f2fs: add F2FS_GOING_DOWN_METAFLUSH to test power-failure

This patch introduces F2FS_GOING_DOWN_METAFLUSH which flushes meta pages like
SSA blocks and then blocks all the writes.
This can be used by power-failure tests.

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

2 files changed, 5 insertions, 0 deletions

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index aad4720c516e..f05ae22558e2 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -250,6 +250,7 @@ static inline bool __has_cursum_space(struct f2fs_summary_block *sum, int size,
 #define F2FS_GOING_DOWN_FULLSYNC        0x0     /* going down with full sync */
 #define F2FS_GOING_DOWN_METASYNC        0x1     /* going down with metadata */
 #define F2FS_GOING_DOWN_NOSYNC          0x2     /* going down */
+#define F2FS_GOING_DOWN_METAFLUSH       0x3     /* going down with meta flush */
 
 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 /*
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index b3985a680521..6d3cfd55c3e4 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1498,6 +1498,10 @@ static int f2fs_ioc_shutdown(struct file *filp, unsigned long arg)
         case F2FS_GOING_DOWN_NOSYNC:
                 f2fs_stop_checkpoint(sbi);
                 break;
+        case F2FS_GOING_DOWN_METAFLUSH:
+                sync_meta_pages(sbi, META, LONG_MAX);
+                f2fs_stop_checkpoint(sbi);
+                break;
         default:
                 return -EINVAL;
         }