lustre_log.h

来自「lustre 1.6.5 source code」· C头文件 代码 · 共 484 行 · 第 1/2 页

/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
 * vim:expandtab:shiftwidth=8:tabstop=8:
 *
 *  Copyright (C) 2001 Cluster File Systems, Inc. <[e-mail]>
 *
 *   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.
 *
 * Generic infrastructure for managing a collection of logs.
 *
 * These logs are used for:
 *
 * - orphan recovery: OST adds record on create
 * - mtime/size consistency: the OST adds a record on first write
 * - open/unlinked objects: OST adds a record on destroy
 *
 * - mds unlink log: the MDS adds an entry upon delete
 *
 * - raid1 replication log between OST's
 * - MDS replication logs
 */

#ifndef _LUSTRE_LOG_H
#define _LUSTRE_LOG_H

#if defined(__linux__)
#include <linux/lustre_log.h>
#elif defined(__APPLE__)
#include <darwin/lustre_log.h>
#elif defined(__WINNT__)
#include <winnt/lustre_log.h>
#else
#error Unsupported operating system.
#endif

#include <obd.h>
#include <obd_ost.h>
#include <lustre/lustre_idl.h>

#define LOG_NAME_LIMIT(logname, name)                   \
        snprintf(logname, sizeof(logname), "LOGS/%s", name)
#define LLOG_EEMPTY 4711

struct plain_handle_data {
        struct list_head    phd_entry;
        struct llog_handle *phd_cat_handle;
        struct llog_cookie  phd_cookie; /* cookie of this log in its cat */
        int                 phd_last_idx;
};

struct cat_handle_data {
        struct list_head        chd_head;
        struct llog_handle     *chd_current_log; /* currently open log */
};

/* In-memory descriptor for a log object or log catalog */
struct llog_handle {
        struct rw_semaphore     lgh_lock;
        struct llog_logid       lgh_id;              /* id of this log */
        struct llog_log_hdr    *lgh_hdr;
        struct file            *lgh_file;
        int                     lgh_last_idx;
        int                     lgh_cur_idx;    /* used during llog_process */
        __u64                   lgh_cur_offset; /* used during llog_process */
        struct llog_ctxt       *lgh_ctxt;
        union {
                struct plain_handle_data phd;
                struct cat_handle_data   chd;
        } u;
};

/* llog.c  -  general API */
typedef int (*llog_cb_t)(struct llog_handle *, struct llog_rec_hdr *, void *);
typedef int (*llog_fill_rec_cb_t)(struct llog_rec_hdr *rec, void *data);
extern struct llog_handle *llog_alloc_handle(void);
int llog_init_handle(struct llog_handle *handle, int flags,
                     struct obd_uuid *uuid);
extern void llog_free_handle(struct llog_handle *handle);
int llog_process(struct llog_handle *loghandle, llog_cb_t cb,
                 void *data, void *catdata);
int llog_reverse_process(struct llog_handle *loghandle, llog_cb_t cb,
                         void *data, void *catdata);
extern int llog_cancel_rec(struct llog_handle *loghandle, int index);
extern int llog_close(struct llog_handle *cathandle);
extern int llog_get_size(struct llog_handle *loghandle);

/* llog_cat.c   -  catalog api */
struct llog_process_data {
        void *lpd_data;
        llog_cb_t lpd_cb;
};

struct llog_process_cat_data {
        int     first_idx;
        int     last_idx;
        /* to process catalog across zero record */
};

int llog_cat_put(struct llog_handle *cathandle);
int llog_cat_add_rec(struct llog_handle *cathandle, struct llog_rec_hdr *rec,
                     struct llog_cookie *reccookie, void *buf);
int llog_cat_cancel_records(struct llog_handle *cathandle, int count,
                            struct llog_cookie *cookies);
int llog_cat_process(struct llog_handle *cat_llh, llog_cb_t cb, void *data);
int llog_cat_reverse_process(struct llog_handle *cat_llh, llog_cb_t cb, void *data);
int llog_cat_set_first_idx(struct llog_handle *cathandle, int index);

/* llog_obd.c */
int llog_setup(struct obd_device *obd, int index, struct obd_device *disk_obd,
               int count,  struct llog_logid *logid,struct llog_operations *op);
int __llog_ctxt_put(struct llog_ctxt *ctxt);
int llog_cleanup(struct llog_ctxt *);
int llog_sync(struct llog_ctxt *ctxt, struct obd_export *exp);
int llog_add(struct llog_ctxt *ctxt, struct llog_rec_hdr *rec,
             struct lov_stripe_md *lsm, struct llog_cookie *logcookies,
             int numcookies);
int llog_cancel(struct llog_ctxt *, struct lov_stripe_md *lsm,
                int count, struct llog_cookie *cookies, int flags);

int llog_obd_origin_setup(struct obd_device *obd, int index,
                          struct obd_device *disk_obd, int count,
                          struct llog_logid *logid);
int llog_obd_origin_cleanup(struct llog_ctxt *ctxt);
int llog_obd_origin_add(struct llog_ctxt *ctxt,
                        struct llog_rec_hdr *rec, struct lov_stripe_md *lsm,
                        struct llog_cookie *logcookies, int numcookies);

int llog_cat_initialize(struct obd_device *obd, int count, 
                        struct obd_uuid *uuid);
int obd_llog_init(struct obd_device *obd, struct obd_device *disk_obd,
                  int count, struct llog_catid *logid, struct obd_uuid *uuid);

int obd_llog_finish(struct obd_device *obd, int count);

/* llog_ioctl.c */
int llog_ioctl(struct llog_ctxt *ctxt, int cmd, struct obd_ioctl_data *data);
int llog_catalog_list(struct obd_device *obd, int count,
                      struct obd_ioctl_data *data);

/* llog_net.c */
int llog_initiator_connect(struct llog_ctxt *ctxt);
int llog_receptor_accept(struct llog_ctxt *ctxt, struct obd_import *imp);
int llog_origin_connect(struct llog_ctxt *ctxt, int count,
                        struct llog_logid *logid, struct llog_gen *gen,
                        struct obd_uuid *uuid);
int llog_handle_connect(struct ptlrpc_request *req);

/* recov_thread.c */
int llog_obd_repl_cancel(struct llog_ctxt *ctxt,
                         struct lov_stripe_md *lsm, int count,
                         struct llog_cookie *cookies, int flags);
int llog_obd_repl_sync(struct llog_ctxt *ctxt, struct obd_export *exp);
int llog_repl_connect(struct llog_ctxt *ctxt, int count,
                      struct llog_logid *logid, struct llog_gen *gen,
                      struct obd_uuid *uuid);

struct llog_operations {
        int (*lop_write_rec)(struct llog_handle *loghandle,
                             struct llog_rec_hdr *rec,
                             struct llog_cookie *logcookies, int numcookies,
                             void *, int idx);
        int (*lop_destroy)(struct llog_handle *handle);
        int (*lop_next_block)(struct llog_handle *h, int *curr_idx,
                              int next_idx, __u64 *offset, void *buf, int len);
        int (*lop_prev_block)(struct llog_handle *h,
                              int prev_idx, void *buf, int len);
        int (*lop_create)(struct llog_ctxt *ctxt, struct llog_handle **,
                          struct llog_logid *logid, char *name);
        int (*lop_close)(struct llog_handle *handle);
        int (*lop_read_header)(struct llog_handle *handle);

        int (*lop_setup)(struct obd_device *obd, int ctxt_idx,
                         struct obd_device *disk_obd, int count,
                         struct llog_logid *logid);
        int (*lop_sync)(struct llog_ctxt *ctxt, struct obd_export *exp);
        int (*lop_cleanup)(struct llog_ctxt *ctxt);
        int (*lop_add)(struct llog_ctxt *ctxt, struct llog_rec_hdr *rec,
                       struct lov_stripe_md *lsm,
                       struct llog_cookie *logcookies, int numcookies);
        int (*lop_cancel)(struct llog_ctxt *ctxt, struct lov_stripe_md *lsm,
                          int count, struct llog_cookie *cookies, int flags);
        int (*lop_connect)(struct llog_ctxt *ctxt, int count,
                           struct llog_logid *logid, struct llog_gen *gen,
                           struct obd_uuid *uuid);
        /* XXX add 2 more: commit callbacks and llog recovery functions */
};

/* llog_lvfs.c */
extern struct llog_operations llog_lvfs_ops;
int llog_get_cat_list(struct obd_device *obd, struct obd_device *disk_obd,
                      char *name, int count, struct llog_catid *idarray);

struct llog_ctxt {
        int                      loc_idx; /* my index the obd array of ctxt's */
        struct llog_gen          loc_gen;
        struct obd_device       *loc_obd; /* points back to the containing obd*/
        struct obd_export       *loc_exp; /* parent "disk" export (e.g. MDS) */
        struct obd_import       *loc_imp; /* to use in RPC's: can be backward
                                             pointing import */
        struct llog_operations  *loc_logops;
        struct llog_handle      *loc_handle;
        struct llog_canceld_ctxt *loc_llcd;
        struct semaphore         loc_sem; /* protects loc_llcd and loc_imp */
        atomic_t                 loc_refcount;
        struct llog_commit_master *loc_lcm;
        void                    *llog_proc_cb;
};

#ifndef __KERNEL__

#define cap_raise(c, flag) do {} while(0)

#define CAP_SYS_RESOURCE 24

#endif   /* !__KERNEL__ */

static inline void llog_gen_init(struct llog_ctxt *ctxt)
{
        struct obd_device *obd = ctxt->loc_exp->exp_obd;

        if (!strcmp(obd->obd_type->typ_name, LUSTRE_MDS_NAME))
                ctxt->loc_gen.mnt_cnt = obd->u.mds.mds_mount_count;
        else if (!strstr(obd->obd_type->typ_name, LUSTRE_OST_NAME))
                ctxt->loc_gen.mnt_cnt = obd->u.filter.fo_mount_count;
        else
                ctxt->loc_gen.mnt_cnt = 0;
}

static inline int llog_gen_lt(struct llog_gen a, struct llog_gen b)
{