Hello, On Fri 09-03-12 14:40:22, Andor Daam wrote: > Is it ever possible for a superblock for a mounted filesystem to be > free'd without a previous call to unmount the filesystem? No, I don't think so (well, except for cases where we do not manage to fully setup the superblock). But be aware that mount/umount need not be really the entry points you are looking for since filesystem can be mounted several times. Rather deactivate_locked_supers() is the place you are looking for... > I need to be certain that the function cleancache_invalidate_fs, which is > at the moment called by deactivate_locked_super (fs/super.c) [1], is > called before every free on a superblock of cleancache-enabled > filesystems. Is this already the case or are there situations in which > this does not happen? > > It would be interesting to know this, as we are planning to have > cleancache save pointers to superblocks of every mounted > cleancache-enabled filesystem [2] and it would be fatal if a > superblock is free'd without cleancache being notified. Honza -- Jan Kara <jack@xxxxxxx> SUSE Labs, CR -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>