f2fs: fix to drop all dirty meta/node pages during umount()

For cp error case, there will be dirty meta/node pages remained after
f2fs_write_checkpoint() in f2fs_put_super(), drop them explicitly, and
do sanity check on reference count of dirty pages and inflight IOs.

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

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index ee390c3..2936bc8 100644 (file)
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1571,6 +1571,7 @@ static void f2fs_put_super(struct super_block *sb)
 {
        struct f2fs_sb_info *sbi = F2FS_SB(sb);
        int i;
+       int err = 0;
        bool done;
 
        /* unregister procfs/sysfs entries in advance to avoid race case */
@@ -1597,7 +1598,7 @@ static void f2fs_put_super(struct super_block *sb)
                struct cp_control cpc = {
                        .reason = CP_UMOUNT,
                };
-               f2fs_write_checkpoint(sbi, &cpc);
+               err = f2fs_write_checkpoint(sbi, &cpc);
        }
 
        /* be sure to wait for any on-going discard commands */
@@ -1606,7 +1607,7 @@ static void f2fs_put_super(struct super_block *sb)
                struct cp_control cpc = {
                        .reason = CP_UMOUNT | CP_TRIMMED,
                };
-               f2fs_write_checkpoint(sbi, &cpc);
+               err = f2fs_write_checkpoint(sbi, &cpc);
        }
 
        /*
@@ -1623,6 +1624,19 @@ static void f2fs_put_super(struct super_block *sb)
 
        f2fs_wait_on_all_pages(sbi, F2FS_WB_CP_DATA);
 
+       if (err) {
+               truncate_inode_pages_final(NODE_MAPPING(sbi));
+               truncate_inode_pages_final(META_MAPPING(sbi));
+       }
+
+       for (i = 0; i < NR_COUNT_TYPE; i++) {
+               if (!get_pages(sbi, i))
+                       continue;
+               f2fs_err(sbi, "detect filesystem reference count leak during "
+                       "umount, type: %d, count: %lld", i, get_pages(sbi, i));
+               f2fs_bug_on(sbi, 1);
+       }
+
        f2fs_bug_on(sbi, sbi->fsync_node_num);
 
        f2fs_destroy_compress_inode(sbi);