Re: +rule: query device inode by Major and Minor - am i inventing

[Arioch <the_Arioch@nm.ru>]

Kay Sievers пишет:

> What nodes exactly have the same major/minor? That setup may need to be
> fixed.

Now i think that %M and %m macros are expanded somehow strangely:

$ pwd
/dev/.lookup_by_numbers

$for i in  DUP/*  ; do j=${i#*/}; h=${j%_*}; ls -l $h $i ; echo; done

     [... list skipped - there is longer and more detailed one below ...]


I was intrigued by duplicating of /dev/null.
Was this device created twice ???


$ls -l ../ram3 ../nu*
crw-rw-rw-  1 root root 1, 3 Авг 16 19:47 ../null
brw-rw----  1 root disk 1, 3 Авг 16 19:47 ../ram3

You see, it seems character and block devices with same major|minor can 
easily co-exist!




$for i in {1,2,3,4,5}; do ls ../hda$i ../pty/s$i -l ; done
brw-rw----  1 root root 3,   1 Авг 16 19:47 ../hda1
crw-rw----  1 root tty  3, 161 Авг 16 19:47 ../pty/s1
brw-rw----  1 root root 3,   2 Авг 16 19:47 ../hda2
crw-rw----  1 root tty  3, 162 Авг 16 19:47 ../pty/s2
brw-rw----  1 root root 3,   3 Авг 16 19:47 ../hda3
crw-rw----  1 root tty  3, 163 Авг 16 19:47 ../pty/s3
brw-rw----  1 root root 3,   4 Авг 16 19:47 ../hda4
crw-rw----  1 root tty  3, 164 Авг 16 19:47 ../pty/s4
brw-rw----  1 root root 3,   5 Авг 16 19:47 ../hda5


You see, on one hand we again see mixing block and char devices.
On the othe hands, it seems that when %m was expanded - it subtrcted 160 
from it's value. 160=32*5 - so was minor masked with 2:00011111 ?

Or can major|minor be silently changed later, after symlink already 
created ?



To be more generic, and more longer
    $for i in  DUP/*  ; do j=${i#*/}; h=${j%_*}; ls -l $i ;ls -l 
`readlink -e $i`; ls -l $h; ls -l `readlink -e $h`; echo; done

lrwxrwxrwx  1 root root 10 Авг 16 19:47 DUP/major1@minor11_DUP -> ../../kmsg
crw-rw----  1 root root 1, 11 Авг 16 19:47 /dev/kmsg
lrwxrwxrwx  1 root root 8 Авг 16 19:47 major1@minor11 -> ../ram11
brw-rw----  1 root disk 1, 11 Авг 16 19:47 /dev/ram11

lrwxrwxrwx  1 root root 9 Авг 16 19:47 DUP/major1@minor1_DUP -> ../../mem
crw-r-----  1 root root 1, 1 Авг 16 19:47 /dev/mem
lrwxrwxrwx  1 root root 7 Авг 16 19:47 major1@minor1 -> ../ram1
brw-rw----  1 root disk 1, 1 Авг 16 19:47 /dev/ram1

lrwxrwxrwx  1 root root 10 Авг 16 19:47 DUP/major1@minor2_DUP -> ../../kmem
crw-r-----  1 root root 1, 2 Авг 16 19:47 /dev/kmem
lrwxrwxrwx  1 root root 7 Авг 16 19:47 major1@minor2 -> ../ram2
brw-rw----  1 root disk 1, 2 Авг 16 19:47 /dev/ram2

lrwxrwxrwx  1 root root 10 Авг 16 19:47 DUP/major1@minor3_DUP -> ../../ram3
brw-rw----  1 root disk 1, 3 Авг 16 19:47 /dev/ram3
lrwxrwxrwx  1 root root 7 Авг 16 19:47 major1@minor3 -> ../null
crw-rw-rw-  1 root root 1, 3 Авг 16 19:47 /dev/null

lrwxrwxrwx  1 root root 10 Авг 16 19:47 DUP/major1@minor3_DUP1 -> ../../null
crw-rw-rw-  1 root root 1, 3 Авг 16 19:47 /dev/null
lrwxrwxrwx  1 root root 7 Авг 16 19:47 major1@minor3 -> ../null
crw-rw-rw-  1 root root 1, 3 Авг 16 19:47 /dev/null

lrwxrwxrwx  1 root root 10 Авг 16 19:47 DUP/major1@minor4_DUP -> ../../port
crw-r-----  1 root root 1, 4 Авг 16 19:47 /dev/port
lrwxrwxrwx  1 root root 7 Авг 16 19:47 major1@minor4 -> ../ram4
brw-rw----  1 root disk 1, 4 Авг 16 19:47 /dev/ram4

lrwxrwxrwx  1 root root 10 Авг 16 19:47 DUP/major1@minor5_DUP -> ../../zero
crw-rw-rw-  1 root root 1, 5 Авг 16 19:47 /dev/zero
lrwxrwxrwx  1 root root 7 Авг 16 19:47 major1@minor5 -> ../ram5
brw-rw----  1 root disk 1, 5 Авг 16 19:47 /dev/ram5

lrwxrwxrwx  1 root root 10 Авг 16 19:47 DUP/major1@minor7_DUP -> ../../full
crw-rw-rw-  1 root root 1, 7 Авг 16 19:47 /dev/full
lrwxrwxrwx  1 root root 7 Авг 16 19:47 major1@minor7 -> ../ram7
brw-rw----  1 root disk 1, 7 Авг 16 19:47 /dev/ram7

lrwxrwxrwx  1 root root 12 Авг 16 19:47 DUP/major1@minor8_DUP -> 
../../random
crw-rw-rw-  1 root root 1, 8 Авг 16 19:47 /dev/random
lrwxrwxrwx  1 root root 7 Авг 16 19:47 major1@minor8 -> ../ram8
brw-rw----  1 root disk 1, 8 Авг 16 19:47 /dev/ram8

lrwxrwxrwx  1 root root 13 Авг 16 19:47 DUP/major1@minor9_DUP -> 
../../urandom
cr--r--r--  1 root root 1, 9 Авг 16 19:47 /dev/urandom
lrwxrwxrwx  1 root root 7 Авг 16 19:47 major1@minor9 -> ../ram9
brw-rw----  1 root disk 1, 9 Авг 16 19:47 /dev/ram9

lrwxrwxrwx  1 root root 12 Авг 16 19:47 DUP/major3@minor0_DUP -> 
../../pty/s0
crw-rw----  1 root tty 3, 160 Авг 16 19:47 /dev/pty/s0
lrwxrwxrwx  1 root root 6 Авг 16 19:47 major3@minor0 -> ../hda
brw-rw----  1 root root 3, 0 Авг 16 19:47 /dev/hda

lrwxrwxrwx  1 root root 12 Авг 16 19:47 DUP/major3@minor1_DUP -> 
../../pty/s1
crw-rw----  1 root tty 3, 161 Авг 16 19:47 /dev/pty/s1
lrwxrwxrwx  1 root root 7 Авг 16 19:47 major3@minor1 -> ../hda1
brw-rw----  1 root root 3, 1 Авг 16 19:47 /dev/hda1

lrwxrwxrwx  1 root root 12 Авг 16 19:47 DUP/major3@minor2_DUP -> 
../../pty/s2
crw-rw----  1 root tty 3, 162 Авг 16 19:47 /dev/pty/s2
lrwxrwxrwx  1 root root 7 Авг 16 19:47 major3@minor2 -> ../hda2
brw-rw----  1 root root 3, 2 Авг 16 19:47 /dev/hda2

lrwxrwxrwx  1 root root 12 Авг 16 19:47 DUP/major3@minor3_DUP -> 
../../pty/s3
crw-rw----  1 root tty 3, 163 Авг 16 19:47 /dev/pty/s3
lrwxrwxrwx  1 root root 7 Авг 16 19:47 major3@minor3 -> ../hda3
brw-rw----  1 root root 3, 3 Авг 16 19:47 /dev/hda3

lrwxrwxrwx  1 root root 12 Авг 16 19:47 DUP/major3@minor4_DUP -> 
../../pty/s4
crw-rw----  1 root tty 3, 164 Авг 16 19:47 /dev/pty/s4
lrwxrwxrwx  1 root root 7 Авг 16 19:47 major3@minor4 -> ../hda4
brw-rw----  1 root root 3, 4 Авг 16 19:47 /dev/hda4

lrwxrwxrwx  1 root root 12 Авг 16 19:47 DUP/major3@minor5_DUP -> 
../../pty/s5
crw-rw----  1 root tty 3, 165 Авг 16 19:47 /dev/pty/s5
lrwxrwxrwx  1 root root 7 Авг 16 19:47 major3@minor5 -> ../hda5
brw-rw----  1 root root 3, 5 Авг 16 19:47 /dev/hda5



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