On Wed, Apr 18, 2018 at 04:47:02PM +1000, NeilBrown wrote: > rhashtable_walk_prev() returns the object returned by > the previous rhashtable_walk_next(), providing it is still in the > table (or was during this grace period). > This works even if rhashtable_walk_stop() and rhashtable_talk_start() > have been called since the last rhashtable_walk_next(). > > If there have been no calls to rhashtable_walk_next(), or if the > object is gone from the table, then NULL is returned. > > This can usefully be used in a seq_file ->start() function. > If the pos is the same as was returned by the last ->next() call, > then rhashtable_walk_prev() can be used to re-establish the > current location in the table. If it returns NULL, then > rhashtable_walk_next() should be used. > > Signed-off-by: NeilBrown <ne...@suse.com>
Can you explain the need for this function and its difference from the existing rhashtable_walk_peek? Thanks, -- Email: Herbert Xu <herb...@gondor.apana.org.au> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
