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| author | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2011-10-10 00:47:49 -0400 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2011-10-13 09:48:38 -0400 |
| commit | 64391b2536ca92f9c589b2bfeaca3954896fe057 (patch) | |
| tree | 0712fab29f774ec1bf6e4bb851cf58228486af1d /drivers/block | |
| parent | 5c62cb48602dba95159c81ffeca179d3852e25be (diff) | |
| download | linux-64391b2536ca92f9c589b2bfeaca3954896fe057.tar.gz linux-64391b2536ca92f9c589b2bfeaca3954896fe057.tar.bz2 linux-64391b2536ca92f9c589b2bfeaca3954896fe057.zip | |
xen/blkback: Fix the inhibition to map pages when discarding sector ranges.
The 'operation' parameters are the ones provided to the bio layer while
the req->operation are the ones passed in between the backend and
frontend. We used the wrong 'operation' value to squash the
call to map pages when processing the discard operation resulting
in an hypercall that did nothing. Lets guard against going in the
mapping function by checking for the proper operation type.
CC: Li Dongyang <lidongyang@novell.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/xen-blkback/blkback.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c index c15c559e8662..53c81de6f886 100644 --- a/drivers/block/xen-blkback/blkback.c +++ b/drivers/block/xen-blkback/blkback.c @@ -707,8 +707,7 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif, * the hypercall to unmap the grants - that is all done in * xen_blkbk_unmap. */ - if (operation != BLKIF_OP_DISCARD && - xen_blkbk_map(req, pending_req, seg)) + if (operation == REQ_DISCARD && xen_blkbk_map(req, pending_req, seg)) goto fail_flush; /* |