On Fri, 2014-02-28 at 17:10 -0800, gregkh@xxxxxxxxxxxxxxxxxxx wrote:
> The patch below does not apply to the 3.13-stable tree.
> If someone wants it applied there, or to any other stable or longterm
> tree, then please email the backport, including the original git commit
> id to <stable@xxxxxxxxxxxxxxx>.
>
> thanks,
>
> greg k-h
>
Hi Greg,
Here's the v3.10.y+ stable version minus immutable biovec changes.
Thanks!
--nab
>From 7f2c1609379b38b752d4ed781cae5e406f28b63c Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Date: Sat, 1 Mar 2014 17:00:16 -0800
Subject: [PATCH] bio-integrity: Fix bio_integrity_verify segment start bug
commit 5837c80e870bc3b12ac6a98cdc9ce7a9522a8fb6 upstream.
This patch addresses a bug in bio_integrity_verify() code that has
been causing DIF READ verify operations to be silently skipped.
The issue is that bio->bi_idx will have been incremented within
bio_advance() code in the normal blk_update_request() ->
req_bio_endio() completion path, and bio_integrity_verify() is
using bio_for_each_segment() which starts the bio segment walk
at the current bio->bi_idx.
So instead use bio_for_each_segment_all() to always start the bio
segment walk from zero, regardless of the current bio->bi_idx
value after bio_advance() has been called.
(Context change for v3.10.y -> v3.13.y code - nab)
Cc: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxx # >= v3.10
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
---
fs/bio-integrity.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/bio-integrity.c b/fs/bio-integrity.c
index 6dea2b9..76273c1 100644
--- a/fs/bio-integrity.c
+++ b/fs/bio-integrity.c
@@ -458,7 +458,7 @@ static int bio_integrity_verify(struct bio *bio)
bix.disk_name = bio->bi_bdev->bd_disk->disk_name;
bix.sector_size = bi->sector_size;
- bio_for_each_segment(bv, bio, i) {
+ bio_for_each_segment_all(bv, bio, i) {
void *kaddr = kmap_atomic(bv->bv_page);
bix.data_buf = kaddr + bv->bv_offset;
bix.data_size = bv->bv_len;
--
1.8.5.3
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