Actually I want the option for writing both random bits and zeroes to the data blocks. I wanted to know about how I can write them to the data blocks. I tried the following at the user space: char *data; memset(data, 0, 4096); fprintf(fp, "%s", data); The program causes a segfault when I am trying to write the zeroed buffer onto a file. Could you let me know how I can access the data blocks directly using inode->i_blocks? I could not find the API which could use this field for accessing the data blocks. Thanks, Avinash. On 7/9/06, Arjan van de Ven <arjan@xxxxxxxxxxxxx> wrote:
On Sat, 2006-07-08 at 18:56 -0700, Avinash Ramanath wrote: > I am trying to zero data blocks whenever an unlink is invoked as part > of a secure delete filesystem. [ Hi, just a question... how secure do you want to be? (just asking because zeros might not be the best pattern when protecting against government type use :) > I tried to zero the file by writing a buffer (of file size) with > zeroes onto the file. that's not so nice since there is no guarantee that the filesystem or the disk won't remap the data blocks underneath you...
-- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
