llog_cat.c

lustre 1.6.5 source code

        /* loghandle is already locked by llog_cat_current_log() for us */
        rc = llog_write_rec(loghandle, rec, reccookie, 1, buf, -1);
        up_write(&loghandle->lgh_lock);
        if (rc == -ENOSPC) {
                /* to create a new plain log */
                loghandle = llog_cat_current_log(cathandle, 1);
                if (IS_ERR(loghandle))
                        RETURN(PTR_ERR(loghandle));
                rc = llog_write_rec(loghandle, rec, reccookie, 1, buf, -1);
                up_write(&loghandle->lgh_lock);
        }

        RETURN(rc);
}
EXPORT_SYMBOL(llog_cat_add_rec);

/* For each cookie in the cookie array, we clear the log in-use bit and either:
 * - the log is empty, so mark it free in the catalog header and delete it
 * - the log is not empty, just write out the log header
 *
 * The cookies may be in different log files, so we need to get new logs
 * each time.
 *
 * Assumes caller has already pushed us into the kernel context.
 */
int llog_cat_cancel_records(struct llog_handle *cathandle, int count,
                        struct llog_cookie *cookies)
{
        int i, index, rc = 0;
        ENTRY;

        down_write(&cathandle->lgh_lock);
        for (i = 0; i < count; i++, cookies++) {
                struct llog_handle *loghandle;
                struct llog_logid *lgl = &cookies->lgc_lgl;

                rc = llog_cat_id2handle(cathandle, &loghandle, lgl);
                if (rc) {
                        CERROR("Cannot find log "LPX64"\n", lgl->lgl_oid);
                        break;
                }

                down_write(&loghandle->lgh_lock);
                rc = llog_cancel_rec(loghandle, cookies->lgc_index);
                up_write(&loghandle->lgh_lock);

                if (rc == 1) {          /* log has been destroyed */
                        index = loghandle->u.phd.phd_cookie.lgc_index;
                        if (cathandle->u.chd.chd_current_log == loghandle)
                                cathandle->u.chd.chd_current_log = NULL;
                        llog_free_handle(loghandle);

                        LASSERT(index);
                        llog_cat_set_first_idx(cathandle, index);
                        rc = llog_cancel_rec(cathandle, index);
                        if (rc == 0)
                                CDEBUG(D_RPCTRACE,"cancel plain log at index %u"
                                       " of catalog "LPX64"\n",
                                       index, cathandle->lgh_id.lgl_oid);
                }
        }
        up_write(&cathandle->lgh_lock);

        RETURN(rc);
}
EXPORT_SYMBOL(llog_cat_cancel_records);

int llog_cat_process_cb(struct llog_handle *cat_llh, struct llog_rec_hdr *rec,
                        void *data)
{
        struct llog_process_data *d = data;
        struct llog_logid_rec *lir = (struct llog_logid_rec *)rec;
        struct llog_handle *llh;
        int rc;

        ENTRY;
        if (rec->lrh_type != LLOG_LOGID_MAGIC) {
                CERROR("invalid record in catalog\n");
                RETURN(-EINVAL);
        }
        CDEBUG(D_HA, "processing log "LPX64":%x at index %u of catalog "
               LPX64"\n", lir->lid_id.lgl_oid, lir->lid_id.lgl_ogen,
               rec->lrh_index, cat_llh->lgh_id.lgl_oid);

        rc = llog_cat_id2handle(cat_llh, &llh, &lir->lid_id);
        if (rc) {
                CERROR("Cannot find handle for log "LPX64"\n",
                       lir->lid_id.lgl_oid);
                RETURN(rc);
        }

        rc = llog_process(llh, d->lpd_cb, d->lpd_data, NULL);
        RETURN(rc);
}

int llog_cat_process(struct llog_handle *cat_llh, llog_cb_t cb, void *data)
{
        struct llog_process_data d;
        struct llog_process_cat_data cd;
        struct llog_log_hdr *llh = cat_llh->lgh_hdr;
        int rc;
        ENTRY;

        LASSERT(llh->llh_flags & LLOG_F_IS_CAT);
        d.lpd_data = data;
        d.lpd_cb = cb;

        if (llh->llh_cat_idx > cat_llh->lgh_last_idx) {
                CWARN("catlog "LPX64" crosses index zero\n",
                      cat_llh->lgh_id.lgl_oid);

                cd.first_idx = llh->llh_cat_idx;
                cd.last_idx = 0;
                rc = llog_process(cat_llh, llog_cat_process_cb, &d, &cd);
                if (rc != 0)
                        RETURN(rc);

                cd.first_idx = 0;
                cd.last_idx = cat_llh->lgh_last_idx;
                rc = llog_process(cat_llh, llog_cat_process_cb, &d, &cd);
        } else {
                rc = llog_process(cat_llh, llog_cat_process_cb, &d, NULL);
        }

        RETURN(rc);
}
EXPORT_SYMBOL(llog_cat_process);

static int llog_cat_reverse_process_cb(struct llog_handle *cat_llh,
                                       struct llog_rec_hdr *rec, void *data)
{
        struct llog_process_data *d = data;
        struct llog_logid_rec *lir = (struct llog_logid_rec *)rec;
        struct llog_handle *llh;
        int rc;

        if (le32_to_cpu(rec->lrh_type) != LLOG_LOGID_MAGIC) {
                CERROR("invalid record in catalog\n");
                RETURN(-EINVAL);
        }
        CDEBUG(D_HA, "processing log "LPX64":%x at index %u of catalog "
               LPX64"\n", lir->lid_id.lgl_oid, lir->lid_id.lgl_ogen,
               le32_to_cpu(rec->lrh_index), cat_llh->lgh_id.lgl_oid);

        rc = llog_cat_id2handle(cat_llh, &llh, &lir->lid_id);
        if (rc) {
                CERROR("Cannot find handle for log "LPX64"\n",
                       lir->lid_id.lgl_oid);
                RETURN(rc);
        }

        rc = llog_reverse_process(llh, d->lpd_cb, d->lpd_data, NULL);
        RETURN(rc);
}

int llog_cat_reverse_process(struct llog_handle *cat_llh,
                             llog_cb_t cb, void *data)
{
        struct llog_process_data d;
        struct llog_process_cat_data cd;
        struct llog_log_hdr *llh = cat_llh->lgh_hdr;
        int rc;
        ENTRY;

        LASSERT(llh->llh_flags & LLOG_F_IS_CAT);
        d.lpd_data = data;
        d.lpd_cb = cb;

        if (llh->llh_cat_idx > cat_llh->lgh_last_idx) {
                CWARN("catalog "LPX64" crosses index zero\n",
                      cat_llh->lgh_id.lgl_oid);

                cd.first_idx = 0;
                cd.last_idx = cat_llh->lgh_last_idx;
                rc = llog_reverse_process(cat_llh, llog_cat_reverse_process_cb,
                                          &d, &cd);
                if (rc != 0)
                        RETURN(rc);

                cd.first_idx = le32_to_cpu(llh->llh_cat_idx);
                cd.last_idx = 0;
                rc = llog_reverse_process(cat_llh, llog_cat_reverse_process_cb,
                                          &d, &cd);
        } else {
                rc = llog_reverse_process(cat_llh, llog_cat_reverse_process_cb,
                                          &d, NULL);
        }

        RETURN(rc);
}
EXPORT_SYMBOL(llog_cat_reverse_process);

int llog_cat_set_first_idx(struct llog_handle *cathandle, int index)
{
        struct llog_log_hdr *llh = cathandle->lgh_hdr;
        int i, bitmap_size, idx;
        ENTRY;

        bitmap_size = LLOG_BITMAP_SIZE(llh);
        if (llh->llh_cat_idx == (index - 1)) {
                idx = llh->llh_cat_idx + 1;
                llh->llh_cat_idx = idx;
                if (idx == cathandle->lgh_last_idx)
                        goto out;
                for (i = (index + 1) % bitmap_size;
                     i != cathandle->lgh_last_idx;
                     i = (i + 1) % bitmap_size) {
                        if (!ext2_test_bit(i, llh->llh_bitmap)) {
                                idx = llh->llh_cat_idx + 1;
                                llh->llh_cat_idx = idx;
                        } else if (i == 0) {
                                llh->llh_cat_idx = 0;
                        } else {
                                break;
                        }
                }
out:
                CDEBUG(D_RPCTRACE, "set catlog "LPX64" first idx %u\n",
                       cathandle->lgh_id.lgl_oid, llh->llh_cat_idx);
        }

        RETURN(0);
}

#if 0
/* Assumes caller has already pushed us into the kernel context. */
int llog_cat_init(struct llog_handle *cathandle, struct obd_uuid *tgtuuid)
{
        struct llog_log_hdr *llh;
        loff_t offset = 0;
        int rc = 0;
        ENTRY;

        LASSERT(sizeof(*llh) == LLOG_CHUNK_SIZE);

        down(&cathandle->lgh_lock);
        llh = cathandle->lgh_hdr;

        if (i_size_read(cathandle->lgh_file->f_dentry->d_inode) == 0) {
                llog_write_rec(cathandle, &llh->llh_hdr, NULL, 0, NULL, 0);

write_hdr:
                rc = lustre_fwrite(cathandle->lgh_file, llh, LLOG_CHUNK_SIZE,
                                   &offset);
                if (rc != LLOG_CHUNK_SIZE) {
                        CERROR("error writing catalog header: rc %d\n", rc);
                        OBD_FREE(llh, sizeof(*llh));
                        if (rc >= 0)
                                rc = -ENOSPC;
                } else
                        rc = 0;
        } else {
                rc = lustre_fread(cathandle->lgh_file, llh, LLOG_CHUNK_SIZE,
                                  &offset);
                if (rc != LLOG_CHUNK_SIZE) {
                        CERROR("error reading catalog header: rc %d\n", rc);
                        /* Can we do much else if the header is bad? */
                        goto write_hdr;
                } else
                        rc = 0;
        }

        cathandle->lgh_tgtuuid = &llh->llh_tgtuuid;
        up(&cathandle->lgh_lock);
        RETURN(rc);
}
EXPORT_SYMBOL(llog_cat_init);

#endif