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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) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*/
/*
* 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 LOVSUB layer.
*
* Author: Nikita Danilov <nikita.danilov@sun.com>
*/
#define DEBUG_SUBSYSTEM S_LOV
#include "lov_cl_internal.h"
/** \addtogroup lov
* @{
*/
/*****************************************************************************
*
* Lovsub transfer operations.
*
*/
static void lovsub_req_completion(const struct lu_env *env,
const struct cl_req_slice *slice, int ioret)
{
struct lovsub_req *lsr;
lsr = cl2lovsub_req(slice);
OBD_SLAB_FREE_PTR(lsr, lovsub_req_kmem);
}
/**
* Implementation of struct cl_req_operations::cro_attr_set() for lovsub
* layer. Lov and lovsub are responsible only for struct obdo::o_stripe_idx
* field, which is filled there.
*/
static void lovsub_req_attr_set(const struct lu_env *env,
const struct cl_req_slice *slice,
const struct cl_object *obj,
struct cl_req_attr *attr, obd_valid flags)
{
struct lovsub_object *subobj;
subobj = cl2lovsub(obj);
/*
* There is no OBD_MD_* flag for obdo::o_stripe_idx, so set it
* unconditionally. It never changes anyway.
*/
attr->cra_oa->o_stripe_idx = subobj->lso_index;
}
static const struct cl_req_operations lovsub_req_ops = {
.cro_attr_set = lovsub_req_attr_set,
.cro_completion = lovsub_req_completion
};
/*****************************************************************************
*
* Lov-sub device and device type functions.
*
*/
static int lovsub_device_init(const struct lu_env *env, struct lu_device *d,
const char *name, struct lu_device *next)
{
struct lovsub_device *lsd = lu2lovsub_dev(d);
struct lu_device_type *ldt;
int rc;
next->ld_site = d->ld_site;
ldt = next->ld_type;
LASSERT(ldt != NULL);
rc = ldt->ldt_ops->ldto_device_init(env, next, ldt->ldt_name, NULL);
if (rc) {
next->ld_site = NULL;
return rc;
}
lu_device_get(next);
lu_ref_add(&next->ld_reference, "lu-stack", &lu_site_init);
lsd->acid_next = lu2cl_dev(next);
return rc;
}
static struct lu_device *lovsub_device_fini(const struct lu_env *env,
struct lu_device *d)
{
struct lu_device *next;
struct lovsub_device *lsd;
lsd = lu2lovsub_dev(d);
next = cl2lu_dev(lsd->acid_next);
lsd->acid_super = NULL;
lsd->acid_next = NULL;
return next;
}
static struct lu_device *lovsub_device_free(const struct lu_env *env,
struct lu_device *d)
{
struct lovsub_device *lsd = lu2lovsub_dev(d);
struct lu_device *next = cl2lu_dev(lsd->acid_next);
if (atomic_read(&d->ld_ref) && d->ld_site) {
LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, D_ERROR, NULL);
lu_site_print(env, d->ld_site, &msgdata, lu_cdebug_printer);
}
cl_device_fini(lu2cl_dev(d));
OBD_FREE_PTR(lsd);
return next;
}
static int lovsub_req_init(const struct lu_env *env, struct cl_device *dev,
struct cl_req *req)
{
struct lovsub_req *lsr;
int result;
OBD_SLAB_ALLOC_PTR_GFP(lsr, lovsub_req_kmem, __GFP_IO);
if (lsr != NULL) {
cl_req_slice_add(req, &lsr->lsrq_cl, dev, &lovsub_req_ops);
result = 0;
} else
result = -ENOMEM;
return result;
}
static const struct lu_device_operations lovsub_lu_ops = {
.ldo_object_alloc = lovsub_object_alloc,
.ldo_process_config = NULL,
.ldo_recovery_complete = NULL
};
static const struct cl_device_operations lovsub_cl_ops = {
.cdo_req_init = lovsub_req_init
};
static struct lu_device *lovsub_device_alloc(const struct lu_env *env,
struct lu_device_type *t,
struct lustre_cfg *cfg)
{
struct lu_device *d;
struct lovsub_device *lsd;
OBD_ALLOC_PTR(lsd);
if (lsd != NULL) {
int result;
result = cl_device_init(&lsd->acid_cl, t);
if (result == 0) {
d = lovsub2lu_dev(lsd);
d->ld_ops = &lovsub_lu_ops;
lsd->acid_cl.cd_ops = &lovsub_cl_ops;
} else
d = ERR_PTR(result);
} else
d = ERR_PTR(-ENOMEM);
return d;
}
static const struct lu_device_type_operations lovsub_device_type_ops = {
.ldto_device_alloc = lovsub_device_alloc,
.ldto_device_free = lovsub_device_free,
.ldto_device_init = lovsub_device_init,
.ldto_device_fini = lovsub_device_fini
};
#define LUSTRE_LOVSUB_NAME "lovsub"
struct lu_device_type lovsub_device_type = {
.ldt_tags = LU_DEVICE_CL,
.ldt_name = LUSTRE_LOVSUB_NAME,
.ldt_ops = &lovsub_device_type_ops,
.ldt_ctx_tags = LCT_CL_THREAD
};
/** @} lov */
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