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| author | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2011-10-10 00:42:22 -0400 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2011-10-13 09:48:36 -0400 |
| commit | 29bde093787f3bdf7b9b4270ada6be7c8076e36b (patch) | |
| tree | 4fff697e0acb2471b1bd575cbd006fa4efc3937d /block/blk-cgroup.c | |
| parent | 469738e675524b6aa029ecd46bdda3f878b12eff (diff) | |
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>
Diffstat (limited to 'block/blk-cgroup.c')
0 files changed, 0 insertions, 0 deletions