ptyfs_vfsops.c revision 1.10
1 /* $NetBSD: ptyfs_vfsops.c,v 1.10 2005/09/29 14:45:56 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software donated to Berkeley by 8 * Jan-Simon Pendry. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 */ 35 36 /* 37 * Pseudo-tty Filesystem 38 */ 39 40 #include <sys/cdefs.h> 41 __KERNEL_RCSID(0, "$NetBSD: ptyfs_vfsops.c,v 1.10 2005/09/29 14:45:56 christos Exp $"); 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/sysctl.h> 46 #include <sys/conf.h> 47 #include <sys/proc.h> 48 #include <sys/vnode.h> 49 #include <sys/mount.h> 50 #include <sys/namei.h> 51 #include <sys/stat.h> 52 #include <sys/dirent.h> 53 #include <sys/malloc.h> 54 #include <sys/syslog.h> 55 #include <sys/select.h> 56 #include <sys/tty.h> 57 #include <sys/pty.h> 58 59 #include <fs/ptyfs/ptyfs.h> 60 #include <miscfs/specfs/specdev.h> 61 62 MALLOC_DEFINE(M_PTYFSMNT, "ptyfs mount", "ptyfs mount structures"); 63 64 void ptyfs_init(void); 65 void ptyfs_reinit(void); 66 void ptyfs_done(void); 67 int ptyfs_mount(struct mount *, const char *, void *, struct nameidata *, 68 struct proc *); 69 int ptyfs_start(struct mount *, int, struct proc *); 70 int ptyfs_unmount(struct mount *, int, struct proc *); 71 int ptyfs_statvfs(struct mount *, struct statvfs *, struct proc *); 72 int ptyfs_quotactl(struct mount *, int, uid_t, void *, struct proc *); 73 int ptyfs_sync(struct mount *, int, struct ucred *, struct proc *); 74 int ptyfs_vget(struct mount *, ino_t, struct vnode **); 75 76 static int ptyfs__allocvp(struct ptm_pty *, struct proc *, struct vnode **, 77 dev_t, char); 78 static int ptyfs__makename(struct ptm_pty *, char *, size_t, dev_t, char); 79 static void ptyfs__getvattr(struct ptm_pty *, struct proc *, struct vattr *); 80 81 /* 82 * ptm glue: When we mount, we make ptm point to us. 83 */ 84 struct ptm_pty *ptyfs_save_ptm; 85 86 struct ptm_pty ptm_ptyfspty = { 87 ptyfs__allocvp, 88 ptyfs__makename, 89 ptyfs__getvattr, 90 NULL 91 }; 92 93 static int 94 ptyfs__makename(struct ptm_pty *pt, char *tbuf, size_t bufsiz, dev_t dev, 95 char ms) 96 { 97 struct mount *mp = pt->arg; 98 size_t len; 99 100 switch (ms) { 101 case 'p': 102 /* We don't provide access to the master, should we? */ 103 len = snprintf(tbuf, bufsiz, "/dev/null"); 104 break; 105 case 't': 106 len = snprintf(tbuf, bufsiz, "%s/%d", mp->mnt_stat.f_mntonname, 107 minor(dev)); 108 break; 109 default: 110 return EINVAL; 111 } 112 113 return len >= bufsiz ? ENOSPC : 0; 114 } 115 116 117 static int 118 /*ARGSUSED*/ 119 ptyfs__allocvp(struct ptm_pty *pt, struct proc *p, struct vnode **vpp, 120 dev_t dev, char ms) 121 { 122 struct mount *mp = pt->arg; 123 ptyfstype type; 124 125 switch (ms) { 126 case 'p': 127 type = PTYFSptc; 128 break; 129 case 't': 130 type = PTYFSpts; 131 break; 132 default: 133 return EINVAL; 134 } 135 136 return ptyfs_allocvp(mp, vpp, type, minor(dev), p); 137 } 138 139 140 static void 141 ptyfs__getvattr(struct ptm_pty *pt, struct proc *p, struct vattr *vattr) 142 { 143 struct mount *mp = pt->arg; 144 struct ptyfsmount *pmnt = VFSTOPTY(mp); 145 VATTR_NULL(vattr); 146 /* get real uid */ 147 vattr->va_uid = p->p_cred->p_ruid; 148 vattr->va_gid = pmnt->pmnt_gid; 149 vattr->va_mode = pmnt->pmnt_mode; 150 } 151 152 153 void 154 ptyfs_init(void) 155 { 156 #ifdef _LKM 157 malloc_type_attach(M_PTYFSMNT); 158 #endif 159 ptyfs_hashinit(); 160 } 161 162 void 163 ptyfs_reinit(void) 164 { 165 ptyfs_hashreinit(); 166 } 167 168 void 169 ptyfs_done(void) 170 { 171 #ifdef _LKM 172 malloc_type_detach(M_PTYFSMNT); 173 #endif 174 ptyfs_hashdone(); 175 } 176 177 /* 178 * Mount the Pseudo tty params filesystem 179 */ 180 int 181 ptyfs_mount(struct mount *mp, const char *path, void *data, 182 struct nameidata *ndp, struct proc *p) 183 { 184 int error = 0; 185 struct ptyfsmount *pmnt; 186 struct ptyfs_args args; 187 188 /* Don't allow more than one mount */ 189 if (ptyfs_save_ptm != NULL) 190 return EBUSY; 191 192 if (UIO_MX & (UIO_MX - 1)) { 193 log(LOG_ERR, "ptyfs: invalid directory entry size"); 194 return EINVAL; 195 } 196 197 if (mp->mnt_flag & MNT_GETARGS) { 198 pmnt = VFSTOPTY(mp); 199 if (pmnt == NULL) 200 return EIO; 201 args.version = PTYFS_ARGSVERSION; 202 args.mode = pmnt->pmnt_mode; 203 args.gid = pmnt->pmnt_gid; 204 return copyout(&args, data, sizeof(args)); 205 } 206 207 if (mp->mnt_flag & MNT_UPDATE) 208 return EOPNOTSUPP; 209 210 if (data != NULL) { 211 error = copyin(data, &args, sizeof args); 212 if (error != 0) 213 return error; 214 215 if (args.version != PTYFS_ARGSVERSION) 216 return EINVAL; 217 } else { 218 /* 219 * Arguments are mandatory. 220 */ 221 return EINVAL; 222 } 223 224 pmnt = malloc(sizeof(struct ptyfsmount), M_UFSMNT, M_WAITOK); 225 226 mp->mnt_data = pmnt; 227 pmnt->pmnt_gid = args.gid; 228 pmnt->pmnt_mode = args.mode; 229 mp->mnt_flag |= MNT_LOCAL; 230 vfs_getnewfsid(mp); 231 232 if ((error = set_statvfs_info(path, UIO_USERSPACE, "ptyfs", 233 UIO_SYSSPACE, mp, p)) != 0) { 234 free(pmnt, M_UFSMNT); 235 return error; 236 } 237 238 /* Point pty access to us */ 239 240 ptm_ptyfspty.arg = mp; 241 ptyfs_save_ptm = pty_sethandler(&ptm_ptyfspty); 242 return 0; 243 } 244 245 /*ARGSUSED*/ 246 int 247 ptyfs_start(struct mount *mp, int flags, struct proc *p) 248 { 249 return 0; 250 } 251 252 /*ARGSUSED*/ 253 int 254 ptyfs_unmount(struct mount *mp, int mntflags, struct proc *p) 255 { 256 int error; 257 int flags = 0; 258 259 if (mntflags & MNT_FORCE) 260 flags |= FORCECLOSE; 261 262 if ((error = vflush(mp, 0, flags)) != 0) 263 return (error); 264 265 /* Restore where pty access was pointing */ 266 KASSERT(ptyfs_save_ptm != NULL); 267 (void)pty_sethandler(ptyfs_save_ptm); 268 ptyfs_save_ptm = NULL; 269 ptm_ptyfspty.arg = NULL; 270 271 /* 272 * Finally, throw away the ptyfsmount structure 273 */ 274 free(mp->mnt_data, M_UFSMNT); 275 mp->mnt_data = 0; 276 277 return 0; 278 } 279 280 int 281 ptyfs_root(struct mount *mp, struct vnode **vpp) 282 { 283 /* setup "." */ 284 return ptyfs_allocvp(mp, vpp, PTYFSroot, 0, NULL); 285 } 286 287 /*ARGSUSED*/ 288 int 289 ptyfs_quotactl(struct mount *mp, int cmd, uid_t uid, void *arg, struct proc *p) 290 { 291 return EOPNOTSUPP; 292 } 293 294 /*ARGSUSED*/ 295 int 296 ptyfs_statvfs(struct mount *mp, struct statvfs *sbp, struct proc *p) 297 { 298 sbp->f_bsize = DEV_BSIZE; 299 sbp->f_frsize = DEV_BSIZE; 300 sbp->f_iosize = DEV_BSIZE; 301 sbp->f_blocks = 2; /* 1K to keep df happy */ 302 sbp->f_bfree = 0; 303 sbp->f_bavail = 0; 304 sbp->f_bresvd = 0; 305 sbp->f_files = 1024; /* XXX lie */ 306 sbp->f_ffree = 128; /* XXX lie */ 307 sbp->f_favail = 128; /* XXX lie */ 308 sbp->f_fresvd = 0; 309 sbp->f_namemax = MAXNAMLEN; 310 copy_statvfs_info(sbp, mp); 311 return 0; 312 } 313 314 /*ARGSUSED*/ 315 int 316 ptyfs_sync(struct mount *mp, int waitfor, struct ucred *uc, struct proc *p) 317 { 318 return 0; 319 } 320 321 /* 322 * Kernfs flat namespace lookup. 323 * Currently unsupported. 324 */ 325 /*ARGSUSED*/ 326 int 327 ptyfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 328 { 329 return EOPNOTSUPP; 330 } 331 332 SYSCTL_SETUP(sysctl_vfs_ptyfs_setup, "sysctl vfs.ptyfs subtree setup") 333 { 334 335 sysctl_createv(clog, 0, NULL, NULL, 336 CTLFLAG_PERMANENT, 337 CTLTYPE_NODE, "vfs", NULL, 338 NULL, 0, NULL, 0, 339 CTL_VFS, CTL_EOL); 340 sysctl_createv(clog, 0, NULL, NULL, 341 CTLFLAG_PERMANENT, 342 CTLTYPE_NODE, "ptyfs", 343 SYSCTL_DESCR("Pty file system"), 344 NULL, 0, NULL, 0, 345 CTL_VFS, 23, CTL_EOL); 346 /* 347 * XXX the "23" above could be dynamic, thereby eliminating 348 * one more instance of the "number to vfs" mapping problem, 349 * but "23" is the order as taken from sys/mount.h 350 */ 351 } 352 353 354 extern const struct vnodeopv_desc ptyfs_vnodeop_opv_desc; 355 356 const struct vnodeopv_desc * const ptyfs_vnodeopv_descs[] = { 357 &ptyfs_vnodeop_opv_desc, 358 NULL, 359 }; 360 361 struct vfsops ptyfs_vfsops = { 362 MOUNT_PTYFS, 363 ptyfs_mount, 364 ptyfs_start, 365 ptyfs_unmount, 366 ptyfs_root, 367 ptyfs_quotactl, 368 ptyfs_statvfs, 369 ptyfs_sync, 370 ptyfs_vget, 371 NULL, /* vfs_fhtovp */ 372 NULL, /* vfs_vptofp */ 373 ptyfs_init, 374 ptyfs_reinit, 375 ptyfs_done, 376 NULL, /* vfs_mountroot */ 377 (int (*)(struct mount *, struct vnode *, struct timespec *))eopnotsupp, 378 (int (*)(struct mount *, int, struct vnode *, int, const char *, 379 struct proc *))eopnotsupp, 380 ptyfs_vnodeopv_descs, 381 }; 382 VFS_ATTACH(ptyfs_vfsops); 383
Indexes created Wed Sep 24 05:09:52 GMT 2025