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[Qemu-devel] [PATCH] qed: support for growing images
From: |
Stefan Hajnoczi |
Subject: |
[Qemu-devel] [PATCH] qed: support for growing images |
Date: |
Mon, 16 May 2011 13:56:53 +0100 |
The .bdrv_truncate() operation resizes images and growing is easy to
implement in QED. Simply check that the new size is valid and then
update the image_size header field to reflect the new size.
Signed-off-by: Stefan Hajnoczi <address@hidden>
---
block/qed.c | 22 +++++++++++++++++++++-
1 files changed, 21 insertions(+), 1 deletions(-)
diff --git a/block/qed.c b/block/qed.c
index c8c5930..bfb49d9 100644
--- a/block/qed.c
+++ b/block/qed.c
@@ -1233,7 +1233,27 @@ static BlockDriverAIOCB
*bdrv_qed_aio_flush(BlockDriverState *bs,
static int bdrv_qed_truncate(BlockDriverState *bs, int64_t offset)
{
- return -ENOTSUP;
+ BDRVQEDState *s = bs->opaque;
+ uint64_t old_image_size;
+ int ret;
+
+ if (!qed_is_image_size_valid(offset, s->header.cluster_size,
+ s->header.table_size)) {
+ return -EINVAL;
+ }
+
+ /* Shrinking is currently not supported */
+ if ((uint64_t)offset < s->header.image_size) {
+ return -ENOTSUP;
+ }
+
+ old_image_size = s->header.image_size;
+ s->header.image_size = offset;
+ ret = qed_write_header_sync(s);
+ if (ret < 0) {
+ s->header.image_size = old_image_size;
+ }
+ return ret;
}
static int64_t bdrv_qed_getlength(BlockDriverState *bs)
--
1.7.4.4
- [Qemu-devel] [PATCH] qed: support for growing images,
Stefan Hajnoczi <=