D_OBTAIN_ALIAS - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : The Linux VFS

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NAMEd_obtain_alias − find or allocate a dentry for a given inode

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SYNOPSISstruct dentry * d_obtain_alias(struct inode * inode);

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ARGUMENTSinode inode to allocate the dentry for

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DESCRIPTIONObtain 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 will be the error will be propagate to the return value, with a NULL inode replaced by ERR_PTR(−ESTALE)​.

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