ext2fs_vfsops.c revision 1.32
1 /* $NetBSD: ext2fs_vfsops.c,v 1.32 2000/01/28 16:00:23 bouyer Exp $ */ 2 3 /* 4 * Copyright (c) 1997 Manuel Bouyer. 5 * Copyright (c) 1989, 1991, 1993, 1994 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)ffs_vfsops.c 8.14 (Berkeley) 11/28/94 37 * Modified for ext2fs by Manuel Bouyer. 38 */ 39 40 #if defined(_KERNEL) && !defined(_LKM) 41 #include "opt_compat_netbsd.h" 42 #endif 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/namei.h> 47 #include <sys/proc.h> 48 #include <sys/kernel.h> 49 #include <sys/vnode.h> 50 #include <sys/socket.h> 51 #include <sys/mount.h> 52 #include <sys/buf.h> 53 #include <sys/device.h> 54 #include <sys/mbuf.h> 55 #include <sys/file.h> 56 #include <sys/disklabel.h> 57 #include <sys/ioctl.h> 58 #include <sys/errno.h> 59 #include <sys/malloc.h> 60 #include <sys/pool.h> 61 #include <sys/lock.h> 62 63 #include <miscfs/specfs/specdev.h> 64 65 #include <ufs/ufs/quota.h> 66 #include <ufs/ufs/ufsmount.h> 67 #include <ufs/ufs/inode.h> 68 #include <ufs/ufs/dir.h> 69 #include <ufs/ufs/ufs_extern.h> 70 71 #include <ufs/ext2fs/ext2fs.h> 72 #include <ufs/ext2fs/ext2fs_extern.h> 73 74 extern struct lock ufs_hashlock; 75 76 int ext2fs_sbupdate __P((struct ufsmount *, int)); 77 static int ext2fs_checksb __P((struct ext2fs *, int)); 78 79 extern struct vnodeopv_desc ext2fs_vnodeop_opv_desc; 80 extern struct vnodeopv_desc ext2fs_specop_opv_desc; 81 extern struct vnodeopv_desc ext2fs_fifoop_opv_desc; 82 83 struct vnodeopv_desc *ext2fs_vnodeopv_descs[] = { 84 &ext2fs_vnodeop_opv_desc, 85 &ext2fs_specop_opv_desc, 86 &ext2fs_fifoop_opv_desc, 87 NULL, 88 }; 89 90 struct vfsops ext2fs_vfsops = { 91 MOUNT_EXT2FS, 92 ext2fs_mount, 93 ufs_start, 94 ext2fs_unmount, 95 ufs_root, 96 ufs_quotactl, 97 ext2fs_statfs, 98 ext2fs_sync, 99 ext2fs_vget, 100 ext2fs_fhtovp, 101 ext2fs_vptofh, 102 ext2fs_init, 103 ext2fs_sysctl, 104 ext2fs_mountroot, 105 ufs_check_export, 106 ext2fs_vnodeopv_descs, 107 }; 108 109 struct pool ext2fs_inode_pool; 110 111 extern u_long ext2gennumber; 112 113 void 114 ext2fs_init() 115 { 116 ufs_init(); 117 118 /* 119 * XXX Same structure as FFS inodes? Should we share a common pool? 120 */ 121 pool_init(&ext2fs_inode_pool, sizeof(struct inode), 0, 0, 0, 122 "ext2fsinopl", 0, pool_page_alloc_nointr, pool_page_free_nointr, 123 M_EXT2FSNODE); 124 } 125 126 127 /* 128 * Called by main() when ext2fs is going to be mounted as root. 129 * 130 * Name is updated by mount(8) after booting. 131 */ 132 #define ROOTNAME "root_device" 133 134 int 135 ext2fs_mountroot() 136 { 137 extern struct vnode *rootvp; 138 struct m_ext2fs *fs; 139 struct mount *mp; 140 struct proc *p = curproc; /* XXX */ 141 struct ufsmount *ump; 142 int error; 143 144 if (root_device->dv_class != DV_DISK) 145 return (ENODEV); 146 147 /* 148 * Get vnodes for rootdev. 149 */ 150 if (bdevvp(rootdev, &rootvp)) 151 panic("ext2fs_mountroot: can't setup bdevvp's"); 152 153 if ((error = vfs_rootmountalloc(MOUNT_EXT2FS, "root_device", &mp))) { 154 vrele(rootvp); 155 return (error); 156 } 157 158 if ((error = ext2fs_mountfs(rootvp, mp, p)) != 0) { 159 mp->mnt_op->vfs_refcount--; 160 vfs_unbusy(mp); 161 free(mp, M_MOUNT); 162 vrele(rootvp); 163 return (error); 164 } 165 simple_lock(&mountlist_slock); 166 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 167 simple_unlock(&mountlist_slock); 168 ump = VFSTOUFS(mp); 169 fs = ump->um_e2fs; 170 memset(fs->e2fs_fsmnt, 0, sizeof(fs->e2fs_fsmnt)); 171 (void) copystr(mp->mnt_stat.f_mntonname, fs->e2fs_fsmnt, 172 sizeof(fs->e2fs_fsmnt) - 1, 0); 173 if (fs->e2fs.e2fs_rev > E2FS_REV0) { 174 memset(fs->e2fs.e2fs_fsmnt, 0, sizeof(fs->e2fs.e2fs_fsmnt)); 175 (void) copystr(mp->mnt_stat.f_mntonname, fs->e2fs.e2fs_fsmnt, 176 sizeof(fs->e2fs.e2fs_fsmnt) - 1, 0); 177 } 178 (void)ext2fs_statfs(mp, &mp->mnt_stat, p); 179 vfs_unbusy(mp); 180 inittodr(fs->e2fs.e2fs_wtime); 181 return (0); 182 } 183 184 /* 185 * VFS Operations. 186 * 187 * mount system call 188 */ 189 int 190 ext2fs_mount(mp, path, data, ndp, p) 191 register struct mount *mp; 192 const char *path; 193 void * data; 194 struct nameidata *ndp; 195 struct proc *p; 196 { 197 struct vnode *devvp; 198 struct ufs_args args; 199 struct ufsmount *ump = NULL; 200 register struct m_ext2fs *fs; 201 size_t size; 202 int error, flags; 203 mode_t accessmode; 204 205 error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args)); 206 if (error) 207 return (error); 208 /* 209 * If updating, check whether changing from read-only to 210 * read/write; if there is no device name, that's all we do. 211 */ 212 if (mp->mnt_flag & MNT_UPDATE) { 213 ump = VFSTOUFS(mp); 214 fs = ump->um_e2fs; 215 if (fs->e2fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 216 flags = WRITECLOSE; 217 if (mp->mnt_flag & MNT_FORCE) 218 flags |= FORCECLOSE; 219 error = ext2fs_flushfiles(mp, flags, p); 220 if (error == 0 && 221 ext2fs_cgupdate(ump, MNT_WAIT) == 0 && 222 (fs->e2fs.e2fs_state & E2FS_ERRORS) == 0) { 223 fs->e2fs.e2fs_state = E2FS_ISCLEAN; 224 (void) ext2fs_sbupdate(ump, MNT_WAIT); 225 } 226 if (error) 227 return (error); 228 fs->e2fs_ronly = 1; 229 } 230 if (mp->mnt_flag & MNT_RELOAD) { 231 error = ext2fs_reload(mp, ndp->ni_cnd.cn_cred, p); 232 if (error) 233 return (error); 234 } 235 if (fs->e2fs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) { 236 /* 237 * If upgrade to read-write by non-root, then verify 238 * that user has necessary permissions on the device. 239 */ 240 if (p->p_ucred->cr_uid != 0) { 241 devvp = ump->um_devvp; 242 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 243 error = VOP_ACCESS(devvp, VREAD | VWRITE, 244 p->p_ucred, p); 245 VOP_UNLOCK(devvp, 0); 246 if (error) 247 return (error); 248 } 249 fs->e2fs_ronly = 0; 250 if (fs->e2fs.e2fs_state == E2FS_ISCLEAN) 251 fs->e2fs.e2fs_state = 0; 252 else 253 fs->e2fs.e2fs_state = E2FS_ERRORS; 254 fs->e2fs_fmod = 1; 255 } 256 if (args.fspec == 0) { 257 /* 258 * Process export requests. 259 */ 260 return (vfs_export(mp, &ump->um_export, &args.export)); 261 } 262 } 263 /* 264 * Not an update, or updating the name: look up the name 265 * and verify that it refers to a sensible block device. 266 */ 267 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 268 if ((error = namei(ndp)) != 0) 269 return (error); 270 devvp = ndp->ni_vp; 271 272 if (devvp->v_type != VBLK) { 273 vrele(devvp); 274 return (ENOTBLK); 275 } 276 if (major(devvp->v_rdev) >= nblkdev) { 277 vrele(devvp); 278 return (ENXIO); 279 } 280 /* 281 * If mount by non-root, then verify that user has necessary 282 * permissions on the device. 283 */ 284 if (p->p_ucred->cr_uid != 0) { 285 accessmode = VREAD; 286 if ((mp->mnt_flag & MNT_RDONLY) == 0) 287 accessmode |= VWRITE; 288 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 289 error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p); 290 VOP_UNLOCK(devvp, 0); 291 if (error) { 292 vrele(devvp); 293 return (error); 294 } 295 } 296 if ((mp->mnt_flag & MNT_UPDATE) == 0) 297 error = ext2fs_mountfs(devvp, mp, p); 298 else { 299 if (devvp != ump->um_devvp) 300 error = EINVAL; /* needs translation */ 301 else 302 vrele(devvp); 303 } 304 if (error) { 305 vrele(devvp); 306 return (error); 307 } 308 ump = VFSTOUFS(mp); 309 fs = ump->um_e2fs; 310 (void) copyinstr(path, fs->e2fs_fsmnt, sizeof(fs->e2fs_fsmnt) - 1, 311 &size); 312 memset(fs->e2fs_fsmnt + size, 0, sizeof(fs->e2fs_fsmnt) - size); 313 if (fs->e2fs.e2fs_rev > E2FS_REV0) { 314 (void) copystr(mp->mnt_stat.f_mntonname, fs->e2fs.e2fs_fsmnt, 315 sizeof(fs->e2fs.e2fs_fsmnt) - 1, &size); 316 memset(fs->e2fs.e2fs_fsmnt, 0, 317 sizeof(fs->e2fs.e2fs_fsmnt) - size); 318 } 319 memcpy(mp->mnt_stat.f_mntonname, fs->e2fs_fsmnt, MNAMELEN); 320 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 321 &size); 322 memset(mp->mnt_stat.f_mntfromname + size, 0, MNAMELEN - size); 323 if (fs->e2fs_fmod != 0) { /* XXX */ 324 fs->e2fs_fmod = 0; 325 if (fs->e2fs.e2fs_state == 0) 326 fs->e2fs.e2fs_wtime = time.tv_sec; 327 else 328 printf("%s: file system not clean; please fsck(8)\n", 329 mp->mnt_stat.f_mntfromname); 330 (void) ext2fs_cgupdate(ump, MNT_WAIT); 331 } 332 return (0); 333 } 334 335 /* 336 * Reload all incore data for a filesystem (used after running fsck on 337 * the root filesystem and finding things to fix). The filesystem must 338 * be mounted read-only. 339 * 340 * Things to do to update the mount: 341 * 1) invalidate all cached meta-data. 342 * 2) re-read superblock from disk. 343 * 3) re-read summary information from disk. 344 * 4) invalidate all inactive vnodes. 345 * 5) invalidate all cached file data. 346 * 6) re-read inode data for all active vnodes. 347 */ 348 int 349 ext2fs_reload(mountp, cred, p) 350 register struct mount *mountp; 351 struct ucred *cred; 352 struct proc *p; 353 { 354 register struct vnode *vp, *nvp, *devvp; 355 struct inode *ip; 356 struct buf *bp; 357 struct m_ext2fs *fs; 358 struct ext2fs *newfs; 359 struct partinfo dpart; 360 int i, size, error; 361 caddr_t cp; 362 363 if ((mountp->mnt_flag & MNT_RDONLY) == 0) 364 return (EINVAL); 365 /* 366 * Step 1: invalidate all cached meta-data. 367 */ 368 devvp = VFSTOUFS(mountp)->um_devvp; 369 if (vinvalbuf(devvp, 0, cred, p, 0, 0)) 370 panic("ext2fs_reload: dirty1"); 371 /* 372 * Step 2: re-read superblock from disk. 373 */ 374 if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, NOCRED, p) != 0) 375 size = DEV_BSIZE; 376 else 377 size = dpart.disklab->d_secsize; 378 error = bread(devvp, (ufs_daddr_t)(SBOFF / size), SBSIZE, NOCRED, &bp); 379 if (error) { 380 brelse(bp); 381 return (error); 382 } 383 newfs = (struct ext2fs *)bp->b_data; 384 error = ext2fs_checksb(newfs, (mountp->mnt_flag & MNT_RDONLY) != 0); 385 if (error) { 386 brelse(bp); 387 return (error); 388 } 389 390 fs = VFSTOUFS(mountp)->um_e2fs; 391 /* 392 * copy in new superblock, and compute in-memory values 393 */ 394 e2fs_sbload(newfs, &fs->e2fs); 395 fs->e2fs_ncg = 396 howmany(fs->e2fs.e2fs_bcount - fs->e2fs.e2fs_first_dblock, 397 fs->e2fs.e2fs_bpg); 398 /* XXX assume hw bsize = 512 */ 399 fs->e2fs_fsbtodb = fs->e2fs.e2fs_log_bsize + 1; 400 fs->e2fs_bsize = 1024 << fs->e2fs.e2fs_log_bsize; 401 fs->e2fs_bshift = LOG_MINBSIZE + fs->e2fs.e2fs_log_bsize; 402 fs->e2fs_qbmask = fs->e2fs_bsize - 1; 403 fs->e2fs_bmask = ~fs->e2fs_qbmask; 404 fs->e2fs_ngdb = howmany(fs->e2fs_ncg, 405 fs->e2fs_bsize / sizeof(struct ext2_gd)); 406 fs->e2fs_ipb = fs->e2fs_bsize / EXT2_DINODE_SIZE; 407 fs->e2fs_itpg = fs->e2fs.e2fs_ipg/fs->e2fs_ipb; 408 409 /* 410 * Step 3: re-read summary information from disk. 411 */ 412 413 for (i=0; i < fs->e2fs_ngdb; i++) { 414 error = bread(devvp , 415 fsbtodb(fs, ((fs->e2fs_bsize>1024)? 0 : 1) + i + 1), 416 fs->e2fs_bsize, NOCRED, &bp); 417 if (error) { 418 brelse(bp); 419 return (error); 420 } 421 e2fs_cgload((struct ext2_gd*)bp->b_data, 422 &fs->e2fs_gd[i* fs->e2fs_bsize / sizeof(struct ext2_gd)], 423 fs->e2fs_bsize); 424 brelse(bp); 425 } 426 427 loop: 428 simple_lock(&mntvnode_slock); 429 for (vp = mountp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) { 430 if (vp->v_mount != mountp) { 431 simple_unlock(&mntvnode_slock); 432 goto loop; 433 } 434 nvp = vp->v_mntvnodes.le_next; 435 /* 436 * Step 4: invalidate all inactive vnodes. 437 */ 438 if (vrecycle(vp, &mntvnode_slock, p)) 439 goto loop; 440 /* 441 * Step 5: invalidate all cached file data. 442 */ 443 simple_lock(&vp->v_interlock); 444 simple_unlock(&mntvnode_slock); 445 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK)) 446 goto loop; 447 if (vinvalbuf(vp, 0, cred, p, 0, 0)) 448 panic("ext2fs_reload: dirty2"); 449 /* 450 * Step 6: re-read inode data for all active vnodes. 451 */ 452 ip = VTOI(vp); 453 error = bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), 454 (int)fs->e2fs_bsize, NOCRED, &bp); 455 if (error) { 456 vput(vp); 457 return (error); 458 } 459 cp = (caddr_t)bp->b_data + 460 (ino_to_fsbo(fs, ip->i_number) * EXT2_DINODE_SIZE); 461 e2fs_iload((struct ext2fs_dinode *)cp, &ip->i_din.e2fs_din); 462 brelse(bp); 463 vput(vp); 464 simple_lock(&mntvnode_slock); 465 } 466 simple_unlock(&mntvnode_slock); 467 return (0); 468 } 469 470 /* 471 * Common code for mount and mountroot 472 */ 473 int 474 ext2fs_mountfs(devvp, mp, p) 475 register struct vnode *devvp; 476 struct mount *mp; 477 struct proc *p; 478 { 479 register struct ufsmount *ump; 480 struct buf *bp; 481 register struct ext2fs *fs; 482 register struct m_ext2fs *m_fs; 483 dev_t dev; 484 struct partinfo dpart; 485 int error, i, size, ronly; 486 struct ucred *cred; 487 extern struct vnode *rootvp; 488 489 dev = devvp->v_rdev; 490 cred = p ? p->p_ucred : NOCRED; 491 /* 492 * Disallow multiple mounts of the same device. 493 * Disallow mounting of a device that is currently in use 494 * (except for root, which might share swap device for miniroot). 495 * Flush out any old buffers remaining from a previous use. 496 */ 497 if ((error = vfs_mountedon(devvp)) != 0) 498 return (error); 499 if (vcount(devvp) > 1 && devvp != rootvp) 500 return (EBUSY); 501 if ((error = vinvalbuf(devvp, V_SAVE, cred, p, 0, 0)) != 0) 502 return (error); 503 504 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 505 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p); 506 if (error) 507 return (error); 508 if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, cred, p) != 0) 509 size = DEV_BSIZE; 510 else 511 size = dpart.disklab->d_secsize; 512 513 bp = NULL; 514 ump = NULL; 515 516 #ifdef DEBUG_EXT2 517 printf("sb size: %d ino size %d\n", sizeof(struct ext2fs), 518 EXT2_DINODE_SIZE); 519 #endif 520 error = bread(devvp, (SBOFF / DEV_BSIZE), SBSIZE, cred, &bp); 521 if (error) 522 goto out; 523 fs = (struct ext2fs *)bp->b_data; 524 if (fs2h16(fs->e2fs_magic) != E2FS_MAGIC) { 525 error = EINVAL; /* XXX needs translation */ 526 goto out; 527 } 528 error = ext2fs_checksb(fs, ronly); 529 if (error) 530 goto out; 531 ump = malloc(sizeof *ump, M_UFSMNT, M_WAITOK); 532 memset((caddr_t)ump, 0, sizeof *ump); 533 ump->um_e2fs = malloc(sizeof(struct m_ext2fs), M_UFSMNT, M_WAITOK); 534 memset((caddr_t)ump->um_e2fs, 0, sizeof(struct m_ext2fs)); 535 e2fs_sbload((struct ext2fs*)bp->b_data, &ump->um_e2fs->e2fs); 536 brelse(bp); 537 bp = NULL; 538 m_fs = ump->um_e2fs; 539 m_fs->e2fs_ronly = ronly; 540 if (ronly == 0) { 541 if (m_fs->e2fs.e2fs_state == E2FS_ISCLEAN) 542 m_fs->e2fs.e2fs_state = 0; 543 else 544 m_fs->e2fs.e2fs_state = E2FS_ERRORS; 545 m_fs->e2fs_fmod = 1; 546 } 547 548 /* compute dynamic sb infos */ 549 m_fs->e2fs_ncg = 550 howmany(m_fs->e2fs.e2fs_bcount - m_fs->e2fs.e2fs_first_dblock, 551 m_fs->e2fs.e2fs_bpg); 552 /* XXX assume hw bsize = 512 */ 553 m_fs->e2fs_fsbtodb = m_fs->e2fs.e2fs_log_bsize + 1; 554 m_fs->e2fs_bsize = 1024 << m_fs->e2fs.e2fs_log_bsize; 555 m_fs->e2fs_bshift = LOG_MINBSIZE + m_fs->e2fs.e2fs_log_bsize; 556 m_fs->e2fs_qbmask = m_fs->e2fs_bsize - 1; 557 m_fs->e2fs_bmask = ~m_fs->e2fs_qbmask; 558 m_fs->e2fs_ngdb = howmany(m_fs->e2fs_ncg, 559 m_fs->e2fs_bsize / sizeof(struct ext2_gd)); 560 m_fs->e2fs_ipb = m_fs->e2fs_bsize / EXT2_DINODE_SIZE; 561 m_fs->e2fs_itpg = m_fs->e2fs.e2fs_ipg/m_fs->e2fs_ipb; 562 563 m_fs->e2fs_gd = malloc(m_fs->e2fs_ngdb * m_fs->e2fs_bsize, 564 M_UFSMNT, M_WAITOK); 565 for (i=0; i < m_fs->e2fs_ngdb; i++) { 566 error = bread(devvp , 567 fsbtodb(m_fs, ((m_fs->e2fs_bsize>1024)? 0 : 1) + i + 1), 568 m_fs->e2fs_bsize, NOCRED, &bp); 569 if (error) { 570 free(m_fs->e2fs_gd, M_UFSMNT); 571 goto out; 572 } 573 e2fs_cgload((struct ext2_gd*)bp->b_data, 574 &m_fs->e2fs_gd[ 575 i * m_fs->e2fs_bsize / sizeof(struct ext2_gd)], 576 m_fs->e2fs_bsize); 577 brelse(bp); 578 bp = NULL; 579 } 580 581 mp->mnt_data = (qaddr_t)ump; 582 mp->mnt_stat.f_fsid.val[0] = (long)dev; 583 mp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_EXT2FS); 584 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN; 585 mp->mnt_flag |= MNT_LOCAL; 586 ump->um_flags = 0; 587 ump->um_mountp = mp; 588 ump->um_dev = dev; 589 ump->um_devvp = devvp; 590 ump->um_nindir = NINDIR(m_fs); 591 ump->um_bptrtodb = m_fs->e2fs_fsbtodb; 592 ump->um_seqinc = 1; /* no frags */ 593 devvp->v_specmountpoint = mp; 594 return (0); 595 out: 596 if (bp) 597 brelse(bp); 598 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 599 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, cred, p); 600 VOP_UNLOCK(devvp, 0); 601 if (ump) { 602 free(ump->um_e2fs, M_UFSMNT); 603 free(ump, M_UFSMNT); 604 mp->mnt_data = (qaddr_t)0; 605 } 606 return (error); 607 } 608 609 /* 610 * unmount system call 611 */ 612 int 613 ext2fs_unmount(mp, mntflags, p) 614 struct mount *mp; 615 int mntflags; 616 struct proc *p; 617 { 618 register struct ufsmount *ump; 619 register struct m_ext2fs *fs; 620 int error, flags; 621 622 flags = 0; 623 if (mntflags & MNT_FORCE) 624 flags |= FORCECLOSE; 625 if ((error = ext2fs_flushfiles(mp, flags, p)) != 0) 626 return (error); 627 ump = VFSTOUFS(mp); 628 fs = ump->um_e2fs; 629 if (fs->e2fs_ronly == 0 && 630 ext2fs_cgupdate(ump, MNT_WAIT) == 0 && 631 (fs->e2fs.e2fs_state & E2FS_ERRORS) == 0) { 632 fs->e2fs.e2fs_state = E2FS_ISCLEAN; 633 (void) ext2fs_sbupdate(ump, MNT_WAIT); 634 } 635 if (ump->um_devvp->v_type != VBAD) 636 ump->um_devvp->v_specmountpoint = NULL; 637 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); 638 error = VOP_CLOSE(ump->um_devvp, fs->e2fs_ronly ? FREAD : FREAD|FWRITE, 639 NOCRED, p); 640 vput(ump->um_devvp); 641 free(fs->e2fs_gd, M_UFSMNT); 642 free(fs, M_UFSMNT); 643 free(ump, M_UFSMNT); 644 mp->mnt_data = (qaddr_t)0; 645 mp->mnt_flag &= ~MNT_LOCAL; 646 return (error); 647 } 648 649 /* 650 * Flush out all the files in a filesystem. 651 */ 652 int 653 ext2fs_flushfiles(mp, flags, p) 654 register struct mount *mp; 655 int flags; 656 struct proc *p; 657 { 658 extern int doforce; 659 register struct ufsmount *ump; 660 int error; 661 662 if (!doforce) 663 flags &= ~FORCECLOSE; 664 ump = VFSTOUFS(mp); 665 error = vflush(mp, NULLVP, flags); 666 return (error); 667 } 668 669 /* 670 * Get file system statistics. 671 */ 672 int 673 ext2fs_statfs(mp, sbp, p) 674 struct mount *mp; 675 register struct statfs *sbp; 676 struct proc *p; 677 { 678 register struct ufsmount *ump; 679 register struct m_ext2fs *fs; 680 u_int32_t overhead, overhead_per_group; 681 int i, ngroups; 682 683 ump = VFSTOUFS(mp); 684 fs = ump->um_e2fs; 685 if (fs->e2fs.e2fs_magic != E2FS_MAGIC) 686 panic("ext2fs_statfs"); 687 688 #ifdef COMPAT_09 689 sbp->f_type = 1; 690 #else 691 sbp->f_type = 0; 692 #endif 693 694 /* 695 * Compute the overhead (FS structures) 696 */ 697 overhead_per_group = 1 /* block bitmap */ + 698 1 /* inode bitmap */ + 699 fs->e2fs_itpg; 700 overhead = fs->e2fs.e2fs_first_dblock + 701 fs->e2fs_ncg * overhead_per_group; 702 if (fs->e2fs.e2fs_rev > E2FS_REV0 && 703 fs->e2fs.e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) { 704 for (i = 0, ngroups = 0; i < fs->e2fs_ncg; i++) { 705 if (cg_has_sb(i)) 706 ngroups++; 707 } 708 } else { 709 ngroups = fs->e2fs_ncg; 710 } 711 overhead += ngroups * (1 + fs->e2fs_ngdb); 712 713 sbp->f_bsize = fs->e2fs_bsize; 714 sbp->f_iosize = fs->e2fs_bsize; 715 sbp->f_blocks = fs->e2fs.e2fs_bcount - overhead; 716 sbp->f_bfree = fs->e2fs.e2fs_fbcount; 717 sbp->f_bavail = sbp->f_bfree - fs->e2fs.e2fs_rbcount; 718 sbp->f_files = fs->e2fs.e2fs_icount; 719 sbp->f_ffree = fs->e2fs.e2fs_ficount; 720 if (sbp != &mp->mnt_stat) { 721 memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); 722 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 723 } 724 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 725 return (0); 726 } 727 728 /* 729 * Go through the disk queues to initiate sandbagged IO; 730 * go through the inodes to write those that have been modified; 731 * initiate the writing of the super block if it has been modified. 732 * 733 * Note: we are always called with the filesystem marked `MPBUSY'. 734 */ 735 int 736 ext2fs_sync(mp, waitfor, cred, p) 737 struct mount *mp; 738 int waitfor; 739 struct ucred *cred; 740 struct proc *p; 741 { 742 struct vnode *vp, *nvp; 743 struct inode *ip; 744 struct ufsmount *ump = VFSTOUFS(mp); 745 struct m_ext2fs *fs; 746 int error, allerror = 0; 747 748 fs = ump->um_e2fs; 749 if (fs->e2fs_ronly != 0) { /* XXX */ 750 printf("fs = %s\n", fs->e2fs_fsmnt); 751 panic("update: rofs mod"); 752 } 753 754 /* 755 * Write back each (modified) inode. 756 */ 757 simple_lock(&mntvnode_slock); 758 loop: 759 for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) { 760 /* 761 * If the vnode that we are about to sync is no longer 762 * associated with this mount point, start over. 763 */ 764 if (vp->v_mount != mp) 765 goto loop; 766 simple_lock(&vp->v_interlock); 767 nvp = vp->v_mntvnodes.le_next; 768 ip = VTOI(vp); 769 if (vp->v_type == VNON || ((ip->i_flag & 770 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 && 771 (vp->v_dirtyblkhd.lh_first == NULL || waitfor == MNT_LAZY))) 772 { 773 simple_unlock(&vp->v_interlock); 774 continue; 775 } 776 simple_unlock(&mntvnode_slock); 777 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 778 if (error) { 779 simple_lock(&mntvnode_slock); 780 if (error == ENOENT) 781 goto loop; 782 continue; 783 } 784 if ((error = VOP_FSYNC(vp, cred, 785 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, p)) != 0) 786 allerror = error; 787 vput(vp); 788 simple_lock(&mntvnode_slock); 789 } 790 simple_unlock(&mntvnode_slock); 791 /* 792 * Force stale file system control information to be flushed. 793 */ 794 if ((error = VOP_FSYNC(ump->um_devvp, cred, 795 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, p)) != 0) 796 allerror = error; 797 /* 798 * Write back modified superblock. 799 */ 800 if (fs->e2fs_fmod != 0) { 801 fs->e2fs_fmod = 0; 802 fs->e2fs.e2fs_wtime = time.tv_sec; 803 if ((error = ext2fs_cgupdate(ump, waitfor))) 804 allerror = error; 805 } 806 return (allerror); 807 } 808 809 /* 810 * Look up a EXT2FS dinode number to find its incore vnode, otherwise read it 811 * in from disk. If it is in core, wait for the lock bit to clear, then 812 * return the inode locked. Detection and handling of mount points must be 813 * done by the calling routine. 814 */ 815 int 816 ext2fs_vget(mp, ino, vpp) 817 struct mount *mp; 818 ino_t ino; 819 struct vnode **vpp; 820 { 821 struct m_ext2fs *fs; 822 struct inode *ip; 823 struct ufsmount *ump; 824 struct buf *bp; 825 struct vnode *vp; 826 dev_t dev; 827 int error; 828 caddr_t cp; 829 830 ump = VFSTOUFS(mp); 831 dev = ump->um_dev; 832 do { 833 if ((*vpp = ufs_ihashget(dev, ino, LK_EXCLUSIVE)) != NULL) 834 return (0); 835 } while (lockmgr(&ufs_hashlock, LK_EXCLUSIVE|LK_SLEEPFAIL, 0)); 836 837 /* Allocate a new vnode/inode. */ 838 if ((error = getnewvnode(VT_EXT2FS, mp, ext2fs_vnodeop_p, &vp)) != 0) { 839 *vpp = NULL; 840 lockmgr(&ufs_hashlock, LK_RELEASE, 0); 841 return (error); 842 } 843 ip = pool_get(&ext2fs_inode_pool, PR_WAITOK); 844 memset((caddr_t)ip, 0, sizeof(struct inode)); 845 vp->v_data = ip; 846 ip->i_vnode = vp; 847 ip->i_e2fs = fs = ump->um_e2fs; 848 ip->i_dev = dev; 849 ip->i_number = ino; 850 ip->i_e2fs_last_lblk = 0; 851 ip->i_e2fs_last_blk = 0; 852 853 /* 854 * Put it onto its hash chain and lock it so that other requests for 855 * this inode will block if they arrive while we are sleeping waiting 856 * for old data structures to be purged or for the contents of the 857 * disk portion of this inode to be read. 858 */ 859 ufs_ihashins(ip); 860 lockmgr(&ufs_hashlock, LK_RELEASE, 0); 861 862 /* Read in the disk contents for the inode, copy into the inode. */ 863 error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)), 864 (int)fs->e2fs_bsize, NOCRED, &bp); 865 if (error) { 866 /* 867 * The inode does not contain anything useful, so it would 868 * be misleading to leave it on its hash chain. With mode 869 * still zero, it will be unlinked and returned to the free 870 * list by vput(). 871 */ 872 vput(vp); 873 brelse(bp); 874 *vpp = NULL; 875 return (error); 876 } 877 cp = (caddr_t)bp->b_data + 878 (ino_to_fsbo(fs, ino) * EXT2_DINODE_SIZE); 879 e2fs_iload((struct ext2fs_dinode *)cp, &ip->i_din.e2fs_din); 880 brelse(bp); 881 882 /* If the inode was deleted, reset all fields */ 883 if (ip->i_e2fs_dtime != 0) { 884 ip->i_e2fs_mode = ip->i_e2fs_size = ip->i_e2fs_nblock = 0; 885 memset(ip->i_e2fs_blocks, 0, sizeof(ip->i_e2fs_blocks)); 886 } 887 888 /* 889 * Initialize the vnode from the inode, check for aliases. 890 * Note that the underlying vnode may have changed. 891 */ 892 error = ext2fs_vinit(mp, ext2fs_specop_p, ext2fs_fifoop_p, &vp); 893 if (error) { 894 vput(vp); 895 *vpp = NULL; 896 return (error); 897 } 898 /* 899 * Finish inode initialization now that aliasing has been resolved. 900 */ 901 ip->i_devvp = ump->um_devvp; 902 VREF(ip->i_devvp); 903 /* 904 * Set up a generation number for this inode if it does not 905 * already have one. This should only happen on old filesystems. 906 */ 907 if (ip->i_e2fs_gen == 0) { 908 if (++ext2gennumber < (u_long)time.tv_sec) 909 ext2gennumber = time.tv_sec; 910 ip->i_e2fs_gen = ext2gennumber; 911 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) 912 ip->i_flag |= IN_MODIFIED; 913 } 914 915 *vpp = vp; 916 return (0); 917 } 918 919 /* 920 * File handle to vnode 921 * 922 * Have to be really careful about stale file handles: 923 * - check that the inode number is valid 924 * - call ext2fs_vget() to get the locked inode 925 * - check for an unallocated inode (i_mode == 0) 926 */ 927 int 928 ext2fs_fhtovp(mp, fhp, vpp) 929 register struct mount *mp; 930 struct fid *fhp; 931 struct vnode **vpp; 932 { 933 register struct inode *ip; 934 struct vnode *nvp; 935 int error; 936 register struct ufid *ufhp; 937 struct m_ext2fs *fs; 938 939 ufhp = (struct ufid *)fhp; 940 fs = VFSTOUFS(mp)->um_e2fs; 941 if ((ufhp->ufid_ino < EXT2_FIRSTINO && ufhp->ufid_ino != EXT2_ROOTINO) || 942 ufhp->ufid_ino >= fs->e2fs_ncg * fs->e2fs.e2fs_ipg) 943 return (ESTALE); 944 945 if ((error = VFS_VGET(mp, ufhp->ufid_ino, &nvp)) != 0) { 946 *vpp = NULLVP; 947 return (error); 948 } 949 ip = VTOI(nvp); 950 if (ip->i_e2fs_mode == 0 || ip->i_e2fs_dtime != 0 || 951 ip->i_e2fs_gen != ufhp->ufid_gen) { 952 vput(nvp); 953 *vpp = NULLVP; 954 return (ESTALE); 955 } 956 *vpp = nvp; 957 return (0); 958 } 959 960 /* 961 * Vnode pointer to File handle 962 */ 963 /* ARGSUSED */ 964 int 965 ext2fs_vptofh(vp, fhp) 966 struct vnode *vp; 967 struct fid *fhp; 968 { 969 register struct inode *ip; 970 register struct ufid *ufhp; 971 972 ip = VTOI(vp); 973 ufhp = (struct ufid *)fhp; 974 ufhp->ufid_len = sizeof(struct ufid); 975 ufhp->ufid_ino = ip->i_number; 976 ufhp->ufid_gen = ip->i_e2fs_gen; 977 return (0); 978 } 979 980 int 981 ext2fs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 982 int *name; 983 u_int namelen; 984 void *oldp; 985 size_t *oldlenp; 986 void *newp; 987 size_t newlen; 988 struct proc *p; 989 { 990 return (EOPNOTSUPP); 991 } 992 993 /* 994 * Write a superblock and associated information back to disk. 995 */ 996 int 997 ext2fs_sbupdate(mp, waitfor) 998 struct ufsmount *mp; 999 int waitfor; 1000 { 1001 register struct m_ext2fs *fs = mp->um_e2fs; 1002 register struct buf *bp; 1003 int error = 0; 1004 1005 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0); 1006 e2fs_sbsave(&fs->e2fs, (struct ext2fs*)bp->b_data); 1007 if (waitfor == MNT_WAIT) 1008 error = bwrite(bp); 1009 else 1010 bawrite(bp); 1011 return (error); 1012 } 1013 1014 int 1015 ext2fs_cgupdate(mp, waitfor) 1016 struct ufsmount *mp; 1017 int waitfor; 1018 { 1019 register struct m_ext2fs *fs = mp->um_e2fs; 1020 register struct buf *bp; 1021 int i, error = 0, allerror = 0; 1022 1023 allerror = ext2fs_sbupdate(mp, waitfor); 1024 for (i = 0; i < fs->e2fs_ngdb; i++) { 1025 bp = getblk(mp->um_devvp, fsbtodb(fs, ((fs->e2fs_bsize>1024)?0:1)+i+1), 1026 fs->e2fs_bsize, 0, 0); 1027 e2fs_cgsave(&fs->e2fs_gd[i* fs->e2fs_bsize / sizeof(struct ext2_gd)], 1028 (struct ext2_gd*)bp->b_data, fs->e2fs_bsize); 1029 if (waitfor == MNT_WAIT) 1030 error = bwrite(bp); 1031 else 1032 bawrite(bp); 1033 } 1034 1035 if (!allerror && error) 1036 allerror = error; 1037 return (allerror); 1038 } 1039 1040 static int 1041 ext2fs_checksb(fs, ronly) 1042 struct ext2fs *fs; 1043 int ronly; 1044 { 1045 if (fs2h16(fs->e2fs_magic) != E2FS_MAGIC) { 1046 return (EIO); /* XXX needs translation */ 1047 } 1048 if (fs2h32(fs->e2fs_rev) > E2FS_REV1) { 1049 #ifdef DIAGNOSTIC 1050 printf("Ext2 fs: unsupported revision number: %x\n", 1051 fs2h32(fs->e2fs_rev)); 1052 #endif 1053 return (EIO); /* XXX needs translation */ 1054 } 1055 if (fs2h32(fs->e2fs_log_bsize) > 2) { /* block size = 1024|2048|4096 */ 1056 #ifdef DIAGNOSTIC 1057 printf("Ext2 fs: bad block size: %d (expected <=2 for ext2 fs)\n", 1058 fs2h32(fs->e2fs_log_bsize)); 1059 #endif 1060 return (EIO); /* XXX needs translation */ 1061 } 1062 if (fs2h32(fs->e2fs_rev) > E2FS_REV0) { 1063 if (fs2h32(fs->e2fs_features_incompat) & 1064 ~EXT2F_INCOMPAT_SUPP) { 1065 printf("Ext2 fs: unsupported optionnal feature\n"); 1066 return (EIO); /* XXX needs translation */ 1067 } 1068 if (!ronly && fs2h32(fs->e2fs_features_rocompat) & 1069 ~EXT2F_ROCOMPAT_SUPP) { 1070 return (EROFS); /* XXX needs translation */ 1071 } 1072 } 1073 return (0); 1074 } 1075
Indexes created Thu Sep 25 16:09:42 GMT 2025