lfs_vfsops.c revision 1.10
1 /* $NetBSD: lfs_vfsops.c,v 1.10 1996/02/09 22:28:58 christos 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 return 0; 86 } 87 88 /* 89 * VFS Operations. 90 * 91 * mount system call 92 */ 93 int 94 lfs_mount(mp, path, data, ndp, p) 95 register struct mount *mp; 96 char *path; 97 caddr_t data; 98 struct nameidata *ndp; 99 struct proc *p; 100 { 101 struct vnode *devvp; 102 struct ufs_args args; 103 struct ufsmount *ump = NULL; 104 register struct lfs *fs = NULL; /* LFS */ 105 size_t size; 106 int error; 107 mode_t accessmode; 108 109 error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args)); 110 if (error) 111 return (error); 112 113 /* Until LFS can do NFS right. XXX */ 114 if (args.export.ex_flags & MNT_EXPORTED) 115 return (EINVAL); 116 117 /* 118 * If updating, check whether changing from read-only to 119 * read/write; if there is no device name, that's all we do. 120 */ 121 if (mp->mnt_flag & MNT_UPDATE) { 122 ump = VFSTOUFS(mp); 123 if (fs->lfs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) { 124 /* 125 * If upgrade to read-write by non-root, then verify 126 * that user has necessary permissions on the device. 127 */ 128 if (p->p_ucred->cr_uid != 0) { 129 VOP_LOCK(ump->um_devvp); 130 error = VOP_ACCESS(ump->um_devvp, VREAD|VWRITE, 131 p->p_ucred, p); 132 if (error) { 133 VOP_UNLOCK(ump->um_devvp); 134 return (error); 135 } 136 VOP_UNLOCK(ump->um_devvp); 137 } 138 fs->lfs_ronly = 0; 139 } 140 if (args.fspec == 0) { 141 /* 142 * Process export requests. 143 */ 144 return (vfs_export(mp, &ump->um_export, &args.export)); 145 } 146 } 147 /* 148 * Not an update, or updating the name: look up the name 149 * and verify that it refers to a sensible block device. 150 */ 151 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 152 if ((error = namei(ndp)) != 0) 153 return (error); 154 devvp = ndp->ni_vp; 155 if (devvp->v_type != VBLK) { 156 vrele(devvp); 157 return (ENOTBLK); 158 } 159 if (major(devvp->v_rdev) >= nblkdev) { 160 vrele(devvp); 161 return (ENXIO); 162 } 163 /* 164 * If mount by non-root, then verify that user has necessary 165 * permissions on the device. 166 */ 167 if (p->p_ucred->cr_uid != 0) { 168 accessmode = VREAD; 169 if ((mp->mnt_flag & MNT_RDONLY) == 0) 170 accessmode |= VWRITE; 171 VOP_LOCK(devvp); 172 error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p); 173 if (error) { 174 vput(devvp); 175 return (error); 176 } 177 VOP_UNLOCK(devvp); 178 } 179 if ((mp->mnt_flag & MNT_UPDATE) == 0) 180 error = lfs_mountfs(devvp, mp, p); /* LFS */ 181 else { 182 if (devvp != ump->um_devvp) 183 error = EINVAL; /* needs translation */ 184 else 185 vrele(devvp); 186 } 187 if (error) { 188 vrele(devvp); 189 return (error); 190 } 191 ump = VFSTOUFS(mp); 192 fs = ump->um_lfs; /* LFS */ 193 #ifdef NOTLFS /* LFS */ 194 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size); 195 bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size); 196 bcopy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN); 197 #else 198 (void)copyinstr(path, fs->lfs_fsmnt, sizeof(fs->lfs_fsmnt) - 1, &size); 199 bzero(fs->lfs_fsmnt + size, sizeof(fs->lfs_fsmnt) - size); 200 bcopy(fs->lfs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN); 201 #endif 202 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 203 &size); 204 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 205 return (0); 206 } 207 208 /* 209 * Common code for mount and mountroot 210 * LFS specific 211 */ 212 int 213 lfs_mountfs(devvp, mp, p) 214 register struct vnode *devvp; 215 struct mount *mp; 216 struct proc *p; 217 { 218 extern struct vnode *rootvp; 219 register struct lfs *fs; 220 register struct ufsmount *ump; 221 struct vnode *vp; 222 struct buf *bp; 223 struct partinfo dpart; 224 dev_t dev; 225 int error, i, ronly, size; 226 struct ucred *cred; 227 228 cred = p ? p->p_ucred : NOCRED; 229 /* 230 * Disallow multiple mounts of the same device. 231 * Disallow mounting of a device that is currently in use 232 * (except for root, which might share swap device for miniroot). 233 * Flush out any old buffers remaining from a previous use. 234 */ 235 if ((error = vfs_mountedon(devvp)) != 0) 236 return (error); 237 if (vcount(devvp) > 1 && devvp != rootvp) 238 return (EBUSY); 239 if ((error = vinvalbuf(devvp, V_SAVE, cred, p, 0, 0)) != 0) 240 return (error); 241 242 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 243 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p); 244 if (error) 245 return (error); 246 247 if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, cred, p) != 0) 248 size = DEV_BSIZE; 249 else { 250 size = dpart.disklab->d_secsize; 251 #ifdef NEVER_USED 252 dpart.part->p_fstype = FS_LFS; 253 dpart.part->p_fsize = fs->lfs_fsize; /* frag size */ 254 dpart.part->p_frag = fs->lfs_frag; /* frags per block */ 255 dpart.part->p_cpg = fs->lfs_segshift; /* segment shift */ 256 #endif 257 } 258 259 /* Don't free random space on error. */ 260 bp = NULL; 261 ump = NULL; 262 263 /* Read in the superblock. */ 264 error = bread(devvp, LFS_LABELPAD / size, LFS_SBPAD, cred, &bp); 265 if (error) 266 goto out; 267 fs = (struct lfs *)bp->b_data; 268 269 /* Check the basics. */ 270 if (fs->lfs_magic != LFS_MAGIC || fs->lfs_bsize > MAXBSIZE || 271 fs->lfs_bsize < sizeof(struct lfs)) { 272 error = EINVAL; /* XXX needs translation */ 273 goto out; 274 } 275 276 /* Allocate the mount structure, copy the superblock into it. */ 277 ump = (struct ufsmount *)malloc(sizeof *ump, M_UFSMNT, M_WAITOK); 278 fs = ump->um_lfs = malloc(sizeof(struct lfs), M_UFSMNT, M_WAITOK); 279 bcopy(bp->b_data, fs, sizeof(struct lfs)); 280 if (sizeof(struct lfs) < LFS_SBPAD) /* XXX why? */ 281 bp->b_flags |= B_INVAL; 282 brelse(bp); 283 bp = NULL; 284 285 /* Set up the I/O information */ 286 fs->lfs_iocount = 0; 287 288 /* Set up the ifile and lock aflags */ 289 fs->lfs_doifile = 0; 290 fs->lfs_writer = 0; 291 fs->lfs_dirops = 0; 292 fs->lfs_seglock = 0; 293 294 /* Set the file system readonly/modify bits. */ 295 fs->lfs_ronly = ronly; 296 if (ronly == 0) 297 fs->lfs_fmod = 1; 298 299 /* Initialize the mount structure. */ 300 dev = devvp->v_rdev; 301 mp->mnt_data = (qaddr_t)ump; 302 mp->mnt_stat.f_fsid.val[0] = (long)dev; 303 mp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_LFS); 304 mp->mnt_maxsymlinklen = fs->lfs_maxsymlinklen; 305 mp->mnt_flag |= MNT_LOCAL; 306 ump->um_mountp = mp; 307 ump->um_dev = dev; 308 ump->um_devvp = devvp; 309 ump->um_bptrtodb = 0; 310 ump->um_seqinc = 1 << fs->lfs_fsbtodb; 311 ump->um_nindir = fs->lfs_nindir; 312 for (i = 0; i < MAXQUOTAS; i++) 313 ump->um_quotas[i] = NULLVP; 314 devvp->v_specflags |= SI_MOUNTEDON; 315 316 /* 317 * We use the ifile vnode for almost every operation. Instead of 318 * retrieving it from the hash table each time we retrieve it here, 319 * artificially increment the reference count and keep a pointer 320 * to it in the incore copy of the superblock. 321 */ 322 if ((error = VFS_VGET(mp, LFS_IFILE_INUM, &vp)) != 0) 323 goto out; 324 fs->lfs_ivnode = vp; 325 VREF(vp); 326 vput(vp); 327 328 return (0); 329 out: 330 if (bp) 331 brelse(bp); 332 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, cred, p); 333 if (ump) { 334 free(ump->um_lfs, M_UFSMNT); 335 free(ump, M_UFSMNT); 336 mp->mnt_data = (qaddr_t)0; 337 } 338 return (error); 339 } 340 341 /* 342 * unmount system call 343 */ 344 int 345 lfs_unmount(mp, mntflags, p) 346 struct mount *mp; 347 int mntflags; 348 struct proc *p; 349 { 350 register struct ufsmount *ump; 351 register struct lfs *fs; 352 int i, error, flags, ronly; 353 354 flags = 0; 355 if (mntflags & MNT_FORCE) 356 flags |= FORCECLOSE; 357 358 ump = VFSTOUFS(mp); 359 fs = ump->um_lfs; 360 #ifdef QUOTA 361 if (mp->mnt_flag & MNT_QUOTA) { 362 error = vflush(mp, fs->lfs_ivnode, SKIPSYSTEM|flags); 363 if (error) 364 return (error); 365 for (i = 0; i < MAXQUOTAS; i++) { 366 if (ump->um_quotas[i] == NULLVP) 367 continue; 368 quotaoff(p, mp, i); 369 } 370 /* 371 * Here we fall through to vflush again to ensure 372 * that we have gotten rid of all the system vnodes. 373 */ 374 } 375 #endif 376 if ((error = vflush(mp, fs->lfs_ivnode, flags)) != 0) 377 return (error); 378 fs->lfs_clean = 1; 379 if ((error = VFS_SYNC(mp, 1, p->p_ucred, p)) != 0) 380 return (error); 381 if (fs->lfs_ivnode->v_dirtyblkhd.lh_first) 382 panic("lfs_unmount: still dirty blocks on ifile vnode\n"); 383 vrele(fs->lfs_ivnode); 384 vgone(fs->lfs_ivnode); 385 386 ronly = !fs->lfs_ronly; 387 ump->um_devvp->v_specflags &= ~SI_MOUNTEDON; 388 error = VOP_CLOSE(ump->um_devvp, 389 ronly ? FREAD : FREAD|FWRITE, NOCRED, p); 390 vrele(ump->um_devvp); 391 free(fs, M_UFSMNT); 392 free(ump, M_UFSMNT); 393 mp->mnt_data = (qaddr_t)0; 394 mp->mnt_flag &= ~MNT_LOCAL; 395 return (error); 396 } 397 398 /* 399 * Get file system statistics. 400 */ 401 int 402 lfs_statfs(mp, sbp, p) 403 struct mount *mp; 404 register struct statfs *sbp; 405 struct proc *p; 406 { 407 register struct lfs *fs; 408 register struct ufsmount *ump; 409 410 ump = VFSTOUFS(mp); 411 fs = ump->um_lfs; 412 if (fs->lfs_magic != LFS_MAGIC) 413 panic("lfs_statfs: magic"); 414 sbp->f_type = 0; 415 sbp->f_bsize = fs->lfs_bsize; 416 sbp->f_iosize = fs->lfs_bsize; 417 sbp->f_blocks = dbtofsb(fs,fs->lfs_dsize); 418 sbp->f_bfree = dbtofsb(fs, fs->lfs_bfree); 419 sbp->f_bavail = (fs->lfs_dsize * (100 - fs->lfs_minfree) / 100) - 420 (fs->lfs_dsize - fs->lfs_bfree); 421 sbp->f_bavail = dbtofsb(fs, sbp->f_bavail); 422 sbp->f_files = fs->lfs_nfiles; 423 sbp->f_ffree = sbp->f_bfree * INOPB(fs); 424 if (sbp != &mp->mnt_stat) { 425 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 426 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 427 } 428 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 429 return (0); 430 } 431 432 /* 433 * Go through the disk queues to initiate sandbagged IO; 434 * go through the inodes to write those that have been modified; 435 * initiate the writing of the super block if it has been modified. 436 * 437 * Note: we are always called with the filesystem marked `MPBUSY'. 438 */ 439 int 440 lfs_sync(mp, waitfor, cred, p) 441 struct mount *mp; 442 int waitfor; 443 struct ucred *cred; 444 struct proc *p; 445 { 446 int error; 447 448 /* All syncs must be checkpoints until roll-forward is implemented. */ 449 error = lfs_segwrite(mp, SEGM_CKP | (waitfor ? SEGM_SYNC : 0)); 450 #ifdef QUOTA 451 qsync(mp); 452 #endif 453 return (error); 454 } 455 456 /* 457 * Look up an LFS dinode number to find its incore vnode. If not already 458 * in core, read it in from the specified device. Return the inode locked. 459 * Detection and handling of mount points must be done by the calling routine. 460 */ 461 int 462 lfs_vget(mp, ino, vpp) 463 struct mount *mp; 464 ino_t ino; 465 struct vnode **vpp; 466 { 467 register struct lfs *fs; 468 register struct inode *ip; 469 struct buf *bp; 470 struct ifile *ifp; 471 struct vnode *vp; 472 struct ufsmount *ump; 473 daddr_t daddr; 474 dev_t dev; 475 int error; 476 477 ump = VFSTOUFS(mp); 478 dev = ump->um_dev; 479 if ((*vpp = ufs_ihashget(dev, ino)) != NULL) 480 return (0); 481 482 /* Translate the inode number to a disk address. */ 483 fs = ump->um_lfs; 484 if (ino == LFS_IFILE_INUM) 485 daddr = fs->lfs_idaddr; 486 else { 487 LFS_IENTRY(ifp, fs, ino, bp); 488 daddr = ifp->if_daddr; 489 brelse(bp); 490 if (daddr == LFS_UNUSED_DADDR) 491 return (ENOENT); 492 } 493 494 /* Allocate new vnode/inode. */ 495 if ((error = lfs_vcreate(mp, ino, &vp)) != 0) { 496 *vpp = NULL; 497 return (error); 498 } 499 500 /* 501 * Put it onto its hash chain and lock it so that other requests for 502 * this inode will block if they arrive while we are sleeping waiting 503 * for old data structures to be purged or for the contents of the 504 * disk portion of this inode to be read. 505 */ 506 ip = VTOI(vp); 507 ufs_ihashins(ip); 508 509 /* 510 * XXX 511 * This may not need to be here, logically it should go down with 512 * the i_devvp initialization. 513 * Ask Kirk. 514 */ 515 ip->i_lfs = ump->um_lfs; 516 517 /* Read in the disk contents for the inode, copy into the inode. */ 518 error = bread(ump->um_devvp, daddr, (int)fs->lfs_bsize, NOCRED, &bp); 519 if (error) { 520 /* 521 * The inode does not contain anything useful, so it would 522 * be misleading to leave it on its hash chain. With mode 523 * still zero, it will be unlinked and returned to the free 524 * list by vput(). 525 */ 526 vput(vp); 527 brelse(bp); 528 *vpp = NULL; 529 return (error); 530 } 531 ip->i_din = *lfs_ifind(fs, ino, (struct dinode *)bp->b_data); 532 brelse(bp); 533 534 /* 535 * Initialize the vnode from the inode, check for aliases. In all 536 * cases re-init ip, the underlying vnode/inode may have changed. 537 */ 538 error = ufs_vinit(mp, lfs_specop_p, LFS_FIFOOPS, &vp); 539 if (error) { 540 vput(vp); 541 *vpp = NULL; 542 return (error); 543 } 544 /* 545 * Finish inode initialization now that aliasing has been resolved. 546 */ 547 ip->i_devvp = ump->um_devvp; 548 VREF(ip->i_devvp); 549 *vpp = vp; 550 return (0); 551 } 552 553 /* 554 * File handle to vnode 555 * 556 * Have to be really careful about stale file handles: 557 * - check that the inode number is valid 558 * - call lfs_vget() to get the locked inode 559 * - check for an unallocated inode (i_mode == 0) 560 * - check that the given client host has export rights and return 561 * those rights via. exflagsp and credanonp 562 * 563 * XXX 564 * use ifile to see if inode is allocated instead of reading off disk 565 * what is the relationship between my generational number and the NFS 566 * generational number. 567 */ 568 int 569 lfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 570 register struct mount *mp; 571 struct fid *fhp; 572 struct mbuf *nam; 573 struct vnode **vpp; 574 int *exflagsp; 575 struct ucred **credanonp; 576 { 577 register struct ufid *ufhp; 578 579 ufhp = (struct ufid *)fhp; 580 if (ufhp->ufid_ino < ROOTINO) 581 return (ESTALE); 582 return (ufs_check_export(mp, ufhp, nam, vpp, exflagsp, credanonp)); 583 } 584 585 /* 586 * Vnode pointer to File handle 587 */ 588 /* ARGSUSED */ 589 int 590 lfs_vptofh(vp, fhp) 591 struct vnode *vp; 592 struct fid *fhp; 593 { 594 register struct inode *ip; 595 register struct ufid *ufhp; 596 597 ip = VTOI(vp); 598 ufhp = (struct ufid *)fhp; 599 ufhp->ufid_len = sizeof(struct ufid); 600 ufhp->ufid_ino = ip->i_number; 601 ufhp->ufid_gen = ip->i_gen; 602 return (0); 603 } 604
Indexes created Sat Sep 27 14:09:57 GMT 2025