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authorAlasdair G Kergon <agk@redhat.com>2008-07-03 09:53:43 +0200
committerJens Axboe <jens.axboe@oracle.com>2008-07-03 13:21:15 +0200
commitcc371e66e340f35eed8dc4651c7c18e754c7fb26 (patch)
tree5a2d6727eb07a05999c531a90da43ab1c36b713e /block
parentb24498d477a14680fc3bb3ad884fa9fa76a2d237 (diff)
downloadconfigs-cc371e66e340f35eed8dc4651c7c18e754c7fb26.tar.gz
Add bvec_merge_data to handle stacked devices and ->merge_bvec()
When devices are stacked, one device's merge_bvec_fn may need to perform the mapping and then call one or more functions for its underlying devices. The following bio fields are used: bio->bi_sector bio->bi_bdev bio->bi_size bio->bi_rw using bio_data_dir() This patch creates a new struct bvec_merge_data holding a copy of those fields to avoid having to change them directly in the struct bio when going down the stack only to have to change them back again on the way back up. (And then when the bio gets mapped for real, the whole exercise gets repeated, but that's a problem for another day...) Signed-off-by: Alasdair G Kergon <agk@redhat.com> Cc: Neil Brown <neilb@suse.de> Cc: Milan Broz <mbroz@redhat.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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