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lvextend: improve percentage estimation

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Correcting rounding rules for percentage evaluation.

Validate supported range of percentage.
(although ranges are already validated earlier on code path)
This commit is contained in:
Zdenek Kabelac 2020-09-10 22:38:34 +02:00
parent 6d392776b0
commit e7f5acdfa6
2 changed files with 3 additions and 2 deletions
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1
WHATS_NEW
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@ -1,5 +1,6 @@
Version 2.03.11 -
==================================
Enhance --use-policy percentage rounding.
Configure --with-vdo and --with-writecache as internal segments.
Improving VDO man page examples.
Switch code base to use flexible array syntax.

4
lib/metadata/lv_manip.c
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@ -4932,7 +4932,7 @@ static int _fsadm_cmd(enum fsadm_cmd_e fcmd,
static uint32_t _adjust_amount(dm_percent_t percent, int policy_threshold, int policy_amount)
{
if (!(DM_PERCENT_0 < percent && percent <= DM_PERCENT_100) ||
if (!((50 * DM_PERCENT_1) < percent && percent <= DM_PERCENT_100) ||
percent <= (policy_threshold * DM_PERCENT_1))
return 0; /* nothing to do */
/*
@ -4940,7 +4940,7 @@ static uint32_t _adjust_amount(dm_percent_t percent, int policy_threshold, int p
* Keep using DM_PERCENT_1 units for better precision.
* Round-up to needed percentage value
*/
percent = (percent / policy_threshold + (DM_PERCENT_1 - 1) / 100) / (DM_PERCENT_1 / 100) - 100;
percent = ((percent + policy_threshold - 1) / policy_threshold) / (DM_PERCENT_1 / 100) - 100;
/* Use it if current policy amount is smaller */
return (policy_amount < percent) ? (uint32_t) percent : (uint32_t) policy_amount;