nfsd: filter lookup results in V4ROOT case
We treat every object as a mountpoint and pretend it doesn't exist if it isn't exported. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
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1 changed files with 14 additions and 1 deletions
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@ -166,6 +166,19 @@ static int nfsd_lookup_parent(struct svc_rqst *rqstp, struct dentry *dparent, st
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return 0;
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}
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/*
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* For nfsd purposes, we treat V4ROOT exports as though there was an
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* export at *every* directory.
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*/
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static int nfsd_mountpoint(struct dentry *dentry, struct svc_export *exp)
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{
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if (d_mountpoint(dentry))
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return 1;
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if (!(exp->ex_flags & NFSEXP_V4ROOT))
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return 0;
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return dentry->d_inode != NULL;
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}
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__be32
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nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp,
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const char *name, unsigned int len,
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@ -211,7 +224,7 @@ nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp,
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/*
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* check if we have crossed a mount point ...
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*/
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if (d_mountpoint(dentry)) {
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if (nfsd_mountpoint(dentry, exp)) {
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if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) {
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dput(dentry);
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goto out_nfserr;
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