[libvirt] [PATCH 14/15] Move loop device setup code into virfile.{c, h}
Daniel P. Berrange
berrange at redhat.com
Tue Jul 3 15:58:53 UTC 2012
From: "Daniel P. Berrange" <berrange at redhat.com>
While it is not currently used elsewhere in libvirt, the code
for finding a free loop device & associating a file with it
is not LXC specific. Move it into the viffile.{c,h} file where
potentially shared code is more commonly kept.
Signed-off-by: Daniel P. Berrange <berrange at redhat.com>
---
src/libvirt_private.syms | 1 +
src/lxc/lxc_controller.c | 112 ++-----------------------------------
src/util/virfile.c | 138 ++++++++++++++++++++++++++++++++++++++++++++++
src/util/virfile.h | 3 +
4 files changed, 147 insertions(+), 107 deletions(-)
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 2fe5068..6625fc6 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -1243,6 +1243,7 @@ virDomainListSnapshots;
# virfile.h
+virFileLoopDeviceAssociate;
virFileClose;
virFileDirectFdFlag;
virFileWrapperFdClose;
diff --git a/src/lxc/lxc_controller.c b/src/lxc/lxc_controller.c
index 05ca52a..27b51b4 100644
--- a/src/lxc/lxc_controller.c
+++ b/src/lxc/lxc_controller.c
@@ -39,8 +39,6 @@
#include <getopt.h>
#include <sys/mount.h>
#include <locale.h>
-#include <linux/loop.h>
-#include <dirent.h>
#include <grp.h>
#include <sys/stat.h>
#include <time.h>
@@ -337,108 +335,15 @@ static int virLXCControllerValidateConsoles(virLXCControllerPtr ctrl)
}
-static int lxcGetLoopFD(char **dev_name)
-{
- int fd = -1;
- DIR *dh = NULL;
- struct dirent *de;
- char *looppath;
- struct loop_info64 lo;
-
- VIR_DEBUG("Looking for loop devices in /dev");
-
- if (!(dh = opendir("/dev"))) {
- virReportSystemError(errno, "%s",
- _("Unable to read /dev"));
- goto cleanup;
- }
-
- while ((de = readdir(dh)) != NULL) {
- if (!STRPREFIX(de->d_name, "loop"))
- continue;
-
- if (virAsprintf(&looppath, "/dev/%s", de->d_name) < 0) {
- virReportOOMError();
- goto cleanup;
- }
-
- VIR_DEBUG("Checking up on device %s", looppath);
- if ((fd = open(looppath, O_RDWR)) < 0) {
- virReportSystemError(errno,
- _("Unable to open %s"), looppath);
- goto cleanup;
- }
-
- if (ioctl(fd, LOOP_GET_STATUS64, &lo) < 0) {
- /* Got a free device, return the fd */
- if (errno == ENXIO)
- goto cleanup;
-
- VIR_FORCE_CLOSE(fd);
- virReportSystemError(errno,
- _("Unable to get loop status on %s"),
- looppath);
- goto cleanup;
- }
-
- /* Oh well, try the next device */
- VIR_FORCE_CLOSE(fd);
- VIR_FREE(looppath);
- }
-
- lxcError(VIR_ERR_INTERNAL_ERROR, "%s",
- _("Unable to find a free loop device in /dev"));
-
-cleanup:
- if (fd != -1) {
- VIR_DEBUG("Got free loop device %s %d", looppath, fd);
- *dev_name = looppath;
- } else {
- VIR_DEBUG("No free loop devices available");
- VIR_FREE(looppath);
- }
- if (dh)
- closedir(dh);
- return fd;
-}
-
-static int lxcSetupLoopDevice(virDomainFSDefPtr fs)
+static int virLXCControllerSetupLoopDevice(virDomainFSDefPtr fs)
{
int lofd = -1;
- int fsfd = -1;
- struct loop_info64 lo;
char *loname = NULL;
- int ret = -1;
- if ((lofd = lxcGetLoopFD(&loname)) < 0)
- return -1;
- memset(&lo, 0, sizeof(lo));
- lo.lo_flags = LO_FLAGS_AUTOCLEAR;
-
- if ((fsfd = open(fs->src, O_RDWR)) < 0) {
- virReportSystemError(errno,
- _("Unable to open %s"), fs->src);
- goto cleanup;
- }
-
- if (ioctl(lofd, LOOP_SET_FD, fsfd) < 0) {
- virReportSystemError(errno,
- _("Unable to attach %s to loop device"),
- fs->src);
- goto cleanup;
- }
-
- if (ioctl(lofd, LOOP_SET_STATUS64, &lo) < 0) {
- virReportSystemError(errno, "%s",
- _("Unable to mark loop device as autoclear"));
-
- if (ioctl(lofd, LOOP_CLR_FD, 0) < 0)
- VIR_WARN("Unable to detach %s from loop device", fs->src);
- goto cleanup;
- }
+ if ((lofd = virFileLoopDeviceAssociate(fs->src, &loname)) < 0)
+ return -1;
- VIR_DEBUG("Attached loop device %s %d to %s", fs->src, lofd, loname);
/*
* We now change it into a block device type, so that
* the rest of container setup 'just works'
@@ -448,14 +353,7 @@ static int lxcSetupLoopDevice(virDomainFSDefPtr fs)
fs->src = loname;
loname = NULL;
- ret = 0;
-
-cleanup:
- VIR_FREE(loname);
- VIR_FORCE_CLOSE(fsfd);
- if (ret == -1)
- VIR_FORCE_CLOSE(lofd);
- return lofd;
+ return 0;
}
@@ -470,7 +368,7 @@ static int virLXCControllerSetupLoopDevices(virLXCControllerPtr ctrl)
if (ctrl->def->fss[i]->type != VIR_DOMAIN_FS_TYPE_FILE)
continue;
- fd = lxcSetupLoopDevice(ctrl->def->fss[i]);
+ fd = virLXCControllerSetupLoopDevice(ctrl->def->fss[i]);
if (fd < 0)
goto cleanup;
diff --git a/src/util/virfile.c b/src/util/virfile.c
index 6c69217..8387ae9 100644
--- a/src/util/virfile.c
+++ b/src/util/virfile.c
@@ -30,6 +30,12 @@
#include <fcntl.h>
#include <sys/stat.h>
#include <unistd.h>
+#include <dirent.h>
+
+#ifdef __linux__
+# include <linux/loop.h>
+# include <sys/ioctl.h>
+#endif
#include "command.h"
#include "configmake.h"
@@ -493,3 +499,135 @@ int virFileUpdatePerm(const char *path,
return 0;
}
+
+
+#ifdef __linux__
+static int virFileLoopDeviceOpen(char **dev_name)
+{
+ int fd = -1;
+ DIR *dh = NULL;
+ struct dirent *de;
+ char *looppath;
+ struct loop_info64 lo;
+
+ VIR_DEBUG("Looking for loop devices in /dev");
+
+ if (!(dh = opendir("/dev"))) {
+ virReportSystemError(errno, "%s",
+ _("Unable to read /dev"));
+ goto cleanup;
+ }
+
+ while ((de = readdir(dh)) != NULL) {
+ if (!STRPREFIX(de->d_name, "loop"))
+ continue;
+
+ if (virAsprintf(&looppath, "/dev/%s", de->d_name) < 0) {
+ virReportOOMError();
+ goto cleanup;
+ }
+
+ VIR_DEBUG("Checking up on device %s", looppath);
+ if ((fd = open(looppath, O_RDWR)) < 0) {
+ virReportSystemError(errno,
+ _("Unable to open %s"), looppath);
+ goto cleanup;
+ }
+
+ if (ioctl(fd, LOOP_GET_STATUS64, &lo) < 0) {
+ /* Got a free device, return the fd */
+ if (errno == ENXIO)
+ goto cleanup;
+
+ VIR_FORCE_CLOSE(fd);
+ virReportSystemError(errno,
+ _("Unable to get loop status on %s"),
+ looppath);
+ goto cleanup;
+ }
+
+ /* Oh well, try the next device */
+ VIR_FORCE_CLOSE(fd);
+ VIR_FREE(looppath);
+ }
+
+ virFileError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("Unable to find a free loop device in /dev"));
+
+cleanup:
+ if (fd != -1) {
+ VIR_DEBUG("Got free loop device %s %d", looppath, fd);
+ *dev_name = looppath;
+ } else {
+ VIR_DEBUG("No free loop devices available");
+ VIR_FREE(looppath);
+ }
+ if (dh)
+ closedir(dh);
+ return fd;
+}
+
+
+int virFileLoopDeviceAssociate(const char *file,
+ char **dev)
+{
+ int lofd = -1;
+ int fsfd = -1;
+ struct loop_info64 lo;
+ char *loname = NULL;
+ int ret = -1;
+
+ if ((lofd = virFileLoopDeviceOpen(&loname)) < 0)
+ return -1;
+
+ memset(&lo, 0, sizeof(lo));
+ lo.lo_flags = LO_FLAGS_AUTOCLEAR;
+
+ if ((fsfd = open(file, O_RDWR)) < 0) {
+ virReportSystemError(errno,
+ _("Unable to open %s"), file);
+ goto cleanup;
+ }
+
+ if (ioctl(lofd, LOOP_SET_FD, fsfd) < 0) {
+ virReportSystemError(errno,
+ _("Unable to attach %s to loop device"),
+ file);
+ goto cleanup;
+ }
+
+ if (ioctl(lofd, LOOP_SET_STATUS64, &lo) < 0) {
+ virReportSystemError(errno, "%s",
+ _("Unable to mark loop device as autoclear"));
+
+ if (ioctl(lofd, LOOP_CLR_FD, 0) < 0)
+ VIR_WARN("Unable to detach %s from loop device", file);
+ goto cleanup;
+ }
+
+ VIR_DEBUG("Attached loop device %s %d to %s", file, lofd, loname);
+ *dev = loname;
+ loname = NULL;
+
+ ret = 0;
+
+cleanup:
+ VIR_FREE(loname);
+ VIR_FORCE_CLOSE(fsfd);
+ if (ret == -1)
+ VIR_FORCE_CLOSE(lofd);
+ return lofd;
+}
+
+#else /* __linux__ */
+
+int virFileLoopDeviceAssociate(const char *file,
+ char **dev)
+{
+ virReportSystemError(ENOSYS,
+ _("Unable to associate file %s with loop device"),
+ file);
+ return -1;m
+}
+
+#endif /* __linux__ */
diff --git a/src/util/virfile.h b/src/util/virfile.h
index fb8109b..101953a 100644
--- a/src/util/virfile.h
+++ b/src/util/virfile.h
@@ -105,4 +105,7 @@ int virFileUpdatePerm(const char *path,
mode_t mode_remove,
mode_t mode_add);
+int virFileLoopDeviceAssociate(const char *file,
+ char **dev);
+
#endif /* __VIR_FILES_H */
--
1.7.10.4
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