From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Wed, 23 Aug 2000 22:43:00 -0400
From: Peter Green <pcg@gospelcom.net>
Subject: Re: [linux-lvm] LVM and sw RAID1
Message-ID: <20000823224300.E8398@gospelcom.net>
References: <20000823194847.D8398@gospelcom.net> <200008240002.e7O02bo03155@webber.adilger.net>
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In-Reply-To: <200008240002.e7O02bo03155@webber.adilger.net>; from adilger@turbolinux.com on Wed, Aug 23, 2000 at 06:02:37PM -0600
Sender: owner-linux-lvm
Errors-To: owner-linux-lvm
List-Id: <linux-lvm.redhat.com>
To: Andreas Dilger <adilger@turbolinux.com>
Cc: linux-lvm@msede.com


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also sprach adilger:
> Have you tried running "pvcreate -v -d /dev/md0"?  It may be that you
> get some more clues with this.  Maybe even strace of the above.  It
> looks like pvcreate is not getting the correct "dev" or "rdev" from the
> inode...

I ran ``strace -o pv.strace -ff -s 100 -v pvcreate -d -v /dev/md0 > pv.out
2>pv.debug''. I've attached the three output files (gzip'd for pv.strace).

The problem occurs in pv_get_size() starting around line 87. The device name
is looked up in the cache. If found, it is tested to be a partitioned device
or not. This call returns false for the /dev/md? devices; MD_MAJOR is not
listed as a valid major number for partitioned devices (rightly so, I
think).

Since lvm_check_partitioned_dev() returns FALSE, the for loop is never
executed, and ``i'' remains at the value to which it was initialized (0) on
line 50. However, i is then used at line 103 to get the device name:

  strncpy ( disk_dev_name, dir_cache[i].dev_name, sizeof ( disk_dev_name) - 1);

This obviously assumes we're dealing solely with partitioned devices, which
in my case I'm not. Since i=0, dir_cache[i].dev_name is the name of the
first device: /dev/sda. The strace provides evidence of this:

  write(2, "lvm_check_partitioned_dev -- LEAVING\n", 37) = 37
  open("/dev/sda", O_RDONLY)              = 5

Everywhere else in the strace references /dev/md0, which is what I used on
the cmdline.

Do these files help any?

/pg
-- 
Peter Green : Gospel Communications Network, SysAdmin : pcg@gospelcom.net
---
"I don't know why, but first C programs tend to look a lot worse than
first programs in any other language (maybe except for fortran, but then
I suspect all fortran programs look like `firsts')"
(By Olaf Kirch)


--pf9I7BMVVzbSWLtt
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pvcreate -- locking logical volume manager
pvcreate -- checking physical volume name "/dev/md0"
pvcreate -- getting physical volume size
pvcreate -- checking partition type

--pf9I7BMVVzbSWLtt
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Content-Disposition: attachment; filename="pv.debug"

<1> lvm_get_iop_version -- CALLED
<22> lvm_check_special -- CALLED
<22> lvm_check_special -- LEAVING
<1> lvm_get_iop_version -- AFTER ioctl ret: 0
<1> lvm_get_iop_version -- LEAVING with ret: 6
<1> lvm_lock -- CALLED
<22> lvm_check_special -- CALLED
<22> lvm_check_special -- LEAVING
<1> lvm_lock -- LEAVING with ret: 0
<1> pv_check_name -- CALLED eith "/dev/md0"
<22> lvm_check_chars -- CALLED with name: "/dev/md0"
<22> lvm_check_chars -- LEAVING with ret: 0
<22> lvm_check_dev -- CALLED
<22> lvm_check_dev -- LEAVING with ret: 1
<1> pv_check_name -- LEAVING with ret: 0
<1> pv_get_size -- CALLED with /dev/md0 and BFFFF76C
<22> pv_check_name -- CALLED eith "/dev/md0"
<333> lvm_check_chars -- CALLED with name: "/dev/md0"
<333> lvm_check_chars -- LEAVING with ret: 0
<333> lvm_check_dev -- CALLED
<333> lvm_check_dev -- LEAVING with ret: 1
<22> pv_check_name -- LEAVING with ret: 0
<22> pv_check_part -- CALLED with /dev/md0
<333> pv_check_name -- CALLED eith "/dev/md0"
<4444> lvm_check_chars -- CALLED with name: "/dev/md0"
<4444> lvm_check_chars -- LEAVING with ret: 0
<4444> lvm_check_dev -- CALLED
<4444> lvm_check_dev -- LEAVING with ret: 1
<333> pv_check_name -- LEAVING with ret: 0
<333> lvm_dir_cache_find -- CALLED
<4444> pv_check_name -- CALLED eith "/dev/md0"
<55555> lvm_check_chars -- CALLED with name: "/dev/md0"
<55555> lvm_check_chars -- LEAVING with ret: 0
<55555> lvm_check_dev -- CALLED
<55555> lvm_check_dev -- LEAVING with ret: 1
<4444> pv_check_name -- LEAVING with ret: 0
<4444> lvm_dir_cache -- CALLED
<55555> lvm_add_dir_cache -- CALLED
<666666> lvm_check_dev -- CALLED
<666666> lvm_check_dev -- LEAVING with ret: 1
<666666> lvm_dir_cache_hit -- CALLED
<666666> lvm_dir_cache_hit -- LEAVING with ret: 0
<55555> lvm_add_dir_cache -- LEAVING
<55555> lvm_add_dir_cache -- CALLED
<666666> lvm_check_dev -- CALLED
<666666> lvm_check_dev -- LEAVING with ret: 1
<666666> lvm_dir_cache_hit -- CALLED
<666666> lvm_dir_cache_hit -- LEAVING with ret: 0
<55555> lvm_add_dir_cache -- LEAVING
<55555> lvm_add_dir_cache -- CALLED
<666666> lvm_check_dev -- CALLED
<666666> lvm_check_dev -- LEAVING with ret: 1
<666666> lvm_dir_cache_hit -- CALLED
<666666> lvm_dir_cache_hit -- LEAVING with ret: 0
<55555> lvm_add_dir_cache -- LEAVING
<55555> lvm_add_dir_cache -- CALLED
<666666> lvm_check_dev -- CALLED
<666666> lvm_check_dev -- LEAVING with ret: 1
<666666> lvm_dir_cache_hit -- CALLED
<666666> lvm_dir_cache_hit -- LEAVING with ret: 0
<55555> lvm_add_dir_cache -- LEAVING
<55555> lvm_add_dir_cache -- CALLED
<666666> lvm_check_dev -- CALLED
<666666> lvm_check_dev -- LEAVING with ret: 1
<666666> lvm_dir_cache_hit -- CALLED
<666666> lvm_dir_cache_hit -- LEAVING with ret: 0
<55555> lvm_add_dir_cache -- LEAVING
<55555> lvm_add_dir_cache -- CALLED
<666666> lvm_check_dev -- CALLED
<666666> lvm_check_dev -- LEAVING with ret: 1
<666666> lvm_dir_cache_hit -- CALLED
<666666> lvm_dir_cache_hit -- LEAVING with ret: 0
<55555> lvm_add_dir_cache -- LEAVING
<55555> lvm_add_dir_cache -- CALLED
<666666> lvm_check_dev -- CALLED
<666666> lvm_check_dev -- LEAVING with ret: 1
<666666> lvm_dir_cache_hit -- CALLED
<666666> lvm_dir_cache_hit -- LEAVING with ret: 0
<55555> lvm_add_dir_cache -- LEAVING
<55555> lvm_add_dir_cache -- CALLED
<666666> lvm_check_dev -- CALLED
<666666> lvm_check_dev -- LEAVING with ret: 1
<666666> lvm_dir_cache_hit -- CALLED
<666666> lvm_dir_cache_hit -- LEAVING with ret: 0
<55555> lvm_add_dir_cache -- LEAVING
<55555> lvm_add_dir_cache -- CALLED
<666666> lvm_check_dev -- CALLED
<666666> lvm_check_dev -- LEAVING with ret: 1
<666666> lvm_dir_cache_hit -- CALLED
<666666> lvm_dir_cache_hit -- LEAVING with ret: 0
<55555> lvm_add_dir_cache -- LEAVING
<55555> lvm_add_dir_cache -- CALLED
<666666> lvm_check_dev -- CALLED
<666666> lvm_check_dev -- LEAVING with ret: 1
<666666> lvm_dir_cache_hit -- CALLED
<666666> lvm_dir_cache_hit -- LEAVING with ret: 0
<55555> lvm_add_dir_cache -- LEAVING
<55555> lvm_add_dir_cache -- CALLED
<666666> lvm_check_dev -- CALLED
<666666> lvm_check_dev -- LEAVING with ret: 1
<666666> lvm_dir_cache_hit -- CALLED
<666666> lvm_dir_cache_hit -- LEAVING with ret: 0
<55555> lvm_add_dir_cache -- LEAVING
<55555> lvm_add_dir_cache -- CALLED
<666666> lvm_check_dev -- CALLED
<666666> lvm_check_dev -- LEAVING with ret: 1
<666666> lvm_dir_cache_hit -- CALLED
<666666> lvm_dir_cache_hit -- LEAVING with ret: 0
<55555> lvm_add_dir_cache -- LEAVING
<55555> lvm_add_dir_cache -- CALLED
<666666> lvm_check_dev -- CALLED
<666666> lvm_check_dev -- LEAVING with ret: 1
<666666> lvm_dir_cache_hit -- CALLED
<666666> lvm_dir_cache_hit -- LEAVING with ret: 0
<55555> lvm_add_dir_cache -- LEAVING
<55555> lvm_add_dir_cache -- CALLED
<666666> lvm_check_dev -- CALLED
<666666> lvm_check_dev -- LEAVING with ret: 1
<666666> lvm_dir_cache_hit -- CALLED
<666666> lvm_dir_cache_hit -- LEAVING with ret: 0
<55555> lvm_add_dir_cache -- LEAVING
<55555> lvm_add_dir_cache -- CALLED
<666666> lvm_check_dev -- CALLED
<666666> lvm_check_dev -- LEAVING with ret: 1
<666666> lvm_dir_cache_hit -- CALLED
<666666> lvm_dir_cache_hit -- LEAVING with ret: 0
<55555> lvm_add_dir_cache -- LEAVING
<55555> lvm_add_dir_cache -- CALLED
<666666> lvm_check_dev -- CALLED
<666666> lvm_check_dev -- LEAVING with ret: 1
<666666> lvm_dir_cache_hit -- CALLED
<666666> lvm_dir_cache_hit -- LEAVING with ret: 0
<55555> lvm_add_dir_cache -- LEAVING
<55555> lvm_add_dir_cache -- CALLED
<666666> lvm_check_dev -- CALLED
<666666> lvm_check_dev -- LEAVING with ret: 1
<666666> lvm_dir_cache_hit -- CALLED
<666666> lvm_dir_cache_hit -- LEAVING with ret: 0
<55555> lvm_add_dir_cache -- LEAVING
<55555> lvm_add_dir_cache -- CALLED
<666666> lvm_check_dev -- CALLED
<666666> lvm_check_dev -- LEAVING with ret: 1
<666666> lvm_dir_cache_hit -- CALLED
<666666> lvm_dir_cache_hit -- LEAVING with ret: 0
<55555> lvm_add_dir_cache -- LEAVING
<55555> lvm_add_dir_cache -- CALLED
<666666> lvm_check_dev -- CALLED
<666666> lvm_check_dev -- LEAVING with ret: 1
<666666> lvm_dir_cache_hit -- CALLED
<666666> lvm_dir_cache_hit -- LEAVING with ret: 0
<55555> lvm_add_dir_cache -- LEAVING
<55555> lvm_add_dir_cache -- CALLED
<666666> lvm_check_dev -- CALLED
<666666> lvm_check_dev -- LEAVING with ret: 1
<666666> lvm_dir_cache_hit -- CALLED
<666666> lvm_dir_cache_hit -- LEAVING with ret: 0
<55555> lvm_add_dir_cache -- LEAVING
<4444> lvm_dir_cache -- LEAVING with ret: 20
<333> lvm_dir_cache_find -- LEAVING
<333> lvm_partition_count -- CALLED
<333> lvm_partition_count -- LEAVING with ret: 16
<22> pv_check_part -- LEAVING with -218
<22> lvm_dir_cache -- CALLED
<22> lvm_dir_cache -- LEAVING with ret: 20
<22> lvm_dir_cache_find -- CALLED
<333> pv_check_name -- CALLED eith "/dev/md0"
<4444> lvm_check_chars -- CALLED with name: "/dev/md0"
<4444> lvm_check_chars -- LEAVING with ret: 0
<4444> lvm_check_dev -- CALLED
<4444> lvm_check_dev -- LEAVING with ret: 1
<333> pv_check_name -- LEAVING with ret: 0
<333> lvm_dir_cache -- CALLED
<333> lvm_dir_cache -- LEAVING with ret: 20
<22> lvm_dir_cache_find -- LEAVING
<22> lvm_check_partitioned_dev -- CALLED
<22> lvm_check_partitioned_dev -- LEAVING
<1> pv_get_size -- BEFORE llseek 0:0
<1> pv_get_size -- part[0].sys_ind: 83  part[0].nr_sects: 32067
<1> pv_get_size -- first == 1
<1> pv_get_size -- part_i == part_i_tmp
<1> pv_get_size -- LEAVING with ret: 32067
pvcreate -- invalid partition type 0x83 for "/dev/md0" (must be 0x8e)

<1> lvm_unlock -- CALLED
<1> lvm_unlock -- LEAVING with ret: 0

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