X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Ffsusage.c;h=0657555f44d17805e7c90d8e4d6d5ae41296522a;hb=5191b3546cfb6c163228c23f214e325ddf60d46f;hp=099b0aabcbba5fedbaf8a57e99739026673a9b9f;hpb=1602f0afed21be664fcf5c42d59db07cc22c56d6;p=gnulib.git

diff --git a/lib/fsusage.c b/lib/fsusage.c
index 099b0aabc..0657555f4 100644
--- a/lib/fsusage.c
+++ b/lib/fsusage.c
@@ -1,6 +1,6 @@
 /* fsusage.c -- return space usage of mounted file systems
 
-   Copyright (C) 1991-1992, 1996, 1998-1999, 2002-2006, 2009-2012 Free Software
+   Copyright (C) 1991-1992, 1996, 1998-1999, 2002-2006, 2009-2013 Free Software
    Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
@@ -31,15 +31,15 @@
 # include <fcntl.h>
 # include <unistd.h>
 # include <sys/stat.h>
-# if HAVE_SYS_PARAM_H
-#  include <sys/param.h>
-# endif
-# if HAVE_SYS_MOUNT_H
-#  include <sys/mount.h>
-# endif
-# if HAVE_SYS_VFS_H
-#  include <sys/vfs.h>
-# endif
+#if HAVE_SYS_PARAM_H
+# include <sys/param.h>
+#endif
+#if HAVE_SYS_MOUNT_H
+# include <sys/mount.h>
+#endif
+#if HAVE_SYS_VFS_H
+# include <sys/vfs.h>
+#endif
 # if HAVE_SYS_FS_S5PARAM_H      /* Fujitsu UXP/V */
 #  include <sys/fs/s5param.h>
 # endif
@@ -84,6 +84,35 @@
    otherwise, use PROPAGATE_ALL_ONES.  */
 #define PROPAGATE_TOP_BIT(x) ((x) | ~ (EXTRACT_TOP_BIT (x) - 1))
 
+#ifdef STAT_STATVFS
+/* Return true if statvfs works.  This is false for statvfs on systems
+   with GNU libc on Linux kernels before 2.6.36, which stats all
+   preceding entries in /proc/mounts; that makes df hang if even one
+   of the corresponding file systems is hard-mounted but not available.  */
+# if ! (__linux__ && (__GLIBC__ || __UCLIBC__))
+/* The FRSIZE fallback is not required in this case.  */
+#  undef STAT_STATFS2_FRSIZE
+static int statvfs_works (void) { return 1; }
+# else
+#  include <string.h> /* for strverscmp */
+#  include <sys/utsname.h>
+#  include <sys/statfs.h>
+#  define STAT_STATFS2_BSIZE 1
+
+static int
+statvfs_works (void)
+{
+  static int statvfs_works_cache = -1;
+  struct utsname name;
+  if (statvfs_works_cache < 0)
+    statvfs_works_cache = (uname (&name) == 0
+                           && 0 <= strverscmp (name.release, "2.6.36"));
+  return statvfs_works_cache;
+}
+# endif
+#endif
+
+
 /* Fill in the fields of FSP with information about space usage for
    the file system on which FILE resides.
    DISK is the device on which FILE is mounted, for space-getting
@@ -94,19 +123,32 @@
 int
 get_fs_usage (char const *file, char const *disk, struct fs_usage *fsp)
 {
-#if defined STAT_STATVFS                /* POSIX, except glibc/Linux */
-
-  struct statvfs fsd;
+#ifdef STAT_STATVFS     /* POSIX, except pre-2.6.36 glibc/Linux */
 
-  if (statvfs (file, &fsd) < 0)
-    return -1;
+  if (statvfs_works ())
+    {
+      struct statvfs vfsd;
+
+      if (statvfs (file, &vfsd) < 0)
+        return -1;
+
+      /* f_frsize isn't guaranteed to be supported.  */
+      fsp->fsu_blocksize = (vfsd.f_frsize
+                            ? PROPAGATE_ALL_ONES (vfsd.f_frsize)
+                            : PROPAGATE_ALL_ONES (vfsd.f_bsize));
+
+      fsp->fsu_blocks = PROPAGATE_ALL_ONES (vfsd.f_blocks);
+      fsp->fsu_bfree = PROPAGATE_ALL_ONES (vfsd.f_bfree);
+      fsp->fsu_bavail = PROPAGATE_TOP_BIT (vfsd.f_bavail);
+      fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (vfsd.f_bavail) != 0;
+      fsp->fsu_files = PROPAGATE_ALL_ONES (vfsd.f_files);
+      fsp->fsu_ffree = PROPAGATE_ALL_ONES (vfsd.f_ffree);
+      return 0;
+    }
 
-  /* f_frsize isn't guaranteed to be supported.  */
-  fsp->fsu_blocksize = (fsd.f_frsize
-                        ? PROPAGATE_ALL_ONES (fsd.f_frsize)
-                        : PROPAGATE_ALL_ONES (fsd.f_bsize));
+#endif
 
-#elif defined STAT_STATVFS64            /* AIX */
+#if defined STAT_STATVFS64            /* AIX */
 
   struct statvfs64 fsd;
 
@@ -177,8 +219,17 @@ get_fs_usage (char const *file, char const *disk, struct fs_usage *fsp)
 
   fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
 
-#elif defined STAT_STATFS2_BSIZE        /* glibc/Linux, 4.3BSD, SunOS 4, \
-                                           MacOS X < 10.4, FreeBSD < 5.0, \
+#elif defined STAT_STATFS2_FRSIZE        /* 2.6 < glibc/Linux < 2.6.36 */
+
+  struct statfs fsd;
+
+  if (statfs (file, &fsd) < 0)
+    return -1;
+
+  fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_frsize);
+
+#elif defined STAT_STATFS2_BSIZE        /* glibc/Linux < 2.6, 4.3BSD, SunOS 4, \
+                                           Mac OS X < 10.4, FreeBSD < 5.0, \
                                            NetBSD < 3.0, OpenBSD < 4.4 */
 
   struct statfs fsd;
@@ -235,8 +286,9 @@ get_fs_usage (char const *file, char const *disk, struct fs_usage *fsp)
 
 #endif
 
-#if (defined STAT_STATVFS || defined STAT_STATVFS64 \
-     || (!defined STAT_STATFS2_FS_DATA && !defined STAT_READ_FILSYS))
+#if (defined STAT_STATVFS64 || defined STAT_STATFS3_OSF1                \
+     || defined STAT_STATFS2_FRSIZE || defined STAT_STATFS2_BSIZE       \
+     || defined STAT_STATFS2_FSIZE || defined STAT_STATFS4)
 
   fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.f_blocks);
   fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.f_bfree);