1 /* 2 * Copyright 2002 Massachusetts Institute of Technology 3 * 4 * Permission to use, copy, modify, and distribute this software and 5 * its documentation for any purpose and without fee is hereby 6 * granted, provided that both the above copyright notice and this 7 * permission notice appear in all copies, that both the above 8 * copyright notice and this permission notice appear in all 9 * supporting documentation, and that the name of M.I.T. not be used 10 * in advertising or publicity pertaining to distribution of the 11 * software without specific, written prior permission. M.I.T. makes 12 * no representations about the suitability of this software for any 13 * purpose. It is provided "as is" without express or implied 14 * warranty. 15 * 16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include "namespace.h" 34 #include <sys/param.h> 35 #include <sys/mount.h> 36 #include <sys/statvfs.h> 37 38 #include <errno.h> 39 #include <limits.h> 40 #include <unistd.h> 41 #include "un-namespace.h" 42 43 static int sfs2svfs(const struct statfs *from, struct statvfs *to); 44 45 int 46 fstatvfs(int fd, struct statvfs *result) 47 { 48 struct statfs sfs; 49 int rv; 50 long pcval; 51 52 rv = _fstatfs(fd, &sfs); 53 if (rv != 0) 54 return (rv); 55 56 rv = sfs2svfs(&sfs, result); 57 if (rv != 0) 58 return (rv); 59 60 /* 61 * Whether pathconf's -1 return means error or unlimited does not 62 * make any difference in this best-effort implementation. 63 */ 64 pcval = _fpathconf(fd, _PC_NAME_MAX); 65 if (pcval == -1) 66 result->f_namemax = ~0UL; 67 else 68 result->f_namemax = (unsigned long)pcval; 69 return (0); 70 } 71 72 int 73 statvfs(const char * __restrict path, struct statvfs * __restrict result) 74 { 75 struct statfs sfs; 76 int rv; 77 long pcval; 78 79 rv = statfs(path, &sfs); 80 if (rv != 0) 81 return (rv); 82 83 sfs2svfs(&sfs, result); 84 85 /* 86 * Whether pathconf's -1 return means error or unlimited does not 87 * make any difference in this best-effort implementation. 88 */ 89 pcval = pathconf(path, _PC_NAME_MAX); 90 if (pcval == -1) 91 result->f_namemax = ~0UL; 92 else 93 result->f_namemax = (unsigned long)pcval; 94 return (0); 95 } 96 97 static int 98 sfs2svfs(const struct statfs *from, struct statvfs *to) 99 { 100 static const struct statvfs zvfs; 101 102 *to = zvfs; 103 104 if (from->f_flags & MNT_RDONLY) 105 to->f_flag |= ST_RDONLY; 106 if (from->f_flags & MNT_NOSUID) 107 to->f_flag |= ST_NOSUID; 108 109 /* XXX should we clamp negative values? */ 110 #define COPY(field) \ 111 do { \ 112 to->field = from->field; \ 113 if (from->field != to->field) { \ 114 errno = EOVERFLOW; \ 115 return (-1); \ 116 } \ 117 } while(0) 118 119 COPY(f_bavail); 120 COPY(f_bfree); 121 COPY(f_blocks); 122 COPY(f_ffree); 123 COPY(f_files); 124 to->f_bsize = from->f_iosize; 125 to->f_frsize = from->f_bsize; 126 to->f_favail = to->f_ffree; 127 return (0); 128 } 129 130 #ifdef MAIN 131 #include <err.h> 132 #include <stdint.h> 133 #include <stdio.h> 134 135 int 136 main(int argc, char **argv) 137 { 138 struct statvfs buf; 139 140 if (statvfs(argv[1], &buf) < 0) 141 err(1, "statvfs"); 142 143 #define SHOW(field) \ 144 printf(#field ": %ju\n", (uintmax_t)buf.field) 145 146 SHOW(f_bavail); 147 SHOW(f_bfree); 148 SHOW(f_blocks); 149 SHOW(f_favail); 150 SHOW(f_ffree); 151 SHOW(f_files); 152 SHOW(f_bsize); 153 SHOW(f_frsize); 154 SHOW(f_namemax); 155 printf("f_flag: %lx\n", (unsigned long)buf.f_flag); 156 157 return 0; 158 } 159 160 #endif /* MAIN */ 161