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metadata: add extents_from_percent_size

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Add API call to calculate extents from percentage value.
Size is based in DM_PERCENT_1 units.
(Supporting decimal point number).
This commit is preparing functionality for more global
usage of % with i.e. --size option.
This commit is contained in:
Zdenek Kabelac 2014-10-30 23:43:12 +01:00
parent 375d7f1c2d
commit 8bf4cd464f
2 changed files with 64 additions and 0 deletions
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3
lib/metadata/metadata-exported.h
View File

@ -733,6 +733,9 @@ int lv_update_and_reload_origin(struct logical_volume *lv);
uint64_t extents_from_size(struct cmd_context *cmd, uint64_t size,
uint32_t extent_size);
uint32_t extents_from_percent_size(struct volume_group *vg, const struct dm_list *pvh,
uint32_t extents, int roundup,
percent_type_t percent, uint64_t size);
struct logical_volume *find_pool_lv(const struct logical_volume *lv);
int pool_is_active(const struct logical_volume *pool_lv);

61
lib/metadata/metadata.c
View File

@ -1097,6 +1097,67 @@ uint64_t extents_from_size(struct cmd_context *cmd, uint64_t size,
return size / extent_size;
}
/*
* Converts size according to percentage with specified rounding to extents
*
* For PERCENT_NONE size is in standard sector units.
* For all other percent type is in DM_PERCENT_1 base unit (supports decimal point)
*
* Return value of 0 extents is an error.
*/
uint32_t extents_from_percent_size(struct volume_group *vg, const struct dm_list *pvh,
uint32_t extents, int roundup,
percent_type_t percent, uint64_t size)
{
uint32_t count;
switch (percent) {
case PERCENT_NONE:
if (!roundup && (size % vg->extent_size)) {
if (!(size -= size % vg->extent_size)) {
log_error("Specified size is smaller then physical extent boundary.");
return 0;
}
log_print_unless_silent("Rounding size to boundary between physical extents: %s.",
display_size(vg->cmd, size));
}
return extents_from_size(vg->cmd, size, vg->extent_size);
case PERCENT_LV:
break; /* Base extents already passed in. */
case PERCENT_VG:
extents = vg->extent_count;
break;
case PERCENT_PVS:
if (pvh != &vg->pvs) {
/* Physical volumes are specified on cmdline */
if (!(extents = pv_list_extents_free(pvh))) {
log_error("No free extents in the list of physical volumes.");
return 0;
}
break;
}
/* Fall back to use all PVs in VG like %FREE */
case PERCENT_FREE:
if (!(extents = vg->free_count)) {
log_error("No free extents in Volume group %s.", vg->name);
return 0;
}
break;
default:
log_error(INTERNAL_ERROR "Unsupported percent type %u.", percent);
return 0;
}
if (!(count = percent_of_extents(size, extents, roundup)))
log_error("Converted %.2f%%%s into 0 extents.",
(double) size / DM_PERCENT_1, get_percent_string(percent));
else
log_verbose("Converted %.2f%%%s into %" PRIu32 " extents.",
(double) size / DM_PERCENT_1, get_percent_string(percent), count);
return count;
}
static dm_bitset_t _bitset_with_random_bits(struct dm_pool *mem, uint32_t num_bits,
uint32_t num_set_bits, unsigned *seed)
{