/* 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 #include "fsusage.h" #include #include #if STAT_STATVFS /* POSIX 1003.1-2001 (and later) with XSI */ # include #else /* Don't include backward-compatibility files unless they're needed. Eventually we'd like to remove all this cruft. */ # include # include # include # if HAVE_SYS_PARAM_H # include # endif # if HAVE_SYS_MOUNT_H # include # endif # if HAVE_SYS_VFS_H # include # endif # if HAVE_SYS_FS_S5PARAM_H /* Fujitsu UXP/V */ # include # endif # if defined HAVE_SYS_FILSYS_H && !defined _CRAY # include /* SVR2 */ # endif # if HAVE_SYS_STATFS_H # include # endif # if HAVE_DUSTAT_H /* AIX PS/2 */ # include # 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 */