[PATCH 1/5] NFSD: Store parent's stat in a sperate value

[Kinglong Mee <kinglongmee@gmail.com>]

Commit ae7095a7c4 (nfsd4: helper function for getting mounted_on ino)
don't process the return value from get_parent_attributes().

Also, the following FATTR4_WORD2_LAYOUT_BLKSIZE will using stat.blksize,
using an independent value for parent's attributes.

Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
---
 fs/nfsd/nfs4xdr.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 5463385..f11003c 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -2674,6 +2674,9 @@ out_acl:
 		*p++ = cpu_to_be32(stat.mtime.tv_nsec);
 	}
 	if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
+		struct kstat parent_stat;
+		u64 ino = stat.ino;
+
 		p = xdr_reserve_space(xdr, 8);
 		if (!p)
                 	goto out_resource;
@@ -2682,9 +2685,13 @@ out_acl:
 		 * and this is the root of a cross-mounted filesystem.
 		 */
 		if (ignore_crossmnt == 0 &&
-		    dentry == exp->ex_path.mnt->mnt_root)
-			get_parent_attributes(exp, &stat);
-		p = xdr_encode_hyper(p, stat.ino);
+		    dentry == exp->ex_path.mnt->mnt_root) {
+			err = get_parent_attributes(exp, &parent_stat);
+			if (err)
+				goto out_nfserr;
+			ino = parent_stat.ino;
+		}
+		p = xdr_encode_hyper(p, ino);
 	}
 #ifdef CONFIG_NFSD_PNFS
 	if ((bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) ||
-- 
2.4.3