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From e4bf9b823452c0b98b394b8abcc67f887b6991b3 Mon Sep 17 00:00:00 2001
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From: Petr Uzel <petr.uzel@suse.cz>
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Date: Thu, 21 Jul 2016 16:46:46 +0200
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Subject: [PATCH 44/53] libparted: only IEC units are treated as exact
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If the user specifies start/end of the partition as a unit,
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whose size happens to be power of two, we treat that as
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exact address with exact placement.
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Recently, commit 01900e056ec25083 added an exception for
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percent units.
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This logic however can fail also for cylinders, e.g. on DASD FBA disks,
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which report CHS=(*, 128, 16) geometry, hence once cylinder is 1 MiB.
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With cylinders as units, exact placement is not what the user wants.
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Instead of adding cylinders to the blacklist, let's instead
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whitelist units which should trigger exact placement.
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* libparted/unit.c (is_power_of_2): Remove now unused function.
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(ped_unit_parse_custom): Specify which units trigger exact placement.
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* NEWS (Bug Fixes): Mention this.
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(cherry picked from commit f4f38082fc4dbf0c28ccc7613c672fe279d3032e)
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---
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libparted/unit.c | 33 +++++++++++++++++----------------
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1 file changed, 17 insertions(+), 16 deletions(-)
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diff --git a/libparted/unit.c b/libparted/unit.c
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index dddb5db..e47e868 100644
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--- a/libparted/unit.c
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+++ b/libparted/unit.c
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@@ -481,12 +481,6 @@ parse_unit_suffix (const char* suffix, PedUnit suggested_unit)
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return suggested_unit;
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}
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-static bool
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-is_power_of_2 (long long n)
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-{
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- return (n & (n - 1)) == 0;
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-}
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-
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/**
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* If \p str contains a valid description of a location on \p dev, then
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* \p *sector is modified to describe the location and a geometry is created
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@@ -540,16 +534,23 @@ ped_unit_parse_custom (const char* str, const PedDevice* dev, PedUnit unit,
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}
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unit_size = ped_unit_get_size (dev, unit);
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- radius = (ped_div_round_up (unit_size, dev->sector_size) / 2) - 1;
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- if (radius < 0)
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- radius = 0;
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- /* If the user specifies units in a power of 2, e.g., 4MiB, as in
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- parted -s -- $dev mklabel gpt mkpart P-NAME 4MiB -34s
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- do not use 4MiB as the range. Rather, presume that they
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- are specifying precisely the starting or ending number,
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- and treat "4MiB" just as we would treat "4194304B". */
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- if (is_power_of_2 (unit_size) && unit != PED_UNIT_PERCENT)
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- radius = 0;
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+ switch (unit) {
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+ /* If the user specifies the address using IEC units e.g., 4MiB, as in
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+ parted -s -- $dev mklabel gpt mkpart P-NAME 4MiB -34s
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+ do not use size of the unit as the range. Rather, presume that they
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+ are specifying precisely the starting or ending number,
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+ and treat "4MiB" just as we would treat "4194304B". */
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+ case PED_UNIT_KIBIBYTE:
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+ case PED_UNIT_MEBIBYTE:
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+ case PED_UNIT_GIBIBYTE:
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+ case PED_UNIT_TEBIBYTE:
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+ radius = 0;
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+ break;
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+ default:
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+ radius = (ped_div_round_up (unit_size, dev->sector_size) / 2) - 1;
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+ if (radius < 0)
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+ radius = 0;
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+ }
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*sector = num * unit_size / dev->sector_size;
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/* negative numbers count from the end */
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--
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2.7.4
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