vfs_syscalls_20.c revision 1.6
1 /* $NetBSD: vfs_syscalls_20.c,v 1.6 2005/12/11 12:19:56 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 1.6 2005/12/11 12:19:56 christos Exp $"); 41 42 #include "opt_compat_netbsd.h" 43 #include "opt_compat_43.h" 44 #include "opt_ktrace.h" 45 #include "fss.h" 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/namei.h> 50 #include <sys/filedesc.h> 51 #include <sys/kernel.h> 52 #include <sys/file.h> 53 #include <sys/stat.h> 54 #include <sys/vnode.h> 55 #include <sys/mount.h> 56 #include <sys/proc.h> 57 #include <sys/uio.h> 58 #include <sys/malloc.h> 59 #include <sys/dirent.h> 60 #include <sys/sysctl.h> 61 #include <sys/sa.h> 62 #include <sys/syscallargs.h> 63 #ifdef KTRACE 64 #include <sys/ktrace.h> 65 #endif 66 67 #include <compat/sys/mount.h> 68 69 #ifdef COMPAT_09 70 #define MOUNTNO_NONE 0 71 #define MOUNTNO_UFS 1 /* UNIX "Fast" Filesystem */ 72 #define MOUNTNO_NFS 2 /* Network Filesystem */ 73 #define MOUNTNO_MFS 3 /* Memory Filesystem */ 74 #define MOUNTNO_MSDOS 4 /* MSDOS Filesystem */ 75 #define MOUNTNO_CD9660 5 /* iso9660 cdrom */ 76 #define MOUNTNO_FDESC 6 /* /dev/fd filesystem */ 77 #define MOUNTNO_KERNFS 7 /* kernel variable filesystem */ 78 #define MOUNTNO_DEVFS 8 /* device node filesystem */ 79 #define MOUNTNO_AFS 9 /* AFS 3.x */ 80 static const struct { 81 const char *name; 82 const int value; 83 } nv[] = { 84 { MOUNT_UFS, MOUNTNO_UFS }, 85 { MOUNT_NFS, MOUNTNO_NFS }, 86 { MOUNT_MFS, MOUNTNO_MFS }, 87 { MOUNT_MSDOS, MOUNTNO_MSDOS }, 88 { MOUNT_CD9660, MOUNTNO_CD9660 }, 89 { MOUNT_FDESC, MOUNTNO_FDESC }, 90 { MOUNT_KERNFS, MOUNTNO_KERNFS }, 91 { MOUNT_AFS, MOUNTNO_AFS }, 92 }; 93 #endif 94 95 static int 96 vfs2fs(struct statfs12 *bfs, const struct statvfs *fs) 97 { 98 struct statfs12 ofs; 99 #ifdef COMPAT_09 100 int i = 0; 101 ofs.f_type = 0; 102 ofs.f_oflags = (short)fs->f_flag; 103 104 for (i = 0; i < sizeof(nv) / sizeof(nv[0]); i++) { 105 if (strcmp(nv[i].name, fs->f_fstypename) == 0) { 106 ofs.f_type = nv[i].value; 107 break; 108 } 109 } 110 #else 111 ofs.f_type = 0; 112 #endif 113 #define CLAMP(a) (long)(((a) & ~LONG_MAX) ? LONG_MAX : (a)) 114 ofs.f_bsize = CLAMP(fs->f_frsize); 115 ofs.f_iosize = CLAMP(fs->f_iosize); 116 ofs.f_blocks = CLAMP(fs->f_blocks); 117 ofs.f_bfree = CLAMP(fs->f_bfree); 118 if (fs->f_bfree > fs->f_bresvd) 119 ofs.f_bavail = CLAMP(fs->f_bfree - fs->f_bresvd); 120 else 121 ofs.f_bavail = -CLAMP(fs->f_bresvd - fs->f_bfree); 122 ofs.f_files = CLAMP(fs->f_files); 123 ofs.f_ffree = CLAMP(fs->f_ffree); 124 ofs.f_fsid = fs->f_fsidx; 125 ofs.f_owner = fs->f_owner; 126 ofs.f_flags = (long)fs->f_flag; 127 ofs.f_syncwrites = CLAMP(fs->f_syncwrites); 128 ofs.f_asyncwrites = CLAMP(fs->f_asyncwrites); 129 (void)strncpy(ofs.f_fstypename, fs->f_fstypename, 130 sizeof(ofs.f_fstypename)); 131 (void)strncpy(ofs.f_mntonname, fs->f_mntonname, 132 sizeof(ofs.f_mntonname)); 133 (void)strncpy(ofs.f_mntfromname, fs->f_mntfromname, 134 sizeof(ofs.f_mntfromname)); 135 136 return copyout(&ofs, bfs, sizeof(ofs)); 137 } 138 139 /* 140 * Get filesystem statistics. 141 */ 142 /* ARGSUSED */ 143 int 144 compat_20_sys_statfs(l, v, retval) 145 struct lwp *l; 146 void *v; 147 register_t *retval; 148 { 149 struct compat_20_sys_statfs_args /* { 150 syscallarg(const char *) path; 151 syscallarg(struct statfs12 *) buf; 152 } */ *uap = v; 153 struct mount *mp; 154 struct statvfs *sbuf; 155 int error = 0; 156 struct nameidata nd; 157 158 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 159 if ((error = namei(&nd)) != 0) 160 return error; 161 162 mp = nd.ni_vp->v_mount; 163 vrele(nd.ni_vp); 164 165 sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK); 166 if ((error = dostatvfs(mp, sbuf, l, 0, 1)) != 0) 167 goto done; 168 169 error = vfs2fs(SCARG(uap, buf), sbuf); 170 done: 171 free(sbuf, M_TEMP); 172 return error; 173 } 174 175 /* 176 * Get filesystem statistics. 177 */ 178 /* ARGSUSED */ 179 int 180 compat_20_sys_fstatfs(l, v, retval) 181 struct lwp *l; 182 void *v; 183 register_t *retval; 184 { 185 struct compat_20_sys_fstatfs_args /* { 186 syscallarg(int) fd; 187 syscallarg(struct statfs12 *) buf; 188 } */ *uap = v; 189 struct proc *p = l->l_proc; 190 struct file *fp; 191 struct mount *mp; 192 struct statvfs sbuf; 193 int error; 194 195 /* getvnode() will use the descriptor for us */ 196 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 197 return (error); 198 mp = ((struct vnode *)fp->f_data)->v_mount; 199 if ((error = dostatvfs(mp, &sbuf, l, 0, 1)) != 0) 200 goto out; 201 error = vfs2fs(SCARG(uap, buf), &sbuf); 202 out: 203 FILE_UNUSE(fp, l); 204 return error; 205 } 206 207 208 /* 209 * Get statistics on all filesystems. 210 */ 211 int 212 compat_20_sys_getfsstat(l, v, retval) 213 struct lwp *l; 214 void *v; 215 register_t *retval; 216 { 217 struct compat_20_sys_getfsstat_args /* { 218 syscallarg(struct statfs12 *) buf; 219 syscallarg(long) bufsize; 220 syscallarg(int) flags; 221 } */ *uap = v; 222 int root = 0; 223 struct mount *mp, *nmp; 224 struct statvfs sbuf; 225 struct statfs12 *sfsp; 226 size_t count, maxcount; 227 int error = 0; 228 229 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 return (error); 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, &sbuf, l, 266 SCARG(uap, flags), 1)) != 0) 267 return error; 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 return error; 277 } 278 279 int 280 compat_20_sys_fhstatfs(l, v, retval) 281 struct lwp *l; 282 void *v; 283 register_t *retval; 284 { 285 struct compat_20_sys_fhstatfs_args /* 286 syscallarg(const fhandle_t *) fhp; 287 syscallarg(struct statfs12 *) buf; 288 } */ *uap = v; 289 struct proc *p = l->l_proc; 290 struct statvfs sbuf; 291 fhandle_t fh; 292 struct mount *mp; 293 struct vnode *vp; 294 int error; 295 296 /* 297 * Must be super user 298 */ 299 if ((error = suser(p->p_ucred, &p->p_acflag))) 300 return (error); 301 302 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) 303 return (error); 304 305 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 306 return (ESTALE); 307 if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) 308 return (error); 309 mp = vp->v_mount; 310 vput(vp); 311 if ((error = VFS_STATVFS(mp, &sbuf, l)) != 0) 312 return (error); 313 return vfs2fs(SCARG(uap, buf), &sbuf); 314 } 315
Indexes created Mon Sep 29 21:09:56 GMT 2025