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-rw-r--r--fs/nfsd/export.c1
-rw-r--r--include/linux/nfsd/export.h10
2 files changed, 11 insertions, 0 deletions
diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index cb3dae2fcd8..c64d55f319b 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -1425,6 +1425,7 @@ static struct flags {
{ NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
{ NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
{ NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
+ { NFSEXP_V4ROOT, {"v4root", ""}},
#ifdef MSNFS
{ NFSEXP_MSNFS, {"msnfs", ""}},
#endif
diff --git a/include/linux/nfsd/export.h b/include/linux/nfsd/export.h
index 4cafbe1255f..41f0d4e2537 100644
--- a/include/linux/nfsd/export.h
+++ b/include/linux/nfsd/export.h
@@ -39,6 +39,16 @@
#define NFSEXP_FSID 0x2000
#define NFSEXP_CROSSMOUNT 0x4000
#define NFSEXP_NOACL 0x8000 /* reserved for possible ACL related use */
+/*
+ * The NFSEXP_V4ROOT flag causes the kernel to give access only to NFSv4
+ * clients, and only to the single directory that is the root of the
+ * export; further lookup and readdir operations are treated as if every
+ * subdirectory was a mountpoint, and ignored if they are not themselves
+ * exported. This is used by nfsd and mountd to construct the NFSv4
+ * pseudofilesystem, which provides access only to paths leading to each
+ * exported filesystem.
+ */
+#define NFSEXP_V4ROOT 0x10000
/* All flags that we claim to support. (Note we don't support NOACL.) */
#define NFSEXP_ALLFLAGS 0x7E3F