1 /* $NetBSD: vfs_syscalls_20.c,v 1.19 2007/11/01 03:49:52 oster 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 1.19 2007/11/01 03:49:52 oster Exp $"); 41 42 #include "opt_compat_netbsd.h" 43 #include "opt_compat_43.h" 44 #include "fss.h" 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 #ifdef COMPAT_09 66 #define MOUNTNO_NONE 0 67 #define MOUNTNO_UFS 1 /* UNIX "Fast" Filesystem */ 68 #define MOUNTNO_NFS 2 /* Network Filesystem */ 69 #define MOUNTNO_MFS 3 /* Memory Filesystem */ 70 #define MOUNTNO_MSDOS 4 /* MSDOS Filesystem */ 71 #define MOUNTNO_CD9660 5 /* iso9660 cdrom */ 72 #define MOUNTNO_FDESC 6 /* /dev/fd filesystem */ 73 #define MOUNTNO_KERNFS 7 /* kernel variable filesystem */ 74 #define MOUNTNO_DEVFS 8 /* device node filesystem */ 75 #define MOUNTNO_AFS 9 /* AFS 3.x */ 76 static const struct { 77 const char *name; 78 const int value; 79 } nv[] = { 80 { MOUNT_UFS, MOUNTNO_UFS }, 81 { MOUNT_NFS, MOUNTNO_NFS }, 82 { MOUNT_MFS, MOUNTNO_MFS }, 83 { MOUNT_MSDOS, MOUNTNO_MSDOS }, 84 { MOUNT_CD9660, MOUNTNO_CD9660 }, 85 { MOUNT_FDESC, MOUNTNO_FDESC }, 86 { MOUNT_KERNFS, MOUNTNO_KERNFS }, 87 { MOUNT_AFS, MOUNTNO_AFS }, 88 }; 89 #endif 90 91 static int 92 vfs2fs(struct statfs12 *bfs, const struct statvfs *fs) 93 { 94 struct statfs12 ofs; 95 #ifdef COMPAT_09 96 int i = 0; 97 ofs.f_type = 0; 98 ofs.f_oflags = (short)fs->f_flag; 99 100 for (i = 0; i < sizeof(nv) / sizeof(nv[0]); i++) { 101 if (strcmp(nv[i].name, fs->f_fstypename) == 0) { 102 ofs.f_type = nv[i].value; 103 break; 104 } 105 } 106 #else 107 ofs.f_type = 0; 108 #endif 109 #define CLAMP(a) (long)(((a) & ~LONG_MAX) ? LONG_MAX : (a)) 110 ofs.f_bsize = CLAMP(fs->f_frsize); 111 ofs.f_iosize = CLAMP(fs->f_iosize); 112 ofs.f_blocks = CLAMP(fs->f_blocks); 113 ofs.f_bfree = CLAMP(fs->f_bfree); 114 if (fs->f_bfree > fs->f_bresvd) 115 ofs.f_bavail = CLAMP(fs->f_bfree - fs->f_bresvd); 116 else 117 ofs.f_bavail = -CLAMP(fs->f_bresvd - fs->f_bfree); 118 ofs.f_files = CLAMP(fs->f_files); 119 ofs.f_ffree = CLAMP(fs->f_ffree); 120 ofs.f_fsid = fs->f_fsidx; 121 ofs.f_owner = fs->f_owner; 122 ofs.f_flags = (long)fs->f_flag; 123 ofs.f_syncwrites = CLAMP(fs->f_syncwrites); 124 ofs.f_asyncwrites = CLAMP(fs->f_asyncwrites); 125 (void)strncpy(ofs.f_fstypename, fs->f_fstypename, 126 sizeof(ofs.f_fstypename)); 127 (void)strncpy(ofs.f_mntonname, fs->f_mntonname, 128 sizeof(ofs.f_mntonname)); 129 (void)strncpy(ofs.f_mntfromname, fs->f_mntfromname, 130 sizeof(ofs.f_mntfromname)); 131 132 return copyout(&ofs, bfs, sizeof(ofs)); 133 } 134 135 /* 136 * Get filesystem statistics. 137 */ 138 /* ARGSUSED */ 139 int 140 compat_20_sys_statfs(struct lwp *l, void *v, register_t *retval) 141 { 142 struct compat_20_sys_statfs_args /* { 143 syscallarg(const char *) path; 144 syscallarg(struct statfs12 *) buf; 145 } */ *uap = v; 146 struct mount *mp; 147 struct statvfs *sbuf; 148 int error = 0; 149 struct nameidata nd; 150 151 NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path), l); 152 if ((error = namei(&nd)) != 0) 153 return error; 154 155 mp = nd.ni_vp->v_mount; 156 vrele(nd.ni_vp); 157 158 sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK); 159 if ((error = dostatvfs(mp, sbuf, l, 0, 1)) != 0) 160 goto done; 161 162 error = vfs2fs(SCARG(uap, buf), sbuf); 163 done: 164 free(sbuf, M_TEMP); 165 return error; 166 } 167 168 /* 169 * Get filesystem statistics. 170 */ 171 /* ARGSUSED */ 172 int 173 compat_20_sys_fstatfs(struct lwp *l, void *v, register_t *retval) 174 { 175 struct compat_20_sys_fstatfs_args /* { 176 syscallarg(int) fd; 177 syscallarg(struct statfs12 *) buf; 178 } */ *uap = v; 179 struct proc *p = l->l_proc; 180 struct file *fp; 181 struct mount *mp; 182 struct statvfs *sbuf; 183 int error; 184 185 /* getvnode() will use the descriptor for us */ 186 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 187 return (error); 188 mp = ((struct vnode *)fp->f_data)->v_mount; 189 sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK); 190 if ((error = dostatvfs(mp, sbuf, l, 0, 1)) != 0) 191 goto out; 192 error = vfs2fs(SCARG(uap, buf), sbuf); 193 out: 194 FILE_UNUSE(fp, l); 195 free(sbuf, M_TEMP); 196 return error; 197 } 198 199 200 /* 201 * Get statistics on all filesystems. 202 */ 203 int 204 compat_20_sys_getfsstat(l, v, retval) 205 struct lwp *l; 206 void *v; 207 register_t *retval; 208 { 209 struct compat_20_sys_getfsstat_args /* { 210 syscallarg(struct statfs12 *) buf; 211 syscallarg(long) bufsize; 212 syscallarg(int) flags; 213 } */ *uap = v; 214 int root = 0; 215 struct mount *mp, *nmp; 216 struct statvfs *sbuf; 217 struct statfs12 *sfsp; 218 size_t count, maxcount; 219 int error = 0; 220 221 sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK); 222 maxcount = (size_t)SCARG(uap, bufsize) / sizeof(struct statfs12); 223 sfsp = SCARG(uap, buf); 224 mutex_enter(&mountlist_lock); 225 count = 0; 226 for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist; 227 mp = nmp) { 228 if (vfs_busy(mp, LK_NOWAIT, &mountlist_lock)) { 229 nmp = CIRCLEQ_NEXT(mp, mnt_list); 230 continue; 231 } 232 if (sfsp && count < maxcount) { 233 error = dostatvfs(mp, sbuf, l, SCARG(uap, flags), 0); 234 if (error) { 235 mutex_enter(&mountlist_lock); 236 nmp = CIRCLEQ_NEXT(mp, mnt_list); 237 vfs_unbusy(mp); 238 continue; 239 } 240 error = vfs2fs(sfsp, sbuf); 241 if (error) { 242 vfs_unbusy(mp); 243 goto out; 244 } 245 sfsp++; 246 root |= strcmp(sbuf->f_mntonname, "/") == 0; 247 } 248 count++; 249 mutex_enter(&mountlist_lock); 250 nmp = CIRCLEQ_NEXT(mp, mnt_list); 251 vfs_unbusy(mp); 252 } 253 mutex_exit(&mountlist_lock); 254 if (root == 0 && l->l_proc->p_cwdi->cwdi_rdir) { 255 /* 256 * fake a root entry 257 */ 258 if ((error = dostatvfs(l->l_proc->p_cwdi->cwdi_rdir->v_mount, 259 sbuf, l, SCARG(uap, flags), 1)) != 0) 260 goto out; 261 if (sfsp) 262 error = vfs2fs(sfsp, sbuf); 263 count++; 264 } 265 if (sfsp && count > maxcount) 266 *retval = maxcount; 267 else 268 *retval = count; 269 out: 270 free(sbuf, M_TEMP); 271 return error; 272 } 273 274 int 275 compat_20_sys_fhstatfs(struct lwp *l, void *v, register_t *retval) 276 { 277 struct compat_20_sys_fhstatfs_args /* 278 syscallarg(const struct compat_30_fhandle *) fhp; 279 syscallarg(struct statfs12 *) buf; 280 } */ *uap = v; 281 struct statvfs *sbuf; 282 struct compat_30_fhandle fh; 283 struct mount *mp; 284 struct vnode *vp; 285 int error; 286 287 /* 288 * Must be super user 289 */ 290 if ((error = kauth_authorize_system(l->l_cred, 291 KAUTH_SYSTEM_FILEHANDLE, 0, NULL, NULL, NULL))) 292 return (error); 293 294 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fh))) != 0) 295 return (error); 296 297 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 298 return (ESTALE); 299 if ((error = VFS_FHTOVP(mp, (struct fid*)&fh.fh_fid, &vp))) 300 return (error); 301 mp = vp->v_mount; 302 vput(vp); 303 sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK); 304 if ((error = VFS_STATVFS(mp, sbuf, l)) != 0) 305 goto out; 306 error = vfs2fs(SCARG(uap, buf), sbuf); 307 out: 308 free(sbuf, M_TEMP); 309 return error; 310 } 311