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btrsame: clean out some cruft

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That reboot we were waiting for happened in 2015.

Also, never use the clone for dedupe.  Kernels old enough to not have
dedupe have far too many bugs anyway.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell 2020-03-05 17:47:28 -05:00
parent 593a55e829
commit 78134bfd78
1 changed files with 2 additions and 12 deletions
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14
src/btrsame.cc
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@ -21,24 +21,14 @@
using namespace crucible;
using namespace std;
// until we reboot some machines
// it's time to reboot some machines
// not until the latest memory leak is fixed
// OK Go
#if 1
#define EXTENT_SAME_CLASS BtrfsExtentSame
static const bool ALWAYS_ALIGN = false;
#else
#define EXTENT_SAME_CLASS BtrfsExtentSameByClone
static const bool ALWAYS_ALIGN = false;
#endif
static const int EXTENT_ALIGNMENT = 4096;
// Not much point in exceeding this. btrfs should (?) merge adjacent
// extents, non-adjacent extents have to be separate anyway, and it has
// really nasty latency when it gets big.
// const off_t max_step_size = BTRFS_MAX_DEDUPE_LEN;
// btrfs maximum extent size is 128M, there is nothing to gain by going larger;
// however, going smaller will create a bunch of adjacent split extent refs.
const off_t max_step_size = 128 * 1024 * 1024;
// Not a good idea to go below 4K