Btrfs devel - Jan 2013 - [PATCH] Btrfs: fix how we discard outstanding ordered extents on abort

When we abort we''ve been just free''ing up all the ordered
extents and
hoping for the best.  This results in lots of warnings from various places,
warnings from btrfs_destroy_inode() because it''s ENOSPC accounting
isn''t
fixed.  It will also screw up lots of pages who have been set private but
never get cleared because the ordered extents are never allowed to be
submitted.  This patch fixes those warnings.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
---
 fs/btrfs/disk-io.c |   32 +++++++-------------------------
 1 files changed, 7 insertions(+), 25 deletions(-)

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 42f83aa..63adf80 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -3565,35 +3565,17 @@ static void btrfs_destroy_ordered_operations(struct
btrfs_root *root)
 
 static void btrfs_destroy_ordered_extents(struct btrfs_root *root)
 {
-	struct list_head splice;
 	struct btrfs_ordered_extent *ordered;
 	struct inode *inode;
 
-	INIT_LIST_HEAD(&splice);
-
 	spin_lock(&root->fs_info->ordered_extent_lock);
-
-	list_splice_init(&root->fs_info->ordered_extents, &splice);
-	while (!list_empty(&splice)) {
-		ordered = list_entry(splice.next, struct btrfs_ordered_extent,
-				     root_extent_list);
-
-		list_del_init(&ordered->root_extent_list);
-		atomic_inc(&ordered->refs);
-
-		/* the inode may be getting freed (in sys_unlink path). */
-		inode = igrab(ordered->inode);
-
-		spin_unlock(&root->fs_info->ordered_extent_lock);
-		if (inode)
-			iput(inode);
-
-		atomic_set(&ordered->refs, 1);
-		btrfs_put_ordered_extent(ordered);
-
-		spin_lock(&root->fs_info->ordered_extent_lock);
-	}
-
+	/*
+	 * This will just short circuit the ordered completion stuff which will
+	 * make sure the ordered extent gets properly cleaned up.
+	 */
+	list_for_each_entry(ordered, &root->fs_info->ordered_extents,
+			    root_extent_list)
+		set_bit(BTRFS_ORDERED_IOERR, &ordered->flags);
 	spin_unlock(&root->fs_info->ordered_extent_lock);
 }
 
-- 
1.7.7.6

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> -	struct list_head splice;
>  	struct btrfs_ordered_extent *ordered;
>  	struct inode *inode;
Remove this too?
> +	/*
> +	 * This will just short circuit the ordered completion stuff which will
> +	 * make sure the ordered extent gets properly cleaned up.
> +	 */
> +	list_for_each_entry(ordered, &root->fs_info->ordered_extents,
> +			    root_extent_list)
> +		set_bit(BTRFS_ORDERED_IOERR, &ordered->flags);
>  	spin_unlock(&root->fs_info->ordered_extent_lock);
>  }
fs/btrfs/disk-io.c: In function ‘btrfs_destroy_ordered_extents’:
fs/btrfs/disk-io.c:3548:16: warning: unused variable ‘inode’ [-Wunused-variable]

- z
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On Thu, Jan 31, 2013 at 12:58:08PM -0700, Zach Brown
wrote:
> > -	struct list_head splice;
> >  	struct btrfs_ordered_extent *ordered;
> 
> >  	struct inode *inode;
> 
> Remove this too?
> 
> > +	/*
> > +	 * This will just short circuit the ordered completion stuff which
will
> > +	 * make sure the ordered extent gets properly cleaned up.
> > +	 */
> > +	list_for_each_entry(ordered,
&root->fs_info->ordered_extents,
> > +			    root_extent_list)
> > +		set_bit(BTRFS_ORDERED_IOERR, &ordered->flags);
> >  	spin_unlock(&root->fs_info->ordered_extent_lock);
> >  }
> 
> fs/btrfs/disk-io.c: In function ‘btrfs_destroy_ordered_extents’:
> fs/btrfs/disk-io.c:3548:16: warning: unused variable ‘inode’
[-Wunused-variable]
> 
Sigh I sent the wrong thing out, the one committed to my tree is right.  Thanks,

Josef
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