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snapshot: Make virDomainMomentObjListGetNames more generic

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Rather than hard-coding the snapshot filter bit values into the
generic code, add another layer of indirection: callers must map which
of their public filter bits correspond to supported moment bits, then
pass two separate flags (the ones translated for moment code to
operate on, and the remaining ones for the filter callback to operate
on).

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
This commit is contained in:
Eric Blake 2019-03-21 23:17:01 -05:00
parent 015e71c54d
commit a3d179807a
3 changed files with 75 additions and 21 deletions
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35
src/conf/virdomainmomentobjlist.c
View File

@ -281,6 +281,7 @@ struct virDomainMomentNameData {
int count;
bool error;
virDomainMomentObjListFilter filter;
unsigned int filter_flags;
};
@ -295,13 +296,12 @@ static int virDomainMomentObjListCopyNames(void *payload,
return 0;
/* Caller already sanitized flags. Filtering on DESCENDANTS was
* done by choice of iteration in the caller. */
/* TODO: Create VIR_DOMAIN_MOMENT_LIST names */
if ((data->flags & VIR_DOMAIN_SNAPSHOT_LIST_LEAVES) && obj->nchildren)
if ((data->flags & VIR_DOMAIN_MOMENT_LIST_LEAVES) && obj->nchildren)
return 0;
if ((data->flags & VIR_DOMAIN_SNAPSHOT_LIST_NO_LEAVES) && !obj->nchildren)
if ((data->flags & VIR_DOMAIN_MOMENT_LIST_NO_LEAVES) && !obj->nchildren)
return 0;
if (!data->filter(obj, data->flags))
if (!data->filter(obj, data->filter_flags))
return 0;
if (data->names && data->count < data->maxnames &&
@ -320,25 +320,26 @@ virDomainMomentObjListGetNames(virDomainMomentObjListPtr moments,
char **const names,
int maxnames,
unsigned int flags,
virDomainMomentObjListFilter filter)
virDomainMomentObjListFilter filter,
unsigned int filter_flags)
{
struct virDomainMomentNameData data = { names, maxnames, flags, 0,
false, filter };
false, filter, filter_flags };
size_t i;
virCheckFlags(VIR_DOMAIN_MOMENT_FILTERS_ALL, -1);
if (!from) {
/* LIST_ROOTS and LIST_DESCENDANTS have the same bit value,
* but opposite semantics. Toggle here to get the correct
* traversal on the metaroot. */
/* TODO: Create VIR_DOMAIN_MOMENT_LIST names */
flags ^= VIR_DOMAIN_SNAPSHOT_LIST_ROOTS;
flags ^= VIR_DOMAIN_MOMENT_LIST_ROOTS;
from = &moments->metaroot;
}
/* We handle LIST_ROOT/LIST_DESCENDANTS and LIST_TOPOLOGICAL directly,
* mask those bits out to determine when we must use the filter callback. */
data.flags &= ~(VIR_DOMAIN_SNAPSHOT_LIST_DESCENDANTS |
VIR_DOMAIN_SNAPSHOT_LIST_TOPOLOGICAL);
data.flags &= ~(VIR_DOMAIN_MOMENT_LIST_DESCENDANTS |
VIR_DOMAIN_MOMENT_LIST_TOPOLOGICAL);
/* If this common code is being used, we assume that all moments
* have metadata, and thus can handle METADATA up front as an
@ -346,26 +347,26 @@ virDomainMomentObjListGetNames(virDomainMomentObjListPtr moments,
* add the ability to track qcow2 internal snapshots without the
* use of metadata, in which case this check should move into the
* filter callback. */
if ((data.flags & VIR_DOMAIN_SNAPSHOT_FILTERS_METADATA) ==
VIR_DOMAIN_SNAPSHOT_LIST_NO_METADATA)
if ((data.flags & VIR_DOMAIN_MOMENT_FILTERS_METADATA) ==
VIR_DOMAIN_MOMENT_LIST_NO_METADATA)
return 0;
data.flags &= ~VIR_DOMAIN_SNAPSHOT_FILTERS_METADATA;
data.flags &= ~VIR_DOMAIN_MOMENT_FILTERS_METADATA;
if (flags & VIR_DOMAIN_SNAPSHOT_LIST_DESCENDANTS) {
if (flags & VIR_DOMAIN_MOMENT_LIST_DESCENDANTS) {
/* We could just always do a topological visit; but it is
* possible to optimize for less stack usage and time when a
* simpler full hashtable visit or counter will do. */
if (from->def || (names &&
(flags & VIR_DOMAIN_SNAPSHOT_LIST_TOPOLOGICAL)))
(flags & VIR_DOMAIN_MOMENT_LIST_TOPOLOGICAL)))
virDomainMomentForEachDescendant(from,
virDomainMomentObjListCopyNames,
&data);
else if (names || data.flags)
else if (names || data.flags || filter_flags)
virHashForEach(moments->objs, virDomainMomentObjListCopyNames,
&data);
else
data.count = virHashSize(moments->objs);
} else if (names || data.flags) {
} else if (names || data.flags || filter_flags) {
virDomainMomentForEachChild(from,
virDomainMomentObjListCopyNames, &data);
} else {

32
src/conf/virdomainmomentobjlist.h
View File

@ -70,12 +70,40 @@ void virDomainMomentObjListFree(virDomainMomentObjListPtr moments);
virDomainMomentObjPtr virDomainMomentAssignDef(virDomainMomentObjListPtr moments,
virDomainMomentDefPtr def);
/* Various enum bits that map to public API filters. Note that the
* values of the internal bits are not necessarily the same as the
* public ones. */
typedef enum {
VIR_DOMAIN_MOMENT_LIST_ROOTS = (1 << 0),
VIR_DOMAIN_MOMENT_LIST_DESCENDANTS = (1 << 0),
VIR_DOMAIN_MOMENT_LIST_TOPOLOGICAL = (1 << 1),
VIR_DOMAIN_MOMENT_LIST_LEAVES = (1 << 2),
VIR_DOMAIN_MOMENT_LIST_NO_LEAVES = (1 << 3),
VIR_DOMAIN_MOMENT_LIST_METADATA = (1 << 4),
VIR_DOMAIN_MOMENT_LIST_NO_METADATA = (1 << 5),
} virDomainMomentFilters;
# define VIR_DOMAIN_MOMENT_FILTERS_METADATA \
(VIR_DOMAIN_MOMENT_LIST_METADATA | \
VIR_DOMAIN_MOMENT_LIST_NO_METADATA)
# define VIR_DOMAIN_MOMENT_FILTERS_LEAVES \
(VIR_DOMAIN_MOMENT_LIST_LEAVES | \
VIR_DOMAIN_MOMENT_LIST_NO_LEAVES)
# define VIR_DOMAIN_MOMENT_FILTERS_ALL \
(VIR_DOMAIN_MOMENT_LIST_ROOTS | \
VIR_DOMAIN_MOMENT_LIST_TOPOLOGICAL | \
VIR_DOMAIN_MOMENT_FILTERS_METADATA | \
VIR_DOMAIN_MOMENT_FILTERS_LEAVES)
int virDomainMomentObjListGetNames(virDomainMomentObjListPtr moments,
virDomainMomentObjPtr from,
char **const names,
int maxnames,
unsigned int flags,
virDomainMomentObjListFilter filter);
unsigned int moment_flags,
virDomainMomentObjListFilter filter,
unsigned int filter_flags);
virDomainMomentObjPtr virDomainMomentFindByName(virDomainMomentObjListPtr moments,
const char *name);
int virDomainMomentObjListSize(virDomainMomentObjListPtr moments);

29
src/conf/virdomainsnapshotobjlist.c
View File

@ -278,6 +278,31 @@ virDomainSnapshotObjListGetNames(virDomainSnapshotObjListPtr snapshots,
int maxnames,
unsigned int flags)
{
/* Convert public flags into common flags */
unsigned int moment_flags = 0;
struct { int snap_flag; int moment_flag; } map[] = {
{ VIR_DOMAIN_SNAPSHOT_LIST_ROOTS,
VIR_DOMAIN_MOMENT_LIST_ROOTS, },
{ VIR_DOMAIN_SNAPSHOT_LIST_TOPOLOGICAL,
VIR_DOMAIN_MOMENT_LIST_TOPOLOGICAL, },
{ VIR_DOMAIN_SNAPSHOT_LIST_LEAVES,
VIR_DOMAIN_MOMENT_LIST_LEAVES, },
{ VIR_DOMAIN_SNAPSHOT_LIST_NO_LEAVES,
VIR_DOMAIN_MOMENT_LIST_NO_LEAVES, },
{ VIR_DOMAIN_SNAPSHOT_LIST_METADATA,
VIR_DOMAIN_MOMENT_LIST_METADATA, },
{ VIR_DOMAIN_SNAPSHOT_LIST_NO_METADATA,
VIR_DOMAIN_MOMENT_LIST_NO_METADATA, },
};
size_t i;
for (i = 0; i < ARRAY_CARDINALITY(map); i++) {
if (flags & map[i].snap_flag) {
flags &= ~map[i].snap_flag;
moment_flags |= map[i].moment_flag;
}
}
/* For ease of coding the visitor, it is easier to zero each group
* where all of the bits are set. */
if ((flags & VIR_DOMAIN_SNAPSHOT_FILTERS_LEAVES) ==
@ -290,8 +315,8 @@ virDomainSnapshotObjListGetNames(virDomainSnapshotObjListPtr snapshots,
VIR_DOMAIN_SNAPSHOT_FILTERS_LOCATION)
flags &= ~VIR_DOMAIN_SNAPSHOT_FILTERS_LOCATION;
return virDomainMomentObjListGetNames(snapshots->base, from, names,
maxnames, flags,
virDomainSnapshotFilter);
maxnames, moment_flags,
virDomainSnapshotFilter, flags);
}