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bcache: nr_ios_pending wasn't being incremented

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... but it was being decremented on completion.  Which meant
it wrapped, and no prefetches were ever issued after the
first completion.
This commit is contained in:
Joe Thornber 2018-05-16 10:09:17 +01:00
parent 413488edc6
commit df2acbbb97
2 changed files with 45 additions and 1 deletions
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1
lib/device/bcache.c
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@ -667,6 +667,7 @@ static void _issue_low_level(struct block *b, enum dir d)
b->io_dir = d;
_set_flags(b, BF_IO_PENDING);
cache->nr_io_pending++;
dm_list_move(&cache->io_pending, &b->list);

45
test/unit/bcache_t.c
View File

@ -504,7 +504,7 @@ static void test_prefetch_issues_a_read(void *context)
_expect_read(me, fd, i);
bcache_prefetch(cache, fd, i);
}
_no_outstanding_expectations(me);
for (i = 0; i < nr_cache_blocks; i++) {
_expect(me, E_WAIT);
@ -810,6 +810,47 @@ static void test_invalidate_held_block(void *context)
bcache_put(b);
}
//----------------------------------------------------------------
// Chasing a bug reported by dct
static void _cycle(struct fixture *f, unsigned nr_cache_blocks)
{
struct mock_engine *me = f->me;
struct bcache *cache = f->cache;
unsigned i;
struct block *b;
for (i = 0; i < nr_cache_blocks; i++) {
// prefetch should not wait
_expect_read(me, i, 0);
bcache_prefetch(cache, i, 0);
}
// This double checks the reads occur in response to the prefetch
_no_outstanding_expectations(me);
for (i = 0; i < nr_cache_blocks; i++) {
_expect(me, E_WAIT);
T_ASSERT(bcache_get(cache, i, 0, 0, &b));
bcache_put(b);
}
_no_outstanding_expectations(me);
}
static void test_concurrent_reads_after_invalidate(void *context)
{
struct fixture *f = context;
unsigned i, nr_cache_blocks = 16;
_cycle(f, nr_cache_blocks);
fprintf(stderr, "cycle 1 complete\n");
for (i = 0; i < nr_cache_blocks; i++)
bcache_invalidate_fd(f->cache, i);
_cycle(f, nr_cache_blocks);
fprintf(stderr, "cycle 2 complete\n");
}
/*----------------------------------------------------------------
* Top level
@ -859,6 +900,8 @@ static struct test_suite *_small_tests(void)
T("invalidate-read-error", "invalidate a block that errored", test_invalidate_after_read_error);
T("invalidate-write-error", "invalidate a block that errored", test_invalidate_after_write_error);
T("invalidate-fails-in-held", "invalidating a held block fails", test_invalidate_held_block);
T("concurrent-reads-after-invalidate", "prefetch should still issue concurrent reads after invalidate",
test_concurrent_reads_after_invalidate);
return ts;
}