[PATCH 0/2] fuse: prepare for VFS locking changes.

[NeilBrown]

I am working on changes to directory locking.  The medium term goal is
to lift d_alloc_parallel() locking above i_rwsem, so d_alloc_paralle()
can be run unlocked, and consequently cannot be called when ->i_rwsem is
held.

The requires:
 1/ the d_alloc_parallel() not be called while i_rwsem is held.  fuse
    does this when priming the dcache from readdir results.  A new
    interface d_alloc_trylock() is now available and can be used
    instead.

 2/ a dentry must not be d_drop()ed while an operation is ongoing, as an
    unlocked d_alloc_parallel() would then be able to create a new
    dentry with the same name. Now that d_splice_alias() is able to
    splice a hashed alias, create_new_entry() doesn't need to d_drop()
    any more

The patches depend on patches recently added to the vfs tree.  I would
prefer these land in that tree too with an Acked-by or similar from fuse
maintainers.

Thanks,
NeilBrown


 [PATCH 1/2] fuse: don't d_drop() before d_splice_alias()
 [PATCH 2/2] fuse: Use d_alloc_trylock() in fuse_direntplus_link()