Re: Getting dentry from inode

[Dave Kleikamp <shaggy@austin.ibm.com>]

On Mon, 2006-04-17 at 10:08 -0700, UZAIR LAKHANI wrote:
> Hello All,
> 
> I want to know about these two questions.
> 
> (1) How to get a pointer to an inode if one has only
> the inode number available. May I use the iget()
> function. I only want a reference to the inode whose
> number I have.

It sounds like iget() is what you want.

> (2) How to get the dentry from inode. Is d_find_alias
> ok. There can be multiple dentries attached to a
> single inode then which dentry will d_find_alias will
> return. I want only access to a dentry from inode
> number.

I think d_alloc_anon() may do what you want.

inode = iget(sb, inum);
if (!inode)
	bail out;
if (is_bad_inode(inode)) {
	iput(inode);
	bail out;
}
dentry = d_alloc_anon(inode);
if (!dentry) {
	iput(inode)
	bail out;
}
d_alloc_anon returns an existing dentry for the inode if it can find
one.  Otherwise, it will allocate a new, anonymous dentry.

> Thanks,
> Uzair Lakhani

Hope this helps,
Shaggy
-- 
David Kleikamp
IBM Linux Technology Center