lfs_vfsops.c revision 1.13
1 /* $NetBSD: lfs_vfsops.c,v 1.13 1997/06/11 10:10:04 bouyer 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 const char *path; 97 void *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 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 int i; 363 error = vflush(mp, fs->lfs_ivnode, SKIPSYSTEM|flags); 364 if (error) 365 return (error); 366 for (i = 0; i < MAXQUOTAS; i++) { 367 if (ump->um_quotas[i] == NULLVP) 368 continue; 369 quotaoff(p, mp, i); 370 } 371 /* 372 * Here we fall through to vflush again to ensure 373 * that we have gotten rid of all the system vnodes. 374 */ 375 } 376 #endif 377 if ((error = vflush(mp, fs->lfs_ivnode, flags)) != 0) 378 return (error); 379 fs->lfs_clean = 1; 380 if ((error = VFS_SYNC(mp, 1, p->p_ucred, p)) != 0) 381 return (error); 382 if (fs->lfs_ivnode->v_dirtyblkhd.lh_first) 383 panic("lfs_unmount: still dirty blocks on ifile vnode\n"); 384 vrele(fs->lfs_ivnode); 385 vgone(fs->lfs_ivnode); 386 387 ronly = !fs->lfs_ronly; 388 ump->um_devvp->v_specflags &= ~SI_MOUNTEDON; 389 error = VOP_CLOSE(ump->um_devvp, 390 ronly ? FREAD : FREAD|FWRITE, NOCRED, p); 391 vrele(ump->um_devvp); 392 free(fs, M_UFSMNT); 393 free(ump, M_UFSMNT); 394 mp->mnt_data = (qaddr_t)0; 395 mp->mnt_flag &= ~MNT_LOCAL; 396 return (error); 397 } 398 399 /* 400 * Get file system statistics. 401 */ 402 int 403 lfs_statfs(mp, sbp, p) 404 struct mount *mp; 405 register struct statfs *sbp; 406 struct proc *p; 407 { 408 register struct lfs *fs; 409 register struct ufsmount *ump; 410 411 ump = VFSTOUFS(mp); 412 fs = ump->um_lfs; 413 if (fs->lfs_magic != LFS_MAGIC) 414 panic("lfs_statfs: magic"); 415 sbp->f_type = 0; 416 sbp->f_bsize = fs->lfs_bsize; 417 sbp->f_iosize = fs->lfs_bsize; 418 sbp->f_blocks = dbtofsb(fs,fs->lfs_dsize); 419 sbp->f_bfree = dbtofsb(fs, fs->lfs_bfree); 420 sbp->f_bavail = (fs->lfs_dsize * (100 - fs->lfs_minfree) / 100) - 421 (fs->lfs_dsize - fs->lfs_bfree); 422 sbp->f_bavail = dbtofsb(fs, sbp->f_bavail); 423 sbp->f_files = fs->lfs_nfiles; 424 sbp->f_ffree = sbp->f_bfree * INOPB(fs); 425 if (sbp != &mp->mnt_stat) { 426 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 427 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 428 } 429 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 430 return (0); 431 } 432 433 /* 434 * Go through the disk queues to initiate sandbagged IO; 435 * go through the inodes to write those that have been modified; 436 * initiate the writing of the super block if it has been modified. 437 * 438 * Note: we are always called with the filesystem marked `MPBUSY'. 439 */ 440 int 441 lfs_sync(mp, waitfor, cred, p) 442 struct mount *mp; 443 int waitfor; 444 struct ucred *cred; 445 struct proc *p; 446 { 447 int error; 448 449 /* All syncs must be checkpoints until roll-forward is implemented. */ 450 error = lfs_segwrite(mp, SEGM_CKP | (waitfor ? SEGM_SYNC : 0)); 451 #ifdef QUOTA 452 qsync(mp); 453 #endif 454 return (error); 455 } 456 457 /* 458 * Look up an LFS dinode number to find its incore vnode. If not already 459 * in core, read it in from the specified device. Return the inode locked. 460 * Detection and handling of mount points must be done by the calling routine. 461 */ 462 int 463 lfs_vget(mp, ino, vpp) 464 struct mount *mp; 465 ino_t ino; 466 struct vnode **vpp; 467 { 468 register struct lfs *fs; 469 register struct inode *ip; 470 struct buf *bp; 471 struct ifile *ifp; 472 struct vnode *vp; 473 struct ufsmount *ump; 474 daddr_t daddr; 475 dev_t dev; 476 int error; 477 478 ump = VFSTOUFS(mp); 479 dev = ump->um_dev; 480 if ((*vpp = ufs_ihashget(dev, ino)) != NULL) 481 return (0); 482 483 /* Translate the inode number to a disk address. */ 484 fs = ump->um_lfs; 485 if (ino == LFS_IFILE_INUM) 486 daddr = fs->lfs_idaddr; 487 else { 488 LFS_IENTRY(ifp, fs, ino, bp); 489 daddr = ifp->if_daddr; 490 brelse(bp); 491 if (daddr == LFS_UNUSED_DADDR) 492 return (ENOENT); 493 } 494 495 /* Allocate new vnode/inode. */ 496 if ((error = lfs_vcreate(mp, ino, &vp)) != 0) { 497 *vpp = NULL; 498 return (error); 499 } 500 501 /* 502 * Put it onto its hash chain and lock it so that other requests for 503 * this inode will block if they arrive while we are sleeping waiting 504 * for old data structures to be purged or for the contents of the 505 * disk portion of this inode to be read. 506 */ 507 ip = VTOI(vp); 508 ufs_ihashins(ip); 509 510 /* 511 * XXX 512 * This may not need to be here, logically it should go down with 513 * the i_devvp initialization. 514 * Ask Kirk. 515 */ 516 ip->i_lfs = ump->um_lfs; 517 518 /* Read in the disk contents for the inode, copy into the inode. */ 519 error = bread(ump->um_devvp, daddr, (int)fs->lfs_bsize, NOCRED, &bp); 520 if (error) { 521 /* 522 * The inode does not contain anything useful, so it would 523 * be misleading to leave it on its hash chain. With mode 524 * still zero, it will be unlinked and returned to the free 525 * list by vput(). 526 */ 527 vput(vp); 528 brelse(bp); 529 *vpp = NULL; 530 return (error); 531 } 532 ip->i_din.ffs_din = *lfs_ifind(fs, ino, (struct dinode *)bp->b_data); 533 brelse(bp); 534 535 /* 536 * Initialize the vnode from the inode, check for aliases. In all 537 * cases re-init ip, the underlying vnode/inode may have changed. 538 */ 539 error = ufs_vinit(mp, lfs_specop_p, LFS_FIFOOPS, &vp); 540 if (error) { 541 vput(vp); 542 *vpp = NULL; 543 return (error); 544 } 545 /* 546 * Finish inode initialization now that aliasing has been resolved. 547 */ 548 ip->i_devvp = ump->um_devvp; 549 VREF(ip->i_devvp); 550 *vpp = vp; 551 return (0); 552 } 553 554 /* 555 * File handle to vnode 556 * 557 * Have to be really careful about stale file handles: 558 * - check that the inode number is valid 559 * - call lfs_vget() to get the locked inode 560 * - check for an unallocated inode (i_mode == 0) 561 * - check that the given client host has export rights and return 562 * those rights via. exflagsp and credanonp 563 * 564 * XXX 565 * use ifile to see if inode is allocated instead of reading off disk 566 * what is the relationship between my generational number and the NFS 567 * generational number. 568 */ 569 int 570 lfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 571 register struct mount *mp; 572 struct fid *fhp; 573 struct mbuf *nam; 574 struct vnode **vpp; 575 int *exflagsp; 576 struct ucred **credanonp; 577 { 578 register struct ufid *ufhp; 579 580 ufhp = (struct ufid *)fhp; 581 if (ufhp->ufid_ino < ROOTINO) 582 return (ESTALE); 583 return (ufs_check_export(mp, ufhp, nam, vpp, exflagsp, credanonp)); 584 } 585 586 /* 587 * Vnode pointer to File handle 588 */ 589 /* ARGSUSED */ 590 int 591 lfs_vptofh(vp, fhp) 592 struct vnode *vp; 593 struct fid *fhp; 594 { 595 register struct inode *ip; 596 register struct ufid *ufhp; 597 598 ip = VTOI(vp); 599 ufhp = (struct ufid *)fhp; 600 ufhp->ufid_len = sizeof(struct ufid); 601 ufhp->ufid_ino = ip->i_number; 602 ufhp->ufid_gen = ip->i_ffs_gen; 603 return (0); 604 } 605
Indexes created Sat Sep 27 22:09:54 GMT 2025