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SubjectRe: Write file in EXT2
Thanks for the details,

But I would like to know when each FS is being accessed, and by which application. Isnt there a single path, say something in the driver code, from where all write/read commands pass? So that we can have a function call from that place, and create a log?

And also, how do I create a logfile on my own. With my own function within the kernel. I dont wish to go to Userland and do the write process.

Thanks in advance.

Sumit

--

On Tue, 6 May 2003 10:17:08
Matti Aarnio wrote:
>On Mon, May 05, 2003 at 11:14:46PM -0400, Sumit Narayan wrote:
>> Hi,
>>
>> I would like to create a log file containing the reads and writes made
>> on a disk, by adding a function in the kernel. And once this log table
>> reaches a limit, say 10,000 records, I would like it to be written on
>> hard disk automatically. I am unable to do this, since I dont know how
>> to write to a file, while in the kernel. I tried System Calls, but they
>> dont seem to work. Could someone tell me what is the list of functions
>> that I need to use to do this job. I think I have to play with
>> super-blocks and inodes. But I dont know how to do that. :) Please help
>> me.
>
>
> Considering how to do that log writing:
>
> Kernel contains several codes that are writing data to disk for
> various "logging" tasks. Most promimnent example of them is:
>
> kernel/acct.c
>
> It keeps kernel internal file descriptor ("filp") for its
> internal use. It has code that opens a file for writing
> to it, actual writer (one smallish block at the time, but
> that is merely size parameter issue), and it also closes
> the file when wanted (e.g. under administrator control).
>
> All that completely independent of target filesystem.
>
> Oh, and of course it has management interface, so that
> sysadmin can tell to it:
> - when to activate / deactivate
> - into which file to log
>
>
> In your application there is a danger of snaring
> yourself: disk activity must not stop at logging
> something, when the log buffer is full and flushing
> it is under way. Otherwise you are in danger of
> halting the log-flush, and then you have a dead
> machine.
>
>> Thanks.
>> Sumit
>>
>> p.s. I am using Kernel 2.4.20 and want this in EXT2 FS
>
>/Matti Aarnio
>-
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