X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=blobdiff_plain;f=lustre%2Ffld%2Ffld_index.c;h=f8bbfbaaf77d776338e909958061f9654999b1fa;hp=df552f601fdd4644d026632e20e71230c6d91a13;hb=79d06b6fac3d18f2e5755a940e8afa42e70f3ba2;hpb=70e80ade90af09300396706b8910e196a7928520

diff --git a/lustre/fld/fld_index.c b/lustre/fld/fld_index.c
index df552f6..f8bbfba 100644
--- a/lustre/fld/fld_index.c
+++ b/lustre/fld/fld_index.c
@@ -1,6 +1,4 @@
-/* -*- 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.
@@ -16,8 +14,8 @@
  * 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 [sun.com URL with a
- * copy of GPLv2].
+ * 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
@@ -26,8 +24,10 @@
  * GPL HEADER END
  */
 /*
- * Copyright  2008 Sun Microsystems, Inc. All rights reserved
+ * 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/
@@ -38,9 +38,7 @@
  * Author: WangDi <wangdi@clusterfs.com>
  * Author: Yury Umanets <umka@clusterfs.com>
  */
-#ifndef EXPORT_SYMTAB
-# define EXPORT_SYMTAB
-#endif
+
 #define DEBUG_SUBSYSTEM S_FLD
 
 #ifdef __KERNEL__
@@ -60,160 +58,361 @@
 #include <dt_object.h>
 #include <md_object.h>
 #include <lustre_mdc.h>
+#include <lustre_fid.h>
 #include <lustre_fld.h>
 #include "fld_internal.h"
 
 const char fld_index_name[] = "fld";
 
-static const struct dt_index_features fld_index_features = {
-        .dif_flags       = DT_IND_UPDATE,
-        .dif_keysize_min = sizeof(seqno_t),
-        .dif_keysize_max = sizeof(seqno_t),
-        .dif_recsize_min = sizeof(mdsno_t),
-        .dif_recsize_max = sizeof(mdsno_t)
+static const struct lu_seq_range IGIF_FLD_RANGE = {
+	.lsr_start = FID_SEQ_IGIF,
+	.lsr_end   = FID_SEQ_IGIF_MAX + 1,
+	.lsr_index = 0,
+	.lsr_flags = LU_SEQ_RANGE_MDT
 };
 
-/*
- * number of blocks to reserve for particular operations. Should be function of
- * ... something. Stub for now.
- */
-enum {
-        FLD_TXN_INDEX_INSERT_CREDITS  = 20,
-        FLD_TXN_INDEX_DELETE_CREDITS  = 20,
+static const struct lu_seq_range ROOT_FLD_RANGE = {
+	.lsr_start = FID_SEQ_ROOT,
+	.lsr_end   = FID_SEQ_ROOT + 1,
+	.lsr_index = 0,
+	.lsr_flags = LU_SEQ_RANGE_MDT
+};
+
+const struct dt_index_features fld_index_features = {
+	.dif_flags       = DT_IND_UPDATE,
+	.dif_keysize_min = sizeof(seqno_t),
+	.dif_keysize_max = sizeof(seqno_t),
+	.dif_recsize_min = sizeof(struct lu_seq_range),
+	.dif_recsize_max = sizeof(struct lu_seq_range),
+	.dif_ptrsize     = 4
 };
 
 extern struct lu_context_key fld_thread_key;
 
-static struct dt_key *fld_key(const struct lu_env *env,
-                              const seqno_t seq)
+int fld_declare_index_create(const struct lu_env *env,
+			     struct lu_server_fld *fld,
+			     const struct lu_seq_range *new_range,
+			     struct thandle *th)
 {
-        struct fld_thread_info *info;
-        ENTRY;
+	struct lu_seq_range	*tmp;
+	struct lu_seq_range	*range;
+	struct fld_thread_info	*info;
+	int			rc = 0;
+
+	ENTRY;
+
+	info = lu_context_key_get(&env->le_ctx, &fld_thread_key);
+	range = &info->fti_lrange;
+	tmp = &info->fti_irange;
+	memset(range, 0, sizeof(*range));
 
-        info = lu_context_key_get(&env->le_ctx, &fld_thread_key);
-        LASSERT(info != NULL);
+	rc = fld_index_lookup(env, fld, new_range->lsr_start, range);
+	if (rc == 0) {
+		/* In case of duplicate entry, the location must be same */
+		LASSERT((range_compare_loc(new_range, range) == 0));
+		GOTO(out, rc = -EEXIST);
+	}
 
-        info->fti_key = cpu_to_be64(seq);
-        RETURN((void *)&info->fti_key);
+	if (rc != -ENOENT) {
+		CERROR("%s: lookup range "DRANGE" error: rc = %d\n",
+			fld->lsf_name, PRANGE(range), rc);
+		GOTO(out, rc);
+	}
+
+	/* Check for merge case, since the fld entry can only be increamental,
+	 * so we will only check whether it can be merged from the left. */
+	if (new_range->lsr_start == range->lsr_end && range->lsr_end != 0 &&
+	    range_compare_loc(new_range, range) == 0) {
+		range_cpu_to_be(tmp, range);
+		rc = dt_declare_delete(env, fld->lsf_obj,
+				       (struct dt_key *)&tmp->lsr_start, th);
+		if (rc) {
+			CERROR("%s: declare record "DRANGE" failed: rc = %d\n",
+			       fld->lsf_name, PRANGE(range), rc);
+			GOTO(out, rc);
+		}
+		memcpy(tmp, new_range, sizeof(*new_range));
+		tmp->lsr_start = range->lsr_start;
+	} else {
+		memcpy(tmp, new_range, sizeof(*new_range));
+	}
+
+	range_cpu_to_be(tmp, tmp);
+	rc = dt_declare_insert(env, fld->lsf_obj, (struct dt_rec *)tmp,
+			       (struct dt_key *)&tmp->lsr_start, th);
+out:
+	RETURN(rc);
 }
 
-static struct dt_rec *fld_rec(const struct lu_env *env,
-                              const mdsno_t mds)
+/**
+ * insert range in fld store.
+ *
+ *      \param  range  range to be inserted
+ *      \param  th     transaction for this operation as it could compound
+ *                     transaction.
+ *
+ *      \retval  0  success
+ *      \retval  -ve error
+ *
+ * The whole fld index insertion is protected by seq->lss_mutex (see
+ * seq_server_alloc_super), i.e. only one thread will access fldb each
+ * time, so we do not need worry the fld file and cache will being
+ * changed between declare and create.
+ * Because the fld entry can only be increamental, so we will only check
+ * whether it can be merged from the left.
+ **/
+int fld_index_create(const struct lu_env *env, struct lu_server_fld *fld,
+		     const struct lu_seq_range *new_range, struct thandle *th)
 {
-        struct fld_thread_info *info;
-        ENTRY;
+	struct lu_seq_range	*range;
+	struct lu_seq_range	*tmp;
+	struct fld_thread_info	*info;
+	int			rc = 0;
+	int			deleted = 0;
+	struct fld_cache_entry	*flde;
+	ENTRY;
+
+	info = lu_context_key_get(&env->le_ctx, &fld_thread_key);
+
+	LASSERT_MUTEX_LOCKED(&fld->lsf_lock);
+
+	range = &info->fti_lrange;
+	memset(range, 0, sizeof(*range));
+	tmp = &info->fti_irange;
+	rc = fld_index_lookup(env, fld, new_range->lsr_start, range);
+	if (rc != -ENOENT) {
+		rc = rc == 0 ? -EEXIST : rc;
+		GOTO(out, rc);
+	}
+
+	if (new_range->lsr_start == range->lsr_end && range->lsr_end != 0 &&
+	    range_compare_loc(new_range, range) == 0) {
+		range_cpu_to_be(tmp, range);
+		rc = dt_delete(env, fld->lsf_obj,
+			       (struct dt_key *)&tmp->lsr_start, th,
+				BYPASS_CAPA);
+		if (rc != 0)
+			GOTO(out, rc);
+		memcpy(tmp, new_range, sizeof(*new_range));
+		tmp->lsr_start = range->lsr_start;
+		deleted = 1;
+	} else {
+		memcpy(tmp, new_range, sizeof(*new_range));
+	}
 
-        info = lu_context_key_get(&env->le_ctx, &fld_thread_key);
-        LASSERT(info != NULL);
+	range_cpu_to_be(tmp, tmp);
+	rc = dt_insert(env, fld->lsf_obj, (struct dt_rec *)tmp,
+		       (struct dt_key *)&tmp->lsr_start, th, BYPASS_CAPA, 1);
+	if (rc != 0) {
+		CERROR("%s: insert range "DRANGE" failed: rc = %d\n",
+		       fld->lsf_name, PRANGE(new_range), rc);
+		GOTO(out, rc);
+	}
 
-        info->fti_rec = cpu_to_be64(mds);
-        RETURN((void *)&info->fti_rec);
+	flde = fld_cache_entry_create(new_range);
+	if (IS_ERR(flde))
+		GOTO(out, rc = PTR_ERR(flde));
+
+	write_lock(&fld->lsf_cache->fci_lock);
+	if (deleted)
+		fld_cache_delete_nolock(fld->lsf_cache, new_range);
+	rc = fld_cache_insert_nolock(fld->lsf_cache, flde);
+	write_unlock(&fld->lsf_cache->fci_lock);
+	if (rc)
+		OBD_FREE_PTR(flde);
+out:
+	RETURN(rc);
 }
 
-int fld_index_create(struct lu_server_fld *fld,
-                     const struct lu_env *env,
-                     seqno_t seq, mdsno_t mds)
+/**
+ * lookup range for a seq passed. note here we only care about the start/end,
+ * caller should handle the attached location data (flags, index).
+ *
+ * \param  seq     seq for lookup.
+ * \param  range   result of lookup.
+ *
+ * \retval  0           found, \a range is the matched range;
+ * \retval -ENOENT      not found, \a range is the left-side range;
+ * \retval  -ve         other error;
+ */
+int fld_index_lookup(const struct lu_env *env, struct lu_server_fld *fld,
+		     seqno_t seq, struct lu_seq_range *range)
 {
-        struct dt_object *dt_obj = fld->lsf_obj;
-        struct dt_device *dt_dev;
-        struct txn_param txn;
-        struct thandle *th;
+        struct lu_seq_range     *fld_rec;
+        struct fld_thread_info  *info;
         int rc;
+
         ENTRY;
 
-        dt_dev = lu2dt_dev(fld->lsf_obj->do_lu.lo_dev);
+	info = lu_context_key_get(&env->le_ctx, &fld_thread_key);
+	fld_rec = &info->fti_rec;
 
-        /* stub here, will fix it later */
-        txn_param_init(&txn, FLD_TXN_INDEX_INSERT_CREDITS);
+	rc = fld_cache_lookup(fld->lsf_cache, seq, fld_rec);
+	if (rc == 0) {
+                *range = *fld_rec;
+                if (range_within(range, seq))
+                        rc = 0;
+                else
+                        rc = -ENOENT;
+        }
+
+        CDEBUG(D_INFO, "%s: lookup seq = "LPX64" range : "DRANGE" rc = %d\n",
+               fld->lsf_name, seq, PRANGE(range), rc);
 
-        th = dt_dev->dd_ops->dt_trans_start(env, dt_dev, &txn);
-        if (!IS_ERR(th)) {
-                rc = dt_obj->do_index_ops->dio_insert(env, dt_obj,
-                                                      fld_rec(env, mds),
-                                                      fld_key(env, seq),
-                                                      th, BYPASS_CAPA);
-                dt_dev->dd_ops->dt_trans_stop(env, th);
-        } else
-                rc = PTR_ERR(th);
         RETURN(rc);
 }
 
-int fld_index_delete(struct lu_server_fld *fld,
-                     const struct lu_env *env,
-                     seqno_t seq)
+static int fld_insert_entry(const struct lu_env *env,
+			    struct lu_server_fld *fld,
+			    const struct lu_seq_range *range)
 {
-        struct dt_object *dt_obj = fld->lsf_obj;
-        struct dt_device *dt_dev;
-        struct txn_param txn;
-        struct thandle *th;
-        int rc;
-        ENTRY;
+	struct thandle *th;
+	int rc;
+	ENTRY;
 
-        dt_dev = lu2dt_dev(fld->lsf_obj->do_lu.lo_dev);
-        txn_param_init(&txn, FLD_TXN_INDEX_DELETE_CREDITS);
-        th = dt_dev->dd_ops->dt_trans_start(env, dt_dev, &txn);
-        if (!IS_ERR(th)) {
-                rc = dt_obj->do_index_ops->dio_delete(env, dt_obj,
-                                                      fld_key(env, seq), th,
-                                                      BYPASS_CAPA);
-                dt_dev->dd_ops->dt_trans_stop(env, th);
-        } else
-                rc = PTR_ERR(th);
-        RETURN(rc);
+	th = dt_trans_create(env, lu2dt_dev(fld->lsf_obj->do_lu.lo_dev));
+	if (IS_ERR(th))
+		RETURN(PTR_ERR(th));
+
+	rc = fld_declare_index_create(env, fld, range, th);
+	if (rc != 0) {
+		if (rc == -EEXIST)
+			rc = 0;
+		GOTO(out, rc);
+	}
+
+	rc = dt_trans_start_local(env, lu2dt_dev(fld->lsf_obj->do_lu.lo_dev),
+				  th);
+	if (rc)
+		GOTO(out, rc);
+
+	rc = fld_index_create(env, fld, range, th);
+	if (rc == -EEXIST)
+		rc = 0;
+out:
+	dt_trans_stop(env, lu2dt_dev(fld->lsf_obj->do_lu.lo_dev), th);
+	RETURN(rc);
 }
 
-int fld_index_lookup(struct lu_server_fld *fld,
-                     const struct lu_env *env,
-                     seqno_t seq, mdsno_t *mds)
+static int fld_insert_special_entries(const struct lu_env *env,
+				      struct lu_server_fld *fld)
 {
-        struct dt_object *dt_obj = fld->lsf_obj;
-        struct dt_rec    *rec = fld_rec(env, 0);
-        int rc;
-        ENTRY;
+	int rc;
 
-        rc = dt_obj->do_index_ops->dio_lookup(env, dt_obj, rec,
-                                              fld_key(env, seq), BYPASS_CAPA);
-        if (rc == 0)
-                *mds = be64_to_cpu(*(__u64 *)rec);
-        RETURN(rc);
+	rc = fld_insert_entry(env, fld, &IGIF_FLD_RANGE);
+	if (rc != 0)
+		RETURN(rc);
+
+	rc = fld_insert_entry(env, fld, &ROOT_FLD_RANGE);
+
+	RETURN(rc);
 }
 
-int fld_index_init(struct lu_server_fld *fld,
-                   const struct lu_env *env,
-                   struct dt_device *dt)
+int fld_index_init(const struct lu_env *env, struct lu_server_fld *fld,
+		   struct dt_device *dt)
 {
-        struct dt_object *dt_obj;
-        struct lu_fid fid;
-        int rc;
-        ENTRY;
+	struct dt_object	*dt_obj = NULL;
+	struct lu_fid		fid;
+	struct lu_attr		*attr = NULL;
+	struct lu_seq_range	*range = NULL;
+	struct fld_thread_info	*info;
+	struct dt_object_format	dof;
+	struct dt_it		*it;
+	const struct dt_it_ops	*iops;
+	int			rc;
+	ENTRY;
 
-        dt_obj = dt_store_open(env, dt, fld_index_name, &fid);
-        if (!IS_ERR(dt_obj)) {
-                fld->lsf_obj = dt_obj;
-                rc = dt_obj->do_ops->do_index_try(env, dt_obj,
-                                                  &fld_index_features);
-                if (rc == 0)
-                        LASSERT(dt_obj->do_index_ops != NULL);
-                else
-                        CERROR("%s: File \"%s\" is not an index!\n",
-                               fld->lsf_name, fld_index_name);
-        } else {
-                CERROR("%s: Can't find \"%s\" obj %d\n",
-                       fld->lsf_name, fld_index_name, (int)PTR_ERR(dt_obj));
-                rc = PTR_ERR(dt_obj);
-        }
+	info = lu_context_key_get(&env->le_ctx, &fld_thread_key);
+	LASSERT(info != NULL);
 
-        RETURN(rc);
+	lu_local_obj_fid(&fid, FLD_INDEX_OID);
+	OBD_ALLOC_PTR(attr);
+	if (attr == NULL)
+		RETURN(-ENOMEM);
+
+	memset(attr, 0, sizeof(attr));
+	attr->la_valid = LA_MODE;
+	attr->la_mode = S_IFREG | 0666;
+	dof.dof_type = DFT_INDEX;
+	dof.u.dof_idx.di_feat = &fld_index_features;
+
+	dt_obj = dt_find_or_create(env, dt, &fid, &dof, attr);
+	if (IS_ERR(dt_obj)) {
+		rc = PTR_ERR(dt_obj);
+		CERROR("%s: Can't find \"%s\" obj %d\n", fld->lsf_name,
+			fld_index_name, rc);
+		dt_obj = NULL;
+		GOTO(out, rc);
+	}
+
+	fld->lsf_obj = dt_obj;
+	rc = dt_obj->do_ops->do_index_try(env, dt_obj, &fld_index_features);
+	if (rc != 0) {
+		CERROR("%s: File \"%s\" is not an index: rc = %d!\n",
+		       fld->lsf_name, fld_index_name, rc);
+		GOTO(out, rc);
+	}
+
+	range = &info->fti_rec;
+	/* Load fld entry to cache */
+	iops = &dt_obj->do_index_ops->dio_it;
+	it = iops->init(env, dt_obj, 0, NULL);
+	if (IS_ERR(it))
+		GOTO(out, rc = PTR_ERR(it));
+
+	rc = iops->load(env, it, 0);
+	if (rc < 0)
+		GOTO(out_it_fini, rc);
+
+	if (rc > 0) {
+		/* Load FLD entry into server cache */
+		do {
+			rc = iops->rec(env, it, (struct dt_rec *)range, 0);
+			if (rc != 0)
+				GOTO(out_it_put, rc);
+			LASSERT(range != NULL);
+			range_be_to_cpu(range, range);
+			rc = fld_cache_insert(fld->lsf_cache, range);
+			if (rc != 0)
+				GOTO(out_it_put, rc);
+			rc = iops->next(env, it);
+		} while (rc == 0);
+	}
+
+	/* Note: fld_insert_entry will detect whether these
+	 * special entries already exist inside FLDB */
+	mutex_lock(&fld->lsf_lock);
+	rc = fld_insert_special_entries(env, fld);
+	mutex_unlock(&fld->lsf_lock);
+	if (rc != 0) {
+		CERROR("%s: insert special entries failed!: rc = %d\n",
+		       fld->lsf_name, rc);
+		GOTO(out_it_put, rc);
+	}
+
+out_it_put:
+	iops->put(env, it);
+out_it_fini:
+	iops->fini(env, it);
+out:
+	if (attr != NULL)
+		OBD_FREE_PTR(attr);
+
+	if (rc != 0) {
+		if (dt_obj != NULL)
+			lu_object_put(env, &dt_obj->do_lu);
+		fld->lsf_obj = NULL;
+	}
+	RETURN(rc);
 }
 
-void fld_index_fini(struct lu_server_fld *fld,
-                    const struct lu_env *env)
+void fld_index_fini(const struct lu_env *env, struct lu_server_fld *fld)
 {
-        ENTRY;
-        if (fld->lsf_obj != NULL) {
-                if (!IS_ERR(fld->lsf_obj))
-                        lu_object_put(env, &fld->lsf_obj->do_lu);
-                fld->lsf_obj = NULL;
-        }
-        EXIT;
+	ENTRY;
+	if (fld->lsf_obj != NULL) {
+		if (!IS_ERR(fld->lsf_obj))
+			lu_object_put(env, &fld->lsf_obj->do_lu);
+		fld->lsf_obj = NULL;
+	}
+	EXIT;
 }