From 51aa322849581f1a73594e48ea0df63f914ee6a2 Mon Sep 17 00:00:00 2001 From: Mikulas Patocka Date: Mon, 22 Jun 2009 10:12:26 +0100 Subject: [PATCH] dm io: retry after barrier error 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 Signed-off-by: Alasdair G Kergon --- drivers/md/dm-io.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c index a89f41f0075..3a2e6a2f8bd 100644 --- a/drivers/md/dm-io.c +++ b/drivers/md/dm-io.c @@ -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; -- 2.11.4.GIT