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Add readonly flag

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This commit is contained in:
Vitaliy Filippov
2019-12-01 16:41:07 +03:00
parent 9260cd263a
commit 76655929c4
4 changed files with 46 additions and 24 deletions
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blockstore_init.cpp
+33 -19
View File
@@ -209,9 +209,6 @@ resume_1:
bs->journal.used_start = 512;
bs->journal.next_free = 512;
// Initialize journal "superblock" and the first block
// Cool effect. Same operations result in journal replay.
// FIXME: Randomize initial crc32. Track crc32 when trimming.
GET_SQE();
memset(submitted_buf, 0, 1024);
*((journal_entry_start*)submitted_buf) = {
.crc32 = 0,
@@ -222,25 +219,37 @@ resume_1:
.journal_start = 512,
};
((journal_entry_start*)submitted_buf)->crc32 = je_crc32((journal_entry*)submitted_buf);
data->iov = (struct iovec){ submitted_buf, 1024 };
data->callback = simple_callback;
my_uring_prep_writev(sqe, bs->journal.fd, &data->iov, 1, bs->journal.offset);
wait_count++;
GET_SQE();
my_uring_prep_fsync(sqe, bs->journal.fd, IORING_FSYNC_DATASYNC);
data->iov = { 0 };
data->callback = simple_callback;
wait_count++;
printf("Resetting journal\n");
bs->ringloop->submit();
resume_4:
if (wait_count > 0)
if (bs->readonly)
{
wait_state = 4;
return 1;
printf("Skipping journal initialization because blockstore is readonly\n");
}
else
{
// Cool effect. Same operations result in journal replay.
// FIXME: Randomize initial crc32. Track crc32 when trimming.
GET_SQE();
data->iov = (struct iovec){ submitted_buf, 1024 };
data->callback = simple_callback;
my_uring_prep_writev(sqe, bs->journal.fd, &data->iov, 1, bs->journal.offset);
wait_count++;
GET_SQE();
my_uring_prep_fsync(sqe, bs->journal.fd, IORING_FSYNC_DATASYNC);
data->iov = { 0 };
data->callback = simple_callback;
wait_count++;
printf("Resetting journal\n");
bs->ringloop->submit();
resume_4:
if (wait_count > 0)
{
wait_state = 4;
return 1;
}
}
if (!bs->journal.inmemory)
{
free(submitted_buf);
}
}
else
{
@@ -293,13 +302,18 @@ resume_1:
{
// journal ended
// zero out corrupted entry, if required
if (init_write_buf)
if (init_write_buf && !bs->readonly)
{
GET_SQE();
data->iov = { init_write_buf, 512 };
data->callback = simple_callback;
wait_count++;
my_uring_prep_writev(sqe, bs->journal.fd, &data->iov, 1, bs->journal.offset + init_write_sector);
GET_SQE();
data->iov = { 0 };
data->callback = simple_callback;
wait_count++;
my_uring_prep_fsync(sqe, bs->journal.fd, IORING_FSYNC_DATASYNC);
bs->ringloop->submit();
resume_5:
if (wait_count > 0)