ext2_vfsops.c revision 293866
1278193Sngie/*- 2278193Sngie * modified for EXT2FS support in Lites 1.1 3278193Sngie * 4278193Sngie * 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 293866 2016-01-14 01:50:06Z 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 EXT4F_RO_INCOMPAT_SUPP)) { 295 printf( 296"WARNING: mount of %s denied due to unsupported optional features\n", 297 devtoname(dev)); 298 return (1); 299 } 300 if (!ronly && 301 (es->e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP)) { 302 printf("WARNING: R/W mount of %s denied due to " 303 "unsupported optional features\n", devtoname(dev)); 304 return (1); 305 } 306 } 307 return (0); 308} 309 310/* 311 * This computes the fields of the ext2_sb_info structure from the 312 * data in the ext2_super_block structure read in. 313 */ 314static int 315compute_sb_data(struct vnode *devvp, struct ext2fs *es, 316 struct m_ext2fs *fs) 317{ 318 int db_count, error; 319 int i; 320 int logic_sb_block = 1; /* XXX for now */ 321 struct buf *bp; 322 uint32_t e2fs_descpb; 323 324 fs->e2fs_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->e2fs_log_bsize; 325 fs->e2fs_bsize = 1U << fs->e2fs_bshift; 326 fs->e2fs_fsbtodb = es->e2fs_log_bsize + 1; 327 fs->e2fs_qbmask = fs->e2fs_bsize - 1; 328 fs->e2fs_fsize = EXT2_MIN_FRAG_SIZE << es->e2fs_log_fsize; 329 if (fs->e2fs_fsize) 330 fs->e2fs_fpb = fs->e2fs_bsize / fs->e2fs_fsize; 331 fs->e2fs_bpg = es->e2fs_bpg; 332 fs->e2fs_fpg = es->e2fs_fpg; 333 fs->e2fs_ipg = es->e2fs_ipg; 334 if (es->e2fs_rev == E2FS_REV0) { 335 fs->e2fs_isize = E2FS_REV0_INODE_SIZE ; 336 } else { 337 fs->e2fs_isize = es->e2fs_inode_size; 338 339 /* 340 * Simple sanity check for superblock inode size value. 341 */ 342 if (EXT2_INODE_SIZE(fs) < E2FS_REV0_INODE_SIZE || 343 EXT2_INODE_SIZE(fs) > fs->e2fs_bsize || 344 (fs->e2fs_isize & (fs->e2fs_isize - 1)) != 0) { 345 printf("ext2fs: invalid inode size %d\n", 346 fs->e2fs_isize); 347 return (EIO); 348 } 349 } 350 /* Check for extra isize in big inodes. */ 351 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_EXTRA_ISIZE) && 352 EXT2_INODE_SIZE(fs) < sizeof(struct ext2fs_dinode)) { 353 printf("ext2fs: no space for extra inode timestamps\n"); 354 return (EINVAL); 355 } 356 357 fs->e2fs_ipb = fs->e2fs_bsize / EXT2_INODE_SIZE(fs); 358 fs->e2fs_itpg = fs->e2fs_ipg / fs->e2fs_ipb; 359 /* s_resuid / s_resgid ? */ 360 fs->e2fs_gcount = (es->e2fs_bcount - es->e2fs_first_dblock + 361 EXT2_BLOCKS_PER_GROUP(fs) - 1) / EXT2_BLOCKS_PER_GROUP(fs); 362 e2fs_descpb = fs->e2fs_bsize / sizeof(struct ext2_gd); 363 db_count = (fs->e2fs_gcount + e2fs_descpb - 1) / e2fs_descpb; 364 fs->e2fs_gdbcount = db_count; 365 fs->e2fs_gd = malloc(db_count * fs->e2fs_bsize, 366 M_EXT2MNT, M_WAITOK); 367 fs->e2fs_contigdirs = malloc(fs->e2fs_gcount * 368 sizeof(*fs->e2fs_contigdirs), M_EXT2MNT, M_WAITOK | M_ZERO); 369 370 /* 371 * Adjust logic_sb_block. 372 * Godmar thinks: if the blocksize is greater than 1024, then 373 * the superblock is logically part of block zero. 374 */ 375 if(fs->e2fs_bsize > SBSIZE) 376 logic_sb_block = 0; 377 for (i = 0; i < db_count; i++) { 378 error = bread(devvp , 379 fsbtodb(fs, logic_sb_block + i + 1 ), 380 fs->e2fs_bsize, NOCRED, &bp); 381 if (error) { 382 free(fs->e2fs_contigdirs, M_EXT2MNT); 383 free(fs->e2fs_gd, M_EXT2MNT); 384 brelse(bp); 385 return (error); 386 } 387 e2fs_cgload((struct ext2_gd *)bp->b_data, 388 &fs->e2fs_gd[ 389 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 390 fs->e2fs_bsize); 391 brelse(bp); 392 bp = NULL; 393 } 394 /* Initialization for the ext2 Orlov allocator variant. */ 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; 398 399 if (es->e2fs_rev == E2FS_REV0 || 400 !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_LARGEFILE)) 401 fs->e2fs_maxfilesize = 0x7fffffff; 402 else 403 fs->e2fs_maxfilesize = 0x7fffffffffffffff; 404 return (0); 405} 406 407/* 408 * Reload all incore data for a filesystem (used after running fsck on 409 * the root filesystem and finding things to fix). The filesystem must 410 * be mounted read-only. 411 * 412 * Things to do to update the mount: 413 * 1) invalidate all cached meta-data. 414 * 2) re-read superblock from disk. 415 * 3) invalidate all cluster summary information. 416 * 4) invalidate all inactive vnodes. 417 * 5) invalidate all cached file data. 418 * 6) re-read inode data for all active vnodes. 419 * XXX we are missing some steps, in particular # 3, this has to be reviewed. 420 */ 421static int 422ext2_reload(struct mount *mp, struct thread *td) 423{ 424 struct vnode *vp, *mvp, *devvp; 425 struct inode *ip; 426 struct buf *bp; 427 struct ext2fs *es; 428 struct m_ext2fs *fs; 429 struct csum *sump; 430 int error, i; 431 int32_t *lp; 432 433 if ((mp->mnt_flag & MNT_RDONLY) == 0) 434 return (EINVAL); 435 /* 436 * Step 1: invalidate all cached meta-data. 437 */ 438 devvp = VFSTOEXT2(mp)->um_devvp; 439 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 440 if (vinvalbuf(devvp, 0, 0, 0) != 0) 441 panic("ext2_reload: dirty1"); 442 VOP_UNLOCK(devvp, 0); 443 444 /* 445 * Step 2: re-read superblock from disk. 446 * constants have been adjusted for ext2 447 */ 448 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 449 return (error); 450 es = (struct ext2fs *)bp->b_data; 451 if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) { 452 brelse(bp); 453 return (EIO); /* XXX needs translation */ 454 } 455 fs = VFSTOEXT2(mp)->um_e2fs; 456 bcopy(bp->b_data, fs->e2fs, sizeof(struct ext2fs)); 457 458 if((error = compute_sb_data(devvp, es, fs)) != 0) { 459 brelse(bp); 460 return (error); 461 } 462#ifdef UNKLAR 463 if (fs->fs_sbsize < SBSIZE) 464 bp->b_flags |= B_INVAL; 465#endif 466 brelse(bp); 467 468 /* 469 * Step 3: invalidate all cluster summary information. 470 */ 471 if (fs->e2fs_contigsumsize > 0) { 472 lp = fs->e2fs_maxcluster; 473 sump = fs->e2fs_clustersum; 474 for (i = 0; i < fs->e2fs_gcount; i++, sump++) { 475 *lp++ = fs->e2fs_contigsumsize; 476 sump->cs_init = 0; 477 bzero(sump->cs_sum, fs->e2fs_contigsumsize + 1); 478 } 479 } 480 481loop: 482 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 483 /* 484 * Step 4: invalidate all cached file data. 485 */ 486 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) { 487 MNT_VNODE_FOREACH_ALL_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_ALL_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 } 511 return (0); 512} 513 514/* 515 * Common code for mount and mountroot. 516 */ 517static int 518ext2_mountfs(struct vnode *devvp, struct mount *mp) 519{ 520 struct ext2mount *ump; 521 struct buf *bp; 522 struct m_ext2fs *fs; 523 struct ext2fs *es; 524 struct cdev *dev = devvp->v_rdev; 525 struct g_consumer *cp; 526 struct bufobj *bo; 527 struct csum *sump; 528 int error; 529 int ronly; 530 int i, size; 531 int32_t *lp; 532 int32_t e2fs_maxcontig; 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 | M_ZERO); 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 e2fs_maxcontig = MAX(1, MAXPHYS / ump->um_e2fs->e2fs_bsize); 608 ump->um_e2fs->e2fs_contigsumsize = MIN(e2fs_maxcontig, EXT2_MAXCONTIG); 609 if (ump->um_e2fs->e2fs_contigsumsize > 0) { 610 size = ump->um_e2fs->e2fs_gcount * sizeof(int32_t); 611 ump->um_e2fs->e2fs_maxcluster = malloc(size, M_EXT2MNT, M_WAITOK); 612 size = ump->um_e2fs->e2fs_gcount * sizeof(struct csum); 613 ump->um_e2fs->e2fs_clustersum = malloc(size, M_EXT2MNT, M_WAITOK); 614 lp = ump->um_e2fs->e2fs_maxcluster; 615 sump = ump->um_e2fs->e2fs_clustersum; 616 for (i = 0; i < ump->um_e2fs->e2fs_gcount; i++, sump++) { 617 *lp++ = ump->um_e2fs->e2fs_contigsumsize; 618 sump->cs_init = 0; 619 sump->cs_sum = malloc((ump->um_e2fs->e2fs_contigsumsize + 1) * 620 sizeof(int32_t), M_EXT2MNT, M_WAITOK | M_ZERO); 621 } 622 } 623 624 brelse(bp); 625 bp = NULL; 626 fs = ump->um_e2fs; 627 fs->e2fs_ronly = ronly; /* ronly is set according to mnt_flags */ 628 629 /* 630 * If the fs is not mounted read-only, make sure the super block is 631 * always written back on a sync(). 632 */ 633 fs->e2fs_wasvalid = fs->e2fs->e2fs_state & E2FS_ISCLEAN ? 1 : 0; 634 if (ronly == 0) { 635 fs->e2fs_fmod = 1; /* mark it modified */ 636 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN; /* set fs invalid */ 637 } 638 mp->mnt_data = ump; 639 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 640 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 641 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN; 642 MNT_ILOCK(mp); 643 mp->mnt_flag |= MNT_LOCAL; 644 MNT_IUNLOCK(mp); 645 ump->um_mountp = mp; 646 ump->um_dev = dev; 647 ump->um_devvp = devvp; 648 ump->um_bo = &devvp->v_bufobj; 649 ump->um_cp = cp; 650 651 /* 652 * Setting those two parameters allowed us to use 653 * ufs_bmap w/o changse! 654 */ 655 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs); 656 ump->um_bptrtodb = fs->e2fs->e2fs_log_bsize + 1; 657 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs); 658 if (ronly == 0) 659 ext2_sbupdate(ump, MNT_WAIT); 660 /* 661 * Initialize filesystem stat information in mount struct. 662 */ 663 MNT_ILOCK(mp); 664 mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED | 665 MNTK_USES_BCACHE; 666 MNT_IUNLOCK(mp); 667 return (0); 668out: 669 if (bp) 670 brelse(bp); 671 if (cp != NULL) { 672 DROP_GIANT(); 673 g_topology_lock(); 674 g_vfs_close(cp); 675 g_topology_unlock(); 676 PICKUP_GIANT(); 677 } 678 if (ump) { 679 mtx_destroy(EXT2_MTX(ump)); 680 free(ump->um_e2fs->e2fs_gd, M_EXT2MNT); 681 free(ump->um_e2fs->e2fs_contigdirs, M_EXT2MNT); 682 free(ump->um_e2fs->e2fs, M_EXT2MNT); 683 free(ump->um_e2fs, M_EXT2MNT); 684 free(ump, M_EXT2MNT); 685 mp->mnt_data = NULL; 686 } 687 return (error); 688} 689 690/* 691 * Unmount system call. 692 */ 693static int 694ext2_unmount(struct mount *mp, int mntflags) 695{ 696 struct ext2mount *ump; 697 struct m_ext2fs *fs; 698 struct csum *sump; 699 int error, flags, i, ronly; 700 701 flags = 0; 702 if (mntflags & MNT_FORCE) { 703 if (mp->mnt_flag & MNT_ROOTFS) 704 return (EINVAL); 705 flags |= FORCECLOSE; 706 } 707 if ((error = ext2_flushfiles(mp, flags, curthread)) != 0) 708 return (error); 709 ump = VFSTOEXT2(mp); 710 fs = ump->um_e2fs; 711 ronly = fs->e2fs_ronly; 712 if (ronly == 0 && ext2_cgupdate(ump, MNT_WAIT) == 0) { 713 if (fs->e2fs_wasvalid) 714 fs->e2fs->e2fs_state |= E2FS_ISCLEAN; 715 ext2_sbupdate(ump, MNT_WAIT); 716 } 717 718 DROP_GIANT(); 719 g_topology_lock(); 720 g_vfs_close(ump->um_cp); 721 g_topology_unlock(); 722 PICKUP_GIANT(); 723 vrele(ump->um_devvp); 724 sump = fs->e2fs_clustersum; 725 for (i = 0; i < fs->e2fs_gcount; i++, sump++) 726 free(sump->cs_sum, M_EXT2MNT); 727 free(fs->e2fs_clustersum, M_EXT2MNT); 728 free(fs->e2fs_maxcluster, M_EXT2MNT); 729 free(fs->e2fs_gd, M_EXT2MNT); 730 free(fs->e2fs_contigdirs, M_EXT2MNT); 731 free(fs->e2fs, M_EXT2MNT); 732 free(fs, M_EXT2MNT); 733 free(ump, M_EXT2MNT); 734 mp->mnt_data = NULL; 735 MNT_ILOCK(mp); 736 mp->mnt_flag &= ~MNT_LOCAL; 737 MNT_IUNLOCK(mp); 738 return (error); 739} 740 741/* 742 * Flush out all the files in a filesystem. 743 */ 744static int 745ext2_flushfiles(struct mount *mp, int flags, struct thread *td) 746{ 747 int error; 748 749 error = vflush(mp, 0, flags, td); 750 return (error); 751} 752/* 753 * Get filesystem statistics. 754 */ 755int 756ext2_statfs(struct mount *mp, struct statfs *sbp) 757{ 758 struct ext2mount *ump; 759 struct m_ext2fs *fs; 760 uint32_t overhead, overhead_per_group, ngdb; 761 int i, ngroups; 762 763 ump = VFSTOEXT2(mp); 764 fs = ump->um_e2fs; 765 if (fs->e2fs->e2fs_magic != E2FS_MAGIC) 766 panic("ext2_statfs"); 767 768 /* 769 * Compute the overhead (FS structures) 770 */ 771 overhead_per_group = 772 1 /* block bitmap */ + 773 1 /* inode bitmap */ + 774 fs->e2fs_itpg; 775 overhead = fs->e2fs->e2fs_first_dblock + 776 fs->e2fs_gcount * overhead_per_group; 777 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 778 fs->e2fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) { 779 for (i = 0, ngroups = 0; i < fs->e2fs_gcount; i++) { 780 if (cg_has_sb(i)) 781 ngroups++; 782 } 783 } else { 784 ngroups = fs->e2fs_gcount; 785 } 786 ngdb = fs->e2fs_gdbcount; 787 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 788 fs->e2fs->e2fs_features_compat & EXT2F_COMPAT_RESIZE) 789 ngdb += fs->e2fs->e2fs_reserved_ngdb; 790 overhead += ngroups * (1 /* superblock */ + ngdb); 791 792 sbp->f_bsize = EXT2_FRAG_SIZE(fs); 793 sbp->f_iosize = EXT2_BLOCK_SIZE(fs); 794 sbp->f_blocks = fs->e2fs->e2fs_bcount - overhead; 795 sbp->f_bfree = fs->e2fs->e2fs_fbcount; 796 sbp->f_bavail = sbp->f_bfree - fs->e2fs->e2fs_rbcount; 797 sbp->f_files = fs->e2fs->e2fs_icount; 798 sbp->f_ffree = fs->e2fs->e2fs_ficount; 799 return (0); 800} 801 802/* 803 * Go through the disk queues to initiate sandbagged IO; 804 * go through the inodes to write those that have been modified; 805 * initiate the writing of the super block if it has been modified. 806 * 807 * Note: we are always called with the filesystem marked `MPBUSY'. 808 */ 809static int 810ext2_sync(struct mount *mp, int waitfor) 811{ 812 struct vnode *mvp, *vp; 813 struct thread *td; 814 struct inode *ip; 815 struct ext2mount *ump = VFSTOEXT2(mp); 816 struct m_ext2fs *fs; 817 int error, allerror = 0; 818 819 td = curthread; 820 fs = ump->um_e2fs; 821 if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) { /* XXX */ 822 printf("fs = %s\n", fs->e2fs_fsmnt); 823 panic("ext2_sync: rofs mod"); 824 } 825 826 /* 827 * Write back each (modified) inode. 828 */ 829loop: 830 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 831 if (vp->v_type == VNON) { 832 VI_UNLOCK(vp); 833 continue; 834 } 835 ip = VTOI(vp); 836 if ((ip->i_flag & 837 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 && 838 (vp->v_bufobj.bo_dirty.bv_cnt == 0 || 839 waitfor == MNT_LAZY)) { 840 VI_UNLOCK(vp); 841 continue; 842 } 843 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 844 if (error) { 845 if (error == ENOENT) { 846 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 847 goto loop; 848 } 849 continue; 850 } 851 if ((error = VOP_FSYNC(vp, waitfor, td)) != 0) 852 allerror = error; 853 VOP_UNLOCK(vp, 0); 854 vrele(vp); 855 } 856 857 /* 858 * Force stale filesystem control information to be flushed. 859 */ 860 if (waitfor != MNT_LAZY) { 861 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); 862 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0) 863 allerror = error; 864 VOP_UNLOCK(ump->um_devvp, 0); 865 } 866 867 /* 868 * Write back modified superblock. 869 */ 870 if (fs->e2fs_fmod != 0) { 871 fs->e2fs_fmod = 0; 872 fs->e2fs->e2fs_wtime = time_second; 873 if ((error = ext2_cgupdate(ump, waitfor)) != 0) 874 allerror = error; 875 } 876 return (allerror); 877} 878 879/* 880 * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it 881 * in from disk. If it is in core, wait for the lock bit to clear, then 882 * return the inode locked. Detection and handling of mount points must be 883 * done by the calling routine. 884 */ 885static int 886ext2_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp) 887{ 888 struct m_ext2fs *fs; 889 struct inode *ip; 890 struct ext2mount *ump; 891 struct buf *bp; 892 struct vnode *vp; 893 struct thread *td; 894 int i, error; 895 int used_blocks; 896 897 td = curthread; 898 error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL); 899 if (error || *vpp != NULL) 900 return (error); 901 902 ump = VFSTOEXT2(mp); 903 ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO); 904 905 /* Allocate a new vnode/inode. */ 906 if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) { 907 *vpp = NULL; 908 free(ip, M_EXT2NODE); 909 return (error); 910 } 911 vp->v_data = ip; 912 ip->i_vnode = vp; 913 ip->i_e2fs = fs = ump->um_e2fs; 914 ip->i_ump = ump; 915 ip->i_number = ino; 916 917 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL); 918 error = insmntque(vp, mp); 919 if (error != 0) { 920 free(ip, M_EXT2NODE); 921 *vpp = NULL; 922 return (error); 923 } 924 error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL); 925 if (error || *vpp != NULL) 926 return (error); 927 928 /* Read in the disk contents for the inode, copy into the inode. */ 929 if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)), 930 (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) { 931 /* 932 * The inode does not contain anything useful, so it would 933 * be misleading to leave it on its hash chain. With mode 934 * still zero, it will be unlinked and returned to the free 935 * list by vput(). 936 */ 937 brelse(bp); 938 vput(vp); 939 *vpp = NULL; 940 return (error); 941 } 942 /* convert ext2 inode to dinode */ 943 ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data + EXT2_INODE_SIZE(fs) * 944 ino_to_fsbo(fs, ino)), ip); 945 ip->i_block_group = ino_to_cg(fs, ino); 946 ip->i_next_alloc_block = 0; 947 ip->i_next_alloc_goal = 0; 948 949 /* 950 * Now we want to make sure that block pointers for unused 951 * blocks are zeroed out - ext2_balloc depends on this 952 * although for regular files and directories only 953 * 954 * If IN_E4EXTENTS is enabled, unused blocks are not zeroed 955 * out because we could corrupt the extent tree. 956 */ 957 if (!(ip->i_flag & IN_E4EXTENTS) && 958 (S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode))) { 959 used_blocks = (ip->i_size+fs->e2fs_bsize-1) / fs->e2fs_bsize; 960 for (i = used_blocks; i < EXT2_NDIR_BLOCKS; i++) 961 ip->i_db[i] = 0; 962 } 963#ifdef EXT2FS_DEBUG 964 ext2_print_inode(ip); 965#endif 966 bqrelse(bp); 967 968 /* 969 * Initialize the vnode from the inode, check for aliases. 970 * Note that the underlying vnode may have changed. 971 */ 972 if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) { 973 vput(vp); 974 *vpp = NULL; 975 return (error); 976 } 977 978 /* 979 * Finish inode initialization. 980 */ 981 982 /* 983 * Set up a generation number for this inode if it does not 984 * already have one. This should only happen on old filesystems. 985 */ 986 if (ip->i_gen == 0) { 987 ip->i_gen = random() + 1; 988 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) 989 ip->i_flag |= IN_MODIFIED; 990 } 991 *vpp = vp; 992 return (0); 993} 994 995/* 996 * File handle to vnode 997 * 998 * Have to be really careful about stale file handles: 999 * - check that the inode number is valid 1000 * - call ext2_vget() to get the locked inode 1001 * - check for an unallocated inode (i_mode == 0) 1002 * - check that the given client host has export rights and return 1003 * those rights via. exflagsp and credanonp 1004 */ 1005static int 1006ext2_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp) 1007{ 1008 struct inode *ip; 1009 struct ufid *ufhp; 1010 struct vnode *nvp; 1011 struct m_ext2fs *fs; 1012 int error; 1013 1014 ufhp = (struct ufid *)fhp; 1015 fs = VFSTOEXT2(mp)->um_e2fs; 1016 if (ufhp->ufid_ino < EXT2_ROOTINO || 1017 ufhp->ufid_ino > fs->e2fs_gcount * fs->e2fs->e2fs_ipg) 1018 return (ESTALE); 1019 1020 error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp); 1021 if (error) { 1022 *vpp = NULLVP; 1023 return (error); 1024 } 1025 ip = VTOI(nvp); 1026 if (ip->i_mode == 0 || 1027 ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) { 1028 vput(nvp); 1029 *vpp = NULLVP; 1030 return (ESTALE); 1031 } 1032 *vpp = nvp; 1033 vnode_create_vobject(*vpp, 0, curthread); 1034 return (0); 1035} 1036 1037/* 1038 * Write a superblock and associated information back to disk. 1039 */ 1040static int 1041ext2_sbupdate(struct ext2mount *mp, int waitfor) 1042{ 1043 struct m_ext2fs *fs = mp->um_e2fs; 1044 struct ext2fs *es = fs->e2fs; 1045 struct buf *bp; 1046 int error = 0; 1047 1048 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0, 0); 1049 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2fs)); 1050 if (waitfor == MNT_WAIT) 1051 error = bwrite(bp); 1052 else 1053 bawrite(bp); 1054 1055 /* 1056 * The buffers for group descriptors, inode bitmaps and block bitmaps 1057 * are not busy at this point and are (hopefully) written by the 1058 * usual sync mechanism. No need to write them here. 1059 */ 1060 return (error); 1061} 1062int 1063ext2_cgupdate(struct ext2mount *mp, int waitfor) 1064{ 1065 struct m_ext2fs *fs = mp->um_e2fs; 1066 struct buf *bp; 1067 int i, error = 0, allerror = 0; 1068 1069 allerror = ext2_sbupdate(mp, waitfor); 1070 for (i = 0; i < fs->e2fs_gdbcount; i++) { 1071 bp = getblk(mp->um_devvp, fsbtodb(fs, 1072 fs->e2fs->e2fs_first_dblock + 1073 1 /* superblock */ + i), fs->e2fs_bsize, 0, 0, 0); 1074 e2fs_cgsave(&fs->e2fs_gd[ 1075 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 1076 (struct ext2_gd *)bp->b_data, fs->e2fs_bsize); 1077 if (waitfor == MNT_WAIT) 1078 error = bwrite(bp); 1079 else 1080 bawrite(bp); 1081 } 1082 1083 if (!allerror && error) 1084 allerror = error; 1085 return (allerror); 1086} 1087/* 1088 * Return the root of a filesystem. 1089 */ 1090static int 1091ext2_root(struct mount *mp, int flags, struct vnode **vpp) 1092{ 1093 struct vnode *nvp; 1094 int error; 1095 1096 error = VFS_VGET(mp, EXT2_ROOTINO, LK_EXCLUSIVE, &nvp); 1097 if (error) 1098 return (error); 1099 *vpp = nvp; 1100 return (0); 1101} 1102