Hello All,
I am working on a file system, that uses page cache only if a file is
memory mapped. This is how the code is designed
write()
{
write the data onto the disk
if (file not memory mapped)
return;
/* file is memory mapped */
while (till all data is not syced
On Mon, Dec 13, 2010 at 7:44 AM, onlyfever onlyfe...@gmail.com wrote:
2010/12/9, Prasad Joshi prasadjoshi...@gmail.com:
Thanks a lot for your reply.
On Thu, Dec 9, 2010 at 1:06 AM, Alexandre Courbot gnu...@gmail.com wrote:
Hi,
There is probably a kernel misconfiguration somewhere. Could you
On Mon, Dec 13, 2010 at 7:53 AM, Prasad Joshi prasadjoshi...@gmail.com wrote:
On Mon, Dec 13, 2010 at 7:44 AM, onlyfever onlyfe...@gmail.com wrote:
2010/12/9, Prasad Joshi prasadjoshi...@gmail.com:
Thanks a lot for your reply.
On Thu, Dec 9, 2010 at 1:06 AM, Alexandre Courbot gnu...@gmail.com
On Thu, Dec 9, 2010 at 7:41 PM, Mulyadi Santosa
mulyadi.sant...@gmail.com wrote:
On Fri, Dec 10, 2010 at 02:06, Prasad Joshi prasadjoshi...@gmail.com wrote:
After trying most of the block devices to boot the kernel under QEMU,
I added few printks around the code that does the mounting
Thanks a lot for your reply.
On Thu, Dec 9, 2010 at 1:06 AM, Alexandre Courbot gnu...@gmail.com wrote:
Hi,
There is probably a kernel misconfiguration somewhere. Could you post your
.config, and maybe even your vmlinux somewhere where we can download it?
Yes it was misconfiguration. I had
On Thu, Dec 9, 2010 at 12:34 PM, Alexandre Courbot gnu...@gmail.com wrote:
Also, you can use QEmu's GDB server in order to see exactly where your
kernel stops executing. This should be much more comfortable than putting
printfs into QEmu's code. If you don't know how it works, look here for
On Thu, Dec 9, 2010 at 1:54 PM, Alexandre Courbot gnu...@gmail.com wrote:
$ qemu-system-arm -M realview-pbx-a9 -kernel clfskernel-2.6.36 -hda
initrd-rootfs.img -append console=ttyAMA0 root=/dev/hda1 ro mem=256M
-m 1024 -nographic
...
VFS: Cannot open root device hda1 or unknown-block(0,0)
and Regards,
Prasad
On Thu, Dec 9, 2010 at 2:27 PM, Prasad Joshi prasadjoshi...@gmail.com wrote:
On Thu, Dec 9, 2010 at 1:54 PM, Alexandre Courbot gnu...@gmail.com wrote:
$ qemu-system-arm -M realview-pbx-a9 -kernel clfskernel-2.6.36 -hda
initrd-rootfs.img -append console=ttyAMA0 root=/dev/hda1
Hello All,
I built an arm-linux kernel and trying to boot it using QEMU. But it
stalls after showing 'Uncompressing Linux...'
$ qemu-system-arm -M realview-pbx-a9 -kernel clfskernel-2.6.36 -initrd
rootfs.gz -append console=ttyAMA0 root=/dev/sda1 rw
ramdisk_size=32678 -m 256 -nographic
Hello All,
I was looking at the TODO list on KVM wiki. Here are two TODO I could
not understand at all.
1. O(1) write protection by protecting the PML4Es, then on demand
PDPTEs, PDEs, and PTEs
2. O(1) mmu invalidation using a generation number
what is MMU invalidation? Why is it needed?
Could
Could you please describe when did this happen?
Also paste the output of the command uname -a
On Thu, Oct 14, 2010 at 12:24 PM, Amit Nagal helloin.a...@gmail.com wrote:
Hi ,
i am getting this kernel log .
BUG: sleeping function called from invalid context at mm/slab.c:3055
in_atomic(): 1,
On Fri, Jun 18, 2010 at 1:19 PM, Manish Katiyar mkati...@gmail.com wrote:
On Fri, Jun 18, 2010 at 10:11 AM, Prasad Joshi prasadjoshi...@gmail.com
wrote:
Hi All,
I am trying to understand a a kernel oops report. Here are some of the
fields from the report
BUG: unable to handle kernel
Hi All,
I am working on a block device driver, like standard loop device, I am
adding every new IO request in a bio list. The code looks something like
this
make_request()
{
bio_list_add();
wakeup_thread();
}
thread()
{
bio = get new bio()
of mount manpage does not mention
blocksize option.
Is there anyway I can create ext2 filesystem with blocksize 8192?
Thanks and Regards,
Prasad
On Thu, Oct 8, 2009 at 6:41 PM, Manish Katiyar mkati...@gmail.com wrote:
On Thu, Oct 8, 2009 at 12:38 PM, Prasad Joshi prasadjoshi...@gmail.com
wrote:
Hi
On Fri, Oct 9, 2009 at 11:34 AM, Manish Katiyar mkati...@gmail.com wrote:
On Fri, Oct 9, 2009 at 11:28 AM, Manish Katiyar mkati...@gmail.com wrote:
On Fri, Oct 9, 2009 at 11:16 AM, Prasad Joshi prasadjoshi...@gmail.com
wrote:
Thanks Manish,
The issue was with filesystem creation
Hi All,
I am working on Porting of a windows device driver to Linux. Windows has a
notion of Queued Spinlock. I could not understand how it is different than
normal spinlock, the document says it is faster than a normal spinlock.
If any one is having more information on Queued Spinlock, please
On Thu, Aug 6, 2009 at 5:45 PM, Belisko Marek marek.beli...@gmail.comwrote:
Hi,
On Thu, Aug 6, 2009 at 1:04 PM, Prasad Joshiprasadjoshi...@gmail.com
wrote:
Hi All,
I am porting a Windows device driver to Linux.
I defined a macro for CONTANING_RECORD like
#define
Hi All,
I am porting a Windows device driver to Linux.
I defined a macro for CONTANING_RECORD like
#define CONTAINING_RECORD(ptr, type, member) list_entry((ptr), (type),
(member))
When i compiled my module, i got following errors
*$ make 21 | grep 1132*
alloc.c:1132: error: expected
Hi All,
I am working on a block device (something similar to the loop device). The
block device is associated with a file. So every write or read on block
device is intern scheduled to the backing file. Very much similar to the
loop device.
But, I also need to submit a page full of IOs from the
Hi Sandeep,
Thanks a lot for your reply
On Tue, Jul 21, 2009 at 4:12 PM, SandeepKsinhasandeepksi...@gmail.com wrote:
Hi Prasad,
On Tue, Jul 21, 2009 at 12:14 PM, Prasad Joshi prasadjoshi...@gmail.com
wrote:
Hi All,
I am working on a block device (something similar to the loop device
Hi All,
code flow of the fork() till dup_mm()
do_fork ()
copy_process
copy_mm
dup_mm
allocates memory to hold struct mm_struct
memcpy(mm, current-oldmm, sizeof(*mm));
On Fri, Oct 24, 2008 at 2:44 PM, Rene Herman [EMAIL PROTECTED]wrote:
On 24-10-08 09:25, Prasad Joshi wrote:
My understanding is when a process does a fork
1. a new page table will be allocated to the process
2. it will be exactly same copy of the parent process
3. both the page tables
Hi,
I need a FUSE API documentation, I tried googling it but did not found one.
If anyone is knows the location please pass it to me.
Thanks and Regards,
Prasad
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On Sat, Sep 6, 2008 at 7:12 PM, Steven Zhou [EMAIL PROTECTED] wrote:
Hi guys,
I'm a newbie about Linux driver developing, and now I'm studying the Linux
driver model.
I have refered the book Understanding the Linux Kernel, but... I'm still
Hi All,
I want register the character device with sysfs and want a device file to be
created. The function device_create() does the same, but it seems to be
failing in my case.
Here is the part of the code
#define MYMAJOR 200
struct mydevice {
struct device *parent;
struct device
On Wed, Aug 20, 2008 at 11:05 AM, Sachin Gaikwad [EMAIL PROTECTED]wrote:
Hi Prasad,
On Wed, Aug 6, 2008 at 6:50 PM, Prasad Joshi [EMAIL PROTECTED]
wrote:
Hi All,
I want to encrypt the data before it is written to the disk and decrypt
is
after it is being read from the disk. so copied
On Wed, Aug 20, 2008 at 11:05 AM, Sachin Gaikwad [EMAIL PROTECTED]wrote:
Hi Prasad,
On Wed, Aug 6, 2008 at 6:50 PM, Prasad Joshi [EMAIL PROTECTED]
wrote:
Hi All,
I want to encrypt the data before it is written to the disk and decrypt
is
after it is being read from the disk. so copied
Hi All,
I am getting this error after starting the UML.
[EMAIL PROTECTED]:~/linuxsrc/linux-2.6.26-rc5_uml$ ./linux mem=128
ubda=/mnt/
Locating the top of the address space ... Address 0x0 no good?
This is the first time I am using UML
Steps I did in the linux source directory
1. make mrproper
Hi Jovi,
/* this is the data variable where we receive the data written by sysctl
interface */
static char event_handler[256];
static struct ctl_table_header *handler_header_table;
static struct ctl_table my_event_table[] = {
{
.ctl_name = KERN_EVENT_HANDLER,/* this
Hi All,
I need some documentation on calling user mode program from the kernel
space. While searching I came to know the function call_usermodehelper().
But I am not finding good documentation on how to use it.
Can someone please give me some pointers?
Thanks and Regards,
Prasad.
Hi All,
I want to encrypt the data before it is written to the disk and decrypt is
after it is being read from the disk. so copied the ext2 source code in my
directory.
Then modified the ext2 file_operations structure to invoke my read and write
functions instead of do_sync_read/write
const
do you need to obtain a list of available filesystems from a driver?
Shouldn't you handle this in an application instead?
Best Regards,
-- Mark
On Aug 3, 2008, at 10:04 PM, Rene Herman wrote:
On 04-08-08 03:59, Prasad Joshi wrote:
I am using 2.6.26 kernel.
Can you please explain, why
On Tue, Aug 5, 2008 at 11:41 AM, Rene Herman [EMAIL PROTECTED]wrote:
On 05-08-08 07:51, Prasad Joshi wrote:
Thanks a lot Rene and Mark,
I am in a phase of learning the Linux Device Drivers. I am trying to write
a KDB module. This will add a new command in KDB to display the registered
On Sun, Aug 3, 2008 at 10:34 PM, Rene Herman [EMAIL PROTECTED]wrote:
On 03-08-08 17:44, Prasad Joshi wrote:
I am calling a function get_filesystem_list() from a module which I am
writing. During the compilation I am getting the error
WARNING: get_filesystem_list [module name] undefined
Hi All,
I am facing a problem where link count is not getting properly updated in
the debugfs. I am using e2fsprogs.
[EMAIL PROTECTED] debugfs]# mkfs -t ext2 /dev/ram0
mke2fs 1.40.10 (21-May-2008)
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
4096 inodes,
.
Thanks and Regards,
Prasad.
On Fri, May 30, 2008 at 11:54 AM, Manish Katiyar [EMAIL PROTECTED] wrote:
On Fri, May 30, 2008 at 11:31 AM, Prasad Joshi [EMAIL PROTECTED]
wrote:
Hi All,
I am facing a problem where link count is not getting properly updated in
the debugfs. I am using
Yes, I read the code
On Wed, May 28, 2008 at 5:44 PM, Manish Katiyar [EMAIL PROTECTED] wrote:
On Wed, May 28, 2008 at 5:43 PM, Manish Katiyar [EMAIL PROTECTED]
wrote:
On Wed, May 28, 2008 at 5:06 PM, Prasad Joshi [EMAIL PROTECTED]
wrote:
Thanks a lot for all the replies.
I am able
On Wed, May 28, 2008 at 6:45 PM, Manish Katiyar [EMAIL PROTECTED] wrote:
On Wed, May 28, 2008 at 5:55 PM, Prasad Joshi [EMAIL PROTECTED]
wrote:
Yes, I read the code
On Wed, May 28, 2008 at 5:44 PM, Manish Katiyar [EMAIL PROTECTED]
wrote:
On Wed, May 28, 2008 at 5:43 PM, Manish
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