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raid_manip: Some validation functions.

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This commit is contained in:
Alasdair G Kergon 2016-07-24 01:40:24 +01:00
parent ea543b5c6f
commit 3bc1adc404
1 changed files with 60 additions and 1 deletions
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61
lib/metadata/raid_manip.c
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@ -33,6 +33,40 @@ static int _check_restriping(uint32_t new_stripes, struct logical_volume *lv)
return 1;
}
/* Check that all lv has segments have exactly the required number of areas */
static int _check_num_areas_in_lv_segments(struct logical_volume *lv, unsigned num_areas)
{
struct lv_segment *seg;
dm_list_iterate_items(seg, &lv->segments)
if (seg->area_count != num_areas) {
log_error("For this operation LV %s needs exactly %u data areas per segment.",
display_lvname(lv), num_areas);
return 0;
}
return 1;
}
/* Ensure region size exceeds the minimum for lv */
static void _ensure_min_region_size(const struct logical_volume *lv)
{
struct lv_segment *seg = first_seg(lv);
uint32_t min_region_size, region_size;
/* MD's bitmap is limited to tracking 2^21 regions */
min_region_size = lv->size / (1 << 21);
region_size = seg->region_size;
while (region_size < min_region_size)
region_size *= 2;
if (seg->region_size != region_size) {
log_very_verbose("Setting region_size to %u for %s", seg->region_size, display_lvname(lv));
seg->region_size = region_size;
}
}
/*
* Check for maximum number of raid devices.
* Constrained by kernel MD maximum device limits _and_ dm-raid superblock
@ -41,13 +75,38 @@ static int _check_restriping(uint32_t new_stripes, struct logical_volume *lv)
static int _check_max_raid_devices(uint32_t image_count)
{
if (image_count > DEFAULT_RAID_MAX_IMAGES) {
log_error("Unable to handle arrays with more than %u devices",
log_error("Unable to handle raid arrays with more than %u devices",
DEFAULT_RAID_MAX_IMAGES);
return 0;
}
return 1;
}
static int _check_max_mirror_devices(uint32_t image_count)
{
if (image_count > DEFAULT_MIRROR_MAX_IMAGES) {
log_error("Unable to handle mirrors with more than %u devices",
DEFAULT_MIRROR_MAX_IMAGES);
return 0;
}
return 1;
}
/*
* Fix up LV region_size if not yet set.
*/
/* FIXME Check this happens exactly once at the right place. */
static void _check_and_adjust_region_size(const struct logical_volume *lv)
{
struct lv_segment *seg = first_seg(lv);
seg->region_size = seg->region_size ? : get_default_region_size(lv->vg->cmd);
return _ensure_min_region_size(lv);
}
static int _lv_is_raid_with_tracking(const struct logical_volume *lv,
struct logical_volume **tracking)
{