lfs_vfsops.c revision 1.8
1 /* $NetBSD: lfs_vfsops.c,v 1.8 1995/03/09 12:06:10 mycroft Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1991, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)lfs_vfsops.c 8.10 (Berkeley) 11/21/94 36 */ 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/namei.h> 41 #include <sys/proc.h> 42 #include <sys/kernel.h> 43 #include <sys/vnode.h> 44 #include <sys/mount.h> 45 #include <sys/buf.h> 46 #include <sys/mbuf.h> 47 #include <sys/file.h> 48 #include <sys/disklabel.h> 49 #include <sys/ioctl.h> 50 #include <sys/errno.h> 51 #include <sys/malloc.h> 52 #include <sys/socket.h> 53 54 #include <miscfs/specfs/specdev.h> 55 56 #include <ufs/ufs/quota.h> 57 #include <ufs/ufs/inode.h> 58 #include <ufs/ufs/ufsmount.h> 59 #include <ufs/ufs/ufs_extern.h> 60 61 #include <ufs/lfs/lfs.h> 62 #include <ufs/lfs/lfs_extern.h> 63 64 int lfs_mountfs __P((struct vnode *, struct mount *, struct proc *)); 65 66 struct vfsops lfs_vfsops = { 67 MOUNT_LFS, 68 lfs_mount, 69 ufs_start, 70 lfs_unmount, 71 ufs_root, 72 ufs_quotactl, 73 lfs_statfs, 74 lfs_sync, 75 lfs_vget, 76 lfs_fhtovp, 77 lfs_vptofh, 78 lfs_init, 79 }; 80 81 int 82 lfs_mountroot() 83 { 84 panic("lfs_mountroot"); /* XXX -- implement */ 85 } 86 87 /* 88 * VFS Operations. 89 * 90 * mount system call 91 */ 92 lfs_mount(mp, path, data, ndp, p) 93 register struct mount *mp; 94 char *path; 95 caddr_t data; 96 struct nameidata *ndp; 97 struct proc *p; 98 { 99 struct vnode *devvp; 100 struct ufs_args args; 101 struct ufsmount *ump; 102 register struct lfs *fs; /* LFS */ 103 size_t size; 104 int error; 105 mode_t accessmode; 106 107 if (error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args))) 108 return (error); 109 110 /* Until LFS can do NFS right. XXX */ 111 if (args.export.ex_flags & MNT_EXPORTED) 112 return (EINVAL); 113 114 /* 115 * If updating, check whether changing from read-only to 116 * read/write; if there is no device name, that's all we do. 117 */ 118 if (mp->mnt_flag & MNT_UPDATE) { 119 ump = VFSTOUFS(mp); 120 if (fs->lfs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) { 121 /* 122 * If upgrade to read-write by non-root, then verify 123 * that user has necessary permissions on the device. 124 */ 125 if (p->p_ucred->cr_uid != 0) { 126 VOP_LOCK(ump->um_devvp); 127 if (error = VOP_ACCESS(ump->um_devvp, 128 VREAD | VWRITE, p->p_ucred, p)) { 129 VOP_UNLOCK(ump->um_devvp); 130 return (error); 131 } 132 VOP_UNLOCK(ump->um_devvp); 133 } 134 fs->lfs_ronly = 0; 135 } 136 if (args.fspec == 0) { 137 /* 138 * Process export requests. 139 */ 140 return (vfs_export(mp, &ump->um_export, &args.export)); 141 } 142 } 143 /* 144 * Not an update, or updating the name: look up the name 145 * and verify that it refers to a sensible block device. 146 */ 147 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 148 if (error = namei(ndp)) 149 return (error); 150 devvp = ndp->ni_vp; 151 if (devvp->v_type != VBLK) { 152 vrele(devvp); 153 return (ENOTBLK); 154 } 155 if (major(devvp->v_rdev) >= nblkdev) { 156 vrele(devvp); 157 return (ENXIO); 158 } 159 /* 160 * If mount by non-root, then verify that user has necessary 161 * permissions on the device. 162 */ 163 if (p->p_ucred->cr_uid != 0) { 164 accessmode = VREAD; 165 if ((mp->mnt_flag & MNT_RDONLY) == 0) 166 accessmode |= VWRITE; 167 VOP_LOCK(devvp); 168 if (error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p)) { 169 vput(devvp); 170 return (error); 171 } 172 VOP_UNLOCK(devvp); 173 } 174 if ((mp->mnt_flag & MNT_UPDATE) == 0) 175 error = lfs_mountfs(devvp, mp, p); /* LFS */ 176 else { 177 if (devvp != ump->um_devvp) 178 error = EINVAL; /* needs translation */ 179 else 180 vrele(devvp); 181 } 182 if (error) { 183 vrele(devvp); 184 return (error); 185 } 186 ump = VFSTOUFS(mp); 187 fs = ump->um_lfs; /* LFS */ 188 #ifdef NOTLFS /* LFS */ 189 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size); 190 bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size); 191 bcopy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN); 192 #else 193 (void)copyinstr(path, fs->lfs_fsmnt, sizeof(fs->lfs_fsmnt) - 1, &size); 194 bzero(fs->lfs_fsmnt + size, sizeof(fs->lfs_fsmnt) - size); 195 bcopy(fs->lfs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN); 196 #endif 197 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 198 &size); 199 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 200 return (0); 201 } 202 203 /* 204 * Common code for mount and mountroot 205 * LFS specific 206 */ 207 int 208 lfs_mountfs(devvp, mp, p) 209 register struct vnode *devvp; 210 struct mount *mp; 211 struct proc *p; 212 { 213 extern struct vnode *rootvp; 214 register struct lfs *fs; 215 register struct ufsmount *ump; 216 struct vnode *vp; 217 struct buf *bp; 218 struct partinfo dpart; 219 dev_t dev; 220 int error, i, ronly, size; 221 struct ucred *cred; 222 223 cred = p ? p->p_ucred : NOCRED; 224 /* 225 * Disallow multiple mounts of the same device. 226 * Disallow mounting of a device that is currently in use 227 * (except for root, which might share swap device for miniroot). 228 * Flush out any old buffers remaining from a previous use. 229 */ 230 if (error = vfs_mountedon(devvp)) 231 return (error); 232 if (vcount(devvp) > 1 && devvp != rootvp) 233 return (EBUSY); 234 if (error = vinvalbuf(devvp, V_SAVE, cred, p, 0, 0)) 235 return (error); 236 237 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 238 if (error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p)) 239 return (error); 240 241 if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, cred, p) != 0) 242 size = DEV_BSIZE; 243 else { 244 size = dpart.disklab->d_secsize; 245 #ifdef NEVER_USED 246 dpart.part->p_fstype = FS_LFS; 247 dpart.part->p_fsize = fs->lfs_fsize; /* frag size */ 248 dpart.part->p_frag = fs->lfs_frag; /* frags per block */ 249 dpart.part->p_cpg = fs->lfs_segshift; /* segment shift */ 250 #endif 251 } 252 253 /* Don't free random space on error. */ 254 bp = NULL; 255 ump = NULL; 256 257 /* Read in the superblock. */ 258 if (error = bread(devvp, LFS_LABELPAD / size, LFS_SBPAD, cred, &bp)) 259 goto out; 260 fs = (struct lfs *)bp->b_data; 261 262 /* Check the basics. */ 263 if (fs->lfs_magic != LFS_MAGIC || fs->lfs_bsize > MAXBSIZE || 264 fs->lfs_bsize < sizeof(struct lfs)) { 265 error = EINVAL; /* XXX needs translation */ 266 goto out; 267 } 268 269 /* Allocate the mount structure, copy the superblock into it. */ 270 ump = (struct ufsmount *)malloc(sizeof *ump, M_UFSMNT, M_WAITOK); 271 fs = ump->um_lfs = malloc(sizeof(struct lfs), M_UFSMNT, M_WAITOK); 272 bcopy(bp->b_data, fs, sizeof(struct lfs)); 273 if (sizeof(struct lfs) < LFS_SBPAD) /* XXX why? */ 274 bp->b_flags |= B_INVAL; 275 brelse(bp); 276 bp = NULL; 277 278 /* Set up the I/O information */ 279 fs->lfs_iocount = 0; 280 281 /* Set up the ifile and lock aflags */ 282 fs->lfs_doifile = 0; 283 fs->lfs_writer = 0; 284 fs->lfs_dirops = 0; 285 fs->lfs_seglock = 0; 286 287 /* Set the file system readonly/modify bits. */ 288 fs->lfs_ronly = ronly; 289 if (ronly == 0) 290 fs->lfs_fmod = 1; 291 292 /* Initialize the mount structure. */ 293 dev = devvp->v_rdev; 294 mp->mnt_data = (qaddr_t)ump; 295 mp->mnt_stat.f_fsid.val[0] = (long)dev; 296 mp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_LFS); 297 mp->mnt_maxsymlinklen = fs->lfs_maxsymlinklen; 298 mp->mnt_flag |= MNT_LOCAL; 299 ump->um_mountp = mp; 300 ump->um_dev = dev; 301 ump->um_devvp = devvp; 302 ump->um_bptrtodb = 0; 303 ump->um_seqinc = 1 << fs->lfs_fsbtodb; 304 ump->um_nindir = fs->lfs_nindir; 305 for (i = 0; i < MAXQUOTAS; i++) 306 ump->um_quotas[i] = NULLVP; 307 devvp->v_specflags |= SI_MOUNTEDON; 308 309 /* 310 * We use the ifile vnode for almost every operation. Instead of 311 * retrieving it from the hash table each time we retrieve it here, 312 * artificially increment the reference count and keep a pointer 313 * to it in the incore copy of the superblock. 314 */ 315 if (error = VFS_VGET(mp, LFS_IFILE_INUM, &vp)) 316 goto out; 317 fs->lfs_ivnode = vp; 318 VREF(vp); 319 vput(vp); 320 321 return (0); 322 out: 323 if (bp) 324 brelse(bp); 325 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, cred, p); 326 if (ump) { 327 free(ump->um_lfs, M_UFSMNT); 328 free(ump, M_UFSMNT); 329 mp->mnt_data = (qaddr_t)0; 330 } 331 return (error); 332 } 333 334 /* 335 * unmount system call 336 */ 337 lfs_unmount(mp, mntflags, p) 338 struct mount *mp; 339 int mntflags; 340 struct proc *p; 341 { 342 extern int doforce; 343 register struct ufsmount *ump; 344 register struct lfs *fs; 345 int i, error, flags, ronly; 346 347 flags = 0; 348 if (mntflags & MNT_FORCE) 349 flags |= FORCECLOSE; 350 351 ump = VFSTOUFS(mp); 352 fs = ump->um_lfs; 353 #ifdef QUOTA 354 if (mp->mnt_flag & MNT_QUOTA) { 355 if (error = vflush(mp, fs->lfs_ivnode, SKIPSYSTEM|flags)) 356 return (error); 357 for (i = 0; i < MAXQUOTAS; i++) { 358 if (ump->um_quotas[i] == NULLVP) 359 continue; 360 quotaoff(p, mp, i); 361 } 362 /* 363 * Here we fall through to vflush again to ensure 364 * that we have gotten rid of all the system vnodes. 365 */ 366 } 367 #endif 368 if (error = vflush(mp, fs->lfs_ivnode, flags)) 369 return (error); 370 fs->lfs_clean = 1; 371 if (error = VFS_SYNC(mp, 1, p->p_ucred, p)) 372 return (error); 373 if (fs->lfs_ivnode->v_dirtyblkhd.lh_first) 374 panic("lfs_unmount: still dirty blocks on ifile vnode\n"); 375 vrele(fs->lfs_ivnode); 376 vgone(fs->lfs_ivnode); 377 378 ronly = !fs->lfs_ronly; 379 ump->um_devvp->v_specflags &= ~SI_MOUNTEDON; 380 error = VOP_CLOSE(ump->um_devvp, 381 ronly ? FREAD : FREAD|FWRITE, NOCRED, p); 382 vrele(ump->um_devvp); 383 free(fs, M_UFSMNT); 384 free(ump, M_UFSMNT); 385 mp->mnt_data = (qaddr_t)0; 386 mp->mnt_flag &= ~MNT_LOCAL; 387 return (error); 388 } 389 390 /* 391 * Get file system statistics. 392 */ 393 lfs_statfs(mp, sbp, p) 394 struct mount *mp; 395 register struct statfs *sbp; 396 struct proc *p; 397 { 398 register struct lfs *fs; 399 register struct ufsmount *ump; 400 401 ump = VFSTOUFS(mp); 402 fs = ump->um_lfs; 403 if (fs->lfs_magic != LFS_MAGIC) 404 panic("lfs_statfs: magic"); 405 sbp->f_type = 0; 406 sbp->f_bsize = fs->lfs_bsize; 407 sbp->f_iosize = fs->lfs_bsize; 408 sbp->f_blocks = dbtofsb(fs,fs->lfs_dsize); 409 sbp->f_bfree = dbtofsb(fs, fs->lfs_bfree); 410 sbp->f_bavail = (fs->lfs_dsize * (100 - fs->lfs_minfree) / 100) - 411 (fs->lfs_dsize - fs->lfs_bfree); 412 sbp->f_bavail = dbtofsb(fs, sbp->f_bavail); 413 sbp->f_files = fs->lfs_nfiles; 414 sbp->f_ffree = sbp->f_bfree * INOPB(fs); 415 if (sbp != &mp->mnt_stat) { 416 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 417 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 418 } 419 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 420 sbp->f_fstypename[MFSNAMELEN] = '\0'; 421 return (0); 422 } 423 424 /* 425 * Go through the disk queues to initiate sandbagged IO; 426 * go through the inodes to write those that have been modified; 427 * initiate the writing of the super block if it has been modified. 428 * 429 * Note: we are always called with the filesystem marked `MPBUSY'. 430 */ 431 lfs_sync(mp, waitfor, cred, p) 432 struct mount *mp; 433 int waitfor; 434 struct ucred *cred; 435 struct proc *p; 436 { 437 int error; 438 439 /* All syncs must be checkpoints until roll-forward is implemented. */ 440 error = lfs_segwrite(mp, SEGM_CKP | (waitfor ? SEGM_SYNC : 0)); 441 #ifdef QUOTA 442 qsync(mp); 443 #endif 444 return (error); 445 } 446 447 /* 448 * Look up an LFS dinode number to find its incore vnode. If not already 449 * in core, read it in from the specified device. Return the inode locked. 450 * Detection and handling of mount points must be done by the calling routine. 451 */ 452 int 453 lfs_vget(mp, ino, vpp) 454 struct mount *mp; 455 ino_t ino; 456 struct vnode **vpp; 457 { 458 register struct lfs *fs; 459 register struct inode *ip; 460 struct buf *bp; 461 struct ifile *ifp; 462 struct vnode *vp; 463 struct ufsmount *ump; 464 daddr_t daddr; 465 dev_t dev; 466 int error; 467 468 ump = VFSTOUFS(mp); 469 dev = ump->um_dev; 470 if ((*vpp = ufs_ihashget(dev, ino)) != NULL) 471 return (0); 472 473 /* Translate the inode number to a disk address. */ 474 fs = ump->um_lfs; 475 if (ino == LFS_IFILE_INUM) 476 daddr = fs->lfs_idaddr; 477 else { 478 LFS_IENTRY(ifp, fs, ino, bp); 479 daddr = ifp->if_daddr; 480 brelse(bp); 481 if (daddr == LFS_UNUSED_DADDR) 482 return (ENOENT); 483 } 484 485 /* Allocate new vnode/inode. */ 486 if (error = lfs_vcreate(mp, ino, &vp)) { 487 *vpp = NULL; 488 return (error); 489 } 490 491 /* 492 * Put it onto its hash chain and lock it so that other requests for 493 * this inode will block if they arrive while we are sleeping waiting 494 * for old data structures to be purged or for the contents of the 495 * disk portion of this inode to be read. 496 */ 497 ip = VTOI(vp); 498 ufs_ihashins(ip); 499 500 /* 501 * XXX 502 * This may not need to be here, logically it should go down with 503 * the i_devvp initialization. 504 * Ask Kirk. 505 */ 506 ip->i_lfs = ump->um_lfs; 507 508 /* Read in the disk contents for the inode, copy into the inode. */ 509 if (error = 510 bread(ump->um_devvp, daddr, (int)fs->lfs_bsize, NOCRED, &bp)) { 511 /* 512 * The inode does not contain anything useful, so it would 513 * be misleading to leave it on its hash chain. With mode 514 * still zero, it will be unlinked and returned to the free 515 * list by vput(). 516 */ 517 vput(vp); 518 brelse(bp); 519 *vpp = NULL; 520 return (error); 521 } 522 ip->i_din = *lfs_ifind(fs, ino, (struct dinode *)bp->b_data); 523 brelse(bp); 524 525 /* 526 * Initialize the vnode from the inode, check for aliases. In all 527 * cases re-init ip, the underlying vnode/inode may have changed. 528 */ 529 if (error = ufs_vinit(mp, lfs_specop_p, LFS_FIFOOPS, &vp)) { 530 vput(vp); 531 *vpp = NULL; 532 return (error); 533 } 534 /* 535 * Finish inode initialization now that aliasing has been resolved. 536 */ 537 ip->i_devvp = ump->um_devvp; 538 VREF(ip->i_devvp); 539 *vpp = vp; 540 return (0); 541 } 542 543 /* 544 * File handle to vnode 545 * 546 * Have to be really careful about stale file handles: 547 * - check that the inode number is valid 548 * - call lfs_vget() to get the locked inode 549 * - check for an unallocated inode (i_mode == 0) 550 * - check that the given client host has export rights and return 551 * those rights via. exflagsp and credanonp 552 * 553 * XXX 554 * use ifile to see if inode is allocated instead of reading off disk 555 * what is the relationship between my generational number and the NFS 556 * generational number. 557 */ 558 int 559 lfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 560 register struct mount *mp; 561 struct fid *fhp; 562 struct mbuf *nam; 563 struct vnode **vpp; 564 int *exflagsp; 565 struct ucred **credanonp; 566 { 567 register struct ufid *ufhp; 568 569 ufhp = (struct ufid *)fhp; 570 if (ufhp->ufid_ino < ROOTINO) 571 return (ESTALE); 572 return (ufs_check_export(mp, ufhp, nam, vpp, exflagsp, credanonp)); 573 } 574 575 /* 576 * Vnode pointer to File handle 577 */ 578 /* ARGSUSED */ 579 lfs_vptofh(vp, fhp) 580 struct vnode *vp; 581 struct fid *fhp; 582 { 583 register struct inode *ip; 584 register struct ufid *ufhp; 585 586 ip = VTOI(vp); 587 ufhp = (struct ufid *)fhp; 588 ufhp->ufid_len = sizeof(struct ufid); 589 ufhp->ufid_ino = ip->i_number; 590 ufhp->ufid_gen = ip->i_gen; 591 return (0); 592 } 593
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