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| author | Roger Pau Monne <roger.pau@citrix.com> | 2012-11-02 16:43:04 +0100 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2012-11-04 16:35:40 +0100 |
| commit | cb5bd4d19b46c220b1ac8462a3da01767dd99488 (patch) | |
| tree | 1b22151771a90480d0d4790521b9432f46f1e32a /drivers/block/xen-blkfront.c | |
| parent | xen/blkback: Persistent grant maps for xen blk drivers (diff) | |
| download | linux-cb5bd4d19b46c220b1ac8462a3da01767dd99488.tar.xz linux-cb5bd4d19b46c220b1ac8462a3da01767dd99488.zip | |
xen/blkback: persistent-grants fixes
This patch contains fixes for persistent grants implementation v2:
* handle == 0 is a valid handle, so initialize grants in blkback
setting the handle to BLKBACK_INVALID_HANDLE instead of 0. Reported
by Konrad Rzeszutek Wilk.
* new_map is a boolean, use "true" or "false" instead of 1 and 0.
Reported by Konrad Rzeszutek Wilk.
* blkfront announces the persistent-grants feature as
feature-persistent-grants, use feature-persistent instead which is
consistent with blkback and the public Xen headers.
* Add a consistency check in blkfront to make sure we don't try to
access segments that have not been set.
Reported-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Roger Pau Monne <roger.pau@citrix.com>
[v1: The new_map int->bool had already been changed]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/block/xen-blkfront.c')
| -rw-r--r-- | drivers/block/xen-blkfront.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index 911d733d21b6..f1de806b0a63 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -852,6 +852,7 @@ static void blkif_completion(struct blk_shadow *s, struct blkfront_info *info, rq_for_each_segment(bvec, s->request, iter) { BUG_ON((bvec->bv_offset + bvec->bv_len) > PAGE_SIZE); i = offset >> PAGE_SHIFT; + BUG_ON(i >= s->req.u.rw.nr_segments); shared_data = kmap_atomic( pfn_to_page(s->grants_used[i]->pfn)); bvec_data = bvec_kmap_irq(bvec, &flags); @@ -1069,7 +1070,7 @@ again: goto abort_transaction; } err = xenbus_printf(xbt, dev->nodename, - "feature-persistent-grants", "%u", 1); + "feature-persistent", "%u", 1); if (err) dev_warn(&dev->dev, "writing persistent grants feature to xenbus"); |