Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/compat/common/vfs_syscalls_20.c
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1 /* $NetBSD: vfs_syscalls_20.c,v 1.31 2008/06/24 11:18:15 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 1.31 2008/06/24 11:18:15 ad Exp $"); 41 42 #include "opt_compat_netbsd.h" 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/namei.h> 47 #include <sys/filedesc.h> 48 #include <sys/kernel.h> 49 #include <sys/file.h> 50 #include <sys/stat.h> 51 #include <sys/vnode.h> 52 #include <sys/mount.h> 53 #include <sys/proc.h> 54 #include <sys/uio.h> 55 #include <sys/malloc.h> 56 #include <sys/dirent.h> 57 #include <sys/sysctl.h> 58 #include <sys/syscallargs.h> 59 #include <sys/kauth.h> 60 61 #include <compat/sys/mount.h> 62 63 #ifdef COMPAT_09 64 #define MOUNTNO_NONE 0 65 #define MOUNTNO_UFS 1 /* UNIX "Fast" Filesystem */ 66 #define MOUNTNO_NFS 2 /* Network Filesystem */ 67 #define MOUNTNO_MFS 3 /* Memory Filesystem */ 68 #define MOUNTNO_MSDOS 4 /* MSDOS Filesystem */ 69 #define MOUNTNO_CD9660 5 /* iso9660 cdrom */ 70 #define MOUNTNO_FDESC 6 /* /dev/fd filesystem */ 71 #define MOUNTNO_KERNFS 7 /* kernel variable filesystem */ 72 #define MOUNTNO_DEVFS 8 /* device node filesystem */ 73 #define MOUNTNO_AFS 9 /* AFS 3.x */ 74 static const struct { 75 const char *name; 76 const int value; 77 } nv[] = { 78 { MOUNT_UFS, MOUNTNO_UFS }, 79 { MOUNT_NFS, MOUNTNO_NFS }, 80 { MOUNT_MFS, MOUNTNO_MFS }, 81 { MOUNT_MSDOS, MOUNTNO_MSDOS }, 82 { MOUNT_CD9660, MOUNTNO_CD9660 }, 83 { MOUNT_FDESC, MOUNTNO_FDESC }, 84 { MOUNT_KERNFS, MOUNTNO_KERNFS }, 85 { MOUNT_AFS, MOUNTNO_AFS }, 86 }; 87 #endif 88 89 static int 90 vfs2fs(struct statfs12 *bfs, const struct statvfs *fs) 91 { 92 struct statfs12 ofs; 93 #ifdef COMPAT_09 94 int i = 0; 95 ofs.f_type = 0; 96 ofs.f_oflags = (short)fs->f_flag; 97 98 for (i = 0; i < sizeof(nv) / sizeof(nv[0]); i++) { 99 if (strcmp(nv[i].name, fs->f_fstypename) == 0) { 100 ofs.f_type = nv[i].value; 101 break; 102 } 103 } 104 #else 105 ofs.f_type = 0; 106 #endif 107 #define CLAMP(a) (long)(((a) & ~LONG_MAX) ? LONG_MAX : (a)) 108 ofs.f_bsize = CLAMP(fs->f_frsize); 109 ofs.f_iosize = CLAMP(fs->f_iosize); 110 ofs.f_blocks = CLAMP(fs->f_blocks); 111 ofs.f_bfree = CLAMP(fs->f_bfree); 112 if (fs->f_bfree > fs->f_bresvd) 113 ofs.f_bavail = CLAMP(fs->f_bfree - fs->f_bresvd); 114 else 115 ofs.f_bavail = -CLAMP(fs->f_bresvd - fs->f_bfree); 116 ofs.f_files = CLAMP(fs->f_files); 117 ofs.f_ffree = CLAMP(fs->f_ffree); 118 ofs.f_fsid = fs->f_fsidx; 119 ofs.f_owner = fs->f_owner; 120 ofs.f_flags = (long)fs->f_flag; 121 ofs.f_syncwrites = CLAMP(fs->f_syncwrites); 122 ofs.f_asyncwrites = CLAMP(fs->f_asyncwrites); 123 (void)strncpy(ofs.f_fstypename, fs->f_fstypename, 124 sizeof(ofs.f_fstypename)); 125 (void)strncpy(ofs.f_mntonname, fs->f_mntonname, 126 sizeof(ofs.f_mntonname)); 127 (void)strncpy(ofs.f_mntfromname, fs->f_mntfromname, 128 sizeof(ofs.f_mntfromname)); 129 130 return copyout(&ofs, bfs, sizeof(ofs)); 131 } 132 133 /* 134 * Get filesystem statistics. 135 */ 136 /* ARGSUSED */ 137 int 138 compat_20_sys_statfs(struct lwp *l, const struct compat_20_sys_statfs_args *uap, register_t *retval) 139 { 140 /* { 141 syscallarg(const char *) path; 142 syscallarg(struct statfs12 *) buf; 143 } */ 144 struct mount *mp; 145 struct statvfs *sbuf; 146 int error = 0; 147 struct nameidata nd; 148 149 NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, UIO_USERSPACE, 150 SCARG(uap, path)); 151 if ((error = namei(&nd)) != 0) 152 return error; 153 154 mp = nd.ni_vp->v_mount; 155 156 sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK); 157 if ((error = dostatvfs(mp, sbuf, l, 0, 1)) != 0) 158 goto done; 159 160 error = vfs2fs(SCARG(uap, buf), sbuf); 161 done: 162 vrele(nd.ni_vp); 163 free(sbuf, M_TEMP); 164 return error; 165 } 166 167 /* 168 * Get filesystem statistics. 169 */ 170 /* ARGSUSED */ 171 int 172 compat_20_sys_fstatfs(struct lwp *l, const struct compat_20_sys_fstatfs_args *uap, register_t *retval) 173 { 174 /* { 175 syscallarg(int) fd; 176 syscallarg(struct statfs12 *) buf; 177 } */ 178 struct file *fp; 179 struct mount *mp; 180 struct statvfs *sbuf; 181 int error; 182 183 /* fd_getvnode() will use the descriptor for us */ 184 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 185 return (error); 186 mp = ((struct vnode *)fp->f_data)->v_mount; 187 sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK); 188 if ((error = dostatvfs(mp, sbuf, l, 0, 1)) != 0) 189 goto out; 190 error = vfs2fs(SCARG(uap, buf), sbuf); 191 out: 192 fd_putfile(SCARG(uap, fd)); 193 free(sbuf, M_TEMP); 194 return error; 195 } 196 197 198 /* 199 * Get statistics on all filesystems. 200 */ 201 int 202 compat_20_sys_getfsstat(struct lwp *l, const struct compat_20_sys_getfsstat_args *uap, register_t *retval) 203 { 204 /* { 205 syscallarg(struct statfs12 *) buf; 206 syscallarg(long) bufsize; 207 syscallarg(int) flags; 208 } */ 209 int root = 0; 210 struct mount *mp, *nmp; 211 struct statvfs *sbuf; 212 struct statfs12 *sfsp; 213 size_t count, maxcount; 214 int error = 0; 215 216 sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK); 217 maxcount = (size_t)SCARG(uap, bufsize) / sizeof(struct statfs12); 218 sfsp = SCARG(uap, buf); 219 mutex_enter(&mountlist_lock); 220 count = 0; 221 for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist; 222 mp = nmp) { 223 if (vfs_busy(mp, &nmp)) { 224 continue; 225 } 226 if (sfsp && count < maxcount) { 227 error = dostatvfs(mp, sbuf, l, SCARG(uap, flags), 0); 228 if (error) { 229 vfs_unbusy(mp, false, &nmp); 230 continue; 231 } 232 error = vfs2fs(sfsp, sbuf); 233 if (error) { 234 vfs_unbusy(mp, false, NULL); 235 goto out; 236 } 237 sfsp++; 238 root |= strcmp(sbuf->f_mntonname, "/") == 0; 239 } 240 count++; 241 vfs_unbusy(mp, false, &nmp); 242 } 243 mutex_exit(&mountlist_lock); 244 if (root == 0 && l->l_proc->p_cwdi->cwdi_rdir) { 245 /* 246 * fake a root entry 247 */ 248 if ((error = dostatvfs(l->l_proc->p_cwdi->cwdi_rdir->v_mount, 249 sbuf, l, SCARG(uap, flags), 1)) != 0) 250 goto out; 251 if (sfsp) 252 error = vfs2fs(sfsp, sbuf); 253 count++; 254 } 255 if (sfsp && count > maxcount) 256 *retval = maxcount; 257 else 258 *retval = count; 259 out: 260 free(sbuf, M_TEMP); 261 return error; 262 } 263 264 int 265 compat_20_sys_fhstatfs(struct lwp *l, const struct compat_20_sys_fhstatfs_args *uap, register_t *retval) 266 { 267 /* { 268 syscallarg(const struct compat_30_fhandle *) fhp; 269 syscallarg(struct statfs12 *) buf; 270 } */ 271 struct statvfs *sbuf; 272 struct compat_30_fhandle fh; 273 struct mount *mp; 274 struct vnode *vp; 275 int error; 276 277 /* 278 * Must be super user 279 */ 280 if ((error = kauth_authorize_system(l->l_cred, 281 KAUTH_SYSTEM_FILEHANDLE, 0, NULL, NULL, NULL))) 282 return (error); 283 284 if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fh))) != 0) 285 return (error); 286 287 if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) 288 return (ESTALE); 289 if ((error = VFS_FHTOVP(mp, (struct fid*)&fh.fh_fid, &vp))) 290 return (error); 291 mp = vp->v_mount; 292 VOP_UNLOCK(vp, 0); 293 sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK); 294 if ((error = VFS_STATVFS(mp, sbuf)) != 0) 295 goto out; 296 error = vfs2fs(SCARG(uap, buf), sbuf); 297 out: 298 vrele(vp); 299 free(sbuf, M_TEMP); 300 return error; 301 }
Cache object: 25aba3becd6d9fe748b5170006e7deae
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