On Fri, 23 Mar 2012 13:46:35 -0700 (PDT)
Hugh Dickins [off-list ref] wrote:

+/**
+ * truncate_pagecache_range - unmap and remove pagecache that is hole-punched
+ * @inode: inode
+ * @lstart: offset of beginning of hole
+ * @lend: offset of last byte of hole
+ *
+ * This function should typically be called before the filesystem
+ * releases resources associated with the freed range (eg. deallocates
+ * blocks). This way, pagecache will always stay logically coherent
+ * with on-disk format, and the filesystem would not have to deal with
+ * situations such as writepage being called for a page that has already
+ * had its underlying blocks deallocated.
+ */

--- a/mm/truncate.c~mm-for-fs-add-truncate_pagecache_range-fix
+++ a/mm/truncate.c

@@ -639,6 +639,9 @@ int vmtruncate_range(struct inode *inode
  * with on-disk format, and the filesystem would not have to deal with
  * situations such as writepage being called for a page that has already
  * had its underlying blocks deallocated.
+ *
+ * Must be called with inode->i_mapping->i_mutex held.
+ * Takes inode->i_mapping->i_mmap_mutex.
  */
 void truncate_pagecache_range(struct inode *inode, loff_t lstart, loff_t lend)
 {

yes?

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