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[Qemu-devel] [PATCH v17 07/14] block: Parse "backing" option to referenc
From: |
Fam Zheng |
Subject: |
[Qemu-devel] [PATCH v17 07/14] block: Parse "backing" option to reference existing BDS |
Date: |
Mon, 10 Mar 2014 15:26:03 +0800 |
Now it's safe to allow reference for backing_hd in the interface.
Signed-off-by: Fam Zheng <address@hidden>
---
block.c | 27 +++++++++++++++++++++++++--
1 file changed, 25 insertions(+), 2 deletions(-)
diff --git a/block.c b/block.c
index 95247c8..05f7766 100644
--- a/block.c
+++ b/block.c
@@ -1401,12 +1401,35 @@ int bdrv_open(BlockDriverState **pbs, const char
*filename,
/* If there is a backing file, use it */
if ((flags & BDRV_O_NO_BACKING) == 0) {
QDict *backing_options;
+ const char *backing_name;
+ BlockDriverState *backing_hd;
+ backing_name = qdict_get_try_str(options, "backing");
qdict_extract_subqdict(options, &backing_options, "backing.");
- ret = bdrv_open_backing_file(bs, backing_options, &local_err);
- if (ret < 0) {
+
+ if (backing_name && qdict_size(backing_options)) {
+ error_setg(&local_err,
+ "Option \"backing\" and \"backing.*\" cannot be "
+ "used together");
+ ret = -EINVAL;
goto close_and_fail;
}
+ if (backing_name) {
+ backing_hd = bdrv_find(backing_name);
+ if (!backing_hd) {
+ error_set(&local_err, QERR_DEVICE_NOT_FOUND, backing_name);
+ ret = -ENOENT;
+ goto close_and_fail;
+ }
+ qdict_del(options, "backing");
+ bdrv_set_backing_hd(bs, backing_hd);
+ bdrv_ref(backing_hd);
+ } else {
+ ret = bdrv_open_backing_file(bs, backing_options, &local_err);
+ if (ret < 0) {
+ goto close_and_fail;
+ }
+ }
}
done:
--
1.9.0
- [Qemu-devel] [PATCH v17 00/14] Drop in_use from BlockDriverState and enable point-in-time snapshot exporting over NBD, Fam Zheng, 2014/03/10
- [Qemu-devel] [PATCH v17 01/14] block: Add BlockOpType enum, Fam Zheng, 2014/03/10
- [Qemu-devel] [PATCH v17 02/14] block: Introduce op_blockers to BlockDriverState, Fam Zheng, 2014/03/10
- [Qemu-devel] [PATCH v17 03/14] block: Replace in_use with operation blocker, Fam Zheng, 2014/03/10
- [Qemu-devel] [PATCH v17 04/14] block: Move op_blocker check from block_job_create to its caller, Fam Zheng, 2014/03/10
- [Qemu-devel] [PATCH v17 05/14] block: Add bdrv_set_backing_hd(), Fam Zheng, 2014/03/10
- [Qemu-devel] [PATCH v17 06/14] block: Add backing_blocker in BlockDriverState, Fam Zheng, 2014/03/10
- [Qemu-devel] [PATCH v17 07/14] block: Parse "backing" option to reference existing BDS,
Fam Zheng <=
- [Qemu-devel] [PATCH v17 08/14] block: Support dropping active in bdrv_drop_intermediate, Fam Zheng, 2014/03/10
- [Qemu-devel] [PATCH v17 09/14] stream: Use bdrv_drop_intermediate and drop close_unused_images, Fam Zheng, 2014/03/10
- [Qemu-devel] [PATCH v17 10/14] qmp: Add command 'blockdev-backup', Fam Zheng, 2014/03/10
- [Qemu-devel] [PATCH v17 11/14] block: Allow backup on referenced named BlockDriverState, Fam Zheng, 2014/03/10
- [Qemu-devel] [PATCH v17 12/14] block: Add blockdev-backup to transaction, Fam Zheng, 2014/03/10
- [Qemu-devel] [PATCH v17 13/14] qemu-iotests: Test blockdev-backup in 055, Fam Zheng, 2014/03/10
- [Qemu-devel] [PATCH v17 14/14] qemu-iotests: Image fleecing test case 083, Fam Zheng, 2014/03/10