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Diffstat (limited to 'mm/swapfile.c')
-rw-r--r--mm/swapfile.c35
1 files changed, 20 insertions, 15 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 178130880b90..b86b2aca3fb9 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -335,7 +335,7 @@ static void cluster_list_add_tail(struct swap_cluster_list *list,
ci_tail = ci + tail;
spin_lock_nested(&ci_tail->lock, SINGLE_DEPTH_NESTING);
cluster_set_next(ci_tail, idx);
- unlock_cluster(ci_tail);
+ spin_unlock(&ci_tail->lock);
cluster_set_next_flag(&list->tail, idx, 0);
}
}
@@ -672,6 +672,9 @@ checks:
else
goto done;
}
+ si->swap_map[offset] = usage;
+ inc_cluster_info_page(si, si->cluster_info, offset);
+ unlock_cluster(ci);
if (offset == si->lowest_bit)
si->lowest_bit++;
@@ -685,9 +688,6 @@ checks:
plist_del(&si->avail_list, &swap_avail_head);
spin_unlock(&swap_avail_lock);
}
- si->swap_map[offset] = usage;
- inc_cluster_info_page(si, si->cluster_info, offset);
- unlock_cluster(ci);
si->cluster_next = offset + 1;
slots[n_ret++] = swp_entry(si->type, offset);
@@ -1079,8 +1079,6 @@ void swapcache_free_entries(swp_entry_t *entries, int n)
p = swap_info_get_cont(entries[i], prev);
if (p)
swap_entry_free(p, entries[i]);
- else
- break;
prev = p;
}
if (p)
@@ -1111,6 +1109,18 @@ int page_swapcount(struct page *page)
return count;
}
+static int swap_swapcount(struct swap_info_struct *si, swp_entry_t entry)
+{
+ int count = 0;
+ pgoff_t offset = swp_offset(entry);
+ struct swap_cluster_info *ci;
+
+ ci = lock_cluster_or_swap_info(si, offset);
+ count = swap_count(si->swap_map[offset]);
+ unlock_cluster_or_swap_info(si, ci);
+ return count;
+}
+
/*
* How many references to @entry are currently swapped out?
* This does not give an exact answer when swap count is continued,
@@ -1119,17 +1129,11 @@ int page_swapcount(struct page *page)
int __swp_swapcount(swp_entry_t entry)
{
int count = 0;
- pgoff_t offset;
struct swap_info_struct *si;
- struct swap_cluster_info *ci;
si = __swap_info_get(entry);
- if (si) {
- offset = swp_offset(entry);
- ci = lock_cluster_or_swap_info(si, offset);
- count = swap_count(si->swap_map[offset]);
- unlock_cluster_or_swap_info(si, ci);
- }
+ if (si)
+ count = swap_swapcount(si, entry);
return count;
}
@@ -1291,7 +1295,8 @@ int free_swap_and_cache(swp_entry_t entry)
* Also recheck PageSwapCache now page is locked (above).
*/
if (PageSwapCache(page) && !PageWriteback(page) &&
- (!page_mapped(page) || mem_cgroup_swap_full(page))) {
+ (!page_mapped(page) || mem_cgroup_swap_full(page)) &&
+ !swap_swapcount(p, entry)) {
delete_from_swap_cache(page);
SetPageDirty(page);
}