X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Ffsusage.c;h=337bf5315d97a2fa1c35b06c6f45300270c820f9;hb=4b57b2a1cba017e176f1992304b8c2900bbdb569;hp=8cc0c6d7333d858177ed4b1ebfc9b85e72eee151;hpb=b01778752f699303762e2307867d462133ae2b1a;p=gnulib.git diff --git a/lib/fsusage.c b/lib/fsusage.c index 8cc0c6d73..337bf5315 100644 --- a/lib/fsusage.c +++ b/lib/fsusage.c @@ -1,5 +1,7 @@ -/* 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 + + 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 @@ -12,171 +14,238 @@ 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. */ - -#include -#include "fsusage.h" + along with this program; if not, write to the Free Software Foundation, + Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ -int statfs (); +#include -#if defined(STAT_STATFS2_BSIZE) && !defined(_IBMR2) /* 4.3BSD, SunOS 4, HP-UX, AIX PS/2. */ -#include -#endif - -#ifdef STAT_STATFS2_FSIZE /* 4.4BSD. */ -#include -#endif +#include "fsusage.h" -#ifdef STAT_STATFS2_FS_DATA /* Ultrix. */ -#include -#include -#endif +#include +#include -#ifdef STAT_READ /* SVR2. */ -#include -#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 -#if defined(STAT_STATFS4) || (defined(_AIX) && defined(_IBMR2)) /* SVR3, Dynix, Irix, AIX RS6000. */ -#include -#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)) -#if defined(_AIX) && defined(_I386) /* AIX PS/2. */ -#include -#include -#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) +{ +#if defined STAT_STATVFS /* POSIX */ -#ifdef STAT_STATVFS /* SVR4. */ -#include -int statvfs (); -#endif + struct statvfs fsd; -/* Return the number of TOSIZE-byte blocks used by - BLOCKS FROMSIZE-byte blocks, rounding up. */ + if (statvfs (file, &fsd) < 0) + return -1; -#define adjust_blocks(blocks, fromsize, tosize) \ - (((fromsize) == (tosize)) \ - ? (blocks) /* E.g., from 512 to 512. */ \ - : (((fromsize) > (tosize)) \ - /* E.g., from 2048 to 512. */ \ - ? (blocks) * ((fromsize) / (tosize)) \ - /* E.g., from 256 to 512. */ \ - : ((blocks) + 1) / ((tosize) / (fromsize)))) + /* 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)); -/* 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. */ +#elif defined STAT_STATFS2_FS_DATA /* Ultrix */ -int -get_fs_usage (path, disk, fsp) - char *path, *disk; - struct fs_usage *fsp; -{ -#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 /* 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 (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 + struct statfs fsd; - if (statfs (path, &fsd) < 0) + if (statfs (file, &fsd, sizeof (struct statfs)) != 0) return -1; -#define convert_blocks(b) adjust_blocks ((b), fsd.f_bsize, 512) -#endif -#ifdef STAT_STATFS2_FSIZE /* 4.4BSD. */ + 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 (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. */ + 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 (path, &fsd, sizeof fsd, 0) < 0) + 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. */ -#define convert_blocks(b) (b) -#ifndef _SEQUENT_ /* _SEQUENT_ is DYNIX/ptx. */ -#define f_bavail f_bfree -#endif +# if _AIX || defined _CRAY + fsp->fsu_blocksize = PROPAGATE_ALL_ONES (fsd.f_bsize); +# else + fsp->fsu_blocksize = 512; +# endif + #endif -#ifdef STAT_STATVFS /* SVR4. */ - struct statvfs fsd; +#if (defined STAT_STATVFS \ + || (!defined STAT_STATFS2_FS_DATA && !defined STAT_READ_FILSYS)) - 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) /* !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 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; @@ -191,4 +260,5 @@ statfs (path, fsb) fsb->f_fsid.val[1] = fsd.du_pckno; return 0; } + #endif /* _AIX && _I386 */