On Wed, Nov 21, 2012 at 10:26:01AM -0500, Brian Foster wrote: > On 11/20/2012 05:22 PM, Dave Chinner wrote: > > On Tue, Nov 20, 2012 at 04:25:34PM -0500, Brian Foster wrote: > >> Otherwise, unless I'm mistaken it sounds like we can use the existing > >> eofblocks scan on user/group EDQUOT situations. > > > > That we can. And for the project case, it's a simply and extra flag > > and a call to filemap_flush() to do an async writeback before > > trimming the specualtive preallocation. > > This makes sense generally. I'll need to dig further into this code to > wrap my head around it. If my current understanding is correct, it > sounds like we could do the same thing in general, non-quota ENOSPC > handling, right? E.g., an unfiltered eofblocks scan (plus the flush bit) > followed by a retry, rather than a complete flush of all dirty inodes. Possibly, though we can also have dirty inodes that don't have speculative prealloc (e.g. hole filling writes) and we really need to flush them at ENOSPC, too. In general, I think the real ENOSPC case needs the big hammer because we have to reclaim every last piece of unnecessary reservation as possible to allow anything to proceed. Porject quota ENOSPC isn't such a problem here, as there's still other free space in the filesystem that allow normal operation to take place... Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
