new helper: end_writeback()
Essentially, the minimal variant of ->evict_inode(). It's
a trimmed-down clear_inode(), sans any fs callbacks. Once
it returns we know that no async writeback will be happening;
every ->evict_inode() instance should do that once and do that
before doing anything ->write_inode() could interfere with
(e.g. freeing the on-disk inode).
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/inode.c b/fs/inode.c
index 9aff7de..93e7a5e 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -294,6 +294,18 @@
inodes_stat.nr_unused--;
}
+void end_writeback(struct inode *inode)
+{
+ might_sleep();
+ BUG_ON(inode->i_data.nrpages);
+ BUG_ON(!list_empty(&inode->i_data.private_list));
+ BUG_ON(!(inode->i_state & I_FREEING));
+ BUG_ON(inode->i_state & I_CLEAR);
+ inode_sync_wait(inode);
+ inode->i_state = I_FREEING | I_CLEAR;
+}
+EXPORT_SYMBOL(end_writeback);
+
/**
* clear_inode - clear an inode
* @inode: inode to clear