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| author | Jeff Cody <jcody@redhat.com> | 2014-06-30 15:14:15 +0200 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2014-07-01 10:15:33 +0200 |
| commit | 7676e2c597000eff3a7233b40cca768b358f9bc9 (patch) | |
| tree | e02d1a413a6d4db0333f9dadd74ad2d9ac9aeea3 /blockdev.c | |
| parent | c891e3bbc5bc3d74ad0ba896852a9796ceb147c2 (diff) | |
| download | qemu-7676e2c597000eff3a7233b40cca768b358f9bc9.tar.gz qemu-7676e2c597000eff3a7233b40cca768b358f9bc9.tar.bz2 qemu-7676e2c597000eff3a7233b40cca768b358f9bc9.zip | |
block: make 'top' argument to block-commit optional
Now that active layer block-commit is supported, the 'top' argument
no longer needs to be mandatory.
Change it to optional, with the default being the active layer in the
device chain.
[kwolf: Rebased and resolved conflict in tests/qemu-iotests/040]
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Benoit Canet <benoit@irqsave.net>
Signed-off-by: Jeff Cody <jcody@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'blockdev.c')
| -rw-r--r-- | blockdev.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/blockdev.c b/blockdev.c index 69b7c2a8c5..79ce52b58b 100644 --- a/blockdev.c +++ b/blockdev.c @@ -1913,7 +1913,8 @@ void qmp_block_stream(const char *device, bool has_base, } void qmp_block_commit(const char *device, - bool has_base, const char *base, const char *top, + bool has_base, const char *base, + bool has_top, const char *top, bool has_speed, int64_t speed, Error **errp) { @@ -1932,6 +1933,11 @@ void qmp_block_commit(const char *device, /* drain all i/o before commits */ bdrv_drain_all(); + /* Important Note: + * libvirt relies on the DeviceNotFound error class in order to probe for + * live commit feature versions; for this to work, we must make sure to + * perform the device lookup before any generic errors that may occur in a + * scenario in which all optional arguments are omitted. */ bs = bdrv_find(device); if (!bs) { error_set(errp, QERR_DEVICE_NOT_FOUND, device); @@ -1945,7 +1951,7 @@ void qmp_block_commit(const char *device, /* default top_bs is the active layer */ top_bs = bs; - if (top) { + if (has_top && top) { if (strcmp(bs->filename, top) != 0) { top_bs = bdrv_find_backing_image(bs, top); } @@ -1967,6 +1973,12 @@ void qmp_block_commit(const char *device, return; } + /* Do not allow attempts to commit an image into itself */ + if (top_bs == base_bs) { + error_setg(errp, "cannot commit an image into itself"); + return; + } + if (top_bs == bs) { commit_active_start(bs, base_bs, speed, on_error, block_job_cb, bs, &local_err); |