adfs: check for a directory write error with buffer_write_io_error()

adfs_dir_sync() spots a failed write by testing BH_Req together with
!BH_Uptodate.  That relies on the write completion handler clearing
BH_Uptodate on error, which this series removes: a buffer whose write
failed still holds the data the filesystem asked to be written, so
declaring it not up to date is wrong and makes callers re-read it.

BH_Write_EIO says exactly what this code wants to know, and it implies
BH_Req, so the pair collapses into one test.

No behaviour change today - a failed write sets BH_Write_EIO and clears
BH_Uptodate together.  It stops being a no-op at the end of the series,
where the new test is the one that still works.

Acked-by: Weidong Zhu <weizhu@fiu.edu>
Signed-off-by: Chao Shi <coshi036@gmail.com>
Link: https://patch.msgid.link/05cf8ad911ad7a6eb68f42e38f1eea39c38e246b.1785951556.git.coshi036@gmail.com
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

0 files changed, 0 insertions, 0 deletions