X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Ffsusage.c;h=0657555f44d17805e7c90d8e4d6d5ae41296522a;hb=23eecb48e39afd0d267d64d40ba6bf97aa865e13;hp=99dcbc3c2532c2a3bc5dd55f59b2cccbda6a1633;hpb=e0be8461f5acc1b0b11684deb224a48e4bd96eb9;p=gnulib.git diff --git a/lib/fsusage.c b/lib/fsusage.c index 99dcbc3c2..0657555f4 100644 --- a/lib/fsusage.c +++ b/lib/fsusage.c @@ -1,10 +1,12 @@ -/* 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, 2009-2013 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 @@ -12,201 +14,305 @@ 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. */ - -#ifdef HAVE_CONFIG_H -#if defined (CONFIG_BROKETS) -/* We use instead of "config.h" so that a compilation - using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h - (which it would do because it found this file in $srcdir). */ + along with this program. If not, see . */ + #include -#else -#include "config.h" -#endif -#endif -#include #include "fsusage.h" -int statfs (); +#include +#include -#if defined (STAT_STATFS3_OSF1) /* DEC Alpha running OSF/1 */ -# include +#if STAT_STATVFS || STAT_STATVFS64 /* 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 defined(STAT_STATFS2_BSIZE) && !defined(_IBMR2) /* 4.3BSD, SunOS 4, HP-UX, AIX PS/2. */ -#include +#if HAVE_SYS_MOUNT_H +# include #endif - -#ifdef STAT_STATFS2_FSIZE /* 4.4BSD. */ -#include +#if HAVE_SYS_VFS_H +# include #endif - -#ifdef STAT_STATFS2_FS_DATA /* Ultrix. */ -#include -#include +# 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 -#ifdef STAT_READ /* SVR2. */ -#include -#include -#include +/* 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 /* for strverscmp */ +# include +# include +# define STAT_STATFS2_BSIZE 1 + +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 -#if defined(STAT_STATFS4) || (defined(_AIX) && defined(_IBMR2)) /* SVR3, Dynix, Irix, AIX RS6000. */ -#include -#endif -#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) +{ +#ifdef STAT_STATVFS /* POSIX, except pre-2.6.36 glibc/Linux */ + + 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; + } -#ifdef STAT_STATVFS /* SVR4. */ -#include -int statvfs (); #endif -/* Return the number of TOSIZE-byte blocks used by - BLOCKS FROMSIZE-byte blocks, rounding away from zero. */ +#if defined STAT_STATVFS64 /* AIX */ -static long -adjust_blocks (blocks, fromsize, tosize) - long blocks; - int fromsize, tosize; -{ - 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) - char *path, *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 /* 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 /* OSF/1 */ + 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_FRSIZE /* 2.6 < glibc/Linux < 2.6.36 */ + 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_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 (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 and older NetBSD */ + + 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, 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. */ -#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 +# 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_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) /* !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; @@ -221,4 +327,5 @@ statfs (path, fsb) fsb->f_fsid.val[1] = fsd.du_pckno; return 0; } + #endif /* _AIX && _I386 */