exportfs: use dget_parent
Use dget_parent instead of opencoding it. This simplifies the code, but more importanly prepares for the more complicated locking for a parent dget in the dcache scale patch series. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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@ -74,21 +74,20 @@ static struct dentry *
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find_disconnected_root(struct dentry *dentry)
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{
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dget(dentry);
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spin_lock(&dentry->d_lock);
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while (!IS_ROOT(dentry) &&
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(dentry->d_parent->d_flags & DCACHE_DISCONNECTED)) {
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struct dentry *parent = dentry->d_parent;
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dget(parent);
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spin_unlock(&dentry->d_lock);
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while (!IS_ROOT(dentry)) {
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struct dentry *parent = dget_parent(dentry);
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if (!(parent->d_flags & DCACHE_DISCONNECTED)) {
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dput(parent);
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break;
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}
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dput(dentry);
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dentry = parent;
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spin_lock(&dentry->d_lock);
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}
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spin_unlock(&dentry->d_lock);
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return dentry;
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}
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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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