-/* 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, 2009-2014 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
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"
-int statfs ();
+#include <limits.h>
+#include <sys/types.h>
-#ifdef HAVE_SYS_PARAM_H
-#include <sys/param.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
-
-#ifdef HAVE_SYS_MOUNT_H
-#include <sys/mount.h>
+#if HAVE_SYS_MOUNT_H
+# include <sys/mount.h>
#endif
-
-#ifdef HAVE_SYS_VFS_H
-#include <sys/vfs.h>
+#if HAVE_SYS_VFS_H
+# include <sys/vfs.h>
#endif
-
-#if defined(HAVE_SYS_FILSYS_H) && !defined(_CRAY)
-#include <sys/filsys.h> /* SVR2. */
+# 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_FCNTL_H
-#include <fcntl.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 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
-#ifdef HAVE_SYS_STATFS_H
-#include <sys/statfs.h>
+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
-#ifdef HAVE_DUSTAT_H /* AIX PS/2. */
-#include <sys/dustat.h>
-#endif
-#ifdef HAVE_SYS_STATVFS_H /* SVR4. */
-#include <sys/statvfs.h>
-int statvfs ();
-#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)
+{
+#ifdef STAT_STATVFS /* POSIX, except pre-2.6.36 glibc/Linux */
-int safe_read ();
+ 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;
+ }
-/* 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. */
+#endif
-static long
-adjust_blocks (blocks, fromsize, tosize)
- long blocks;
- int fromsize, tosize;
-{
- if (tosize <= 0)
- abort ();
- if (fromsize <= 0)
- return -1;
+#if defined STAT_STATVFS64 /* AIX */
- 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);
-}
+ struct statvfs64 fsd;
-/* 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. */
+ if (statvfs64 (file, &fsd) < 0)
+ return -1;
-int
-get_fs_usage (path, disk, fsp)
- const char *path;
- const char *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 (safe_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 (file, &fsd, sizeof (struct statfs)) != 0)
+ return -1;
+
+ fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
+
+#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;
- if (statfs (path, &fsd) < 0)
+ if (statfs (file, &fsd) < 0)
return -1;
-#ifdef STATFS_TRUNCATES_BLOCK_COUNTS
+ 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 == 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];
fsd.f_bavail = fsd.f_spare[2];
}
-#endif /* STATFS_TRUNCATES_BLOCK_COUNTS */
+# endif /* STATFS_TRUNCATES_BLOCK_COUNTS */
-#define CONVERT_BLOCKS(b) adjust_blocks ((b), fsd.f_bsize, 512)
-#endif
+#elif defined STAT_STATFS2_FSIZE /* 4.4BSD and older NetBSD */
-#ifdef STAT_STATFS2_FSIZE /* 4.4BSD. */
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, AIX. */
+ 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 (path, &fsd, sizeof fsd, 0) < 0)
+ 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. */
-# if _AIX
-# define CONVERT_BLOCKS(b) adjust_blocks ((b), fsd.f_bsize, 512)
+# if _AIX || defined _CRAY
+ fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
# 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
+ fsp->fsu_blocksize = 512;
# endif
+
#endif
-#ifdef STAT_STATVFS /* SVR4. */
- struct statvfs fsd;
+#if (defined STAT_STATVFS64 || defined STAT_STATFS3_OSF1 \
+ || defined STAT_STATFS2_FRSIZE || defined STAT_STATFS2_BSIZE \
+ || defined STAT_STATFS2_FSIZE || defined STAT_STATFS4)
- 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 (stat (path, &stats))
+ if (stat (file, &stats) != 0)
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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