logfs: handle powerfail on NAND flash

The write buffer may not have been written and may no longer be written
due to an interrupted write in the affected page.

Signed-off-by: Joern Engel <joern@logfs.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/fs/logfs/dev_bdev.c b/fs/logfs/dev_bdev.c
index 243c00071f76..9bd2ce2a3040 100644
--- a/fs/logfs/dev_bdev.c
+++ b/fs/logfs/dev_bdev.c
@@ -303,6 +303,11 @@ static void bdev_put_device(struct super_block *sb)
         close_bdev_exclusive(logfs_super(sb)->s_bdev, FMODE_READ|FMODE_WRITE);
 }
 
+static int bdev_can_write_buf(struct super_block *sb, u64 ofs)
+{
+        return 0;
+}
+
 static const struct logfs_device_ops bd_devops = {
         .find_first_sb  = bdev_find_first_sb,
         .find_last_sb   = bdev_find_last_sb,
@@ -310,6 +315,7 @@ static const struct logfs_device_ops bd_devops = {
         .readpage       = bdev_readpage,
         .writeseg       = bdev_writeseg,
         .erase          = bdev_erase,
+        .can_write_buf  = bdev_can_write_buf,
         .sync           = bdev_sync,
         .put_device     = bdev_put_device,
 };