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bh=OME4PFsZTHyoOjhxy8orEH4uwZGuPN3Q5Bt20Fh1TFE=; b=EVM8SBk+hsUmxbKw93q7BoypwMmU8g7n5fsTl+tEpFAI6ScdAP9k7xx8BCvJOtDs5jqULG xBAOhplzRrmOMh2Af20DOI2RiYmYPDzCXQW3BGNtNs48mVCo7LCXskkaM7YQdDWX0+Fvo6 3hn4Ut2ceXNXdZqtnmg28cJm1wh9yrw= X-MC-Unique: 7u3ObWRWPZWnzsAz1JGwNg-1 From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, andrey.gruzdev@virtuozzo.com, berrange@redhat.com, gaojinhao@huawei.com, armbru@redhat.com, mst@redhat.com, philmd@redhat.com, wainersm@redhat.com Subject: [PULL 21/27] block: rename and alter bdrv_all_find_snapshot semantics Date: Thu, 4 Feb 2021 16:39:53 +0000 Message-Id: <20210204163959.377618-22-dgilbert@redhat.com> In-Reply-To: <20210204163959.377618-1-dgilbert@redhat.com> References: <20210204163959.377618-1-dgilbert@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dgilbert@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=63.128.21.124; envelope-from=dgilbert@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.351, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) From: Daniel P. Berrang=C3=A9 Currently bdrv_all_find_snapshot() will return 0 if it finds a snapshot, -1 if an error occurs, or if it fails to find a snapshot. New callers to be added want to distinguish between the error scenario and failing to find a snapshot. Rename it to bdrv_all_has_snapshot and make it return -1 on error, 0 if no snapshot is found and 1 if snapshot is found. Reviewed-by: Eric Blake Signed-off-by: Daniel P. Berrang=C3=A9 Message-Id: <20210204124834.774401-7-berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert --- block/monitor/block-hmp-cmds.c | 2 +- block/snapshot.c | 19 ++++++++++++------- include/block/snapshot.h | 6 +++--- migration/savevm.c | 7 ++++++- replay/replay-debugging.c | 6 +++++- 5 files changed, 27 insertions(+), 13 deletions(-) diff --git a/block/monitor/block-hmp-cmds.c b/block/monitor/block-hmp-cmds.c index 9cc5d4b51e..75d7fa9510 100644 --- a/block/monitor/block-hmp-cmds.c +++ b/block/monitor/block-hmp-cmds.c @@ -954,7 +954,7 @@ void hmp_info_snapshots(Monitor *mon, const QDict *qdic= t) total =3D 0; for (i =3D 0; i < nb_sns; i++) { SnapshotEntry *next_sn; - if (bdrv_all_find_snapshot(sn_tab[i].name, false, NULL, NULL) =3D= =3D 0) { + if (bdrv_all_has_snapshot(sn_tab[i].name, false, NULL, NULL) =3D= =3D 1) { global_snapshots[total] =3D i; total++; QTAILQ_FOREACH(image_entry, &image_list, next) { diff --git a/block/snapshot.c b/block/snapshot.c index 0b129bee8f..e8ae9a28c1 100644 --- a/block/snapshot.c +++ b/block/snapshot.c @@ -603,9 +603,9 @@ int bdrv_all_goto_snapshot(const char *name, return 0; } =20 -int bdrv_all_find_snapshot(const char *name, - bool has_devices, strList *devices, - Error **errp) +int bdrv_all_has_snapshot(const char *name, + bool has_devices, strList *devices, + Error **errp) { g_autoptr(GList) bdrvs =3D NULL; GList *iterbdrvs; @@ -627,15 +627,20 @@ int bdrv_all_find_snapshot(const char *name, } aio_context_release(ctx); if (ret < 0) { - error_setg(errp, "Could not find snapshot '%s' on '%s'", - name, bdrv_get_device_or_node_name(bs)); - return -1; + if (ret =3D=3D -ENOENT) { + return 0; + } else { + error_setg_errno(errp, errno, + "Could not check snapshot '%s' on '%s'", + name, bdrv_get_device_or_node_name(bs)); + return -1; + } } =20 iterbdrvs =3D iterbdrvs->next; } =20 - return 0; + return 1; } =20 int bdrv_all_create_snapshot(QEMUSnapshotInfo *sn, diff --git a/include/block/snapshot.h b/include/block/snapshot.h index 8a6a37240d..940345692f 100644 --- a/include/block/snapshot.h +++ b/include/block/snapshot.h @@ -85,9 +85,9 @@ int bdrv_all_delete_snapshot(const char *name, int bdrv_all_goto_snapshot(const char *name, bool has_devices, strList *devices, Error **errp); -int bdrv_all_find_snapshot(const char *name, - bool has_devices, strList *devices, - Error **errp); +int bdrv_all_has_snapshot(const char *name, + bool has_devices, strList *devices, + Error **errp); int bdrv_all_create_snapshot(QEMUSnapshotInfo *sn, BlockDriverState *vm_state_bs, uint64_t vm_state_size, diff --git a/migration/savevm.c b/migration/savevm.c index cdd201e7f8..a2a842d067 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -2977,10 +2977,15 @@ bool load_snapshot(const char *name, Error **errp) if (!bdrv_all_can_snapshot(false, NULL, errp)) { return false; } - ret =3D bdrv_all_find_snapshot(name, false, NULL, errp); + ret =3D bdrv_all_has_snapshot(name, false, NULL, errp); if (ret < 0) { return false; } + if (ret =3D=3D 0) { + error_setg(errp, "Snapshot '%s' does not exist in one or more devi= ces", + name); + return false; + } =20 bs_vm_state =3D bdrv_all_find_vmstate_bs(NULL, false, NULL, errp); if (!bs_vm_state) { diff --git a/replay/replay-debugging.c b/replay/replay-debugging.c index ca37cf4025..098ef8e0f5 100644 --- a/replay/replay-debugging.c +++ b/replay/replay-debugging.c @@ -143,6 +143,7 @@ static char *replay_find_nearest_snapshot(int64_t icoun= t, QEMUSnapshotInfo *sn_tab; QEMUSnapshotInfo *nearest =3D NULL; char *ret =3D NULL; + int rv; int nb_sns, i; AioContext *aio_context; =20 @@ -159,7 +160,10 @@ static char *replay_find_nearest_snapshot(int64_t icou= nt, aio_context_release(aio_context); =20 for (i =3D 0; i < nb_sns; i++) { - if (bdrv_all_find_snapshot(sn_tab[i].name, false, NULL, NULL) =3D= =3D 0) { + rv =3D bdrv_all_has_snapshot(sn_tab[i].name, false, NULL, NULL); + if (rv < 0) + goto fail; + if (rv =3D=3D 1) { if (sn_tab[i].icount !=3D -1ULL && sn_tab[i].icount <=3D icount && (!nearest || nearest->icount < sn_tab[i].icount)) { --=20 2.29.2