Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/ufs/ffs/ffs_vfsops.c
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1 /*- 2 * Copyright (c) 1989, 1991, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)ffs_vfsops.c 8.31 (Berkeley) 5/20/95 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD: releng/6.4/sys/ufs/ffs/ffs_vfsops.c 179071 2008-05-17 12:46:24Z kib $"); 34 35 #include "opt_mac.h" 36 #include "opt_quota.h" 37 #include "opt_ufs.h" 38 #include "opt_ffs.h" 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/namei.h> 43 #include <sys/proc.h> 44 #include <sys/kernel.h> 45 #include <sys/mac.h> 46 #include <sys/vnode.h> 47 #include <sys/mount.h> 48 #include <sys/bio.h> 49 #include <sys/buf.h> 50 #include <sys/conf.h> 51 #include <sys/fcntl.h> 52 #include <sys/malloc.h> 53 #include <sys/mutex.h> 54 55 #include <ufs/ufs/extattr.h> 56 #include <ufs/ufs/quota.h> 57 #include <ufs/ufs/ufsmount.h> 58 #include <ufs/ufs/inode.h> 59 #include <ufs/ufs/ufs_extern.h> 60 61 #include <ufs/ffs/fs.h> 62 #include <ufs/ffs/ffs_extern.h> 63 64 #include <vm/vm.h> 65 #include <vm/uma.h> 66 #include <vm/vm_page.h> 67 68 #include <geom/geom.h> 69 #include <geom/geom_vfs.h> 70 71 static uma_zone_t uma_inode, uma_ufs1, uma_ufs2; 72 73 static int ffs_sbupdate(struct ufsmount *, int, int); 74 static int ffs_reload(struct mount *, struct thread *); 75 static int ffs_mountfs(struct vnode *, struct mount *, struct thread *); 76 static void ffs_oldfscompat_read(struct fs *, struct ufsmount *, 77 ufs2_daddr_t); 78 static void ffs_oldfscompat_write(struct fs *, struct ufsmount *); 79 static void ffs_ifree(struct ufsmount *ump, struct inode *ip); 80 static vfs_init_t ffs_init; 81 static vfs_uninit_t ffs_uninit; 82 static vfs_extattrctl_t ffs_extattrctl; 83 static vfs_cmount_t ffs_cmount; 84 static vfs_unmount_t ffs_unmount; 85 static vfs_mount_t ffs_mount; 86 static vfs_statfs_t ffs_statfs; 87 static vfs_fhtovp_t ffs_fhtovp; 88 static vfs_vptofh_t ffs_vptofh; 89 static vfs_sync_t ffs_sync; 90 91 static struct vfsops ufs_vfsops = { 92 .vfs_extattrctl = ffs_extattrctl, 93 .vfs_fhtovp = ffs_fhtovp, 94 .vfs_init = ffs_init, 95 .vfs_mount = ffs_mount, 96 .vfs_cmount = ffs_cmount, 97 .vfs_quotactl = ufs_quotactl, 98 .vfs_root = ufs_root, 99 .vfs_statfs = ffs_statfs, 100 .vfs_sync = ffs_sync, 101 .vfs_uninit = ffs_uninit, 102 .vfs_unmount = ffs_unmount, 103 .vfs_vget = ffs_vget, 104 .vfs_vptofh = ffs_vptofh, 105 }; 106 107 VFS_SET(ufs_vfsops, ufs, 0); 108 MODULE_VERSION(ufs, 1); 109 110 static b_strategy_t ffs_geom_strategy; 111 static b_write_t ffs_bufwrite; 112 113 static struct buf_ops ffs_ops = { 114 .bop_name = "FFS", 115 .bop_write = ffs_bufwrite, 116 .bop_strategy = ffs_geom_strategy, 117 .bop_sync = bufsync, 118 #ifdef NO_FFS_SNAPSHOT 119 .bop_bdflush = bufbdflush, 120 #else 121 .bop_bdflush = ffs_bdflush, 122 #endif 123 }; 124 125 static const char *ffs_opts[] = { "acls", "async", "atime", "clusterr", 126 "clusterw", "exec", "export", "force", "from", "multilabel", 127 "snapshot", "suid", "suiddir", "symfollow", "sync", 128 "update", "union", NULL }; 129 130 static int 131 ffs_mount(struct mount *mp, struct thread *td) 132 { 133 struct vnode *devvp; 134 struct ufsmount *ump = 0; 135 struct fs *fs; 136 int error, flags; 137 mode_t accessmode; 138 struct nameidata ndp; 139 char *fspec; 140 141 if (vfs_filteropt(mp->mnt_optnew, ffs_opts)) 142 return (EINVAL); 143 if (uma_inode == NULL) { 144 uma_inode = uma_zcreate("FFS inode", 145 sizeof(struct inode), NULL, NULL, NULL, NULL, 146 UMA_ALIGN_PTR, 0); 147 uma_ufs1 = uma_zcreate("FFS1 dinode", 148 sizeof(struct ufs1_dinode), NULL, NULL, NULL, NULL, 149 UMA_ALIGN_PTR, 0); 150 uma_ufs2 = uma_zcreate("FFS2 dinode", 151 sizeof(struct ufs2_dinode), NULL, NULL, NULL, NULL, 152 UMA_ALIGN_PTR, 0); 153 } 154 155 fspec = vfs_getopts(mp->mnt_optnew, "from", &error); 156 if (error) 157 return (error); 158 159 /* 160 * If updating, check whether changing from read-only to 161 * read/write; if there is no device name, that's all we do. 162 */ 163 if (mp->mnt_flag & MNT_UPDATE) { 164 ump = VFSTOUFS(mp); 165 fs = ump->um_fs; 166 devvp = ump->um_devvp; 167 if (fs->fs_ronly == 0 && 168 vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) { 169 if ((error = vn_start_write(NULL, &mp, V_WAIT)) != 0) 170 return (error); 171 /* 172 * Flush any dirty data. 173 */ 174 if ((error = ffs_sync(mp, MNT_WAIT, td)) != 0) { 175 vn_finished_write(mp); 176 return (error); 177 } 178 /* 179 * Check for and optionally get rid of files open 180 * for writing. 181 */ 182 flags = WRITECLOSE; 183 if (mp->mnt_flag & MNT_FORCE) 184 flags |= FORCECLOSE; 185 if (mp->mnt_flag & MNT_SOFTDEP) { 186 error = softdep_flushfiles(mp, flags, td); 187 } else { 188 error = ffs_flushfiles(mp, flags, td); 189 } 190 if (error) { 191 vn_finished_write(mp); 192 return (error); 193 } 194 if (fs->fs_pendingblocks != 0 || 195 fs->fs_pendinginodes != 0) { 196 printf("%s: %s: blocks %jd files %d\n", 197 fs->fs_fsmnt, "update error", 198 (intmax_t)fs->fs_pendingblocks, 199 fs->fs_pendinginodes); 200 fs->fs_pendingblocks = 0; 201 fs->fs_pendinginodes = 0; 202 } 203 if ((fs->fs_flags & (FS_UNCLEAN | FS_NEEDSFSCK)) == 0) 204 fs->fs_clean = 1; 205 if ((error = ffs_sbupdate(ump, MNT_WAIT, 0)) != 0) { 206 fs->fs_ronly = 0; 207 fs->fs_clean = 0; 208 vn_finished_write(mp); 209 return (error); 210 } 211 vn_finished_write(mp); 212 DROP_GIANT(); 213 g_topology_lock(); 214 g_access(ump->um_cp, 0, -1, 0); 215 g_topology_unlock(); 216 PICKUP_GIANT(); 217 fs->fs_ronly = 1; 218 MNT_ILOCK(mp); 219 mp->mnt_flag |= MNT_RDONLY; 220 MNT_IUNLOCK(mp); 221 } 222 if ((mp->mnt_flag & MNT_RELOAD) && 223 (error = ffs_reload(mp, td)) != 0) 224 return (error); 225 if (fs->fs_ronly && 226 !vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) { 227 /* 228 * If upgrade to read-write by non-root, then verify 229 * that user has necessary permissions on the device. 230 */ 231 if (suser(td)) { 232 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 233 if ((error = VOP_ACCESS(devvp, VREAD | VWRITE, 234 td->td_ucred, td)) != 0) { 235 VOP_UNLOCK(devvp, 0, td); 236 return (error); 237 } 238 VOP_UNLOCK(devvp, 0, td); 239 } 240 fs->fs_flags &= ~FS_UNCLEAN; 241 if (fs->fs_clean == 0) { 242 fs->fs_flags |= FS_UNCLEAN; 243 if ((mp->mnt_flag & MNT_FORCE) || 244 ((fs->fs_flags & FS_NEEDSFSCK) == 0 && 245 (fs->fs_flags & FS_DOSOFTDEP))) { 246 printf("WARNING: %s was not %s\n", 247 fs->fs_fsmnt, "properly dismounted"); 248 } else { 249 printf( 250 "WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n", 251 fs->fs_fsmnt); 252 return (EPERM); 253 } 254 } 255 DROP_GIANT(); 256 g_topology_lock(); 257 /* 258 * If we're the root device, we may not have an E count 259 * yet, get it now. 260 */ 261 if (ump->um_cp->ace == 0) 262 error = g_access(ump->um_cp, 0, 1, 1); 263 else 264 error = g_access(ump->um_cp, 0, 1, 0); 265 g_topology_unlock(); 266 PICKUP_GIANT(); 267 if (error) 268 return (error); 269 if ((error = vn_start_write(NULL, &mp, V_WAIT)) != 0) 270 return (error); 271 fs->fs_ronly = 0; 272 MNT_ILOCK(mp); 273 mp->mnt_flag &= ~MNT_RDONLY; 274 MNT_IUNLOCK(mp); 275 fs->fs_clean = 0; 276 if ((error = ffs_sbupdate(ump, MNT_WAIT, 0)) != 0) { 277 vn_finished_write(mp); 278 return (error); 279 } 280 /* check to see if we need to start softdep */ 281 if ((fs->fs_flags & FS_DOSOFTDEP) && 282 (error = softdep_mount(devvp, mp, fs, td->td_ucred))){ 283 vn_finished_write(mp); 284 return (error); 285 } 286 if (fs->fs_snapinum[0] != 0) 287 ffs_snapshot_mount(mp); 288 vn_finished_write(mp); 289 } 290 /* 291 * Soft updates is incompatible with "async", 292 * so if we are doing softupdates stop the user 293 * from setting the async flag in an update. 294 * Softdep_mount() clears it in an initial mount 295 * or ro->rw remount. 296 */ 297 if (mp->mnt_flag & MNT_SOFTDEP) { 298 /* XXX: Reset too late ? */ 299 MNT_ILOCK(mp); 300 mp->mnt_flag &= ~MNT_ASYNC; 301 MNT_IUNLOCK(mp); 302 } 303 /* 304 * Keep MNT_ACLS flag if it is stored in superblock. 305 */ 306 if ((fs->fs_flags & FS_ACLS) != 0) { 307 /* XXX: Set too late ? */ 308 MNT_ILOCK(mp); 309 mp->mnt_flag |= MNT_ACLS; 310 MNT_IUNLOCK(mp); 311 } 312 313 /* 314 * If this is a snapshot request, take the snapshot. 315 */ 316 if (mp->mnt_flag & MNT_SNAPSHOT) 317 return (ffs_snapshot(mp, fspec)); 318 } 319 320 /* 321 * Not an update, or updating the name: look up the name 322 * and verify that it refers to a sensible disk device. 323 */ 324 NDINIT(&ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec, td); 325 if ((error = namei(&ndp)) != 0) 326 return (error); 327 NDFREE(&ndp, NDF_ONLY_PNBUF); 328 devvp = ndp.ni_vp; 329 if (!vn_isdisk(devvp, &error)) { 330 vput(devvp); 331 return (error); 332 } 333 334 /* 335 * If mount by non-root, then verify that user has necessary 336 * permissions on the device. 337 */ 338 if (suser(td)) { 339 accessmode = VREAD; 340 if ((mp->mnt_flag & MNT_RDONLY) == 0) 341 accessmode |= VWRITE; 342 if ((error = VOP_ACCESS(devvp, accessmode, td->td_ucred, td))!= 0){ 343 vput(devvp); 344 return (error); 345 } 346 } 347 348 if (mp->mnt_flag & MNT_UPDATE) { 349 /* 350 * Update only 351 * 352 * If it's not the same vnode, or at least the same device 353 * then it's not correct. 354 */ 355 356 if (devvp->v_rdev != ump->um_devvp->v_rdev) 357 error = EINVAL; /* needs translation */ 358 vput(devvp); 359 if (error) 360 return (error); 361 } else { 362 /* 363 * New mount 364 * 365 * We need the name for the mount point (also used for 366 * "last mounted on") copied in. If an error occurs, 367 * the mount point is discarded by the upper level code. 368 * Note that vfs_mount() populates f_mntonname for us. 369 */ 370 if ((error = ffs_mountfs(devvp, mp, td)) != 0) { 371 vrele(devvp); 372 return (error); 373 } 374 } 375 vfs_mountedfrom(mp, fspec); 376 return (0); 377 } 378 379 /* 380 * Compatibility with old mount system call. 381 */ 382 383 static int 384 ffs_cmount(struct mntarg *ma, void *data, int flags, struct thread *td) 385 { 386 struct ufs_args args; 387 int error; 388 389 if (data == NULL) 390 return (EINVAL); 391 error = copyin(data, &args, sizeof args); 392 if (error) 393 return (error); 394 395 ma = mount_argsu(ma, "from", args.fspec, MAXPATHLEN); 396 ma = mount_arg(ma, "export", &args.export, sizeof args.export); 397 error = kernel_mount(ma, flags); 398 399 return (error); 400 } 401 402 /* 403 * Reload all incore data for a filesystem (used after running fsck on 404 * the root filesystem and finding things to fix). The filesystem must 405 * be mounted read-only. 406 * 407 * Things to do to update the mount: 408 * 1) invalidate all cached meta-data. 409 * 2) re-read superblock from disk. 410 * 3) re-read summary information from disk. 411 * 4) invalidate all inactive vnodes. 412 * 5) invalidate all cached file data. 413 * 6) re-read inode data for all active vnodes. 414 */ 415 static int 416 ffs_reload(struct mount *mp, struct thread *td) 417 { 418 struct vnode *vp, *mvp, *devvp; 419 struct inode *ip; 420 void *space; 421 struct buf *bp; 422 struct fs *fs, *newfs; 423 struct ufsmount *ump; 424 ufs2_daddr_t sblockloc; 425 int i, blks, size, error; 426 int32_t *lp; 427 428 if ((mp->mnt_flag & MNT_RDONLY) == 0) 429 return (EINVAL); 430 ump = VFSTOUFS(mp); 431 /* 432 * Step 1: invalidate all cached meta-data. 433 */ 434 devvp = VFSTOUFS(mp)->um_devvp; 435 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 436 if (vinvalbuf(devvp, 0, td, 0, 0) != 0) 437 panic("ffs_reload: dirty1"); 438 VOP_UNLOCK(devvp, 0, td); 439 440 /* 441 * Step 2: re-read superblock from disk. 442 */ 443 fs = VFSTOUFS(mp)->um_fs; 444 if ((error = bread(devvp, btodb(fs->fs_sblockloc), fs->fs_sbsize, 445 NOCRED, &bp)) != 0) 446 return (error); 447 newfs = (struct fs *)bp->b_data; 448 if ((newfs->fs_magic != FS_UFS1_MAGIC && 449 newfs->fs_magic != FS_UFS2_MAGIC) || 450 newfs->fs_bsize > MAXBSIZE || 451 newfs->fs_bsize < sizeof(struct fs)) { 452 brelse(bp); 453 return (EIO); /* XXX needs translation */ 454 } 455 /* 456 * Copy pointer fields back into superblock before copying in XXX 457 * new superblock. These should really be in the ufsmount. XXX 458 * Note that important parameters (eg fs_ncg) are unchanged. 459 */ 460 newfs->fs_csp = fs->fs_csp; 461 newfs->fs_maxcluster = fs->fs_maxcluster; 462 newfs->fs_contigdirs = fs->fs_contigdirs; 463 newfs->fs_active = fs->fs_active; 464 /* The file system is still read-only. */ 465 newfs->fs_ronly = 1; 466 sblockloc = fs->fs_sblockloc; 467 bcopy(newfs, fs, (u_int)fs->fs_sbsize); 468 brelse(bp); 469 mp->mnt_maxsymlinklen = fs->fs_maxsymlinklen; 470 ffs_oldfscompat_read(fs, VFSTOUFS(mp), sblockloc); 471 UFS_LOCK(ump); 472 if (fs->fs_pendingblocks != 0 || fs->fs_pendinginodes != 0) { 473 printf("%s: reload pending error: blocks %jd files %d\n", 474 fs->fs_fsmnt, (intmax_t)fs->fs_pendingblocks, 475 fs->fs_pendinginodes); 476 fs->fs_pendingblocks = 0; 477 fs->fs_pendinginodes = 0; 478 } 479 UFS_UNLOCK(ump); 480 481 /* 482 * Step 3: re-read summary information from disk. 483 */ 484 blks = howmany(fs->fs_cssize, fs->fs_fsize); 485 space = fs->fs_csp; 486 for (i = 0; i < blks; i += fs->fs_frag) { 487 size = fs->fs_bsize; 488 if (i + fs->fs_frag > blks) 489 size = (blks - i) * fs->fs_fsize; 490 error = bread(devvp, fsbtodb(fs, fs->fs_csaddr + i), size, 491 NOCRED, &bp); 492 if (error) 493 return (error); 494 bcopy(bp->b_data, space, (u_int)size); 495 space = (char *)space + size; 496 brelse(bp); 497 } 498 /* 499 * We no longer know anything about clusters per cylinder group. 500 */ 501 if (fs->fs_contigsumsize > 0) { 502 lp = fs->fs_maxcluster; 503 for (i = 0; i < fs->fs_ncg; i++) 504 *lp++ = fs->fs_contigsumsize; 505 } 506 507 loop: 508 MNT_ILOCK(mp); 509 MNT_VNODE_FOREACH(vp, mp, mvp) { 510 VI_LOCK(vp); 511 if (vp->v_iflag & VI_DOOMED) { 512 VI_UNLOCK(vp); 513 continue; 514 } 515 MNT_IUNLOCK(mp); 516 /* 517 * Step 4: invalidate all cached file data. 518 */ 519 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) { 520 MNT_VNODE_FOREACH_ABORT(mp, mvp); 521 goto loop; 522 } 523 if (vinvalbuf(vp, 0, td, 0, 0)) 524 panic("ffs_reload: dirty2"); 525 /* 526 * Step 5: re-read inode data for all active vnodes. 527 */ 528 ip = VTOI(vp); 529 error = 530 bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), 531 (int)fs->fs_bsize, NOCRED, &bp); 532 if (error) { 533 VOP_UNLOCK(vp, 0, td); 534 vrele(vp); 535 MNT_VNODE_FOREACH_ABORT(mp, mvp); 536 return (error); 537 } 538 ffs_load_inode(bp, ip, fs, ip->i_number); 539 ip->i_effnlink = ip->i_nlink; 540 brelse(bp); 541 VOP_UNLOCK(vp, 0, td); 542 vrele(vp); 543 MNT_ILOCK(mp); 544 } 545 MNT_IUNLOCK(mp); 546 return (0); 547 } 548 549 /* 550 * Possible superblock locations ordered from most to least likely. 551 */ 552 static int sblock_try[] = SBLOCKSEARCH; 553 554 /* 555 * Common code for mount and mountroot 556 */ 557 static int 558 ffs_mountfs(devvp, mp, td) 559 struct vnode *devvp; 560 struct mount *mp; 561 struct thread *td; 562 { 563 struct ufsmount *ump; 564 struct buf *bp; 565 struct fs *fs; 566 struct cdev *dev; 567 void *space; 568 ufs2_daddr_t sblockloc; 569 int error, i, blks, size, ronly; 570 int32_t *lp; 571 struct ucred *cred; 572 struct g_consumer *cp; 573 struct mount *nmp; 574 575 dev = devvp->v_rdev; 576 cred = td ? td->td_ucred : NOCRED; 577 578 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 579 DROP_GIANT(); 580 g_topology_lock(); 581 error = g_vfs_open(devvp, &cp, "ffs", ronly ? 0 : 1); 582 583 /* 584 * If we are a root mount, drop the E flag so fsck can do its magic. 585 * We will pick it up again when we remount R/W. 586 */ 587 if (error == 0 && ronly && (mp->mnt_flag & MNT_ROOTFS)) 588 error = g_access(cp, 0, 0, -1); 589 g_topology_unlock(); 590 PICKUP_GIANT(); 591 VOP_UNLOCK(devvp, 0, td); 592 if (error) 593 return (error); 594 if (devvp->v_rdev->si_iosize_max != 0) 595 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max; 596 if (mp->mnt_iosize_max > MAXPHYS) 597 mp->mnt_iosize_max = MAXPHYS; 598 599 devvp->v_bufobj.bo_private = cp; 600 devvp->v_bufobj.bo_ops = &ffs_ops; 601 602 bp = NULL; 603 ump = NULL; 604 fs = NULL; 605 sblockloc = 0; 606 /* 607 * Try reading the superblock in each of its possible locations. 608 */ 609 for (i = 0; sblock_try[i] != -1; i++) { 610 if ((SBLOCKSIZE % cp->provider->sectorsize) != 0) { 611 error = EINVAL; 612 printf("Invalid sectorsize %d for superblock size %d\n", 613 cp->provider->sectorsize, SBLOCKSIZE); 614 goto out; 615 } 616 if ((error = bread(devvp, btodb(sblock_try[i]), SBLOCKSIZE, 617 cred, &bp)) != 0) 618 goto out; 619 fs = (struct fs *)bp->b_data; 620 sblockloc = sblock_try[i]; 621 if ((fs->fs_magic == FS_UFS1_MAGIC || 622 (fs->fs_magic == FS_UFS2_MAGIC && 623 (fs->fs_sblockloc == sblockloc || 624 (fs->fs_old_flags & FS_FLAGS_UPDATED) == 0))) && 625 fs->fs_bsize <= MAXBSIZE && 626 fs->fs_bsize >= sizeof(struct fs)) 627 break; 628 brelse(bp); 629 bp = NULL; 630 } 631 if (sblock_try[i] == -1) { 632 error = EINVAL; /* XXX needs translation */ 633 goto out; 634 } 635 fs->fs_fmod = 0; 636 fs->fs_flags &= ~FS_INDEXDIRS; /* no support for directory indicies */ 637 fs->fs_flags &= ~FS_UNCLEAN; 638 if (fs->fs_clean == 0) { 639 fs->fs_flags |= FS_UNCLEAN; 640 if (ronly || (mp->mnt_flag & MNT_FORCE) || 641 ((fs->fs_flags & FS_NEEDSFSCK) == 0 && 642 (fs->fs_flags & FS_DOSOFTDEP))) { 643 printf( 644 "WARNING: %s was not properly dismounted\n", 645 fs->fs_fsmnt); 646 } else { 647 printf( 648 "WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n", 649 fs->fs_fsmnt); 650 error = EPERM; 651 goto out; 652 } 653 if ((fs->fs_pendingblocks != 0 || fs->fs_pendinginodes != 0) && 654 (mp->mnt_flag & MNT_FORCE)) { 655 printf("%s: lost blocks %jd files %d\n", fs->fs_fsmnt, 656 (intmax_t)fs->fs_pendingblocks, 657 fs->fs_pendinginodes); 658 fs->fs_pendingblocks = 0; 659 fs->fs_pendinginodes = 0; 660 } 661 } 662 if (fs->fs_pendingblocks != 0 || fs->fs_pendinginodes != 0) { 663 printf("%s: mount pending error: blocks %jd files %d\n", 664 fs->fs_fsmnt, (intmax_t)fs->fs_pendingblocks, 665 fs->fs_pendinginodes); 666 fs->fs_pendingblocks = 0; 667 fs->fs_pendinginodes = 0; 668 } 669 ump = malloc(sizeof *ump, M_UFSMNT, M_WAITOK | M_ZERO); 670 ump->um_cp = cp; 671 ump->um_bo = &devvp->v_bufobj; 672 ump->um_fs = malloc((u_long)fs->fs_sbsize, M_UFSMNT, M_WAITOK); 673 if (fs->fs_magic == FS_UFS1_MAGIC) { 674 ump->um_fstype = UFS1; 675 ump->um_balloc = ffs_balloc_ufs1; 676 } else { 677 ump->um_fstype = UFS2; 678 ump->um_balloc = ffs_balloc_ufs2; 679 } 680 ump->um_blkatoff = ffs_blkatoff; 681 ump->um_truncate = ffs_truncate; 682 ump->um_update = ffs_update; 683 ump->um_valloc = ffs_valloc; 684 ump->um_vfree = ffs_vfree; 685 ump->um_ifree = ffs_ifree; 686 mtx_init(UFS_MTX(ump), "FFS", "FFS Lock", MTX_DEF); 687 bcopy(bp->b_data, ump->um_fs, (u_int)fs->fs_sbsize); 688 if (fs->fs_sbsize < SBLOCKSIZE) 689 bp->b_flags |= B_INVAL | B_NOCACHE; 690 brelse(bp); 691 bp = NULL; 692 fs = ump->um_fs; 693 ffs_oldfscompat_read(fs, ump, sblockloc); 694 fs->fs_ronly = ronly; 695 size = fs->fs_cssize; 696 blks = howmany(size, fs->fs_fsize); 697 if (fs->fs_contigsumsize > 0) 698 size += fs->fs_ncg * sizeof(int32_t); 699 size += fs->fs_ncg * sizeof(u_int8_t); 700 space = malloc((u_long)size, M_UFSMNT, M_WAITOK); 701 fs->fs_csp = space; 702 for (i = 0; i < blks; i += fs->fs_frag) { 703 size = fs->fs_bsize; 704 if (i + fs->fs_frag > blks) 705 size = (blks - i) * fs->fs_fsize; 706 if ((error = bread(devvp, fsbtodb(fs, fs->fs_csaddr + i), size, 707 cred, &bp)) != 0) { 708 free(fs->fs_csp, M_UFSMNT); 709 goto out; 710 } 711 bcopy(bp->b_data, space, (u_int)size); 712 space = (char *)space + size; 713 brelse(bp); 714 bp = NULL; 715 } 716 if (fs->fs_contigsumsize > 0) { 717 fs->fs_maxcluster = lp = space; 718 for (i = 0; i < fs->fs_ncg; i++) 719 *lp++ = fs->fs_contigsumsize; 720 space = lp; 721 } 722 size = fs->fs_ncg * sizeof(u_int8_t); 723 fs->fs_contigdirs = (u_int8_t *)space; 724 bzero(fs->fs_contigdirs, size); 725 fs->fs_active = NULL; 726 mp->mnt_data = (qaddr_t)ump; 727 mp->mnt_stat.f_fsid.val[0] = fs->fs_id[0]; 728 mp->mnt_stat.f_fsid.val[1] = fs->fs_id[1]; 729 nmp = NULL; 730 if (fs->fs_id[0] == 0 || fs->fs_id[1] == 0 || 731 (nmp = vfs_getvfs(&mp->mnt_stat.f_fsid))) { 732 if (nmp) 733 vfs_rel(nmp); 734 vfs_getnewfsid(mp); 735 } 736 mp->mnt_maxsymlinklen = fs->fs_maxsymlinklen; 737 MNT_ILOCK(mp); 738 mp->mnt_flag |= MNT_LOCAL; 739 MNT_IUNLOCK(mp); 740 if ((fs->fs_flags & FS_MULTILABEL) != 0) { 741 #ifdef MAC 742 MNT_ILOCK(mp); 743 mp->mnt_flag |= MNT_MULTILABEL; 744 MNT_IUNLOCK(mp); 745 #else 746 printf( 747 "WARNING: %s: multilabel flag on fs but no MAC support\n", 748 mp->mnt_stat.f_mntonname); 749 #endif 750 } 751 if ((fs->fs_flags & FS_ACLS) != 0) { 752 #ifdef UFS_ACL 753 MNT_ILOCK(mp); 754 mp->mnt_flag |= MNT_ACLS; 755 MNT_IUNLOCK(mp); 756 #else 757 printf( 758 "WARNING: %s: ACLs flag on fs but no ACLs support\n", 759 mp->mnt_stat.f_mntonname); 760 #endif 761 } 762 ump->um_mountp = mp; 763 ump->um_dev = dev; 764 ump->um_devvp = devvp; 765 ump->um_nindir = fs->fs_nindir; 766 ump->um_bptrtodb = fs->fs_fsbtodb; 767 ump->um_seqinc = fs->fs_frag; 768 for (i = 0; i < MAXQUOTAS; i++) 769 ump->um_quotas[i] = NULLVP; 770 #ifdef UFS_EXTATTR 771 ufs_extattr_uepm_init(&ump->um_extattr); 772 #endif 773 /* 774 * Set FS local "last mounted on" information (NULL pad) 775 */ 776 bzero(fs->fs_fsmnt, MAXMNTLEN); 777 strlcpy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MAXMNTLEN); 778 779 if( mp->mnt_flag & MNT_ROOTFS) { 780 /* 781 * Root mount; update timestamp in mount structure. 782 * this will be used by the common root mount code 783 * to update the system clock. 784 */ 785 mp->mnt_time = fs->fs_time; 786 } 787 788 if (ronly == 0) { 789 if ((fs->fs_flags & FS_DOSOFTDEP) && 790 (error = softdep_mount(devvp, mp, fs, cred)) != 0) { 791 free(fs->fs_csp, M_UFSMNT); 792 goto out; 793 } 794 if (fs->fs_snapinum[0] != 0) 795 ffs_snapshot_mount(mp); 796 fs->fs_fmod = 1; 797 fs->fs_clean = 0; 798 (void) ffs_sbupdate(ump, MNT_WAIT, 0); 799 } 800 /* 801 * Initialize filesystem stat information in mount struct. 802 */ 803 #ifdef UFS_EXTATTR 804 #ifdef UFS_EXTATTR_AUTOSTART 805 /* 806 * 807 * Auto-starting does the following: 808 * - check for /.attribute in the fs, and extattr_start if so 809 * - for each file in .attribute, enable that file with 810 * an attribute of the same name. 811 * Not clear how to report errors -- probably eat them. 812 * This would all happen while the filesystem was busy/not 813 * available, so would effectively be "atomic". 814 */ 815 (void) ufs_extattr_autostart(mp, td); 816 #endif /* !UFS_EXTATTR_AUTOSTART */ 817 #endif /* !UFS_EXTATTR */ 818 MNT_ILOCK(mp); 819 mp->mnt_kern_flag |= MNTK_MPSAFE; 820 MNT_IUNLOCK(mp); 821 return (0); 822 out: 823 if (bp) 824 brelse(bp); 825 if (cp != NULL) { 826 DROP_GIANT(); 827 g_topology_lock(); 828 g_vfs_close(cp, td); 829 g_topology_unlock(); 830 PICKUP_GIANT(); 831 } 832 if (ump) { 833 mtx_destroy(UFS_MTX(ump)); 834 free(ump->um_fs, M_UFSMNT); 835 free(ump, M_UFSMNT); 836 mp->mnt_data = (qaddr_t)0; 837 } 838 return (error); 839 } 840 841 #include <sys/sysctl.h> 842 static int bigcgs = 0; 843 SYSCTL_INT(_debug, OID_AUTO, bigcgs, CTLFLAG_RW, &bigcgs, 0, ""); 844 845 /* 846 * Sanity checks for loading old filesystem superblocks. 847 * See ffs_oldfscompat_write below for unwound actions. 848 * 849 * XXX - Parts get retired eventually. 850 * Unfortunately new bits get added. 851 */ 852 static void 853 ffs_oldfscompat_read(fs, ump, sblockloc) 854 struct fs *fs; 855 struct ufsmount *ump; 856 ufs2_daddr_t sblockloc; 857 { 858 off_t maxfilesize; 859 860 /* 861 * If not yet done, update fs_flags location and value of fs_sblockloc. 862 */ 863 if ((fs->fs_old_flags & FS_FLAGS_UPDATED) == 0) { 864 fs->fs_flags = fs->fs_old_flags; 865 fs->fs_old_flags |= FS_FLAGS_UPDATED; 866 fs->fs_sblockloc = sblockloc; 867 } 868 /* 869 * If not yet done, update UFS1 superblock with new wider fields. 870 */ 871 if (fs->fs_magic == FS_UFS1_MAGIC && fs->fs_maxbsize != fs->fs_bsize) { 872 fs->fs_maxbsize = fs->fs_bsize; 873 fs->fs_time = fs->fs_old_time; 874 fs->fs_size = fs->fs_old_size; 875 fs->fs_dsize = fs->fs_old_dsize; 876 fs->fs_csaddr = fs->fs_old_csaddr; 877 fs->fs_cstotal.cs_ndir = fs->fs_old_cstotal.cs_ndir; 878 fs->fs_cstotal.cs_nbfree = fs->fs_old_cstotal.cs_nbfree; 879 fs->fs_cstotal.cs_nifree = fs->fs_old_cstotal.cs_nifree; 880 fs->fs_cstotal.cs_nffree = fs->fs_old_cstotal.cs_nffree; 881 } 882 if (fs->fs_magic == FS_UFS1_MAGIC && 883 fs->fs_old_inodefmt < FS_44INODEFMT) { 884 fs->fs_maxfilesize = ((uint64_t)1 << 31) - 1; 885 fs->fs_qbmask = ~fs->fs_bmask; 886 fs->fs_qfmask = ~fs->fs_fmask; 887 } 888 if (fs->fs_magic == FS_UFS1_MAGIC) { 889 ump->um_savedmaxfilesize = fs->fs_maxfilesize; 890 maxfilesize = (uint64_t)0x80000000 * fs->fs_bsize - 1; 891 if (fs->fs_maxfilesize > maxfilesize) 892 fs->fs_maxfilesize = maxfilesize; 893 } 894 /* Compatibility for old filesystems */ 895 if (fs->fs_avgfilesize <= 0) 896 fs->fs_avgfilesize = AVFILESIZ; 897 if (fs->fs_avgfpdir <= 0) 898 fs->fs_avgfpdir = AFPDIR; 899 if (bigcgs) { 900 fs->fs_save_cgsize = fs->fs_cgsize; 901 fs->fs_cgsize = fs->fs_bsize; 902 } 903 } 904 905 /* 906 * Unwinding superblock updates for old filesystems. 907 * See ffs_oldfscompat_read above for details. 908 * 909 * XXX - Parts get retired eventually. 910 * Unfortunately new bits get added. 911 */ 912 static void 913 ffs_oldfscompat_write(fs, ump) 914 struct fs *fs; 915 struct ufsmount *ump; 916 { 917 918 /* 919 * Copy back UFS2 updated fields that UFS1 inspects. 920 */ 921 if (fs->fs_magic == FS_UFS1_MAGIC) { 922 fs->fs_old_time = fs->fs_time; 923 fs->fs_old_cstotal.cs_ndir = fs->fs_cstotal.cs_ndir; 924 fs->fs_old_cstotal.cs_nbfree = fs->fs_cstotal.cs_nbfree; 925 fs->fs_old_cstotal.cs_nifree = fs->fs_cstotal.cs_nifree; 926 fs->fs_old_cstotal.cs_nffree = fs->fs_cstotal.cs_nffree; 927 fs->fs_maxfilesize = ump->um_savedmaxfilesize; 928 } 929 if (bigcgs) { 930 fs->fs_cgsize = fs->fs_save_cgsize; 931 fs->fs_save_cgsize = 0; 932 } 933 } 934 935 /* 936 * unmount system call 937 */ 938 static int 939 ffs_unmount(mp, mntflags, td) 940 struct mount *mp; 941 int mntflags; 942 struct thread *td; 943 { 944 struct ufsmount *ump = VFSTOUFS(mp); 945 struct fs *fs; 946 int error, flags; 947 948 flags = 0; 949 if (mntflags & MNT_FORCE) { 950 flags |= FORCECLOSE; 951 } 952 #ifdef UFS_EXTATTR 953 if ((error = ufs_extattr_stop(mp, td))) { 954 if (error != EOPNOTSUPP) 955 printf("ffs_unmount: ufs_extattr_stop returned %d\n", 956 error); 957 } else { 958 ufs_extattr_uepm_destroy(&ump->um_extattr); 959 } 960 #endif 961 if (mp->mnt_flag & MNT_SOFTDEP) { 962 if ((error = softdep_flushfiles(mp, flags, td)) != 0) 963 return (error); 964 } else { 965 if ((error = ffs_flushfiles(mp, flags, td)) != 0) 966 return (error); 967 } 968 fs = ump->um_fs; 969 UFS_LOCK(ump); 970 if (fs->fs_pendingblocks != 0 || fs->fs_pendinginodes != 0) { 971 printf("%s: unmount pending error: blocks %jd files %d\n", 972 fs->fs_fsmnt, (intmax_t)fs->fs_pendingblocks, 973 fs->fs_pendinginodes); 974 fs->fs_pendingblocks = 0; 975 fs->fs_pendinginodes = 0; 976 } 977 UFS_UNLOCK(ump); 978 if (fs->fs_ronly == 0) { 979 fs->fs_clean = fs->fs_flags & (FS_UNCLEAN|FS_NEEDSFSCK) ? 0 : 1; 980 error = ffs_sbupdate(ump, MNT_WAIT, 0); 981 if (error) { 982 fs->fs_clean = 0; 983 return (error); 984 } 985 } 986 DROP_GIANT(); 987 g_topology_lock(); 988 g_vfs_close(ump->um_cp, td); 989 g_topology_unlock(); 990 PICKUP_GIANT(); 991 vrele(ump->um_devvp); 992 mtx_destroy(UFS_MTX(ump)); 993 free(fs->fs_csp, M_UFSMNT); 994 free(fs, M_UFSMNT); 995 free(ump, M_UFSMNT); 996 mp->mnt_data = (qaddr_t)0; 997 MNT_ILOCK(mp); 998 mp->mnt_flag &= ~MNT_LOCAL; 999 MNT_IUNLOCK(mp); 1000 return (error); 1001 } 1002 1003 /* 1004 * Flush out all the files in a filesystem. 1005 */ 1006 int 1007 ffs_flushfiles(mp, flags, td) 1008 struct mount *mp; 1009 int flags; 1010 struct thread *td; 1011 { 1012 struct ufsmount *ump; 1013 int error; 1014 1015 ump = VFSTOUFS(mp); 1016 #ifdef QUOTA 1017 if (mp->mnt_flag & MNT_QUOTA) { 1018 int i; 1019 error = vflush(mp, 0, SKIPSYSTEM|flags, td); 1020 if (error) 1021 return (error); 1022 for (i = 0; i < MAXQUOTAS; i++) { 1023 quotaoff(td, mp, i); 1024 } 1025 /* 1026 * Here we fall through to vflush again to ensure 1027 * that we have gotten rid of all the system vnodes. 1028 */ 1029 } 1030 #endif 1031 ASSERT_VOP_LOCKED(ump->um_devvp, "ffs_flushfiles"); 1032 if (ump->um_devvp->v_vflag & VV_COPYONWRITE) { 1033 if ((error = vflush(mp, 0, SKIPSYSTEM | flags, td)) != 0) 1034 return (error); 1035 ffs_snapshot_unmount(mp); 1036 flags |= FORCECLOSE; 1037 /* 1038 * Here we fall through to vflush again to ensure 1039 * that we have gotten rid of all the system vnodes. 1040 */ 1041 } 1042 /* 1043 * Flush all the files. 1044 */ 1045 if ((error = vflush(mp, 0, flags, td)) != 0) 1046 return (error); 1047 /* 1048 * Flush filesystem metadata. 1049 */ 1050 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY, td); 1051 error = VOP_FSYNC(ump->um_devvp, MNT_WAIT, td); 1052 VOP_UNLOCK(ump->um_devvp, 0, td); 1053 return (error); 1054 } 1055 1056 /* 1057 * Get filesystem statistics. 1058 */ 1059 static int 1060 ffs_statfs(mp, sbp, td) 1061 struct mount *mp; 1062 struct statfs *sbp; 1063 struct thread *td; 1064 { 1065 struct ufsmount *ump; 1066 struct fs *fs; 1067 1068 ump = VFSTOUFS(mp); 1069 fs = ump->um_fs; 1070 if (fs->fs_magic != FS_UFS1_MAGIC && fs->fs_magic != FS_UFS2_MAGIC) 1071 panic("ffs_statfs"); 1072 sbp->f_version = STATFS_VERSION; 1073 sbp->f_bsize = fs->fs_fsize; 1074 sbp->f_iosize = fs->fs_bsize; 1075 sbp->f_blocks = fs->fs_dsize; 1076 UFS_LOCK(ump); 1077 sbp->f_bfree = fs->fs_cstotal.cs_nbfree * fs->fs_frag + 1078 fs->fs_cstotal.cs_nffree + dbtofsb(fs, fs->fs_pendingblocks); 1079 sbp->f_bavail = freespace(fs, fs->fs_minfree) + 1080 dbtofsb(fs, fs->fs_pendingblocks); 1081 sbp->f_files = fs->fs_ncg * fs->fs_ipg - ROOTINO; 1082 sbp->f_ffree = fs->fs_cstotal.cs_nifree + fs->fs_pendinginodes; 1083 UFS_UNLOCK(ump); 1084 sbp->f_namemax = NAME_MAX; 1085 return (0); 1086 } 1087 1088 /* 1089 * Go through the disk queues to initiate sandbagged IO; 1090 * go through the inodes to write those that have been modified; 1091 * initiate the writing of the super block if it has been modified. 1092 * 1093 * Note: we are always called with the filesystem marked `MPBUSY'. 1094 */ 1095 static int 1096 ffs_sync(mp, waitfor, td) 1097 struct mount *mp; 1098 int waitfor; 1099 struct thread *td; 1100 { 1101 struct vnode *mvp, *vp, *devvp; 1102 struct inode *ip; 1103 struct ufsmount *ump = VFSTOUFS(mp); 1104 struct fs *fs; 1105 int error, count, wait, lockreq, allerror = 0; 1106 int suspend; 1107 int suspended; 1108 int secondary_writes; 1109 int secondary_accwrites; 1110 int softdep_deps; 1111 int softdep_accdeps; 1112 struct bufobj *bo; 1113 1114 fs = ump->um_fs; 1115 if (fs->fs_fmod != 0 && fs->fs_ronly != 0) { /* XXX */ 1116 printf("fs = %s\n", fs->fs_fsmnt); 1117 panic("ffs_sync: rofs mod"); 1118 } 1119 /* 1120 * Write back each (modified) inode. 1121 */ 1122 wait = 0; 1123 suspend = 0; 1124 suspended = 0; 1125 lockreq = LK_EXCLUSIVE | LK_NOWAIT; 1126 if (waitfor == MNT_SUSPEND) { 1127 suspend = 1; 1128 waitfor = MNT_WAIT; 1129 } 1130 if (waitfor == MNT_WAIT) { 1131 wait = 1; 1132 lockreq = LK_EXCLUSIVE; 1133 } 1134 lockreq |= LK_INTERLOCK | LK_SLEEPFAIL; 1135 MNT_ILOCK(mp); 1136 loop: 1137 /* Grab snapshot of secondary write counts */ 1138 secondary_writes = mp->mnt_secondary_writes; 1139 secondary_accwrites = mp->mnt_secondary_accwrites; 1140 1141 /* Grab snapshot of softdep dependency counts */ 1142 MNT_IUNLOCK(mp); 1143 softdep_get_depcounts(mp, &softdep_deps, &softdep_accdeps); 1144 MNT_ILOCK(mp); 1145 1146 MNT_VNODE_FOREACH(vp, mp, mvp) { 1147 /* 1148 * Depend on the mntvnode_slock to keep things stable enough 1149 * for a quick test. Since there might be hundreds of 1150 * thousands of vnodes, we cannot afford even a subroutine 1151 * call unless there's a good chance that we have work to do. 1152 */ 1153 VI_LOCK(vp); 1154 if (vp->v_iflag & VI_DOOMED) { 1155 VI_UNLOCK(vp); 1156 continue; 1157 } 1158 ip = VTOI(vp); 1159 if (vp->v_type == VNON || ((ip->i_flag & 1160 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 && 1161 vp->v_bufobj.bo_dirty.bv_cnt == 0)) { 1162 VI_UNLOCK(vp); 1163 continue; 1164 } 1165 MNT_IUNLOCK(mp); 1166 if ((error = vget(vp, lockreq, td)) != 0) { 1167 MNT_ILOCK(mp); 1168 if (error == ENOENT || error == ENOLCK) { 1169 MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp); 1170 goto loop; 1171 } 1172 continue; 1173 } 1174 if ((error = ffs_syncvnode(vp, waitfor)) != 0) 1175 allerror = error; 1176 vput(vp); 1177 MNT_ILOCK(mp); 1178 } 1179 MNT_IUNLOCK(mp); 1180 /* 1181 * Force stale filesystem control information to be flushed. 1182 */ 1183 if (waitfor == MNT_WAIT) { 1184 if ((error = softdep_flushworklist(ump->um_mountp, &count, td))) 1185 allerror = error; 1186 /* Flushed work items may create new vnodes to clean */ 1187 if (allerror == 0 && count) { 1188 MNT_ILOCK(mp); 1189 goto loop; 1190 } 1191 } 1192 #ifdef QUOTA 1193 qsync(mp); 1194 #endif 1195 devvp = ump->um_devvp; 1196 VI_LOCK(devvp); 1197 bo = &devvp->v_bufobj; 1198 if (waitfor != MNT_LAZY && 1199 (bo->bo_numoutput > 0 || bo->bo_dirty.bv_cnt > 0)) { 1200 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY | LK_INTERLOCK, td); 1201 if ((error = VOP_FSYNC(devvp, waitfor, td)) != 0) 1202 allerror = error; 1203 VOP_UNLOCK(devvp, 0, td); 1204 if (allerror == 0 && waitfor == MNT_WAIT) { 1205 MNT_ILOCK(mp); 1206 goto loop; 1207 } 1208 } else if (suspend != 0) { 1209 if (softdep_check_suspend(mp, 1210 devvp, 1211 softdep_deps, 1212 softdep_accdeps, 1213 secondary_writes, 1214 secondary_accwrites) != 0) 1215 goto loop; /* More work needed */ 1216 mtx_assert(MNT_MTX(mp), MA_OWNED); 1217 mp->mnt_kern_flag |= MNTK_SUSPEND2 | MNTK_SUSPENDED; 1218 MNT_IUNLOCK(mp); 1219 suspended = 1; 1220 } else 1221 VI_UNLOCK(devvp); 1222 /* 1223 * Write back modified superblock. 1224 */ 1225 if (fs->fs_fmod != 0 && 1226 (error = ffs_sbupdate(ump, waitfor, suspended)) != 0) 1227 allerror = error; 1228 return (allerror); 1229 } 1230 1231 int 1232 ffs_vget(mp, ino, flags, vpp) 1233 struct mount *mp; 1234 ino_t ino; 1235 int flags; 1236 struct vnode **vpp; 1237 { 1238 struct fs *fs; 1239 struct inode *ip; 1240 struct ufsmount *ump; 1241 struct buf *bp; 1242 struct vnode *vp; 1243 struct cdev *dev; 1244 int error; 1245 1246 error = vfs_hash_get(mp, ino, flags, curthread, vpp, NULL, NULL); 1247 if (error || *vpp != NULL) 1248 return (error); 1249 1250 /* 1251 * We must promote to an exclusive lock for vnode creation. This 1252 * can happen if lookup is passed LOCKSHARED. 1253 */ 1254 if ((flags & LK_TYPE_MASK) == LK_SHARED) { 1255 flags &= ~LK_TYPE_MASK; 1256 flags |= LK_EXCLUSIVE; 1257 } 1258 1259 /* 1260 * We do not lock vnode creation as it is believed to be too 1261 * expensive for such rare case as simultaneous creation of vnode 1262 * for same ino by different processes. We just allow them to race 1263 * and check later to decide who wins. Let the race begin! 1264 */ 1265 1266 ump = VFSTOUFS(mp); 1267 dev = ump->um_dev; 1268 fs = ump->um_fs; 1269 1270 /* 1271 * If this MALLOC() is performed after the getnewvnode() 1272 * it might block, leaving a vnode with a NULL v_data to be 1273 * found by ffs_sync() if a sync happens to fire right then, 1274 * which will cause a panic because ffs_sync() blindly 1275 * dereferences vp->v_data (as well it should). 1276 */ 1277 ip = uma_zalloc(uma_inode, M_WAITOK | M_ZERO); 1278 1279 /* Allocate a new vnode/inode. */ 1280 if (fs->fs_magic == FS_UFS1_MAGIC) 1281 error = getnewvnode("ufs", mp, &ffs_vnodeops1, &vp); 1282 else 1283 error = getnewvnode("ufs", mp, &ffs_vnodeops2, &vp); 1284 if (error) { 1285 *vpp = NULL; 1286 uma_zfree(uma_inode, ip); 1287 return (error); 1288 } 1289 /* 1290 * FFS supports recursive and shared locking. 1291 */ 1292 vp->v_vnlock->lk_flags |= LK_CANRECURSE; 1293 vp->v_vnlock->lk_flags &= ~LK_NOSHARE; 1294 vp->v_data = ip; 1295 vp->v_bufobj.bo_bsize = fs->fs_bsize; 1296 ip->i_vnode = vp; 1297 ip->i_ump = ump; 1298 ip->i_fs = fs; 1299 ip->i_dev = dev; 1300 ip->i_number = ino; 1301 #ifdef QUOTA 1302 { 1303 int i; 1304 for (i = 0; i < MAXQUOTAS; i++) 1305 ip->i_dquot[i] = NODQUOT; 1306 } 1307 #endif 1308 1309 error = vfs_hash_insert(vp, ino, flags, curthread, vpp, NULL, NULL); 1310 if (error || *vpp != NULL) 1311 return (error); 1312 1313 /* Read in the disk contents for the inode, copy into the inode. */ 1314 error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)), 1315 (int)fs->fs_bsize, NOCRED, &bp); 1316 if (error) { 1317 /* 1318 * The inode does not contain anything useful, so it would 1319 * be misleading to leave it on its hash chain. With mode 1320 * still zero, it will be unlinked and returned to the free 1321 * list by vput(). 1322 */ 1323 brelse(bp); 1324 vput(vp); 1325 *vpp = NULL; 1326 return (error); 1327 } 1328 if (ip->i_ump->um_fstype == UFS1) 1329 ip->i_din1 = uma_zalloc(uma_ufs1, M_WAITOK); 1330 else 1331 ip->i_din2 = uma_zalloc(uma_ufs2, M_WAITOK); 1332 ffs_load_inode(bp, ip, fs, ino); 1333 if (DOINGSOFTDEP(vp)) 1334 softdep_load_inodeblock(ip); 1335 else 1336 ip->i_effnlink = ip->i_nlink; 1337 bqrelse(bp); 1338 1339 /* 1340 * Initialize the vnode from the inode, check for aliases. 1341 * Note that the underlying vnode may have changed. 1342 */ 1343 if (ip->i_ump->um_fstype == UFS1) 1344 error = ufs_vinit(mp, &ffs_fifoops1, &vp); 1345 else 1346 error = ufs_vinit(mp, &ffs_fifoops2, &vp); 1347 if (error) { 1348 vput(vp); 1349 *vpp = NULL; 1350 return (error); 1351 } 1352 1353 /* 1354 * Finish inode initialization. 1355 */ 1356 1357 /* 1358 * Set up a generation number for this inode if it does not 1359 * already have one. This should only happen on old filesystems. 1360 */ 1361 if (ip->i_gen == 0) { 1362 ip->i_gen = arc4random() / 2 + 1; 1363 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 1364 ip->i_flag |= IN_MODIFIED; 1365 DIP_SET(ip, i_gen, ip->i_gen); 1366 } 1367 } 1368 /* 1369 * Ensure that uid and gid are correct. This is a temporary 1370 * fix until fsck has been changed to do the update. 1371 */ 1372 if (fs->fs_magic == FS_UFS1_MAGIC && /* XXX */ 1373 fs->fs_old_inodefmt < FS_44INODEFMT) { /* XXX */ 1374 ip->i_uid = ip->i_din1->di_ouid; /* XXX */ 1375 ip->i_gid = ip->i_din1->di_ogid; /* XXX */ 1376 } /* XXX */ 1377 1378 #ifdef MAC 1379 if ((mp->mnt_flag & MNT_MULTILABEL) && ip->i_mode) { 1380 /* 1381 * If this vnode is already allocated, and we're running 1382 * multi-label, attempt to perform a label association 1383 * from the extended attributes on the inode. 1384 */ 1385 error = mac_associate_vnode_extattr(mp, vp); 1386 if (error) { 1387 /* ufs_inactive will release ip->i_devvp ref. */ 1388 vput(vp); 1389 *vpp = NULL; 1390 return (error); 1391 } 1392 } 1393 #endif 1394 1395 *vpp = vp; 1396 return (0); 1397 } 1398 1399 /* 1400 * File handle to vnode 1401 * 1402 * Have to be really careful about stale file handles: 1403 * - check that the inode number is valid 1404 * - call ffs_vget() to get the locked inode 1405 * - check for an unallocated inode (i_mode == 0) 1406 * - check that the given client host has export rights and return 1407 * those rights via. exflagsp and credanonp 1408 */ 1409 static int 1410 ffs_fhtovp(mp, fhp, vpp) 1411 struct mount *mp; 1412 struct fid *fhp; 1413 struct vnode **vpp; 1414 { 1415 struct ufid *ufhp; 1416 struct fs *fs; 1417 1418 ufhp = (struct ufid *)fhp; 1419 fs = VFSTOUFS(mp)->um_fs; 1420 if (ufhp->ufid_ino < ROOTINO || 1421 ufhp->ufid_ino >= fs->fs_ncg * fs->fs_ipg) 1422 return (ESTALE); 1423 return (ufs_fhtovp(mp, ufhp, vpp)); 1424 } 1425 1426 /* 1427 * Vnode pointer to File handle 1428 */ 1429 /* ARGSUSED */ 1430 static int 1431 ffs_vptofh(vp, fhp) 1432 struct vnode *vp; 1433 struct fid *fhp; 1434 { 1435 struct inode *ip; 1436 struct ufid *ufhp; 1437 1438 ip = VTOI(vp); 1439 ufhp = (struct ufid *)fhp; 1440 ufhp->ufid_len = sizeof(struct ufid); 1441 ufhp->ufid_ino = ip->i_number; 1442 ufhp->ufid_gen = ip->i_gen; 1443 return (0); 1444 } 1445 1446 /* 1447 * Initialize the filesystem. 1448 */ 1449 static int 1450 ffs_init(vfsp) 1451 struct vfsconf *vfsp; 1452 { 1453 1454 softdep_initialize(); 1455 return (ufs_init(vfsp)); 1456 } 1457 1458 /* 1459 * Undo the work of ffs_init(). 1460 */ 1461 static int 1462 ffs_uninit(vfsp) 1463 struct vfsconf *vfsp; 1464 { 1465 int ret; 1466 1467 ret = ufs_uninit(vfsp); 1468 softdep_uninitialize(); 1469 return (ret); 1470 } 1471 1472 /* 1473 * Write a superblock and associated information back to disk. 1474 */ 1475 static int 1476 ffs_sbupdate(mp, waitfor, suspended) 1477 struct ufsmount *mp; 1478 int waitfor; 1479 int suspended; 1480 { 1481 struct fs *fs = mp->um_fs; 1482 struct buf *sbbp; 1483 struct buf *bp; 1484 int blks; 1485 void *space; 1486 int i, size, error, allerror = 0; 1487 1488 if (fs->fs_ronly == 1 && 1489 (mp->um_mountp->mnt_flag & (MNT_RDONLY | MNT_UPDATE)) != 1490 (MNT_RDONLY | MNT_UPDATE)) 1491 panic("ffs_sbupdate: write read-only filesystem"); 1492 /* 1493 * We use the superblock's buf to serialize calls to ffs_sbupdate(). 1494 */ 1495 sbbp = getblk(mp->um_devvp, btodb(fs->fs_sblockloc), (int)fs->fs_sbsize, 1496 0, 0, 0); 1497 /* 1498 * First write back the summary information. 1499 */ 1500 blks = howmany(fs->fs_cssize, fs->fs_fsize); 1501 space = fs->fs_csp; 1502 for (i = 0; i < blks; i += fs->fs_frag) { 1503 size = fs->fs_bsize; 1504 if (i + fs->fs_frag > blks) 1505 size = (blks - i) * fs->fs_fsize; 1506 bp = getblk(mp->um_devvp, fsbtodb(fs, fs->fs_csaddr + i), 1507 size, 0, 0, 0); 1508 bcopy(space, bp->b_data, (u_int)size); 1509 space = (char *)space + size; 1510 if (suspended) 1511 bp->b_flags |= B_VALIDSUSPWRT; 1512 if (waitfor != MNT_WAIT) 1513 bawrite(bp); 1514 else if ((error = bwrite(bp)) != 0) 1515 allerror = error; 1516 } 1517 /* 1518 * Now write back the superblock itself. If any errors occurred 1519 * up to this point, then fail so that the superblock avoids 1520 * being written out as clean. 1521 */ 1522 if (allerror) { 1523 brelse(sbbp); 1524 return (allerror); 1525 } 1526 bp = sbbp; 1527 if (fs->fs_magic == FS_UFS1_MAGIC && fs->fs_sblockloc != SBLOCK_UFS1 && 1528 (fs->fs_flags & FS_FLAGS_UPDATED) == 0) { 1529 printf("%s: correcting fs_sblockloc from %jd to %d\n", 1530 fs->fs_fsmnt, fs->fs_sblockloc, SBLOCK_UFS1); 1531 fs->fs_sblockloc = SBLOCK_UFS1; 1532 } 1533 if (fs->fs_magic == FS_UFS2_MAGIC && fs->fs_sblockloc != SBLOCK_UFS2 && 1534 (fs->fs_flags & FS_FLAGS_UPDATED) == 0) { 1535 printf("%s: correcting fs_sblockloc from %jd to %d\n", 1536 fs->fs_fsmnt, fs->fs_sblockloc, SBLOCK_UFS2); 1537 fs->fs_sblockloc = SBLOCK_UFS2; 1538 } 1539 fs->fs_fmod = 0; 1540 fs->fs_time = time_second; 1541 bcopy((caddr_t)fs, bp->b_data, (u_int)fs->fs_sbsize); 1542 ffs_oldfscompat_write((struct fs *)bp->b_data, mp); 1543 if (suspended) 1544 bp->b_flags |= B_VALIDSUSPWRT; 1545 if (waitfor != MNT_WAIT) 1546 bawrite(bp); 1547 else if ((error = bwrite(bp)) != 0) 1548 allerror = error; 1549 return (allerror); 1550 } 1551 1552 static int 1553 ffs_extattrctl(struct mount *mp, int cmd, struct vnode *filename_vp, 1554 int attrnamespace, const char *attrname, struct thread *td) 1555 { 1556 1557 #ifdef UFS_EXTATTR 1558 return (ufs_extattrctl(mp, cmd, filename_vp, attrnamespace, 1559 attrname, td)); 1560 #else 1561 return (vfs_stdextattrctl(mp, cmd, filename_vp, attrnamespace, 1562 attrname, td)); 1563 #endif 1564 } 1565 1566 static void 1567 ffs_ifree(struct ufsmount *ump, struct inode *ip) 1568 { 1569 1570 if (ump->um_fstype == UFS1 && ip->i_din1 != NULL) 1571 uma_zfree(uma_ufs1, ip->i_din1); 1572 else if (ip->i_din2 != NULL) 1573 uma_zfree(uma_ufs2, ip->i_din2); 1574 uma_zfree(uma_inode, ip); 1575 } 1576 1577 static int dobkgrdwrite = 1; 1578 SYSCTL_INT(_debug, OID_AUTO, dobkgrdwrite, CTLFLAG_RW, &dobkgrdwrite, 0, 1579 "Do background writes (honoring the BV_BKGRDWRITE flag)?"); 1580 1581 /* 1582 * Complete a background write started from bwrite. 1583 */ 1584 static void 1585 ffs_backgroundwritedone(struct buf *bp) 1586 { 1587 struct bufobj *bufobj; 1588 struct buf *origbp; 1589 1590 /* 1591 * Find the original buffer that we are writing. 1592 */ 1593 bufobj = bp->b_bufobj; 1594 BO_LOCK(bufobj); 1595 if ((origbp = gbincore(bp->b_bufobj, bp->b_lblkno)) == NULL) 1596 panic("backgroundwritedone: lost buffer"); 1597 /* Grab an extra reference to be dropped by the bufdone() below. */ 1598 bufobj_wrefl(bufobj); 1599 BO_UNLOCK(bufobj); 1600 /* 1601 * Process dependencies then return any unfinished ones. 1602 */ 1603 if (!LIST_EMPTY(&bp->b_dep)) 1604 buf_complete(bp); 1605 #ifdef SOFTUPDATES 1606 if (!LIST_EMPTY(&bp->b_dep)) 1607 softdep_move_dependencies(bp, origbp); 1608 #endif 1609 /* 1610 * This buffer is marked B_NOCACHE so when it is released 1611 * by biodone it will be tossed. 1612 */ 1613 bp->b_flags |= B_NOCACHE; 1614 bp->b_flags &= ~B_CACHE; 1615 bufdone(bp); 1616 BO_LOCK(bufobj); 1617 /* 1618 * Clear the BV_BKGRDINPROG flag in the original buffer 1619 * and awaken it if it is waiting for the write to complete. 1620 * If BV_BKGRDINPROG is not set in the original buffer it must 1621 * have been released and re-instantiated - which is not legal. 1622 */ 1623 KASSERT((origbp->b_vflags & BV_BKGRDINPROG), 1624 ("backgroundwritedone: lost buffer2")); 1625 origbp->b_vflags &= ~BV_BKGRDINPROG; 1626 if (origbp->b_vflags & BV_BKGRDWAIT) { 1627 origbp->b_vflags &= ~BV_BKGRDWAIT; 1628 wakeup(&origbp->b_xflags); 1629 } 1630 BO_UNLOCK(bufobj); 1631 } 1632 1633 1634 /* 1635 * Write, release buffer on completion. (Done by iodone 1636 * if async). Do not bother writing anything if the buffer 1637 * is invalid. 1638 * 1639 * Note that we set B_CACHE here, indicating that buffer is 1640 * fully valid and thus cacheable. This is true even of NFS 1641 * now so we set it generally. This could be set either here 1642 * or in biodone() since the I/O is synchronous. We put it 1643 * here. 1644 */ 1645 static int 1646 ffs_bufwrite(struct buf *bp) 1647 { 1648 int oldflags, s; 1649 struct buf *newbp; 1650 1651 CTR3(KTR_BUF, "bufwrite(%p) vp %p flags %X", bp, bp->b_vp, bp->b_flags); 1652 if (bp->b_flags & B_INVAL) { 1653 brelse(bp); 1654 return (0); 1655 } 1656 1657 oldflags = bp->b_flags; 1658 1659 if (BUF_REFCNT(bp) == 0) 1660 panic("bufwrite: buffer is not busy???"); 1661 s = splbio(); 1662 /* 1663 * If a background write is already in progress, delay 1664 * writing this block if it is asynchronous. Otherwise 1665 * wait for the background write to complete. 1666 */ 1667 BO_LOCK(bp->b_bufobj); 1668 if (bp->b_vflags & BV_BKGRDINPROG) { 1669 if (bp->b_flags & B_ASYNC) { 1670 BO_UNLOCK(bp->b_bufobj); 1671 splx(s); 1672 bdwrite(bp); 1673 return (0); 1674 } 1675 bp->b_vflags |= BV_BKGRDWAIT; 1676 msleep(&bp->b_xflags, BO_MTX(bp->b_bufobj), PRIBIO, "bwrbg", 0); 1677 if (bp->b_vflags & BV_BKGRDINPROG) 1678 panic("bufwrite: still writing"); 1679 } 1680 BO_UNLOCK(bp->b_bufobj); 1681 1682 /* Mark the buffer clean */ 1683 bundirty(bp); 1684 1685 /* 1686 * If this buffer is marked for background writing and we 1687 * do not have to wait for it, make a copy and write the 1688 * copy so as to leave this buffer ready for further use. 1689 * 1690 * This optimization eats a lot of memory. If we have a page 1691 * or buffer shortfall we can't do it. 1692 */ 1693 if (dobkgrdwrite && (bp->b_xflags & BX_BKGRDWRITE) && 1694 (bp->b_flags & B_ASYNC) && 1695 !vm_page_count_severe() && 1696 !buf_dirty_count_severe()) { 1697 KASSERT(bp->b_iodone == NULL, 1698 ("bufwrite: needs chained iodone (%p)", bp->b_iodone)); 1699 1700 /* get a new block */ 1701 newbp = geteblk(bp->b_bufsize); 1702 1703 /* 1704 * set it to be identical to the old block. We have to 1705 * set b_lblkno and BKGRDMARKER before calling bgetvp() 1706 * to avoid confusing the splay tree and gbincore(). 1707 */ 1708 memcpy(newbp->b_data, bp->b_data, bp->b_bufsize); 1709 newbp->b_lblkno = bp->b_lblkno; 1710 newbp->b_xflags |= BX_BKGRDMARKER; 1711 BO_LOCK(bp->b_bufobj); 1712 bp->b_vflags |= BV_BKGRDINPROG; 1713 bgetvp(bp->b_vp, newbp); 1714 BO_UNLOCK(bp->b_bufobj); 1715 newbp->b_bufobj = &bp->b_vp->v_bufobj; 1716 newbp->b_blkno = bp->b_blkno; 1717 newbp->b_offset = bp->b_offset; 1718 newbp->b_iodone = ffs_backgroundwritedone; 1719 newbp->b_flags |= B_ASYNC; 1720 newbp->b_flags &= ~B_INVAL; 1721 1722 #ifdef SOFTUPDATES 1723 /* move over the dependencies */ 1724 if (!LIST_EMPTY(&bp->b_dep)) 1725 softdep_move_dependencies(bp, newbp); 1726 #endif 1727 1728 /* 1729 * Initiate write on the copy, release the original to 1730 * the B_LOCKED queue so that it cannot go away until 1731 * the background write completes. If not locked it could go 1732 * away and then be reconstituted while it was being written. 1733 * If the reconstituted buffer were written, we could end up 1734 * with two background copies being written at the same time. 1735 */ 1736 bqrelse(bp); 1737 bp = newbp; 1738 } 1739 1740 /* Let the normal bufwrite do the rest for us */ 1741 return (bufwrite(bp)); 1742 } 1743 1744 1745 static void 1746 ffs_geom_strategy(struct bufobj *bo, struct buf *bp) 1747 { 1748 struct vnode *vp; 1749 int error; 1750 struct buf *tbp; 1751 1752 vp = bo->__bo_vnode; 1753 if (bp->b_iocmd == BIO_WRITE) { 1754 if ((bp->b_flags & B_VALIDSUSPWRT) == 0 && 1755 bp->b_vp != NULL && bp->b_vp->v_mount != NULL && 1756 (bp->b_vp->v_mount->mnt_kern_flag & MNTK_SUSPENDED) != 0) 1757 panic("ffs_geom_strategy: bad I/O"); 1758 bp->b_flags &= ~B_VALIDSUSPWRT; 1759 if ((vp->v_vflag & VV_COPYONWRITE) && 1760 vp->v_rdev->si_snapdata != NULL) { 1761 if ((bp->b_flags & B_CLUSTER) != 0) { 1762 runningbufwakeup(bp); 1763 TAILQ_FOREACH(tbp, &bp->b_cluster.cluster_head, 1764 b_cluster.cluster_entry) { 1765 error = ffs_copyonwrite(vp, tbp); 1766 if (error != 0 && 1767 error != EOPNOTSUPP) { 1768 bp->b_error = error; 1769 bp->b_ioflags |= BIO_ERROR; 1770 bufdone(bp); 1771 return; 1772 } 1773 } 1774 bp->b_runningbufspace = bp->b_bufsize; 1775 atomic_add_int(&runningbufspace, 1776 bp->b_runningbufspace); 1777 } else { 1778 error = ffs_copyonwrite(vp, bp); 1779 if (error != 0 && error != EOPNOTSUPP) { 1780 bp->b_error = error; 1781 bp->b_ioflags |= BIO_ERROR; 1782 bufdone(bp); 1783 return; 1784 } 1785 } 1786 } 1787 #ifdef SOFTUPDATES 1788 if ((bp->b_flags & B_CLUSTER) != 0) { 1789 TAILQ_FOREACH(tbp, &bp->b_cluster.cluster_head, 1790 b_cluster.cluster_entry) { 1791 if (!LIST_EMPTY(&tbp->b_dep)) 1792 buf_start(tbp); 1793 } 1794 } else { 1795 if (!LIST_EMPTY(&bp->b_dep)) 1796 buf_start(bp); 1797 } 1798 1799 #endif 1800 } 1801 g_vfs_strategy(bo, bp); 1802 }
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