/*
   Copyright (c) 2008-2009 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 _CONFIG_H
#define _CONFIG_H
#include "config.h"
#endif

/* TODO: add NS locking */

#include "statedump.h"
#include "dht-common.c"

/* TODO:
   - use volumename in xattr instead of "dht"
   - use NS locks
   - handle all cases in self heal layout reconstruction
   - complete linkfile selfheal
*/


void
dht_layout_dump (dht_layout_t  *layout, const char *prefix)
{

        char    key[GF_DUMP_MAX_BUF_LEN];
        int     i = 0;

        if (!layout)
                return;

        gf_proc_dump_build_key(key, prefix, "cnt");
        gf_proc_dump_write(key, "%d", layout->cnt);
        gf_proc_dump_build_key(key, prefix, "preset");
        gf_proc_dump_write(key, "%d", layout->preset);
        gf_proc_dump_build_key(key, prefix, "gen");
        gf_proc_dump_write(key, "%d", layout->gen);
        gf_proc_dump_build_key(key, prefix, "type");
        gf_proc_dump_write(key, "%d", layout->type);

        for (i = 0; i < layout->cnt; i++) {
                gf_proc_dump_build_key(key, prefix,"list[%d].err", i);
                gf_proc_dump_write(key, "%d", layout->list[i].err);
                gf_proc_dump_build_key(key, prefix,"list[%d].start", i);
                gf_proc_dump_write(key, "%u", layout->list[i].start);
                gf_proc_dump_build_key(key, prefix,"list[%d].stop", i);
                gf_proc_dump_write(key, "%u", layout->list[i].stop);
                if (layout->list[i].xlator) {
                        gf_proc_dump_build_key(key, prefix,
                                               "list[%d].xlator.type", i);
                        gf_proc_dump_write(key, "%s",
                                           layout->list[i].xlator->type);
                        gf_proc_dump_build_key(key, prefix,
                                               "list[%d].xlator.name", i);
                        gf_proc_dump_write(key, "%s",
                                           layout->list[i].xlator->name);
                }
        }
}


int32_t
dht_priv_dump (xlator_t *this)
{
	char            key_prefix[GF_DUMP_MAX_BUF_LEN];
	char            key[GF_DUMP_MAX_BUF_LEN];
        int             i = 0;
        dht_conf_t      *conf = NULL;
        int             ret = 0;

        if (!this)
                return -1;

        conf = this->private;

        if (!conf)
                return -1;

        ret = TRY_LOCK(&conf->subvolume_lock);

        if (ret != 0) {
                gf_log("", GF_LOG_WARNING, "Unable to lock dht subvolume %s",
                                this->name);
                return ret;
        }

        gf_proc_dump_add_section("xlator.cluster.dht.%s.priv", this->name);
        gf_proc_dump_build_key(key_prefix,"xlator.cluster.dht","%s.priv",
                               this->name);
        gf_proc_dump_build_key(key, key_prefix, "subvolume_cnt");
        gf_proc_dump_write(key,"%d", conf->subvolume_cnt);
        for (i = 0; i < conf->subvolume_cnt; i++) {
                gf_proc_dump_build_key(key, key_prefix, "subvolumes[%d]", i);
                gf_proc_dump_write(key, "%s.%s", conf->subvolumes[i]->type,
                                   conf->subvolumes[i]->name);
                if (conf->file_layouts && conf->file_layouts[i]){
                        gf_proc_dump_build_key(key, key_prefix,
                                               "file_layouts[%d]",i);
                        dht_layout_dump(conf->file_layouts[i], key);
                }
                if (conf->dir_layouts && conf->dir_layouts[i]) {
                        gf_proc_dump_build_key(key, key_prefix,
                                              "dir_layouts[%d]",i);
                        dht_layout_dump(conf->dir_layouts[i], key);
                }
                if (conf->subvolume_status) {
                        gf_proc_dump_build_key(key, key_prefix,
                                                "subvolume_status[%d]", i);
                        gf_proc_dump_write(key, "%d",
                                               (int)conf->subvolume_status[i]);
                }

        }

        gf_proc_dump_build_key(key, key_prefix,"default_dir_layout");
        dht_layout_dump(conf->default_dir_layout, key);

        gf_proc_dump_build_key(key, key_prefix, "local_volume");
        gf_proc_dump_write(key,"%s",
                            conf->local_volume?(conf->local_volume->name):"None");
        gf_proc_dump_build_key(key, key_prefix, "search_unhashed");
        gf_proc_dump_write(key, "%d", conf->search_unhashed);
        gf_proc_dump_build_key(key, key_prefix, "gen");
        gf_proc_dump_write(key, "%d", conf->gen);
        gf_proc_dump_build_key(key, key_prefix, "min_free_disk");
        gf_proc_dump_write(key, "%lu", conf->min_free_disk);
        gf_proc_dump_build_key(key, key_prefix, "disk_unit");
        gf_proc_dump_write(key, "%c", conf->disk_unit);
        gf_proc_dump_build_key(key, key_prefix, "refresh_interval");
        gf_proc_dump_write(key, "%d", conf->refresh_interval);
        gf_proc_dump_build_key(key, key_prefix, "unhashed_sticky_bit");
        gf_proc_dump_write(key, "%d", conf->unhashed_sticky_bit);
        if (conf ->du_stats) {
                gf_proc_dump_build_key(key, key_prefix,
                                "du_stats.avail_percent");
                gf_proc_dump_write(key, "%lf", conf->du_stats->avail_percent);
                gf_proc_dump_build_key(key, key_prefix,
                                "du_stats.avail_space");
                gf_proc_dump_write(key, "%lu", conf->du_stats->avail_space);
                gf_proc_dump_build_key(key, key_prefix,
                                "du_stats.log");
                gf_proc_dump_write(key, "%lu", conf->du_stats->log);
        }
        gf_proc_dump_build_key(key, key_prefix, "last_stat_fetch");
        gf_proc_dump_write(key, "%s", ctime(&conf->last_stat_fetch.tv_sec));

        UNLOCK(&conf->subvolume_lock);

        return 0;
}

int32_t
dht_inodectx_dump (xlator_t *this, inode_t *inode)
{
        int             ret = -1;
        char            key_prefix[GF_DUMP_MAX_BUF_LEN];
        dht_layout_t    *layout = NULL;
	uint64_t        tmp_layout = 0;

        if (!inode)
                return -1;

	ret = inode_ctx_get (inode, this, &tmp_layout);

        if (ret != 0)
                return ret;

        layout = (dht_layout_t *)(long)tmp_layout;

        if (!layout)
                return -1;

        gf_proc_dump_build_key(key_prefix, "xlator.cluster.dht",
                               "%s.inode.%ld", this->name, inode->ino);
        dht_layout_dump(layout, key_prefix);

        return 0;
}

int
notify (xlator_t *this, int event, void *data, ...)
{
	int ret = -1;

	ret = dht_notify (this, event, data);

	return ret;
}

void
fini (xlator_t *this)
{
        int         i = 0;
        dht_conf_t *conf = NULL;

	conf = this->private;

        if (conf) {
                if (conf->file_layouts) {
                        for (i = 0; i < conf->subvolume_cnt; i++) {
                                FREE (conf->file_layouts[i]);
                        }
                        FREE (conf->file_layouts);
                }

                if (conf->default_dir_layout)
                        FREE (conf->default_dir_layout);

                if (conf->subvolumes)
                        FREE (conf->subvolumes);

		if (conf->subvolume_status)
			FREE (conf->subvolume_status);

                FREE (conf);
        }

	return;
}

int
init (xlator_t *this)
{
        dht_conf_t    *conf = NULL;
	char          *temp_str = NULL;
        int            ret = -1;
        int            i = 0;
        uint32_t       temp_free_disk = 0;

	if (!this->children) {
		gf_log (this->name, GF_LOG_CRITICAL,
			"Distribute needs more than one subvolume");
		return -1;
	}
  
	if (!this->parents) {
		gf_log (this->name, GF_LOG_WARNING,
			"dangling volume. check volfile");
	}

        conf = CALLOC (1, sizeof (*conf));
        if (!conf) {
                gf_log (this->name, GF_LOG_ERROR,
                        "Out of memory");
                goto err;
        }

	conf->search_unhashed = 0;

	if (dict_get_str (this->options, "lookup-unhashed", &temp_str) == 0) {
		gf_string2boolean (temp_str, &conf->search_unhashed);
	}

	conf->unhashed_sticky_bit = 0;

	if (dict_get_str (this->options, "unhashed-sticky-bit", 
                          &temp_str) == 0) {
	        gf_string2boolean (temp_str, &conf->unhashed_sticky_bit);
	}
        
        conf->disk_unit = 'p';
        conf->min_free_disk = 10;

	if (dict_get_str (this->options, "min-free-disk", &temp_str) == 0) {
		if (gf_string2percent (temp_str, &temp_free_disk) == 0) {
                        if (temp_free_disk > 100) {
                                gf_string2bytesize (temp_str, 
                                                    &conf->min_free_disk);
                                conf->disk_unit = 'b';
                        } else {
                                conf->min_free_disk = (uint64_t)temp_free_disk;
                        }
                } else {
                        gf_string2bytesize (temp_str, &conf->min_free_disk);
                        conf->disk_unit = 'b';
                }
	}


        ret = dht_init_subvolumes (this, conf);
        if (ret == -1) {
                goto err;
        }

        ret = dht_layouts_init (this, conf);
        if (ret == -1) {
                goto err;
        }

        conf->du_stats = CALLOC (conf->subvolume_cnt, sizeof (dht_du_t));
        if (!conf->du_stats) {
                gf_log (this->name, GF_LOG_ERROR,
                        "Out of memory");
                goto err;
        }

	LOCK_INIT (&conf->subvolume_lock);
	LOCK_INIT (&conf->layout_lock);

	conf->gen = 1;

        this->private = conf;

        return 0;

err:
        if (conf) {
                if (conf->file_layouts) {
                        for (i = 0; i < conf->subvolume_cnt; i++) {
                                FREE (conf->file_layouts[i]);
                        }
                        FREE (conf->file_layouts);
                }

                if (conf->default_dir_layout)
                        FREE (conf->default_dir_layout);

                if (conf->subvolumes)
                        FREE (conf->subvolumes);

		if (conf->subvolume_status)
			FREE (conf->subvolume_status);

                if (conf->du_stats)
                        FREE (conf->du_stats);

                FREE (conf);
        }

        return -1;
}


struct xlator_fops fops = {
	.lookup      = dht_lookup,
	.mknod       = dht_mknod,
	.create      = dht_create,

	.stat        = dht_stat,
	.fstat       = dht_fstat,
	.truncate    = dht_truncate,
	.ftruncate   = dht_ftruncate,
	.access      = dht_access,
	.readlink    = dht_readlink,
	.setxattr    = dht_setxattr,
	.getxattr    = dht_getxattr,
	.removexattr = dht_removexattr,
	.open        = dht_open,
	.readv       = dht_readv,
	.writev      = dht_writev,
	.flush       = dht_flush,
	.fsync       = dht_fsync,
	.statfs      = dht_statfs,
	.lk          = dht_lk,
	.opendir     = dht_opendir,
	.readdir     = dht_readdir,
	.readdirp    = dht_readdirp,
	.fsyncdir    = dht_fsyncdir,
	.symlink     = dht_symlink,
	.unlink      = dht_unlink,
	.link        = dht_link,
	.mkdir       = dht_mkdir,
	.rmdir       = dht_rmdir,
	.rename      = dht_rename,
	.inodelk     = dht_inodelk,
	.finodelk    = dht_finodelk,
	.entrylk     = dht_entrylk,
	.fentrylk    = dht_fentrylk,
	.xattrop     = dht_xattrop,
	.fxattrop    = dht_fxattrop,
        .setattr     = dht_setattr, 
        .fsetattr    = dht_fsetattr,
#if 0
	.setdents    = dht_setdents,
	.getdents    = dht_getdents,
	.checksum    = dht_checksum,
#endif
};


struct xlator_mops mops = {
};

struct xlator_dumpops dumpops = {
        .priv = dht_priv_dump,
        .inodectx = dht_inodectx_dump,
};


struct xlator_cbks cbks = {
//	.release    = dht_release,
//      .releasedir = dht_releasedir,
	.forget     = dht_forget
};


struct volume_options options[] = {
        { .key  = {"lookup-unhashed"}, 
	  .type = GF_OPTION_TYPE_BOOL 
	},
        { .key  = {"min-free-disk"},
          .type = GF_OPTION_TYPE_PERCENT_OR_SIZET,
        },
        { .key = {"unhashed-sticky-bit"},
          .type = GF_OPTION_TYPE_BOOL
        },
	{ .key  = {NULL} },
};