Konrad Rzeszutek Wilk 29bde09378 xen/blkback: Support 'feature-barrier' aka old-style BARRIER requests. ... We emulate the barrier requests by draining the outstanding bio's and then sending the WRITE_FLUSH command. To drain the I/Os we use the refcnt that is used during disconnect to wait for all the I/Os before disconnecting from the frontend. We latch on its value and if it reaches either the threshold for disconnect or when there are no more outstanding I/Os, then we have drained all I/Os. Suggested-by: Christopher Hellwig <hch@infradead.org> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>		2011-10-13 09:48:36 -04:00
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Makefile	xen/blkback: Squash vbd.c,interface.c in blkback.c and xenbus.c respectivly.	2011-04-20 11:57:59 -04:00
blkback.c	xen/blkback: Support 'feature-barrier' aka old-style BARRIER requests.	2011-10-13 09:48:36 -04:00
common.h	xen/blkback: Support 'feature-barrier' aka old-style BARRIER requests.	2011-10-13 09:48:36 -04:00
xenbus.c	xen/blkback: Support 'feature-barrier' aka old-style BARRIER requests.	2011-10-13 09:48:36 -04:00