fld_query(struct com_thread_info *info)
{
return fld_handle(info->cti_pill->rc_req);
}
EXPORT_SYMBOL(fld_query);
/*
* Returns true, if fid is local to this server node.
*
* WARNING: this function is *not* guaranteed to return false if fid is
* remote: it makes an educated conservative guess only.
*
* fid_is_local() is supposed to be used in assertion checks only.
*/
int fid_is_local(const struct lu_env *env,
struct lu_site *site, const struct lu_fid *fid)
{
int result;
struct seq_server_site *ss_site;
struct lu_seq_range *range;
struct fld_thread_info *info;
ENTRY;
info = lu_context_key_get(&env->le_ctx, &fld_thread_key);
range = &info->fti_lrange;
result = 1; /* conservatively assume fid is local */
ss_site = lu_site2seq(site);
if (ss_site->ss_client_fld != NULL) {
int rc;
rc = fld_cache_lookup(ss_site->ss_client_fld->lcf_cache,
fid_seq(fid), range);
if (rc == 0)
result = (range->lsr_index == ss_site->ss_node_id);
}
return result;
}
EXPORT_SYMBOL(fid_is_local);
static void fld_server_proc_fini(struct lu_server_fld *fld);
#ifdef LPROCFS
static int fld_server_proc_init(struct lu_server_fld *fld)
{
int rc = 0;
ENTRY;
fld->lsf_proc_dir = lprocfs_register(fld->lsf_name,
fld_type_proc_dir,
fld_server_proc_list, fld);
if (IS_ERR(fld->lsf_proc_dir)) {
rc = PTR_ERR(fld->lsf_proc_dir);
RETURN(rc);
}
rc = lprocfs_seq_create(fld->lsf_proc_dir, "fldb", 0444,
&fld_proc_seq_fops, fld);
if (rc) {
lprocfs_remove(&fld->lsf_proc_dir);
fld->lsf_proc_dir = NULL;
}
RETURN(rc);
}
static void fld_server_proc_fini(struct lu_server_fld *fld)
{
ENTRY;
if (fld->lsf_proc_dir != NULL) {
if (!IS_ERR(fld->lsf_proc_dir))
lprocfs_remove(&fld->lsf_proc_dir);
fld->lsf_proc_dir = NULL;
}
EXIT;
}
#else
static int fld_server_proc_init(struct lu_server_fld *fld)
{
return 0;
}
static void fld_server_proc_fini(struct lu_server_fld *fld)
{
return;
}
#endif
int fld_server_init(const struct lu_env *env, struct lu_server_fld *fld,
struct dt_device *dt, const char *prefix, int mds_node_id,
int type)
{
int cache_size, cache_threshold;
int rc;
ENTRY;
snprintf(fld->lsf_name, sizeof(fld->lsf_name),
"srv-%s", prefix);
cache_size = FLD_SERVER_CACHE_SIZE /
sizeof(struct fld_cache_entry);
cache_threshold = cache_size *
FLD_SERVER_CACHE_THRESHOLD / 100;
mutex_init(&fld->lsf_lock);
fld->lsf_cache = fld_cache_init(fld->lsf_name,
cache_size, cache_threshold);
if (IS_ERR(fld->lsf_cache)) {
rc = PTR_ERR(fld->lsf_cache);
fld->lsf_cache = NULL;
GOTO(out, rc);
}
if (!mds_node_id && type == LU_SEQ_RANGE_MDT) {
rc = fld_index_init(env, fld, dt);
if (rc)
GOTO(out, rc);
} else {
fld->lsf_obj = NULL;
}
rc = fld_server_proc_init(fld);
if (rc)
GOTO(out, rc);
fld->lsf_control_exp = NULL;
GOTO(out, rc);
out:
if (rc)
fld_server_fini(env, fld);
return rc;
}
EXPORT_SYMBOL(fld_server_init);
void fld_server_fini(const struct lu_env *env, struct lu_server_fld *fld)
{
ENTRY;
fld_server_proc_fini(fld);
fld_index_fini(env, fld);
if (fld->lsf_cache != NULL) {
if (!IS_ERR(fld->lsf_cache))
fld_cache_fini(fld->lsf_cache);
fld->lsf_cache = NULL;
}
EXIT;
}
EXPORT_SYMBOL(fld_server_fini);
MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
MODULE_DESCRIPTION("Lustre FLD");
MODULE_LICENSE("GPL");
cfs_module(mdd, "0.1.0", fld_mod_init, fld_mod_exit);
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