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| author | Mikulas Patocka <mpatocka@redhat.com> | 2009-06-22 10:12:26 +0100 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2009-06-22 10:12:26 +0100 |
| commit | 51aa322849581f1a73594e48ea0df63f914ee6a2 (patch) | |
| tree | 19b3545084700fc36b5a916d71473936628bb062 /drivers/md/dm-io.c | |
| parent | 5af443a7e1c0864100cc44525a9821aa2a2f4719 (diff) | |
| download | lwn-51aa322849581f1a73594e48ea0df63f914ee6a2.tar.gz lwn-51aa322849581f1a73594e48ea0df63f914ee6a2.zip | |
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 <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm-io.c')
| -rw-r--r-- | drivers/md/dm-io.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c index a89f41f00757..3a2e6a2f8bdd 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; |