sleeping in block device driver

["Bahadir Balban" <bahadir.balban@xxxxxxxxx>]

Hi,

In linux device drivers 3, block drivers chapter, for block device io
tranfers, a function is defined:

int sbull_transfer_bio(struct sbull_dev *dev, struct bio *bio)
{
  ...
  bio_for_each_segment(bvec, bio, i) {
     ...
     __bio_kmap_atomic(...);
     sbull_transfer(...);
     __bio_kunmap_atomic(...);
     ...
   }
}


Here, the transfer is not done in process context, and
sbull_transfer() cannot sleep. How could I implement a sleeping
transfer?

char drivers can sleep and receive data fetched in an irq context, can
I not do this for block drivers?

Many thanks,
Bahadir

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