dm io: retry after barrier error (51aa3228) · Commits · 戴 / test

If -EOPNOTSUPP was returned and the request was a barrier request, retry it without barrier. Retry all regions for now. Barriers are submitted only for one-region requests, so it doesn't matter. (In the future, retries can be limited to the actual regions that failed.) Signed-off-by:

Mikulas Patocka <mpatocka@redhat.com> Signed-off-by:

Alasdair G Kergon <agk@redhat.com>

drivers/md/dm-io.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -364,6 +364,7 @@ static int sync_io(struct dm_io_client *client, unsigned int num_regions,
		return -EIO;
		}

		retry:
		io.error_bits = 0;
		io.eopnotsupp_bits = 0;
		atomic_set(&io.count, 1); /* see dispatch_io() */
		@@ -382,6 +383,11 @@ static int sync_io(struct dm_io_client *client, unsigned int num_regions,
		}
		set_current_state(TASK_RUNNING);

		if (io.eopnotsupp_bits && (rw & (1 << BIO_RW_BARRIER))) {
		rw &= ~(1 << BIO_RW_BARRIER);
		goto retry;
		}

		if (error_bits)
		*error_bits = io.error_bits;

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