switch minix to ->evict_inode(), fix write_inode/delete_inode race

We need to wait for completion of possible writeback in progress
before we clear on-disk inode during deletion.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/minix/inode.c b/fs/minix/inode.c
index 125062f..e39d6bf 100644
--- a/fs/minix/inode.c
+++ b/fs/minix/inode.c
@@ -24,12 +24,17 @@
 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf);
 static int minix_remount (struct super_block * sb, int * flags, char * data);
 
-static void minix_delete_inode(struct inode *inode)
+static void minix_evict_inode(struct inode *inode)
 {
 	truncate_inode_pages(&inode->i_data, 0);
-	inode->i_size = 0;
-	minix_truncate(inode);
-	minix_free_inode(inode);
+	if (!inode->i_nlink) {
+		inode->i_size = 0;
+		minix_truncate(inode);
+	}
+	invalidate_inode_buffers(inode);
+	end_writeback(inode);
+	if (!inode->i_nlink)
+		minix_free_inode(inode);
 }
 
 static void minix_put_super(struct super_block *sb)
@@ -96,7 +101,7 @@
 	.alloc_inode	= minix_alloc_inode,
 	.destroy_inode	= minix_destroy_inode,
 	.write_inode	= minix_write_inode,
-	.delete_inode	= minix_delete_inode,
+	.evict_inode	= minix_evict_inode,
 	.put_super	= minix_put_super,
 	.statfs		= minix_statfs,
 	.remount_fs	= minix_remount,