[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [RFC v2 2/8] raw-format: add bdrv_measure() support
From: |
Stefan Hajnoczi |
Subject: |
[Qemu-devel] [RFC v2 2/8] raw-format: add bdrv_measure() support |
Date: |
Wed, 15 Mar 2017 17:29:34 +0800 |
Maximum size calculation is trivial for the raw format: it's just the
requested image size (because there is no metadata).
Signed-off-by: Stefan Hajnoczi <address@hidden>
---
block/raw-format.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/block/raw-format.c b/block/raw-format.c
index 86fbc65..cc88540 100644
--- a/block/raw-format.c
+++ b/block/raw-format.c
@@ -312,6 +312,27 @@ static int64_t raw_getlength(BlockDriverState *bs)
return s->size;
}
+static void raw_measure(QemuOpts *opts, BlockDriverState *in_bs,
+ BlockMeasureInfo *info,
+ Error **errp)
+{
+ if (in_bs) {
+ int64_t ssize = bdrv_getlength(in_bs);
+ if (ssize < 0) {
+ error_setg_errno(errp, -ssize, "Unable to get image size");
+ return;
+ }
+ info->required_bytes = ssize;
+ } else {
+ info->required_bytes =
+ ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
+ BDRV_SECTOR_SIZE);
+ }
+
+ /* Unallocated sectors count towards the file size in raw images */
+ info->fully_allocated_bytes = info->required_bytes;
+}
+
static int raw_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
{
return bdrv_get_info(bs->file->bs, bdi);
@@ -477,6 +498,7 @@ BlockDriver bdrv_raw = {
.bdrv_truncate = &raw_truncate,
.bdrv_getlength = &raw_getlength,
.has_variable_length = true,
+ .bdrv_measure = &raw_measure,
.bdrv_get_info = &raw_get_info,
.bdrv_refresh_limits = &raw_refresh_limits,
.bdrv_probe_blocksizes = &raw_probe_blocksizes,
--
2.9.3