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context: workaround to prevent LOGICAL_INO and btrfs balance from running concurrently

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This avoids some kernel bugs.  One of them is fixed in 5.3.4 and later:

	efad8a853a "Btrfs: fix use-after-free when using the tree modification log"

There are apparently others in current kernels, so for now just put bees
on pause until the balance is done.

At some point we may want to provide an option to disable this
workaround; however, running bees and balance at the same time makes
neither particularly fast, so maybe we'll just leave it this way.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell
2019-11-19 16:01:31 -05:00
committed by Kai Krakow
parent 6e75857d71
commit ac53e50d3e
2 changed files with 35 additions and 0 deletions
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4
src/bees.h
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@@ -117,6 +117,9 @@ const size_t BEES_TRANSID_FACTOR = 10;
// The actual limit in LOGICAL_INO seems to be 2730, but let's leave a little headroom
const size_t BEES_MAX_EXTENT_REF_COUNT = 2560;
// Wait this long for a balance to stop
const double BEES_BALANCE_POLL_INTERVAL = 60.0;
// Flags
const int FLAGS_OPEN_COMMON = O_NOFOLLOW | O_NONBLOCK | O_CLOEXEC | O_NOATIME | O_LARGEFILE | O_NOCTTY;
const int FLAGS_OPEN_DIR = FLAGS_OPEN_COMMON | O_RDONLY | O_DIRECTORY;
@@ -716,6 +719,7 @@ class BeesContext : public enable_shared_from_this<BeesContext> {
void set_root_fd(Fd fd);
BeesResolveAddrResult resolve_addr_uncached(BeesAddress addr);
void wait_for_balance();
BeesFileRange scan_one_extent(const BeesFileRange &bfr, const Extent &e);
void rewrite_file_range(const BeesFileRange &bfr);