--- /dev/null
+/*
+ * storage_backend_fs.c: storage backend for FS and directory handling
+ *
+ * Copyright (C) 2007-2008 Red Hat, Inc.
+ * Copyright (C) 2007-2008 Daniel P. Berrange
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Author: Daniel P. Berrange <berrange@redhat.com>
+ */
+
+#include <config.h>
+
+#include <sys/statvfs.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdio.h>
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <endian.h>
+#include <byteswap.h>
+#include <mntent.h>
+#include <string.h>
+
+#include "storage_backend_fs.h"
+#include "storage_conf.h"
+#include "util.h"
+#include "config.h"
+
+
+enum {
+ VIR_STORAGE_POOL_FS_AUTO = 0,
+ VIR_STORAGE_POOL_FS_EXT2,
+ VIR_STORAGE_POOL_FS_EXT3,
+ VIR_STORAGE_POOL_FS_EXT4,
+ VIR_STORAGE_POOL_FS_UFS,
+ VIR_STORAGE_POOL_FS_ISO,
+ VIR_STORAGE_POOL_FS_UDF,
+ VIR_STORAGE_POOL_FS_GFS,
+ VIR_STORAGE_POOL_FS_GFS2,
+ VIR_STORAGE_POOL_FS_VFAT,
+ VIR_STORAGE_POOL_FS_HFSPLUS,
+ VIR_STORAGE_POOL_FS_XFS,
+};
+
+enum {
+ VIR_STORAGE_POOL_NETFS_AUTO = 0,
+ VIR_STORAGE_POOL_NETFS_NFS,
+};
+
+
+
+enum {
+ VIR_STORAGE_VOL_RAW,
+ VIR_STORAGE_VOL_DIR,
+ VIR_STORAGE_VOL_BOCHS,
+ VIR_STORAGE_VOL_CLOOP,
+ VIR_STORAGE_VOL_COW,
+ VIR_STORAGE_VOL_DMG,
+ VIR_STORAGE_VOL_ISO,
+ VIR_STORAGE_VOL_QCOW,
+ VIR_STORAGE_VOL_QCOW2,
+ VIR_STORAGE_VOL_VMDK,
+ VIR_STORAGE_VOL_VPC,
+};
+
+/* Either 'magic' or 'extension' *must* be provided */
+struct {
+ int type; /* One of the constants above */
+ const char *magic; /* Optional string of file magic
+ * to check at head of file */
+ const char *extension; /* Optional file extension to check */
+ int endian; /* Endianness of file format */
+ int versionOffset; /* Byte offset from start of file
+ * where we find version number,
+ * -1 to skip version test */
+ int versionNumber; /* Version number to validate */
+ int sizeOffset; /* Byte offset from start of file
+ * where we find capacity info,
+ * -1 to use st_size as capacity */
+ int sizeBytes; /* Number of bytes for size field */
+ int sizeMultiplier; /* A scaling factor if size is not in bytes */
+} fileTypeInfo[] = {
+ /* Bochs */
+ /* XXX Untested
+ { VIR_STORAGE_VOL_BOCHS, "Bochs Virtual HD Image", NULL,
+ __LITTLE_ENDIAN, 64, 0x20000,
+ 32+16+16+4+4+4+4+4, 8, 1 },*/
+ /* CLoop */
+ /* XXX Untested
+ { VIR_STORAGE_VOL_CLOOP, "#!/bin/sh\n#V2.0 Format\nmodprobe cloop file=$0 && mount -r -t iso9660 /dev/cloop $1\n", NULL,
+ __LITTLE_ENDIAN, -1, 0,
+ -1, 0, 0 }, */
+ /* Cow */
+ { VIR_STORAGE_VOL_COW, "OOOM", NULL,
+ __BIG_ENDIAN, 4, 2,
+ 4+4+1024+4, 8, 1 },
+ /* DMG */
+ /* XXX QEMU says there's no magic for dmg, but we should check... */
+ { VIR_STORAGE_VOL_DMG, NULL, ".dmg",
+ 0, -1, 0,
+ -1, 0, 0 },
+ /* XXX there's probably some magic for iso we can validate too... */
+ { VIR_STORAGE_VOL_ISO, NULL, ".iso",
+ 0, -1, 0,
+ -1, 0, 0 },
+ /* Parallels */
+ /* XXX Untested
+ { VIR_STORAGE_VOL_PARALLELS, "WithoutFreeSpace", NULL,
+ __LITTLE_ENDIAN, 16, 2,
+ 16+4+4+4+4, 4, 512 },
+ */
+ /* QCow */
+ { VIR_STORAGE_VOL_QCOW, "QFI", NULL,
+ __BIG_ENDIAN, 4, 1,
+ 4+4+8+4+4, 8, 1 },
+ /* QCow 2 */
+ { VIR_STORAGE_VOL_QCOW2, "QFI", NULL,
+ __BIG_ENDIAN, 4, 2,
+ 4+4+8+4+4, 8, 1 },
+ /* VMDK 3 */
+ /* XXX Untested
+ { VIR_STORAGE_VOL_VMDK, "COWD", NULL,
+ __LITTLE_ENDIAN, 4, 1,
+ 4+4+4, 4, 512 },
+ */
+ /* VMDK 4 */
+ { VIR_STORAGE_VOL_VMDK, "KDMV", NULL,
+ __LITTLE_ENDIAN, 4, 1,
+ 4+4+4, 8, 512 },
+ /* Connectix / VirtualPC */
+ /* XXX Untested
+ { VIR_STORAGE_VOL_VPC, "conectix", NULL,
+ __BIG_ENDIAN, -1, 0,
+ -1, 0, 0},
+ */
+};
+
+
+
+
+static int
+virStorageBackendFileSystemVolFormatFromString(virConnectPtr conn,
+ const char *format) {
+ if (format == NULL)
+ return VIR_STORAGE_VOL_RAW;
+
+ if (STREQ(format, "raw"))
+ return VIR_STORAGE_VOL_RAW;
+ if (STREQ(format, "dir"))
+ return VIR_STORAGE_VOL_DIR;
+ if (STREQ(format, "bochs"))
+ return VIR_STORAGE_VOL_BOCHS;
+ if (STREQ(format, "cow"))
+ return VIR_STORAGE_VOL_COW;
+ if (STREQ(format, "cloop"))
+ return VIR_STORAGE_VOL_CLOOP;
+ if (STREQ(format, "dmg"))
+ return VIR_STORAGE_VOL_DMG;
+ if (STREQ(format, "iso"))
+ return VIR_STORAGE_VOL_ISO;
+ if (STREQ(format, "qcow"))
+ return VIR_STORAGE_VOL_QCOW;
+ if (STREQ(format, "qcow2"))
+ return VIR_STORAGE_VOL_QCOW2;
+ if (STREQ(format, "vmdk"))
+ return VIR_STORAGE_VOL_VMDK;
+ if (STREQ(format, "vpc"))
+ return VIR_STORAGE_VOL_VPC;
+
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("unsupported volume format %s"), format);
+ return -1;
+}
+
+static const char *
+virStorageBackendFileSystemVolFormatToString(virConnectPtr conn,
+ int format) {
+ switch (format) {
+ case VIR_STORAGE_VOL_RAW:
+ return "raw";
+ case VIR_STORAGE_VOL_DIR:
+ return "dir";
+ case VIR_STORAGE_VOL_BOCHS:
+ return "bochs";
+ case VIR_STORAGE_VOL_CLOOP:
+ return "cloop";
+ case VIR_STORAGE_VOL_COW:
+ return "cow";
+ case VIR_STORAGE_VOL_DMG:
+ return "dmg";
+ case VIR_STORAGE_VOL_ISO:
+ return "iso";
+ case VIR_STORAGE_VOL_QCOW:
+ return "qcow";
+ case VIR_STORAGE_VOL_QCOW2:
+ return "qcow2";
+ case VIR_STORAGE_VOL_VMDK:
+ return "vmdk";
+ case VIR_STORAGE_VOL_VPC:
+ return "vpc";
+ }
+
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("unsupported volume format %d"), format);
+ return NULL;
+}
+
+
+static int
+virStorageBackendFileSystemPoolFormatFromString(virConnectPtr conn,
+ const char *format) {
+ if (format == NULL)
+ return VIR_STORAGE_POOL_FS_AUTO;
+
+ if (STREQ(format, "auto"))
+ return VIR_STORAGE_POOL_FS_AUTO;
+ if (STREQ(format, "ext2"))
+ return VIR_STORAGE_POOL_FS_EXT2;
+ if (STREQ(format, "ext3"))
+ return VIR_STORAGE_POOL_FS_EXT3;
+ if (STREQ(format, "ext4"))
+ return VIR_STORAGE_POOL_FS_EXT4;
+ if (STREQ(format, "ufs"))
+ return VIR_STORAGE_POOL_FS_UFS;
+ if (STREQ(format, "iso9660"))
+ return VIR_STORAGE_POOL_FS_ISO;
+ if (STREQ(format, "udf"))
+ return VIR_STORAGE_POOL_FS_UDF;
+ if (STREQ(format, "gfs"))
+ return VIR_STORAGE_POOL_FS_GFS;
+ if (STREQ(format, "gfs2"))
+ return VIR_STORAGE_POOL_FS_GFS2;
+ if (STREQ(format, "vfat"))
+ return VIR_STORAGE_POOL_FS_VFAT;
+ if (STREQ(format, "hfs+"))
+ return VIR_STORAGE_POOL_FS_HFSPLUS;
+ if (STREQ(format, "xfs"))
+ return VIR_STORAGE_POOL_FS_XFS;
+
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("unsupported volume format %s"), format);
+ return -1;
+}
+
+static const char *
+virStorageBackendFileSystemPoolFormatToString(virConnectPtr conn,
+ int format) {
+ switch (format) {
+ case VIR_STORAGE_POOL_FS_AUTO:
+ return "auto";
+ case VIR_STORAGE_POOL_FS_EXT2:
+ return "ext2";
+ case VIR_STORAGE_POOL_FS_EXT3:
+ return "ext3";
+ case VIR_STORAGE_POOL_FS_EXT4:
+ return "ext4";
+ case VIR_STORAGE_POOL_FS_UFS:
+ return "ufs";
+ case VIR_STORAGE_POOL_FS_ISO:
+ return "iso";
+ case VIR_STORAGE_POOL_FS_UDF:
+ return "udf";
+ case VIR_STORAGE_POOL_FS_GFS:
+ return "gfs";
+ case VIR_STORAGE_POOL_FS_GFS2:
+ return "gfs2";
+ case VIR_STORAGE_POOL_FS_VFAT:
+ return "vfat";
+ case VIR_STORAGE_POOL_FS_HFSPLUS:
+ return "hfs+";
+ case VIR_STORAGE_POOL_FS_XFS:
+ return "xfs";
+ }
+
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("unsupported volume format %d"), format);
+ return NULL;
+}
+
+
+static int
+virStorageBackendFileSystemNetPoolFormatFromString(virConnectPtr conn,
+ const char *format) {
+ if (format == NULL)
+ return VIR_STORAGE_POOL_NETFS_AUTO;
+
+ if (STREQ(format, "auto"))
+ return VIR_STORAGE_POOL_NETFS_AUTO;
+ if (STREQ(format, "nfs"))
+ return VIR_STORAGE_POOL_NETFS_NFS;
+
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("unsupported volume format %s"), format);
+ return -1;
+}
+
+static const char *
+virStorageBackendFileSystemNetPoolFormatToString(virConnectPtr conn,
+ int format) {
+ switch (format) {
+ case VIR_STORAGE_POOL_NETFS_AUTO:
+ return "auto";
+ case VIR_STORAGE_POOL_NETFS_NFS:
+ return "nfs";
+ }
+
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("unsupported volume format %d"), format);
+ return NULL;
+}
+
+
+/**
+ * Probe the header of a file to determine what type of disk image
+ * it is, and info about its capacity if available.
+ */
+static int virStorageBackendProbeFile(virConnectPtr conn,
+ virStorageVolDefPtr def) {
+ int fd;
+ char head[4096];
+ int len, i, ret;
+
+ if ((fd = open(def->target.path, O_RDONLY)) < 0) {
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("cannot open volume '%s': %s"),
+ def->target.path, strerror(errno));
+ return -1;
+ }
+
+ if ((ret = virStorageBackendUpdateVolInfoFD(conn, def, fd, 1)) < 0) {
+ close(fd);
+ return ret; /* Take care to propagate ret, it is not always -1 */
+ }
+
+ if ((len = read(fd, head, sizeof(head))) < 0) {
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("cannot read header '%s': %s"),
+ def->target.path, strerror(errno));
+ close(fd);
+ return -1;
+ }
+
+ close(fd);
+
+ /* First check file magic */
+ for (i = 0 ; i < sizeof(fileTypeInfo)/sizeof(fileTypeInfo[0]) ; i++) {
+ int mlen;
+ if (fileTypeInfo[i].magic == NULL)
+ continue;
+
+ /* Validate magic data */
+ mlen = strlen(fileTypeInfo[i].magic);
+ if (mlen > len)
+ continue;
+ if (memcmp(head, fileTypeInfo[i].magic, mlen) != 0)
+ continue;
+
+ /* Validate version number info */
+ if (fileTypeInfo[i].versionNumber != -1) {
+ int version;
+
+ if (fileTypeInfo[i].endian == __LITTLE_ENDIAN) {
+ version = (head[fileTypeInfo[i].versionOffset+3] << 24) |
+ (head[fileTypeInfo[i].versionOffset+2] << 16) |
+ (head[fileTypeInfo[i].versionOffset+1] << 8) |
+ head[fileTypeInfo[i].versionOffset];
+ } else {
+ version = (head[fileTypeInfo[i].versionOffset] << 24) |
+ (head[fileTypeInfo[i].versionOffset+1] << 16) |
+ (head[fileTypeInfo[i].versionOffset+2] << 8) |
+ head[fileTypeInfo[i].versionOffset+3];
+ }
+ if (version != fileTypeInfo[i].versionNumber)
+ continue;
+ }
+
+ /* Optionally extract capacity from file */
+ if (fileTypeInfo[i].sizeOffset != -1) {
+ if (fileTypeInfo[i].endian == __LITTLE_ENDIAN) {
+ def->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) |
+ ((unsigned long long)head[fileTypeInfo[i].sizeOffset+4] << 32) |
+ ((unsigned long long)head[fileTypeInfo[i].sizeOffset+3] << 24) |
+ ((unsigned long long)head[fileTypeInfo[i].sizeOffset+2] << 16) |
+ ((unsigned long long)head[fileTypeInfo[i].sizeOffset+1] << 8) |
+ ((unsigned long long)head[fileTypeInfo[i].sizeOffset]);
+ } else {
+ def->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) |
+ ((unsigned long long)head[fileTypeInfo[i].sizeOffset+3] << 32) |
+ ((unsigned long long)head[fileTypeInfo[i].sizeOffset+4] << 24) |
+ ((unsigned long long)head[fileTypeInfo[i].sizeOffset+5] << 16) |
+ ((unsigned long long)head[fileTypeInfo[i].sizeOffset+6] << 8) |
+ ((unsigned long long)head[fileTypeInfo[i].sizeOffset+7]);
+ }
+ /* Avoid unlikely, but theoretically possible overflow */
+ if (def->capacity > (ULLONG_MAX / fileTypeInfo[i].sizeMultiplier))
+ continue;
+ def->capacity *= fileTypeInfo[i].sizeMultiplier;
+ }
+
+ /* Validation passed, we know the file format now */
+ def->target.format = fileTypeInfo[i].type;
+ return 0;
+ }
+
+ /* No magic, so check file extension */
+ for (i = 0 ; i < sizeof(fileTypeInfo)/sizeof(fileTypeInfo[0]) ; i++) {
+ if (fileTypeInfo[i].extension == NULL)
+ continue;
+
+ if (!virFileHasSuffix(def->target.path, fileTypeInfo[i].extension))
+ continue;
+
+ def->target.format = fileTypeInfo[i].type;
+ return 0;
+ }
+
+ /* All fails, so call it a raw file */
+ def->target.format = VIR_STORAGE_VOL_RAW;
+ return 0;
+}
+
+#if WITH_STORAGE_FS
+/**
+ * @conn connection to report errors against
+ * @pool storage pool to check for status
+ *
+ * Determine if a storage pool is already mounted
+ *
+ * Return 0 if not mounted, 1 if mounted, -1 on error
+ */
+static int
+virStorageBackendFileSystemIsMounted(virConnectPtr conn,
+ virStoragePoolObjPtr pool) {
+ FILE *mtab;
+ struct mntent *ent;
+
+ if ((mtab = fopen(_PATH_MOUNTED, "r")) == NULL) {
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("cannot read %s: %s"),
+ _PATH_MOUNTED, strerror(errno));
+ return -1;
+ }
+
+ while ((ent = getmntent(mtab)) != NULL) {
+ if (STREQ(ent->mnt_dir, pool->def->target.path)) {
+ fclose(mtab);
+ return 1;
+ }
+ }
+
+ fclose(mtab);
+ return 0;
+}
+
+/**
+ * @conn connection to report errors against
+ * @pool storage pool to mount
+ *
+ * Ensure that a FS storage pool is mounted on its target location.
+ * If already mounted, this is a no-op
+ *
+ * Returns 0 if successfully mounted, -1 on error
+ */
+static int
+virStorageBackendFileSystemMount(virConnectPtr conn,
+ virStoragePoolObjPtr pool) {
+ char *src;
+ const char *mntargv[] = {
+ MOUNT,
+ "-t",
+ pool->def->type == VIR_STORAGE_POOL_FS ?
+ virStorageBackendFileSystemPoolFormatToString(conn,
+ pool->def->source.format) :
+ virStorageBackendFileSystemNetPoolFormatToString(conn,
+ pool->def->source.format),
+ NULL, /* Fill in shortly - careful not to add extra fields before this */
+ pool->def->target.path,
+ NULL,
+ };
+ int ret;
+
+ if (pool->def->type == VIR_STORAGE_POOL_NETFS) {
+ if (pool->def->source.host.name == NULL) {
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("missing source host"));
+ return -1;
+ }
+ if (pool->def->source.dir == NULL) {
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("missing source path"));
+ return -1;
+ }
+ } else {
+ if (pool->def->source.ndevice != 1) {
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("missing source device"));
+ return -1;
+ }
+ }
+
+ /* Short-circuit is already mounted */
+ if ((ret = virStorageBackendFileSystemIsMounted(conn, pool)) != 0) {
+ if (ret < 0)
+ return -1;
+ else
+ return 0;
+ }
+
+ if (pool->def->type == VIR_STORAGE_POOL_NETFS) {
+ src = malloc(strlen(pool->def->source.host.name) +
+ 1 + strlen(pool->def->source.dir) + 1);
+ strcpy(src, pool->def->source.host.name);
+ strcat(src, ":");
+ strcat(src, pool->def->source.dir);
+ } else {
+ src = strdup(pool->def->source.devices[0].path);
+ }
+ if (src == NULL) {
+ virStorageReportError(conn, VIR_ERR_NO_MEMORY, _("source"));
+ return -1;
+ }
+ mntargv[3] = src;
+
+ if (virRun(conn, (char**)mntargv, NULL) < 0) {
+ free(src);
+ return -1;
+ }
+ free(src);
+ return 0;
+}
+
+/**
+ * @conn connection to report errors against
+ * @pool storage pool to unmount
+ *
+ * Ensure that a FS storage pool is not mounted on its target location.
+ * If already unmounted, this is a no-op
+ *
+ * Returns 0 if successfully unmounted, -1 on error
+ */
+static int
+virStorageBackendFileSystemUnmount(virConnectPtr conn,
+ virStoragePoolObjPtr pool) {
+ const char *mntargv[3];
+ int ret;
+
+ if (pool->def->type == VIR_STORAGE_POOL_NETFS) {
+ if (pool->def->source.host.name == NULL) {
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("missing source host"));
+ return -1;
+ }
+ if (pool->def->source.dir == NULL) {
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("missing source dir"));
+ return -1;
+ }
+ } else {
+ if (pool->def->source.ndevice != 1) {
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("missing source device"));
+ return -1;
+ }
+ }
+
+ /* Short-circuit if already unmounted */
+ if ((ret = virStorageBackendFileSystemIsMounted(conn, pool)) != 1) {
+ if (ret < 0)
+ return -1;
+ else
+ return 0;
+ }
+
+ mntargv[0] = UMOUNT;
+ mntargv[1] = pool->def->target.path;
+ mntargv[2] = NULL;
+
+ if (virRun(conn, (char**)mntargv, NULL) < 0) {
+ return -1;
+ }
+ return 0;
+}
+#endif /* WITH_STORAGE_FS */
+
+
+/**
+ * @conn connection to report errors against
+ * @pool storage pool to start
+ *
+ * Starts a directory or FS based storage pool.
+ *
+ * - If it is a FS based pool, mounts the unlying source device on the pool
+ *
+ * Returns 0 on success, -1 on error
+ */
+#if WITH_STORAGE_FS
+static int
+virStorageBackendFileSystemStart(virConnectPtr conn,
+ virStoragePoolObjPtr pool)
+{
+ if (pool->def->type != VIR_STORAGE_POOL_DIR &&
+ virStorageBackendFileSystemMount(conn, pool) < 0)
+ return -1;
+
+ return 0;
+}
+#endif /* WITH_STORAGE_FS */
+
+
+/**
+ * @conn connection to report errors against
+ * @pool storage pool to build
+ *
+ * Build a directory or FS based storage pool.
+ *
+ * - If it is a FS based pool, mounts the unlying source device on the pool
+ *
+ * Returns 0 on success, -1 on error
+ */
+static int
+virStorageBackendFileSystemBuild(virConnectPtr conn,
+ virStoragePoolObjPtr pool,
+ unsigned int flags ATTRIBUTE_UNUSED)
+{
+ if (virFileMakePath(pool->def->target.path) < 0) {
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("cannot create path '%s': %s"),
+ pool->def->target.path, strerror(errno));
+ return -1;
+ }
+
+ return 0;
+}
+
+
+/**
+ * Iterate over the pool's directory and enumerate all disk images
+ * within it. This is non-recursive.
+ */
+static int
+virStorageBackendFileSystemRefresh(virConnectPtr conn,
+ virStoragePoolObjPtr pool)
+{
+ DIR *dir;
+ struct dirent *ent;
+ struct statvfs sb;
+
+ if (!(dir = opendir(pool->def->target.path))) {
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("cannot open path '%s': %s"),
+ pool->def->target.path, strerror(errno));
+ goto cleanup;
+ }
+
+ while ((ent = readdir(dir)) != NULL) {
+ virStorageVolDefPtr vol;
+ int ret;
+
+ vol = calloc(1, sizeof(virStorageVolDef));
+ if (vol == NULL) {
+ virStorageReportError(conn, VIR_ERR_NO_MEMORY,
+ _("volume"));
+ goto cleanup;
+ }
+
+ vol->name = strdup(ent->d_name);
+ if (vol->name == NULL) {
+ free(vol);
+ virStorageReportError(conn, VIR_ERR_NO_MEMORY,
+ _("volume name"));
+ goto cleanup;
+ }
+
+ vol->target.format = VIR_STORAGE_VOL_RAW; /* Real value is filled in during probe */
+ vol->target.path = malloc(strlen(pool->def->target.path) +
+ 1 + strlen(vol->name) + 1);
+ if (vol->target.path == NULL) {
+ free(vol->target.path);
+ free(vol);
+ virStorageReportError(conn, VIR_ERR_NO_MEMORY,
+ _("volume name"));
+ goto cleanup;
+ }
+ strcpy(vol->target.path, pool->def->target.path);
+ strcat(vol->target.path, "/");
+ strcat(vol->target.path, vol->name);
+ if ((vol->key = strdup(vol->target.path)) == NULL) {
+ free(vol->name);
+ free(vol->target.path);
+ free(vol);
+ virStorageReportError(conn, VIR_ERR_NO_MEMORY,
+ _("volume key"));
+ goto cleanup;
+ }
+
+ if ((ret = virStorageBackendProbeFile(conn, vol) < 0)) {
+ free(vol->key);
+ free(vol->name);
+ free(vol->target.path);
+ free(vol);
+ if (ret == -1)
+ goto cleanup;
+ else
+ /* Silently ignore non-regular files,
+ * eg '.' '..', 'lost+found' */
+ continue;
+ }
+
+ vol->next = pool->volumes;
+ pool->volumes = vol;
+ pool->nvolumes++;
+ continue;
+ }
+ closedir(dir);
+
+
+ if (statvfs(pool->def->target.path, &sb) < 0) {
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("cannot statvfs path '%s': %s"),
+ pool->def->target.path, strerror(errno));
+ return -1;
+ }
+ pool->def->capacity = ((unsigned long long)sb.f_frsize *
+ (unsigned long long)sb.f_blocks);
+ pool->def->available = ((unsigned long long)sb.f_bfree *
+ (unsigned long long)sb.f_bsize);
+ pool->def->allocation = pool->def->capacity - pool->def->available;
+
+ return 0;
+
+ cleanup:
+ closedir(dir);
+ virStoragePoolObjClearVols(pool);
+ return -1;
+}
+
+
+/**
+ * @conn connection to report errors against
+ * @pool storage pool to start
+ *
+ * Stops a directory or FS based storage pool.
+ *
+ * - If it is a FS based pool, unmounts the unlying source device on the pool
+ * - Releases all cached data about volumes
+ */
+#if WITH_STORAGE_FS
+static int
+virStorageBackendFileSystemStop(virConnectPtr conn,
+ virStoragePoolObjPtr pool)
+{
+ if (pool->def->type != VIR_STORAGE_POOL_DIR &&
+ virStorageBackendFileSystemUnmount(conn, pool) < 0)
+ return -1;
+
+ return 0;
+}
+#endif /* WITH_STORAGE_FS */
+
+
+/**
+ * @conn connection to report errors against
+ * @pool storage pool to build
+ *
+ * Build a directory or FS based storage pool.
+ *
+ * - If it is a FS based pool, mounts the unlying source device on the pool
+ *
+ * Returns 0 on success, -1 on error
+ */
+static int
+virStorageBackendFileSystemDelete(virConnectPtr conn,
+ virStoragePoolObjPtr pool,
+ unsigned int flags ATTRIBUTE_UNUSED)
+{
+ /* XXX delete all vols first ? */
+
+ if (unlink(pool->def->target.path) < 0) {
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("cannot unlink path '%s': %s"),
+ pool->def->target.path, strerror(errno));
+ return -1;
+ }
+
+ return 0;
+}
+
+
+/**
+ * Allocate a new file as a volume. This is either done directly
+ * for raw/sparse files, or by calling qemu-img/qcow-create for
+ * special kinds of files
+ */
+static int
+virStorageBackendFileSystemVolCreate(virConnectPtr conn,
+ virStoragePoolObjPtr pool,
+ virStorageVolDefPtr vol)
+{
+ int fd;
+
+ vol->target.path = malloc(strlen(pool->def->target.path) +
+ 1 + strlen(vol->name) + 1);
+ if (vol->target.path == NULL) {
+ virStorageReportError(conn, VIR_ERR_NO_MEMORY, _("target"));
+ return -1;
+ }
+ strcpy(vol->target.path, pool->def->target.path);
+ strcat(vol->target.path, "/");
+ strcat(vol->target.path, vol->name);
+ vol->key = strdup(vol->target.path);
+ if (vol->key == NULL) {
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("storage vol key"));
+ return -1;
+ }
+
+ if (vol->target.format == VIR_STORAGE_VOL_RAW) {
+ if ((fd = open(vol->target.path, O_RDWR | O_CREAT | O_EXCL,
+ vol->target.perms.mode)) < 0) {
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("cannot create path '%s': %s"),
+ vol->target.path, strerror(errno));
+ return -1;
+ }
+
+ /* Pre-allocate any data if requested */
+ /* XXX slooooooooooooooooow.
+ * Need to add in progress bars & bg thread somehow */
+ if (vol->allocation) {
+ unsigned long long remain = vol->allocation;
+ static const char const zeros[4096];
+ while (remain) {
+ int bytes = sizeof(zeros);
+ if (bytes > remain)
+ bytes = remain;
+ if ((bytes = write(fd, zeros, bytes)) < 0) {
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("cannot fill file '%s': %s"),
+ vol->target.path, strerror(errno));
+ unlink(vol->target.path);
+ close(fd);
+ return -1;
+ }
+ remain -= bytes;
+ }
+ }
+
+ /* Now seek to final size, possibly making the file sparse */
+ if (ftruncate(fd, vol->capacity) < 0) {
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("cannot extend file '%s': %s"),
+ vol->target.path, strerror(errno));
+ unlink(vol->target.path);
+ close(fd);
+ return -1;
+ }
+ } else if (vol->target.format == VIR_STORAGE_VOL_DIR) {
+ if (mkdir(vol->target.path, vol->target.perms.mode) < 0) {
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("cannot create path '%s': %s"),
+ vol->target.path, strerror(errno));
+ return -1;
+ }
+
+ if ((fd = open(vol->target.path, O_RDWR)) < 0) {
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("cannot read path '%s': %s"),
+ vol->target.path, strerror(errno));
+ return -1;
+ }
+ } else {
+#if HAVE_QEMU_IMG
+ const char *type;
+ char size[100];
+ const char *imgargv[7];
+
+ if ((type = virStorageBackendFileSystemVolFormatToString(conn,
+ vol->target.format)) == NULL) {
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("unknown storage vol type %d"),
+ vol->target.format);
+ return -1;
+ }
+
+ /* Size in KB */
+ snprintf(size, sizeof(size), "%llu", vol->capacity/1024);
+
+ imgargv[0] = QEMU_IMG;
+ imgargv[1] = "create";
+ imgargv[2] = "-f";
+ imgargv[3] = type;
+ imgargv[4] = vol->target.path;
+ imgargv[5] = size;
+ imgargv[6] = NULL;
+
+ if (virRun(conn, (char **)imgargv, NULL) < 0) {
+ unlink(vol->target.path);
+ return -1;
+ }
+
+ if ((fd = open(vol->target.path, O_RDONLY)) < 0) {
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("cannot read path '%s': %s"),
+ vol->target.path, strerror(errno));
+ unlink(vol->target.path);
+ return -1;
+ }
+#elif HAVE_QCOW_CREATE
+ /*
+ * Xen removed the fully-functional qemu-img, and replaced it
+ * with a partially functional qcow-create. Go figure ??!?
+ */
+ char size[100];
+ const char *imgargv[4];
+
+ if (vol->target.format != VIR_STORAGE_VOL_QCOW2) {
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("unsupported storage vol type %d"),
+ vol->target.format);
+ return -1;
+ }
+
+ /* Size in MB - yes different units to qemu-img :-( */
+ snprintf(size, sizeof(size), "%llu", vol->capacity/1024/1024);
+
+ imgargv[0] = QCOW_CREATE;
+ imgargv[1] = size;
+ imgargv[2] = vol->target.path;
+ imgargv[3] = NULL;
+
+ if (virRun(conn, (char **)imgargv, NULL) < 0) {
+ unlink(vol->target.path);
+ return -1;
+ }
+
+ if ((fd = open(vol->target.path, O_RDONLY)) < 0) {
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("cannot read path '%s': %s"),
+ vol->target.path, strerror(errno));
+ unlink(vol->target.path);
+ return -1;
+ }
+#else
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("creation of non-raw images is not supported without qemu-img"));
+ return -1;
+#endif
+ }
+
+ /* We can only chown/grp if root */
+ if (getuid() == 0) {
+ if (fchown(fd, vol->target.perms.uid, vol->target.perms.gid) < 0) {
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("cannot set file owner '%s': %s"),
+ vol->target.path, strerror(errno));
+ unlink(vol->target.path);
+ close(fd);
+ return -1;
+ }
+ }
+ if (fchmod(fd, vol->target.perms.mode) < 0) {
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("cannot set file mode '%s': %s"),
+ vol->target.path, strerror(errno));
+ unlink(vol->target.path);
+ close(fd);
+ return -1;
+ }
+
+ /* Refresh allocation / permissions info, but not capacity */
+ if (virStorageBackendUpdateVolInfoFD(conn, vol, fd, 0) < 0) {
+ unlink(vol->target.path);
+ close(fd);
+ return -1;
+ }
+
+ if (close(fd) < 0) {
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("cannot close file '%s': %s"),
+ vol->target.path, strerror(errno));
+ unlink(vol->target.path);
+ return -1;
+ }
+
+ return 0;
+}
+
+
+/**
+ * Remove a volume - just unlinks for now
+ */
+static int
+virStorageBackendFileSystemVolDelete(virConnectPtr conn,
+ virStoragePoolObjPtr pool ATTRIBUTE_UNUSED,
+ virStorageVolDefPtr vol,
+ unsigned int flags ATTRIBUTE_UNUSED)
+{
+ if (unlink(vol->target.path) < 0) {
+ /* Silently ignore failures where the vol has already gone away */
+ if (errno != ENOENT) {
+ virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+ _("cannot unlink file '%s': %s"),
+ vol->target.path, strerror(errno));
+ return -1;
+ }
+ }
+ return 0;
+}
+
+
+/**
+ * Update info about a volume's capacity/allocation
+ */
+static int
+virStorageBackendFileSystemVolRefresh(virConnectPtr conn,
+ virStoragePoolObjPtr pool ATTRIBUTE_UNUSED,
+ virStorageVolDefPtr vol)
+{
+ /* Refresh allocation / permissions info in case its changed */
+ return virStorageBackendUpdateVolInfo(conn, vol, 0);
+}
+
+virStorageBackend virStorageBackendDirectory = {
+ .type = VIR_STORAGE_POOL_DIR,
+
+ .buildPool = virStorageBackendFileSystemBuild,
+ .refreshPool = virStorageBackendFileSystemRefresh,
+ .deletePool = virStorageBackendFileSystemDelete,
+ .createVol = virStorageBackendFileSystemVolCreate,
+ .refreshVol = virStorageBackendFileSystemVolRefresh,
+ .deleteVol = virStorageBackendFileSystemVolDelete,
+
+ .volOptions = {
+ .formatFromString = virStorageBackendFileSystemVolFormatFromString,
+ .formatToString = virStorageBackendFileSystemVolFormatToString,
+ },
+ .volType = VIR_STORAGE_VOL_FILE,
+};
+
+#if WITH_STORAGE_FS
+virStorageBackend virStorageBackendFileSystem = {
+ .type = VIR_STORAGE_POOL_FS,
+
+ .buildPool = virStorageBackendFileSystemBuild,
+ .startPool = virStorageBackendFileSystemStart,
+ .refreshPool = virStorageBackendFileSystemRefresh,
+ .stopPool = virStorageBackendFileSystemStop,
+ .deletePool = virStorageBackendFileSystemDelete,
+ .createVol = virStorageBackendFileSystemVolCreate,
+ .refreshVol = virStorageBackendFileSystemVolRefresh,
+ .deleteVol = virStorageBackendFileSystemVolDelete,
+
+ .poolOptions = {
+ .flags = (VIR_STORAGE_BACKEND_POOL_SOURCE_DEVICE),
+ .formatFromString = virStorageBackendFileSystemPoolFormatFromString,
+ .formatToString = virStorageBackendFileSystemPoolFormatToString,
+ },
+ .volOptions = {
+ .formatFromString = virStorageBackendFileSystemVolFormatFromString,
+ .formatToString = virStorageBackendFileSystemVolFormatToString,
+ },
+ .volType = VIR_STORAGE_VOL_FILE,
+};
+virStorageBackend virStorageBackendNetFileSystem = {
+ .type = VIR_STORAGE_POOL_NETFS,
+
+ .buildPool = virStorageBackendFileSystemBuild,
+ .startPool = virStorageBackendFileSystemStart,
+ .refreshPool = virStorageBackendFileSystemRefresh,
+ .stopPool = virStorageBackendFileSystemStop,
+ .deletePool = virStorageBackendFileSystemDelete,
+ .createVol = virStorageBackendFileSystemVolCreate,
+ .refreshVol = virStorageBackendFileSystemVolRefresh,
+ .deleteVol = virStorageBackendFileSystemVolDelete,
+
+ .poolOptions = {
+ .flags = (VIR_STORAGE_BACKEND_POOL_SOURCE_HOST |
+ VIR_STORAGE_BACKEND_POOL_SOURCE_DIR),
+ .formatFromString = virStorageBackendFileSystemNetPoolFormatFromString,
+ .formatToString = virStorageBackendFileSystemNetPoolFormatToString,
+ },
+ .volOptions = {
+ .formatFromString = virStorageBackendFileSystemVolFormatFromString,
+ .formatToString = virStorageBackendFileSystemVolFormatToString,
+ },
+ .volType = VIR_STORAGE_VOL_FILE,
+};
+#endif /* WITH_STORAGE_FS */
+
+/*
+ * vim: set tabstop=4:
+ * vim: set shiftwidth=4:
+ * vim: set expandtab:
+ */
+/*
+ * Local variables:
+ * indent-tabs-mode: nil
+ * c-indent-level: 4
+ * c-basic-offset: 4
+ * tab-width: 4
+ * End:
+ */
projects / libvirt.git / commitdiff