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From: | GNU bug Tracking System |
Subject: | bug#50168: closed (Inconsistent behavior creating partitions with 'Xmib' and 'X%' (off-by-1 error?)) |
Date: | Thu, 26 Aug 2021 21:43:02 +0000 |
Your message dated Thu, 26 Aug 2021 14:42:31 -0700 with message-id <YSgKx6GaFgesT79q@ohop.brianlane.com> and subject line Re: bug#50168: Inconsistent behavior creating partitions with 'Xmib' and 'X%' (off-by-1 error?) has caused the debbugs.gnu.org bug report #50168, regarding Inconsistent behavior creating partitions with 'Xmib' and 'X%' (off-by-1 error?) to be marked as done. (If you believe you have received this mail in error, please contact help-debbugs@gnu.org.) -- 50168: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=50168 GNU Bug Tracking System Contact help-debbugs@gnu.org with problems
--- Begin Message ---Subject: Inconsistent behavior creating partitions with 'Xmib' and 'X%' (off-by-1 error?) Date: Sun, 22 Aug 2021 19:59:06 +0200 [I'm not sure this is the appropriate place/way and if not, apologies, and can you point me to the right place/way] Hi, This is a forward of https://bugs.debian.org/988146 where I reported that partitions were created differently when using 'mib' unit vs '%' unit. To demonstrate it, I created 3 scripts which creates a 100MB image and do the partitioning within that. When reporting the Debian bug, I only had the mixed test and 'parted-bug-test- mixed.sh' is identical to the one attached here, apart from an 'else' clause which explicitly deletes a prior created image. In parted-bug-test-mixed.sh, I mixed 'mib' and '%' and due to the 100MB, that should've worked, but it did not. When using only 'mib' then the script fails too. When using only '%' then the script succeeds. I think parted does the right thing when using '%'. Relevant portion of output when running the mixed script: ======================================================= Creating partition table ... Done Creating 1st partition ('4mib' '20%') ... Done Creating 2nd partition ('20%' '40%' ... Done Creating 3rd partition ('40mib' '60mib') ... Done Showing partition layout Disk temp/parted-test.img: 100 MiB, 104857600 bytes, 204800 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: dos Disk identifier: 0x03f77810 Device Boot Start End Sectors Size Id Type temp/parted-test.img1 8192 40959 32768 16M c W95 FAT32 (LBA) temp/parted-test.img2 40960 81919 40960 20M 83 Linux temp/parted-test.img3 81920 122880 40961 20M 83 Linux Creating 4th partition ('60mib' '100%' ... Error: You requested a partition from 62,9MB to 105MB (sectors 122880..204799). The closest location we can manage is 62,9MB to 105MB (sectors 122881..204799). ======================================================= Cheers, Diederikparted-bug-test-mb.sh
Description: application/shellscriptparted-bug-test-perc.sh
Description: application/shellscriptparted-bug-test-mixed.sh
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--- Begin Message ---Subject: Re: bug#50168: Inconsistent behavior creating partitions with 'Xmib' and 'X%' (off-by-1 error?) Date: Thu, 26 Aug 2021 14:42:31 -0700 On Sun, Aug 22, 2021 at 07:59:06PM +0200, Diederik de Haas wrote: > This is a forward of https://bugs.debian.org/988146 where I reported that > partitions were created differently when using 'mib' unit vs '%' unit. This list is where those bugs end up, so the first one made it :) > > Creating 4th partition ('60mib' '100%' ... Error: You requested a partition > from 62,9MB to 105MB (sectors 122880..204799). > The closest location we can manage is 62,9MB to 105MB (sectors > 122881..204799). When you use MiB as a unit you are requesting an exact location, so this is telling you that sector 122880 (60*1024*1024) is already in use and it has to use the next sector instead. The other units use a snap algorithm with a radius of half the unit size (eg. 500k for MB) so it doesn't have this problem, and it is the default so that's why the output units are in MB. Brian -- Brian C. Lane (PST8PDT) - weldr.io - lorax - parted - pykickstart
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