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authorD. Andrei Măceș <dmaces@nd.edu>2015-09-30 15:18:37 -0400
committerSimon Shields <keepcalm444@gmail.com>2016-06-12 21:20:18 +1000
commit4698b1b9e737365e206f1ef55a864d8e205fe8f3 (patch)
treef842b37023d7cfb21ea9b0f269ff2cbae5d40591 /mm
parenta6ce37fb73dce407da9d7d1d03408602be84177c (diff)
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mm: Need page_swap_info() helper method from upstream
Stolen from commit f981c5950fa85916ba49bea5d9a7a5078f47e569: "mm: methods for teaching filesystems about PG_swapcache pages" Change-Id: I6673913f9c825d3a6de88a652e99bcaf04eb1dd6
Diffstat (limited to 'mm')
-rw-r--r--mm/swapfile.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 7197864..4add436 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -2321,6 +2321,13 @@ int swapcache_prepare(swp_entry_t entry)
return __swap_duplicate(entry, SWAP_HAS_CACHE);
}
+struct swap_info_struct *page_swap_info(struct page *page)
+{
+ swp_entry_t swap = { .val = page_private(page) };
+ BUG_ON(!PageSwapCache(page));
+ return swap_info[swp_type(swap)];
+}
+
/*
* swap_lock prevents swap_map being freed. Don't grab an extra
* reference on the swaphandle, it doesn't matter if it becomes unused.