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[Qemu-devel] [PATCH] qcow2: Fix error handling during metadata prealloca
From: |
Kevin Wolf |
Subject: |
[Qemu-devel] [PATCH] qcow2: Fix error handling during metadata preallocation |
Date: |
Tue, 22 Jun 2010 17:34:11 +0200 |
People were wondering why qemu-img check failed after they tried to preallocate
a large qcow2 file and ran out of disk space.
Signed-off-by: Kevin Wolf <address@hidden>
---
block/qcow2.c | 15 +++++++++------
1 files changed, 9 insertions(+), 6 deletions(-)
diff --git a/block/qcow2.c b/block/qcow2.c
index d29e6b6..9ee34b6 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -805,14 +805,14 @@ static int preallocate(BlockDriverState *bs)
while (nb_sectors) {
num = MIN(nb_sectors, INT_MAX >> 9);
ret = qcow2_alloc_cluster_offset(bs, offset, 0, num, &num, &meta);
-
if (ret < 0) {
- return -1;
+ return ret;
}
- if (qcow2_alloc_cluster_link_l2(bs, &meta) < 0) {
+ ret = qcow2_alloc_cluster_link_l2(bs, &meta);
+ if (ret < 0) {
qcow2_free_any_clusters(bs, meta.cluster_offset, meta.nb_clusters);
- return -1;
+ return ret;
}
/* There are no dependent requests, but we need to remove our request
@@ -833,7 +833,10 @@ static int preallocate(BlockDriverState *bs)
if (meta.cluster_offset != 0) {
uint8_t buf[512];
memset(buf, 0, 512);
- bdrv_write(bs->file, (meta.cluster_offset >> 9) + num - 1, buf, 1);
+ ret = bdrv_write(bs->file, (meta.cluster_offset >> 9) + num - 1, buf,
1);
+ if (ret < 0) {
+ return ret;
+ }
}
return 0;
@@ -1030,7 +1033,7 @@ exit:
BlockDriver *drv = bdrv_find_format("qcow2");
bs = bdrv_new("");
bdrv_open(bs, filename, BDRV_O_CACHE_WB | BDRV_O_RDWR, drv);
- preallocate(bs);
+ ret = preallocate(bs);
bdrv_close(bs);
}
--
1.6.6.1
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