ext2_vfsops.c revision 261311
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: stable/10/sys/fs/ext2fs/ext2_vfsops.c 261311 2014-01-31 03:58:36Z pfg $ 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/endian.h> 51#include <sys/fcntl.h> 52#include <sys/malloc.h> 53#include <sys/stat.h> 54#include <sys/mutex.h> 55 56#include <geom/geom.h> 57#include <geom/geom_vfs.h> 58 59#include <fs/ext2fs/ext2_mount.h> 60#include <fs/ext2fs/inode.h> 61 62#include <fs/ext2fs/fs.h> 63#include <fs/ext2fs/ext2fs.h> 64#include <fs/ext2fs/ext2_dinode.h> 65#include <fs/ext2fs/ext2_extern.h> 66 67static int ext2_flushfiles(struct mount *mp, int flags, struct thread *td); 68static int ext2_mountfs(struct vnode *, struct mount *); 69static int ext2_reload(struct mount *mp, struct thread *td); 70static int ext2_sbupdate(struct ext2mount *, int); 71static int ext2_cgupdate(struct ext2mount *, int); 72static vfs_unmount_t ext2_unmount; 73static vfs_root_t ext2_root; 74static vfs_statfs_t ext2_statfs; 75static vfs_sync_t ext2_sync; 76static vfs_vget_t ext2_vget; 77static vfs_fhtovp_t ext2_fhtovp; 78static vfs_mount_t ext2_mount; 79 80MALLOC_DEFINE(M_EXT2NODE, "ext2_node", "EXT2 vnode private part"); 81static MALLOC_DEFINE(M_EXT2MNT, "ext2_mount", "EXT2 mount structure"); 82 83static struct vfsops ext2fs_vfsops = { 84 .vfs_fhtovp = ext2_fhtovp, 85 .vfs_mount = ext2_mount, 86 .vfs_root = ext2_root, /* root inode via vget */ 87 .vfs_statfs = ext2_statfs, 88 .vfs_sync = ext2_sync, 89 .vfs_unmount = ext2_unmount, 90 .vfs_vget = ext2_vget, 91}; 92 93VFS_SET(ext2fs_vfsops, ext2fs, 0); 94 95static int ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev, 96 int ronly); 97static int compute_sb_data(struct vnode * devvp, 98 struct ext2fs * es, struct m_ext2fs * fs); 99 100static const char *ext2_opts[] = { "acls", "async", "noatime", "noclusterr", 101 "noclusterw", "noexec", "export", "force", "from", "multilabel", 102 "suiddir", "nosymfollow", "sync", "union", NULL }; 103 104/* 105 * VFS Operations. 106 * 107 * mount system call 108 */ 109static int 110ext2_mount(struct mount *mp) 111{ 112 struct vfsoptlist *opts; 113 struct vnode *devvp; 114 struct thread *td; 115 struct ext2mount *ump = NULL; 116 struct m_ext2fs *fs; 117 struct nameidata nd, *ndp = &nd; 118 accmode_t accmode; 119 char *path, *fspec; 120 int error, flags, len; 121 122 td = curthread; 123 opts = mp->mnt_optnew; 124 125 if (vfs_filteropt(opts, ext2_opts)) 126 return (EINVAL); 127 128 vfs_getopt(opts, "fspath", (void **)&path, NULL); 129 /* Double-check the length of path.. */ 130 if (strlen(path) >= MAXMNTLEN) 131 return (ENAMETOOLONG); 132 133 fspec = NULL; 134 error = vfs_getopt(opts, "from", (void **)&fspec, &len); 135 if (!error && fspec[len - 1] != '\0') 136 return (EINVAL); 137 138 /* 139 * If updating, check whether changing from read-only to 140 * read/write; if there is no device name, that's all we do. 141 */ 142 if (mp->mnt_flag & MNT_UPDATE) { 143 ump = VFSTOEXT2(mp); 144 fs = ump->um_e2fs; 145 error = 0; 146 if (fs->e2fs_ronly == 0 && 147 vfs_flagopt(opts, "ro", NULL, 0)) { 148 error = VFS_SYNC(mp, MNT_WAIT); 149 if (error) 150 return (error); 151 flags = WRITECLOSE; 152 if (mp->mnt_flag & MNT_FORCE) 153 flags |= FORCECLOSE; 154 error = ext2_flushfiles(mp, flags, td); 155 if ( error == 0 && fs->e2fs_wasvalid && ext2_cgupdate(ump, MNT_WAIT) == 0) { 156 fs->e2fs->e2fs_state |= E2FS_ISCLEAN; 157 ext2_sbupdate(ump, MNT_WAIT); 158 } 159 fs->e2fs_ronly = 1; 160 vfs_flagopt(opts, "ro", &mp->mnt_flag, MNT_RDONLY); 161 DROP_GIANT(); 162 g_topology_lock(); 163 g_access(ump->um_cp, 0, -1, 0); 164 g_topology_unlock(); 165 PICKUP_GIANT(); 166 } 167 if (!error && (mp->mnt_flag & MNT_RELOAD)) 168 error = ext2_reload(mp, td); 169 if (error) 170 return (error); 171 devvp = ump->um_devvp; 172 if (fs->e2fs_ronly && !vfs_flagopt(opts, "ro", NULL, 0)) { 173 if (ext2_check_sb_compat(fs->e2fs, devvp->v_rdev, 0)) 174 return (EPERM); 175 176 /* 177 * If upgrade to read-write by non-root, then verify 178 * that user has necessary permissions on the device. 179 */ 180 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 181 error = VOP_ACCESS(devvp, VREAD | VWRITE, 182 td->td_ucred, td); 183 if (error) 184 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 185 if (error) { 186 VOP_UNLOCK(devvp, 0); 187 return (error); 188 } 189 VOP_UNLOCK(devvp, 0); 190 DROP_GIANT(); 191 g_topology_lock(); 192 error = g_access(ump->um_cp, 0, 1, 0); 193 g_topology_unlock(); 194 PICKUP_GIANT(); 195 if (error) 196 return (error); 197 198 if ((fs->e2fs->e2fs_state & E2FS_ISCLEAN) == 0 || 199 (fs->e2fs->e2fs_state & E2FS_ERRORS)) { 200 if (mp->mnt_flag & MNT_FORCE) { 201 printf( 202"WARNING: %s was not properly dismounted\n", fs->e2fs_fsmnt); 203 } else { 204 printf( 205"WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n", 206 fs->e2fs_fsmnt); 207 return (EPERM); 208 } 209 } 210 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN; 211 (void)ext2_cgupdate(ump, MNT_WAIT); 212 fs->e2fs_ronly = 0; 213 MNT_ILOCK(mp); 214 mp->mnt_flag &= ~MNT_RDONLY; 215 MNT_IUNLOCK(mp); 216 } 217 if (vfs_flagopt(opts, "export", NULL, 0)) { 218 /* Process export requests in vfs_mount.c. */ 219 return (error); 220 } 221 } 222 223 /* 224 * Not an update, or updating the name: look up the name 225 * and verify that it refers to a sensible disk device. 226 */ 227 if (fspec == NULL) 228 return (EINVAL); 229 NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec, td); 230 if ((error = namei(ndp)) != 0) 231 return (error); 232 NDFREE(ndp, NDF_ONLY_PNBUF); 233 devvp = ndp->ni_vp; 234 235 if (!vn_isdisk(devvp, &error)) { 236 vput(devvp); 237 return (error); 238 } 239 240 /* 241 * If mount by non-root, then verify that user has necessary 242 * permissions on the device. 243 * 244 * XXXRW: VOP_ACCESS() enough? 245 */ 246 accmode = VREAD; 247 if ((mp->mnt_flag & MNT_RDONLY) == 0) 248 accmode |= VWRITE; 249 error = VOP_ACCESS(devvp, accmode, td->td_ucred, td); 250 if (error) 251 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 252 if (error) { 253 vput(devvp); 254 return (error); 255 } 256 257 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 258 error = ext2_mountfs(devvp, mp); 259 } else { 260 if (devvp != ump->um_devvp) { 261 vput(devvp); 262 return (EINVAL); /* needs translation */ 263 } else 264 vput(devvp); 265 } 266 if (error) { 267 vrele(devvp); 268 return (error); 269 } 270 ump = VFSTOEXT2(mp); 271 fs = ump->um_e2fs; 272 273 /* 274 * Note that this strncpy() is ok because of a check at the start 275 * of ext2_mount(). 276 */ 277 strncpy(fs->e2fs_fsmnt, path, MAXMNTLEN); 278 fs->e2fs_fsmnt[MAXMNTLEN - 1] = '\0'; 279 vfs_mountedfrom(mp, fspec); 280 return (0); 281} 282 283static int 284ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev, int ronly) 285{ 286 287 if (es->e2fs_magic != E2FS_MAGIC) { 288 printf("ext2fs: %s: wrong magic number %#x (expected %#x)\n", 289 devtoname(dev), es->e2fs_magic, E2FS_MAGIC); 290 return (1); 291 } 292 if (es->e2fs_rev > E2FS_REV0) { 293 if (es->e2fs_features_incompat & ~EXT2F_INCOMPAT_SUPP) { 294 printf( 295"WARNING: mount of %s denied due to unsupported optional features\n", 296 devtoname(dev)); 297 return (1); 298 } 299 if (!ronly && 300 (es->e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP)) { 301 printf("WARNING: R/W mount of %s denied due to " 302 "unsupported optional features\n", devtoname(dev)); 303 return (1); 304 } 305 } 306 return (0); 307} 308 309/* 310 * This computes the fields of the ext2_sb_info structure from the 311 * data in the ext2_super_block structure read in. 312 */ 313static int 314compute_sb_data(struct vnode *devvp, struct ext2fs *es, 315 struct m_ext2fs *fs) 316{ 317 int db_count, error; 318 int i; 319 int logic_sb_block = 1; /* XXX for now */ 320 struct buf *bp; 321 uint32_t e2fs_descpb; 322 323 fs->e2fs_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->e2fs_log_bsize; 324 fs->e2fs_bsize = 1U << fs->e2fs_bshift; 325 fs->e2fs_fsbtodb = es->e2fs_log_bsize + 1; 326 fs->e2fs_qbmask = fs->e2fs_bsize - 1; 327 fs->e2fs_fsize = EXT2_MIN_FRAG_SIZE << es->e2fs_log_fsize; 328 if (fs->e2fs_fsize) 329 fs->e2fs_fpb = fs->e2fs_bsize / fs->e2fs_fsize; 330 fs->e2fs_bpg = es->e2fs_bpg; 331 fs->e2fs_fpg = es->e2fs_fpg; 332 fs->e2fs_ipg = es->e2fs_ipg; 333 if (es->e2fs_rev == E2FS_REV0) { 334 fs->e2fs_isize = E2FS_REV0_INODE_SIZE ; 335 } else { 336 fs->e2fs_isize = es->e2fs_inode_size; 337 338 /* 339 * Simple sanity check for superblock inode size value. 340 */ 341 if (EXT2_INODE_SIZE(fs) < E2FS_REV0_INODE_SIZE || 342 EXT2_INODE_SIZE(fs) > fs->e2fs_bsize || 343 (fs->e2fs_isize & (fs->e2fs_isize - 1)) != 0) { 344 printf("ext2fs: invalid inode size %d\n", 345 fs->e2fs_isize); 346 return (EIO); 347 } 348 } 349 /* Check for extra isize in big inodes. */ 350 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_EXTRA_ISIZE) && 351 EXT2_INODE_SIZE(fs) < sizeof(struct ext2fs_dinode)) { 352 printf("ext2fs: no space for extra inode timestamps\n"); 353 return (EINVAL); 354 } 355 356 fs->e2fs_ipb = fs->e2fs_bsize / EXT2_INODE_SIZE(fs); 357 fs->e2fs_itpg = fs->e2fs_ipg /fs->e2fs_ipb; 358 /* s_resuid / s_resgid ? */ 359 fs->e2fs_gcount = (es->e2fs_bcount - es->e2fs_first_dblock + 360 EXT2_BLOCKS_PER_GROUP(fs) - 1) / EXT2_BLOCKS_PER_GROUP(fs); 361 e2fs_descpb = fs->e2fs_bsize / sizeof(struct ext2_gd); 362 db_count = (fs->e2fs_gcount + e2fs_descpb - 1) / e2fs_descpb; 363 fs->e2fs_gdbcount = db_count; 364 fs->e2fs_gd = malloc(db_count * fs->e2fs_bsize, 365 M_EXT2MNT, M_WAITOK); 366 fs->e2fs_contigdirs = malloc(fs->e2fs_gcount * 367 sizeof(*fs->e2fs_contigdirs), M_EXT2MNT, M_WAITOK); 368 369 /* 370 * Adjust logic_sb_block. 371 * Godmar thinks: if the blocksize is greater than 1024, then 372 * the superblock is logically part of block zero. 373 */ 374 if(fs->e2fs_bsize > SBSIZE) 375 logic_sb_block = 0; 376 for (i = 0; i < db_count; i++) { 377 error = bread(devvp , 378 fsbtodb(fs, logic_sb_block + i + 1 ), 379 fs->e2fs_bsize, NOCRED, &bp); 380 if (error) { 381 free(fs->e2fs_gd, M_EXT2MNT); 382 brelse(bp); 383 return (error); 384 } 385 e2fs_cgload((struct ext2_gd *)bp->b_data, 386 &fs->e2fs_gd[ 387 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 388 fs->e2fs_bsize); 389 brelse(bp); 390 bp = NULL; 391 } 392 fs->e2fs_total_dir = 0; 393 for (i=0; i < fs->e2fs_gcount; i++){ 394 fs->e2fs_total_dir += fs->e2fs_gd[i].ext2bgd_ndirs; 395 fs->e2fs_contigdirs[i] = 0; 396 } 397 if (es->e2fs_rev == E2FS_REV0 || 398 !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_LARGEFILE)) 399 fs->e2fs_maxfilesize = 0x7fffffff; 400 else { 401 fs->e2fs_maxfilesize = 0xffffffffffff; 402 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_HUGE_FILE)) 403 fs->e2fs_maxfilesize = 0x7fffffffffffffff; 404 } 405 if (es->e4fs_flags & E2FS_UNSIGNED_HASH) { 406 fs->e2fs_uhash = 3; 407 } else if ((es->e4fs_flags & E2FS_SIGNED_HASH) == 0) { 408#ifdef __CHAR_UNSIGNED__ 409 es->e4fs_flags |= E2FS_UNSIGNED_HASH; 410 fs->e2fs_uhash = 3; 411#else 412 es->e4fs_flags |= E2FS_SIGNED_HASH; 413#endif 414 } 415 416 return (0); 417} 418 419/* 420 * Reload all incore data for a filesystem (used after running fsck on 421 * the root filesystem and finding things to fix). The filesystem must 422 * be mounted read-only. 423 * 424 * Things to do to update the mount: 425 * 1) invalidate all cached meta-data. 426 * 2) re-read superblock from disk. 427 * 3) invalidate all cluster summary information. 428 * 4) invalidate all inactive vnodes. 429 * 5) invalidate all cached file data. 430 * 6) re-read inode data for all active vnodes. 431 * XXX we are missing some steps, in particular # 3, this has to be reviewed. 432 */ 433static int 434ext2_reload(struct mount *mp, struct thread *td) 435{ 436 struct vnode *vp, *mvp, *devvp; 437 struct inode *ip; 438 struct buf *bp; 439 struct ext2fs *es; 440 struct m_ext2fs *fs; 441 struct csum *sump; 442 int error, i; 443 int32_t *lp; 444 445 if ((mp->mnt_flag & MNT_RDONLY) == 0) 446 return (EINVAL); 447 /* 448 * Step 1: invalidate all cached meta-data. 449 */ 450 devvp = VFSTOEXT2(mp)->um_devvp; 451 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 452 if (vinvalbuf(devvp, 0, 0, 0) != 0) 453 panic("ext2_reload: dirty1"); 454 VOP_UNLOCK(devvp, 0); 455 456 /* 457 * Step 2: re-read superblock from disk. 458 * constants have been adjusted for ext2 459 */ 460 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 461 return (error); 462 es = (struct ext2fs *)bp->b_data; 463 if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) { 464 brelse(bp); 465 return (EIO); /* XXX needs translation */ 466 } 467 fs = VFSTOEXT2(mp)->um_e2fs; 468 bcopy(bp->b_data, fs->e2fs, sizeof(struct ext2fs)); 469 470 if((error = compute_sb_data(devvp, es, fs)) != 0) { 471 brelse(bp); 472 return (error); 473 } 474#ifdef UNKLAR 475 if (fs->fs_sbsize < SBSIZE) 476 bp->b_flags |= B_INVAL; 477#endif 478 brelse(bp); 479 480 /* 481 * Step 3: invalidate all cluster summary information. 482 */ 483 if (fs->e2fs_contigsumsize > 0) { 484 lp = fs->e2fs_maxcluster; 485 sump = fs->e2fs_clustersum; 486 for (i = 0; i < fs->e2fs_gcount; i++, sump++) { 487 *lp++ = fs->e2fs_contigsumsize; 488 sump->cs_init = 0; 489 bzero(sump->cs_sum, fs->e2fs_contigsumsize + 1); 490 } 491 } 492 493loop: 494 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 495 /* 496 * Step 4: invalidate all cached file data. 497 */ 498 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) { 499 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 500 goto loop; 501 } 502 if (vinvalbuf(vp, 0, 0, 0)) 503 panic("ext2_reload: dirty2"); 504 505 /* 506 * Step 5: re-read inode data for all active vnodes. 507 */ 508 ip = VTOI(vp); 509 error = bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), 510 (int)fs->e2fs_bsize, NOCRED, &bp); 511 if (error) { 512 VOP_UNLOCK(vp, 0); 513 vrele(vp); 514 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 515 return (error); 516 } 517 ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data + 518 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)), ip); 519 brelse(bp); 520 VOP_UNLOCK(vp, 0); 521 vrele(vp); 522 } 523 return (0); 524} 525 526/* 527 * Common code for mount and mountroot. 528 */ 529static int 530ext2_mountfs(struct vnode *devvp, struct mount *mp) 531{ 532 struct ext2mount *ump; 533 struct buf *bp; 534 struct m_ext2fs *fs; 535 struct ext2fs *es; 536 struct cdev *dev = devvp->v_rdev; 537 struct g_consumer *cp; 538 struct bufobj *bo; 539 struct csum *sump; 540 int error; 541 int ronly; 542 int i, size; 543 int32_t *lp; 544 int32_t e2fs_maxcontig; 545 546 ronly = vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0); 547 /* XXX: use VOP_ACESS to check FS perms */ 548 DROP_GIANT(); 549 g_topology_lock(); 550 error = g_vfs_open(devvp, &cp, "ext2fs", ronly ? 0 : 1); 551 g_topology_unlock(); 552 PICKUP_GIANT(); 553 VOP_UNLOCK(devvp, 0); 554 if (error) 555 return (error); 556 557 /* XXX: should we check for some sectorsize or 512 instead? */ 558 if (((SBSIZE % cp->provider->sectorsize) != 0) || 559 (SBSIZE < cp->provider->sectorsize)) { 560 DROP_GIANT(); 561 g_topology_lock(); 562 g_vfs_close(cp); 563 g_topology_unlock(); 564 PICKUP_GIANT(); 565 return (EINVAL); 566 } 567 568 bo = &devvp->v_bufobj; 569 bo->bo_private = cp; 570 bo->bo_ops = g_vfs_bufops; 571 if (devvp->v_rdev->si_iosize_max != 0) 572 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max; 573 if (mp->mnt_iosize_max > MAXPHYS) 574 mp->mnt_iosize_max = MAXPHYS; 575 576 bp = NULL; 577 ump = NULL; 578 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 579 goto out; 580 es = (struct ext2fs *)bp->b_data; 581 if (ext2_check_sb_compat(es, dev, ronly) != 0) { 582 error = EINVAL; /* XXX needs translation */ 583 goto out; 584 } 585 if ((es->e2fs_state & E2FS_ISCLEAN) == 0 || 586 (es->e2fs_state & E2FS_ERRORS)) { 587 if (ronly || (mp->mnt_flag & MNT_FORCE)) { 588 printf( 589"WARNING: Filesystem was not properly dismounted\n"); 590 } else { 591 printf( 592"WARNING: R/W mount denied. Filesystem is not clean - run fsck\n"); 593 error = EPERM; 594 goto out; 595 } 596 } 597 ump = malloc(sizeof(*ump), M_EXT2MNT, M_WAITOK | M_ZERO); 598 599 /* 600 * I don't know whether this is the right strategy. Note that 601 * we dynamically allocate both an ext2_sb_info and an ext2_super_block 602 * while Linux keeps the super block in a locked buffer. 603 */ 604 ump->um_e2fs = malloc(sizeof(struct m_ext2fs), 605 M_EXT2MNT, M_WAITOK); 606 ump->um_e2fs->e2fs = malloc(sizeof(struct ext2fs), 607 M_EXT2MNT, M_WAITOK); 608 mtx_init(EXT2_MTX(ump), "EXT2FS", "EXT2FS Lock", MTX_DEF); 609 bcopy(es, ump->um_e2fs->e2fs, (u_int)sizeof(struct ext2fs)); 610 if ((error = compute_sb_data(devvp, ump->um_e2fs->e2fs, ump->um_e2fs))) 611 goto out; 612 613 /* 614 * Calculate the maximum contiguous blocks and size of cluster summary 615 * array. In FFS this is done by newfs; however, the superblock 616 * in ext2fs doesn't have these variables, so we can calculate 617 * them here. 618 */ 619 e2fs_maxcontig = MAX(1, MAXPHYS / ump->um_e2fs->e2fs_bsize); 620 ump->um_e2fs->e2fs_contigsumsize = MIN(e2fs_maxcontig, EXT2_MAXCONTIG); 621 if (ump->um_e2fs->e2fs_contigsumsize > 0) { 622 size = ump->um_e2fs->e2fs_gcount * sizeof(int32_t); 623 ump->um_e2fs->e2fs_maxcluster = malloc(size, M_EXT2MNT, M_WAITOK); 624 size = ump->um_e2fs->e2fs_gcount * sizeof(struct csum); 625 ump->um_e2fs->e2fs_clustersum = malloc(size, M_EXT2MNT, M_WAITOK); 626 lp = ump->um_e2fs->e2fs_maxcluster; 627 sump = ump->um_e2fs->e2fs_clustersum; 628 for (i = 0; i < ump->um_e2fs->e2fs_gcount; i++, sump++) { 629 *lp++ = ump->um_e2fs->e2fs_contigsumsize; 630 sump->cs_init = 0; 631 sump->cs_sum = malloc((ump->um_e2fs->e2fs_contigsumsize + 1) * 632 sizeof(int32_t), M_EXT2MNT, M_WAITOK | M_ZERO); 633 } 634 } 635 636 brelse(bp); 637 bp = NULL; 638 fs = ump->um_e2fs; 639 fs->e2fs_ronly = ronly; /* ronly is set according to mnt_flags */ 640 641 /* 642 * If the fs is not mounted read-only, make sure the super block is 643 * always written back on a sync(). 644 */ 645 fs->e2fs_wasvalid = fs->e2fs->e2fs_state & E2FS_ISCLEAN ? 1 : 0; 646 if (ronly == 0) { 647 fs->e2fs_fmod = 1; /* mark it modified */ 648 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN; /* set fs invalid */ 649 } 650 mp->mnt_data = ump; 651 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 652 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 653 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN; 654 MNT_ILOCK(mp); 655 mp->mnt_flag |= MNT_LOCAL; 656 MNT_IUNLOCK(mp); 657 ump->um_mountp = mp; 658 ump->um_dev = dev; 659 ump->um_devvp = devvp; 660 ump->um_bo = &devvp->v_bufobj; 661 ump->um_cp = cp; 662 663 /* 664 * Setting those two parameters allowed us to use 665 * ufs_bmap w/o changse! 666 */ 667 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs); 668 ump->um_bptrtodb = fs->e2fs->e2fs_log_bsize + 1; 669 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs); 670 if (ronly == 0) 671 ext2_sbupdate(ump, MNT_WAIT); 672 /* 673 * Initialize filesystem stat information in mount struct. 674 */ 675 MNT_ILOCK(mp); 676 mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED; 677 MNT_IUNLOCK(mp); 678 return (0); 679out: 680 if (bp) 681 brelse(bp); 682 if (cp != NULL) { 683 DROP_GIANT(); 684 g_topology_lock(); 685 g_vfs_close(cp); 686 g_topology_unlock(); 687 PICKUP_GIANT(); 688 } 689 if (ump) { 690 mtx_destroy(EXT2_MTX(ump)); 691 free(ump->um_e2fs->e2fs_gd, M_EXT2MNT); 692 free(ump->um_e2fs->e2fs_contigdirs, M_EXT2MNT); 693 free(ump->um_e2fs->e2fs, M_EXT2MNT); 694 free(ump->um_e2fs, M_EXT2MNT); 695 free(ump, M_EXT2MNT); 696 mp->mnt_data = NULL; 697 } 698 return (error); 699} 700 701/* 702 * Unmount system call. 703 */ 704static int 705ext2_unmount(struct mount *mp, int mntflags) 706{ 707 struct ext2mount *ump; 708 struct m_ext2fs *fs; 709 struct csum *sump; 710 int error, flags, i, ronly; 711 712 flags = 0; 713 if (mntflags & MNT_FORCE) { 714 if (mp->mnt_flag & MNT_ROOTFS) 715 return (EINVAL); 716 flags |= FORCECLOSE; 717 } 718 if ((error = ext2_flushfiles(mp, flags, curthread)) != 0) 719 return (error); 720 ump = VFSTOEXT2(mp); 721 fs = ump->um_e2fs; 722 ronly = fs->e2fs_ronly; 723 if (ronly == 0 && ext2_cgupdate(ump, MNT_WAIT) == 0) { 724 if (fs->e2fs_wasvalid) 725 fs->e2fs->e2fs_state |= E2FS_ISCLEAN; 726 ext2_sbupdate(ump, MNT_WAIT); 727 } 728 729 DROP_GIANT(); 730 g_topology_lock(); 731 g_vfs_close(ump->um_cp); 732 g_topology_unlock(); 733 PICKUP_GIANT(); 734 vrele(ump->um_devvp); 735 sump = fs->e2fs_clustersum; 736 for (i = 0; i < fs->e2fs_gcount; i++, sump++) 737 free(sump->cs_sum, M_EXT2MNT); 738 free(fs->e2fs_clustersum, M_EXT2MNT); 739 free(fs->e2fs_maxcluster, M_EXT2MNT); 740 free(fs->e2fs_gd, M_EXT2MNT); 741 free(fs->e2fs_contigdirs, M_EXT2MNT); 742 free(fs->e2fs, M_EXT2MNT); 743 free(fs, M_EXT2MNT); 744 free(ump, M_EXT2MNT); 745 mp->mnt_data = NULL; 746 MNT_ILOCK(mp); 747 mp->mnt_flag &= ~MNT_LOCAL; 748 MNT_IUNLOCK(mp); 749 return (error); 750} 751 752/* 753 * Flush out all the files in a filesystem. 754 */ 755static int 756ext2_flushfiles(struct mount *mp, int flags, struct thread *td) 757{ 758 int error; 759 760 error = vflush(mp, 0, flags, td); 761 return (error); 762} 763/* 764 * Get filesystem statistics. 765 */ 766int 767ext2_statfs(struct mount *mp, struct statfs *sbp) 768{ 769 struct ext2mount *ump; 770 struct m_ext2fs *fs; 771 uint32_t overhead, overhead_per_group, ngdb; 772 int i, ngroups; 773 774 ump = VFSTOEXT2(mp); 775 fs = ump->um_e2fs; 776 if (fs->e2fs->e2fs_magic != E2FS_MAGIC) 777 panic("ext2_statfs"); 778 779 /* 780 * Compute the overhead (FS structures) 781 */ 782 overhead_per_group = 783 1 /* block bitmap */ + 784 1 /* inode bitmap */ + 785 fs->e2fs_itpg; 786 overhead = fs->e2fs->e2fs_first_dblock + 787 fs->e2fs_gcount * overhead_per_group; 788 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 789 fs->e2fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) { 790 for (i = 0, ngroups = 0; i < fs->e2fs_gcount; i++) { 791 if (cg_has_sb(i)) 792 ngroups++; 793 } 794 } else { 795 ngroups = fs->e2fs_gcount; 796 } 797 ngdb = fs->e2fs_gdbcount; 798 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 799 fs->e2fs->e2fs_features_compat & EXT2F_COMPAT_RESIZE) 800 ngdb += fs->e2fs->e2fs_reserved_ngdb; 801 overhead += ngroups * (1 /* superblock */ + ngdb); 802 803 sbp->f_bsize = EXT2_FRAG_SIZE(fs); 804 sbp->f_iosize = EXT2_BLOCK_SIZE(fs); 805 sbp->f_blocks = fs->e2fs->e2fs_bcount - overhead; 806 sbp->f_bfree = fs->e2fs->e2fs_fbcount; 807 sbp->f_bavail = sbp->f_bfree - fs->e2fs->e2fs_rbcount; 808 sbp->f_files = fs->e2fs->e2fs_icount; 809 sbp->f_ffree = fs->e2fs->e2fs_ficount; 810 return (0); 811} 812 813/* 814 * Go through the disk queues to initiate sandbagged IO; 815 * go through the inodes to write those that have been modified; 816 * initiate the writing of the super block if it has been modified. 817 * 818 * Note: we are always called with the filesystem marked `MPBUSY'. 819 */ 820static int 821ext2_sync(struct mount *mp, int waitfor) 822{ 823 struct vnode *mvp, *vp; 824 struct thread *td; 825 struct inode *ip; 826 struct ext2mount *ump = VFSTOEXT2(mp); 827 struct m_ext2fs *fs; 828 int error, allerror = 0; 829 830 td = curthread; 831 fs = ump->um_e2fs; 832 if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) { /* XXX */ 833 printf("fs = %s\n", fs->e2fs_fsmnt); 834 panic("ext2_sync: rofs mod"); 835 } 836 837 /* 838 * Write back each (modified) inode. 839 */ 840loop: 841 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 842 if (vp->v_type == VNON) { 843 VI_UNLOCK(vp); 844 continue; 845 } 846 ip = VTOI(vp); 847 if ((ip->i_flag & 848 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 && 849 (vp->v_bufobj.bo_dirty.bv_cnt == 0 || 850 waitfor == MNT_LAZY)) { 851 VI_UNLOCK(vp); 852 continue; 853 } 854 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 855 if (error) { 856 if (error == ENOENT) { 857 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 858 goto loop; 859 } 860 continue; 861 } 862 if ((error = VOP_FSYNC(vp, waitfor, td)) != 0) 863 allerror = error; 864 VOP_UNLOCK(vp, 0); 865 vrele(vp); 866 } 867 868 /* 869 * Force stale filesystem control information to be flushed. 870 */ 871 if (waitfor != MNT_LAZY) { 872 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); 873 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0) 874 allerror = error; 875 VOP_UNLOCK(ump->um_devvp, 0); 876 } 877 878 /* 879 * Write back modified superblock. 880 */ 881 if (fs->e2fs_fmod != 0) { 882 fs->e2fs_fmod = 0; 883 fs->e2fs->e2fs_wtime = time_second; 884 if ((error = ext2_cgupdate(ump, waitfor)) != 0) 885 allerror = error; 886 } 887 return (allerror); 888} 889 890/* 891 * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it 892 * in from disk. If it is in core, wait for the lock bit to clear, then 893 * return the inode locked. Detection and handling of mount points must be 894 * done by the calling routine. 895 */ 896static int 897ext2_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp) 898{ 899 struct m_ext2fs *fs; 900 struct inode *ip; 901 struct ext2mount *ump; 902 struct buf *bp; 903 struct vnode *vp; 904 struct cdev *dev; 905 struct thread *td; 906 int i, error; 907 int used_blocks; 908 909 td = curthread; 910 error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL); 911 if (error || *vpp != NULL) 912 return (error); 913 914 ump = VFSTOEXT2(mp); 915 dev = ump->um_dev; 916 ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO); 917 918 /* Allocate a new vnode/inode. */ 919 if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) { 920 *vpp = NULL; 921 free(ip, M_EXT2NODE); 922 return (error); 923 } 924 vp->v_data = ip; 925 ip->i_vnode = vp; 926 ip->i_e2fs = fs = ump->um_e2fs; 927 ip->i_ump = ump; 928 ip->i_number = ino; 929 930 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL); 931 error = insmntque(vp, mp); 932 if (error != 0) { 933 free(ip, M_EXT2NODE); 934 *vpp = NULL; 935 return (error); 936 } 937 error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL); 938 if (error || *vpp != NULL) 939 return (error); 940 941 /* Read in the disk contents for the inode, copy into the inode. */ 942 if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)), 943 (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) { 944 /* 945 * The inode does not contain anything useful, so it would 946 * be misleading to leave it on its hash chain. With mode 947 * still zero, it will be unlinked and returned to the free 948 * list by vput(). 949 */ 950 brelse(bp); 951 vput(vp); 952 *vpp = NULL; 953 return (error); 954 } 955 /* convert ext2 inode to dinode */ 956 ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data + EXT2_INODE_SIZE(fs) * 957 ino_to_fsbo(fs, ino)), ip); 958 ip->i_block_group = ino_to_cg(fs, ino); 959 ip->i_next_alloc_block = 0; 960 ip->i_next_alloc_goal = 0; 961 962 /* 963 * Now we want to make sure that block pointers for unused 964 * blocks are zeroed out - ext2_balloc depends on this 965 * although for regular files and directories only 966 * 967 * If IN_E4EXTENTS is enabled, unused blocks are not zeroed 968 * out because we could corrupt the extent tree. 969 */ 970 if (!(ip->i_flag & IN_E4EXTENTS) && 971 (S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode))) { 972 used_blocks = (ip->i_size+fs->e2fs_bsize-1) / fs->e2fs_bsize; 973 for (i = used_blocks; i < EXT2_NDIR_BLOCKS; i++) 974 ip->i_db[i] = 0; 975 } 976/* 977 ext2_print_inode(ip); 978*/ 979 bqrelse(bp); 980 981 /* 982 * Initialize the vnode from the inode, check for aliases. 983 * Note that the underlying vnode may have changed. 984 */ 985 if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) { 986 vput(vp); 987 *vpp = NULL; 988 return (error); 989 } 990 991 /* 992 * Finish inode initialization. 993 */ 994 995 /* 996 * Set up a generation number for this inode if it does not 997 * already have one. This should only happen on old filesystems. 998 */ 999 if (ip->i_gen == 0) { 1000 ip->i_gen = random() + 1; 1001 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) 1002 ip->i_flag |= IN_MODIFIED; 1003 } 1004 *vpp = vp; 1005 return (0); 1006} 1007 1008/* 1009 * File handle to vnode 1010 * 1011 * Have to be really careful about stale file handles: 1012 * - check that the inode number is valid 1013 * - call ext2_vget() to get the locked inode 1014 * - check for an unallocated inode (i_mode == 0) 1015 * - check that the given client host has export rights and return 1016 * those rights via. exflagsp and credanonp 1017 */ 1018static int 1019ext2_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp) 1020{ 1021 struct inode *ip; 1022 struct ufid *ufhp; 1023 struct vnode *nvp; 1024 struct m_ext2fs *fs; 1025 int error; 1026 1027 ufhp = (struct ufid *)fhp; 1028 fs = VFSTOEXT2(mp)->um_e2fs; 1029 if (ufhp->ufid_ino < EXT2_ROOTINO || 1030 ufhp->ufid_ino > fs->e2fs_gcount * fs->e2fs->e2fs_ipg) 1031 return (ESTALE); 1032 1033 error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp); 1034 if (error) { 1035 *vpp = NULLVP; 1036 return (error); 1037 } 1038 ip = VTOI(nvp); 1039 if (ip->i_mode == 0 || 1040 ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) { 1041 vput(nvp); 1042 *vpp = NULLVP; 1043 return (ESTALE); 1044 } 1045 *vpp = nvp; 1046 vnode_create_vobject(*vpp, 0, curthread); 1047 return (0); 1048} 1049 1050/* 1051 * Write a superblock and associated information back to disk. 1052 */ 1053static int 1054ext2_sbupdate(struct ext2mount *mp, int waitfor) 1055{ 1056 struct m_ext2fs *fs = mp->um_e2fs; 1057 struct ext2fs *es = fs->e2fs; 1058 struct buf *bp; 1059 int error = 0; 1060 1061 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0, 0); 1062 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2fs)); 1063 if (waitfor == MNT_WAIT) 1064 error = bwrite(bp); 1065 else 1066 bawrite(bp); 1067 1068 /* 1069 * The buffers for group descriptors, inode bitmaps and block bitmaps 1070 * are not busy at this point and are (hopefully) written by the 1071 * usual sync mechanism. No need to write them here. 1072 */ 1073 return (error); 1074} 1075int 1076ext2_cgupdate(struct ext2mount *mp, int waitfor) 1077{ 1078 struct m_ext2fs *fs = mp->um_e2fs; 1079 struct buf *bp; 1080 int i, error = 0, allerror = 0; 1081 1082 allerror = ext2_sbupdate(mp, waitfor); 1083 for (i = 0; i < fs->e2fs_gdbcount; i++) { 1084 bp = getblk(mp->um_devvp, fsbtodb(fs, 1085 fs->e2fs->e2fs_first_dblock + 1086 1 /* superblock */ + i), fs->e2fs_bsize, 0, 0, 0); 1087 e2fs_cgsave(&fs->e2fs_gd[ 1088 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 1089 (struct ext2_gd *)bp->b_data, fs->e2fs_bsize); 1090 if (waitfor == MNT_WAIT) 1091 error = bwrite(bp); 1092 else 1093 bawrite(bp); 1094 } 1095 1096 if (!allerror && error) 1097 allerror = error; 1098 return (allerror); 1099} 1100/* 1101 * Return the root of a filesystem. 1102 */ 1103static int 1104ext2_root(struct mount *mp, int flags, struct vnode **vpp) 1105{ 1106 struct vnode *nvp; 1107 int error; 1108 1109 error = VFS_VGET(mp, EXT2_ROOTINO, LK_EXCLUSIVE, &nvp); 1110 if (error) 1111 return (error); 1112 *vpp = nvp; 1113 return (0); 1114} 1115