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dm io: retry after barrier error

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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>
This commit is contained in:
Mikulas Patocka 2009-06-22 10:12:26 +01:00 committed by Alasdair G Kergon
parent 5af443a7e1
commit 51aa322849
1 changed files with 6 additions and 0 deletions
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6
drivers/md/dm-io.c
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@ -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;