bpf: convert to new timestamp accessors

Convert to using the new inode timestamp accessor functions.
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://lore.kernel.org/r/20231004185347.80880-79-jlayton@kernel.orgSigned-off-by: Christian Brauner <brauner@kernel.org>

kernel/bpf/inode.c

@@ -118,8 +118,7 @@ static struct inode *bpf_get_inode(struct super_block *sb,
 		return ERR_PTR(-ENOSPC);
 
 	inode->i_ino = get_next_ino();
-	inode->i_atime = inode_set_ctime_current(inode);
-	inode->i_mtime = inode->i_atime;
+	simple_inode_init_ts(inode);
 
 	inode_init_owner(&nop_mnt_idmap, inode, dir, mode);
 
@@ -147,7 +146,7 @@ static void bpf_dentry_finalize(struct dentry *dentry, struct inode *inode,
 	d_instantiate(dentry, inode);
 	dget(dentry);
 
-	dir->i_mtime = inode_set_ctime_current(dir);
+	inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
 }
 
 static int bpf_mkdir(struct mnt_idmap *idmap, struct inode *dir,