unlock_cluster_or_swap_info

Name:unlock_cluster_or_swap_info

Proto:static inline void unlock_cluster_or_swap_info(struct swap_info_struct *si, struct swap_cluster_info *ci)

Type:void

Parameter:

Type	Parameter	Name
struct swap_info_struct *	si
struct swap_cluster_info *	ci

378

If ci Then unlock_cluster(ci)

380

Else spin_unlock( & protect map scan related fields like* swap_map, lowest_bit, highest_bit,* inuse_pages, cluster_next,* cluster_nr, lowest_alloc,* highest_alloc, free/discard cluster* list. other fields are only changed* at swapon/swapoff, so are protected* by swap_lock)

**Caller**
Name	Describe
__swap_entry_free
put_swap_page	Called after dropping swapcache to decrease refcnt to swap entries.
page_swapcount	How many references to page are currently swapped out?* This does not give an exact answer when swap count is continued,* but does include the high COUNT_CONTINUED flag to allow for that.
swap_swapcount
swp_swapcount	How many references to @entry are currently swapped out?* This considers COUNT_CONTINUED so it returns exact answer.
swap_page_trans_huge_swapped
__swap_duplicate	Verify that a swap entry is valid and increment its swap map count.* Returns error code in following case.* - success -> 0* - swp_entry is invalid -> EINVAL* - swp_entry is migration entry -> EINVAL

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