thin_metadata_size: support long unit specifiers; make sure exit_prg() is being called; update manual page
This commit is contained in:
Heinz Mauelshagen
parent
e4912f548c
commit
03d2ca3a99
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@ -10,7 +10,9 @@ thin_metadata_size \- thin provisioning metadata file/device size calculator.
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.B thin_metadata_size
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calculates the size of the thin provisioning metadata based on the block size
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of the thin provisioned devices, the size of the thin provisioning pool and
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the maximum number of all thin prisioned devices and snapshots.
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the maximum number of all thin prisioned devices and snapshots. Size/number
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option arguments can be followed by unit specifiers in short one character
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and long form (eg. -b1m or -b1megabytes).
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.IP "\fB\-b, \-\-block-size\fP \fIBLOCKSIZE[bskKmMgGtTpPeEzZyY]\fP"
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Block size of thin provisioned devices in units of bytes,sectors,kilobytes,kibibytes,... respectively.
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@ -33,11 +33,11 @@
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/*----------------------------------------------------------------*/
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static char *prg; /* program name */
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enum numeric_options { BLOCKSIZE, POOLSIZE, MAXTHINS, NUMERIC, OPT_END};
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enum return_units { RETURN_BYTES, RETURN_SECTORS };
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struct global {
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char *prg; /* program name */
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#define UNIT_ARRAY_SZ 18
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struct {
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char *chars;
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@ -46,88 +46,132 @@ struct global {
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} unit;
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struct options {
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unsigned long long n[OPT_END];
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char *unit;
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char *s[OPT_END];
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char unit;
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unsigned long long n[OPT_END];
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} options;
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};
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#define bytes_per_sector g->unit.factors[1]
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static struct global *init_prg(void)
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static void exit_prg(struct global *g, int ret)
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{
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if (g) {
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unsigned u;
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if (g->options.unit)
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free(g->options.unit);
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for (u = OPT_END; u--; ) {
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if (g->options.s[u])
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free(g->options.s[u]);
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}
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free(g);
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}
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exit(ret);
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}
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static void abort_prg(struct global *g, const char *msg)
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{
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fprintf(stderr, "%s - %s\n", g->prg, msg);
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exit_prg(g, 1);
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}
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static struct global *init_prg(char *prg_path)
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{
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unsigned u = 0;
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static struct global r;
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static char *unit_strings[] = { "bytes", "sectors",
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"kilobytes", "kibibytes", "megabytes", "mebibytes",
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"gigabytes", "gibibytes", "terabytes", "tebibytes",
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"petabytes", "pebibytes", "exabytes", "ebibytes",
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"zetabytes", "zebibytes", "yottabytes", "yobibytes" };
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struct global *r = malloc(sizeof(*r));
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memset(&r, 0, sizeof(r));
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r.unit.chars = "bskKmMgGtTpPeEzZyY";
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r.unit.factors[u++] = 1;
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r.unit.factors[u++] = 512;
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r.unit.factors[u++] = 1024;
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r.unit.factors[u++] = 1000;
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if (!r)
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abort_prg(r, "failed to allocate global context!");
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memset(r, 0, sizeof(*r));
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r->prg = basename(prg_path);
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r->unit.chars = "bskKmMgGtTpPeEzZyY";
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r->unit.factors[u++] = 1;
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r->unit.factors[u++] = 512;
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r->unit.factors[u++] = 1024;
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r->unit.factors[u++] = 1000;
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for ( ; u < UNIT_ARRAY_SZ; u += 2) {
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r.unit.factors[u] = r.unit.factors[2] * r.unit.factors[u - 2];
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r.unit.factors[u+1] = r.unit.factors[3] * r.unit.factors[u - 1];
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r->unit.factors[u] = r->unit.factors[2] * r->unit.factors[u - 2];
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r->unit.factors[u+1] = r->unit.factors[3] * r->unit.factors[u - 1];
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}
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for (u = UNIT_ARRAY_SZ; u--; )
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r.unit.strings[u] = unit_strings[u];
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r->unit.strings[u] = unit_strings[u];
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r.options.unit = 's';
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return &r;
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return r;
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}
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#define bytes_per_sector(g) (g)->unit.factors[1]
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static void exit_prg(struct global *g)
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static int get_index(struct global *g, char *unit_string)
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{
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unsigned u;
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unsigned len, u;
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for (u = OPT_END; u--; ) {
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if (g->options.s[u])
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free(g->options.s[u]);
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if (!unit_string)
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return get_index(g, "sectors");
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len = strlen(unit_string);
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if (len == 1) {
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char *o = strchr(g->unit.chars, *unit_string);
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if (o)
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return o - g->unit.chars;
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} else {
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for (u = UNIT_ARRAY_SZ; u--; )
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if (!strncmp(g->unit.strings[u], unit_string, len))
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return u;
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}
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return -1;
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}
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static unsigned get_index(struct global *g, char unit_char)
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static void check_opts(struct global *g)
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{
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char *o = strchr(g->unit.chars, unit_char);
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struct options *o = &g->options;
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return o ? o - g->unit.chars : 1;
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if (!o->n[BLOCKSIZE] || !o->n[POOLSIZE] || !o->n[MAXTHINS])
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abort_prg(g, "3 arguments required!");
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else if (o->n[BLOCKSIZE] & (o->n[BLOCKSIZE] - 1))
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abort_prg(g, "block size must be 2^^N");
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else if (o->n[POOLSIZE] <= o->n[BLOCKSIZE])
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abort_prg(g, "POOLSIZE must be larger than BLOCKSIZE");
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else if (!o->n[MAXTHINS])
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abort_prg(g, "maximum number of thin provisioned devices must be > 0");
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}
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static void abort_prg(const char *msg)
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static unsigned long long to_bytes(struct global *g, char *sz, enum return_units unit, int *index)
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{
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fprintf(stderr, "%s - %s\n", prg, msg);
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exit(1);
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}
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static void check_opts(struct options *options)
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{
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if (!options->n[BLOCKSIZE] || !options->n[POOLSIZE] || !options->n[MAXTHINS])
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abort_prg("3 arguments required!");
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else if (options->n[BLOCKSIZE] & (options->n[BLOCKSIZE] - 1))
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abort_prg("block size must be 2^^N");
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else if (options->n[POOLSIZE] < options->n[BLOCKSIZE])
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abort_prg("POOLSIZE must be much larger than BLOCKSIZE");
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else if (!options->n[MAXTHINS])
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abort_prg("maximum number of thin provisioned devices must be > 0");
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}
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static unsigned long long to_bytes(struct global *g, char *sz, enum return_units unit)
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{
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unsigned len = strlen(sz);
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int idx;
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unsigned long long r;
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char uc = 's', *us = strchr(g->unit.chars, sz[len-1]);
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char *us;
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if (us)
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uc = *us, sz[len-1] = 0;
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for (us = sz; *us; us++) {
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if (!isdigit(*us))
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break;
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}
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r = atoll(sz) * g->unit.factors[get_index(g, uc)];
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return (!us || unit == RETURN_SECTORS) ? r / bytes_per_sector : r;
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if (*us) {
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idx = get_index(g, us);
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if (idx < 0)
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abort_prg(g, "Invalid unit specifier!");
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*us = 0;
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*index = idx;
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} else {
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idx = get_index(g, NULL);
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us = NULL;
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*index = -1;
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}
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r = atoll(sz) * g->unit.factors[idx];
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return (!us || unit == RETURN_SECTORS) ? r / bytes_per_sector(g) : r;
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}
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static void printf_aligned(struct global *g, char *a, char *b, char *c, int units)
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@ -143,7 +187,7 @@ static void printf_aligned(struct global *g, char *a, char *b, char *c, int unit
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static void help(struct global *g)
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{
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printf ("Thin Provisioning Metadata Device Size Calculator.\nUsage: %s [options]\n", prg);
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printf ("Thin Provisioning Metadata Device Size Calculator.\nUsage: %s [options]\n", g->prg);
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printf_aligned(g, "-b", "--block-size BLOCKSIZE", "Block size of thin provisioned devices.", 1);
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printf_aligned(g, "-s", "--pool-size SIZE", "Size of pool device.", 1);
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printf_aligned(g, "-m", "--max-thins #MAXTHINS", "Maximum sum of all thin devices and snapshots.", 1);
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@ -151,44 +195,54 @@ static void help(struct global *g)
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printf_aligned(g, "-n", "--numeric-only[=unit]", "Output numeric value only (optionally with unit identifier).", 0);
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printf_aligned(g, "-h", "--help", "This help.", 0);
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printf_aligned(g, "-V", "--version", "Print thin provisioning tools version.", 0);
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exit(0);
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exit_prg(g, 0);
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}
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static void version(struct global *g)
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{
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printf("%s\n", THIN_PROVISIONING_TOOLS_VERSION);
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exit_prg(g, 1);
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}
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static void check_unit(struct global *g, char *arg)
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{
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if (*(arg + 1))
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abort_prg("only one unit specifier character allowed!");
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else if (!strchr(g->unit.chars, *arg))
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abort_prg("output unit specifier character invalid!");
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if (get_index(g, arg) < 0)
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abort_prg(g, "output unit specifier invalid!");
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g->options.unit = *arg;
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g->options.unit = strdup(arg);
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}
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static void check_numeric_option(struct global *g, char *arg)
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{
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if (g->options.n[NUMERIC])
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abort_prg("-n already given!");
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abort_prg(g, "-n already given!");
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g->options.n[NUMERIC] = 1;
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if (arg) {
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if (!*arg || strncmp("unit", arg, strlen(arg)))
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abort_prg("-n invalid option argument");
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abort_prg(g, "-n invalid option argument");
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g->options.n[NUMERIC]++;
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}
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}
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static void check_size(struct global *g, enum numeric_options o, enum return_units unit, char *arg)
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static void check_size(struct global *g, enum numeric_options o, char *arg)
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{
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int idx;
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if (g->options.n[o])
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abort_prg("option already given!");
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abort_prg(g, "option already given!");
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g->options.s[o] = strdup(arg);
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g->options.n[o] = to_bytes(g, arg, o == MAXTHINS ? RETURN_BYTES : RETURN_SECTORS, &idx);
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g->options.s[o] = malloc(strlen(arg) + (idx > -1) ? strlen(g->unit.strings[idx]) : 0 + 1);
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if (!g->options.s[o])
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abort_prg("failed to allocate string!");
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abort_prg(g, "failed to allocate string!");
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strcpy(g->options.s[o], arg);
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if (idx > -1)
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strcat(g->options.s[o], g->unit.strings[idx]);
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g->options.n[o] = to_bytes(g, arg, unit);
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}
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static void parse_command_line(struct global *g, int argc, char **argv)
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@ -206,26 +260,32 @@ static void parse_command_line(struct global *g, int argc, char **argv)
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};
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while ((c = getopt_long(argc, argv, "b:s:m:u:n::hV", long_options, NULL)) != -1) {
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if (c == 'b')
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check_size(g, BLOCKSIZE, RETURN_SECTORS, optarg);
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else if (c == 's')
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check_size(g, POOLSIZE, RETURN_SECTORS, optarg);
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else if (c == 'm')
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check_size(g, MAXTHINS, RETURN_BYTES, optarg);
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else if (c == 'u')
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switch (c) {
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case 'b':
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check_size(g, BLOCKSIZE, optarg);
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break;
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case 's':
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check_size(g, POOLSIZE, optarg);
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break;
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case 'm':
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check_size(g, MAXTHINS, optarg);
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break;
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case 'u':
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check_unit(g, optarg);
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else if (c == 'n')
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break;
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case 'n':
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check_numeric_option(g, optarg);
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else if (c == 'h')
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help(g);
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else if (c == 'V') {
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printf("%s\n", THIN_PROVISIONING_TOOLS_VERSION);
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exit(0);
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} else
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abort_prg("Invalid option!");
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break;
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case 'h':
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help(g); /* exits */
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case 'V':
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version(g); /* exits */
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default:
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abort_prg(g, "Invalid option!");
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}
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}
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check_opts(&g->options);
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check_opts(g);
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}
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static const unsigned mappings_per_block(void)
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@ -246,7 +306,7 @@ static void printf_precision(struct global *g, double r, unsigned idx)
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if (full)
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printf("%s - estimated metadata area size [blocksize=%s,poolsize=%s,maxthins=%s] is ",
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prg, g->options.s[BLOCKSIZE], g->options.s[POOLSIZE], g->options.s[MAXTHINS]);
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g->prg, g->options.s[BLOCKSIZE], g->options.s[POOLSIZE], g->options.s[MAXTHINS]);
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if (r == rtrunc)
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printf("%llu", (unsigned long long) r);
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@ -267,7 +327,7 @@ static void print_estimated_result(struct global *g)
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double r;
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/* double-fold # of nodes, because they aren't fully populated in average */
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r = (1.0 + (2 * g->options.n[POOLSIZE] / g->options.n[BLOCKSIZE] / mappings_per_block() + g->options.n[MAXTHINS])) * 8 * bytes_per_sector; /* in bytes! */
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r = (1.0 + (2 * g->options.n[POOLSIZE] / g->options.n[BLOCKSIZE] / mappings_per_block() + g->options.n[MAXTHINS])) * 8 * bytes_per_sector(g); /* in bytes! */
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r /= g->unit.factors[idx]; /* in requested unit */
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printf_precision(g, r, idx);
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@ -275,11 +335,10 @@ static void print_estimated_result(struct global *g)
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int main(int argc, char **argv)
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{
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struct global *g = init_prg();
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struct global *g = init_prg(*argv);
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prg = basename(argv[0]);
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parse_command_line(g, argc, argv);
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print_estimated_result(g);
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exit_prg(g);
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return 0;
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exit_prg(g, 0);
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return 0; /* Doesn't get here... */
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}
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