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qed: support for growing images 

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 <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2011-05-16 13:56:53 +01:00 committed by Kevin Wolf
parent f6a00aa150
commit 77a5a0001b
1 changed files with 21 additions and 1 deletions
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20
block/qed.c
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@ -1333,7 +1333,27 @@ static BlockDriverAIOCB *bdrv_qed_aio_flush(BlockDriverState *bs,
static int bdrv_qed_truncate(BlockDriverState *bs, int64_t offset) static int bdrv_qed_truncate(BlockDriverState *bs, int64_t offset)
{ {
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; 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) static int64_t bdrv_qed_getlength(BlockDriverState *bs)