On Wed, Oct 1, 2008 at 12:59 PM, Theodore Tso <tytso@xxxxxxx> wrote: > On Wed, Oct 01, 2008 at 12:18:21PM -0600, Chris Worley wrote: >> >> I was perusing David Woodhouse's 2.6.27-rc2 kernel at >> git://git.infradead.org/users/drzeus/discard-2.6.git, and noticed he >> has the discard built-in to where I was talking about for ext2... so I >> coded our driver to handle discards, and it works very nicely!!! > > I'm not sure what you mean by "our driver"? Our driver for the ioDrive: http://fusionio.com/Products.aspx So far, all I've implemented is the "discard" in the read/write callback; no barrier, no ioctl. > >> The journaling issue you raise is not a show-stopper on the block >> device side: if the block device has to maintain a couple of blocks >> that are not really in use, it's no big deal (eventually the blocks >> will be re-written and the universe will be in order again)... for the >> users, I can understand if the discard is preserved on the block >> device, while the fs still thinks there's good data in there (we'll >> give you back all zeros on read). > > It's no issue on the block device side at all, but from the user's > point of view it can be quite disastrous. <snip> Maybe that should effect the priority of implementation for ext[34]? Chris _______________________________________________ Ext3-users mailing list Ext3-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/ext3-users
