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libdm: split off internal _stats_delete_region()

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Split dm_stats_delete_region() so that internal callers can manage
the handle state themselves.

dm_stats_delete_region() now just handles checking the state of the
handle, reporting validation errors, and calling dm_stats_list() if
necessary, before calling _stats_delete_region().

The new _stats_delete_region() function performs the actual group
member removal and region deletion, and requires a fully listed
handle to operate.

Callers that repeatedly delete regions can use a single listed
handle for many operations on the same device, avoiding one
message ioctl per region deleted: since @stats_list with many
regions is expensive, this yields large runtime improvements.
This commit is contained in:
Bryn M. Reeves 2016-12-09 22:58:25 +00:00
parent c459f23565
commit 97c4490cc5
1 changed files with 26 additions and 17 deletions
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43
libdm/libdm-stats.c
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@ -2018,10 +2018,34 @@ static int _stats_remove_region_id_from_group(struct dm_stats *dms,
return _stats_set_aux(dms, group_id, dms->regions[group_id].aux_data);
}
int dm_stats_delete_region(struct dm_stats *dms, uint64_t region_id)
static int _stats_delete_region(struct dm_stats *dms, uint64_t region_id)
{
char msg[STATS_MSG_BUF_LEN];
struct dm_task *dmt;
if (_stats_region_is_grouped(dms, region_id))
if (!_stats_remove_region_id_from_group(dms, region_id)) {
log_error("Could not remove region ID " FMTu64 " from "
"group ID " FMTu64,
region_id, dms->regions[region_id].group_id);
return 0;
}
if (!dm_snprintf(msg, sizeof(msg), "@stats_delete " FMTu64, region_id)) {
log_error("Could not prepare @stats_delete message.");
return 0;
}
dmt = _stats_send_message(dms, msg);
if (!dmt)
return_0;
dm_task_destroy(dmt);
return 1;
}
int dm_stats_delete_region(struct dm_stats *dms, uint64_t region_id)
{
int listed = 0;
if (!_stats_bound(dms))
@ -2065,23 +2089,8 @@ int dm_stats_delete_region(struct dm_stats *dms, uint64_t region_id)
goto bad;
}
if(_stats_region_is_grouped(dms, region_id))
if (!_stats_remove_region_id_from_group(dms, region_id)) {
log_error("Could not remove region ID " FMTu64 " from "
"group ID " FMTu64,
region_id, dms->regions[region_id].group_id);
goto bad;
}
if (!dm_snprintf(msg, sizeof(msg), "@stats_delete " FMTu64, region_id)) {
log_error("Could not prepare @stats_delete message.");
if (!_stats_delete_region(dms, region_id))
goto bad;
}
dmt = _stats_send_message(dms, msg);
if (!dmt)
return_0;
dm_task_destroy(dmt);
if (!listed)
/* wipe region and mark as not present */