dm io: record eopnotsupp
Add another field, eopnotsupp_bits. It is subset of error_bits, representing
regions that returned -EOPNOTSUPP. (The bit is set in both error_bits and
eopnotsupp_bits).
This value will be used in further patches.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c
index e73aabd..a89f41f 100644
--- a/drivers/md/dm-io.c
+++ b/drivers/md/dm-io.c
@@ -22,6 +22,7 @@
/* FIXME: can we shrink this ? */
struct io {
unsigned long error_bits;
+ unsigned long eopnotsupp_bits;
atomic_t count;
struct task_struct *sleeper;
struct dm_io_client *client;
@@ -107,8 +108,11 @@
*---------------------------------------------------------------*/
static void dec_count(struct io *io, unsigned int region, int error)
{
- if (error)
+ if (error) {
set_bit(region, &io->error_bits);
+ if (error == -EOPNOTSUPP)
+ set_bit(region, &io->eopnotsupp_bits);
+ }
if (atomic_dec_and_test(&io->count)) {
if (io->sleeper)
@@ -361,6 +365,7 @@
}
io.error_bits = 0;
+ io.eopnotsupp_bits = 0;
atomic_set(&io.count, 1); /* see dispatch_io() */
io.sleeper = current;
io.client = client;
@@ -397,6 +402,7 @@
io = mempool_alloc(client->pool, GFP_NOIO);
io->error_bits = 0;
+ io->eopnotsupp_bits = 0;
atomic_set(&io->count, 1); /* see dispatch_io() */
io->sleeper = NULL;
io->client = client;