On Apr 17, 2002 21:41 +0100, Stephen C. Tweedie wrote: > On Sun, Apr 14, 2002 at 08:07:19AM -0500, John Fraser wrote: > > We are working on an application that needs to grab files put onto an ext3 > > filesystem as soon as they are written. We've looked at lsof, and other > > tools, and are having troubles finding just the right mechanism to tell when > > a file has been completely written and the other process has closed the > > file. > > There isn't one, basically. > > > allow NFS users to put files onto the ext3 filesystem. In both cases, we > > need low-level knowledge of when the file is written completely so we can > > grab the sucker right away. > > No such interface exists, but you have the source, you could write one! Well, see my post/patch yesterday on ext2-devel about adding transaction handle IDs to ext3/JBD. This allows you to find out asynchronously when a given transaction has been committed to disk, instead of doing sync I/O. It isn't very complex (i.e. no callbacks, and will probably need to be redone when journal devices can be shared) but it is enough for us. Cheers, Andreas -- Andreas Dilger http://www-mddsp.enel.ucalgary.ca/People/adilger/ http://sourceforge.net/projects/ext2resize/
