[libvirt] [libvirt-glib] Add virStorageVolResize()
Zeeshan Ali (Khattak)
zeeshanak at gnome.org
Fri Jan 27 05:29:56 UTC 2012
From: "Zeeshan Ali (Khattak)" <zeeshanak at gnome.org>
Add a new function to allow changing of capacity of storage volumes.
---
include/libvirt/libvirt.h.in | 5 ++
src/driver.h | 5 ++
src/libvirt.c | 50 ++++++++++++++++++
src/libvirt_public.syms | 1 +
src/remote/remote_driver.c | 1 +
src/remote/remote_protocol.x | 9 +++-
src/remote_protocol-structs | 6 ++
src/storage/storage_backend.h | 6 ++
src/storage/storage_backend_fs.c | 18 +++++++
src/storage/storage_driver.c | 83 ++++++++++++++++++++++++++++++
src/util/storage_file.c | 105 ++++++++++++++++++++++++++++++++++++++
src/util/storage_file.h | 4 ++
tools/virsh.c | 53 +++++++++++++++++++
13 files changed, 345 insertions(+), 1 deletions(-)
diff --git a/include/libvirt/libvirt.h.in b/include/libvirt/libvirt.h.in
index e99cd00..b169592 100644
--- a/include/libvirt/libvirt.h.in
+++ b/include/libvirt/libvirt.h.in
@@ -2386,6 +2386,11 @@ char * virStorageVolGetXMLDesc (virStorageVolPtr pool,
char * virStorageVolGetPath (virStorageVolPtr vol);
+int virStorageVolResize (virStorageVolPtr vol,
+ unsigned long long capacity,
+ unsigned int flags);
+
+
/**
* virKeycodeSet:
*
diff --git a/src/driver.h b/src/driver.h
index df2aa60..c850926 100644
--- a/src/driver.h
+++ b/src/driver.h
@@ -1261,6 +1261,10 @@ typedef int
unsigned long long offset,
unsigned long long length,
unsigned int flags);
+typedef int
+ (*virDrvStorageVolResize) (virStorageVolPtr vol,
+ unsigned long long capacity,
+ unsigned int flags);
typedef int
(*virDrvStoragePoolIsActive)(virStoragePoolPtr pool);
@@ -1323,6 +1327,7 @@ struct _virStorageDriver {
virDrvStorageVolGetInfo volGetInfo;
virDrvStorageVolGetXMLDesc volGetXMLDesc;
virDrvStorageVolGetPath volGetPath;
+ virDrvStorageVolResize volResize;
virDrvStoragePoolIsActive poolIsActive;
virDrvStoragePoolIsPersistent poolIsPersistent;
};
diff --git a/src/libvirt.c b/src/libvirt.c
index e9d638b..44865e8 100644
--- a/src/libvirt.c
+++ b/src/libvirt.c
@@ -12927,6 +12927,56 @@ error:
return NULL;
}
+/**
+ * virStorageVolResize:
+ * @vol: pointer to storage volume
+ * @capacity: new capacity
+ * @flags: extra flags; not used yet, so callers should always pass 0
+ *
+ * Changes the capacity of the storage volume @vol to @capacity. The new
+ * capacity must not exceed the sum of current capacity of the volume and
+ * remainining free space of its parent pool. Also the new capacity must
+ * be greater than or equal to current allocation of the volume.
+ *
+ * Returns 0 on success, or -1 on error.
+ */
+int
+virStorageVolResize(virStorageVolPtr vol,
+ unsigned long long capacity,
+ unsigned int flags)
+{
+ virConnectPtr conn;
+ VIR_DEBUG("vol=%p", vol);
+
+ virResetLastError();
+
+ if (!VIR_IS_STORAGE_VOL(vol)) {
+ virLibStorageVolError(VIR_ERR_INVALID_STORAGE_VOL, __FUNCTION__);
+ virDispatchError(NULL);
+ return -1;
+ }
+
+ conn = vol->conn;
+
+ if (conn->flags & VIR_CONNECT_RO) {
+ virLibConnError(VIR_ERR_OPERATION_DENIED, __FUNCTION__);
+ goto error;
+ }
+
+ if (conn->storageDriver && conn->storageDriver->volResize) {
+ int ret;
+ ret = conn->storageDriver->volResize(vol, capacity, flags);
+ if (ret < 0)
+ goto error;
+ return ret;
+ }
+
+ virLibConnError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
+
+error:
+ virDispatchError(vol->conn);
+ return -1;
+}
/**
* virNodeNumOfDevices:
diff --git a/src/libvirt_public.syms b/src/libvirt_public.syms
index 1340b0c..67c113e 100644
--- a/src/libvirt_public.syms
+++ b/src/libvirt_public.syms
@@ -520,6 +520,7 @@ LIBVIRT_0.9.10 {
global:
virDomainShutdownFlags;
virStorageVolWipePattern;
+ virStorageVolResize;
} LIBVIRT_0.9.9;
# .... define new API here using predicted next version number ....
diff --git a/src/remote/remote_driver.c b/src/remote/remote_driver.c
index f79f53e..2bb4cbf 100644
--- a/src/remote/remote_driver.c
+++ b/src/remote/remote_driver.c
@@ -4837,6 +4837,7 @@ static virStorageDriver storage_driver = {
.volGetInfo = remoteStorageVolGetInfo, /* 0.4.1 */
.volGetXMLDesc = remoteStorageVolGetXMLDesc, /* 0.4.1 */
.volGetPath = remoteStorageVolGetPath, /* 0.4.1 */
+ .volResize = remoteStorageVolResize, /* 0.9.10 */
.poolIsActive = remoteStoragePoolIsActive, /* 0.7.3 */
.poolIsPersistent = remoteStoragePoolIsPersistent, /* 0.7.3 */
};
diff --git a/src/remote/remote_protocol.x b/src/remote/remote_protocol.x
index 0f354bb..29f98fc 100644
--- a/src/remote/remote_protocol.x
+++ b/src/remote/remote_protocol.x
@@ -1676,6 +1676,12 @@ struct remote_storage_vol_get_path_ret {
remote_nonnull_string name;
};
+struct remote_storage_vol_resize_args {
+ remote_nonnull_storage_vol vol;
+ unsigned hyper capacity;
+ unsigned int flags;
+};
+
/* Node driver calls: */
struct remote_node_num_of_devices_args {
@@ -2667,7 +2673,8 @@ enum remote_procedure {
REMOTE_PROC_DOMAIN_SET_INTERFACE_PARAMETERS = 256, /* autogen autogen */
REMOTE_PROC_DOMAIN_GET_INTERFACE_PARAMETERS = 257, /* skipgen skipgen */
REMOTE_PROC_DOMAIN_SHUTDOWN_FLAGS = 258, /* autogen autogen */
- REMOTE_PROC_STORAGE_VOL_WIPE_PATTERN = 259 /* autogen autogen */
+ REMOTE_PROC_STORAGE_VOL_WIPE_PATTERN = 259, /* autogen autogen */
+ REMOTE_PROC_STORAGE_VOL_RESIZE = 300 /* autogen autogen */
/*
* Notice how the entries are grouped in sets of 10 ?
diff --git a/src/remote_protocol-structs b/src/remote_protocol-structs
index de85862..9a60fc2 100644
--- a/src/remote_protocol-structs
+++ b/src/remote_protocol-structs
@@ -1260,6 +1260,11 @@ struct remote_storage_vol_get_path_args {
struct remote_storage_vol_get_path_ret {
remote_nonnull_string name;
};
+struct remote_storage_vol_resize_args {
+ remote_nonnull_storage_vol vol;
+ uint64_t capacity;
+ u_int flags;
+};
struct remote_node_num_of_devices_args {
remote_string cap;
u_int flags;
@@ -2101,4 +2106,5 @@ enum remote_procedure {
REMOTE_PROC_DOMAIN_GET_INTERFACE_PARAMETERS = 257,
REMOTE_PROC_DOMAIN_SHUTDOWN_FLAGS = 258,
REMOTE_PROC_STORAGE_VOL_WIPE_PATTERN = 259,
+ REMOTE_PROC_STORAGE_VOL_RESIZE = 300,
};
diff --git a/src/storage/storage_backend.h b/src/storage/storage_backend.h
index 75ed676..a37bf7c 100644
--- a/src/storage/storage_backend.h
+++ b/src/storage/storage_backend.h
@@ -44,6 +44,11 @@ typedef int (*virStorageBackendDeleteVol)(virConnectPtr conn, virStoragePoolObjP
typedef int (*virStorageBackendBuildVolFrom)(virConnectPtr conn, virStoragePoolObjPtr pool,
virStorageVolDefPtr origvol, virStorageVolDefPtr newvol,
unsigned int flags);
+typedef int (*virStorageBackendVolumeResize)(virConnectPtr conn,
+ virStoragePoolObjPtr pool,
+ virStorageVolDefPtr vol,
+ unsigned long long capacity,
+ unsigned int flags);
/* File creation/cloning functions used for cloning between backends */
int virStorageBackendCreateRaw(virConnectPtr conn,
@@ -78,6 +83,7 @@ struct _virStorageBackend {
virStorageBackendCreateVol createVol;
virStorageBackendRefreshVol refreshVol;
virStorageBackendDeleteVol deleteVol;
+ virStorageBackendVolumeResize resizeVol;
};
virStorageBackendPtr virStorageBackendForType(int type);
diff --git a/src/storage/storage_backend_fs.c b/src/storage/storage_backend_fs.c
index d8dc29c..20f5534 100644
--- a/src/storage/storage_backend_fs.c
+++ b/src/storage/storage_backend_fs.c
@@ -1187,6 +1187,21 @@ virStorageBackendFileSystemVolRefresh(virConnectPtr conn,
return 0;
}
+/**
+ * Resize a volume
+ */
+static int
+virStorageBackendFileSystemVolResize(virConnectPtr conn ATTRIBUTE_UNUSED,
+ virStoragePoolObjPtr pool ATTRIBUTE_UNUSED,
+ virStorageVolDefPtr vol,
+ unsigned long long capacity,
+ unsigned int flags ATTRIBUTE_UNUSED)
+{
+ return virStorageFileResize(vol->target.path,
+ vol->target.format,
+ capacity);
+}
+
virStorageBackend virStorageBackendDirectory = {
.type = VIR_STORAGE_POOL_DIR,
@@ -1199,6 +1214,7 @@ virStorageBackend virStorageBackendDirectory = {
.createVol = virStorageBackendFileSystemVolCreate,
.refreshVol = virStorageBackendFileSystemVolRefresh,
.deleteVol = virStorageBackendFileSystemVolDelete,
+ .resizeVol = virStorageBackendFileSystemVolResize,
};
#if WITH_STORAGE_FS
@@ -1216,6 +1232,7 @@ virStorageBackend virStorageBackendFileSystem = {
.createVol = virStorageBackendFileSystemVolCreate,
.refreshVol = virStorageBackendFileSystemVolRefresh,
.deleteVol = virStorageBackendFileSystemVolDelete,
+ .resizeVol = virStorageBackendFileSystemVolResize,
};
virStorageBackend virStorageBackendNetFileSystem = {
.type = VIR_STORAGE_POOL_NETFS,
@@ -1232,5 +1249,6 @@ virStorageBackend virStorageBackendNetFileSystem = {
.createVol = virStorageBackendFileSystemVolCreate,
.refreshVol = virStorageBackendFileSystemVolRefresh,
.deleteVol = virStorageBackendFileSystemVolDelete,
+ .resizeVol = virStorageBackendFileSystemVolResize,
};
#endif /* WITH_STORAGE_FS */
diff --git a/src/storage/storage_driver.c b/src/storage/storage_driver.c
index a332ada..d3eff93 100644
--- a/src/storage/storage_driver.c
+++ b/src/storage/storage_driver.c
@@ -1695,7 +1695,89 @@ out:
return ret;
}
+static int
+storageVolumeResize(virStorageVolPtr obj,
+ unsigned long long capacity,
+ unsigned int flags)
+{
+ virStorageDriverStatePtr driver = obj->conn->storagePrivateData;
+ virStorageBackendPtr backend;
+ virStoragePoolObjPtr pool = NULL;
+ virStorageVolDefPtr vol = NULL;
+ int ret = -1;
+
+ virCheckFlags(0, -1);
+
+ storageDriverLock(driver);
+ pool = virStoragePoolObjFindByName(&driver->pools, obj->pool);
+ storageDriverUnlock(driver);
+ if (!pool) {
+ virStorageReportError(VIR_ERR_NO_STORAGE_POOL,
+ "%s", _("no storage pool with matching uuid"));
+ goto out;
+ }
+
+ if (!virStoragePoolObjIsActive(pool)) {
+ virStorageReportError(VIR_ERR_OPERATION_INVALID,
+ "%s", _("storage pool is not active"));
+ goto out;
+ }
+
+ if ((backend = virStorageBackendForType(pool->def->type)) == NULL)
+ goto out;
+
+ vol = virStorageVolDefFindByName(pool, obj->name);
+
+ if (vol == NULL) {
+ virStorageReportError(VIR_ERR_NO_STORAGE_VOL,
+ _("no storage vol with matching name '%s'"),
+ obj->name);
+ goto out;
+ }
+
+ if (vol->building) {
+ virStorageReportError(VIR_ERR_OPERATION_INVALID,
+ _("volume '%s' is still being allocated."),
+ vol->name);
+ goto out;
+ }
+
+ if (capacity < vol->allocation) {
+ virStorageReportError(VIR_ERR_INVALID_ARG,
+ "%s", _("can not shrink capacity below "
+ "existing allocation"));
+
+ goto out;
+ }
+
+ if (capacity > vol->allocation + pool->def->available) {
+ virStorageReportError(VIR_ERR_INVALID_ARG,
+ "%s", _("Not enough space left on storage pool"));
+
+ goto out;
+ }
+
+ if (!backend->resizeVol) {
+ virStorageReportError(VIR_ERR_NO_SUPPORT,
+ "%s", _("storage pool does not support changing "
+ "of volume capacity"));
+
+ goto out;
+ }
+
+ if (backend->resizeVol(obj->conn, pool, vol, capacity, flags) < 0)
+ goto out;
+
+ vol->capacity = capacity;
+ ret = 0;
+
+out:
+ if (pool)
+ virStoragePoolObjUnlock(pool);
+
+ return ret;
+}
/* If the volume we're wiping is already a sparse file, we simply
* truncate and extend it to its original size, filling it with
@@ -2243,6 +2325,7 @@ static virStorageDriver storageDriver = {
.volGetInfo = storageVolumeGetInfo, /* 0.4.0 */
.volGetXMLDesc = storageVolumeGetXMLDesc, /* 0.4.0 */
.volGetPath = storageVolumeGetPath, /* 0.4.0 */
+ .volResize = storageVolumeResize, /* 0.9.10 */
.poolIsActive = storagePoolIsActive, /* 0.7.3 */
.poolIsPersistent = storagePoolIsPersistent, /* 0.7.3 */
diff --git a/src/util/storage_file.c b/src/util/storage_file.c
index ba9cfc5..f84feab 100644
--- a/src/util/storage_file.c
+++ b/src/util/storage_file.c
@@ -931,6 +931,111 @@ virStorageFileFreeMetadata(virStorageFileMetadata *meta)
VIR_FREE(meta);
}
+static int
+virStorageFileResizeForFD(const char *path,
+ int fd,
+ int format,
+ unsigned long long capacity)
+{
+ unsigned char *head = NULL;
+ ssize_t len = STORAGE_MAX_HEAD;
+ int ret = -1;
+ struct stat sb;
+
+ if (fstat(fd, &sb) < 0) {
+ virReportSystemError(errno,
+ _("cannot stat file '%s'"),
+ path);
+ return -1;
+ }
+
+ /* No header to probe for directories */
+ if (S_ISDIR(sb.st_mode)) {
+ return 0;
+ }
+
+ if (lseek(fd, 0, SEEK_SET) == (off_t)-1) {
+ virReportSystemError(errno, _("cannot seek to start of '%s'"), path);
+ return -1;
+ }
+
+ if (VIR_ALLOC_N(head, len) < 0) {
+ virReportOOMError();
+ return -1;
+ }
+
+ if ((len = read(fd, head, len)) < 0) {
+ virReportSystemError(errno, _("cannot read header '%s'"), path);
+ goto cleanup;
+ }
+
+ if (format == VIR_STORAGE_FILE_AUTO)
+ format = virStorageFileProbeFormatFromBuf(path, head, len);
+
+ if (format < 0 ||
+ format >= VIR_STORAGE_FILE_LAST) {
+ virReportSystemError(EINVAL, _("unknown storage file format %d"),
+ format);
+ goto cleanup;
+ }
+
+ if (fileTypeInfo[format].sizeOffset != -1) {
+ unsigned long long *file_capacity;
+
+ if ((fileTypeInfo[format].sizeOffset + 8) > len)
+ return -1;
+
+ file_capacity = (unsigned long long *)(head + fileTypeInfo[format].sizeOffset);
+ if (fileTypeInfo[format].endian == LV_LITTLE_ENDIAN)
+ *file_capacity = htole64(capacity);
+ else
+ *file_capacity = htobe64(capacity);
+
+ *file_capacity /= fileTypeInfo[format].sizeMultiplier;
+ }
+
+ /* Move to start of file to write the header back with adjusted capacity */
+ if (lseek(fd, 0, SEEK_SET) == (off_t)-1) {
+ virReportSystemError(errno, _("cannot seek to start of '%s'"), path);
+ return -1;
+ }
+
+ if ((len = write(fd, head, len)) < 0) {
+ virReportSystemError(errno, _("cannot write header '%s'"), path);
+ goto cleanup;
+ }
+
+ ret = 0;
+
+cleanup:
+ VIR_FREE(head);
+ return ret;
+}
+
+/**
+ * virStorageFileResize:
+ *
+ * Change the capacity of the storage file at 'path'.
+ */
+int
+virStorageFileResize(const char *path,
+ int format,
+ unsigned long long capacity)
+{
+ int fd, ret;
+
+ if ((fd = open(path, O_RDWR)) < 0) {
+ virReportSystemError(errno, _("cannot open file '%s'"), path);
+ return -1;
+ }
+
+ ret = virStorageFileResizeForFD(path, fd, format, capacity);
+
+ VIR_FORCE_CLOSE(fd);
+
+ return ret;
+}
+
#ifdef __linux__
# ifndef NFS_SUPER_MAGIC
diff --git a/src/util/storage_file.h b/src/util/storage_file.h
index b8920d0..f6c6048 100644
--- a/src/util/storage_file.h
+++ b/src/util/storage_file.h
@@ -72,6 +72,10 @@ int virStorageFileGetMetadataFromFD(const char *path,
void virStorageFileFreeMetadata(virStorageFileMetadata *meta);
+int virStorageFileResize(const char *path,
+ int format,
+ unsigned long long capacity);
+
enum {
VIR_STORAGE_FILE_SHFS_NFS = (1 << 0),
VIR_STORAGE_FILE_SHFS_GFS2 = (1 << 1),
diff --git a/tools/virsh.c b/tools/virsh.c
index 74655c2..20d4bd0 100644
--- a/tools/virsh.c
+++ b/tools/virsh.c
@@ -11279,6 +11279,58 @@ cmdVolInfo(vshControl *ctl, const vshCmd *cmd)
return ret;
}
+/*
+ * "vol-resize" command
+ */
+static const vshCmdInfo info_vol_resize[] = {
+ {"help", N_("resize a vol")},
+ {"desc", N_("Resizes a storage vol.")},
+ {NULL, NULL}
+};
+
+static const vshCmdOptDef opts_vol_resize[] = {
+ {"vol", VSH_OT_DATA, VSH_OFLAG_REQ, N_("vol name, key or path")},
+ {"capacity", VSH_OT_DATA, VSH_OFLAG_REQ, N_("new capacity for the vol with optional k,M,G,T suffix")},
+ {"pool", VSH_OT_STRING, 0, N_("pool name or uuid")},
+ {NULL, 0, 0, NULL}
+};
+
+static bool
+cmdVolResize(vshControl *ctl, const vshCmd *cmd)
+{
+ virStorageVolPtr vol;
+ const char *capacityStr = NULL;
+ unsigned long long capacity = 0;
+ bool ret = true;
+
+ if (!vshConnectionUsability(ctl, ctl->conn))
+ return false;
+
+ if (!(vol = vshCommandOptVol(ctl, cmd, "vol", "pool", NULL)))
+ return false;
+
+ if (vshCommandOptString(cmd, "capacity", &capacityStr) <= 0)
+ goto cleanup;
+ if (cmdVolSize(capacityStr, &capacity) < 0) {
+ vshError(ctl, _("Malformed size %s"), capacityStr);
+ goto cleanup;
+ }
+
+ if (virStorageVolResize(vol, capacity, 0) == 0) {
+ vshPrint(ctl, "Size of volume '%s' successfully changed to %s\n",
+ virStorageVolGetName(vol), capacityStr);
+ ret = true;
+ } else {
+ vshError(ctl, "Failed to change size of volume '%s' to %s\n",
+ virStorageVolGetName(vol), capacityStr);
+ ret = false;
+ }
+
+cleanup:
+ virStorageVolFree(vol);
+ return ret;
+}
+
/*
* "vol-dumpxml" command
@@ -16141,6 +16193,7 @@ static const vshCmdDef storageVolCmds[] = {
{"vol-pool", cmdVolPool, opts_vol_pool, info_vol_pool, 0},
{"vol-upload", cmdVolUpload, opts_vol_upload, info_vol_upload, 0},
{"vol-wipe", cmdVolWipe, opts_vol_wipe, info_vol_wipe, 0},
+ {"vol-resize", cmdVolResize, opts_vol_resize, info_vol_resize, 0},
{NULL, NULL, NULL, NULL, 0}
};
--
1.7.7.5
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