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[Qemu-devel] [PATCH v3 07/19] block: expect errors from bdrv_co_is_alloc
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PATCH v3 07/19] block: expect errors from bdrv_co_is_allocated |
Date: |
Thu, 25 Jul 2013 16:23:05 +0200 |
Some bdrv_is_allocated callers do not expect errors, but the fallback
in qcow2.c might make other callers trip on assertion failures or
infinite loops.
Fix the callers to always look for errors.
Cc: address@hidden
Reviewed-by: Eric Blake <address@hidden>
Signed-off-by: Paolo Bonzini <address@hidden>
---
block/qcow2.c | 4 +---
block/stream.c | 2 +-
qemu-img.c | 5 +++++
3 files changed, 7 insertions(+), 4 deletions(-)
diff --git a/block/qcow2.c b/block/qcow2.c
index 0eceefe..e2b4202 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -648,13 +648,11 @@ static int coroutine_fn
qcow2_co_is_allocated(BlockDriverState *bs,
int ret;
*pnum = nb_sectors;
- /* FIXME We can get errors here, but the bdrv_co_is_allocated interface
- * can't pass them on today */
qemu_co_mutex_lock(&s->lock);
ret = qcow2_get_cluster_offset(bs, sector_num << 9, pnum, &cluster_offset);
qemu_co_mutex_unlock(&s->lock);
if (ret < 0) {
- *pnum = 0;
+ return ret;
}
return (cluster_offset != 0) || (ret == QCOW2_CLUSTER_ZERO);
diff --git a/block/stream.c b/block/stream.c
index 60136fb..1579cd3 100644
--- a/block/stream.c
+++ b/block/stream.c
@@ -120,7 +120,7 @@ wait:
if (ret == 1) {
/* Allocated in the top, no need to copy. */
copy = false;
- } else {
+ } else if (ret >= 0) {
/* Copy if allocated in the intermediate images. Limit to the
* known-unallocated area [sector_num, sector_num+n). */
ret = bdrv_is_allocated_above(bs->backing_hd, base,
diff --git a/qemu-img.c b/qemu-img.c
index c55ca5c..a4957eb 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -2073,6 +2073,11 @@ static int img_rebase(int argc, char **argv)
/* If the cluster is allocated, we don't need to take action */
ret = bdrv_is_allocated(bs, sector, n, &n);
+ if (ret < 0) {
+ error_report("error while reading image metadata: %s",
+ strerror(-ret));
+ goto out;
+ }
if (ret) {
continue;
}
--
1.8.3.1
- Re: [Qemu-devel] [PATCH v3 04/19] block: update bs->total_sectors on writes, (continued)
- [Qemu-devel] [PATCH v3 07/19] block: expect errors from bdrv_co_is_allocated,
Paolo Bonzini <=
[Qemu-devel] [PATCH v3 09/19] block: make bdrv_has_zero_init return false for copy-on-write-images, Paolo Bonzini, 2013/07/25
[Qemu-devel] [PATCH v3 08/19] qemu-img: always probe the input image for allocated sectors, Paolo Bonzini, 2013/07/25
[Qemu-devel] [PATCH v3 10/19] block: introduce bdrv_get_block_status API, Paolo Bonzini, 2013/07/25
[Qemu-devel] [PATCH v3 12/19] block: return get_block_status data and flags for formats, Paolo Bonzini, 2013/07/25