d_obtain_alias — find or allocate a DISCONNECTED dentry for a given inode
struct dentry * d_obtain_alias ( | struct inode * inode); |
Obtain a dentry for an inode resulting from NFS filehandle conversion or similar open by handle operations. The returned dentry may be anonymous, or may have a full name (if the inode was already in the cache).
When called on a directory inode, we must ensure that the inode only ever has one dentry. If a dentry is found, that is returned instead of allocating a new one.
On successful return, the reference to the inode has been transferred
to the dentry. In case of an error the reference on the inode is released.
To make it easier to use in export operations a NULL or IS_ERR inode may
be passed in and the error will be propagated to the return value,
with a NULL inode replaced by ERR_PTR(-ESTALE).