The patch titled
aoe: prevent cache aliases
has been removed from the -mm tree. Its filename was
aoe-prevent-cache-aliases.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: aoe: prevent cache aliases
From: Peter Horton <phorton@xxxxxxxxxxxx>
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@xxxxxxxxxxxxxxxxx>
Cc: "Ed L. Cashin" <ecashin@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/block/aoe/aoecmd.c | 23 +++++++++++++++++++++--
1 file changed, 21 insertions(+), 2 deletions(-)
diff -puN drivers/block/aoe/aoecmd.c~aoe-prevent-cache-aliases drivers/block/aoe/aoecmd.c
--- a/drivers/block/aoe/aoecmd.c~aoe-prevent-cache-aliases
+++ a/drivers/block/aoe/aoecmd.c
@@ -735,6 +735,21 @@ diskstats(struct gendisk *disk, struct b
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);
}
_
Patches currently in -mm which might be from phorton@xxxxxxxxxxxx are
linux-next.patch
aoe-switch-to-the-new-bio_flush_dcache_pages-interface.patch
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