libc: FTS support for dynamic inode numbering

Edited by Lionel Sambuc and David van Moolenbroek.

Change-Id: I29d6383499d8c0524f86f9dcec701aff35ce8a43

diff --git a/lib/libc/gen/fts.c b/lib/libc/gen/fts.c
index d1236fd5fc99945e0a65918b8952c2e31caa244d..c5141f1a7fa8662d201c1dc4dda67d1b27adb077 100644 (file)
--- a/lib/libc/gen/fts.c
+++ b/lib/libc/gen/fts.c
@@ -1197,6 +1197,10 @@ fts_maxarglen(char * const *argv)
        return (max + 1);
 }
 
+#ifdef __minix
+#include <minix/dmap.h>
+#endif
+
 /*
  * Change to dir specified by fd or p->fts_accpath without getting
  * tricked by someone changing the world out from underneath us.
@@ -1217,7 +1221,22 @@ fts_safe_changedir(const FTS *sp, const FTSENT *p, int fd, const char *path)
        if (fstat(fd, &sb) == -1)
                goto bail;
 
+#ifdef __minix
+       /*
+        * Skip the safety check on file systems where inodes are not static.
+        * On such file systems, a file may legitimately be assigned a new
+        * inode number due to being deleted and regenerated while we are
+        * running.  This behavior is not POSIX compliant, but necessary for
+        * certain types of file systems.  Currently, we assume that this
+        * applies to all (and only) file systems that are not device backed.
+        * In the future, we may have to obtain an appropriate flag through
+        * statvfs(3) instead.
+        */
+       if ((sb.st_ino != p->fts_ino || sb.st_dev != p->fts_dev)
+               && major(sb.st_dev) != NONE_MAJOR) {
+#else
        if (sb.st_ino != p->fts_ino || sb.st_dev != p->fts_dev) {
+#endif
                errno = ENOENT;
                goto bail;
        }