Add helpers to determine whether directories or files are soft links

Signed-off-by: Mateusz Grzonka <mateusz.grzonka@intel.com>
Acked-by: Coly Li <colyli@suse.de>
Signed-off-by: Jes Sorensen <jes@trained-monkey.org>

diff --git a/mdadm.h b/mdadm.h
index 13f8b4cb5a6b0ff9d548322b11aa78f8de2f969f..1674ce1307b2455c3fde644880d74ee06a10603f 100644 (file)
--- a/mdadm.h
+++ b/mdadm.h
@@ -1777,6 +1777,8 @@ extern void set_dlm_hooks(void);
 #define MSEC_TO_NSEC(msec) ((msec) * 1000000)
 #define USEC_TO_NSEC(usec) ((usec) * 1000)
 extern void sleep_for(unsigned int sec, long nsec, bool wake_after_interrupt);
+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))

diff --git a/util.c b/util.c
index 8c7f3fd5b7ac52aa68cc46bc8e93ea9e703a6da2..7fc881bfad3f1b69715d58e6a7b216cfbde8e59d 100644 (file)
--- a/util.c
+++ b/util.c
@@ -2401,3 +2401,48 @@ void sleep_for(unsigned int sec, long nsec, bool wake_after_interrupt)
                }
        } while (!wake_after_interrupt && errno == EINTR);
 }
+
+/* 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;
+}