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Add an archive layer ioctl for converting offline extents into sparse extents without relying on or modifying data_version. This is helpful when working with files with very large sparse regions. Signed-off-by: Zach Brown <zab@versity.com>
The current code here only works if the passed in start block is exactly the start of an offline extent. On top of that, it only will punch a single extent, ever, due to the test used after finding an extent. The reason is that we break the loop if the start isn't exactly the first block of the extent, even if the last block of the extent is within the wanted hole. With this change, it doesn't matter if the start is either part of an offline extent, or a hole, and, we can punch holes that encompass multiple extents separated by holes, punching all of them away. Signed-off-by: Auke Kok <auke.kok@versity.com>
A minimal punch_offline ioctl wrapper. Argument style is adopted from stage/release. Following the syntax for the option of stage/release, this calls the punch offline ioctl, punching any offline extent within the designated range from offset with length. Signed-off-by: Auke Kok <auke.kok@versity.com>
Basic testing for the punch-offline ioctl code. The tests consist of a bunch of negative testing to make sure things that are expressly not allowed fail, followed by a bunch of known-expected outcome tests that punches holes in several patterns, verifying them. Signed-off-by: Auke Kok <auke.kok@versity.com>
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