[PATCH] ksmbd: make __dir_empty() compatible with POSIX

[Hobin Woo <hobin.woo@samsung.com>]

Some file systems may not provide dot (.) and dot-dot (..) as they are
optional in POSIX. ksmbd can misjudge emptiness of a directory in those
file systems, since it assumes there are always at least two entries:
dot and dot-dot.
Just set the dirent_count to 2, if the first entry is not a dot.

Signed-off-by: Hobin Woo <hobin.woo@samsung.com>
---
 fs/smb/server/vfs.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/smb/server/vfs.c b/fs/smb/server/vfs.c
index 9e859ba010cf..bb836fa0aaa6 100644
--- a/fs/smb/server/vfs.c
+++ b/fs/smb/server/vfs.c
@@ -1115,6 +1115,8 @@ static bool __dir_empty(struct dir_context *ctx, const char *name, int namlen,
 	struct ksmbd_readdir_data *buf;
 
 	buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
+	if (offset == 0 && !(namlen == 1 && name[0] == '.'))
+		buf->dirent_count = 2;
 	buf->dirent_count++;
 
 	return buf->dirent_count <= 2;
-- 
2.43.0