On Fri, Mar 5, 2010 at 6:37 AM, nidhi mittal hada <[email protected]> wrote: > > hi all > I created a loop device > /dev/loop0 ------------>with the image file ---------->file.img > then > mkfs and > mount /dev/loop0 to /mnt > > cd /mnt > created files a.c , b.c > rm file.img ------- removed file.img > > cd /mnt > still i am able to see a.c b.c here > How are these files present here ? > they should have been deleted as underlying storage file is no where present > !!
Nidhi, For this think of rm as what it really is "unlink". When you unlink a file all that happens is the directory entry for that link is tagged as deleted / reusable, and the link count field in the inode is decremented by one. After the decrement there is code to do: if (inode.link_count == 0 and inode.is_open == 0) then delete inode and associated data blocks. When your loop mount is unmounted it should close the fd associated with the image file and invoke the above logic again which I assume at that point will cause the inode and data blocks to be freed up. Greg -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to [email protected] Please read the FAQ at http://kernelnewbies.org/FAQ
