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aoe: prevent cache aliases

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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>
This commit is contained in:
Peter Horton 2009-12-01 13:17:46 -08:00 committed by Linus Torvalds
parent ca0297015d
commit 0a1f127a05
1 changed files with 21 additions and 2 deletions
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23
drivers/block/aoe/aoecmd.c
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@ -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);
}