[PATCH 3/9] smb/client: prepare notify ioctl per-open state

[ChenXiaoSong <chenxiaosong@chenxiaosong.com>]

From: ChenXiaoSong <chenxiaosong@kylinos.cn>

This patch was split out to make it easier to review.

Ensure smb3_notify() has directory private data before requests.
This gives later changes a per-open state container while preserving
the existing per-notify SMB2_open/SMB2_close behavior.

Signed-off-by: ChenXiaoSong <chenxiaosong@kylinos.cn>
---
 fs/smb/client/smb2ops.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c
index 06e9322a762a..349126deb22e 100644
--- a/fs/smb/client/smb2ops.c
+++ b/fs/smb/client/smb2ops.c
@@ -2376,9 +2376,11 @@ smb3_notify(const unsigned int xid, struct file *pfile,
 	struct dentry *dentry = pfile->f_path.dentry;
 	struct inode *inode = file_inode(pfile);
 	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+	struct cifsFileInfo *cfile;
 	struct cifs_open_parms oparms;
 	struct cifs_fid fid;
 	struct cifs_tcon *tcon;
+	struct tcon_link *tlink;
 	const unsigned char *path;
 	char *returned_ioctl_info = NULL;
 	void *page = alloc_dentry_path();
@@ -2412,6 +2414,20 @@ smb3_notify(const unsigned int xid, struct file *pfile,
 		notify.data_len = 0;
 	}
 
+	if (!pfile->private_data) {
+		tlink = cifs_sb_tlink(cifs_sb);
+		if (IS_ERR(tlink)) {
+			rc = PTR_ERR(tlink);
+			goto notify_exit;
+		}
+		cfile = cifs_new_dir_fileinfo(pfile, tlink);
+		cifs_put_tlink(tlink);
+		if (!cfile) {
+			rc = -ENOMEM;
+			goto notify_exit;
+		}
+	}
+
 	tcon = cifs_sb_master_tcon(cifs_sb);
 	oparms = (struct cifs_open_parms) {
 		.tcon = tcon,
-- 
2.54.0