/* * parser.c : Utility for the Linux Multiple Devices driver *            Copyright (C) 1997 Ingo Molnar, Miguel de Icaza, Gadi Oxman *            Copyright (C) 1998 Erik Troan * * This is the config file parser. Lets rewrite it in Yacc+Lex if it gets * too complex. * * This source is covered by the GNU GPL, the same as all Linux kernel * sources. */#include "common.h"#include "parser.h"char *parity_algorithm_table[] = {	"left-asymmetric",	"right-asymmetric",	"left-symmetric",	"right-symmetric",	NULL};static int parity_algorithm_to_num(char *val){	int i = 0;	char **s = parity_algorithm_table;	while (*s) {		if (strcmp(*s, val) == 0)			return i;		s++; i++;	}	return -1;}static int process_entry (char *par, char *val_s){	int val, i;	md_raid_info_t *array;	md_cfg_entry_t *last;	if (!par[0] && !val_s[0]) {#if DEBUG		printf("Ignoring line\n");#endif /* DEBUG */		return 0;	}	if (par[0] == '#') {#if DEBUG		printf("Ignoring comment\n");#endif /* DEBUG */		return 0;	}	val = isdigit(val_s[0]) ? atoi(val_s) : -1;	if (strcmp(par, "raiddev") == 0) {		if ((cfg = malloc(sizeof(md_cfg_entry_t))) == NULL) {			fprintf(stderr, "couldn't allocate configuration entry\n");			return 1;		}#if DEBUG		printf("Processing MD device %s\n", val_s);#endif		memset(cfg, 0, sizeof(*cfg));		if ((cfg->md_name = malloc(strlen(val_s) + 1)) == NULL) {			fprintf(stderr, "out of memory\n");			return 1;		}		strcpy(cfg->md_name, val_s);		cfg->array.param.nr_disks = 0;		last = cfg_head;		while (last && last->next) last = last->next;		if (last) {		    last->next = cfg;		} else {		    cfg_head = cfg;		    cfg->next = NULL;		}		last = cfg;		return 0;	}	if (!cfg)		return 1;	array = &cfg->array;	if (strcmp(par, "raid-level") == 0) {		if (val == -1) {			if (!strcmp(val_s, "linear"))		    		val = -1;			if (!strcmp(val_s, "translucent"))		    		val = -2;			if (!strcmp(val_s, "hsm"))		    		val = -3;			if (!strcmp(val_s, "multipath"))		    		val = -4;		}		if (val != 4 && val != 5 && val != 1 && val != -1 &&			val != -2 && val != -3 && val != -4 && val != 0) {			fprintf(stderr, "raid level %d not supported\n", val);			return 1;		}		array->param.level = val;		if ((val == 0) || (val == -1))			array->param.not_persistent = 1;		else			array->param.not_persistent = 0;		return 0;	} else if (strcmp(par, "nr-raid-disks") == 0) {		if (val < 0)			return 1;		array->param.raid_disks = val;		return 0;	} else if (strcmp(par, "persistent-superblock") == 0) {		if ((val < 0) || (val > 1))			return 1;		array->param.not_persistent = 1-val;		return 0;	} else if (strcmp(par, "nr-spare-disks") == 0) {		if ((array->param.level < 1) && (array->param.level != -4) && val) {			fprintf(stderr, "nr-spare-disks must be zero for raid level %d\n", array->param.level);			return 1;		}		if (val < 0)			return 1;		array->param.spare_disks = val;		return 0;	} else if (strcmp(par, "parity-algorithm") == 0) {		if (array->param.level != 5) {			fprintf(stderr, "parity-algorithm undefined for raid level %d\n", array->param.level);			return 1;		}		if (val < 0)			val = parity_algorithm_to_num(val_s);		if (val < 0)			return 1;		array->param.layout = val;		return 0;	} else if (strcmp(par, "chunk-size") == 0) {		if (!val || val % 4 || ((1 << (ffs(val)-1)) != val)) {			fprintf(stderr, "invalid chunk-size (%dkB)\n", val);			return 1;		}		array->param.chunk_size = val * MD_BLK_SIZ;		return 0;	} else if (strcmp(par, "device") == 0) {		if (array->param.nr_disks == MD_SB_DISKS) {			fprintf(stderr, "a maximum of %d devices in a set is supported\n", MD_SB_DISKS);			return 1;		}		i = array->param.nr_disks++;		if ((cfg->device_name[i] = malloc(strlen(val_s) + 1)) == NULL) {			fprintf(stderr, "out of memory\n");			return 1;		}		strcpy(cfg->device_name[i], val_s);		array->disks[i].raid_disk = i;		return 0;	} else if (strcmp(par, "raid-disk") == 0) {		if (!array->param.nr_disks) {			fprintf(stderr, "\"device\" line expected\n");			return 1;		}		if (val >= array->param.raid_disks) {			fprintf(stderr, "raid-disk should be smaller than raid_disks\n");			return 1;		}		i = array->param.nr_disks - 1;		array->disks[i].raid_disk = val;		return 0;	} else if (strcmp(par, "spare-disk") == 0) {		if ((array->param.level != 5) && (array->param.level != 4) && (array->param.level != 1) && (array->param.level != -4)) {			fprintf(stderr, "spare-disk not supported for raid level %d\n", array->param.level);			return 1;		}		if (!array->param.nr_disks) {			fprintf(stderr, "\"device\" line expected\n");			return 1;		}		i = array->param.nr_disks - 1;		array->disks[i].raid_disk = i;		return 0;	} else if (strcmp(par, "parity-disk") == 0) {		if (!array->param.nr_disks) {			fprintf(stderr, "\"device\" line expected\n");			return 1;		}		if (array->param.level != 4) {			fprintf(stderr, "parity_disk only supported for raid level 4\n");			return 1;		}		i = array->param.nr_disks - 1;		array->disks[i].raid_disk = array->param.raid_disks - 1;		return 0;	} else if (strcmp(par, "failed-disk") == 0) {		if ((array->param.level != 5) && (array->param.level != 4) && (array->param.level != 1)) {			fprintf(stderr, "failed-disk not supported for raid level %d\n", array->param.level);			return 1;		}		if (val >= array->param.raid_disks) {			fprintf(stderr, "failed-disk should be smaller than raid_disks\n");			return 1;		}		i = array->param.nr_disks - 1;		array->disks[i].raid_disk = val;		array->disks[i].state |= (1 << MD_DISK_FAULTY);		array->param.failed_disks++;		return 0;		}	fprintf(stderr, "unrecognized option %s\n", par);	return 1;}int parse_config (FILE *fp){	int nr = 0;	char line[MAX_LINE_LENGTH], par[MAX_LINE_LENGTH], val[MAX_LINE_LENGTH];#if DEBUG	printf("parsing configuration file\n");#endif	while (1) {		if ((fgets(line, MAX_LINE_LENGTH, fp)) == NULL)			break;		nr++;#if DEBUG		printf("\n");		printf("parsing %s", line);#endif /* DEBUG */		par[0] = 0; val[0] = 0;		sscanf(line, "\t%s\t%s\n", par, val);#if DEBUG		printf("par == %s, val == %s\n", par, val);#endif /* DEBUG */		if (process_entry(par, val)) {			printf("detected error on line %d:\n\t%s", nr, line);			return 1;		}	}#if DEBUG	printf("finished to parse configuration file\n");#endif /* DEBUG */	return 0;}