Hello Wang, On 03/31/13 03:44, Wang Shilong wrote: > Hello Arne, Jan, > > When i run stresstest with quota enabled, i hit a panic where > btrfs_find_all_roots() is called. Would you please double check it. >
On what kernel version do you hit this (git commit id preferred)? Can you send us the message from dmesg? Thanks, arne > stresstest -n 10000 -t 4. > > Maybe there is still race condition when walking backref trees, Jan > would you please check the backref.c .. > btrfs_find_all_roots() is called in btrfs_qgroup_account_ref () to find > all roots that reference a extent. I think this is called because > > we introduce referenced/exclusive concepts. The point is that i think > this concept's disadvantages outweigh the advantages: > <1> > walking backref tree is really time-consuming. > <2> referenced/exclusive makes it really complex when snapshot happens. > <3> quota has a high coupling with other module. > I'd prefer to just keep referenced value, it is not be elegant, but > it helps more. > > Thanks, > Wang > > > > > -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
