linux-kernel - [PATCH 3.12 028/124] btrfs: cleanup orphans while looking up default subvolume

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Message-Id: <4d1b0c33bf80b56408fe9a3f444ec17904d64934.1438076484.git.jslaby@suse.cz>
Date:	Tue, 28 Jul 2015 11:42:42 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Jeff Mahoney <jeffm@...e.com>,
	Chris Mason <clm@...com>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 028/124] btrfs: cleanup orphans while looking up default subvolume

From: Jeff Mahoney <jeffm@...e.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 727b9784b6085c99c2f836bf4fcc2848dc9cf904 upstream.

Orphans in the fs tree are cleaned up via open_ctree and subvolume
orphans are cleaned via btrfs_lookup_dentry -- except when a default
subvolume is in use.  The name for the default subvolume uses a manual
lookup that doesn't trigger orphan cleanup and needs to trigger it
manually as well. This doesn't apply to the remount case since the
subvolumes are cleaned up by walking the root radix tree.

Signed-off-by: Jeff Mahoney <jeffm@...e.com>
Reviewed-by: David Sterba <dsterba@...e.cz>
Signed-off-by: Chris Mason <clm@...com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 fs/btrfs/super.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index e913328d0f2a..24681de965db 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -834,6 +834,15 @@ find_root:
 	if (IS_ERR(new_root))
 		return ERR_CAST(new_root);
 
+	if (!(sb->s_flags & MS_RDONLY)) {
+		int ret;
+		down_read(&fs_info->cleanup_work_sem);
+		ret = btrfs_orphan_cleanup(new_root);
+		up_read(&fs_info->cleanup_work_sem);
+		if (ret)
+			return ERR_PTR(ret);
+	}
+
 	dir_id = btrfs_root_dirid(&new_root->root_item);
 setup_root:
 	location.objectid = dir_id;
-- 
2.4.6

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