Fix /sys to /dev node name translation

linux/drivers/base/core.c: device_get_devnode() defines a translation of
'!' in sysfs nodes to '/' in /dev nodes. The same translation has to be
done to properly support device nodes with slash (e. g. device nodes of
cciss driver and several other drivers).

Introduce new helper sysfs_devname_to_devno() and use it where
appropriate.

Fixes for example lsblk -f on devices using cciss driver.

Signed-off-by: Stanislav Brabec <sbrabec@suse.cz>

4 files changed, 22 insertions, 0 deletions

diff --git a/include/sysfs.h b/include/sysfs.h
index 1de624aad..4564124df 100644
--- a/include/sysfs.h
+++ b/include/sysfs.h
@@ -91,4 +91,22 @@ extern int sysfs_scsi_host_is(struct sysfs_cxt *cxt, const char *type);
 extern int sysfs_scsi_has_attribute(struct sysfs_cxt *cxt, const char *attr);
 extern int sysfs_scsi_path_contains(struct sysfs_cxt *cxt, const char *pattern);
 
+/**
+ * sysfs_devname_to_dev_name:
+ * @name: devname to be converted in place
+ *
+ * Linux kernel linux/drivers/base/core.c: device_get_devnode()
+ * defines a replacement of '!' in the /sys device name by '/' in the
+ * /dev device name. This helper replaces all ocurrences of '!' in
+ * @name by '/'.
+ */
+static inline void sysfs_devname_to_dev_name (char *name)
+{
+	char *c;
+
+	if (name)
+		while ((c = strchr(name, '!')))
+			c[0] = '/';
+}
+
 #endif /* UTIL_LINUX_SYSFS_H */
diff --git a/lib/sysfs.c b/lib/sysfs.c
index 759d97be6..8417d2d76 100644
--- a/lib/sysfs.c
+++ b/lib/sysfs.c
@@ -131,6 +131,7 @@ char *sysfs_devno_to_devpath(dev_t devno, char *buf, size_t bufsiz)
 		return NULL;
 
 	/* create the final "/dev/<name>" string */
+	sysfs_devname_to_dev_name(name);
 	memmove(buf + 5, name, sz + 1);
 	memcpy(buf, "/dev/", 5);
 
@@ -789,6 +790,7 @@ int sysfs_devno_to_wholedisk(dev_t dev, char *diskname,
         if (!name)
             goto err;
 
+	sysfs_devname_to_dev_name(name);
         if (diskname && len) {
             strncpy(diskname, name, len);
             diskname[len - 1] = '\0';
diff --git a/libblkid/src/devno.c b/libblkid/src/devno.c
index f4a36e4f5..3c082271b 100644
--- a/libblkid/src/devno.c
+++ b/libblkid/src/devno.c
@@ -208,6 +208,7 @@ static char *scandev_devno_to_devpath(dev_t devno)
 			new_list = NULL;
 		}
 	}
+	sysfs_devname_to_dev_name(devname);
 	free_dirlist(&list);
 	free_dirlist(&new_list);
 
diff --git a/misc-utils/lsblk.c b/misc-utils/lsblk.c
index 1b4ffc128..d826c778f 100644
--- a/misc-utils/lsblk.c
+++ b/misc-utils/lsblk.c
@@ -421,6 +421,7 @@ static char *get_device_path(struct blkdev_cxt *cxt)
 		return canonicalize_dm_name(cxt->name);
 
 	snprintf(path, sizeof(path), "/dev/%s", cxt->name);
+	sysfs_devname_to_dev_name(path);
 	return xstrdup(path);
 }