[libvirt] [PATCH] util: Use VIR_AUTOUNREF for virstoragefile
John Ferlan
jferlan at redhat.com
Mon Feb 18 15:27:06 UTC 2019
Let's make use of the auto __cleanup capabilities cleaning up any
now unnecessary goto paths.
Signed-off-by: John Ferlan <jferlan at redhat.com>
---
BTW: I did try this with a linked travis-ci and github branch, and it
worked for me. I'm avoiding altering virStorageFileMetadataNew...
src/util/virstoragefile.c | 130 +++++++++++++++-----------------------
1 file changed, 52 insertions(+), 78 deletions(-)
diff --git a/src/util/virstoragefile.c b/src/util/virstoragefile.c
index b2e308d81d..003183bf76 100644
--- a/src/util/virstoragefile.c
+++ b/src/util/virstoragefile.c
@@ -1205,11 +1205,11 @@ virStorageFileGetMetadataFromFD(const char *path,
{
virStorageSourcePtr ret = NULL;
- virStorageSourcePtr meta = NULL;
ssize_t len = VIR_STORAGE_MAX_HEADER;
struct stat sb;
int dummy;
VIR_AUTOFREE(char *) buf = NULL;
+ VIR_AUTOUNREF(virStorageSourcePtr) meta = NULL;
if (!backingFormat)
backingFormat = &dummy;
@@ -1231,21 +1231,21 @@ virStorageFileGetMetadataFromFD(const char *path,
meta->type = VIR_STORAGE_TYPE_DIR;
meta->format = VIR_STORAGE_FILE_DIR;
VIR_STEAL_PTR(ret, meta);
- goto cleanup;
+ return ret;
}
if (lseek(fd, 0, SEEK_SET) == (off_t)-1) {
virReportSystemError(errno, _("cannot seek to start of '%s'"), meta->path);
- goto cleanup;
+ return NULL;
}
if ((len = virFileReadHeaderFD(fd, len, &buf)) < 0) {
virReportSystemError(errno, _("cannot read header '%s'"), meta->path);
- goto cleanup;
+ return NULL;
}
if (virStorageFileGetMetadataInternal(meta, buf, len, backingFormat) < 0)
- goto cleanup;
+ return NULL;
if (S_ISREG(sb.st_mode))
meta->type = VIR_STORAGE_TYPE_FILE;
@@ -1253,9 +1253,6 @@ virStorageFileGetMetadataFromFD(const char *path,
meta->type = VIR_STORAGE_TYPE_BLOCK;
VIR_STEAL_PTR(ret, meta);
-
- cleanup:
- virObjectUnref(meta);
return ret;
}
@@ -2243,7 +2240,8 @@ virStorageSourcePtr
virStorageSourceCopy(const virStorageSource *src,
bool backingChain)
{
- virStorageSourcePtr def = NULL;
+ virStorageSourcePtr ret = NULL;
+ VIR_AUTOUNREF(virStorageSourcePtr) def = NULL;
if (!(def = virStorageSourceNew()))
return NULL;
@@ -2282,60 +2280,57 @@ virStorageSourceCopy(const virStorageSource *src,
VIR_STRDUP(def->compat, src->compat) < 0 ||
VIR_STRDUP(def->tlsAlias, src->tlsAlias) < 0 ||
VIR_STRDUP(def->tlsCertdir, src->tlsCertdir) < 0)
- goto error;
+ return NULL;
if (src->nhosts) {
if (!(def->hosts = virStorageNetHostDefCopy(src->nhosts, src->hosts)))
- goto error;
+ return NULL;
def->nhosts = src->nhosts;
}
if (src->srcpool &&
!(def->srcpool = virStorageSourcePoolDefCopy(src->srcpool)))
- goto error;
+ return NULL;
if (src->features &&
!(def->features = virBitmapNewCopy(src->features)))
- goto error;
+ return NULL;
if (src->encryption &&
!(def->encryption = virStorageEncryptionCopy(src->encryption)))
- goto error;
+ return NULL;
if (src->perms &&
!(def->perms = virStoragePermsCopy(src->perms)))
- goto error;
+ return NULL;
if (src->timestamps &&
!(def->timestamps = virStorageTimestampsCopy(src->timestamps)))
- goto error;
+ return NULL;
if (virStorageSourceSeclabelsCopy(def, src) < 0)
- goto error;
+ return NULL;
if (src->auth &&
!(def->auth = virStorageAuthDefCopy(src->auth)))
- goto error;
+ return NULL;
if (src->pr &&
!(def->pr = virStoragePRDefCopy(src->pr)))
- goto error;
+ return NULL;
if (virStorageSourceInitiatorCopy(&def->initiator, &src->initiator))
- goto error;
+ return NULL;
if (backingChain && src->backingStore) {
if (!(def->backingStore = virStorageSourceCopy(src->backingStore,
true)))
- goto error;
+ return NULL;
}
- return def;
-
- error:
- virObjectUnref(def);
- return NULL;
+ VIR_STEAL_PTR(ret, def);
+ return ret;
}
@@ -2601,27 +2596,28 @@ static virStorageSourcePtr
virStorageSourceNewFromBackingRelative(virStorageSourcePtr parent,
const char *rel)
{
- virStorageSourcePtr def;
+ virStorageSourcePtr ret = NULL;
VIR_AUTOFREE(char *) dirname = NULL;
+ VIR_AUTOUNREF(virStorageSourcePtr) def = NULL;
if (!(def = virStorageSourceNew()))
return NULL;
/* store relative name */
if (VIR_STRDUP(def->relPath, parent->backingStoreRaw) < 0)
- goto error;
+ return NULL;
if (!(dirname = mdir_name(parent->path))) {
virReportOOMError();
- goto error;
+ return NULL;
}
if (STRNEQ(dirname, "/")) {
if (virAsprintf(&def->path, "%s/%s", dirname, rel) < 0)
- goto error;
+ return NULL;
} else {
if (virAsprintf(&def->path, "/%s", rel) < 0)
- goto error;
+ return NULL;
}
if (virStorageSourceGetActualType(parent) == VIR_STORAGE_TYPE_NETWORK) {
@@ -2632,25 +2628,20 @@ virStorageSourceNewFromBackingRelative(virStorageSourcePtr parent,
if (parent->nhosts) {
if (!(def->hosts = virStorageNetHostDefCopy(parent->nhosts,
parent->hosts)))
- goto error;
+ return NULL;
def->nhosts = parent->nhosts;
}
if (VIR_STRDUP(def->volume, parent->volume) < 0)
- goto error;
+ return NULL;
} else {
/* set the type to _FILE, the caller shall update it to the actual type */
def->type = VIR_STORAGE_TYPE_FILE;
}
- cleanup:
- return def;
-
- error:
- virObjectUnref(def);
- def = NULL;
- goto cleanup;
+ VIR_STEAL_PTR(ret, def);
+ return ret;
}
@@ -3648,8 +3639,9 @@ virStorageSourcePtr
virStorageSourceNewFromBackingAbsolute(const char *path)
{
const char *json;
- virStorageSourcePtr def;
+ virStorageSourcePtr ret = NULL;
int rc;
+ VIR_AUTOUNREF(virStorageSourcePtr) def = NULL;
if (!(def = virStorageSourceNew()))
return NULL;
@@ -3658,7 +3650,7 @@ virStorageSourceNewFromBackingAbsolute(const char *path)
def->type = VIR_STORAGE_TYPE_FILE;
if (VIR_STRDUP(def->path, path) < 0)
- goto error;
+ return NULL;
} else {
def->type = VIR_STORAGE_TYPE_NETWORK;
@@ -3673,7 +3665,7 @@ virStorageSourceNewFromBackingAbsolute(const char *path)
rc = virStorageSourceParseBackingColon(def, path);
if (rc < 0)
- goto error;
+ return NULL;
virStorageSourceNetworkAssignDefaultPorts(def);
@@ -3686,11 +3678,8 @@ virStorageSourceNewFromBackingAbsolute(const char *path)
}
}
- return def;
-
- error:
- virObjectUnref(def);
- return NULL;
+ VIR_STEAL_PTR(ret, def);
+ return ret;
}
@@ -3698,7 +3687,8 @@ virStorageSourcePtr
virStorageSourceNewFromBacking(virStorageSourcePtr parent)
{
struct stat st;
- virStorageSourcePtr def;
+ virStorageSourcePtr ret = NULL;
+ VIR_AUTOUNREF(virStorageSourcePtr) def = NULL;
if (virStorageIsRelative(parent->backingStoreRaw))
def = virStorageSourceNewFromBackingRelative(parent,
@@ -3721,17 +3711,14 @@ virStorageSourceNewFromBacking(virStorageSourcePtr parent)
/* copy parent's labelling and other top level stuff */
if (virStorageSourceInitChainElement(def, parent, true) < 0)
- goto error;
+ return NULL;
def->readonly = true;
def->detected = true;
}
- return def;
-
- error:
- virObjectUnref(def);
- return NULL;
+ VIR_STEAL_PTR(ret, def);
+ return ret;
}
@@ -3872,9 +3859,8 @@ virStorageSourceUpdateCapacity(virStorageSourcePtr src,
ssize_t len,
bool probe)
{
- int ret = -1;
- virStorageSourcePtr meta = NULL;
int format = src->format;
+ VIR_AUTOUNREF(virStorageSourcePtr) meta = NULL;
/* Raw files: capacity is physical size. For all other files: if
* the metadata has a capacity, use that, otherwise fall back to
@@ -3884,12 +3870,12 @@ virStorageSourceUpdateCapacity(virStorageSourcePtr src,
virReportError(VIR_ERR_INTERNAL_ERROR,
_("no disk format for %s and probing is disabled"),
src->path);
- goto cleanup;
+ return -1;
}
if ((format = virStorageFileProbeFormatFromBuf(src->path,
buf, len)) < 0)
- goto cleanup;
+ return -1;
src->format = format;
}
@@ -3902,17 +3888,13 @@ virStorageSourceUpdateCapacity(virStorageSourcePtr src,
if (src->encryption && meta->encryption)
src->encryption->payload_offset = meta->encryption->payload_offset;
} else {
- goto cleanup;
+ return -1;
}
if (src->encryption && src->encryption->payload_offset != -1)
src->capacity -= src->encryption->payload_offset * 512;
- ret = 0;
-
- cleanup:
- virObjectUnref(meta);
- return ret;
+ return 0;
}
@@ -4849,10 +4831,10 @@ virStorageFileGetMetadataRecurse(virStorageSourcePtr src,
int ret = -1;
const char *uniqueName;
ssize_t headerLen;
- virStorageSourcePtr backingStore = NULL;
int backingFormat;
int rv;
VIR_AUTOFREE(char *) buf = NULL;
+ VIR_AUTOUNREF(virStorageSourcePtr) backingStore = NULL;
VIR_DEBUG("path=%s format=%d uid=%u gid=%u",
src->path, src->format,
@@ -4935,7 +4917,6 @@ virStorageFileGetMetadataRecurse(virStorageSourcePtr src,
if (virStorageSourceHasBacking(src))
src->backingStore->id = depth;
virStorageFileDeinit(src);
- virObjectUnref(backingStore);
return ret;
}
@@ -5004,11 +4985,10 @@ int
virStorageFileGetBackingStoreStr(virStorageSourcePtr src,
char **backing)
{
- virStorageSourcePtr tmp = NULL;
ssize_t headerLen;
- int ret = -1;
int rv;
VIR_AUTOFREE(char *) buf = NULL;
+ VIR_AUTOUNREF(virStorageSourcePtr) tmp = NULL;
*backing = NULL;
@@ -5032,17 +5012,11 @@ virStorageFileGetBackingStoreStr(virStorageSourcePtr src,
}
if (!(tmp = virStorageSourceCopy(src, false)))
- goto cleanup;
+ return -1;
if (virStorageFileGetMetadataInternal(tmp, buf, headerLen, NULL) < 0)
- goto cleanup;
+ return -1;
VIR_STEAL_PTR(*backing, tmp->backingStoreRaw);
-
- ret = 0;
-
- cleanup:
- virObjectUnref(tmp);
-
- return ret;
+ return 0;
}
--
2.20.1
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