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doc: comment updates

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We stopped using FIEMAP for a number of reasons.  Document some of them.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell
2016-12-27 13:13:28 -05:00
parent efda609f66
commit 7ecead1700
2 changed files with 8 additions and 3 deletions
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9
src/bees.cc
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@ -499,8 +499,13 @@ BeesTempFile::make_copy(const BeesFileRange &src)
THROW_CHECK1(invalid_argument, src, src.size() > 0);
// FIXME: don't know where these come from, but we can't handle them.
// Grab a trace for the log.
// FIEMAP used to give us garbage data, e.g. distinct adjacent
// extents merged into a single entry in the FIEMAP output.
// FIEMAP didn't stop giving us garbage data, we just stopped
// using FIEMAP.
// We shouldn't get absurdly large extents any more; however,
// it's still a problem if we do, so bail out and leave a trace
// in the log.
THROW_CHECK1(invalid_argument, src, src.size() < BLOCK_SIZE_MAX_TEMP_FILE);
realign();