vfs_syscalls_20.c revision 1.15
1 /* $NetBSD: vfs_syscalls_20.c,v 1.15 2006/11/16 01:32:41 christos 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 1.15 2006/11/16 01:32:41 christos 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(struct lwp *l, void *v, register_t *retval) 142 { 143 struct compat_20_sys_statfs_args /* { 144 syscallarg(const char *) path; 145 syscallarg(struct statfs12 *) buf; 146 } */ *uap = v; 147 struct mount *mp; 148 struct statvfs *sbuf; 149 int error = 0; 150 struct nameidata nd; 151 152 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 153 if ((error = namei(&nd)) != 0) 154 return error; 155 156 mp = nd.ni_vp->v_mount; 157 vrele(nd.ni_vp); 158 159 sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK); 160 if ((error = dostatvfs(mp, sbuf, l, 0, 1)) != 0) 161 goto done; 162 163 error = vfs2fs(SCARG(uap, buf), sbuf); 164 done: 165 free(sbuf, M_TEMP); 166 return error; 167 } 168 169 /* 170 * Get filesystem statistics. 171 */ 172 /* ARGSUSED */ 173 int 174 compat_20_sys_fstatfs(struct lwp *l, void *v, register_t *retval) 175 { 176 struct compat_20_sys_fstatfs_args /* { 177 syscallarg(int) fd; 178 syscallarg(struct statfs12 *) buf; 179 } */ *uap = v; 180 struct proc *p = l->l_proc; 181 struct file *fp; 182 struct mount *mp; 183 struct statvfs *sbuf; 184 int error; 185 186 /* getvnode() will use the descriptor for us */ 187 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 188 return (error); 189 mp = ((struct vnode *)fp->f_data)->v_mount; 190 sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK); 191 if ((error = dostatvfs(mp, sbuf, l, 0, 1)) != 0) 192 goto out; 193 error = vfs2fs(SCARG(uap, buf), sbuf); 194 out: 195 FILE_UNUSE(fp, l); 196 free(sbuf, M_TEMP); 197 return error; 198 } 199 200 201 /* 202 * Get statistics on all filesystems. 203 */ 204 int 205 compat_20_sys_getfsstat(l, v, retval) 206 struct lwp *l; 207 void *v; 208 register_t *retval; 209 { 210 struct compat_20_sys_getfsstat_args /* { 211 syscallarg(struct statfs12 *) buf; 212 syscallarg(long) bufsize; 213 syscallarg(int) flags; 214 } */ *uap = v; 215 int root = 0; 216 struct mount *mp, *nmp; 217 struct statvfs *sbuf; 218 struct statfs12 *sfsp; 219 size_t count, maxcount; 220 int error = 0; 221 222 sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK); 223 maxcount = (size_t)SCARG(uap, bufsize) / sizeof(struct statfs12); 224 sfsp = SCARG(uap, buf); 225 simple_lock(&mountlist_slock); 226 count = 0; 227 for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist; 228 mp = nmp) { 229 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 230 nmp = CIRCLEQ_NEXT(mp, mnt_list); 231 continue; 232 } 233 if (sfsp && count < maxcount) { 234 error = dostatvfs(mp, sbuf, l, SCARG(uap, flags), 0); 235 if (error) { 236 simple_lock(&mountlist_slock); 237 nmp = CIRCLEQ_NEXT(mp, mnt_list); 238 vfs_unbusy(mp); 239 continue; 240 } 241 error = vfs2fs(sfsp, sbuf); 242 if (error) { 243 vfs_unbusy(mp); 244 goto out; 245 } 246 sfsp++; 247 root |= strcmp(sbuf->f_mntonname, "/") == 0; 248 } 249 count++; 250 simple_lock(&mountlist_slock); 251 nmp = CIRCLEQ_NEXT(mp, mnt_list); 252 vfs_unbusy(mp); 253 } 254 simple_unlock(&mountlist_slock); 255 if (root == 0 && l->l_proc->p_cwdi->cwdi_rdir) { 256 /* 257 * fake a root entry 258 */ 259 if ((error = dostatvfs(l->l_proc->p_cwdi->cwdi_rdir->v_mount, 260 sbuf, l, SCARG(uap, flags), 1)) != 0) 261 goto out; 262 if (sfsp) 263 error = vfs2fs(sfsp, sbuf); 264 count++; 265 } 266 if (sfsp && count > maxcount) 267 *retval = maxcount; 268 else 269 *retval = count; 270 out: 271 free(sbuf, M_TEMP); 272 return error; 273 } 274 275 int 276 compat_20_sys_fhstatfs(struct lwp *l, void *v, register_t *retval) 277 { 278 struct compat_20_sys_fhstatfs_args /* 279 syscallarg(const struct compat_30_fhandle *) fhp; 280 syscallarg(struct statfs12 *) buf; 281 } */ *uap = v; 282 struct statvfs *sbuf; 283 struct compat_30_fhandle fh; 284 struct mount *mp; 285 struct vnode *vp; 286 int error; 287 288 /* 289 * Must be super user 290 */ 291 if ((error = kauth_authorize_system(l->l_cred, 292 KAUTH_SYSTEM_FILEHANDLE, 0, NULL, NULL, NULL))) 293 return (error); 294 295 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fh))) != 0) 296 return (error); 297 298 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 299 return (ESTALE); 300 if ((error = VFS_FHTOVP(mp, (struct fid*)&fh.fh_fid, &vp))) 301 return (error); 302 mp = vp->v_mount; 303 vput(vp); 304 sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK); 305 if ((error = VFS_STATVFS(mp, sbuf, l)) != 0) 306 goto out; 307 error = vfs2fs(SCARG(uap, buf), sbuf); 308 out: 309 free(sbuf, M_TEMP); 310 return error; 311 } 312
Indexes created Tue Sep 30 11:09:46 GMT 2025