Hello Dmitry, Dmitry Nezhevenko: > For added/modified files it should be enough to just move and overwrite > all files from 'rw' to 'ro'. But I also want to correctly process > removed files as well as symlinks.=20 > > Any ideas?
Here is a rather rude but simple way. - flush all the pseudo-links - find the all whiteouts on rw, except '.wh..wh.*' (if you don't know what the whiteout is, refer to the aufs manual or unionfs manual) - remove the whiteouted or opaqued entries on ro - remove the whiteouts on rw - 'mount -o remount /tmp/aufs/total' - these direct access to rw/ro, eg. bypassing aufs, will not be detected by aufs until you execute the last remount. - if a file is in use, aufs may not detect/refresh the info about the file even if you execute the last remount. If you don't want to be rude, try another but slower way. - enable CONFIG_INOTIFY and CONFIG_AUFS_HINOTIFY - flush all the pseudo-links - 'mount -o remount,udba=inotify /tmp/aufs/total' just before the work (about udba= option, refer to the aufs manual) - remove the whiteouted or opaqued entries on ro - remove the whiteouts on rw - 'mount -o remount,udba=reval /tmp/aufs/total' just after the work - these direct access to rw/ro, eg. bypassing aufs, will be detected by aufs in time even the file is in use. In both cases, the access to /tmp/aufs/total will not block. It means that a new whiteout or pseudo-link may be created while you are working. Junjiro R. Okajima ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/
