'\" t
.\"     Title: d_splice_alias
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\"      Date: January 2017
.\"    Manual: The Linux VFS
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "D_SPLICE_ALIAS" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "The Linux VFS"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
d_splice_alias \- splice a disconnected dentry into the tree if one exists
.SH "SYNOPSIS"
.HP \w'struct\ dentry\ *\ d_splice_alias('u
.BI "struct dentry * d_splice_alias(struct\ inode\ *\ " "inode" ", struct\ dentry\ *\ " "dentry" ");"
.SH "ARGUMENTS"
.PP
\fIinode\fR
.RS 4
the inode which may have a disconnected dentry
.RE
.PP
\fIdentry\fR
.RS 4
a negative dentry which we want to point to the inode\&.
.RE
.SH "DESCRIPTION"
.PP
If inode is a directory and has an IS_ROOT alias, then d_move that in place of the given dentry and return it, else simply d_add the inode to the dentry and return NULL\&.
.PP
If a non\-IS_ROOT directory is found, the filesystem is corrupt, and we should error out: directories can\*(Aqt have multiple aliases\&.
.PP
This is needed in the lookup routine of any filesystem that is exportable (via knfsd) so that we can build dcache paths to directories effectively\&.
.PP
If a dentry was found and moved, then it is returned\&. Otherwise NULL is returned\&. This matches the expected return value of \->lookup\&.
.PP
Cluster filesystems may call this function with a negative, hashed dentry\&. In that case, we know that the inode will be a regular file, and also this will only occur during atomic_open\&. So we need to check for the dentry being already hashed only in the final case\&.
.SH "COPYRIGHT"
.br