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[PATCH 05/97] qcow2: Fix qcow2_make_empty() with external data file
From: |
Michael Roth |
Subject: |
[PATCH 05/97] qcow2: Fix qcow2_make_empty() with external data file |
Date: |
Tue, 1 Oct 2019 18:44:44 -0500 |
From: Kevin Wolf <address@hidden>
make_completely_empty() is an optimisated path for bdrv_make_empty()
where completely new metadata is created inside the image file instead
of going through all clusters and discarding them. For an external data
file, however, we actually need to do discard operations on the data
file; just overwriting the qcow2 file doesn't get rid of the data.
The necessary slow path with an explicit discard operation already
exists for other cases. Use it for external data files, too.
Cc: address@hidden
Signed-off-by: Kevin Wolf <address@hidden>
Reviewed-by: Eric Blake <address@hidden>
(cherry picked from commit db04524f820582ebf1189223b6378de238511da1)
Signed-off-by: Michael Roth <address@hidden>
---
block/qcow2.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/block/qcow2.c b/block/qcow2.c
index 7fbef97aab..840f289a48 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -4384,14 +4384,17 @@ static int qcow2_make_empty(BlockDriverState *bs)
if (s->qcow_version >= 3 && !s->snapshots && !s->nb_bitmaps &&
3 + l1_clusters <= s->refcount_block_size &&
- s->crypt_method_header != QCOW_CRYPT_LUKS) {
+ s->crypt_method_header != QCOW_CRYPT_LUKS &&
+ !has_data_file(bs)) {
/* The following function only works for qcow2 v3 images (it
* requires the dirty flag) and only as long as there are no
* features that reserve extra clusters (such as snapshots,
* LUKS header, or persistent bitmaps), because it completely
* empties the image. Furthermore, the L1 table and three
* additional clusters (image header, refcount table, one
- * refcount block) have to fit inside one refcount block. */
+ * refcount block) have to fit inside one refcount block. It
+ * only resets the image file, i.e. does not work with an
+ * external data file. */
return make_completely_empty(bs);
}
--
2.17.1
- [PATCH 47/97] virtio-balloon: Fix wrong sign extension of PFNs, (continued)
- [PATCH 47/97] virtio-balloon: Fix wrong sign extension of PFNs, Michael Roth, 2019/10/01
- [PATCH 57/97] tpm_emulator: Translate TPM error codes to strings, Michael Roth, 2019/10/01
- [PATCH 48/97] virtio-balloon: Fix QEMU crashes on pagesize > BALLOON_PAGE_SIZE, Michael Roth, 2019/10/01
- [PATCH 41/97] docs/bitmaps: use QMP lexer instead of json, Michael Roth, 2019/10/01
- [PATCH 53/97] virtio-balloon: don't track subpages for the PBP, Michael Roth, 2019/10/01
- [PATCH 50/97] virtio-balloon: Better names for offset variables in inflate/deflate code, Michael Roth, 2019/10/01
- [PATCH 55/97] i386/acpi: fix gint overflow in crs_range_compare, Michael Roth, 2019/10/01
- [PATCH 45/97] ioapic: kvm: Skip route updates for masked pins, Michael Roth, 2019/10/01
- [PATCH 03/97] qcow2: Fix full preallocation with external data file, Michael Roth, 2019/10/01
- [PATCH 36/97] virtio-pci: fix missing device properties, Michael Roth, 2019/10/01
- [PATCH 05/97] qcow2: Fix qcow2_make_empty() with external data file,
Michael Roth <=
- [PATCH 74/97] xen-bus: Fix backend state transition on device reset, Michael Roth, 2019/10/01
- [PATCH 70/97] Revert "ide/ahci: Check for -ECANCELED in aio callbacks", Michael Roth, 2019/10/01
- [PATCH 93/97] slirp: Fix heap overflow in ip_reass on big packet input, Michael Roth, 2019/10/01
- [PATCH 78/97] iotests: Add supported protocols to execute_test(), Michael Roth, 2019/10/01
- [PATCH 52/97] virtio-balloon: Use temporary PBP only, Michael Roth, 2019/10/01
- [PATCH 54/97] virtio-balloon: free pbp more aggressively, Michael Roth, 2019/10/01
- [PATCH 73/97] target/arm: Don't abort on M-profile exception return in linux-user mode, Michael Roth, 2019/10/01
- [PATCH 94/97] slirp: ip_reass: Fix use after free, Michael Roth, 2019/10/01
- [PATCH 83/97] block/create: Do not abort if a block driver is not available, Michael Roth, 2019/10/01
- [PATCH 17/97] block: Drain source node in bdrv_replace_node(), Michael Roth, 2019/10/01