From: Karel Zak <kzak@redhat.com>
Date: Mon, 14 May 2007 22:52:07 +0000 (+0200)
Subject: mount: fsprobe: add libvolume_id support
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c4e33ad025411157535b3eda347c20a03db47c62;p=util-linux

mount: fsprobe: add libvolume_id support

Signed-off-by: Matthias Koenig <mkoenig@suse.de>
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Karel Zak <kzak@redhat.com>
---

diff --git a/mount/Makefile.am b/mount/Makefile.am
index fb330133..fa60830d 100644
--- a/mount/Makefile.am
+++ b/mount/Makefile.am
@@ -44,6 +44,15 @@ if HAVE_SELINUX
 mount_LDADD += -lselinux
 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 00000000..8c13987a
--- /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 8ed5a11b..be6e5376 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 9093b10e..d726d063 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 */