/*
 * vim:noexpandtab:shiftwidth=8:tabstop=8:
 *
 * Copyright CEA/DAM/DIF  (2008)
 * contributeur : Philippe DENIEL   philippe.deniel@cea.fr
 *                Thomas LEIBOVICI  thomas.leibovici@cea.fr
 *
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 3 of
 * the License, or (at your option) any later version.
 *
 * This program 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 * ---------------------------------------
 */

/**
 * @file  nfs3_fsstat.c
 * @brief Routines used for managing the NFS4 COMPOUND functions.
 */
#include "config.h"
#include <stdio.h>
#include <string.h>
#include <pthread.h>
#include <fcntl.h>
#include <sys/file.h>		/* for having FNDELAY */
#include "hashtable.h"
#include "log.h"
#include "gsh_rpc.h"
#include "nfs23.h"
#include "nfs4.h"
#include "mount.h"
#include "nfs_core.h"
#include "nfs_exports.h"
#include "nfs_proto_functions.h"
#include "nfs_convert.h"
#include "nfs_proto_tools.h"

/**
 *
 * @brief The NFSPROC3_FSSTAT
 *
 * Implements the NFSPROC3_FSSTAT.
 *
 * @param[in]  arg     NFS argument union
 * @param[in]  req     SVC request related to this call
 * @param[out] res     Structure to contain the result of the call
 *
 * @retval NFS_REQ_OK if successful
 * @retval NFS_REQ_DROP if failed but retryable
 * @retval NFS_REQ_FAILED if failed and not retryable
 *
 */

int nfs3_fsstat(nfs_arg_t *arg, struct svc_req *req, nfs_res_t *res)
{
	fsal_dynamicfsinfo_t dynamicinfo;
	fsal_status_t fsal_status;
	struct fsal_obj_handle *obj = NULL;
	int rc = NFS_REQ_OK;

	LogNFS3_Operation(COMPONENT_NFSPROTO, req, &arg->arg_fsstat3.fsroot,
			  "");

	/* to avoid setting it on each error case */
	res->res_fsstat3.FSSTAT3res_u.resfail.obj_attributes.attributes_follow =
	    FALSE;

	obj = nfs3_FhandleToCache(&arg->arg_fsstat3.fsroot,
				    &res->res_fsstat3.status,
				    &rc);

	if (obj == NULL) {
		/* Status and rc have been set by nfs3_FhandleToCache */
		return rc;
	}

	/* Get statistics and convert from FSAL */
	fsal_status = fsal_statfs(obj, &dynamicinfo);

	if (FSAL_IS_ERROR(fsal_status)) {
		/* At this point we met an error */
		LogFullDebug(COMPONENT_NFSPROTO,
			     "failed statfs: fsal_status=%s",
			     fsal_err_txt(fsal_status));

		if (nfs_RetryableError(fsal_status.major)) {
			/* Drop retryable errors. */
			rc = NFS_REQ_DROP;
		} else {
			res->res_fsstat3.status =
						nfs3_Errno_status(fsal_status);
			rc = NFS_REQ_OK;
		}

		goto out;
	}

	LogFullDebug(COMPONENT_NFSPROTO,
		     "nfs_Fsstat --> dynamicinfo.total_bytes=%" PRIu64
		     " dynamicinfo.free_bytes=%" PRIu64
		     " dynamicinfo.avail_bytes=%" PRIu64,
		     dynamicinfo.total_bytes, dynamicinfo.free_bytes,
		     dynamicinfo.avail_bytes);
	LogFullDebug(COMPONENT_NFSPROTO,
		     "nfs_Fsstat --> dynamicinfo.total_files=%" PRIu64
		     " dynamicinfo.free_files=%" PRIu64
		     " dynamicinfo.avail_files=%" PRIu64,
		     dynamicinfo.total_files, dynamicinfo.free_files,
		     dynamicinfo.avail_files);

	nfs_SetPostOpAttr(obj,
			  &res->res_fsstat3.FSSTAT3res_u.resok.obj_attributes,
			  NULL);

	res->res_fsstat3.FSSTAT3res_u.resok.tbytes = dynamicinfo.total_bytes;
	res->res_fsstat3.FSSTAT3res_u.resok.fbytes = dynamicinfo.free_bytes;
	res->res_fsstat3.FSSTAT3res_u.resok.abytes = dynamicinfo.avail_bytes;
	res->res_fsstat3.FSSTAT3res_u.resok.tfiles = dynamicinfo.total_files;
	res->res_fsstat3.FSSTAT3res_u.resok.ffiles = dynamicinfo.free_files;
	res->res_fsstat3.FSSTAT3res_u.resok.afiles = dynamicinfo.avail_files;
	/* volatile FS */
	res->res_fsstat3.FSSTAT3res_u.resok.invarsec = 0;

	res->res_fsstat3.status = NFS3_OK;

	LogFullDebug(COMPONENT_NFSPROTO,
		     "nfs_Fsstat --> tbytes=%"PRIu64" fbytes=%"PRIu64
		     " abytes=%"PRIu64,
		     res->res_fsstat3.FSSTAT3res_u.resok.tbytes,
		     res->res_fsstat3.FSSTAT3res_u.resok.fbytes,
		     res->res_fsstat3.FSSTAT3res_u.resok.abytes);

	LogFullDebug(COMPONENT_NFSPROTO,
		     "nfs_Fsstat --> tfiles=%"PRIu64" fffiles=%"PRIu64
		     " afiles=%"PRIu64,
		     res->res_fsstat3.FSSTAT3res_u.resok.tfiles,
		     res->res_fsstat3.FSSTAT3res_u.resok.ffiles,
		     res->res_fsstat3.FSSTAT3res_u.resok.afiles);

	rc = NFS_REQ_OK;

 out:
	/* return references */
	obj->obj_ops->put_ref(obj);

	return rc;
}				/* nfs3_fsstat */

/**
 * @brief Free the result structure allocated for nfs3_fsstat
 *
 * This function frees the result structure allocated for nfs3_fsstat.
 *
 * @param[in] res Result structure
 *
 */
void nfs3_fsstat_free(nfs_res_t *res)
{
	/* Nothing to do here */
}
