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context: get rid of resolve (LOGICAL_INO) serializer

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There are kernel bugs in LOGICAL_INO from time to time; however, we
can't avoid these bugs by serializing LOGICAL_INO calls.

It hasn't been used for some time, so remove the code and
less-than-completely-accurate comments.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell
2021-12-19 14:50:38 -05:00
parent 007067b83f
commit 6d6686eb5b
2 changed files with 0 additions and 21 deletions
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18
src/bees-context.cc
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@@ -845,24 +845,6 @@ BeesContext::resolve_addr_uncached(BeesAddress addr)
// transaction latency, competing threads, and freeze/SIGSTOP
// pausing the bees process.
// There can be only one of these running at a time, or some lingering
// backref bug will kill the whole system. Also it looks like there
// are so many locks held while LOGICAL_INO runs that there is no
// point in trying to run two of them on the same filesystem.
// ...but it works most of the time, and the performance hit from
// not running resolve in multiple threads is significant.
// But "most of the time" really just means "between forced reboots",
// and with recent improvements in kernel uptime, this is now in the
// top 3 crash causes.
static mutex s_resolve_mutex;
unique_lock<mutex> lock(s_resolve_mutex, defer_lock);
if (BEES_SERIALIZE_RESOLVE) {
BEESNOTE("waiting to resolve addr " << addr);
lock.lock();
}
// Is there a bug where resolve and balance cause a crash (BUG_ON at fs/btrfs/ctree.c:1227)?
// Apparently yes, and more than one.
// Wait for the balance to finish before we run LOGICAL_INO
wait_for_balance();

3
src/bees.h
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@@ -110,9 +110,6 @@ const size_t BEES_TRANSID_FACTOR = 10;
// Wait this long for a balance to stop
const double BEES_BALANCE_POLL_INTERVAL = 60.0;
// Workaround for backref bugs
const bool BEES_SERIALIZE_RESOLVE = false;
// Workaround for tree mod log bugs
const bool BEES_SERIALIZE_BALANCE = false;