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raid: ensure area_count is at least 2

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Enusure we will not divide by 0.
This commit is contained in:
Zdenek Kabelac 2015-11-13 10:59:58 +01:00
parent d74e1291cd
commit 007be91e3d
1 changed files with 7 additions and 2 deletions
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9
lib/metadata/raid_manip.c
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@ -460,9 +460,14 @@ static int _alloc_image_components(struct logical_volume *lv,
* individual devies, we must specify how large the individual device
* is along with the number we want ('count').
*/
if (segtype_is_raid10(segtype))
if (segtype_is_raid10(segtype)) {
if (seg->area_count < 2) {
log_error(INTERNAL_ERROR "LV %s needs at least 2 areas.",
display_lvname(lv));
return 0;
}
extents = lv->le_count / (seg->area_count / 2); /* we enforce 2 mirrors right now */
else
} else
extents = (segtype->parity_devs) ?
(lv->le_count / (seg->area_count - segtype->parity_devs)) :
lv->le_count;