/*
   Copyright (c) 2009-2010 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 _STAT_PREFETCH_H
#define _STAT_PREFETCH_H

#ifndef _CONFIG_H
#define _CONFIG_H
#include "config.h"
#endif

#include "glusterfs.h"
#include "dict.h"
#include "xlator.h"
#include "rbthash.h"
#include "hashfn.h"
#include "call-stub.h"
#include "locking.h"
#include "inode.h"
#include <libgen.h>

struct sp_cache {
        rbthash_table_t *table;
        uint64_t         expected_offset;    /* Offset where the next read will
                                              * happen.
                                              */
        gf_lock_t        lock;
        unsigned long    miss;
        unsigned long    hits;
        uint32_t         ref;
        xlator_t         *this;
};
typedef struct sp_cache sp_cache_t;

struct sp_fd_ctx {
        sp_cache_t *cache;
        inode_t    *parent_inode;       /*
                                         * inode corresponding to dirname (path)
                                         */
        char       *name;               /*
                                         * basename of path on which this fd is
                                         * opened
                                         */
};
typedef struct sp_fd_ctx sp_fd_ctx_t;

struct sp_inode_ctx {
        char             looked_up;
        char             lookup_in_progress;
        char             need_unwind;
        int32_t          op_ret;
        int32_t          op_errno;
        gf_lock_t        lock;
        struct list_head waiting_ops;
};
typedef struct sp_inode_ctx sp_inode_ctx_t;

struct sp_local {
        loc_t  loc;
        fd_t  *fd;
        char   is_lookup;
};
typedef struct sp_local sp_local_t;

struct sp_private {
        struct mem_pool  *mem_pool;
        gf_lock_t        lock;
};
typedef struct sp_private sp_private_t;


void sp_local_free (sp_local_t *local);

#define SP_STACK_UNWIND(frame, params ...) do {    \
        sp_local_t *__local = frame->local;        \
        frame->local = NULL;                       \
        STACK_UNWIND (frame, params);              \
        sp_local_free (__local);                   \
} while (0)

#define SP_STACK_DESTROY(frame) do {         \
        sp_local_t *__local = frame->local;  \
        frame->local = NULL;                 \
        STACK_DESTROY (frame->root);         \
        sp_local_free (__local);             \
} while (0)

#endif  /* #ifndef _STAT_PREFETCH_H */