On Tue, Feb 11, 2003 at 06:49:22AM -0000, Rajaram Suresh Gaunker wrote:
[NOTE: I've cut your CC list. Allessandro Rubini wan't too happy about
your CC last time simply cause he had nothing to do with it. Therefore
I don't trust your posting behaviour and only CC'ed the kernelnewbies
list. Randomly CC'ing innocent people is very annoying for them.
Please think before you post next time. Thank you.]
> In encrypted filesystem u need to add some more safe encryption
> algorithms , but losetup provides two options for algprithm
> specificatopn ,
>
> what i need to do when i want to provide the more option.
Check the source.
> Do anybody know where losetups code is located.
The losetup command usually lives in the same package that provides the
mount command. On a Debian system you figure out with "dpkg -S
/sbin/losetup", on an RPM based distribution you need "rpm -qf
/sbin/losetup". Get the source package ("apt-get source mount" on
/Debian), and you'll have your source.
> Is it a system call .. i didn't found anything like that in
> syscall source code.
Remember that it works on a loop device, so it has to be an ioctl. How
to find such things?
- The loop device configuration question is asked in the block devices
section, so read drivers/block/Config.in
- The config option for "Loopback device support" is called
CONFIG_BLK_DEV_LOOP
- drivers/block/Makefile says it needs to build loop.o if
CONFIG_BLK_DEV_LOOP is selected
- In order to build loop, loop.c is needed, so the file to look at is
drivers/block/loop.c
- It's a device so look for the ioctl() function
Erik
--
J.A.K. (Erik) Mouw
Email: J.A.K.Mouw@its.tudelft.nl mouw@nl.linux.org
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