source: MondoRescue/branches/3.2/mondo/src/common/libmondo-raid.c

/* libmondo-raid.c                                                subroutines for handling RAID
   $Id: libmondo-raid.c 3614 2016-11-18 16:31:43Z bruno $
*/


/**
 * @file
 * Functions for handling RAID (especially during restore).
 */

#include "my-stuff.h"
#include "mondostructures.h"
#include "libmondo-gui-EXT.h"
#include "libmondo-files-EXT.h"
#include "libmondo-tools-EXT.h"
#include "libmondo-string-EXT.h"
#include "libmondo-fork-EXT.h"
#include "lib-common-externs.h"
#include "libmondo-raid.h"
#include "mr_mem.h"
#include "mr_str.h"

#ifdef __FreeBSD__
/* Nonstandard library functions: */
extern void errx(int exitval, const char *fmt, ...);
extern char *strsep(char **stringp, const char *delim);
#endif

/*@unused@*/
//static char cvsid[] = "$Id: libmondo-raid.c 3614 2016-11-18 16:31:43Z bruno $";


/**
 * @addtogroup raidGroup
 * @{
 */
/**
 * See if a particular RAID level is supported by the kernel.
 * @param raidno The RAID level (-1 through 5) to check. -1 means "linear" under Linux and
 * "concatenated" under FreeBSD. It's really the same thing, just different wording.
 * @return TRUE if it's supported, FALSE if not.
 */
bool is_this_raid_personality_registered(int raidno)
{
#ifdef __FreeBSD__
    return ((raidno == -1) || (raidno == 0) || (raidno == 1)
            || (raidno == 5)) ? TRUE : FALSE;
#else
    /*@ buffer ********************************************************** */
    char *command = NULL;
    int res;

    mr_asprintf(command, "grep \"");
    if (raidno == -1) {
        mr_strcat(command, "linear");
    } else {
        mr_strcat(command, "raid%d", raidno);
    }
    mr_strcat(command, "\" /proc/mdstat > /dev/null 2> /dev/null");
    log_it("Is raid %d registered? Command = '%s'", raidno, command);
    res = system(command);
    paranoid_free(command);

    if (res) {
        return (FALSE);
    } else {
        return (TRUE);
    }
#endif
}






/**
 * Search for @p device in @p disklist.
 * @param disklist The disklist to search in.
 * @param device The device to search for.
 * @return The index number of @p device, or -1 if it does not exist.
 */
int
where_in_drivelist_is_drive(struct list_of_disks *disklist, char *device)
{

    /*@ int ************************************************************* */
    int i = 0;

    assert(disklist != NULL);
    assert_string_is_neither_NULL_nor_zerolength(device);

    for (i = 0; i < disklist->entries; i++) {
        if (!strcmp(disklist->el[i].device, device)) {
            break;
        }
    }
    if (i == disklist->entries) {
        return (-1);
    } else {
        return (i);
    }
}








/**
 * Determine which RAID device is using a particular partition.
 * @param raidlist The RAID information structure.
 * @param device The partition to find out about.
 * @return The index number of the RAID device using @p device, or -1 if there is none.
 */
int
which_raid_device_is_using_this_partition(struct raidlist_itself *raidlist,
                                          char *device)
{
#ifdef __FreeBSD__
// FreeBSD-specific version of which_raid_device_is_using_this_partition()
    /*@ int ********************************************************* */
    int i = 0;

    for (i = 0; i < raidlist->entries; i++) {
        bool thisone = FALSE;
        int j, k, l;

        for (j = 0; j < raidlist->el[i].plexes; ++j) {
            for (k = 0; k < raidlist->el[i].plex[j].subdisks; ++k) {
                for (l = 0; l < raidlist->disks.entries; ++l) {
                    if (!strcmp(raidlist->disks.el[l].device,
                                device) &&
                        !strcmp(raidlist->el[i].plex[j].sd[k].which_device,
                                raidlist->disks.el[l].name))
                        thisone = TRUE;
                }
            }
        }

        if (thisone) {
            break;
        }
    }
    if (i == raidlist->entries) {
        return (-1);
    } else {
        return (i);
    }
}

#else
// Linux-specific version of which_raid_device_is_using_this_partition()
// and one other function which FreeBSD doesn't use

    int current_raiddev = 0;

    assert_string_is_neither_NULL_nor_zerolength(device);
    assert(raidlist != NULL);

    for (current_raiddev = 0; current_raiddev < raidlist->entries;
         current_raiddev++) {
        if (where_in_drivelist_is_drive
            (&raidlist->el[current_raiddev].data_disks, device) >= 0
            || where_in_drivelist_is_drive(&raidlist->el[current_raiddev].
                                           spare_disks, device) >= 0
            || where_in_drivelist_is_drive(&raidlist->el[current_raiddev].
                                           parity_disks, device) >= 0
            || where_in_drivelist_is_drive(&raidlist->el[current_raiddev].
                                           failed_disks, device) >= 0) {
            break;
        }
    }
    if (current_raiddev == raidlist->entries) {
        return (-1);
    } else {
        return (current_raiddev);
    }
}

/**
 * Write an @c int variable to a list of RAID variables.
 * @param raidrec The RAID device record to write to.
 * @param lino The variable index number to modify/create.
 * @param label The label to write.
 * @param value The value to write.
 */
void
write_variableINT_to_raid_var_line(struct raid_device_record *raidrec,
                                   int lino, char *label, int value)
{
    /*@ buffers ***************************************************** */
    char *sz_value = NULL;

    assert(raidrec != NULL);
    assert(label != NULL);

    mr_asprintf(sz_value, "%d", value);
    strcpy(raidrec->additional_vars.el[lino].label, label);
    strcpy(raidrec->additional_vars.el[lino].value, sz_value);
    mr_free(sz_value);
}
#endif








#ifdef __FreeBSD__
/**
 * Add a disk to a RAID plex.
 * @param p The plex to add the device to.
 * @param device_to_add The device to add to @p p.
 */
void add_disk_to_raid_device(struct vinum_plex *p, char *device_to_add)
{
    strcpy(p->sd[p->subdisks].which_device, device_to_add);
    ++p->subdisks;

}
#else
/**
 * Add a disk to a RAID device.
 * @param disklist The disklist to add the device to.
 * @param device_to_add The device to add to @p disklist.
 * @param index The index number of the disklist entry we're creating.
 */
void add_disk_to_raid_device(struct list_of_disks *disklist,
                             char *device_to_add, int index)
{
    int items;

    assert(disklist != NULL);
    assert_string_is_neither_NULL_nor_zerolength(device_to_add);
    items = disklist->entries;
    strcpy(disklist->el[items].device, device_to_add);
    disklist->el[items].index = index;
    items++;
    disklist->entries = items;
    log_msg(3, "Adding device %s (%d)", device_to_add, index);
}
#endif


/**
 * Save the additional RAID variables to a stream.
 * @param vars The RAID variable list to save.
 * @param fout The FILE pointer to save them to.
 */
void
save_additional_vars_to_file(struct additional_raid_variables *vars,
                             FILE * fout)
{
    int i;

    assert(vars != NULL);
    assert(fout != NULL);

    for (i = 0; i < vars->entries; i++) {
        fprintf(fout, "    %-21s %s\n", vars->el[i].label,
                vars->el[i].value);
    }
}


/**
 * Save a raidlist structure to disk in raidtab format.
 * @param raidlist The raidlist to save.
 * @param fname The file to save it to.
 * @return 0, always.
 * @bug Return value is redundant.
 */
int save_raidlist_to_raidtab(struct raidlist_itself *raidlist, char *fname)
{
    FILE *fout;
    int current_raid_device;
#ifdef __FreeBSD__
    int i;
#else
// Linux
#endif

    assert(raidlist != NULL);
    assert_string_is_neither_NULL_nor_zerolength(fname);

    if (raidlist->entries <= 0) {
        unlink(fname);
        log_it("Deleting raidtab (no RAID devs anyway)");
        return (0);
    }
    if (!(fout = fopen(fname, "w"))) {
        log_OS_error("Failed to save raidlist");
        return (1);
    }
    fprintf(fout, "# Generated by Mondo Rescue\n");

#ifdef __FreeBSD__
    for (i = 0; i < raidlist->disks.entries; ++i) {
        fprintf(fout, "drive %s device %s\n", raidlist->disks.el[i].name,
                raidlist->disks.el[i].device);
    }
    for (i = 0; i < (raidlist->spares.entries); ++i) {
        fprintf(fout, "drive %s device %s hotspare\n",
                raidlist->spares.el[i].name,
                raidlist->spares.el[i].device);
    }
#endif

    for (current_raid_device = 0; current_raid_device < raidlist->entries;
         current_raid_device++) {
        save_raidrec_to_file(&raidlist->el[current_raid_device], fout);
    }
    paranoid_fclose(fout);
    return (0);
}


/**
 * Save an individual RAID device record to a stream.
 * @param raidrec The RAID device record to save.
 * @param fout The stream to save it to.
 */
void save_raidrec_to_file(struct
#ifdef __FreeBSD__
                          vinum_volume
#else
                          raid_device_record
#endif
                          * raidrec, FILE * fout)
{
#ifdef __FreeBSD__
    int i, j;
    char *org = NULL;

    fprintf(fout, "\nvolume %s\n", raidrec->volname);
    for (i = 0; i < raidrec->plexes; ++i) {
        switch (raidrec->plex[i].raidlevel) {
        case -1:
            mr_asprintf(org, "concat");
            break;
        case 0:
            mr_asprintf(org, "striped");
            break;
        case 5:
            mr_asprintf(org, "raid5");
            break;
        }
        fprintf(fout, "  plex org %s", org);
        mr_free(org);

        if (raidrec->plex[i].raidlevel != -1) {
            fprintf(fout, " %ik", raidrec->plex[i].stripesize);
        }
        fprintf(fout, "\n");

        for (j = 0; j < raidrec->plex[i].subdisks; ++j) {
            fprintf(fout, "    sd drive %s size 0\n", raidrec->plex[i].sd[j].which_device);
        }
    }
#else
    assert(raidrec != NULL);
    assert(fout != NULL);

    fprintf(fout, "raiddev %s\n", raidrec->raid_device);
    if (raidrec->raid_level == -2) {
        fprintf(fout, "    raid-level            multipath\n");
    } else if (raidrec->raid_level == -1) {
        fprintf(fout, "    raid-level            linear\n");
    } else {
        fprintf(fout, "    raid-level            %d\n", raidrec->raid_level);
    }
    fprintf(fout, "    nr-raid-disks         %d\n", raidrec->data_disks.entries);
    if (raidrec->spare_disks.entries > 0) {
        fprintf(fout, "    nr-spare-disks        %d\n", raidrec->spare_disks.entries);
    }
    if (raidrec->parity_disks.entries > 0) {
        fprintf(fout, "    nr-parity-disks       %d\n", raidrec->parity_disks.entries);
    }
    fprintf(fout, "    persistent-superblock %d\n", raidrec->persistent_superblock);
    if (raidrec->chunk_size > -1) {
      fprintf(fout, "    chunk-size            %d\n", raidrec->chunk_size);
    }
    if (raidrec->parity > -1) {
      switch(raidrec->parity) {
      case 0:
        fprintf(fout, "    parity-algorithm      left-asymmetric\n");
        break;
      case 1:
        fprintf(fout, "    parity-algorithm      right-asymmetric\n");
        break;
      case 2:
        fprintf(fout, "    parity-algorithm      left-symmetric\n");
        break;
      case 3:
        fprintf(fout, "    parity-algorithm      right-symmetric\n");
        break;
      default:
        fatal_error("Unknown RAID parity algorithm.");
        break;
      }
    }
    save_additional_vars_to_file(&raidrec->additional_vars, fout);
    fprintf(fout, "\n");
    save_disklist_to_file("raid-disk", &raidrec->data_disks, fout);
    save_disklist_to_file("spare-disk", &raidrec->spare_disks, fout);
    save_disklist_to_file("parity-disk", &raidrec->parity_disks, fout);
    save_disklist_to_file("failed-disk", &raidrec->failed_disks, fout);
    fprintf(fout, "\n");
#endif
}

/**
 * Retrieve the next line from a raidtab stream.
 * @param fin The file to read the input from.
 * @param label Where to put the line's label.
 * @param value Where to put the line's value.
 * @return 0 if the line was read and stored successfully, 1 if we're at end of file.
 */
static int get_next_raidtab_line(FILE * fin, char **label, char **value)
{
    char *incoming = NULL;
    char *p = NULL;
    char *res = NULL;

    assert(fin != NULL);

    if (feof(fin)) {
        return (1);
    }

    for (mr_getline(res, fin); !feof(fin); mr_getline(res, fin)) {
        log_msg(10,"Found in raidtab line: %s",res);
        incoming = mr_strip_spaces(res);
        mr_free(res);
        p = strchr(incoming, ' ');
        if (strlen(incoming) < 3 || incoming[0] == '#' || !p) {
            mr_free(incoming);
            continue;
        }
        *(p++) = '\0';
        while (*p == ' ') {
            p++;
        }
        *label = incoming;
        *value = p;
        log_msg(10,"Found in raidtab pair: %s|%s",*label,*value);
        return (0);
    }
    return (1);
}



/**
 * Load a raidtab file into a raidlist structure.
 * @param raidlist The raidlist to fill.
 * @param fname The file to read from.
 * @return 0 for success, 1 for failure.
 */
#ifdef __FreeBSD__
int load_raidtab_into_raidlist(struct raidlist_itself *raidlist, char *fname)
{
    FILE *fin;
    int items;

    raidlist->spares.entries = 0;
    raidlist->disks.entries = 0;
    if (length_of_file(fname) < 5) {
        log_it("Raidtab is very small or non-existent. Ignoring it.");
        raidlist->entries = 0;
        return (0);
    }
    if (!(fin = fopen(fname, "r"))) {
        log_it("Cannot open raidtab");
        return (1);
    }
    items = 0;
    log_it("Loading raidtab...");
    while (!feof(fin)) {
        int argc;
        char **argv = get_next_vinum_conf_line(fin, &argc);
        if (!argv)
            break;
        if (!strcmp(argv[0], "drive")) {
            char *drivename, *devname;
            if (argc < 4)
                continue;
            drivename = argv[1];
            devname = get_option_val(argc, argv, "device");
            if (!devname)
                continue;

            if (get_option_state(argc, argv, "hotspare")) {
                strcpy(raidlist->spares.el[raidlist->spares.entries].name, drivename);
                strcpy(raidlist->spares.el[raidlist->spares.entries].device, devname);
                raidlist->spares.el[raidlist->spares.entries].index = raidlist->disks.entries;
                raidlist->spares.entries++;
            } else {
                strcpy(raidlist->disks.el[raidlist->disks.entries].name, drivename);
                strcpy(raidlist->disks.el[raidlist->disks.entries].device, devname);
                raidlist->disks.el[raidlist->disks.entries].index = raidlist->disks.entries;
                raidlist->disks.entries++;
            }
        } else if (!strcmp(argv[0], "volume")) {
            char *volname;
            if (argc < 2)
                continue;
            volname = argv[1];
            strcpy(raidlist->el[raidlist->entries].volname, volname);
            raidlist->el[raidlist->entries].plexes = 0;
            raidlist->entries++;
        } else if (!strcmp(argv[0], "plex")) {
            int raidlevel, stripesize;
            char *org = 0;
            char **tmp = 0;
            if (argc < 3)
                continue;
            org = get_option_val(argc, argv, "org");
            if (!org)
                continue;
            if (strcmp(org, "concat")) {
                tmp = get_option_vals(argc, argv, "org", 2);
                if (tmp && tmp[1]) {
                    stripesize = (int) (size_spec(tmp[1]) / 1024);
                } else
                    stripesize = 279;
            } else
                stripesize = 0;

            if (!strcmp(org, "concat")) {
                raidlevel = -1;
            } else if (!strcmp(org, "striped")) {
                raidlevel = 0;
            } else if (!strcmp(org, "raid5")) {
                raidlevel = 5;
            } else
                continue;

            raidlist->el[raidlist->entries - 1].plex
                [raidlist->el[raidlist->entries - 1].plexes].raidlevel =
                raidlevel;
            raidlist->el[raidlist->entries -
                         1].plex[raidlist->el[raidlist->entries -
                                              1].plexes].stripesize =
                stripesize;
            raidlist->el[raidlist->entries -
                         1].plex[raidlist->el[raidlist->entries -
                                              1].plexes].subdisks = 0;
            raidlist->el[raidlist->entries - 1].plexes++;
        } else if ((!strcmp(argv[0], "sd"))
                   || (!strcmp(argv[0], "subdisk"))) {
            char *drive = 0;
            if (argc < 3)
                continue;
            drive = get_option_val(argc, argv, "drive");
            if (!drive)
                continue;

            strcpy(raidlist->el[raidlist->entries - 1].plex
                   [raidlist->el[raidlist->entries - 1].plexes - 1].sd
                   [raidlist->el[raidlist->entries - 1].plex
                    [raidlist->el[raidlist->entries - 1].plexes -
                     1].subdisks].which_device, drive);
            raidlist->el[raidlist->entries -
                         1].plex[raidlist->el[raidlist->entries -
                                              1].plexes - 1].subdisks++;
        }
    }
    fclose(fin);
    log_it("Raidtab loaded successfully.");
    log_it("%d RAID devices in raidtab", raidlist->entries);
    return (0);
}


#else

int load_raidtab_into_raidlist(struct raidlist_itself *raidlist, char *fname) {

    FILE *fin = NULL;
    char *label = NULL;
    char *value = NULL;
    int items = 0;
    int v = 0;

    assert(raidlist != NULL);
    assert_string_is_neither_NULL_nor_zerolength(fname);

    if (length_of_file(fname) < 5) {
        log_it("Raidtab is very small or non-existent. Ignoring it.");
        raidlist->entries = 0;
        return (0);
    }
    if (!(fin = fopen(fname, "r"))) {
        log_it("Cannot open raidtab");
        return (1);
    }
    log_it("Loading raidtab...");
    get_next_raidtab_line(fin, &label, &value);
    while (!feof(fin)) {
        log_msg(1, "Looking for raid record #%d", items);
        initialize_raidrec(&raidlist->el[items]);
        v = 0;
        /* find the 'raiddev' entry, indicating the start of the block of info */
        while (!feof(fin) && strcmp(label, "raiddev")) {
            strcpy(raidlist->el[items].additional_vars.el[v].label, label);
            strcpy(raidlist->el[items].additional_vars.el[v].value, value);
            mr_free(label);
            log_msg(2,"Found raidtab entry Label: %s Value: %s",raidlist->el[items].additional_vars.el[v].label,raidlist->el[items].additional_vars.el[v].value);
            v++;
            get_next_raidtab_line(fin, &label, &value);
        }

        raidlist->el[items].additional_vars.entries = v;
        if (feof(fin)) {
            log_msg(1, "No more records.");
            continue;
        }
        log_msg(2, "Record #%d (%s) found", items, value);
        strcpy(raidlist->el[items].raid_device, value);
        mr_free(label);
        for (get_next_raidtab_line(fin, &label, &value); !feof(fin) && strcmp(label, "raiddev"); get_next_raidtab_line(fin, &label, &value)) {
            process_raidtab_line(fin, &raidlist->el[items], label, value);
            mr_free(label);
        }
        items++;
    }
    mr_free(label);
    paranoid_fclose(fin);
    raidlist->entries = items;
    log_msg(1, "Raidtab loaded successfully.");
    log_msg(1, "%d RAID devices in raidtab", items);
    return (0);
}
#endif








#ifndef __FreeBSD__
/**
 * Process a single line from the raidtab and store the results into @p raidrec.
 * @param fin The stream to read the line from.
 * @param raidrec The RAID device record to update.
 * @param label Where to put the label processed.
 * @param value Where to put the value processed.
 */
void
process_raidtab_line(FILE * fin, struct raid_device_record *raidrec, char *label, char *value)
{

    /*@ add mallocs * */
    char *labelB = NULL;
    char *valueB = NULL;

    struct list_of_disks *disklist;
    int index;
    int v;

    assert(fin != NULL);
    assert(raidrec != NULL);
    assert_string_is_neither_NULL_nor_zerolength(label);
    assert(value != NULL);

    if (!strcmp(label, "raid-level")) {
        if (!strcmp(value, "multipath")) {
            raidrec->raid_level = -2;
        } else if (!strcmp(value, "linear")) {
            raidrec->raid_level = -1;
        } else {
            raidrec->raid_level = atoi(value);
        }
        log_msg(4,"Found raid level %d",raidrec->raid_level);
    } else if (!strcmp(label, "nr-raid-disks")) {   /* ignore it */
    } else if (!strcmp(label, "nr-spare-disks")) {  /* ignore it */
    } else if (!strcmp(label, "nr-parity-disks")) { /* ignore it */
    } else if (!strcmp(label, "nr-failed-disks")) { /* ignore it */
    } else if (!strcmp(label, "persistent-superblock")) {
        raidrec->persistent_superblock = atoi(value);
    } else if (!strcmp(label, "chunk-size")) {
        raidrec->chunk_size = atoi(value);
    } else if (!strcmp(label, "parity-algorithm")) {
        if (!strcmp(value, "left-asymmetric")) {
            raidrec->parity = 0;
        } else if (!strcmp(value, "right-asymmetric")) {
            raidrec->parity = 1;
        } else if (!strcmp(value, "left-symmetric")) {
            raidrec->parity = 2;
        } else if (!strcmp(value, "right-symmetric")) {
            raidrec->parity = 3;
        } else {
            log_msg(1, "Unknown RAID parity algorithm '%s'", value);
        }
        log_msg(4,"Found raid parity %d",raidrec->parity);
    } else if (!strcmp(label, "device")) {
        get_next_raidtab_line(fin, &labelB, &valueB);
        if (!strcmp(labelB, "raid-disk")) {
            disklist = &raidrec->data_disks;
        } else if (!strcmp(labelB, "spare-disk")) {
            disklist = &raidrec->spare_disks;
        } else if (!strcmp(labelB, "parity-disk")) {
            disklist = &raidrec->parity_disks;
        } else if (!strcmp(labelB, "failed-disk")) {
            disklist = &raidrec->failed_disks;
        } else {
            disklist = NULL;
        }
        if (!disklist) {
            log_it("Ignoring '%s %s' pair of disk %s", labelB, valueB, label);
        } else {
            index = atoi(valueB);
            add_disk_to_raid_device(disklist, value, index);
        }
        mr_free(labelB);
    } else {
        v = raidrec->additional_vars.entries;
        strcpy(raidrec->additional_vars.el[v].label, label);
        strcpy(raidrec->additional_vars.el[v].value, value);
        log_msg(4,"Found additional raid pair #%d: %s / %s",v,raidrec->additional_vars.el[v].label,raidrec->additional_vars.el[v].value);
        v++;
        raidrec->additional_vars.entries = v;
    }
}
#endif


/**
 * Save a disklist to a stream in raidtab format.
 * @param listname One of "raid-disk", "spare-disk", "parity-disk", or "failed-disk".
 * @param disklist The disklist to save to @p fout.
 * @param fout The stream to write to.
 */
void
save_disklist_to_file(char *listname, struct list_of_disks *disklist, FILE * fout)
{
    int i;

    assert_string_is_neither_NULL_nor_zerolength(listname);
    assert(disklist != NULL);
    assert(fout != NULL);

    for (i = 0; i < disklist->entries; i++) {
        fprintf(fout, "    device                %s\n", disklist->el[i].device);
        fprintf(fout, "    %-21s %d\n", listname, disklist->el[i].index);
    }
}





#ifdef __FreeBSD__
/**
 * Add a new plex to a volume. The index of the plex will be <tt>v-\>plexes - 1</tt>.
 * @param v The volume to operate on.
 * @param raidlevel The RAID level of the new plex.
 * @param stripesize The stripe size (chunk size) of the new plex.
 */
void add_plex_to_volume(struct vinum_volume *v, int raidlevel,
                        int stripesize)
{
    v->plex[v->plexes].raidlevel = raidlevel;
    v->plex[v->plexes].stripesize = stripesize;
    v->plex[v->plexes].subdisks = 0;
    ++v->plexes;
}

/**
 * For internal use only.
 */
char **get_next_vinum_conf_line(FILE * f, int *argc)
{
    int cnt = 0;
    static char *argv[64];
    char **ap;
    char *line = NULL;

    mr_getline(line, f);
    if (feof(f)) {
        log_it("[GNVCL] Uh... I reached the EOF.");
        return 0;
    }

    for (ap = argv; (*ap = strsep(&line, " \t")) != NULL;)
        if (**ap != '\0') {
            if (++ap >= &argv[64])
                break;
            cnt++;
        }
    mr_free(line);

    if (strchr(argv[cnt - 1], '\n')) {
        *(strchr(argv[cnt - 1], '\n')) = '\0';
    }

    if (argc)
        *argc = cnt;
    return argv;
}

/**
 * For internal use only.
 */
char *get_option_val(int argc, char **argv, char *option)
{
    int i;
    for (i = 0; i < (argc - 1); ++i) {
        if (!strcmp(argv[i], option)) {
            return argv[i + 1];
        }
    }
    return 0;
}

/**
 * For internal use only.
 */
char **get_option_vals(int argc, char **argv, char *option, int nval)
{
    int i, j;
    static char **ret;
    ret = (char **) malloc(nval * sizeof(char *));
    for (i = 0; i < (argc - nval); ++i) {
        if (!strcmp(argv[i], option)) {
            for (j = 0; j < nval; ++j) {
                ret[j] = (char *) malloc(strlen(argv[i + j + 1]) + 1);
                strcpy(ret[j], argv[i + j + 1]);
            }
            return ret;
        }
    }
    return 0;
}

/**
 * For internal use only.
 */
bool get_option_state(int argc, char **argv, char *option)
{
    int i;
    for (i = 0; i < argc; ++i)
        if (!strcmp(argv[i], option))
            return TRUE;

    return FALSE;
}

/**
 * Taken from Vinum source -- for internal use only.
 */
long long size_spec(char *spec)
{
    u_int64_t size;
    char *s;
    int sign = 1;               /* -1 if negative */

    size = 0;
    if (spec != NULL) {         /* we have a parameter */
        s = spec;
        if (*s == '-') {        /* negative, */
            sign = -1;
            s++;                /* skip */
        }
        if ((*s >= '0') && (*s <= '9')) {   /* it's numeric */
            while ((*s >= '0') && (*s <= '9'))  /* it's numeric */
                size = size * 10 + *s++ - '0';  /* convert it */
            switch (*s) {
            case '\0':
                return size * sign;

            case 'B':
            case 'b':
            case 'S':
            case 's':
                return size * sign * 512;

            case 'K':
            case 'k':
                return size * sign * 1024;

            case 'M':
            case 'm':
                return size * sign * 1024 * 1024;

            case 'G':
            case 'g':
                return size * sign * 1024 * 1024 * 1024;

            case 'T':
            case 't':
                log_it
                    ("Ok, I'm scared... Someone did a TERABYTE+ size-spec");
                return size * sign * 1024 * 1024 * 1024 * 1024;

            case 'P':
            case 'p':
                log_it
                    ("If I was scared last time, I'm freaked out now. Someone actually has a PETABYTE?!?!?!?!");
                return size * sign * 1024 * 1024 * 1024 * 1024 * 1024;

            case 'E':
            case 'e':
                log_it
                    ("Okay, I'm REALLY freaked out. Who could devote a whole EXABYTE to their data?!?!");
                return size * sign * 1024 * 1024 * 1024 * 1024 * 1024 *
                    1024;

            case 'Z':
            case 'z':
                log_it
                    ("WHAT!?!? A ZETABYTE!?!? You've GOT to be kidding me!!!");
                return size * sign * 1024 * 1024 * 1024 * 1024 * 1024 *
                    1024 * 1024;

            case 'Y':
            case 'y':
                log_it
                    ("Oh my gosh. You actually think a YOTTABYTE will get you anywhere? What're you going to do with 1,208,925,819,614,629,174,706,176 bytes?!?!");
                popup_and_OK
                    ("That sizespec is more than 1,208,925,819,614,629,174,706,176 bytes. You have a shocking amount of data. Please send a screenshot to the list :-)");
                return size * sign * 1024 * 1024 * 1024 * 1024 * 1024 *
                    1024 * 1024 * 1024;
            }
        }
    }
    return size * sign;
}

#endif




int parse_mdstat(char *mdstat_fname, struct raidlist_itself *raidlist, char *device_prefix) {

const char delims[] = " ";

FILE *fin = NULL;
int res = 0, row, i, index_min;
int v = 0;
int lastpos = 0;
size_t len = 0;
char *token = NULL;
char *string = NULL;
char *cmd = NULL;
char *pos = NULL;
char type;
char *strtmp = NULL;
char *strtmp2 = NULL;

// open file
if (!(fin = fopen(mdstat_fname, "r"))) {
    log_msg(1, "Could not open %s.", mdstat_fname);
    return 1;
}
// initialise record, build progress and row counters
raidlist->entries = 0;
raidlist->el[raidlist->entries].progress = 999;
row = 1;
// skip first output row - contains registered RAID levels
res = getline(&strtmp2, &len, fin);
mr_free(strtmp2);
// parse the rest
while ( !feof_unlocked(fin) ) {
    res = getline(&string, &len, fin);
    log_msg(8, "mdstat line '%s' read.", string);
    if (res <= 0) break;
    // trim spaces
    strip_spaces(string);
    log_msg(8, "mdstat line 2 '%s' read.", string);
    // if we have newline after only spaces, this is a blank line, update
    // counters, otherwise do normal parsing
    if (!strcmp(string,"")) {
        row = 1;
        raidlist->entries++;
        raidlist->el[raidlist->entries].progress = 999;
    } else {
        switch (row) {
        case 1:  // device information
            // check whether last line of record and if so skip
            log_msg(8, "This is the device line");
            pos = strcasestr(string, "unused devices: ");
            if (pos != NULL) {
                break;
            }
            // tokenise string
            token = mr_strtok(string, delims, &lastpos);
            if (token == NULL) {
                // should not happen !
                break;
            }
            // get RAID device name
            mr_asprintf(strtmp,"%s%s", device_prefix, token);
            strncpy(raidlist->el[raidlist->entries].raid_device, strtmp, 63);
            raidlist->el[raidlist->entries].raid_device[63] = '\0';
            mr_free(strtmp);
            mr_free(token);
            // store the UUID value in the additional_vars structure
            v = raidlist->el[raidlist->entries].additional_vars.entries;
            strcpy(raidlist->el[raidlist->entries].additional_vars.el[v].label, "UUID");
            mr_asprintf(cmd,"mdadm --detail %s | grep UUID | cut -d: -f2- | sed 's/^ *//'", raidlist->el[raidlist->entries].raid_device);
            strtmp = call_program_and_get_last_line_of_output(cmd);
            strcpy(raidlist->el[raidlist->entries].additional_vars.el[v].value, strtmp);
            mr_free(strtmp);
            v++;
            // store the Version value in the additional_vars structure
            strcpy(raidlist->el[raidlist->entries].additional_vars.el[v].label, "Version");
            mr_asprintf(cmd,"mdadm --detail %s | grep Version | cut -d: -f2- | sed 's/^ *//'", raidlist->el[raidlist->entries].raid_device);
            strtmp = call_program_and_get_last_line_of_output(cmd);
            strcpy(raidlist->el[raidlist->entries].additional_vars.el[v].value, strtmp);
            mr_free(strtmp);
            v++;
            raidlist->el[raidlist->entries].additional_vars.entries = v;
            // skip ':' and status
            token = mr_strtok(string, delims, &lastpos);
            if (token == NULL) {
                // should not happen !
                break;
            }
            mr_free(token);
            token = mr_strtok(string, delims, &lastpos);
            if (token == NULL) {
                // should not happen !
                break;
            }
            if (!strcmp(token, "inactive")) {
                log_msg(1, "RAID device '%s' inactive.", raidlist->el[raidlist->entries].raid_device);
                mr_free(string);
                mr_free(token);
                return 1;
            }
            mr_free(token);

            // get RAID level
            token = mr_strtok(string, delims, &lastpos);
            if (token == NULL) {
                // should not happen !
                break;
            }
            // skip potential auto-read-only entry
            if (!strcmp(token, "(auto-read-only)")) {
                mr_free(token);
                token = mr_strtok (string, delims, &lastpos);
                if (token == NULL) {
                    // should not happen !
                    break;
                }
            }
            if (!strcmp(token, "multipath")) {
                raidlist->el[raidlist->entries].raid_level = -2;
            } else if (!strcmp(token, "linear")) {
                raidlist->el[raidlist->entries].raid_level = -1;
            } else if (!strcmp(token, "raid0")) {
                raidlist->el[raidlist->entries].raid_level = 0;
            } else if (!strcmp(token, "raid1")) {
                raidlist->el[raidlist->entries].raid_level = 1;
            } else if (!strcmp(token, "raid4")) {
                raidlist->el[raidlist->entries].raid_level = 4;
            } else if (!strcmp(token, "raid5")) {
                raidlist->el[raidlist->entries].raid_level = 5;
            } else if (!strcmp(token, "raid6")) {
                raidlist->el[raidlist->entries].raid_level = 6;
            } else if (!strcmp(token, "raid10")) {
                raidlist->el[raidlist->entries].raid_level = 10;
            } else {
                log_msg(1, "Unknown RAID level '%s'", token);
                mr_free(string);
                mr_free(token);
                return 1;
            }
            mr_free(token);

            // get RAID devices (type, index, device)
            // Note: parity disk for RAID4 is last normal disk, there is no '(P)'
            raidlist->el[raidlist->entries].data_disks.entries = 0;
            raidlist->el[raidlist->entries].spare_disks.entries = 0;
            raidlist->el[raidlist->entries].failed_disks.entries = 0;
            while((token = mr_strtok (string, delims, &lastpos))) {
                if ((pos = strstr(token, "("))) {
                    type = *(pos+1);
                } else {
                    type = ' ';
                }
                pos = strstr(token, "[");
                *pos = '\0';
                switch(type) {
                case ' ': // normal data disks
                    raidlist->el[raidlist->entries].data_disks.el[raidlist->el[raidlist->entries].data_disks.entries].index = atoi(pos + 1);
                    mr_asprintf(strtmp,"%s%s", device_prefix, token);
                    strcpy(raidlist->el[raidlist->entries].data_disks.el[raidlist->el[raidlist->entries].data_disks.entries].device, strtmp);
                    mr_free(strtmp);
                    raidlist->el[raidlist->entries].data_disks.entries++;
                    break;
                case 'S': // spare disks
                    raidlist->el[raidlist->entries].spare_disks.el[raidlist->el[raidlist->entries].spare_disks.entries].index = atoi(pos + 1);
                    mr_asprintf(strtmp,"%s%s", device_prefix, token);
                    strcpy(raidlist->el[raidlist->entries].spare_disks.el[raidlist->el[raidlist->entries].spare_disks.entries].device, strtmp);
                    mr_free(strtmp);
                    raidlist->el[raidlist->entries].spare_disks.entries++;
                    break;
                case 'F': // failed disks
                    raidlist->el[raidlist->entries].failed_disks.el[raidlist->el[raidlist->entries].failed_disks.entries].index = atoi(pos + 1);
                    mr_asprintf(strtmp,"%s%s", device_prefix, token);
                    strcpy(raidlist->el[raidlist->entries].failed_disks.el[raidlist->el[raidlist->entries].failed_disks.entries].device, strtmp);
                    mr_free(strtmp);
                    raidlist->el[raidlist->entries].failed_disks.entries++;
                    log_it("At least one failed disk found in RAID array.\n");
                    break;
                default: // error
                    log_msg(1, "Unknown device type '%c'", type);
                    mr_free(string);
                    mr_free(token);
                    return 1;
                    break;
                }
                mr_free(token);
            }

            // adjust index for each device so that it starts with 0 for every type
            index_min = 99;
            for (i=0; i<raidlist->el[raidlist->entries].data_disks.entries;i++) {
                if (raidlist->el[raidlist->entries].data_disks.el[i].index < index_min) {
                    index_min = raidlist->el[raidlist->entries].data_disks.el[i].index;
                }
            }
            if (index_min > 0) {
                for (i=0; i<raidlist->el[raidlist->entries].data_disks.entries;i++) {
                    raidlist->el[raidlist->entries].data_disks.el[i].index = raidlist->el[raidlist->entries].data_disks.el[i].index - index_min;    
                }
            }
            index_min = 99;
            for (i=0; i<raidlist->el[raidlist->entries].spare_disks.entries;i++) {
                if (raidlist->el[raidlist->entries].spare_disks.el[i].index < index_min) {
                    index_min = raidlist->el[raidlist->entries].spare_disks.el[i].index;
                }
            }
            if (index_min > 0) {
                for (i=0; i<raidlist->el[raidlist->entries].spare_disks.entries;i++) {
                        raidlist->el[raidlist->entries].spare_disks.el[i].index = raidlist->el[raidlist->entries].spare_disks.el[i].index - index_min;  
                }
            }
            index_min = 99;
            for (i=0; i<raidlist->el[raidlist->entries].failed_disks.entries;i++) {
                if (raidlist->el[raidlist->entries].failed_disks.el[i].index < index_min) {
                    index_min = raidlist->el[raidlist->entries].failed_disks.el[i].index;
                }
            }
            if (index_min > 0) {
                for (i=0; i<raidlist->el[raidlist->entries].failed_disks.entries;i++) {
                        raidlist->el[raidlist->entries].failed_disks.el[i].index = raidlist->el[raidlist->entries].failed_disks.el[i].index - index_min;    
                }
            }
            break;
        case 2:  // config information
            // check for persistent super block
            if (strcasestr(string, "super non-persistent")) {
                raidlist->el[raidlist->entries].persistent_superblock = 0;
            } else {
                raidlist->el[raidlist->entries].persistent_superblock = 1;
            }
            // extract chunk size
            if (!(pos = strcasestr(string, "k chunk"))) {
                raidlist->el[raidlist->entries].chunk_size = -1;
            } else {
                while (*pos != ' ') {
                    pos -= 1;
                    if (pos < string) {
                        log_it("String underflow!\n");
                        mr_free(string);
                        return 1;
                    }
                }
                raidlist->el[raidlist->entries].chunk_size = atoi(pos + 1);
            }
            // extract parity if present
            if ((pos = strcasestr(string, "algorithm"))) {
                raidlist->el[raidlist->entries].parity = atoi(pos + 9);
            } else {
                raidlist->el[raidlist->entries].parity = -1;
            }
            break;
        case 3:  // optional build status information
            if (!(pos = strchr(string, '\%'))) {
                if (strcasestr(string, "delayed")) {
                    raidlist->el[raidlist->entries].progress = -1;  // delayed (therefore, stuck at 0%)
                } else {
                    raidlist->el[raidlist->entries].progress = 999; // not found
                }
            } else {
                while (*pos != ' ') {
                    pos -= 1;
                    if (pos < string) {
                        printf("ERROR: String underflow!\n");
                        mr_free(string);
                        return 1;
                    }
                }
                raidlist->el[raidlist->entries].progress = atoi(pos);
            }
            break;
        default: // error or IN PROGRESS
            if (raidlist->el[raidlist->entries].progress != -1 &&
                raidlist->el[raidlist->entries].progress != 999) {
                log_msg(1, "Row %d should not occur in record!", row);
            }
            break;
        }
    row++;
    }
    // free string
    mr_free(string);
}
// close file
fclose(fin);
// return success
return 0;

}




int create_raidtab_from_mdstat(char *mdstat_fname,char *raidtab_fname)
{
    struct raidlist_itself *raidlist;
    int retval = 0;

    raidlist = malloc(sizeof(struct raidlist_itself));

    // FIXME: Prefix '/dev/' should really be dynamic!
    if (parse_mdstat(mdstat_fname,raidlist, "/dev/")) {
        log_to_screen("Sorry, cannot read %s", mdstat_fname);
        return (1);
    }

    retval += save_raidlist_to_raidtab(raidlist, raidtab_fname);
    return (retval);
}



/* @} - end of raidGroup */