1 /* 2 * Copyright (c) 1989, 1991 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)ffs_vfsops.c 7.64 (Berkeley) 03/22/92 8 */ 9 10 #include <sys/param.h> 11 #include <sys/systm.h> 12 #include <sys/namei.h> 13 #include <sys/proc.h> 14 #include <sys/kernel.h> 15 #include <sys/vnode.h> 16 #include <sys/specdev.h> 17 #include <sys/mount.h> 18 #include <sys/buf.h> 19 #include <sys/file.h> 20 #include <sys/disklabel.h> 21 #include <sys/ioctl.h> 22 #include <sys/errno.h> 23 #include <sys/malloc.h> 24 25 #include <ufs/ufs/quota.h> 26 #include <ufs/ufs/ufsmount.h> 27 #include <ufs/ufs/inode.h> 28 #include <ufs/ufs/ufs_extern.h> 29 30 #include <ufs/ffs/fs.h> 31 #include <ufs/ffs/ffs_extern.h> 32 33 int ffs_sbupdate __P((struct ufsmount *, int)); 34 35 struct vfsops ufs_vfsops = { 36 ffs_mount, 37 ufs_start, 38 ffs_unmount, 39 ffs_root, 40 ufs_quotactl, 41 ffs_statfs, 42 ffs_sync, 43 ffs_fhtovp, 44 ffs_vptofh, 45 ffs_init, 46 }; 47 48 /* 49 * Called by main() when ufs is going to be mounted as root. 50 * 51 * Name is updated by mount(8) after booting. 52 */ 53 #define ROOTNAME "root_device" 54 55 ffs_mountroot() 56 { 57 extern struct vnode *rootvp; 58 register struct fs *fs; 59 register struct mount *mp; 60 struct proc *p = curproc; /* XXX */ 61 struct ufsmount *ump; 62 u_int size; 63 int error; 64 65 mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK); 66 mp->mnt_op = &ufs_vfsops; 67 mp->mnt_flag = MNT_RDONLY; 68 mp->mnt_mounth = NULLVP; 69 if (error = ffs_mountfs(rootvp, mp, p)) { 70 free(mp, M_MOUNT); 71 return (error); 72 } 73 if (error = vfs_lock(mp)) { 74 (void)ffs_unmount(mp, 0, p); 75 free(mp, M_MOUNT); 76 return (error); 77 } 78 rootfs = mp; 79 mp->mnt_next = mp; 80 mp->mnt_prev = mp; 81 mp->mnt_vnodecovered = NULLVP; 82 ump = VFSTOUFS(mp); 83 fs = ump->um_fs; 84 bzero(fs->fs_fsmnt, sizeof(fs->fs_fsmnt)); 85 fs->fs_fsmnt[0] = '/'; 86 bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname, 87 MNAMELEN); 88 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 89 &size); 90 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 91 (void)ffs_statfs(mp, &mp->mnt_stat, p); 92 vfs_unlock(mp); 93 inittodr(fs->fs_time); 94 return (0); 95 } 96 97 /* 98 * VFS Operations. 99 * 100 * mount system call 101 */ 102 int 103 ffs_mount(mp, path, data, ndp, p) 104 register struct mount *mp; 105 char *path; 106 caddr_t data; 107 struct nameidata *ndp; 108 struct proc *p; 109 { 110 struct vnode *devvp; 111 struct ufs_args args; 112 struct ufsmount *ump; 113 register struct fs *fs; 114 u_int size; 115 int error; 116 117 if (error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args))) 118 return (error); 119 /* 120 * If updating, check whether changing from read-only to 121 * read/write; if there is no device name, that's all we do. 122 */ 123 if (mp->mnt_flag & MNT_UPDATE) { 124 ump = VFSTOUFS(mp); 125 fs = ump->um_fs; 126 if (fs->fs_ronly && (mp->mnt_flag & MNT_RDONLY) == 0) 127 fs->fs_ronly = 0; 128 if (args.fspec == 0) { 129 /* 130 * Process export requests. 131 */ 132 if (args.exflags & MNT_EXPORTED) { 133 if (error = hang_addrlist(mp, &args)) 134 return (error); 135 mp->mnt_flag |= MNT_EXPORTED; 136 } 137 if (args.exflags & MNT_DELEXPORT) { 138 free_addrlist(ump); 139 mp->mnt_flag &= 140 ~(MNT_EXPORTED | MNT_DEFEXPORTED); 141 } 142 return (0); 143 } 144 } 145 /* 146 * Not an update, or updating the name: look up the name 147 * and verify that it refers to a sensible block device. 148 */ 149 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 150 if (error = namei(ndp)) 151 return (error); 152 devvp = ndp->ni_vp; 153 154 if (devvp->v_type != VBLK) { 155 vrele(devvp); 156 return (ENOTBLK); 157 } 158 if (major(devvp->v_rdev) >= nblkdev) { 159 vrele(devvp); 160 return (ENXIO); 161 } 162 if ((mp->mnt_flag & MNT_UPDATE) == 0) 163 error = ffs_mountfs(devvp, mp, p); 164 else { 165 if (devvp != ump->um_devvp) 166 error = EINVAL; /* needs translation */ 167 else 168 vrele(devvp); 169 } 170 if (error) { 171 vrele(devvp); 172 return (error); 173 } 174 ump = VFSTOUFS(mp); 175 fs = ump->um_fs; 176 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size); 177 bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size); 178 bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname, 179 MNAMELEN); 180 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 181 &size); 182 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 183 (void)ffs_statfs(mp, &mp->mnt_stat, p); 184 return (0); 185 } 186 187 /* 188 * Common code for mount and mountroot 189 */ 190 int 191 ffs_mountfs(devvp, mp, p) 192 register struct vnode *devvp; 193 struct mount *mp; 194 struct proc *p; 195 { 196 register struct ufsmount *ump = (struct ufsmount *)0; 197 struct buf *bp = NULL; 198 register struct fs *fs; 199 dev_t dev = devvp->v_rdev; 200 struct partinfo dpart; 201 caddr_t base, space; 202 int havepart = 0, blks; 203 int error, i, size; 204 int needclose = 0; 205 int ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 206 extern struct vnode *rootvp; 207 208 /* 209 * Disallow multiple mounts of the same device. 210 * Disallow mounting of a device that is currently in use 211 * (except for root, which might share swap device for miniroot). 212 * Flush out any old buffers remaining from a previous use. 213 */ 214 if (error = ufs_mountedon(devvp)) 215 return (error); 216 if (vcount(devvp) > 1 && devvp != rootvp) 217 return (EBUSY); 218 vinvalbuf(devvp, 1); 219 if (error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p)) 220 return (error); 221 needclose = 1; 222 if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, NOCRED, p) != 0) 223 size = DEV_BSIZE; 224 else { 225 havepart = 1; 226 size = dpart.disklab->d_secsize; 227 } 228 if (error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) 229 goto out; 230 fs = bp->b_un.b_fs; 231 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE || 232 fs->fs_bsize < sizeof(struct fs)) { 233 error = EINVAL; /* XXX needs translation */ 234 goto out; 235 } 236 ump = malloc(sizeof *ump, M_UFSMNT, M_WAITOK); 237 bzero((caddr_t)ump, sizeof *ump); 238 ump->um_fs = malloc((u_long)fs->fs_sbsize, M_UFSMNT, 239 M_WAITOK); 240 bcopy((caddr_t)bp->b_un.b_addr, (caddr_t)ump->um_fs, 241 (u_int)fs->fs_sbsize); 242 if (fs->fs_sbsize < SBSIZE) 243 bp->b_flags |= B_INVAL; 244 brelse(bp); 245 bp = NULL; 246 fs = ump->um_fs; 247 fs->fs_ronly = ronly; 248 if (ronly == 0) 249 fs->fs_fmod = 1; 250 if (havepart) { 251 dpart.part->p_fstype = FS_BSDFFS; 252 dpart.part->p_fsize = fs->fs_fsize; 253 dpart.part->p_frag = fs->fs_frag; 254 dpart.part->p_cpg = fs->fs_cpg; 255 } 256 blks = howmany(fs->fs_cssize, fs->fs_fsize); 257 base = space = malloc((u_long)fs->fs_cssize, M_UFSMNT, 258 M_WAITOK); 259 for (i = 0; i < blks; i += fs->fs_frag) { 260 size = fs->fs_bsize; 261 if (i + fs->fs_frag > blks) 262 size = (blks - i) * fs->fs_fsize; 263 error = bread(devvp, fsbtodb(fs, fs->fs_csaddr + i), size, 264 NOCRED, &bp); 265 if (error) { 266 free(base, M_UFSMNT); 267 goto out; 268 } 269 bcopy((caddr_t)bp->b_un.b_addr, space, (u_int)size); 270 fs->fs_csp[fragstoblks(fs, i)] = (struct csum *)space; 271 space += size; 272 brelse(bp); 273 bp = NULL; 274 } 275 mp->mnt_data = (qaddr_t)ump; 276 mp->mnt_stat.f_fsid.val[0] = (long)dev; 277 mp->mnt_stat.f_fsid.val[1] = MOUNT_UFS; 278 mp->mnt_flag |= MNT_LOCAL; 279 ump->um_mountp = mp; 280 ump->um_dev = dev; 281 ump->um_devvp = devvp; 282 for (i = 0; i < MAXQUOTAS; i++) 283 ump->um_quotas[i] = NULLVP; 284 devvp->v_specflags |= SI_MOUNTEDON; 285 286 /* Sanity checks for old file systems. XXX */ 287 fs->fs_npsect = MAX(fs->fs_npsect, fs->fs_nsect); /* XXX */ 288 fs->fs_interleave = MAX(fs->fs_interleave, 1); /* XXX */ 289 if (fs->fs_postblformat == FS_42POSTBLFMT) /* XXX */ 290 fs->fs_nrpos = 8; /* XXX */ 291 return (0); 292 out: 293 if (bp) 294 brelse(bp); 295 if (needclose) 296 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p); 297 if (ump) { 298 free(ump->um_fs, M_UFSMNT); 299 free(ump, M_UFSMNT); 300 mp->mnt_data = (qaddr_t)0; 301 } 302 return (error); 303 } 304 305 /* 306 * unmount system call 307 */ 308 int 309 ffs_unmount(mp, mntflags, p) 310 struct mount *mp; 311 int mntflags; 312 struct proc *p; 313 { 314 extern int doforce; 315 register struct ufsmount *ump; 316 register struct fs *fs; 317 int i, error, ronly, flags = 0; 318 319 if (mntflags & MNT_FORCE) { 320 if (!doforce || mp == rootfs) 321 return (EINVAL); 322 flags |= FORCECLOSE; 323 } 324 mntflushbuf(mp, 0); 325 if (mntinvalbuf(mp)) 326 return (EBUSY); 327 ump = VFSTOUFS(mp); 328 #ifdef QUOTA 329 if (mp->mnt_flag & MNT_QUOTA) { 330 if (error = vflush(mp, NULLVP, SKIPSYSTEM|flags)) 331 return (error); 332 for (i = 0; i < MAXQUOTAS; i++) { 333 if (ump->um_quotas[i] == NULLVP) 334 continue; 335 quotaoff(p, mp, i); 336 } 337 /* 338 * Here we fall through to vflush again to ensure 339 * that we have gotten rid of all the system vnodes. 340 */ 341 } 342 #endif 343 if (error = vflush(mp, NULLVP, flags)) 344 return (error); 345 fs = ump->um_fs; 346 ronly = !fs->fs_ronly; 347 ump->um_devvp->v_specflags &= ~SI_MOUNTEDON; 348 error = VOP_CLOSE(ump->um_devvp, ronly ? FREAD : FREAD|FWRITE, 349 NOCRED, p); 350 vrele(ump->um_devvp); 351 free(fs->fs_csp[0], M_UFSMNT); 352 free(fs, M_UFSMNT); 353 free(ump, M_UFSMNT); 354 mp->mnt_data = (qaddr_t)0; 355 mp->mnt_flag &= ~MNT_LOCAL; 356 return (error); 357 } 358 359 /* 360 * Return root of a filesystem 361 */ 362 int 363 ffs_root(mp, vpp) 364 struct mount *mp; 365 struct vnode **vpp; 366 { 367 struct vnode *nvp; 368 int error; 369 370 if (error = ffs_vget(mp, (ino_t)ROOTINO, &nvp)) 371 return (error); 372 *vpp = nvp; 373 return (0); 374 } 375 376 /* 377 * Get file system statistics. 378 */ 379 int 380 ffs_statfs(mp, sbp, p) 381 struct mount *mp; 382 register struct statfs *sbp; 383 struct proc *p; 384 { 385 register struct ufsmount *ump; 386 register struct fs *fs; 387 388 ump = VFSTOUFS(mp); 389 fs = ump->um_fs; 390 if (fs->fs_magic != FS_MAGIC) 391 panic("ffs_statfs"); 392 sbp->f_type = MOUNT_UFS; 393 sbp->f_bsize = fs->fs_fsize; 394 sbp->f_iosize = fs->fs_bsize; 395 sbp->f_blocks = fs->fs_dsize; 396 sbp->f_bfree = fs->fs_cstotal.cs_nbfree * fs->fs_frag + 397 fs->fs_cstotal.cs_nffree; 398 sbp->f_bavail = (fs->fs_dsize * (100 - fs->fs_minfree) / 100) - 399 (fs->fs_dsize - sbp->f_bfree); 400 sbp->f_files = fs->fs_ncg * fs->fs_ipg - ROOTINO; 401 sbp->f_ffree = fs->fs_cstotal.cs_nifree; 402 if (sbp != &mp->mnt_stat) { 403 bcopy((caddr_t)mp->mnt_stat.f_mntonname, 404 (caddr_t)&sbp->f_mntonname[0], MNAMELEN); 405 bcopy((caddr_t)mp->mnt_stat.f_mntfromname, 406 (caddr_t)&sbp->f_mntfromname[0], MNAMELEN); 407 } 408 return (0); 409 } 410 411 /* 412 * Go through the disk queues to initiate sandbagged IO; 413 * go through the inodes to write those that have been modified; 414 * initiate the writing of the super block if it has been modified. 415 * 416 * Note: we are always called with the filesystem marked `MPBUSY'. 417 */ 418 int 419 ffs_sync(mp, waitfor) 420 struct mount *mp; 421 int waitfor; 422 { 423 extern int syncprt; 424 register struct vnode *vp; 425 register struct inode *ip; 426 register struct ufsmount *ump = VFSTOUFS(mp); 427 register struct fs *fs; 428 int error, allerror = 0; 429 430 if (syncprt) 431 ufs_bufstats(); 432 fs = ump->um_fs; 433 /* 434 * Write back modified superblock. 435 * Consistency check that the superblock 436 * is still in the buffer cache. 437 */ 438 if (fs->fs_fmod != 0) { 439 if (fs->fs_ronly != 0) { /* XXX */ 440 printf("fs = %s\n", fs->fs_fsmnt); 441 panic("update: rofs mod"); 442 } 443 fs->fs_fmod = 0; 444 fs->fs_time = time.tv_sec; 445 allerror = ffs_sbupdate(ump, waitfor); 446 } 447 /* 448 * Write back each (modified) inode. 449 */ 450 loop: 451 for (vp = mp->mnt_mounth; vp; vp = vp->v_mountf) { 452 /* 453 * If the vnode that we are about to sync is no longer 454 * associated with this mount point, start over. 455 */ 456 if (vp->v_mount != mp) 457 goto loop; 458 if (VOP_ISLOCKED(vp)) 459 continue; 460 ip = VTOI(vp); 461 if ((ip->i_flag & (IMOD|IACC|IUPD|ICHG)) == 0 && 462 vp->v_dirtyblkhd == NULL) 463 continue; 464 if (vget(vp)) 465 goto loop; 466 if (vp->v_dirtyblkhd) 467 vflushbuf(vp, 0); 468 if ((ip->i_flag & (IMOD|IACC|IUPD|ICHG)) && 469 (error = ffs_update(vp, &time, &time, 0))) 470 allerror = error; 471 vput(vp); 472 } 473 /* 474 * Force stale file system control information to be flushed. 475 */ 476 vflushbuf(ump->um_devvp, waitfor == MNT_WAIT ? B_SYNC : 0); 477 #ifdef QUOTA 478 qsync(mp); 479 #endif 480 return (allerror); 481 } 482 483 /* 484 * File handle to vnode 485 * 486 * Have to be really careful about stale file handles: 487 * - check that the inode number is valid 488 * - call ffs_vget() to get the locked inode 489 * - check for an unallocated inode (i_mode == 0) 490 * - check that the generation number matches unless setgen true 491 */ 492 int 493 ffs_fhtovp(mp, fhp, setgen, vpp) 494 register struct mount *mp; 495 struct fid *fhp; 496 int setgen; 497 struct vnode **vpp; 498 { 499 register struct inode *ip; 500 register struct ufid *ufhp; 501 struct fs *fs; 502 struct vnode *nvp; 503 int error; 504 505 ufhp = (struct ufid *)fhp; 506 fs = VFSTOUFS(mp)->um_fs; 507 if (ufhp->ufid_ino < ROOTINO || 508 ufhp->ufid_ino >= fs->fs_ncg * fs->fs_ipg) 509 return (EINVAL); 510 if (error = ffs_vget(mp, ufhp->ufid_ino, &nvp)) { 511 *vpp = NULLVP; 512 return (error); 513 } 514 ip = VTOI(nvp); 515 if (ip->i_mode == 0) { 516 ufs_iput(ip); 517 *vpp = NULLVP; 518 return (EINVAL); 519 } 520 if (ip->i_gen != ufhp->ufid_gen) { 521 if (setgen) 522 ufhp->ufid_gen = ip->i_gen; 523 else { 524 ufs_iput(ip); 525 *vpp = NULLVP; 526 return (EINVAL); 527 } 528 } 529 *vpp = nvp; 530 return (0); 531 } 532 533 /* 534 * Vnode pointer to File handle 535 */ 536 /* ARGSUSED */ 537 ffs_vptofh(vp, fhp) 538 struct vnode *vp; 539 struct fid *fhp; 540 { 541 register struct inode *ip; 542 register struct ufid *ufhp; 543 544 ip = VTOI(vp); 545 ufhp = (struct ufid *)fhp; 546 ufhp->ufid_len = sizeof(struct ufid); 547 ufhp->ufid_ino = ip->i_number; 548 ufhp->ufid_gen = ip->i_gen; 549 return (0); 550 } 551 552 /* 553 * Write a superblock and associated information back to disk. 554 */ 555 int 556 ffs_sbupdate(mp, waitfor) 557 struct ufsmount *mp; 558 int waitfor; 559 { 560 register struct fs *fs = mp->um_fs; 561 register struct buf *bp; 562 int blks; 563 caddr_t space; 564 int i, size, error = 0; 565 566 bp = getblk(mp->um_devvp, SBLOCK, (int)fs->fs_sbsize); 567 bcopy((caddr_t)fs, bp->b_un.b_addr, (u_int)fs->fs_sbsize); 568 /* Restore compatibility to old file systems. XXX */ 569 if (fs->fs_postblformat == FS_42POSTBLFMT) /* XXX */ 570 bp->b_un.b_fs->fs_nrpos = -1; /* XXX */ 571 if (waitfor == MNT_WAIT) 572 error = bwrite(bp); 573 else 574 bawrite(bp); 575 blks = howmany(fs->fs_cssize, fs->fs_fsize); 576 space = (caddr_t)fs->fs_csp[0]; 577 for (i = 0; i < blks; i += fs->fs_frag) { 578 size = fs->fs_bsize; 579 if (i + fs->fs_frag > blks) 580 size = (blks - i) * fs->fs_fsize; 581 bp = getblk(mp->um_devvp, fsbtodb(fs, fs->fs_csaddr + i), size); 582 bcopy(space, bp->b_un.b_addr, (u_int)size); 583 space += size; 584 if (waitfor == MNT_WAIT) 585 error = bwrite(bp); 586 else 587 bawrite(bp); 588 } 589 return (error); 590 } 591