From: Andrey Vesnovaty <andrey.vesnovaty@gmail.com>
Date: Tue, 30 Jul 2013 09:59:34 +0000 (+0300)
Subject: Fix invalid fileid for snapshot root dentry
X-Git-Tag: zfs-0.6.5~7
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=aa9b27080b3411cddf93391bef3090a1a3fcaccc;p=zfs

Fix invalid fileid for snapshot root dentry

Prevents NFS client from detection of different fileids of snapshot root dentry
before & after snapshot mount.

Signed-off-by: Andrey Vesnovaty <andrey.vesnovaty@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
---

diff --git a/module/zfs/zfs_vnops.c b/module/zfs/zfs_vnops.c
index 53d02a3aa..944f0ad3d 100644
--- a/module/zfs/zfs_vnops.c
+++ b/module/zfs/zfs_vnops.c
@@ -2415,6 +2415,16 @@ zfs_getattr_fast(struct inode *ip, struct kstat *sp)
 
 	mutex_exit(&zp->z_lock);
 
+	/*
+	 * Required to prevent NFS client from detecting different inode
+	 * numbers of snapshot root dentry before and after snapshot mount.
+	 */
+	if (zsb->z_issnap) {
+		if (ip->i_sb->s_root->d_inode == ip)
+			sp->ino = ZFSCTL_INO_SNAPDIRS -
+				dmu_objset_id(zsb->z_os);
+	}
+
 	ZFS_EXIT(zsb);
 
 	return (0);