1 files changed, 533 insertions, 0 deletions

diff --git a/drivers/staging/lustre/lustre/lov/lov_dev.c b/drivers/staging/lustre/lustre/lov/lov_dev.c
new file mode 100644
index 000000000000..f94f8d9d33d7
--- /dev/null
+++ b/drivers/staging/lustre/lustre/lov/lov_dev.c
@@ -0,0 +1,533 @@
+/*
+ * 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) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2012, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ *
+ * Implementation of cl_device and cl_device_type for LOV layer.
+ *
+ *   Author: Nikita Danilov <nikita.danilov@sun.com>
+ */
+
+#define DEBUG_SUBSYSTEM S_LOV
+
+/* class_name2obd() */
+#include <obd_class.h>
+
+#include "lov_cl_internal.h"
+
+struct kmem_cache *lov_lock_kmem;
+struct kmem_cache *lov_object_kmem;
+struct kmem_cache *lov_thread_kmem;
+struct kmem_cache *lov_session_kmem;
+struct kmem_cache *lov_req_kmem;
+
+struct kmem_cache *lovsub_lock_kmem;
+struct kmem_cache *lovsub_object_kmem;
+struct kmem_cache *lovsub_req_kmem;
+
+struct kmem_cache *lov_lock_link_kmem;
+
+/** Lock class of lov_device::ld_mutex. */
+struct lock_class_key cl_lov_device_mutex_class;
+
+struct lu_kmem_descr lov_caches[] = {
+	{
+		.ckd_cache = &lov_lock_kmem,
+		.ckd_name  = "lov_lock_kmem",
+		.ckd_size  = sizeof (struct lov_lock)
+	},
+	{
+		.ckd_cache = &lov_object_kmem,
+		.ckd_name  = "lov_object_kmem",
+		.ckd_size  = sizeof (struct lov_object)
+	},
+	{
+		.ckd_cache = &lov_thread_kmem,
+		.ckd_name  = "lov_thread_kmem",
+		.ckd_size  = sizeof (struct lov_thread_info)
+	},
+	{
+		.ckd_cache = &lov_session_kmem,
+		.ckd_name  = "lov_session_kmem",
+		.ckd_size  = sizeof (struct lov_session)
+	},
+	{
+		.ckd_cache = &lov_req_kmem,
+		.ckd_name  = "lov_req_kmem",
+		.ckd_size  = sizeof (struct lov_req)
+	},
+	{
+		.ckd_cache = &lovsub_lock_kmem,
+		.ckd_name  = "lovsub_lock_kmem",
+		.ckd_size  = sizeof (struct lovsub_lock)
+	},
+	{
+		.ckd_cache = &lovsub_object_kmem,
+		.ckd_name  = "lovsub_object_kmem",
+		.ckd_size  = sizeof (struct lovsub_object)
+	},
+	{
+		.ckd_cache = &lovsub_req_kmem,
+		.ckd_name  = "lovsub_req_kmem",
+		.ckd_size  = sizeof (struct lovsub_req)
+	},
+	{
+		.ckd_cache = &lov_lock_link_kmem,
+		.ckd_name  = "lov_lock_link_kmem",
+		.ckd_size  = sizeof (struct lov_lock_link)
+	},
+	{
+		.ckd_cache = NULL
+	}
+};
+
+/*****************************************************************************
+ *
+ * Lov transfer operations.
+ *
+ */
+
+static void lov_req_completion(const struct lu_env *env,
+			       const struct cl_req_slice *slice, int ioret)
+{
+	struct lov_req *lr;
+
+	ENTRY;
+	lr = cl2lov_req(slice);
+	OBD_SLAB_FREE_PTR(lr, lov_req_kmem);
+	EXIT;
+}
+
+static const struct cl_req_operations lov_req_ops = {
+	.cro_completion = lov_req_completion
+};
+
+/*****************************************************************************
+ *
+ * Lov device and device type functions.
+ *
+ */
+
+static void *lov_key_init(const struct lu_context *ctx,
+			  struct lu_context_key *key)
+{
+	struct lov_thread_info *info;
+
+	OBD_SLAB_ALLOC_PTR_GFP(info, lov_thread_kmem, __GFP_IO);
+	if (info != NULL)
+		INIT_LIST_HEAD(&info->lti_closure.clc_list);
+	else
+		info = ERR_PTR(-ENOMEM);
+	return info;
+}
+
+static void lov_key_fini(const struct lu_context *ctx,
+			 struct lu_context_key *key, void *data)
+{
+	struct lov_thread_info *info = data;
+	LINVRNT(list_empty(&info->lti_closure.clc_list));
+	OBD_SLAB_FREE_PTR(info, lov_thread_kmem);
+}
+
+struct lu_context_key lov_key = {
+	.lct_tags = LCT_CL_THREAD,
+	.lct_init = lov_key_init,
+	.lct_fini = lov_key_fini
+};
+
+static void *lov_session_key_init(const struct lu_context *ctx,
+				  struct lu_context_key *key)
+{
+	struct lov_session *info;
+
+	OBD_SLAB_ALLOC_PTR_GFP(info, lov_session_kmem, __GFP_IO);
+	if (info == NULL)
+		info = ERR_PTR(-ENOMEM);
+	return info;
+}
+
+static void lov_session_key_fini(const struct lu_context *ctx,
+				 struct lu_context_key *key, void *data)
+{
+	struct lov_session *info = data;
+	OBD_SLAB_FREE_PTR(info, lov_session_kmem);
+}
+
+struct lu_context_key lov_session_key = {
+	.lct_tags = LCT_SESSION,
+	.lct_init = lov_session_key_init,
+	.lct_fini = lov_session_key_fini
+};
+
+/* type constructor/destructor: lov_type_{init,fini,start,stop}() */
+LU_TYPE_INIT_FINI(lov, &lov_key, &lov_session_key);
+
+static struct lu_device *lov_device_fini(const struct lu_env *env,
+					 struct lu_device *d)
+{
+	int i;
+	struct lov_device *ld = lu2lov_dev(d);
+
+	LASSERT(ld->ld_lov != NULL);
+	if (ld->ld_target == NULL)
+		RETURN(NULL);
+
+	lov_foreach_target(ld, i) {
+		struct lovsub_device *lsd;
+
+		lsd = ld->ld_target[i];
+		if (lsd != NULL) {
+			cl_stack_fini(env, lovsub2cl_dev(lsd));
+			ld->ld_target[i] = NULL;
+		}
+	}
+	RETURN(NULL);
+}
+
+static int lov_device_init(const struct lu_env *env, struct lu_device *d,
+			   const char *name, struct lu_device *next)
+{
+	struct lov_device *ld = lu2lov_dev(d);
+	int i;
+	int rc = 0;
+
+	LASSERT(d->ld_site != NULL);
+	if (ld->ld_target == NULL)
+		RETURN(rc);
+
+	lov_foreach_target(ld, i) {
+		struct lovsub_device *lsd;
+		struct cl_device     *cl;
+		struct lov_tgt_desc  *desc;
+
+		desc = ld->ld_lov->lov_tgts[i];
+		if (desc == NULL)
+			continue;
+
+		cl = cl_type_setup(env, d->ld_site, &lovsub_device_type,
+				   desc->ltd_obd->obd_lu_dev);
+		if (IS_ERR(cl)) {
+			rc = PTR_ERR(cl);
+			break;
+		}
+		lsd = cl2lovsub_dev(cl);
+		lsd->acid_idx = i;
+		lsd->acid_super = ld;
+		ld->ld_target[i] = lsd;
+	}
+
+	if (rc)
+		lov_device_fini(env, d);
+	else
+		ld->ld_flags |= LOV_DEV_INITIALIZED;
+
+	RETURN(rc);
+}
+
+static int lov_req_init(const struct lu_env *env, struct cl_device *dev,
+			struct cl_req *req)
+{
+	struct lov_req *lr;
+	int result;
+
+	ENTRY;
+	OBD_SLAB_ALLOC_PTR_GFP(lr, lov_req_kmem, __GFP_IO);
+	if (lr != NULL) {
+		cl_req_slice_add(req, &lr->lr_cl, dev, &lov_req_ops);
+		result = 0;
+	} else
+		result = -ENOMEM;
+	RETURN(result);
+}
+
+static const struct cl_device_operations lov_cl_ops = {
+	.cdo_req_init = lov_req_init
+};
+
+static void lov_emerg_free(struct lov_device_emerg **emrg, int nr)
+{
+	int i;
+
+	for (i = 0; i < nr; ++i) {
+		struct lov_device_emerg *em;
+
+		em = emrg[i];
+		if (em != NULL) {
+			LASSERT(em->emrg_page_list.pl_nr == 0);
+			if (em->emrg_env != NULL)
+				cl_env_put(em->emrg_env, &em->emrg_refcheck);
+			OBD_FREE_PTR(em);
+		}
+	}
+	OBD_FREE(emrg, nr * sizeof emrg[0]);
+}
+
+static struct lu_device *lov_device_free(const struct lu_env *env,
+					 struct lu_device *d)
+{
+	struct lov_device *ld = lu2lov_dev(d);
+	const int	  nr = ld->ld_target_nr;
+
+	cl_device_fini(lu2cl_dev(d));
+	if (ld->ld_target != NULL)
+		OBD_FREE(ld->ld_target, nr * sizeof ld->ld_target[0]);
+	if (ld->ld_emrg != NULL)
+		lov_emerg_free(ld->ld_emrg, nr);
+	OBD_FREE_PTR(ld);
+	return NULL;
+}
+
+static void lov_cl_del_target(const struct lu_env *env, struct lu_device *dev,
+			      __u32 index)
+{
+	struct lov_device *ld = lu2lov_dev(dev);
+	ENTRY;
+
+	if (ld->ld_target[index] != NULL) {
+		cl_stack_fini(env, lovsub2cl_dev(ld->ld_target[index]));
+		ld->ld_target[index] = NULL;
+	}
+	EXIT;
+}
+
+static struct lov_device_emerg **lov_emerg_alloc(int nr)
+{
+	struct lov_device_emerg **emerg;
+	int i;
+	int result;
+
+	OBD_ALLOC(emerg, nr * sizeof emerg[0]);
+	if (emerg == NULL)
+		return ERR_PTR(-ENOMEM);
+	for (result = i = 0; i < nr && result == 0; i++) {
+		struct lov_device_emerg *em;
+
+		OBD_ALLOC_PTR(em);
+		if (em != NULL) {
+			emerg[i] = em;
+			cl_page_list_init(&em->emrg_page_list);
+			em->emrg_env = cl_env_alloc(&em->emrg_refcheck,
+						    LCT_REMEMBER|LCT_NOREF);
+			if (!IS_ERR(em->emrg_env))
+				em->emrg_env->le_ctx.lc_cookie = 0x2;
+			else {
+				result = PTR_ERR(em->emrg_env);
+				em->emrg_env = NULL;
+			}
+		} else
+			result = -ENOMEM;
+	}
+	if (result != 0) {
+		lov_emerg_free(emerg, nr);
+		emerg = ERR_PTR(result);
+	}
+	return emerg;
+}
+
+static int lov_expand_targets(const struct lu_env *env, struct lov_device *dev)
+{
+	int   result;
+	__u32 tgt_size;
+	__u32 sub_size;
+
+	ENTRY;
+	result = 0;
+	tgt_size = dev->ld_lov->lov_tgt_size;
+	sub_size = dev->ld_target_nr;
+	if (sub_size < tgt_size) {
+		struct lovsub_device    **newd;
+		struct lov_device_emerg **emerg;
+		const size_t	      sz   = sizeof newd[0];
+
+		emerg = lov_emerg_alloc(tgt_size);
+		if (IS_ERR(emerg))
+			RETURN(PTR_ERR(emerg));
+
+		OBD_ALLOC(newd, tgt_size * sz);
+		if (newd != NULL) {
+			mutex_lock(&dev->ld_mutex);
+			if (sub_size > 0) {
+				memcpy(newd, dev->ld_target, sub_size * sz);
+				OBD_FREE(dev->ld_target, sub_size * sz);
+			}
+			dev->ld_target    = newd;
+			dev->ld_target_nr = tgt_size;
+
+			if (dev->ld_emrg != NULL)
+				lov_emerg_free(dev->ld_emrg, sub_size);
+			dev->ld_emrg = emerg;
+			mutex_unlock(&dev->ld_mutex);
+		} else {
+			lov_emerg_free(emerg, tgt_size);
+			result = -ENOMEM;
+		}
+	}
+	RETURN(result);
+}
+
+static int lov_cl_add_target(const struct lu_env *env, struct lu_device *dev,
+			     __u32 index)
+{
+	struct obd_device    *obd = dev->ld_obd;
+	struct lov_device    *ld  = lu2lov_dev(dev);
+	struct lov_tgt_desc  *tgt;
+	struct lovsub_device *lsd;
+	struct cl_device     *cl;
+	int rc;
+	ENTRY;
+
+	obd_getref(obd);
+
+	tgt = obd->u.lov.lov_tgts[index];
+	LASSERT(tgt != NULL);
+	LASSERT(tgt->ltd_obd != NULL);
+
+	if (!tgt->ltd_obd->obd_set_up) {
+		CERROR("Target %s not set up\n", obd_uuid2str(&tgt->ltd_uuid));
+		RETURN(-EINVAL);
+	}
+
+	rc = lov_expand_targets(env, ld);
+	if (rc == 0 && ld->ld_flags & LOV_DEV_INITIALIZED) {
+		LASSERT(dev->ld_site != NULL);
+
+		cl = cl_type_setup(env, dev->ld_site, &lovsub_device_type,
+				   tgt->ltd_obd->obd_lu_dev);
+		if (!IS_ERR(cl)) {
+			lsd = cl2lovsub_dev(cl);
+			lsd->acid_idx = index;
+			lsd->acid_super = ld;
+			ld->ld_target[index] = lsd;
+		} else {
+			CERROR("add failed (%d), deleting %s\n", rc,
+			       obd_uuid2str(&tgt->ltd_uuid));
+			lov_cl_del_target(env, dev, index);
+			rc = PTR_ERR(cl);
+		}
+	}
+	obd_putref(obd);
+	RETURN(rc);
+}
+
+static int lov_process_config(const struct lu_env *env,
+			      struct lu_device *d, struct lustre_cfg *cfg)
+{
+	struct obd_device *obd = d->ld_obd;
+	int cmd;
+	int rc;
+	int gen;
+	__u32 index;
+
+	obd_getref(obd);
+
+	cmd = cfg->lcfg_command;
+	rc = lov_process_config_base(d->ld_obd, cfg, &index, &gen);
+	if (rc == 0) {
+		switch(cmd) {
+		case LCFG_LOV_ADD_OBD:
+		case LCFG_LOV_ADD_INA:
+			rc = lov_cl_add_target(env, d, index);
+			if (rc != 0)
+				lov_del_target(d->ld_obd, index, 0, 0);
+			break;
+		case LCFG_LOV_DEL_OBD:
+			lov_cl_del_target(env, d, index);
+			break;
+		}
+	}
+	obd_putref(obd);
+	RETURN(rc);
+}
+
+static const struct lu_device_operations lov_lu_ops = {
+	.ldo_object_alloc      = lov_object_alloc,
+	.ldo_process_config    = lov_process_config,
+};
+
+static struct lu_device *lov_device_alloc(const struct lu_env *env,
+					  struct lu_device_type *t,
+					  struct lustre_cfg *cfg)
+{
+	struct lu_device *d;
+	struct lov_device *ld;
+	struct obd_device *obd;
+	int rc;
+
+	OBD_ALLOC_PTR(ld);
+	if (ld == NULL)
+		RETURN(ERR_PTR(-ENOMEM));
+
+	cl_device_init(&ld->ld_cl, t);
+	d = lov2lu_dev(ld);
+	d->ld_ops	= &lov_lu_ops;
+	ld->ld_cl.cd_ops = &lov_cl_ops;
+
+	mutex_init(&ld->ld_mutex);
+	lockdep_set_class(&ld->ld_mutex, &cl_lov_device_mutex_class);
+
+	/* setup the LOV OBD */
+	obd = class_name2obd(lustre_cfg_string(cfg, 0));
+	LASSERT(obd != NULL);
+	rc = lov_setup(obd, cfg);
+	if (rc) {
+		lov_device_free(env, d);
+		RETURN(ERR_PTR(rc));
+	}
+
+	ld->ld_lov = &obd->u.lov;
+	RETURN(d);
+}
+
+static const struct lu_device_type_operations lov_device_type_ops = {
+	.ldto_init = lov_type_init,
+	.ldto_fini = lov_type_fini,
+
+	.ldto_start = lov_type_start,
+	.ldto_stop  = lov_type_stop,
+
+	.ldto_device_alloc = lov_device_alloc,
+	.ldto_device_free  = lov_device_free,
+
+	.ldto_device_init    = lov_device_init,
+	.ldto_device_fini    = lov_device_fini
+};
+
+struct lu_device_type lov_device_type = {
+	.ldt_tags     = LU_DEVICE_CL,
+	.ldt_name     = LUSTRE_LOV_NAME,
+	.ldt_ops      = &lov_device_type_ops,
+	.ldt_ctx_tags = LCT_CL_THREAD
+};
+EXPORT_SYMBOL(lov_device_type);
+
+/** @} lov */