[PATCH 6.6.y v3 1/4] ksmbd: avoid reclaiming expired durable opens by the client

[Alva Lan <alvalan9@foxmail.com>]

From: Namjae Jeon <linkinjeon@kernel.org>

[ Upstream commit 520da3c488c5bb177871634e713eb8a106082e6b ]

The expired durable opens should not be reclaimed by client.
This patch add ->durable_scavenger_timeout to fp and check it in
ksmbd_lookup_durable_fd().

Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Alva Lan <alvalan9@foxmail.com>
---
 fs/smb/server/vfs_cache.c | 9 ++++++++-
 fs/smb/server/vfs_cache.h | 1 +
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/fs/smb/server/vfs_cache.c b/fs/smb/server/vfs_cache.c
index eacc6ef41db0..729758697c12 100644
--- a/fs/smb/server/vfs_cache.c
+++ b/fs/smb/server/vfs_cache.c
@@ -515,7 +515,10 @@ struct ksmbd_file *ksmbd_lookup_durable_fd(unsigned long long id)
 	struct ksmbd_file *fp;
 
 	fp = __ksmbd_lookup_fd(&global_ft, id);
-	if (fp && fp->conn) {
+	if (fp && (fp->conn ||
+		   (fp->durable_scavenger_timeout &&
+		    (fp->durable_scavenger_timeout <
+		     jiffies_to_msecs(jiffies))))) {
 		ksmbd_put_durable_fd(fp);
 		fp = NULL;
 	}
@@ -784,6 +787,10 @@ static bool session_fd_check(struct ksmbd_tree_connect *tcon,
 	fp->tcon = NULL;
 	fp->volatile_id = KSMBD_NO_FID;
 
+	if (fp->durable_timeout)
+		fp->durable_scavenger_timeout =
+			jiffies_to_msecs(jiffies) + fp->durable_timeout;
+
 	return true;
 }
 
diff --git a/fs/smb/server/vfs_cache.h b/fs/smb/server/vfs_cache.h
index 5a225e7055f1..f2ab1514e81a 100644
--- a/fs/smb/server/vfs_cache.h
+++ b/fs/smb/server/vfs_cache.h
@@ -101,6 +101,7 @@ struct ksmbd_file {
 	struct list_head		lock_list;
 
 	int				durable_timeout;
+	int				durable_scavenger_timeout;
 
 	/* if ls is happening on directory, below is valid*/
 	struct ksmbd_readdir_data	readdir_data;
-- 
2.43.0