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Commit ead9ad72 authored by NeilBrown's avatar NeilBrown Committed by Trond Myklebust
Browse files

rculist: add list_for_each_entry_from_rcu() 



list_for_each_entry_from_rcu() is an RCU version of
list_for_each_entry_from().  It walks a linked list under rcu
protection, from a given start point.

It is similar to list_for_each_entry_continue_rcu() but starts *at*
the given position rather than *after* it.

Naturally, the start point must be known to be in the list.

Signed-off-by: default avatarNeilBrown <neilb@suse.com>
Signed-off-by: default avatarTrond Myklebust <trond.myklebust@hammerspace.com>
parent 3ca951b6

include/linux/rculist.h

+13 −0
Original line number Original line Diff line number Diff line
@@ -403,6 +403,19 @@ static inline void list_splice_tail_init_rcu(struct list_head *list, 
	     &pos->member != (head);	\

	     &pos->member != (head);	\

	     pos = list_entry_rcu(pos->member.next, typeof(*pos), member))

	     pos = list_entry_rcu(pos->member.next, typeof(*pos), member))





/**

 * list_for_each_entry_from_rcu - iterate over a list from current point

 * @pos:	the type * to use as a loop cursor.

 * @head:	the head for your list.

 * @member:	the name of the list_node within the struct.

 *

 * Iterate over the tail of a list starting from a given position,

 * which must have been in the list when the RCU read lock was taken.

 */

#define list_for_each_entry_from_rcu(pos, head, member)			\

	for (; &(pos)->member != (head);					\

		pos = list_entry_rcu(pos->member.next, typeof(*(pos)), member))



/**

/**

 * hlist_del_rcu - deletes entry from hash list without re-initialization

 * hlist_del_rcu - deletes entry from hash list without re-initialization

 * @n: the element to delete from the hash list.

 * @n: the element to delete from the hash list.