From: Karel Zak <kzak@redhat.com>
Date: Tue, 16 Oct 2018 13:52:13 +0000 (+0200)
Subject: lib/sysfs: add function to detect partitioned devices
X-Git-Tag: v2.34-rc1~219
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=93c687d895752582bd95ef52a53684b346f2cc70;p=thirdparty%2Futil-linux.git

lib/sysfs: add function to detect partitioned devices

Signed-off-by: Karel Zak <kzak@redhat.com>
---

diff --git a/include/sysfs.h b/include/sysfs.h
index 74f69fb9cb..edda8ca991 100644
--- a/include/sysfs.h
+++ b/include/sysfs.h
@@ -97,6 +97,7 @@ dev_t sysfs_devname_to_devno(const char *name);
 dev_t __sysfs_devname_to_devno(const char *prefix, const char *name, const char *parent);
 char *sysfs_devno_to_devpath(dev_t devno, char *buf, size_t bufsiz);
 char *sysfs_devno_to_devname(dev_t devno, char *buf, size_t bufsiz);
+int sysfs_devno_count_partitions(dev_t devno);
 
 int sysfs_blkdev_scsi_get_hctl(struct path_cxt *pc, int *h, int *c, int *t, int *l);
 char *sysfs_blkdev_scsi_host_strdup_attribute(struct path_cxt *pc,
diff --git a/lib/sysfs.c b/lib/sysfs.c
index 626451bddb..6916c2584d 100644
--- a/lib/sysfs.c
+++ b/lib/sysfs.c
@@ -999,6 +999,20 @@ char *sysfs_devno_to_devname(dev_t devno, char *buf, size_t bufsiz)
 	return res;
 }
 
+int sysfs_devno_count_partitions(dev_t devno)
+{
+	struct path_cxt *pc = ul_new_sysfs_path(devno, NULL, NULL);
+	int n = 0;
+
+	if (pc) {
+		char buf[PATH_MAX + 1];
+		char *name = sysfs_blkdev_get_name(pc, buf, sizeof(buf));
+
+		n = sysfs_blkdev_count_partitions(pc, name);
+		ul_unref_path(pc);
+	}
+	return n;
+}
 
 
 #ifdef TEST_PROGRAM_SYSFS