* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
- * Copyright (c) 2011, Whamcloud, Inc.
+ * Copyright (c) 2011, 2015, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* 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)
-{
- int rc;
- ENTRY;
- client_obd_list_lock(&cli->cl_loi_list_lock);
- rc = cfs_list_empty(&mcw->mcw_entry);
- client_obd_list_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 };
-
- client_obd_list_lock(&cli->cl_loi_list_lock);
- if (cli->cl_r_in_flight >= cli->cl_max_rpcs_in_flight) {
- cfs_list_add_tail(&mcw.mcw_entry, &cli->cl_cache_waiters);
- cfs_waitq_init(&mcw.mcw_waitq);
- client_obd_list_unlock(&cli->cl_loi_list_lock);
- l_wait_event(mcw.mcw_waitq, fld_req_avail(cli, &mcw), &lwi);
- } else {
- cli->cl_r_in_flight++;
- client_obd_list_unlock(&cli->cl_loi_list_lock);
- }
-}
-
-static void fld_exit_request(struct client_obd *cli)
-{
- cfs_list_t *l, *tmp;
- struct mdc_cache_waiter *mcw;
-
- client_obd_list_lock(&cli->cl_loi_list_lock);
- cli->cl_r_in_flight--;
- cfs_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 = cfs_list_entry(l, struct mdc_cache_waiter, mcw_entry);
- cfs_list_del_init(&mcw->mcw_entry);
- cli->cl_r_in_flight++;
- cfs_waitq_signal(&mcw->mcw_waitq);
- }
- client_obd_list_unlock(&cli->cl_loi_list_lock);
-}
-
-static int fld_rrb_hash(struct lu_client_fld *fld,
- seqno_t seq)
+static int fld_rrb_hash(struct lu_client_fld *fld, u64 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);
-
- cfs_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);
- cfs_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 ?
.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);
- cfs_spin_lock(&fld->lcf_lock);
- target = fld->lcf_hash->fh_scan_func(fld, seq);
- cfs_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);
- cfs_spin_lock(&fld->lcf_lock);
- cfs_list_for_each_entry(tmp, &fld->lcf_targets, ft_chain) {
- if (tmp->ft_idx == tar->ft_idx) {
- cfs_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;
- cfs_list_add_tail(&target->ft_chain,
- &fld->lcf_targets);
+ list_add_tail(&target->ft_chain, &fld->lcf_targets);
fld->lcf_count++;
- cfs_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;
- cfs_spin_lock(&fld->lcf_lock);
- cfs_list_for_each_entry_safe(target, tmp,
- &fld->lcf_targets, ft_chain) {
- if (target->ft_idx == idx) {
- fld->lcf_count--;
- cfs_list_del(&target->ft_chain);
- cfs_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);
}
}
- cfs_spin_unlock(&fld->lcf_lock);
- RETURN(-ENOENT);
+ spin_unlock(&fld->lcf_lock);
+ RETURN(-ENOENT);
}
-EXPORT_SYMBOL(fld_client_del_target);
-#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;
}
void fld_client_proc_fini(struct lu_client_fld *fld)
}
EXIT;
}
-#else
+#else /* !CONFIG_PROC_FS */
static int fld_client_proc_init(struct lu_client_fld *fld)
{
return 0;
{
return;
}
-#endif
+#endif /* CONFIG_PROC_FS */
EXPORT_SYMBOL(fld_client_proc_fini);
RETURN(-EINVAL);
}
- fld->lcf_count = 0;
- cfs_spin_lock_init(&fld->lcf_lock);
- fld->lcf_hash = &fld_hash[hash];
- fld->lcf_flags = LUSTRE_FLD_INIT;
- CFS_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);
cache_size = FLD_CLIENT_CACHE_SIZE /
sizeof(struct fld_cache_entry);
void fld_client_fini(struct lu_client_fld *fld)
{
- struct lu_fld_target *target, *tmp;
- ENTRY;
+ struct lu_fld_target *target, *tmp;
+ ENTRY;
- cfs_spin_lock(&fld->lcf_lock);
- cfs_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--;
- cfs_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);
}
- cfs_spin_unlock(&fld->lcf_lock);
+ spin_unlock(&fld->lcf_lock);
if (fld->lcf_cache != NULL) {
if (!IS_ERR(fld->lcf_cache))
EXPORT_SYMBOL(fld_client_fini);
int fld_client_rpc(struct obd_export *exp,
- struct lu_seq_range *range, __u32 fld_op)
+ struct lu_seq_range *range, __u32 fld_op,
+ struct ptlrpc_request **reqp)
{
- struct ptlrpc_request *req;
- struct lu_seq_range *prange;
- __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;
-
- prange = req_capsule_client_get(&req->rq_pill, &RMF_FLD_MDFLD);
- *prange = *range;
-
- 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;
+ req->rq_reply_portal = MDC_REPLY_PORTAL;
ptlrpc_at_set_req_timeout(req);
- 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);
-
- prange = req_capsule_server_get(&req->rq_pill, &RMF_FLD_MDFLD);
- if (prange == NULL)
- GOTO(out_req, rc = -EFAULT);
- *range = *prange;
- EXIT;
+ 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_lookup(struct lu_client_fld *fld, seqno_t seq, mdsno_t *mds,
- __u32 flags, const struct lu_env *env)
-{
- struct lu_seq_range res;
- struct lu_fld_target *target;
- int rc;
- ENTRY;
+ if (reqp != NULL)
+ *reqp = req;
- fld->lcf_flags |= LUSTRE_FLD_RUN;
+ return rc;
+}
- rc = fld_cache_lookup(fld->lcf_cache, seq, &res);
- if (rc == 0) {
- *mds = res.lsr_index;
- RETURN(0);
- }
+int fld_client_lookup(struct lu_client_fld *fld, u64 seq, u32 *mds,
+ __u32 flags, const struct lu_env *env)
+{
+ 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);
-
+ 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);
- res.lsr_start = seq;
- res.lsr_flags = flags;
-#ifdef __KERNEL__
- if (target->ft_srv != NULL) {
- LASSERT(env != NULL);
- rc = fld_server_lookup(target->ft_srv,
- env, seq, &res);
- } else {
-#endif
- rc = fld_client_rpc(target->ft_exp,
- &res, FLD_LOOKUP);
-#ifdef __KERNEL__
- }
-#endif
-
- if (rc == 0) {
- *mds = res.lsr_index;
-
- fld_cache_insert(fld->lcf_cache, &res);
- }
- 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_lookup);
{
fld_cache_flush(fld->lcf_cache);
}
-EXPORT_SYMBOL(fld_client_flush);
+
+
+struct proc_dir_entry *fld_type_proc_dir;
+
+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);
+
+#ifdef HAVE_SERVER_SUPPORT
+ fld_server_mod_init();
+#endif /* HAVE_SERVER_SUPPORT */
+
+ return 0;
+}
+
+static void __exit fld_exit(void)
+{
+#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;
+ }
+}
+
+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