[PATCH] ksmbd: notify parent directory leases on child create

[Namjae Jeon <linkinjeon@kernel.org>]

BVT_DirectoryLeasing_ReadWriteHandleCaching requires a parent directory
lease break notification when another client creates a child in the
leased directory. A child CREATE without a lease context did not notify
the parent lease holders because the notification path expected a
non-NULL lease context.

Allow the parent lease notification helper to handle a NULL child lease
context and notify matching parent leases. Invoke it after a child is
created without a lease context while preserving the existing lease-key
filtering for requests that provide one.

Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
---
 fs/smb/server/oplock.c  | 9 +++++----
 fs/smb/server/smb2pdu.c | 3 +++
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/fs/smb/server/oplock.c b/fs/smb/server/oplock.c
index 5fc2c79881d1..58af0fddf39f 100644
--- a/fs/smb/server/oplock.c
+++ b/fs/smb/server/oplock.c
@@ -1450,7 +1450,7 @@ void smb_send_parent_lease_break_noti(struct ksmbd_file *fp,
 	struct ksmbd_inode *p_ci = NULL;
 	LIST_HEAD(brk_list);
 
-	if (lctx->version != 2)
+	if (lctx && lctx->version != 2)
 		return;
 
 	p_ci = ksmbd_inode_lookup_lock(fp->filp->f_path.dentry->d_parent);
@@ -1463,9 +1463,10 @@ void smb_send_parent_lease_break_noti(struct ksmbd_file *fp,
 			continue;
 
 		if (opinfo->o_lease->state != SMB2_OPLOCK_LEVEL_NONE &&
-		    (!(lctx->flags & SMB2_LEASE_FLAG_PARENT_LEASE_KEY_SET_LE) ||
-		     !compare_guid_key(opinfo, fp->conn->ClientGUID,
-				      lctx->parent_lease_key))) {
+		    (!lctx ||
+		     (!(lctx->flags & SMB2_LEASE_FLAG_PARENT_LEASE_KEY_SET_LE) ||
+		      !compare_guid_key(opinfo, fp->conn->ClientGUID,
+			       lctx->parent_lease_key)))) {
 			if (!atomic_inc_not_zero(&opinfo->refcount))
 				continue;
 
diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c
index da461535229a..bcf4e8e1ca22 100644
--- a/fs/smb/server/smb2pdu.c
+++ b/fs/smb/server/smb2pdu.c
@@ -4663,6 +4663,9 @@ int smb2_open(struct ksmbd_work *work)
 			goto err_out1;
 		}
 	} else {
+		if (created && !lc)
+			smb_send_parent_lease_break_noti(fp, NULL);
+
 		if (req_op_level == SMB2_OPLOCK_LEVEL_LEASE && lc) {
 			if (S_ISDIR(file_inode(filp)->i_mode)) {
 				lc->req_state &= ~SMB2_LEASE_WRITE_CACHING_LE;
-- 
2.25.1