nfsd: add fh_fsid_match helper

Add a helper to check that the fsid parts of two file handles match.

Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/fs/nfsd/nfsfh.h b/fs/nfsd/nfsfh.h
index e24d95436db3271c1fb2c9e12d28f93a6c40a632..84cae2079d21bba506e2497d40bceeb5539bc1c1 100644 (file)
--- a/fs/nfsd/nfsfh.h
+++ b/fs/nfsd/nfsfh.h
@@ -196,6 +196,15 @@ static inline bool fh_match(struct knfsd_fh *fh1, struct knfsd_fh *fh2)
        return true;
 }
 
+static inline bool fh_fsid_match(struct knfsd_fh *fh1, struct knfsd_fh *fh2)
+{
+       if (fh1->fh_fsid_type != fh2->fh_fsid_type)
+               return false;
+       if (memcmp(fh1->fh_fsid, fh2->fh_fsid, key_len(fh1->fh_fsid_type) != 0))
+               return false;
+       return true;
+}
+
 #ifdef CONFIG_NFSD_V3
 /*
  * The wcc data stored in current_fh should be cleared