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dmstats: group regions by default with --segments

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Grouping is also useful in combination with --segments: creating a
group allows both individual segment data and data for the device
as a whole to be presented in the same report.

Support grouping for 'create --segments' in the same manner as for
'create --filemap'; group regions by default, applying an optional
alias specified with --alias, unless the user specifies --nogroup.
This commit is contained in:
Bryn M. Reeves 2016-07-07 13:53:06 +01:00
parent db63587ce2
commit bd1f4987eb
1 changed files with 76 additions and 7 deletions
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83
tools/dmsetup.c
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@ -4768,6 +4768,56 @@ static uint64_t _nr_areas_from_step(uint64_t len, int64_t step)
return (len / step) + !!(len % (uint64_t) step);
}
/* maximum length of a string representation of an integer */
#define max_int_strlen(i) (strlen(#i))
#define MAX_UINT64_STRLEN max_int_strlen(UINT64_MAX)
static int _stats_group_segments(struct dm_stats *dms, uint64_t *region_ids,
int count, const char *alias)
{
/* NULL, commas, and count * region_id */
size_t bufsize = 1 + count + count * MAX_UINT64_STRLEN;
char *this_region, *regions = NULL;
uint64_t group_id;
int r, i;
this_region = regions = dm_malloc(bufsize);
if (!regions) {
log_error("Could not allocate memory for region_id table.");
return 0;
}
for (i = 0; i < count; i++) {
/*
* We don't expect large numbers of segments (compared to e.g.
* --filemap): use a fixed-size buffer based on the number of
* region identifiers and do not collapse continuous ranges
* of identifiers in the group descriptor argument.
*/
r = dm_snprintf(this_region, bufsize, FMTu64 "%s", region_ids[i],
(i < (count - 1)) ? "," : "");
if (r < 0)
goto_bad;
this_region += r;
bufsize -= r;
}
/* refresh handle */
if (!(r = dm_stats_list(dms, NULL)))
goto bad;
if ((r = dm_stats_create_group(dms, regions, alias, &group_id)))
printf("Grouped regions %s as group ID " FMTu64 "%s%s\n",
regions, group_id, (alias) ? " with alias " : "",
(alias) ? : "");
else
log_error("Failed to create group for regions %s", regions);
bad:
dm_free(regions);
return r;
}
/*
* Create a single region starting at start and spanning len sectors,
* or, if the segments argument is no-zero create one region for each
@ -4784,8 +4834,9 @@ static int _do_stats_create_regions(struct dm_stats *dms,
{
uint64_t this_start = 0, this_len = len, region_id = UINT64_C(0);
const char *devname = NULL, *histogram = _string_args[BOUNDS_ARG];
int r = 0, precise = _switches[PRECISE_ARG];
int r = 0, count = 0, precise = _switches[PRECISE_ARG];
struct dm_histogram *bounds = NULL; /* histogram bounds */
uint64_t *region_ids = NULL; /* segments */
char *target_type, *params; /* unused */
struct dm_task *dmt;
struct dm_info info;
@ -4794,6 +4845,12 @@ static int _do_stats_create_regions(struct dm_stats *dms,
if (histogram && !(bounds = dm_histogram_bounds_from_string(histogram)))
return_0;
if (_switches[ALIAS_ARG] && _switches[NOGROUP_ARG]) {
log_error("Cannot set alias with --nogroup.");
dm_stats_destroy(dms);
return 0;
}
if (!(dmt = dm_task_create(DM_DEVICE_TABLE))) {
dm_histogram_bounds_destroy(bounds);
dm_stats_destroy(dms);
@ -4818,6 +4875,11 @@ static int _do_stats_create_regions(struct dm_stats *dms,
if (!(devname = dm_task_get_name(dmt)))
goto_out;
if (!segments || (info.target_count == 1))
region_ids = &region_id;
else
region_ids = dm_malloc(info.target_count * sizeof(*region_ids));
do {
uint64_t segment_start, segment_len;
next = dm_get_next_target(dmt, next, &segment_start, &segment_len,
@ -4838,10 +4900,10 @@ static int _do_stats_create_regions(struct dm_stats *dms,
*/
this_start = (segments) ? segment_start : start;
this_len = (segments) ? segment_len : this_len;
if (!dm_stats_create_region(dms, &region_id,
this_start, this_len, step,
precise, bounds,
program_id, user_data)) {
if (!(r = dm_stats_create_region(dms, &region_ids[count],
this_start, this_len, step,
precise, bounds,
program_id, user_data))) {
log_error("%s: Could not create statistics region.",
devname);
goto out;
@ -4849,12 +4911,19 @@ static int _do_stats_create_regions(struct dm_stats *dms,
printf("%s: Created new region with "FMTu64" area(s) as "
"region ID "FMTu64"\n", devname,
_nr_areas_from_step(this_len, step), region_id);
_nr_areas_from_step(this_len, step),
region_ids[count++]);
}
} while (next);
r = 1;
if (!_switches[NOGROUP_ARG] && segments)
r = _stats_group_segments(dms, region_ids, count,
_string_args[ALIAS_ARG]);
out:
if (region_ids != &region_id)
dm_free(region_ids);
dm_task_destroy(dmt);
dm_stats_destroy(dms);
dm_histogram_bounds_destroy(bounds);