Introduce a metadata structure and make virStorageGetMetadataFromFD()
fill it in.
* src/util/storage_file.h: add virStorageFileMetadata
* src/backend/storage_backend_fs.c: virStorageGetMetadataFromFD() now
fills in the virStorageFileMetadata structure
---
src/storage/storage_backend_fs.c | 65 ++++++++++++++++++-------------------
src/util/storage_file.h | 8 +++++
2 files changed, 40 insertions(+), 33 deletions(-)
diff --git a/src/storage/storage_backend_fs.c b/src/storage/storage_backend_fs.c
index 87c30cd..7db73bf 100644
--- a/src/storage/storage_backend_fs.c
+++ b/src/storage/storage_backend_fs.c
@@ -287,24 +287,13 @@ static int
virStorageGetMetadataFromFD(virConnectPtr conn,
const char *path,
int fd,
- int *format,
- bool *encrypted,
- char **backingStore,
- unsigned long long *capacity)
+ virStorageFileMetadata *meta)
{
unsigned char head[20*512]; /* vmdk4GetBackingStore needs this much. */
int len, i;
- if (format) /* If all else fails, call it a raw file */
- *format = VIR_STORAGE_FILE_RAW;
- if (encrypted)
- *encrypted = false;
- if (backingStore)
- *backingStore = NULL;
- /* Do not overwrite capacity
- * if (capacity)
- * *capacity = 0;
- */
+ /* If all else fails, call it a raw file */
+ meta->format = VIR_STORAGE_FILE_RAW;
if ((len = read(fd, head, sizeof(head))) < 0) {
virReportSystemError(conn, errno, _("cannot read header '%s'"), path);
@@ -345,9 +334,9 @@ virStorageGetMetadataFromFD(virConnectPtr conn,
}
/* Optionally extract capacity from file */
- if (fileTypeInfo[i].sizeOffset != -1 && capacity) {
+ if (fileTypeInfo[i].sizeOffset != -1) {
if (fileTypeInfo[i].endian == LV_LITTLE_ENDIAN) {
- *capacity =
+ meta->capacity =
((unsigned long long)head[fileTypeInfo[i].sizeOffset+7] <<
56) |
((unsigned long long)head[fileTypeInfo[i].sizeOffset+6] <<
48) |
((unsigned long long)head[fileTypeInfo[i].sizeOffset+5] <<
40) |
@@ -357,7 +346,7 @@ virStorageGetMetadataFromFD(virConnectPtr conn,
((unsigned long long)head[fileTypeInfo[i].sizeOffset+1] <<
8) |
((unsigned long long)head[fileTypeInfo[i].sizeOffset]);
} else {
- *capacity =
+ meta->capacity =
((unsigned long long)head[fileTypeInfo[i].sizeOffset] <<
56) |
((unsigned long long)head[fileTypeInfo[i].sizeOffset+1] <<
48) |
((unsigned long long)head[fileTypeInfo[i].sizeOffset+2] <<
40) |
@@ -368,25 +357,24 @@ virStorageGetMetadataFromFD(virConnectPtr conn,
((unsigned long long)head[fileTypeInfo[i].sizeOffset+7]);
}
/* Avoid unlikely, but theoretically possible overflow */
- if (*capacity > (ULLONG_MAX / fileTypeInfo[i].sizeMultiplier))
+ if (meta->capacity > (ULLONG_MAX / fileTypeInfo[i].sizeMultiplier))
continue;
- *capacity *= fileTypeInfo[i].sizeMultiplier;
+ meta->capacity *= fileTypeInfo[i].sizeMultiplier;
}
- if (fileTypeInfo[i].qcowCryptOffset != -1 && encrypted) {
+ if (fileTypeInfo[i].qcowCryptOffset != -1) {
int crypt_format;
crypt_format = (head[fileTypeInfo[i].qcowCryptOffset] << 24) |
(head[fileTypeInfo[i].qcowCryptOffset+1] << 16) |
(head[fileTypeInfo[i].qcowCryptOffset+2] << 8) |
head[fileTypeInfo[i].qcowCryptOffset+3];
- *encrypted = crypt_format != 0;
+ meta->encrypted = crypt_format != 0;
}
/* Validation passed, we know the file format now */
- if (format)
- *format = fileTypeInfo[i].type;
- if (fileTypeInfo[i].getBackingStore != NULL && backingStore) {
+ meta->format = fileTypeInfo[i].type;
+ if (fileTypeInfo[i].getBackingStore != NULL) {
char *base;
switch (fileTypeInfo[i].getBackingStore(conn, &base, head, len)) {
@@ -400,9 +388,9 @@ virStorageGetMetadataFromFD(virConnectPtr conn,
return -1;
}
if (base != NULL) {
- *backingStore = absolutePathFromBaseFile(path, base);
+ meta->backingStore = absolutePathFromBaseFile(path, base);
VIR_FREE(base);
- if (*backingStore == NULL) {
+ if (meta->backingStore == NULL) {
virReportOOMError(conn);
return -1;
}
@@ -419,8 +407,7 @@ virStorageGetMetadataFromFD(virConnectPtr conn,
if (!virFileHasSuffix(path, fileTypeInfo[i].extension))
continue;
- if (format)
- *format = fileTypeInfo[i].type;
+ meta->format = fileTypeInfo[i].type;
return 0;
}
@@ -436,7 +423,7 @@ virStorageBackendProbeTarget(virConnectPtr conn,
virStorageEncryptionPtr *encryption)
{
int fd, ret;
- bool encrypted;
+ virStorageFileMetadata meta;
if (encryption)
*encryption = NULL;
@@ -455,16 +442,28 @@ virStorageBackendProbeTarget(virConnectPtr conn,
return ret; /* Take care to propagate ret, it is not always -1 */
}
- if (virStorageGetMetadataFromFD(conn, target->path, fd,
- &target->format, &encrypted,
- backingStore, capacity) < 0) {
+ memset(&meta, 0, sizeof(meta));
+
+ if (virStorageGetMetadataFromFD(conn, target->path, fd, &meta) < 0) {
close(fd);
return -1;
}
close(fd);
- if (encryption != NULL && encrypted) {
+ target->format = meta.format;
+
+ if (backingStore) {
+ *backingStore = meta.backingStore;
+ meta.backingStore = NULL;
+ }
+
+ VIR_FREE(meta.backingStore);
+
+ if (capacity && meta.capacity)
+ *capacity = meta.capacity;
+
+ if (encryption != NULL && meta.encrypted) {
if (VIR_ALLOC(*encryption) < 0) {
virReportOOMError(conn);
if (backingStore)
diff --git a/src/util/storage_file.h b/src/util/storage_file.h
index 7bccbe4..b458c0e 100644
--- a/src/util/storage_file.h
+++ b/src/util/storage_file.h
@@ -25,6 +25,7 @@
#define __VIR_STORAGE_FILE_H__
#include "util.h"
+#include <stdbool.h>
enum virStorageFileFormat {
VIR_STORAGE_FILE_RAW = 0,
@@ -43,4 +44,11 @@ enum virStorageFileFormat {
VIR_ENUM_DECL(virStorageFileFormat);
+typedef struct _virStorageFileMetadata {
+ int format;
+ char *backingStore;
+ unsigned long long capacity;
+ bool encrypted;
+} virStorageFileMetadata;
+
#endif /* __VIR_STORAGE_FILE_H__ */
--
1.6.2.5
--
Libvir-list mailing list
Libvir-list@redhat.com
https://www.redhat.com/mailman/listinfo/libvir-list
