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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>
This commit is contained in:
Mikulas Patocka 2009-06-22 10:12:25 +01:00 committed by Alasdair G Kergon
parent 494b3ee7d4
commit 5af443a7e1
1 changed files with 7 additions and 1 deletions
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8
drivers/md/dm-io.c
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@ -22,6 +22,7 @@ struct dm_io_client {
/* 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 inline unsigned bio_get_region(struct bio *bio)
*---------------------------------------------------------------*/
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 @@ static int sync_io(struct dm_io_client *client, unsigned int num_regions,
}
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 @@ static int async_io(struct dm_io_client *client, unsigned int num_regions,
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;