6db918e371
same directory pair.
If we do:
mount -t union a b
mount -t union a b
then, (1) namei tries to lock fs which has been already locked by
first union mount and (2) union_root() tries to lock locked fs. To
avoid first deadlock condition, unlock vnode if lowerrootvp is union
node, and to avoid second case, union_mount returns EDEADLK when multi
union mount is detected.
|
||
|---|---|---|
| .. | ||
| deadfs | ||
| devfs | ||
| fdesc | ||
| fifofs | ||
| kernfs | ||
| nullfs | ||
| portal | ||
| procfs | ||
| specfs | ||
| umapfs | ||
| union | ||