vfs_syscalls_20.c revision 1.12
1 /* $NetBSD: vfs_syscalls_20.c,v 1.12 2006/07/23 22:06:08 ad 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 1.12 2006/07/23 22:06:08 ad 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/sa.h> 61 #include <sys/syscallargs.h> 62 #include <sys/kauth.h> 63 64 #include <compat/sys/mount.h> 65 66 #ifdef COMPAT_09 67 #define MOUNTNO_NONE 0 68 #define MOUNTNO_UFS 1 /* UNIX "Fast" Filesystem */ 69 #define MOUNTNO_NFS 2 /* Network Filesystem */ 70 #define MOUNTNO_MFS 3 /* Memory Filesystem */ 71 #define MOUNTNO_MSDOS 4 /* MSDOS Filesystem */ 72 #define MOUNTNO_CD9660 5 /* iso9660 cdrom */ 73 #define MOUNTNO_FDESC 6 /* /dev/fd filesystem */ 74 #define MOUNTNO_KERNFS 7 /* kernel variable filesystem */ 75 #define MOUNTNO_DEVFS 8 /* device node filesystem */ 76 #define MOUNTNO_AFS 9 /* AFS 3.x */ 77 static const struct { 78 const char *name; 79 const int value; 80 } nv[] = { 81 { MOUNT_UFS, MOUNTNO_UFS }, 82 { MOUNT_NFS, MOUNTNO_NFS }, 83 { MOUNT_MFS, MOUNTNO_MFS }, 84 { MOUNT_MSDOS, MOUNTNO_MSDOS }, 85 { MOUNT_CD9660, MOUNTNO_CD9660 }, 86 { MOUNT_FDESC, MOUNTNO_FDESC }, 87 { MOUNT_KERNFS, MOUNTNO_KERNFS }, 88 { MOUNT_AFS, MOUNTNO_AFS }, 89 }; 90 #endif 91 92 static int 93 vfs2fs(struct statfs12 *bfs, const struct statvfs *fs) 94 { 95 struct statfs12 ofs; 96 #ifdef COMPAT_09 97 int i = 0; 98 ofs.f_type = 0; 99 ofs.f_oflags = (short)fs->f_flag; 100 101 for (i = 0; i < sizeof(nv) / sizeof(nv[0]); i++) { 102 if (strcmp(nv[i].name, fs->f_fstypename) == 0) { 103 ofs.f_type = nv[i].value; 104 break; 105 } 106 } 107 #else 108 ofs.f_type = 0; 109 #endif 110 #define CLAMP(a) (long)(((a) & ~LONG_MAX) ? LONG_MAX : (a)) 111 ofs.f_bsize = CLAMP(fs->f_frsize); 112 ofs.f_iosize = CLAMP(fs->f_iosize); 113 ofs.f_blocks = CLAMP(fs->f_blocks); 114 ofs.f_bfree = CLAMP(fs->f_bfree); 115 if (fs->f_bfree > fs->f_bresvd) 116 ofs.f_bavail = CLAMP(fs->f_bfree - fs->f_bresvd); 117 else 118 ofs.f_bavail = -CLAMP(fs->f_bresvd - fs->f_bfree); 119 ofs.f_files = CLAMP(fs->f_files); 120 ofs.f_ffree = CLAMP(fs->f_ffree); 121 ofs.f_fsid = fs->f_fsidx; 122 ofs.f_owner = fs->f_owner; 123 ofs.f_flags = (long)fs->f_flag; 124 ofs.f_syncwrites = CLAMP(fs->f_syncwrites); 125 ofs.f_asyncwrites = CLAMP(fs->f_asyncwrites); 126 (void)strncpy(ofs.f_fstypename, fs->f_fstypename, 127 sizeof(ofs.f_fstypename)); 128 (void)strncpy(ofs.f_mntonname, fs->f_mntonname, 129 sizeof(ofs.f_mntonname)); 130 (void)strncpy(ofs.f_mntfromname, fs->f_mntfromname, 131 sizeof(ofs.f_mntfromname)); 132 133 return copyout(&ofs, bfs, sizeof(ofs)); 134 } 135 136 /* 137 * Get filesystem statistics. 138 */ 139 /* ARGSUSED */ 140 int 141 compat_20_sys_statfs(l, v, retval) 142 struct lwp *l; 143 void *v; 144 register_t *retval; 145 { 146 struct compat_20_sys_statfs_args /* { 147 syscallarg(const char *) path; 148 syscallarg(struct statfs12 *) buf; 149 } */ *uap = v; 150 struct mount *mp; 151 struct statvfs *sbuf; 152 int error = 0; 153 struct nameidata nd; 154 155 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 156 if ((error = namei(&nd)) != 0) 157 return error; 158 159 mp = nd.ni_vp->v_mount; 160 vrele(nd.ni_vp); 161 162 sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK); 163 if ((error = dostatvfs(mp, sbuf, l, 0, 1)) != 0) 164 goto done; 165 166 error = vfs2fs(SCARG(uap, buf), sbuf); 167 done: 168 free(sbuf, M_TEMP); 169 return error; 170 } 171 172 /* 173 * Get filesystem statistics. 174 */ 175 /* ARGSUSED */ 176 int 177 compat_20_sys_fstatfs(l, v, retval) 178 struct lwp *l; 179 void *v; 180 register_t *retval; 181 { 182 struct compat_20_sys_fstatfs_args /* { 183 syscallarg(int) fd; 184 syscallarg(struct statfs12 *) buf; 185 } */ *uap = v; 186 struct proc *p = l->l_proc; 187 struct file *fp; 188 struct mount *mp; 189 struct statvfs *sbuf; 190 int error; 191 192 /* getvnode() will use the descriptor for us */ 193 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 194 return (error); 195 mp = ((struct vnode *)fp->f_data)->v_mount; 196 sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK); 197 if ((error = dostatvfs(mp, sbuf, l, 0, 1)) != 0) 198 goto out; 199 error = vfs2fs(SCARG(uap, buf), sbuf); 200 out: 201 FILE_UNUSE(fp, l); 202 free(sbuf, M_TEMP); 203 return error; 204 } 205 206 207 /* 208 * Get statistics on all filesystems. 209 */ 210 int 211 compat_20_sys_getfsstat(l, v, retval) 212 struct lwp *l; 213 void *v; 214 register_t *retval; 215 { 216 struct compat_20_sys_getfsstat_args /* { 217 syscallarg(struct statfs12 *) buf; 218 syscallarg(long) bufsize; 219 syscallarg(int) flags; 220 } */ *uap = v; 221 int root = 0; 222 struct mount *mp, *nmp; 223 struct statvfs *sbuf; 224 struct statfs12 *sfsp; 225 size_t count, maxcount; 226 int error = 0; 227 228 sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK); 229 maxcount = (size_t)SCARG(uap, bufsize) / sizeof(struct statfs12); 230 sfsp = SCARG(uap, buf); 231 simple_lock(&mountlist_slock); 232 count = 0; 233 for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist; 234 mp = nmp) { 235 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 236 nmp = CIRCLEQ_NEXT(mp, mnt_list); 237 continue; 238 } 239 if (sfsp && count < maxcount) { 240 error = dostatvfs(mp, sbuf, l, SCARG(uap, flags), 0); 241 if (error) { 242 simple_lock(&mountlist_slock); 243 nmp = CIRCLEQ_NEXT(mp, mnt_list); 244 vfs_unbusy(mp); 245 continue; 246 } 247 error = vfs2fs(sfsp, sbuf); 248 if (error) { 249 vfs_unbusy(mp); 250 goto out; 251 } 252 sfsp++; 253 root |= strcmp(sbuf->f_mntonname, "/") == 0; 254 } 255 count++; 256 simple_lock(&mountlist_slock); 257 nmp = CIRCLEQ_NEXT(mp, mnt_list); 258 vfs_unbusy(mp); 259 } 260 simple_unlock(&mountlist_slock); 261 if (root == 0 && l->l_proc->p_cwdi->cwdi_rdir) { 262 /* 263 * fake a root entry 264 */ 265 if ((error = dostatvfs(l->l_proc->p_cwdi->cwdi_rdir->v_mount, 266 sbuf, l, SCARG(uap, flags), 1)) != 0) 267 goto out; 268 if (sfsp) 269 error = vfs2fs(sfsp, sbuf); 270 count++; 271 } 272 if (sfsp && count > maxcount) 273 *retval = maxcount; 274 else 275 *retval = count; 276 out: 277 free(sbuf, M_TEMP); 278 return error; 279 } 280 281 int 282 compat_20_sys_fhstatfs(l, v, retval) 283 struct lwp *l; 284 void *v; 285 register_t *retval; 286 { 287 struct compat_20_sys_fhstatfs_args /* 288 syscallarg(const struct compat_30_fhandle *) fhp; 289 syscallarg(struct statfs12 *) buf; 290 } */ *uap = v; 291 struct statvfs *sbuf; 292 struct compat_30_fhandle fh; 293 struct mount *mp; 294 struct vnode *vp; 295 int error; 296 297 /* 298 * Must be super user 299 */ 300 if ((error = kauth_authorize_generic(l->l_cred, 301 KAUTH_GENERIC_ISSUSER, &l->l_acflag))) 302 return (error); 303 304 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fh))) != 0) 305 return (error); 306 307 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 308 return (ESTALE); 309 if ((error = VFS_FHTOVP(mp, (struct fid*)&fh.fh_fid, &vp))) 310 return (error); 311 mp = vp->v_mount; 312 vput(vp); 313 sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK); 314 if ((error = VFS_STATVFS(mp, sbuf, l)) != 0) 315 goto out; 316 error = vfs2fs(SCARG(uap, buf), sbuf); 317 out: 318 free(sbuf, M_TEMP); 319 return error; 320 } 321
Indexes created Tue Sep 30 07:10:03 GMT 2025