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block: rename and alter bdrv_all_find_snapshot semantics

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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 <eblake@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20210204124834.774401-7-berrange@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2021-02-04 12:48:28 +00:00 • committed by Dr. David Alan Gilbert
parent c22d644ca7
commit 3d3e9b1f66
5 changed files with 27 additions and 13 deletions
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6
include/block/snapshot.h
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@ -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,