On Mon, 2002-03-04 at 10:12, Alan Cox wrote:
> > Modifying unlink will probably suffice.
I am working on a preliminary patch that does this. My current
implementaion (which is not ready to submit-- but works) added a line to
sys_unlink in fs/namei.c that calls my vfs_undel_link(). The
vfs_undel_link() function is based on the logic of sys_link, and creates
a hard link from the deleted file to one in the "stuff we deleted"
directory. Then vfs_undel_link returns to sys_unlink and original link
is deleted, leaving only the one in the "stuff we deleted" directory.
> You would need to hook the truncate/unlink paths in the file system. If=20
> you are doing it within the fs it becomes cheap (at least for ext2) - as
> you can simply reassign the data blocks to a new inode, stuff the new ino=
de
> into the magic "stuff we deleted" directory and continue.
After much consideration, my implementation does not deal with
truncate/overwrite because it would fill up the filesystem and be very
slow in VFS since there would have to be a full copy. Also, staying
high level in VFS makes the patch work over any fs that uses VFS.
When I submit, I will make sure to add RFC to get more input on the
implementation, and possibly dealing with truncate.
Jamie Strandboge
--=20
Email: jstrand1@rochester.rr.com
GPG/PGP ID: 26384A3A
Fingerprint: D9FF DF4A 2D46 A353 A289 E8F5 AA75 DCBE 2638 4A3A
--=-41a3W+kYbLAamlG3WB4w
Content-Type: application/pgp-signature; name=signature.asc
Content-Description: This is a digitally signed message part
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.6 (GNU/Linux)
Comment: For info see http://www.gnupg.org
iEYEABECAAYFAjyDyDoACgkQqnXcviY4SjoBNgCdFwvcou1UcIkXksPPvc1nTmaU
NA0AnjU3feJAZFknV2I35vHz8ka6Kz4x
=t9LS
-----END PGP SIGNATURE-----
--=-41a3W+kYbLAamlG3WB4w--
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/