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clarify comment about linux kernel versions

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currently, ALL linux kernels are affected.
This commit is contained in:
Thomas Waldmann 2016-05-21 21:08:03 +02:00
parent 1a0277021c
commit 99fa484726
1 changed files with 4 additions and 4 deletions
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8
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, // We rollback the initial offset back to the start of the page,
// to avoid it not being truncated as a partial page request. // to avoid it not being truncated as a partial page request.
if (length > 0) { if (length > 0) {
// Linux kernels prior to 4.7 have a bug where they truncate // All Linux kernels (at least up to and including 4.6(.0)) have a bug where
// last partial page of POSIX_FADV_DONTNEED request, so we need // 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 // to page-align it ourselves. We'll need the rest of this page on the next
// on the next read (assuming this was not EOF) // read (assuming this was not EOF).
overshoot = (offset + length) & pagemask; overshoot = (offset + length) & pagemask;
} else { } else {
// For length == 0 we set overshoot 0, so the below // For length == 0 we set overshoot 0, so the below