Hi Kent,
The block device did indeed get created in /dev and the correct
pointer exists in /sys/block/bcache0/dev
I straced pvcreate and attached the outout, I couldn't see anything
that far out of the ordinary though - bar the return that the device
had been filtered.
I am using commit f4c09286dd3f761310b24bc03e5ce95793a9a30c of
bcache-tools.git and commit 7c3e597ca0f5c87767548d1e9aced024aa558b2a
of linux-bcache.git
The other thing I noticed was that the /dev/disk-by/uuid symlink
wasn't created. I went ahead and created this myself but I will
investigate why the udev rule didn't do this for me.
Below is relevant lines from pvscan and pvcreate:
dev05 ~ # cat pvscan.log | grep bcache
execve("/sbin/pvscan", ["pvscan", "/dev/bcache0"], [/* 23 vars */]) = 0
read(3, "strace\0pvscan\0/dev/bcache0\0", 31) = 27
readlink("/sys/class/block/bcache0",
"../../devices/virtual/block/bcache0"..., 1024) = 35
stat("/sys/devices/virtual/block/bcache0/uevent",
{st_mode=S_IFREG|0644, st_size=4096, ...}) = 0
readlink("/sys/devices/virtual/block/bcache0", 0x7fff9e17aea0, 1024) =
-1 EINVAL (Invalid argument)
stat("/sys/devices/virtual/block/bcache0/uevent",
{st_mode=S_IFREG|0644, st_size=4096, ...}) = 0
open("/sys/devices/virtual/block/bcache0/uevent", O_RDONLY|O_CLOEXEC) = 4
read(4, "MAJOR=252\nMINOR=0\nDEVNAME=bcache"..., 4096) = 47
readlink("/sys/devices/virtual/block/bcache0/subsystem",
"../../../../class/block"..., 1024) = 23
read(4, "N:bcache0\nW:40\nI:580433490\n", 4096) = 27
stat("/dev/bcache0", {st_mode=S_IFBLK|0660, st_rdev=makedev(252, 0), ...}) = 0
stat("/sys/class/block/bcache0/dev", {st_mode=S_IFREG|0444,
st_size=4096, ...}) = 0
open("/sys/class/block/bcache0/dev", O_RDONLY) = 6
dev05 ~ # cat pvcreate-strace.log | grep bcache
execve("/sbin/pvcreate", ["pvcreate", "/dev/bcache0"], [/* 23 vars */]) = 0
read(3, "strace\0pvcreate\0/dev/bcache0\0", 31) = 29
stat("/dev/bcache0", {st_mode=S_IFBLK|0660, st_rdev=makedev(252, 0), ...}) = 0
readlink("/sys/dev/block/252:0",
"../../devices/virtual/block/bcache0", 1024) = 35
stat("/sys/devices/virtual/block/bcache0/uevent",
{st_mode=S_IFREG|0644, st_size=4096, ...}) = 0
stat("/sys/class/block/bcache0/dev", {st_mode=S_IFREG|0444,
st_size=4096, ...}) = 0
open("/sys/class/block/bcache0/dev", O_RDONLY) = 6
stat("/dev/bcache0", {st_mode=S_IFBLK|0660, st_rdev=makedev(252, 0), ...}) = 0
stat("/dev/bcache0", {st_mode=S_IFBLK|0660, st_rdev=makedev(252, 0), ...}) = 0
stat("/sys/class/block/bcache0/dev", {st_mode=S_IFREG|0444,
st_size=4096, ...}) = 0
open("/sys/class/block/bcache0/dev", O_RDONLY) = 6
write(2, "Device /dev/bcache0 not found (o"..., 56Device /dev/bcache0
not found (or ignored by filtering).) = 56
Kind regards,
Joseph.
On 2 March 2012 17:44, Kent Overstreet <kent.overstreet@xxxxxxxxx> wrote:
> Oh - try stracing the pvcreate and see what happens.
>
> On Thu, Mar 1, 2012 at 10:03 PM, Kent Overstreet
> <kent.overstreet@xxxxxxxxx> wrote:
>> Weird.
>>
>> Did the /dev/bcache0 device get create created by udev?
>>
>> It's possible my code isn't poking the right thing. *mutters about the
>> block layer...*
>>
>> On Thu, Mar 1, 2012 at 9:49 PM, Joseph Glanville
>> <joseph.glanville@xxxxxxxxxxxxxx> wrote:
>>> Hi,
>>>
>>> I can't use bcache devices as members of lvm volume groups because
>>> dmsetup can't find the devices.
>>> It provides the ever useful feedback of:
>>> # pvcreate /dev/bcache0
>>> Device /dev/bcache0 not found (or ignored by filtering).
>>>
>>> My LVM.conf is only filtering out nbd devices:
>>> filter = [ "r|/dev/nbd.*|", "a/.*/" ]
>>>
>>> Any insight would be greatly appreciated. :)
>>>
>>> I also noted that bcache devices don't appear in iostat..
>>>
>>> Joseph.
>>>
>>> --
>>> Founder | Director | VP Research
>>> Orion Virtualisation Solutions | www.orionvm.com.au | Phone: 1300 56
>>> 99 52 | Mobile: 0428 754 846
>>>
>>>
>>> --
>>> Founder | Director | VP Research
>>> Orion Virtualisation Solutions | www.orionvm.com.au | Phone: 1300 56
>>> 99 52 | Mobile: 0428 754 846
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