/* -*- mode: c; c-basic-offset: 8; -*-
 * vim: noexpandtab sw=8 ts=8 sts=0:
 *
 * op_features.c
 *
 * ocfs2 tune utility for adding and removing features.
 *
 * Copyright (C) 2004, 2008 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License version 2 as published by the Free Software Foundation.
 *
 * 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
 * General Public License for more details.
 */

#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <inttypes.h>

#include "ocfs2/ocfs2.h"

#include "libocfs2ne.h"


struct feature_op_state {
	struct tunefs_operation	*fo_op;
	ocfs2_fs_options	fo_feature_set;	/* Features to enabling */
	ocfs2_fs_options	fo_reverse_set;	/* Features to disable */
};

extern struct tunefs_feature backup_super_feature;
extern struct tunefs_feature extended_slotmap_feature;
extern struct tunefs_feature inline_data_feature;
extern struct tunefs_feature local_feature;
extern struct tunefs_feature metaecc_feature;
extern struct tunefs_feature sparse_files_feature;
extern struct tunefs_feature unwritten_extents_feature;
extern struct tunefs_feature xattr_feature;
extern struct tunefs_feature usrquota_feature;
extern struct tunefs_feature grpquota_feature;
extern struct tunefs_feature refcount_feature;
extern struct tunefs_feature indexed_dirs_feature;
extern struct tunefs_feature discontig_bg_feature;
extern struct tunefs_feature clusterinfo_feature;
extern struct tunefs_feature append_dio_feature;

/* List of features supported by ocfs2ne */
static struct tunefs_feature *features[] = {
	&backup_super_feature,
	&extended_slotmap_feature,
	&inline_data_feature,
	&local_feature,
	&metaecc_feature,
	&sparse_files_feature,
	&unwritten_extents_feature,
	&xattr_feature,
	&usrquota_feature,
	&grpquota_feature,
	&refcount_feature,
	&indexed_dirs_feature,
	&discontig_bg_feature,
	&clusterinfo_feature,
	&append_dio_feature,
	NULL,
};


static struct tunefs_feature *find_feature(ocfs2_fs_options *feature)
{
	int i;
	struct tunefs_feature *feat = NULL;

	for (i = 0; features[i]; i++) {
		feat = features[i];
		if (!memcmp(&feat->tf_feature, feature,
			    sizeof(ocfs2_fs_options))) {
			break;
		}
		feat = NULL;
	}

	return feat;
}


struct check_supported_context {
	struct feature_op_state		*sc_state;
	char				*sc_string;
	int				sc_error;
	enum tunefs_feature_action	sc_action;
};

/* Order doesn't actually matter here.  We just want to know that
 * tunefs supports this feature */
static int check_supported_func(ocfs2_fs_options *feature, void *user_data)
{
	int rc = 1;
	struct check_supported_context *ctxt = user_data;
	struct feature_op_state *state = ctxt->sc_state;
	struct tunefs_feature *feat = find_feature(feature);

	if (!feat) {
		errorf("One or more of the features in \"%s\" are not "
		       "supported by this program\n",
		       ctxt->sc_string);
		ctxt->sc_error = 1;
		goto out;
	}

	switch (ctxt->sc_action) {
		case FEATURE_ENABLE:
			if (!feat->tf_enable) {
				errorf("This program does not "
				       "support enabling feature "
				       "\"%s\"\n",
				       feat->tf_name);
				ctxt->sc_error = 1;
				goto out;
			}
			break;

		case FEATURE_DISABLE:
			if (!feat->tf_disable) {
				errorf("This program does not "
				       "support disabling feature "
				       "\"%s\"\n",
				       feat->tf_name);
				ctxt->sc_error = 1;
				goto out;
			}
			break;

		case FEATURE_NOOP:
			verbosef(VL_APP,
				 "Should have gotten a NOOP "
				 "action for feature \"%s\"\n",
				 feat->tf_name);
			rc = 0;
			goto out;
			break;

		default:
			errorf("Unknown action for feature \"%s\"\n",
			       feat->tf_name);
			ctxt->sc_error = 1;
			goto out;
			break;
	}

	verbosef(VL_APP, "%s feature \"%s\"\n",
		 ctxt->sc_action == FEATURE_ENABLE ?
		 "Enabling" : "Disabling",
		 feat->tf_name);
	feat->tf_action = ctxt->sc_action;
	state->fo_op->to_open_flags |= feat->tf_open_flags;

	rc = 0;

out:
	return rc;
}

static int features_parse_option(struct tunefs_operation *op, char *arg)
{
	int rc = 1;
	errcode_t err;
	struct feature_op_state *state = NULL;
	struct check_supported_context ctxt = {
		.sc_string = arg,
	};

	if (!arg) {
		errorf("No features specified\n");
		goto out;
	}

	err = ocfs2_malloc0(sizeof(struct feature_op_state), &state);
	if (err) {
		tcom_err(err, "while processing feature options");
		goto out;
	}

	state->fo_op = op;
	err = ocfs2_parse_feature(arg, &state->fo_feature_set,
				  &state->fo_reverse_set);
	if (err) {
		tcom_err(err, "while parsing feature options \"%s\"", arg);
		goto out;
	}

	ctxt.sc_state = state;
	ctxt.sc_action = FEATURE_ENABLE;
	ocfs2_feature_foreach(&state->fo_feature_set, check_supported_func,
			      &ctxt);
	if (ctxt.sc_error)
		goto out;

	ctxt.sc_action = FEATURE_DISABLE;
	ocfs2_feature_reverse_foreach(&state->fo_reverse_set,
				      check_supported_func,
				      &ctxt);
	if (ctxt.sc_error)
		goto out;

	rc = 0;

out:
	if (!rc)
		op->to_private = state;
	else if (state)
		ocfs2_free(&state);

	return rc;
}


struct run_features_context {
	struct feature_op_state	*rc_state;
	ocfs2_filesys		*rc_fs;
	int			rc_error;
};

static int run_feature_func(ocfs2_fs_options *feature, void *user_data)
{
	errcode_t err;
	struct run_features_context *ctxt = user_data;
	struct tunefs_feature *feat = find_feature(feature);

	err = tunefs_feature_run(ctxt->rc_fs, feat);
	if (err && (err != TUNEFS_ET_OPERATION_FAILED))
		tcom_err(err, "while toggling feature \"%s\"",
			 feat->tf_name);

	return err;
}

static int features_run(struct tunefs_operation *op, ocfs2_filesys *fs,
			int flags)
{
	struct feature_op_state *state = op->to_private;
	struct run_features_context ctxt = {
		.rc_state = state,
		.rc_fs = fs,
	};

	ocfs2_feature_reverse_foreach(&state->fo_reverse_set,
				      run_feature_func,
				      &ctxt);
	if (!ctxt.rc_error)
		ocfs2_feature_foreach(&state->fo_feature_set,
				      run_feature_func,
				      &ctxt);

	ocfs2_free(&state);
	op->to_private = NULL;

	return ctxt.rc_error;
}


DEFINE_TUNEFS_OP(features,
		 "Usage: debug_op_features [opts] <device> <features>\n",
		 0,
		 features_parse_option,
		 features_run);

#ifdef DEBUG_EXE
int main(int argc, char *argv[])
{
	return tunefs_op_main(argc, argv, &features_op);
}
#endif
