New method - evict_inode()

Hybrid of ->clear_inode() and ->delete_inode(); if present, does
all fs work to be done when in-core inode is about to be gone,
for whatever reason.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/inode.c

diff --git a/fs/inode.c b/fs/inode.c
index 60cb259..474a72f 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -325,7 +325,9 @@
 {
 	const struct super_operations *op = inode->i_sb->s_op;
 
-	if (delete && op->delete_inode) {
+	if (op->evict_inode) {
+		op->evict_inode(inode);
+	} else if (delete && op->delete_inode) {
 		op->delete_inode(inode);
 	} else {
 		if (inode->i_data.nrpages)