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>
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@ -22,6 +22,7 @@ struct dm_io_client {
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/* FIXME: can we shrink this ? */
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struct io {
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unsigned long error_bits;
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unsigned long eopnotsupp_bits;
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atomic_t count;
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struct task_struct *sleeper;
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struct dm_io_client *client;
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@ -107,8 +108,11 @@ static inline unsigned bio_get_region(struct bio *bio)
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*---------------------------------------------------------------*/
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static void dec_count(struct io *io, unsigned int region, int error)
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{
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if (error)
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if (error) {
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set_bit(region, &io->error_bits);
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if (error == -EOPNOTSUPP)
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set_bit(region, &io->eopnotsupp_bits);
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}
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if (atomic_dec_and_test(&io->count)) {
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if (io->sleeper)
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@ -361,6 +365,7 @@ static int sync_io(struct dm_io_client *client, unsigned int num_regions,
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}
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io.error_bits = 0;
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io.eopnotsupp_bits = 0;
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atomic_set(&io.count, 1); /* see dispatch_io() */
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io.sleeper = current;
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io.client = client;
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@ -397,6 +402,7 @@ static int async_io(struct dm_io_client *client, unsigned int num_regions,
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io = mempool_alloc(client->pool, GFP_NOIO);
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io->error_bits = 0;
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io->eopnotsupp_bits = 0;
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atomic_set(&io->count, 1); /* see dispatch_io() */
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io->sleeper = NULL;
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io->client = client;
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