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workarounds: add workaround for btrfs send

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Introduce --workaround options which trade performance or effectiveness to
avoid triggering kernel bugs.

The first such option is --workaround-btrfs-send, which avoids making any
modification to read-only subvols to avoid btrfs send bugs.

Clean up usage message:  no tabs for formatting, split options into
sections by theme.

Make scan mode a non-static data member like all (most?) other options.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell
2018-11-17 00:46:58 -05:00
parent 6c68e81da7
commit 23f3e4ec42
4 changed files with 159 additions and 38 deletions
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15
src/bees-context.cc
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@ -178,15 +178,28 @@ BeesContext::BeesContext(shared_ptr<BeesContext> parent) :
}
}
bool
BeesContext::is_root_ro(uint64_t root)
{
return roots()->is_root_ro(root);
}
bool
BeesContext::dedup(const BeesRangePair &brp)
{
// TOOLONG and NOTE can retroactively fill in the filename details, but LOG can't
BEESNOTE("dedup " << brp);
brp.first.fd(shared_from_this());
brp.second.fd(shared_from_this());
if (is_root_ro(brp.second.fid().root())) {
// BEESLOGDEBUG("WORKAROUND: dst subvol is read-only in " << name_fd(brp.second.fd()));
BEESCOUNT(dedup_workaround_btrfs_send);
return false;
}
brp.first.fd(shared_from_this());
BEESTOOLONG("dedup " << brp);
BeesAddress first_addr(brp.first.fd(), brp.first.begin());