linux-kernel - About mounting the sysfs

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Message-ID: <105610bf0712172310ob56ae9ch4fa63e132011ae18@mail.gmail.com>
Date:	Tue, 18 Dec 2007 15:10:50 +0800
From:	wit <is01kzh@...il.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: About mounting the sysfs

Hi all,
    Currently, I'm studying the code of the sysfs. But I got the
following questions:

1. What is the d_alloc_root used for? Actually, the question should
be: why we have to call d_alloc_root. I think the root already has its
dentry, why we have to allocate another while we mounting a file
system?

2. Why we call d_alloc_root to allocate a dentry for the mount point
while the usual mount point of sysfs is defined by the user (something
like /sysfs but not /). See below:
	root = d_alloc_root(inode);
	if (!root) {
		pr_debug("%s: could not get root dentry!\n",__FUNCTION__);
		iput(inode);
		return -ENOMEM;
	}
	root->d_fsdata = &sysfs_root;
	sb->s_root = root;

does this means settting the sysfs' mount point to "/" but not "/sysfs".

Thanks.

--Zhanhua
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