Re: 答复: parent inode from the current struct inode

2012/2/8 Tom Lai(IT) [off-list ref]:

Hi Philipp,

I checked 2.6.32 that dentry struct contained parent dentry struct.


Hi Jack,

On Wed, Feb 8, 2012 at 8:48 AM, Jack David [off-list ref] wrote:

quoted

Hi All,

Is possible to get parent directory's inode structure from the current
inode? If so, how can I do that?

It should be possible to use the container_of macro to get the parent
dentry struct. Then, you can get the parent dentry d_parent and access
its inode. (Please correct me, if I'm wrong. I didn't test it).

Okay, I tried container_of, but it did not work. So I tried
d_obtain_alias() which worked.

But I am not sure if I  have to make a call to dput() as well in order
to free the dentry obtained.
Anyone can confirm this?

J

Philipp

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-- 
J

Hi Jack,

On Wed, Feb 8, 2012 at 2:00 PM, Jack David [off-list ref] wrote:

Okay, I tried container_of, but it did not work. So I tried
d_obtain_alias() which worked.

But I am not sure if I ?have to make a call to dput() as well in order
to free the dentry obtained.
Anyone can confirm this?

since d_obtain_alias() calls dput when something goes wrong after
allocating the dentry, I'm assuming that you also have to call dput to
free the dentry.



Philipp