From: Rajat Sharma (sharma.rajat_at_noida.hcltech.com)
Date: Tue Nov 21 2006 - 15:12:08 CET
From: Rajat Sharma <sharma.rajat@noida.hcltech.com> Date: Tue, 21 Nov 2006 19:42:08 +0530 Message-Id: <1164118328.2578.18.camel@rajat> Subject: [suse-sles-e] stat function of dummy filesystm called while mounting some otherfilesystem.
Hi,
I was trying to write a dummy filesystem, and implemented its getattr
method. I have put some debug messages inside this function. Now I
mounted this file system first, with debug messages on. Then I mounted
an altogether different file system (say nfs). I have observed one
thing, while mounting this second file system (nfs), getattr method of
my dummy filesystem (which is already mounted) also gets called while
vice-versa is not true.
So, my observation is:
1. mount some file system which is not included in the distribution (and
mainstream kernel).
2. mount some other filesystem (any filesystem).
3. while mounting second filesystem, getattr method (stat) is called for
the root directory of first filesystem.
Earlier I was targeting kernel space and vfs layer for this, but as I
could not find any such difference easily, I tried to compile same
kernel on FC5 and repeated the experiment, but there was no messing up
of getattr calls across filesystem. I guess this is specific to SLES 10
only (I also tried with SLES 9).
Please help me if there is any such behavioral change in util-linux
package or somewhere else in userspace.
rajat
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