Hi,
>
>> Then just say mark_buffer_dirty(bh).
>> "sync_dirty_buffer()" is to sync dirty buffer to
>> disk instantly, which otherwise, would be done by
>> bdflush deamon at regular intervels.
>
> sync_dirty_buffer works great on
> non-journaling/non-data logging fs.
> b_data indeed pointing to the data of the files in
> there. Thanks for the pointer.
>
A buffer head (struct buffer_head) contains pointer to data block in memory (char * b_data). A page has number of buffers mapped to it. So its like :
list
| _________________ _______________
---> | | ---> | | --->
| Buffer Head 0 | | Buffer Head 0 | NULL
|_________________| |_______________|
| | | |
| Buffer Head 1 | | Buffer Head 1 |
|_________________| |_______________|
| | | |
| ... | | ... |
|_________________| |_______________|
| | | |
| Buffer Head n | | Buffer Head m |
|_________________| |_______________|
Page 0 Page 1
Actual data is pointed to by buffer heads.
So just marking the buffer dirty and syncing it will do your job.
void commit_to_disk (struct buffer_head * bh)
{
mark_buffer_dirty (bh);
wakeup_bdflush (); // to sync immediately
}
Nitin
--
Kernelnewbies: Help each other learn about the Linux kernel.
Archive: http://mail.nl.linux.org/kernelnewbies/
FAQ: http://kernelnewbies.org/faq/
