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context: don't forget to retry locked extents

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The caller of scan_forward has to stop advancing the BeesFileCrawl
position when an extent lock blocks a scan, so that it will resume
from the same position when the Task is scheduled again; otherwise,
bees simply skips over the extent and leave it incompletely deduped.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell 2022-12-22 00:07:49 -05:00
parent 66b00f8a97
commit c3b664fea5
3 changed files with 15 additions and 9 deletions
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11
src/bees-context.cc
View File

@ -678,7 +678,7 @@ BeesContext::get_inode_mutex(const uint64_t inode)
return m_inode_locks(inode);
}
void
bool
BeesContext::scan_forward(const BeesFileRange &bfr_in)
{
BEESTRACE("scan_forward " << bfr_in);
@ -689,7 +689,7 @@ BeesContext::scan_forward(const BeesFileRange &bfr_in)
// Silently filter out blacklisted files
if (is_blacklisted(bfr_in.fid())) {
BEESCOUNT(scan_blacklisted);
return;
return false;
}
// Reconstitute FD
@ -703,14 +703,14 @@ BeesContext::scan_forward(const BeesFileRange &bfr_in)
if (!bfr.fd()) {
// BEESLOGINFO("No FD in " << root_path() << " for " << bfr);
BEESCOUNT(scan_no_fd);
return;
return false;
}
// Sanity check
if (bfr.begin() >= bfr.file_size()) {
BEESLOGWARN("past EOF: " << bfr);
BEESCOUNT(scan_eof);
return;
return false;
}
BtrfsExtentWalker ew(bfr.fd(), bfr.begin(), root_fd());
@ -729,7 +729,6 @@ BeesContext::scan_forward(const BeesFileRange &bfr_in)
// BEESLOGDEBUG("Deferring extent bytenr " << to_hex(extent_bytenr) << " from " << bfr);
BEESCOUNT(scanf_deferred_extent);
start_over = true;
return;
}
Timer one_extent_timer;
scan_one_extent(bfr, e);
@ -750,7 +749,7 @@ BeesContext::scan_forward(const BeesFileRange &bfr_in)
BEESCOUNTADD(scanf_total_ms, scan_timer.age() * 1000);
BEESCOUNT(scanf_total);
return;
return start_over;
}
BeesResolveAddrResult::BeesResolveAddrResult()

9
src/bees-roots.cc
View File

@ -626,13 +626,20 @@ BeesFileCrawl::crawl_one_extent()
// It might be corrupted data, the file might have been deleted or truncated,
// or we might hit some other recoverable error. We'll try again with
// the next extent.
bool scanned_ok = false;
catch_all([&]() {
BEESNOTE("scan_forward " << bfr);
// BEESLOGDEBUG("scan_forward #" << Task::current_task().id() << " " << bfr);
m_ctx->scan_forward(bfr);
scanned_ok = m_ctx->scan_forward(bfr);
// BEESLOGDEBUG("done_forward #" << Task::current_task().id() << " " << bfr);
} );
if (scanned_ok) {
m_hold = new_holder;
} else {
BEESLOGDEBUG("retrying lock for extent at " << bfr);
BEESCOUNT(crawl_restart);
return true;
}
}
} else {
BEESCOUNT(crawl_hole);

2
src/bees.h
View File

@ -751,7 +751,7 @@ public:
Fd home_fd();
string root_path() const { return m_root_path; }
void scan_forward(const BeesFileRange &bfr);
bool scan_forward(const BeesFileRange &bfr);
bool is_root_ro(uint64_t root);
BeesRangePair dup_extent(const BeesFileRange &src, const shared_ptr<BeesTempFile> &tmpfile);