From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from frost.carfax.org.uk ([85.119.82.111]:54068 "EHLO frost.carfax.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751602AbaCHWA3 (ORCPT ); Sat, 8 Mar 2014 17:00:29 -0500 Date: Sat, 8 Mar 2014 22:00:27 +0000 From: Hugo Mills To: Josef Bacik Cc: Btrfs mailing list Subject: Re: send/receive locking Message-ID: <20140308220027.GF6318@carfax.org.uk> References: <20140308215350.GE6318@carfax.org.uk> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="eDB11BtaWSyaBkpc" In-Reply-To: Sender: linux-btrfs-owner@vger.kernel.org List-ID: --eDB11BtaWSyaBkpc Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Sat, Mar 08, 2014 at 09:55:50PM +0000, Josef Bacik wrote: > Hey Hugo will you try the danger branch on btrfs-next, Wang changed the locking a bit. Thanks, Sure. I'll build a kernel tonight and report tomorrow. I'm not sure how repeatable the problem is, though. I'll see if I can quantify that, too. Hugo. > Josef > > Hugo Mills wrote: > > > Is there anything that can be done about the issues of btrfs send > blocking? I've been writing a backup script (slowly), and several > times I've managed to hit a situation where large chunks of the > machine grind to a complete halt in D state because the backup script > has jammed up. > > Now, I'm aware that you can't send and receive to the same > filesystem at the same time, and that's a restriction I can live with. > However, having things that aren't related to the backup process > suddenly stop working because the backup script is trying to log its > progress to the same FS it's backing up is... umm... somewhat vexing, > to say the least. > > Is this a truly fundamental property of send/receive, or is there > likely to be a simple(ish) solution? > > Hugo. > -- === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk === PGP key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk --- Well, you don't get to be a kernel hacker simply by looking --- good in Speedos. -- Rusty Russell --eDB11BtaWSyaBkpc Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIVAwUBUxuS+1heFHXiqx3kAQKurA//VcyoGwCU3Pzg51O/JRz+ACA2S67TtNWB zS423A5QkioHWEKONxk55D09SsbxRDua2vebi6yrWhN9KGX3SCxZNFX5ycY/i/1I ElnJOfGhzwT6tn/inTC5HGyK61OQr8s2BxSf3kBSV4gDeWGZz76ngQMsXPvo1DIg YbVRwOR8n8WZD8mYPNMM7LuWa/6+ow0wim/jTfqE7eKGMu/vman6VgpLKlx5miEr mby5XBZUxlOhDsTcOye7IPCR0G2485MbbjXgwsjAOcxXdD/76ajCtCKsiQQXYNdi 4dTljdgIxPVkgjCNG9HpcK4i7mJB/AdK2XkN4COWsHvQy15Ci8HDCIfTwA6iMQLT 7D985AroDnB8UIHjHcRUDlnSZfjt05vjvhaMElkrQSNvbCOh3Zz+CECI1fECPtkO NN/77M3A6e5KM2nP2zBIid3osUs/qgkI7D7oEs/2IJZnwMvIXLkalcQIbW4eyAk2 yWvRDuGgyqOgSlVAI1oQqGbIVkxPiF/K+UotLSVCT+E5JHyUF571FasLcPIv9prD KYin7qI3aeIJs6Oav3sqQ74a9Sspy3TNfxvTmYLqH0Rjp1t5Kd3REyOxQ2aTb6uu 8pNjLLBZy0/naMJOWoLHhkFfocLkfqF9aRVs/Tp9/Dvh4U/rbIS/SFJuRzeFZxHE FBjXASa9n3Q= =uuqZ -----END PGP SIGNATURE----- --eDB11BtaWSyaBkpc--