f2fs: fix to release count of meta page in ->invalidatepage

We will encounter deadloop in below scenario:

1. increase page count for F2FS_DIRTY_META type in following path:
->recover_fsync_data
  ->recover_data
    ->do_recover_data
      ->recover_data_page
        ->change_curseg
          ->write_sum_page
            ->set_page_dirty
2. fail in recover_data()
3. invalidate meta pages in truncate_inode_pages_final without decreasing page
   count.
4. deadloop when sync_meta_pages as page count will always be non-zero.

message:
NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s!

 [<c1129a37>] pagevec_lookup_tag+0x27/0x30
 [<f0e774c7>] sync_meta_pages+0x87/0x160 [f2fs]
 [<f0e86dd9>] recover_fsync_data+0xeb9/0xf10 [f2fs]
 [<f0e75398>] f2fs_fill_super+0x888/0x980 [f2fs]
 [<c11733ca>] mount_bdev+0x16a/0x1a0
 [<f0e7180f>] f2fs_mount+0x1f/0x30 [f2fs]
 [<c1173da6>] mount_fs+0x36/0x170
 [<c118b6f5>] vfs_kern_mount+0x55/0xe0
 [<c118d63f>] do_mount+0x1df/0x9f0
 [<c118e110>] SyS_mount+0x70/0xb0
 [<c15a0c48>] sysenter_do_call+0x12/0x12

To avoid page count leak, let's add ->invalidatepage and ->releasepage in
f2fs_meta_aops as f2fs_node_aops to release meta page count correctly.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index 231d8c9fea0a..79f82819086f 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -302,16 +302,35 @@ static int f2fs_set_meta_page_dirty(struct page *page)
         if (!PageDirty(page)) {
                 __set_page_dirty_nobuffers(page);
                 inc_page_count(F2FS_P_SB(page), F2FS_DIRTY_META);
+                SetPagePrivate(page);
                 f2fs_trace_pid(page);
                 return 1;
         }
         return 0;
 }
 
+static void f2fs_invalidate_meta_page(struct page *page, unsigned int offset,
+                                      unsigned int length)
+{
+        struct inode *inode = page->mapping->host;
+
+        if (PageDirty(page))
+                dec_page_count(F2FS_I_SB(inode), F2FS_DIRTY_META);
+        ClearPagePrivate(page);
+}
+
+static int f2fs_release_meta_page(struct page *page, gfp_t wait)
+{
+        ClearPagePrivate(page);
+        return 1;
+}
+
 const struct address_space_operations f2fs_meta_aops = {
         .writepage      = f2fs_write_meta_page,
         .writepages     = f2fs_write_meta_pages,
         .set_page_dirty = f2fs_set_meta_page_dirty,
+        .invalidatepage = f2fs_invalidate_meta_page,
+        .releasepage    = f2fs_release_meta_page,
 };
 
 static void __add_ino_entry(struct f2fs_sb_info *sbi, nid_t ino, int type)