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NAS-140523 / 27.0.0-BETA.1 / NFSD: return ESTALE for snapdir entries when export lookup fails #243

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Merged
ixhamza merged 1 commit into from
Apr 3, 2026
+17 −2
Merged

NAS-140523 / 27.0.0-BETA.1 / NFSD: return ESTALE for snapdir entries when export lookup fails #243

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19 changes: 17 additions & 2 deletions fs/nfsd/vfs.c
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Original file line number Diff line number Diff line change
Expand Up @@ -204,8 +204,23 @@ nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp,
* allowed without an explicit export of the new
* directory.
*/
if (err == -ENOENT && !(exp->ex_flags & NFSEXP_V4ROOT))
err = 0;
if (err == -ENOENT && !(exp->ex_flags & NFSEXP_V4ROOT)) {
#ifdef CONFIG_TRUENAS
/*
* For ZFS snapshot entries under a zfs_snapdir
* export, the fallback dentry is an automount
* stub with simple_dir_operations that returns
* empty READDIR (NFS4_OK, zero entries). The
* client caches this silently with no error
* signal to trigger re-resolution. Return ESTALE
* so the client retries via LOOKUP.
*/
if (is_snapdir)
err = -ESTALE;
else
#endif /* CONFIG_TRUENAS */
err = 0;
}
path_put(&path);
goto out;
}
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