rculist: add list_for_each_entry_from_rcu() (ead9ad72) · Commits · 戴 / test

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:

NeilBrown <neilb@suse.com> Signed-off-by:

Trond Myklebust <trond.myklebust@hammerspace.com>

include/linux/rculist.h

+13 −0

Original line number	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 = 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
		* @n: the element to delete from the hash list.

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