1D_SPLICE_ALIAS(9)                The Linux VFS               D_SPLICE_ALIAS(9)
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NAME

6       d_splice_alias - splice a disconnected dentry into the tree if one
7       exists
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SYNOPSIS

10       struct dentry * d_splice_alias(struct inode * inode,
11                                      struct dentry * dentry);
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ARGUMENTS

14       inode
15           the inode which may have a disconnected dentry
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17       dentry
18           a negative dentry which we want to point to the inode.
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DESCRIPTION

21       If inode is a directory and has an IS_ROOT alias, then d_move that in
22       place of the given dentry and return it, else simply d_add the inode to
23       the dentry and return NULL.
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25       If a non-IS_ROOT directory is found, the filesystem is corrupt, and
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WE SHOULD ERROR OUT

28       directories can't have multiple aliases.
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30       This is needed in the lookup routine of any filesystem that is
31       exportable (via knfsd) so that we can build dcache paths to directories
32       effectively.
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34       If a dentry was found and moved, then it is returned. Otherwise NULL is
35       returned. This matches the expected return value of ->lookup.
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37       Cluster filesystems may call this function with a negative, hashed
38       dentry. In that case, we know that the inode will be a regular file,
39       and also this will only occur during atomic_open. So we need to check
40       for the dentry being already hashed only in the final case.
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43Kernel Hackers Manual 3.10         June 2019                 D_SPLICE_ALIAS(9)
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