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-rw-r--r--Documentation/filesystems/nfs/Exporting9
1 files changed, 8 insertions, 1 deletions
diff --git a/Documentation/filesystems/nfs/Exporting b/Documentation/filesystems/nfs/Exporting
index 87019d2b598..09994c24728 100644
--- a/Documentation/filesystems/nfs/Exporting
+++ b/Documentation/filesystems/nfs/Exporting
@@ -92,7 +92,14 @@ For a filesystem to be exportable it must:
1/ provide the filehandle fragment routines described below.
2/ make sure that d_splice_alias is used rather than d_add
when ->lookup finds an inode for a given parent and name.
- Typically the ->lookup routine will end with a:
+
+ If inode is NULL, d_splice_alias(inode, dentry) is eqivalent to
+
+ d_add(dentry, inode), NULL
+
+ Similarly, d_splice_alias(ERR_PTR(err), dentry) = ERR_PTR(err)
+
+ Typically the ->lookup routine will simply end with a:
return d_splice_alias(inode, dentry);
}