Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/fs/ext2fs/ext2_vfsops.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /*- 2 * modified for EXT2FS support in Lites 1.1 3 * 4 * Aug 1995, Godmar Back (gback@cs.utah.edu) 5 * University of Utah, Department of Computer Science 6 */ 7 /*- 8 * Copyright (c) 1989, 1991, 1993, 1994 9 * The Regents of the University of California. All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 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 * @(#)ffs_vfsops.c 8.8 (Berkeley) 4/18/94 36 * $FreeBSD: releng/9.0/sys/fs/ext2fs/ext2_vfsops.c 222167 2011-05-22 01:07:54Z rmacklem $ 37 */ 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/namei.h> 42 #include <sys/priv.h> 43 #include <sys/proc.h> 44 #include <sys/kernel.h> 45 #include <sys/vnode.h> 46 #include <sys/mount.h> 47 #include <sys/bio.h> 48 #include <sys/buf.h> 49 #include <sys/conf.h> 50 #include <sys/fcntl.h> 51 #include <sys/malloc.h> 52 #include <sys/stat.h> 53 #include <sys/mutex.h> 54 55 #include <geom/geom.h> 56 #include <geom/geom_vfs.h> 57 58 #include <fs/ext2fs/ext2_mount.h> 59 #include <fs/ext2fs/inode.h> 60 61 #include <fs/ext2fs/fs.h> 62 #include <fs/ext2fs/ext2fs.h> 63 #include <fs/ext2fs/ext2_dinode.h> 64 #include <fs/ext2fs/ext2_extern.h> 65 66 static int ext2_flushfiles(struct mount *mp, int flags, struct thread *td); 67 static int ext2_mountfs(struct vnode *, struct mount *); 68 static int ext2_reload(struct mount *mp, struct thread *td); 69 static int ext2_sbupdate(struct ext2mount *, int); 70 static int ext2_cgupdate(struct ext2mount *, int); 71 static vfs_unmount_t ext2_unmount; 72 static vfs_root_t ext2_root; 73 static vfs_statfs_t ext2_statfs; 74 static vfs_sync_t ext2_sync; 75 static vfs_vget_t ext2_vget; 76 static vfs_fhtovp_t ext2_fhtovp; 77 static vfs_mount_t ext2_mount; 78 79 MALLOC_DEFINE(M_EXT2NODE, "ext2_node", "EXT2 vnode private part"); 80 static MALLOC_DEFINE(M_EXT2MNT, "ext2_mount", "EXT2 mount structure"); 81 82 static struct vfsops ext2fs_vfsops = { 83 .vfs_fhtovp = ext2_fhtovp, 84 .vfs_mount = ext2_mount, 85 .vfs_root = ext2_root, /* root inode via vget */ 86 .vfs_statfs = ext2_statfs, 87 .vfs_sync = ext2_sync, 88 .vfs_unmount = ext2_unmount, 89 .vfs_vget = ext2_vget, 90 }; 91 92 VFS_SET(ext2fs_vfsops, ext2fs, 0); 93 94 static int ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev, 95 int ronly); 96 static int compute_sb_data(struct vnode * devvp, 97 struct ext2fs * es, struct m_ext2fs * fs); 98 99 static const char *ext2_opts[] = { "acls", "async", "noatime", "noclusterr", 100 "noclusterw", "noexec", "export", "force", "from", "multilabel", 101 "suiddir", "nosymfollow", "sync", "union", NULL }; 102 103 /* 104 * VFS Operations. 105 * 106 * mount system call 107 */ 108 static int 109 ext2_mount(struct mount *mp) 110 { 111 struct vfsoptlist *opts; 112 struct vnode *devvp; 113 struct thread *td; 114 struct ext2mount *ump = 0; 115 struct m_ext2fs *fs; 116 struct nameidata nd, *ndp = &nd; 117 accmode_t accmode; 118 char *path, *fspec; 119 int error, flags, len; 120 121 td = curthread; 122 opts = mp->mnt_optnew; 123 124 if (vfs_filteropt(opts, ext2_opts)) 125 return (EINVAL); 126 127 vfs_getopt(opts, "fspath", (void **)&path, NULL); 128 /* Double-check the length of path.. */ 129 if (strlen(path) >= MAXMNTLEN - 1) 130 return (ENAMETOOLONG); 131 132 fspec = NULL; 133 error = vfs_getopt(opts, "from", (void **)&fspec, &len); 134 if (!error && fspec[len - 1] != '\0') 135 return (EINVAL); 136 137 /* 138 * If updating, check whether changing from read-only to 139 * read/write; if there is no device name, that's all we do. 140 */ 141 if (mp->mnt_flag & MNT_UPDATE) { 142 ump = VFSTOEXT2(mp); 143 fs = ump->um_e2fs; 144 error = 0; 145 if (fs->e2fs_ronly == 0 && 146 vfs_flagopt(opts, "ro", NULL, 0)) { 147 error = VFS_SYNC(mp, MNT_WAIT); 148 if (error) 149 return (error); 150 flags = WRITECLOSE; 151 if (mp->mnt_flag & MNT_FORCE) 152 flags |= FORCECLOSE; 153 error = ext2_flushfiles(mp, flags, td); 154 if ( error == 0 && fs->e2fs_wasvalid && ext2_cgupdate(ump, MNT_WAIT) == 0) { 155 fs->e2fs->e2fs_state |= E2FS_ISCLEAN; 156 ext2_sbupdate(ump, MNT_WAIT); 157 } 158 fs->e2fs_ronly = 1; 159 vfs_flagopt(opts, "ro", &mp->mnt_flag, MNT_RDONLY); 160 DROP_GIANT(); 161 g_topology_lock(); 162 g_access(ump->um_cp, 0, -1, 0); 163 g_topology_unlock(); 164 PICKUP_GIANT(); 165 } 166 if (!error && (mp->mnt_flag & MNT_RELOAD)) 167 error = ext2_reload(mp, td); 168 if (error) 169 return (error); 170 devvp = ump->um_devvp; 171 if (fs->e2fs_ronly && !vfs_flagopt(opts, "ro", NULL, 0)) { 172 if (ext2_check_sb_compat(fs->e2fs, devvp->v_rdev, 0)) 173 return (EPERM); 174 175 /* 176 * If upgrade to read-write by non-root, then verify 177 * that user has necessary permissions on the device. 178 */ 179 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 180 error = VOP_ACCESS(devvp, VREAD | VWRITE, 181 td->td_ucred, td); 182 if (error) 183 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 184 if (error) { 185 VOP_UNLOCK(devvp, 0); 186 return (error); 187 } 188 VOP_UNLOCK(devvp, 0); 189 DROP_GIANT(); 190 g_topology_lock(); 191 error = g_access(ump->um_cp, 0, 1, 0); 192 g_topology_unlock(); 193 PICKUP_GIANT(); 194 if (error) 195 return (error); 196 197 if ((fs->e2fs->e2fs_state & E2FS_ISCLEAN) == 0 || 198 (fs->e2fs->e2fs_state & E2FS_ERRORS)) { 199 if (mp->mnt_flag & MNT_FORCE) { 200 printf( 201 "WARNING: %s was not properly dismounted\n", fs->e2fs_fsmnt); 202 } else { 203 printf( 204 "WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n", 205 fs->e2fs_fsmnt); 206 return (EPERM); 207 } 208 } 209 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN; 210 (void)ext2_cgupdate(ump, MNT_WAIT); 211 fs->e2fs_ronly = 0; 212 MNT_ILOCK(mp); 213 mp->mnt_flag &= ~MNT_RDONLY; 214 MNT_IUNLOCK(mp); 215 } 216 if (vfs_flagopt(opts, "export", NULL, 0)) { 217 /* Process export requests in vfs_mount.c. */ 218 return (error); 219 } 220 } 221 222 /* 223 * Not an update, or updating the name: look up the name 224 * and verify that it refers to a sensible disk device. 225 */ 226 if (fspec == NULL) 227 return (EINVAL); 228 NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec, td); 229 if ((error = namei(ndp)) != 0) 230 return (error); 231 NDFREE(ndp, NDF_ONLY_PNBUF); 232 devvp = ndp->ni_vp; 233 234 if (!vn_isdisk(devvp, &error)) { 235 vput(devvp); 236 return (error); 237 } 238 239 /* 240 * If mount by non-root, then verify that user has necessary 241 * permissions on the device. 242 * 243 * XXXRW: VOP_ACCESS() enough? 244 */ 245 accmode = VREAD; 246 if ((mp->mnt_flag & MNT_RDONLY) == 0) 247 accmode |= VWRITE; 248 error = VOP_ACCESS(devvp, accmode, td->td_ucred, td); 249 if (error) 250 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 251 if (error) { 252 vput(devvp); 253 return (error); 254 } 255 256 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 257 error = ext2_mountfs(devvp, mp); 258 } else { 259 if (devvp != ump->um_devvp) { 260 vput(devvp); 261 return (EINVAL); /* needs translation */ 262 } else 263 vput(devvp); 264 } 265 if (error) { 266 vrele(devvp); 267 return (error); 268 } 269 ump = VFSTOEXT2(mp); 270 fs = ump->um_e2fs; 271 272 /* 273 * Note that this strncpy() is ok because of a check at the start 274 * of ext2_mount(). 275 */ 276 strncpy(fs->e2fs_fsmnt, path, MAXMNTLEN); 277 fs->e2fs_fsmnt[MAXMNTLEN - 1] = '\0'; 278 vfs_mountedfrom(mp, fspec); 279 return (0); 280 } 281 282 static int 283 ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev, int ronly) 284 { 285 286 if (es->e2fs_magic != E2FS_MAGIC) { 287 printf("ext2fs: %s: wrong magic number %#x (expected %#x)\n", 288 devtoname(dev), es->e2fs_magic, E2FS_MAGIC); 289 return (1); 290 } 291 if (es->e2fs_rev > E2FS_REV0) { 292 if (es->e2fs_features_incompat & ~EXT2F_INCOMPAT_SUPP) { 293 printf( 294 "WARNING: mount of %s denied due to unsupported optional features\n", 295 devtoname(dev)); 296 return (1); 297 } 298 if (!ronly && 299 (es->e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP)) { 300 printf("WARNING: R/W mount of %s denied due to " 301 "unsupported optional features\n", devtoname(dev)); 302 return (1); 303 } 304 } 305 return (0); 306 } 307 308 /* 309 * This computes the fields of the ext2_sb_info structure from the 310 * data in the ext2_super_block structure read in. 311 */ 312 static int 313 compute_sb_data(struct vnode *devvp, struct ext2fs *es, 314 struct m_ext2fs *fs) 315 { 316 int db_count, error; 317 int i; 318 int logic_sb_block = 1; /* XXX for now */ 319 struct buf *bp; 320 321 fs->e2fs_bsize = EXT2_MIN_BLOCK_SIZE << es->e2fs_log_bsize; 322 fs->e2fs_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->e2fs_log_bsize; 323 fs->e2fs_fsbtodb = es->e2fs_log_bsize + 1; 324 fs->e2fs_qbmask = fs->e2fs_bsize - 1; 325 fs->e2fs_blocksize_bits = es->e2fs_log_bsize + 10; 326 fs->e2fs_fsize = EXT2_MIN_FRAG_SIZE << es->e2fs_log_fsize; 327 if (fs->e2fs_fsize) 328 fs->e2fs_fpb = fs->e2fs_bsize / fs->e2fs_fsize; 329 fs->e2fs_bpg = es->e2fs_bpg; 330 fs->e2fs_fpg = es->e2fs_fpg; 331 fs->e2fs_ipg = es->e2fs_ipg; 332 if (es->e2fs_rev == E2FS_REV0) { 333 fs->e2fs_first_inode = EXT2_FIRSTINO; 334 fs->e2fs_isize = E2FS_REV0_INODE_SIZE ; 335 } else { 336 fs->e2fs_first_inode = es->e2fs_first_ino; 337 fs->e2fs_isize = es->e2fs_inode_size; 338 339 /* 340 * Simple sanity check for superblock inode size value. 341 */ 342 if (fs->e2fs_isize < E2FS_REV0_INODE_SIZE || 343 fs->e2fs_isize > fs->e2fs_bsize || 344 (fs->e2fs_isize & (fs->e2fs_isize - 1)) != 0) { 345 printf("EXT2-fs: invalid inode size %d\n", 346 fs->e2fs_isize); 347 return (EIO); 348 } 349 } 350 fs->e2fs_ipb = fs->e2fs_bsize / EXT2_INODE_SIZE(fs); 351 fs->e2fs_itpg = fs->e2fs_ipg /fs->e2fs_ipb; 352 fs->e2fs_descpb = fs->e2fs_bsize / sizeof (struct ext2_gd); 353 /* s_resuid / s_resgid ? */ 354 fs->e2fs_gcount = (es->e2fs_bcount - es->e2fs_first_dblock + 355 EXT2_BLOCKS_PER_GROUP(fs) - 1) / EXT2_BLOCKS_PER_GROUP(fs); 356 db_count = (fs->e2fs_gcount + EXT2_DESC_PER_BLOCK(fs) - 1) / 357 EXT2_DESC_PER_BLOCK(fs); 358 fs->e2fs_gdbcount = db_count; 359 fs->e2fs_gd = malloc(db_count * fs->e2fs_bsize, 360 M_EXT2MNT, M_WAITOK); 361 fs->e2fs_contigdirs = malloc(fs->e2fs_gcount * sizeof(*fs->e2fs_contigdirs), 362 M_EXT2MNT, M_WAITOK); 363 364 /* 365 * Adjust logic_sb_block. 366 * Godmar thinks: if the blocksize is greater than 1024, then 367 * the superblock is logically part of block zero. 368 */ 369 if(fs->e2fs_bsize > SBSIZE) 370 logic_sb_block = 0; 371 for (i = 0; i < db_count; i++) { 372 error = bread(devvp , 373 fsbtodb(fs, logic_sb_block + i + 1 ), 374 fs->e2fs_bsize, NOCRED, &bp); 375 if (error) { 376 free(fs->e2fs_gd, M_EXT2MNT); 377 brelse(bp); 378 return (error); 379 } 380 e2fs_cgload((struct ext2_gd *)bp->b_data, 381 &fs->e2fs_gd[ 382 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 383 fs->e2fs_bsize); 384 brelse(bp); 385 bp = NULL; 386 } 387 fs->e2fs_total_dir = 0; 388 for (i=0; i < fs->e2fs_gcount; i++){ 389 fs->e2fs_total_dir += fs->e2fs_gd[i].ext2bgd_ndirs; 390 fs->e2fs_contigdirs[i] = 0; 391 } 392 if (es->e2fs_rev == E2FS_REV0 || 393 (es->e2fs_features_rocompat & EXT2F_ROCOMPAT_LARGEFILE) == 0) 394 fs->e2fs_maxfilesize = 0x7fffffff; 395 else 396 fs->e2fs_maxfilesize = 0x7fffffffffffffff; 397 return (0); 398 } 399 400 /* 401 * Reload all incore data for a filesystem (used after running fsck on 402 * the root filesystem and finding things to fix). The filesystem must 403 * be mounted read-only. 404 * 405 * Things to do to update the mount: 406 * 1) invalidate all cached meta-data. 407 * 2) re-read superblock from disk. 408 * 3) re-read summary information from disk. 409 * 4) invalidate all inactive vnodes. 410 * 5) invalidate all cached file data. 411 * 6) re-read inode data for all active vnodes. 412 * XXX we are missing some steps, in particular # 3, this has to be reviewed. 413 */ 414 static int 415 ext2_reload(struct mount *mp, struct thread *td) 416 { 417 struct vnode *vp, *mvp, *devvp; 418 struct inode *ip; 419 struct buf *bp; 420 struct ext2fs *es; 421 struct m_ext2fs *fs; 422 int error; 423 424 if ((mp->mnt_flag & MNT_RDONLY) == 0) 425 return (EINVAL); 426 /* 427 * Step 1: invalidate all cached meta-data. 428 */ 429 devvp = VFSTOEXT2(mp)->um_devvp; 430 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 431 if (vinvalbuf(devvp, 0, 0, 0) != 0) 432 panic("ext2_reload: dirty1"); 433 VOP_UNLOCK(devvp, 0); 434 435 /* 436 * Step 2: re-read superblock from disk. 437 * constants have been adjusted for ext2 438 */ 439 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 440 return (error); 441 es = (struct ext2fs *)bp->b_data; 442 if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) { 443 brelse(bp); 444 return (EIO); /* XXX needs translation */ 445 } 446 fs = VFSTOEXT2(mp)->um_e2fs; 447 bcopy(bp->b_data, fs->e2fs, sizeof(struct ext2fs)); 448 449 if((error = compute_sb_data(devvp, es, fs)) != 0) { 450 brelse(bp); 451 return (error); 452 } 453 #ifdef UNKLAR 454 if (fs->fs_sbsize < SBSIZE) 455 bp->b_flags |= B_INVAL; 456 #endif 457 brelse(bp); 458 459 loop: 460 MNT_ILOCK(mp); 461 MNT_VNODE_FOREACH(vp, mp, mvp) { 462 VI_LOCK(vp); 463 if (vp->v_iflag & VI_DOOMED) { 464 VI_UNLOCK(vp); 465 continue; 466 } 467 MNT_IUNLOCK(mp); 468 /* 469 * Step 4: invalidate all cached file data. 470 */ 471 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) { 472 MNT_VNODE_FOREACH_ABORT(mp, mvp); 473 goto loop; 474 } 475 if (vinvalbuf(vp, 0, 0, 0)) 476 panic("ext2_reload: dirty2"); 477 478 /* 479 * Step 5: re-read inode data for all active vnodes. 480 */ 481 ip = VTOI(vp); 482 error = bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), 483 (int)fs->e2fs_bsize, NOCRED, &bp); 484 if (error) { 485 VOP_UNLOCK(vp, 0); 486 vrele(vp); 487 MNT_VNODE_FOREACH_ABORT(mp, mvp); 488 return (error); 489 } 490 ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data + 491 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)), ip); 492 brelse(bp); 493 VOP_UNLOCK(vp, 0); 494 vrele(vp); 495 MNT_ILOCK(mp); 496 } 497 MNT_IUNLOCK(mp); 498 return (0); 499 } 500 501 /* 502 * Common code for mount and mountroot. 503 */ 504 static int 505 ext2_mountfs(struct vnode *devvp, struct mount *mp) 506 { 507 struct ext2mount *ump; 508 struct buf *bp; 509 struct m_ext2fs *fs; 510 struct ext2fs *es; 511 struct cdev *dev = devvp->v_rdev; 512 struct g_consumer *cp; 513 struct bufobj *bo; 514 int error; 515 int ronly; 516 517 ronly = vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0); 518 /* XXX: use VOP_ACESS to check FS perms */ 519 DROP_GIANT(); 520 g_topology_lock(); 521 error = g_vfs_open(devvp, &cp, "ext2fs", ronly ? 0 : 1); 522 g_topology_unlock(); 523 PICKUP_GIANT(); 524 VOP_UNLOCK(devvp, 0); 525 if (error) 526 return (error); 527 528 /* XXX: should we check for some sectorsize or 512 instead? */ 529 if (((SBSIZE % cp->provider->sectorsize) != 0) || 530 (SBSIZE < cp->provider->sectorsize)) { 531 DROP_GIANT(); 532 g_topology_lock(); 533 g_vfs_close(cp); 534 g_topology_unlock(); 535 PICKUP_GIANT(); 536 return (EINVAL); 537 } 538 539 bo = &devvp->v_bufobj; 540 bo->bo_private = cp; 541 bo->bo_ops = g_vfs_bufops; 542 if (devvp->v_rdev->si_iosize_max != 0) 543 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max; 544 if (mp->mnt_iosize_max > MAXPHYS) 545 mp->mnt_iosize_max = MAXPHYS; 546 547 bp = NULL; 548 ump = NULL; 549 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 550 goto out; 551 es = (struct ext2fs *)bp->b_data; 552 if (ext2_check_sb_compat(es, dev, ronly) != 0) { 553 error = EINVAL; /* XXX needs translation */ 554 goto out; 555 } 556 if ((es->e2fs_state & E2FS_ISCLEAN) == 0 || 557 (es->e2fs_state & E2FS_ERRORS)) { 558 if (ronly || (mp->mnt_flag & MNT_FORCE)) { 559 printf( 560 "WARNING: Filesystem was not properly dismounted\n"); 561 } else { 562 printf( 563 "WARNING: R/W mount denied. Filesystem is not clean - run fsck\n"); 564 error = EPERM; 565 goto out; 566 } 567 } 568 ump = malloc(sizeof *ump, M_EXT2MNT, M_WAITOK); 569 bzero((caddr_t)ump, sizeof *ump); 570 571 /* 572 * I don't know whether this is the right strategy. Note that 573 * we dynamically allocate both an ext2_sb_info and an ext2_super_block 574 * while Linux keeps the super block in a locked buffer. 575 */ 576 ump->um_e2fs = malloc(sizeof(struct m_ext2fs), 577 M_EXT2MNT, M_WAITOK); 578 ump->um_e2fs->e2fs = malloc(sizeof(struct ext2fs), 579 M_EXT2MNT, M_WAITOK); 580 mtx_init(EXT2_MTX(ump), "EXT2FS", "EXT2FS Lock", MTX_DEF); 581 bcopy(es, ump->um_e2fs->e2fs, (u_int)sizeof(struct ext2fs)); 582 if ((error = compute_sb_data(devvp, ump->um_e2fs->e2fs, ump->um_e2fs))) 583 goto out; 584 585 brelse(bp); 586 bp = NULL; 587 fs = ump->um_e2fs; 588 fs->e2fs_ronly = ronly; /* ronly is set according to mnt_flags */ 589 590 /* 591 * If the fs is not mounted read-only, make sure the super block is 592 * always written back on a sync(). 593 */ 594 fs->e2fs_wasvalid = fs->e2fs->e2fs_state & E2FS_ISCLEAN ? 1 : 0; 595 if (ronly == 0) { 596 fs->e2fs_fmod = 1; /* mark it modified */ 597 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN; /* set fs invalid */ 598 } 599 mp->mnt_data = ump; 600 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 601 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 602 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN; 603 MNT_ILOCK(mp); 604 mp->mnt_flag |= MNT_LOCAL; 605 MNT_IUNLOCK(mp); 606 ump->um_mountp = mp; 607 ump->um_dev = dev; 608 ump->um_devvp = devvp; 609 ump->um_bo = &devvp->v_bufobj; 610 ump->um_cp = cp; 611 612 /* 613 * Setting those two parameters allowed us to use 614 * ufs_bmap w/o changse! 615 */ 616 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs); 617 ump->um_bptrtodb = fs->e2fs->e2fs_log_bsize + 1; 618 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs); 619 if (ronly == 0) 620 ext2_sbupdate(ump, MNT_WAIT); 621 /* 622 * Initialize filesystem stat information in mount struct. 623 */ 624 MNT_ILOCK(mp); 625 mp->mnt_kern_flag |= MNTK_MPSAFE | MNTK_LOOKUP_SHARED | 626 MNTK_EXTENDED_SHARED; 627 MNT_IUNLOCK(mp); 628 return (0); 629 out: 630 if (bp) 631 brelse(bp); 632 if (cp != NULL) { 633 DROP_GIANT(); 634 g_topology_lock(); 635 g_vfs_close(cp); 636 g_topology_unlock(); 637 PICKUP_GIANT(); 638 } 639 if (ump) { 640 mtx_destroy(EXT2_MTX(ump)); 641 free(ump->um_e2fs->e2fs_gd, M_EXT2MNT); 642 free(ump->um_e2fs->e2fs_contigdirs, M_EXT2MNT); 643 free(ump->um_e2fs->e2fs, M_EXT2MNT); 644 free(ump->um_e2fs, M_EXT2MNT); 645 free(ump, M_EXT2MNT); 646 mp->mnt_data = NULL; 647 } 648 return (error); 649 } 650 651 /* 652 * Unmount system call. 653 */ 654 static int 655 ext2_unmount(struct mount *mp, int mntflags) 656 { 657 struct ext2mount *ump; 658 struct m_ext2fs *fs; 659 int error, flags, ronly; 660 661 flags = 0; 662 if (mntflags & MNT_FORCE) { 663 if (mp->mnt_flag & MNT_ROOTFS) 664 return (EINVAL); 665 flags |= FORCECLOSE; 666 } 667 if ((error = ext2_flushfiles(mp, flags, curthread)) != 0) 668 return (error); 669 ump = VFSTOEXT2(mp); 670 fs = ump->um_e2fs; 671 ronly = fs->e2fs_ronly; 672 if (ronly == 0 && ext2_cgupdate(ump, MNT_WAIT) == 0) { 673 if (fs->e2fs_wasvalid) 674 fs->e2fs->e2fs_state |= E2FS_ISCLEAN; 675 ext2_sbupdate(ump, MNT_WAIT); 676 } 677 678 DROP_GIANT(); 679 g_topology_lock(); 680 g_vfs_close(ump->um_cp); 681 g_topology_unlock(); 682 PICKUP_GIANT(); 683 vrele(ump->um_devvp); 684 free(fs->e2fs_gd, M_EXT2MNT); 685 free(fs->e2fs_contigdirs, M_EXT2MNT); 686 free(fs->e2fs, M_EXT2MNT); 687 free(fs, M_EXT2MNT); 688 free(ump, M_EXT2MNT); 689 mp->mnt_data = NULL; 690 MNT_ILOCK(mp); 691 mp->mnt_flag &= ~MNT_LOCAL; 692 MNT_IUNLOCK(mp); 693 return (error); 694 } 695 696 /* 697 * Flush out all the files in a filesystem. 698 */ 699 static int 700 ext2_flushfiles(struct mount *mp, int flags, struct thread *td) 701 { 702 int error; 703 704 error = vflush(mp, 0, flags, td); 705 return (error); 706 } 707 /* 708 * Get file system statistics. 709 */ 710 int 711 ext2_statfs(struct mount *mp, struct statfs *sbp) 712 { 713 struct ext2mount *ump; 714 struct m_ext2fs *fs; 715 uint32_t overhead, overhead_per_group, ngdb; 716 int i, ngroups; 717 718 ump = VFSTOEXT2(mp); 719 fs = ump->um_e2fs; 720 if (fs->e2fs->e2fs_magic != E2FS_MAGIC) 721 panic("ext2fs_statvfs"); 722 723 /* 724 * Compute the overhead (FS structures) 725 */ 726 overhead_per_group = 727 1 /* block bitmap */ + 728 1 /* inode bitmap */ + 729 fs->e2fs_itpg; 730 overhead = fs->e2fs->e2fs_first_dblock + 731 fs->e2fs_gcount * overhead_per_group; 732 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 733 fs->e2fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) { 734 for (i = 0, ngroups = 0; i < fs->e2fs_gcount; i++) { 735 if (cg_has_sb(i)) 736 ngroups++; 737 } 738 } else { 739 ngroups = fs->e2fs_gcount; 740 } 741 ngdb = fs->e2fs_gdbcount; 742 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 743 fs->e2fs->e2fs_features_compat & EXT2F_COMPAT_RESIZE) 744 ngdb += fs->e2fs->e2fs_reserved_ngdb; 745 overhead += ngroups * (1 /* superblock */ + ngdb); 746 747 sbp->f_bsize = EXT2_FRAG_SIZE(fs); 748 sbp->f_iosize = EXT2_BLOCK_SIZE(fs); 749 sbp->f_blocks = fs->e2fs->e2fs_bcount - overhead; 750 sbp->f_bfree = fs->e2fs->e2fs_fbcount; 751 sbp->f_bavail = sbp->f_bfree - fs->e2fs->e2fs_rbcount; 752 sbp->f_files = fs->e2fs->e2fs_icount; 753 sbp->f_ffree = fs->e2fs->e2fs_ficount; 754 return (0); 755 } 756 757 /* 758 * Go through the disk queues to initiate sandbagged IO; 759 * go through the inodes to write those that have been modified; 760 * initiate the writing of the super block if it has been modified. 761 * 762 * Note: we are always called with the filesystem marked `MPBUSY'. 763 */ 764 static int 765 ext2_sync(struct mount *mp, int waitfor) 766 { 767 struct vnode *mvp, *vp; 768 struct thread *td; 769 struct inode *ip; 770 struct ext2mount *ump = VFSTOEXT2(mp); 771 struct m_ext2fs *fs; 772 int error, allerror = 0; 773 774 td = curthread; 775 fs = ump->um_e2fs; 776 if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) { /* XXX */ 777 printf("fs = %s\n", fs->e2fs_fsmnt); 778 panic("ext2_sync: rofs mod"); 779 } 780 781 /* 782 * Write back each (modified) inode. 783 */ 784 MNT_ILOCK(mp); 785 loop: 786 MNT_VNODE_FOREACH(vp, mp, mvp) { 787 VI_LOCK(vp); 788 if (vp->v_type == VNON || (vp->v_iflag & VI_DOOMED)) { 789 VI_UNLOCK(vp); 790 continue; 791 } 792 MNT_IUNLOCK(mp); 793 ip = VTOI(vp); 794 if ((ip->i_flag & 795 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 && 796 (vp->v_bufobj.bo_dirty.bv_cnt == 0 || 797 waitfor == MNT_LAZY)) { 798 VI_UNLOCK(vp); 799 MNT_ILOCK(mp); 800 continue; 801 } 802 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 803 if (error) { 804 MNT_ILOCK(mp); 805 if (error == ENOENT) { 806 MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp); 807 goto loop; 808 } 809 continue; 810 } 811 if ((error = VOP_FSYNC(vp, waitfor, td)) != 0) 812 allerror = error; 813 VOP_UNLOCK(vp, 0); 814 vrele(vp); 815 MNT_ILOCK(mp); 816 } 817 MNT_IUNLOCK(mp); 818 819 /* 820 * Force stale file system control information to be flushed. 821 */ 822 if (waitfor != MNT_LAZY) { 823 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); 824 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0) 825 allerror = error; 826 VOP_UNLOCK(ump->um_devvp, 0); 827 } 828 829 /* 830 * Write back modified superblock. 831 */ 832 if (fs->e2fs_fmod != 0) { 833 fs->e2fs_fmod = 0; 834 fs->e2fs->e2fs_wtime = time_second; 835 if ((error = ext2_cgupdate(ump, waitfor)) != 0) 836 allerror = error; 837 } 838 return (allerror); 839 } 840 841 /* 842 * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it 843 * in from disk. If it is in core, wait for the lock bit to clear, then 844 * return the inode locked. Detection and handling of mount points must be 845 * done by the calling routine. 846 */ 847 static int 848 ext2_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp) 849 { 850 struct m_ext2fs *fs; 851 struct inode *ip; 852 struct ext2mount *ump; 853 struct buf *bp; 854 struct vnode *vp; 855 struct cdev *dev; 856 struct thread *td; 857 int i, error; 858 int used_blocks; 859 860 td = curthread; 861 error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL); 862 if (error || *vpp != NULL) 863 return (error); 864 865 ump = VFSTOEXT2(mp); 866 dev = ump->um_dev; 867 868 /* 869 * If this malloc() is performed after the getnewvnode() 870 * it might block, leaving a vnode with a NULL v_data to be 871 * found by ext2_sync() if a sync happens to fire right then, 872 * which will cause a panic because ext2_sync() blindly 873 * dereferences vp->v_data (as well it should). 874 */ 875 ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO); 876 877 /* Allocate a new vnode/inode. */ 878 if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) { 879 *vpp = NULL; 880 free(ip, M_EXT2NODE); 881 return (error); 882 } 883 vp->v_data = ip; 884 ip->i_vnode = vp; 885 ip->i_e2fs = fs = ump->um_e2fs; 886 ip->i_ump = ump; 887 ip->i_number = ino; 888 889 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL); 890 error = insmntque(vp, mp); 891 if (error != 0) { 892 free(ip, M_EXT2NODE); 893 *vpp = NULL; 894 return (error); 895 } 896 error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL); 897 if (error || *vpp != NULL) 898 return (error); 899 900 /* Read in the disk contents for the inode, copy into the inode. */ 901 if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)), 902 (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) { 903 /* 904 * The inode does not contain anything useful, so it would 905 * be misleading to leave it on its hash chain. With mode 906 * still zero, it will be unlinked and returned to the free 907 * list by vput(). 908 */ 909 brelse(bp); 910 vput(vp); 911 *vpp = NULL; 912 return (error); 913 } 914 /* convert ext2 inode to dinode */ 915 ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data + EXT2_INODE_SIZE(fs) * 916 ino_to_fsbo(fs, ino)), ip); 917 ip->i_block_group = ino_to_cg(fs, ino); 918 ip->i_next_alloc_block = 0; 919 ip->i_next_alloc_goal = 0; 920 ip->i_prealloc_count = 0; 921 ip->i_prealloc_block = 0; 922 923 /* 924 * Now we want to make sure that block pointers for unused 925 * blocks are zeroed out - ext2_balloc depends on this 926 * although for regular files and directories only 927 */ 928 if(S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode)) { 929 used_blocks = (ip->i_size+fs->e2fs_bsize-1) / fs->e2fs_bsize; 930 for(i = used_blocks; i < EXT2_NDIR_BLOCKS; i++) 931 ip->i_db[i] = 0; 932 } 933 /* 934 ext2_print_inode(ip); 935 */ 936 bqrelse(bp); 937 938 /* 939 * Initialize the vnode from the inode, check for aliases. 940 * Note that the underlying vnode may have changed. 941 */ 942 if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) { 943 vput(vp); 944 *vpp = NULL; 945 return (error); 946 } 947 948 /* 949 * Finish inode initialization. 950 */ 951 952 /* 953 * Set up a generation number for this inode if it does not 954 * already have one. This should only happen on old filesystems. 955 */ 956 if (ip->i_gen == 0) { 957 ip->i_gen = random() / 2 + 1; 958 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) 959 ip->i_flag |= IN_MODIFIED; 960 } 961 *vpp = vp; 962 return (0); 963 } 964 965 /* 966 * File handle to vnode 967 * 968 * Have to be really careful about stale file handles: 969 * - check that the inode number is valid 970 * - call ext2_vget() to get the locked inode 971 * - check for an unallocated inode (i_mode == 0) 972 * - check that the given client host has export rights and return 973 * those rights via. exflagsp and credanonp 974 */ 975 static int 976 ext2_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp) 977 { 978 struct inode *ip; 979 struct ufid *ufhp; 980 struct vnode *nvp; 981 struct m_ext2fs *fs; 982 int error; 983 984 ufhp = (struct ufid *)fhp; 985 fs = VFSTOEXT2(mp)->um_e2fs; 986 if (ufhp->ufid_ino < EXT2_ROOTINO || 987 ufhp->ufid_ino > fs->e2fs_gcount * fs->e2fs->e2fs_ipg) 988 return (ESTALE); 989 990 error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp); 991 if (error) { 992 *vpp = NULLVP; 993 return (error); 994 } 995 ip = VTOI(nvp); 996 if (ip->i_mode == 0 || 997 ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) { 998 vput(nvp); 999 *vpp = NULLVP; 1000 return (ESTALE); 1001 } 1002 *vpp = nvp; 1003 vnode_create_vobject(*vpp, 0, curthread); 1004 return (0); 1005 } 1006 1007 /* 1008 * Write a superblock and associated information back to disk. 1009 */ 1010 static int 1011 ext2_sbupdate(struct ext2mount *mp, int waitfor) 1012 { 1013 struct m_ext2fs *fs = mp->um_e2fs; 1014 struct ext2fs *es = fs->e2fs; 1015 struct buf *bp; 1016 int error = 0; 1017 1018 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0, 0); 1019 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2fs)); 1020 if (waitfor == MNT_WAIT) 1021 error = bwrite(bp); 1022 else 1023 bawrite(bp); 1024 1025 /* 1026 * The buffers for group descriptors, inode bitmaps and block bitmaps 1027 * are not busy at this point and are (hopefully) written by the 1028 * usual sync mechanism. No need to write them here. 1029 */ 1030 return (error); 1031 } 1032 int 1033 ext2_cgupdate(struct ext2mount *mp, int waitfor) 1034 { 1035 struct m_ext2fs *fs = mp->um_e2fs; 1036 struct buf *bp; 1037 int i, error = 0, allerror = 0; 1038 1039 allerror = ext2_sbupdate(mp, waitfor); 1040 for (i = 0; i < fs->e2fs_gdbcount; i++) { 1041 bp = getblk(mp->um_devvp, fsbtodb(fs, 1042 fs->e2fs->e2fs_first_dblock + 1043 1 /* superblock */ + i), fs->e2fs_bsize, 0, 0, 0); 1044 e2fs_cgsave(&fs->e2fs_gd[ 1045 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 1046 (struct ext2_gd *)bp->b_data, fs->e2fs_bsize); 1047 if (waitfor == MNT_WAIT) 1048 error = bwrite(bp); 1049 else 1050 bawrite(bp); 1051 } 1052 1053 if (!allerror && error) 1054 allerror = error; 1055 return (allerror); 1056 } 1057 /* 1058 * Return the root of a filesystem. 1059 */ 1060 static int 1061 ext2_root(struct mount *mp, int flags, struct vnode **vpp) 1062 { 1063 struct vnode *nvp; 1064 int error; 1065 1066 error = VFS_VGET(mp, EXT2_ROOTINO, LK_EXCLUSIVE, &nvp); 1067 if (error) 1068 return (error); 1069 *vpp = nvp; 1070 return (0); 1071 }
Cache object: a1ecdd6e3898f02b0116f7c176273dfe
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]