Viewing: fld_handler.c
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2011, 2015, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
*
* 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/module.h>
#include <obd.h>
#include <obd_support.h>
#include <lu_target.h>
#include <lustre_fid.h>
#include <lustre_fld.h>
#include <lustre_req_layout.h>
#include <lprocfs_status.h>
#include "fld_internal.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 */
/* MGS thread may create llog file causing FLD lookup */
LU_CONTEXT_KEY_DEFINE(fld, LCT_MD_THREAD | LCT_DT_THREAD | LCT_MG_THREAD);
int fld_server_mod_init(void)
{
LU_CONTEXT_KEY_INIT(&fld_thread_key);
return lu_context_key_register(&fld_thread_key);
}
void fld_server_mod_exit(void)
{
lu_context_key_degister(&fld_thread_key);
}
int fld_declare_server_create(const struct lu_env *env,
struct lu_server_fld *fld,
const 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);
/**
* fld_server_create() - Insert FLD index entry and update FLD cache.
* @env: current lustre environment
* @fld: server-side pointer to FLD
* @range: actual data to insert
* @th: transaction handle
*
* This function is called from the sequence allocator when a super-sequence
* is granted to a server.
*
* Return:
* * %0 on success
* * %negative on error
*/
int fld_server_create(const struct lu_env *env, struct lu_server_fld *fld,
const 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);
/*
* Extract index information from fld name like srv-fsname-MDT0000
*/
int fld_name_to_index(const char *name, u32 *index)
{
char *dash;
int rc;
ENTRY;
CDEBUG(D_INFO, "get index from %s\n", name);
dash = strrchr(name, '-');
if (!dash)
RETURN(-EINVAL);
dash++;
rc = target_name2index(dash, index, NULL);
RETURN(rc);
}
/*
* Retrieve fldb entry from MDT0 and add to local FLDB and cache.
*/
int fld_update_from_controller(const struct lu_env *env,
struct lu_server_fld *fld)
{
struct fld_thread_info *info;
struct lu_seq_range *range;
struct lu_seq_range_array *lsra;
u32 index = 0;
struct ptlrpc_request *req = NULL;
int rc;
int i;
ENTRY;
/*
* Update only happens during initalization, i.e. local FLDB
* does not exist yet
*/
if (!fld->lsf_new)
RETURN(0);
rc = fld_name_to_index(fld->lsf_name, &index);
if (rc < 0)
RETURN(rc);
/* No need update fldb for MDT0 */
if (index == 0)
RETURN(0);
info = lu_context_key_get(&env->le_ctx, &fld_thread_key);
LASSERT(info != NULL);
range = &info->fti_lrange;
memset(range, 0, sizeof(*range));
range->lsr_index = index;
fld_range_set_mdt(range);
do {
rc = fld_client_rpc(fld->lsf_control_exp, range, FLD_READ,
&req);
if (rc != 0)
GOTO(out, rc);
LASSERT(req != NULL);
lsra = (struct lu_seq_range_array *)req_capsule_server_get(
&req->rq_pill, &RMF_GENERIC_DATA);
if (!lsra)
GOTO(out, rc = -EPROTO);
range_array_le_to_cpu(lsra, lsra);
for (i = 0; i < lsra->lsra_count; i++) {
int rc1;
if (lsra->lsra_lsr[i].lsr_flags != LU_SEQ_RANGE_MDT)
GOTO(out, rc = -EINVAL);
if (lsra->lsra_lsr[i].lsr_index != index)
GOTO(out, rc = -EINVAL);
mutex_lock(&fld->lsf_lock);
rc1 = fld_insert_entry(env, fld, &lsra->lsra_lsr[i]);
mutex_unlock(&fld->lsf_lock);
if (rc1 != 0)
GOTO(out, rc = rc1);
}
if (rc == -EAGAIN)
*range = lsra->lsra_lsr[lsra->lsra_count - 1];
} while (rc == -EAGAIN);
fld->lsf_new = 1;
out:
if (req)
ptlrpc_req_put(req);
RETURN(rc);
}
EXPORT_SYMBOL(fld_update_from_controller);
/**
* fld_local_lookup() - Lookup sequece in (server) local cache/fldb.
* @env: current lustre environment
* @fld: server-side pointer to FLD
* @seq: sequence to search
* @range: actual range we get after lookup [out]
*
* Return:
* * %0 on success
* * %negative on error
*/
int fld_local_lookup(const struct lu_env *env, struct lu_server_fld *fld,
u64 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);
}
RETURN(rc);
}
EXPORT_SYMBOL(fld_local_lookup);
/**
* fld_server_lookup() - Lookup MDT/OST by seq, returns a range for given seq.
* @env: current lustre environment
* @fld: server-side pointer to FLD
* @seq: sequence to search
* @range: actual range we get after lookup [out]
*
* 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.
*
* Return:
* * %0 on success
* * %negative on error
*/
int fld_server_lookup(const struct lu_env *env, struct lu_server_fld *fld,
u64 seq, struct lu_seq_range *range)
{
u32 index;
int rc;
ENTRY;
rc = fld_local_lookup(env, fld, seq, range);
if (likely(rc == 0))
RETURN(rc);
rc = fld_name_to_index(fld->lsf_name, &index);
if (rc < 0)
RETURN(rc);
if (index == 0 && rc == LDD_F_SV_TYPE_MDT) {
/*
* 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 %#llx: rc = %d\n",
fld->lsf_name, seq, -ENOENT);
RETURN(-ENOENT);
} else {
int i;
if (!fld->lsf_control_exp) {
CERROR("%s: lookup %#llx, but not connects to MDT0 yet: rc = %d.\n",
fld->lsf_name, seq, -EIO);
RETURN(-EIO);
}
/*
* 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;
for (i = 0; i < 5; i++) {
rc = fld_client_rpc(fld->lsf_control_exp,
range, FLD_QUERY, NULL);
if (rc != -EAGAIN)
break;
schedule_timeout_interruptible(cfs_time_seconds(1));
}
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_handle_lookup(struct tgt_session_info *tsi)
{
struct obd_export *exp = tsi->tsi_exp;
struct lu_site *site = exp->exp_obd->obd_lu_dev->ld_site;
struct lu_server_fld *fld;
struct lu_seq_range *in;
struct lu_seq_range *out;
int rc;
ENTRY;
in = req_capsule_client_get(tsi->tsi_pill, &RMF_FLD_MDFLD);
if (!in)
RETURN(err_serious(-EPROTO));
rc = req_capsule_server_pack(tsi->tsi_pill);
if (unlikely(rc != 0))
RETURN(err_serious(rc));
out = req_capsule_server_get(tsi->tsi_pill, &RMF_FLD_MDFLD);
if (!out)
RETURN(err_serious(-EPROTO));
*out = *in;
fld = lu_site2seq(site)->ss_server_fld;
rc = fld_server_lookup(tsi->tsi_env, fld, in->lsr_start, out);
CDEBUG(D_INFO, "%s: FLD req handle: error %d (range: "DRANGE")\n",
fld->lsf_name, rc, PRANGE(out));
RETURN(rc);
}
static int fld_handle_read(struct tgt_session_info *tsi)
{
struct obd_export *exp = tsi->tsi_exp;
struct lu_site *site = exp->exp_obd->obd_lu_dev->ld_site;
struct lu_seq_range *in;
void *data;
int rc;
ENTRY;
req_capsule_set(tsi->tsi_pill, &RQF_FLD_READ);
in = req_capsule_client_get(tsi->tsi_pill, &RMF_FLD_MDFLD);
if (!in)
RETURN(err_serious(-EPROTO));
req_capsule_set_size(tsi->tsi_pill, &RMF_GENERIC_DATA, RCL_SERVER,
PAGE_SIZE);
rc = req_capsule_server_pack(tsi->tsi_pill);
if (unlikely(rc != 0))
RETURN(err_serious(rc));
data = req_capsule_server_get(tsi->tsi_pill, &RMF_GENERIC_DATA);
rc = fld_server_read(tsi->tsi_env, lu_site2seq(site)->ss_server_fld,
in, data, PAGE_SIZE);
RETURN(rc);
}
static int fld_handle_query(struct tgt_session_info *tsi)
{
int rc;
ENTRY;
req_capsule_set(tsi->tsi_pill, &RQF_FLD_QUERY);
rc = fld_handle_lookup(tsi);
RETURN(rc);
}
/**
* fid_is_local() - Report if the fid is local to this server node
* @env: current lustre environment
* @site: struct lu_site (local server)
* @fid: FID which is being checked
*
* 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.
*
* Returns %True, if fid is local to this server node.
*/
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) {
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_debugfs_fini(struct lu_server_fld *fld)
{
debugfs_remove_recursive(fld->lsf_debugfs_entry);
}
static void fld_server_debugfs_init(struct lu_server_fld *fld)
{
ENTRY;
fld->lsf_debugfs_entry = debugfs_create_dir(fld->lsf_name,
fld_debugfs_dir);
debugfs_create_file("fldb", 0444, fld->lsf_debugfs_entry, fld,
&fld_debugfs_seq_fops);
}
int fld_server_init(const struct lu_env *env, struct lu_server_fld *fld,
struct dt_device *dt, const char *prefix, 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;
RETURN(rc);
}
rc = fld_index_init(env, fld, dt, type);
if (rc)
GOTO(out_cache, rc);
fld_server_debugfs_init(fld);
fld->lsf_control_exp = NULL;
fld->lsf_seq_lookup = fld_server_lookup;
fld->lsf_seq_lookup = fld_server_lookup;
RETURN(0);
out_cache:
fld_cache_fini(fld->lsf_cache);
return rc;
}
EXPORT_SYMBOL(fld_server_init);
void fld_server_fini(const struct lu_env *env, struct lu_server_fld *fld)
{
ENTRY;
fld_server_debugfs_fini(fld);
fld_index_fini(env, fld);
if (fld->lsf_cache) {
if (!IS_ERR(fld->lsf_cache))
fld_cache_fini(fld->lsf_cache);
fld->lsf_cache = NULL;
}
EXIT;
}
EXPORT_SYMBOL(fld_server_fini);
struct tgt_handler fld_handlers[] = {
TGT_FLD_HDL_VAR(0, FLD_QUERY, fld_handle_query),
TGT_FLD_HDL_VAR(0, FLD_READ, fld_handle_read),
};
EXPORT_SYMBOL(fld_handlers);
