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/*
* parser.c : Utility for the Linux Multiple Devices driver
* Copyright (C) 1997 Ingo Molnar, Miguel de Icaza, Gadi Oxman
*
* 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 "config.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_superblock_t *sb;
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->next = cfg_head;
cfg_head = cfg;
cfg->sb.nr_disks = 0;
return 0;
}
if (!cfg)
return 1;
sb = &cfg->sb;
if (strcmp(par, "raid-level") == 0) {
if (val != 4 && val != 5 && val != 1) {
fprintf(stderr, "raid level %d not supported\n", val);
return 1;
}
sb->level = val;
return 0;
} else if (strcmp(par, "nr-raid-disks") == 0) {
if (val < 0)
return 1;
sb->raid_disks = val;
return 0;
} else if (strcmp(par, "nr-spare-disks") == 0) {
if (val < 0)
return 1;
sb->spare_disks = val;
return 0;
} else if (strcmp(par, "parity-algorithm") == 0) {
if (sb->level != 5) {
fprintf(stderr, "parity-algorithm undefined for raid level %d\n", sb->level);
return 1;
}
if (val < 0)
val = parity_algorithm_to_num(val_s);
if (val < 0)
return 1;
sb->parity_algorithm = val;
return 0;
} else if (strcmp(par, "chunk-size") == 0) {
if (sb->level != 4 && sb->level != 5) {
fprintf(stderr, "chunk-size undefined for raid level %d\n", sb->level);
return 1;
}
if (!val || val % 4) {
fprintf(stderr, "invalid chunk-size (%dkB)\n", val);
return 1;
}
sb->chunk_size = val * MD_BLK_SIZ;
return 0;
} else if (strcmp(par, "device") == 0) {
if (sb->nr_disks == MD_SB_DISKS) {
fprintf(stderr, "a maximum of %d devices in a set is supported\n", MD_SB_DISKS);
return 1;
}
i = sb->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);
sb->disks[i].raid_disk = i;
return 0;
} else if (strcmp(par, "raid-disk") == 0) {
if (!sb->nr_disks) {
fprintf(stderr, "\"device\" line expected\n");
return 1;
}
if (val >= sb->raid_disks) {
fprintf(stderr, "raid-disk should be smaller than raid_disks\n");
return 1;
}
i = sb->nr_disks - 1;
sb->disks[i].raid_disk = val;
return 0;
} else if (strcmp(par, "spare-disk") == 0) {
if (!sb->nr_disks) {
fprintf(stderr, "\"device\" line expected\n");
return 1;
}
i = sb->nr_disks - 1;
sb->disks[i].raid_disk = i;
return 0;
} else if (strcmp(par, "parity-disk") == 0) {
if (!sb->nr_disks) {
fprintf(stderr, "\"device\" line expected\n");
return 1;
}
if (sb->level != 4) {
fprintf(stderr, "parity_disk only supported for raid level 4\n");
return 1;
}
i = sb->nr_disks - 1;
sb->disks[i].raid_disk = sb->raid_disks - 1;
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];
printf("parsing configuration file\n");
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;
}
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