xen-blkback: safely unmap grants in case they are still in use

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Use gnttab_unmap_refs_async() to wait until the mapped pages are no
longer in use before unmapping them.

This allows blkback to use network storage which may retain refs to
pages in queued skbs after the block I/O has completed.

Signed-off-by: Jennifer Herbert <jennifer.herbert@citrix.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Acked-by: Jens Axboe <axboe@kernel.de>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>

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Jennifer Herbert 2015-01-05 16:49:22 +00:00 • committed by David Vrabel

parent 745282256c

commit c43cf3ea83

2 changed files with 122 additions and 50 deletions

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169

drivers/block/xen-blkback/blkback.c

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3

drivers/block/xen-blkback/common.h

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