93fe61afde
The underlying VOP_MKDIR() implementation may temporarily drop the parent directory vnode's lock. If the vnode is reclaimed during that window, the unionfs vnode will effectively become unlocked because the its v_vnlock field will be reset. To uphold the locking requirements of VOP_MKDIR() and to avoid triggering various VFS assertions, explicitly re-lock the unionfs vnode before returning in this case. Note that there are almost certainly other cases in which we'll similarly need to handle vnode relocking by the underlying FS; this is the only one that's caused problems in stress testing so far. A more general solution, such as that employed for nullfs in null_bypass(), will likely need to be implemented. Tested by: pho Reviewed by: kib, markj Differential Revision: https://reviews.freebsd.org/D39272 |
||
|---|---|---|
| .. | ||
| union_subr.c | ||
| union_vfsops.c | ||
| union_vnops.c | ||
| union.h | ||