/* fsusage.c -- return space usage of mounted filesystems
- Copyright (C) 1991, 1992 Free Software Foundation, Inc.
+ Copyright (C) 1991, 1992, 1996, 1998, 1999 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
# include <config.h>
#endif
+#if HAVE_INTTYPES_H
+# include <inttypes.h>
+#endif
#include <sys/types.h>
#include <sys/stat.h>
#include "fsusage.h"
+#if HAVE_LIMITS_H
+# include <limits.h>
+#endif
+#ifndef CHAR_BIT
+# define CHAR_BIT 8
+#endif
+
int statfs ();
#if HAVE_SYS_PARAM_H
int statvfs ();
#endif
-int safe_read ();
-
-/* 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. */
+/* 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 the argument is all 1 bits,
+ even if the argument is unsigned and smaller than uintmax_t. */
+#define PROPAGATE_ALL_ONES(x) ((x) == -1 ? (uintmax_t) -1 : (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))
-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);
-}
+int safe_read ();
/* 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)
- const char *path;
- const char *disk;
- struct fs_usage *fsp;
+get_fs_usage (const char *path, const char *disk, struct fs_usage *fsp)
{
#ifdef STAT_STATFS3_OSF1
-# define CONVERT_BLOCKS(B) adjust_blocks ((B), fsd.f_fsize, 512)
struct statfs fsd;
if (statfs (path, &fsd, sizeof (struct statfs)) != 0)
return -1;
+ fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
+
#endif /* STAT_STATFS3_OSF1 */
#ifdef STAT_STATFS2_FS_DATA /* Ultrix */
-# define CONVERT_BLOCKS(B) adjust_blocks ((B), 1024, 512)
struct fs_data fsd;
if (statfs (path, &fsd) != 1)
return -1;
- 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;
+
+ 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 */
# ifndef SUPERBOFF
# define SUPERBOFF (SUPERB * 512)
# endif
-# define CONVERT_BLOCKS(B) \
- adjust_blocks ((B), (fsd.s_type == Fs2b ? 1024 : 512), 512)
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);
+ lseek (fd, (off_t) SUPERBOFF, 0);
if (safe_read (fd, (char *) &fsd, sizeof fsd) != sizeof fsd)
{
close (fd);
return -1;
}
close (fd);
- 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;
+
+ 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_t) -1
+ : (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 */
-# define CONVERT_BLOCKS(B) adjust_blocks ((B), fsd.f_bsize, 512)
struct statfs fsd;
if (statfs (path, &fsd) < 0)
return -1;
+ 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
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 == 0x1fffff && fsd.f_spare[0] > 0)
+ 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];
#endif /* STAT_STATFS2_BSIZE */
#ifdef STAT_STATFS2_FSIZE /* 4.4BSD */
-# define CONVERT_BLOCKS(B) adjust_blocks ((B), fsd.f_fsize, 512)
struct statfs fsd;
if (statfs (path, &fsd) < 0)
return -1;
+ fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
+
#endif /* STAT_STATFS2_FSIZE */
#ifdef STAT_STATFS4 /* SVR3, Dynix, Irix, AIX */
-# if _AIX || defined(_CRAY)
-# define CONVERT_BLOCKS(B) adjust_blocks ((B), fsd.f_bsize, 512)
-# ifdef _CRAY
-# define f_bavail f_bfree
-# endif
-# else
-# 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 _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. */
+# 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 */
-# define CONVERT_BLOCKS(B) \
- adjust_blocks ((B), fsd.f_frsize ? fsd.f_frsize : fsd.f_bsize, 512)
struct statvfs fsd;
if (statvfs (path, &fsd) < 0)
return -1;
+
/* f_frsize isn't guaranteed to be supported. */
+ fsp->fsu_blocksize =
+ PROPAGATE_ALL_ONES (fsd.f_frsize ? fsd.f_frsize : fsd.f_bsize);
#endif /* STAT_STATVFS */
#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;
+ 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 */
/* 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;