293 lines
7.8 KiB
C
293 lines
7.8 KiB
C
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/* fsusage.c -- return space usage of mounted filesystems
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Copyright (C) 1991, 1992, 1996, 1998, 1999, 2002, 2003 Free
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Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#if HAVE_INTTYPES_H
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# include <inttypes.h>
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#else
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# if HAVE_STDINT_H
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# include <stdint.h>
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# endif
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#endif
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#ifndef UINTMAX_MAX
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# define UINTMAX_MAX ((uintmax_t) -1)
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#endif
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#include <sys/types.h>
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#include <sys/stat.h>
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#include "fsusage.h"
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#include <limits.h>
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#if HAVE_SYS_PARAM_H
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# include <sys/param.h>
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#endif
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#if HAVE_SYS_MOUNT_H
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# include <sys/mount.h>
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#endif
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#if HAVE_SYS_VFS_H
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# include <sys/vfs.h>
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#endif
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#if HAVE_SYS_FS_S5PARAM_H /* Fujitsu UXP/V */
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# include <sys/fs/s5param.h>
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#endif
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#if defined HAVE_SYS_FILSYS_H && !defined _CRAY
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# include <sys/filsys.h> /* SVR2 */
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#endif
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#if HAVE_FCNTL_H
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# include <fcntl.h>
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#endif
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#if HAVE_SYS_STATFS_H
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# include <sys/statfs.h>
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#endif
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#if HAVE_DUSTAT_H /* AIX PS/2 */
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# include <sys/dustat.h>
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#endif
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#if HAVE_SYS_STATVFS_H /* SVR4 */
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# include <sys/statvfs.h>
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int statvfs ();
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#endif
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#include "full-read.h"
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/* Many space usage primitives use all 1 bits to denote a value that is
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not applicable or unknown. Propagate this information by returning
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a uintmax_t value that is all 1 bits if X is all 1 bits, even if X
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is unsigned and narrower than uintmax_t. */
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#define PROPAGATE_ALL_ONES(x) \
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((sizeof (x) < sizeof (uintmax_t) \
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&& (~ (x) == (sizeof (x) < sizeof (int) \
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? - (1 << (sizeof (x) * CHAR_BIT)) \
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: 0))) \
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? UINTMAX_MAX : (x))
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/* Extract the top bit of X as an uintmax_t value. */
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#define EXTRACT_TOP_BIT(x) ((x) \
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& ((uintmax_t) 1 << (sizeof (x) * CHAR_BIT - 1)))
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/* If a value is negative, many space usage primitives store it into an
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integer variable by assignment, even if the variable's type is unsigned.
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So, if a space usage variable X's top bit is set, convert X to the
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uintmax_t value V such that (- (uintmax_t) V) is the negative of
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the original value. If X's top bit is clear, just yield X.
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Use PROPAGATE_TOP_BIT if the original value might be negative;
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otherwise, use PROPAGATE_ALL_ONES. */
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#define PROPAGATE_TOP_BIT(x) ((x) | ~ (EXTRACT_TOP_BIT (x) - 1))
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/* Fill in the fields of FSP with information about space usage for
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the filesystem on which PATH resides.
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DISK is the device on which PATH is mounted, for space-getting
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methods that need to know it.
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Return 0 if successful, -1 if not. When returning -1, ensure that
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ERRNO is either a system error value, or zero if DISK is NULL
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on a system that requires a non-NULL value. */
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int
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get_fs_usage (const char *path, const char *disk, struct fs_usage *fsp)
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{
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#ifdef STAT_STATFS3_OSF1
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struct statfs fsd;
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if (statfs (path, &fsd, sizeof (struct statfs)) != 0)
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return -1;
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fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
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#endif /* STAT_STATFS3_OSF1 */
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#ifdef STAT_STATFS2_FS_DATA /* Ultrix */
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struct fs_data fsd;
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if (statfs (path, &fsd) != 1)
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return -1;
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fsp->fsu_blocksize = 1024;
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fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.fd_req.btot);
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fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.fd_req.bfree);
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fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.fd_req.bfreen);
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fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.fd_req.bfreen) != 0;
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fsp->fsu_files = PROPAGATE_ALL_ONES (fsd.fd_req.gtot);
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fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.fd_req.gfree);
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#endif /* STAT_STATFS2_FS_DATA */
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#ifdef STAT_READ_FILSYS /* SVR2 */
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# ifndef SUPERBOFF
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# define SUPERBOFF (SUPERB * 512)
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# endif
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struct filsys fsd;
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int fd;
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if (! disk)
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{
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errno = 0;
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return -1;
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}
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fd = open (disk, O_RDONLY);
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if (fd < 0)
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return -1;
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lseek (fd, (off_t) SUPERBOFF, 0);
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if (full_read (fd, (char *) &fsd, sizeof fsd) != sizeof fsd)
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{
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close (fd);
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return -1;
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}
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close (fd);
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fsp->fsu_blocksize = (fsd.s_type == Fs2b ? 1024 : 512);
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fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.s_fsize);
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fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.s_tfree);
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fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.s_tfree);
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fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.s_tfree) != 0;
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fsp->fsu_files = (fsd.s_isize == -1
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? UINTMAX_MAX
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: (fsd.s_isize - 2) * INOPB * (fsd.s_type == Fs2b ? 2 : 1));
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fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.s_tinode);
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#endif /* STAT_READ_FILSYS */
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#ifdef STAT_STATFS2_BSIZE /* 4.3BSD, SunOS 4, HP-UX, AIX */
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struct statfs fsd;
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if (statfs (path, &fsd) < 0)
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return -1;
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fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
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# ifdef STATFS_TRUNCATES_BLOCK_COUNTS
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/* In SunOS 4.1.2, 4.1.3, and 4.1.3_U1, the block counts in the
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struct statfs are truncated to 2GB. These conditions detect that
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truncation, presumably without botching the 4.1.1 case, in which
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the values are not truncated. The correct counts are stored in
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undocumented spare fields. */
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if (fsd.f_blocks == 0x7fffffff / fsd.f_bsize && fsd.f_spare[0] > 0)
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{
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fsd.f_blocks = fsd.f_spare[0];
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fsd.f_bfree = fsd.f_spare[1];
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fsd.f_bavail = fsd.f_spare[2];
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}
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# endif /* STATFS_TRUNCATES_BLOCK_COUNTS */
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#endif /* STAT_STATFS2_BSIZE */
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#ifdef STAT_STATFS2_FSIZE /* 4.4BSD */
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struct statfs fsd;
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if (statfs (path, &fsd) < 0)
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return -1;
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fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
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#endif /* STAT_STATFS2_FSIZE */
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#ifdef STAT_STATFS4 /* SVR3, Dynix, Irix, AIX */
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# if !_AIX && !defined _SEQUENT_ && !defined DOLPHIN
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# define f_bavail f_bfree
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# endif
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struct statfs fsd;
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if (statfs (path, &fsd, sizeof fsd, 0) < 0)
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return -1;
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/* Empirically, the block counts on most SVR3 and SVR3-derived
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systems seem to always be in terms of 512-byte blocks,
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no matter what value f_bsize has. */
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# if _AIX || defined _CRAY
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fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
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# else
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fsp->fsu_blocksize = 512;
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# endif
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#endif /* STAT_STATFS4 */
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#ifdef STAT_STATVFS /* SVR4 */
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struct statvfs fsd;
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if (statvfs (path, &fsd) < 0)
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return -1;
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/* f_frsize isn't guaranteed to be supported. */
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fsp->fsu_blocksize = (fsd.f_frsize
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? PROPAGATE_ALL_ONES (fsd.f_frsize)
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: PROPAGATE_ALL_ONES (fsd.f_bsize));
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#endif /* STAT_STATVFS */
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#if !defined STAT_STATFS2_FS_DATA && !defined STAT_READ_FILSYS
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/* !Ultrix && !SVR2 */
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fsp->fsu_blocks = PROPAGATE_ALL_ONES (fsd.f_blocks);
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fsp->fsu_bfree = PROPAGATE_ALL_ONES (fsd.f_bfree);
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fsp->fsu_bavail = PROPAGATE_TOP_BIT (fsd.f_bavail);
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fsp->fsu_bavail_top_bit_set = EXTRACT_TOP_BIT (fsd.f_bavail) != 0;
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fsp->fsu_files = PROPAGATE_ALL_ONES (fsd.f_files);
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fsp->fsu_ffree = PROPAGATE_ALL_ONES (fsd.f_ffree);
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#endif /* not STAT_STATFS2_FS_DATA && not STAT_READ_FILSYS */
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return 0;
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}
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#if defined _AIX && defined _I386
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/* AIX PS/2 does not supply statfs. */
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int
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statfs (char *path, struct statfs *fsb)
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{
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struct stat stats;
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struct dustat fsd;
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if (stat (path, &stats))
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return -1;
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if (dustat (stats.st_dev, 0, &fsd, sizeof (fsd)))
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return -1;
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fsb->f_type = 0;
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fsb->f_bsize = fsd.du_bsize;
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fsb->f_blocks = fsd.du_fsize - fsd.du_isize;
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fsb->f_bfree = fsd.du_tfree;
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fsb->f_bavail = fsd.du_tfree;
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fsb->f_files = (fsd.du_isize - 2) * fsd.du_inopb;
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fsb->f_ffree = fsd.du_tinode;
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fsb->f_fsid.val[0] = fsd.du_site;
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fsb->f_fsid.val[1] = fsd.du_pckno;
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return 0;
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}
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#endif /* _AIX && _I386 */
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