add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/proc/self.c
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@@ -12,16 +12,9 @@
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 				      struct inode *inode,
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 				      struct delayed_call *done)
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 {
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-	struct pid_namespace *ns = proc_pid_ns(inode);
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+	struct pid_namespace *ns = proc_pid_ns(inode->i_sb);
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 	pid_t tgid = task_tgid_nr_ns(current, ns);
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 	char *name;
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-
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-	/*
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-	 * Not currently supported. Once we can inherit all of struct pid,
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-	 * we can allow this.
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-	 */
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-	if (current->flags & PF_KTHREAD)
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-		return ERR_PTR(-EOPNOTSUPP);
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 	if (!tgid)
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 		return ERR_PTR(-ENOENT);
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@@ -43,9 +36,10 @@
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 int proc_setup_self(struct super_block *s)
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 {
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 	struct inode *root_inode = d_inode(s->s_root);
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-	struct pid_namespace *ns = proc_pid_ns(root_inode);
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+	struct proc_fs_info *fs_info = proc_sb_info(s);
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 	struct dentry *self;
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-	
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+	int ret = -ENOMEM;
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+
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 	inode_lock(root_inode);
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 	self = d_alloc_name(s->s_root, "self");
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 	if (self) {
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@@ -58,20 +52,19 @@
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 			inode->i_gid = GLOBAL_ROOT_GID;
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 			inode->i_op = &proc_self_inode_operations;
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 			d_add(self, inode);
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+			ret = 0;
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 		} else {
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 			dput(self);
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-			self = ERR_PTR(-ENOMEM);
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 		}
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-	} else {
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-		self = ERR_PTR(-ENOMEM);
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 	}
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 	inode_unlock(root_inode);
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-	if (IS_ERR(self)) {
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+
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+	if (ret)
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 		pr_err("proc_fill_super: can't allocate /proc/self\n");
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-		return PTR_ERR(self);
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-	}
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-	ns->proc_self = self;
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-	return 0;
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+	else
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+		fs_info->proc_self = self;
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+
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+	return ret;
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 }
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 void __init proc_self_init(void)