Ext4 Punch Hole Change Summary v6->v7

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Hi All,

This is an updated copy of punch hole that has the while loop optimization for ext4_ext_remove_space (in patch 3/5). The optimization limits the tree searching to only the extents that are to be removed instead of searching the entire tree.

Also, I updated my base code to the latest copy of the ext4 code, and one of the punch hole test cases found a null pointer bug when trying to create a directory when the disk is full. It is not directly related to punch hole, so I put it in a separate patch. Jan, this looks like it may have been related to the "[PATCH 1/2] ext4: Fix fs corruption when make_indexed_dir() fails" patch. Would you mind taking a look at it and giving it your OK if everything looks good? Thx!

Allison Henderson
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