From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cantor2.suse.de ([195.135.220.15]:34851 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752554AbbFKQG4 (ORCPT ); Thu, 11 Jun 2015 12:06:56 -0400 From: David Sterba To: stable@vger.kernel.org Cc: David Sterba , linux-btrfs@vger.kernel.org, clm@fb.com Subject: [PATCH 7/7] Btrfs: fix regression in raid level conversion Date: Thu, 11 Jun 2015 18:06:51 +0200 Message-Id: <25c5856aa419479bb07466fd7d0de01da0b7b421.1434037853.git.dsterba@suse.cz> In-Reply-To: References: Sender: stable-owner@vger.kernel.org List-ID: From: Chris Mason Commit 2f0810880f082fa8ba66ab2c33b02e4ff9770a5e changed btrfs_set_block_group_ro to avoid trying to allocate new chunks with the new raid profile during conversion. This fixed failures when there was no space on the drive to allocate a new chunk, but the metadata reserves were sufficient to continue the conversion. But this ended up causing a regression when the drive had plenty of space to allocate new chunks, mostly because reduce_alloc_profile isn't using the new raid profile. Fixing btrfs_reduce_alloc_profile is a bigger patch. For now, do a partial revert of 2f0810880, and don't error out if we hit ENOSPC. Signed-off-by: Chris Mason Tested-by: Dave Sterba Reported-by: Holger Hoffstaette [adapted for stable kernel branch, v4.0.5] Signed-off-by: David Sterba --- fs/btrfs/extent-tree.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 8b33da6ec3dd..63be2a96ed6a 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -8535,6 +8535,24 @@ int btrfs_set_block_group_ro(struct btrfs_root *root, trans = btrfs_join_transaction(root); if (IS_ERR(trans)) return PTR_ERR(trans); + /* + * if we are changing raid levels, try to allocate a corresponding + * block group with the new raid level. + */ + alloc_flags = update_block_group_flags(root, cache->flags); + if (alloc_flags != cache->flags) { + ret = do_chunk_alloc(trans, root, alloc_flags, + CHUNK_ALLOC_FORCE); + /* + * ENOSPC is allowed here, we may have enough space + * already allocated at the new raid level to + * carry on + */ + if (ret == -ENOSPC) + ret = 0; + if (ret < 0) + goto out; + } ret = set_block_group_ro(cache, 0); if (!ret) -- 2.1.3