vfs_syscalls_20.c revision 1.40
1 /* $NetBSD: vfs_syscalls_20.c,v 1.40 2017/04/13 09:41:28 hannken Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)vfs_syscalls.c 8.42 (Berkeley) 7/31/95 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: vfs_syscalls_20.c,v 1.40 2017/04/13 09:41:28 hannken Exp $"); 41 42 #ifdef _KERNEL_OPT 43 #include "opt_compat_netbsd.h" 44 #endif 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/namei.h> 49 #include <sys/filedesc.h> 50 #include <sys/kernel.h> 51 #include <sys/file.h> 52 #include <sys/stat.h> 53 #include <sys/vnode.h> 54 #include <sys/mount.h> 55 #include <sys/proc.h> 56 #include <sys/uio.h> 57 #include <sys/malloc.h> 58 #include <sys/dirent.h> 59 #include <sys/sysctl.h> 60 #include <sys/syscallargs.h> 61 #include <sys/kauth.h> 62 63 #include <compat/sys/mount.h> 64 65 #define MOUNTNO_NONE 0 66 #define MOUNTNO_UFS 1 /* UNIX "Fast" Filesystem */ 67 #define MOUNTNO_NFS 2 /* Network Filesystem */ 68 #define MOUNTNO_MFS 3 /* Memory Filesystem */ 69 #define MOUNTNO_MSDOS 4 /* MSDOS Filesystem */ 70 #define MOUNTNO_CD9660 5 /* iso9660 cdrom */ 71 #define MOUNTNO_FDESC 6 /* /dev/fd filesystem */ 72 #define MOUNTNO_KERNFS 7 /* kernel variable filesystem */ 73 #define MOUNTNO_DEVFS 8 /* device node filesystem */ 74 #define MOUNTNO_AFS 9 /* AFS 3.x */ 75 static const struct { 76 const char *name; 77 const int value; 78 } nv[] = { 79 { MOUNT_UFS, MOUNTNO_UFS }, 80 { MOUNT_NFS, MOUNTNO_NFS }, 81 { MOUNT_MFS, MOUNTNO_MFS }, 82 { MOUNT_MSDOS, MOUNTNO_MSDOS }, 83 { MOUNT_CD9660, MOUNTNO_CD9660 }, 84 { MOUNT_FDESC, MOUNTNO_FDESC }, 85 { MOUNT_KERNFS, MOUNTNO_KERNFS }, 86 { MOUNT_AFS, MOUNTNO_AFS }, 87 }; 88 89 static int 90 vfs2fs(struct statfs12 *bfs, const struct statvfs *fs) 91 { 92 struct statfs12 ofs; 93 int i; 94 ofs.f_type = 0; 95 ofs.f_oflags = (short)fs->f_flag; 96 97 for (i = 0; i < sizeof(nv) / sizeof(nv[0]); i++) { 98 if (strcmp(nv[i].name, fs->f_fstypename) == 0) { 99 ofs.f_type = nv[i].value; 100 break; 101 } 102 } 103 #define CLAMP(a) (long)(((a) & ~LONG_MAX) ? LONG_MAX : (a)) 104 ofs.f_bsize = CLAMP(fs->f_frsize); 105 ofs.f_iosize = CLAMP(fs->f_iosize); 106 ofs.f_blocks = CLAMP(fs->f_blocks); 107 ofs.f_bfree = CLAMP(fs->f_bfree); 108 if (fs->f_bfree > fs->f_bresvd) 109 ofs.f_bavail = CLAMP(fs->f_bfree - fs->f_bresvd); 110 else 111 ofs.f_bavail = -CLAMP(fs->f_bresvd - fs->f_bfree); 112 ofs.f_files = CLAMP(fs->f_files); 113 ofs.f_ffree = CLAMP(fs->f_ffree); 114 ofs.f_fsid = fs->f_fsidx; 115 ofs.f_owner = fs->f_owner; 116 ofs.f_flags = (long)fs->f_flag; 117 ofs.f_syncwrites = CLAMP(fs->f_syncwrites); 118 ofs.f_asyncwrites = CLAMP(fs->f_asyncwrites); 119 (void)strncpy(ofs.f_fstypename, fs->f_fstypename, 120 sizeof(ofs.f_fstypename)); 121 (void)strncpy(ofs.f_mntonname, fs->f_mntonname, 122 sizeof(ofs.f_mntonname)); 123 (void)strncpy(ofs.f_mntfromname, fs->f_mntfromname, 124 sizeof(ofs.f_mntfromname)); 125 126 return copyout(&ofs, bfs, sizeof(ofs)); 127 } 128 129 /* 130 * Get filesystem statistics. 131 */ 132 /* ARGSUSED */ 133 int 134 compat_20_sys_statfs(struct lwp *l, const struct compat_20_sys_statfs_args *uap, register_t *retval) 135 { 136 /* { 137 syscallarg(const char *) path; 138 syscallarg(struct statfs12 *) buf; 139 } */ 140 struct mount *mp; 141 struct statvfs *sbuf; 142 int error; 143 struct vnode *vp; 144 145 error = namei_simple_user(SCARG(uap, path), 146 NSM_FOLLOW_TRYEMULROOT, &vp); 147 if (error != 0) 148 return error; 149 150 mp = vp->v_mount; 151 152 sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK); 153 if ((error = dostatvfs(mp, sbuf, l, 0, 1)) != 0) 154 goto done; 155 156 error = vfs2fs(SCARG(uap, buf), sbuf); 157 done: 158 vrele(vp); 159 free(sbuf, M_TEMP); 160 return error; 161 } 162 163 /* 164 * Get filesystem statistics. 165 */ 166 /* ARGSUSED */ 167 int 168 compat_20_sys_fstatfs(struct lwp *l, const struct compat_20_sys_fstatfs_args *uap, register_t *retval) 169 { 170 /* { 171 syscallarg(int) fd; 172 syscallarg(struct statfs12 *) buf; 173 } */ 174 struct file *fp; 175 struct mount *mp; 176 struct statvfs *sbuf; 177 int error; 178 179 /* fd_getvnode() will use the descriptor for us */ 180 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 181 return (error); 182 mp = fp->f_vnode->v_mount; 183 sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK); 184 if ((error = dostatvfs(mp, sbuf, l, 0, 1)) != 0) 185 goto out; 186 error = vfs2fs(SCARG(uap, buf), sbuf); 187 out: 188 fd_putfile(SCARG(uap, fd)); 189 free(sbuf, M_TEMP); 190 return error; 191 } 192 193 194 /* 195 * Get statistics on all filesystems. 196 */ 197 int 198 compat_20_sys_getfsstat(struct lwp *l, const struct compat_20_sys_getfsstat_args *uap, register_t *retval) 199 { 200 /* { 201 syscallarg(struct statfs12 *) buf; 202 syscallarg(long) bufsize; 203 syscallarg(int) flags; 204 } */ 205 int root = 0; 206 mount_iterator_t *iter; 207 struct mount *mp; 208 struct statvfs *sbuf; 209 struct statfs12 *sfsp; 210 size_t count, maxcount; 211 int error = 0; 212 213 sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK); 214 maxcount = (size_t)SCARG(uap, bufsize) / sizeof(struct statfs12); 215 sfsp = SCARG(uap, buf); 216 count = 0; 217 mountlist_iterator_init(&iter); 218 while ((mp = mountlist_iterator_next(iter)) != NULL) { 219 if (sfsp && count < maxcount) { 220 error = dostatvfs(mp, sbuf, l, SCARG(uap, flags), 0); 221 if (error) 222 continue; 223 error = vfs2fs(sfsp, sbuf); 224 if (error) 225 goto out; 226 sfsp++; 227 root |= strcmp(sbuf->f_mntonname, "/") == 0; 228 } 229 count++; 230 } 231 if (root == 0 && l->l_proc->p_cwdi->cwdi_rdir) { 232 /* 233 * fake a root entry 234 */ 235 if ((error = dostatvfs(l->l_proc->p_cwdi->cwdi_rdir->v_mount, 236 sbuf, l, SCARG(uap, flags), 1)) != 0) 237 goto out; 238 if (sfsp) 239 error = vfs2fs(sfsp, sbuf); 240 count++; 241 } 242 if (sfsp && count > maxcount) 243 *retval = maxcount; 244 else 245 *retval = count; 246 out: 247 mountlist_iterator_destroy(iter); 248 free(sbuf, M_TEMP); 249 return error; 250 } 251 252 int 253 compat_20_sys_fhstatfs(struct lwp *l, const struct compat_20_sys_fhstatfs_args *uap, register_t *retval) 254 { 255 /* { 256 syscallarg(const struct compat_30_fhandle *) fhp; 257 syscallarg(struct statfs12 *) buf; 258 } */ 259 struct statvfs *sbuf; 260 struct compat_30_fhandle fh; 261 struct mount *mp; 262 struct vnode *vp; 263 int error; 264 265 /* 266 * Must be super user 267 */ 268 if ((error = kauth_authorize_system(l->l_cred, 269 KAUTH_SYSTEM_FILEHANDLE, 0, NULL, NULL, NULL))) 270 return (error); 271 272 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fh))) != 0) 273 return (error); 274 275 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 276 return (ESTALE); 277 if ((error = VFS_FHTOVP(mp, (struct fid*)&fh.fh_fid, &vp))) 278 return (error); 279 mp = vp->v_mount; 280 VOP_UNLOCK(vp); 281 sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK); 282 if ((error = VFS_STATVFS(mp, sbuf)) != 0) 283 goto out; 284 error = vfs2fs(SCARG(uap, buf), sbuf); 285 out: 286 vrele(vp); 287 free(sbuf, M_TEMP); 288 return error; 289 } 290
Indexes created Tue Sep 30 07:10:03 GMT 2025