dm: don't return errnos from ->map
Instead use the special DM_MAPIO_KILL return value to return -EIO just like we do for the request based path. Note that dm-log-writes returned -ENOMEM in a few places, which now becomes -EIO instead. No consumer treats -ENOMEM special so this shouldn't be an issue (and it should use a mempool to start with to make guaranteed progress). Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
parent
14ef1e4826
commit
846785e6a5
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@ -2795,10 +2795,10 @@ static int crypt_map(struct dm_target *ti, struct bio *bio)
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* and is aligned to this size as defined in IO hints.
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*/
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if (unlikely((bio->bi_iter.bi_sector & ((cc->sector_size >> SECTOR_SHIFT) - 1)) != 0))
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return -EIO;
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return DM_MAPIO_KILL;
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if (unlikely(bio->bi_iter.bi_size & (cc->sector_size - 1)))
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return -EIO;
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return DM_MAPIO_KILL;
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io = dm_per_bio_data(bio, cc->per_bio_data_size);
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crypt_io_init(io, cc, bio, dm_target_offset(ti, bio->bi_iter.bi_sector));
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@ -321,7 +321,7 @@ static int flakey_map(struct dm_target *ti, struct bio *bio)
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if (bio_data_dir(bio) == READ) {
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if (!fc->corrupt_bio_byte && !test_bit(DROP_WRITES, &fc->flags) &&
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!test_bit(ERROR_WRITES, &fc->flags))
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return -EIO;
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return DM_MAPIO_KILL;
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goto map_bio;
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}
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@ -349,7 +349,7 @@ static int flakey_map(struct dm_target *ti, struct bio *bio)
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/*
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* By default, error all I/O.
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*/
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return -EIO;
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return DM_MAPIO_KILL;
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}
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map_bio:
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@ -1352,13 +1352,13 @@ static int dm_integrity_map(struct dm_target *ti, struct bio *bio)
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DMERR("Too big sector number: 0x%llx + 0x%x > 0x%llx",
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(unsigned long long)dio->range.logical_sector, bio_sectors(bio),
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(unsigned long long)ic->provided_data_sectors);
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return -EIO;
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return DM_MAPIO_KILL;
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}
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if (unlikely((dio->range.logical_sector | bio_sectors(bio)) & (unsigned)(ic->sectors_per_block - 1))) {
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DMERR("Bio not aligned on %u sectors: 0x%llx, 0x%x",
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ic->sectors_per_block,
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(unsigned long long)dio->range.logical_sector, bio_sectors(bio));
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return -EIO;
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return DM_MAPIO_KILL;
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}
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if (ic->sectors_per_block > 1) {
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@ -1368,7 +1368,7 @@ static int dm_integrity_map(struct dm_target *ti, struct bio *bio)
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if (unlikely((bv.bv_offset | bv.bv_len) & ((ic->sectors_per_block << SECTOR_SHIFT) - 1))) {
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DMERR("Bio vector (%u,%u) is not aligned on %u-sector boundary",
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bv.bv_offset, bv.bv_len, ic->sectors_per_block);
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return -EIO;
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return DM_MAPIO_KILL;
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}
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}
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}
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@ -1383,18 +1383,18 @@ static int dm_integrity_map(struct dm_target *ti, struct bio *bio)
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wanted_tag_size *= ic->tag_size;
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if (unlikely(wanted_tag_size != bip->bip_iter.bi_size)) {
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DMERR("Invalid integrity data size %u, expected %u", bip->bip_iter.bi_size, wanted_tag_size);
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return -EIO;
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return DM_MAPIO_KILL;
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}
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}
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} else {
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if (unlikely(bip != NULL)) {
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DMERR("Unexpected integrity data when using internal hash");
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return -EIO;
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return DM_MAPIO_KILL;
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}
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}
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if (unlikely(ic->mode == 'R') && unlikely(dio->write))
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return -EIO;
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return DM_MAPIO_KILL;
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get_area_and_offset(ic, dio->range.logical_sector, &area, &offset);
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dio->metadata_block = get_metadata_sector_and_offset(ic, area, offset, &dio->metadata_offset);
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@ -586,7 +586,7 @@ static int log_writes_map(struct dm_target *ti, struct bio *bio)
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spin_lock_irq(&lc->blocks_lock);
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lc->logging_enabled = false;
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spin_unlock_irq(&lc->blocks_lock);
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return -ENOMEM;
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return DM_MAPIO_KILL;
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}
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INIT_LIST_HEAD(&block->list);
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pb->block = block;
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@ -639,7 +639,7 @@ static int log_writes_map(struct dm_target *ti, struct bio *bio)
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spin_lock_irq(&lc->blocks_lock);
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lc->logging_enabled = false;
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spin_unlock_irq(&lc->blocks_lock);
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return -ENOMEM;
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return DM_MAPIO_KILL;
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}
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src = kmap_atomic(bv.bv_page);
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@ -559,7 +559,7 @@ static int __multipath_map_bio(struct multipath *m, struct bio *bio, struct dm_m
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if (test_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags))
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return DM_MAPIO_REQUEUE;
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dm_report_EIO(m);
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return -EIO;
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return DM_MAPIO_KILL;
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}
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mpio->pgpath = pgpath;
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@ -621,11 +621,18 @@ static void process_queued_bios(struct work_struct *work)
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blk_start_plug(&plug);
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while ((bio = bio_list_pop(&bios))) {
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r = __multipath_map_bio(m, bio, get_mpio_from_bio(bio));
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if (r < 0 || r == DM_MAPIO_REQUEUE) {
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switch (r) {
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case DM_MAPIO_KILL:
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r = -EIO;
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/*FALLTHRU*/
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case DM_MAPIO_REQUEUE:
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bio->bi_error = r;
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bio_endio(bio);
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} else if (r == DM_MAPIO_REMAPPED)
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break;
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case DM_MAPIO_REMAPPED:
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generic_make_request(bio);
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break;
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}
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}
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blk_finish_plug(&plug);
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}
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@ -1207,14 +1207,14 @@ static int mirror_map(struct dm_target *ti, struct bio *bio)
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r = log->type->in_sync(log, dm_rh_bio_to_region(ms->rh, bio), 0);
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if (r < 0 && r != -EWOULDBLOCK)
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return r;
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return DM_MAPIO_KILL;
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/*
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* If region is not in-sync queue the bio.
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*/
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if (!r || (r == -EWOULDBLOCK)) {
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if (bio->bi_opf & REQ_RAHEAD)
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return -EIO;
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return DM_MAPIO_KILL;
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queue_bio(ms, bio, rw);
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return DM_MAPIO_SUBMITTED;
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@ -1226,7 +1226,7 @@ static int mirror_map(struct dm_target *ti, struct bio *bio)
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*/
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m = choose_mirror(ms, bio->bi_iter.bi_sector);
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if (unlikely(!m))
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return -EIO;
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return DM_MAPIO_KILL;
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dm_bio_record(&bio_record->details, bio);
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bio_record->m = m;
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@ -1690,7 +1690,7 @@ static int snapshot_map(struct dm_target *ti, struct bio *bio)
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/* Full snapshots are not usable */
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/* To get here the table must be live so s->active is always set. */
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if (!s->valid)
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return -EIO;
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return DM_MAPIO_KILL;
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/* FIXME: should only take write lock if we need
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* to copy an exception */
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@ -1698,7 +1698,7 @@ static int snapshot_map(struct dm_target *ti, struct bio *bio)
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if (!s->valid || (unlikely(s->snapshot_overflowed) &&
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bio_data_dir(bio) == WRITE)) {
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r = -EIO;
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r = DM_MAPIO_KILL;
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goto out_unlock;
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}
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@ -1723,7 +1723,7 @@ static int snapshot_map(struct dm_target *ti, struct bio *bio)
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if (!s->valid || s->snapshot_overflowed) {
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free_pending_exception(pe);
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r = -EIO;
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r = DM_MAPIO_KILL;
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goto out_unlock;
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}
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@ -1741,7 +1741,7 @@ static int snapshot_map(struct dm_target *ti, struct bio *bio)
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DMERR("Snapshot overflowed: Unable to allocate exception.");
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} else
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__invalidate_snapshot(s, -ENOMEM);
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r = -EIO;
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r = DM_MAPIO_KILL;
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goto out_unlock;
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}
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}
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@ -128,7 +128,7 @@ static void io_err_dtr(struct dm_target *tt)
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static int io_err_map(struct dm_target *tt, struct bio *bio)
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{
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return -EIO;
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return DM_MAPIO_KILL;
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}
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static int io_err_clone_and_map_rq(struct dm_target *ti, struct request *rq,
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@ -643,17 +643,17 @@ static int verity_map(struct dm_target *ti, struct bio *bio)
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if (((unsigned)bio->bi_iter.bi_sector | bio_sectors(bio)) &
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((1 << (v->data_dev_block_bits - SECTOR_SHIFT)) - 1)) {
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DMERR_LIMIT("unaligned io");
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return -EIO;
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return DM_MAPIO_KILL;
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}
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if (bio_end_sector(bio) >>
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(v->data_dev_block_bits - SECTOR_SHIFT) > v->data_blocks) {
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DMERR_LIMIT("io out of range");
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return -EIO;
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return DM_MAPIO_KILL;
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}
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if (bio_data_dir(bio) == WRITE)
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return -EIO;
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return DM_MAPIO_KILL;
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io = dm_per_bio_data(bio, ti->per_io_data_size);
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io->v = v;
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@ -39,7 +39,7 @@ static int zero_map(struct dm_target *ti, struct bio *bio)
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case REQ_OP_READ:
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if (bio->bi_opf & REQ_RAHEAD) {
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/* readahead of null bytes only wastes buffer cache */
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return -EIO;
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return DM_MAPIO_KILL;
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}
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zero_fill_bio(bio);
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break;
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@ -47,7 +47,7 @@ static int zero_map(struct dm_target *ti, struct bio *bio)
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/* writes get silently dropped */
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break;
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default:
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return -EIO;
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return DM_MAPIO_KILL;
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}
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bio_endio(bio);
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@ -1084,18 +1084,24 @@ static void __map_bio(struct dm_target_io *tio)
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r = ti->type->map(ti, clone);
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dm_offload_end(&o);
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if (r == DM_MAPIO_REMAPPED) {
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switch (r) {
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case DM_MAPIO_SUBMITTED:
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break;
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case DM_MAPIO_REMAPPED:
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/* the bio has been remapped so dispatch it */
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trace_block_bio_remap(bdev_get_queue(clone->bi_bdev), clone,
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tio->io->bio->bi_bdev->bd_dev, sector);
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generic_make_request(clone);
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} else if (r < 0 || r == DM_MAPIO_REQUEUE) {
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break;
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case DM_MAPIO_KILL:
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r = -EIO;
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/*FALLTHRU*/
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case DM_MAPIO_REQUEUE:
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/* error the io and bail out, or requeue it if needed */
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dec_pending(tio->io, r);
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free_tio(tio);
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} else if (r != DM_MAPIO_SUBMITTED) {
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break;
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default:
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DMWARN("unimplemented target map return value: %d", r);
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BUG();
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}
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