mirror of
https://gitlab.com/libvirt/libvirt.git
synced 2024-12-23 06:05:27 +00:00
storage: make it easier to find file within chain
In order to temporarily label files read/write during a commit operation, we need to crawl the backing chain and find the absolute file name that needs labeling in the first place, as well as the name of the file that owns the backing file. * src/util/storage_file.c (virStorageFileChainLookup): New function. * src/util/storage_file.h: Declare it. * src/libvirt_private.syms (storage_file.h): Export it.
This commit is contained in:
parent
82507838e0
commit
5eaf605447
@ -1132,6 +1132,7 @@ virStorageGenerateQcowPassphrase;
|
||||
|
||||
|
||||
# storage_file.h
|
||||
virStorageFileChainLookup;
|
||||
virStorageFileFormatTypeFromString;
|
||||
virStorageFileFormatTypeToString;
|
||||
virStorageFileFreeMetadata;
|
||||
|
@ -1262,3 +1262,67 @@ const char *virStorageFileGetSCSIKey(const char *path)
|
||||
return NULL;
|
||||
}
|
||||
#endif
|
||||
|
||||
/* Given a CHAIN that starts at the named file START, return a string
|
||||
* pointing to either START or within CHAIN that gives the preferred
|
||||
* name for the backing file NAME within that chain. Pass NULL for
|
||||
* NAME to find the base of the chain. If META is not NULL, set *META
|
||||
* to the point in the chain that describes NAME (or to NULL if the
|
||||
* backing element is not a file). If PARENT is not NULL, set *PARENT
|
||||
* to the preferred name of the parent (or to NULL if NAME matches
|
||||
* START). Since the results point within CHAIN, they must not be
|
||||
* independently freed. */
|
||||
const char *
|
||||
virStorageFileChainLookup(virStorageFileMetadataPtr chain, const char *start,
|
||||
const char *name, virStorageFileMetadataPtr *meta,
|
||||
const char **parent)
|
||||
{
|
||||
virStorageFileMetadataPtr owner;
|
||||
const char *tmp;
|
||||
|
||||
if (!parent)
|
||||
parent = &tmp;
|
||||
|
||||
*parent = NULL;
|
||||
if (name ? STREQ(start, name) || virFileLinkPointsTo(start, name) :
|
||||
!chain->backingStore) {
|
||||
if (meta)
|
||||
*meta = chain;
|
||||
return start;
|
||||
}
|
||||
|
||||
owner = chain;
|
||||
*parent = start;
|
||||
while (owner) {
|
||||
if (!owner->backingStore)
|
||||
goto error;
|
||||
if (!name) {
|
||||
if (!owner->backingMeta ||
|
||||
!owner->backingMeta->backingStore)
|
||||
break;
|
||||
} else if (STREQ_NULLABLE(name, owner->backingStoreRaw) ||
|
||||
STREQ(name, owner->backingStore)) {
|
||||
break;
|
||||
} else if (owner->backingStoreIsFile) {
|
||||
char *absName = absolutePathFromBaseFile(*parent, name);
|
||||
if (absName && STREQ(absName, owner->backingStore)) {
|
||||
VIR_FREE(absName);
|
||||
break;
|
||||
}
|
||||
VIR_FREE(absName);
|
||||
}
|
||||
*parent = owner->backingStore;
|
||||
owner = owner->backingMeta;
|
||||
}
|
||||
if (!owner)
|
||||
goto error;
|
||||
if (meta)
|
||||
*meta = owner->backingMeta;
|
||||
return owner->backingStore;
|
||||
|
||||
error:
|
||||
*parent = NULL;
|
||||
if (meta)
|
||||
*meta = NULL;
|
||||
return NULL;
|
||||
}
|
||||
|
@ -78,6 +78,13 @@ virStorageFileMetadataPtr virStorageFileGetMetadataFromFD(const char *path,
|
||||
int fd,
|
||||
int format);
|
||||
|
||||
const char *virStorageFileChainLookup(virStorageFileMetadataPtr chain,
|
||||
const char *start,
|
||||
const char *name,
|
||||
virStorageFileMetadataPtr *meta,
|
||||
const char **parent)
|
||||
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);
|
||||
|
||||
void virStorageFileFreeMetadata(virStorageFileMetadataPtr meta);
|
||||
|
||||
int virStorageFileResize(const char *path, unsigned long long capacity);
|
||||
|
Loading…
Reference in New Issue
Block a user