From: Karel Zak <kzak@redhat.com>
Date: Wed, 25 Apr 2012 07:49:50 +0000 (+0200)
Subject: libmount: add mnt_table_find_devno()
X-Git-Tag: v2.22-rc1~484
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=677ff053f63f45fcc88d29ea20f8fcb21d54acff;p=thirdparty%2Futil-linux.git

libmount: add mnt_table_find_devno()

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

diff --git a/libmount/docs/libmount-sections.txt b/libmount/docs/libmount-sections.txt
index c29232374d..1b9597387c 100644
--- a/libmount/docs/libmount-sections.txt
+++ b/libmount/docs/libmount-sections.txt
@@ -267,6 +267,7 @@ mnt_reset_table
 mnt_new_table_from_dir
 mnt_new_table_from_file
 mnt_table_add_fs
+mnt_table_find_devno
 mnt_table_find_next_fs
 mnt_table_find_pair
 mnt_table_find_source
diff --git a/libmount/src/libmount.h.in b/libmount/src/libmount.h.in
index c88722a9d7..5c5edbba60 100644
--- a/libmount/src/libmount.h.in
+++ b/libmount/src/libmount.h.in
@@ -335,6 +335,8 @@ extern struct libmnt_fs *mnt_table_find_source(struct libmnt_table *tb,
 extern struct libmnt_fs *mnt_table_find_pair(struct libmnt_table *tb,
 				const char *source,
 				const char *target, int direction);
+extern struct libmnt_fs *mnt_table_find_devno(struct libmnt_table *tb,
+				dev_t devno, int direction);
 
 extern int mnt_table_find_next_fs(struct libmnt_table *tb,
 			struct libmnt_iter *itr,
diff --git a/libmount/src/libmount.sym b/libmount/src/libmount.sym
index 4db8b12c6d..ca7a305cc6 100644
--- a/libmount/src/libmount.sym
+++ b/libmount/src/libmount.sym
@@ -235,6 +235,7 @@ global:
 	mnt_context_is_loopdel;
 	mnt_context_is_nocanonicalize;
 	mnt_context_is_nohelpers;
+	mnt_table_find_devno;
 	mnt_table_parse_swaps;
 	mnt_get_swaps_path;
 	mnt_fs_get_swaptype;
diff --git a/libmount/src/tab.c b/libmount/src/tab.c
index b2662d5ae1..9c41c99a2c 100644
--- a/libmount/src/tab.c
+++ b/libmount/src/tab.c
@@ -703,6 +703,40 @@ struct libmnt_fs *mnt_table_find_pair(struct libmnt_table *tb, const char *sourc
 	return NULL;
 }
 
+/**
+ * mnt_table_find_devno
+ * @tb: /proc/self/mountinfo
+ * @devno: device number
+ * @direction: MNT_ITER_{FORWARD,BACKWARD}
+ *
+ * Note that zero could be valid device number for root pseudo filesystem (e.g.
+ * tmpfs).
+ *
+ * Returns: a tab entry or NULL.
+ */
+struct libmnt_fs *mnt_table_find_devno(struct libmnt_table *tb,
+				       dev_t devno, int direction)
+{
+	struct libmnt_fs *fs = NULL;
+	struct libmnt_iter itr;
+
+	assert(tb);
+
+	if (!tb)
+		return NULL;
+
+	DBG(TAB, mnt_debug_h(tb, "lookup DEVNO: %d", (int) devno));
+
+	mnt_reset_iter(&itr, direction);
+
+	while(mnt_table_next_fs(tb, &itr, &fs) == 0) {
+		if (mnt_fs_get_devno(fs) == devno)
+			return fs;
+	}
+
+	return NULL;
+}
+
 /*
  * tb: /proc/self/mountinfo
  * fs: filesystem