Neither zero_bio_chain() nor zero_pages() contains a call to flush
caches after zeroing a portion of a page. This can cause problems
on architectures that have caches that allow virtual address
aliasing.
This resolves:
http://tracker.ceph.com/issues/4777
Signed-off-by: Alex Elder <elder@xxxxxxxxxxx>
---
drivers/block/rbd.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 6e377a0..f860dd6 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -1124,6 +1124,7 @@ static void zero_bio_chain(struct bio *chain, int
start_ofs)
buf = bvec_kmap_irq(bv, &flags);
memset(buf + remainder, 0,
bv->bv_len - remainder);
+ flush_dcache_page(bv->bv_page);
bvec_kunmap_irq(buf, &flags);
}
pos += bv->bv_len;
@@ -1156,6 +1157,7 @@ static void zero_pages(struct page **pages, u64
offset, u64 end)
local_irq_save(flags);
kaddr = kmap_atomic(*page);
memset(kaddr + page_offset, 0, length);
+ flush_dcache_page(*page);
kunmap_atomic(kaddr);
local_irq_restore(flags);
--
1.7.9.5
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