LU-14541 llite: Check vmpage in releasepage

[fs/lustre-release.git] / lustre / osc / osc_page.c

diff --git a/lustre/osc/osc_page.c b/lustre/osc/osc_page.c
index fa5d86e..fd4c1f3 100644 (file)
--- a/lustre/osc/osc_page.c
+++ b/lustre/osc/osc_page.c
@@ -539,8 +539,13 @@ static inline bool lru_page_busy(struct client_obd *cli, struct cl_page *page)
        if (cli->cl_cache->ccc_unstable_check) {
                struct page *vmpage = cl_page_vmpage(page);
 
-               /* vmpage have two known users: cl_page and VM page cache */
-               if (page_count(vmpage) - page_mapcount(vmpage) > 2)
+               /* this check is racy because the vmpage is not locked, but
+                * that's OK - the code which does the actual page release
+                * checks this again before releasing
+                *
+                * vmpage have two known users: cl_page and VM page cache
+                */
+               if (vmpage_in_use(vmpage, 0))
                        return true;
        }
        return false;