On Thu, Dec 21, 2017 at 09:45:40AM +1100, NeilBrown wrote: > -c/ Helper routines to allocate anonymous dentries, and to help attach > + prefix. If the refcount on a dentry with this flag set > + becomes zero, the dentry is immediately discarded, rather than being > + kept in the dcache. If a dentry that is not already in the dcache > + is repeatedly accessed by filehandle (as NFSD might do), an new dentry > + will be a allocated for each access, and discarded at the end of s/a // > + the access. As there is no parent, children, or name in the dentry > + is it unlikely that there will be any useful information to lose, > + and allocating a new dentry should normally be fast. How about: As the dentry is completely unattached, there is little information to lose, and allocating a new dentry is normally fast.
