...@nl.linux.org
Please read the FAQ at http://kernelnewbies.org/FAQ
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Thanks and regards,
Rohit Sharma
Associate Software Engineer
Security Technology and Response
Symantec Corporation
www.symantec.com
Hi,
In kernel hacking options during menuconfig,
u'll get an option for show timing information in printks,
check that and compile the kernel.
On Sat, Jul 11, 2009 at 10:06 AM, SandeepKsinha sandeepksi...@gmail.comwrote:
On Sat, Jul 11, 2009 at 6:50 AM, H M Thalib
On Fri, May 8, 2009 at 5:45 PM, Ole Loots o...@monochrom.net wrote:
Hello venkatram ajmeera
venkatram ajmeera schrieb:
Hai I am interested in learing linux kernel internal thouroughly
How the interrupt is handled by linux Kernel.
When interrupts occur, the registered interrupt handler
Arun, i suggest that if you are using this for IPC then , better use pipes.
And if you really want to use fd in another application then
pass the file descriptor to exec after doing a fork.
something like this.
in application_1
ret = fork();
if(ret == 0){
sprintf(buff, %d, fd_1);
Linux supports many architectures for its portability.
So architecture specific codes resides in arch directory.
On Sun, Apr 5, 2009 at 1:57 PM, Stoyan Gaydarov stoyboy...@gmail.com wrote:
I compiled my kernel(for x86_64) and i was wondering why it had to
create an x86_64 directory under the
If you have better understanding of C language, preprocessor directives usage
then you will understand the things more clearly.
And as debian developer suggested, if you can provide us with the code snippet
may be we can help. ;), also develop a habit of using csope or linux
cross reference.
On
.
Thanks.
On Fri, Mar 6, 2009 at 10:02 PM, Rohit Sharma imreckl...@gmail.com wrote:
Hi Nidhi
Please use, plain text for writing mails to newbies, it does not
look good.
hi all
i was practising writing block device driver from linux device driver 3rd
edition
but was confused
as
it gives
at 12:50 AM, Rohit Sharma imreckl...@gmail.com wrote:
Hi Nidhi,
Seems like you are stuck up with this issue.
Refer the following links if you haven't
Check out this link to understand block device driver
http://lwn.net/Articles/driver-porting/
for bio structures check this link
http://lwn.net
Hi Nidhi,
Seems like you are stuck up with this issue.
Refer the following links if you haven't
Check out this link to understand block device driver
http://lwn.net/Articles/driver-porting/
for bio structures check this link
http://lwn.net/Articles/26404/
in gyst :
when you actually transfer
Hi Abhish,
If you want to do kernel programming, just get a feel of linux first.
Become familiar with commands.
Read some nice books like BLP, UTLK and Linux Kernel Development.
After you are done with the books you will have a good idea of kernel.
Don't forget to learn kernel module programming.
Hi Nidhi,
i wanted to know where actually is block layer and where is driver
where are they separated
As far as I know, the differentiation between file system
block size and device block size lies in the generic block layer.
Generic block layer knows all about, sectors, blocks, segments and
Hi Greg,
Thanks for such great insights.
On Fri, Jan 16, 2009 at 11:41 PM, Greg Freemyer greg.freem...@gmail.com wrote:
On Fri, Jan 16, 2009 at 8:26 AM, Sandeep K Sinha
sandeepksi...@gmail.com wrote:
Hi Greg,
On Fri, Jan 16, 2009 at 5:50 AM, Greg Freemyer greg.freem...@gmail.com
wrote:
.
not sure if anyone else have a summary list of blockdevice API and its
explanation?
not wrt the following cleanup patch, i am not sure how the API will change:
http://lwn.net/Articles/304485/
thanks.
On Tue, Jan 6, 2009 at 6:36 PM, Rohit Sharma imreckl...@gmail.com wrote:
I want to read
The idea given by Greg looks perfectly fine,
i am going ahead to implement it,
I expect to face many challenges while
implementing Greg's algorithm because of
the way ext2 is designed.
I will update you guys soon.
On Fri, Jan 9, 2009 at 6:22 AM, Greg Freemyer greg.freem...@gmail.com wrote:
HSM
and its data blocks and update the dentry
with the new inode number.
PS: The file system remains completely frozen in this time.
On Wed, Jan 7, 2009 at 4:02 AM, Om om.tu...@gmail.com wrote:
Erik Mouw wrote:
On Tue, 6 Jan 2009 23:16:14 +0530 Rohit Sharma imreckl...@gmail.com
wrote:
On Tue
I want to read data blocks from one inode
and copy it to other inode.
I mean to copy data from data blocks associated with one inode
to the data blocks associated with other inode.
Is that possible in kernel space.?
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On Tue, Jan 6, 2009 at 7:42 PM, rishi agrawal postri...@gmail.com wrote:
yes i suppose the donor inode is known
moreover the receiver inode's number is also known
On Tue, Jan 6, 2009 at 6:54 PM, Manish Katiyar mkati...@gmail.com wrote:
On Tue, Jan 6, 2009 at 4:06 PM, Rohit Sharma imreckl
On Tue, Jan 6, 2009 at 10:43 PM, Manish Katiyar mkati...@gmail.com wrote:
On Tue, Jan 6, 2009 at 10:15 PM, Rohit Sharma imreckl...@gmail.com wrote:
On Tue, Jan 6, 2009 at 7:42 PM, rishi agrawal postri...@gmail.com wrote:
yes i suppose the donor inode is known
moreover the receiver inode's
, Rohit Sharma imreckl...@gmail.com wrote:
On Tue, Jan 6, 2009 at 10:43 PM, Manish Katiyar mkati...@gmail.com wrote:
On Tue, Jan 6, 2009 at 10:15 PM, Rohit Sharma imreckl...@gmail.com wrote:
On Tue, Jan 6, 2009 at 7:42 PM, rishi agrawal postri...@gmail.com wrote:
yes i suppose the donor inode
On Tue, Jan 6, 2009 at 10:58 PM, Manish Katiyar mkati...@gmail.com wrote:
On Tue, Jan 6, 2009 at 10:55 PM, Rohit Sharma imreckl...@gmail.com wrote:
We can find out no. of block currently being used by the donor inode,
The data we read from donor inode has to be in some buffer or page,
Since
On Tue, Jan 6, 2009 at 11:09 PM, Manish Katiyar mkati...@gmail.com wrote:
On Tue, Jan 6, 2009 at 11:06 PM, Rohit Sharma imreckl...@gmail.com wrote:
On Tue, Jan 6, 2009 at 10:58 PM, Manish Katiyar mkati...@gmail.com wrote:
On Tue, Jan 6, 2009 at 10:55 PM, Rohit Sharma imreckl...@gmail.com wrote
P. J. Day rpj...@crashcourse.ca
Subject: Re: ioctl()
To: Rohit Sharma imreckl...@gmail.com
Cc: rishi agrawal postri...@gmail.com, sharie...@yahoo.co.in, Kernel
newbies kernelnewbies@nl.linux.org
Date: Saturday, 3 January, 2009, 8:42 PM
On Sat, 3 Jan 2009, Rohit Sharma wrote:
ioctls are also
P. J. Day rpj...@crashcourse.ca wrote:
From: Robert P. J. Day rpj...@crashcourse.ca
Subject: Re: ioctl()
To: Rohit Sharma imreckl...@gmail.com
Cc: rishi agrawal postri...@gmail.com, sharie...@yahoo.co.in, Kernel
newbies kernelnewbies@nl.linux.org
Date: Saturday, 3 January, 2009, 8:42 PM
ioctls are also known as generic system calls. Its a simple switch
case implementation inside a device.
you send command and argument through ioctls as parameters.
Its a way you use to interact with the device itself.
for using it just open the device and use its fd to invoke ioctls.
for eg.
fd
That was a very nice explanation Greg, i had the concept that
we only suspend write requests during freeze. Thanks for clearing my doubt.
Rishi if you can state the purpose, why you want to freeze the file
system would be
more helpful.
On Thu, Jan 1, 2009 at 4:34 AM, Mark Brown
On Wed, Dec 31, 2008 at 5:53 PM, rohit vashist
rohitvashist2...@gmail.com wrote:
Hi
I want to know exactly what number of I/O operations are currenty being on
device,both for synchronous and asynchronous ? I went through aio.c and
found a relevant field for this in struct aio_setup_ring,thats
On Thu, Jan 1, 2009 at 1:08 AM, Rohit Sharma imreckl...@gmail.com wrote:
On Wed, Dec 31, 2008 at 5:53 PM, rohit vashist
rohitvashist2...@gmail.com wrote:
Hi
I want to know exactly what number of I/O operations are currenty being on
device,both for synchronous and asynchronous ? I went
May be remounting the file system in read only mode will help.
try this:
# mount -o remount,ro filesystem
On Wed, Dec 31, 2008 at 8:36 PM, rishi agrawal postri...@gmail.com wrote:
as far as i have understood it is not freezing the file system but it
is only freezing the write operation on
On Thu, Jan 1, 2009 at 2:04 AM, Rohit Sharma imreckl...@gmail.com wrote:
May be remounting the file system in read only mode will help.
try this:
# mount -o remount,ro filesystem
Yes this works, after remounting the file system in read only mode you
cant create new files and
you cant even
On Mon, Dec 22, 2008 at 6:22 AM, Peter Teoh htmldevelo...@gmail.com wrote:
On Sun, Dec 21, 2008 at 1:20 PM, Sandeep K Sinha
sandeepksi...@gmail.com wrote:
Thanks a lot Peter for taking out time and looking into the issue at
such a deeper level.
Thanks again,
u are welcome.it both my
This is a code snippet from find_group_orlov() in ialloc.c of ext2 fs
I am not able to figure out the percpu counters, why it is used.
if (ndirs == 0)
ndirs = 1; /* percpu_counters are approximate... */
blocks_per_dir = (le32_to_cpu(es-s_blocks_count)-free_blocks)
AM, Rohit Sharma imreckl...@gmail.com wrote:
in ext2/balloc.c
i saw a function ext2_new_blocks()
its the core function to allocate blocks, it has been specified there.
So all the blocks that are allocated in the file system is through
this function only ,
am i correct
A little confusion.
Just refer this structure in linux/ext2_fs_sb.h
struct ext2_block_alloc_info {
46/* information about reservation window */
47struct ext2_reserve_window_node rsv_window_node;
48/*
49 * was i_next_alloc_block in ext2_inode_info
50
Thanks for figuring it out. :)
It was a very helpful information.
On Sun, Dec 21, 2008 at 1:10 AM, Sandeep K Sinha
sandeepksi...@gmail.com wrote:
Hi Rohit,
On Sat, Dec 20, 2008 at 9:13 PM, Rohit Sharma imreckl...@gmail.com wrote:
A little confusion.
Just refer this structure in linux
On Fri, Dec 19, 2008 at 3:05 PM, Peter Teoh htmldevelo...@gmail.com wrote:
On Fri, Dec 19, 2008 at 3:42 PM, Rohit Sharma imreckl...@gmail.com wrote:
On Fri, Dec 19, 2008 at 4:09 AM, Jan Kara j...@suse.cz wrote:
On Fri, Dec 19, 2008 at 12:12 AM, Rohit Sharma imreckl...@gmail.com
wrote:
How
Is there a difference between how ext2 allocates block between
inode's indirect blocks and data blocks.
On Fri, Dec 19, 2008 at 8:59 PM, Peter Teoh htmldevelo...@gmail.com wrote:
On Fri, Dec 19, 2008 at 7:18 PM, Rohit Sharma imreckl...@gmail.com wrote:
On Fri, Dec 19, 2008 at 3:05 PM, Peter
How does ext2 allocate blocks for directory.
ext2_mkdir callsext2_make_empty
ext2_make_empty calls __ext2_write_begin
__ ext2_write_begin calls block_write_begin
my query is that how does this function allocates blocks for directories. ??
--
On Fri, Dec 19, 2008 at 12:12 AM, Rohit Sharma imreckl...@gmail.com wrote:
How does ext2 allocate blocks for directory.
ext2_mkdir callsext2_make_empty
ext2_make_empty calls __ext2_write_begin
__ ext2_write_begin calls block_write_begin
On Fri, Dec 19, 2008 at 4:09 AM, Jan Kara j...@suse.cz wrote:
On Fri, Dec 19, 2008 at 12:12 AM, Rohit Sharma imreckl...@gmail.com wrote:
How does ext2 allocate blocks for directory.
ext2_mkdir callsext2_make_empty
ext2_make_empty calls
I think Clists are used in tty read. Its a list of Cblocks.( C stands
for character).
They are meant to read from slower devices.
Whenever you enter or read characters, Cblocks hold the data
CBlocks are again a list of character and the head shows the start of
valid data.
for eg :4,8 | 0 |
On Mon, Sep 29, 2008 at 10:54 PM, Sunil [EMAIL PROTECTED] wrote:
On Mon, Sep 29, 2008 at 8:03 PM, Rohit Sharma [EMAIL PROTECTED] wrote:
Not an assignment actually, but a project.
We are working on open hierarchical storage management, in which we
store files on disks according to different
on disk 2, then we
place them accordingly in different disks.
On Mon, Sep 29, 2008 at 2:31 AM, Theodore Tso [EMAIL PROTECTED] wrote:
On Sun, Sep 28, 2008 at 03:49:04PM +0530, Rohit Sharma wrote:
Suppose i have a file named abc.txt and i want to specify that
all the *.txt files must be allocated
Suppose i have a file named abc.txt and i want to specify that
all the *.txt files must be allocated between block groups no. 100 -
200 in ext2 fs.
Is there a way to do this?
can we modify function ext2_new_inode and find_group_orlov for this?
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I am interested in getting the vfsmount structure of the mounted file
system from my module.
I used filp = get_empty_filp() (filp is file pointer)
function to create an empty file object (as this contains pointer to
vfsmount structure)
file object has a field f_vfsmnt which points to the vfsmount
I want to read ext2 inode.
Its just like i have a inode no. say 1900..
so from the block group we can read the group descriptor and from there we
can identify the first block no. of the inode table.
So we can read the required inode no.i.e. 1900 from this inode table.
I found that there are 8176
there. Any other method in kernel space??
Regards,
Ashish
--- On Mon, 15/9/08, Rohit Sharma [EMAIL PROTECTED] wrote:
From: Rohit Sharma [EMAIL PROTECTED]
Subject: reading superblock
To: Kernelnewbies kernelnewbies@nl.linux.org
Cc: ext4 [EMAIL PROTECTED]
Date: Monday, 15 September, 2008, 10
-- Forwarded message --
From: Rohit Sharma [EMAIL PROTECTED]
Date: Wed, Sep 10, 2008 at 10:57 PM
Subject: Re: Request queues and bio structures
To: Peter Teoh [EMAIL PROTECTED]
What i figured out is when a request for reading blocks is made
then two possibilities are there
1
I am trying to build my own profiler for kernel module,
I have thought of creating a deamon that will profile
any kernel module that is invoked, by monitoring the resources
like memory usage, time stamp, etc, at that time.
Deamon will be invoked when inserting our module with insmod -d
And i
Is there a way to find out which function is being called
by examining executabls files or binary files ?
i think we can do that but not able to figure out how.
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Please read the FAQ at
I was going through the function ext2_find_near in inode.c and could not
interpret the meaning of the last part of this code :
static ext2_fsblk_t ext2_find_near(struct inode *inode, Indirect *ind)
{
struct ext2_inode_info *ei = EXT2_I(inode);
__le32 *start = ind-bh ? (__le32 *)
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