[glibc/azanella/bz23960-dirent] linux: Add __old_readdir64_unlocked

[Adhemerval Zanella <azanella@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=8c0d87c3c1e3f3418f7a9c3279b1e8fc8e9e2661

commit 8c0d87c3c1e3f3418f7a9c3279b1e8fc8e9e2661
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Tue Apr 14 11:14:22 2020 -0300

    linux: Add __old_readdir64_unlocked
    
    And use it __old_readdir64_r.
    
    Checked on i686-linux-gnu.

Diff:
---
 sysdeps/unix/sysv/linux/olddirent.h   |  2 +
 sysdeps/unix/sysv/linux/readdir64.c   | 24 +++++++----
 sysdeps/unix/sysv/linux/readdir64_r.c | 79 ++++++++---------------------------
 3 files changed, 35 insertions(+), 70 deletions(-)

diff --git a/sysdeps/unix/sysv/linux/olddirent.h b/sysdeps/unix/sysv/linux/olddirent.h
index 9789ffae07..cde95e192e 100644
--- a/sysdeps/unix/sysv/linux/olddirent.h
+++ b/sysdeps/unix/sysv/linux/olddirent.h
@@ -32,6 +32,8 @@ struct __old_dirent64
 /* Now define the internal interfaces.  */
 extern struct __old_dirent64 *__old_readdir64 (DIR *__dirp);
 libc_hidden_proto (__old_readdir64);
+extern struct __old_dirent64 *__old_readdir64_unlocked (DIR *__dirp)
+        attribute_hidden;
 extern int __old_readdir64_r (DIR *__dirp, struct __old_dirent64 *__entry,
 			  struct __old_dirent64 **__result);
 extern __ssize_t __old_getdents64 (int __fd, char *__buf, size_t __nbytes)
diff --git a/sysdeps/unix/sysv/linux/readdir64.c b/sysdeps/unix/sysv/linux/readdir64.c
index 2327511736..b901071aa7 100644
--- a/sysdeps/unix/sysv/linux/readdir64.c
+++ b/sysdeps/unix/sysv/linux/readdir64.c
@@ -104,15 +104,11 @@ versioned_symbol (libc, __readdir64, readdir64, GLIBC_2_2);
 
 attribute_compat_text_section
 struct __old_dirent64 *
-__old_readdir64 (DIR *dirp)
+__old_readdir64_unlocked (DIR *dirp)
 {
   struct __old_dirent64 *dp;
   int saved_errno = errno;
 
-#if IS_IN (libc)
-  __libc_lock_lock (dirp->lock);
-#endif
-
   if (dirp->offset >= dirp->size)
     {
       /* We've emptied out our buffer.  Refill it.  */
@@ -129,9 +125,6 @@ __old_readdir64 (DIR *dirp)
 	     do not set errno in that case, to indicate success.  */
 	  if (bytes == 0 || errno == ENOENT)
 	    __set_errno (saved_errno);
-#if IS_IN (libc)
-	  __libc_lock_unlock (dirp->lock);
-#endif
 	  return NULL;
 	}
       dirp->size = (size_t) bytes;
@@ -144,6 +137,21 @@ __old_readdir64 (DIR *dirp)
   dirp->offset += dp->d_reclen;
   dirp->filepos = dp->d_off;
 
+  return dp;
+}
+
+attribute_compat_text_section
+struct __old_dirent64 *
+__old_readdir64 (DIR *dirp)
+{
+  struct __old_dirent64 *dp;
+
+#if IS_IN (libc)
+  __libc_lock_lock (dirp->lock);
+#endif
+
+  dp = __old_readdir64_unlocked (dirp);
+
 #if IS_IN (libc)
   __libc_lock_unlock (dirp->lock);
 #endif
diff --git a/sysdeps/unix/sysv/linux/readdir64_r.c b/sysdeps/unix/sysv/linux/readdir64_r.c
index 5ae099bde7..b499388de7 100644
--- a/sysdeps/unix/sysv/linux/readdir64_r.c
+++ b/sysdeps/unix/sysv/linux/readdir64_r.c
@@ -91,89 +91,44 @@ __old_readdir64_r (DIR *dirp, struct __old_dirent64 *entry,
 {
   struct __old_dirent64 *dp;
   size_t reclen;
-  const int saved_errno = errno;
-  int ret;
 
   __libc_lock_lock (dirp->lock);
 
-  do
+  while (1)
     {
-      if (dirp->offset >= dirp->size)
-	{
-	  /* We've emptied out our buffer.  Refill it.  */
-
-	  size_t maxread = dirp->allocation;
-	  ssize_t bytes;
-
-	  maxread = dirp->allocation;
-
-	  bytes = __old_getdents64 (dirp->fd, dirp->data, maxread);
-	  if (bytes <= 0)
-	    {
-	      /* On some systems getdents fails with ENOENT when the
-		 open directory has been rmdir'd already.  POSIX.1
-		 requires that we treat this condition like normal EOF.  */
-	      if (bytes < 0 && errno == ENOENT)
-		{
-		  bytes = 0;
-		  __set_errno (saved_errno);
-		}
-	      if (bytes < 0)
-		dirp->errcode = errno;
-
-	      dp = NULL;
-	      break;
-	    }
-	  dirp->size = (size_t) bytes;
-
-	  /* Reset the offset into the buffer.  */
-	  dirp->offset = 0;
-	}
-
-      dp = (struct __old_dirent64 *) &dirp->data[dirp->offset];
+      dp = __old_readdir64_unlocked (dirp);
+      if (dp == NULL)
+	break;
 
       reclen = dp->d_reclen;
+      if (reclen <= offsetof (struct __old_dirent64, d_name) + NAME_MAX + 1)
+	break;
 
-      dirp->offset += reclen;
-
-      dirp->filepos = dp->d_off;
-
-      if (reclen > offsetof (struct __old_dirent64, d_name) + NAME_MAX + 1)
+      /* The record is very long.  It could still fit into the caller-supplied
+	 buffer if we can skip padding at the end.  */
+      size_t namelen = _D_EXACT_NAMLEN (dp);
+      if (namelen <= NAME_MAX)
 	{
-	  /* The record is very long.  It could still fit into the
-	     caller-supplied buffer if we can skip padding at the
-	     end.  */
-	  size_t namelen = _D_EXACT_NAMLEN (dp);
-	  if (namelen <= NAME_MAX)
-	    reclen = offsetof (struct __old_dirent64, d_name) + namelen + 1;
-	  else
-	    {
-	      /* The name is too long.  Ignore this file.  */
-	      dirp->errcode = ENAMETOOLONG;
-	      dp->d_ino = 0;
-	      continue;
-	    }
+	  reclen = offsetof (struct dirent64, d_name) + namelen + 1;
+	  break;
 	}
 
-      /* Skip deleted and ignored files.  */
+      /* The name is too long.  Ignore this file.  */
+      dirp->errcode = ENAMETOOLONG;
+      dp->d_ino = 0;
     }
-  while (dp->d_ino == 0);
 
   if (dp != NULL)
     {
       *result = memcpy (entry, dp, reclen);
       entry->d_reclen = reclen;
-      ret = 0;
     }
   else
-    {
-      *result = NULL;
-      ret = dirp->errcode;
-    }
+    *result = NULL;
 
   __libc_lock_unlock (dirp->lock);
 
-  return ret;
+  return dp != NULL ? 0 : dirp->errcode;
 }
 
 compat_symbol (libc, __old_readdir64_r, readdir64_r, GLIBC_2_1);