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ext4: add punching hole support for non-extent-mapped files
This patch add supports for indirect file support punching hole. It is almost the same as ext4_ext_punch_hole. First, we invalidate all pages between this hole, and then we try to deallocate all blocks of this hole. A recursive function is used to handle deallocation of blocks. In this function, it iterates over the entries in inode's i_blocks or indirect blocks, and try to free the block for each one of them. After applying this patch, xfstest torvalds#255 will not pass w/o extent because indirect-based file doesn't support unwritten extents. Signed-off-by: Zheng Liu <[email protected]> Signed-off-by: "Theodore Ts'o" <[email protected]>
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