Andreas Dilger <adilger@xxxxxxxxxxxxx> writes in gmane.linux.file-systems: > On Dec 01, 2006 13:07 -0500, Trond Myklebust wrote: > > > The more interesting case is multiple clients in the same directory. In > > > order to provide strong consistency, both stat() and readdir() have to > > > talk to the server (or more complicated leasing mechanisms are needed). > > > > Why would that be interesting? What applications do you have that > > require strong consistency in that scenario? I keep looking for uses for > > strong cache consistency with no synchronisation, but I have yet to meet > > someone who has an actual application that relies on it. > > To be honest, I can't think of any use that actually _requires_ consistency > from stat() or readdir(), because even if the data was valid in the kernel > at the time it was gathered, there is no guarantee all the files haven't > been deleted by another thread even before the syscall is complete. Any > pretending that the returned data is "current" is a pipe dream. But I can think that it is assumed other kind consistency: All fields of stat refers to same state and moment of file. > Cheers, Andreas > -- > Andreas Dilger > Principal Software Engineer > Cluster File Systems, Inc. / Kari Hurtta - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
