/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
 * vim:expandtab:shiftwidth=8:tabstop=8:
 *
 *  Copyright (c) 2002 Cluster File Systems, Inc. <info@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_CMOBD

#include <linux/version.h>
#include <linux/init.h>
#include <linux/obd_support.h>
#include <linux/lustre_lib.h>
#include <linux/lustre_net.h>
#include <linux/lustre_idl.h>
#include <linux/obd_class.h>
#include <linux/lustre_log.h>
#include <linux/lustre_cmobd.h>
#include <linux/lustre_fsfilt.h>
#include <linux/lustre_smfs.h>

#include "cmobd_internal.h"

static int cmobd_reint_record(int opcode, struct obd_device *obd, char *record)
{
        int rc = 0;
        
        switch (opcode) {
        case OST_CREATE:
                rc = cmobd_reint_create(obd, record);
                break;                       
        case OST_SETATTR:
                rc = cmobd_reint_setattr(obd, record);
                break;                       
        case OST_WRITE:
                rc = cmobd_reint_write(obd, record);
                break;                       
        case MDS_REINT:
                rc = cmobd_reint_mds(obd, record);
                break;                       
        default:
                CERROR("unrecognized format %d\n", opcode);
                rc = -EINVAL;
                break; 
        }
        return rc;
}  
static int cmobd_reint_cb(struct llog_handle *llh, struct llog_rec_hdr *rec,
                          void *data)
{
        struct obd_device *obd = (struct obd_device*)data;
        char *buf, *pbuf;
        int rc = 0, opcode;
        
        ENTRY;

        if (!(llh->lgh_hdr->llh_flags & LLOG_F_IS_PLAIN)) {
                CERROR("log is not plain log\n");
                RETURN(-EINVAL);
        }
        if (rec->lrh_type != SMFS_UPDATE_REC)
		RETURN(-EINVAL);

        buf = (char *)(rec + 1);
        rc = smfs_rec_unpack(NULL, buf, &pbuf, &opcode);
        if (rc)
                GOTO(out, rc);
        rc = cmobd_reint_record(opcode, obd, pbuf); 
        if (rc)
                GOTO(out, rc);
        /*delete this record*/
        rc = LLOG_DEL_RECORD; 
out:
        RETURN(rc);
}

int cmobd_reintegrate(struct obd_device *obd)
{
        struct cache_manager_obd *cmobd = &obd->u.cmobd;
        struct llog_ctxt *ctxt = NULL;
        struct llog_handle *llh;
        int val_size, rc = 0;
        ENTRY;

        /* XXX just fetch the reintegration log context from
         * cache ost directly, use logid later ?? */
        val_size = sizeof(ctxt);
        rc = obd_get_info(cmobd->cm_cache_exp, strlen("reint_log") + 1,
                          "reint_log", &val_size, &ctxt);
        if (rc)
                RETURN(rc);

        /* use the already opened log handle instead of 
         * reopen a new log handle */
        llh = ctxt ? ctxt->loc_handle : NULL;
        if (llh == NULL)
                RETURN(-EFAULT);

        /* FIXME should we insert a LLOG_GEN_REC before process log ? */
        rc = llog_cat_process(llh, (llog_cb_t)cmobd_reint_cb, obd);

        RETURN(rc);
}