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Implement sparse block bitmap to avoid zero-fill

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This commit is contained in:
Vitaliy Filippov
2020-01-12 02:55:32 +03:00
parent 4b05bde3a2
commit cf819eb442
9 changed files with 298 additions and 147 deletions
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blockstore_write.cpp
+11 -15
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@@ -106,28 +106,24 @@ int blockstore_impl_t::dequeue_write(blockstore_op_t *op)
printf("Allocate block %lu\n", loc);
#endif
data_alloc->set(loc, true);
uint64_t stripe_offset = (op->offset % BITMAP_GRANULARITY);
uint64_t stripe_end = (op->offset + op->len) % BITMAP_GRANULARITY;
// Zero fill up to BITMAP_GRANULARITY
int vcnt = 0;
uint64_t stripe_offset = 0;
if (op->len != block_size && zerofill_enabled)
if (stripe_offset)
{
// Zero fill newly allocated object if required
if (op->offset > 0)
PRIV(op)->iov_zerofill[vcnt++] = (struct iovec){ zero_object, op->offset };
PRIV(op)->iov_zerofill[vcnt++] = (struct iovec){ op->buf, op->len };
if (op->offset+op->len < block_size)
PRIV(op)->iov_zerofill[vcnt++] = (struct iovec){ zero_object, block_size - (op->offset + op->len) };
data->iov.iov_len = block_size;
PRIV(op)->iov_zerofill[vcnt++] = (struct iovec){ zero_object, stripe_offset };
}
else
PRIV(op)->iov_zerofill[vcnt++] = (struct iovec){ op->buf, op->len };
if (stripe_end)
{
vcnt = 1;
PRIV(op)->iov_zerofill[0] = (struct iovec){ op->buf, op->len };
data->iov.iov_len = op->len; // to check it in the callback
stripe_offset = op->offset;
stripe_end = BITMAP_GRANULARITY - stripe_end;
PRIV(op)->iov_zerofill[vcnt++] = (struct iovec){ zero_object, stripe_end };
}
data->iov.iov_len = op->len + stripe_offset + stripe_end; // to check it in the callback
data->callback = [this, op](ring_data_t *data) { handle_write_event(data, op); };
my_uring_prep_writev(
sqe, data_fd, PRIV(op)->iov_zerofill, vcnt, data_offset + (loc << block_order) + stripe_offset
sqe, data_fd, PRIV(op)->iov_zerofill, vcnt, data_offset + (loc << block_order) + op->offset - stripe_offset
);
PRIV(op)->pending_ops = 1;
PRIV(op)->min_used_journal_sector = PRIV(op)->max_used_journal_sector = 0;