From 45e878bba6b490bf204db824be71f070689c8737 Mon Sep 17 00:00:00 2001
From: Neil Brown <neilb@suse.de>
Date: Mon, 26 Jun 2006 15:10:48 +1000
Subject: [PATCH] Improve ftw handling.

If not 'ftw' is available, still allow openning of devices by dev number.

More recent version of uclibc support nftw, so add support to check
for that.
---
 ChangeLog |  2 ++
 mdadm.h   | 26 +++++++++++++++++++++-----
 util.c    | 50 ++++++++++++++++++++++----------------------------
 3 files changed, 45 insertions(+), 33 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 75e53bbb..3ff36ce8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -10,6 +10,8 @@ Changes Prior to this release
 	information in superblocks.
     -   Don't claim newly added spares are InSync!! (don't know why that
 	code was ever in there)
+    -   Work better when no 'ftw' is available, and check to see
+	if current uclibc provides ftw.
 
 Changes Prior to 2.5.1 release
     -   Various fixes for gcc warnings
diff --git a/mdadm.h b/mdadm.h
index 9113560a..6afdf863 100644
--- a/mdadm.h
+++ b/mdadm.h
@@ -343,16 +343,32 @@ extern struct supertype *guess_super(int fd);
 struct stat64;
 #endif
 
+#define HAVE_NFTW  we assume
+#define HAVE_FTW
+
 #ifdef UCLIBC
-  struct FTW {};
+# include <features.h>
+# ifndef  __UCLIBC_HAS_FTW__
+#  undef HAVE_FTW
+#  undef HAVE_NFTW
+# endif
+#endif
+
+#ifdef __dietlibc__
+# undef HAVE_NFTW
+#endif
+
+#ifndef HAVE_NFTW
 # define FTW_PHYS 1
-#else
-# include <ftw.h>
-# ifdef __dietlibc__
-#  define FTW_PHYS 1
+# ifndef HAVE_FTW
+  struct FTW {};
 # endif
 #endif
 
+#ifdef HAVE_FTW
+# include <ftw.h>
+#endif
+
 extern int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s);
 
 
diff --git a/util.c b/util.c
index 2cb6dd31..08319cb6 100644
--- a/util.c
+++ b/util.c
@@ -354,32 +354,6 @@ struct devmap {
 } *devlist = NULL;
 int devlist_ready = 0;
 
-#ifdef UCLIBC
-int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s)
-{
-	return 0;
-}
-char *map_dev(int major, int minor, int create)
-{
-#if 0
-	fprintf(stderr, "Warning - fail to map %d,%d to a device name\n",
-		major, minor);
-#endif
-	return NULL;
-}
-#else
-
-#ifdef __dietlibc__
-int add_dev_1(const char *name, const struct stat *stb, int flag)
-{
-	return add_dev(name, stb, flag, NULL);
-}
-int nftw(const char *path, int (*han)(const char *name, const struct stat *stb, int flag, struct FTW *s), int nopenfd, int flags)
-{
-	return ftw(path, add_dev_1, nopenfd);
-}
-#endif
-
 int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s)
 {
 	struct stat st;
@@ -404,6 +378,28 @@ int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s)
 	return 0;
 }
 
+#ifndef HAVE_NFTW
+#ifdef HAVE_FTW
+int add_dev_1(const char *name, const struct stat *stb, int flag)
+{
+	return add_dev(name, stb, flag, NULL);
+}
+int nftw(const char *path, int (*han)(const char *name, const struct stat *stb, int flag, struct FTW *s), int nopenfd, int flags)
+{
+	return ftw(path, add_dev_1, nopenfd);
+}
+#else
+int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s)
+{
+	return 0;
+}
+int nftw(const char *path, int (*han)(const char *name, const struct stat *stb, int flag, struct FTW *s), int nopenfd, int flags)
+{
+	return 0;
+}
+#endif /* HAVE_FTW */
+#endif /* HAVE_NFTW */
+
 /*
  * Find a block device with the right major/minor number.
  * If we find multiple names, choose the shortest.
@@ -464,8 +460,6 @@ char *map_dev(int major, int minor, int create)
 	return nonstd ? nonstd : std;
 }
 
-#endif
-
 unsigned long calc_csum(void *super, int bytes)
 {
 	unsigned long long newcsum = 0;
-- 
2.39.2