Thread (24 messages) 24 messages, 5 authors, 2023-01-19
STALE1278d
Revisions (3)
  1. v1 current
  2. v2 [diff vs current]
  3. v3 [diff vs current]

[PATCH 5/9] Add helpers to determine whether directories or files are soft links

From: Mateusz Grzonka <hidden>
Date: 2022-09-07 13:14:50
Subsystem: the rest · Maintainer: Linus Torvalds

Signed-off-by: Mateusz Grzonka <redacted>
---
 mdadm.h |  3 +++
 util.c  | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 49 insertions(+)
diff --git a/mdadm.h b/mdadm.h
index 09915a00..9183ee70 100644
--- a/mdadm.h
+++ b/mdadm.h
@@ -1707,6 +1707,9 @@ extern int cluster_get_dlmlock(void);
 extern int cluster_release_dlmlock(void);
 extern void set_dlm_hooks(void);
 
+extern bool is_directory(const char *path);
+extern bool is_file(const char *path);
+
 #define _ROUND_UP(val, base)	(((val) + (base) - 1) & ~(base - 1))
 #define ROUND_UP(val, base)	_ROUND_UP(val, (typeof(val))(base))
 #define ROUND_UP_PTR(ptr, base)	((typeof(ptr)) \
diff --git a/util.c b/util.c
index cc94f96e..97926f19 100644
--- a/util.c
+++ b/util.c
@@ -2375,3 +2375,49 @@ out:
 	close(fd_zero);
 	return ret;
 }
+
+/**
+ * is_directory() - Checks if directory provided by path is indeed a regular directory.
+ * @path: directory path to be checked
+ *
+ * Doesn't accept symlinks.
+ *
+ * Return: true if is a directory, false if not
+ */
+bool is_directory(const char *path)
+{
+	struct stat st;
+
+	if (lstat(path, &st) != 0) {
+		pr_err("%s: %s\n", strerror(errno), path);
+		return false;
+	}
+
+	if (!S_ISDIR(st.st_mode))
+		return false;
+
+	return true;
+}
+
+/**
+ * is_file() - Checks if file provided by path is indeed a regular file.
+ * @path: file path to be checked
+ *
+ * Doesn't accept symlinks.
+ *
+ * Return: true if is  a file, false if not
+ */
+bool is_file(const char *path)
+{
+	struct stat st;
+
+	if (lstat(path, &st) != 0) {
+		pr_err("%s: %s\n", strerror(errno), path);
+		return false;
+	}
+
+	if (!S_ISREG(st.st_mode))
+		return false;
+
+	return true;
+}
-- 
2.26.2
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