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Merge pull request #1076 from ThomasWaldmann/docs-chunker-kernel-version

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clarify comment about linux kernel versions, fixes #1024
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TW 2016-05-21 21:17:13 +02:00
commit 166352ee25
1 changed files with 4 additions and 4 deletions
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borg/_chunker.c
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@ -196,10 +196,10 @@ chunker_fill(Chunker *c)
// We rollback the initial offset back to the start of the page,
// to avoid it not being truncated as a partial page request.
if (length > 0) {
// Linux kernels prior to 4.7 have a bug where they truncate
// last partial page of POSIX_FADV_DONTNEED request, so we need
// to page-align it ourselves. We'll need the rest of this page
// on the next read (assuming this was not EOF)
// All Linux kernels (at least up to and including 4.6(.0)) have a bug where
// they truncate last partial page of POSIX_FADV_DONTNEED request, so we need
// to page-align it ourselves. We'll need the rest of this page on the next
// read (assuming this was not EOF).
overshoot = (offset + length) & pagemask;
} else {
// For length == 0 we set overshoot 0, so the below