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authorLuiz Capitulino <lcapitulino@redhat.com>2011-11-25 16:15:19 -0200
committerLuiz Capitulino <lcapitulino@redhat.com>2011-12-06 11:40:01 -0200
commit6106e2492fe0080ad85d4862dec9c3bebc57b2f0 (patch)
tree8ebe7e833fdbf1cd3d2caffccbee2cd420fcfa1e /blockdev.c
parent5e7caacb2583e6a4657fec51a92147f33c5bae43 (diff)
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qapi: Convert blockdev_snapshot_sync
Unfortunately, this conversion required an additional change. In the old QMP command, the 'snapshot-file' argument is specified as optional. The idea is to take the snapshot internally if 'snapshot-file' is not passed. However, internal snapshots are not supported yet so the command returns a MissingParamater error if 'snapshot-file' is not passed. Which makes the argument actually required and will cause compatibility breakage if we change that in the future. To fix this the QAPI converted blockdev_snapshot_sync command makes the 'snapshot-file' argument required. Again, in practice it's actually required, so this is not incompatible. If we do implement internal snapshots someday, we'll need a new argument for it. Note that this discussion doesn't affect HMP. Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Diffstat (limited to 'blockdev.c')
-rw-r--r--blockdev.c49
1 files changed, 17 insertions, 32 deletions
diff --git a/blockdev.c b/blockdev.c
index 5270404..c832782 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -601,28 +601,20 @@ void do_commit(Monitor *mon, const QDict *qdict)
}
}
-int do_snapshot_blkdev(Monitor *mon, const QDict *qdict, QObject **ret_data)
+void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file,
+ bool has_format, const char *format,
+ Error **errp)
{
- const char *device = qdict_get_str(qdict, "device");
- const char *filename = qdict_get_try_str(qdict, "snapshot-file");
- const char *format = qdict_get_try_str(qdict, "format");
BlockDriverState *bs;
BlockDriver *drv, *old_drv, *proto_drv;
int ret = 0;
int flags;
char old_filename[1024];
- if (!filename) {
- qerror_report(QERR_MISSING_PARAMETER, "snapshot-file");
- ret = -1;
- goto out;
- }
-
bs = bdrv_find(device);
if (!bs) {
- qerror_report(QERR_DEVICE_NOT_FOUND, device);
- ret = -1;
- goto out;
+ error_set(errp, QERR_DEVICE_NOT_FOUND, device);
+ return;
}
pstrcpy(old_filename, sizeof(old_filename), bs->filename);
@@ -630,35 +622,34 @@ int do_snapshot_blkdev(Monitor *mon, const QDict *qdict, QObject **ret_data)
old_drv = bs->drv;
flags = bs->open_flags;
- if (!format) {
+ if (!has_format) {
format = "qcow2";
}
drv = bdrv_find_format(format);
if (!drv) {
- qerror_report(QERR_INVALID_BLOCK_FORMAT, format);
- ret = -1;
- goto out;
+ error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
+ return;
}
- proto_drv = bdrv_find_protocol(filename);
+ proto_drv = bdrv_find_protocol(snapshot_file);
if (!proto_drv) {
- qerror_report(QERR_INVALID_BLOCK_FORMAT, format);
- ret = -1;
- goto out;
+ error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
+ return;
}
- ret = bdrv_img_create(filename, format, bs->filename,
+ ret = bdrv_img_create(snapshot_file, format, bs->filename,
bs->drv->format_name, NULL, -1, flags);
if (ret) {
- goto out;
+ error_set(errp, QERR_UNDEFINED_ERROR);
+ return;
}
bdrv_drain_all();
bdrv_flush(bs);
bdrv_close(bs);
- ret = bdrv_open(bs, filename, flags, drv);
+ ret = bdrv_open(bs, snapshot_file, flags, drv);
/*
* If reopening the image file we just created fails, fall back
* and try to re-open the original image. If that fails too, we
@@ -667,17 +658,11 @@ int do_snapshot_blkdev(Monitor *mon, const QDict *qdict, QObject **ret_data)
if (ret != 0) {
ret = bdrv_open(bs, old_filename, flags, old_drv);
if (ret != 0) {
- qerror_report(QERR_OPEN_FILE_FAILED, old_filename);
+ error_set(errp, QERR_OPEN_FILE_FAILED, old_filename);
} else {
- qerror_report(QERR_OPEN_FILE_FAILED, filename);
+ error_set(errp, QERR_OPEN_FILE_FAILED, snapshot_file);
}
}
-out:
- if (ret) {
- ret = -1;
- }
-
- return ret;
}
static int eject_device(Monitor *mon, BlockDriverState *bs, int force)