ovl: don't remove non-empty opaque directory

When removing an opaque directory we can't just call rmdir() to check for
emptiness, because the directory will need to be replaced with a whiteout.
The replacement is done with RENAME_EXCHANGE, which doesn't check
emptiness.

Solution is just to check emptiness by reading the directory.  In the
future we could add a new rename flag to check for emptiness even for
RENAME_EXCHANGE to optimize this case.

Reported-by: Vincent Batts <[email protected]>
Signed-off-by: Miklos Szeredi <[email protected]>
Tested-by: Jordi Pujol Palomer <[email protected]>
Fixes: 263b4a0fee43 ("ovl: dont replace opaque dir")
Cc: <[email protected]> # v4.0+

0 files changed, 0 insertions, 0 deletions