Hi Karel
On Mon, Apr 29, 2013 at 02:36:51PM +0200, Karel Zak wrote:
> On Mon, Apr 29, 2013 at 01:40:41PM +0200, Philippe De Muyter wrote:
> > > why not memset(pps_found, ....)? I also see magical constant 16
> >
> > Actually 16 is the maximum partition count allowed in a disk by linux,
> > or should it be 15 ? Is there already a constant for that ?
> > The AIX disk I tested with had only :) 11 partitions.
>
> I don't think it's correct to expect any hardcoded limit.
>
> The struct parsed_partitions->parts is allocated according to
> disk_max_parts() where the limit depends on number of minor numbers or
> it's DISK_MAX_PARTS (=256).
>
> There is no problem to create disk with many partitions:
>
> # modprobe scsi_debug dev_size_mb=300
> # (echo -e 'g\n'; for i in {1..100}; do echo -e "n\n\n\n+1M"; done; \
> echo -e 'w\nq\n') | fdisk /dev/sdb
>
> # lsblk -n /dev/sdb | wc -l
> 101
how are they named then ?
on my system (a 2.6.24 kernel which is the last one that support my
powerpc PReP machine because PReP support got removed with the merge
of /arch/ppc and /arch/powerpc :( ), I get :
root:~# ls -l /dev/sd[ab]*
brw-r----- 1 root disk 8, 0 Apr 25 22:22 /dev/sda
brw-r----- 1 root disk 8, 10 Apr 25 22:22 /dev/sda10
brw-r----- 1 root disk 8, 11 Apr 25 22:22 /dev/sda11
brw-r----- 1 root disk 8, 3 Apr 25 22:22 /dev/sda3
brw-r----- 1 root disk 8, 4 Apr 25 22:22 /dev/sda4
brw-r----- 1 root disk 8, 5 Apr 25 22:22 /dev/sda5
brw-r----- 1 root disk 8, 6 Apr 25 22:22 /dev/sda6
brw-r----- 1 root disk 8, 7 Apr 25 22:22 /dev/sda7
brw-r----- 1 root disk 8, 8 Apr 25 22:22 /dev/sda8
brw-r----- 1 root disk 8, 9 Apr 25 22:22 /dev/sda9
brw-r----- 1 root disk 8, 16 Apr 25 22:22 /dev/sdb
brw-r----- 1 root disk 8, 26 Apr 25 22:22 /dev/sdb10
brw-r----- 1 root disk 8, 27 Apr 25 22:22 /dev/sdb11
brw-r----- 1 root disk 8, 19 Apr 25 22:22 /dev/sdb3
brw-r----- 1 root disk 8, 20 Apr 25 22:22 /dev/sdb4
brw-r----- 1 root disk 8, 21 Apr 25 22:22 /dev/sdb5
brw-r----- 1 root disk 8, 22 Apr 25 22:22 /dev/sdb6
brw-r----- 1 root disk 8, 23 Apr 25 22:22 /dev/sdb7
brw-r----- 1 root disk 8, 24 Apr 25 22:22 /dev/sdb8
brw-r----- 1 root disk 8, 25 Apr 25 22:22 /dev/sdb9
root:~#
so sda is 8,0 and sdb is 8,16
and if, while discovering partitions of /dev/sda, I try to make a
partition 16 or higher, it is silently discarded by 'put_partition'.
Is that changed ?
Philippe
--
Philippe De Muyter +32 2 6101532 Macq SA rue de l'Aeronef 2 B-1140 Bruxelles
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