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From 96165264ad0afe7a5d440ef49f9712a188486266 Mon Sep 17 00:00:00 2001
From: Richard Yao <ryao@gentoo.org>
Date: Fri, 18 Sep 2015 08:32:52 -0400
Subject: [PATCH] Discard on zvols should not exceed the length of a block
37f9dac592bf5889c3efb305c48ac39b4c7dd140 replaced the end-start
calculation with a cached value, but neglected to update it on discard
operations. This can cause us to discard data not requested, causing
data loss on zvols.
Reported-by: Richard Connon <richard.connon@zynstra.com>
Signed-off-by: Richard Yao <ryao@gentoo.org>
---
module/zfs/zvol.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/module/zfs/zvol.c b/module/zfs/zvol.c
index 492f8ff..c5a8071 100644
--- a/module/zfs/zvol.c
+++ b/module/zfs/zvol.c
@@ -661,6 +661,7 @@ zvol_discard(struct bio *bio)
if (!(bio->bi_rw & REQ_SECURE)) {
start = P2ROUNDUP(start, zv->zv_volblocksize);
end = P2ALIGN(end, zv->zv_volblocksize);
+ size = end - start;
}
#endif
--
2.4.6
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