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/*
   Copyright (c) 2010-2011 Gluster, Inc. <http://www.gluster.com>
   This file is part of GlusterFS.

   GlusterFS is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published
   by the Free Software Foundation; either version 3 of the License,
   or (at your option) any later version.

   GlusterFS 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 this program.  If not, see
   <http://www.gnu.org/licenses/>.
*/

#ifndef _CLIENT_H
#define _CLIENT_H

#include <pthread.h>
#include <stdint.h>

#include "rpc-clnt.h"
#include "list.h"
#include "inode.h"
#include "client-mem-types.h"
#include "protocol-common.h"
#include "glusterfs3.h"
#include "fd-lk.h"

/* FIXME: Needs to be defined in a common file */
#define CLIENT_CMD_CONNECT    "trusted.glusterfs.client-connect"
#define CLIENT_CMD_DISCONNECT "trusted.glusterfs.client-disconnect"
#define CLIENT_DUMP_LOCKS     "trusted.glusterfs.clientlk-dump"
#define GF_MAX_SOCKET_WINDOW_SIZE  (1 * GF_UNIT_MB)
#define GF_MIN_SOCKET_WINDOW_SIZE  (0)

#define CLIENT_GET_REMOTE_FD(conf, fd, remote_fd, op_errno, label)      \
        do {                                                            \
                clnt_fd_ctx_t      *fdctx    = NULL;                    \
                pthread_mutex_lock (&conf->lock);                       \
                {                                                       \
                        fdctx = this_fd_get_ctx (fd, THIS);             \
                }                                                       \
                pthread_mutex_unlock (&conf->lock);                     \
                if (!fdctx) {                                           \
                        remote_fd = -2;                                 \
                } else {                                                \
                        remote_fd = fdctx->remote_fd;                   \
                }                                                       \
                if (remote_fd == -1) {                                  \
                        gf_log (THIS->name, GF_LOG_WARNING, " (%s) "    \
                                "remote_fd is -1. EBADFD",              \
                                uuid_utoa (fd->inode->gfid));           \
                        op_errno = EBADFD;                              \
                        goto label;                                     \
                }                                                       \
        } while (0);

struct clnt_options {
        char *remote_subvolume;
        int   ping_timeout;
};

typedef struct clnt_conf {
        struct rpc_clnt       *rpc;
        struct clnt_options    opt;
        struct rpc_clnt_config rpc_conf;
	struct list_head       saved_fds;
        pthread_mutex_t        lock;
        int                    connecting;
        int                    connected;

        rpc_clnt_prog_t       *fops;
        rpc_clnt_prog_t       *mgmt;
        rpc_clnt_prog_t       *handshake;
        rpc_clnt_prog_t       *dump;

        uint64_t               reopen_fd_count; /* Count of fds reopened after a
                                                   connection is established */
        gf_lock_t              rec_lock;
        int                    skip_notify;

        int                    last_sent_event; /* Flag used to make sure we are
                                                   not repeating the same event
                                                   which was sent earlier */
        char                   portmap_err_logged; /* flag used to prevent
                                                      excessive logging */
        char                   need_different_port; /* flag used to change the
                                                       portmap path in case of
                                                       'tcp,rdma' on server */
        gf_boolean_t           lk_heal;
        uint16_t               lk_version; /* this variable is used to distinguish
                                              client-server transaction while
                                              performing lock healing */
        struct timeval         grace_tv;
        gf_timer_t            *grace_timer;
        gf_boolean_t           grace_timer_flag; /* The state of this flag will
                                                    be used to decide whether
                                                    a new grace-timer must be
                                                    registered or not. False
                                                    means dont register, true
                                                    means register */
        char                   parent_down;
} clnt_conf_t;

typedef struct _client_fd_ctx {
        struct list_head  sfd_pos;      /*  Stores the reference to this
                                            fd's position in the saved_fds list.
                                        */
        int64_t           remote_fd;
        inode_t          *inode;
        uint64_t          ino;
        uint64_t          gen;
        char              is_dir;
        char              released;
        int32_t           flags;
        int32_t           wbflags;
        fd_lk_ctx_t      *lk_ctx;
        pthread_mutex_t   mutex;
        struct list_head  lock_list;     /* List of all granted locks on this fd */
} clnt_fd_ctx_t;

typedef struct _client_posix_lock {
        fd_t              *fd;            /* The fd on which the lk operation was made */

        struct gf_flock    user_flock;    /* the flock supplied by the user */
        off_t              fl_start;
        off_t              fl_end;
        short              fl_type;
        int32_t            cmd;           /* the cmd for the lock call */
        gf_lkowner_t       owner; /* lock owner from fuse */
        struct list_head   list;          /* reference used to add to the fdctx list of locks */
} client_posix_lock_t;

typedef struct client_local {
        loc_t                loc;
        loc_t                loc2;
        fd_t                *fd;
        clnt_fd_ctx_t       *fdctx;
        uint32_t             flags;
        uint32_t             wbflags;
        struct iobref       *iobref;

        client_posix_lock_t *client_lock;
        gf_lkowner_t         owner;
        int32_t              cmd;
        struct list_head     lock_list;
        pthread_mutex_t      mutex;
} clnt_local_t;

typedef struct client_args {
        loc_t              *loc;
        fd_t               *fd;
        dict_t             *xattr_req;
        const char         *linkname;
        struct iobref      *iobref;
        struct iovec       *vector;
        dict_t             *xattr;
        struct iatt        *stbuf;
        dict_t             *dict;
        loc_t              *oldloc;
        loc_t              *newloc;
        const char         *name;
        struct gf_flock    *flock;
        const char         *volume;
        const char         *basename;
        off_t               offset;
        int32_t             mask;
        int32_t             cmd;
        size_t              size;
        mode_t              mode;
        dev_t               rdev;
        int32_t             flags;
        int32_t             wbflags;
        int32_t             count;
        int32_t             datasync;
        entrylk_cmd         cmd_entrylk;
        entrylk_type        type;
        gf_xattrop_flags_t  optype;
        int32_t             valid;
        int32_t             len;
} clnt_args_t;

typedef ssize_t (*gfs_serialize_t) (struct iovec outmsg, void *args);

clnt_fd_ctx_t *this_fd_get_ctx (fd_t *file, xlator_t *this);
clnt_fd_ctx_t *this_fd_del_ctx (fd_t *file, xlator_t *this);
void this_fd_set_ctx (fd_t *file, xlator_t *this, loc_t *loc,
                      clnt_fd_ctx_t *ctx);

int client_local_wipe (clnt_local_t *local);
int client_submit_request (xlator_t *this, void *req,
                           call_frame_t *frame, rpc_clnt_prog_t *prog,
                           int procnum, fop_cbk_fn_t cbk,
                           struct iobref *iobref,
                           struct iovec *rsphdr, int rsphdr_count,
                           struct iovec *rsp_payload, int rsp_count,
                           struct iobref *rsp_iobref, xdrproc_t xdrproc);

int protocol_client_reopendir (xlator_t *this, clnt_fd_ctx_t *fdctx);
int protocol_client_reopen (xlator_t *this, clnt_fd_ctx_t *fdctx);

int unserialize_rsp_dirent (struct gfs3_readdir_rsp *rsp, gf_dirent_t *entries);
int unserialize_rsp_direntp (xlator_t *this, fd_t *fd,
                             struct gfs3_readdirp_rsp *rsp, gf_dirent_t *entries);

int clnt_readdir_rsp_cleanup (gfs3_readdir_rsp *rsp);
int clnt_readdirp_rsp_cleanup (gfs3_readdirp_rsp *rsp);
int client_attempt_lock_recovery (xlator_t *this, clnt_fd_ctx_t *fdctx);
int32_t delete_granted_locks_owner (fd_t *fd, gf_lkowner_t *owner);
int client_add_lock_for_recovery (fd_t *fd, struct gf_flock *flock,
                                  gf_lkowner_t *owner, int32_t cmd);
uint64_t decrement_reopen_fd_count (xlator_t *this, clnt_conf_t *conf);
int32_t delete_granted_locks_fd (clnt_fd_ctx_t *fdctx);
int32_t client_cmd_to_gf_cmd (int32_t cmd, int32_t *gf_cmd);
void client_save_number_fds (clnt_conf_t *conf, int count);
int dump_client_locks (inode_t *inode);
int client_notify_parents_child_up (xlator_t *this);
int32_t is_client_dump_locks_cmd (char *name);
int32_t client_dump_locks (char *name, inode_t *inode,
                           dict_t *dict);
int client_fdctx_destroy (xlator_t *this, clnt_fd_ctx_t *fdctx);

uint32_t client_get_lk_ver (clnt_conf_t *conf);

int32_t client_type_to_gf_type (short l_type);

int client_mark_fd_bad (xlator_t *this);

int client_set_lk_version (xlator_t *this);

int client_fd_lk_list_empty (fd_lk_ctx_t *lk_ctx, gf_boolean_t use_try_lock);
#endif /* !_CLIENT_H */