f2fs: add an ioctl() to explicitly trigger fsck later

This adds an option in ioctl(F2FS_IOC_SHUTDOWN) in order to trigger fsck by
setting a NEED_FSCK flag.

Generally, shutdown is used for the test to validate filesystem consistency, and
setting NEED_FSCK flag can be used for Android to trigger fsck.f2fs at boot time
explicitly so that we could measure the elapsed time as well as force filesystem
check.

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index aa50023..7cec897 100644 (file)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -417,6 +417,7 @@ static inline bool __has_cursum_space(struct f2fs_journal *journal,
 #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 */
+#define F2FS_GOING_DOWN_NEED_FSCK      0x4     /* going down to trigger fsck */
 
 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 /*

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index ff82350..ca9bdbb 100644 (file)
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1966,6 +1966,13 @@ static int f2fs_ioc_shutdown(struct file *filp, unsigned long arg)
                f2fs_stop_checkpoint(sbi, false);
                set_sbi_flag(sbi, SBI_IS_SHUTDOWN);
                break;
+       case F2FS_GOING_DOWN_NEED_FSCK:
+               set_sbi_flag(sbi, SBI_NEED_FSCK);
+               /* do checkpoint only */
+               ret = f2fs_sync_fs(sb, 1);
+               if (ret)
+                       goto out;
+               break;
        default:
                ret = -EINVAL;
                goto out;