Revert "fs/9p: remove redundant pointer v9ses"

This reverts commit 10211b4.

This is a requirement to revert commit 724a084 ("fs/9p: simplify
iget to remove unnecessary paths"), see that revert for details.

Fixes: 724a084 ("fs/9p: simplify iget to remove unnecessary paths")
Reported-by: Will Deacon <will@kernel.org>
Link: https://lkml.kernel.org/r/20240923100508.GA32066@willie-the-truck
Cc: stable@vger.kernel.org # v6.9+
Message-ID: <20241024-revert_iget-v1-2-4cac63d25f72@codewreck.org>
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>

fs/9p/vfs_inode_dotl.c

@@ -297,6 +297,7 @@ static int v9fs_vfs_mkdir_dotl(struct mnt_idmap *idmap,
 			       umode_t omode)
 {
 	int err;
+	struct v9fs_session_info *v9ses;
 	struct p9_fid *fid = NULL, *dfid = NULL;
 	kgid_t gid;
 	const unsigned char *name;
@@ -306,6 +307,7 @@ static int v9fs_vfs_mkdir_dotl(struct mnt_idmap *idmap,
 	struct posix_acl *dacl = NULL, *pacl = NULL;
 
 	p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
+	v9ses = v9fs_inode2v9ses(dir);
 
 	omode |= S_IFDIR;
 	if (dir->i_mode & S_ISGID)
@@ -737,6 +739,7 @@ v9fs_vfs_mknod_dotl(struct mnt_idmap *idmap, struct inode *dir,
 	kgid_t gid;
 	const unsigned char *name;
 	umode_t mode;
+	struct v9fs_session_info *v9ses;
 	struct p9_fid *fid = NULL, *dfid = NULL;
 	struct inode *inode;
 	struct p9_qid qid;
@@ -746,6 +749,7 @@ v9fs_vfs_mknod_dotl(struct mnt_idmap *idmap, struct inode *dir,
 		 dir->i_ino, dentry, omode,
 		 MAJOR(rdev), MINOR(rdev));
 
+	v9ses = v9fs_inode2v9ses(dir);
 	dfid = v9fs_parent_fid(dentry);
 	if (IS_ERR(dfid)) {
 		err = PTR_ERR(dfid);