From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Fasheh Subject: Re: [PATCH 6/7] btrfs: Don't BUG_ON alloc_path errors in find_next_chunk Date: Mon, 25 Jul 2011 14:37:51 -0700 Message-ID: <20110725213751.GF6911@wotan.suse.de> References: <1311277713-7747-1-git-send-email-mfasheh@suse.com> <1311277713-7747-2-git-send-email-mfasheh@suse.com> <1311277713-7747-3-git-send-email-mfasheh@suse.com> <1311277713-7747-4-git-send-email-mfasheh@suse.com> <1311277713-7747-5-git-send-email-mfasheh@suse.com> <1311277713-7747-6-git-send-email-mfasheh@suse.com> <1311277713-7747-7-git-send-email-mfasheh@suse.com> <4E28CAA0.2070801@jp.fujitsu.com> Reply-To: Mark Fasheh Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-btrfs@vger.kernel.org, chris.mason@oracle.com To: Tsutomu Itoh Return-path: In-Reply-To: <4E28CAA0.2070801@jp.fujitsu.com> List-ID: On Fri, Jul 22, 2011 at 09:56:00AM +0900, Tsutomu Itoh wrote: > > diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c > > index aa91773..ff339b2 100644 > > --- a/fs/btrfs/extent-tree.c > > +++ b/fs/btrfs/extent-tree.c > > @@ -3277,6 +3277,9 @@ again: > > } > > > > ret = btrfs_alloc_chunk(trans, extent_root, flags); > > + if (ret < 0 && ret != -ENOSPC) > > + return ret; > > + > > You need mutex_unlock() before return. Of course... Here's an updated patch (git tree has also been updated). Thanks, --Mark -- Mark Fasheh From: Mark Fasheh [PATCH] btrfs: Don't BUG_ON alloc_path errors in find_next_chunk I also removed the BUG_ON from error return of find_next_chunk in init_first_rw_device(). It turns out that the only caller of init_first_rw_device() also BUGS on any nonzero return so no actual behavior change has occurred here. do_chunk_alloc() also needed an update since it calls btrfs_alloc_chunk() which can now return -ENOMEM. Instead of setting space_info->full on any error from btrfs_alloc_chunk() I catch and return every error value _except_ -ENOSPC. Thanks goes to Tsutomu Itoh for pointing that issue out. Signed-off-by: Mark Fasheh --- fs/btrfs/extent-tree.c | 4 ++++ fs/btrfs/volumes.c | 6 ++++-- 2 files changed, 8 insertions(+), 2 deletions(-) diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index aa91773..f6af423 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -3277,6 +3277,9 @@ again: } ret = btrfs_alloc_chunk(trans, extent_root, flags); + if (ret < 0 && ret != -ENOSPC) + goto out; + spin_lock(&space_info->lock); if (ret) space_info->full = 1; @@ -3286,6 +3289,7 @@ again: space_info->force_alloc = CHUNK_ALLOC_NO_FORCE; space_info->chunk_alloc = 0; spin_unlock(&space_info->lock); +out: mutex_unlock(&extent_root->fs_info->chunk_mutex); return ret; } diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 530a2fc..90d956c 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -1037,7 +1037,8 @@ static noinline int find_next_chunk(struct btrfs_root *root, struct btrfs_key found_key; path = btrfs_alloc_path(); - BUG_ON(!path); + if (!path) + return -ENOMEM; key.objectid = objectid; key.offset = (u64)-1; @@ -2663,7 +2664,8 @@ static noinline int init_first_rw_device(struct btrfs_trans_handle *trans, ret = find_next_chunk(fs_info->chunk_root, BTRFS_FIRST_CHUNK_TREE_OBJECTID, &chunk_offset); - BUG_ON(ret); + if (ret) + return ret; alloc_profile = BTRFS_BLOCK_GROUP_METADATA | (fs_info->metadata_alloc_profile & -- 1.7.6