as before, we move the src entry from src_parent to dst_parent. but instead of unlinking the destination entry if it exists, we recycle it as a negative entry where src used to be. if the destination entry doesn't exist, we create a new one for this negative entry
if the dst_parent entry is invalidated by the change_info, we just leave the original src entry in place and make it negative
Signed-off-by: Casey Bodley <cbodley@umich.edu>
negative lookup entries don't have attributes, so we won't invalidate them based on 'change'. name_cache_entry_changed() returns false if entry->attributes == NULL
Signed-off-by: Casey Bodley <cbodley@umich.edu>
instead of calling name_cache_entry_unlink(), nfs41_name_cache_remove() calls name_cache_entry_update() with NULL for fh and info to make it a negative entry, then name_cache_unlink_children_recursive() to remove any children
Signed-off-by: Casey Bodley <cbodley@umich.edu>
marked nfs41_name_cache_insert() parameters fh and info as OPTIONAL; passing NULL designates a negative lookup entry
name_cache_entry_create() no longer calls attr_cache_find_or_create(), and doesn't need the 'fileid' argument
name_cache_entry_update() also makes fh and info OPTIONAL, and handles the cases where we switch from a negative <-> positive entry, calling attr_cache_find_or_create() or attr_cache_entry_deref() as appropriate
removed unused function name_cache_find_or_create(); everything uses name_cache_entry_find_or_create() instead, so renamed that to name_cache_find_or_create()
Signed-off-by: Casey Bodley <cbodley@umich.edu>
added function entry_invis() in addition to entry_has_expired(). entry_invis() returns true if entry_has_expired() or for negative entries. the is_negative flag is set for negative entries (defined as having entry->attributes == NULL), and returned by nfs41_name_cache_lookup(). when nfs41_lookup() sees this flag set, it returns the status without attempting to do any more lookups
Signed-off-by: Casey Bodley <cbodley@umich.edu>
