[dm-devel] Regarding dm-linear.c
Adam Hamsik
haaaad at gmail.com
Fri Sep 12 23:58:13 UTC 2008
Hi,
On Sep,Friday 12 2008, at 7:18 PM, rohit vashist wrote:
> Hi,
>
> I am currently working on device mapper and logical volume
> manager.My question is whether dm-linear.c 's
> function linear_ctr and linear_map is called or not when we do
> lvcreate.(or vgcreate,pvcreate).I am concentrating
> on linear mapping only.I did strace but i m not able to figure it out.
pvcreate and vgcreate are completely independent from device-mapper
driver. Only lvcreate and other lv
commands communicates with dm driver.
I'm not linux expert :), but I think that during lvcreate only
linear_ctr function is called. Because it allocates "linear context"
for loaded table. Context is probably some target specific
configuration memory
area.
linear_map is probably called only during IO. When is IO issued on
virtual device mapped to a real
block device.
Regards
Adam.
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