| 1 | /* |
| 2 | * Copyright (c) 1982, 1986, 1989 Regents of the University of California. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * %sccs.include.redist.c% |
| 6 | * |
| 7 | * @(#)ufs_vnops.c 7.103 (Berkeley) %G% |
| 8 | */ |
| 9 | |
| 10 | #include <sys/param.h> |
| 11 | #include <sys/systm.h> |
| 12 | #include <sys/namei.h> |
| 13 | #include <sys/resourcevar.h> |
| 14 | #include <sys/kernel.h> |
| 15 | #include <sys/file.h> |
| 16 | #include <sys/stat.h> |
| 17 | #include <sys/buf.h> |
| 18 | #include <sys/proc.h> |
| 19 | #include <sys/conf.h> |
| 20 | #include <sys/mount.h> |
| 21 | #include <sys/vnode.h> |
| 22 | #include <sys/malloc.h> |
| 23 | #include <sys/dirent.h> |
| 24 | |
| 25 | #include <vm/vm.h> |
| 26 | |
| 27 | #include <miscfs/specfs/specdev.h> |
| 28 | |
| 29 | #include <ufs/ufs/lockf.h> |
| 30 | #include <ufs/ufs/quota.h> |
| 31 | #include <ufs/ufs/inode.h> |
| 32 | #include <ufs/ufs/dir.h> |
| 33 | #include <ufs/ufs/ufsmount.h> |
| 34 | #include <ufs/ufs/ufs_extern.h> |
| 35 | |
| 36 | static int ufs_chmod __P((struct vnode *, int, struct ucred *, struct proc *)); |
| 37 | static int ufs_chown |
| 38 | __P((struct vnode *, uid_t, gid_t, struct ucred *, struct proc *)); |
| 39 | |
| 40 | union _qcvt { |
| 41 | quad_t qcvt; |
| 42 | long val[2]; |
| 43 | }; |
| 44 | #define SETHIGH(q, h) { \ |
| 45 | union _qcvt tmp; \ |
| 46 | tmp.qcvt = (q); \ |
| 47 | tmp.val[_QUAD_HIGHWORD] = (h); \ |
| 48 | (q) = tmp.qcvt; \ |
| 49 | } |
| 50 | #define SETLOW(q, l) { \ |
| 51 | union _qcvt tmp; \ |
| 52 | tmp.qcvt = (q); \ |
| 53 | tmp.val[_QUAD_LOWWORD] = (l); \ |
| 54 | (q) = tmp.qcvt; \ |
| 55 | } |
| 56 | |
| 57 | /* |
| 58 | * Create a regular file |
| 59 | */ |
| 60 | int |
| 61 | ufs_create(ap) |
| 62 | struct vop_create_args /* { |
| 63 | struct vnode *a_dvp; |
| 64 | struct vnode **a_vpp; |
| 65 | struct componentname *a_cnp; |
| 66 | struct vattr *a_vap; |
| 67 | } */ *ap; |
| 68 | { |
| 69 | int error; |
| 70 | |
| 71 | if (error = |
| 72 | ufs_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode), |
| 73 | ap->a_dvp, ap->a_vpp, ap->a_cnp)) |
| 74 | return (error); |
| 75 | return (0); |
| 76 | } |
| 77 | |
| 78 | /* |
| 79 | * Mknod vnode call |
| 80 | */ |
| 81 | /* ARGSUSED */ |
| 82 | int |
| 83 | ufs_mknod(ap) |
| 84 | struct vop_mknod_args /* { |
| 85 | struct vnode *a_dvp; |
| 86 | struct vnode **a_vpp; |
| 87 | struct componentname *a_cnp; |
| 88 | struct vattr *a_vap; |
| 89 | } */ *ap; |
| 90 | { |
| 91 | register struct vattr *vap = ap->a_vap; |
| 92 | register struct vnode **vpp = ap->a_vpp; |
| 93 | register struct inode *ip; |
| 94 | int error; |
| 95 | |
| 96 | if (error = |
| 97 | ufs_makeinode(MAKEIMODE(vap->va_type, vap->va_mode), |
| 98 | ap->a_dvp, vpp, ap->a_cnp)) |
| 99 | return (error); |
| 100 | ip = VTOI(*vpp); |
| 101 | ip->i_flag |= IACC|IUPD|ICHG; |
| 102 | if (vap->va_rdev != VNOVAL) { |
| 103 | /* |
| 104 | * Want to be able to use this to make badblock |
| 105 | * inodes, so don't truncate the dev number. |
| 106 | */ |
| 107 | ip->i_rdev = vap->va_rdev; |
| 108 | } |
| 109 | /* |
| 110 | * Remove inode so that it will be reloaded by iget and |
| 111 | * checked to see if it is an alias of an existing entry |
| 112 | * in the inode cache. |
| 113 | */ |
| 114 | vput(*vpp); |
| 115 | (*vpp)->v_type = VNON; |
| 116 | vgone(*vpp); |
| 117 | *vpp = 0; |
| 118 | return (0); |
| 119 | } |
| 120 | |
| 121 | /* |
| 122 | * Open called. |
| 123 | * |
| 124 | * Nothing to do. |
| 125 | */ |
| 126 | /* ARGSUSED */ |
| 127 | int |
| 128 | ufs_open(ap) |
| 129 | struct vop_open_args /* { |
| 130 | struct vnode *a_vp; |
| 131 | int a_mode; |
| 132 | struct ucred *a_cred; |
| 133 | struct proc *a_p; |
| 134 | } */ *ap; |
| 135 | { |
| 136 | |
| 137 | return (0); |
| 138 | } |
| 139 | |
| 140 | /* |
| 141 | * Close called |
| 142 | * |
| 143 | * Update the times on the inode. |
| 144 | */ |
| 145 | /* ARGSUSED */ |
| 146 | int |
| 147 | ufs_close(ap) |
| 148 | struct vop_close_args /* { |
| 149 | struct vnode *a_vp; |
| 150 | int a_fflag; |
| 151 | struct ucred *a_cred; |
| 152 | struct proc *a_p; |
| 153 | } */ *ap; |
| 154 | { |
| 155 | register struct vnode *vp = ap->a_vp; |
| 156 | register struct inode *ip = VTOI(vp); |
| 157 | |
| 158 | if (vp->v_usecount > 1 && !(ip->i_flag & ILOCKED)) |
| 159 | ITIMES(ip, &time, &time); |
| 160 | return (0); |
| 161 | } |
| 162 | |
| 163 | /* |
| 164 | * Check mode permission on inode pointer. Mode is READ, WRITE or EXEC. |
| 165 | * The mode is shifted to select the owner/group/other fields. The |
| 166 | * super user is granted all permissions. |
| 167 | */ |
| 168 | int |
| 169 | ufs_access(ap) |
| 170 | struct vop_access_args /* { |
| 171 | struct vnode *a_vp; |
| 172 | int a_mode; |
| 173 | struct ucred *a_cred; |
| 174 | struct proc *a_p; |
| 175 | } */ *ap; |
| 176 | { |
| 177 | register struct vnode *vp = ap->a_vp; |
| 178 | register struct inode *ip = VTOI(vp); |
| 179 | register struct ucred *cred = ap->a_cred; |
| 180 | mode_t mode = ap->a_mode; |
| 181 | register gid_t *gp; |
| 182 | int i, error; |
| 183 | |
| 184 | #ifdef DIAGNOSTIC |
| 185 | if (!VOP_ISLOCKED(vp)) { |
| 186 | vprint("ufs_access: not locked", vp); |
| 187 | panic("ufs_access: not locked"); |
| 188 | } |
| 189 | #endif |
| 190 | #ifdef QUOTA |
| 191 | if (mode & VWRITE) { |
| 192 | switch (vp->v_type) { |
| 193 | case VREG: case VDIR: case VLNK: |
| 194 | if (error = getinoquota(ip)) |
| 195 | return (error); |
| 196 | } |
| 197 | } |
| 198 | #endif /* QUOTA */ |
| 199 | /* |
| 200 | * If you're the super-user, you always get access. |
| 201 | */ |
| 202 | if (cred->cr_uid == 0) |
| 203 | return (0); |
| 204 | /* |
| 205 | * Access check is based on only one of owner, group, public. |
| 206 | * If not owner, then check group. If not a member of the |
| 207 | * group, then check public access. |
| 208 | */ |
| 209 | if (cred->cr_uid != ip->i_uid) { |
| 210 | mode >>= 3; |
| 211 | gp = cred->cr_groups; |
| 212 | for (i = 0; i < cred->cr_ngroups; i++, gp++) |
| 213 | if (ip->i_gid == *gp) |
| 214 | goto found; |
| 215 | mode >>= 3; |
| 216 | found: |
| 217 | ; |
| 218 | } |
| 219 | if ((ip->i_mode & mode) != 0) |
| 220 | return (0); |
| 221 | return (EACCES); |
| 222 | } |
| 223 | |
| 224 | /* ARGSUSED */ |
| 225 | int |
| 226 | ufs_getattr(ap) |
| 227 | struct vop_getattr_args /* { |
| 228 | struct vnode *a_vp; |
| 229 | struct vattr *a_vap; |
| 230 | struct ucred *a_cred; |
| 231 | struct proc *a_p; |
| 232 | } */ *ap; |
| 233 | { |
| 234 | register struct vnode *vp = ap->a_vp; |
| 235 | register struct inode *ip = VTOI(vp); |
| 236 | register struct vattr *vap = ap->a_vap; |
| 237 | |
| 238 | ITIMES(ip, &time, &time); |
| 239 | /* |
| 240 | * Copy from inode table |
| 241 | */ |
| 242 | vap->va_fsid = ip->i_dev; |
| 243 | vap->va_fileid = ip->i_number; |
| 244 | vap->va_mode = ip->i_mode & ~IFMT; |
| 245 | vap->va_nlink = ip->i_nlink; |
| 246 | vap->va_uid = ip->i_uid; |
| 247 | vap->va_gid = ip->i_gid; |
| 248 | vap->va_rdev = (dev_t)ip->i_rdev; |
| 249 | vap->va_size = ip->i_din.di_size; |
| 250 | vap->va_atime = ip->i_atime; |
| 251 | vap->va_mtime = ip->i_mtime; |
| 252 | vap->va_ctime = ip->i_ctime; |
| 253 | vap->va_flags = ip->i_flags; |
| 254 | vap->va_gen = ip->i_gen; |
| 255 | /* this doesn't belong here */ |
| 256 | if (vp->v_type == VBLK) |
| 257 | vap->va_blocksize = BLKDEV_IOSIZE; |
| 258 | else if (vp->v_type == VCHR) |
| 259 | vap->va_blocksize = MAXBSIZE; |
| 260 | else |
| 261 | vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize; |
| 262 | vap->va_bytes = dbtob(ip->i_blocks); |
| 263 | vap->va_type = vp->v_type; |
| 264 | vap->va_filerev = ip->i_modrev; |
| 265 | return (0); |
| 266 | } |
| 267 | |
| 268 | /* |
| 269 | * Set attribute vnode op. called from several syscalls |
| 270 | */ |
| 271 | int |
| 272 | ufs_setattr(ap) |
| 273 | struct vop_setattr_args /* { |
| 274 | struct vnode *a_vp; |
| 275 | struct vattr *a_vap; |
| 276 | struct ucred *a_cred; |
| 277 | struct proc *a_p; |
| 278 | } */ *ap; |
| 279 | { |
| 280 | register struct vattr *vap = ap->a_vap; |
| 281 | register struct vnode *vp = ap->a_vp; |
| 282 | register struct inode *ip = VTOI(vp); |
| 283 | register struct ucred *cred = ap->a_cred; |
| 284 | register struct proc *p = ap->a_p; |
| 285 | struct timeval atimeval, mtimeval; |
| 286 | int error; |
| 287 | |
| 288 | /* |
| 289 | * Check for unsettable attributes. |
| 290 | */ |
| 291 | if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || |
| 292 | (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || |
| 293 | (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || |
| 294 | ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { |
| 295 | return (EINVAL); |
| 296 | } |
| 297 | /* |
| 298 | * Go through the fields and update iff not VNOVAL. |
| 299 | */ |
| 300 | if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) |
| 301 | if (error = ufs_chown(vp, vap->va_uid, vap->va_gid, cred, p)) |
| 302 | return (error); |
| 303 | if (vap->va_size != VNOVAL) { |
| 304 | if (vp->v_type == VDIR) |
| 305 | return (EISDIR); |
| 306 | if (error = VOP_TRUNCATE(vp, vap->va_size, 0, cred, p)) |
| 307 | return (error); |
| 308 | } |
| 309 | ip = VTOI(vp); |
| 310 | if (vap->va_atime.ts_sec != VNOVAL || vap->va_mtime.ts_sec != VNOVAL) { |
| 311 | if (cred->cr_uid != ip->i_uid && |
| 312 | (error = suser(cred, &p->p_acflag))) |
| 313 | return (error); |
| 314 | if (vap->va_atime.ts_sec != VNOVAL) |
| 315 | ip->i_flag |= IACC; |
| 316 | if (vap->va_mtime.ts_sec != VNOVAL) |
| 317 | ip->i_flag |= IUPD; |
| 318 | ip->i_flag |= ICHG; |
| 319 | atimeval.tv_sec = vap->va_atime.ts_sec; |
| 320 | atimeval.tv_usec = vap->va_atime.ts_nsec / 1000; |
| 321 | mtimeval.tv_sec = vap->va_mtime.ts_sec; |
| 322 | mtimeval.tv_usec = vap->va_mtime.ts_nsec / 1000; |
| 323 | if (error = VOP_UPDATE(vp, &atimeval, &mtimeval, 1)) |
| 324 | return (error); |
| 325 | } |
| 326 | error = 0; |
| 327 | if (vap->va_mode != (mode_t)VNOVAL) |
| 328 | error = ufs_chmod(vp, (int)vap->va_mode, cred, p); |
| 329 | if (vap->va_flags != VNOVAL) { |
| 330 | if (cred->cr_uid != ip->i_uid && |
| 331 | (error = suser(cred, &p->p_acflag))) |
| 332 | return (error); |
| 333 | if (cred->cr_uid == 0) { |
| 334 | ip->i_flags = vap->va_flags; |
| 335 | } else { |
| 336 | ip->i_flags &= 0xffff0000; |
| 337 | ip->i_flags |= (vap->va_flags & 0xffff); |
| 338 | } |
| 339 | ip->i_flag |= ICHG; |
| 340 | } |
| 341 | return (error); |
| 342 | } |
| 343 | |
| 344 | /* |
| 345 | * Change the mode on a file. |
| 346 | * Inode must be locked before calling. |
| 347 | */ |
| 348 | static int |
| 349 | ufs_chmod(vp, mode, cred, p) |
| 350 | register struct vnode *vp; |
| 351 | register int mode; |
| 352 | register struct ucred *cred; |
| 353 | struct proc *p; |
| 354 | { |
| 355 | register struct inode *ip = VTOI(vp); |
| 356 | int error; |
| 357 | |
| 358 | if (cred->cr_uid != ip->i_uid && |
| 359 | (error = suser(cred, &p->p_acflag))) |
| 360 | return (error); |
| 361 | if (cred->cr_uid) { |
| 362 | if (vp->v_type != VDIR && (mode & ISVTX)) |
| 363 | return (EFTYPE); |
| 364 | if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) |
| 365 | return (EPERM); |
| 366 | } |
| 367 | ip->i_mode &= ~07777; |
| 368 | ip->i_mode |= mode & 07777; |
| 369 | ip->i_flag |= ICHG; |
| 370 | if ((vp->v_flag & VTEXT) && (ip->i_mode & ISVTX) == 0) |
| 371 | (void) vnode_pager_uncache(vp); |
| 372 | return (0); |
| 373 | } |
| 374 | |
| 375 | /* |
| 376 | * Perform chown operation on inode ip; |
| 377 | * inode must be locked prior to call. |
| 378 | */ |
| 379 | static int |
| 380 | ufs_chown(vp, uid, gid, cred, p) |
| 381 | register struct vnode *vp; |
| 382 | uid_t uid; |
| 383 | gid_t gid; |
| 384 | struct ucred *cred; |
| 385 | struct proc *p; |
| 386 | { |
| 387 | register struct inode *ip = VTOI(vp); |
| 388 | uid_t ouid; |
| 389 | gid_t ogid; |
| 390 | int error = 0; |
| 391 | #ifdef QUOTA |
| 392 | register int i; |
| 393 | long change; |
| 394 | #endif |
| 395 | |
| 396 | if (uid == (uid_t)VNOVAL) |
| 397 | uid = ip->i_uid; |
| 398 | if (gid == (gid_t)VNOVAL) |
| 399 | gid = ip->i_gid; |
| 400 | /* |
| 401 | * If we don't own the file, are trying to change the owner |
| 402 | * of the file, or are not a member of the target group, |
| 403 | * the caller must be superuser or the call fails. |
| 404 | */ |
| 405 | if ((cred->cr_uid != ip->i_uid || uid != ip->i_uid || |
| 406 | !groupmember((gid_t)gid, cred)) && |
| 407 | (error = suser(cred, &p->p_acflag))) |
| 408 | return (error); |
| 409 | ouid = ip->i_uid; |
| 410 | ogid = ip->i_gid; |
| 411 | #ifdef QUOTA |
| 412 | if (error = getinoquota(ip)) |
| 413 | return (error); |
| 414 | if (ouid == uid) { |
| 415 | dqrele(vp, ip->i_dquot[USRQUOTA]); |
| 416 | ip->i_dquot[USRQUOTA] = NODQUOT; |
| 417 | } |
| 418 | if (ogid == gid) { |
| 419 | dqrele(vp, ip->i_dquot[GRPQUOTA]); |
| 420 | ip->i_dquot[GRPQUOTA] = NODQUOT; |
| 421 | } |
| 422 | change = ip->i_blocks; |
| 423 | (void) chkdq(ip, -change, cred, CHOWN); |
| 424 | (void) chkiq(ip, -1, cred, CHOWN); |
| 425 | for (i = 0; i < MAXQUOTAS; i++) { |
| 426 | dqrele(vp, ip->i_dquot[i]); |
| 427 | ip->i_dquot[i] = NODQUOT; |
| 428 | } |
| 429 | #endif |
| 430 | ip->i_uid = uid; |
| 431 | ip->i_gid = gid; |
| 432 | #ifdef QUOTA |
| 433 | if ((error = getinoquota(ip)) == 0) { |
| 434 | if (ouid == uid) { |
| 435 | dqrele(vp, ip->i_dquot[USRQUOTA]); |
| 436 | ip->i_dquot[USRQUOTA] = NODQUOT; |
| 437 | } |
| 438 | if (ogid == gid) { |
| 439 | dqrele(vp, ip->i_dquot[GRPQUOTA]); |
| 440 | ip->i_dquot[GRPQUOTA] = NODQUOT; |
| 441 | } |
| 442 | if ((error = chkdq(ip, change, cred, CHOWN)) == 0) { |
| 443 | if ((error = chkiq(ip, 1, cred, CHOWN)) == 0) |
| 444 | goto good; |
| 445 | else |
| 446 | (void) chkdq(ip, -change, cred, CHOWN|FORCE); |
| 447 | } |
| 448 | for (i = 0; i < MAXQUOTAS; i++) { |
| 449 | dqrele(vp, ip->i_dquot[i]); |
| 450 | ip->i_dquot[i] = NODQUOT; |
| 451 | } |
| 452 | } |
| 453 | ip->i_uid = ouid; |
| 454 | ip->i_gid = ogid; |
| 455 | if (getinoquota(ip) == 0) { |
| 456 | if (ouid == uid) { |
| 457 | dqrele(vp, ip->i_dquot[USRQUOTA]); |
| 458 | ip->i_dquot[USRQUOTA] = NODQUOT; |
| 459 | } |
| 460 | if (ogid == gid) { |
| 461 | dqrele(vp, ip->i_dquot[GRPQUOTA]); |
| 462 | ip->i_dquot[GRPQUOTA] = NODQUOT; |
| 463 | } |
| 464 | (void) chkdq(ip, change, cred, FORCE|CHOWN); |
| 465 | (void) chkiq(ip, 1, cred, FORCE|CHOWN); |
| 466 | (void) getinoquota(ip); |
| 467 | } |
| 468 | return (error); |
| 469 | good: |
| 470 | if (getinoquota(ip)) |
| 471 | panic("chown: lost quota"); |
| 472 | #endif /* QUOTA */ |
| 473 | if (ouid != uid || ogid != gid) |
| 474 | ip->i_flag |= ICHG; |
| 475 | if (ouid != uid && cred->cr_uid != 0) |
| 476 | ip->i_mode &= ~ISUID; |
| 477 | if (ogid != gid && cred->cr_uid != 0) |
| 478 | ip->i_mode &= ~ISGID; |
| 479 | return (0); |
| 480 | } |
| 481 | |
| 482 | /* ARGSUSED */ |
| 483 | int |
| 484 | ufs_ioctl(ap) |
| 485 | struct vop_ioctl_args /* { |
| 486 | struct vnode *a_vp; |
| 487 | int a_command; |
| 488 | caddr_t a_data; |
| 489 | int a_fflag; |
| 490 | struct ucred *a_cred; |
| 491 | struct proc *a_p; |
| 492 | } */ *ap; |
| 493 | { |
| 494 | |
| 495 | return (ENOTTY); |
| 496 | } |
| 497 | |
| 498 | /* ARGSUSED */ |
| 499 | int |
| 500 | ufs_select(ap) |
| 501 | struct vop_select_args /* { |
| 502 | struct vnode *a_vp; |
| 503 | int a_which; |
| 504 | int a_fflags; |
| 505 | struct ucred *a_cred; |
| 506 | struct proc *a_p; |
| 507 | } */ *ap; |
| 508 | { |
| 509 | |
| 510 | /* |
| 511 | * We should really check to see if I/O is possible. |
| 512 | */ |
| 513 | return (1); |
| 514 | } |
| 515 | |
| 516 | /* |
| 517 | * Mmap a file |
| 518 | * |
| 519 | * NB Currently unsupported. |
| 520 | */ |
| 521 | /* ARGSUSED */ |
| 522 | int |
| 523 | ufs_mmap(ap) |
| 524 | struct vop_mmap_args /* { |
| 525 | struct vnode *a_vp; |
| 526 | int a_fflags; |
| 527 | struct ucred *a_cred; |
| 528 | struct proc *a_p; |
| 529 | } */ *ap; |
| 530 | { |
| 531 | |
| 532 | return (EINVAL); |
| 533 | } |
| 534 | |
| 535 | /* |
| 536 | * Seek on a file |
| 537 | * |
| 538 | * Nothing to do, so just return. |
| 539 | */ |
| 540 | /* ARGSUSED */ |
| 541 | int |
| 542 | ufs_seek(ap) |
| 543 | struct vop_seek_args /* { |
| 544 | struct vnode *a_vp; |
| 545 | off_t a_oldoff; |
| 546 | off_t a_newoff; |
| 547 | struct ucred *a_cred; |
| 548 | } */ *ap; |
| 549 | { |
| 550 | |
| 551 | return (0); |
| 552 | } |
| 553 | |
| 554 | /* |
| 555 | * ufs remove |
| 556 | * Hard to avoid races here, especially |
| 557 | * in unlinking directories. |
| 558 | */ |
| 559 | int |
| 560 | ufs_remove(ap) |
| 561 | struct vop_remove_args /* { |
| 562 | struct vnode *a_dvp; |
| 563 | struct vnode *a_vp; |
| 564 | struct componentname *a_cnp; |
| 565 | } */ *ap; |
| 566 | { |
| 567 | register struct inode *ip, *dp; |
| 568 | int error; |
| 569 | |
| 570 | ip = VTOI(ap->a_vp); |
| 571 | dp = VTOI(ap->a_dvp); |
| 572 | error = ufs_dirremove(ap->a_dvp, ap->a_cnp); |
| 573 | if (!error) { |
| 574 | ip->i_nlink--; |
| 575 | ip->i_flag |= ICHG; |
| 576 | } |
| 577 | if (dp == ip) |
| 578 | vrele(ITOV(ip)); |
| 579 | else |
| 580 | ufs_iput(ip); |
| 581 | ufs_iput(dp); |
| 582 | return (error); |
| 583 | } |
| 584 | |
| 585 | /* |
| 586 | * link vnode call |
| 587 | */ |
| 588 | int |
| 589 | ufs_link(ap) |
| 590 | struct vop_link_args /* { |
| 591 | struct vnode *a_vp; |
| 592 | struct vnode *a_tdvp; |
| 593 | struct componentname *a_cnp; |
| 594 | } */ *ap; |
| 595 | { |
| 596 | register struct vnode *vp = ap->a_vp; |
| 597 | register struct vnode *tdvp = ap->a_tdvp; |
| 598 | register struct componentname *cnp = ap->a_cnp; |
| 599 | register struct inode *ip; |
| 600 | struct timeval tv; |
| 601 | int error; |
| 602 | |
| 603 | if (vp->v_mount != tdvp->v_mount) { |
| 604 | VOP_ABORTOP(vp, cnp); |
| 605 | if (tdvp == vp) |
| 606 | vrele(vp); |
| 607 | else |
| 608 | vput(vp); |
| 609 | return (EXDEV); |
| 610 | } |
| 611 | |
| 612 | #ifdef DIAGNOSTIC |
| 613 | if ((cnp->cn_flags & HASBUF) == 0) |
| 614 | panic("ufs_link: no name"); |
| 615 | #endif |
| 616 | ip = VTOI(tdvp); |
| 617 | if ((nlink_t)ip->i_nlink >= LINK_MAX) { |
| 618 | free(cnp->cn_pnbuf, M_NAMEI); |
| 619 | return (EMLINK); |
| 620 | } |
| 621 | if (vp != tdvp) |
| 622 | ILOCK(ip); |
| 623 | ip->i_nlink++; |
| 624 | ip->i_flag |= ICHG; |
| 625 | tv = time; |
| 626 | error = VOP_UPDATE(tdvp, &tv, &tv, 1); |
| 627 | if (!error) |
| 628 | error = ufs_direnter(ip, vp, cnp); |
| 629 | if (vp != tdvp) |
| 630 | IUNLOCK(ip); |
| 631 | FREE(cnp->cn_pnbuf, M_NAMEI); |
| 632 | vput(vp); |
| 633 | if (error) { |
| 634 | ip->i_nlink--; |
| 635 | ip->i_flag |= ICHG; |
| 636 | } |
| 637 | return (error); |
| 638 | } |
| 639 | |
| 640 | |
| 641 | |
| 642 | /* |
| 643 | * relookup - lookup a path name component |
| 644 | * Used by lookup to re-aquire things. |
| 645 | */ |
| 646 | int |
| 647 | relookup(dvp, vpp, cnp) |
| 648 | struct vnode *dvp, **vpp; |
| 649 | struct componentname *cnp; |
| 650 | { |
| 651 | register struct vnode *dp = 0; /* the directory we are searching */ |
| 652 | struct vnode *tdp; /* saved dp */ |
| 653 | struct mount *mp; /* mount table entry */ |
| 654 | int docache; /* == 0 do not cache last component */ |
| 655 | int wantparent; /* 1 => wantparent or lockparent flag */ |
| 656 | int rdonly; /* lookup read-only flag bit */ |
| 657 | char *cp; /* DEBUG: check name ptr/len */ |
| 658 | int newhash; /* DEBUG: check name hash */ |
| 659 | int error = 0; |
| 660 | |
| 661 | /* |
| 662 | * Setup: break out flag bits into variables. |
| 663 | */ |
| 664 | wantparent = cnp->cn_flags & (LOCKPARENT|WANTPARENT); |
| 665 | docache = (cnp->cn_flags & NOCACHE) ^ NOCACHE; |
| 666 | if (cnp->cn_nameiop == DELETE || |
| 667 | (wantparent && cnp->cn_nameiop != CREATE)) |
| 668 | docache = 0; |
| 669 | rdonly = cnp->cn_flags & RDONLY; |
| 670 | cnp->cn_flags &= ~ISSYMLINK; |
| 671 | dp = dvp; |
| 672 | VOP_LOCK(dp); |
| 673 | |
| 674 | /* dirloop: */ |
| 675 | /* |
| 676 | * Search a new directory. |
| 677 | * |
| 678 | * The cn_hash value is for use by vfs_cache. |
| 679 | * The last component of the filename is left accessible via |
| 680 | * cnp->cn_nameptr for callers that need the name. Callers needing |
| 681 | * the name set the SAVENAME flag. When done, they assume |
| 682 | * responsibility for freeing the pathname buffer. |
| 683 | */ |
| 684 | #ifdef NAMEI_DIAGNOSTIC |
| 685 | for (newhash = 0, cp = cnp->cn_nameptr; *cp != 0 && *cp != '/'; cp++) |
| 686 | newhash += (unsigned char)*cp; |
| 687 | if (newhash != cnp->cn_hash) |
| 688 | panic("relookup: bad hash"); |
| 689 | if (cnp->cn_namelen != cp - cnp->cn_nameptr) |
| 690 | panic ("relookup: bad len"); |
| 691 | if (*cp != 0) |
| 692 | panic("relookup: not last component"); |
| 693 | printf("{%s}: ", cnp->cn_nameptr); |
| 694 | #endif |
| 695 | |
| 696 | /* |
| 697 | * Check for degenerate name (e.g. / or "") |
| 698 | * which is a way of talking about a directory, |
| 699 | * e.g. like "/." or ".". |
| 700 | */ |
| 701 | if (cnp->cn_nameptr[0] == '\0') { |
| 702 | if (cnp->cn_nameiop != LOOKUP || wantparent) { |
| 703 | error = EISDIR; |
| 704 | goto bad; |
| 705 | } |
| 706 | if (dp->v_type != VDIR) { |
| 707 | error = ENOTDIR; |
| 708 | goto bad; |
| 709 | } |
| 710 | if (!(cnp->cn_flags & LOCKLEAF)) |
| 711 | VOP_UNLOCK(dp); |
| 712 | *vpp = dp; |
| 713 | if (cnp->cn_flags & SAVESTART) |
| 714 | panic("lookup: SAVESTART"); |
| 715 | return (0); |
| 716 | } |
| 717 | |
| 718 | if (cnp->cn_flags & ISDOTDOT) |
| 719 | panic ("relookup: lookup on dot-dot"); |
| 720 | |
| 721 | /* |
| 722 | * We now have a segment name to search for, and a directory to search. |
| 723 | */ |
| 724 | if (error = VOP_LOOKUP(dp, vpp, cnp)) { |
| 725 | #ifdef DIAGNOSTIC |
| 726 | if (*vpp != NULL) |
| 727 | panic("leaf should be empty"); |
| 728 | #endif |
| 729 | if (error != EJUSTRETURN) |
| 730 | goto bad; |
| 731 | /* |
| 732 | * If creating and at end of pathname, then can consider |
| 733 | * allowing file to be created. |
| 734 | */ |
| 735 | if (rdonly || (dvp->v_mount->mnt_flag & MNT_RDONLY)) { |
| 736 | error = EROFS; |
| 737 | goto bad; |
| 738 | } |
| 739 | /* ASSERT(dvp == ndp->ni_startdir) */ |
| 740 | if (cnp->cn_flags & SAVESTART) |
| 741 | VREF(dvp); |
| 742 | /* |
| 743 | * We return with ni_vp NULL to indicate that the entry |
| 744 | * doesn't currently exist, leaving a pointer to the |
| 745 | * (possibly locked) directory inode in ndp->ni_dvp. |
| 746 | */ |
| 747 | return (0); |
| 748 | } |
| 749 | dp = *vpp; |
| 750 | |
| 751 | #ifdef DIAGNOSTIC |
| 752 | /* |
| 753 | * Check for symbolic link |
| 754 | */ |
| 755 | if (dp->v_type == VLNK && (cnp->cn_flags & FOLLOW)) |
| 756 | panic ("relookup: symlink found.\n"); |
| 757 | #endif |
| 758 | |
| 759 | nextname: |
| 760 | /* |
| 761 | * Check for read-only file systems. |
| 762 | */ |
| 763 | if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME) { |
| 764 | /* |
| 765 | * Disallow directory write attempts on read-only |
| 766 | * file systems. |
| 767 | */ |
| 768 | if (rdonly || (dp->v_mount->mnt_flag & MNT_RDONLY) || |
| 769 | (wantparent && |
| 770 | (dvp->v_mount->mnt_flag & MNT_RDONLY))) { |
| 771 | error = EROFS; |
| 772 | goto bad2; |
| 773 | } |
| 774 | } |
| 775 | /* ASSERT(dvp == ndp->ni_startdir) */ |
| 776 | if (cnp->cn_flags & SAVESTART) |
| 777 | VREF(dvp); |
| 778 | |
| 779 | if (!wantparent) |
| 780 | vrele(dvp); |
| 781 | if ((cnp->cn_flags & LOCKLEAF) == 0) |
| 782 | VOP_UNLOCK(dp); |
| 783 | return (0); |
| 784 | |
| 785 | bad2: |
| 786 | if ((cnp->cn_flags & LOCKPARENT) && (cnp->cn_flags & ISLASTCN)) |
| 787 | VOP_UNLOCK(dvp); |
| 788 | vrele(dvp); |
| 789 | bad: |
| 790 | vput(dp); |
| 791 | *vpp = NULL; |
| 792 | return (error); |
| 793 | } |
| 794 | |
| 795 | |
| 796 | /* |
| 797 | * Rename system call. |
| 798 | * rename("foo", "bar"); |
| 799 | * is essentially |
| 800 | * unlink("bar"); |
| 801 | * link("foo", "bar"); |
| 802 | * unlink("foo"); |
| 803 | * but ``atomically''. Can't do full commit without saving state in the |
| 804 | * inode on disk which isn't feasible at this time. Best we can do is |
| 805 | * always guarantee the target exists. |
| 806 | * |
| 807 | * Basic algorithm is: |
| 808 | * |
| 809 | * 1) Bump link count on source while we're linking it to the |
| 810 | * target. This also ensure the inode won't be deleted out |
| 811 | * from underneath us while we work (it may be truncated by |
| 812 | * a concurrent `trunc' or `open' for creation). |
| 813 | * 2) Link source to destination. If destination already exists, |
| 814 | * delete it first. |
| 815 | * 3) Unlink source reference to inode if still around. If a |
| 816 | * directory was moved and the parent of the destination |
| 817 | * is different from the source, patch the ".." entry in the |
| 818 | * directory. |
| 819 | */ |
| 820 | int |
| 821 | ufs_rename(ap) |
| 822 | struct vop_rename_args /* { |
| 823 | struct vnode *a_fdvp; |
| 824 | struct vnode *a_fvp; |
| 825 | struct componentname *a_fcnp; |
| 826 | struct vnode *a_tdvp; |
| 827 | struct vnode *a_tvp; |
| 828 | struct componentname *a_tcnp; |
| 829 | } */ *ap; |
| 830 | { |
| 831 | struct vnode *tvp = ap->a_tvp; |
| 832 | register struct vnode *tdvp = ap->a_tdvp; |
| 833 | struct vnode *fvp = ap->a_fvp; |
| 834 | register struct vnode *fdvp = ap->a_fdvp; |
| 835 | register struct componentname *tcnp = ap->a_tcnp; |
| 836 | register struct componentname *fcnp = ap->a_fcnp; |
| 837 | register struct inode *ip, *xp, *dp; |
| 838 | struct dirtemplate dirbuf; |
| 839 | struct timeval tv; |
| 840 | int doingdirectory = 0, oldparent = 0, newparent = 0; |
| 841 | int error = 0; |
| 842 | int fdvpneedsrele = 1, tdvpneedsrele = 1; |
| 843 | u_char namlen; |
| 844 | |
| 845 | /* Check for cross-device rename */ |
| 846 | if ((fvp->v_mount != tdvp->v_mount) || |
| 847 | (tvp && (fvp->v_mount != tvp->v_mount))) { |
| 848 | VOP_ABORTOP(tdvp, tcnp); /* XXX, why not in NFS? */ |
| 849 | if (tdvp == tvp) |
| 850 | vrele(tdvp); |
| 851 | else |
| 852 | vput(tdvp); |
| 853 | if (tvp) |
| 854 | vput(tvp); |
| 855 | VOP_ABORTOP(fdvp, fcnp); /* XXX, why not in NFS? */ |
| 856 | vrele(fdvp); |
| 857 | vrele(fvp); |
| 858 | return (EXDEV); |
| 859 | } |
| 860 | |
| 861 | #ifdef DIAGNOSTIC |
| 862 | if ((tcnp->cn_flags & HASBUF) == 0 || |
| 863 | (fcnp->cn_flags & HASBUF) == 0) |
| 864 | panic("ufs_rename: no name"); |
| 865 | #endif |
| 866 | dp = VTOI(fdvp); |
| 867 | ip = VTOI(fvp); |
| 868 | /* |
| 869 | * Check if just deleting a link name. |
| 870 | */ |
| 871 | if (fvp == tvp) { |
| 872 | VOP_ABORTOP(tdvp, tcnp); |
| 873 | vput(tdvp); |
| 874 | vput(tvp); |
| 875 | vrele(fdvp); |
| 876 | if ((ip->i_mode&IFMT) == IFDIR) { |
| 877 | VOP_ABORTOP(fdvp, fcnp); |
| 878 | vrele(fvp); |
| 879 | return (EINVAL); |
| 880 | } |
| 881 | doingdirectory = 0; |
| 882 | goto unlinkit; |
| 883 | } |
| 884 | ILOCK(ip); |
| 885 | if ((ip->i_mode&IFMT) == IFDIR) { |
| 886 | /* |
| 887 | * Avoid ".", "..", and aliases of "." for obvious reasons. |
| 888 | */ |
| 889 | if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || |
| 890 | dp == ip || (fcnp->cn_flags&ISDOTDOT) || |
| 891 | (ip->i_flag & IRENAME)) { |
| 892 | VOP_ABORTOP(tdvp, tcnp); |
| 893 | vput(tdvp); |
| 894 | if (tvp) |
| 895 | vput(tvp); |
| 896 | VOP_ABORTOP(fdvp, fcnp); |
| 897 | vrele(fdvp); |
| 898 | vput(fvp); |
| 899 | return (EINVAL); |
| 900 | } |
| 901 | ip->i_flag |= IRENAME; |
| 902 | oldparent = dp->i_number; |
| 903 | doingdirectory++; |
| 904 | } |
| 905 | vrele(fdvp); |
| 906 | |
| 907 | /* |
| 908 | * 1) Bump link count while we're moving stuff |
| 909 | * around. If we crash somewhere before |
| 910 | * completing our work, the link count |
| 911 | * may be wrong, but correctable. |
| 912 | */ |
| 913 | ip->i_nlink++; |
| 914 | ip->i_flag |= ICHG; |
| 915 | tv = time; |
| 916 | error = VOP_UPDATE(fvp, &tv, &tv, 1); |
| 917 | IUNLOCK(ip); |
| 918 | |
| 919 | /* |
| 920 | * When the target exists, both the directory |
| 921 | * and target vnodes are returned locked. |
| 922 | */ |
| 923 | dp = VTOI(tdvp); |
| 924 | xp = NULL; |
| 925 | if (tvp) |
| 926 | xp = VTOI(tvp); |
| 927 | /* |
| 928 | * If ".." must be changed (ie the directory gets a new |
| 929 | * parent) then the source directory must not be in the |
| 930 | * directory heirarchy above the target, as this would |
| 931 | * orphan everything below the source directory. Also |
| 932 | * the user must have write permission in the source so |
| 933 | * as to be able to change "..". We must repeat the call |
| 934 | * to namei, as the parent directory is unlocked by the |
| 935 | * call to checkpath(). |
| 936 | */ |
| 937 | if (oldparent != dp->i_number) |
| 938 | newparent = dp->i_number; |
| 939 | if (doingdirectory && newparent) { |
| 940 | VOP_LOCK(fvp); |
| 941 | error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_proc); |
| 942 | VOP_UNLOCK(fvp); |
| 943 | if (error) |
| 944 | goto bad; |
| 945 | if (xp != NULL) |
| 946 | ufs_iput(xp); |
| 947 | if (error = ufs_checkpath(ip, dp, tcnp->cn_cred)) |
| 948 | goto out; |
| 949 | if ((tcnp->cn_flags & SAVESTART) == 0) |
| 950 | panic("ufs_rename: lost to startdir"); |
| 951 | p->p_spare[1]--; |
| 952 | if (error = relookup(tdvp, &tvp, tcnp)) |
| 953 | goto out; |
| 954 | dp = VTOI(tdvp); |
| 955 | xp = NULL; |
| 956 | if (tvp) |
| 957 | xp = VTOI(tvp); |
| 958 | } |
| 959 | /* |
| 960 | * 2) If target doesn't exist, link the target |
| 961 | * to the source and unlink the source. |
| 962 | * Otherwise, rewrite the target directory |
| 963 | * entry to reference the source inode and |
| 964 | * expunge the original entry's existence. |
| 965 | */ |
| 966 | if (xp == NULL) { |
| 967 | if (dp->i_dev != ip->i_dev) |
| 968 | panic("rename: EXDEV"); |
| 969 | /* |
| 970 | * Account for ".." in new directory. |
| 971 | * When source and destination have the same |
| 972 | * parent we don't fool with the link count. |
| 973 | */ |
| 974 | if (doingdirectory && newparent) { |
| 975 | if ((nlink_t)dp->i_nlink >= LINK_MAX) { |
| 976 | error = EMLINK; |
| 977 | goto bad; |
| 978 | } |
| 979 | dp->i_nlink++; |
| 980 | dp->i_flag |= ICHG; |
| 981 | if (error = VOP_UPDATE(ITOV(dp), &tv, &tv, 1)) |
| 982 | goto bad; |
| 983 | } |
| 984 | if (error = ufs_direnter(ip, tdvp, tcnp)) { |
| 985 | if (doingdirectory && newparent) { |
| 986 | dp->i_nlink--; |
| 987 | dp->i_flag |= ICHG; |
| 988 | (void)VOP_UPDATE(ITOV(dp), &tv, &tv, 1); |
| 989 | } |
| 990 | goto bad; |
| 991 | } |
| 992 | ufs_iput(dp); |
| 993 | } else { |
| 994 | if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev) |
| 995 | panic("rename: EXDEV"); |
| 996 | /* |
| 997 | * Short circuit rename(foo, foo). |
| 998 | */ |
| 999 | if (xp->i_number == ip->i_number) |
| 1000 | panic("rename: same file"); |
| 1001 | /* |
| 1002 | * If the parent directory is "sticky", then the user must |
| 1003 | * own the parent directory, or the destination of the rename, |
| 1004 | * otherwise the destination may not be changed (except by |
| 1005 | * root). This implements append-only directories. |
| 1006 | */ |
| 1007 | if ((dp->i_mode & ISVTX) && tcnp->cn_cred->cr_uid != 0 && |
| 1008 | tcnp->cn_cred->cr_uid != dp->i_uid && |
| 1009 | xp->i_uid != tcnp->cn_cred->cr_uid) { |
| 1010 | error = EPERM; |
| 1011 | goto bad; |
| 1012 | } |
| 1013 | /* |
| 1014 | * Target must be empty if a directory and have no links |
| 1015 | * to it. Also, ensure source and target are compatible |
| 1016 | * (both directories, or both not directories). |
| 1017 | */ |
| 1018 | if ((xp->i_mode&IFMT) == IFDIR) { |
| 1019 | if (!ufs_dirempty(xp, dp->i_number, tcnp->cn_cred) || |
| 1020 | xp->i_nlink > 2) { |
| 1021 | error = ENOTEMPTY; |
| 1022 | goto bad; |
| 1023 | } |
| 1024 | if (!doingdirectory) { |
| 1025 | error = ENOTDIR; |
| 1026 | goto bad; |
| 1027 | } |
| 1028 | cache_purge(ITOV(dp)); |
| 1029 | } else if (doingdirectory) { |
| 1030 | error = EISDIR; |
| 1031 | goto bad; |
| 1032 | } |
| 1033 | if (error = ufs_dirrewrite(dp, ip, tcnp)) |
| 1034 | goto bad; |
| 1035 | /* |
| 1036 | * If the target directory is in the same |
| 1037 | * directory as the source directory, |
| 1038 | * decrement the link count on the parent |
| 1039 | * of the target directory. |
| 1040 | */ |
| 1041 | if (doingdirectory && !newparent) { |
| 1042 | dp->i_nlink--; |
| 1043 | dp->i_flag |= ICHG; |
| 1044 | } |
| 1045 | ufs_iput(dp); |
| 1046 | /* |
| 1047 | * Adjust the link count of the target to |
| 1048 | * reflect the dirrewrite above. If this is |
| 1049 | * a directory it is empty and there are |
| 1050 | * no links to it, so we can squash the inode and |
| 1051 | * any space associated with it. We disallowed |
| 1052 | * renaming over top of a directory with links to |
| 1053 | * it above, as the remaining link would point to |
| 1054 | * a directory without "." or ".." entries. |
| 1055 | */ |
| 1056 | xp->i_nlink--; |
| 1057 | if (doingdirectory) { |
| 1058 | if (--xp->i_nlink != 0) |
| 1059 | panic("rename: linked directory"); |
| 1060 | error = VOP_TRUNCATE(ITOV(xp), (off_t)0, IO_SYNC, |
| 1061 | tcnp->cn_cred, tcnp->cn_proc); |
| 1062 | } |
| 1063 | xp->i_flag |= ICHG; |
| 1064 | ufs_iput(xp); |
| 1065 | xp = NULL; |
| 1066 | } |
| 1067 | |
| 1068 | /* |
| 1069 | * 3) Unlink the source. |
| 1070 | */ |
| 1071 | unlinkit: |
| 1072 | fcnp->cn_flags &= ~MODMASK; |
| 1073 | fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; |
| 1074 | if ((fcnp->cn_flags & SAVESTART) == 0) |
| 1075 | panic("ufs_rename: lost from startdir"); |
| 1076 | p->p_spare[1]--; |
| 1077 | (void) relookup(fdvp, &fvp, fcnp); |
| 1078 | if (fvp != NULL) { |
| 1079 | xp = VTOI(fvp); |
| 1080 | dp = VTOI(fdvp); |
| 1081 | } else { |
| 1082 | /* |
| 1083 | * From name has disappeared. |
| 1084 | */ |
| 1085 | if (doingdirectory) |
| 1086 | panic("rename: lost dir entry"); |
| 1087 | vrele(ITOV(ip)); |
| 1088 | return (0); |
| 1089 | } |
| 1090 | /* |
| 1091 | * Ensure that the directory entry still exists and has not |
| 1092 | * changed while the new name has been entered. If the source is |
| 1093 | * a file then the entry may have been unlinked or renamed. In |
| 1094 | * either case there is no further work to be done. If the source |
| 1095 | * is a directory then it cannot have been rmdir'ed; its link |
| 1096 | * count of three would cause a rmdir to fail with ENOTEMPTY. |
| 1097 | * The IRENAME flag ensures that it cannot be moved by another |
| 1098 | * rename. |
| 1099 | */ |
| 1100 | if (xp != ip) { |
| 1101 | if (doingdirectory) |
| 1102 | panic("rename: lost dir entry"); |
| 1103 | } else { |
| 1104 | /* |
| 1105 | * If the source is a directory with a |
| 1106 | * new parent, the link count of the old |
| 1107 | * parent directory must be decremented |
| 1108 | * and ".." set to point to the new parent. |
| 1109 | */ |
| 1110 | if (doingdirectory && newparent) { |
| 1111 | dp->i_nlink--; |
| 1112 | dp->i_flag |= ICHG; |
| 1113 | error = vn_rdwr(UIO_READ, ITOV(xp), (caddr_t)&dirbuf, |
| 1114 | sizeof (struct dirtemplate), (off_t)0, |
| 1115 | UIO_SYSSPACE, IO_NODELOCKED, |
| 1116 | tcnp->cn_cred, (int *)0, (struct proc *)0); |
| 1117 | if (error == 0) { |
| 1118 | # if (BYTE_ORDER == LITTLE_ENDIAN) |
| 1119 | if (fvp->v_mount->mnt_maxsymlinklen <= 0) |
| 1120 | namlen = dirbuf.dotdot_type; |
| 1121 | else |
| 1122 | namlen = dirbuf.dotdot_namlen; |
| 1123 | # else |
| 1124 | namlen = dirbuf.dotdot_namlen; |
| 1125 | # endif |
| 1126 | if (namlen != 2 || |
| 1127 | dirbuf.dotdot_name[0] != '.' || |
| 1128 | dirbuf.dotdot_name[1] != '.') { |
| 1129 | ufs_dirbad(xp, (doff_t)12, |
| 1130 | "rename: mangled dir"); |
| 1131 | } else { |
| 1132 | dirbuf.dotdot_ino = newparent; |
| 1133 | (void) vn_rdwr(UIO_WRITE, ITOV(xp), |
| 1134 | (caddr_t)&dirbuf, |
| 1135 | sizeof (struct dirtemplate), |
| 1136 | (off_t)0, UIO_SYSSPACE, |
| 1137 | IO_NODELOCKED|IO_SYNC, |
| 1138 | tcnp->cn_cred, (int *)0, |
| 1139 | (struct proc *)0); |
| 1140 | cache_purge(ITOV(dp)); |
| 1141 | } |
| 1142 | } |
| 1143 | } |
| 1144 | error = ufs_dirremove(fdvp, fcnp); |
| 1145 | if (!error) { |
| 1146 | xp->i_nlink--; |
| 1147 | xp->i_flag |= ICHG; |
| 1148 | } |
| 1149 | xp->i_flag &= ~IRENAME; |
| 1150 | } |
| 1151 | if (dp) |
| 1152 | vput(ITOV(dp)); |
| 1153 | if (xp) |
| 1154 | vput(ITOV(xp)); |
| 1155 | vrele(ITOV(ip)); |
| 1156 | return (error); |
| 1157 | |
| 1158 | bad: |
| 1159 | if (xp) |
| 1160 | vput(ITOV(xp)); |
| 1161 | vput(ITOV(dp)); |
| 1162 | out: |
| 1163 | ip->i_nlink--; |
| 1164 | ip->i_flag |= ICHG; |
| 1165 | vrele(ITOV(ip)); |
| 1166 | return (error); |
| 1167 | } |
| 1168 | |
| 1169 | /* |
| 1170 | * A virgin directory (no blushing please). |
| 1171 | */ |
| 1172 | static struct dirtemplate mastertemplate = { |
| 1173 | 0, 12, DT_DIR, 1, ".", |
| 1174 | 0, DIRBLKSIZ - 12, DT_DIR, 2, ".." |
| 1175 | }; |
| 1176 | static struct odirtemplate omastertemplate = { |
| 1177 | 0, 12, 1, ".", |
| 1178 | 0, DIRBLKSIZ - 12, 2, ".." |
| 1179 | }; |
| 1180 | |
| 1181 | /* |
| 1182 | * Mkdir system call |
| 1183 | */ |
| 1184 | int |
| 1185 | ufs_mkdir(ap) |
| 1186 | struct vop_mkdir_args /* { |
| 1187 | struct vnode *a_dvp; |
| 1188 | struct vnode **a_vpp; |
| 1189 | struct componentname *a_cnp; |
| 1190 | struct vattr *a_vap; |
| 1191 | } */ *ap; |
| 1192 | { |
| 1193 | register struct vnode *dvp = ap->a_dvp; |
| 1194 | register struct vattr *vap = ap->a_vap; |
| 1195 | register struct componentname *cnp = ap->a_cnp; |
| 1196 | register struct inode *ip, *dp; |
| 1197 | struct vnode *tvp; |
| 1198 | struct dirtemplate dirtemplate, *dtp; |
| 1199 | struct timeval tv; |
| 1200 | int error, dmode; |
| 1201 | |
| 1202 | #ifdef DIAGNOSTIC |
| 1203 | if ((cnp->cn_flags & HASBUF) == 0) |
| 1204 | panic("ufs_mkdir: no name"); |
| 1205 | #endif |
| 1206 | dp = VTOI(dvp); |
| 1207 | if ((nlink_t)dp->i_nlink >= LINK_MAX) { |
| 1208 | free(cnp->cn_pnbuf, M_NAMEI); |
| 1209 | ufs_iput(dp); |
| 1210 | return (EMLINK); |
| 1211 | } |
| 1212 | dmode = vap->va_mode&0777; |
| 1213 | dmode |= IFDIR; |
| 1214 | /* |
| 1215 | * Must simulate part of maknode here to acquire the inode, but |
| 1216 | * not have it entered in the parent directory. The entry is made |
| 1217 | * later after writing "." and ".." entries. |
| 1218 | */ |
| 1219 | if (error = VOP_VALLOC(dvp, dmode, cnp->cn_cred, &tvp)) { |
| 1220 | free(cnp->cn_pnbuf, M_NAMEI); |
| 1221 | ufs_iput(dp); |
| 1222 | return (error); |
| 1223 | } |
| 1224 | ip = VTOI(tvp); |
| 1225 | ip->i_uid = cnp->cn_cred->cr_uid; |
| 1226 | ip->i_gid = dp->i_gid; |
| 1227 | #ifdef QUOTA |
| 1228 | if ((error = getinoquota(ip)) || |
| 1229 | (error = chkiq(ip, 1, cnp->cn_cred, 0))) { |
| 1230 | free(cnp->cn_pnbuf, M_NAMEI); |
| 1231 | VOP_VFREE(tvp, ip->i_number, dmode); |
| 1232 | ufs_iput(ip); |
| 1233 | ufs_iput(dp); |
| 1234 | return (error); |
| 1235 | } |
| 1236 | #endif |
| 1237 | ip->i_flag |= IACC|IUPD|ICHG; |
| 1238 | ip->i_mode = dmode; |
| 1239 | ITOV(ip)->v_type = VDIR; /* Rest init'd in iget() */ |
| 1240 | ip->i_nlink = 2; |
| 1241 | tv = time; |
| 1242 | error = VOP_UPDATE(ITOV(ip), &tv, &tv, 1); |
| 1243 | |
| 1244 | /* |
| 1245 | * Bump link count in parent directory |
| 1246 | * to reflect work done below. Should |
| 1247 | * be done before reference is created |
| 1248 | * so reparation is possible if we crash. |
| 1249 | */ |
| 1250 | dp->i_nlink++; |
| 1251 | dp->i_flag |= ICHG; |
| 1252 | if (error = VOP_UPDATE(ITOV(dp), &tv, &tv, 1)) |
| 1253 | goto bad; |
| 1254 | |
| 1255 | /* Initialize directory with "." and ".." from static template. */ |
| 1256 | if (dvp->v_mount->mnt_maxsymlinklen > 0) |
| 1257 | dtp = &mastertemplate; |
| 1258 | else |
| 1259 | dtp = (struct dirtemplate *)&omastertemplate; |
| 1260 | dirtemplate = *dtp; |
| 1261 | dirtemplate.dot_ino = ip->i_number; |
| 1262 | dirtemplate.dotdot_ino = dp->i_number; |
| 1263 | error = vn_rdwr(UIO_WRITE, ITOV(ip), (caddr_t)&dirtemplate, |
| 1264 | sizeof (dirtemplate), (off_t)0, UIO_SYSSPACE, |
| 1265 | IO_NODELOCKED|IO_SYNC, cnp->cn_cred, (int *)0, (struct proc *)0); |
| 1266 | if (error) { |
| 1267 | dp->i_nlink--; |
| 1268 | dp->i_flag |= ICHG; |
| 1269 | goto bad; |
| 1270 | } |
| 1271 | if (DIRBLKSIZ > VFSTOUFS(dvp->v_mount)->um_mountp->mnt_stat.f_bsize) |
| 1272 | panic("ufs_mkdir: blksize"); /* XXX should grow with balloc() */ |
| 1273 | else { |
| 1274 | ip->i_size = DIRBLKSIZ; |
| 1275 | ip->i_flag |= ICHG; |
| 1276 | } |
| 1277 | |
| 1278 | /* Directory set up, now install it's entry in the parent directory. */ |
| 1279 | if (error = ufs_direnter(ip, dvp, cnp)) { |
| 1280 | dp->i_nlink--; |
| 1281 | dp->i_flag |= ICHG; |
| 1282 | } |
| 1283 | bad: |
| 1284 | /* |
| 1285 | * No need to do an explicit VOP_TRUNCATE here, vrele will do this |
| 1286 | * for us because we set the link count to 0. |
| 1287 | */ |
| 1288 | if (error) { |
| 1289 | ip->i_nlink = 0; |
| 1290 | ip->i_flag |= ICHG; |
| 1291 | ufs_iput(ip); |
| 1292 | } else |
| 1293 | *ap->a_vpp = ITOV(ip); |
| 1294 | FREE(cnp->cn_pnbuf, M_NAMEI); |
| 1295 | ufs_iput(dp); |
| 1296 | return (error); |
| 1297 | } |
| 1298 | |
| 1299 | /* |
| 1300 | * Rmdir system call. |
| 1301 | */ |
| 1302 | int |
| 1303 | ufs_rmdir(ap) |
| 1304 | struct vop_rmdir_args /* { |
| 1305 | struct vnode *a_dvp; |
| 1306 | struct vnode *a_vp; |
| 1307 | struct componentname *a_cnp; |
| 1308 | } */ *ap; |
| 1309 | { |
| 1310 | register struct vnode *dvp = ap->a_dvp; |
| 1311 | register struct componentname *cnp = ap->a_cnp; |
| 1312 | register struct inode *ip, *dp; |
| 1313 | int error; |
| 1314 | |
| 1315 | ip = VTOI(ap->a_vp); |
| 1316 | dp = VTOI(dvp); |
| 1317 | /* |
| 1318 | * No rmdir "." please. |
| 1319 | */ |
| 1320 | if (dp == ip) { |
| 1321 | vrele(dvp); |
| 1322 | ufs_iput(ip); |
| 1323 | return (EINVAL); |
| 1324 | } |
| 1325 | /* |
| 1326 | * Verify the directory is empty (and valid). |
| 1327 | * (Rmdir ".." won't be valid since |
| 1328 | * ".." will contain a reference to |
| 1329 | * the current directory and thus be |
| 1330 | * non-empty.) |
| 1331 | */ |
| 1332 | error = 0; |
| 1333 | if (ip->i_nlink != 2 || |
| 1334 | !ufs_dirempty(ip, dp->i_number, cnp->cn_cred)) { |
| 1335 | error = ENOTEMPTY; |
| 1336 | goto out; |
| 1337 | } |
| 1338 | /* |
| 1339 | * Delete reference to directory before purging |
| 1340 | * inode. If we crash in between, the directory |
| 1341 | * will be reattached to lost+found, |
| 1342 | */ |
| 1343 | if (error = ufs_dirremove(dvp, cnp)) |
| 1344 | goto out; |
| 1345 | dp->i_nlink--; |
| 1346 | dp->i_flag |= ICHG; |
| 1347 | cache_purge(dvp); |
| 1348 | ufs_iput(dp); |
| 1349 | dvp = NULL; |
| 1350 | /* |
| 1351 | * Truncate inode. The only stuff left |
| 1352 | * in the directory is "." and "..". The |
| 1353 | * "." reference is inconsequential since |
| 1354 | * we're quashing it. The ".." reference |
| 1355 | * has already been adjusted above. We've |
| 1356 | * removed the "." reference and the reference |
| 1357 | * in the parent directory, but there may be |
| 1358 | * other hard links so decrement by 2 and |
| 1359 | * worry about them later. |
| 1360 | */ |
| 1361 | ip->i_nlink -= 2; |
| 1362 | error = VOP_TRUNCATE(ap->a_vp, (off_t)0, IO_SYNC, cnp->cn_cred, |
| 1363 | cnp->cn_proc); |
| 1364 | cache_purge(ITOV(ip)); |
| 1365 | out: |
| 1366 | if (dvp) |
| 1367 | ufs_iput(dp); |
| 1368 | ufs_iput(ip); |
| 1369 | return (error); |
| 1370 | } |
| 1371 | |
| 1372 | /* |
| 1373 | * symlink -- make a symbolic link |
| 1374 | */ |
| 1375 | int |
| 1376 | ufs_symlink(ap) |
| 1377 | struct vop_symlink_args /* { |
| 1378 | struct vnode *a_dvp; |
| 1379 | struct vnode **a_vpp; |
| 1380 | struct componentname *a_cnp; |
| 1381 | struct vattr *a_vap; |
| 1382 | char *a_target; |
| 1383 | } */ *ap; |
| 1384 | { |
| 1385 | register struct vnode *vp, **vpp = ap->a_vpp; |
| 1386 | register struct inode *ip; |
| 1387 | int len, error; |
| 1388 | |
| 1389 | if (error = ufs_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp, |
| 1390 | vpp, ap->a_cnp)) |
| 1391 | return (error); |
| 1392 | vp = *vpp; |
| 1393 | len = strlen(ap->a_target); |
| 1394 | if (len < vp->v_mount->mnt_maxsymlinklen) { |
| 1395 | ip = VTOI(vp); |
| 1396 | bcopy(ap->a_target, (char *)ip->i_shortlink, len); |
| 1397 | ip->i_size = len; |
| 1398 | ip->i_flag |= IUPD|ICHG; |
| 1399 | } else |
| 1400 | error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0, |
| 1401 | UIO_SYSSPACE, IO_NODELOCKED, ap->a_cnp->cn_cred, (int *)0, |
| 1402 | (struct proc *)0); |
| 1403 | vput(vp); |
| 1404 | return (error); |
| 1405 | } |
| 1406 | |
| 1407 | /* |
| 1408 | * Vnode op for reading directories. |
| 1409 | * |
| 1410 | * The routine below assumes that the on-disk format of a directory |
| 1411 | * is the same as that defined by <sys/dirent.h>. If the on-disk |
| 1412 | * format changes, then it will be necessary to do a conversion |
| 1413 | * from the on-disk format that read returns to the format defined |
| 1414 | * by <sys/dirent.h>. |
| 1415 | */ |
| 1416 | int |
| 1417 | ufs_readdir(ap) |
| 1418 | struct vop_readdir_args /* { |
| 1419 | struct vnode *a_vp; |
| 1420 | struct uio *a_uio; |
| 1421 | struct ucred *a_cred; |
| 1422 | } */ *ap; |
| 1423 | { |
| 1424 | register struct uio *uio = ap->a_uio; |
| 1425 | int count, lost, error; |
| 1426 | |
| 1427 | count = uio->uio_resid; |
| 1428 | count &= ~(DIRBLKSIZ - 1); |
| 1429 | lost = uio->uio_resid - count; |
| 1430 | if (count < DIRBLKSIZ || (uio->uio_offset & (DIRBLKSIZ -1))) |
| 1431 | return (EINVAL); |
| 1432 | uio->uio_resid = count; |
| 1433 | uio->uio_iov->iov_len = count; |
| 1434 | # if (BYTE_ORDER == LITTLE_ENDIAN) |
| 1435 | if (ap->a_vp->v_mount->mnt_maxsymlinklen > 0) { |
| 1436 | error = VOP_READ(ap->a_vp, uio, 0, ap->a_cred); |
| 1437 | } else { |
| 1438 | struct dirent *dp, *edp; |
| 1439 | struct uio auio; |
| 1440 | struct iovec aiov; |
| 1441 | caddr_t dirbuf; |
| 1442 | int readcnt; |
| 1443 | u_char tmp; |
| 1444 | |
| 1445 | auio = *uio; |
| 1446 | auio.uio_iov = &aiov; |
| 1447 | auio.uio_iovcnt = 1; |
| 1448 | auio.uio_segflg = UIO_SYSSPACE; |
| 1449 | aiov.iov_len = count; |
| 1450 | MALLOC(dirbuf, caddr_t, count, M_TEMP, M_WAITOK); |
| 1451 | aiov.iov_base = dirbuf; |
| 1452 | error = VOP_READ(ap->a_vp, uio, 0, ap->a_cred); |
| 1453 | if (error == 0) { |
| 1454 | readcnt = count - auio.uio_resid; |
| 1455 | edp = (struct dirent *)&dirbuf[readcnt]; |
| 1456 | for (dp = (struct dirent *)dirbuf; dp < edp; ) { |
| 1457 | tmp = dp->d_namlen; |
| 1458 | dp->d_namlen = dp->d_type; |
| 1459 | dp->d_type = tmp; |
| 1460 | if (dp->d_reclen > 0) { |
| 1461 | dp = (struct dirent *) |
| 1462 | ((char *)dp + dp->d_reclen); |
| 1463 | } else { |
| 1464 | error = EIO; |
| 1465 | break; |
| 1466 | } |
| 1467 | } |
| 1468 | if (dp >= edp) |
| 1469 | error = uiomove(dirbuf, readcnt, uio); |
| 1470 | } |
| 1471 | FREE(dirbuf, M_TEMP); |
| 1472 | } |
| 1473 | # else |
| 1474 | error = VOP_READ(ap->a_vp, uio, 0, ap->a_cred); |
| 1475 | # endif |
| 1476 | uio->uio_resid += lost; |
| 1477 | return (error); |
| 1478 | } |
| 1479 | |
| 1480 | /* |
| 1481 | * Return target name of a symbolic link |
| 1482 | */ |
| 1483 | int |
| 1484 | ufs_readlink(ap) |
| 1485 | struct vop_readlink_args /* { |
| 1486 | struct vnode *a_vp; |
| 1487 | struct uio *a_uio; |
| 1488 | struct ucred *a_cred; |
| 1489 | } */ *ap; |
| 1490 | { |
| 1491 | register struct vnode *vp = ap->a_vp; |
| 1492 | register struct inode *ip = VTOI(vp); |
| 1493 | |
| 1494 | if (ip->i_size < vp->v_mount->mnt_maxsymlinklen) { |
| 1495 | uiomove((char *)ip->i_shortlink, (int)ip->i_size, ap->a_uio); |
| 1496 | return (0); |
| 1497 | } |
| 1498 | return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); |
| 1499 | } |
| 1500 | |
| 1501 | /* |
| 1502 | * Ufs abort op, called after namei() when a CREATE/DELETE isn't actually |
| 1503 | * done. If a buffer has been saved in anticipation of a CREATE, delete it. |
| 1504 | */ |
| 1505 | /* ARGSUSED */ |
| 1506 | int |
| 1507 | ufs_abortop(ap) |
| 1508 | struct vop_abortop_args /* { |
| 1509 | struct vnode *a_dvp; |
| 1510 | struct componentname *a_cnp; |
| 1511 | } */ *ap; |
| 1512 | { |
| 1513 | if ((ap->a_cnp->cn_flags & (HASBUF | SAVESTART)) == HASBUF) |
| 1514 | FREE(ap->a_cnp->cn_pnbuf, M_NAMEI); |
| 1515 | return (0); |
| 1516 | } |
| 1517 | |
| 1518 | /* |
| 1519 | * Lock an inode. |
| 1520 | */ |
| 1521 | int |
| 1522 | ufs_lock(ap) |
| 1523 | struct vop_lock_args /* { |
| 1524 | struct vnode *a_vp; |
| 1525 | } */ *ap; |
| 1526 | { |
| 1527 | register struct inode *ip = VTOI(ap->a_vp); |
| 1528 | |
| 1529 | ILOCK(ip); |
| 1530 | return (0); |
| 1531 | } |
| 1532 | |
| 1533 | /* |
| 1534 | * Unlock an inode. |
| 1535 | */ |
| 1536 | int |
| 1537 | ufs_unlock(ap) |
| 1538 | struct vop_unlock_args /* { |
| 1539 | struct vnode *a_vp; |
| 1540 | } */ *ap; |
| 1541 | { |
| 1542 | register struct inode *ip = VTOI(ap->a_vp); |
| 1543 | |
| 1544 | if (!(ip->i_flag & ILOCKED)) |
| 1545 | panic("ufs_unlock NOT LOCKED"); |
| 1546 | IUNLOCK(ip); |
| 1547 | return (0); |
| 1548 | } |
| 1549 | |
| 1550 | /* |
| 1551 | * Check for a locked inode. |
| 1552 | */ |
| 1553 | int |
| 1554 | ufs_islocked(ap) |
| 1555 | struct vop_islocked_args /* { |
| 1556 | struct vnode *a_vp; |
| 1557 | } */ *ap; |
| 1558 | { |
| 1559 | |
| 1560 | if (VTOI(ap->a_vp)->i_flag & ILOCKED) |
| 1561 | return (1); |
| 1562 | return (0); |
| 1563 | } |
| 1564 | |
| 1565 | /* |
| 1566 | * Calculate the logical to physical mapping if not done already, |
| 1567 | * then call the device strategy routine. |
| 1568 | */ |
| 1569 | int |
| 1570 | ufs_strategy(ap) |
| 1571 | struct vop_strategy_args /* { |
| 1572 | struct buf *a_bp; |
| 1573 | } */ *ap; |
| 1574 | { |
| 1575 | register struct buf *bp = ap->a_bp; |
| 1576 | register struct vnode *vp = bp->b_vp; |
| 1577 | register struct inode *ip; |
| 1578 | int error; |
| 1579 | |
| 1580 | ip = VTOI(vp); |
| 1581 | if (vp->v_type == VBLK || vp->v_type == VCHR) |
| 1582 | panic("ufs_strategy: spec"); |
| 1583 | if (bp->b_blkno == bp->b_lblkno) { |
| 1584 | if (error = |
| 1585 | VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno)) { |
| 1586 | bp->b_error = error; |
| 1587 | bp->b_flags |= B_ERROR; |
| 1588 | biodone(bp); |
| 1589 | return (error); |
| 1590 | } |
| 1591 | if ((long)bp->b_blkno == -1) |
| 1592 | clrbuf(bp); |
| 1593 | } |
| 1594 | if ((long)bp->b_blkno == -1) { |
| 1595 | biodone(bp); |
| 1596 | return (0); |
| 1597 | } |
| 1598 | vp = ip->i_devvp; |
| 1599 | bp->b_dev = vp->v_rdev; |
| 1600 | VOCALL (vp->v_op, VOFFSET(vop_strategy), ap); |
| 1601 | return (0); |
| 1602 | } |
| 1603 | |
| 1604 | /* |
| 1605 | * Print out the contents of an inode. |
| 1606 | */ |
| 1607 | int |
| 1608 | ufs_print(ap) |
| 1609 | struct vop_print_args /* { |
| 1610 | struct vnode *a_vp; |
| 1611 | } */ *ap; |
| 1612 | { |
| 1613 | register struct vnode *vp = ap->a_vp; |
| 1614 | register struct inode *ip = VTOI(vp); |
| 1615 | |
| 1616 | printf("tag VT_UFS, ino %d, on dev %d, %d", ip->i_number, |
| 1617 | major(ip->i_dev), minor(ip->i_dev)); |
| 1618 | #ifdef FIFO |
| 1619 | if (vp->v_type == VFIFO) |
| 1620 | fifo_printinfo(vp); |
| 1621 | #endif /* FIFO */ |
| 1622 | printf("%s\n", (ip->i_flag & ILOCKED) ? " (LOCKED)" : ""); |
| 1623 | if (ip->i_lockholder == 0) |
| 1624 | return (0); |
| 1625 | printf("\towner pid %d", ip->i_lockholder); |
| 1626 | if (ip->i_lockwaiter) |
| 1627 | printf(" waiting pid %d", ip->i_lockwaiter); |
| 1628 | printf("\n"); |
| 1629 | return (0); |
| 1630 | } |
| 1631 | |
| 1632 | /* |
| 1633 | * Read wrapper for special devices. |
| 1634 | */ |
| 1635 | int |
| 1636 | ufsspec_read(ap) |
| 1637 | struct vop_read_args /* { |
| 1638 | struct vnode *a_vp; |
| 1639 | struct uio *a_uio; |
| 1640 | int a_ioflag; |
| 1641 | struct ucred *a_cred; |
| 1642 | } */ *ap; |
| 1643 | { |
| 1644 | extern int (**spec_vnodeop_p)(); |
| 1645 | |
| 1646 | /* |
| 1647 | * Set access flag. |
| 1648 | */ |
| 1649 | VTOI(ap->a_vp)->i_flag |= IACC; |
| 1650 | return (VOCALL (spec_vnodeop_p, VOFFSET(vop_read), ap)); |
| 1651 | } |
| 1652 | |
| 1653 | /* |
| 1654 | * Write wrapper for special devices. |
| 1655 | */ |
| 1656 | int |
| 1657 | ufsspec_write(ap) |
| 1658 | struct vop_write_args /* { |
| 1659 | struct vnode *a_vp; |
| 1660 | struct uio *a_uio; |
| 1661 | int a_ioflag; |
| 1662 | struct ucred *a_cred; |
| 1663 | } */ *ap; |
| 1664 | { |
| 1665 | extern int (**spec_vnodeop_p)(); |
| 1666 | |
| 1667 | /* |
| 1668 | * Set update and change flags. |
| 1669 | */ |
| 1670 | VTOI(ap->a_vp)->i_flag |= IUPD|ICHG; |
| 1671 | return (VOCALL (spec_vnodeop_p, VOFFSET(vop_write), ap)); |
| 1672 | } |
| 1673 | |
| 1674 | /* |
| 1675 | * Close wrapper for special devices. |
| 1676 | * |
| 1677 | * Update the times on the inode then do device close. |
| 1678 | */ |
| 1679 | int |
| 1680 | ufsspec_close(ap) |
| 1681 | struct vop_close_args /* { |
| 1682 | struct vnode *a_vp; |
| 1683 | int a_fflag; |
| 1684 | struct ucred *a_cred; |
| 1685 | struct proc *a_p; |
| 1686 | } */ *ap; |
| 1687 | { |
| 1688 | extern int (**spec_vnodeop_p)(); |
| 1689 | register struct inode *ip = VTOI(ap->a_vp); |
| 1690 | |
| 1691 | if (ap->a_vp->v_usecount > 1 && !(ip->i_flag & ILOCKED)) |
| 1692 | ITIMES(ip, &time, &time); |
| 1693 | return (VOCALL (spec_vnodeop_p, VOFFSET(vop_close), ap)); |
| 1694 | } |
| 1695 | |
| 1696 | #ifdef FIFO |
| 1697 | /* |
| 1698 | * Read wrapper for fifo's |
| 1699 | */ |
| 1700 | int |
| 1701 | ufsfifo_read(ap) |
| 1702 | struct vop_read_args /* { |
| 1703 | struct vnode *a_vp; |
| 1704 | struct uio *a_uio; |
| 1705 | int a_ioflag; |
| 1706 | struct ucred *a_cred; |
| 1707 | } */ *ap; |
| 1708 | { |
| 1709 | extern int (**fifo_vnodeop_p)(); |
| 1710 | |
| 1711 | /* |
| 1712 | * Set access flag. |
| 1713 | */ |
| 1714 | VTOI(ap->a_vp)->i_flag |= IACC; |
| 1715 | return (VOCALL (fifo_vnodeop_p, VOFFSET(vop_read), ap)); |
| 1716 | } |
| 1717 | |
| 1718 | /* |
| 1719 | * Write wrapper for fifo's. |
| 1720 | */ |
| 1721 | int |
| 1722 | ufsfifo_write(ap) |
| 1723 | struct vop_write_args /* { |
| 1724 | struct vnode *a_vp; |
| 1725 | struct uio *a_uio; |
| 1726 | int a_ioflag; |
| 1727 | struct ucred *a_cred; |
| 1728 | } */ *ap; |
| 1729 | { |
| 1730 | extern int (**fifo_vnodeop_p)(); |
| 1731 | |
| 1732 | /* |
| 1733 | * Set update and change flags. |
| 1734 | */ |
| 1735 | VTOI(ap->a_vp)->i_flag |= IUPD|ICHG; |
| 1736 | return (VOCALL (fifo_vnodeop_p, VOFFSET(vop_write), ap)); |
| 1737 | } |
| 1738 | |
| 1739 | /* |
| 1740 | * Close wrapper for fifo's. |
| 1741 | * |
| 1742 | * Update the times on the inode then do device close. |
| 1743 | */ |
| 1744 | ufsfifo_close(ap) |
| 1745 | struct vop_close_args /* { |
| 1746 | struct vnode *a_vp; |
| 1747 | int a_fflag; |
| 1748 | struct ucred *a_cred; |
| 1749 | struct proc *a_p; |
| 1750 | } */ *ap; |
| 1751 | { |
| 1752 | extern int (**fifo_vnodeop_p)(); |
| 1753 | register struct inode *ip = VTOI(ap->a_vp); |
| 1754 | |
| 1755 | if (ap->a_vp->v_usecount > 1 && !(ip->i_flag & ILOCKED)) |
| 1756 | ITIMES(ip, &time, &time); |
| 1757 | return (VOCALL (fifo_vnodeop_p, VOFFSET(vop_close), ap)); |
| 1758 | } |
| 1759 | #endif /* FIFO */ |
| 1760 | |
| 1761 | /* |
| 1762 | * Advisory record locking support |
| 1763 | */ |
| 1764 | int |
| 1765 | ufs_advlock(ap) |
| 1766 | struct vop_advlock_args /* { |
| 1767 | struct vnode *a_vp; |
| 1768 | caddr_t a_id; |
| 1769 | int a_op; |
| 1770 | struct flock *a_fl; |
| 1771 | int a_flags; |
| 1772 | } */ *ap; |
| 1773 | { |
| 1774 | register struct inode *ip = VTOI(ap->a_vp); |
| 1775 | register struct flock *fl = ap->a_fl; |
| 1776 | register struct lockf *lock; |
| 1777 | off_t start, end; |
| 1778 | int error; |
| 1779 | |
| 1780 | /* |
| 1781 | * Avoid the common case of unlocking when inode has no locks. |
| 1782 | */ |
| 1783 | if (ip->i_lockf == (struct lockf *)0) { |
| 1784 | if (ap->a_op != F_SETLK) { |
| 1785 | fl->l_type = F_UNLCK; |
| 1786 | return (0); |
| 1787 | } |
| 1788 | } |
| 1789 | /* |
| 1790 | * Convert the flock structure into a start and end. |
| 1791 | */ |
| 1792 | switch (fl->l_whence) { |
| 1793 | |
| 1794 | case SEEK_SET: |
| 1795 | case SEEK_CUR: |
| 1796 | /* |
| 1797 | * Caller is responsible for adding any necessary offset |
| 1798 | * when SEEK_CUR is used. |
| 1799 | */ |
| 1800 | start = fl->l_start; |
| 1801 | break; |
| 1802 | |
| 1803 | case SEEK_END: |
| 1804 | start = ip->i_size + fl->l_start; |
| 1805 | break; |
| 1806 | |
| 1807 | default: |
| 1808 | return (EINVAL); |
| 1809 | } |
| 1810 | if (start < 0) |
| 1811 | return (EINVAL); |
| 1812 | if (fl->l_len == 0) |
| 1813 | end = -1; |
| 1814 | else |
| 1815 | end = start + fl->l_len - 1; |
| 1816 | /* |
| 1817 | * Create the lockf structure |
| 1818 | */ |
| 1819 | MALLOC(lock, struct lockf *, sizeof *lock, M_LOCKF, M_WAITOK); |
| 1820 | lock->lf_start = start; |
| 1821 | lock->lf_end = end; |
| 1822 | lock->lf_id = ap->a_id; |
| 1823 | lock->lf_inode = ip; |
| 1824 | lock->lf_type = fl->l_type; |
| 1825 | lock->lf_next = (struct lockf *)0; |
| 1826 | lock->lf_block = (struct lockf *)0; |
| 1827 | lock->lf_flags = ap->a_flags; |
| 1828 | /* |
| 1829 | * Do the requested operation. |
| 1830 | */ |
| 1831 | switch(ap->a_op) { |
| 1832 | case F_SETLK: |
| 1833 | return (lf_setlock(lock)); |
| 1834 | |
| 1835 | case F_UNLCK: |
| 1836 | error = lf_clearlock(lock); |
| 1837 | FREE(lock, M_LOCKF); |
| 1838 | return (error); |
| 1839 | |
| 1840 | case F_GETLK: |
| 1841 | error = lf_getlock(lock, fl); |
| 1842 | FREE(lock, M_LOCKF); |
| 1843 | return (error); |
| 1844 | |
| 1845 | default: |
| 1846 | free(lock, M_LOCKF); |
| 1847 | return (EINVAL); |
| 1848 | } |
| 1849 | /* NOTREACHED */ |
| 1850 | } |
| 1851 | |
| 1852 | /* |
| 1853 | * Initialize the vnode associated with a new inode, handle aliased |
| 1854 | * vnodes. |
| 1855 | */ |
| 1856 | int |
| 1857 | ufs_vinit(mntp, specops, fifoops, vpp) |
| 1858 | struct mount *mntp; |
| 1859 | int (**specops)(); |
| 1860 | int (**fifoops)(); |
| 1861 | struct vnode **vpp; |
| 1862 | { |
| 1863 | struct inode *ip, *nip; |
| 1864 | struct vnode *vp, *nvp; |
| 1865 | extern int (**spec_vnodeop_p)(); |
| 1866 | |
| 1867 | vp = *vpp; |
| 1868 | ip = VTOI(vp); |
| 1869 | switch(vp->v_type = IFTOVT(ip->i_mode)) { |
| 1870 | case VCHR: |
| 1871 | case VBLK: |
| 1872 | vp->v_op = specops; |
| 1873 | if (nvp = checkalias(vp, ip->i_rdev, mntp)) { |
| 1874 | /* |
| 1875 | * Discard unneeded vnode, but save its inode. |
| 1876 | */ |
| 1877 | remque(ip); |
| 1878 | IUNLOCK(ip); |
| 1879 | nvp->v_data = vp->v_data; |
| 1880 | vp->v_data = NULL; |
| 1881 | vp->v_op = spec_vnodeop_p; |
| 1882 | vrele(vp); |
| 1883 | vgone(vp); |
| 1884 | /* |
| 1885 | * Reinitialize aliased inode. |
| 1886 | */ |
| 1887 | vp = nvp; |
| 1888 | ip->i_vnode = vp; |
| 1889 | ufs_ihashins(ip); |
| 1890 | } |
| 1891 | break; |
| 1892 | case VFIFO: |
| 1893 | #ifdef FIFO |
| 1894 | vp->v_op = fifoops; |
| 1895 | break; |
| 1896 | #else |
| 1897 | return (EOPNOTSUPP); |
| 1898 | #endif |
| 1899 | } |
| 1900 | if (ip->i_number == ROOTINO) |
| 1901 | vp->v_flag |= VROOT; |
| 1902 | /* |
| 1903 | * Initialize modrev times |
| 1904 | */ |
| 1905 | SETHIGH(ip->i_modrev, mono_time.tv_sec); |
| 1906 | SETLOW(ip->i_modrev, mono_time.tv_usec * 4294); |
| 1907 | *vpp = vp; |
| 1908 | return (0); |
| 1909 | } |
| 1910 | |
| 1911 | /* |
| 1912 | * Allocate a new inode. |
| 1913 | */ |
| 1914 | int |
| 1915 | ufs_makeinode(mode, dvp, vpp, cnp) |
| 1916 | int mode; |
| 1917 | struct vnode *dvp; |
| 1918 | struct vnode **vpp; |
| 1919 | struct componentname *cnp; |
| 1920 | { |
| 1921 | register struct inode *ip, *pdir; |
| 1922 | struct timeval tv; |
| 1923 | struct vnode *tvp; |
| 1924 | int error; |
| 1925 | |
| 1926 | pdir = VTOI(dvp); |
| 1927 | #ifdef DIAGNOSTIC |
| 1928 | if ((cnp->cn_flags & HASBUF) == 0) |
| 1929 | panic("ufs_makeinode: no name"); |
| 1930 | #endif |
| 1931 | *vpp = NULL; |
| 1932 | if ((mode & IFMT) == 0) |
| 1933 | mode |= IFREG; |
| 1934 | |
| 1935 | if (error = VOP_VALLOC(dvp, mode, cnp->cn_cred, &tvp)) { |
| 1936 | free(cnp->cn_pnbuf, M_NAMEI); |
| 1937 | ufs_iput(pdir); |
| 1938 | return (error); |
| 1939 | } |
| 1940 | ip = VTOI(tvp); |
| 1941 | ip->i_uid = cnp->cn_cred->cr_uid; |
| 1942 | ip->i_gid = pdir->i_gid; |
| 1943 | #ifdef QUOTA |
| 1944 | if ((error = getinoquota(ip)) || |
| 1945 | (error = chkiq(ip, 1, cnp->cn_cred, 0))) { |
| 1946 | free(cnp->cn_pnbuf, M_NAMEI); |
| 1947 | VOP_VFREE(tvp, ip->i_number, mode); |
| 1948 | ufs_iput(ip); |
| 1949 | ufs_iput(pdir); |
| 1950 | return (error); |
| 1951 | } |
| 1952 | #endif |
| 1953 | ip->i_flag |= IACC|IUPD|ICHG; |
| 1954 | ip->i_mode = mode; |
| 1955 | tvp->v_type = IFTOVT(mode); /* Rest init'd in iget() */ |
| 1956 | ip->i_nlink = 1; |
| 1957 | if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred) && |
| 1958 | suser(cnp->cn_cred, NULL)) |
| 1959 | ip->i_mode &= ~ISGID; |
| 1960 | |
| 1961 | /* |
| 1962 | * Make sure inode goes to disk before directory entry. |
| 1963 | */ |
| 1964 | tv = time; |
| 1965 | if (error = VOP_UPDATE(tvp, &tv, &tv, 1)) |
| 1966 | goto bad; |
| 1967 | if (error = ufs_direnter(ip, dvp, cnp)) |
| 1968 | goto bad; |
| 1969 | if ((cnp->cn_flags & SAVESTART) == 0) |
| 1970 | FREE(cnp->cn_pnbuf, M_NAMEI); |
| 1971 | ufs_iput(pdir); |
| 1972 | *vpp = tvp; |
| 1973 | return (0); |
| 1974 | |
| 1975 | bad: |
| 1976 | /* |
| 1977 | * Write error occurred trying to update the inode |
| 1978 | * or the directory so must deallocate the inode. |
| 1979 | */ |
| 1980 | free(cnp->cn_pnbuf, M_NAMEI); |
| 1981 | ufs_iput(pdir); |
| 1982 | ip->i_nlink = 0; |
| 1983 | ip->i_flag |= ICHG; |
| 1984 | ufs_iput(ip); |
| 1985 | return (error); |
| 1986 | } |