ext2_vfsops.c revision 243311
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: head/sys/fs/ext2fs/ext2_vfsops.c 243311 2012-11-19 22:43:45Z attilio $ 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 - 1) 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; 321 322 fs->e2fs_bsize = EXT2_MIN_BLOCK_SIZE << es->e2fs_log_bsize; 323 fs->e2fs_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->e2fs_log_bsize; 324 fs->e2fs_fsbtodb = es->e2fs_log_bsize + 1; 325 fs->e2fs_qbmask = fs->e2fs_bsize - 1; 326 fs->e2fs_blocksize_bits = es->e2fs_log_bsize + 10; 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_first_inode = EXT2_FIRSTINO; 335 fs->e2fs_isize = E2FS_REV0_INODE_SIZE ; 336 } else { 337 fs->e2fs_first_inode = es->e2fs_first_ino; 338 fs->e2fs_isize = es->e2fs_inode_size; 339 340 /* 341 * Simple sanity check for superblock inode size value. 342 */ 343 if (EXT2_INODE_SIZE(fs) < E2FS_REV0_INODE_SIZE || 344 EXT2_INODE_SIZE(fs) > fs->e2fs_bsize || 345 (fs->e2fs_isize & (fs->e2fs_isize - 1)) != 0) { 346 printf("ext2fs: invalid inode size %d\n", 347 fs->e2fs_isize); 348 return (EIO); 349 } 350 } 351 /* Check for extra isize in big inodes. */ 352 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT4F_ROCOMPAT_EXTRA_ISIZE) && 353 EXT2_INODE_SIZE(fs) < sizeof(struct ext2fs_dinode)) { 354 printf("ext2fs: no space for extra inode timestamps\n"); 355 return (EINVAL); 356 } 357 358 fs->e2fs_ipb = fs->e2fs_bsize / EXT2_INODE_SIZE(fs); 359 fs->e2fs_itpg = fs->e2fs_ipg /fs->e2fs_ipb; 360 fs->e2fs_descpb = fs->e2fs_bsize / sizeof(struct ext2_gd); 361 /* s_resuid / s_resgid ? */ 362 fs->e2fs_gcount = (es->e2fs_bcount - es->e2fs_first_dblock + 363 EXT2_BLOCKS_PER_GROUP(fs) - 1) / EXT2_BLOCKS_PER_GROUP(fs); 364 db_count = (fs->e2fs_gcount + EXT2_DESC_PER_BLOCK(fs) - 1) / 365 EXT2_DESC_PER_BLOCK(fs); 366 fs->e2fs_gdbcount = db_count; 367 fs->e2fs_gd = malloc(db_count * fs->e2fs_bsize, 368 M_EXT2MNT, M_WAITOK); 369 fs->e2fs_contigdirs = malloc(fs->e2fs_gcount * 370 sizeof(*fs->e2fs_contigdirs), M_EXT2MNT, M_WAITOK); 371 372 /* 373 * Adjust logic_sb_block. 374 * Godmar thinks: if the blocksize is greater than 1024, then 375 * the superblock is logically part of block zero. 376 */ 377 if(fs->e2fs_bsize > SBSIZE) 378 logic_sb_block = 0; 379 for (i = 0; i < db_count; i++) { 380 error = bread(devvp , 381 fsbtodb(fs, logic_sb_block + i + 1 ), 382 fs->e2fs_bsize, NOCRED, &bp); 383 if (error) { 384 free(fs->e2fs_gd, M_EXT2MNT); 385 brelse(bp); 386 return (error); 387 } 388 e2fs_cgload((struct ext2_gd *)bp->b_data, 389 &fs->e2fs_gd[ 390 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 391 fs->e2fs_bsize); 392 brelse(bp); 393 bp = NULL; 394 } 395 fs->e2fs_total_dir = 0; 396 for (i=0; i < fs->e2fs_gcount; i++){ 397 fs->e2fs_total_dir += fs->e2fs_gd[i].ext2bgd_ndirs; 398 fs->e2fs_contigdirs[i] = 0; 399 } 400 if (es->e2fs_rev == E2FS_REV0 || 401 !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_LARGEFILE)) 402 fs->e2fs_maxfilesize = 0x7fffffff; 403 else 404 fs->e2fs_maxfilesize = 0x7fffffffffffffff; 405 return (0); 406} 407 408/* 409 * Reload all incore data for a filesystem (used after running fsck on 410 * the root filesystem and finding things to fix). The filesystem must 411 * be mounted read-only. 412 * 413 * Things to do to update the mount: 414 * 1) invalidate all cached meta-data. 415 * 2) re-read superblock from disk. 416 * 3) invalidate all cluster summary information. 417 * 4) invalidate all inactive vnodes. 418 * 5) invalidate all cached file data. 419 * 6) re-read inode data for all active vnodes. 420 * XXX we are missing some steps, in particular # 3, this has to be reviewed. 421 */ 422static int 423ext2_reload(struct mount *mp, struct thread *td) 424{ 425 struct vnode *vp, *mvp, *devvp; 426 struct inode *ip; 427 struct buf *bp; 428 struct ext2fs *es; 429 struct m_ext2fs *fs; 430 struct csum *sump; 431 int error, i; 432 int32_t *lp; 433 434 if ((mp->mnt_flag & MNT_RDONLY) == 0) 435 return (EINVAL); 436 /* 437 * Step 1: invalidate all cached meta-data. 438 */ 439 devvp = VFSTOEXT2(mp)->um_devvp; 440 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 441 if (vinvalbuf(devvp, 0, 0, 0) != 0) 442 panic("ext2_reload: dirty1"); 443 VOP_UNLOCK(devvp, 0); 444 445 /* 446 * Step 2: re-read superblock from disk. 447 * constants have been adjusted for ext2 448 */ 449 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 450 return (error); 451 es = (struct ext2fs *)bp->b_data; 452 if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) { 453 brelse(bp); 454 return (EIO); /* XXX needs translation */ 455 } 456 fs = VFSTOEXT2(mp)->um_e2fs; 457 bcopy(bp->b_data, fs->e2fs, sizeof(struct ext2fs)); 458 459 if((error = compute_sb_data(devvp, es, fs)) != 0) { 460 brelse(bp); 461 return (error); 462 } 463#ifdef UNKLAR 464 if (fs->fs_sbsize < SBSIZE) 465 bp->b_flags |= B_INVAL; 466#endif 467 brelse(bp); 468 469 /* 470 * Step 3: invalidate all cluster summary information. 471 */ 472 if (fs->e2fs_contigsumsize > 0) { 473 lp = fs->e2fs_maxcluster; 474 sump = fs->e2fs_clustersum; 475 for (i = 0; i < fs->e2fs_gcount; i++, sump++) { 476 *lp++ = fs->e2fs_contigsumsize; 477 sump->cs_init = 0; 478 bzero(sump->cs_sum, fs->e2fs_contigsumsize + 1); 479 } 480 } 481 482loop: 483 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 484 /* 485 * Step 4: invalidate all cached file data. 486 */ 487 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) { 488 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 489 goto loop; 490 } 491 if (vinvalbuf(vp, 0, 0, 0)) 492 panic("ext2_reload: dirty2"); 493 494 /* 495 * Step 5: re-read inode data for all active vnodes. 496 */ 497 ip = VTOI(vp); 498 error = bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), 499 (int)fs->e2fs_bsize, NOCRED, &bp); 500 if (error) { 501 VOP_UNLOCK(vp, 0); 502 vrele(vp); 503 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 504 return (error); 505 } 506 ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data + 507 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)), ip); 508 brelse(bp); 509 VOP_UNLOCK(vp, 0); 510 vrele(vp); 511 } 512 return (0); 513} 514 515/* 516 * Common code for mount and mountroot. 517 */ 518static int 519ext2_mountfs(struct vnode *devvp, struct mount *mp) 520{ 521 struct ext2mount *ump; 522 struct buf *bp; 523 struct m_ext2fs *fs; 524 struct ext2fs *es; 525 struct cdev *dev = devvp->v_rdev; 526 struct g_consumer *cp; 527 struct bufobj *bo; 528 struct csum *sump; 529 int error; 530 int ronly; 531 int i, size; 532 int32_t *lp; 533 534 ronly = vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0); 535 /* XXX: use VOP_ACESS to check FS perms */ 536 DROP_GIANT(); 537 g_topology_lock(); 538 error = g_vfs_open(devvp, &cp, "ext2fs", ronly ? 0 : 1); 539 g_topology_unlock(); 540 PICKUP_GIANT(); 541 VOP_UNLOCK(devvp, 0); 542 if (error) 543 return (error); 544 545 /* XXX: should we check for some sectorsize or 512 instead? */ 546 if (((SBSIZE % cp->provider->sectorsize) != 0) || 547 (SBSIZE < cp->provider->sectorsize)) { 548 DROP_GIANT(); 549 g_topology_lock(); 550 g_vfs_close(cp); 551 g_topology_unlock(); 552 PICKUP_GIANT(); 553 return (EINVAL); 554 } 555 556 bo = &devvp->v_bufobj; 557 bo->bo_private = cp; 558 bo->bo_ops = g_vfs_bufops; 559 if (devvp->v_rdev->si_iosize_max != 0) 560 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max; 561 if (mp->mnt_iosize_max > MAXPHYS) 562 mp->mnt_iosize_max = MAXPHYS; 563 564 bp = NULL; 565 ump = NULL; 566 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 567 goto out; 568 es = (struct ext2fs *)bp->b_data; 569 if (ext2_check_sb_compat(es, dev, ronly) != 0) { 570 error = EINVAL; /* XXX needs translation */ 571 goto out; 572 } 573 if ((es->e2fs_state & E2FS_ISCLEAN) == 0 || 574 (es->e2fs_state & E2FS_ERRORS)) { 575 if (ronly || (mp->mnt_flag & MNT_FORCE)) { 576 printf( 577"WARNING: Filesystem was not properly dismounted\n"); 578 } else { 579 printf( 580"WARNING: R/W mount denied. Filesystem is not clean - run fsck\n"); 581 error = EPERM; 582 goto out; 583 } 584 } 585 ump = malloc(sizeof(*ump), M_EXT2MNT, M_WAITOK | M_ZERO); 586 587 /* 588 * I don't know whether this is the right strategy. Note that 589 * we dynamically allocate both an ext2_sb_info and an ext2_super_block 590 * while Linux keeps the super block in a locked buffer. 591 */ 592 ump->um_e2fs = malloc(sizeof(struct m_ext2fs), 593 M_EXT2MNT, M_WAITOK); 594 ump->um_e2fs->e2fs = malloc(sizeof(struct ext2fs), 595 M_EXT2MNT, M_WAITOK); 596 mtx_init(EXT2_MTX(ump), "EXT2FS", "EXT2FS Lock", MTX_DEF); 597 bcopy(es, ump->um_e2fs->e2fs, (u_int)sizeof(struct ext2fs)); 598 if ((error = compute_sb_data(devvp, ump->um_e2fs->e2fs, ump->um_e2fs))) 599 goto out; 600 601 /* 602 * Calculate the maximum contiguous blocks and size of cluster summary 603 * array. In FFS this is done by newfs; however, the superblock 604 * in ext2fs doesn't have these variables, so we can calculate 605 * them here. 606 */ 607 ump->um_e2fs->e2fs_maxcontig = MAX(1, MAXPHYS / ump->um_e2fs->e2fs_bsize); 608 if (ump->um_e2fs->e2fs_maxcontig > 0) 609 ump->um_e2fs->e2fs_contigsumsize = 610 MIN(ump->um_e2fs->e2fs_maxcontig, EXT2_MAXCONTIG); 611 else 612 ump->um_e2fs->e2fs_contigsumsize = 0; 613 if (ump->um_e2fs->e2fs_contigsumsize > 0) { 614 size = ump->um_e2fs->e2fs_gcount * sizeof(int32_t); 615 ump->um_e2fs->e2fs_maxcluster = malloc(size, M_EXT2MNT, M_WAITOK); 616 size = ump->um_e2fs->e2fs_gcount * sizeof(struct csum); 617 ump->um_e2fs->e2fs_clustersum = malloc(size, M_EXT2MNT, M_WAITOK); 618 lp = ump->um_e2fs->e2fs_maxcluster; 619 sump = ump->um_e2fs->e2fs_clustersum; 620 for (i = 0; i < ump->um_e2fs->e2fs_gcount; i++, sump++) { 621 *lp++ = ump->um_e2fs->e2fs_contigsumsize; 622 sump->cs_init = 0; 623 sump->cs_sum = malloc((ump->um_e2fs->e2fs_contigsumsize + 1) * 624 sizeof(int32_t), M_EXT2MNT, M_WAITOK | M_ZERO); 625 } 626 } 627 628 brelse(bp); 629 bp = NULL; 630 fs = ump->um_e2fs; 631 fs->e2fs_ronly = ronly; /* ronly is set according to mnt_flags */ 632 633 /* 634 * If the fs is not mounted read-only, make sure the super block is 635 * always written back on a sync(). 636 */ 637 fs->e2fs_wasvalid = fs->e2fs->e2fs_state & E2FS_ISCLEAN ? 1 : 0; 638 if (ronly == 0) { 639 fs->e2fs_fmod = 1; /* mark it modified */ 640 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN; /* set fs invalid */ 641 } 642 mp->mnt_data = ump; 643 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 644 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 645 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN; 646 MNT_ILOCK(mp); 647 mp->mnt_flag |= MNT_LOCAL; 648 MNT_IUNLOCK(mp); 649 ump->um_mountp = mp; 650 ump->um_dev = dev; 651 ump->um_devvp = devvp; 652 ump->um_bo = &devvp->v_bufobj; 653 ump->um_cp = cp; 654 655 /* 656 * Setting those two parameters allowed us to use 657 * ufs_bmap w/o changse! 658 */ 659 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs); 660 ump->um_bptrtodb = fs->e2fs->e2fs_log_bsize + 1; 661 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs); 662 if (ronly == 0) 663 ext2_sbupdate(ump, MNT_WAIT); 664 /* 665 * Initialize filesystem stat information in mount struct. 666 */ 667 MNT_ILOCK(mp); 668 mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED; 669 MNT_IUNLOCK(mp); 670 return (0); 671out: 672 if (bp) 673 brelse(bp); 674 if (cp != NULL) { 675 DROP_GIANT(); 676 g_topology_lock(); 677 g_vfs_close(cp); 678 g_topology_unlock(); 679 PICKUP_GIANT(); 680 } 681 if (ump) { 682 mtx_destroy(EXT2_MTX(ump)); 683 free(ump->um_e2fs->e2fs_gd, M_EXT2MNT); 684 free(ump->um_e2fs->e2fs_contigdirs, M_EXT2MNT); 685 free(ump->um_e2fs->e2fs, M_EXT2MNT); 686 free(ump->um_e2fs, M_EXT2MNT); 687 free(ump, M_EXT2MNT); 688 mp->mnt_data = NULL; 689 } 690 return (error); 691} 692 693/* 694 * Unmount system call. 695 */ 696static int 697ext2_unmount(struct mount *mp, int mntflags) 698{ 699 struct ext2mount *ump; 700 struct m_ext2fs *fs; 701 struct csum *sump; 702 int error, flags, i, ronly; 703 704 flags = 0; 705 if (mntflags & MNT_FORCE) { 706 if (mp->mnt_flag & MNT_ROOTFS) 707 return (EINVAL); 708 flags |= FORCECLOSE; 709 } 710 if ((error = ext2_flushfiles(mp, flags, curthread)) != 0) 711 return (error); 712 ump = VFSTOEXT2(mp); 713 fs = ump->um_e2fs; 714 ronly = fs->e2fs_ronly; 715 if (ronly == 0 && ext2_cgupdate(ump, MNT_WAIT) == 0) { 716 if (fs->e2fs_wasvalid) 717 fs->e2fs->e2fs_state |= E2FS_ISCLEAN; 718 ext2_sbupdate(ump, MNT_WAIT); 719 } 720 721 DROP_GIANT(); 722 g_topology_lock(); 723 g_vfs_close(ump->um_cp); 724 g_topology_unlock(); 725 PICKUP_GIANT(); 726 vrele(ump->um_devvp); 727 sump = fs->e2fs_clustersum; 728 for (i = 0; i < fs->e2fs_gcount; i++, sump++) 729 free(sump->cs_sum, M_EXT2MNT); 730 free(fs->e2fs_clustersum, M_EXT2MNT); 731 free(fs->e2fs_maxcluster, M_EXT2MNT); 732 free(fs->e2fs_gd, M_EXT2MNT); 733 free(fs->e2fs_contigdirs, M_EXT2MNT); 734 free(fs->e2fs, M_EXT2MNT); 735 free(fs, M_EXT2MNT); 736 free(ump, M_EXT2MNT); 737 mp->mnt_data = NULL; 738 MNT_ILOCK(mp); 739 mp->mnt_flag &= ~MNT_LOCAL; 740 MNT_IUNLOCK(mp); 741 return (error); 742} 743 744/* 745 * Flush out all the files in a filesystem. 746 */ 747static int 748ext2_flushfiles(struct mount *mp, int flags, struct thread *td) 749{ 750 int error; 751 752 error = vflush(mp, 0, flags, td); 753 return (error); 754} 755/* 756 * Get file system statistics. 757 */ 758int 759ext2_statfs(struct mount *mp, struct statfs *sbp) 760{ 761 struct ext2mount *ump; 762 struct m_ext2fs *fs; 763 uint32_t overhead, overhead_per_group, ngdb; 764 int i, ngroups; 765 766 ump = VFSTOEXT2(mp); 767 fs = ump->um_e2fs; 768 if (fs->e2fs->e2fs_magic != E2FS_MAGIC) 769 panic("ext2fs_statfs"); 770 771 /* 772 * Compute the overhead (FS structures) 773 */ 774 overhead_per_group = 775 1 /* block bitmap */ + 776 1 /* inode bitmap */ + 777 fs->e2fs_itpg; 778 overhead = fs->e2fs->e2fs_first_dblock + 779 fs->e2fs_gcount * overhead_per_group; 780 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 781 fs->e2fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) { 782 for (i = 0, ngroups = 0; i < fs->e2fs_gcount; i++) { 783 if (cg_has_sb(i)) 784 ngroups++; 785 } 786 } else { 787 ngroups = fs->e2fs_gcount; 788 } 789 ngdb = fs->e2fs_gdbcount; 790 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 791 fs->e2fs->e2fs_features_compat & EXT2F_COMPAT_RESIZE) 792 ngdb += fs->e2fs->e2fs_reserved_ngdb; 793 overhead += ngroups * (1 /* superblock */ + ngdb); 794 795 sbp->f_bsize = EXT2_FRAG_SIZE(fs); 796 sbp->f_iosize = EXT2_BLOCK_SIZE(fs); 797 sbp->f_blocks = fs->e2fs->e2fs_bcount - overhead; 798 sbp->f_bfree = fs->e2fs->e2fs_fbcount; 799 sbp->f_bavail = sbp->f_bfree - fs->e2fs->e2fs_rbcount; 800 sbp->f_files = fs->e2fs->e2fs_icount; 801 sbp->f_ffree = fs->e2fs->e2fs_ficount; 802 return (0); 803} 804 805/* 806 * Go through the disk queues to initiate sandbagged IO; 807 * go through the inodes to write those that have been modified; 808 * initiate the writing of the super block if it has been modified. 809 * 810 * Note: we are always called with the filesystem marked `MPBUSY'. 811 */ 812static int 813ext2_sync(struct mount *mp, int waitfor) 814{ 815 struct vnode *mvp, *vp; 816 struct thread *td; 817 struct inode *ip; 818 struct ext2mount *ump = VFSTOEXT2(mp); 819 struct m_ext2fs *fs; 820 int error, allerror = 0; 821 822 td = curthread; 823 fs = ump->um_e2fs; 824 if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) { /* XXX */ 825 printf("fs = %s\n", fs->e2fs_fsmnt); 826 panic("ext2_sync: rofs mod"); 827 } 828 829 /* 830 * Write back each (modified) inode. 831 */ 832loop: 833 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 834 if (vp->v_type == VNON) { 835 VI_UNLOCK(vp); 836 continue; 837 } 838 ip = VTOI(vp); 839 if ((ip->i_flag & 840 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 && 841 (vp->v_bufobj.bo_dirty.bv_cnt == 0 || 842 waitfor == MNT_LAZY)) { 843 VI_UNLOCK(vp); 844 continue; 845 } 846 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 847 if (error) { 848 if (error == ENOENT) { 849 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 850 goto loop; 851 } 852 continue; 853 } 854 if ((error = VOP_FSYNC(vp, waitfor, td)) != 0) 855 allerror = error; 856 VOP_UNLOCK(vp, 0); 857 vrele(vp); 858 } 859 860 /* 861 * Force stale file system control information to be flushed. 862 */ 863 if (waitfor != MNT_LAZY) { 864 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); 865 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0) 866 allerror = error; 867 VOP_UNLOCK(ump->um_devvp, 0); 868 } 869 870 /* 871 * Write back modified superblock. 872 */ 873 if (fs->e2fs_fmod != 0) { 874 fs->e2fs_fmod = 0; 875 fs->e2fs->e2fs_wtime = time_second; 876 if ((error = ext2_cgupdate(ump, waitfor)) != 0) 877 allerror = error; 878 } 879 return (allerror); 880} 881 882/* 883 * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it 884 * in from disk. If it is in core, wait for the lock bit to clear, then 885 * return the inode locked. Detection and handling of mount points must be 886 * done by the calling routine. 887 */ 888static int 889ext2_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp) 890{ 891 struct m_ext2fs *fs; 892 struct inode *ip; 893 struct ext2mount *ump; 894 struct buf *bp; 895 struct vnode *vp; 896 struct cdev *dev; 897 struct thread *td; 898 int i, error; 899 int used_blocks; 900 901 td = curthread; 902 error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL); 903 if (error || *vpp != NULL) 904 return (error); 905 906 ump = VFSTOEXT2(mp); 907 dev = ump->um_dev; 908 ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO); 909 910 /* Allocate a new vnode/inode. */ 911 if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) { 912 *vpp = NULL; 913 free(ip, M_EXT2NODE); 914 return (error); 915 } 916 vp->v_data = ip; 917 ip->i_vnode = vp; 918 ip->i_e2fs = fs = ump->um_e2fs; 919 ip->i_ump = ump; 920 ip->i_number = ino; 921 922 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL); 923 error = insmntque(vp, mp); 924 if (error != 0) { 925 free(ip, M_EXT2NODE); 926 *vpp = NULL; 927 return (error); 928 } 929 error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL); 930 if (error || *vpp != NULL) 931 return (error); 932 933 /* Read in the disk contents for the inode, copy into the inode. */ 934 if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)), 935 (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) { 936 /* 937 * The inode does not contain anything useful, so it would 938 * be misleading to leave it on its hash chain. With mode 939 * still zero, it will be unlinked and returned to the free 940 * list by vput(). 941 */ 942 brelse(bp); 943 vput(vp); 944 *vpp = NULL; 945 return (error); 946 } 947 /* convert ext2 inode to dinode */ 948 ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data + EXT2_INODE_SIZE(fs) * 949 ino_to_fsbo(fs, ino)), ip); 950 ip->i_block_group = ino_to_cg(fs, ino); 951 ip->i_next_alloc_block = 0; 952 ip->i_next_alloc_goal = 0; 953 954 /* 955 * Now we want to make sure that block pointers for unused 956 * blocks are zeroed out - ext2_balloc depends on this 957 * although for regular files and directories only 958 */ 959 if(S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode)) { 960 used_blocks = (ip->i_size+fs->e2fs_bsize-1) / fs->e2fs_bsize; 961 for (i = used_blocks; i < EXT2_NDIR_BLOCKS; i++) 962 ip->i_db[i] = 0; 963 } 964/* 965 ext2_print_inode(ip); 966*/ 967 bqrelse(bp); 968 969 /* 970 * Initialize the vnode from the inode, check for aliases. 971 * Note that the underlying vnode may have changed. 972 */ 973 if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) { 974 vput(vp); 975 *vpp = NULL; 976 return (error); 977 } 978 979 /* 980 * Finish inode initialization. 981 */ 982 983 /* 984 * Set up a generation number for this inode if it does not 985 * already have one. This should only happen on old filesystems. 986 */ 987 if (ip->i_gen == 0) { 988 ip->i_gen = random() / 2 + 1; 989 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) 990 ip->i_flag |= IN_MODIFIED; 991 } 992 *vpp = vp; 993 return (0); 994} 995 996/* 997 * File handle to vnode 998 * 999 * Have to be really careful about stale file handles: 1000 * - check that the inode number is valid 1001 * - call ext2_vget() to get the locked inode 1002 * - check for an unallocated inode (i_mode == 0) 1003 * - check that the given client host has export rights and return 1004 * those rights via. exflagsp and credanonp 1005 */ 1006static int 1007ext2_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp) 1008{ 1009 struct inode *ip; 1010 struct ufid *ufhp; 1011 struct vnode *nvp; 1012 struct m_ext2fs *fs; 1013 int error; 1014 1015 ufhp = (struct ufid *)fhp; 1016 fs = VFSTOEXT2(mp)->um_e2fs; 1017 if (ufhp->ufid_ino < EXT2_ROOTINO || 1018 ufhp->ufid_ino > fs->e2fs_gcount * fs->e2fs->e2fs_ipg) 1019 return (ESTALE); 1020 1021 error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp); 1022 if (error) { 1023 *vpp = NULLVP; 1024 return (error); 1025 } 1026 ip = VTOI(nvp); 1027 if (ip->i_mode == 0 || 1028 ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) { 1029 vput(nvp); 1030 *vpp = NULLVP; 1031 return (ESTALE); 1032 } 1033 *vpp = nvp; 1034 vnode_create_vobject(*vpp, 0, curthread); 1035 return (0); 1036} 1037 1038/* 1039 * Write a superblock and associated information back to disk. 1040 */ 1041static int 1042ext2_sbupdate(struct ext2mount *mp, int waitfor) 1043{ 1044 struct m_ext2fs *fs = mp->um_e2fs; 1045 struct ext2fs *es = fs->e2fs; 1046 struct buf *bp; 1047 int error = 0; 1048 1049 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0, 0); 1050 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2fs)); 1051 if (waitfor == MNT_WAIT) 1052 error = bwrite(bp); 1053 else 1054 bawrite(bp); 1055 1056 /* 1057 * The buffers for group descriptors, inode bitmaps and block bitmaps 1058 * are not busy at this point and are (hopefully) written by the 1059 * usual sync mechanism. No need to write them here. 1060 */ 1061 return (error); 1062} 1063int 1064ext2_cgupdate(struct ext2mount *mp, int waitfor) 1065{ 1066 struct m_ext2fs *fs = mp->um_e2fs; 1067 struct buf *bp; 1068 int i, error = 0, allerror = 0; 1069 1070 allerror = ext2_sbupdate(mp, waitfor); 1071 for (i = 0; i < fs->e2fs_gdbcount; i++) { 1072 bp = getblk(mp->um_devvp, fsbtodb(fs, 1073 fs->e2fs->e2fs_first_dblock + 1074 1 /* superblock */ + i), fs->e2fs_bsize, 0, 0, 0); 1075 e2fs_cgsave(&fs->e2fs_gd[ 1076 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 1077 (struct ext2_gd *)bp->b_data, fs->e2fs_bsize); 1078 if (waitfor == MNT_WAIT) 1079 error = bwrite(bp); 1080 else 1081 bawrite(bp); 1082 } 1083 1084 if (!allerror && error) 1085 allerror = error; 1086 return (allerror); 1087} 1088/* 1089 * Return the root of a filesystem. 1090 */ 1091static int 1092ext2_root(struct mount *mp, int flags, struct vnode **vpp) 1093{ 1094 struct vnode *nvp; 1095 int error; 1096 1097 error = VFS_VGET(mp, EXT2_ROOTINO, LK_EXCLUSIVE, &nvp); 1098 if (error) 1099 return (error); 1100 *vpp = nvp; 1101 return (0); 1102} 1103