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authorJoey Hess2017-12-21 17:02:26 -0400
committerJoey Hess2017-12-21 17:02:26 -0400
commit11324db5a8dc1aea3a92abc0a732c52075299a41 (patch)
tree2a1779e7a326b7e613d91511445a37a4152de67b /doc/forum/imageBuiltFor_mount_points_not_automatically_created/comment_7_ad9ea2799890df2dfce4f0cc99e397e9
parent459e5a0c00e8a2ef04c56ebe29cef7388140ee44 (diff)
fix location
Diffstat (limited to 'doc/forum/imageBuiltFor_mount_points_not_automatically_created/comment_7_ad9ea2799890df2dfce4f0cc99e397e9')
-rw-r--r--doc/forum/imageBuiltFor_mount_points_not_automatically_created/comment_7_ad9ea2799890df2dfce4f0cc99e397e9/comment_1_68b3d9ca04283c2400f5b23e486bb4b7._comment62
1 files changed, 0 insertions, 62 deletions
diff --git a/doc/forum/imageBuiltFor_mount_points_not_automatically_created/comment_7_ad9ea2799890df2dfce4f0cc99e397e9/comment_1_68b3d9ca04283c2400f5b23e486bb4b7._comment b/doc/forum/imageBuiltFor_mount_points_not_automatically_created/comment_7_ad9ea2799890df2dfce4f0cc99e397e9/comment_1_68b3d9ca04283c2400f5b23e486bb4b7._comment
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--- a/doc/forum/imageBuiltFor_mount_points_not_automatically_created/comment_7_ad9ea2799890df2dfce4f0cc99e397e9/comment_1_68b3d9ca04283c2400f5b23e486bb4b7._comment
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-[[!comment format=mdwn
- username="joey"
- subject="""comment 1"""
- date="2017-12-21T19:44:45Z"
- content="""
-Reproduced it with that information.
-
- ghci> calcPartedParamsSize guexPartTable
- (["mklabel","gpt","mkpart","primary","fat32","4194304B","16777215B","set","1","esp","on","mkpart","primary","ext2","16777216B","167772159B","mkpart","primary","ext4","167772160B","1660944383B"],1660944384)
- joey@darkstar:~>dd if=/dev/zero of=test bs=1M count=1584
- joey@darkstar:~>parted test
- (parted) p
- Model: (file)
- Disk /home/joey/test: 1661MB
- Sector size (logical/physical): 512B/512B
- (parted) mklabel gpt
- (parted) mkpart primary fat32 4194304B 16777215B
- (parted) mkpart primary ext2 16777216B 167772159B
- (parted) mkpart primary ext4 167772160B 1660944383B
- Warning: You requested a partition from 168MB to 1661MB (sectors 327680..3244031).
- The closest location we can manage is 168MB to 1661MB (sectors 327680..3243998).
-
-The problem only occurs with the gpt partition table. With "mklabel msdos",
-the mkpart command succeeds.
-
-So, gpt must have an additional restriction
-of some kind. I don't know what. The highest end position that parted
-will accept for that partition is 1660927487B; slightly smaller partitions
-are accepted. It's not a requirement that the position or size be divisible
-by anything in particular. Perhaps gpt needs some amount of reserved space
-at the end of the disk or something.
-
-Before 4MiB alignment was added, here's what
-propellor did for the same PartTable, which worked.
-
- mkpart primary ext4 160MB 1649MB
-
-It would be good for propellor to not need to know about all the minutia of
-partition tables. Seems that the way it used to call parted gave it enough
-wiggle room that it avoided this kind of problem.
-
-To make parititions well aligned, propellor needs to precisely control where
-they begin (since parted does not have a way to configure modern
-alignment requirments). Perhaps propellor could precisely specify where a
-partition begins, but use the "MB" to leave wiggle room in where it ends
-so parted can pick a suitable end point.
-
-Let's see.. this works with the gpt example:
-
- (parted) mkpart primary fat32 4194304B 16.777215MB
- (parted) mkpart primary ext2 16777216B 167.772159MB
- (parted) mkpart primary ext4 167772160B 660.944383MB
-
-That lets parted end the last partition right at the ideal 1660927487B.
-The previous two partitions end right where propellor expects.
-(Hopefully parted never rounds a MB value *up*!)
-
-Ok, I've convinced myself to make propellor use this wacky technique
-of B for the start position and fractional MB for the end position!
-I've implemented it, hopefully my analysis above is good to make
-this work with all the different kinds of partition tables.
-"""]]