From 29cc61dc165e9ffe50d656cff6686aa2f1deadb0 Mon Sep 17 00:00:00 2001 From: Chris Mason Date: Thu, 18 Sep 2014 07:49:05 -0700 Subject: [PATCH] Revert "Btrfs: device_list_add() should not update list when mounted" This reverts commit 34e02301b4d15c7df6d870b54d3e36e5208faf1f. This commit is triggering failures to mount by subvolume id in some configurations. The main problem is how many different ways this scanning function is used, both for scanning while mounted and unmounted. A proper cleanup is too big for late rcs. For now, just revert the commit and we'll put a better fix into a later merge window. Signed-off-by: Chris Mason --- fs/btrfs/volumes.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 340a92d08e84d..2c2d6d1d8eee9 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -529,12 +529,12 @@ static noinline int device_list_add(const char *path, */ /* - * As of now don't allow update to btrfs_fs_device through - * the btrfs dev scan cli, after FS has been mounted. + * For now, we do allow update to btrfs_fs_device through the + * btrfs dev scan cli after FS has been mounted. We're still + * tracking a problem where systems fail mount by subvolume id + * when we reject replacement on a mounted FS. */ - if (fs_devices->opened) { - return -EBUSY; - } else { + if (!fs_devices->opened && found_transid < device->generation) { /* * That is if the FS is _not_ mounted and if you * are here, that means there is more than one @@ -542,8 +542,7 @@ static noinline int device_list_add(const char *path, * with larger generation number or the last-in if * generation are equal. */ - if (found_transid < device->generation) - return -EEXIST; + return -EEXIST; } name = rcu_string_strdup(path, GFP_NOFS); -- 2.39.5