mm/shmem: do not wait for lock_page() in shmem_unused_huge_shrink()

BugLink: http://bugs.launchpad.net/bugs/1759655
commit b3cd54b257ad95d344d121dc563d943ca39b0921 upstream.

shmem_unused_huge_shrink() gets called from reclaim path.  Waiting for
page lock may lead to deadlock there.

There was a bug report that may be attributed to this:

  http://lkml.kernel.org/r/alpine.LRH.2.11.1801242349220.30642@mail.ewheeler.net

Replace lock_page() with trylock_page() and skip the page if we failed
to lock it.  We will get to the page on the next scan.

We can test for the PageTransHuge() outside the page lock as we only
need protection against splitting the page under us.  Holding pin oni
the page is enough for this.

Link: http://lkml.kernel.org/r/20180316210830.43738-1-kirill.shutemov@linux.intel.com
Fixes: 779750d20b93 ("shmem: split huge pages beyond i_size under memory pressure")
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reported-by: Eric Wheeler <linux-mm@lists.ewheeler.net>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Hugh Dickins <hughd@google.com>
Cc: <stable@vger.kernel.org>	[4.8+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>

diff --git a/mm/shmem.c b/mm/shmem.c
index f6695c1110868f98bf6ca755391a0f395d4de25f..800482fe6ed6b824cfca28e03908bec4eb6e94e0 100644 (file)
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -497,36 +497,45 @@ next:
                info = list_entry(pos, struct shmem_inode_info, shrinklist);
                inode = &info->vfs_inode;
 
-               if (nr_to_split && split >= nr_to_split) {
-                       iput(inode);
-                       continue;
-               }
+               if (nr_to_split && split >= nr_to_split)
+                       goto leave;
 
-               page = find_lock_page(inode->i_mapping,
+               page = find_get_page(inode->i_mapping,
                                (inode->i_size & HPAGE_PMD_MASK) >> PAGE_SHIFT);
                if (!page)
                        goto drop;
 
+               /* No huge page at the end of the file: nothing to split */
                if (!PageTransHuge(page)) {
-                       unlock_page(page);
                        put_page(page);
                        goto drop;
                }
 
+               /*
+                * Leave the inode on the list if we failed to lock
+                * the page at this time.
+                *
+                * Waiting for the lock may lead to deadlock in the
+                * reclaim path.
+                */
+               if (!trylock_page(page)) {
+                       put_page(page);
+                       goto leave;
+               }
+
                ret = split_huge_page(page);
                unlock_page(page);
                put_page(page);
 
-               if (ret) {
-                       /* split failed: leave it on the list */
-                       iput(inode);
-                       continue;
-               }
+               /* If split failed leave the inode on the list */
+               if (ret)
+                       goto leave;
 
                split++;
 drop:
                list_del_init(&info->shrinklist);
                removed++;
+leave:
                iput(inode);
        }