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+/* fsusage.c -- return space usage of mounted file systems
+
+ Copyright (C) 1991, 1992, 1996, 1998, 1999, 2002, 2003, 2004, 2005, 2006
+ 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.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+
+#include <config.h>
+
+#include "fsusage.h"
+
+#include <limits.h>
+#include <sys/types.h>
+
+#if STAT_STATVFS /* 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
+
+/* 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))
+
+/* 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 */
+
+ struct statvfs fsd;
+
+ if (statvfs (file, &fsd) < 0)
+ return -1;
+
+ /* 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));
+
+#elif defined STAT_STATFS2_FS_DATA /* Ultrix */
+
+ struct fs_data fsd;
+
+ if (statfs (file, &fsd) != 1)
+ return -1;
+
+ 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, (off_t) SUPERBOFF, 0);
+ if (full_read (fd, (char *) &fsd, sizeof fsd) != sizeof fsd)
+ {
+ close (fd);
+ return -1;
+ }
+ close (fd);
+
+ 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
+
+ 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_BSIZE /* 4.3BSD, SunOS 4, HP-UX, AIX */
+
+ struct statfs fsd;
+
+ if (statfs (file, &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
+ 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 */
+
+ struct statfs fsd;
+
+ if (statfs (file, &fsd) < 0)
+ return -1;
+
+ fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_fsize);
+
+#elif defined STAT_STATFS4 /* SVR3, Dynix, Irix, AIX */
+
+# 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. */
+# if _AIX || defined _CRAY
+ fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize);
+# else
+ fsp->fsu_blocksize = 512;
+# endif
+
+#endif
+
+#if (defined STAT_STATVFS \
+ || (!defined STAT_STATFS2_FS_DATA && !defined STAT_READ_FILSYS))
+
+ 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
+
+ return 0;
+}
+
+#if defined _AIX && defined _I386
+/* AIX PS/2 does not supply statfs. */
+
+int
+statfs (char *file, struct statfs *fsb)
+{
+ struct stat stats;
+ struct dustat fsd;
+
+ if (stat (file, &stats) != 0)
+ return -1;
+ if (dustat (stats.st_dev, 0, &fsd, sizeof (fsd)))
+ return -1;
+ fsb->f_type = 0;
+ fsb->f_bsize = fsd.du_bsize;
+ fsb->f_blocks = fsd.du_fsize - fsd.du_isize;
+ fsb->f_bfree = fsd.du_tfree;
+ fsb->f_bavail = fsd.du_tfree;
+ fsb->f_files = (fsd.du_isize - 2) * fsd.du_inopb;
+ fsb->f_ffree = fsd.du_tinode;
+ fsb->f_fsid.val[0] = fsd.du_site;
+ fsb->f_fsid.val[1] = fsd.du_pckno;
+ return 0;
+}
+
+#endif /* _AIX && _I386 */
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