[PATCH 6.6 075/102] ksmbd: add continuous availability share parameter

Greg Kroah-Hartman
2024-05-23T13:25:52Z

From: Namjae Jeon <linkinjeon@kernel.org>

[ Upstream commit e9d8c2f95ab8acaf3f4d4a53682a4afa3c263692 ]

If capabilities of the share is not SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY,
ksmbd should not grant a persistent handle to the client.
This patch add continuous availability share parameter to control it.

Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/smb/server/ksmbd_netlink.h | 35 ++++++++++++++++++-----------------
fs/smb/server/smb2pdu.c | 11 +++++++++--
2 files changed, 27 insertions(+), 19 deletions(-)

diff --git a/fs/smb/server/ksmbd_netlink.h b/fs/smb/server/ksmbd_netlink.h
index 686b321c5a8bb..f4e55199938d5 100644
--- a/fs/smb/server/ksmbd_netlink.h
+++ b/fs/smb/server/ksmbd_netlink.h
@@ -340,23 +340,24 @@ enum KSMBD_TREE_CONN_STATUS {
/*
* Share config flags.
*/
-#define KSMBD_SHARE_FLAG_INVALID (0)
-#define KSMBD_SHARE_FLAG_AVAILABLE BIT(0)
-#define KSMBD_SHARE_FLAG_BROWSEABLE BIT(1)
-#define KSMBD_SHARE_FLAG_WRITEABLE BIT(2)
-#define KSMBD_SHARE_FLAG_READONLY BIT(3)
-#define KSMBD_SHARE_FLAG_GUEST_OK BIT(4)
-#define KSMBD_SHARE_FLAG_GUEST_ONLY BIT(5)
-#define KSMBD_SHARE_FLAG_STORE_DOS_ATTRS BIT(6)
-#define KSMBD_SHARE_FLAG_OPLOCKS BIT(7)
-#define KSMBD_SHARE_FLAG_PIPE BIT(8)
-#define KSMBD_SHARE_FLAG_HIDE_DOT_FILES BIT(9)
-#define KSMBD_SHARE_FLAG_INHERIT_OWNER BIT(10)
-#define KSMBD_SHARE_FLAG_STREAMS BIT(11)
-#define KSMBD_SHARE_FLAG_FOLLOW_SYMLINKS BIT(12)
-#define KSMBD_SHARE_FLAG_ACL_XATTR BIT(13)
-#define KSMBD_SHARE_FLAG_UPDATE BIT(14)
-#define KSMBD_SHARE_FLAG_CROSSMNT BIT(15)
+#define KSMBD_SHARE_FLAG_INVALID (0)
+#define KSMBD_SHARE_FLAG_AVAILABLE BIT(0)
+#define KSMBD_SHARE_FLAG_BROWSEABLE BIT(1)
+#define KSMBD_SHARE_FLAG_WRITEABLE BIT(2)
+#define KSMBD_SHARE_FLAG_READONLY BIT(3)
+#define KSMBD_SHARE_FLAG_GUEST_OK BIT(4)
+#define KSMBD_SHARE_FLAG_GUEST_ONLY BIT(5)
+#define KSMBD_SHARE_FLAG_STORE_DOS_ATTRS BIT(6)
+#define KSMBD_SHARE_FLAG_OPLOCKS BIT(7)
+#define KSMBD_SHARE_FLAG_PIPE BIT(8)
+#define KSMBD_SHARE_FLAG_HIDE_DOT_FILES BIT(9)
+#define KSMBD_SHARE_FLAG_INHERIT_OWNER BIT(10)
+#define KSMBD_SHARE_FLAG_STREAMS BIT(11)
+#define KSMBD_SHARE_FLAG_FOLLOW_SYMLINKS BIT(12)
+#define KSMBD_SHARE_FLAG_ACL_XATTR BIT(13)
+#define KSMBD_SHARE_FLAG_UPDATE BIT(14)
+#define KSMBD_SHARE_FLAG_CROSSMNT BIT(15)
+#define KSMBD_SHARE_FLAG_CONTINUOUS_AVAILABILITY BIT(16)

/*
* Tree connect request flags.
diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c
index 75db0e63bcebd..1e536ae277618 100644
--- a/fs/smb/server/smb2pdu.c
+++ b/fs/smb/server/smb2pdu.c
@@ -1988,7 +1988,12 @@ int smb2_tree_connect(struct ksmbd_work *work)
write_unlock(&sess->tree_conns_lock);
rsp->StructureSize = cpu_to_le16(16);
out_err1:
- rsp->Capabilities = 0;
+ if (server_conf.flags & KSMBD_GLOBAL_FLAG_DURABLE_HANDLE &&
+ test_share_config_flag(share,
+ KSMBD_SHARE_FLAG_CONTINUOUS_AVAILABILITY))
+ rsp->Capabilities = SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY;
+ else
+ rsp->Capabilities = 0;
rsp->Reserved = 0;
/* default manual caching */
rsp->ShareFlags = SMB2_SHAREFLAG_MANUAL_CACHING;
@@ -3502,7 +3507,9 @@ int smb2_open(struct ksmbd_work *work)
memcpy(fp->client_guid, conn->ClientGUID, SMB2_CLIENT_GUID_SIZE);

if (dh_info.type == DURABLE_REQ_V2 || dh_info.type == DURABLE_REQ) {
- if (dh_info.type == DURABLE_REQ_V2 && dh_info.persistent)
+ if (dh_info.type == DURABLE_REQ_V2 && dh_info.persistent &&
+ test_share_config_flag(work->tcon->share_conf,
+ KSMBD_SHARE_FLAG_CONTINUOUS_AVAILABILITY))
fp->is_persistent = true;
else
fp->is_durable = true;
--
2.43.0