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exportfs: more detailed comment for path_reconnect
Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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@ -93,7 +93,19 @@ find_disconnected_root(struct dentry *dentry)
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/*
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* Make sure target_dir is fully connected to the dentry tree.
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*
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* It may already be, as the flag isn't always updated when connection happens.
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* On successful return, DCACHE_DISCONNECTED will be cleared on
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* target_dir, and target_dir->d_parent->...->d_parent will reach the
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* root of the filesystem.
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*
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* Whenever DCACHE_DISCONNECTED is unset, target_dir is fully connected.
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* But the converse is not true: target_dir may have DCACHE_DISCONNECTED
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* set but already be connected. In that case we'll verify the
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* connection to root and then clear the flag.
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*
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* Note that target_dir could be removed by a concurrent operation. In
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* that case reconnect_path may still succeed with target_dir fully
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* connected, but further operations using the filehandle will fail when
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* necessary (due to S_DEAD being set on the directory).
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*/
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static int
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reconnect_path(struct vfsmount *mnt, struct dentry *target_dir, char *nbuf)
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