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[Qemu-devel] [PATCH] block: Avoid bogus flags during mirroring
From: |
Eric Blake |
Subject: |
[Qemu-devel] [PATCH] block: Avoid bogus flags during mirroring |
Date: |
Sat, 11 Jun 2016 19:18:40 -0600 |
Commit e253f4b8 converted mirroring from sector-based bdrv_aio_*
to byte-based blk_aio_*, but failed to account for the subtle
difference in signatures (the former takes a semi-redundant length,
the latter takes a flags parameter). Since all of our flags are
currently smaller in size than BDRV_SECTOR_SIZE, it has no ill
effects until we either perform sub-sector mirroring, or we start
asserting that no unexpected flags are set. I found it while
testing new asserts when qemu-iotests 132 started warning about an
unknown flag 0x200000.
Add an assert to help us catch any other improper flags.
Signed-off-by: Eric Blake <address@hidden>
---
block/block-backend.c | 2 ++
block/mirror.c | 6 ++----
2 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/block/block-backend.c b/block/block-backend.c
index 34500e6..a5dc6e3 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -945,6 +945,8 @@ static BlockAIOCB *blk_aio_prwv(BlockBackend *blk, int64_t
offset, int bytes,
acb->bh = NULL;
acb->has_returned = false;
+ assert(flags <= 0x1f);
+
co = qemu_coroutine_create(co_entry);
qemu_coroutine_enter(co, acb);
diff --git a/block/mirror.c b/block/mirror.c
index fbbc496..41848b2 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -157,8 +157,7 @@ static void mirror_read_complete(void *opaque, int ret)
return;
}
blk_aio_pwritev(s->target, op->sector_num * BDRV_SECTOR_SIZE, &op->qiov,
- op->nb_sectors * BDRV_SECTOR_SIZE,
- mirror_write_complete, op);
+ 0, mirror_write_complete, op);
}
static inline void mirror_clip_sectors(MirrorBlockJob *s,
@@ -275,8 +274,7 @@ static int mirror_do_read(MirrorBlockJob *s, int64_t
sector_num,
s->sectors_in_flight += nb_sectors;
trace_mirror_one_iteration(s, sector_num, nb_sectors);
- blk_aio_preadv(source, sector_num * BDRV_SECTOR_SIZE, &op->qiov,
- nb_sectors * BDRV_SECTOR_SIZE,
+ blk_aio_preadv(source, sector_num * BDRV_SECTOR_SIZE, &op->qiov, 0,
mirror_read_complete, op);
return ret;
}
--
2.5.5
- [Qemu-devel] [PATCH] block: Avoid bogus flags during mirroring,
Eric Blake <=