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[unleashed.git] / usr / src / lib / lvm / libmeta / common / meta_mn_changelog.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <stdlib.h>
#include <unistd.h>
#include <wait.h>
#include <sys/time.h>
#include <meta.h>
#include <metad.h>
#include <mdmn_changelog.h>
#include <syslog.h>
#include <umem.h>

/*
 * Number of log entries per set.
 *
 * We want at least 4 spares available at all times
 * in case new classes are added during a live upgrade.
 *
 * Allocate the entries in chunks of 16
 */
#define MDMN_LOGRECS_QUANTA     16
#define MDMN_LOGRECS_MINSPARES  4
#define MDMN_LOGHDR_SIZE        sizeof (mdmn_changelog_record_t)
#define MDMN_LOGRECSIZE (MDMN_LOGHDR_SIZE + MD_MN_MSG_MAXDATALEN)
#define MDMN_LOGRECSIZE_OD      sizeof (mdmn_changelog_record_od_t)
#define MDMN_LOGRECS_TRIMUP     ((MD_MN_NCLASSES % MDMN_LOGRECS_QUANTA) > \
                                (MDMN_LOGRECS_QUANTA - MDMN_LOGRECS_MINSPARES))

static int      mdmn_commitlog(md_set_desc *, md_error_t *);
static int      mdmn_log_it(set_t, md_error_t *, mdmn_changelog_record_t *lr);


/* Global variables */

mdmn_changelog_record_t *mdmn_changelog[MD_MAXSETS];
int mdmn_changelog_snarfed[MD_MAXSETS];

/* Total number of log records */
int mdmn_logrecs = (MDMN_LOGRECS_QUANTA +
                ((MD_MN_NCLASSES/MDMN_LOGRECS_QUANTA) * MDMN_LOGRECS_QUANTA));

#ifdef DEBUG
void
dump_rec(char *fn_name, mdmn_changelog_record_t *lr)
{
        syslog(LOG_DEBUG, "%s incore: selfid 0x%x class %d flags %d "
            "msglen %d\n", fn_name, lr->lr_selfid, lr->lr_class,
            lr->lr_flags, lr->lr_msglen);
}
void
dump_rec_od(char *fn_name, mdmn_changelog_record_od_t *lr)
{
        syslog(LOG_DEBUG, "%s ondisk: selfid 0x%x class %d flags %d "
            "msglen %d\n", fn_name, lr->lr_selfid, lr->lr_class,
            lr->lr_flags, lr->lr_msglen);
}

void
dump_array(char *fn_name, set_t setno)
{
        int i;
        char tchar[80];

        mdmn_changelog_record_t *tlr;

        for (i = 0; i < mdmn_logrecs; i++) {
                tlr = &mdmn_changelog[setno][i];
                (void) snprintf(tchar, sizeof (tchar), "%s class %d ",
                    fn_name, i);
                dump_rec(tchar, tlr);
        }
}
#endif

/*
 * copy_changelog: copies changelog ondisk<->incore records.
 * The argument "direction" controls the direction to copy the
 * the records. Incore and ondisk changlog structures must be
 * allocated when calling this routine.
 *
 * The purpose of changelog is to store a message that is in progress.
 * Therefore the changlog structure embeds the message structure.
 * Incore and ondisk changelog structures are created to handle the
 * incore and ondisk message formats. The incore message has a pointer
 * to the payload. The ondisk message format has payload embedded as
 * part of the message.
 *
 * Caveat Emptor: Incore and ondisk structures have the payload buffers
 * correctly allocated.
 */

static void
copy_changelog(mdmn_changelog_record_t *incp,
                mdmn_changelog_record_od_t *odp, int direction)
{
        assert(incp != NULL && odp != NULL);
        assert((direction == MD_MN_COPY_TO_ONDISK) ||
            (direction == MD_MN_COPY_TO_INCORE));

        if (direction == MD_MN_COPY_TO_ONDISK) {
                odp->lr_revision = incp->lr_revision;
                odp->lr_flags = incp->lr_flags;
                odp->lr_selfid = incp->lr_selfid;
                odp->lr_class = incp->lr_class;
                odp->lr_msglen = incp->lr_msglen;
                if (incp->lr_msglen)
                        copy_msg_2(&incp->lr_msg, &odp->lr_od_msg, direction);
        } else {
                incp->lr_revision = odp->lr_revision;
                incp->lr_flags = odp->lr_flags;
                incp->lr_selfid = odp->lr_selfid;
                incp->lr_class = odp->lr_class;
                incp->lr_msglen = odp->lr_msglen;
                if (odp->lr_msglen)
                        copy_msg_2(&incp->lr_msg, &odp->lr_od_msg, direction);
        }
}

/*
 * mdmn_allocate_changelog
 *
 * Changelog records are allocated on a per multi-node basis.
 * This routine is called during MN set creation.
 * It pre-allocates the changelog, as user records
 * one per message class plus some spares.
 * Once the records are allocated they are never freed until
 * the mddb is deleted. The preallocation ensures that all nodes
 * will have a consistent view of the mddb.
 *
 * Each record is large enough to hold a maximum sized message
 * Return Values:
 *      0 - success
 *      -1 - fail
 */
int
mdmn_allocate_changelog(mdsetname_t *sp, md_error_t *ep)
{
        mddb_userreq_t          req;
        md_set_desc             *sd;
        mdmn_changelog_record_t *tlr;
        int                     i;
        set_t                   setno;

        /* Get a pointer to the incore md_set_desc for this MN set */
        if ((sd = metaget_setdesc(sp, ep)) == NULL)
                return (-1);
        setno = sd->sd_setno;
        /*
         * Round up the number of changelog records
         * to the next value of MDMN_LOGRECS_QUANTA
         *
         * In all cases, make sure we have at least
         * four more entries than the number of classes
         * in order to provide space for live upgrades that
         * might add classes.
         */

        mdmn_logrecs += (MDMN_LOGRECS_TRIMUP) ? MDMN_LOGRECS_QUANTA : 0;

        mdmn_changelog[setno] = Zalloc(MDMN_LOGHDR_SIZE * mdmn_logrecs);

        for (i = 0; i < mdmn_logrecs; i++) {
                (void) memset(&req, 0, sizeof (req));
                METAD_SETUP_LR(MD_DB_CREATE, setno,  0);
                /* grab a record big enough for max message size */
                req.ur_size = MDMN_LOGRECSIZE_OD;

                if (metaioctl(MD_MN_DB_USERREQ, &req, &req.ur_mde, NULL) != 0) {
                        (void) mdstealerror(ep, &req.ur_mde);
#ifdef DEBUG
                        syslog(LOG_DEBUG, "allocate_log: %s\n",
                            mde_sperror(ep, ""));
#endif
                        Free(mdmn_changelog[setno]);
                        return (-1);
                }

                tlr = &mdmn_changelog[setno][i];
                tlr->lr_selfid = req.ur_recid;
                tlr->lr_revision = MD_MN_CHANGELOG_RECORD_REVISION;
                tlr->lr_class = i;
        }

        /* commit class, and selfid */
        (void) mdmn_commitlog(sd, ep);
        Free(mdmn_changelog[setno]);
        return (0);
}

/*
 * mdmn_reset_changelog
 *
 * Called during reconfig step 2.
 * The only time the changelog is reset is when all nodes in a cluster
 * are starting up. In this case changelog must be ignored, therefore
 * it is reset.
 *
 * The function frees the incore data structures and zeros out the
 * records. The ondisk records are never freed.
 *
 * Return Values:
 *      0 - success
 *      -1 - fail
 */
int
mdmn_reset_changelog(mdsetname_t *sp, md_error_t *ep, int flag)
{
        md_set_desc             *sd;
        mdmn_changelog_record_t *lr;
        set_t                   setno;
        int                     lrc;

        /* Get a pointer to the incore md_set_desc this MN set */
        if ((sd = metaget_setdesc(sp, ep)) == NULL)
                return (-1);

        setno = sd->sd_setno;

        if (mdmn_snarf_changelog(setno, ep) == 0) {
                return (0);
        }

        if (flag & MDMN_CLF_RESETLOG) {
                for (lrc = 0; lrc < mdmn_logrecs; lrc++) {
                        lr = &mdmn_changelog[setno][lrc];
                        Free(lr->lr_msg.msg_event_data);
                        (void) memset(&lr->lr_msg, 0, sizeof (md_mn_msg_t));
                        lr->lr_msglen = 0;
                        lr->lr_flags = 0;
                }
                (void) mdmn_commitlog(sd, ep);
#ifdef DEBUG
                syslog(LOG_DEBUG, "reset_changelog: Log reset\n");
#endif
        }
        /* now zap the array */
        if (flag & MDMN_CLF_RESETCACHE) {
#ifdef DEBUG
                syslog(LOG_DEBUG, "reset_changelog: cache reset\n");
#endif
                Free(&mdmn_changelog[setno]);
                mdmn_changelog[setno] = NULL;
                mdmn_changelog_snarfed[setno] = 0;
        }
        return (0);
}

/*
 * Log a given message in the changelog.
 * This function is only executed by the master node
 * Return Values:
 *      MDMNE_NULL:
 *          success, the log slot is free
 *
 *      MDMNE_ACK:
 *          success,
 *          the log slot is occupied with the same msg from a previous try.
 *
 *      MDMNE_CLASS_BUSY:
 *          This means the appropriate slot is occupied with a different
 *          message. In that case the stored message needs being replayed,
 *          while the current message will be rejected with MDMNE_CLASS_BUSY
 *          to the initiator.
 *
 *      MDMNE_LOG_FAIL:
 *          Bad things happend, cannot continue.
 */
int
mdmn_log_msg(md_mn_msg_t *msg)
{
        set_t           setno;
        md_mn_msgclass_t        class;
        mdmn_changelog_record_t *lr;
        md_error_t              err = mdnullerror;
        md_error_t              *ep = &err;
        int                     retval = 0;

        setno = msg->msg_setno;
        class = mdmn_get_message_class(msg->msg_type);

        /* if not snarfed, snarf it */
        if (mdmn_snarf_changelog(setno, ep) <= 0) {
                syslog(LOG_DAEMON | LOG_ERR, dgettext(TEXT_DOMAIN,
                    "log_msg: No records snarfed\n"));
                return (-1);
        }


        /* log entry for the class */
        lr = &mdmn_changelog[setno][class];

        /* Check if the class is occupied */
        if (lr->lr_flags & MD_MN_LR_INUSE) {
                if (!MSGID_CMP(&(msg->msg_msgid), &(lr->lr_msg.msg_msgid))) {
                        syslog(LOG_DAEMON | LOG_DEBUG, dgettext(TEXT_DOMAIN,
                            "log_msg: id mismatch:\n"
                            " stored    : ID = (%d, 0x%llx-%d)"
                            " setno %d class %d type %d\n"
                            " msg to log: ID = (%d, 0x%llx-%d)"
                            " setno %d class %d type %d.\n"),
                            MSGID_ELEMS(lr->lr_msg.msg_msgid), lr->lr_setno,
                            lr->lr_class, lr->lr_msgtype,
                            MSGID_ELEMS(msg->msg_msgid), msg->msg_setno, class,
                            msg->msg_type);
                        return (MDMNE_CLASS_BUSY);
                } else {
                        syslog(LOG_DAEMON | LOG_DEBUG, dgettext(TEXT_DOMAIN,
                            "log_msg: msgid already logged:\n ID = "
                            " (%d, 0x%llx-%d) setno %d class %d type %d\n"),
                            MSGID_ELEMS(lr->lr_msg.msg_msgid), lr->lr_setno,
                            lr->lr_class, lr->lr_msgtype);
                        return (MDMNE_ACK);
                }
        }

        lr->lr_flags |= MD_MN_LR_INUSE;
        lr->lr_msglen = MD_MN_MSG_LEN(msg);
        assert(lr->lr_msg.msg_event_data == NULL);
        if (msg->msg_event_size)
                lr->lr_msg.msg_event_data = Zalloc(msg->msg_event_size);
        (void) copy_msg(msg, &(lr->lr_msg));
        retval = mdmn_log_it(setno, ep, lr);
        if (retval != 0) {
                syslog(LOG_DAEMON | LOG_ERR, dgettext(TEXT_DOMAIN,
                    "mdmn_log_msg - failure committing logged msg to disk\n"));
                return (MDMNE_LOG_FAIL);
        }

        return (MDMNE_NULL); /* this is good */
}

/*
 * mdmn_unlog_msg(md_mn_msg_t *)
 *
 * Clear the log entry holding the indicated message.
 * Only the set master can do this.
 *
 * Return Values:
 *      0 - success
 *      -1 - fail
 */
int
mdmn_unlog_msg(md_mn_msg_t *msg)
{
        set_t                   setno;
        md_mn_msgclass_t        class;
        md_error_t              err = mdnullerror;
        md_error_t              *ep = &err;
        int                     retval = 0;
        mdmn_changelog_record_t *lr = NULL;

        setno = msg->msg_setno;
        class = mdmn_get_message_class(msg->msg_type);

        /* Find the log entry holding the indicated message */
        if (mdmn_snarf_changelog(setno, ep) == 0)
                return (-1);

        lr = &mdmn_changelog[setno][class];

        /* assert the message is still logged */
        assert(lr != NULL);
        if (!MSGID_CMP(&(msg->msg_msgid), &(lr->lr_msg.msg_msgid))) {
                syslog(LOG_ERR, dgettext(TEXT_DOMAIN,
                    "unlog_msg: msgid mismatch\n"
                    "\t\tstored: ID = (%d, 0x%llx-%d) setno %d "
                    "class %d type %d\n"
                    "\t\tattempting to unlog:\n"
                    "\t\tID = (%d, 0x%llx-%d) setno %d class %d type %d.\n"),
                    MSGID_ELEMS(lr->lr_msg.msg_msgid), lr->lr_setno,
                    lr->lr_class, lr->lr_msgtype, MSGID_ELEMS(msg->msg_msgid),
                    msg->msg_setno, class, msg->msg_type);
                return (-1);
        }
        lr->lr_msglen = 0;
        lr->lr_flags &= ~(MD_MN_LR_INUSE);
        if (lr->lr_msg.msg_event_data) {
                Free(lr->lr_msg.msg_event_data);
                lr->lr_msg.msg_event_data = NULL;
        }
        /* commit the updated log record to disk */
        retval = mdmn_log_it(setno, ep, lr);
#ifdef DEBUG
        dump_rec("mdmn_unlog_msg: ", lr);
#endif
        return (retval);
}


/*
 * mdmn_get_changelogrec(set_t , md_mn_msgclass_t)
 * Returns a pointer to incore changelog record.
 *
 * Return Values:
 *      non-NULL - success
 *      NULL - fail
 */
mdmn_changelog_record_t *
mdmn_get_changelogrec(set_t setno, md_mn_msgclass_t class)
{
        md_error_t      err = mdnullerror;

        if (mdmn_snarf_changelog(setno, &err) == 0)
                return (NULL);
        assert(mdmn_changelog[setno] != NULL);

        return (&mdmn_changelog[setno][class]);
}

/*
 * mdmn_commitlog(md_set_desc *, md_error_t *)
 *
 * Commit the set record and all of the changelog entry records to disk.
 * Don't bother with other stuff hanging off the set record
 * (e.g. drive records) since none of that is changing.
 * Called only at changelog pre-allocation time or when flushing a log.
 *
 * Return Values:
 *      0 - success
 *      errno - fail
 */

static int
mdmn_commitlog(md_set_desc *sd, md_error_t *ep)
{
        int                     lrc;
        int                     *recs;
        uint_t                  size;
        mdmn_changelog_record_t *lr;
        mdmn_changelog_record_od_t clodrec; /* changelog ondisk record */
        mddb_userreq_t          req;
        int                     retval = 0;
        set_t                   setno;

        /* Check for master and bounce non-master requests */
        if (!(MD_MNSET_DESC(sd)) || !sd->sd_mn_am_i_master) {
                if (!(MD_MNSET_DESC(sd))) {
                        syslog(LOG_DAEMON | LOG_ERR, dgettext(TEXT_DOMAIN,
                            "mdmn_commitlog - Not MN Set\n"));
                } else {
                        syslog(LOG_DAEMON | LOG_ERR, dgettext(TEXT_DOMAIN,
                            "mdmn_commit_log - Not Master\n"));
                }
                return (-1);
        }
        (void) memset(&req, 0, sizeof (req));
        /* create the records to commit the info to the mddb */

        size = (mdmn_logrecs + 1) * sizeof (int);
        recs = Zalloc(size);
        /* Initialize the log entry records for update */
        setno = sd->sd_setno;

        for (lrc = 0; lrc < mdmn_logrecs; lrc++) {
                lr = &mdmn_changelog[setno][lrc];
                recs[lrc] = lr->lr_selfid;
                copy_changelog(lr, &clodrec, MD_MN_COPY_TO_ONDISK);
                METAD_SETUP_LR(MD_DB_SETDATA, setno, lr->lr_selfid);
                req.ur_size  = MDMN_LOGRECSIZE_OD;
                req.ur_data = (uintptr_t)&clodrec;
                if ((retval = metaioctl(MD_MN_DB_USERREQ, &req, &req.ur_mde,
                    NULL)) != 0) {
                        (void) mdstealerror(ep, &req.ur_mde);
#ifdef DEBUG
                        syslog(LOG_DAEMON|LOG_DEBUG,
                            "mdmn_commitlog - metaioctl SETDATA failure\n%s",
                            mde_sperror(ep, ""));
#endif
                        break;
                }
        }

        if (retval == 0) {
                /* set last rec to be 0 to indicate completion */
                recs[lrc] = 0;
                /* Commit to mddb  on disk */
                METAD_SETUP_LR(MD_DB_COMMIT_MANY, setno,
                    mdmn_changelog[setno][0].lr_selfid);
                req.ur_size = size;
                req.ur_data = (uintptr_t)recs;
                if ((retval = metaioctl(MD_MN_DB_USERREQ, &req,
                    &req.ur_mde, NULL)) != 0) {
                        (void) mdstealerror(ep, &req.ur_mde);
#ifdef DEBUG
                        syslog(LOG_DAEMON|LOG_DEBUG,
                            "mdmn_commitlog - metaioctl COMMIT_MANY"
                            "Failure\n%s",  mde_sperror(ep, ""));
#endif
                }
        }

        Free(recs);
        return (retval);
}

/*
 * mdmn_log_it(set_t, md_error_t *, mdmn_changelog_record_t *)
 *
 * Commit the changed log record to disk.
 *
 * Return Values:
 *      0 - success
 *      -1 - fail
 */
static int
mdmn_log_it(set_t set, md_error_t *ep, mdmn_changelog_record_t *lr)
{
        int                     *recs;
        uint_t                  size;
        mddb_userreq_t          req;
        mdmn_changelog_record_od_t      clodrec;

        (void) memset(&req, 0, sizeof (req));

        /* Initialize the log entry record for update */

        copy_changelog(lr, &clodrec, MD_MN_COPY_TO_ONDISK);
        METAD_SETUP_LR(MD_DB_SETDATA, set, lr->lr_selfid);
        req.ur_size = MDMN_LOGRECSIZE_OD;
        req.ur_data = (uintptr_t)&clodrec;
        if (metaioctl(MD_MN_DB_USERREQ, &req, &req.ur_mde, NULL) != 0) {
                (void) mdstealerror(ep, &req.ur_mde);
#ifdef DEBUG
                syslog(LOG_DEBUG, "mdmn_log_it: DB_SETDATA  failed\n"
                    "set %d selfid %d, size %d\n%s", set, lr->lr_selfid,
                    req.ur_size, mde_sperror(ep, ""));
#endif
                return (-1);
        }
        /* Set up the recid to be updated */
        size = 2 * sizeof (int); /* the changed record, plus null terminator */
        recs = Zalloc(size);
        recs[0] = lr->lr_selfid;
        recs[1] = 0;
        /* Commit to mddb  on disk */
        METAD_SETUP_LR(MD_DB_COMMIT_ONE, set, lr->lr_selfid);
        req.ur_size = size;
        req.ur_data = (uintptr_t)recs;
        if (metaioctl(MD_MN_DB_USERREQ, &req, &req.ur_mde, NULL) != 0) {
                (void) mdstealerror(ep, &req.ur_mde);
#ifdef DEBUG
                syslog(LOG_DEBUG, "mdmn_log_it: DB_COMMIT_ONE  failed\n"
                    "set %d selfid %d, size %d\n%s", set, lr->lr_selfid,
                    req.ur_size, mde_sperror(ep, ""));
#endif
                Free(recs);
                return (-1);
        }
        Free(recs);
        return (0);
}

/*
 * mdmn_snarf_changelog(set_t, md_error_t *)
 *
 * snarf in the changelog entries and allocate incore structures
 * if required.
 * mdmn_changelog_snarfed array if set to MDMN_CLF_SNARFED, then
 * then the records are already snarfed.
 *
 * Called from set_snarf(), mdmn_log_msg(), and mdmn_unlog_msg()
 * Return Values:
 *      non-zero - success
 *      0 - fail
 */
int
mdmn_snarf_changelog(set_t set, md_error_t *ep)
{
        mdmn_changelog_record_t  *tlr;
        mdmn_changelog_record_od_t       *lr;
        mddb_recid_t            id;
        md_mn_msgclass_t        class;


        if (set == MD_LOCAL_SET)
                return (0);

        id = 0;

        if (mdmn_changelog_snarfed[set] & MDMN_CLF_SNARFED) {
                assert(mdmn_changelog[set] != NULL);
                return (mdmn_logrecs);
        }

        lr = (mdmn_changelog_record_od_t *)get_ur_rec(set, MD_UR_GET_NEXT,
            MDDB_UR_LR, &id, ep);
        if (lr == NULL)
                return (0);

        /* only allocate if Log records exist */

        if (mdmn_changelog[set] == NULL) {
                /* Allocate incore state for the log */
                mdmn_changelog[set] = Zalloc(MDMN_LOGHDR_SIZE *
                    mdmn_logrecs);
        }

        do {
                class = lr->lr_class;
                tlr = &mdmn_changelog[set][class];
                copy_changelog(tlr, lr, MD_MN_COPY_TO_INCORE);
                Free(lr);
                lr = (mdmn_changelog_record_od_t *)get_ur_rec(set,
                    MD_UR_GET_NEXT, MDDB_UR_LR, &id, ep);
        } while (lr != NULL);

        /* Since log records counts are fixed return that value */
        mdmn_changelog_snarfed[set] |= MDMN_CLF_SNARFED;
        return (mdmn_logrecs);
}