Signed-off-by: Matthias Koenig <mkoenig@xxxxxxx>
Signed-off-by: Kay Sievers <kay.sievers@xxxxxxxx>
Signed-off-by: Karel Zak <kzak@xxxxxxxxxx>
---
mount/Makefile.am | 9 +++
mount/fsprobe_volumeid.c | 123 ++++++++++++++++++++++++++++++++++++++++++++++
mount/mount.8 | 5 +-
mount/mount_paths.h | 4 ++
4 files changed, 138 insertions(+), 3 deletions(-)
diff --git a/mount/Makefile.am b/mount/Makefile.am
index e61261f..4562b2d 100644
--- a/mount/Makefile.am
+++ b/mount/Makefile.am
@@ -37,6 +37,15 @@ umount_LDADD += -lblkid -luuid
swapon_LDADD = -lblkid -luuid
endif
+if HAVE_VOLUME_ID
+mount_SOURCES += fsprobe_volumeid.c
+umount_SOURCES += fsprobe_volumeid.c
+swapon_SOURCES += fsprobe_volumeid.c
+mount_LDADD += -lvolume_id
+umount_LDADD += -lvolume_id
+swapon_LDADD = -lvolume_id
+endif
+
if HAVE_PIVOT_ROOT
sbin_PROGRAMS += pivot_root
man_MANS += pivot_root.8
diff --git a/mount/fsprobe_volumeid.c b/mount/fsprobe_volumeid.c
new file mode 100644
index 0000000..8c13987
--- /dev/null
+++ b/mount/fsprobe_volumeid.c
@@ -0,0 +1,123 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <stddef.h>
+#include <sys/mount.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <libvolume_id.h>
+
+#include "fsprobe.h"
+#include "realpath.h"
+#include "mount_paths.h"
+#include "sundries.h"
+
+enum probe_type {
+ VOLUME_ID_NONE,
+ VOLUME_ID_LABEL,
+ VOLUME_ID_UUID,
+ VOLUME_ID_TYPE,
+};
+
+static char *probe(const char *device, enum probe_type type)
+{
+ int fd;
+ uint64_t size;
+ struct volume_id *id;
+ char *value = NULL;
+
+ fd = open(device, O_RDONLY);
+ if (fd < 0)
+ return NULL;
+
+ id = volume_id_open_fd(fd);
+ if (!id)
+ return NULL;
+
+ /* TODO: use blkdev_get_size() */
+ if (ioctl(fd, BLKGETSIZE64, &size) != 0)
+ size = 0;
+
+ if (volume_id_probe_all(id, 0, size) == 0) {
+ switch(type) {
+ case VOLUME_ID_LABEL:
+ value = xstrdup(id->label);
+ break;
+ case VOLUME_ID_UUID:
+ value = xstrdup(id->uuid);
+ break;
+ case VOLUME_ID_TYPE:
+ value = xstrdup(id->type);
+ break;
+ default:
+ break;
+ }
+ }
+
+ volume_id_close(id);
+ return value;
+}
+
+void
+fsprobe_init(void)
+{
+}
+
+void
+fsprobe_exit(void)
+{
+}
+
+int
+fsprobe_known_fstype(const char *fstype)
+{
+ /* TODO
+ if (volume_id_get_prober_by_type(fstype) != NULL)
+ return 1;
+ */
+ return 0;
+}
+
+const char *
+fsprobe_get_uuid_by_devname(const char *devname)
+{
+ return probe(devname, VOLUME_ID_UUID);
+}
+
+const char *
+fsprobe_get_label_by_devname(const char *devname)
+{
+ return probe(devname, VOLUME_ID_LABEL);
+}
+
+const char *
+fsprobe_get_fstype_by_devname(const char *devname)
+{
+ return probe(devname, VOLUME_ID_TYPE);
+}
+
+const char *
+fsprobe_get_devname_by_uuid(const char *uuid)
+{
+ char dev[PATH_MAX];
+
+ if (!uuid)
+ return NULL;
+
+ snprintf(dev, sizeof(dev), PATH_DEV_BYUUID "/%s", uuid);
+ return canonicalize(dev);
+}
+
+const char *
+fsprobe_get_devname_by_label(const char *label)
+{
+ char dev[PATH_MAX];
+
+ if (!label)
+ return NULL;
+
+ snprintf(dev, sizeof(dev), PATH_DEV_BYLABEL "/%s", label);
+ return canonicalize(dev);
+}
+
diff --git a/mount/mount.8 b/mount/mount.8
index 8ed5a11..be6e537 100644
--- a/mount/mount.8
+++ b/mount/mount.8
@@ -477,9 +477,8 @@ If no
option is given, or if the
.B auto
type is specified, mount will try to guess the desired type.
-If mount was compiled with the blkid library, the guessing is done
-by this library. Otherwise, mount guesses itself by probing the
-superblock; if that does not turn up anything that looks familiar,
+Mount uses the blkid or volume_id library for guessing the filesystem
+type; if that does not turn up anything that looks familiar,
mount will try to read the file
.IR /etc/filesystems ,
or, if that does not exist,
diff --git a/mount/mount_paths.h b/mount/mount_paths.h
index 9093b10..d726d06 100644
--- a/mount/mount_paths.h
+++ b/mount/mount_paths.h
@@ -15,4 +15,8 @@
#define ETC_FILESYSTEMS "/etc/filesystems"
#define PROC_FILESYSTEMS "/proc/filesystems"
+/* udev paths */
+#define PATH_DEV_BYLABEL "/dev/disk/by-label"
+#define PATH_DEV_BYUUID "/dev/disk/by-uuid"
+
#endif /* MOUNT_PATHS_H */
--
1.5.0.6
-
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