f2fs: keep meta pages in cp_error state

It turns out losing meta pages in shutdown period makes f2fs very unstable
so that I could see many unexpected error conditions.

Let's keep meta pages for fault injection and sudden power-off tests.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index 9f1c96c..fe92d23 100644 (file)
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -242,11 +242,8 @@ static int __f2fs_write_meta_page(struct page *page,
 
        trace_f2fs_writepage(page, META);
 
-       if (unlikely(f2fs_cp_error(sbi))) {
-               dec_page_count(sbi, F2FS_DIRTY_META);
-               unlock_page(page);
-               return 0;
-       }
+       if (unlikely(f2fs_cp_error(sbi)))
+               goto redirty_out;
        if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
                goto redirty_out;
        if (wbc->for_reclaim && page->index < GET_SUM_BLOCK(sbi, 0))
@@ -1129,6 +1126,9 @@ static void wait_on_all_pages_writeback(struct f2fs_sb_info *sbi)
                if (!get_pages(sbi, F2FS_WB_CP_DATA))
                        break;
 
+               if (unlikely(f2fs_cp_error(sbi)))
+                       break;
+
                io_schedule_timeout(5*HZ);
        }
        finish_wait(&sbi->cp_wait, &wait);
@@ -1202,8 +1202,12 @@ static void commit_checkpoint(struct f2fs_sb_info *sbi,
 
        /* writeout cp pack 2 page */
        err = __f2fs_write_meta_page(page, &wbc, FS_CP_META_IO);
-       f2fs_bug_on(sbi, err);
+       if (unlikely(err && f2fs_cp_error(sbi))) {
+               f2fs_put_page(page, 1);
+               return;
+       }
 
+       f2fs_bug_on(sbi, err);
        f2fs_put_page(page, 0);
 
        /* submit checkpoint (with barrier if NOBARRIER is not set) */
@@ -1229,7 +1233,7 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
        while (get_pages(sbi, F2FS_DIRTY_META)) {
                f2fs_sync_meta_pages(sbi, META, LONG_MAX, FS_CP_META_IO);
                if (unlikely(f2fs_cp_error(sbi)))
-                       return -EIO;
+                       break;
        }
 
        /*
@@ -1309,7 +1313,7 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
                        f2fs_sync_meta_pages(sbi, META, LONG_MAX,
                                                        FS_CP_META_IO);
                        if (unlikely(f2fs_cp_error(sbi)))
-                               return -EIO;
+                               break;
                }
        }
 
@@ -1350,9 +1354,6 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
        /* wait for previous submitted meta pages writeback */
        wait_on_all_pages_writeback(sbi);
 
-       if (unlikely(f2fs_cp_error(sbi)))
-               return -EIO;
-
        /* flush all device cache */
        err = f2fs_flush_device_cache(sbi);
        if (err)
@@ -1364,9 +1365,6 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
 
        f2fs_release_ino_entry(sbi, false);
 
-       if (unlikely(f2fs_cp_error(sbi)))
-               return -EIO;
-
        clear_sbi_flag(sbi, SBI_IS_DIRTY);
        clear_sbi_flag(sbi, SBI_NEED_CP);
        __set_cp_next_pack(sbi);
@@ -1381,7 +1379,7 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
 
        f2fs_bug_on(sbi, get_pages(sbi, F2FS_DIRTY_DENTS));
 
-       return 0;
+       return unlikely(f2fs_cp_error(sbi)) ? -EIO : 0;
 }
 
 /*