ext2_vfsops.c revision 228539
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 228539 2011-12-15 20:31:18Z 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/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 66static int ext2_flushfiles(struct mount *mp, int flags, struct thread *td); 67static int ext2_mountfs(struct vnode *, struct mount *); 68static int ext2_reload(struct mount *mp, struct thread *td); 69static int ext2_sbupdate(struct ext2mount *, int); 70static int ext2_cgupdate(struct ext2mount *, int); 71static vfs_unmount_t ext2_unmount; 72static vfs_root_t ext2_root; 73static vfs_statfs_t ext2_statfs; 74static vfs_sync_t ext2_sync; 75static vfs_vget_t ext2_vget; 76static vfs_fhtovp_t ext2_fhtovp; 77static vfs_mount_t ext2_mount; 78 79MALLOC_DEFINE(M_EXT2NODE, "ext2_node", "EXT2 vnode private part"); 80static MALLOC_DEFINE(M_EXT2MNT, "ext2_mount", "EXT2 mount structure"); 81 82static 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 92VFS_SET(ext2fs_vfsops, ext2fs, 0); 93 94static int ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev, 95 int ronly); 96static int compute_sb_data(struct vnode * devvp, 97 struct ext2fs * es, struct m_ext2fs * fs); 98 99static 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 */ 108static int 109ext2_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 282static int 283ext2_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 */ 312static int 313compute_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) invalidate all cluster summary information. 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 */ 414static int 415ext2_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 struct csum *sump; 423 int error, i; 424 int32_t *lp; 425 426 if ((mp->mnt_flag & MNT_RDONLY) == 0) 427 return (EINVAL); 428 /* 429 * Step 1: invalidate all cached meta-data. 430 */ 431 devvp = VFSTOEXT2(mp)->um_devvp; 432 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 433 if (vinvalbuf(devvp, 0, 0, 0) != 0) 434 panic("ext2_reload: dirty1"); 435 VOP_UNLOCK(devvp, 0); 436 437 /* 438 * Step 2: re-read superblock from disk. 439 * constants have been adjusted for ext2 440 */ 441 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 442 return (error); 443 es = (struct ext2fs *)bp->b_data; 444 if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) { 445 brelse(bp); 446 return (EIO); /* XXX needs translation */ 447 } 448 fs = VFSTOEXT2(mp)->um_e2fs; 449 bcopy(bp->b_data, fs->e2fs, sizeof(struct ext2fs)); 450 451 if((error = compute_sb_data(devvp, es, fs)) != 0) { 452 brelse(bp); 453 return (error); 454 } 455#ifdef UNKLAR 456 if (fs->fs_sbsize < SBSIZE) 457 bp->b_flags |= B_INVAL; 458#endif 459 brelse(bp); 460 461 /* 462 * Step 3: invalidate all cluster summary information. 463 */ 464 if (fs->e2fs_contigsumsize > 0) { 465 lp = fs->e2fs_maxcluster; 466 sump = fs->e2fs_clustersum; 467 for (i = 0; i < fs->e2fs_gcount; i++, sump++) { 468 *lp++ = fs->e2fs_contigsumsize; 469 sump->cs_init = 0; 470 bzero(sump->cs_sum, fs->e2fs_contigsumsize + 1); 471 } 472 } 473 474loop: 475 MNT_ILOCK(mp); 476 MNT_VNODE_FOREACH(vp, mp, mvp) { 477 VI_LOCK(vp); 478 if (vp->v_iflag & VI_DOOMED) { 479 VI_UNLOCK(vp); 480 continue; 481 } 482 MNT_IUNLOCK(mp); 483 /* 484 * Step 4: invalidate all cached file data. 485 */ 486 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) { 487 MNT_VNODE_FOREACH_ABORT(mp, mvp); 488 goto loop; 489 } 490 if (vinvalbuf(vp, 0, 0, 0)) 491 panic("ext2_reload: dirty2"); 492 493 /* 494 * Step 5: re-read inode data for all active vnodes. 495 */ 496 ip = VTOI(vp); 497 error = bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), 498 (int)fs->e2fs_bsize, NOCRED, &bp); 499 if (error) { 500 VOP_UNLOCK(vp, 0); 501 vrele(vp); 502 MNT_VNODE_FOREACH_ABORT(mp, mvp); 503 return (error); 504 } 505 ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data + 506 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)), ip); 507 brelse(bp); 508 VOP_UNLOCK(vp, 0); 509 vrele(vp); 510 MNT_ILOCK(mp); 511 } 512 MNT_IUNLOCK(mp); 513 return (0); 514} 515 516/* 517 * Common code for mount and mountroot. 518 */ 519static int 520ext2_mountfs(struct vnode *devvp, struct mount *mp) 521{ 522 struct ext2mount *ump; 523 struct buf *bp; 524 struct m_ext2fs *fs; 525 struct ext2fs *es; 526 struct cdev *dev = devvp->v_rdev; 527 struct g_consumer *cp; 528 struct bufobj *bo; 529 struct csum *sump; 530 int error; 531 int ronly; 532 int i, size; 533 int32_t *lp; 534 535 ronly = vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0); 536 /* XXX: use VOP_ACESS to check FS perms */ 537 DROP_GIANT(); 538 g_topology_lock(); 539 error = g_vfs_open(devvp, &cp, "ext2fs", ronly ? 0 : 1); 540 g_topology_unlock(); 541 PICKUP_GIANT(); 542 VOP_UNLOCK(devvp, 0); 543 if (error) 544 return (error); 545 546 /* XXX: should we check for some sectorsize or 512 instead? */ 547 if (((SBSIZE % cp->provider->sectorsize) != 0) || 548 (SBSIZE < cp->provider->sectorsize)) { 549 DROP_GIANT(); 550 g_topology_lock(); 551 g_vfs_close(cp); 552 g_topology_unlock(); 553 PICKUP_GIANT(); 554 return (EINVAL); 555 } 556 557 bo = &devvp->v_bufobj; 558 bo->bo_private = cp; 559 bo->bo_ops = g_vfs_bufops; 560 if (devvp->v_rdev->si_iosize_max != 0) 561 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max; 562 if (mp->mnt_iosize_max > MAXPHYS) 563 mp->mnt_iosize_max = MAXPHYS; 564 565 bp = NULL; 566 ump = NULL; 567 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 568 goto out; 569 es = (struct ext2fs *)bp->b_data; 570 if (ext2_check_sb_compat(es, dev, ronly) != 0) { 571 error = EINVAL; /* XXX needs translation */ 572 goto out; 573 } 574 if ((es->e2fs_state & E2FS_ISCLEAN) == 0 || 575 (es->e2fs_state & E2FS_ERRORS)) { 576 if (ronly || (mp->mnt_flag & MNT_FORCE)) { 577 printf( 578"WARNING: Filesystem was not properly dismounted\n"); 579 } else { 580 printf( 581"WARNING: R/W mount denied. Filesystem is not clean - run fsck\n"); 582 error = EPERM; 583 goto out; 584 } 585 } 586 ump = malloc(sizeof *ump, M_EXT2MNT, M_WAITOK); 587 bzero((caddr_t)ump, sizeof *ump); 588 589 /* 590 * I don't know whether this is the right strategy. Note that 591 * we dynamically allocate both an ext2_sb_info and an ext2_super_block 592 * while Linux keeps the super block in a locked buffer. 593 */ 594 ump->um_e2fs = malloc(sizeof(struct m_ext2fs), 595 M_EXT2MNT, M_WAITOK); 596 ump->um_e2fs->e2fs = malloc(sizeof(struct ext2fs), 597 M_EXT2MNT, M_WAITOK); 598 mtx_init(EXT2_MTX(ump), "EXT2FS", "EXT2FS Lock", MTX_DEF); 599 bcopy(es, ump->um_e2fs->e2fs, (u_int)sizeof(struct ext2fs)); 600 if ((error = compute_sb_data(devvp, ump->um_e2fs->e2fs, ump->um_e2fs))) 601 goto out; 602 603 /* 604 * Calculate the maximum contiguous blocks and size of cluster summary 605 * array. In FFS this is done by newfs; however the superblock in 606 * ext2fs doesn't have these variables so we just can calculate 607 * them here. 608 */ 609 ump->um_e2fs->e2fs_maxcontig = MAX(1, MAXPHYS / ump->um_e2fs->e2fs_bsize); 610 if (ump->um_e2fs->e2fs_maxcontig > 0) 611 ump->um_e2fs->e2fs_contigsumsize = 612 MIN(ump->um_e2fs->e2fs_maxcontig, EXT2_MAXCONTIG); 613 else 614 ump->um_e2fs->e2fs_contigsumsize = 0; 615 if (ump->um_e2fs->e2fs_contigsumsize > 0) { 616 size = ump->um_e2fs->e2fs_gcount * sizeof(int32_t); 617 ump->um_e2fs->e2fs_maxcluster = malloc(size, M_EXT2MNT, M_WAITOK); 618 size = ump->um_e2fs->e2fs_gcount * sizeof(struct csum); 619 ump->um_e2fs->e2fs_clustersum = malloc(size, M_EXT2MNT, M_WAITOK); 620 lp = ump->um_e2fs->e2fs_maxcluster; 621 sump = ump->um_e2fs->e2fs_clustersum; 622 for (i = 0; i < ump->um_e2fs->e2fs_gcount; i++, sump++) { 623 *lp++ = ump->um_e2fs->e2fs_contigsumsize; 624 sump->cs_init = 0; 625 sump->cs_sum = malloc((ump->um_e2fs->e2fs_contigsumsize + 1) * 626 sizeof(int32_t), M_EXT2MNT, M_WAITOK | M_ZERO); 627 } 628 } 629 630 brelse(bp); 631 bp = NULL; 632 fs = ump->um_e2fs; 633 fs->e2fs_ronly = ronly; /* ronly is set according to mnt_flags */ 634 635 /* 636 * If the fs is not mounted read-only, make sure the super block is 637 * always written back on a sync(). 638 */ 639 fs->e2fs_wasvalid = fs->e2fs->e2fs_state & E2FS_ISCLEAN ? 1 : 0; 640 if (ronly == 0) { 641 fs->e2fs_fmod = 1; /* mark it modified */ 642 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN; /* set fs invalid */ 643 } 644 mp->mnt_data = ump; 645 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 646 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 647 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN; 648 MNT_ILOCK(mp); 649 mp->mnt_flag |= MNT_LOCAL; 650 MNT_IUNLOCK(mp); 651 ump->um_mountp = mp; 652 ump->um_dev = dev; 653 ump->um_devvp = devvp; 654 ump->um_bo = &devvp->v_bufobj; 655 ump->um_cp = cp; 656 657 /* 658 * Setting those two parameters allowed us to use 659 * ufs_bmap w/o changse! 660 */ 661 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs); 662 ump->um_bptrtodb = fs->e2fs->e2fs_log_bsize + 1; 663 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs); 664 if (ronly == 0) 665 ext2_sbupdate(ump, MNT_WAIT); 666 /* 667 * Initialize filesystem stat information in mount struct. 668 */ 669 MNT_ILOCK(mp); 670 mp->mnt_kern_flag |= MNTK_MPSAFE | MNTK_LOOKUP_SHARED | 671 MNTK_EXTENDED_SHARED; 672 MNT_IUNLOCK(mp); 673 return (0); 674out: 675 if (bp) 676 brelse(bp); 677 if (cp != NULL) { 678 DROP_GIANT(); 679 g_topology_lock(); 680 g_vfs_close(cp); 681 g_topology_unlock(); 682 PICKUP_GIANT(); 683 } 684 if (ump) { 685 mtx_destroy(EXT2_MTX(ump)); 686 free(ump->um_e2fs->e2fs_gd, M_EXT2MNT); 687 free(ump->um_e2fs->e2fs_contigdirs, M_EXT2MNT); 688 free(ump->um_e2fs->e2fs, M_EXT2MNT); 689 free(ump->um_e2fs, M_EXT2MNT); 690 free(ump, M_EXT2MNT); 691 mp->mnt_data = NULL; 692 } 693 return (error); 694} 695 696/* 697 * Unmount system call. 698 */ 699static int 700ext2_unmount(struct mount *mp, int mntflags) 701{ 702 struct ext2mount *ump; 703 struct m_ext2fs *fs; 704 struct csum *sump; 705 int error, flags, i, ronly; 706 707 flags = 0; 708 if (mntflags & MNT_FORCE) { 709 if (mp->mnt_flag & MNT_ROOTFS) 710 return (EINVAL); 711 flags |= FORCECLOSE; 712 } 713 if ((error = ext2_flushfiles(mp, flags, curthread)) != 0) 714 return (error); 715 ump = VFSTOEXT2(mp); 716 fs = ump->um_e2fs; 717 ronly = fs->e2fs_ronly; 718 if (ronly == 0 && ext2_cgupdate(ump, MNT_WAIT) == 0) { 719 if (fs->e2fs_wasvalid) 720 fs->e2fs->e2fs_state |= E2FS_ISCLEAN; 721 ext2_sbupdate(ump, MNT_WAIT); 722 } 723 724 DROP_GIANT(); 725 g_topology_lock(); 726 g_vfs_close(ump->um_cp); 727 g_topology_unlock(); 728 PICKUP_GIANT(); 729 vrele(ump->um_devvp); 730 sump = fs->e2fs_clustersum; 731 for (i = 0; i < fs->e2fs_gcount; i++, sump++) 732 free(sump->cs_sum, M_EXT2MNT); 733 free(fs->e2fs_clustersum, M_EXT2MNT); 734 free(fs->e2fs_maxcluster, M_EXT2MNT); 735 free(fs->e2fs_gd, M_EXT2MNT); 736 free(fs->e2fs_contigdirs, M_EXT2MNT); 737 free(fs->e2fs, M_EXT2MNT); 738 free(fs, M_EXT2MNT); 739 free(ump, M_EXT2MNT); 740 mp->mnt_data = NULL; 741 MNT_ILOCK(mp); 742 mp->mnt_flag &= ~MNT_LOCAL; 743 MNT_IUNLOCK(mp); 744 return (error); 745} 746 747/* 748 * Flush out all the files in a filesystem. 749 */ 750static int 751ext2_flushfiles(struct mount *mp, int flags, struct thread *td) 752{ 753 int error; 754 755 error = vflush(mp, 0, flags, td); 756 return (error); 757} 758/* 759 * Get file system statistics. 760 */ 761int 762ext2_statfs(struct mount *mp, struct statfs *sbp) 763{ 764 struct ext2mount *ump; 765 struct m_ext2fs *fs; 766 uint32_t overhead, overhead_per_group, ngdb; 767 int i, ngroups; 768 769 ump = VFSTOEXT2(mp); 770 fs = ump->um_e2fs; 771 if (fs->e2fs->e2fs_magic != E2FS_MAGIC) 772 panic("ext2fs_statvfs"); 773 774 /* 775 * Compute the overhead (FS structures) 776 */ 777 overhead_per_group = 778 1 /* block bitmap */ + 779 1 /* inode bitmap */ + 780 fs->e2fs_itpg; 781 overhead = fs->e2fs->e2fs_first_dblock + 782 fs->e2fs_gcount * overhead_per_group; 783 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 784 fs->e2fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) { 785 for (i = 0, ngroups = 0; i < fs->e2fs_gcount; i++) { 786 if (cg_has_sb(i)) 787 ngroups++; 788 } 789 } else { 790 ngroups = fs->e2fs_gcount; 791 } 792 ngdb = fs->e2fs_gdbcount; 793 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 794 fs->e2fs->e2fs_features_compat & EXT2F_COMPAT_RESIZE) 795 ngdb += fs->e2fs->e2fs_reserved_ngdb; 796 overhead += ngroups * (1 /* superblock */ + ngdb); 797 798 sbp->f_bsize = EXT2_FRAG_SIZE(fs); 799 sbp->f_iosize = EXT2_BLOCK_SIZE(fs); 800 sbp->f_blocks = fs->e2fs->e2fs_bcount - overhead; 801 sbp->f_bfree = fs->e2fs->e2fs_fbcount; 802 sbp->f_bavail = sbp->f_bfree - fs->e2fs->e2fs_rbcount; 803 sbp->f_files = fs->e2fs->e2fs_icount; 804 sbp->f_ffree = fs->e2fs->e2fs_ficount; 805 return (0); 806} 807 808/* 809 * Go through the disk queues to initiate sandbagged IO; 810 * go through the inodes to write those that have been modified; 811 * initiate the writing of the super block if it has been modified. 812 * 813 * Note: we are always called with the filesystem marked `MPBUSY'. 814 */ 815static int 816ext2_sync(struct mount *mp, int waitfor) 817{ 818 struct vnode *mvp, *vp; 819 struct thread *td; 820 struct inode *ip; 821 struct ext2mount *ump = VFSTOEXT2(mp); 822 struct m_ext2fs *fs; 823 int error, allerror = 0; 824 825 td = curthread; 826 fs = ump->um_e2fs; 827 if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) { /* XXX */ 828 printf("fs = %s\n", fs->e2fs_fsmnt); 829 panic("ext2_sync: rofs mod"); 830 } 831 832 /* 833 * Write back each (modified) inode. 834 */ 835 MNT_ILOCK(mp); 836loop: 837 MNT_VNODE_FOREACH(vp, mp, mvp) { 838 VI_LOCK(vp); 839 if (vp->v_type == VNON || (vp->v_iflag & VI_DOOMED)) { 840 VI_UNLOCK(vp); 841 continue; 842 } 843 MNT_IUNLOCK(mp); 844 ip = VTOI(vp); 845 if ((ip->i_flag & 846 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 && 847 (vp->v_bufobj.bo_dirty.bv_cnt == 0 || 848 waitfor == MNT_LAZY)) { 849 VI_UNLOCK(vp); 850 MNT_ILOCK(mp); 851 continue; 852 } 853 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 854 if (error) { 855 MNT_ILOCK(mp); 856 if (error == ENOENT) { 857 MNT_VNODE_FOREACH_ABORT_ILOCKED(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 MNT_ILOCK(mp); 867 } 868 MNT_IUNLOCK(mp); 869 870 /* 871 * Force stale file system control information to be flushed. 872 */ 873 if (waitfor != MNT_LAZY) { 874 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); 875 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0) 876 allerror = error; 877 VOP_UNLOCK(ump->um_devvp, 0); 878 } 879 880 /* 881 * Write back modified superblock. 882 */ 883 if (fs->e2fs_fmod != 0) { 884 fs->e2fs_fmod = 0; 885 fs->e2fs->e2fs_wtime = time_second; 886 if ((error = ext2_cgupdate(ump, waitfor)) != 0) 887 allerror = error; 888 } 889 return (allerror); 890} 891 892/* 893 * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it 894 * in from disk. If it is in core, wait for the lock bit to clear, then 895 * return the inode locked. Detection and handling of mount points must be 896 * done by the calling routine. 897 */ 898static int 899ext2_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp) 900{ 901 struct m_ext2fs *fs; 902 struct inode *ip; 903 struct ext2mount *ump; 904 struct buf *bp; 905 struct vnode *vp; 906 struct cdev *dev; 907 struct thread *td; 908 int i, error; 909 int used_blocks; 910 911 td = curthread; 912 error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL); 913 if (error || *vpp != NULL) 914 return (error); 915 916 ump = VFSTOEXT2(mp); 917 dev = ump->um_dev; 918 919 /* 920 * If this malloc() is performed after the getnewvnode() 921 * it might block, leaving a vnode with a NULL v_data to be 922 * found by ext2_sync() if a sync happens to fire right then, 923 * which will cause a panic because ext2_sync() blindly 924 * dereferences vp->v_data (as well it should). 925 */ 926 ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO); 927 928 /* Allocate a new vnode/inode. */ 929 if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) { 930 *vpp = NULL; 931 free(ip, M_EXT2NODE); 932 return (error); 933 } 934 vp->v_data = ip; 935 ip->i_vnode = vp; 936 ip->i_e2fs = fs = ump->um_e2fs; 937 ip->i_ump = ump; 938 ip->i_number = ino; 939 940 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL); 941 error = insmntque(vp, mp); 942 if (error != 0) { 943 free(ip, M_EXT2NODE); 944 *vpp = NULL; 945 return (error); 946 } 947 error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL); 948 if (error || *vpp != NULL) 949 return (error); 950 951 /* Read in the disk contents for the inode, copy into the inode. */ 952 if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)), 953 (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) { 954 /* 955 * The inode does not contain anything useful, so it would 956 * be misleading to leave it on its hash chain. With mode 957 * still zero, it will be unlinked and returned to the free 958 * list by vput(). 959 */ 960 brelse(bp); 961 vput(vp); 962 *vpp = NULL; 963 return (error); 964 } 965 /* convert ext2 inode to dinode */ 966 ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data + EXT2_INODE_SIZE(fs) * 967 ino_to_fsbo(fs, ino)), ip); 968 ip->i_block_group = ino_to_cg(fs, ino); 969 ip->i_next_alloc_block = 0; 970 ip->i_next_alloc_goal = 0; 971 ip->i_prealloc_count = 0; 972 ip->i_prealloc_block = 0; 973 974 /* 975 * Now we want to make sure that block pointers for unused 976 * blocks are zeroed out - ext2_balloc depends on this 977 * although for regular files and directories only 978 */ 979 if(S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode)) { 980 used_blocks = (ip->i_size+fs->e2fs_bsize-1) / fs->e2fs_bsize; 981 for(i = used_blocks; i < EXT2_NDIR_BLOCKS; i++) 982 ip->i_db[i] = 0; 983 } 984/* 985 ext2_print_inode(ip); 986*/ 987 bqrelse(bp); 988 989 /* 990 * Initialize the vnode from the inode, check for aliases. 991 * Note that the underlying vnode may have changed. 992 */ 993 if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) { 994 vput(vp); 995 *vpp = NULL; 996 return (error); 997 } 998 999 /* 1000 * Finish inode initialization. 1001 */ 1002 1003 /* 1004 * Set up a generation number for this inode if it does not 1005 * already have one. This should only happen on old filesystems. 1006 */ 1007 if (ip->i_gen == 0) { 1008 ip->i_gen = random() / 2 + 1; 1009 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) 1010 ip->i_flag |= IN_MODIFIED; 1011 } 1012 *vpp = vp; 1013 return (0); 1014} 1015 1016/* 1017 * File handle to vnode 1018 * 1019 * Have to be really careful about stale file handles: 1020 * - check that the inode number is valid 1021 * - call ext2_vget() to get the locked inode 1022 * - check for an unallocated inode (i_mode == 0) 1023 * - check that the given client host has export rights and return 1024 * those rights via. exflagsp and credanonp 1025 */ 1026static int 1027ext2_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp) 1028{ 1029 struct inode *ip; 1030 struct ufid *ufhp; 1031 struct vnode *nvp; 1032 struct m_ext2fs *fs; 1033 int error; 1034 1035 ufhp = (struct ufid *)fhp; 1036 fs = VFSTOEXT2(mp)->um_e2fs; 1037 if (ufhp->ufid_ino < EXT2_ROOTINO || 1038 ufhp->ufid_ino > fs->e2fs_gcount * fs->e2fs->e2fs_ipg) 1039 return (ESTALE); 1040 1041 error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp); 1042 if (error) { 1043 *vpp = NULLVP; 1044 return (error); 1045 } 1046 ip = VTOI(nvp); 1047 if (ip->i_mode == 0 || 1048 ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) { 1049 vput(nvp); 1050 *vpp = NULLVP; 1051 return (ESTALE); 1052 } 1053 *vpp = nvp; 1054 vnode_create_vobject(*vpp, 0, curthread); 1055 return (0); 1056} 1057 1058/* 1059 * Write a superblock and associated information back to disk. 1060 */ 1061static int 1062ext2_sbupdate(struct ext2mount *mp, int waitfor) 1063{ 1064 struct m_ext2fs *fs = mp->um_e2fs; 1065 struct ext2fs *es = fs->e2fs; 1066 struct buf *bp; 1067 int error = 0; 1068 1069 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0, 0); 1070 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2fs)); 1071 if (waitfor == MNT_WAIT) 1072 error = bwrite(bp); 1073 else 1074 bawrite(bp); 1075 1076 /* 1077 * The buffers for group descriptors, inode bitmaps and block bitmaps 1078 * are not busy at this point and are (hopefully) written by the 1079 * usual sync mechanism. No need to write them here. 1080 */ 1081 return (error); 1082} 1083int 1084ext2_cgupdate(struct ext2mount *mp, int waitfor) 1085{ 1086 struct m_ext2fs *fs = mp->um_e2fs; 1087 struct buf *bp; 1088 int i, error = 0, allerror = 0; 1089 1090 allerror = ext2_sbupdate(mp, waitfor); 1091 for (i = 0; i < fs->e2fs_gdbcount; i++) { 1092 bp = getblk(mp->um_devvp, fsbtodb(fs, 1093 fs->e2fs->e2fs_first_dblock + 1094 1 /* superblock */ + i), fs->e2fs_bsize, 0, 0, 0); 1095 e2fs_cgsave(&fs->e2fs_gd[ 1096 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 1097 (struct ext2_gd *)bp->b_data, fs->e2fs_bsize); 1098 if (waitfor == MNT_WAIT) 1099 error = bwrite(bp); 1100 else 1101 bawrite(bp); 1102 } 1103 1104 if (!allerror && error) 1105 allerror = error; 1106 return (allerror); 1107} 1108/* 1109 * Return the root of a filesystem. 1110 */ 1111static int 1112ext2_root(struct mount *mp, int flags, struct vnode **vpp) 1113{ 1114 struct vnode *nvp; 1115 int error; 1116 1117 error = VFS_VGET(mp, EXT2_ROOTINO, LK_EXCLUSIVE, &nvp); 1118 if (error) 1119 return (error); 1120 *vpp = nvp; 1121 return (0); 1122} 1123