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Fix db_wal_test::TruncateLastLogAfterRecoverWithoutFlush failure (#6437) 

Summary:
`TruncateLastLogAfterRecoverWithoutFlush` case depends on fallocate support
of underlying file system.

On a file system which lacks of this feature, like zfs, it will fail to allocate predefined file size as this test case intends to do;

So a check block is added to detect fallocate support and skip test if not.
The related work is done by JunHe77. Thanks!

Signed-off-by: Yuqi Gu <yuqi.gu@arm.com>
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6437

Differential Revision: D20145032

Pulled By: pdillinger

fbshipit-source-id: c8b691dc508e95acfa2a004ddbc07e2faa76680d
This commit is contained in:
Yuqi Gu 2020-03-05 17:15:49 -08:00 committed by Facebook Github Bot
parent afb97094ae
commit e171a219d5
1 changed files with 18 additions and 0 deletions
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18
db/db_wal_test.cc
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@ -1528,6 +1528,24 @@ TEST_F(DBWALTest, TruncateLastLogAfterRecoverWithoutFlush) {
constexpr size_t kKB = 1024;
Options options = CurrentOptions();
options.avoid_flush_during_recovery = true;
// Test fallocate support of running file system.
// Skip this test if fallocate is not supported.
std::string fname_test_fallocate = dbname_ + "/preallocate_testfile";
int fd = -1;
do {
fd = open(fname_test_fallocate.c_str(), O_CREAT | O_RDWR | O_TRUNC, 0644);
} while (fd < 0 && errno == EINTR);
ASSERT_GT(fd, 0);
int alloc_status = fallocate(fd, 0, 0, 1);
int err_number = errno;
close(fd);
ASSERT_OK(options.env->DeleteFile(fname_test_fallocate));
if (err_number == ENOSYS || err_number == EOPNOTSUPP) {
fprintf(stderr, "Skipped preallocated space check: %s\n", strerror(err_number));
return;
}
ASSERT_EQ(0, alloc_status);
DestroyAndReopen(options);
size_t preallocated_size =
dbfull()->TEST_GetWalPreallocateBlockSize(options.write_buffer_size);