aoe: prevent cache aliases

Prevent the AoE block driver from creating cache aliases of page cache
pages on machines with virtually indexed caches.

Building kernels on an AT91SAM9G20 board without this patch fails with
segmentation faults after a couple of passes.

Signed-off-by: Peter Horton <zero@colonel-panic.org>
Cc: "Ed L. Cashin" <ecashin@coraid.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 21 insertions, 2 deletions

diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c
index 965ece2c7e4d..13bb69d2abb3 100644
--- a/drivers/block/aoe/aoecmd.c
+++ b/drivers/block/aoe/aoecmd.c
@@ -735,6 +735,21 @@ diskstats(struct gendisk *disk, struct bio *bio, ulong duration, sector_t sector
         part_stat_unlock();
 }
 
+/*
+ * Ensure we don't create aliases in VI caches
+ */
+static inline void
+killalias(struct bio *bio)
+{
+        struct bio_vec *bv;
+        int i;
+
+        if (bio_data_dir(bio) == READ)
+                __bio_for_each_segment(bv, bio, i, 0) {
+                        flush_dcache_page(bv->bv_page);
+                }
+}
+
 void
 aoecmd_ata_rsp(struct sk_buff *skb)
 {
@@ -853,8 +868,12 @@ aoecmd_ata_rsp(struct sk_buff *skb)
 
         if (buf && --buf->nframesout == 0 && buf->resid == 0) {
                 diskstats(d->gd, buf->bio, jiffies - buf->stime, buf->sector);
-                n = (buf->flags & BUFFL_FAIL) ? -EIO : 0;
-                bio_endio(buf->bio, n);
+                if (buf->flags & BUFFL_FAIL)
+                        bio_endio(buf->bio, -EIO);
+                else {
+                        killalias(buf->bio);
+                        bio_endio(buf->bio, 0);
+                }
                 mempool_free(buf, d->bufpool);
         }