/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
 * vim:expandtab:shiftwidth=8:tabstop=8:
 *
 *  lustre/mds/mds_log.c
 *
 *  Copyright (c) 2001-2003 Cluster File Systems, Inc.
 *   Author: Peter Braam <braam@clusterfs.com>
 *   Author: Andreas Dilger <adilger@clusterfs.com>
 *   Author: Phil Schwan <phil@clusterfs.com>
 *
 *   This file is part of Lustre, http://www.lustre.org.
 *
 *   Lustre is free software; you can redistribute it and/or
 *   modify it under the terms of version 2 of the GNU General Public
 *   License as published by the Free Software Foundation.
 *
 *   Lustre 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 for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with Lustre; if not, write to the Free Software
 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#define DEBUG_SUBSYSTEM S_MDS

#include <linux/config.h>
#include <linux/module.h>
#include <linux/version.h>

#include <libcfs/list.h>
#include <linux/obd_class.h>
#include <linux/lustre_fsfilt.h>
#include <linux/lustre_commit_confd.h>

#include "mds_internal.h"

static int mds_llog_origin_add(struct llog_ctxt *ctxt, struct llog_rec_hdr *rec,
                               void *buf, struct llog_cookie *logcookies,
                               int numcookies, void *data,
                               struct rw_semaphore **lock, int *lock_count)
{
        struct obd_device *obd = ctxt->loc_obd;
        struct obd_device *lov_obd = obd->u.mds.mds_dt_obd;
        struct llog_ctxt *lctxt;
        int rc;
        ENTRY;

        lctxt = llog_get_context(&lov_obd->obd_llogs, ctxt->loc_idx);
        rc = llog_add(lctxt, rec, buf, logcookies, numcookies, data,
                      lock, lock_count);
        RETURN(rc);
}

static int mds_llog_origin_connect(struct llog_ctxt *ctxt, int count,
                                   struct llog_logid *logid,
                                   struct llog_gen *gen, struct obd_uuid *uuid)
{
        struct obd_device *obd = ctxt->loc_obd;
        struct obd_device *lov_obd = obd->u.mds.mds_dt_obd;
        struct llog_ctxt *lctxt;
        int rc;
        ENTRY;

        lctxt = llog_get_context(&lov_obd->obd_llogs, ctxt->loc_idx);
        rc = llog_connect(lctxt, count, logid, gen, uuid);
        RETURN(rc);
}

static int mds_llog_repl_cancel(struct llog_ctxt *ctxt, int count, 
                                struct llog_cookie *cookies, int flags,
                                void *data)
{
        struct obd_device *obd = ctxt->loc_obd;
        struct obd_device *lov_obd = obd->u.mds.mds_dt_obd;
        struct llog_ctxt *lctxt;
        int rc;
        ENTRY;

        lctxt = llog_get_context(&lov_obd->obd_llogs, ctxt->loc_idx);
        rc = llog_cancel(lctxt, count, cookies, flags, data);
        RETURN(rc);
}

int mds_log_op_unlink(struct obd_device *obd, struct inode *inode,
                      struct lov_mds_md *lmm, int lmm_size,
                      struct llog_cookie *logcookies, int cookies_size,
                      struct llog_create_locks **res)
{
        struct mds_obd *mds = &obd->u.mds;
        struct lov_stripe_md *lsm = NULL;
        struct llog_ctxt *ctxt;
        struct llog_create_locks *lcl = NULL;
        int rc, size = 0,offset = offsetof(struct llog_create_locks, lcl_locks);
        int lock_count = 0;
        ENTRY;

        if (IS_ERR(mds->mds_dt_obd))
                RETURN(PTR_ERR(mds->mds_dt_obd));

        RETURN(0);

        rc = obd_unpackmd(mds->mds_dt_exp, &lsm, lmm, lmm_size);
        if (rc < 0)
                RETURN(rc);

        if (res != NULL) {
                size = offset +
                       sizeof(struct rw_semaphore *) * lsm->lsm_stripe_count;
                OBD_ALLOC(lcl, size);
                if (lcl == NULL)
                        RETURN(-ENOMEM);

                lcl->lcl_count = lsm->lsm_stripe_count;
                *res = lcl;
        }

        ctxt = llog_get_context(&obd->obd_llogs, LLOG_UNLINK_ORIG_CTXT);
        rc = llog_add(ctxt, NULL, lsm, logcookies,
                      cookies_size / sizeof(struct llog_cookie), NULL,
                      res ? &lcl->lcl_locks[0] : NULL, &lock_count);

        obd_free_memmd(mds->mds_dt_exp, &lsm);

        if (res && (rc <= 0 || lock_count == 0)) {
                OBD_FREE(lcl, size);
                *res = NULL;
        }

        RETURN(rc);
}

static struct llog_operations mds_unlink_orig_logops = {
        lop_add:        mds_llog_origin_add,
        lop_connect:    mds_llog_origin_connect,
};

static struct llog_operations mds_size_repl_logops = {
        lop_cancel:     mds_llog_repl_cancel,
};

int mds_llog_init(struct obd_device *obd, struct obd_llogs *llogs,
                  struct obd_device *tgt, int count, struct llog_catid *logid)
{
        struct obd_device *lov_obd = obd->u.mds.mds_dt_obd;
        int rc;
        ENTRY;

        rc = obd_llog_setup(obd, llogs, LLOG_UNLINK_ORIG_CTXT, tgt, 0, NULL,
                            &mds_unlink_orig_logops);
        if (rc)
                RETURN(rc);

        rc = obd_llog_setup(obd, llogs, LLOG_SIZE_REPL_CTXT, tgt, 0, NULL,
                            &mds_size_repl_logops);
        if (rc)
                RETURN(rc);

        rc = obd_llog_init(lov_obd, &lov_obd->obd_llogs, tgt, count, logid);
        if (rc)
                CERROR("error lov_llog_init\n");

        RETURN(rc);
}

int mds_llog_finish(struct obd_device *obd, struct obd_llogs *llogs, int count)
{
        struct obd_device *lov_obd = obd->u.mds.mds_dt_obd;
        int rc;
        ENTRY;

        rc = obd_llog_cleanup(llog_get_context(llogs, LLOG_UNLINK_ORIG_CTXT));
        if (rc)
                RETURN(rc);

        rc = obd_llog_cleanup(llog_get_context(llogs, LLOG_SIZE_REPL_CTXT));
        if (rc)
                RETURN(rc);

        rc = obd_llog_finish(lov_obd, &lov_obd->obd_llogs, count);
        if (rc)
                CERROR("error lov_llog_finish\n");

        RETURN(rc);
}