/* fsusage.c -- return space usage of mounted filesystems
- Copyright (C) 1991, 1992 Free Software Foundation, Inc.
+
+ Copyright (C) 1991, 1992, 1996, 1998, 1999, 2002, 2003 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
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, write to the Free Software Foundation,
+ Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
-#ifdef HAVE_CONFIG_H
-#include <config.h>
+#if HAVE_INTTYPES_H
+# include <inttypes.h>
+#else
+# if HAVE_STDINT_H
+# include <stdint.h>
+# endif
+#endif
+#ifndef UINTMAX_MAX
+# define UINTMAX_MAX ((uintmax_t) -1)
#endif
#include <sys/types.h>
+#include <sys/stat.h>
#include "fsusage.h"
-#include "safe-stat.h"
-int statfs ();
+#include <limits.h>
-#if defined (STAT_STATFS3_OSF1) /* DEC Alpha running OSF/1 */
-# include <sys/mount.h>
+#if HAVE_SYS_PARAM_H
+# include <sys/param.h>
#endif
-#if defined(STAT_STATFS2_BSIZE) && !defined(_IBMR2) /* 4.3BSD, SunOS 4, HP-UX, AIX PS/2. */
-#include <sys/vfs.h>
+#if HAVE_SYS_MOUNT_H
+# include <sys/mount.h>
#endif
-#ifdef STAT_STATFS2_FSIZE /* 4.4BSD. */
-#include <sys/mount.h>
+#if HAVE_SYS_VFS_H
+# include <sys/vfs.h>
#endif
-#ifdef STAT_STATFS2_FS_DATA /* Ultrix. */
-#include <sys/param.h>
-#include <sys/mount.h>
+#if HAVE_SYS_FS_S5PARAM_H /* Fujitsu UXP/V */
+# include <sys/fs/s5param.h>
#endif
-#ifdef STAT_READ /* SVR2. */
-#include <sys/param.h>
-#include <sys/filsys.h>
-#include <fcntl.h>
+#if defined HAVE_SYS_FILSYS_H && !defined _CRAY
+# include <sys/filsys.h> /* SVR2 */
#endif
-#if defined(STAT_STATFS4) || (defined(_AIX) && defined(_IBMR2)) /* SVR3, Dynix, Irix, AIX RS6000. */
-#include <sys/statfs.h>
+#if HAVE_FCNTL_H
+# include <fcntl.h>
#endif
-#if defined(_AIX) && defined(_I386) /* AIX PS/2. */
-#include <sys/stat.h>
-#include <sys/dustat.h>
+#if HAVE_SYS_STATFS_H
+# include <sys/statfs.h>
#endif
-#ifdef STAT_STATVFS /* SVR4. */
-#include <sys/statvfs.h>
-int statvfs ();
+#if HAVE_DUSTAT_H /* AIX PS/2 */
+# include <sys/dustat.h>
#endif
-/* 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. */
+#if HAVE_SYS_STATVFS_H /* SVR4 */
+# include <sys/statvfs.h>
+int statvfs ();
+#endif
-static long
-adjust_blocks (blocks, fromsize, tosize)
- long blocks;
- int fromsize, tosize;
-{
- if (tosize <= 0)
- abort ();
- if (fromsize <= 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);
-}
+#include "full-read.h"
+
+/* 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 : (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))
/* 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. */
-
+ 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 (path, disk, fsp)
- char *path, *disk;
- struct fs_usage *fsp;
+get_fs_usage (const char *path, const char *disk, struct fs_usage *fsp)
{
-#if defined (STAT_STATFS3_OSF1)
+#ifdef STAT_STATFS3_OSF1
+
struct statfs fsd;
if (statfs (path, &fsd, sizeof (struct statfs)) != 0)
return -1;
-#define CONVERT_BLOCKS(b) adjust_blocks ((b), fsd.f_fsize, 512)
+
+ fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
+
#endif /* STAT_STATFS3_OSF1 */
-#ifdef STAT_STATFS2_FS_DATA /* Ultrix. */
+#ifdef STAT_STATFS2_FS_DATA /* Ultrix */
+
struct fs_data fsd;
if (statfs (path, &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 /* 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);
+
+#endif /* STAT_STATFS2_FS_DATA */
+
+#ifdef 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);
+
+#endif /* STAT_READ_FILSYS */
+
+#ifdef STAT_STATFS2_BSIZE /* 4.3BSD, SunOS 4, HP-UX, AIX */
+
struct statfs fsd;
if (statfs (path, &fsd) < 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_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 */
+
+#endif /* STAT_STATFS2_BSIZE */
+
+#ifdef STAT_STATFS2_FSIZE /* 4.4BSD */
+
struct statfs fsd;
if (statfs (path, &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_fsize);
+
+#endif /* STAT_STATFS2_FSIZE */
+
+#ifdef STAT_STATFS4 /* SVR3, Dynix, Irix, AIX */
+
+# if !_AIX && !defined _SEQUENT_ && !defined DOLPHIN
+# define f_bavail f_bfree
+# endif
+
struct statfs fsd;
if (statfs (path, &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
-#endif
+# if _AIX || defined _CRAY
+ fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
+# else
+ fsp->fsu_blocksize = 512;
+# endif
+
+#endif /* STAT_STATFS4 */
+
+#ifdef STAT_STATVFS /* SVR4 */
-#ifdef STAT_STATVFS /* SVR4. */
struct statvfs fsd;
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_blocksize = (fsd.f_frsize
+ ? PROPAGATE_ALL_ONES (fsd.f_frsize)
+ : PROPAGATE_ALL_ONES (fsd.f_bsize));
-#if !defined(STAT_STATFS2_FS_DATA) && !defined(STAT_READ) /* !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
+#endif /* STAT_STATVFS */
+
+#if !defined STAT_STATFS2_FS_DATA && !defined STAT_READ_FILSYS
+ /* !Ultrix && !SVR2 */
+
+ 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);
+
+#endif /* not STAT_STATFS2_FS_DATA && not STAT_READ_FILSYS */
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 *path, struct statfs *fsb)
{
struct stat stats;
struct dustat fsd;
- if (SAFE_STAT (path, &stats))
+ if (stat (path, &stats))
return -1;
if (dustat (stats.st_dev, 0, &fsd, sizeof (fsd)))
return -1;
fsb->f_fsid.val[1] = fsd.du_pckno;
return 0;
}
+
#endif /* _AIX && _I386 */
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