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storage: move block format lookup to shared UpdateVolInfo

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This commit is contained in:
Cole Robinson 2014-03-30 18:50:36 -04:00
parent 16d75d19fc
commit 847a9eb17e
7 changed files with 103 additions and 159 deletions
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175
src/storage/storage_backend.c
View File

@ -1198,6 +1198,80 @@ virStorageFileBackendForType(int type,
}
struct diskType {
int part_table_type;
unsigned short offset;
unsigned short length;
unsigned long long magic;
};
static struct diskType const disk_types[] = {
{ VIR_STORAGE_POOL_DISK_LVM2, 0x218, 8, 0x31303020324D564CULL },
{ VIR_STORAGE_POOL_DISK_GPT, 0x200, 8, 0x5452415020494645ULL },
{ VIR_STORAGE_POOL_DISK_DVH, 0x0, 4, 0x41A9E50BULL },
{ VIR_STORAGE_POOL_DISK_MAC, 0x0, 2, 0x5245ULL },
{ VIR_STORAGE_POOL_DISK_BSD, 0x40, 4, 0x82564557ULL },
{ VIR_STORAGE_POOL_DISK_SUN, 0x1fc, 2, 0xBEDAULL },
/*
* NOTE: pc98 is funky; the actual signature is 0x55AA (just like dos), so
* we can't use that. At the moment I'm relying on the "dummy" IPL
* bootloader data that comes from parted. Luckily, the chances of running
* into a pc98 machine running libvirt are approximately nil.
*/
/*{ 0x1fe, 2, 0xAA55UL },*/
{ VIR_STORAGE_POOL_DISK_PC98, 0x0, 8, 0x314C5049000000CBULL },
/*
* NOTE: the order is important here; some other disk types (like GPT and
* and PC98) also have 0x55AA at this offset. For that reason, the DOS
* one must be the last one.
*/
{ VIR_STORAGE_POOL_DISK_DOS, 0x1fe, 2, 0xAA55ULL },
{ -1, 0x0, 0, 0x0ULL },
};
static int
virStorageBackendDetectBlockVolFormatFD(virStorageVolTargetPtr target,
int fd)
{
size_t i;
off_t start;
unsigned char buffer[1024];
ssize_t bytes;
/* make sure to set the target format "unknown" to begin with */
target->format = VIR_STORAGE_POOL_DISK_UNKNOWN;
start = lseek(fd, 0, SEEK_SET);
if (start < 0) {
virReportSystemError(errno,
_("cannot seek to beginning of file '%s'"),
target->path);
return -1;
}
bytes = saferead(fd, buffer, sizeof(buffer));
if (bytes < 0) {
virReportSystemError(errno,
_("cannot read beginning of file '%s'"),
target->path);
return -1;
}
for (i = 0; disk_types[i].part_table_type != -1; i++) {
if (disk_types[i].offset + disk_types[i].length > bytes)
continue;
if (memcmp(buffer+disk_types[i].offset, &disk_types[i].magic,
disk_types[i].length) == 0) {
target->format = disk_types[i].part_table_type;
break;
}
}
return 0;
}
/*
* Allows caller to silently ignore files with improper mode
*
@ -1316,22 +1390,30 @@ int
virStorageBackendUpdateVolTargetInfo(virStorageVolTargetPtr target,
unsigned long long *allocation,
unsigned long long *capacity,
bool withBlockVolFormat,
unsigned int openflags)
{
int ret, fd;
int ret, fd = -1;
struct stat sb;
if ((ret = virStorageBackendVolOpenCheckMode(target->path, &sb,
openflags)) < 0)
return ret;
goto cleanup;
fd = ret;
ret = virStorageBackendUpdateVolTargetInfoFD(target,
fd,
&sb,
allocation,
capacity);
if ((ret = virStorageBackendUpdateVolTargetInfoFD(target,
fd,
&sb,
allocation,
capacity)) < 0)
goto cleanup;
if (withBlockVolFormat) {
if ((ret = virStorageBackendDetectBlockVolFormatFD(target, fd)) < 0)
goto cleanup;
}
cleanup:
VIR_FORCE_CLOSE(fd);
return ret;
@ -1340,6 +1422,7 @@ virStorageBackendUpdateVolTargetInfo(virStorageVolTargetPtr target,
int
virStorageBackendUpdateVolInfo(virStorageVolDefPtr vol,
bool withCapacity,
bool withBlockVolFormat,
unsigned int openflags)
{
int ret;
@ -1347,12 +1430,14 @@ virStorageBackendUpdateVolInfo(virStorageVolDefPtr vol,
if ((ret = virStorageBackendUpdateVolTargetInfo(&vol->target,
&vol->allocation,
withCapacity ? &vol->capacity : NULL,
withBlockVolFormat,
openflags)) < 0)
return ret;
if (vol->backingStore.path &&
(ret = virStorageBackendUpdateVolTargetInfo(&vol->backingStore,
NULL, NULL,
withBlockVolFormat,
VIR_STORAGE_VOL_OPEN_DEFAULT)) < 0)
return ret;
@ -1455,80 +1540,6 @@ virStorageBackendUpdateVolTargetInfoFD(virStorageVolTargetPtr target,
}
struct diskType {
int part_table_type;
unsigned short offset;
unsigned short length;
unsigned long long magic;
};
static struct diskType const disk_types[] = {
{ VIR_STORAGE_POOL_DISK_LVM2, 0x218, 8, 0x31303020324D564CULL },
{ VIR_STORAGE_POOL_DISK_GPT, 0x200, 8, 0x5452415020494645ULL },
{ VIR_STORAGE_POOL_DISK_DVH, 0x0, 4, 0x41A9E50BULL },
{ VIR_STORAGE_POOL_DISK_MAC, 0x0, 2, 0x5245ULL },
{ VIR_STORAGE_POOL_DISK_BSD, 0x40, 4, 0x82564557ULL },
{ VIR_STORAGE_POOL_DISK_SUN, 0x1fc, 2, 0xBEDAULL },
/*
* NOTE: pc98 is funky; the actual signature is 0x55AA (just like dos), so
* we can't use that. At the moment I'm relying on the "dummy" IPL
* bootloader data that comes from parted. Luckily, the chances of running
* into a pc98 machine running libvirt are approximately nil.
*/
/*{ 0x1fe, 2, 0xAA55UL },*/
{ VIR_STORAGE_POOL_DISK_PC98, 0x0, 8, 0x314C5049000000CBULL },
/*
* NOTE: the order is important here; some other disk types (like GPT and
* and PC98) also have 0x55AA at this offset. For that reason, the DOS
* one must be the last one.
*/
{ VIR_STORAGE_POOL_DISK_DOS, 0x1fe, 2, 0xAA55ULL },
{ -1, 0x0, 0, 0x0ULL },
};
int
virStorageBackendDetectBlockVolFormatFD(virStorageVolTargetPtr target,
int fd)
{
size_t i;
off_t start;
unsigned char buffer[1024];
ssize_t bytes;
/* make sure to set the target format "unknown" to begin with */
target->format = VIR_STORAGE_POOL_DISK_UNKNOWN;
start = lseek(fd, 0, SEEK_SET);
if (start < 0) {
virReportSystemError(errno,
_("cannot seek to beginning of file '%s'"),
target->path);
return -1;
}
bytes = saferead(fd, buffer, sizeof(buffer));
if (bytes < 0) {
virReportSystemError(errno,
_("cannot read beginning of file '%s'"),
target->path);
return -1;
}
for (i = 0; disk_types[i].part_table_type != -1; i++) {
if (disk_types[i].offset + disk_types[i].length > bytes)
continue;
if (memcmp(buffer+disk_types[i].offset, &disk_types[i].magic,
disk_types[i].length) == 0) {
target->format = disk_types[i].part_table_type;
break;
}
}
return 0;
}
/*
* Given a volume path directly in /dev/XXX, iterate over the
* entries in the directory pool->def->target.path and find the

4
src/storage/storage_backend.h
View File

@ -139,18 +139,18 @@ int virStorageBackendVolOpenCheckMode(const char *path, struct stat *sb,
int virStorageBackendUpdateVolInfo(virStorageVolDefPtr vol,
bool withCapacity,
bool withBlockVolFormat,
unsigned int openflags);
int virStorageBackendUpdateVolTargetInfo(virStorageVolTargetPtr target,
unsigned long long *allocation,
unsigned long long *capacity,
bool withBlockVolFormat,
unsigned int openflags);
int virStorageBackendUpdateVolTargetInfoFD(virStorageVolTargetPtr target,
int fd,
struct stat *sb,
unsigned long long *allocation,
unsigned long long *capacity);
int virStorageBackendDetectBlockVolFormatFD(virStorageVolTargetPtr target,
int fd);
char *virStorageBackendStablePath(virStoragePoolObjPtr pool,
const char *devpath,

2
src/storage/storage_backend_disk.c
View File

@ -113,7 +113,7 @@ virStorageBackendDiskMakeDataVol(virStoragePoolObjPtr pool,
}
/* Refresh allocation/capacity/perms */
if (virStorageBackendUpdateVolInfo(vol, true,
if (virStorageBackendUpdateVolInfo(vol, true, false,
VIR_STORAGE_VOL_OPEN_DEFAULT) < 0)
return -1;

4
src/storage/storage_backend_fs.c
View File

@ -895,7 +895,7 @@ virStorageBackendFileSystemRefresh(virConnectPtr conn ATTRIBUTE_UNUSED,
vol->backingStore.format = backingStoreFormat;
if (virStorageBackendUpdateVolTargetInfo(&vol->backingStore,
NULL, NULL,
NULL, NULL, false,
VIR_STORAGE_VOL_OPEN_DEFAULT) < 0) {
/* The backing file is currently unavailable, the capacity,
* allocation, owner, group and mode are unknown. Just log the
@ -1180,7 +1180,7 @@ virStorageBackendFileSystemVolRefresh(virConnectPtr conn,
int ret;
/* Refresh allocation / permissions info in case its changed */
ret = virStorageBackendUpdateVolInfo(vol, false,
ret = virStorageBackendUpdateVolInfo(vol, false, false,
VIR_STORAGE_VOL_FS_OPEN_FLAGS);
if (ret < 0)
return ret;

2
src/storage/storage_backend_logical.c
View File

@ -149,7 +149,7 @@ virStorageBackendLogicalMakeVol(char **const groups,
if (!vol->key && VIR_STRDUP(vol->key, groups[2]) < 0)
goto cleanup;
if (virStorageBackendUpdateVolInfo(vol, true,
if (virStorageBackendUpdateVolInfo(vol, true, false,
VIR_STORAGE_VOL_OPEN_DEFAULT) < 0)
goto cleanup;

36
src/storage/storage_backend_mpath.c
View File

@ -41,37 +41,6 @@
VIR_LOG_INIT("storage.storage_backend_mpath");
static int
virStorageBackendMpathUpdateVolTargetInfo(virStorageVolTargetPtr target,
unsigned long long *allocation,
unsigned long long *capacity)
{
int ret = -1;
int fdret, fd = -1;
struct stat sb;
if ((fdret = virStorageBackendVolOpenCheckMode(target->path, &sb,
VIR_STORAGE_VOL_OPEN_DEFAULT)) < 0)
goto out;
fd = fdret;
if (virStorageBackendUpdateVolTargetInfoFD(target,
fd,
&sb,
allocation,
capacity) < 0)
goto out;
if (virStorageBackendDetectBlockVolFormatFD(target, fd) < 0)
goto out;
ret = 0;
out:
VIR_FORCE_CLOSE(fd);
return ret;
}
static int
virStorageBackendMpathNewVol(virStoragePoolObjPtr pool,
const int devnum,
@ -91,9 +60,8 @@ virStorageBackendMpathNewVol(virStoragePoolObjPtr pool,
if (virAsprintf(&vol->target.path, "/dev/%s", dev) < 0)
goto cleanup;
if (virStorageBackendMpathUpdateVolTargetInfo(&vol->target,
&vol->allocation,
&vol->capacity) < 0) {
if (virStorageBackendUpdateVolInfo(vol, true, true,
VIR_STORAGE_VOL_OPEN_DEFAULT) < 0) {
goto cleanup;
}

39
src/storage/storage_backend_scsi.c
View File

@ -102,39 +102,6 @@ getDeviceType(uint32_t host,
return retval;
}
static int
virStorageBackendSCSIUpdateVolTargetInfo(virStorageVolTargetPtr target,
unsigned long long *allocation,
unsigned long long *capacity)
{
int fdret, fd = -1;
int ret = -1;
struct stat sb;
if ((fdret = virStorageBackendVolOpenCheckMode(target->path, &sb,
VIR_STORAGE_VOL_OPEN_DEFAULT)) < 0)
goto cleanup;
fd = fdret;
if (virStorageBackendUpdateVolTargetInfoFD(target,
fd,
&sb,
allocation,
capacity) < 0)
goto cleanup;
if (virStorageBackendDetectBlockVolFormatFD(target, fd) < 0)
goto cleanup;
ret = 0;
cleanup:
VIR_FORCE_CLOSE(fd);
return ret;
}
static char *
virStorageBackendSCSISerial(const char *dev)
{
@ -232,10 +199,8 @@ virStorageBackendSCSINewLun(virStoragePoolObjPtr pool,
goto free_vol;
}
if (virStorageBackendSCSIUpdateVolTargetInfo(&vol->target,
&vol->allocation,
&vol->capacity) < 0) {
if (virStorageBackendUpdateVolInfo(vol, true, true,
VIR_STORAGE_VOL_OPEN_DEFAULT) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Failed to update volume for '%s'"),
devpath);