X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Ffsusage.c;h=a0c39d2b53c0ef9b9d5aa270211f04423b81bdcf;hb=260e67ceada4f5a198c34a018e8eff4bf15b8a4a;hp=e8c1bfca1d105246efee3cbe58366c3d66da7988;hpb=d01d0a853c3a044cdbd9f60db57ce6ebe9c43228;p=gnulib.git

diff --git a/lib/fsusage.c b/lib/fsusage.c
index e8c1bfca1..a0c39d2b5 100644
--- a/lib/fsusage.c
+++ b/lib/fsusage.c
@@ -1,10 +1,12 @@
-/* fsusage.c -- return space usage of mounted filesystems
-   Copyright (C) 1991, 1992 Free Software Foundation, Inc.
+/* fsusage.c -- return space usage of mounted file systems
 
-   This program is free software; you can redistribute it and/or modify
+   Copyright (C) 1991-1992, 1996, 1998-1999, 2002-2006, 2009-2011 Free Software
+   Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -12,197 +14,253 @@
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
-#ifdef HAVE_CONFIG_H
 #include <config.h>
-#endif
 
-#include <sys/types.h>
-#include <sys/stat.h>
 #include "fsusage.h"
-#include "safe-stat.h"
 
-int statfs ();
-
-#ifdef HAVE_SYS_PARAM_H
-#include <sys/param.h>
-#endif
+#include <limits.h>
+#include <sys/types.h>
 
-#ifdef HAVE_SYS_MOUNT_H
-#include <sys/mount.h>
+#if STAT_STATVFS || STAT_STATVFS64 /* POSIX 1003.1-2001 (and later) with XSI */
+# include <sys/statvfs.h>
+#else
+/* Don't include backward-compatibility files unless they're needed.
+   Eventually we'd like to remove all this cruft.  */
+# 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_FS_S5PARAM_H      /* Fujitsu UXP/V */
+#  include <sys/fs/s5param.h>
+# endif
+# if defined HAVE_SYS_FILSYS_H && !defined _CRAY
+#  include <sys/filsys.h>       /* SVR2 */
+# endif
+# if HAVE_SYS_STATFS_H
+#  include <sys/statfs.h>
+# endif
+# if HAVE_DUSTAT_H              /* AIX PS/2 */
+#  include <sys/dustat.h>
+# endif
+# include "full-read.h"
 #endif
 
-#ifdef HAVE_SYS_VFS_H
-#include <sys/vfs.h>
-#endif
+/* The results of open() in this file are not used with fchdir,
+   therefore save some unnecessary work in fchdir.c.  */
+#undef open
+#undef close
+
+/* Many space usage primitives use all 1 bits to denote a value that is
+   not applicable or unknown.  Propagate this information by returning
+   a uintmax_t value that is all 1 bits if X is all 1 bits, even if X
+   is unsigned and narrower than uintmax_t.  */
+#define PROPAGATE_ALL_ONES(x) \
+  ((sizeof (x) < sizeof (uintmax_t) \
+    && (~ (x) == (sizeof (x) < sizeof (int) \
+                  ? - (1 << (sizeof (x) * CHAR_BIT)) \
+                  : 0))) \
+   ? UINTMAX_MAX : (uintmax_t) (x))
+
+/* Extract the top bit of X as an uintmax_t value.  */
+#define EXTRACT_TOP_BIT(x) ((x) \
+                            & ((uintmax_t) 1 << (sizeof (x) * CHAR_BIT - 1)))
+
+/* If a value is negative, many space usage primitives store it into an
+   integer variable by assignment, even if the variable's type is unsigned.
+   So, if a space usage variable X's top bit is set, convert X to the
+   uintmax_t value V such that (- (uintmax_t) V) is the negative of
+   the original value.  If X's top bit is clear, just yield X.
+   Use PROPAGATE_TOP_BIT if the original value might be negative;
+   otherwise, use PROPAGATE_ALL_ONES.  */
+#define PROPAGATE_TOP_BIT(x) ((x) | ~ (EXTRACT_TOP_BIT (x) - 1))
 
-#ifdef HAVE_SYS_FILSYS_H
-#include <sys/filsys.h>		/* SVR2.  */
-#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
+   methods that need to know it.
+   Return 0 if successful, -1 if not.  When returning -1, ensure that
+   ERRNO is either a system error value, or zero if DISK is NULL
+   on a system that requires a non-NULL value.  */
+int
+get_fs_usage (char const *file, char const *disk, struct fs_usage *fsp)
+{
+#if defined STAT_STATVFS                /* POSIX, except glibc/Linux */
 
-#ifdef HAVE_FCNTL_H
-#include <fcntl.h>
-#endif
+  struct statvfs fsd;
 
-#ifdef HAVE_SYS_STATFS_H
-#include <sys/statfs.h>
-#endif
+  if (statvfs (file, &fsd) < 0)
+    return -1;
 
-#ifdef HAVE_DUSTAT_H		/* AIX PS/2.  */
-#include <sys/dustat.h>
-#endif
+  /* 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));
 
-#ifdef HAVE_SYS_STATVFS_H	/* SVR4.  */
-#include <sys/statvfs.h>
-int statvfs ();
-#endif
+#elif defined STAT_STATVFS64            /* AIX */
 
-/* Return the number of TOSIZE-byte blocks used by
-   BLOCKS FROMSIZE-byte blocks, rounding away from zero.
-   TOSIZE must be positive.  Return -1 if FROMSIZE is not positive.  */
+  struct statvfs64 fsd;
 
-static long
-adjust_blocks (blocks, fromsize, tosize)
-     long blocks;
-     int fromsize, tosize;
-{
-  if (tosize <= 0)
-    abort ();
-  if (fromsize <= 0)
+  if (statvfs64 (file, &fsd) < 0)
     return -1;
-								    
-  if (fromsize == tosize)	/* E.g., from 512 to 512.  */
-    return blocks;
-  else if (fromsize > tosize)	/* E.g., from 2048 to 512.  */
-    return blocks * (fromsize / tosize);
-  else				/* E.g., from 256 to 512.  */
-    return (blocks + (blocks < 0 ? -1 : 1)) / (tosize / fromsize);
-}
 
-/* Fill in the fields of FSP with information about space usage for
-   the filesystem on which PATH resides.
-   DISK is the device on which PATH is mounted, for space-getting
-   methods that need to know it.
-   Return 0 if successful, -1 if not. */
-
-int
-get_fs_usage (path, disk, fsp)
-     char *path, *disk;
-     struct fs_usage *fsp;
-{
-#if defined (STAT_STATFS3_OSF1)
-  struct statfs fsd;
+  /* 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));
 
-  if (statfs (path, &fsd, sizeof (struct statfs)) != 0)
-    return -1;
-#define CONVERT_BLOCKS(b) adjust_blocks ((b), fsd.f_fsize, 512)
-#endif /* STAT_STATFS3_OSF1 */
+#elif defined STAT_STATFS2_FS_DATA      /* Ultrix */
 
-#ifdef STAT_STATFS2_FS_DATA	/* Ultrix.  */
   struct fs_data fsd;
 
-  if (statfs (path, &fsd) != 1)
+  if (statfs (file, &fsd) != 1)
     return -1;
-#define CONVERT_BLOCKS(b) adjust_blocks ((b), 1024, 512)
-  fsp->fsu_blocks = CONVERT_BLOCKS (fsd.fd_req.btot);
-  fsp->fsu_bfree = CONVERT_BLOCKS (fsd.fd_req.bfree);
-  fsp->fsu_bavail = CONVERT_BLOCKS (fsd.fd_req.bfreen);
-  fsp->fsu_files = fsd.fd_req.gtot;
-  fsp->fsu_ffree = fsd.fd_req.gfree;
-#endif
 
-#ifdef STAT_READ_FILSYS		/* SVR2.  */
-#ifndef SUPERBOFF
-#define SUPERBOFF (SUPERB * 512)
-#endif
+  fsp->fsu_blocksize = 1024;
+  fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.fd_req.btot);
+  fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.fd_req.bfree);
+  fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.fd_req.bfreen);
+  fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.fd_req.bfreen) != 0;
+  fsp->fsu_files = PROPAGATE_ALL_ONES (fsd.fd_req.gtot);
+  fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.fd_req.gfree);
+
+#elif defined STAT_READ_FILSYS          /* SVR2 */
+# ifndef SUPERBOFF
+#  define SUPERBOFF (SUPERB * 512)
+# endif
+
   struct filsys fsd;
   int fd;
 
+  if (! disk)
+    {
+      errno = 0;
+      return -1;
+    }
+
   fd = open (disk, O_RDONLY);
   if (fd < 0)
     return -1;
-  lseek (fd, (long) SUPERBOFF, 0);
-  if (read (fd, (char *) &fsd, sizeof fsd) != sizeof fsd)
+  lseek (fd, (off_t) SUPERBOFF, 0);
+  if (full_read (fd, (char *) &fsd, sizeof fsd) != sizeof fsd)
     {
       close (fd);
       return -1;
     }
   close (fd);
-#define CONVERT_BLOCKS(b) adjust_blocks ((b), (fsd.s_type == Fs2b ? 1024 : 512), 512)
-  fsp->fsu_blocks = CONVERT_BLOCKS (fsd.s_fsize);
-  fsp->fsu_bfree = CONVERT_BLOCKS (fsd.s_tfree);
-  fsp->fsu_bavail = CONVERT_BLOCKS (fsd.s_tfree);
-  fsp->fsu_files = (fsd.s_isize - 2) * INOPB * (fsd.s_type == Fs2b ? 2 : 1);
-  fsp->fsu_ffree = fsd.s_tinode;
-#endif
 
-#ifdef STAT_STATFS2_BSIZE	/* 4.3BSD, SunOS 4, HP-UX, AIX.  */
+  fsp->fsu_blocksize = (fsd.s_type == Fs2b ? 1024 : 512);
+  fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.s_fsize);
+  fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.s_tfree);
+  fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.s_tfree);
+  fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.s_tfree) != 0;
+  fsp->fsu_files = (fsd.s_isize == -1
+                    ? UINTMAX_MAX
+                    : (fsd.s_isize - 2) * INOPB * (fsd.s_type == Fs2b ? 2 : 1));
+  fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.s_tinode);
+
+#elif defined STAT_STATFS3_OSF1         /* OSF/1 */
+
   struct statfs fsd;
 
-  if (statfs (path, &fsd) < 0)
+  if (statfs (file, &fsd, sizeof (struct statfs)) != 0)
     return -1;
-#define CONVERT_BLOCKS(b) adjust_blocks ((b), fsd.f_bsize, 512)
-#endif
 
-#ifdef STAT_STATFS2_FSIZE	/* 4.4BSD.  */
+  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, \
+                                           NetBSD < 3.0, OpenBSD < 4.4 */
+
   struct statfs fsd;
 
-  if (statfs (path, &fsd) < 0)
+  if (statfs (file, &fsd) < 0)
     return -1;
-#define CONVERT_BLOCKS(b) adjust_blocks ((b), fsd.f_fsize, 512)
-#endif
 
-#ifdef STAT_STATFS4		/* SVR3, Dynix, Irix.  */
+  fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
+
+# ifdef STATFS_TRUNCATES_BLOCK_COUNTS
+
+  /* In SunOS 4.1.2, 4.1.3, and 4.1.3_U1, the block counts in the
+     struct statfs are truncated to 2GB.  These conditions detect that
+     truncation, presumably without botching the 4.1.1 case, in which
+     the values are not truncated.  The correct counts are stored in
+     undocumented spare fields.  */
+  if (fsd.f_blocks == 0x7fffffff / fsd.f_bsize && fsd.f_spare[0] > 0)
+    {
+      fsd.f_blocks = fsd.f_spare[0];
+      fsd.f_bfree = fsd.f_spare[1];
+      fsd.f_bavail = fsd.f_spare[2];
+    }
+# endif /* STATFS_TRUNCATES_BLOCK_COUNTS */
+
+#elif defined STAT_STATFS2_FSIZE        /* 4.4BSD and older NetBSD */
+
   struct statfs fsd;
 
-  if (statfs (path, &fsd, sizeof fsd, 0) < 0)
+  if (statfs (file, &fsd) < 0)
     return -1;
+
+  fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
+
+#elif defined STAT_STATFS4              /* SVR3, Dynix, old Irix, old AIX, \
+                                           Dolphin */
+
+# if !_AIX && !defined _SEQUENT_ && !defined DOLPHIN
+#  define f_bavail f_bfree
+# endif
+
+  struct statfs fsd;
+
+  if (statfs (file, &fsd, sizeof fsd, 0) < 0)
+    return -1;
+
   /* Empirically, the block counts on most SVR3 and SVR3-derived
      systems seem to always be in terms of 512-byte blocks,
      no matter what value f_bsize has.  */
-#define CONVERT_BLOCKS(b) (b)
-#ifndef _SEQUENT_		/* _SEQUENT_ is DYNIX/ptx.  */
-#ifndef DOLPHIN			/* DOLPHIN 3.8.alfa/7.18 has f_bavail */
-#define f_bavail f_bfree
-#endif
-#endif
+# if _AIX || defined _CRAY
+   fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
+# else
+   fsp->fsu_blocksize = 512;
+# endif
+
 #endif
 
-#ifdef STAT_STATVFS		/* SVR4.  */
-  struct statvfs fsd;
+#if (defined STAT_STATVFS || defined STAT_STATVFS64 \
+     || (!defined STAT_STATFS2_FS_DATA && !defined STAT_READ_FILSYS))
 
-  if (statvfs (path, &fsd) < 0)
-    return -1;
-  /* f_frsize isn't guaranteed to be supported.  */
-#define CONVERT_BLOCKS(b) \
-  adjust_blocks ((b), fsd.f_frsize ? fsd.f_frsize : fsd.f_bsize, 512)
-#endif
+  fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.f_blocks);
+  fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.f_bfree);
+  fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.f_bavail);
+  fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.f_bavail) != 0;
+  fsp->fsu_files = PROPAGATE_ALL_ONES (fsd.f_files);
+  fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.f_ffree);
 
-#if !defined(STAT_STATFS2_FS_DATA) && !defined(STAT_READ_FILSYS) /* !Ultrix && !SVR2.  */
-  fsp->fsu_blocks = CONVERT_BLOCKS (fsd.f_blocks);
-  fsp->fsu_bfree = CONVERT_BLOCKS (fsd.f_bfree);
-  fsp->fsu_bavail = CONVERT_BLOCKS (fsd.f_bavail);
-  fsp->fsu_files = fsd.f_files;
-  fsp->fsu_ffree = fsd.f_ffree;
 #endif
 
+  (void) disk;  /* avoid argument-unused warning */
   return 0;
 }
 
-#if defined(_AIX) && defined(_I386)
+#if defined _AIX && defined _I386
 /* AIX PS/2 does not supply statfs.  */
 
 int
-statfs (path, fsb)
-     char *path;
-     struct statfs *fsb;
+statfs (char *file, struct statfs *fsb)
 {
   struct stat stats;
   struct dustat fsd;
 
-  if (SAFE_STAT (path, &stats))
+  if (stat (file, &stats) != 0)
     return -1;
   if (dustat (stats.st_dev, 0, &fsd, sizeof (fsd)))
     return -1;
@@ -217,4 +275,5 @@ statfs (path, fsb)
   fsb->f_fsid.val[1] = fsd.du_pckno;
   return 0;
 }
+
 #endif /* _AIX && _I386 */