llog_server.c

来自「lustre 1.6.5 source code」· C语言 代码 · 共 717 行 · 第 1/2 页

/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
 * vim:expandtab:shiftwidth=8:tabstop=8:
 *
 *  Copyright (C) 2001-2003 Cluster File Systems, Inc.
 *   Author: Andreas Dilger <[e-mail]>
 *
 *   This file is part of the Lustre file system, http://www.lustre.org
 *   Lustre is a trademark of Cluster File Systems, Inc.
 *
 *   You may have signed or agreed to another license before downloading
 *   this software.  If so, you are bound by the terms and conditions
 *   of that agreement, and the following does not apply to you.  See the
 *   LICENSE file included with this distribution for more information.
 *
 *   If you did not agree to a different license, then this copy of Lustre
 *   is open source 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.
 *
 *   In either case, 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
 *   license text for more details.
 *
 *  remote api for llog - server side
 *
 */

#define DEBUG_SUBSYSTEM S_LOG

#ifndef EXPORT_SYMTAB
#define EXPORT_SYMTAB
#endif

#ifndef __KERNEL__
#include <liblustre.h>
#endif

#include <obd_class.h>
#include <lustre_log.h>
#include <lustre_net.h>
#include <libcfs/list.h>
#include <lustre_fsfilt.h>

#if defined(__KERNEL__) && defined(LUSTRE_LOG_SERVER)

int llog_origin_handle_create(struct ptlrpc_request *req)
{
        struct obd_export *exp = req->rq_export;
        struct obd_device *obd = exp->exp_obd;
        struct obd_device *disk_obd;
        struct llog_handle  *loghandle;
        struct llogd_body *body;
        struct lvfs_run_ctxt saved;
        struct llog_logid *logid = NULL;
        struct llog_ctxt *ctxt;
        char * name = NULL;
        int size[2] = { sizeof(struct ptlrpc_body), sizeof(*body) };
        int rc, rc2;
        ENTRY;

        body = lustre_swab_reqbuf(req, REQ_REC_OFF, sizeof(*body),
                                 lustre_swab_llogd_body);
        if (body == NULL) {
                CERROR ("Can't unpack llogd_body\n");
                RETURN(-EFAULT);
        }

        if (body->lgd_logid.lgl_oid > 0)
                logid = &body->lgd_logid;

        if (lustre_msg_bufcount(req->rq_reqmsg) > 2) {
                name = lustre_msg_string(req->rq_reqmsg, REQ_REC_OFF + 1, 0);
                if (name == NULL) {
                        CERROR("Can't unpack name\n");
                        RETURN(-EFAULT);
                }
                CDEBUG(D_INFO, "opening log %s\n", name);
        }

        ctxt = llog_get_context(obd, body->lgd_ctxt_idx);
        if (ctxt == NULL)
                RETURN(-EINVAL);
        disk_obd = ctxt->loc_exp->exp_obd;
        push_ctxt(&saved, &disk_obd->obd_lvfs_ctxt, NULL);

        rc = llog_create(ctxt, &loghandle, logid, name);
        if (rc)
                GOTO(out_pop, rc);

        rc = lustre_pack_reply(req, 2, size, NULL);
        if (rc)
                GOTO(out_close, rc = -ENOMEM);

        body = lustre_msg_buf(req->rq_repmsg, REPLY_REC_OFF, sizeof(*body));
        body->lgd_logid = loghandle->lgh_id;

out_close:
        rc2 = llog_close(loghandle);
        if (!rc)
                rc = rc2;
out_pop:
        pop_ctxt(&saved, &disk_obd->obd_lvfs_ctxt, NULL);
        llog_ctxt_put(ctxt);
        RETURN(rc);
}

int llog_origin_handle_destroy(struct ptlrpc_request *req)
{
        struct obd_export *exp = req->rq_export;
        struct obd_device *obd = exp->exp_obd;
        struct obd_device *disk_obd;
        struct llog_handle  *loghandle;
        struct llogd_body *body;
        struct lvfs_run_ctxt saved;
        struct llog_logid *logid = NULL;
        struct llog_ctxt *ctxt;
        int size[] = { sizeof(struct ptlrpc_body), sizeof(*body) };
        int rc;
        __u32 flags;
        ENTRY;

        body = lustre_swab_reqbuf(req, REQ_REC_OFF, sizeof(*body),
                                 lustre_swab_llogd_body);
        if (body == NULL) {
                CERROR ("Can't unpack llogd_body\n");
                RETURN(-EFAULT);
        }

        if (body->lgd_logid.lgl_oid > 0)
                logid = &body->lgd_logid;

        ctxt = llog_get_context(obd, body->lgd_ctxt_idx);
        if (ctxt == NULL)
                RETURN(-EINVAL);

        disk_obd = ctxt->loc_exp->exp_obd;
        push_ctxt(&saved, &disk_obd->obd_lvfs_ctxt, NULL);

        rc = llog_create(ctxt, &loghandle, logid, NULL);
        if (rc)
                GOTO(out_pop, rc);

        rc = lustre_pack_reply(req, 2, size, NULL);
        if (rc)
                GOTO(out_close, rc = -ENOMEM);

        body = lustre_msg_buf(req->rq_repmsg, REPLY_REC_OFF, sizeof (*body));
        body->lgd_logid = loghandle->lgh_id;
        flags = body->lgd_llh_flags;
        rc = llog_init_handle(loghandle, LLOG_F_IS_PLAIN, NULL);
        if (rc)
                GOTO(out_close, rc);
        rc = llog_destroy(loghandle);
        if (rc)
                GOTO(out_close, rc);
        llog_free_handle(loghandle);

out_close:
        if (rc)
                llog_close(loghandle);
out_pop:
        pop_ctxt(&saved, &disk_obd->obd_lvfs_ctxt, NULL);
        llog_ctxt_put(ctxt);
        RETURN(rc);
}

int llog_origin_handle_next_block(struct ptlrpc_request *req)
{
        struct obd_export *exp = req->rq_export;
        struct obd_device *obd = exp->exp_obd;
        struct obd_device *disk_obd;
        struct llog_handle  *loghandle;
        struct llogd_body *body;
        struct lvfs_run_ctxt saved;
        struct llog_ctxt *ctxt;
        __u32 flags;
        __u8 *buf;
        void * ptr;
        int size[3] = { sizeof(struct ptlrpc_body),
                        sizeof(*body),
                        LLOG_CHUNK_SIZE };
        int rc, rc2;
        ENTRY;

        body = lustre_swab_reqbuf(req, REQ_REC_OFF, sizeof(*body),
                                  lustre_swab_llogd_body);
        if (body == NULL) {
                CERROR ("Can't unpack llogd_body\n");
                RETURN(-EFAULT);
        }

        OBD_ALLOC(buf, LLOG_CHUNK_SIZE);
        if (!buf)
                RETURN(-ENOMEM);

        ctxt = llog_get_context(obd, body->lgd_ctxt_idx);
        if (ctxt == NULL)
                GOTO(out_free, rc = -EINVAL);
        disk_obd = ctxt->loc_exp->exp_obd;
        push_ctxt(&saved, &disk_obd->obd_lvfs_ctxt, NULL);

        rc = llog_create(ctxt, &loghandle, &body->lgd_logid, NULL);
        if (rc)
                GOTO(out_pop, rc);

        flags = body->lgd_llh_flags;
        rc = llog_init_handle(loghandle, flags, NULL);
        if (rc)
                GOTO(out_close, rc);

        memset(buf, 0, LLOG_CHUNK_SIZE);
        rc = llog_next_block(loghandle, &body->lgd_saved_index,
                             body->lgd_index,
                             &body->lgd_cur_offset, buf, LLOG_CHUNK_SIZE);
        if (rc)
                GOTO(out_close, rc);


        rc = lustre_pack_reply(req, 3, size, NULL);
        if (rc)
                GOTO(out_close, rc = -ENOMEM);

        ptr = lustre_msg_buf(req->rq_repmsg, REPLY_REC_OFF, sizeof (body));
        memcpy(ptr, body, sizeof(*body));

        ptr = lustre_msg_buf(req->rq_repmsg, REPLY_REC_OFF+1, LLOG_CHUNK_SIZE);
        memcpy(ptr, buf, LLOG_CHUNK_SIZE);

out_close:
        rc2 = llog_close(loghandle);
        if (!rc)
                rc = rc2;

out_pop:
        pop_ctxt(&saved, &disk_obd->obd_lvfs_ctxt, NULL);
        llog_ctxt_put(ctxt);
out_free:
        OBD_FREE(buf, LLOG_CHUNK_SIZE);
        RETURN(rc);
}

int llog_origin_handle_prev_block(struct ptlrpc_request *req)
{
        struct obd_export *exp = req->rq_export;
        struct obd_device *obd = exp->exp_obd;
        struct llog_handle  *loghandle;
        struct llogd_body *body;
        struct obd_device *disk_obd;
        struct lvfs_run_ctxt saved;
        struct llog_ctxt *ctxt;
        __u32 flags;
        __u8 *buf;
        void * ptr;
        int size[] = { sizeof(struct ptlrpc_body),
                       sizeof(*body),
                       LLOG_CHUNK_SIZE };
        int rc, rc2;
        ENTRY;

        body = lustre_swab_reqbuf(req, REQ_REC_OFF, sizeof(*body),
                                  lustre_swab_llogd_body);
        if (body == NULL) {
                CERROR ("Can't unpack llogd_body\n");
                RETURN(-EFAULT);
        }

        OBD_ALLOC(buf, LLOG_CHUNK_SIZE);
        if (!buf)
                RETURN(-ENOMEM);

        ctxt = llog_get_context(obd, body->lgd_ctxt_idx);
        LASSERT(ctxt != NULL);
        disk_obd = ctxt->loc_exp->exp_obd;
        push_ctxt(&saved, &disk_obd->obd_lvfs_ctxt, NULL);

        rc = llog_create(ctxt, &loghandle, &body->lgd_logid, NULL);
        if (rc)
                GOTO(out_pop, rc);

        flags = body->lgd_llh_flags;
        rc = llog_init_handle(loghandle, flags, NULL);
        if (rc)
                GOTO(out_close, rc);

        memset(buf, 0, LLOG_CHUNK_SIZE);
        rc = llog_prev_block(loghandle, body->lgd_index,
                             buf, LLOG_CHUNK_SIZE);
        if (rc)
                GOTO(out_close, rc);

        rc = lustre_pack_reply(req, 3, size, NULL);
        if (rc)
                GOTO(out_close, rc = -ENOMEM);

        ptr = lustre_msg_buf(req->rq_repmsg, REPLY_REC_OFF, sizeof(body));
        memcpy(ptr, body, sizeof(*body));

        ptr = lustre_msg_buf(req->rq_repmsg, REPLY_REC_OFF+1, LLOG_CHUNK_SIZE);
        memcpy(ptr, buf, LLOG_CHUNK_SIZE);

out_close:
        rc2 = llog_close(loghandle);
        if (!rc)
                rc = rc2;

out_pop:
        pop_ctxt(&saved, &disk_obd->obd_lvfs_ctxt, NULL);
        llog_ctxt_put(ctxt);
        OBD_FREE(buf, LLOG_CHUNK_SIZE);
        RETURN(rc);
}

int llog_origin_handle_read_header(struct ptlrpc_request *req)
{
        struct obd_export *exp = req->rq_export;
        struct obd_device *obd = exp->exp_obd;
        struct obd_device *disk_obd;
        struct llog_handle  *loghandle;
        struct llogd_body *body;
        struct llog_log_hdr *hdr;
        struct lvfs_run_ctxt saved;
        struct llog_ctxt *ctxt;
        __u32 flags;
        int size[2] = { sizeof(struct ptlrpc_body), sizeof(*hdr) };
        int rc, rc2;
        ENTRY;

        body = lustre_swab_reqbuf(req, REQ_REC_OFF, sizeof(*body),
                                  lustre_swab_llogd_body);
        if (body == NULL) {
                CERROR ("Can't unpack llogd_body\n");
                RETURN(-EFAULT);
        }

        ctxt = llog_get_context(obd, body->lgd_ctxt_idx);
        if (ctxt == NULL)
                RETURN(-EINVAL);
        disk_obd = ctxt->loc_exp->exp_obd;
        push_ctxt(&saved, &disk_obd->obd_lvfs_ctxt, NULL);

        rc = llog_create(ctxt, &loghandle, &body->lgd_logid, NULL);
        if (rc)
                GOTO(out_pop, rc);

        /* init_handle reads the header */
        flags = body->lgd_llh_flags;
        rc = llog_init_handle(loghandle, flags, NULL);
        if (rc)
                GOTO(out_close, rc);

        rc = lustre_pack_reply(req, 2, size, NULL);
        if (rc)
                GOTO(out_close, rc = -ENOMEM);

        hdr = lustre_msg_buf(req->rq_repmsg, REPLY_REC_OFF, sizeof(*hdr));
        memcpy(hdr, loghandle->lgh_hdr, sizeof(*hdr));

out_close: