Hi,
you are presented with examples of disks (partitioned probably with anaconda).
The "logical" partitions in question are shown by cfdisk (this is a cfdisk's
view of partitions), so the question first has to be directed to cfdisk about
correctness of reading, interpreting, and displaying partition info.
Is this a bug ? If yes, then only in cfdisk's display, but not as a result
of interpreting table data saved by some partitioning tool ?
Example 1.
==========
The last item (Free space) is "logical"
Logical 192425984* 192426569 0 586*Free Space
None
but clearly outside of extended partition's range.
4 Primary 105076736* 192425983* 0 87349248*Extended (05)
None
Should it be "None" like the Unusable partition between 3 and 2 ?
Is that space mapped ("logical") or not ?
Will an installer (e.g. anaconda which uses parted) know about it ?
# cfdisk -Ps
Partition Table for /dev/sda
First Last
# Type Sector Sector Offset Length Filesystem Type (ID)
Flag
-- ------- ----------- ----------- ------ ----------- -------------------- ----
1 Primary 0 71682029 63 71682030 HPFS/NTFS (07)
Boot
3 Primary 71682030 100978904* 0 29296875*Linux (83)
None
None 100978905* 100980735* 0 1831*Unusable
None
2 Primary 100980736* 105076735* 0 4096000*Linux swap / So (82)
None
4 Primary 105076736* 192425983* 0 87349248*Extended (05)
None
5 Logical 105076736* 192425983* 2048# 87349248*Linux (83)
None
Logical 192425984* 192426569 0 586*Free Space
None
# fdisk -l
Disk /dev/sda: 98.5 GB, 98522403840 bytes
255 heads, 63 sectors/track, 11978 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xa8a8a8a8
Device Boot Start End Blocks Id System
/dev/sda1 * 1 4462 35840983+ 7 HPFS/NTFS
/dev/sda2 6286 6541 2048000 82 Linux swap / Solaris
/dev/sda3 4463 6286 14648437+ 83 Linux
Partition 3 does not end on cylinder boundary.
/dev/sda4 6541 11978 43674624 5 Extended
/dev/sda5 6541 11978 43673600 83 Linux
Partition table entries are not in disk order
Example 2.
==========
One more "rule to follow" with regard to partitions:
http://www.lissot.net/partition/partition-03.html
...
Unlike primary partitions, logical partitions must be contiguous.
Each logical partition contains a pointer to the next logical partition, ...
Between partitions 2 and 4 there is a free space marked as "logical".
Logical 219463964* 219463964 0 1*Free Space
None
It is clearly outside of the Extended partition range.
How comes it is called "logical" if it violates the rule of contiguousness ?
# cfdisk -Ps
Partition Table for /dev/sda
First Last
# Type Sector Sector Offset Length Filesystem Type (ID)
Flag
-- ------- ----------- ----------- ------ ----------- -------------------- ----
1 Primary 0 128519 63 128520 Dell Utility (DE)
None
2 Primary 128520 219463963* 0 219335444*HPFS/NTFS (07)
Boot
Logical 219463964* 219463964 0 1*Free Space
None
4 Primary 219463965 615401954 0 395937990 W95 Ext'd (LBA) (0F)
None
5 Logical 219463965 223672994 63 4209030 Linux swap / So (82)
None
6 Logical 223672995 265618709 63 41945715 Linux (83)
Boot
7 Logical 265618710 615401954 63 349783245 Linux (83)
None
3 Primary 615401955 625137344 0 9735390 CP/M / CTOS / . (DB)
None
# fdisk -l
Disk /dev/sda: 320.1 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0xe686f016
Device Boot Start End Blocks Id System
/dev/sda1 1 8 64228+ de Dell Utility
/dev/sda2 * 9 13661 109667722 7 HPFS/NTFS
/dev/sda3 38308 38913 4867695 db CP/M / CTOS / ...
/dev/sda4 13662 38307 197968995 f W95 Ext'd (LBA)
/dev/sda5 13662 13923 2104483+ 82 Linux swap / Solaris
/dev/sda6 * 13924 16534 20972826 83 Linux
/dev/sda7 16535 38307 174891591 83 Linux
Example 3.
==========
This example is by Michael Schwendt <mschwendt <at> gmail.com> .
These are his comments.
You might want to examine the cfdisk source code to find out. cfdisk does
not claim it would be a valid partition. It just prints a partition type
for the free space, and that already could be a bug. Happens here, too:
First Last
# Type Sector Sector Offset Length Filesystem Type (ID) Flag
-- ------- ----------- ----------- ------ ----------- -------------------- ----
1 Primary 0 390625* 1# 390626*Linux (83) Boot
2 Primary 390626* 781250* 0 390625*Linux (83) None
3 Primary 781251* 39062500* 0 38281250*Linux (83) None
Logical 39062501* 39070079 0 7579*Free Space None
4 Primary 39070080 976768064 0 937697985 W95 Ext'd (LBA) (0F) None
5 Logical 39070080 78124094 63 39054015 Linux (83) None
6 Logical 78124095 117194174 63 39070080 Linux (83) None
7 Logical 117194175 156248189 63 39054015 Linux (83) None
8 Logical 156248190 195318269 63 39070080 Linux (83) None
9 Logical 195318270 203125859 63 7807590 Linux swap / So (82) None
10 Logical 203125860 976768064 63 773642205 Linux LVM
(8E) None
Regards,
JB
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